drivers/net/bonding/bond_main.c

   1 /*
   2  * originally based on the dummy device.
   3  *
   4  * Copyright 1999, Thomas Davis, tadavis@lbl.gov.
   5  * Licensed under the GPL. Based on dummy.c, and eql.c devices.
   6  *
   7  * bonding.c: an Ethernet Bonding driver
   8  *
   9  * This is useful to talk to a Cisco EtherChannel compatible equipment:
  10  *      Cisco 5500
  11  *      Sun Trunking (Solaris)
  12  *      Alteon AceDirector Trunks
  13  *      Linux Bonding
  14  *      and probably many L2 switches ...
  15  *
  16  * How it works:
  17  *    ifconfig bond0 ipaddress netmask up
  18  *      will setup a network device, with an ip address.  No mac address
  19  *      will be assigned at this time.  The hw mac address will come from
  20  *      the first slave bonded to the channel.  All slaves will then use
  21  *      this hw mac address.
  22  *
  23  *    ifconfig bond0 down
  24  *         will release all slaves, marking them as down.
  25  *
  26  *    ifenslave bond0 eth0
  27  *      will attach eth0 to bond0 as a slave.  eth0 hw mac address will either
  28  *      a: be used as initial mac address
  29  *      b: if a hw mac address already is there, eth0's hw mac address
  30  *         will then be set from bond0.
  31  *
  32  */
  33
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/fcntl.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/ioport.h>
  41 #include <linux/in.h>
  42 #include <net/ip.h>
  43 #include <linux/ip.h>
  44 #include <linux/tcp.h>
  45 #include <linux/udp.h>
  46 #include <linux/slab.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/socket.h>
  51 #include <linux/ctype.h>
  52 #include <linux/inet.h>
  53 #include <linux/bitops.h>
  54 #include <linux/io.h>
  55 #include <asm/dma.h>
  56 #include <linux/uaccess.h>
  57 #include <linux/errno.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/inetdevice.h>
  60 #include <linux/igmp.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/skbuff.h>
  63 #include <net/sock.h>
  64 #include <linux/rtnetlink.h>
  65 #include <linux/smp.h>
  66 #include <linux/if_ether.h>
  67 #include <net/arp.h>
  68 #include <linux/mii.h>
  69 #include <linux/ethtool.h>
  70 #include <linux/if_vlan.h>
  71 #include <linux/if_bonding.h>
  72 #include <linux/jiffies.h>
  73 #include <linux/preempt.h>
  74 #include <net/route.h>
  75 #include <net/net_namespace.h>
  76 #include <net/netns/generic.h>
  77 #include <net/pkt_sched.h>
  78 #include <linux/rculist.h>
  79 #include <net/flow_keys.h>
  80 #include "bonding.h"
  81 #include "bond_3ad.h"
  82 #include "bond_alb.h"
  83
  84 /*---------------------------- Module parameters ----------------------------*/
  85
  86 /* monitor all links that often (in milliseconds). <=0 disables monitoring */
  87
  88 static int max_bonds    = BOND_DEFAULT_MAX_BONDS;
  89 static int tx_queues    = BOND_DEFAULT_TX_QUEUES;
  90 static int num_peer_notif = 1;
  91 static int miimon;
  92 static int updelay;
  93 static int downdelay;
  94 static int use_carrier  = 1;
  95 static char *mode;
  96 static char *primary;
  97 static char *primary_reselect;
  98 static char *lacp_rate;
  99 static int min_links;
 100 static char *ad_select;
 101 static char *xmit_hash_policy;
 102 static int arp_interval;
 103 static char *arp_ip_target[BOND_MAX_ARP_TARGETS];
 104 static char *arp_validate;
 105 static char *arp_all_targets;
 106 static char *fail_over_mac;
 107 static int all_slaves_active;
 108 static struct bond_params bonding_defaults;
 109 static int resend_igmp = BOND_DEFAULT_RESEND_IGMP;
 110 static int packets_per_slave = 1;
 111 static int lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
 112
 113 module_param(max_bonds, int, 0);
 114 MODULE_PARM_DESC(max_bonds, "Max number of bonded devices");
 115 module_param(tx_queues, int, 0);
 116 MODULE_PARM_DESC(tx_queues, "Max number of transmit queues (default = 16)");
 117 module_param_named(num_grat_arp, num_peer_notif, int, 0644);
 118 MODULE_PARM_DESC(num_grat_arp, "Number of peer notifications to send on "
 119                                "failover event (alias of num_unsol_na)");
 120 module_param_named(num_unsol_na, num_peer_notif, int, 0644);
 121 MODULE_PARM_DESC(num_unsol_na, "Number of peer notifications to send on "
 122                                "failover event (alias of num_grat_arp)");
 123 module_param(miimon, int, 0);
 124 MODULE_PARM_DESC(miimon, "Link check interval in milliseconds");
 125 module_param(updelay, int, 0);
 126 MODULE_PARM_DESC(updelay, "Delay before considering link up, in milliseconds");
 127 module_param(downdelay, int, 0);
 128 MODULE_PARM_DESC(downdelay, "Delay before considering link down, "
 129                             "in milliseconds");
 130 module_param(use_carrier, int, 0);
 131 MODULE_PARM_DESC(use_carrier, "Use netif_carrier_ok (vs MII ioctls) in miimon; "
 132                               "0 for off, 1 for on (default)");
 133 module_param(mode, charp, 0);
 134 MODULE_PARM_DESC(mode, "Mode of operation; 0 for balance-rr, "
 135                        "1 for active-backup, 2 for balance-xor, "
 136                        "3 for broadcast, 4 for 802.3ad, 5 for balance-tlb, "
 137                        "6 for balance-alb");
 138 module_param(primary, charp, 0);
 139 MODULE_PARM_DESC(primary, "Primary network device to use");
 140 module_param(primary_reselect, charp, 0);
 141 MODULE_PARM_DESC(primary_reselect, "Reselect primary slave "
 142                                    "once it comes up; "
 143                                    "0 for always (default), "
 144                                    "1 for only if speed of primary is "
 145                                    "better, "
 146                                    "2 for only on active slave "
 147                                    "failure");
 148 module_param(lacp_rate, charp, 0);
 149 MODULE_PARM_DESC(lacp_rate, "LACPDU tx rate to request from 802.3ad partner; "
 150                             "0 for slow, 1 for fast");
 151 module_param(ad_select, charp, 0);
 152 MODULE_PARM_DESC(ad_select, "803.ad aggregation selection logic; "
 153                             "0 for stable (default), 1 for bandwidth, "
 154                             "2 for count");
 155 module_param(min_links, int, 0);
 156 MODULE_PARM_DESC(min_links, "Minimum number of available links before turning on carrier");
 157
 158 module_param(xmit_hash_policy, charp, 0);
 159 MODULE_PARM_DESC(xmit_hash_policy, "balance-xor and 802.3ad hashing method; "
 160                                    "0 for layer 2 (default), 1 for layer 3+4, "
 161                                    "2 for layer 2+3, 3 for encap layer 2+3, "
 162                                    "4 for encap layer 3+4");
 163 module_param(arp_interval, int, 0);
 164 MODULE_PARM_DESC(arp_interval, "arp interval in milliseconds");
 165 module_param_array(arp_ip_target, charp, NULL, 0);
 166 MODULE_PARM_DESC(arp_ip_target, "arp targets in n.n.n.n form");
 167 module_param(arp_validate, charp, 0);
 168 MODULE_PARM_DESC(arp_validate, "validate src/dst of ARP probes; "
 169                                "0 for none (default), 1 for active, "
 170                                "2 for backup, 3 for all");
 171 module_param(arp_all_targets, charp, 0);
 172 MODULE_PARM_DESC(arp_all_targets, "fail on any/all arp targets timeout; 0 for any (default), 1 for all");
 173 module_param(fail_over_mac, charp, 0);
 174 MODULE_PARM_DESC(fail_over_mac, "For active-backup, do not set all slaves to "
 175                                 "the same MAC; 0 for none (default), "
 176                                 "1 for active, 2 for follow");
 177 module_param(all_slaves_active, int, 0);
 178 MODULE_PARM_DESC(all_slaves_active, "Keep all frames received on an interface"
 179                                      "by setting active flag for all slaves; "
 180                                      "0 for never (default), 1 for always.");
 181 module_param(resend_igmp, int, 0);
 182 MODULE_PARM_DESC(resend_igmp, "Number of IGMP membership reports to send on "
 183                               "link failure");
 184 module_param(packets_per_slave, int, 0);
 185 MODULE_PARM_DESC(packets_per_slave, "Packets to send per slave in balance-rr "
 186                                     "mode; 0 for a random slave, 1 packet per "
 187                                     "slave (default), >1 packets per slave.");
 188 module_param(lp_interval, uint, 0);
 189 MODULE_PARM_DESC(lp_interval, "The number of seconds between instances where "
 190                               "the bonding driver sends learning packets to "
 191                               "each slaves peer switch. The default is 1.");
 192
 193 /*----------------------------- Global variables ----------------------------*/
 194
 195 #ifdef CONFIG_NET_POLL_CONTROLLER
 196 atomic_t netpoll_block_tx = ATOMIC_INIT(0);
 197 #endif
 198
 199 int bond_net_id __read_mostly;
 200
 201 static __be32 arp_target[BOND_MAX_ARP_TARGETS];
 202 static int arp_ip_count;
 203 static int bond_mode    = BOND_MODE_ROUNDROBIN;
 204 static int xmit_hashtype = BOND_XMIT_POLICY_LAYER2;
 205 static int lacp_fast;
 206
 207 /*-------------------------- Forward declarations ---------------------------*/
 208
 209 static int bond_init(struct net_device *bond_dev);
 210 static void bond_uninit(struct net_device *bond_dev);
 211
 212 /*---------------------------- General routines -----------------------------*/
 213
 214 const char *bond_mode_name(int mode)
 215 {
 216         static const char *names[] = {
 217                 [BOND_MODE_ROUNDROBIN] = "load balancing (round-robin)",
 218                 [BOND_MODE_ACTIVEBACKUP] = "fault-tolerance (active-backup)",
 219                 [BOND_MODE_XOR] = "load balancing (xor)",
 220                 [BOND_MODE_BROADCAST] = "fault-tolerance (broadcast)",
 221                 [BOND_MODE_8023AD] = "IEEE 802.3ad Dynamic link aggregation",
 222                 [BOND_MODE_TLB] = "transmit load balancing",
 223                 [BOND_MODE_ALB] = "adaptive load balancing",
 224         };
 225
 226         if (mode < BOND_MODE_ROUNDROBIN || mode > BOND_MODE_ALB)
 227                 return "unknown";
 228
 229         return names[mode];
 230 }
 231
 232 /*---------------------------------- VLAN -----------------------------------*/
 233
 234 /**
 235  * bond_dev_queue_xmit - Prepare skb for xmit.
 236  *
 237  * @bond: bond device that got this skb for tx.
 238  * @skb: hw accel VLAN tagged skb to transmit
 239  * @slave_dev: slave that is supposed to xmit this skbuff
 240  */
 241 void bond_dev_queue_xmit(struct bonding *bond, struct sk_buff *skb,
 242                         struct net_device *slave_dev)
 243 {
 244         skb->dev = slave_dev;
 245
 246         BUILD_BUG_ON(sizeof(skb->queue_mapping) !=
 247                      sizeof(qdisc_skb_cb(skb)->slave_dev_queue_mapping));
 248         skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
 249
 250         if (unlikely(netpoll_tx_running(bond->dev)))
 251                 bond_netpoll_send_skb(bond_get_slave_by_dev(bond, slave_dev), skb);
 252         else
 253                 dev_queue_xmit(skb);
 254 }
 255
 256 /*
 257  * In the following 2 functions, bond_vlan_rx_add_vid and bond_vlan_rx_kill_vid,
 258  * We don't protect the slave list iteration with a lock because:
 259  * a. This operation is performed in IOCTL context,
 260  * b. The operation is protected by the RTNL semaphore in the 8021q code,
 261  * c. Holding a lock with BH disabled while directly calling a base driver
 262  *    entry point is generally a BAD idea.
 263  *
 264  * The design of synchronization/protection for this operation in the 8021q
 265  * module is good for one or more VLAN devices over a single physical device
 266  * and cannot be extended for a teaming solution like bonding, so there is a
 267  * potential race condition here where a net device from the vlan group might
 268  * be referenced (either by a base driver or the 8021q code) while it is being
 269  * removed from the system. However, it turns out we're not making matters
 270  * worse, and if it works for regular VLAN usage it will work here too.
 271 */
 272
 273 /**
 274  * bond_vlan_rx_add_vid - Propagates adding an id to slaves
 275  * @bond_dev: bonding net device that got called
 276  * @vid: vlan id being added
 277  */
 278 static int bond_vlan_rx_add_vid(struct net_device *bond_dev,
 279                                 __be16 proto, u16 vid)
 280 {
 281         struct bonding *bond = netdev_priv(bond_dev);
 282         struct slave *slave, *rollback_slave;
 283         struct list_head *iter;
 284         int res;
 285
 286         bond_for_each_slave(bond, slave, iter) {
 287                 res = vlan_vid_add(slave->dev, proto, vid);
 288                 if (res)
 289                         goto unwind;
 290         }
 291
 292         return 0;
 293
 294 unwind:
 295         /* unwind to the slave that failed */
 296         bond_for_each_slave(bond, rollback_slave, iter) {
 297                 if (rollback_slave == slave)
 298                         break;
 299
 300                 vlan_vid_del(rollback_slave->dev, proto, vid);
 301         }
 302
 303         return res;
 304 }
 305
 306 /**
 307  * bond_vlan_rx_kill_vid - Propagates deleting an id to slaves
 308  * @bond_dev: bonding net device that got called
 309  * @vid: vlan id being removed
 310  */
 311 static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 312                                  __be16 proto, u16 vid)
 313 {
 314         struct bonding *bond = netdev_priv(bond_dev);
 315         struct list_head *iter;
 316         struct slave *slave;
 317
 318         bond_for_each_slave(bond, slave, iter)
 319                 vlan_vid_del(slave->dev, proto, vid);
 320
 321         if (bond_is_lb(bond))
 322                 bond_alb_clear_vlan(bond, vid);
 323
 324         return 0;
 325 }
 326
 327 /*------------------------------- Link status -------------------------------*/
 328
 329 /*
 330  * Set the carrier state for the master according to the state of its
 331  * slaves.  If any slaves are up, the master is up.  In 802.3ad mode,
 332  * do special 802.3ad magic.
 333  *
 334  * Returns zero if carrier state does not change, nonzero if it does.
 335  */
 336 static int bond_set_carrier(struct bonding *bond)
 337 {
 338         struct list_head *iter;
 339         struct slave *slave;
 340
 341         if (!bond_has_slaves(bond))
 342                 goto down;
 343
 344         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 345                 return bond_3ad_set_carrier(bond);
 346
 347         bond_for_each_slave(bond, slave, iter) {
 348                 if (slave->link == BOND_LINK_UP) {
 349                         if (!netif_carrier_ok(bond->dev)) {
 350                                 netif_carrier_on(bond->dev);
 351                                 return 1;
 352                         }
 353                         return 0;
 354                 }
 355         }
 356
 357 down:
 358         if (netif_carrier_ok(bond->dev)) {
 359                 netif_carrier_off(bond->dev);
 360                 return 1;
 361         }
 362         return 0;
 363 }
 364
 365 /*
 366  * Get link speed and duplex from the slave's base driver
 367  * using ethtool. If for some reason the call fails or the
 368  * values are invalid, set speed and duplex to -1,
 369  * and return.
 370  */
 371 static void bond_update_speed_duplex(struct slave *slave)
 372 {
 373         struct net_device *slave_dev = slave->dev;
 374         struct ethtool_cmd ecmd;
 375         u32 slave_speed;
 376         int res;
 377
 378         slave->speed = SPEED_UNKNOWN;
 379         slave->duplex = DUPLEX_UNKNOWN;
 380
 381         res = __ethtool_get_settings(slave_dev, &ecmd);
 382         if (res < 0)
 383                 return;
 384
 385         slave_speed = ethtool_cmd_speed(&ecmd);
 386         if (slave_speed == 0 || slave_speed == ((__u32) -1))
 387                 return;
 388
 389         switch (ecmd.duplex) {
 390         case DUPLEX_FULL:
 391         case DUPLEX_HALF:
 392                 break;
 393         default:
 394                 return;
 395         }
 396
 397         slave->speed = slave_speed;
 398         slave->duplex = ecmd.duplex;
 399
 400         return;
 401 }
 402
 403 const char *bond_slave_link_status(s8 link)
 404 {
 405         switch (link) {
 406         case BOND_LINK_UP:
 407                 return "up";
 408         case BOND_LINK_FAIL:
 409                 return "going down";
 410         case BOND_LINK_DOWN:
 411                 return "down";
 412         case BOND_LINK_BACK:
 413                 return "going back";
 414         default:
 415                 return "unknown";
 416         }
 417 }
 418
 419 /*
 420  * if <dev> supports MII link status reporting, check its link status.
 421  *
 422  * We either do MII/ETHTOOL ioctls, or check netif_carrier_ok(),
 423  * depending upon the setting of the use_carrier parameter.
 424  *
 425  * Return either BMSR_LSTATUS, meaning that the link is up (or we
 426  * can't tell and just pretend it is), or 0, meaning that the link is
 427  * down.
 428  *
 429  * If reporting is non-zero, instead of faking link up, return -1 if
 430  * both ETHTOOL and MII ioctls fail (meaning the device does not
 431  * support them).  If use_carrier is set, return whatever it says.
 432  * It'd be nice if there was a good way to tell if a driver supports
 433  * netif_carrier, but there really isn't.
 434  */
 435 static int bond_check_dev_link(struct bonding *bond,
 436                                struct net_device *slave_dev, int reporting)
 437 {
 438         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
 439         int (*ioctl)(struct net_device *, struct ifreq *, int);
 440         struct ifreq ifr;
 441         struct mii_ioctl_data *mii;
 442
 443         if (!reporting && !netif_running(slave_dev))
 444                 return 0;
 445
 446         if (bond->params.use_carrier)
 447                 return netif_carrier_ok(slave_dev) ? BMSR_LSTATUS : 0;
 448
 449         /* Try to get link status using Ethtool first. */
 450         if (slave_dev->ethtool_ops->get_link)
 451                 return slave_dev->ethtool_ops->get_link(slave_dev) ?
 452                         BMSR_LSTATUS : 0;
 453
 454         /* Ethtool can't be used, fallback to MII ioctls. */
 455         ioctl = slave_ops->ndo_do_ioctl;
 456         if (ioctl) {
 457                 /* TODO: set pointer to correct ioctl on a per team member */
 458                 /*       bases to make this more efficient. that is, once  */
 459                 /*       we determine the correct ioctl, we will always    */
 460                 /*       call it and not the others for that team          */
 461                 /*       member.                                           */
 462
 463                 /*
 464                  * We cannot assume that SIOCGMIIPHY will also read a
 465                  * register; not all network drivers (e.g., e100)
 466                  * support that.
 467                  */
 468
 469                 /* Yes, the mii is overlaid on the ifreq.ifr_ifru */
 470                 strncpy(ifr.ifr_name, slave_dev->name, IFNAMSIZ);
 471                 mii = if_mii(&ifr);
 472                 if (IOCTL(slave_dev, &ifr, SIOCGMIIPHY) == 0) {
 473                         mii->reg_num = MII_BMSR;
 474                         if (IOCTL(slave_dev, &ifr, SIOCGMIIREG) == 0)
 475                                 return mii->val_out & BMSR_LSTATUS;
 476                 }
 477         }
 478
 479         /*
 480          * If reporting, report that either there's no dev->do_ioctl,
 481          * or both SIOCGMIIREG and get_link failed (meaning that we
 482          * cannot report link status).  If not reporting, pretend
 483          * we're ok.
 484          */
 485         return reporting ? -1 : BMSR_LSTATUS;
 486 }
 487
 488 /*----------------------------- Multicast list ------------------------------*/
 489
 490 /*
 491  * Push the promiscuity flag down to appropriate slaves
 492  */
 493 static int bond_set_promiscuity(struct bonding *bond, int inc)
 494 {
 495         struct list_head *iter;
 496         int err = 0;
 497
 498         if (bond_uses_primary(bond)) {
 499                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 500
 501                 if (curr_active)
 502                         err = dev_set_promiscuity(curr_active->dev, inc);
 503         } else {
 504                 struct slave *slave;
 505
 506                 bond_for_each_slave(bond, slave, iter) {
 507                         err = dev_set_promiscuity(slave->dev, inc);
 508                         if (err)
 509                                 return err;
 510                 }
 511         }
 512         return err;
 513 }
 514
 515 /*
 516  * Push the allmulti flag down to all slaves
 517  */
 518 static int bond_set_allmulti(struct bonding *bond, int inc)
 519 {
 520         struct list_head *iter;
 521         int err = 0;
 522
 523         if (bond_uses_primary(bond)) {
 524                 struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
 525
 526                 if (curr_active)
 527                         err = dev_set_allmulti(curr_active->dev, inc);
 528         } else {
 529                 struct slave *slave;
 530
 531                 bond_for_each_slave(bond, slave, iter) {
 532                         err = dev_set_allmulti(slave->dev, inc);
 533                         if (err)
 534                                 return err;
 535                 }
 536         }
 537         return err;
 538 }
 539
 540 /*
 541  * Retrieve the list of registered multicast addresses for the bonding
 542  * device and retransmit an IGMP JOIN request to the current active
 543  * slave.
