drivers/scsi/fcoe/fcoe_ctlr.c

   1 /*
   2  * Copyright (c) 2008-2009 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2009 Intel Corporation.  All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Maintained at www.Open-FCoE.org
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/list.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/timer.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/if_ether.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/errno.h>
  33 #include <linux/bitops.h>
  34 #include <linux/slab.h>
  35 #include <net/rtnetlink.h>
  36
  37 #include <scsi/fc/fc_els.h>
  38 #include <scsi/fc/fc_fs.h>
  39 #include <scsi/fc/fc_fip.h>
  40 #include <scsi/fc/fc_encaps.h>
  41 #include <scsi/fc/fc_fcoe.h>
  42 #include <scsi/fc/fc_fcp.h>
  43
  44 #include <scsi/libfc.h>
  45 #include <scsi/libfcoe.h>
  46
  47 #include "libfcoe.h"
  48
  49 #define FCOE_CTLR_MIN_FKA       500             /* min keep alive (mS) */
  50 #define FCOE_CTLR_DEF_FKA       FIP_DEF_FKA     /* default keep alive (mS) */
  51
  52 static void fcoe_ctlr_timeout(unsigned long);
  53 static void fcoe_ctlr_timer_work(struct work_struct *);
  54 static void fcoe_ctlr_recv_work(struct work_struct *);
  55 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *);
  56
  57 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *);
  58 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *, struct sk_buff *);
  59 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *);
  60 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *, u32, u8 *);
  61
  62 static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *, struct sk_buff *);
  63
  64 static u8 fcoe_all_fcfs[ETH_ALEN] = FIP_ALL_FCF_MACS;
  65 static u8 fcoe_all_enode[ETH_ALEN] = FIP_ALL_ENODE_MACS;
  66 static u8 fcoe_all_vn2vn[ETH_ALEN] = FIP_ALL_VN2VN_MACS;
  67 static u8 fcoe_all_p2p[ETH_ALEN] = FIP_ALL_P2P_MACS;
  68
  69 static const char * const fcoe_ctlr_states[] = {
  70         [FIP_ST_DISABLED] =     "DISABLED",
  71         [FIP_ST_LINK_WAIT] =    "LINK_WAIT",
  72         [FIP_ST_AUTO] =         "AUTO",
  73         [FIP_ST_NON_FIP] =      "NON_FIP",
  74         [FIP_ST_ENABLED] =      "ENABLED",
  75         [FIP_ST_VNMP_START] =   "VNMP_START",
  76         [FIP_ST_VNMP_PROBE1] =  "VNMP_PROBE1",
  77         [FIP_ST_VNMP_PROBE2] =  "VNMP_PROBE2",
  78         [FIP_ST_VNMP_CLAIM] =   "VNMP_CLAIM",
  79         [FIP_ST_VNMP_UP] =      "VNMP_UP",
  80 };
  81
  82 static const char *fcoe_ctlr_state(enum fip_state state)
  83 {
  84         const char *cp = "unknown";
  85
  86         if (state < ARRAY_SIZE(fcoe_ctlr_states))
  87                 cp = fcoe_ctlr_states[state];
  88         if (!cp)
  89                 cp = "unknown";
  90         return cp;
  91 }
  92
  93 /**
  94  * fcoe_ctlr_set_state() - Set and do debug printing for the new FIP state.
  95  * @fip: The FCoE controller
  96  * @state: The new state
  97  */
  98 static void fcoe_ctlr_set_state(struct fcoe_ctlr *fip, enum fip_state state)
  99 {
 100         if (state == fip->state)
 101                 return;
 102         if (fip->lp)
 103                 LIBFCOE_FIP_DBG(fip, "state %s -> %s\n",
 104                         fcoe_ctlr_state(fip->state), fcoe_ctlr_state(state));
 105         fip->state = state;
 106 }
 107
 108 /**
 109  * fcoe_ctlr_mtu_valid() - Check if a FCF's MTU is valid
 110  * @fcf: The FCF to check
 111  *
 112  * Return non-zero if FCF fcoe_size has been validated.
 113  */
 114 static inline int fcoe_ctlr_mtu_valid(const struct fcoe_fcf *fcf)
 115 {
 116         return (fcf->flags & FIP_FL_SOL) != 0;
 117 }
 118
 119 /**
 120  * fcoe_ctlr_fcf_usable() - Check if a FCF is usable
 121  * @fcf: The FCF to check
 122  *
 123  * Return non-zero if the FCF is usable.
 124  */
 125 static inline int fcoe_ctlr_fcf_usable(struct fcoe_fcf *fcf)
 126 {
 127         u16 flags = FIP_FL_SOL | FIP_FL_AVAIL;
 128
 129         return (fcf->flags & flags) == flags;
 130 }
 131
 132 /**
 133  * fcoe_ctlr_map_dest() - Set flag and OUI for mapping destination addresses
 134  * @fip: The FCoE controller
 135  */
 136 static void fcoe_ctlr_map_dest(struct fcoe_ctlr *fip)
 137 {
 138         if (fip->mode == FIP_MODE_VN2VN)
 139                 hton24(fip->dest_addr, FIP_VN_FC_MAP);
 140         else
 141                 hton24(fip->dest_addr, FIP_DEF_FC_MAP);
 142         hton24(fip->dest_addr + 3, 0);
 143         fip->map_dest = 1;
 144 }
 145
 146 /**
 147  * fcoe_ctlr_init() - Initialize the FCoE Controller instance
 148  * @fip: The FCoE controller to initialize
 149  */
 150 void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
 151 {
 152         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 153         fip->mode = mode;
 154         fip->fip_resp = false;
 155         INIT_LIST_HEAD(&fip->fcfs);
 156         mutex_init(&fip->ctlr_mutex);
 157         spin_lock_init(&fip->ctlr_lock);
 158         fip->flogi_oxid = FC_XID_UNKNOWN;
 159         setup_timer(&fip->timer, fcoe_ctlr_timeout, (unsigned long)fip);
 160         INIT_WORK(&fip->timer_work, fcoe_ctlr_timer_work);
 161         INIT_WORK(&fip->recv_work, fcoe_ctlr_recv_work);
 162         skb_queue_head_init(&fip->fip_recv_list);
 163 }
 164 EXPORT_SYMBOL(fcoe_ctlr_init);
 165
 166 /**
 167  * fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 168  * @new: The newly discovered FCF
 169  *
 170  * Called with fip->ctlr_mutex held
 171  */
 172 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 173 {
 174         struct fcoe_ctlr *fip = new->fip;
 175         struct fcoe_ctlr_device *ctlr_dev;
 176         struct fcoe_fcf_device *temp, *fcf_dev;
 177         int rc = -ENOMEM;
 178
 179         LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
 180                         new->fabric_name, new->fcf_mac);
 181
 182         temp = kzalloc(sizeof(*temp), GFP_KERNEL);
 183         if (!temp)
 184                 goto out;
 185
 186         temp->fabric_name = new->fabric_name;
 187         temp->switch_name = new->switch_name;
 188         temp->fc_map = new->fc_map;
 189         temp->vfid = new->vfid;
 190         memcpy(temp->mac, new->fcf_mac, ETH_ALEN);
 191         temp->priority = new->pri;
 192         temp->fka_period = new->fka_period;
 193         temp->selected = 0; /* default to unselected */
 194
 195         /*
 196          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 197          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
 198          * fnic would be an example of a driver with this behavior. In this
 199          * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
 200          * don't want to make sysfs changes.
 201          */
 202
 203         ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
 204         if (ctlr_dev) {
 205                 mutex_lock(&ctlr_dev->lock);
 206                 fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
 207                 if (unlikely(!fcf_dev)) {
 208                         rc = -ENOMEM;
 209                         mutex_unlock(&ctlr_dev->lock);
 210                         goto out;
 211                 }
 212
 213                 /*
 214                  * The fcoe_sysfs layer can return a CONNECTED fcf that
 215                  * has a priv (fcf was never deleted) or a CONNECTED fcf
 216                  * that doesn't have a priv (fcf was deleted). However,
 217                  * libfcoe will always delete FCFs before trying to add
 218                  * them. This is ensured because both recv_adv and
 219                  * age_fcfs are protected by the the fcoe_ctlr's mutex.
 220                  * This means that we should never get a FCF with a
 221                  * non-NULL priv pointer.
 222                  */
 223                 BUG_ON(fcf_dev->priv);
 224
 225                 fcf_dev->priv = new;
 226                 new->fcf_dev = fcf_dev;
 227                 mutex_unlock(&ctlr_dev->lock);
 228         }
 229
 230         list_add(&new->list, &fip->fcfs);
 231         fip->fcf_count++;
 232         rc = 0;
 233
 234 out:
 235         kfree(temp);
 236         return rc;
 237 }
 238
 239 /**
 240  * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
 241  * @new: The FCF to be removed
 242  *
 243  * Called with fip->ctlr_mutex held
 244  */
 245 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
 246 {
 247         struct fcoe_ctlr *fip = new->fip;
 248         struct fcoe_ctlr_device *cdev;
 249         struct fcoe_fcf_device *fcf_dev;
 250
 251         list_del(&new->list);
 252         fip->fcf_count--;
 253
 254         /*
 255          * If ctlr_dev doesn't exist then it means we're a libfcoe user
 256          * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
 257          * or a fcoe_fcf_device.
 258          *
 259          * fnic would be an example of a driver with this behavior. In this
 260          * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
 261          * but we don't want to make sysfs changes.
 262          */
 263         cdev = fcoe_ctlr_to_ctlr_dev(fip);
 264         if (cdev) {
 265                 mutex_lock(&cdev->lock);
 266                 fcf_dev = fcoe_fcf_to_fcf_dev(new);
 267                 WARN_ON(!fcf_dev);
 268                 new->fcf_dev = NULL;
 269                 fcoe_fcf_device_delete(fcf_dev);
 270                 kfree(new);
 271                 mutex_unlock(&cdev->lock);
 272         }
 273 }
 274
 275 /**
 276  * fcoe_ctlr_reset_fcfs() - Reset and free all FCFs for a controller
 277  * @fip: The FCoE controller whose FCFs are to be reset
 278  *
 279  * Called with &fcoe_ctlr lock held.
 280  */
 281 static void fcoe_ctlr_reset_fcfs(struct fcoe_ctlr *fip)
 282 {
 283         struct fcoe_fcf *fcf;
 284         struct fcoe_fcf *next;
 285
 286         fip->sel_fcf = NULL;
 287         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 288                 fcoe_sysfs_fcf_del(fcf);
 289         }
 290         WARN_ON(fip->fcf_count);
 291
 292         fip->sel_time = 0;
 293 }
 294
 295 /**
 296  * fcoe_ctlr_destroy() - Disable and tear down a FCoE controller
 297  * @fip: The FCoE controller to tear down
 298  *
 299  * This is called by FCoE drivers before freeing the &fcoe_ctlr.
 300  *
 301  * The receive handler will have been deleted before this to guarantee
 302  * that no more recv_work will be scheduled.
 303  *
 304  * The timer routine will simply return once we set FIP_ST_DISABLED.
 305  * This guarantees that no further timeouts or work will be scheduled.
 306  */
 307 void fcoe_ctlr_destroy(struct fcoe_ctlr *fip)
 308 {
 309         cancel_work_sync(&fip->recv_work);
 310         skb_queue_purge(&fip->fip_recv_list);
 311
 312         mutex_lock(&fip->ctlr_mutex);
 313         fcoe_ctlr_set_state(fip, FIP_ST_DISABLED);
 314         fcoe_ctlr_reset_fcfs(fip);
 315         mutex_unlock(&fip->ctlr_mutex);
 316         del_timer_sync(&fip->timer);
 317         cancel_work_sync(&fip->timer_work);
 318 }
 319 EXPORT_SYMBOL(fcoe_ctlr_destroy);
 320
 321 /**
 322  * fcoe_ctlr_announce() - announce new FCF selection
 323  * @fip: The FCoE controller
 324  *
 325  * Also sets the destination MAC for FCoE and control packets
 326  *
 327  * Called with neither ctlr_mutex nor ctlr_lock held.
 328  */
 329 static void fcoe_ctlr_announce(struct fcoe_ctlr *fip)
 330 {
 331         struct fcoe_fcf *sel;
 332         struct fcoe_fcf *fcf;
 333
 334         mutex_lock(&fip->ctlr_mutex);
 335         spin_lock_bh(&fip->ctlr_lock);
 336
 337         kfree_skb(fip->flogi_req);
 338         fip->flogi_req = NULL;
 339         list_for_each_entry(fcf, &fip->fcfs, list)
 340                 fcf->flogi_sent = 0;
 341
 342         spin_unlock_bh(&fip->ctlr_lock);
 343         sel = fip->sel_fcf;
 344
 345         if (sel && ether_addr_equal(sel->fcf_mac, fip->dest_addr))
 346                 goto unlock;
 347         if (!is_zero_ether_addr(fip->dest_addr)) {
 348                 printk(KERN_NOTICE "libfcoe: host%d: "
 349                        "FIP Fibre-Channel Forwarder MAC %pM deselected\n",
 350                        fip->lp->host->host_no, fip->dest_addr);
 351                 memset(fip->dest_addr, 0, ETH_ALEN);
 352         }
 353         if (sel) {
 354                 printk(KERN_INFO "libfcoe: host%d: FIP selected "
 355                        "Fibre-Channel Forwarder MAC %pM\n",
 356                        fip->lp->host->host_no, sel->fcf_mac);
 357                 memcpy(fip->dest_addr, sel->fcoe_mac, ETH_ALEN);
 358                 fip->map_dest = 0;
 359         }
 360 unlock:
 361         mutex_unlock(&fip->ctlr_mutex);
 362 }
 363
 364 /**
 365  * fcoe_ctlr_fcoe_size() - Return the maximum FCoE size required for VN_Port
 366  * @fip: The FCoE controller to get the maximum FCoE size from
 367  *
 368  * Returns the maximum packet size including the FCoE header and trailer,
 369  * but not including any Ethernet or VLAN headers.