 544  */
 545 static void bond_resend_igmp_join_requests_delayed(struct work_struct *work)
 546 {
 547         struct bonding *bond = container_of(work, struct bonding,
 548                                             mcast_work.work);
 549
 550         if (!rtnl_trylock()) {
 551                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 552                 return;
 553         }
 554         call_netdevice_notifiers(NETDEV_RESEND_IGMP, bond->dev);
 555
 556         if (bond->igmp_retrans > 1) {
 557                 bond->igmp_retrans--;
 558                 queue_delayed_work(bond->wq, &bond->mcast_work, HZ/5);
 559         }
 560         rtnl_unlock();
 561 }
 562
 563 /* Flush bond's hardware addresses from slave
 564  */
 565 static void bond_hw_addr_flush(struct net_device *bond_dev,
 566                                struct net_device *slave_dev)
 567 {
 568         struct bonding *bond = netdev_priv(bond_dev);
 569
 570         dev_uc_unsync(slave_dev, bond_dev);
 571         dev_mc_unsync(slave_dev, bond_dev);
 572
 573         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
 574                 /* del lacpdu mc addr from mc list */
 575                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
 576
 577                 dev_mc_del(slave_dev, lacpdu_multicast);
 578         }
 579 }
 580
 581 /*--------------------------- Active slave change ---------------------------*/
 582
 583 /* Update the hardware address list and promisc/allmulti for the new and
 584  * old active slaves (if any).  Modes that are not using primary keep all
 585  * slaves up date at all times; only the modes that use primary need to call
 586  * this function to swap these settings during a failover.
 587  */
 588 static void bond_hw_addr_swap(struct bonding *bond, struct slave *new_active,
 589                               struct slave *old_active)
 590 {
 591         ASSERT_RTNL();
 592
 593         if (old_active) {
 594                 if (bond->dev->flags & IFF_PROMISC)
 595                         dev_set_promiscuity(old_active->dev, -1);
 596
 597                 if (bond->dev->flags & IFF_ALLMULTI)
 598                         dev_set_allmulti(old_active->dev, -1);
 599
 600                 bond_hw_addr_flush(bond->dev, old_active->dev);
 601         }
 602
 603         if (new_active) {
 604                 /* FIXME: Signal errors upstream. */
 605                 if (bond->dev->flags & IFF_PROMISC)
 606                         dev_set_promiscuity(new_active->dev, 1);
 607
 608                 if (bond->dev->flags & IFF_ALLMULTI)
 609                         dev_set_allmulti(new_active->dev, 1);
 610
 611                 netif_addr_lock_bh(bond->dev);
 612                 dev_uc_sync(new_active->dev, bond->dev);
 613                 dev_mc_sync(new_active->dev, bond->dev);
 614                 netif_addr_unlock_bh(bond->dev);
 615         }
 616 }
 617
 618 /**
 619  * bond_set_dev_addr - clone slave's address to bond
 620  * @bond_dev: bond net device
 621  * @slave_dev: slave net device
 622  *
 623  * Should be called with RTNL held.
 624  */
 625 static void bond_set_dev_addr(struct net_device *bond_dev,
 626                               struct net_device *slave_dev)
 627 {
 628         netdev_dbg(bond_dev, "bond_dev=%p slave_dev=%p slave_dev->addr_len=%d\n",
 629                    bond_dev, slave_dev, slave_dev->addr_len);
 630         memcpy(bond_dev->dev_addr, slave_dev->dev_addr, slave_dev->addr_len);
 631         bond_dev->addr_assign_type = NET_ADDR_STOLEN;
 632         call_netdevice_notifiers(NETDEV_CHANGEADDR, bond_dev);
 633 }
 634
 635 /*
 636  * bond_do_fail_over_mac
 637  *
 638  * Perform special MAC address swapping for fail_over_mac settings
 639  *
 640  * Called with RTNL, curr_slave_lock for write_bh.
 641  */
 642 static void bond_do_fail_over_mac(struct bonding *bond,
 643                                   struct slave *new_active,
 644                                   struct slave *old_active)
 645         __releases(&bond->curr_slave_lock)
 646         __acquires(&bond->curr_slave_lock)
 647 {
 648         u8 tmp_mac[ETH_ALEN];
 649         struct sockaddr saddr;
 650         int rv;
 651
 652         switch (bond->params.fail_over_mac) {
 653         case BOND_FOM_ACTIVE:
 654                 if (new_active) {
 655                         write_unlock_bh(&bond->curr_slave_lock);
 656                         bond_set_dev_addr(bond->dev, new_active->dev);
 657                         write_lock_bh(&bond->curr_slave_lock);
 658                 }
 659                 break;
 660         case BOND_FOM_FOLLOW:
 661                 /*
 662                  * if new_active && old_active, swap them
 663                  * if just old_active, do nothing (going to no active slave)
 664                  * if just new_active, set new_active to bond's MAC
 665                  */
 666                 if (!new_active)
 667                         return;
 668
 669                 write_unlock_bh(&bond->curr_slave_lock);
 670
 671                 if (old_active) {
 672                         ether_addr_copy(tmp_mac, new_active->dev->dev_addr);
 673                         ether_addr_copy(saddr.sa_data,
 674                                         old_active->dev->dev_addr);
 675                         saddr.sa_family = new_active->dev->type;
 676                 } else {
 677                         ether_addr_copy(saddr.sa_data, bond->dev->dev_addr);
 678                         saddr.sa_family = bond->dev->type;
 679                 }
 680
 681                 rv = dev_set_mac_address(new_active->dev, &saddr);
 682                 if (rv) {
 683                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 684                                    -rv, new_active->dev->name);
 685                         goto out;
 686                 }
 687
 688                 if (!old_active)
 689                         goto out;
 690
 691                 ether_addr_copy(saddr.sa_data, tmp_mac);
 692                 saddr.sa_family = old_active->dev->type;
 693
 694                 rv = dev_set_mac_address(old_active->dev, &saddr);
 695                 if (rv)
 696                         netdev_err(bond->dev, "Error %d setting MAC of slave %s\n",
 697                                    -rv, new_active->dev->name);
 698 out:
 699                 write_lock_bh(&bond->curr_slave_lock);
 700                 break;
 701         default:
 702                 netdev_err(bond->dev, "bond_do_fail_over_mac impossible: bad policy %d\n",
 703                            bond->params.fail_over_mac);
 704                 break;
 705         }
 706
 707 }
 708
 709 static bool bond_should_change_active(struct bonding *bond)
 710 {
 711         struct slave *prim = bond->primary_slave;
 712         struct slave *curr = bond_deref_active_protected(bond);
 713
 714         if (!prim || !curr || curr->link != BOND_LINK_UP)
 715                 return true;
 716         if (bond->force_primary) {
 717                 bond->force_primary = false;
 718                 return true;
 719         }
 720         if (bond->params.primary_reselect == BOND_PRI_RESELECT_BETTER &&
 721             (prim->speed < curr->speed ||
 722              (prim->speed == curr->speed && prim->duplex <= curr->duplex)))
 723                 return false;
 724         if (bond->params.primary_reselect == BOND_PRI_RESELECT_FAILURE)
 725                 return false;
 726         return true;
 727 }
 728
 729 /**
 730  * find_best_interface - select the best available slave to be the active one
 731  * @bond: our bonding struct
 732  */
 733 static struct slave *bond_find_best_slave(struct bonding *bond)
 734 {
 735         struct slave *slave, *bestslave = NULL;
 736         struct list_head *iter;
 737         int mintime = bond->params.updelay;
 738
 739         if (bond->primary_slave && bond->primary_slave->link == BOND_LINK_UP &&
 740             bond_should_change_active(bond))
 741                 return bond->primary_slave;
 742
 743         bond_for_each_slave(bond, slave, iter) {
 744                 if (slave->link == BOND_LINK_UP)
 745                         return slave;
 746                 if (slave->link == BOND_LINK_BACK && bond_slave_is_up(slave) &&
 747                     slave->delay < mintime) {
 748                         mintime = slave->delay;
 749                         bestslave = slave;
 750                 }
 751         }
 752
 753         return bestslave;
 754 }
 755
 756 static bool bond_should_notify_peers(struct bonding *bond)
 757 {
 758         struct slave *slave;
 759
 760         rcu_read_lock();
 761         slave = rcu_dereference(bond->curr_active_slave);
 762         rcu_read_unlock();
 763
 764         netdev_dbg(bond->dev, "bond_should_notify_peers: slave %s\n",
 765                    slave ? slave->dev->name : "NULL");
 766
 767         if (!slave || !bond->send_peer_notif ||
 768             test_bit(__LINK_STATE_LINKWATCH_PENDING, &slave->dev->state))
 769                 return false;
 770
 771         return true;
 772 }
 773
 774 /**
 775  * change_active_interface - change the active slave into the specified one
 776  * @bond: our bonding struct
 777  * @new: the new slave to make the active one
 778  *
 779  * Set the new slave to the bond's settings and unset them on the old
 780  * curr_active_slave.
 781  * Setting include flags, mc-list, promiscuity, allmulti, etc.
 782  *
 783  * If @new's link state is %BOND_LINK_BACK we'll set it to %BOND_LINK_UP,
 784  * because it is apparently the best available slave we have, even though its
 785  * updelay hasn't timed out yet.
 786  *
 787  * If new_active is not NULL, caller must hold curr_slave_lock for write_bh.
 788  */
 789 void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 790 {
 791         struct slave *old_active;
 792
 793         old_active = rcu_dereference_protected(bond->curr_active_slave,
 794                                                !new_active ||
 795                                                lockdep_is_held(&bond->curr_slave_lock));
 796
 797         if (old_active == new_active)
 798                 return;
 799
 800         if (new_active) {
 801                 new_active->last_link_up = jiffies;
 802
 803                 if (new_active->link == BOND_LINK_BACK) {
 804                         if (bond_uses_primary(bond)) {
 805                                 netdev_info(bond->dev, "making interface %s the new active one %d ms earlier\n",
 806                                             new_active->dev->name,
 807                                             (bond->params.updelay - new_active->delay) * bond->params.miimon);
 808                         }
 809
 810                         new_active->delay = 0;
 811                         new_active->link = BOND_LINK_UP;
 812
 813                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
 814                                 bond_3ad_handle_link_change(new_active, BOND_LINK_UP);
 815
 816                         if (bond_is_lb(bond))
 817                                 bond_alb_handle_link_change(bond, new_active, BOND_LINK_UP);
 818                 } else {
 819                         if (bond_uses_primary(bond)) {
 820                                 netdev_info(bond->dev, "making interface %s the new active one\n",
 821                                             new_active->dev->name);
 822                         }
 823                 }
 824         }
 825
 826         if (bond_uses_primary(bond))
 827                 bond_hw_addr_swap(bond, new_active, old_active);
 828
 829         if (bond_is_lb(bond)) {
 830                 bond_alb_handle_active_change(bond, new_active);
 831                 if (old_active)
 832                         bond_set_slave_inactive_flags(old_active,
 833                                                       BOND_SLAVE_NOTIFY_NOW);
 834                 if (new_active)
 835                         bond_set_slave_active_flags(new_active,
 836                                                     BOND_SLAVE_NOTIFY_NOW);
 837         } else {
 838                 rcu_assign_pointer(bond->curr_active_slave, new_active);
 839         }
 840
 841         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) {
 842                 if (old_active)
 843                         bond_set_slave_inactive_flags(old_active,
 844                                                       BOND_SLAVE_NOTIFY_NOW);
 845
 846                 if (new_active) {
 847                         bool should_notify_peers = false;
 848
 849                         bond_set_slave_active_flags(new_active,
 850                                                     BOND_SLAVE_NOTIFY_NOW);
 851
 852                         if (bond->params.fail_over_mac)
 853                                 bond_do_fail_over_mac(bond, new_active,
 854                                                       old_active);
 855
 856                         if (netif_running(bond->dev)) {
 857                                 bond->send_peer_notif =
 858                                         bond->params.num_peer_notif;
 859                                 should_notify_peers =
 860                                         bond_should_notify_peers(bond);
 861                         }
 862
 863                         write_unlock_bh(&bond->curr_slave_lock);
 864
 865                         call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 866                         if (should_notify_peers)
 867                                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
 868                                                          bond->dev);
 869
 870                         write_lock_bh(&bond->curr_slave_lock);
 871                 }
 872         }
 873
 874         /* resend IGMP joins since active slave has changed or
 875          * all were sent on curr_active_slave.
 876          * resend only if bond is brought up with the affected
 877          * bonding modes and the retransmission is enabled */
 878         if (netif_running(bond->dev) && (bond->params.resend_igmp > 0) &&
 879             ((bond_uses_primary(bond) && new_active) ||
 880              BOND_MODE(bond) == BOND_MODE_ROUNDROBIN)) {
 881                 bond->igmp_retrans = bond->params.resend_igmp;
 882                 queue_delayed_work(bond->wq, &bond->mcast_work, 1);
 883         }
 884 }
 885
 886 /**
 887  * bond_select_active_slave - select a new active slave, if needed
 888  * @bond: our bonding struct
 889  *
 890  * This functions should be called when one of the following occurs:
 891  * - The old curr_active_slave has been released or lost its link.
 892  * - The primary_slave has got its link back.
 893  * - A slave has got its link back and there's no old curr_active_slave.
 894  *
 895  * Caller must hold curr_slave_lock for write_bh.
 896  */
 897 void bond_select_active_slave(struct bonding *bond)
 898 {
 899         struct slave *best_slave;
 900         int rv;
 901
 902         best_slave = bond_find_best_slave(bond);
 903         if (best_slave != bond_deref_active_protected(bond)) {
 904                 bond_change_active_slave(bond, best_slave);
 905                 rv = bond_set_carrier(bond);
 906                 if (!rv)
 907                         return;
 908
 909                 if (netif_carrier_ok(bond->dev)) {
 910                         netdev_info(bond->dev, "first active interface up!\n");
 911                 } else {
 912                         netdev_info(bond->dev, "now running without any active interface!\n");
 913                 }
 914         }
 915 }
 916
 917 #ifdef CONFIG_NET_POLL_CONTROLLER
 918 static inline int slave_enable_netpoll(struct slave *slave)
 919 {
 920         struct netpoll *np;
 921         int err = 0;
 922
 923         np = kzalloc(sizeof(*np), GFP_KERNEL);
 924         err = -ENOMEM;
 925         if (!np)
 926                 goto out;
 927
 928         err = __netpoll_setup(np, slave->dev);
 929         if (err) {
 930                 kfree(np);
 931                 goto out;
 932         }
 933         slave->np = np;
 934 out:
 935         return err;
 936 }
 937 static inline void slave_disable_netpoll(struct slave *slave)
 938 {
 939         struct netpoll *np = slave->np;
 940
 941         if (!np)
 942                 return;
 943
 944         slave->np = NULL;
 945         __netpoll_free_async(np);
 946 }
 947
 948 static void bond_poll_controller(struct net_device *bond_dev)
 949 {
 950 }
 951
 952 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 953 {
 954         struct bonding *bond = netdev_priv(bond_dev);
 955         struct list_head *iter;
 956         struct slave *slave;
 957
 958         bond_for_each_slave(bond, slave, iter)
 959                 if (bond_slave_is_up(slave))
 960                         slave_disable_netpoll(slave);
 961 }
 962
 963 static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni)
 964 {
 965         struct bonding *bond = netdev_priv(dev);
 966         struct list_head *iter;
 967         struct slave *slave;
 968         int err = 0;
 969
 970         bond_for_each_slave(bond, slave, iter) {
 971                 err = slave_enable_netpoll(slave);
 972                 if (err) {
 973                         bond_netpoll_cleanup(dev);
 974                         break;
 975                 }
 976         }
 977         return err;
 978 }
 979 #else
 980 static inline int slave_enable_netpoll(struct slave *slave)
 981 {
 982         return 0;
 983 }
 984 static inline void slave_disable_netpoll(struct slave *slave)
 985 {
 986 }
 987 static void bond_netpoll_cleanup(struct net_device *bond_dev)
 988 {
 989 }
 990 #endif
 991
 992 /*---------------------------------- IOCTL ----------------------------------*/
 993
 994 static netdev_features_t bond_fix_features(struct net_device *dev,
 995                                            netdev_features_t features)
 996 {
 997         struct bonding *bond = netdev_priv(dev);
 998         struct list_head *iter;
 999         netdev_features_t mask;
1000         struct slave *slave;
1001
1002         mask = features;
1003         features &= ~NETIF_F_ONE_FOR_ALL;
1004         features |= NETIF_F_ALL_FOR_ALL;
1005
1006         bond_for_each_slave(bond, slave, iter) {
1007                 features = netdev_increment_features(features,
1008                                                      slave->dev->features,
1009                                                      mask);
1010         }
1011         features = netdev_add_tso_features(features, mask);
1012
1013         return features;
1014 }
1015
1016 #define BOND_VLAN_FEATURES      (NETIF_F_ALL_CSUM | NETIF_F_SG | \
1017                                  NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
1018                                  NETIF_F_HIGHDMA | NETIF_F_LRO)
1019
1020 #define BOND_ENC_FEATURES       (NETIF_F_ALL_CSUM | NETIF_F_SG | NETIF_F_RXCSUM |\
1021                                  NETIF_F_TSO | NETIF_F_GSO_UDP_TUNNEL)
1022
1023 static void bond_compute_features(struct bonding *bond)
1024 {
1025         unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
1026         netdev_features_t vlan_features = BOND_VLAN_FEATURES;
1027         netdev_features_t enc_features  = BOND_ENC_FEATURES;
1028         struct net_device *bond_dev = bond->dev;
1029         struct list_head *iter;
1030         struct slave *slave;
1031         unsigned short max_hard_header_len = ETH_HLEN;
1032         unsigned int gso_max_size = GSO_MAX_SIZE;
1033         u16 gso_max_segs = GSO_MAX_SEGS;
1034
1035         if (!bond_has_slaves(bond))
1036                 goto done;
1037         vlan_features &= NETIF_F_ALL_FOR_ALL;
1038
1039         bond_for_each_slave(bond, slave, iter) {
1040                 vlan_features = netdev_increment_features(vlan_features,
1041                         slave->dev->vlan_features, BOND_VLAN_FEATURES);
1042
1043                 enc_features = netdev_increment_features(enc_features,
1044                                                          slave->dev->hw_enc_features,
1045                                                          BOND_ENC_FEATURES);
1046                 dst_release_flag &= slave->dev->priv_flags;
1047                 if (slave->dev->hard_header_len > max_hard_header_len)
1048                         max_hard_header_len = slave->dev->hard_header_len;
1049
1050                 gso_max_size = min(gso_max_size, slave->dev->gso_max_size);
1051                 gso_max_segs = min(gso_max_segs, slave->dev->gso_max_segs);
1052         }
1053
1054 done:
1055         bond_dev->vlan_features = vlan_features;
1056         bond_dev->hw_enc_features = enc_features;
1057         bond_dev->hard_header_len = max_hard_header_len;
1058         bond_dev->gso_max_segs = gso_max_segs;
1059         netif_set_gso_max_size(bond_dev, gso_max_size);
1060
1061         flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
1062         bond_dev->priv_flags = flags | dst_release_flag;
1063
1064         netdev_change_features(bond_dev);
1065 }
1066
1067 static void bond_setup_by_slave(struct net_device *bond_dev,
1068                                 struct net_device *slave_dev)
1069 {
1070         bond_dev->header_ops        = slave_dev->header_ops;
1071
1072         bond_dev->type              = slave_dev->type;
1073         bond_dev->hard_header_len   = slave_dev->hard_header_len;
1074         bond_dev->addr_len          = slave_dev->addr_len;
1075
1076         memcpy(bond_dev->broadcast, slave_dev->broadcast,
1077                 slave_dev->addr_len);
1078 }
1079
1080 /* On bonding slaves other than the currently active slave, suppress
1081  * duplicates except for alb non-mcast/bcast.