 370  */
 371 static inline u32 fcoe_ctlr_fcoe_size(struct fcoe_ctlr *fip)
 372 {
 373         /*
 374          * Determine the max FCoE frame size allowed, including
 375          * FCoE header and trailer.
 376          * Note:  lp->mfs is currently the payload size, not the frame size.
 377          */
 378         return fip->lp->mfs + sizeof(struct fc_frame_header) +
 379                 sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof);
 380 }
 381
 382 /**
 383  * fcoe_ctlr_solicit() - Send a FIP solicitation
 384  * @fip: The FCoE controller to send the solicitation on
 385  * @fcf: The destination FCF (if NULL, a multicast solicitation is sent)
 386  */
 387 static void fcoe_ctlr_solicit(struct fcoe_ctlr *fip, struct fcoe_fcf *fcf)
 388 {
 389         struct sk_buff *skb;
 390         struct fip_sol {
 391                 struct ethhdr eth;
 392                 struct fip_header fip;
 393                 struct {
 394                         struct fip_mac_desc mac;
 395                         struct fip_wwn_desc wwnn;
 396                         struct fip_size_desc size;
 397                 } __packed desc;
 398         }  __packed * sol;
 399         u32 fcoe_size;
 400
 401         skb = dev_alloc_skb(sizeof(*sol));
 402         if (!skb)
 403                 return;
 404
 405         sol = (struct fip_sol *)skb->data;
 406
 407         memset(sol, 0, sizeof(*sol));
 408         memcpy(sol->eth.h_dest, fcf ? fcf->fcf_mac : fcoe_all_fcfs, ETH_ALEN);
 409         memcpy(sol->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 410         sol->eth.h_proto = htons(ETH_P_FIP);
 411
 412         sol->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 413         sol->fip.fip_op = htons(FIP_OP_DISC);
 414         sol->fip.fip_subcode = FIP_SC_SOL;
 415         sol->fip.fip_dl_len = htons(sizeof(sol->desc) / FIP_BPW);
 416         sol->fip.fip_flags = htons(FIP_FL_FPMA);
 417         if (fip->spma)
 418                 sol->fip.fip_flags |= htons(FIP_FL_SPMA);
 419
 420         sol->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
 421         sol->desc.mac.fd_desc.fip_dlen = sizeof(sol->desc.mac) / FIP_BPW;
 422         memcpy(sol->desc.mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 423
 424         sol->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
 425         sol->desc.wwnn.fd_desc.fip_dlen = sizeof(sol->desc.wwnn) / FIP_BPW;
 426         put_unaligned_be64(fip->lp->wwnn, &sol->desc.wwnn.fd_wwn);
 427
 428         fcoe_size = fcoe_ctlr_fcoe_size(fip);
 429         sol->desc.size.fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
 430         sol->desc.size.fd_desc.fip_dlen = sizeof(sol->desc.size) / FIP_BPW;
 431         sol->desc.size.fd_size = htons(fcoe_size);
 432
 433         skb_put(skb, sizeof(*sol));
 434         skb->protocol = htons(ETH_P_FIP);
 435         skb->priority = fip->priority;
 436         skb_reset_mac_header(skb);
 437         skb_reset_network_header(skb);
 438         fip->send(fip, skb);
 439
 440         if (!fcf)
 441                 fip->sol_time = jiffies;
 442 }
 443
 444 /**
 445  * fcoe_ctlr_link_up() - Start FCoE controller
 446  * @fip: The FCoE controller to start
 447  *
 448  * Called from the LLD when the network link is ready.
 449  */
 450 void fcoe_ctlr_link_up(struct fcoe_ctlr *fip)
 451 {
 452         mutex_lock(&fip->ctlr_mutex);
 453         if (fip->state == FIP_ST_NON_FIP || fip->state == FIP_ST_AUTO) {
 454                 mutex_unlock(&fip->ctlr_mutex);
 455                 fc_linkup(fip->lp);
 456         } else if (fip->state == FIP_ST_LINK_WAIT) {
 457                 fcoe_ctlr_set_state(fip, fip->mode);
 458                 switch (fip->mode) {
 459                 default:
 460                         LIBFCOE_FIP_DBG(fip, "invalid mode %d\n", fip->mode);
 461                         /* fall-through */
 462                 case FIP_MODE_AUTO:
 463                         LIBFCOE_FIP_DBG(fip, "%s", "setting AUTO mode.\n");
 464                         /* fall-through */
 465                 case FIP_MODE_FABRIC:
 466                 case FIP_MODE_NON_FIP:
 467                         mutex_unlock(&fip->ctlr_mutex);
 468                         fc_linkup(fip->lp);
 469                         fcoe_ctlr_solicit(fip, NULL);
 470                         break;
 471                 case FIP_MODE_VN2VN:
 472                         fcoe_ctlr_vn_start(fip);
 473                         mutex_unlock(&fip->ctlr_mutex);
 474                         fc_linkup(fip->lp);
 475                         break;
 476                 }
 477         } else
 478                 mutex_unlock(&fip->ctlr_mutex);
 479 }
 480 EXPORT_SYMBOL(fcoe_ctlr_link_up);
 481
 482 /**
 483  * fcoe_ctlr_reset() - Reset a FCoE controller
 484  * @fip:       The FCoE controller to reset
 485  */
 486 static void fcoe_ctlr_reset(struct fcoe_ctlr *fip)
 487 {
 488         fcoe_ctlr_reset_fcfs(fip);
 489         del_timer(&fip->timer);
 490         fip->ctlr_ka_time = 0;
 491         fip->port_ka_time = 0;
 492         fip->sol_time = 0;
 493         fip->flogi_oxid = FC_XID_UNKNOWN;
 494         fcoe_ctlr_map_dest(fip);
 495 }
 496
 497 /**
 498  * fcoe_ctlr_link_down() - Stop a FCoE controller
 499  * @fip: The FCoE controller to be stopped
 500  *
 501  * Returns non-zero if the link was up and now isn't.
 502  *
 503  * Called from the LLD when the network link is not ready.
 504  * There may be multiple calls while the link is down.
 505  */
 506 int fcoe_ctlr_link_down(struct fcoe_ctlr *fip)
 507 {
 508         int link_dropped;
 509
 510         LIBFCOE_FIP_DBG(fip, "link down.\n");
 511         mutex_lock(&fip->ctlr_mutex);
 512         fcoe_ctlr_reset(fip);
 513         link_dropped = fip->state != FIP_ST_LINK_WAIT;
 514         fcoe_ctlr_set_state(fip, FIP_ST_LINK_WAIT);
 515         mutex_unlock(&fip->ctlr_mutex);
 516
 517         if (link_dropped)
 518                 fc_linkdown(fip->lp);
 519         return link_dropped;
 520 }
 521 EXPORT_SYMBOL(fcoe_ctlr_link_down);
 522
 523 /**
 524  * fcoe_ctlr_send_keep_alive() - Send a keep-alive to the selected FCF
 525  * @fip:   The FCoE controller to send the FKA on
 526  * @lport: libfc fc_lport to send from
 527  * @ports: 0 for controller keep-alive, 1 for port keep-alive
 528  * @sa:    The source MAC address
 529  *
 530  * A controller keep-alive is sent every fka_period (typically 8 seconds).
 531  * The source MAC is the native MAC address.
 532  *
 533  * A port keep-alive is sent every 90 seconds while logged in.
 534  * The source MAC is the assigned mapped source address.
 535  * The destination is the FCF's F-port.
 536  */
 537 static void fcoe_ctlr_send_keep_alive(struct fcoe_ctlr *fip,
 538                                       struct fc_lport *lport,
 539                                       int ports, u8 *sa)
 540 {
 541         struct sk_buff *skb;
 542         struct fip_kal {
 543                 struct ethhdr eth;
 544                 struct fip_header fip;
 545                 struct fip_mac_desc mac;
 546         } __packed * kal;
 547         struct fip_vn_desc *vn;
 548         u32 len;
 549         struct fc_lport *lp;
 550         struct fcoe_fcf *fcf;
 551
 552         fcf = fip->sel_fcf;
 553         lp = fip->lp;
 554         if (!fcf || (ports && !lp->port_id))
 555                 return;
 556
 557         len = sizeof(*kal) + ports * sizeof(*vn);
 558         skb = dev_alloc_skb(len);
 559         if (!skb)
 560                 return;
 561
 562         kal = (struct fip_kal *)skb->data;
 563         memset(kal, 0, len);
 564         memcpy(kal->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 565         memcpy(kal->eth.h_source, sa, ETH_ALEN);
 566         kal->eth.h_proto = htons(ETH_P_FIP);
 567
 568         kal->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 569         kal->fip.fip_op = htons(FIP_OP_CTRL);
 570         kal->fip.fip_subcode = FIP_SC_KEEP_ALIVE;
 571         kal->fip.fip_dl_len = htons((sizeof(kal->mac) +
 572                                      ports * sizeof(*vn)) / FIP_BPW);
 573         kal->fip.fip_flags = htons(FIP_FL_FPMA);
 574         if (fip->spma)
 575                 kal->fip.fip_flags |= htons(FIP_FL_SPMA);
 576
 577         kal->mac.fd_desc.fip_dtype = FIP_DT_MAC;
 578         kal->mac.fd_desc.fip_dlen = sizeof(kal->mac) / FIP_BPW;
 579         memcpy(kal->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
 580         if (ports) {
 581                 vn = (struct fip_vn_desc *)(kal + 1);
 582                 vn->fd_desc.fip_dtype = FIP_DT_VN_ID;
 583                 vn->fd_desc.fip_dlen = sizeof(*vn) / FIP_BPW;
 584                 memcpy(vn->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 585                 hton24(vn->fd_fc_id, lport->port_id);
 586                 put_unaligned_be64(lport->wwpn, &vn->fd_wwpn);
 587         }
 588         skb_put(skb, len);
 589         skb->protocol = htons(ETH_P_FIP);
 590         skb->priority = fip->priority;
 591         skb_reset_mac_header(skb);
 592         skb_reset_network_header(skb);
 593         fip->send(fip, skb);
 594 }
 595
 596 /**
 597  * fcoe_ctlr_encaps() - Encapsulate an ELS frame for FIP, without sending it
 598  * @fip:   The FCoE controller for the ELS frame
 599  * @dtype: The FIP descriptor type for the frame
 600  * @skb:   The FCoE ELS frame including FC header but no FCoE headers
 601  * @d_id:  The destination port ID.
 602  *
 603  * Returns non-zero error code on failure.
 604  *
 605  * The caller must check that the length is a multiple of 4.
 606  *
 607  * The @skb must have enough headroom (28 bytes) and tailroom (8 bytes).
 608  * Headroom includes the FIP encapsulation description, FIP header, and
 609  * Ethernet header.  The tailroom is for the FIP MAC descriptor.
 610  */
 611 static int fcoe_ctlr_encaps(struct fcoe_ctlr *fip, struct fc_lport *lport,
 612                             u8 dtype, struct sk_buff *skb, u32 d_id)
 613 {
 614         struct fip_encaps_head {
 615                 struct ethhdr eth;
 616                 struct fip_header fip;
 617                 struct fip_encaps encaps;
 618         } __packed * cap;
 619         struct fc_frame_header *fh;
 620         struct fip_mac_desc *mac;
 621         struct fcoe_fcf *fcf;
 622         size_t dlen;
 623         u16 fip_flags;
 624         u8 op;
 625
 626         fh = (struct fc_frame_header *)skb->data;
 627         op = *(u8 *)(fh + 1);
 628         dlen = sizeof(struct fip_encaps) + skb->len;    /* len before push */
 629         cap = (struct fip_encaps_head *)skb_push(skb, sizeof(*cap));
 630         memset(cap, 0, sizeof(*cap));
 631
 632         if (lport->point_to_multipoint) {
 633                 if (fcoe_ctlr_vn_lookup(fip, d_id, cap->eth.h_dest))
 634                         return -ENODEV;
 635                 fip_flags = 0;
 636         } else {
 637                 fcf = fip->sel_fcf;
 638                 if (!fcf)
 639                         return -ENODEV;
 640                 fip_flags = fcf->flags;
 641                 fip_flags &= fip->spma ? FIP_FL_SPMA | FIP_FL_FPMA :
 642                                          FIP_FL_FPMA;
 643                 if (!fip_flags)
 644                         return -ENODEV;
 645                 memcpy(cap->eth.h_dest, fcf->fcf_mac, ETH_ALEN);
 646         }
 647         memcpy(cap->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
 648         cap->eth.h_proto = htons(ETH_P_FIP);
 649
 650         cap->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
 651         cap->fip.fip_op = htons(FIP_OP_LS);
 652         if (op == ELS_LS_ACC || op == ELS_LS_RJT)
 653                 cap->fip.fip_subcode = FIP_SC_REP;
 654         else
 655                 cap->fip.fip_subcode = FIP_SC_REQ;
 656         cap->fip.fip_flags = htons(fip_flags);
 657
 658         cap->encaps.fd_desc.fip_dtype = dtype;
 659         cap->encaps.fd_desc.fip_dlen = dlen / FIP_BPW;
 660
 661         if (op != ELS_LS_RJT) {
 662                 dlen += sizeof(*mac);
 663                 mac = (struct fip_mac_desc *)skb_put(skb, sizeof(*mac));
 664                 memset(mac, 0, sizeof(*mac));
 665                 mac->fd_desc.fip_dtype = FIP_DT_MAC;
 666                 mac->fd_desc.fip_dlen = sizeof(*mac) / FIP_BPW;
 667                 if (dtype != FIP_DT_FLOGI && dtype != FIP_DT_FDISC) {
 668                         memcpy(mac->fd_mac, fip->get_src_addr(lport), ETH_ALEN);
 669                 } else if (fip->mode == FIP_MODE_VN2VN) {
 670                         hton24(mac->fd_mac, FIP_VN_FC_MAP);
 671                         hton24(mac->fd_mac + 3, fip->port_id);
 672                 } else if (fip_flags & FIP_FL_SPMA) {
 673                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with SPMA\n");
 674                         memcpy(mac->fd_mac, fip->ctl_src_addr, ETH_ALEN);
 675                 } else {
 676                         LIBFCOE_FIP_DBG(fip, "FLOGI/FDISC sent with FPMA\n");
 677                         /* FPMA only FLOGI.  Must leave the MAC desc zeroed. */
 678                 }
 679         }
 680         cap->fip.fip_dl_len = htons(dlen / FIP_BPW);
 681
 682         skb->protocol = htons(ETH_P_FIP);
 683         skb->priority = fip->priority;
 684         skb_reset_mac_header(skb);
 685         skb_reset_network_header(skb);
 686         return 0;
 687 }
 688
 689 /**
 690  * fcoe_ctlr_els_send() - Send an ELS frame encapsulated by FIP if appropriate.
 691  * @fip:        FCoE controller.
 692  * @lport:      libfc fc_lport to send from
 693  * @skb:        FCoE ELS frame including FC header but no FCoE headers.
 694  *
 695  * Returns a non-zero error code if the frame should not be sent.
 696  * Returns zero if the caller should send the frame with FCoE encapsulation.
 697  *
 698  * The caller must check that the length is a multiple of 4.
 699  * The SKB must have enough headroom (28 bytes) and tailroom (8 bytes).
 700  * The the skb must also be an fc_frame.
 701  *
 702  * This is called from the lower-level driver with spinlocks held,
 703  * so we must not take a mutex here.
 704  */
 705 int fcoe_ctlr_els_send(struct fcoe_ctlr *fip, struct fc_lport *lport,
 706                        struct sk_buff *skb)
 707 {
 708         struct fc_frame *fp;
 709         struct fc_frame_header *fh;
 710         u16 old_xid;
 711         u8 op;
 712         u8 mac[ETH_ALEN];
 713
 714         fp = container_of(skb, struct fc_frame, skb);
 715         fh = (struct fc_frame_header *)skb->data;
 716         op = *(u8 *)(fh + 1);
 717
 718         if (op == ELS_FLOGI && fip->mode != FIP_MODE_VN2VN) {
 719                 old_xid = fip->flogi_oxid;
 720                 fip->flogi_oxid = ntohs(fh->fh_ox_id);
 721                 if (fip->state == FIP_ST_AUTO) {
 722                         if (old_xid == FC_XID_UNKNOWN)
 723                                 fip->flogi_count = 0;
 724                         fip->flogi_count++;
 725                         if (fip->flogi_count < 3)
 726                                 goto drop;
 727                         fcoe_ctlr_map_dest(fip);
 728                         return 0;
 729                 }
 730                 if (fip->state == FIP_ST_NON_FIP)
 731                         fcoe_ctlr_map_dest(fip);
 732         }
 733
 734         if (fip->state == FIP_ST_NON_FIP)
 735                 return 0;
 736         if (!fip->sel_fcf && fip->mode != FIP_MODE_VN2VN)
 737                 goto drop;
 738         switch (op) {
 739         case ELS_FLOGI:
 740                 op = FIP_DT_FLOGI;
 741                 if (fip->mode == FIP_MODE_VN2VN)
 742                         break;
 743                 spin_lock_bh(&fip->ctlr_lock);
 744                 kfree_skb(fip->flogi_req);
 745                 fip->flogi_req = skb;
 746                 fip->flogi_req_send = 1;
 747                 spin_unlock_bh(&fip->ctlr_lock);
 748                 schedule_work(&fip->timer_work);
 749                 return -EINPROGRESS;
 750         case ELS_FDISC:
 751                 if (ntoh24(fh->fh_s_id))
 752                         return 0;
 753                 op = FIP_DT_FDISC;
 754                 break;
 755         case ELS_LOGO:
 756                 if (fip->mode == FIP_MODE_VN2VN) {
 757                         if (fip->state != FIP_ST_VNMP_UP)
 758                                 return -EINVAL;
 759                         if (ntoh24(fh->fh_d_id) == FC_FID_FLOGI)
 760                                 return -EINVAL;
 761                 } else {
 762                         if (fip->state != FIP_ST_ENABLED)
 763                                 return 0;
 764                         if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
 765                                 return 0;
 766                 }
 767                 op = FIP_DT_LOGO;
 768                 break;
 769         case ELS_LS_ACC:
 770                 /*
 771                  * If non-FIP, we may have gotten an SID by accepting an FLOGI
 772                  * from a point-to-point connection.  Switch to using
 773                  * the source mac based on the SID.  The destination
 774                  * MAC in this case would have been set by receiving the
 775                  * FLOGI.
 776                  */
 777                 if (fip->state == FIP_ST_NON_FIP) {
 778                         if (fip->flogi_oxid == FC_XID_UNKNOWN)
 779                                 return 0;
 780                         fip->flogi_oxid = FC_XID_UNKNOWN;
 781                         fc_fcoe_set_mac(mac, fh->fh_d_id);
 782                         fip->update_mac(lport, mac);
 783                 }
 784                 /* fall through */
 785         case ELS_LS_RJT:
 786                 op = fr_encaps(fp);
 787                 if (op)
 788                         break;
 789                 return 0;
 790         default:
 791                 if (fip->state != FIP_ST_ENABLED &&
 792                     fip->state != FIP_ST_VNMP_UP)
 793                         goto drop;
 794                 return 0;
 795         }
 796         LIBFCOE_FIP_DBG(fip, "els_send op %u d_id %x\n",
 797                         op, ntoh24(fh->fh_d_id));
 798         if (fcoe_ctlr_encaps(fip, lport, op, skb, ntoh24(fh->fh_d_id)))
 799                 goto drop;
 800         fip->send(fip, skb);
 801         return -EINPROGRESS;
 802 drop:
 803         kfree_skb(skb);
 804         return -EINVAL;
 805 }
 806 EXPORT_SYMBOL(fcoe_ctlr_els_send);
 807
 808 /**
 809  * fcoe_ctlr_age_fcfs() - Reset and free all old FCFs for a controller
 810  * @fip: The FCoE controller to free FCFs on
 811  *
 812  * Called with lock held and preemption disabled.
 813  *
 814  * An FCF is considered old if we have missed two advertisements.
 815  * That is, there have been no valid advertisement from it for 2.5
 816  * times its keep-alive period.
 817  *
 818  * In addition, determine the time when an FCF selection can occur.
 819  *
 820  * Also, increment the MissDiscAdvCount when no advertisement is received
 821  * for the corresponding FCF for 1.5 * FKA_ADV_PERIOD (FC-BB-5 LESB).
 822  *
 823  * Returns the time in jiffies for the next call.
 824  */
 825 static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 826 {
 827         struct fcoe_fcf *fcf;
 828         struct fcoe_fcf *next;
 829         unsigned long next_timer = jiffies + msecs_to_jiffies(FIP_VN_KA_PERIOD);
 830         unsigned long deadline;
 831         unsigned long sel_time = 0;
 832         struct list_head del_list;
 833         struct fc_stats *stats;
 834
 835         INIT_LIST_HEAD(&del_list);
 836
 837         stats = per_cpu_ptr(fip->lp->stats, get_cpu());
 838
 839         list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
 840                 deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
 841                 if (fip->sel_fcf == fcf) {
 842                         if (time_after(jiffies, deadline)) {
 843                                 stats->MissDiscAdvCount++;
 844                                 printk(KERN_INFO "libfcoe: host%d: "
 845                                        "Missing Discovery Advertisement "
 846                                        "for fab %16.16llx count %lld\n",
 847                                        fip->lp->host->host_no, fcf->fabric_name,
 848                                        stats->MissDiscAdvCount);
 849                         } else if (time_after(next_timer, deadline))
 850                                 next_timer = deadline;
 851                 }
 852
 853                 deadline += fcf->fka_period;
 854                 if (time_after_eq(jiffies, deadline)) {
 855                         if (fip->sel_fcf == fcf)
 856                                 fip->sel_fcf = NULL;
 857                         /*
 858                          * Move to delete list so we can call
 859                          * fcoe_sysfs_fcf_del (which can sleep)
 860                          * after the put_cpu().
 861                          */
 862                         list_del(&fcf->list);
 863                         list_add(&fcf->list, &del_list);
 864                         stats->VLinkFailureCount++;
 865                 } else {
 866                         if (time_after(next_timer, deadline))
 867                                 next_timer = deadline;
 868                         if (fcoe_ctlr_mtu_valid(fcf) &&
 869                             (!sel_time || time_before(sel_time, fcf->time)))
 870                                 sel_time = fcf->time;
 871                 }
 872         }
 873         put_cpu();
 874
 875         list_for_each_entry_safe(fcf, next, &del_list, list) {
 876                 /* Removes fcf from current list */
 877                 fcoe_sysfs_fcf_del(fcf);
 878         }
 879
 880         if (sel_time && !fip->sel_fcf && !fip->sel_time) {
 881                 sel_time += msecs_to_jiffies(FCOE_CTLR_START_DELAY);
 882                 fip->sel_time = sel_time;
 883         }
 884
 885         return next_timer;
 886 }
 887
 888 /**
 889  * fcoe_ctlr_parse_adv() - Decode a FIP advertisement into a new FCF entry
 890  * @fip: The FCoE controller receiving the advertisement
 891  * @skb: The received FIP advertisement frame
 892  * @fcf: The resulting FCF entry
 893  *
 894  * Returns zero on a valid parsed advertisement,
 895  * otherwise returns non zero value.
 896  */
 897 static int fcoe_ctlr_parse_adv(struct fcoe_ctlr *fip,
 898                                struct sk_buff *skb, struct fcoe_fcf *fcf)
 899 {
 900         struct fip_header *fiph;
 901         struct fip_desc *desc = NULL;
 902         struct fip_wwn_desc *wwn;
 903         struct fip_fab_desc *fab;
 904         struct fip_fka_desc *fka;
 905         unsigned long t;
 906         size_t rlen;
 907         size_t dlen;
 908         u32 desc_mask;
 909
 910         memset(fcf, 0, sizeof(*fcf));
 911         fcf->fka_period = msecs_to_jiffies(FCOE_CTLR_DEF_FKA);
 912
 913         fiph = (struct fip_header *)skb->data;
 914         fcf->flags = ntohs(fiph->fip_flags);
 915
 916         /*
 917          * mask of required descriptors. validating each one clears its bit.