1082  */
1083 static bool bond_should_deliver_exact_match(struct sk_buff *skb,
1084                                             struct slave *slave,
1085                                             struct bonding *bond)
1086 {
1087         if (bond_is_slave_inactive(slave)) {
1088                 if (BOND_MODE(bond) == BOND_MODE_ALB &&
1089                     skb->pkt_type != PACKET_BROADCAST &&
1090                     skb->pkt_type != PACKET_MULTICAST)
1091                         return false;
1092                 return true;
1093         }
1094         return false;
1095 }
1096
1097 static rx_handler_result_t bond_handle_frame(struct sk_buff **pskb)
1098 {
1099         struct sk_buff *skb = *pskb;
1100         struct slave *slave;
1101         struct bonding *bond;
1102         int (*recv_probe)(const struct sk_buff *, struct bonding *,
1103                           struct slave *);
1104         int ret = RX_HANDLER_ANOTHER;
1105
1106         skb = skb_share_check(skb, GFP_ATOMIC);
1107         if (unlikely(!skb))
1108                 return RX_HANDLER_CONSUMED;
1109
1110         *pskb = skb;
1111
1112         slave = bond_slave_get_rcu(skb->dev);
1113         bond = slave->bond;
1114
1115         recv_probe = ACCESS_ONCE(bond->recv_probe);
1116         if (recv_probe) {
1117                 ret = recv_probe(skb, bond, slave);
1118                 if (ret == RX_HANDLER_CONSUMED) {
1119                         consume_skb(skb);
1120                         return ret;
1121                 }
1122         }
1123
1124         if (bond_should_deliver_exact_match(skb, slave, bond)) {
1125                 return RX_HANDLER_EXACT;
1126         }
1127
1128         skb->dev = bond->dev;
1129
1130         if (BOND_MODE(bond) == BOND_MODE_ALB &&
1131             bond->dev->priv_flags & IFF_BRIDGE_PORT &&
1132             skb->pkt_type == PACKET_HOST) {
1133
1134                 if (unlikely(skb_cow_head(skb,
1135                                           skb->data - skb_mac_header(skb)))) {
1136                         kfree_skb(skb);
1137                         return RX_HANDLER_CONSUMED;
1138                 }
1139                 ether_addr_copy(eth_hdr(skb)->h_dest, bond->dev->dev_addr);
1140         }
1141
1142         return ret;
1143 }
1144
1145 static int bond_master_upper_dev_link(struct net_device *bond_dev,
1146                                       struct net_device *slave_dev,
1147                                       struct slave *slave)
1148 {
1149         int err;
1150
1151         err = netdev_master_upper_dev_link_private(slave_dev, bond_dev, slave);
1152         if (err)
1153                 return err;
1154         slave_dev->flags |= IFF_SLAVE;
1155         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1156         return 0;
1157 }
1158
1159 static void bond_upper_dev_unlink(struct net_device *bond_dev,
1160                                   struct net_device *slave_dev)
1161 {
1162         netdev_upper_dev_unlink(slave_dev, bond_dev);
1163         slave_dev->flags &= ~IFF_SLAVE;
1164         rtmsg_ifinfo(RTM_NEWLINK, slave_dev, IFF_SLAVE, GFP_KERNEL);
1165 }
1166
1167 static struct slave *bond_alloc_slave(struct bonding *bond)
1168 {
1169         struct slave *slave = NULL;
1170
1171         slave = kzalloc(sizeof(struct slave), GFP_KERNEL);
1172         if (!slave)
1173                 return NULL;
1174
1175         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1176                 SLAVE_AD_INFO(slave) = kzalloc(sizeof(struct ad_slave_info),
1177                                                GFP_KERNEL);
1178                 if (!SLAVE_AD_INFO(slave)) {
1179                         kfree(slave);
1180                         return NULL;
1181                 }
1182         }
1183         return slave;
1184 }
1185
1186 static void bond_free_slave(struct slave *slave)
1187 {
1188         struct bonding *bond = bond_get_bond_by_slave(slave);
1189
1190         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1191                 kfree(SLAVE_AD_INFO(slave));
1192
1193         kfree(slave);
1194 }
1195
1196 /* enslave device <slave> to bond device <master> */
1197 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
1198 {
1199         struct bonding *bond = netdev_priv(bond_dev);
1200         const struct net_device_ops *slave_ops = slave_dev->netdev_ops;
1201         struct slave *new_slave = NULL, *prev_slave;
1202         struct sockaddr addr;
1203         int link_reporting;
1204         int res = 0, i;
1205
1206         if (!bond->params.use_carrier &&
1207             slave_dev->ethtool_ops->get_link == NULL &&
1208             slave_ops->ndo_do_ioctl == NULL) {
1209                 netdev_warn(bond_dev, "no link monitoring support for %s\n",
1210                             slave_dev->name);
1211         }
1212
1213         /* already enslaved */
1214         if (slave_dev->flags & IFF_SLAVE) {
1215                 netdev_dbg(bond_dev, "Error: Device was already enslaved\n");
1216                 return -EBUSY;
1217         }
1218
1219         if (bond_dev == slave_dev) {
1220                 netdev_err(bond_dev, "cannot enslave bond to itself.\n");
1221                 return -EPERM;
1222         }
1223
1224         /* vlan challenged mutual exclusion */
1225         /* no need to lock since we're protected by rtnl_lock */
1226         if (slave_dev->features & NETIF_F_VLAN_CHALLENGED) {
1227                 netdev_dbg(bond_dev, "%s is NETIF_F_VLAN_CHALLENGED\n",
1228                            slave_dev->name);
1229                 if (vlan_uses_dev(bond_dev)) {
1230                         netdev_err(bond_dev, "Error: cannot enslave VLAN challenged slave %s on VLAN enabled bond %s\n",
1231                                    slave_dev->name, bond_dev->name);
1232                         return -EPERM;
1233                 } else {
1234                         netdev_warn(bond_dev, "enslaved VLAN challenged slave %s. Adding VLANs will be blocked as long as %s is part of bond %s\n",
1235                                     slave_dev->name, slave_dev->name,
1236                                     bond_dev->name);
1237                 }
1238         } else {
1239                 netdev_dbg(bond_dev, "%s is !NETIF_F_VLAN_CHALLENGED\n",
1240                            slave_dev->name);
1241         }
1242
1243         /*
1244          * Old ifenslave binaries are no longer supported.  These can
1245          * be identified with moderate accuracy by the state of the slave:
1246          * the current ifenslave will set the interface down prior to
1247          * enslaving it; the old ifenslave will not.
1248          */
1249         if ((slave_dev->flags & IFF_UP)) {
1250                 netdev_err(bond_dev, "%s is up - this may be due to an out of date ifenslave\n",
1251                            slave_dev->name);
1252                 res = -EPERM;
1253                 goto err_undo_flags;
1254         }
1255
1256         /* set bonding device ether type by slave - bonding netdevices are
1257          * created with ether_setup, so when the slave type is not ARPHRD_ETHER
1258          * there is a need to override some of the type dependent attribs/funcs.
1259          *
1260          * bond ether type mutual exclusion - don't allow slaves of dissimilar
1261          * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond
1262          */
1263         if (!bond_has_slaves(bond)) {
1264                 if (bond_dev->type != slave_dev->type) {
1265                         netdev_dbg(bond_dev, "change device type from %d to %d\n",
1266                                    bond_dev->type, slave_dev->type);
1267
1268                         res = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE,
1269                                                        bond_dev);
1270                         res = notifier_to_errno(res);
1271                         if (res) {
1272                                 netdev_err(bond_dev, "refused to change device type\n");
1273                                 res = -EBUSY;
1274                                 goto err_undo_flags;
1275                         }
1276
1277                         /* Flush unicast and multicast addresses */
1278                         dev_uc_flush(bond_dev);
1279                         dev_mc_flush(bond_dev);
1280
1281                         if (slave_dev->type != ARPHRD_ETHER)
1282                                 bond_setup_by_slave(bond_dev, slave_dev);
1283                         else {
1284                                 ether_setup(bond_dev);
1285                                 bond_dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1286                         }
1287
1288                         call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE,
1289                                                  bond_dev);
1290                 }
1291         } else if (bond_dev->type != slave_dev->type) {
1292                 netdev_err(bond_dev, "%s ether type (%d) is different from other slaves (%d), can not enslave it\n",
1293                            slave_dev->name, slave_dev->type, bond_dev->type);
1294                 res = -EINVAL;
1295                 goto err_undo_flags;
1296         }
1297
1298         if (slave_ops->ndo_set_mac_address == NULL) {
1299                 netdev_warn(bond_dev, "The slave device specified does not support setting the MAC address\n");
1300                 if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP &&
1301                     bond->params.fail_over_mac != BOND_FOM_ACTIVE) {
1302                         if (!bond_has_slaves(bond)) {
1303                                 bond->params.fail_over_mac = BOND_FOM_ACTIVE;
1304                                 netdev_warn(bond_dev, "Setting fail_over_mac to active for active-backup mode\n");
1305                         } else {
1306                                 netdev_err(bond_dev, "The slave device specified does not support setting the MAC address, but fail_over_mac is not set to active\n");
1307                                 res = -EOPNOTSUPP;
1308                                 goto err_undo_flags;
1309                         }
1310                 }
1311         }
1312
1313         call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
1314
1315         /* If this is the first slave, then we need to set the master's hardware
1316          * address to be the same as the slave's. */
1317         if (!bond_has_slaves(bond) &&
1318             bond->dev->addr_assign_type == NET_ADDR_RANDOM)
1319                 bond_set_dev_addr(bond->dev, slave_dev);
1320
1321         new_slave = bond_alloc_slave(bond);
1322         if (!new_slave) {
1323                 res = -ENOMEM;
1324                 goto err_undo_flags;
1325         }
1326
1327         new_slave->bond = bond;
1328         new_slave->dev = slave_dev;
1329         /*
1330          * Set the new_slave's queue_id to be zero.  Queue ID mapping
1331          * is set via sysfs or module option if desired.
1332          */
1333         new_slave->queue_id = 0;
1334
1335         /* Save slave's original mtu and then set it to match the bond */
1336         new_slave->original_mtu = slave_dev->mtu;
1337         res = dev_set_mtu(slave_dev, bond->dev->mtu);
1338         if (res) {
1339                 netdev_dbg(bond_dev, "Error %d calling dev_set_mtu\n", res);
1340                 goto err_free;
1341         }
1342
1343         /*
1344          * Save slave's original ("permanent") mac address for modes
1345          * that need it, and for restoring it upon release, and then
1346          * set it to the master's address
1347          */
1348         ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
1349
1350         if (!bond->params.fail_over_mac ||
1351             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1352                 /*
1353                  * Set slave to master's mac address.  The application already
1354                  * set the master's mac address to that of the first slave
1355                  */
1356                 memcpy(addr.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
1357                 addr.sa_family = slave_dev->type;
1358                 res = dev_set_mac_address(slave_dev, &addr);
1359                 if (res) {
1360                         netdev_dbg(bond_dev, "Error %d calling set_mac_address\n", res);
1361                         goto err_restore_mtu;
1362                 }
1363         }
1364
1365         /* open the slave since the application closed it */
1366         res = dev_open(slave_dev);
1367         if (res) {
1368                 netdev_dbg(bond_dev, "Opening slave %s failed\n", slave_dev->name);
1369                 goto err_restore_mac;
1370         }
1371
1372         slave_dev->priv_flags |= IFF_BONDING;
1373
1374         if (bond_is_lb(bond)) {
1375                 /* bond_alb_init_slave() must be called before all other stages since
1376                  * it might fail and we do not want to have to undo everything
1377                  */
1378                 res = bond_alb_init_slave(bond, new_slave);
1379                 if (res)
1380                         goto err_close;
1381         }
1382
1383         /* If the mode uses primary, then the following is handled by
1384          * bond_change_active_slave().
1385          */
1386         if (!bond_uses_primary(bond)) {
1387                 /* set promiscuity level to new slave */
1388                 if (bond_dev->flags & IFF_PROMISC) {
1389                         res = dev_set_promiscuity(slave_dev, 1);
1390                         if (res)
1391                                 goto err_close;
1392                 }
1393
1394                 /* set allmulti level to new slave */
1395                 if (bond_dev->flags & IFF_ALLMULTI) {
1396                         res = dev_set_allmulti(slave_dev, 1);
1397                         if (res)
1398                                 goto err_close;
1399                 }
1400
1401                 netif_addr_lock_bh(bond_dev);
1402
1403                 dev_mc_sync_multiple(slave_dev, bond_dev);
1404                 dev_uc_sync_multiple(slave_dev, bond_dev);
1405
1406                 netif_addr_unlock_bh(bond_dev);
1407         }
1408
1409         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1410                 /* add lacpdu mc addr to mc list */
1411                 u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
1412
1413                 dev_mc_add(slave_dev, lacpdu_multicast);
1414         }
1415
1416         res = vlan_vids_add_by_dev(slave_dev, bond_dev);
1417         if (res) {
1418                 netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n",
1419                            slave_dev->name);
1420                 goto err_close;
1421         }
1422
1423         prev_slave = bond_last_slave(bond);
1424
1425         new_slave->delay = 0;
1426         new_slave->link_failure_count = 0;
1427
1428         bond_update_speed_duplex(new_slave);
1429
1430         new_slave->last_rx = jiffies -
1431                 (msecs_to_jiffies(bond->params.arp_interval) + 1);
1432         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1433                 new_slave->target_last_arp_rx[i] = new_slave->last_rx;
1434
1435         if (bond->params.miimon && !bond->params.use_carrier) {
1436                 link_reporting = bond_check_dev_link(bond, slave_dev, 1);
1437
1438                 if ((link_reporting == -1) && !bond->params.arp_interval) {
1439                         /*
1440                          * miimon is set but a bonded network driver
1441                          * does not support ETHTOOL/MII and
1442                          * arp_interval is not set.  Note: if
1443                          * use_carrier is enabled, we will never go
1444                          * here (because netif_carrier is always
1445                          * supported); thus, we don't need to change
1446                          * the messages for netif_carrier.
1447                          */
1448                         netdev_warn(bond_dev, "MII and ETHTOOL support not available for interface %s, and arp_interval/arp_ip_target module parameters not specified, thus bonding will not detect link failures! see bonding.txt for details\n",
1449                                     slave_dev->name);
1450                 } else if (link_reporting == -1) {
1451                         /* unable get link status using mii/ethtool */
1452                         netdev_warn(bond_dev, "can't get link status from interface %s; the network driver associated with this interface does not support MII or ETHTOOL link status reporting, thus miimon has no effect on this interface\n",
1453                                     slave_dev->name);
1454                 }
1455         }
1456
1457         /* check for initial state */
1458         if (bond->params.miimon) {
1459                 if (bond_check_dev_link(bond, slave_dev, 0) == BMSR_LSTATUS) {
1460                         if (bond->params.updelay) {
1461                                 new_slave->link = BOND_LINK_BACK;
1462                                 new_slave->delay = bond->params.updelay;
1463                         } else {
1464                                 new_slave->link = BOND_LINK_UP;
1465                         }
1466                 } else {
1467                         new_slave->link = BOND_LINK_DOWN;
1468                 }
1469         } else if (bond->params.arp_interval) {
1470                 new_slave->link = (netif_carrier_ok(slave_dev) ?
1471                         BOND_LINK_UP : BOND_LINK_DOWN);
1472         } else {
1473                 new_slave->link = BOND_LINK_UP;
1474         }
1475
1476         if (new_slave->link != BOND_LINK_DOWN)
1477                 new_slave->last_link_up = jiffies;
1478         netdev_dbg(bond_dev, "Initial state of slave_dev is BOND_LINK_%s\n",
1479                    new_slave->link == BOND_LINK_DOWN ? "DOWN" :
1480                    (new_slave->link == BOND_LINK_UP ? "UP" : "BACK"));
1481
1482         if (bond_uses_primary(bond) && bond->params.primary[0]) {
1483                 /* if there is a primary slave, remember it */
1484                 if (strcmp(bond->params.primary, new_slave->dev->name) == 0) {
1485                         bond->primary_slave = new_slave;
1486                         bond->force_primary = true;
1487                 }
1488         }
1489
1490         switch (BOND_MODE(bond)) {
1491         case BOND_MODE_ACTIVEBACKUP:
1492                 bond_set_slave_inactive_flags(new_slave,
1493                                               BOND_SLAVE_NOTIFY_NOW);
1494                 break;
1495         case BOND_MODE_8023AD:
1496                 /* in 802.3ad mode, the internal mechanism
1497                  * will activate the slaves in the selected
1498                  * aggregator
1499                  */
1500                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1501                 /* if this is the first slave */
1502                 if (!prev_slave) {
1503                         SLAVE_AD_INFO(new_slave)->id = 1;
1504                         /* Initialize AD with the number of times that the AD timer is called in 1 second
1505                          * can be called only after the mac address of the bond is set
1506                          */
1507                         bond_3ad_initialize(bond, 1000/AD_TIMER_INTERVAL);
1508                 } else {
1509                         SLAVE_AD_INFO(new_slave)->id =
1510                                 SLAVE_AD_INFO(prev_slave)->id + 1;
1511                 }
1512
1513                 bond_3ad_bind_slave(new_slave);
1514                 break;
1515         case BOND_MODE_TLB:
1516         case BOND_MODE_ALB:
1517                 bond_set_active_slave(new_slave);
1518                 bond_set_slave_inactive_flags(new_slave, BOND_SLAVE_NOTIFY_NOW);
1519                 break;
1520         default:
1521                 netdev_dbg(bond_dev, "This slave is always active in trunk mode\n");
1522
1523                 /* always active in trunk mode */
1524                 bond_set_active_slave(new_slave);
1525
1526                 /* In trunking mode there is little meaning to curr_active_slave
1527                  * anyway (it holds no special properties of the bond device),
1528                  * so we can change it without calling change_active_interface()
1529                  */
1530                 if (!rcu_access_pointer(bond->curr_active_slave) &&
1531                     new_slave->link == BOND_LINK_UP)
1532                         rcu_assign_pointer(bond->curr_active_slave, new_slave);
1533
1534                 break;
1535         } /* switch(bond_mode) */
1536
1537 #ifdef CONFIG_NET_POLL_CONTROLLER
1538         slave_dev->npinfo = bond->dev->npinfo;
1539         if (slave_dev->npinfo) {
1540                 if (slave_enable_netpoll(new_slave)) {
1541                         netdev_info(bond_dev, "master_dev is using netpoll, but new slave device does not support netpoll\n");
1542                         res = -EBUSY;
1543                         goto err_detach;
1544                 }
1545         }
1546 #endif
1547
1548         res = netdev_rx_handler_register(slave_dev, bond_handle_frame,
1549                                          new_slave);
1550         if (res) {
1551                 netdev_dbg(bond_dev, "Error %d calling netdev_rx_handler_register\n", res);
1552                 goto err_detach;
1553         }
1554
1555         res = bond_master_upper_dev_link(bond_dev, slave_dev, new_slave);
1556         if (res) {
1557                 netdev_dbg(bond_dev, "Error %d calling bond_master_upper_dev_link\n", res);
1558                 goto err_unregister;
1559         }
1560
1561         res = bond_sysfs_slave_add(new_slave);
1562         if (res) {
1563                 netdev_dbg(bond_dev, "Error %d calling bond_sysfs_slave_add\n", res);
1564                 goto err_upper_unlink;
1565         }
1566
1567         bond->slave_cnt++;
1568         bond_compute_features(bond);
1569         bond_set_carrier(bond);
1570
1571         if (bond_uses_primary(bond)) {
1572                 block_netpoll_tx();
1573                 write_lock_bh(&bond->curr_slave_lock);
1574                 bond_select_active_slave(bond);
1575                 write_unlock_bh(&bond->curr_slave_lock);
1576                 unblock_netpoll_tx();
1577         }
1578
1579         netdev_info(bond_dev, "Enslaving %s as %s interface with %s link\n",
1580                     slave_dev->name,
1581                     bond_is_active_slave(new_slave) ? "an active" : "a backup",
1582                     new_slave->link != BOND_LINK_DOWN ? "an up" : "a down");
1583
1584         /* enslave is successful */
1585         return 0;
1586
1587 /* Undo stages on error */
1588 err_upper_unlink:
1589         bond_upper_dev_unlink(bond_dev, slave_dev);
1590
1591 err_unregister:
1592         netdev_rx_handler_unregister(slave_dev);
1593
1594 err_detach:
1595         if (!bond_uses_primary(bond))
1596                 bond_hw_addr_flush(bond_dev, slave_dev);
1597
1598         vlan_vids_del_by_dev(slave_dev, bond_dev);
1599         if (bond->primary_slave == new_slave)
1600                 bond->primary_slave = NULL;
1601         if (rcu_access_pointer(bond->curr_active_slave) == new_slave) {
1602                 block_netpoll_tx();
1603                 write_lock_bh(&bond->curr_slave_lock);
1604                 bond_change_active_slave(bond, NULL);
1605                 bond_select_active_slave(bond);
1606                 write_unlock_bh(&bond->curr_slave_lock);
1607                 unblock_netpoll_tx();
1608         }
1609         slave_disable_netpoll(new_slave);
1610
1611 err_close:
1612         slave_dev->priv_flags &= ~IFF_BONDING;
1613         dev_close(slave_dev);
1614
1615 err_restore_mac:
1616         if (!bond->params.fail_over_mac ||
1617             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1618                 /* XXX TODO - fom follow mode needs to change master's
1619                  * MAC if this slave's MAC is in use by the bond, or at
1620                  * least print a warning.
1621                  */
1622                 ether_addr_copy(addr.sa_data, new_slave->perm_hwaddr);
1623                 addr.sa_family = slave_dev->type;
1624                 dev_set_mac_address(slave_dev, &addr);
1625         }
1626
1627 err_restore_mtu:
1628         dev_set_mtu(slave_dev, new_slave->original_mtu);
1629
1630 err_free:
1631         bond_free_slave(new_slave);
1632
1633 err_undo_flags:
1634         /* Enslave of first slave has failed and we need to fix master's mac */
1635         if (!bond_has_slaves(bond) &&
1636             ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr))
1637                 eth_hw_addr_random(bond_dev);
1638
1639         return res;
1640 }
1641
1642 /*
1643  * Try to release the slave device <slave> from the bond device <master>
1644  * It is legal to access curr_active_slave without a lock because all the function
1645  * is write-locked. If "all" is true it means that the function is being called
1646  * while destroying a bond interface and all slaves are being released.
1647  *
1648  * The rules for slave state should be:
1649  *   for Active/Backup:
1650  *     Active stays on all backups go down
1651  *   for Bonded connections:
1652  *     The first up interface should be left on and all others downed.
1653  */
1654 static int __bond_release_one(struct net_device *bond_dev,
1655                               struct net_device *slave_dev,
1656                               bool all)
1657 {
1658         struct bonding *bond = netdev_priv(bond_dev);
1659         struct slave *slave, *oldcurrent;
1660         struct sockaddr addr;
1661         int old_flags = bond_dev->flags;
1662         netdev_features_t old_features = bond_dev->features;
1663
1664         /* slave is not a slave or master is not master of this slave */
1665         if (!(slave_dev->flags & IFF_SLAVE) ||
1666             !netdev_has_upper_dev(slave_dev, bond_dev)) {
1667                 netdev_err(bond_dev, "cannot release %s\n",
1668                            slave_dev->name);
1669                 return -EINVAL;
1670         }
1671
1672         block_netpoll_tx();
1673
1674         slave = bond_get_slave_by_dev(bond, slave_dev);
1675         if (!slave) {
1676                 /* not a slave of this bond */
1677                 netdev_info(bond_dev, "%s not enslaved\n",
1678                             slave_dev->name);
1679                 unblock_netpoll_tx();
1680                 return -EINVAL;
1681         }
1682
1683         bond_sysfs_slave_del(slave);
1684
1685         bond_upper_dev_unlink(bond_dev, slave_dev);
1686         /* unregister rx_handler early so bond_handle_frame wouldn't be called
1687          * for this slave anymore.