 918          */
 919         desc_mask = BIT(FIP_DT_PRI) | BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
 920                         BIT(FIP_DT_FAB) | BIT(FIP_DT_FKA);
 921
 922         rlen = ntohs(fiph->fip_dl_len) * 4;
 923         if (rlen + sizeof(*fiph) > skb->len)
 924                 return -EINVAL;
 925
 926         desc = (struct fip_desc *)(fiph + 1);
 927         while (rlen > 0) {
 928                 dlen = desc->fip_dlen * FIP_BPW;
 929                 if (dlen < sizeof(*desc) || dlen > rlen)
 930                         return -EINVAL;
 931                 /* Drop Adv if there are duplicate critical descriptors */
 932                 if ((desc->fip_dtype < 32) &&
 933                     !(desc_mask & 1U << desc->fip_dtype)) {
 934                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
 935                                         "Descriptors in FIP adv\n");
 936                         return -EINVAL;
 937                 }
 938                 switch (desc->fip_dtype) {
 939                 case FIP_DT_PRI:
 940                         if (dlen != sizeof(struct fip_pri_desc))
 941                                 goto len_err;
 942                         fcf->pri = ((struct fip_pri_desc *)desc)->fd_pri;
 943                         desc_mask &= ~BIT(FIP_DT_PRI);
 944                         break;
 945                 case FIP_DT_MAC:
 946                         if (dlen != sizeof(struct fip_mac_desc))
 947                                 goto len_err;
 948                         memcpy(fcf->fcf_mac,
 949                                ((struct fip_mac_desc *)desc)->fd_mac,
 950                                ETH_ALEN);
 951                         memcpy(fcf->fcoe_mac, fcf->fcf_mac, ETH_ALEN);
 952                         if (!is_valid_ether_addr(fcf->fcf_mac)) {
 953                                 LIBFCOE_FIP_DBG(fip,
 954                                         "Invalid MAC addr %pM in FIP adv\n",
 955                                         fcf->fcf_mac);
 956                                 return -EINVAL;
 957                         }
 958                         desc_mask &= ~BIT(FIP_DT_MAC);
 959                         break;
 960                 case FIP_DT_NAME:
 961                         if (dlen != sizeof(struct fip_wwn_desc))
 962                                 goto len_err;
 963                         wwn = (struct fip_wwn_desc *)desc;
 964                         fcf->switch_name = get_unaligned_be64(&wwn->fd_wwn);
 965                         desc_mask &= ~BIT(FIP_DT_NAME);
 966                         break;
 967                 case FIP_DT_FAB:
 968                         if (dlen != sizeof(struct fip_fab_desc))
 969                                 goto len_err;
 970                         fab = (struct fip_fab_desc *)desc;
 971                         fcf->fabric_name = get_unaligned_be64(&fab->fd_wwn);
 972                         fcf->vfid = ntohs(fab->fd_vfid);
 973                         fcf->fc_map = ntoh24(fab->fd_map);
 974                         desc_mask &= ~BIT(FIP_DT_FAB);
 975                         break;
 976                 case FIP_DT_FKA:
 977                         if (dlen != sizeof(struct fip_fka_desc))
 978                                 goto len_err;
 979                         fka = (struct fip_fka_desc *)desc;
 980                         if (fka->fd_flags & FIP_FKA_ADV_D)
 981                                 fcf->fd_flags = 1;
 982                         t = ntohl(fka->fd_fka_period);
 983                         if (t >= FCOE_CTLR_MIN_FKA)
 984                                 fcf->fka_period = msecs_to_jiffies(t);
 985                         desc_mask &= ~BIT(FIP_DT_FKA);
 986                         break;
 987                 case FIP_DT_MAP_OUI:
 988                 case FIP_DT_FCOE_SIZE:
 989                 case FIP_DT_FLOGI:
 990                 case FIP_DT_FDISC:
 991                 case FIP_DT_LOGO:
 992                 case FIP_DT_ELP:
 993                 default:
 994                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
 995                                         "in FIP adv\n", desc->fip_dtype);
 996                         /* standard says ignore unknown descriptors >= 128 */
 997                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
 998                                 return -EINVAL;
 999                         break;
1000                 }
1001                 desc = (struct fip_desc *)((char *)desc + dlen);
1002                 rlen -= dlen;
1003         }
1004         if (!fcf->fc_map || (fcf->fc_map & 0x10000))
1005                 return -EINVAL;
1006         if (!fcf->switch_name)
1007                 return -EINVAL;
1008         if (desc_mask) {
1009                 LIBFCOE_FIP_DBG(fip, "adv missing descriptors mask %x\n",
1010                                 desc_mask);
1011                 return -EINVAL;
1012         }
1013         return 0;
1014
1015 len_err:
1016         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1017                         desc->fip_dtype, dlen);
1018         return -EINVAL;
1019 }
1020
1021 /**
1022  * fcoe_ctlr_recv_adv() - Handle an incoming advertisement
1023  * @fip: The FCoE controller receiving the advertisement
1024  * @skb: The received FIP packet
1025  */
1026 static void fcoe_ctlr_recv_adv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1027 {
1028         struct fcoe_fcf *fcf;
1029         struct fcoe_fcf new;
1030         unsigned long sol_tov = msecs_to_jiffies(FCOE_CTRL_SOL_TOV);
1031         int first = 0;
1032         int mtu_valid;
1033         int found = 0;
1034         int rc = 0;
1035
1036         if (fcoe_ctlr_parse_adv(fip, skb, &new))
1037                 return;
1038
1039         mutex_lock(&fip->ctlr_mutex);
1040         first = list_empty(&fip->fcfs);
1041         list_for_each_entry(fcf, &fip->fcfs, list) {
1042                 if (fcf->switch_name == new.switch_name &&
1043                     fcf->fabric_name == new.fabric_name &&
1044                     fcf->fc_map == new.fc_map &&
1045                     ether_addr_equal(fcf->fcf_mac, new.fcf_mac)) {
1046                         found = 1;
1047                         break;
1048                 }
1049         }
1050         if (!found) {
1051                 if (fip->fcf_count >= FCOE_CTLR_FCF_LIMIT)
1052                         goto out;
1053
1054                 fcf = kmalloc(sizeof(*fcf), GFP_ATOMIC);
1055                 if (!fcf)
1056                         goto out;
1057
1058                 memcpy(fcf, &new, sizeof(new));
1059                 fcf->fip = fip;
1060                 rc = fcoe_sysfs_fcf_add(fcf);
1061                 if (rc) {
1062                         printk(KERN_ERR "Failed to allocate sysfs instance "
1063                                "for FCF, fab %16.16llx mac %pM\n",
1064                                new.fabric_name, new.fcf_mac);
1065                         kfree(fcf);
1066                         goto out;
1067                 }
1068         } else {
1069                 /*
1070                  * Update the FCF's keep-alive descriptor flags.
1071                  * Other flag changes from new advertisements are
1072                  * ignored after a solicited advertisement is
1073                  * received and the FCF is selectable (usable).
1074                  */
1075                 fcf->fd_flags = new.fd_flags;
1076                 if (!fcoe_ctlr_fcf_usable(fcf))
1077                         fcf->flags = new.flags;
1078
1079                 if (fcf == fip->sel_fcf && !fcf->fd_flags) {
1080                         fip->ctlr_ka_time -= fcf->fka_period;
1081                         fip->ctlr_ka_time += new.fka_period;
1082                         if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1083                                 mod_timer(&fip->timer, fip->ctlr_ka_time);
1084                 }
1085                 fcf->fka_period = new.fka_period;
1086                 memcpy(fcf->fcf_mac, new.fcf_mac, ETH_ALEN);
1087         }
1088
1089         mtu_valid = fcoe_ctlr_mtu_valid(fcf);
1090         fcf->time = jiffies;
1091         if (!found)
1092                 LIBFCOE_FIP_DBG(fip, "New FCF fab %16.16llx mac %pM\n",
1093                                 fcf->fabric_name, fcf->fcf_mac);
1094
1095         /*
1096          * If this advertisement is not solicited and our max receive size
1097          * hasn't been verified, send a solicited advertisement.
1098          */
1099         if (!mtu_valid)
1100                 fcoe_ctlr_solicit(fip, fcf);
1101
1102         /*
1103          * If its been a while since we did a solicit, and this is
1104          * the first advertisement we've received, do a multicast
1105          * solicitation to gather as many advertisements as we can
1106          * before selection occurs.
1107          */
1108         if (first && time_after(jiffies, fip->sol_time + sol_tov))
1109                 fcoe_ctlr_solicit(fip, NULL);
1110
1111         /*
1112          * Put this FCF at the head of the list for priority among equals.
1113          * This helps in the case of an NPV switch which insists we use
1114          * the FCF that answers multicast solicitations, not the others that
1115          * are sending periodic multicast advertisements.
1116          */
1117         if (mtu_valid)
1118                 list_move(&fcf->list, &fip->fcfs);
1119
1120         /*
1121          * If this is the first validated FCF, note the time and
1122          * set a timer to trigger selection.
1123          */
1124         if (mtu_valid && !fip->sel_fcf && !fip->sel_time &&
1125             fcoe_ctlr_fcf_usable(fcf)) {
1126                 fip->sel_time = jiffies +
1127                         msecs_to_jiffies(FCOE_CTLR_START_DELAY);
1128                 if (!timer_pending(&fip->timer) ||
1129                     time_before(fip->sel_time, fip->timer.expires))
1130                         mod_timer(&fip->timer, fip->sel_time);
1131         }
1132
1133 out:
1134         mutex_unlock(&fip->ctlr_mutex);
1135 }
1136
1137 /**
1138  * fcoe_ctlr_recv_els() - Handle an incoming FIP encapsulated ELS frame
1139  * @fip: The FCoE controller which received the packet
1140  * @skb: The received FIP packet
1141  */
1142 static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
1143 {
1144         struct fc_lport *lport = fip->lp;
1145         struct fip_header *fiph;
1146         struct fc_frame *fp = (struct fc_frame *)skb;
1147         struct fc_frame_header *fh = NULL;
1148         struct fip_desc *desc;
1149         struct fip_encaps *els;
1150         struct fcoe_fcf *sel;
1151         struct fc_stats *stats;
1152         enum fip_desc_type els_dtype = 0;
1153         u8 els_op;
1154         u8 sub;
1155         u8 granted_mac[ETH_ALEN] = { 0 };
1156         size_t els_len = 0;
1157         size_t rlen;
1158         size_t dlen;
1159         u32 desc_mask = 0;
1160         u32 desc_cnt = 0;
1161
1162         fiph = (struct fip_header *)skb->data;
1163         sub = fiph->fip_subcode;
1164         if (sub != FIP_SC_REQ && sub != FIP_SC_REP)
1165                 goto drop;
1166
1167         rlen = ntohs(fiph->fip_dl_len) * 4;
1168         if (rlen + sizeof(*fiph) > skb->len)
1169                 goto drop;
1170
1171         desc = (struct fip_desc *)(fiph + 1);
1172         while (rlen > 0) {
1173                 desc_cnt++;
1174                 dlen = desc->fip_dlen * FIP_BPW;
1175                 if (dlen < sizeof(*desc) || dlen > rlen)
1176                         goto drop;
1177                 /* Drop ELS if there are duplicate critical descriptors */
1178                 if (desc->fip_dtype < 32) {
1179                         if ((desc->fip_dtype != FIP_DT_MAC) &&
1180                             (desc_mask & 1U << desc->fip_dtype)) {
1181                                 LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1182                                                 "Descriptors in FIP ELS\n");
1183                                 goto drop;
1184                         }
1185                         desc_mask |= (1 << desc->fip_dtype);
1186                 }
1187                 switch (desc->fip_dtype) {
1188                 case FIP_DT_MAC:
1189                         sel = fip->sel_fcf;
1190                         if (desc_cnt == 1) {
1191                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1192                                                 "received out of order\n");
1193                                 goto drop;
1194                         }
1195                         /*
1196                          * Some switch implementations send two MAC descriptors,
1197                          * with first MAC(granted_mac) being the FPMA, and the
1198                          * second one(fcoe_mac) is used as destination address
1199                          * for sending/receiving FCoE packets. FIP traffic is
1200                          * sent using fip_mac. For regular switches, both
1201                          * fip_mac and fcoe_mac would be the same.
1202                          */
1203                         if (desc_cnt == 2)
1204                                 memcpy(granted_mac,
1205                                        ((struct fip_mac_desc *)desc)->fd_mac,
1206                                        ETH_ALEN);
1207
1208                         if (dlen != sizeof(struct fip_mac_desc))
1209                                 goto len_err;
1210
1211                         if ((desc_cnt == 3) && (sel))
1212                                 memcpy(sel->fcoe_mac,
1213                                        ((struct fip_mac_desc *)desc)->fd_mac,
1214                                        ETH_ALEN);
1215                         break;
1216                 case FIP_DT_FLOGI:
1217                 case FIP_DT_FDISC:
1218                 case FIP_DT_LOGO:
1219                 case FIP_DT_ELP:
1220                         if (desc_cnt != 1) {
1221                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1222                                                 "received out of order\n");
1223                                 goto drop;
1224                         }
1225                         if (fh)
1226                                 goto drop;
1227                         if (dlen < sizeof(*els) + sizeof(*fh) + 1)
1228                                 goto len_err;
1229                         els_len = dlen - sizeof(*els);
1230                         els = (struct fip_encaps *)desc;
1231                         fh = (struct fc_frame_header *)(els + 1);
1232                         els_dtype = desc->fip_dtype;
1233                         break;
1234                 default:
1235                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
1236                                         "in FIP adv\n", desc->fip_dtype);
1237                         /* standard says ignore unknown descriptors >= 128 */
1238                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
1239                                 goto drop;
1240                         if (desc_cnt <= 2) {
1241                                 LIBFCOE_FIP_DBG(fip, "FIP descriptors "
1242                                                 "received out of order\n");
1243                                 goto drop;
1244                         }
1245                         break;
1246                 }
1247                 desc = (struct fip_desc *)((char *)desc + dlen);
1248                 rlen -= dlen;
1249         }
1250
1251         if (!fh)
1252                 goto drop;
1253         els_op = *(u8 *)(fh + 1);
1254
1255         if ((els_dtype == FIP_DT_FLOGI || els_dtype == FIP_DT_FDISC) &&
1256             sub == FIP_SC_REP && fip->mode != FIP_MODE_VN2VN) {
1257                 if (els_op == ELS_LS_ACC) {
1258                         if (!is_valid_ether_addr(granted_mac)) {
1259                                 LIBFCOE_FIP_DBG(fip,
1260                                         "Invalid MAC address %pM in FIP ELS\n",
1261                                         granted_mac);
1262                                 goto drop;
1263                         }
1264                         memcpy(fr_cb(fp)->granted_mac, granted_mac, ETH_ALEN);
1265
1266                         if (fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1267                                 fip->flogi_oxid = FC_XID_UNKNOWN;
1268                                 if (els_dtype == FIP_DT_FLOGI)
1269                                         fcoe_ctlr_announce(fip);
1270                         }
1271                 } else if (els_dtype == FIP_DT_FLOGI &&
1272                            !fcoe_ctlr_flogi_retry(fip))
1273                         goto drop;      /* retrying FLOGI so drop reject */
1274         }
1275
1276         if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
1277             (!(1U << FIP_DT_MAC & desc_mask)))) {
1278                 LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
1279                                 "in FIP ELS\n");
1280                 goto drop;
1281         }
1282
1283         /*
1284          * Convert skb into an fc_frame containing only the ELS.
1285          */
1286         skb_pull(skb, (u8 *)fh - skb->data);
1287         skb_trim(skb, els_len);
1288         fp = (struct fc_frame *)skb;
1289         fc_frame_init(fp);
1290         fr_sof(fp) = FC_SOF_I3;
1291         fr_eof(fp) = FC_EOF_T;
1292         fr_dev(fp) = lport;
1293         fr_encaps(fp) = els_dtype;
1294
1295         stats = per_cpu_ptr(lport->stats, get_cpu());
1296         stats->RxFrames++;
1297         stats->RxWords += skb->len / FIP_BPW;
1298         put_cpu();
1299
1300         fc_exch_recv(lport, fp);
1301         return;
1302
1303 len_err:
1304         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
1305                         desc->fip_dtype, dlen);
1306 drop:
1307         kfree_skb(skb);
1308 }
1309
1310 /**
1311  * fcoe_ctlr_recv_els() - Handle an incoming link reset frame
1312  * @fip: The FCoE controller that received the frame
1313  * @fh:  The received FIP header
1314  *
1315  * There may be multiple VN_Port descriptors.