1688          */
1689         netdev_rx_handler_unregister(slave_dev);
1690         write_lock_bh(&bond->lock);
1691
1692         /* Inform AD package of unbinding of slave. */
1693         if (BOND_MODE(bond) == BOND_MODE_8023AD)
1694                 bond_3ad_unbind_slave(slave);
1695
1696         write_unlock_bh(&bond->lock);
1697
1698         netdev_info(bond_dev, "Releasing %s interface %s\n",
1699                     bond_is_active_slave(slave) ? "active" : "backup",
1700                     slave_dev->name);
1701
1702         oldcurrent = rcu_access_pointer(bond->curr_active_slave);
1703
1704         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
1705
1706         if (!all && (!bond->params.fail_over_mac ||
1707                      BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)) {
1708                 if (ether_addr_equal_64bits(bond_dev->dev_addr, slave->perm_hwaddr) &&
1709                     bond_has_slaves(bond))
1710                         netdev_warn(bond_dev, "the permanent HWaddr of %s - %pM - is still in use by %s - set the HWaddr of %s to a different address to avoid conflicts\n",
1711                                     slave_dev->name, slave->perm_hwaddr,
1712                                     bond_dev->name, slave_dev->name);
1713         }
1714
1715         if (bond->primary_slave == slave)
1716                 bond->primary_slave = NULL;
1717
1718         if (oldcurrent == slave) {
1719                 write_lock_bh(&bond->curr_slave_lock);
1720                 bond_change_active_slave(bond, NULL);
1721                 write_unlock_bh(&bond->curr_slave_lock);
1722         }
1723
1724         if (bond_is_lb(bond)) {
1725                 /* Must be called only after the slave has been
1726                  * detached from the list and the curr_active_slave
1727                  * has been cleared (if our_slave == old_current),
1728                  * but before a new active slave is selected.
1729                  */
1730                 bond_alb_deinit_slave(bond, slave);
1731         }
1732
1733         if (all) {
1734                 RCU_INIT_POINTER(bond->curr_active_slave, NULL);
1735         } else if (oldcurrent == slave) {
1736                 /*
1737                  * Note that we hold RTNL over this sequence, so there
1738                  * is no concern that another slave add/remove event
1739                  * will interfere.
1740                  */
1741                 write_lock_bh(&bond->curr_slave_lock);
1742
1743                 bond_select_active_slave(bond);
1744
1745                 write_unlock_bh(&bond->curr_slave_lock);
1746         }
1747
1748         if (!bond_has_slaves(bond)) {
1749                 bond_set_carrier(bond);
1750                 eth_hw_addr_random(bond_dev);
1751         }
1752
1753         unblock_netpoll_tx();
1754         synchronize_rcu();
1755         bond->slave_cnt--;
1756
1757         if (!bond_has_slaves(bond)) {
1758                 call_netdevice_notifiers(NETDEV_CHANGEADDR, bond->dev);
1759                 call_netdevice_notifiers(NETDEV_RELEASE, bond->dev);
1760         }
1761
1762         bond_compute_features(bond);
1763         if (!(bond_dev->features & NETIF_F_VLAN_CHALLENGED) &&
1764             (old_features & NETIF_F_VLAN_CHALLENGED))
1765                 netdev_info(bond_dev, "last VLAN challenged slave %s left bond %s - VLAN blocking is removed\n",
1766                             slave_dev->name, bond_dev->name);
1767
1768         /* must do this from outside any spinlocks */
1769         vlan_vids_del_by_dev(slave_dev, bond_dev);
1770
1771         /* If the mode uses primary, then this cases was handled above by
1772          * bond_change_active_slave(..., NULL)
1773          */
1774         if (!bond_uses_primary(bond)) {
1775                 /* unset promiscuity level from slave
1776                  * NOTE: The NETDEV_CHANGEADDR call above may change the value
1777                  * of the IFF_PROMISC flag in the bond_dev, but we need the
1778                  * value of that flag before that change, as that was the value
1779                  * when this slave was attached, so we cache at the start of the
1780                  * function and use it here. Same goes for ALLMULTI below
1781                  */
1782                 if (old_flags & IFF_PROMISC)
1783                         dev_set_promiscuity(slave_dev, -1);
1784
1785                 /* unset allmulti level from slave */
1786                 if (old_flags & IFF_ALLMULTI)
1787                         dev_set_allmulti(slave_dev, -1);
1788
1789                 bond_hw_addr_flush(bond_dev, slave_dev);
1790         }
1791
1792         slave_disable_netpoll(slave);
1793
1794         /* close slave before restoring its mac address */
1795         dev_close(slave_dev);
1796
1797         if (bond->params.fail_over_mac != BOND_FOM_ACTIVE ||
1798             BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1799                 /* restore original ("permanent") mac address */
1800                 ether_addr_copy(addr.sa_data, slave->perm_hwaddr);
1801                 addr.sa_family = slave_dev->type;
1802                 dev_set_mac_address(slave_dev, &addr);
1803         }
1804
1805         dev_set_mtu(slave_dev, slave->original_mtu);
1806
1807         slave_dev->priv_flags &= ~IFF_BONDING;
1808
1809         bond_free_slave(slave);
1810
1811         return 0;  /* deletion OK */
1812 }
1813
1814 /* A wrapper used because of ndo_del_link */
1815 int bond_release(struct net_device *bond_dev, struct net_device *slave_dev)
1816 {
1817         return __bond_release_one(bond_dev, slave_dev, false);
1818 }
1819
1820 /*
1821 * First release a slave and then destroy the bond if no more slaves are left.
1822 * Must be under rtnl_lock when this function is called.
1823 */
1824 static int  bond_release_and_destroy(struct net_device *bond_dev,
1825                                      struct net_device *slave_dev)
1826 {
1827         struct bonding *bond = netdev_priv(bond_dev);
1828         int ret;
1829
1830         ret = bond_release(bond_dev, slave_dev);
1831         if (ret == 0 && !bond_has_slaves(bond)) {
1832                 bond_dev->priv_flags |= IFF_DISABLE_NETPOLL;
1833                 netdev_info(bond_dev, "Destroying bond %s\n",
1834                             bond_dev->name);
1835                 unregister_netdevice(bond_dev);
1836         }
1837         return ret;
1838 }
1839
1840 static int bond_info_query(struct net_device *bond_dev, struct ifbond *info)
1841 {
1842         struct bonding *bond = netdev_priv(bond_dev);
1843
1844         info->bond_mode = BOND_MODE(bond);
1845         info->miimon = bond->params.miimon;
1846
1847         info->num_slaves = bond->slave_cnt;
1848
1849         return 0;
1850 }
1851
1852 static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *info)
1853 {
1854         struct bonding *bond = netdev_priv(bond_dev);
1855         struct list_head *iter;
1856         int i = 0, res = -ENODEV;
1857         struct slave *slave;
1858
1859         bond_for_each_slave(bond, slave, iter) {
1860                 if (i++ == (int)info->slave_id) {
1861                         res = 0;
1862                         strcpy(info->slave_name, slave->dev->name);
1863                         info->link = slave->link;
1864                         info->state = bond_slave_state(slave);
1865                         info->link_failure_count = slave->link_failure_count;
1866                         break;
1867                 }
1868         }
1869
1870         return res;
1871 }
1872
1873 /*-------------------------------- Monitoring -------------------------------*/
1874
1875 /* called with rcu_read_lock() */
1876 static int bond_miimon_inspect(struct bonding *bond)
1877 {
1878         int link_state, commit = 0;
1879         struct list_head *iter;
1880         struct slave *slave;
1881         bool ignore_updelay;
1882
1883         ignore_updelay = !rcu_dereference(bond->curr_active_slave);
1884
1885         bond_for_each_slave_rcu(bond, slave, iter) {
1886                 slave->new_link = BOND_LINK_NOCHANGE;
1887
1888                 link_state = bond_check_dev_link(bond, slave->dev, 0);
1889
1890                 switch (slave->link) {
1891                 case BOND_LINK_UP:
1892                         if (link_state)
1893                                 continue;
1894
1895                         slave->link = BOND_LINK_FAIL;
1896                         slave->delay = bond->params.downdelay;
1897                         if (slave->delay) {
1898                                 netdev_info(bond->dev, "link status down for %sinterface %s, disabling it in %d ms\n",
1899                                             (BOND_MODE(bond) ==
1900                                              BOND_MODE_ACTIVEBACKUP) ?
1901                                              (bond_is_active_slave(slave) ?
1902                                               "active " : "backup ") : "",
1903                                             slave->dev->name,
1904                                             bond->params.downdelay * bond->params.miimon);
1905                         }
1906                         /*FALLTHRU*/
1907                 case BOND_LINK_FAIL:
1908                         if (link_state) {
1909                                 /*
1910                                  * recovered before downdelay expired
1911                                  */
1912                                 slave->link = BOND_LINK_UP;
1913                                 slave->last_link_up = jiffies;
1914                                 netdev_info(bond->dev, "link status up again after %d ms for interface %s\n",
1915                                             (bond->params.downdelay - slave->delay) *
1916                                             bond->params.miimon,
1917                                             slave->dev->name);
1918                                 continue;
1919                         }
1920
1921                         if (slave->delay <= 0) {
1922                                 slave->new_link = BOND_LINK_DOWN;
1923                                 commit++;
1924                                 continue;
1925                         }
1926
1927                         slave->delay--;
1928                         break;
1929
1930                 case BOND_LINK_DOWN:
1931                         if (!link_state)
1932                                 continue;
1933
1934                         slave->link = BOND_LINK_BACK;
1935                         slave->delay = bond->params.updelay;
1936
1937                         if (slave->delay) {
1938                                 netdev_info(bond->dev, "link status up for interface %s, enabling it in %d ms\n",
1939                                             slave->dev->name,
1940                                             ignore_updelay ? 0 :
1941                                             bond->params.updelay *
1942                                             bond->params.miimon);
1943                         }
1944                         /*FALLTHRU*/
1945                 case BOND_LINK_BACK:
1946                         if (!link_state) {
1947                                 slave->link = BOND_LINK_DOWN;
1948                                 netdev_info(bond->dev, "link status down again after %d ms for interface %s\n",
1949                                             (bond->params.updelay - slave->delay) *
1950                                             bond->params.miimon,
1951                                             slave->dev->name);
1952
1953                                 continue;
1954                         }
1955
1956                         if (ignore_updelay)
1957                                 slave->delay = 0;
1958
1959                         if (slave->delay <= 0) {
1960                                 slave->new_link = BOND_LINK_UP;
1961                                 commit++;
1962                                 ignore_updelay = false;
1963                                 continue;
1964                         }
1965
1966                         slave->delay--;
1967                         break;
1968                 }
1969         }
1970
1971         return commit;
1972 }
1973
1974 static void bond_miimon_commit(struct bonding *bond)
1975 {
1976         struct list_head *iter;
1977         struct slave *slave;
1978
1979         bond_for_each_slave(bond, slave, iter) {
1980                 switch (slave->new_link) {
1981                 case BOND_LINK_NOCHANGE:
1982                         continue;
1983
1984                 case BOND_LINK_UP:
1985                         slave->link = BOND_LINK_UP;
1986                         slave->last_link_up = jiffies;
1987
1988                         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
1989                                 /* prevent it from being the active one */
1990                                 bond_set_backup_slave(slave);
1991                         } else if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
1992                                 /* make it immediately active */
1993                                 bond_set_active_slave(slave);
1994                         } else if (slave != bond->primary_slave) {
1995                                 /* prevent it from being the active one */
1996                                 bond_set_backup_slave(slave);
1997                         }
1998
1999                         netdev_info(bond->dev, "link status definitely up for interface %s, %u Mbps %s duplex\n",
2000                                     slave->dev->name,
2001                                     slave->speed == SPEED_UNKNOWN ? 0 : slave->speed,
2002                                     slave->duplex ? "full" : "half");
2003
2004                         /* notify ad that the link status has changed */
2005                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2006                                 bond_3ad_handle_link_change(slave, BOND_LINK_UP);
2007
2008                         if (bond_is_lb(bond))
2009                                 bond_alb_handle_link_change(bond, slave,
2010                                                             BOND_LINK_UP);
2011
2012                         if (!bond->curr_active_slave ||
2013                             (slave == bond->primary_slave))
2014                                 goto do_failover;
2015
2016                         continue;
2017
2018                 case BOND_LINK_DOWN:
2019                         if (slave->link_failure_count < UINT_MAX)
2020                                 slave->link_failure_count++;
2021
2022                         slave->link = BOND_LINK_DOWN;
2023
2024                         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP ||
2025                             BOND_MODE(bond) == BOND_MODE_8023AD)
2026                                 bond_set_slave_inactive_flags(slave,
2027                                                               BOND_SLAVE_NOTIFY_NOW);
2028
2029                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2030                                     slave->dev->name);
2031
2032                         if (BOND_MODE(bond) == BOND_MODE_8023AD)
2033                                 bond_3ad_handle_link_change(slave,
2034                                                             BOND_LINK_DOWN);
2035
2036                         if (bond_is_lb(bond))
2037                                 bond_alb_handle_link_change(bond, slave,
2038                                                             BOND_LINK_DOWN);
2039
2040                         if (slave == rcu_access_pointer(bond->curr_active_slave))
2041                                 goto do_failover;
2042
2043                         continue;
2044
2045                 default:
2046                         netdev_err(bond->dev, "invalid new link %d on slave %s\n",
2047                                    slave->new_link, slave->dev->name);
2048                         slave->new_link = BOND_LINK_NOCHANGE;
2049
2050                         continue;
2051                 }
2052
2053 do_failover:
2054                 ASSERT_RTNL();
2055                 block_netpoll_tx();
2056                 write_lock_bh(&bond->curr_slave_lock);
2057                 bond_select_active_slave(bond);
2058                 write_unlock_bh(&bond->curr_slave_lock);
2059                 unblock_netpoll_tx();
2060         }
2061
2062         bond_set_carrier(bond);
2063 }
2064
2065 /*
2066  * bond_mii_monitor
2067  *
2068  * Really a wrapper that splits the mii monitor into two phases: an
2069  * inspection, then (if inspection indicates something needs to be done)
2070  * an acquisition of appropriate locks followed by a commit phase to
2071  * implement whatever link state changes are indicated.
2072  */
2073 static void bond_mii_monitor(struct work_struct *work)
2074 {
2075         struct bonding *bond = container_of(work, struct bonding,
2076                                             mii_work.work);
2077         bool should_notify_peers = false;
2078         unsigned long delay;
2079
2080         delay = msecs_to_jiffies(bond->params.miimon);
2081
2082         if (!bond_has_slaves(bond))
2083                 goto re_arm;
2084
2085         rcu_read_lock();
2086
2087         should_notify_peers = bond_should_notify_peers(bond);
2088
2089         if (bond_miimon_inspect(bond)) {
2090                 rcu_read_unlock();
2091
2092                 /* Race avoidance with bond_close cancel of workqueue */
2093                 if (!rtnl_trylock()) {
2094                         delay = 1;
2095                         should_notify_peers = false;
2096                         goto re_arm;
2097                 }
2098
2099                 bond_miimon_commit(bond);
2100
2101                 rtnl_unlock();  /* might sleep, hold no other locks */
2102         } else
2103                 rcu_read_unlock();
2104
2105 re_arm:
2106         if (bond->params.miimon)
2107                 queue_delayed_work(bond->wq, &bond->mii_work, delay);
2108
2109         if (should_notify_peers) {
2110                 if (!rtnl_trylock())
2111                         return;
2112                 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, bond->dev);
2113                 rtnl_unlock();
2114         }
2115 }
2116
2117 static bool bond_has_this_ip(struct bonding *bond, __be32 ip)
2118 {
2119         struct net_device *upper;
2120         struct list_head *iter;
2121         bool ret = false;
2122
2123         if (ip == bond_confirm_addr(bond->dev, 0, ip))
2124                 return true;
2125
2126         rcu_read_lock();
2127         netdev_for_each_all_upper_dev_rcu(bond->dev, upper, iter) {
2128                 if (ip == bond_confirm_addr(upper, 0, ip)) {
2129                         ret = true;
2130                         break;
2131                 }
2132         }
2133         rcu_read_unlock();
2134
2135         return ret;
2136 }
2137
2138 /*
2139  * We go to the (large) trouble of VLAN tagging ARP frames because
2140  * switches in VLAN mode (especially if ports are configured as
2141  * "native" to a VLAN) might not pass non-tagged frames.
2142  */
2143 static void bond_arp_send(struct net_device *slave_dev, int arp_op,
2144                           __be32 dest_ip, __be32 src_ip,
2145                           struct bond_vlan_tag *tags)
2146 {
2147         struct sk_buff *skb;
2148         struct bond_vlan_tag *outer_tag = tags;
2149
2150         netdev_dbg(slave_dev, "arp %d on slave %s: dst %pI4 src %pI4\n",
2151                    arp_op, slave_dev->name, &dest_ip, &src_ip);
2152
2153         skb = arp_create(arp_op, ETH_P_ARP, dest_ip, slave_dev, src_ip,
2154                          NULL, slave_dev->dev_addr, NULL);
2155
2156         if (!skb) {
2157                 net_err_ratelimited("ARP packet allocation failed\n");
2158                 return;
2159         }
2160
2161         if (!tags || tags->vlan_proto == VLAN_N_VID)
2162                 goto xmit;
2163
2164         tags++;
2165
2166         /* Go through all the tags backwards and add them to the packet */
2167         while (tags->vlan_proto != VLAN_N_VID) {
2168                 if (!tags->vlan_id) {
2169                         tags++;
2170                         continue;
2171                 }
2172
2173                 netdev_dbg(slave_dev, "inner tag: proto %X vid %X\n",
2174                            ntohs(outer_tag->vlan_proto), tags->vlan_id);
2175                 skb = __vlan_put_tag(skb, tags->vlan_proto,
2176                                      tags->vlan_id);
2177                 if (!skb) {
2178                         net_err_ratelimited("failed to insert inner VLAN tag\n");
2179                         return;
2180                 }
2181
2182                 tags++;
2183         }
2184         /* Set the outer tag */
2185         if (outer_tag->vlan_id) {
2186                 netdev_dbg(slave_dev, "outer tag: proto %X vid %X\n",
2187                            ntohs(outer_tag->vlan_proto), outer_tag->vlan_id);
2188                 skb = vlan_put_tag(skb, outer_tag->vlan_proto,
2189                                    outer_tag->vlan_id);
2190                 if (!skb) {
2191                         net_err_ratelimited("failed to insert outer VLAN tag\n");
2192                         return;
2193                 }
2194         }
2195
2196 xmit:
2197         arp_xmit(skb);
2198 }
2199
2200 /* Validate the device path between the @start_dev and the @end_dev.
2201  * The path is valid if the @end_dev is reachable through device
2202  * stacking.
2203  * When the path is validated, collect any vlan information in the
2204  * path.