1316  * The overall length has already been checked.
1317  */
1318 static void fcoe_ctlr_recv_clr_vlink(struct fcoe_ctlr *fip,
1319                                      struct fip_header *fh)
1320 {
1321         struct fip_desc *desc;
1322         struct fip_mac_desc *mp;
1323         struct fip_wwn_desc *wp;
1324         struct fip_vn_desc *vp;
1325         size_t rlen;
1326         size_t dlen;
1327         struct fcoe_fcf *fcf = fip->sel_fcf;
1328         struct fc_lport *lport = fip->lp;
1329         struct fc_lport *vn_port = NULL;
1330         u32 desc_mask;
1331         int num_vlink_desc;
1332         int reset_phys_port = 0;
1333         struct fip_vn_desc **vlink_desc_arr = NULL;
1334
1335         LIBFCOE_FIP_DBG(fip, "Clear Virtual Link received\n");
1336
1337         if (!fcf || !lport->port_id) {
1338                 /*
1339                  * We are yet to select best FCF, but we got CVL in the
1340                  * meantime. reset the ctlr and let it rediscover the FCF
1341                  */
1342                 mutex_lock(&fip->ctlr_mutex);
1343                 fcoe_ctlr_reset(fip);
1344                 mutex_unlock(&fip->ctlr_mutex);
1345                 return;
1346         }
1347
1348         /*
1349          * mask of required descriptors.  Validating each one clears its bit.
1350          */
1351         desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
1352
1353         rlen = ntohs(fh->fip_dl_len) * FIP_BPW;
1354         desc = (struct fip_desc *)(fh + 1);
1355
1356         /*
1357          * Actually need to subtract 'sizeof(*mp) - sizeof(*wp)' from 'rlen'
1358          * before determining max Vx_Port descriptor but a buggy FCF could have
1359          * omited either or both MAC Address and Name Identifier descriptors
1360          */
1361         num_vlink_desc = rlen / sizeof(*vp);
1362         if (num_vlink_desc)
1363                 vlink_desc_arr = kmalloc(sizeof(vp) * num_vlink_desc,
1364                                          GFP_ATOMIC);
1365         if (!vlink_desc_arr)
1366                 return;
1367         num_vlink_desc = 0;
1368
1369         while (rlen >= sizeof(*desc)) {
1370                 dlen = desc->fip_dlen * FIP_BPW;
1371                 if (dlen > rlen)
1372                         goto err;
1373                 /* Drop CVL if there are duplicate critical descriptors */
1374                 if ((desc->fip_dtype < 32) &&
1375                     (desc->fip_dtype != FIP_DT_VN_ID) &&
1376                     !(desc_mask & 1U << desc->fip_dtype)) {
1377                         LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
1378                                         "Descriptors in FIP CVL\n");
1379                         goto err;
1380                 }
1381                 switch (desc->fip_dtype) {
1382                 case FIP_DT_MAC:
1383                         mp = (struct fip_mac_desc *)desc;
1384                         if (dlen < sizeof(*mp))
1385                                 goto err;
1386                         if (!ether_addr_equal(mp->fd_mac, fcf->fcf_mac))
1387                                 goto err;
1388                         desc_mask &= ~BIT(FIP_DT_MAC);
1389                         break;
1390                 case FIP_DT_NAME:
1391                         wp = (struct fip_wwn_desc *)desc;
1392                         if (dlen < sizeof(*wp))
1393                                 goto err;
1394                         if (get_unaligned_be64(&wp->fd_wwn) != fcf->switch_name)
1395                                 goto err;
1396                         desc_mask &= ~BIT(FIP_DT_NAME);
1397                         break;
1398                 case FIP_DT_VN_ID:
1399                         vp = (struct fip_vn_desc *)desc;
1400                         if (dlen < sizeof(*vp))
1401                                 goto err;
1402                         vlink_desc_arr[num_vlink_desc++] = vp;
1403                         vn_port = fc_vport_id_lookup(lport,
1404                                                       ntoh24(vp->fd_fc_id));
1405                         if (vn_port && (vn_port == lport)) {
1406                                 mutex_lock(&fip->ctlr_mutex);
1407                                 per_cpu_ptr(lport->stats,
1408                                             get_cpu())->VLinkFailureCount++;
1409                                 put_cpu();
1410                                 fcoe_ctlr_reset(fip);
1411                                 mutex_unlock(&fip->ctlr_mutex);
1412                         }
1413                         break;
1414                 default:
1415                         /* standard says ignore unknown descriptors >= 128 */
1416                         if (desc->fip_dtype < FIP_DT_NON_CRITICAL)
1417                                 goto err;
1418                         break;
1419                 }
1420                 desc = (struct fip_desc *)((char *)desc + dlen);
1421                 rlen -= dlen;
1422         }
1423
1424         /*
1425          * reset only if all required descriptors were present and valid.
1426          */
1427         if (desc_mask)
1428                 LIBFCOE_FIP_DBG(fip, "missing descriptors mask %x\n",
1429                                 desc_mask);
1430         else if (!num_vlink_desc) {
1431                 LIBFCOE_FIP_DBG(fip, "CVL: no Vx_Port descriptor found\n");
1432                 /*
1433                  * No Vx_Port description. Clear all NPIV ports,
1434                  * followed by physical port
1435                  */
1436                 mutex_lock(&fip->ctlr_mutex);
1437                 per_cpu_ptr(lport->stats, get_cpu())->VLinkFailureCount++;
1438                 put_cpu();
1439                 fcoe_ctlr_reset(fip);
1440                 mutex_unlock(&fip->ctlr_mutex);
1441
1442                 mutex_lock(&lport->lp_mutex);
1443                 list_for_each_entry(vn_port, &lport->vports, list)
1444                         fc_lport_reset(vn_port);
1445                 mutex_unlock(&lport->lp_mutex);
1446
1447                 fc_lport_reset(fip->lp);
1448                 fcoe_ctlr_solicit(fip, NULL);
1449         } else {
1450                 int i;
1451
1452                 LIBFCOE_FIP_DBG(fip, "performing Clear Virtual Link\n");
1453                 for (i = 0; i < num_vlink_desc; i++) {
1454                         vp = vlink_desc_arr[i];
1455                         vn_port = fc_vport_id_lookup(lport,
1456                                                      ntoh24(vp->fd_fc_id));
1457                         if (!vn_port)
1458                                 continue;
1459
1460                         /*
1461                          * 'port_id' is already validated, check MAC address and
1462                          * wwpn
1463                          */
1464                         if (!ether_addr_equal(fip->get_src_addr(vn_port),
1465                                               vp->fd_mac) ||
1466                                 get_unaligned_be64(&vp->fd_wwpn) !=
1467                                                         vn_port->wwpn)
1468                                 continue;
1469
1470                         if (vn_port == lport)
1471                                 /*
1472                                  * Physical port, defer processing till all
1473                                  * listed NPIV ports are cleared
1474                                  */
1475                                 reset_phys_port = 1;
1476                         else    /* NPIV port */
1477                                 fc_lport_reset(vn_port);
1478                 }
1479
1480                 if (reset_phys_port) {
1481                         fc_lport_reset(fip->lp);
1482                         fcoe_ctlr_solicit(fip, NULL);
1483                 }
1484         }
1485
1486 err:
1487         kfree(vlink_desc_arr);
1488 }
1489
1490 /**
1491  * fcoe_ctlr_recv() - Receive a FIP packet
1492  * @fip: The FCoE controller that received the packet
1493  * @skb: The received FIP packet
1494  *
1495  * This may be called from either NET_RX_SOFTIRQ or IRQ.
1496  */
1497 void fcoe_ctlr_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
1498 {
1499         skb = skb_share_check(skb, GFP_ATOMIC);
1500         if (!skb)
1501                 return;
1502         skb_queue_tail(&fip->fip_recv_list, skb);
1503         schedule_work(&fip->recv_work);
1504 }
1505 EXPORT_SYMBOL(fcoe_ctlr_recv);
1506
1507 /**
1508  * fcoe_ctlr_recv_handler() - Receive a FIP frame
1509  * @fip: The FCoE controller that received the frame
1510  * @skb: The received FIP frame
1511  *
1512  * Returns non-zero if the frame is dropped.
1513  */
1514 static int fcoe_ctlr_recv_handler(struct fcoe_ctlr *fip, struct sk_buff *skb)
1515 {
1516         struct fip_header *fiph;
1517         struct ethhdr *eh;
1518         enum fip_state state;
1519         bool fip_vlan_resp = false;
1520         u16 op;
1521         u8 sub;
1522
1523         if (skb_linearize(skb))
1524                 goto drop;
1525         if (skb->len < sizeof(*fiph))
1526                 goto drop;
1527         eh = eth_hdr(skb);
1528         if (fip->mode == FIP_MODE_VN2VN) {
1529                 if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1530                     !ether_addr_equal(eh->h_dest, fcoe_all_vn2vn) &&
1531                     !ether_addr_equal(eh->h_dest, fcoe_all_p2p))
1532                         goto drop;
1533         } else if (!ether_addr_equal(eh->h_dest, fip->ctl_src_addr) &&
1534                    !ether_addr_equal(eh->h_dest, fcoe_all_enode))
1535                 goto drop;
1536         fiph = (struct fip_header *)skb->data;
1537         op = ntohs(fiph->fip_op);
1538         sub = fiph->fip_subcode;
1539
1540         if (FIP_VER_DECAPS(fiph->fip_ver) != FIP_VER)
1541                 goto drop;
1542         if (ntohs(fiph->fip_dl_len) * FIP_BPW + sizeof(*fiph) > skb->len)
1543                 goto drop;
1544
1545         mutex_lock(&fip->ctlr_mutex);
1546         state = fip->state;
1547         if (state == FIP_ST_AUTO) {
1548                 fip->map_dest = 0;
1549                 fcoe_ctlr_set_state(fip, FIP_ST_ENABLED);
1550                 state = FIP_ST_ENABLED;
1551                 LIBFCOE_FIP_DBG(fip, "Using FIP mode\n");
1552         }
1553         fip_vlan_resp = fip->fip_resp;
1554         mutex_unlock(&fip->ctlr_mutex);
1555
1556         if (fip->mode == FIP_MODE_VN2VN && op == FIP_OP_VN2VN)
1557                 return fcoe_ctlr_vn_recv(fip, skb);
1558
1559         if (fip_vlan_resp && op == FIP_OP_VLAN) {
1560                 LIBFCOE_FIP_DBG(fip, "fip vlan discovery\n");
1561                 return fcoe_ctlr_vlan_recv(fip, skb);
1562         }
1563
1564         if (state != FIP_ST_ENABLED && state != FIP_ST_VNMP_UP &&
1565             state != FIP_ST_VNMP_CLAIM)
1566                 goto drop;
1567
1568         if (op == FIP_OP_LS) {
1569                 fcoe_ctlr_recv_els(fip, skb);   /* consumes skb */
1570                 return 0;
1571         }
1572
1573         if (state != FIP_ST_ENABLED)
1574                 goto drop;
1575
1576         if (op == FIP_OP_DISC && sub == FIP_SC_ADV)
1577                 fcoe_ctlr_recv_adv(fip, skb);
1578         else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK)
1579                 fcoe_ctlr_recv_clr_vlink(fip, fiph);
1580         kfree_skb(skb);
1581         return 0;
1582 drop:
1583         kfree_skb(skb);
1584         return -1;
1585 }
1586
1587 /**
1588  * fcoe_ctlr_select() - Select the best FCF (if possible)
1589  * @fip: The FCoE controller
1590  *
1591  * Returns the selected FCF, or NULL if none are usable.
1592  *
1593  * If there are conflicting advertisements, no FCF can be chosen.
1594  *
1595  * If there is already a selected FCF, this will choose a better one or
1596  * an equivalent one that hasn't already been sent a FLOGI.
1597  *
1598  * Called with lock held.
1599  */
1600 static struct fcoe_fcf *fcoe_ctlr_select(struct fcoe_ctlr *fip)
1601 {
1602         struct fcoe_fcf *fcf;
1603         struct fcoe_fcf *best = fip->sel_fcf;
1604
1605         list_for_each_entry(fcf, &fip->fcfs, list) {
1606                 LIBFCOE_FIP_DBG(fip, "consider FCF fab %16.16llx "
1607                                 "VFID %d mac %pM map %x val %d "
1608                                 "sent %u pri %u\n",
1609                                 fcf->fabric_name, fcf->vfid, fcf->fcf_mac,
1610                                 fcf->fc_map, fcoe_ctlr_mtu_valid(fcf),
1611                                 fcf->flogi_sent, fcf->pri);
1612                 if (!fcoe_ctlr_fcf_usable(fcf)) {
1613                         LIBFCOE_FIP_DBG(fip, "FCF for fab %16.16llx "
1614                                         "map %x %svalid %savailable\n",
1615                                         fcf->fabric_name, fcf->fc_map,
1616                                         (fcf->flags & FIP_FL_SOL) ? "" : "in",
1617                                         (fcf->flags & FIP_FL_AVAIL) ?
1618                                         "" : "un");
1619                         continue;
1620                 }
1621                 if (!best || fcf->pri < best->pri || best->flogi_sent)
1622                         best = fcf;
1623                 if (fcf->fabric_name != best->fabric_name ||
1624                     fcf->vfid != best->vfid ||
1625                     fcf->fc_map != best->fc_map) {
1626                         LIBFCOE_FIP_DBG(fip, "Conflicting fabric, VFID, "
1627                                         "or FC-MAP\n");
1628                         return NULL;
1629                 }
1630         }
1631         fip->sel_fcf = best;
1632         if (best) {
1633                 LIBFCOE_FIP_DBG(fip, "using FCF mac %pM\n", best->fcf_mac);
1634                 fip->port_ka_time = jiffies +
1635                         msecs_to_jiffies(FIP_VN_KA_PERIOD);
1636                 fip->ctlr_ka_time = jiffies + best->fka_period;
1637                 if (time_before(fip->ctlr_ka_time, fip->timer.expires))
1638                         mod_timer(&fip->timer, fip->ctlr_ka_time);
1639         }
1640         return best;
1641 }
1642
1643 /**
1644  * fcoe_ctlr_flogi_send_locked() - send FIP-encapsulated FLOGI to current FCF
1645  * @fip: The FCoE controller
1646  *
1647  * Returns non-zero error if it could not be sent.
1648  *
1649  * Called with ctlr_mutex and ctlr_lock held.
1650  * Caller must verify that fip->sel_fcf is not NULL.
1651  */
1652 static int fcoe_ctlr_flogi_send_locked(struct fcoe_ctlr *fip)
1653 {
1654         struct sk_buff *skb;
1655         struct sk_buff *skb_orig;
1656         struct fc_frame_header *fh;
1657         int error;
1658
1659         skb_orig = fip->flogi_req;
1660         if (!skb_orig)
1661                 return -EINVAL;
1662
1663         /*
1664          * Clone and send the FLOGI request.  If clone fails, use original.
1665          */
1666         skb = skb_clone(skb_orig, GFP_ATOMIC);
1667         if (!skb) {
1668                 skb = skb_orig;
1669                 fip->flogi_req = NULL;
1670         }
1671         fh = (struct fc_frame_header *)skb->data;
1672         error = fcoe_ctlr_encaps(fip, fip->lp, FIP_DT_FLOGI, skb,
1673                                  ntoh24(fh->fh_d_id));
1674         if (error) {
1675                 kfree_skb(skb);
1676                 return error;
1677         }
1678         fip->send(fip, skb);
1679         fip->sel_fcf->flogi_sent = 1;
1680         return 0;
1681 }
1682
1683 /**
1684  * fcoe_ctlr_flogi_retry() - resend FLOGI request to a new FCF if possible
1685  * @fip: The FCoE controller
1686  *
1687  * Returns non-zero error code if there's no FLOGI request to retry or
1688  * no alternate FCF available.
1689  */
1690 static int fcoe_ctlr_flogi_retry(struct fcoe_ctlr *fip)
1691 {
1692         struct fcoe_fcf *fcf;
1693         int error;
1694
1695         mutex_lock(&fip->ctlr_mutex);
1696         spin_lock_bh(&fip->ctlr_lock);
1697         LIBFCOE_FIP_DBG(fip, "re-sending FLOGI - reselect\n");
1698         fcf = fcoe_ctlr_select(fip);
1699         if (!fcf || fcf->flogi_sent) {
1700                 kfree_skb(fip->flogi_req);
1701                 fip->flogi_req = NULL;
1702                 error = -ENOENT;
1703         } else {
1704                 fcoe_ctlr_solicit(fip, NULL);
1705                 error = fcoe_ctlr_flogi_send_locked(fip);
1706         }
1707         spin_unlock_bh(&fip->ctlr_lock);
1708         mutex_unlock(&fip->ctlr_mutex);
1709         return error;
1710 }
1711
1712
1713 /**
1714  * fcoe_ctlr_flogi_send() - Handle sending of FIP FLOGI.
1715  * @fip: The FCoE controller that timed out
1716  *
1717  * Done here because fcoe_ctlr_els_send() can't get mutex.
1718  *
1719  * Called with ctlr_mutex held.  The caller must not hold ctlr_lock.
1720  */
1721 static void fcoe_ctlr_flogi_send(struct fcoe_ctlr *fip)
1722 {
1723         struct fcoe_fcf *fcf;
1724
1725         spin_lock_bh(&fip->ctlr_lock);
1726         fcf = fip->sel_fcf;
1727         if (!fcf || !fip->flogi_req_send)
1728                 goto unlock;
1729
1730         LIBFCOE_FIP_DBG(fip, "sending FLOGI\n");
1731
1732         /*
1733          * If this FLOGI is being sent due to a timeout retry
1734          * to the same FCF as before, select a different FCF if possible.
1735          */
1736         if (fcf->flogi_sent) {
1737                 LIBFCOE_FIP_DBG(fip, "sending FLOGI - reselect\n");
1738                 fcf = fcoe_ctlr_select(fip);
1739                 if (!fcf || fcf->flogi_sent) {
1740                         LIBFCOE_FIP_DBG(fip, "sending FLOGI - clearing\n");
1741                         list_for_each_entry(fcf, &fip->fcfs, list)
1742                                 fcf->flogi_sent = 0;
1743                         fcf = fcoe_ctlr_select(fip);
1744                 }
1745         }
1746         if (fcf) {
1747                 fcoe_ctlr_flogi_send_locked(fip);
1748                 fip->flogi_req_send = 0;
1749         } else /* XXX */
1750                 LIBFCOE_FIP_DBG(fip, "No FCF selected - defer send\n");
1751 unlock:
1752         spin_unlock_bh(&fip->ctlr_lock);
1753 }
1754
1755 /**
1756  * fcoe_ctlr_timeout() - FIP timeout handler
1757  * @arg: The FCoE controller that timed out
1758  */
1759 static void fcoe_ctlr_timeout(unsigned long arg)
1760 {
1761         struct fcoe_ctlr *fip = (struct fcoe_ctlr *)arg;
1762
1763         schedule_work(&fip->timer_work);
1764 }
1765
1766 /**
1767  * fcoe_ctlr_timer_work() - Worker thread function for timer work
1768  * @work: Handle to a FCoE controller
1769  *
1770  * Ages FCFs.  Triggers FCF selection if possible.
1771  * Sends keep-alives and resets.
1772  */
1773 static void fcoe_ctlr_timer_work(struct work_struct *work)
1774 {
1775         struct fcoe_ctlr *fip;
1776         struct fc_lport *vport;
1777         u8 *mac;
1778         u8 reset = 0;
1779         u8 send_ctlr_ka = 0;
1780         u8 send_port_ka = 0;
1781         struct fcoe_fcf *sel;
1782         struct fcoe_fcf *fcf;
1783         unsigned long next_timer;
1784
1785         fip = container_of(work, struct fcoe_ctlr, timer_work);
1786         if (fip->mode == FIP_MODE_VN2VN)
1787                 return fcoe_ctlr_vn_timeout(fip);
1788         mutex_lock(&fip->ctlr_mutex);
1789         if (fip->state == FIP_ST_DISABLED) {
1790                 mutex_unlock(&fip->ctlr_mutex);
1791                 return;
1792         }
1793
1794         fcf = fip->sel_fcf;
1795         next_timer = fcoe_ctlr_age_fcfs(fip);
1796
1797         sel = fip->sel_fcf;
1798         if (!sel && fip->sel_time) {
1799                 if (time_after_eq(jiffies, fip->sel_time)) {
1800                         sel = fcoe_ctlr_select(fip);
1801                         fip->sel_time = 0;
1802                 } else if (time_after(next_timer, fip->sel_time))
1803                         next_timer = fip->sel_time;
1804         }
1805
1806         if (sel && fip->flogi_req_send)
1807                 fcoe_ctlr_flogi_send(fip);
1808         else if (!sel && fcf)
1809                 reset = 1;
1810
1811         if (sel && !sel->fd_flags) {
1812                 if (time_after_eq(jiffies, fip->ctlr_ka_time)) {
1813                         fip->ctlr_ka_time = jiffies + sel->fka_period;
1814                         send_ctlr_ka = 1;
1815                 }
1816                 if (time_after(next_timer, fip->ctlr_ka_time))
1817                         next_timer = fip->ctlr_ka_time;
1818
1819                 if (time_after_eq(jiffies, fip->port_ka_time)) {
1820                         fip->port_ka_time = jiffies +
1821                                 msecs_to_jiffies(FIP_VN_KA_PERIOD);
1822                         send_port_ka = 1;
1823                 }
1824                 if (time_after(next_timer, fip->port_ka_time))
1825                         next_timer = fip->port_ka_time;
1826         }
1827         if (!list_empty(&fip->fcfs))
1828                 mod_timer(&fip->timer, next_timer);
1829         mutex_unlock(&fip->ctlr_mutex);
1830
1831         if (reset) {
1832                 fc_lport_reset(fip->lp);
1833                 /* restart things with a solicitation */
1834                 fcoe_ctlr_solicit(fip, NULL);
1835         }
1836
1837         if (send_ctlr_ka)
1838                 fcoe_ctlr_send_keep_alive(fip, NULL, 0, fip->ctl_src_addr);
1839
1840         if (send_port_ka) {
1841                 mutex_lock(&fip->lp->lp_mutex);
1842                 mac = fip->get_src_addr(fip->lp);
1843                 fcoe_ctlr_send_keep_alive(fip, fip->lp, 1, mac);
1844                 list_for_each_entry(vport, &fip->lp->vports, list) {
1845                         mac = fip->get_src_addr(vport);
1846                         fcoe_ctlr_send_keep_alive(fip, vport, 1, mac);
1847                 }
1848                 mutex_unlock(&fip->lp->lp_mutex);
1849         }
1850 }
1851
1852 /**
1853  * fcoe_ctlr_recv_work() - Worker thread function for receiving FIP frames
1854  * @recv_work: Handle to a FCoE controller
1855  */
1856 static void fcoe_ctlr_recv_work(struct work_struct *recv_work)
1857 {
1858         struct fcoe_ctlr *fip;
1859         struct sk_buff *skb;
1860
1861         fip = container_of(recv_work, struct fcoe_ctlr, recv_work);
1862         while ((skb = skb_dequeue(&fip->fip_recv_list)))
1863                 fcoe_ctlr_recv_handler(fip, skb);
1864 }
1865
1866 /**
1867  * fcoe_ctlr_recv_flogi() - Snoop pre-FIP receipt of FLOGI response
1868  * @fip: The FCoE controller
1869  * @fp:  The FC frame to snoop
1870  *
1871  * Snoop potential response to FLOGI or even incoming FLOGI.
1872  *
1873  * The caller has checked that we are waiting for login as indicated
1874  * by fip->flogi_oxid != FC_XID_UNKNOWN.
1875  *
1876  * The caller is responsible for freeing the frame.
1877  * Fill in the granted_mac address.
1878  *
1879  * Return non-zero if the frame should not be delivered to libfc.
1880  */
1881 int fcoe_ctlr_recv_flogi(struct fcoe_ctlr *fip, struct fc_lport *lport,
1882                          struct fc_frame *fp)
1883 {
1884         struct fc_frame_header *fh;
1885         u8 op;
1886         u8 *sa;
1887
1888         sa = eth_hdr(&fp->skb)->h_source;
1889         fh = fc_frame_header_get(fp);
1890         if (fh->fh_type != FC_TYPE_ELS)
1891                 return 0;
1892
1893         op = fc_frame_payload_op(fp);
1894         if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
1895             fip->flogi_oxid == ntohs(fh->fh_ox_id)) {
1896
1897                 mutex_lock(&fip->ctlr_mutex);
1898                 if (fip->state != FIP_ST_AUTO && fip->state != FIP_ST_NON_FIP) {
1899                         mutex_unlock(&fip->ctlr_mutex);
1900                         return -EINVAL;
1901                 }
1902                 fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1903                 LIBFCOE_FIP_DBG(fip,
1904                                 "received FLOGI LS_ACC using non-FIP mode\n");
1905
1906                 /*
1907                  * FLOGI accepted.
1908                  * If the src mac addr is FC_OUI-based, then we mark the
1909                  * address_mode flag to use FC_OUI-based Ethernet DA.
1910                  * Otherwise we use the FCoE gateway addr
1911                  */
1912                 if (ether_addr_equal(sa, (u8[6])FC_FCOE_FLOGI_MAC)) {
1913                         fcoe_ctlr_map_dest(fip);
1914                 } else {
1915                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1916                         fip->map_dest = 0;
1917                 }
1918                 fip->flogi_oxid = FC_XID_UNKNOWN;
1919                 mutex_unlock(&fip->ctlr_mutex);
1920                 fc_fcoe_set_mac(fr_cb(fp)->granted_mac, fh->fh_d_id);
1921         } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
1922                 /*
1923                  * Save source MAC for point-to-point responses.
1924                  */
1925                 mutex_lock(&fip->ctlr_mutex);
1926                 if (fip->state == FIP_ST_AUTO || fip->state == FIP_ST_NON_FIP) {
1927                         memcpy(fip->dest_addr, sa, ETH_ALEN);
1928                         fip->map_dest = 0;
1929                         if (fip->state == FIP_ST_AUTO)
1930                                 LIBFCOE_FIP_DBG(fip, "received non-FIP FLOGI. "
1931                                                 "Setting non-FIP mode\n");
1932                         fcoe_ctlr_set_state(fip, FIP_ST_NON_FIP);
1933                 }
1934                 mutex_unlock(&fip->ctlr_mutex);
1935         }
1936         return 0;
1937 }
1938 EXPORT_SYMBOL(fcoe_ctlr_recv_flogi);
1939
1940 /**
1941  * fcoe_wwn_from_mac() - Converts a 48-bit IEEE MAC address to a 64-bit FC WWN
1942  * @mac:    The MAC address to convert
1943  * @scheme: The scheme to use when converting
1944  * @port:   The port indicator for converting
1945  *
1946  * Returns: u64 fc world wide name
1947  */
1948 u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
1949                       unsigned int scheme, unsigned int port)
1950 {
1951         u64 wwn;
1952         u64 host_mac;
1953
1954         /* The MAC is in NO, so flip only the low 48 bits */
1955         host_mac = ((u64) mac[0] << 40) |
1956                 ((u64) mac[1] << 32) |
1957                 ((u64) mac[2] << 24) |
1958                 ((u64) mac[3] << 16) |
1959                 ((u64) mac[4] << 8) |
1960                 (u64) mac[5];
1961
1962         WARN_ON(host_mac >= (1ULL << 48));
1963         wwn = host_mac | ((u64) scheme << 60);
1964         switch (scheme) {
1965         case 1:
1966                 WARN_ON(port != 0);
1967                 break;
1968         case 2:
1969                 WARN_ON(port >= 0xfff);
1970                 wwn |= (u64) port << 48;
1971                 break;
1972         default:
1973                 WARN_ON(1);
1974                 break;
1975         }
1976
1977         return wwn;
1978 }
1979 EXPORT_SYMBOL_GPL(fcoe_wwn_from_mac);
1980
1981 /**
1982  * fcoe_ctlr_rport() - return the fcoe_rport for a given fc_rport_priv
1983  * @rdata: libfc remote port
1984  */
1985 static inline struct fcoe_rport *fcoe_ctlr_rport(struct fc_rport_priv *rdata)
1986 {
1987         return (struct fcoe_rport *)(rdata + 1);
1988 }
1989
1990 /**
1991  * fcoe_ctlr_vn_send() - Send a FIP VN2VN Probe Request or Reply.