2205  */
2206 struct bond_vlan_tag *bond_verify_device_path(struct net_device *start_dev,
2207                                               struct net_device *end_dev,
2208                                               int level)
2209 {
2210         struct bond_vlan_tag *tags;
2211         struct net_device *upper;
2212         struct list_head  *iter;
2213
2214         if (start_dev == end_dev) {
2215                 tags = kzalloc(sizeof(*tags) * (level + 1), GFP_ATOMIC);
2216                 if (!tags)
2217                         return ERR_PTR(-ENOMEM);
2218                 tags[level].vlan_proto = VLAN_N_VID;
2219                 return tags;
2220         }
2221
2222         netdev_for_each_upper_dev_rcu(start_dev, upper, iter) {
2223                 tags = bond_verify_device_path(upper, end_dev, level + 1);
2224                 if (IS_ERR_OR_NULL(tags)) {
2225                         if (IS_ERR(tags))
2226                                 return tags;
2227                         continue;
2228                 }
2229                 if (is_vlan_dev(upper)) {
2230                         tags[level].vlan_proto = vlan_dev_vlan_proto(upper);
2231                         tags[level].vlan_id = vlan_dev_vlan_id(upper);
2232                 }
2233
2234                 return tags;
2235         }
2236
2237         return NULL;
2238 }
2239
2240 static void bond_arp_send_all(struct bonding *bond, struct slave *slave)
2241 {
2242         struct rtable *rt;
2243         struct bond_vlan_tag *tags;
2244         __be32 *targets = bond->params.arp_targets, addr;
2245         int i;
2246
2247         for (i = 0; i < BOND_MAX_ARP_TARGETS && targets[i]; i++) {
2248                 netdev_dbg(bond->dev, "basa: target %pI4\n", &targets[i]);
2249                 tags = NULL;
2250
2251                 /* Find out through which dev should the packet go */
2252                 rt = ip_route_output(dev_net(bond->dev), targets[i], 0,
2253                                      RTO_ONLINK, 0);
2254                 if (IS_ERR(rt)) {
2255                         /* there's no route to target - try to send arp
2256                          * probe to generate any traffic (arp_validate=0)
2257                          */
2258                         if (bond->params.arp_validate)
2259                                 net_warn_ratelimited("%s: no route to arp_ip_target %pI4 and arp_validate is set\n",
2260                                                      bond->dev->name,
2261                                                      &targets[i]);
2262                         bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2263                                       0, tags);
2264                         continue;
2265                 }
2266
2267                 /* bond device itself */
2268                 if (rt->dst.dev == bond->dev)
2269                         goto found;
2270
2271                 rcu_read_lock();
2272                 tags = bond_verify_device_path(bond->dev, rt->dst.dev, 0);
2273                 rcu_read_unlock();
2274
2275                 if (!IS_ERR_OR_NULL(tags))
2276                         goto found;
2277
2278                 /* Not our device - skip */
2279                 netdev_dbg(bond->dev, "no path to arp_ip_target %pI4 via rt.dev %s\n",
2280                            &targets[i], rt->dst.dev ? rt->dst.dev->name : "NULL");
2281
2282                 ip_rt_put(rt);
2283                 continue;
2284
2285 found:
2286                 addr = bond_confirm_addr(rt->dst.dev, targets[i], 0);
2287                 ip_rt_put(rt);
2288                 bond_arp_send(slave->dev, ARPOP_REQUEST, targets[i],
2289                               addr, tags);
2290                 kfree(tags);
2291         }
2292 }
2293
2294 static void bond_validate_arp(struct bonding *bond, struct slave *slave, __be32 sip, __be32 tip)
2295 {
2296         int i;
2297
2298         if (!sip || !bond_has_this_ip(bond, tip)) {
2299                 netdev_dbg(bond->dev, "bva: sip %pI4 tip %pI4 not found\n",
2300                            &sip, &tip);
2301                 return;
2302         }
2303
2304         i = bond_get_targets_ip(bond->params.arp_targets, sip);
2305         if (i == -1) {
2306                 netdev_dbg(bond->dev, "bva: sip %pI4 not found in targets\n",
2307                            &sip);
2308                 return;
2309         }
2310         slave->last_rx = jiffies;
2311         slave->target_last_arp_rx[i] = jiffies;
2312 }
2313
2314 int bond_arp_rcv(const struct sk_buff *skb, struct bonding *bond,
2315                  struct slave *slave)
2316 {
2317         struct arphdr *arp = (struct arphdr *)skb->data;
2318         struct slave *curr_active_slave;
2319         unsigned char *arp_ptr;
2320         __be32 sip, tip;
2321         int alen, is_arp = skb->protocol == __cpu_to_be16(ETH_P_ARP);
2322
2323         if (!slave_do_arp_validate(bond, slave)) {
2324                 if ((slave_do_arp_validate_only(bond) && is_arp) ||
2325                     !slave_do_arp_validate_only(bond))
2326                         slave->last_rx = jiffies;
2327                 return RX_HANDLER_ANOTHER;
2328         } else if (!is_arp) {
2329                 return RX_HANDLER_ANOTHER;
2330         }
2331
2332         alen = arp_hdr_len(bond->dev);
2333
2334         netdev_dbg(bond->dev, "bond_arp_rcv: skb->dev %s\n",
2335                    skb->dev->name);
2336
2337         if (alen > skb_headlen(skb)) {
2338                 arp = kmalloc(alen, GFP_ATOMIC);
2339                 if (!arp)
2340                         goto out_unlock;
2341                 if (skb_copy_bits(skb, 0, arp, alen) < 0)
2342                         goto out_unlock;
2343         }
2344
2345         if (arp->ar_hln != bond->dev->addr_len ||
2346             skb->pkt_type == PACKET_OTHERHOST ||
2347             skb->pkt_type == PACKET_LOOPBACK ||
2348             arp->ar_hrd != htons(ARPHRD_ETHER) ||
2349             arp->ar_pro != htons(ETH_P_IP) ||
2350             arp->ar_pln != 4)
2351                 goto out_unlock;
2352
2353         arp_ptr = (unsigned char *)(arp + 1);
2354         arp_ptr += bond->dev->addr_len;
2355         memcpy(&sip, arp_ptr, 4);
2356         arp_ptr += 4 + bond->dev->addr_len;
2357         memcpy(&tip, arp_ptr, 4);
2358
2359         netdev_dbg(bond->dev, "bond_arp_rcv: %s/%d av %d sv %d sip %pI4 tip %pI4\n",
2360                    slave->dev->name, bond_slave_state(slave),
2361                      bond->params.arp_validate, slave_do_arp_validate(bond, slave),
2362                      &sip, &tip);
2363
2364         curr_active_slave = rcu_dereference(bond->curr_active_slave);
2365
2366         /*
2367          * Backup slaves won't see the ARP reply, but do come through
2368          * here for each ARP probe (so we swap the sip/tip to validate
2369          * the probe).  In a "redundant switch, common router" type of
2370          * configuration, the ARP probe will (hopefully) travel from
2371          * the active, through one switch, the router, then the other
2372          * switch before reaching the backup.
2373          *
2374          * We 'trust' the arp requests if there is an active slave and
2375          * it received valid arp reply(s) after it became active. This
2376          * is done to avoid endless looping when we can't reach the
2377          * arp_ip_target and fool ourselves with our own arp requests.
2378          */
2379
2380         if (bond_is_active_slave(slave))
2381                 bond_validate_arp(bond, slave, sip, tip);
2382         else if (curr_active_slave &&
2383                  time_after(slave_last_rx(bond, curr_active_slave),
2384                             curr_active_slave->last_link_up))
2385                 bond_validate_arp(bond, slave, tip, sip);
2386
2387 out_unlock:
2388         if (arp != (struct arphdr *)skb->data)
2389                 kfree(arp);
2390         return RX_HANDLER_ANOTHER;
2391 }
2392
2393 /* function to verify if we're in the arp_interval timeslice, returns true if
2394  * (last_act - arp_interval) <= jiffies <= (last_act + mod * arp_interval +
2395  * arp_interval/2) . the arp_interval/2 is needed for really fast networks.
2396  */
2397 static bool bond_time_in_interval(struct bonding *bond, unsigned long last_act,
2398                                   int mod)
2399 {
2400         int delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2401
2402         return time_in_range(jiffies,
2403                              last_act - delta_in_ticks,
2404                              last_act + mod * delta_in_ticks + delta_in_ticks/2);
2405 }
2406
2407 /*
2408  * this function is called regularly to monitor each slave's link
2409  * ensuring that traffic is being sent and received when arp monitoring
2410  * is used in load-balancing mode. if the adapter has been dormant, then an
2411  * arp is transmitted to generate traffic. see activebackup_arp_monitor for
2412  * arp monitoring in active backup mode.
2413  */
2414 static void bond_loadbalance_arp_mon(struct work_struct *work)
2415 {
2416         struct bonding *bond = container_of(work, struct bonding,
2417                                             arp_work.work);
2418         struct slave *slave, *oldcurrent;
2419         struct list_head *iter;
2420         int do_failover = 0, slave_state_changed = 0;
2421
2422         if (!bond_has_slaves(bond))
2423                 goto re_arm;
2424
2425         rcu_read_lock();
2426
2427         oldcurrent = rcu_dereference(bond->curr_active_slave);
2428         /* see if any of the previous devices are up now (i.e. they have
2429          * xmt and rcv traffic). the curr_active_slave does not come into
2430          * the picture unless it is null. also, slave->last_link_up is not
2431          * needed here because we send an arp on each slave and give a slave
2432          * as long as it needs to get the tx/rx within the delta.
2433          * TODO: what about up/down delay in arp mode? it wasn't here before
2434          *       so it can wait
2435          */
2436         bond_for_each_slave_rcu(bond, slave, iter) {
2437                 unsigned long trans_start = dev_trans_start(slave->dev);
2438
2439                 if (slave->link != BOND_LINK_UP) {
2440                         if (bond_time_in_interval(bond, trans_start, 1) &&
2441                             bond_time_in_interval(bond, slave->last_rx, 1)) {
2442
2443                                 slave->link  = BOND_LINK_UP;
2444                                 slave_state_changed = 1;
2445
2446                                 /* primary_slave has no meaning in round-robin
2447                                  * mode. the window of a slave being up and
2448                                  * curr_active_slave being null after enslaving
2449                                  * is closed.
2450                                  */
2451                                 if (!oldcurrent) {
2452                                         netdev_info(bond->dev, "link status definitely up for interface %s\n",
2453                                                     slave->dev->name);
2454                                         do_failover = 1;
2455                                 } else {
2456                                         netdev_info(bond->dev, "interface %s is now up\n",
2457                                                     slave->dev->name);
2458                                 }
2459                         }
2460                 } else {
2461                         /* slave->link == BOND_LINK_UP */
2462
2463                         /* not all switches will respond to an arp request
2464                          * when the source ip is 0, so don't take the link down
2465                          * if we don't know our ip yet
2466                          */
2467                         if (!bond_time_in_interval(bond, trans_start, 2) ||
2468                             !bond_time_in_interval(bond, slave->last_rx, 2)) {
2469
2470                                 slave->link  = BOND_LINK_DOWN;
2471                                 slave_state_changed = 1;
2472
2473                                 if (slave->link_failure_count < UINT_MAX)
2474                                         slave->link_failure_count++;
2475
2476                                 netdev_info(bond->dev, "interface %s is now down\n",
2477                                             slave->dev->name);
2478
2479                                 if (slave == oldcurrent)
2480                                         do_failover = 1;
2481                         }
2482                 }
2483
2484                 /* note: if switch is in round-robin mode, all links
2485                  * must tx arp to ensure all links rx an arp - otherwise
2486                  * links may oscillate or not come up at all; if switch is
2487                  * in something like xor mode, there is nothing we can
2488                  * do - all replies will be rx'ed on same link causing slaves
2489                  * to be unstable during low/no traffic periods
2490                  */
2491                 if (bond_slave_is_up(slave))
2492                         bond_arp_send_all(bond, slave);
2493         }
2494
2495         rcu_read_unlock();
2496
2497         if (do_failover || slave_state_changed) {
2498                 if (!rtnl_trylock())
2499                         goto re_arm;
2500
2501                 if (slave_state_changed) {
2502                         bond_slave_state_change(bond);
2503                 } else if (do_failover) {
2504                         /* the bond_select_active_slave must hold RTNL
2505                          * and curr_slave_lock for write.
2506                          */
2507                         block_netpoll_tx();
2508                         write_lock_bh(&bond->curr_slave_lock);
2509
2510                         bond_select_active_slave(bond);
2511
2512                         write_unlock_bh(&bond->curr_slave_lock);
2513                         unblock_netpoll_tx();
2514                 }
2515                 rtnl_unlock();
2516         }
2517
2518 re_arm:
2519         if (bond->params.arp_interval)
2520                 queue_delayed_work(bond->wq, &bond->arp_work,
2521                                    msecs_to_jiffies(bond->params.arp_interval));
2522 }
2523
2524 /*
2525  * Called to inspect slaves for active-backup mode ARP monitor link state
2526  * changes.  Sets new_link in slaves to specify what action should take
2527  * place for the slave.  Returns 0 if no changes are found, >0 if changes
2528  * to link states must be committed.
2529  *
2530  * Called with rcu_read_lock hold.
2531  */
2532 static int bond_ab_arp_inspect(struct bonding *bond)
2533 {
2534         unsigned long trans_start, last_rx;
2535         struct list_head *iter;
2536         struct slave *slave;
2537         int commit = 0;
2538
2539         bond_for_each_slave_rcu(bond, slave, iter) {
2540                 slave->new_link = BOND_LINK_NOCHANGE;
2541                 last_rx = slave_last_rx(bond, slave);
2542
2543                 if (slave->link != BOND_LINK_UP) {
2544                         if (bond_time_in_interval(bond, last_rx, 1)) {
2545                                 slave->new_link = BOND_LINK_UP;
2546                                 commit++;
2547                         }
2548                         continue;
2549                 }
2550
2551                 /*
2552                  * Give slaves 2*delta after being enslaved or made
2553                  * active.  This avoids bouncing, as the last receive
2554                  * times need a full ARP monitor cycle to be updated.
2555                  */
2556                 if (bond_time_in_interval(bond, slave->last_link_up, 2))
2557                         continue;
2558
2559                 /*
2560                  * Backup slave is down if:
2561                  * - No current_arp_slave AND
2562                  * - more than 3*delta since last receive AND
2563                  * - the bond has an IP address
2564                  *
2565                  * Note: a non-null current_arp_slave indicates
2566                  * the curr_active_slave went down and we are
2567                  * searching for a new one; under this condition
2568                  * we only take the curr_active_slave down - this
2569                  * gives each slave a chance to tx/rx traffic
2570                  * before being taken out
2571                  */
2572                 if (!bond_is_active_slave(slave) &&
2573                     !rcu_access_pointer(bond->current_arp_slave) &&
2574                     !bond_time_in_interval(bond, last_rx, 3)) {
2575                         slave->new_link = BOND_LINK_DOWN;
2576                         commit++;
2577                 }
2578
2579                 /*
2580                  * Active slave is down if:
2581                  * - more than 2*delta since transmitting OR
2582                  * - (more than 2*delta since receive AND
2583                  *    the bond has an IP address)
2584                  */
2585                 trans_start = dev_trans_start(slave->dev);
2586                 if (bond_is_active_slave(slave) &&
2587                     (!bond_time_in_interval(bond, trans_start, 2) ||
2588                      !bond_time_in_interval(bond, last_rx, 2))) {
2589                         slave->new_link = BOND_LINK_DOWN;
2590                         commit++;
2591                 }
2592         }
2593
2594         return commit;
2595 }
2596
2597 /*
2598  * Called to commit link state changes noted by inspection step of
2599  * active-backup mode ARP monitor.
2600  *
2601  * Called with RTNL hold.
2602  */
2603 static void bond_ab_arp_commit(struct bonding *bond)
2604 {
2605         unsigned long trans_start;
2606         struct list_head *iter;
2607         struct slave *slave;
2608
2609         bond_for_each_slave(bond, slave, iter) {
2610                 switch (slave->new_link) {
2611                 case BOND_LINK_NOCHANGE:
2612                         continue;
2613
2614                 case BOND_LINK_UP:
2615                         trans_start = dev_trans_start(slave->dev);
2616                         if (rtnl_dereference(bond->curr_active_slave) != slave ||
2617                             (!rtnl_dereference(bond->curr_active_slave) &&
2618                              bond_time_in_interval(bond, trans_start, 1))) {
2619                                 struct slave *current_arp_slave;
2620
2621                                 current_arp_slave = rtnl_dereference(bond->current_arp_slave);
2622                                 slave->link = BOND_LINK_UP;
2623                                 if (current_arp_slave) {
2624                                         bond_set_slave_inactive_flags(
2625                                                 current_arp_slave,
2626                                                 BOND_SLAVE_NOTIFY_NOW);
2627                                         RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2628                                 }
2629
2630                                 netdev_info(bond->dev, "link status definitely up for interface %s\n",
2631                                             slave->dev->name);
2632
2633                                 if (!rtnl_dereference(bond->curr_active_slave) ||
2634                                     (slave == bond->primary_slave))
2635                                         goto do_failover;
2636
2637                         }
2638
2639                         continue;
2640
2641                 case BOND_LINK_DOWN:
2642                         if (slave->link_failure_count < UINT_MAX)
2643                                 slave->link_failure_count++;
2644
2645                         slave->link = BOND_LINK_DOWN;
2646                         bond_set_slave_inactive_flags(slave,
2647                                                       BOND_SLAVE_NOTIFY_NOW);
2648
2649                         netdev_info(bond->dev, "link status definitely down for interface %s, disabling it\n",
2650                                     slave->dev->name);
2651
2652                         if (slave == rtnl_dereference(bond->curr_active_slave)) {
2653                                 RCU_INIT_POINTER(bond->current_arp_slave, NULL);
2654                                 goto do_failover;
2655                         }
2656
2657                         continue;
2658
2659                 default:
2660                         netdev_err(bond->dev, "impossible: new_link %d on slave %s\n",
2661                                    slave->new_link, slave->dev->name);
2662                         continue;
2663                 }
2664
2665 do_failover:
2666                 ASSERT_RTNL();
2667                 block_netpoll_tx();
2668                 write_lock_bh(&bond->curr_slave_lock);
2669                 bond_select_active_slave(bond);
2670                 write_unlock_bh(&bond->curr_slave_lock);
2671                 unblock_netpoll_tx();
2672         }
2673
2674         bond_set_carrier(bond);
2675 }
2676
2677 /*
2678  * Send ARP probes for active-backup mode ARP monitor.
2679  *
2680  * Called with rcu_read_lock hold.
2681  */
2682 static bool bond_ab_arp_probe(struct bonding *bond)
2683 {
2684         struct slave *slave, *before = NULL, *new_slave = NULL,
2685                      *curr_arp_slave = rcu_dereference(bond->current_arp_slave),
2686                      *curr_active_slave = rcu_dereference(bond->curr_active_slave);
2687         struct list_head *iter;
2688         bool found = false;
2689         bool should_notify_rtnl = BOND_SLAVE_NOTIFY_LATER;
2690
2691         if (curr_arp_slave && curr_active_slave)
2692                 netdev_info(bond->dev, "PROBE: c_arp %s && cas %s BAD\n",
2693                             curr_arp_slave->dev->name,
2694                             curr_active_slave->dev->name);
2695
2696         if (curr_active_slave) {
2697                 bond_arp_send_all(bond, curr_active_slave);
2698                 return should_notify_rtnl;
2699         }
2700
2701         /* if we don't have a curr_active_slave, search for the next available
2702          * backup slave from the current_arp_slave and make it the candidate
2703          * for becoming the curr_active_slave
2704          */
2705
2706         if (!curr_arp_slave) {
2707                 curr_arp_slave = bond_first_slave_rcu(bond);
2708                 if (!curr_arp_slave)
2709                         return should_notify_rtnl;
2710         }
2711
2712         bond_set_slave_inactive_flags(curr_arp_slave, BOND_SLAVE_NOTIFY_LATER);
2713
2714         bond_for_each_slave_rcu(bond, slave, iter) {
2715                 if (!found && !before && bond_slave_is_up(slave))
2716                         before = slave;
2717
2718                 if (found && !new_slave && bond_slave_is_up(slave))
2719                         new_slave = slave;
2720                 /* if the link state is up at this point, we
2721                  * mark it down - this can happen if we have
2722                  * simultaneous link failures and
2723                  * reselect_active_interface doesn't make this
2724                  * one the current slave so it is still marked
2725                  * up when it is actually down
2726                  */
2727                 if (!bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
2728                         slave->link = BOND_LINK_DOWN;
2729                         if (slave->link_failure_count < UINT_MAX)
2730                                 slave->link_failure_count++;
2731
2732                         bond_set_slave_inactive_flags(slave,
2733                                                       BOND_SLAVE_NOTIFY_LATER);
2734
2735                         netdev_info(bond->dev, "backup interface %s is now down\n",
2736                                     slave->dev->name);
2737                 }
2738                 if (slave == curr_arp_slave)
2739                         found = true;
2740         }
2741
2742         if (!new_slave && before)
2743                 new_slave = before;
2744
2745         if (!new_slave)
2746                 goto check_state;
2747
2748         new_slave->link = BOND_LINK_BACK;
2749         bond_set_slave_active_flags(new_slave, BOND_SLAVE_NOTIFY_LATER);
2750         bond_arp_send_all(bond, new_slave);
2751         new_slave->last_link_up = jiffies;
2752         rcu_assign_pointer(bond->current_arp_slave, new_slave);
2753
2754 check_state:
2755         bond_for_each_slave_rcu(bond, slave, iter) {
2756                 if (slave->should_notify) {
2757                         should_notify_rtnl = BOND_SLAVE_NOTIFY_NOW;
2758                         break;
2759                 }
2760         }
2761         return should_notify_rtnl;
2762 }
2763
2764 static void bond_activebackup_arp_mon(struct work_struct *work)
2765 {
2766         struct bonding *bond = container_of(work, struct bonding,
2767                                             arp_work.work);
2768         bool should_notify_peers = false;
2769         bool should_notify_rtnl = false;
2770         int delta_in_ticks;
2771
2772         delta_in_ticks = msecs_to_jiffies(bond->params.arp_interval);
2773
2774         if (!bond_has_slaves(bond))
2775                 goto re_arm;
2776
2777         rcu_read_lock();
2778
2779         should_notify_peers = bond_should_notify_peers(bond);
2780
2781         if (bond_ab_arp_inspect(bond)) {
2782                 rcu_read_unlock();
2783
2784                 /* Race avoidance with bond_close flush of workqueue */
2785                 if (!rtnl_trylock()) {
2786                         delta_in_ticks = 1;
2787                         should_notify_peers = false;
2788                         goto re_arm;
2789                 }
2790
2791                 bond_ab_arp_commit(bond);
2792
2793                 rtnl_unlock();
2794                 rcu_read_lock();
2795         }
2796
2797         should_notify_rtnl = bond_ab_arp_probe(bond);
2798         rcu_read_unlock();
2799
2800 re_arm:
2801         if (bond->params.arp_interval)
2802                 queue_delayed_work(bond->wq, &bond->arp_work, delta_in_ticks);
2803
2804         if (should_notify_peers || should_notify_rtnl) {
2805                 if (!rtnl_trylock())
2806                         return;
2807
2808                 if (should_notify_peers)
2809                         call_netdevice_notifiers(NETDEV_NOTIFY_PEERS,
2810                                                  bond->dev);
2811                 if (should_notify_rtnl)
2812                         bond_slave_state_notify(bond);
2813
2814                 rtnl_unlock();
2815         }
2816 }
2817
2818 /*-------------------------- netdev event handling --------------------------*/
2819
2820 /*
2821  * Change device name
2822  */
2823 static int bond_event_changename(struct bonding *bond)
2824 {
2825         bond_remove_proc_entry(bond);
2826         bond_create_proc_entry(bond);
2827
2828         bond_debug_reregister(bond);
2829
2830         return NOTIFY_DONE;
2831 }
2832
2833 static int bond_master_netdev_event(unsigned long event,
2834                                     struct net_device *bond_dev)
2835 {
2836         struct bonding *event_bond = netdev_priv(bond_dev);
2837
2838         switch (event) {
2839         case NETDEV_CHANGENAME:
2840                 return bond_event_changename(event_bond);
2841         case NETDEV_UNREGISTER:
2842                 bond_remove_proc_entry(event_bond);
2843                 break;
2844         case NETDEV_REGISTER:
2845                 bond_create_proc_entry(event_bond);
2846                 break;
2847         case NETDEV_NOTIFY_PEERS:
2848                 if (event_bond->send_peer_notif)
2849                         event_bond->send_peer_notif--;
2850                 break;
2851         default:
2852                 break;
2853         }
2854
2855         return NOTIFY_DONE;
2856 }
2857
2858 static int bond_slave_netdev_event(unsigned long event,
2859                                    struct net_device *slave_dev)
2860 {
2861         struct slave *slave = bond_slave_get_rtnl(slave_dev);
2862         struct bonding *bond;
2863         struct net_device *bond_dev;
2864         u32 old_speed;
2865         u8 old_duplex;
2866
2867         /* A netdev event can be generated while enslaving a device
2868          * before netdev_rx_handler_register is called in which case
2869          * slave will be NULL
2870          */
2871         if (!slave)
2872                 return NOTIFY_DONE;
2873         bond_dev = slave->bond->dev;
2874         bond = slave->bond;
2875
2876         switch (event) {
2877         case NETDEV_UNREGISTER:
2878                 if (bond_dev->type != ARPHRD_ETHER)
2879                         bond_release_and_destroy(bond_dev, slave_dev);
2880                 else
2881                         bond_release(bond_dev, slave_dev);
2882                 break;
2883         case NETDEV_UP:
2884         case NETDEV_CHANGE:
2885                 old_speed = slave->speed;
2886                 old_duplex = slave->duplex;
2887
2888                 bond_update_speed_duplex(slave);
2889
2890                 if (BOND_MODE(bond) == BOND_MODE_8023AD) {
2891                         if (old_speed != slave->speed)
2892                                 bond_3ad_adapter_speed_changed(slave);
2893                         if (old_duplex != slave->duplex)
2894                                 bond_3ad_adapter_duplex_changed(slave);
2895                 }
2896                 break;
2897         case NETDEV_DOWN:
2898                 /*
2899                  * ... Or is it this?
2900                  */
2901                 break;
2902         case NETDEV_CHANGEMTU:
2903                 /*
2904                  * TODO: Should slaves be allowed to
2905                  * independently alter their MTU?  For
2906                  * an active-backup bond, slaves need
2907                  * not be the same type of device, so
2908                  * MTUs may vary.  For other modes,
2909                  * slaves arguably should have the
2910                  * same MTUs. To do this, we'd need to
2911                  * take over the slave's change_mtu
2912                  * function for the duration of their
2913                  * servitude.
2914                  */
2915                 break;
2916         case NETDEV_CHANGENAME:
2917                 /* we don't care if we don't have primary set */
2918                 if (!bond_uses_primary(bond) ||
2919                     !bond->params.primary[0])
2920                         break;
2921
2922                 if (slave == bond->primary_slave) {
2923                         /* slave's name changed - he's no longer primary */
2924                         bond->primary_slave = NULL;
2925                 } else if (!strcmp(slave_dev->name, bond->params.primary)) {
2926                         /* we have a new primary slave */
2927                         bond->primary_slave = slave;
2928                 } else { /* we didn't change primary - exit */
2929                         break;
2930                 }
2931
2932                 netdev_info(bond->dev, "Primary slave changed to %s, reselecting active slave\n",
2933                             bond->primary_slave ? slave_dev->name : "none");
2934
2935                 block_netpoll_tx();
2936                 write_lock_bh(&bond->curr_slave_lock);
2937                 bond_select_active_slave(bond);
2938                 write_unlock_bh(&bond->curr_slave_lock);
2939                 unblock_netpoll_tx();
2940                 break;
2941         case NETDEV_FEAT_CHANGE:
2942                 bond_compute_features(bond);
2943                 break;
2944         case NETDEV_RESEND_IGMP:
2945                 /* Propagate to master device */
2946                 call_netdevice_notifiers(event, slave->bond->dev);
2947                 break;
2948         default:
2949                 break;
2950         }
2951
2952         return NOTIFY_DONE;
2953 }
2954
2955 /*
2956  * bond_netdev_event: handle netdev notifier chain events.
2957  *
2958  * This function receives events for the netdev chain.  The caller (an
2959  * ioctl handler calling blocking_notifier_call_chain) holds the necessary
2960  * locks for us to safely manipulate the slave devices (RTNL lock,
2961  * dev_probe_lock).
2962  */
2963 static int bond_netdev_event(struct notifier_block *this,
2964                              unsigned long event, void *ptr)
2965 {
2966         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2967
2968         netdev_dbg(event_dev, "event: %lx\n", event);
2969
2970         if (!(event_dev->priv_flags & IFF_BONDING))
2971                 return NOTIFY_DONE;
2972
2973         if (event_dev->flags & IFF_MASTER) {
2974                 netdev_dbg(event_dev, "IFF_MASTER\n");
2975                 return bond_master_netdev_event(event, event_dev);
2976         }
2977
2978         if (event_dev->flags & IFF_SLAVE) {
2979                 netdev_dbg(event_dev, "IFF_SLAVE\n");
2980                 return bond_slave_netdev_event(event, event_dev);
2981         }
2982
2983         return NOTIFY_DONE;
2984 }
2985
2986 static struct notifier_block bond_netdev_notifier = {
2987         .notifier_call = bond_netdev_event,
2988 };
2989
2990 /*---------------------------- Hashing Policies -----------------------------*/
2991
2992 /* L2 hash helper */
2993 static inline u32 bond_eth_hash(struct sk_buff *skb)
2994 {
2995         struct ethhdr *ep, hdr_tmp;
2996
2997         ep = skb_header_pointer(skb, 0, sizeof(hdr_tmp), &hdr_tmp);
2998         if (ep)
2999                 return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
3000         return 0;
3001 }
3002
3003 /* Extract the appropriate headers based on bond's xmit policy */
3004 static bool bond_flow_dissect(struct bonding *bond, struct sk_buff *skb,
3005                               struct flow_keys *fk)
3006 {
3007         const struct ipv6hdr *iph6;
3008         const struct iphdr *iph;
3009         int noff, proto = -1;
3010
3011         if (bond->params.xmit_policy > BOND_XMIT_POLICY_LAYER23)
3012                 return skb_flow_dissect(skb, fk);
3013
3014         fk->ports = 0;
3015         noff = skb_network_offset(skb);
3016         if (skb->protocol == htons(ETH_P_IP)) {
3017                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
3018                         return false;
3019                 iph = ip_hdr(skb);
3020                 fk->src = iph->saddr;
3021                 fk->dst = iph->daddr;
3022                 noff += iph->ihl << 2;
3023                 if (!ip_is_fragment(iph))
3024                         proto = iph->protocol;
3025         } else if (skb->protocol == htons(ETH_P_IPV6)) {
3026                 if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph6))))
3027                         return false;
3028                 iph6 = ipv6_hdr(skb);
3029                 fk->src = (__force __be32)ipv6_addr_hash(&iph6->saddr);
3030                 fk->dst = (__force __be32)ipv6_addr_hash(&iph6->daddr);
3031                 noff += sizeof(*iph6);
3032                 proto = iph6->nexthdr;
3033         } else {
3034                 return false;
3035         }
3036         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER34 && proto >= 0)
3037                 fk->ports = skb_flow_get_ports(skb, noff, proto);
3038
3039         return true;
3040 }
3041
3042 /**
3043  * bond_xmit_hash - generate a hash value based on the xmit policy
3044  * @bond: bonding device
3045  * @skb: buffer to use for headers
3046  *
3047  * This function will extract the necessary headers from the skb buffer and use
3048  * them to generate a hash based on the xmit_policy set in the bonding device
3049  */
3050 u32 bond_xmit_hash(struct bonding *bond, struct sk_buff *skb)
3051 {
3052         struct flow_keys flow;
3053         u32 hash;
3054
3055         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER2 ||
3056             !bond_flow_dissect(bond, skb, &flow))
3057                 return bond_eth_hash(skb);
3058
3059         if (bond->params.xmit_policy == BOND_XMIT_POLICY_LAYER23 ||
3060             bond->params.xmit_policy == BOND_XMIT_POLICY_ENCAP23)
3061                 hash = bond_eth_hash(skb);
3062         else
3063                 hash = (__force u32)flow.ports;
3064         hash ^= (__force u32)flow.dst ^ (__force u32)flow.src;
3065         hash ^= (hash >> 16);
3066         hash ^= (hash >> 8);
3067
3068         return hash;
3069 }
3070
3071 /*-------------------------- Device entry points ----------------------------*/
3072
3073 static void bond_work_init_all(struct bonding *bond)
3074 {
3075         INIT_DELAYED_WORK(&bond->mcast_work,
3076                           bond_resend_igmp_join_requests_delayed);
3077         INIT_DELAYED_WORK(&bond->alb_work, bond_alb_monitor);
3078         INIT_DELAYED_WORK(&bond->mii_work, bond_mii_monitor);
3079         if (BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3080                 INIT_DELAYED_WORK(&bond->arp_work, bond_activebackup_arp_mon);
3081         else
3082                 INIT_DELAYED_WORK(&bond->arp_work, bond_loadbalance_arp_mon);
3083         INIT_DELAYED_WORK(&bond->ad_work, bond_3ad_state_machine_handler);
3084 }
3085
3086 static void bond_work_cancel_all(struct bonding *bond)
3087 {
3088         cancel_delayed_work_sync(&bond->mii_work);
3089         cancel_delayed_work_sync(&bond->arp_work);
3090         cancel_delayed_work_sync(&bond->alb_work);
3091         cancel_delayed_work_sync(&bond->ad_work);
3092         cancel_delayed_work_sync(&bond->mcast_work);
3093 }
3094
3095 static int bond_open(struct net_device *bond_dev)
3096 {
3097         struct bonding *bond = netdev_priv(bond_dev);
3098         struct list_head *iter;
3099         struct slave *slave;
3100
3101         /* reset slave->backup and slave->inactive */
3102         read_lock(&bond->lock);
3103         if (bond_has_slaves(bond)) {
3104                 read_lock(&bond->curr_slave_lock);
3105                 bond_for_each_slave(bond, slave, iter) {
3106                         if (bond_uses_primary(bond) &&
3107                             slave != rcu_access_pointer(bond->curr_active_slave)) {
3108                                 bond_set_slave_inactive_flags(slave,
3109                                                               BOND_SLAVE_NOTIFY_NOW);
3110                         } else {
3111                                 bond_set_slave_active_flags(slave,
3112                                                             BOND_SLAVE_NOTIFY_NOW);
3113                         }
3114                 }
3115                 read_unlock(&bond->curr_slave_lock);
3116         }
3117         read_unlock(&bond->lock);
3118
3119         bond_work_init_all(bond);
3120
3121         if (bond_is_lb(bond)) {
3122                 /* bond_alb_initialize must be called before the timer
3123                  * is started.
3124                  */
3125                 if (bond_alb_initialize(bond, (BOND_MODE(bond) == BOND_MODE_ALB)))
3126                         return -ENOMEM;
3127                 if (bond->params.tlb_dynamic_lb)
3128                         queue_delayed_work(bond->wq, &bond->alb_work, 0);
3129         }
3130
3131         if (bond->params.miimon)  /* link check interval, in milliseconds. */
3132                 queue_delayed_work(bond->wq, &bond->mii_work, 0);
3133
3134         if (bond->params.arp_interval) {  /* arp interval, in milliseconds. */
3135                 queue_delayed_work(bond->wq, &bond->arp_work, 0);
3136                 bond->recv_probe = bond_arp_rcv;
3137         }
3138
3139         if (BOND_MODE(bond) == BOND_MODE_8023AD) {
3140                 queue_delayed_work(bond->wq, &bond->ad_work, 0);
3141                 /* register to receive LACPDUs */
3142                 bond->recv_probe = bond_3ad_lacpdu_recv;
3143                 bond_3ad_initiate_agg_selection(bond, 1);
3144         }
3145
3146         return 0;
3147 }
3148
3149 static int bond_close(struct net_device *bond_dev)
3150 {
3151         struct bonding *bond = netdev_priv(bond_dev);
3152
3153         bond_work_cancel_all(bond);
3154         bond->send_peer_notif = 0;
3155         if (bond_is_lb(bond))
3156                 bond_alb_deinitialize(bond);
3157         bond->recv_probe = NULL;
3158
3159         return 0;
3160 }
3161
3162 static struct rtnl_link_stats64 *bond_get_stats(struct net_device *bond_dev,
3163                                                 struct rtnl_link_stats64 *stats)
3164 {
3165         struct bonding *bond = netdev_priv(bond_dev);
3166         struct rtnl_link_stats64 temp;
3167         struct list_head *iter;
3168         struct slave *slave;
3169
3170         memset(stats, 0, sizeof(*stats));
3171
3172         read_lock_bh(&bond->lock);
3173         bond_for_each_slave(bond, slave, iter) {
3174                 const struct rtnl_link_stats64 *sstats =
3175                         dev_get_stats(slave->dev, &temp);
3176
3177                 stats->rx_packets += sstats->rx_packets;
3178                 stats->rx_bytes += sstats->rx_bytes;
3179                 stats->rx_errors += sstats->rx_errors;
3180                 stats->rx_dropped += sstats->rx_dropped;
3181
3182                 stats->tx_packets += sstats->tx_packets;
3183                 stats->tx_bytes += sstats->tx_bytes;
3184                 stats->tx_errors += sstats->tx_errors;
3185                 stats->tx_dropped += sstats->tx_dropped;
3186
3187                 stats->multicast += sstats->multicast;
3188                 stats->collisions += sstats->collisions;
3189
3190                 stats->rx_length_errors += sstats->rx_length_errors;
3191                 stats->rx_over_errors += sstats->rx_over_errors;
3192                 stats->rx_crc_errors += sstats->rx_crc_errors;
3193                 stats->rx_frame_errors += sstats->rx_frame_errors;
3194                 stats->rx_fifo_errors += sstats->rx_fifo_errors;
3195                 stats->rx_missed_errors += sstats->rx_missed_errors;
3196
3197                 stats->tx_aborted_errors += sstats->tx_aborted_errors;
3198                 stats->tx_carrier_errors += sstats->tx_carrier_errors;
3199                 stats->tx_fifo_errors += sstats->tx_fifo_errors;
3200                 stats->tx_heartbeat_errors += sstats->tx_heartbeat_errors;
3201                 stats->tx_window_errors += sstats->tx_window_errors;
3202         }
3203         read_unlock_bh(&bond->lock);
3204
3205         return stats;
3206 }
3207
3208 static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
3209 {
3210         struct bonding *bond = netdev_priv(bond_dev);
3211         struct net_device *slave_dev = NULL;
3212         struct ifbond k_binfo;
3213         struct ifbond __user *u_binfo = NULL;
3214         struct ifslave k_sinfo;
3215         struct ifslave __user *u_sinfo = NULL;
3216         struct mii_ioctl_data *mii = NULL;
3217         struct bond_opt_value newval;
3218         struct net *net;
3219         int res = 0;
3220
3221         netdev_dbg(bond_dev, "bond_ioctl: cmd=%d\n", cmd);
3222
3223         switch (cmd) {
3224         case SIOCGMIIPHY:
3225                 mii = if_mii(ifr);
3226                 if (!mii)
3227                         return -EINVAL;
3228
3229                 mii->phy_id = 0;
3230                 /* Fall Through */
3231         case SIOCGMIIREG:
3232                 /*
3233                  * We do this again just in case we were called by SIOCGMIIREG
3234                  * instead of SIOCGMIIPHY.
3235                  */
3236                 mii = if_mii(ifr);
3237                 if (!mii)
3238                         return -EINVAL;
3239
3240
3241                 if (mii->reg_num == 1) {
3242                         mii->val_out = 0;
3243                         read_lock(&bond->lock);
3244                         read_lock(&bond->curr_slave_lock);
3245                         if (netif_carrier_ok(bond->dev))
3246                                 mii->val_out = BMSR_LSTATUS;
3247
3248                         read_unlock(&bond->curr_slave_lock);
3249                         read_unlock(&bond->lock);
3250                 }
3251
3252                 return 0;
3253         case BOND_INFO_QUERY_OLD:
3254         case SIOCBONDINFOQUERY:
3255                 u_binfo = (struct ifbond __user *)ifr->ifr_data;
3256
3257                 if (copy_from_user(&k_binfo, u_binfo, sizeof(ifbond)))
3258                         return -EFAULT;
3259
3260                 res = bond_info_query(bond_dev, &k_binfo);
3261                 if (res == 0 &&
3262                     copy_to_user(u_binfo, &k_binfo, sizeof(ifbond)))
3263                         return -EFAULT;
3264
3265                 return res;
3266         case BOND_SLAVE_INFO_QUERY_OLD:
3267         case SIOCBONDSLAVEINFOQUERY:
3268                 u_sinfo = (struct ifslave __user *)ifr->ifr_data;
3269
3270                 if (copy_from_user(&k_sinfo, u_sinfo, sizeof(ifslave)))
3271                         return -EFAULT;
3272
3273                 res = bond_slave_info_query(bond_dev, &k_sinfo);
3274                 if (res == 0 &&
3275                     copy_to_user(u_sinfo, &k_sinfo, sizeof(ifslave)))
3276                         return -EFAULT;
3277
3278                 return res;
3279         default:
3280                 /* Go on */
3281                 break;
3282         }
3283
3284         net = dev_net(bond_dev);
3285
3286         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3287                 return -EPERM;
3288
3289         slave_dev = __dev_get_by_name(net, ifr->ifr_slave);
3290
3291         netdev_dbg(bond_dev, "slave_dev=%p:\n", slave_dev);
3292
3293         if (!slave_dev)
3294                 return -ENODEV;
3295
3296         netdev_dbg(bond_dev, "slave_dev->name=%s:\n", slave_dev->name);
3297         switch (cmd) {
3298         case BOND_ENSLAVE_OLD:
3299         case SIOCBONDENSLAVE:
3300                 res = bond_enslave(bond_dev, slave_dev);
3301                 break;
3302         case BOND_RELEASE_OLD:
3303         case SIOCBONDRELEASE:
3304                 res = bond_release(bond_dev, slave_dev);
3305                 break;
3306         case BOND_SETHWADDR_OLD:
3307         case SIOCBONDSETHWADDR:
3308                 bond_set_dev_addr(bond_dev, slave_dev);
3309                 res = 0;
3310                 break;
3311         case BOND_CHANGE_ACTIVE_OLD:
3312         case SIOCBONDCHANGEACTIVE:
3313                 bond_opt_initstr(&newval, slave_dev->name);
3314                 res = __bond_opt_set(bond, BOND_OPT_ACTIVE_SLAVE, &newval);
3315                 break;
3316         default:
3317                 res = -EOPNOTSUPP;
3318         }
3319
3320         return res;
3321 }
3322
3323 static void bond_change_rx_flags(struct net_device *bond_dev, int change)
3324 {
3325         struct bonding *bond = netdev_priv(bond_dev);
3326
3327         if (change & IFF_PROMISC)
3328                 bond_set_promiscuity(bond,
3329                                      bond_dev->flags & IFF_PROMISC ? 1 : -1);
3330
3331         if (change & IFF_ALLMULTI)
3332                 bond_set_allmulti(bond,
3333                                   bond_dev->flags & IFF_ALLMULTI ? 1 : -1);
3334 }
3335
3336 static void bond_set_rx_mode(struct net_device *bond_dev)
3337 {
3338         struct bonding *bond = netdev_priv(bond_dev);
3339         struct list_head *iter;
3340         struct slave *slave;
3341
3342
3343         rcu_read_lock();
3344         if (bond_uses_primary(bond)) {
3345                 slave = rcu_dereference(bond->curr_active_slave);
3346                 if (slave) {
3347                         dev_uc_sync(slave->dev, bond_dev);
3348                         dev_mc_sync(slave->dev, bond_dev);
3349                 }
3350         } else {
3351                 bond_for_each_slave_rcu(bond, slave, iter) {
3352                         dev_uc_sync_multiple(slave->dev, bond_dev);
3353                         dev_mc_sync_multiple(slave->dev, bond_dev);
3354                 }
3355         }
3356         rcu_read_unlock();
3357 }
3358
3359 static int bond_neigh_init(struct neighbour *n)
3360 {
3361         struct bonding *bond = netdev_priv(n->dev);
3362         const struct net_device_ops *slave_ops;
3363         struct neigh_parms parms;
3364         struct slave *slave;
3365         int ret;
3366
3367         slave = bond_first_slave(bond);
3368         if (!slave)
3369                 return 0;
3370         slave_ops = slave->dev->netdev_ops;
3371         if (!slave_ops->ndo_neigh_setup)
3372                 return 0;
3373
3374         parms.neigh_setup = NULL;
3375         parms.neigh_cleanup = NULL;
3376         ret = slave_ops->ndo_neigh_setup(slave->dev, &parms);
3377         if (ret)
3378                 return ret;
3379
3380         /*
3381          * Assign slave's neigh_cleanup to neighbour in case cleanup is called
3382          * after the last slave has been detached.  Assumes that all slaves
3383          * utilize the same neigh_cleanup (true at this writing as only user
3384          * is ipoib).
3385          */
3386         n->parms->neigh_cleanup = parms.neigh_cleanup;
3387
3388         if (!parms.neigh_setup)
3389                 return 0;
3390
3391         return parms.neigh_setup(n);
3392 }
3393
3394 /*
3395  * The bonding ndo_neigh_setup is called at init time beofre any
3396  * slave exists. So we must declare proxy setup function which will
3397  * be used at run time to resolve the actual slave neigh param setup.
3398  *
3399  * It's also called by master devices (such as vlans) to setup their
3400  * underlying devices. In that case - do nothing, we're already set up from
3401  * our init.
3402  */
3403 static int bond_neigh_setup(struct net_device *dev,
3404                             struct neigh_parms *parms)
3405 {
3406         /* modify only our neigh_parms */
3407         if (parms->dev == dev)
3408                 parms->neigh_setup = bond_neigh_init;
3409
3410         return 0;
3411 }
3412
3413 /*
3414  * Change the MTU of all of a master's slaves to match the master
3415  */
3416 static int bond_change_mtu(struct net_device *bond_dev, int new_mtu)
3417 {
3418         struct bonding *bond = netdev_priv(bond_dev);
3419         struct slave *slave, *rollback_slave;
3420         struct list_head *iter;
3421         int res = 0;
3422
3423         netdev_dbg(bond_dev, "bond=%p, new_mtu=%d\n", bond, new_mtu);
3424
3425         /* Can't hold bond->lock with bh disabled here since
3426          * some base drivers panic. On the other hand we can't
3427          * hold bond->lock without bh disabled because we'll
3428          * deadlock. The only solution is to rely on the fact
3429          * that we're under rtnl_lock here, and the slaves
3430          * list won't change. This doesn't solve the problem
3431          * of setting the slave's MTU while it is
3432          * transmitting, but the assumption is that the base
3433          * driver can handle that.