1992  * @fip: The FCoE controller
1993  * @sub: sub-opcode for probe request, reply, or advertisement.
1994  * @dest: The destination Ethernet MAC address
1995  * @min_len: minimum size of the Ethernet payload to be sent
1996  */
1997 static void fcoe_ctlr_vn_send(struct fcoe_ctlr *fip,
1998                               enum fip_vn2vn_subcode sub,
1999                               const u8 *dest, size_t min_len)
2000 {
2001         struct sk_buff *skb;
2002         struct fip_vn2vn_probe_frame {
2003                 struct ethhdr eth;
2004                 struct fip_header fip;
2005                 struct fip_mac_desc mac;
2006                 struct fip_wwn_desc wwnn;
2007                 struct fip_vn_desc vn;
2008         } __packed * frame;
2009         struct fip_fc4_feat *ff;
2010         struct fip_size_desc *size;
2011         u32 fcp_feat;
2012         size_t len;
2013         size_t dlen;
2014
2015         len = sizeof(*frame);
2016         dlen = 0;
2017         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2018                 dlen = sizeof(struct fip_fc4_feat) +
2019                        sizeof(struct fip_size_desc);
2020                 len += dlen;
2021         }
2022         dlen += sizeof(frame->mac) + sizeof(frame->wwnn) + sizeof(frame->vn);
2023         len = max(len, min_len + sizeof(struct ethhdr));
2024
2025         skb = dev_alloc_skb(len);
2026         if (!skb)
2027                 return;
2028
2029         frame = (struct fip_vn2vn_probe_frame *)skb->data;
2030         memset(frame, 0, len);
2031         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
2032
2033         if (sub == FIP_SC_VN_BEACON) {
2034                 hton24(frame->eth.h_source, FIP_VN_FC_MAP);
2035                 hton24(frame->eth.h_source + 3, fip->port_id);
2036         } else {
2037                 memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
2038         }
2039         frame->eth.h_proto = htons(ETH_P_FIP);
2040
2041         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
2042         frame->fip.fip_op = htons(FIP_OP_VN2VN);
2043         frame->fip.fip_subcode = sub;
2044         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
2045
2046         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
2047         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2048         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2049
2050         frame->wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
2051         frame->wwnn.fd_desc.fip_dlen = sizeof(frame->wwnn) / FIP_BPW;
2052         put_unaligned_be64(fip->lp->wwnn, &frame->wwnn.fd_wwn);
2053
2054         frame->vn.fd_desc.fip_dtype = FIP_DT_VN_ID;
2055         frame->vn.fd_desc.fip_dlen = sizeof(frame->vn) / FIP_BPW;
2056         hton24(frame->vn.fd_mac, FIP_VN_FC_MAP);
2057         hton24(frame->vn.fd_mac + 3, fip->port_id);
2058         hton24(frame->vn.fd_fc_id, fip->port_id);
2059         put_unaligned_be64(fip->lp->wwpn, &frame->vn.fd_wwpn);
2060
2061         /*
2062          * For claims, add FC-4 features.
2063          * TBD: Add interface to get fc-4 types and features from libfc.
2064          */
2065         if (sub == FIP_SC_VN_CLAIM_NOTIFY || sub == FIP_SC_VN_CLAIM_REP) {
2066                 ff = (struct fip_fc4_feat *)(frame + 1);
2067                 ff->fd_desc.fip_dtype = FIP_DT_FC4F;
2068                 ff->fd_desc.fip_dlen = sizeof(*ff) / FIP_BPW;
2069                 ff->fd_fts = fip->lp->fcts;
2070
2071                 fcp_feat = 0;
2072                 if (fip->lp->service_params & FCP_SPPF_INIT_FCN)
2073                         fcp_feat |= FCP_FEAT_INIT;
2074                 if (fip->lp->service_params & FCP_SPPF_TARG_FCN)
2075                         fcp_feat |= FCP_FEAT_TARG;
2076                 fcp_feat <<= (FC_TYPE_FCP * 4) % 32;
2077                 ff->fd_ff.fd_feat[FC_TYPE_FCP * 4 / 32] = htonl(fcp_feat);
2078
2079                 size = (struct fip_size_desc *)(ff + 1);
2080                 size->fd_desc.fip_dtype = FIP_DT_FCOE_SIZE;
2081                 size->fd_desc.fip_dlen = sizeof(*size) / FIP_BPW;
2082                 size->fd_size = htons(fcoe_ctlr_fcoe_size(fip));
2083         }
2084
2085         skb_put(skb, len);
2086         skb->protocol = htons(ETH_P_FIP);
2087         skb->priority = fip->priority;
2088         skb_reset_mac_header(skb);
2089         skb_reset_network_header(skb);
2090
2091         fip->send(fip, skb);
2092 }
2093
2094 /**
2095  * fcoe_ctlr_vn_rport_callback - Event handler for rport events.
2096  * @lport: The lport which is receiving the event
2097  * @rdata: remote port private data
2098  * @event: The event that occurred
2099  *
2100  * Locking Note:  The rport lock must not be held when calling this function.
2101  */
2102 static void fcoe_ctlr_vn_rport_callback(struct fc_lport *lport,
2103                                         struct fc_rport_priv *rdata,
2104                                         enum fc_rport_event event)
2105 {
2106         struct fcoe_ctlr *fip = lport->disc.priv;
2107         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2108
2109         LIBFCOE_FIP_DBG(fip, "vn_rport_callback %x event %d\n",
2110                         rdata->ids.port_id, event);
2111
2112         mutex_lock(&fip->ctlr_mutex);
2113         switch (event) {
2114         case RPORT_EV_READY:
2115                 frport->login_count = 0;
2116                 break;
2117         case RPORT_EV_LOGO:
2118         case RPORT_EV_FAILED:
2119         case RPORT_EV_STOP:
2120                 frport->login_count++;
2121                 if (frport->login_count > FCOE_CTLR_VN2VN_LOGIN_LIMIT) {
2122                         LIBFCOE_FIP_DBG(fip,
2123                                         "rport FLOGI limited port_id %6.6x\n",
2124                                         rdata->ids.port_id);
2125                         lport->tt.rport_logoff(rdata);
2126                 }
2127                 break;
2128         default:
2129                 break;
2130         }
2131         mutex_unlock(&fip->ctlr_mutex);
2132 }
2133
2134 static struct fc_rport_operations fcoe_ctlr_vn_rport_ops = {
2135         .event_callback = fcoe_ctlr_vn_rport_callback,
2136 };
2137
2138 /**
2139  * fcoe_ctlr_disc_stop_locked() - stop discovery in VN2VN mode
2140  * @fip: The FCoE controller
2141  *
2142  * Called with ctlr_mutex held.
2143  */
2144 static void fcoe_ctlr_disc_stop_locked(struct fc_lport *lport)
2145 {
2146         struct fc_rport_priv *rdata;
2147
2148         mutex_lock(&lport->disc.disc_mutex);
2149         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers)
2150                 lport->tt.rport_logoff(rdata);
2151         lport->disc.disc_callback = NULL;
2152         mutex_unlock(&lport->disc.disc_mutex);
2153 }
2154
2155 /**
2156  * fcoe_ctlr_disc_stop() - stop discovery in VN2VN mode
2157  * @fip: The FCoE controller
2158  *
2159  * Called through the local port template for discovery.
2160  * Called without the ctlr_mutex held.
2161  */
2162 static void fcoe_ctlr_disc_stop(struct fc_lport *lport)
2163 {
2164         struct fcoe_ctlr *fip = lport->disc.priv;
2165
2166         mutex_lock(&fip->ctlr_mutex);
2167         fcoe_ctlr_disc_stop_locked(lport);
2168         mutex_unlock(&fip->ctlr_mutex);
2169 }
2170
2171 /**
2172  * fcoe_ctlr_disc_stop_final() - stop discovery for shutdown in VN2VN mode
2173  * @fip: The FCoE controller
2174  *
2175  * Called through the local port template for discovery.
2176  * Called without the ctlr_mutex held.
2177  */
2178 static void fcoe_ctlr_disc_stop_final(struct fc_lport *lport)
2179 {
2180         fcoe_ctlr_disc_stop(lport);
2181         lport->tt.rport_flush_queue();
2182         synchronize_rcu();
2183 }
2184
2185 /**
2186  * fcoe_ctlr_vn_restart() - VN2VN probe restart with new port_id
2187  * @fip: The FCoE controller
2188  *
2189  * Called with fcoe_ctlr lock held.
2190  */
2191 static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
2192 {
2193         unsigned long wait;
2194         u32 port_id;
2195
2196         fcoe_ctlr_disc_stop_locked(fip->lp);
2197
2198         /*
2199          * Get proposed port ID.
2200          * If this is the first try after link up, use any previous port_id.
2201          * If there was none, use the low bits of the port_name.
2202          * On subsequent tries, get the next random one.
2203          * Don't use reserved IDs, use another non-zero value, just as random.
2204          */
2205         port_id = fip->port_id;
2206         if (fip->probe_tries)
2207                 port_id = prandom_u32_state(&fip->rnd_state) & 0xffff;
2208         else if (!port_id)
2209                 port_id = fip->lp->wwpn & 0xffff;
2210         if (!port_id || port_id == 0xffff)
2211                 port_id = 1;
2212         fip->port_id = port_id;
2213
2214         if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
2215                 fip->probe_tries++;
2216                 wait = prandom_u32() % FIP_VN_PROBE_WAIT;
2217         } else
2218                 wait = FIP_VN_RLIM_INT;
2219         mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
2220         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_START);
2221 }
2222
2223 /**
2224  * fcoe_ctlr_vn_start() - Start in VN2VN mode
2225  * @fip: The FCoE controller
2226  *
2227  * Called with fcoe_ctlr lock held.
2228  */
2229 static void fcoe_ctlr_vn_start(struct fcoe_ctlr *fip)
2230 {
2231         fip->probe_tries = 0;
2232         prandom_seed_state(&fip->rnd_state, fip->lp->wwpn);
2233         fcoe_ctlr_vn_restart(fip);
2234 }
2235
2236 /**
2237  * fcoe_ctlr_vn_parse - parse probe request or response
2238  * @fip: The FCoE controller
2239  * @skb: incoming packet
2240  * @rdata: buffer for resulting parsed VN entry plus fcoe_rport
2241  *
2242  * Returns non-zero error number on error.
2243  * Does not consume the packet.