3434          *
3435          * TODO: figure out a way to safely iterate the slaves
3436          * list, but without holding a lock around the actual
3437          * call to the base driver.
3438          */
3439
3440         bond_for_each_slave(bond, slave, iter) {
3441                 netdev_dbg(bond_dev, "s %p c_m %p\n",
3442                            slave, slave->dev->netdev_ops->ndo_change_mtu);
3443
3444                 res = dev_set_mtu(slave->dev, new_mtu);
3445
3446                 if (res) {
3447                         /* If we failed to set the slave's mtu to the new value
3448                          * we must abort the operation even in ACTIVE_BACKUP
3449                          * mode, because if we allow the backup slaves to have
3450                          * different mtu values than the active slave we'll
3451                          * need to change their mtu when doing a failover. That
3452                          * means changing their mtu from timer context, which
3453                          * is probably not a good idea.
3454                          */
3455                         netdev_dbg(bond_dev, "err %d %s\n", res,
3456                                    slave->dev->name);
3457                         goto unwind;
3458                 }
3459         }
3460
3461         bond_dev->mtu = new_mtu;
3462
3463         return 0;
3464
3465 unwind:
3466         /* unwind from head to the slave that failed */
3467         bond_for_each_slave(bond, rollback_slave, iter) {
3468                 int tmp_res;
3469
3470                 if (rollback_slave == slave)
3471                         break;
3472
3473                 tmp_res = dev_set_mtu(rollback_slave->dev, bond_dev->mtu);
3474                 if (tmp_res) {
3475                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3476                                    tmp_res, rollback_slave->dev->name);
3477                 }
3478         }
3479
3480         return res;
3481 }
3482
3483 /*
3484  * Change HW address
3485  *
3486  * Note that many devices must be down to change the HW address, and
3487  * downing the master releases all slaves.  We can make bonds full of
3488  * bonding devices to test this, however.
3489  */
3490 static int bond_set_mac_address(struct net_device *bond_dev, void *addr)
3491 {
3492         struct bonding *bond = netdev_priv(bond_dev);
3493         struct slave *slave, *rollback_slave;
3494         struct sockaddr *sa = addr, tmp_sa;
3495         struct list_head *iter;
3496         int res = 0;
3497
3498         if (BOND_MODE(bond) == BOND_MODE_ALB)
3499                 return bond_alb_set_mac_address(bond_dev, addr);
3500
3501
3502         netdev_dbg(bond_dev, "bond=%p\n", bond);
3503
3504         /* If fail_over_mac is enabled, do nothing and return success.
3505          * Returning an error causes ifenslave to fail.
3506          */
3507         if (bond->params.fail_over_mac &&
3508             BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP)
3509                 return 0;
3510
3511         if (!is_valid_ether_addr(sa->sa_data))
3512                 return -EADDRNOTAVAIL;
3513
3514         /* Can't hold bond->lock with bh disabled here since
3515          * some base drivers panic. On the other hand we can't
3516          * hold bond->lock without bh disabled because we'll
3517          * deadlock. The only solution is to rely on the fact
3518          * that we're under rtnl_lock here, and the slaves
3519          * list won't change. This doesn't solve the problem
3520          * of setting the slave's hw address while it is
3521          * transmitting, but the assumption is that the base
3522          * driver can handle that.
3523          *
3524          * TODO: figure out a way to safely iterate the slaves
3525          * list, but without holding a lock around the actual
3526          * call to the base driver.
3527          */
3528
3529         bond_for_each_slave(bond, slave, iter) {
3530                 netdev_dbg(bond_dev, "slave %p %s\n", slave, slave->dev->name);
3531                 res = dev_set_mac_address(slave->dev, addr);
3532                 if (res) {
3533                         /* TODO: consider downing the slave
3534                          * and retry ?
3535                          * User should expect communications
3536                          * breakage anyway until ARP finish
3537                          * updating, so...
3538                          */
3539                         netdev_dbg(bond_dev, "err %d %s\n", res, slave->dev->name);
3540                         goto unwind;
3541                 }
3542         }
3543
3544         /* success */
3545         memcpy(bond_dev->dev_addr, sa->sa_data, bond_dev->addr_len);
3546         return 0;
3547
3548 unwind:
3549         memcpy(tmp_sa.sa_data, bond_dev->dev_addr, bond_dev->addr_len);
3550         tmp_sa.sa_family = bond_dev->type;
3551
3552         /* unwind from head to the slave that failed */
3553         bond_for_each_slave(bond, rollback_slave, iter) {
3554                 int tmp_res;
3555
3556                 if (rollback_slave == slave)
3557                         break;
3558
3559                 tmp_res = dev_set_mac_address(rollback_slave->dev, &tmp_sa);
3560                 if (tmp_res) {
3561                         netdev_dbg(bond_dev, "unwind err %d dev %s\n",
3562                                    tmp_res, rollback_slave->dev->name);
3563                 }
3564         }
3565
3566         return res;
3567 }
3568
3569 /**
3570  * bond_xmit_slave_id - transmit skb through slave with slave_id
3571  * @bond: bonding device that is transmitting
3572  * @skb: buffer to transmit
3573  * @slave_id: slave id up to slave_cnt-1 through which to transmit
3574  *
3575  * This function tries to transmit through slave with slave_id but in case
3576  * it fails, it tries to find the first available slave for transmission.
3577  * The skb is consumed in all cases, thus the function is void.
3578  */
3579 static void bond_xmit_slave_id(struct bonding *bond, struct sk_buff *skb, int slave_id)
3580 {
3581         struct list_head *iter;
3582         struct slave *slave;
3583         int i = slave_id;
3584
3585         /* Here we start from the slave with slave_id */
3586         bond_for_each_slave_rcu(bond, slave, iter) {
3587                 if (--i < 0) {
3588                         if (bond_slave_can_tx(slave)) {
3589                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3590                                 return;
3591                         }
3592                 }
3593         }
3594
3595         /* Here we start from the first slave up to slave_id */
3596         i = slave_id;
3597         bond_for_each_slave_rcu(bond, slave, iter) {
3598                 if (--i < 0)
3599                         break;
3600                 if (bond_slave_can_tx(slave)) {
3601                         bond_dev_queue_xmit(bond, skb, slave->dev);
3602                         return;
3603                 }
3604         }
3605         /* no slave that can tx has been found */
3606         dev_kfree_skb_any(skb);
3607 }
3608
3609 /**
3610  * bond_rr_gen_slave_id - generate slave id based on packets_per_slave
3611  * @bond: bonding device to use
3612  *
3613  * Based on the value of the bonding device's packets_per_slave parameter
3614  * this function generates a slave id, which is usually used as the next
3615  * slave to transmit through.
3616  */
3617 static u32 bond_rr_gen_slave_id(struct bonding *bond)
3618 {
3619         u32 slave_id;
3620         struct reciprocal_value reciprocal_packets_per_slave;
3621         int packets_per_slave = bond->params.packets_per_slave;
3622
3623         switch (packets_per_slave) {
3624         case 0:
3625                 slave_id = prandom_u32();
3626                 break;
3627         case 1:
3628                 slave_id = bond->rr_tx_counter;
3629                 break;
3630         default:
3631                 reciprocal_packets_per_slave =
3632                         bond->params.reciprocal_packets_per_slave;
3633                 slave_id = reciprocal_divide(bond->rr_tx_counter,
3634                                              reciprocal_packets_per_slave);
3635                 break;
3636         }
3637         bond->rr_tx_counter++;
3638
3639         return slave_id;
3640 }
3641
3642 static int bond_xmit_roundrobin(struct sk_buff *skb, struct net_device *bond_dev)
3643 {
3644         struct bonding *bond = netdev_priv(bond_dev);
3645         struct iphdr *iph = ip_hdr(skb);
3646         struct slave *slave;
3647         u32 slave_id;
3648
3649         /* Start with the curr_active_slave that joined the bond as the
3650          * default for sending IGMP traffic.  For failover purposes one
3651          * needs to maintain some consistency for the interface that will
3652          * send the join/membership reports.  The curr_active_slave found
3653          * will send all of this type of traffic.
3654          */
3655         if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
3656                 slave = rcu_dereference(bond->curr_active_slave);
3657                 if (slave && bond_slave_can_tx(slave))
3658                         bond_dev_queue_xmit(bond, skb, slave->dev);
3659                 else
3660                         bond_xmit_slave_id(bond, skb, 0);
3661         } else {
3662                 slave_id = bond_rr_gen_slave_id(bond);
3663                 bond_xmit_slave_id(bond, skb, slave_id % bond->slave_cnt);
3664         }
3665
3666         return NETDEV_TX_OK;
3667 }
3668
3669 /*
3670  * in active-backup mode, we know that bond->curr_active_slave is always valid if
3671  * the bond has a usable interface.
3672  */
3673 static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_dev)
3674 {
3675         struct bonding *bond = netdev_priv(bond_dev);
3676         struct slave *slave;
3677
3678         slave = rcu_dereference(bond->curr_active_slave);
3679         if (slave)
3680                 bond_dev_queue_xmit(bond, skb, slave->dev);
3681         else
3682                 dev_kfree_skb_any(skb);
3683
3684         return NETDEV_TX_OK;
3685 }
3686
3687 /* In bond_xmit_xor() , we determine the output device by using a pre-
3688  * determined xmit_hash_policy(), If the selected device is not enabled,
3689  * find the next active slave.
3690  */
3691 static int bond_xmit_xor(struct sk_buff *skb, struct net_device *bond_dev)
3692 {
3693         struct bonding *bond = netdev_priv(bond_dev);
3694
3695         bond_xmit_slave_id(bond, skb, bond_xmit_hash(bond, skb) % bond->slave_cnt);
3696
3697         return NETDEV_TX_OK;
3698 }
3699
3700 /* in broadcast mode, we send everything to all usable interfaces. */
3701 static int bond_xmit_broadcast(struct sk_buff *skb, struct net_device *bond_dev)
3702 {
3703         struct bonding *bond = netdev_priv(bond_dev);
3704         struct slave *slave = NULL;
3705         struct list_head *iter;
3706
3707         bond_for_each_slave_rcu(bond, slave, iter) {
3708                 if (bond_is_last_slave(bond, slave))
3709                         break;
3710                 if (bond_slave_is_up(slave) && slave->link == BOND_LINK_UP) {
3711                         struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
3712
3713                         if (!skb2) {
3714                                 net_err_ratelimited("%s: Error: %s: skb_clone() failed\n",
3715                                                     bond_dev->name, __func__);
3716                                 continue;
3717                         }
3718                         /* bond_dev_queue_xmit always returns 0 */
3719                         bond_dev_queue_xmit(bond, skb2, slave->dev);
3720                 }
3721         }
3722         if (slave && bond_slave_is_up(slave) && slave->link == BOND_LINK_UP)
3723                 bond_dev_queue_xmit(bond, skb, slave->dev);
3724         else
3725                 dev_kfree_skb_any(skb);
3726
3727         return NETDEV_TX_OK;
3728 }
3729
3730 /*------------------------- Device initialization ---------------------------*/
3731
3732 /*
3733  * Lookup the slave that corresponds to a qid
3734  */
3735 static inline int bond_slave_override(struct bonding *bond,
3736                                       struct sk_buff *skb)
3737 {
3738         struct slave *slave = NULL;
3739         struct list_head *iter;
3740
3741         if (!skb->queue_mapping)
3742                 return 1;
3743
3744         /* Find out if any slaves have the same mapping as this skb. */
3745         bond_for_each_slave_rcu(bond, slave, iter) {
3746                 if (slave->queue_id == skb->queue_mapping) {
3747                         if (bond_slave_can_tx(slave)) {
3748                                 bond_dev_queue_xmit(bond, skb, slave->dev);
3749                                 return 0;
3750                         }
3751                         /* If the slave isn't UP, use default transmit policy. */
3752                         break;
3753                 }
3754         }
3755
3756         return 1;
3757 }
3758
3759
3760 static u16 bond_select_queue(struct net_device *dev, struct sk_buff *skb,
3761                              void *accel_priv, select_queue_fallback_t fallback)
3762 {
3763         /*
3764          * This helper function exists to help dev_pick_tx get the correct
3765          * destination queue.  Using a helper function skips a call to
3766          * skb_tx_hash and will put the skbs in the queue we expect on their
3767          * way down to the bonding driver.
3768          */
3769         u16 txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : 0;
3770
3771         /*
3772          * Save the original txq to restore before passing to the driver
3773          */
3774         qdisc_skb_cb(skb)->slave_dev_queue_mapping = skb->queue_mapping;
3775
3776         if (unlikely(txq >= dev->real_num_tx_queues)) {
3777                 do {
3778                         txq -= dev->real_num_tx_queues;
3779                 } while (txq >= dev->real_num_tx_queues);
3780         }
3781         return txq;
3782 }
3783
3784 static netdev_tx_t __bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3785 {
3786         struct bonding *bond = netdev_priv(dev);
3787
3788         if (bond_should_override_tx_queue(bond) &&
3789             !bond_slave_override(bond, skb))
3790                 return NETDEV_TX_OK;
3791
3792         switch (BOND_MODE(bond)) {
3793         case BOND_MODE_ROUNDROBIN:
3794                 return bond_xmit_roundrobin(skb, dev);
3795         case BOND_MODE_ACTIVEBACKUP:
3796                 return bond_xmit_activebackup(skb, dev);
3797         case BOND_MODE_XOR:
3798                 return bond_xmit_xor(skb, dev);
3799         case BOND_MODE_BROADCAST:
3800                 return bond_xmit_broadcast(skb, dev);
3801         case BOND_MODE_8023AD:
3802                 return bond_3ad_xmit_xor(skb, dev);
3803         case BOND_MODE_ALB:
3804                 return bond_alb_xmit(skb, dev);
3805         case BOND_MODE_TLB:
3806                 return bond_tlb_xmit(skb, dev);
3807         default:
3808                 /* Should never happen, mode already checked */
3809                 netdev_err(dev, "Unknown bonding mode %d\n", BOND_MODE(bond));
3810                 WARN_ON_ONCE(1);
3811                 dev_kfree_skb_any(skb);
3812                 return NETDEV_TX_OK;
3813         }
3814 }
3815
3816 static netdev_tx_t bond_start_xmit(struct sk_buff *skb, struct net_device *dev)
3817 {
3818         struct bonding *bond = netdev_priv(dev);
3819         netdev_tx_t ret = NETDEV_TX_OK;
3820
3821         /*
3822          * If we risk deadlock from transmitting this in the
3823          * netpoll path, tell netpoll to queue the frame for later tx
3824          */
3825         if (unlikely(is_netpoll_tx_blocked(dev)))
3826                 return NETDEV_TX_BUSY;
3827
3828         rcu_read_lock();
3829         if (bond_has_slaves(bond))
3830                 ret = __bond_start_xmit(skb, dev);
3831         else
3832                 dev_kfree_skb_any(skb);
3833         rcu_read_unlock();
3834
3835         return ret;
3836 }
3837
3838 static int bond_ethtool_get_settings(struct net_device *bond_dev,
3839                                      struct ethtool_cmd *ecmd)
3840 {
3841         struct bonding *bond = netdev_priv(bond_dev);
3842         unsigned long speed = 0;
3843         struct list_head *iter;
3844         struct slave *slave;
3845
3846         ecmd->duplex = DUPLEX_UNKNOWN;
3847         ecmd->port = PORT_OTHER;
3848
3849         /* Since bond_slave_can_tx returns false for all inactive or down slaves, we
3850          * do not need to check mode.  Though link speed might not represent
3851          * the true receive or transmit bandwidth (not all modes are symmetric)
3852          * this is an accurate maximum.
3853          */
3854         read_lock(&bond->lock);
3855         bond_for_each_slave(bond, slave, iter) {
3856                 if (bond_slave_can_tx(slave)) {
3857                         if (slave->speed != SPEED_UNKNOWN)
3858                                 speed += slave->speed;
3859                         if (ecmd->duplex == DUPLEX_UNKNOWN &&
3860                             slave->duplex != DUPLEX_UNKNOWN)
3861                                 ecmd->duplex = slave->duplex;
3862                 }
3863         }
3864         ethtool_cmd_speed_set(ecmd, speed ? : SPEED_UNKNOWN);
3865         read_unlock(&bond->lock);
3866
3867         return 0;
3868 }
3869
3870 static void bond_ethtool_get_drvinfo(struct net_device *bond_dev,
3871                                      struct ethtool_drvinfo *drvinfo)
3872 {
3873         strlcpy(drvinfo->driver, DRV_NAME, sizeof(drvinfo->driver));
3874         strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
3875         snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version), "%d",
3876                  BOND_ABI_VERSION);
3877 }
3878
3879 static const struct ethtool_ops bond_ethtool_ops = {
3880         .get_drvinfo            = bond_ethtool_get_drvinfo,
3881         .get_settings           = bond_ethtool_get_settings,
3882         .get_link               = ethtool_op_get_link,
3883 };
3884
3885 static const struct net_device_ops bond_netdev_ops = {
3886         .ndo_init               = bond_init,
3887         .ndo_uninit             = bond_uninit,
3888         .ndo_open               = bond_open,
3889         .ndo_stop               = bond_close,
3890         .ndo_start_xmit         = bond_start_xmit,
3891         .ndo_select_queue       = bond_select_queue,
3892         .ndo_get_stats64        = bond_get_stats,
3893         .ndo_do_ioctl           = bond_do_ioctl,
3894         .ndo_change_rx_flags    = bond_change_rx_flags,
3895         .ndo_set_rx_mode        = bond_set_rx_mode,
3896         .ndo_change_mtu         = bond_change_mtu,
3897         .ndo_set_mac_address    = bond_set_mac_address,
3898         .ndo_neigh_setup        = bond_neigh_setup,
3899         .ndo_vlan_rx_add_vid    = bond_vlan_rx_add_vid,
3900         .ndo_vlan_rx_kill_vid   = bond_vlan_rx_kill_vid,
3901 #ifdef CONFIG_NET_POLL_CONTROLLER
3902         .ndo_netpoll_setup      = bond_netpoll_setup,
3903         .ndo_netpoll_cleanup    = bond_netpoll_cleanup,
3904         .ndo_poll_controller    = bond_poll_controller,
3905 #endif
3906         .ndo_add_slave          = bond_enslave,
3907         .ndo_del_slave          = bond_release,
3908         .ndo_fix_features       = bond_fix_features,
3909 };
3910
3911 static const struct device_type bond_type = {
3912         .name = "bond",
3913 };
3914
3915 static void bond_destructor(struct net_device *bond_dev)
3916 {
3917         struct bonding *bond = netdev_priv(bond_dev);
3918         if (bond->wq)
3919                 destroy_workqueue(bond->wq);
3920         free_netdev(bond_dev);
3921 }
3922
3923 void bond_setup(struct net_device *bond_dev)
3924 {
3925         struct bonding *bond = netdev_priv(bond_dev);
3926
3927         /* initialize rwlocks */
3928         rwlock_init(&bond->lock);
3929         rwlock_init(&bond->curr_slave_lock);
3930         bond->params = bonding_defaults;
3931
3932         /* Initialize pointers */
3933         bond->dev = bond_dev;
3934
3935         /* Initialize the device entry points */
3936         ether_setup(bond_dev);
3937         bond_dev->netdev_ops = &bond_netdev_ops;
3938         bond_dev->ethtool_ops = &bond_ethtool_ops;
3939
3940         bond_dev->destructor = bond_destructor;
3941
3942         SET_NETDEV_DEVTYPE(bond_dev, &bond_type);
3943
3944         /* Initialize the device options */
3945         bond_dev->tx_queue_len = 0;
3946         bond_dev->flags |= IFF_MASTER|IFF_MULTICAST;
3947         bond_dev->priv_flags |= IFF_BONDING | IFF_UNICAST_FLT;
3948         bond_dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
3949
3950         /* don't acquire bond device's netif_tx_lock when
3951          * transmitting */
3952         bond_dev->features |= NETIF_F_LLTX;
3953
3954         /* By default, we declare the bond to be fully
3955          * VLAN hardware accelerated capable. Special
3956          * care is taken in the various xmit functions
3957          * when there are slaves that are not hw accel
3958          * capable
3959          */
3960
3961         /* Don't allow bond devices to change network namespaces. */
3962         bond_dev->features |= NETIF_F_NETNS_LOCAL;
3963
3964         bond_dev->hw_features = BOND_VLAN_FEATURES |
3965                                 NETIF_F_HW_VLAN_CTAG_TX |
3966                                 NETIF_F_HW_VLAN_CTAG_RX |
3967                                 NETIF_F_HW_VLAN_CTAG_FILTER;
3968
3969         bond_dev->hw_features &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_HW_CSUM);
3970         bond_dev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
3971         bond_dev->features |= bond_dev->hw_features;
3972 }
3973
3974 /*
3975 * Destroy a bonding device.
3976 * Must be under rtnl_lock when this function is called.
3977 */
3978 static void bond_uninit(struct net_device *bond_dev)
3979 {
3980         struct bonding *bond = netdev_priv(bond_dev);
3981         struct list_head *iter;
3982         struct slave *slave;
3983
3984         bond_netpoll_cleanup(bond_dev);
3985
3986         /* Release the bonded slaves */
3987         bond_for_each_slave(bond, slave, iter)
3988                 __bond_release_one(bond_dev, slave->dev, true);
3989         netdev_info(bond_dev, "Released all slaves\n");
3990
3991         list_del(&bond->bond_list);
3992
3993         bond_debug_unregister(bond);
3994 }
3995
3996 /*------------------------- Module initialization ---------------------------*/
3997
3998 static int bond_check_params(struct bond_params *params)
3999 {
4000         int arp_validate_value, fail_over_mac_value, primary_reselect_value, i;
4001         struct bond_opt_value newval;
4002         const struct bond_opt_value *valptr;
4003         int arp_all_targets_value;
4004
4005         /*
4006          * Convert string parameters.
4007          */
4008         if (mode) {
4009                 bond_opt_initstr(&newval, mode);
4010                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_MODE), &newval);
4011                 if (!valptr) {
4012                         pr_err("Error: Invalid bonding mode \"%s\"\n", mode);
4013                         return -EINVAL;
4014                 }
4015                 bond_mode = valptr->value;
4016         }
4017
4018         if (xmit_hash_policy) {
4019                 if ((bond_mode != BOND_MODE_XOR) &&
4020                     (bond_mode != BOND_MODE_8023AD) &&
4021                     (bond_mode != BOND_MODE_TLB)) {
4022                         pr_info("xmit_hash_policy param is irrelevant in mode %s\n",
4023                                 bond_mode_name(bond_mode));
4024                 } else {
4025                         bond_opt_initstr(&newval, xmit_hash_policy);
4026                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_XMIT_HASH),
4027                                                 &newval);
4028                         if (!valptr) {
4029                                 pr_err("Error: Invalid xmit_hash_policy \"%s\"\n",
4030                                        xmit_hash_policy);
4031                                 return -EINVAL;
4032                         }
4033                         xmit_hashtype = valptr->value;
4034                 }
4035         }
4036
4037         if (lacp_rate) {
4038                 if (bond_mode != BOND_MODE_8023AD) {
4039                         pr_info("lacp_rate param is irrelevant in mode %s\n",
4040                                 bond_mode_name(bond_mode));
4041                 } else {
4042                         bond_opt_initstr(&newval, lacp_rate);
4043                         valptr = bond_opt_parse(bond_opt_get(BOND_OPT_LACP_RATE),
4044                                                 &newval);
4045                         if (!valptr) {
4046                                 pr_err("Error: Invalid lacp rate \"%s\"\n",
4047                                        lacp_rate);
4048                                 return -EINVAL;
4049                         }
4050                         lacp_fast = valptr->value;
4051                 }
4052         }
4053
4054         if (ad_select) {
4055                 bond_opt_initstr(&newval, ad_select);
4056                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_AD_SELECT),
4057                                         &newval);
4058                 if (!valptr) {
4059                         pr_err("Error: Invalid ad_select \"%s\"\n", ad_select);
4060                         return -EINVAL;
4061                 }
4062                 params->ad_select = valptr->value;
4063                 if (bond_mode != BOND_MODE_8023AD)
4064                         pr_warn("ad_select param only affects 802.3ad mode\n");
4065         } else {
4066                 params->ad_select = BOND_AD_STABLE;
4067         }
4068
4069         if (max_bonds < 0) {
4070                 pr_warn("Warning: max_bonds (%d) not in range %d-%d, so it was reset to BOND_DEFAULT_MAX_BONDS (%d)\n",
4071                         max_bonds, 0, INT_MAX, BOND_DEFAULT_MAX_BONDS);
4072                 max_bonds = BOND_DEFAULT_MAX_BONDS;
4073         }
4074
4075         if (miimon < 0) {
4076                 pr_warn("Warning: miimon module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4077                         miimon, INT_MAX);
4078                 miimon = 0;
4079         }
4080
4081         if (updelay < 0) {
4082                 pr_warn("Warning: updelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4083                         updelay, INT_MAX);
4084                 updelay = 0;
4085         }
4086
4087         if (downdelay < 0) {
4088                 pr_warn("Warning: downdelay module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4089                         downdelay, INT_MAX);
4090                 downdelay = 0;
4091         }
4092
4093         if ((use_carrier != 0) && (use_carrier != 1)) {
4094                 pr_warn("Warning: use_carrier module parameter (%d), not of valid value (0/1), so it was set to 1\n",
4095                         use_carrier);
4096                 use_carrier = 1;
4097         }
4098
4099         if (num_peer_notif < 0 || num_peer_notif > 255) {
4100                 pr_warn("Warning: num_grat_arp/num_unsol_na (%d) not in range 0-255 so it was reset to 1\n",
4101                         num_peer_notif);
4102                 num_peer_notif = 1;
4103         }
4104
4105         /* reset values for 802.3ad/TLB/ALB */
4106         if (!bond_mode_uses_arp(bond_mode)) {
4107                 if (!miimon) {
4108                         pr_warn("Warning: miimon must be specified, otherwise bonding will not detect link failure, speed and duplex which are essential for 802.3ad operation\n");
4109                         pr_warn("Forcing miimon to 100msec\n");
4110                         miimon = BOND_DEFAULT_MIIMON;
4111                 }
4112         }
4113
4114         if (tx_queues < 1 || tx_queues > 255) {
4115                 pr_warn("Warning: tx_queues (%d) should be between 1 and 255, resetting to %d\n",
4116                         tx_queues, BOND_DEFAULT_TX_QUEUES);
4117                 tx_queues = BOND_DEFAULT_TX_QUEUES;
4118         }
4119
4120         if ((all_slaves_active != 0) && (all_slaves_active != 1)) {
4121                 pr_warn("Warning: all_slaves_active module parameter (%d), not of valid value (0/1), so it was set to 0\n",
4122                         all_slaves_active);
4123                 all_slaves_active = 0;
4124         }
4125
4126         if (resend_igmp < 0 || resend_igmp > 255) {
4127                 pr_warn("Warning: resend_igmp (%d) should be between 0 and 255, resetting to %d\n",
4128                         resend_igmp, BOND_DEFAULT_RESEND_IGMP);
4129                 resend_igmp = BOND_DEFAULT_RESEND_IGMP;
4130         }
4131
4132         bond_opt_initval(&newval, packets_per_slave);
4133         if (!bond_opt_parse(bond_opt_get(BOND_OPT_PACKETS_PER_SLAVE), &newval)) {
4134                 pr_warn("Warning: packets_per_slave (%d) should be between 0 and %u resetting to 1\n",
4135                         packets_per_slave, USHRT_MAX);
4136                 packets_per_slave = 1;
4137         }
4138
4139         if (bond_mode == BOND_MODE_ALB) {
4140                 pr_notice("In ALB mode you might experience client disconnections upon reconnection of a link if the bonding module updelay parameter (%d msec) is incompatible with the forwarding delay time of the switch\n",
4141                           updelay);
4142         }
4143
4144         if (!miimon) {
4145                 if (updelay || downdelay) {
4146                         /* just warn the user the up/down delay will have
4147                          * no effect since miimon is zero...
4148                          */
4149                         pr_warn("Warning: miimon module parameter not set and updelay (%d) or downdelay (%d) module parameter is set; updelay and downdelay have no effect unless miimon is set\n",
4150                                 updelay, downdelay);
4151                 }
4152         } else {
4153                 /* don't allow arp monitoring */
4154                 if (arp_interval) {
4155                         pr_warn("Warning: miimon (%d) and arp_interval (%d) can't be used simultaneously, disabling ARP monitoring\n",
4156                                 miimon, arp_interval);
4157                         arp_interval = 0;
4158                 }
4159
4160                 if ((updelay % miimon) != 0) {
4161                         pr_warn("Warning: updelay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
4162                                 updelay, miimon, (updelay / miimon) * miimon);
4163                 }
4164
4165                 updelay /= miimon;
4166
4167                 if ((downdelay % miimon) != 0) {
4168                         pr_warn("Warning: downdelay (%d) is not a multiple of miimon (%d), downdelay rounded to %d ms\n",
4169                                 downdelay, miimon,
4170                                 (downdelay / miimon) * miimon);
4171                 }
4172
4173                 downdelay /= miimon;
4174         }
4175
4176         if (arp_interval < 0) {
4177                 pr_warn("Warning: arp_interval module parameter (%d), not in range 0-%d, so it was reset to 0\n",
4178                         arp_interval, INT_MAX);
4179                 arp_interval = 0;
4180         }
4181
4182         for (arp_ip_count = 0, i = 0;
4183              (arp_ip_count < BOND_MAX_ARP_TARGETS) && arp_ip_target[i]; i++) {
4184                 /* not complete check, but should be good enough to
4185                    catch mistakes */
4186                 __be32 ip;
4187                 if (!in4_pton(arp_ip_target[i], -1, (u8 *)&ip, -1, NULL) ||
4188                     !bond_is_ip_target_ok(ip)) {
4189                         pr_warn("Warning: bad arp_ip_target module parameter (%s), ARP monitoring will not be performed\n",
4190                                 arp_ip_target[i]);
4191                         arp_interval = 0;
4192                 } else {
4193                         if (bond_get_targets_ip(arp_target, ip) == -1)
4194                                 arp_target[arp_ip_count++] = ip;
4195                         else
4196                                 pr_warn("Warning: duplicate address %pI4 in arp_ip_target, skipping\n",
4197                                         &ip);
4198                 }
4199         }
4200
4201         if (arp_interval && !arp_ip_count) {
4202                 /* don't allow arping if no arp_ip_target given... */
4203                 pr_warn("Warning: arp_interval module parameter (%d) specified without providing an arp_ip_target parameter, arp_interval was reset to 0\n",
4204                         arp_interval);
4205                 arp_interval = 0;
4206         }
4207
4208         if (arp_validate) {
4209                 if (!arp_interval) {
4210                         pr_err("arp_validate requires arp_interval\n");
4211                         return -EINVAL;
4212                 }
4213
4214                 bond_opt_initstr(&newval, arp_validate);
4215                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_VALIDATE),
4216                                         &newval);
4217                 if (!valptr) {
4218                         pr_err("Error: invalid arp_validate \"%s\"\n",
4219                                arp_validate);
4220                         return -EINVAL;
4221                 }
4222                 arp_validate_value = valptr->value;
4223         } else {
4224                 arp_validate_value = 0;
4225         }
4226
4227         arp_all_targets_value = 0;
4228         if (arp_all_targets) {
4229                 bond_opt_initstr(&newval, arp_all_targets);
4230                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_ARP_ALL_TARGETS),
4231                                         &newval);
4232                 if (!valptr) {
4233                         pr_err("Error: invalid arp_all_targets_value \"%s\"\n",
4234                                arp_all_targets);
4235                         arp_all_targets_value = 0;
4236                 } else {
4237                         arp_all_targets_value = valptr->value;
4238                 }
4239         }
4240
4241         if (miimon) {
4242                 pr_info("MII link monitoring set to %d ms\n", miimon);
4243         } else if (arp_interval) {
4244                 valptr = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
4245                                           arp_validate_value);
4246                 pr_info("ARP monitoring set to %d ms, validate %s, with %d target(s):",
4247                         arp_interval, valptr->string, arp_ip_count);
4248
4249                 for (i = 0; i < arp_ip_count; i++)
4250                         pr_cont(" %s", arp_ip_target[i]);
4251
4252                 pr_cont("\n");
4253
4254         } else if (max_bonds) {
4255                 /* miimon and arp_interval not set, we need one so things
4256                  * work as expected, see bonding.txt for details
4257                  */
4258                 pr_debug("Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details\n");
4259         }
4260
4261         if (primary && !bond_mode_uses_primary(bond_mode)) {
4262                 /* currently, using a primary only makes sense
4263                  * in active backup, TLB or ALB modes
4264                  */
4265                 pr_warn("Warning: %s primary device specified but has no effect in %s mode\n",
4266                         primary, bond_mode_name(bond_mode));
4267                 primary = NULL;
4268         }
4269
4270         if (primary && primary_reselect) {
4271                 bond_opt_initstr(&newval, primary_reselect);
4272                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_PRIMARY_RESELECT),
4273                                         &newval);
4274                 if (!valptr) {
4275                         pr_err("Error: Invalid primary_reselect \"%s\"\n",
4276                                primary_reselect);
4277                         return -EINVAL;
4278                 }
4279                 primary_reselect_value = valptr->value;
4280         } else {
4281                 primary_reselect_value = BOND_PRI_RESELECT_ALWAYS;
4282         }
4283
4284         if (fail_over_mac) {
4285                 bond_opt_initstr(&newval, fail_over_mac);
4286                 valptr = bond_opt_parse(bond_opt_get(BOND_OPT_FAIL_OVER_MAC),
4287                                         &newval);
4288                 if (!valptr) {
4289                         pr_err("Error: invalid fail_over_mac \"%s\"\n",
4290                                fail_over_mac);
4291                         return -EINVAL;
4292                 }
4293                 fail_over_mac_value = valptr->value;
4294                 if (bond_mode != BOND_MODE_ACTIVEBACKUP)
4295                         pr_warn("Warning: fail_over_mac only affects active-backup mode\n");
4296         } else {
4297                 fail_over_mac_value = BOND_FOM_NONE;
4298         }
4299
4300         if (lp_interval == 0) {
4301                 pr_warn("Warning: ip_interval must be between 1 and %d, so it was reset to %d\n",
4302                         INT_MAX, BOND_ALB_DEFAULT_LP_INTERVAL);
4303                 lp_interval = BOND_ALB_DEFAULT_LP_INTERVAL;
4304         }
4305
4306         /* fill params struct with the proper values */
4307         params->mode = bond_mode;
4308         params->xmit_policy = xmit_hashtype;
4309         params->miimon = miimon;
4310         params->num_peer_notif = num_peer_notif;
4311         params->arp_interval = arp_interval;
4312         params->arp_validate = arp_validate_value;
4313         params->arp_all_targets = arp_all_targets_value;
4314         params->updelay = updelay;
4315         params->downdelay = downdelay;
4316         params->use_carrier = use_carrier;
4317         params->lacp_fast = lacp_fast;
4318         params->primary[0] = 0;
4319         params->primary_reselect = primary_reselect_value;
4320         params->fail_over_mac = fail_over_mac_value;
4321         params->tx_queues = tx_queues;
4322         params->all_slaves_active = all_slaves_active;
4323         params->resend_igmp = resend_igmp;
4324         params->min_links = min_links;
4325         params->lp_interval = lp_interval;
4326         params->packets_per_slave = packets_per_slave;
4327         params->tlb_dynamic_lb = 1; /* Default value */
4328         if (packets_per_slave > 0) {
4329                 params->reciprocal_packets_per_slave =
4330                         reciprocal_value(packets_per_slave);
4331         } else {
4332                 /* reciprocal_packets_per_slave is unused if
4333                  * packets_per_slave is 0 or 1, just initialize it
4334                  */
4335                 params->reciprocal_packets_per_slave =
4336                         (struct reciprocal_value) { 0 };
4337         }
4338
4339         if (primary) {
4340                 strncpy(params->primary, primary, IFNAMSIZ);
4341                 params->primary[IFNAMSIZ - 1] = 0;
4342         }
4343
4344         memcpy(params->arp_targets, arp_target, sizeof(arp_target));
4345
4346         return 0;
4347 }
4348
4349 static struct lock_class_key bonding_netdev_xmit_lock_key;
4350 static struct lock_class_key bonding_netdev_addr_lock_key;
4351 static struct lock_class_key bonding_tx_busylock_key;
4352
4353 static void bond_set_lockdep_class_one(struct net_device *dev,
4354                                        struct netdev_queue *txq,
4355                                        void *_unused)
4356 {
4357         lockdep_set_class(&txq->_xmit_lock,
4358                           &bonding_netdev_xmit_lock_key);
4359 }
4360
4361 static void bond_set_lockdep_class(struct net_device *dev)
4362 {
4363         lockdep_set_class(&dev->addr_list_lock,
4364                           &bonding_netdev_addr_lock_key);
4365         netdev_for_each_tx_queue(dev, bond_set_lockdep_class_one, NULL);
4366         dev->qdisc_tx_busylock = &bonding_tx_busylock_key;
4367 }
4368
4369 /*
4370  * Called from registration process
4371  */
4372 static int bond_init(struct net_device *bond_dev)
4373 {
4374         struct bonding *bond = netdev_priv(bond_dev);
4375         struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);
4376         struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
4377
4378         netdev_dbg(bond_dev, "Begin bond_init\n");
4379
4380         /*
4381          * Initialize locks that may be required during
4382          * en/deslave operations.  All of the bond_open work
4383          * (of which this is part) should really be moved to
4384          * a phase prior to dev_open
4385          */
4386         spin_lock_init(&(bond_info->tx_hashtbl_lock));
4387         spin_lock_init(&(bond_info->rx_hashtbl_lock));
4388
4389         bond->wq = create_singlethread_workqueue(bond_dev->name);
4390         if (!bond->wq)
4391                 return -ENOMEM;
4392
4393         bond_set_lockdep_class(bond_dev);
4394
4395         list_add_tail(&bond->bond_list, &bn->dev_list);
4396
4397         bond_prepare_sysfs_group(bond);
4398
4399         bond_debug_register(bond);
4400
4401         /* Ensure valid dev_addr */
4402         if (is_zero_ether_addr(bond_dev->dev_addr) &&
4403             bond_dev->addr_assign_type == NET_ADDR_PERM)
4404                 eth_hw_addr_random(bond_dev);
4405
4406         return 0;
4407 }
4408
4409 unsigned int bond_get_num_tx_queues(void)
4410 {
4411         return tx_queues;
4412 }
4413
4414 /* Create a new bond based on the specified name and bonding parameters.
4415  * If name is NULL, obtain a suitable "bond%d" name for us.
4416  * Caller must NOT hold rtnl_lock; we need to release it here before we
4417  * set up our sysfs entries.
4418  */
4419 int bond_create(struct net *net, const char *name)
4420 {
4421         struct net_device *bond_dev;
4422         int res;
4423
4424         rtnl_lock();
4425
4426         bond_dev = alloc_netdev_mq(sizeof(struct bonding),
4427                                    name ? name : "bond%d", NET_NAME_UNKNOWN,
4428                                    bond_setup, tx_queues);
4429         if (!bond_dev) {
4430                 pr_err("%s: eek! can't alloc netdev!\n", name);
4431                 rtnl_unlock();
4432                 return -ENOMEM;
4433         }
4434
4435         dev_net_set(bond_dev, net);
4436         bond_dev->rtnl_link_ops = &bond_link_ops;
4437
4438         res = register_netdevice(bond_dev);
4439
4440         netif_carrier_off(bond_dev);
4441
4442         rtnl_unlock();
4443         if (res < 0)
4444                 bond_destructor(bond_dev);
4445         return res;
4446 }
4447
4448 static int __net_init bond_net_init(struct net *net)
4449 {
4450         struct bond_net *bn = net_generic(net, bond_net_id);
4451
4452         bn->net = net;
4453         INIT_LIST_HEAD(&bn->dev_list);
4454
4455         bond_create_proc_dir(bn);
4456         bond_create_sysfs(bn);
4457
4458         return 0;
4459 }
4460
4461 static void __net_exit bond_net_exit(struct net *net)
4462 {
4463         struct bond_net *bn = net_generic(net, bond_net_id);
4464         struct bonding *bond, *tmp_bond;
4465         LIST_HEAD(list);
4466
4467         bond_destroy_sysfs(bn);
4468
4469         /* Kill off any bonds created after unregistering bond rtnl ops */
4470         rtnl_lock();
4471         list_for_each_entry_safe(bond, tmp_bond, &bn->dev_list, bond_list)
4472                 unregister_netdevice_queue(bond->dev, &list);
4473         unregister_netdevice_many(&list);
4474         rtnl_unlock();
4475
4476         bond_destroy_proc_dir(bn);
4477 }
4478
4479 static struct pernet_operations bond_net_ops = {
4480         .init = bond_net_init,
4481         .exit = bond_net_exit,
4482         .id   = &bond_net_id,
4483         .size = sizeof(struct bond_net),
4484 };
4485
4486 static int __init bonding_init(void)
4487 {
4488         int i;
4489         int res;
4490
4491         pr_info("%s", bond_version);
4492
4493         res = bond_check_params(&bonding_defaults);
4494         if (res)
4495                 goto out;
4496
4497         res = register_pernet_subsys(&bond_net_ops);
4498         if (res)
4499                 goto out;
4500
4501         res = bond_netlink_init();
4502         if (res)
4503                 goto err_link;
4504
4505         bond_create_debugfs();
4506
4507         for (i = 0; i < max_bonds; i++) {
4508                 res = bond_create(&init_net, NULL);
4509                 if (res)
4510                         goto err;
4511         }
4512
4513         register_netdevice_notifier(&bond_netdev_notifier);
4514 out:
4515         return res;
4516 err:
4517         bond_destroy_debugfs();
4518         bond_netlink_fini();
4519 err_link:
4520         unregister_pernet_subsys(&bond_net_ops);
4521         goto out;
4522
4523 }
4524
4525 static void __exit bonding_exit(void)
4526 {
4527         unregister_netdevice_notifier(&bond_netdev_notifier);
4528
4529         bond_destroy_debugfs();
4530
4531         bond_netlink_fini();
4532         unregister_pernet_subsys(&bond_net_ops);
4533
4534 #ifdef CONFIG_NET_POLL_CONTROLLER
4535         /*
4536          * Make sure we don't have an imbalance on our netpoll blocking
4537          */
4538         WARN_ON(atomic_read(&netpoll_block_tx));
4539 #endif
4540 }
4541
4542 module_init(bonding_init);
4543 module_exit(bonding_exit);
4544 MODULE_LICENSE("GPL");
4545 MODULE_VERSION(DRV_VERSION);
4546 MODULE_DESCRIPTION(DRV_DESCRIPTION ", v" DRV_VERSION);
4547 MODULE_AUTHOR("Thomas Davis, tadavis@lbl.gov and many others");