2244  */
2245 static int fcoe_ctlr_vn_parse(struct fcoe_ctlr *fip,
2246                               struct sk_buff *skb,
2247                               struct fc_rport_priv *rdata)
2248 {
2249         struct fip_header *fiph;
2250         struct fip_desc *desc = NULL;
2251         struct fip_mac_desc *macd = NULL;
2252         struct fip_wwn_desc *wwn = NULL;
2253         struct fip_vn_desc *vn = NULL;
2254         struct fip_size_desc *size = NULL;
2255         struct fcoe_rport *frport;
2256         size_t rlen;
2257         size_t dlen;
2258         u32 desc_mask = 0;
2259         u32 dtype;
2260         u8 sub;
2261
2262         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2263         frport = fcoe_ctlr_rport(rdata);
2264
2265         fiph = (struct fip_header *)skb->data;
2266         frport->flags = ntohs(fiph->fip_flags);
2267
2268         sub = fiph->fip_subcode;
2269         switch (sub) {
2270         case FIP_SC_VN_PROBE_REQ:
2271         case FIP_SC_VN_PROBE_REP:
2272         case FIP_SC_VN_BEACON:
2273                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2274                             BIT(FIP_DT_VN_ID);
2275                 break;
2276         case FIP_SC_VN_CLAIM_NOTIFY:
2277         case FIP_SC_VN_CLAIM_REP:
2278                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME) |
2279                             BIT(FIP_DT_VN_ID) | BIT(FIP_DT_FC4F) |
2280                             BIT(FIP_DT_FCOE_SIZE);
2281                 break;
2282         default:
2283                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2284                 return -EINVAL;
2285         }
2286
2287         rlen = ntohs(fiph->fip_dl_len) * 4;
2288         if (rlen + sizeof(*fiph) > skb->len)
2289                 return -EINVAL;
2290
2291         desc = (struct fip_desc *)(fiph + 1);
2292         while (rlen > 0) {
2293                 dlen = desc->fip_dlen * FIP_BPW;
2294                 if (dlen < sizeof(*desc) || dlen > rlen)
2295                         return -EINVAL;
2296
2297                 dtype = desc->fip_dtype;
2298                 if (dtype < 32) {
2299                         if (!(desc_mask & BIT(dtype))) {
2300                                 LIBFCOE_FIP_DBG(fip,
2301                                                 "unexpected or duplicated desc "
2302                                                 "desc type %u in "
2303                                                 "FIP VN2VN subtype %u\n",
2304                                                 dtype, sub);
2305                                 return -EINVAL;
2306                         }
2307                         desc_mask &= ~BIT(dtype);
2308                 }
2309
2310                 switch (dtype) {
2311                 case FIP_DT_MAC:
2312                         if (dlen != sizeof(struct fip_mac_desc))
2313                                 goto len_err;
2314                         macd = (struct fip_mac_desc *)desc;
2315                         if (!is_valid_ether_addr(macd->fd_mac)) {
2316                                 LIBFCOE_FIP_DBG(fip,
2317                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2318                                          macd->fd_mac);
2319                                 return -EINVAL;
2320                         }
2321                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2322                         break;
2323                 case FIP_DT_NAME:
2324                         if (dlen != sizeof(struct fip_wwn_desc))
2325                                 goto len_err;
2326                         wwn = (struct fip_wwn_desc *)desc;
2327                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2328                         break;
2329                 case FIP_DT_VN_ID:
2330                         if (dlen != sizeof(struct fip_vn_desc))
2331                                 goto len_err;
2332                         vn = (struct fip_vn_desc *)desc;
2333                         memcpy(frport->vn_mac, vn->fd_mac, ETH_ALEN);
2334                         rdata->ids.port_id = ntoh24(vn->fd_fc_id);
2335                         rdata->ids.port_name = get_unaligned_be64(&vn->fd_wwpn);
2336                         break;
2337                 case FIP_DT_FC4F:
2338                         if (dlen != sizeof(struct fip_fc4_feat))
2339                                 goto len_err;
2340                         break;
2341                 case FIP_DT_FCOE_SIZE:
2342                         if (dlen != sizeof(struct fip_size_desc))
2343                                 goto len_err;
2344                         size = (struct fip_size_desc *)desc;
2345                         frport->fcoe_len = ntohs(size->fd_size);
2346                         break;
2347                 default:
2348                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2349                                         "in FIP probe\n", dtype);
2350                         /* standard says ignore unknown descriptors >= 128 */
2351                         if (dtype < FIP_DT_NON_CRITICAL)
2352                                 return -EINVAL;
2353                         break;
2354                 }
2355                 desc = (struct fip_desc *)((char *)desc + dlen);
2356                 rlen -= dlen;
2357         }
2358         return 0;
2359
2360 len_err:
2361         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2362                         dtype, dlen);
2363         return -EINVAL;
2364 }
2365
2366 /**
2367  * fcoe_ctlr_vn_send_claim() - send multicast FIP VN2VN Claim Notification.
2368  * @fip: The FCoE controller
2369  *
2370  * Called with ctlr_mutex held.
2371  */
2372 static void fcoe_ctlr_vn_send_claim(struct fcoe_ctlr *fip)
2373 {
2374         fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_NOTIFY, fcoe_all_vn2vn, 0);
2375         fip->sol_time = jiffies;
2376 }
2377
2378 /**
2379  * fcoe_ctlr_vn_probe_req() - handle incoming VN2VN probe request.
2380  * @fip: The FCoE controller
2381  * @rdata: parsed remote port with frport from the probe request
2382  *
2383  * Called with ctlr_mutex held.
2384  */
2385 static void fcoe_ctlr_vn_probe_req(struct fcoe_ctlr *fip,
2386                                    struct fc_rport_priv *rdata)
2387 {
2388         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2389
2390         if (rdata->ids.port_id != fip->port_id)
2391                 return;
2392
2393         switch (fip->state) {
2394         case FIP_ST_VNMP_CLAIM:
2395         case FIP_ST_VNMP_UP:
2396                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2397                                   frport->enode_mac, 0);
2398                 break;
2399         case FIP_ST_VNMP_PROBE1:
2400         case FIP_ST_VNMP_PROBE2:
2401                 /*
2402                  * Decide whether to reply to the Probe.
2403                  * Our selected address is never a "recorded" one, so
2404                  * only reply if our WWPN is greater and the
2405                  * Probe's REC bit is not set.
2406                  * If we don't reply, we will change our address.
2407                  */
2408                 if (fip->lp->wwpn > rdata->ids.port_name &&
2409                     !(frport->flags & FIP_FL_REC_OR_P2P)) {
2410                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REP,
2411                                           frport->enode_mac, 0);
2412                         break;
2413                 }
2414                 /* fall through */
2415         case FIP_ST_VNMP_START:
2416                 fcoe_ctlr_vn_restart(fip);
2417                 break;
2418         default:
2419                 break;
2420         }
2421 }
2422
2423 /**
2424  * fcoe_ctlr_vn_probe_reply() - handle incoming VN2VN probe reply.
2425  * @fip: The FCoE controller
2426  * @rdata: parsed remote port with frport from the probe request
2427  *
2428  * Called with ctlr_mutex held.
2429  */
2430 static void fcoe_ctlr_vn_probe_reply(struct fcoe_ctlr *fip,
2431                                    struct fc_rport_priv *rdata)
2432 {
2433         if (rdata->ids.port_id != fip->port_id)
2434                 return;
2435         switch (fip->state) {
2436         case FIP_ST_VNMP_START:
2437         case FIP_ST_VNMP_PROBE1:
2438         case FIP_ST_VNMP_PROBE2:
2439         case FIP_ST_VNMP_CLAIM:
2440                 fcoe_ctlr_vn_restart(fip);
2441                 break;
2442         case FIP_ST_VNMP_UP:
2443                 fcoe_ctlr_vn_send_claim(fip);
2444                 break;
2445         default:
2446                 break;
2447         }
2448 }
2449
2450 /**
2451  * fcoe_ctlr_vn_add() - Add a VN2VN entry to the list, based on a claim reply.
2452  * @fip: The FCoE controller
2453  * @new: newly-parsed remote port with frport as a template for new rdata
2454  *
2455  * Called with ctlr_mutex held.
2456  */
2457 static void fcoe_ctlr_vn_add(struct fcoe_ctlr *fip, struct fc_rport_priv *new)
2458 {
2459         struct fc_lport *lport = fip->lp;
2460         struct fc_rport_priv *rdata;
2461         struct fc_rport_identifiers *ids;
2462         struct fcoe_rport *frport;
2463         u32 port_id;
2464
2465         port_id = new->ids.port_id;
2466         if (port_id == fip->port_id)
2467                 return;
2468
2469         mutex_lock(&lport->disc.disc_mutex);
2470         rdata = lport->tt.rport_create(lport, port_id);
2471         if (!rdata) {
2472                 mutex_unlock(&lport->disc.disc_mutex);
2473                 return;
2474         }
2475
2476         rdata->ops = &fcoe_ctlr_vn_rport_ops;
2477         rdata->disc_id = lport->disc.disc_id;
2478
2479         ids = &rdata->ids;
2480         if ((ids->port_name != -1 && ids->port_name != new->ids.port_name) ||
2481             (ids->node_name != -1 && ids->node_name != new->ids.node_name))
2482                 lport->tt.rport_logoff(rdata);
2483         ids->port_name = new->ids.port_name;
2484         ids->node_name = new->ids.node_name;
2485         mutex_unlock(&lport->disc.disc_mutex);
2486
2487         frport = fcoe_ctlr_rport(rdata);
2488         LIBFCOE_FIP_DBG(fip, "vn_add rport %6.6x %s\n",
2489                         port_id, frport->fcoe_len ? "old" : "new");
2490         *frport = *fcoe_ctlr_rport(new);
2491         frport->time = 0;
2492 }
2493
2494 /**
2495  * fcoe_ctlr_vn_lookup() - Find VN remote port's MAC address
2496  * @fip: The FCoE controller
2497  * @port_id:  The port_id of the remote VN_node
2498  * @mac: buffer which will hold the VN_NODE destination MAC address, if found.
2499  *
2500  * Returns non-zero error if no remote port found.
2501  */
2502 static int fcoe_ctlr_vn_lookup(struct fcoe_ctlr *fip, u32 port_id, u8 *mac)
2503 {
2504         struct fc_lport *lport = fip->lp;
2505         struct fc_rport_priv *rdata;
2506         struct fcoe_rport *frport;
2507         int ret = -1;
2508
2509         rdata = lport->tt.rport_lookup(lport, port_id);
2510         if (rdata) {
2511                 frport = fcoe_ctlr_rport(rdata);
2512                 memcpy(mac, frport->enode_mac, ETH_ALEN);
2513                 ret = 0;
2514                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2515         }
2516         return ret;
2517 }
2518
2519 /**
2520  * fcoe_ctlr_vn_claim_notify() - handle received FIP VN2VN Claim Notification
2521  * @fip: The FCoE controller
2522  * @new: newly-parsed remote port with frport as a template for new rdata
2523  *
2524  * Called with ctlr_mutex held.
2525  */
2526 static void fcoe_ctlr_vn_claim_notify(struct fcoe_ctlr *fip,
2527                                       struct fc_rport_priv *new)
2528 {
2529         struct fcoe_rport *frport = fcoe_ctlr_rport(new);
2530
2531         if (frport->flags & FIP_FL_REC_OR_P2P) {
2532                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2533                 return;
2534         }
2535         switch (fip->state) {
2536         case FIP_ST_VNMP_START:
2537         case FIP_ST_VNMP_PROBE1:
2538         case FIP_ST_VNMP_PROBE2:
2539                 if (new->ids.port_id == fip->port_id)
2540                         fcoe_ctlr_vn_restart(fip);
2541                 break;
2542         case FIP_ST_VNMP_CLAIM:
2543         case FIP_ST_VNMP_UP:
2544                 if (new->ids.port_id == fip->port_id) {
2545                         if (new->ids.port_name > fip->lp->wwpn) {
2546                                 fcoe_ctlr_vn_restart(fip);
2547                                 break;
2548                         }
2549                         fcoe_ctlr_vn_send_claim(fip);
2550                         break;
2551                 }
2552                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_CLAIM_REP, frport->enode_mac,
2553                                   min((u32)frport->fcoe_len,
2554                                       fcoe_ctlr_fcoe_size(fip)));
2555                 fcoe_ctlr_vn_add(fip, new);
2556                 break;
2557         default:
2558                 break;
2559         }
2560 }
2561
2562 /**
2563  * fcoe_ctlr_vn_claim_resp() - handle received Claim Response
2564  * @fip: The FCoE controller that received the frame
2565  * @new: newly-parsed remote port with frport from the Claim Response
2566  *
2567  * Called with ctlr_mutex held.
2568  */
2569 static void fcoe_ctlr_vn_claim_resp(struct fcoe_ctlr *fip,
2570                                     struct fc_rport_priv *new)
2571 {
2572         LIBFCOE_FIP_DBG(fip, "claim resp from from rport %x - state %s\n",
2573                         new->ids.port_id, fcoe_ctlr_state(fip->state));
2574         if (fip->state == FIP_ST_VNMP_UP || fip->state == FIP_ST_VNMP_CLAIM)
2575                 fcoe_ctlr_vn_add(fip, new);
2576 }
2577
2578 /**
2579  * fcoe_ctlr_vn_beacon() - handle received beacon.
2580  * @fip: The FCoE controller that received the frame
2581  * @new: newly-parsed remote port with frport from the Beacon
2582  *
2583  * Called with ctlr_mutex held.
2584  */
2585 static void fcoe_ctlr_vn_beacon(struct fcoe_ctlr *fip,
2586                                 struct fc_rport_priv *new)
2587 {
2588         struct fc_lport *lport = fip->lp;
2589         struct fc_rport_priv *rdata;
2590         struct fcoe_rport *frport;
2591
2592         frport = fcoe_ctlr_rport(new);
2593         if (frport->flags & FIP_FL_REC_OR_P2P) {
2594                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
2595                 return;
2596         }
2597         rdata = lport->tt.rport_lookup(lport, new->ids.port_id);
2598         if (rdata) {
2599                 if (rdata->ids.node_name == new->ids.node_name &&
2600                     rdata->ids.port_name == new->ids.port_name) {
2601                         frport = fcoe_ctlr_rport(rdata);
2602                         if (!frport->time && fip->state == FIP_ST_VNMP_UP)
2603                                 lport->tt.rport_login(rdata);
2604                         frport->time = jiffies;
2605                 }
2606                 kref_put(&rdata->kref, lport->tt.rport_destroy);
2607                 return;
2608         }
2609         if (fip->state != FIP_ST_VNMP_UP)
2610                 return;
2611
2612         /*
2613          * Beacon from a new neighbor.
2614          * Send a claim notify if one hasn't been sent recently.
2615          * Don't add the neighbor yet.
2616          */
2617         LIBFCOE_FIP_DBG(fip, "beacon from new rport %x. sending claim notify\n",
2618                         new->ids.port_id);
2619         if (time_after(jiffies,
2620                        fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT)))
2621                 fcoe_ctlr_vn_send_claim(fip);
2622 }
2623
2624 /**
2625  * fcoe_ctlr_vn_age() - Check for VN_ports without recent beacons
2626  * @fip: The FCoE controller
2627  *
2628  * Called with ctlr_mutex held.
2629  * Called only in state FIP_ST_VNMP_UP.
2630  * Returns the soonest time for next age-out or a time far in the future.
2631  */
2632 static unsigned long fcoe_ctlr_vn_age(struct fcoe_ctlr *fip)
2633 {
2634         struct fc_lport *lport = fip->lp;
2635         struct fc_rport_priv *rdata;
2636         struct fcoe_rport *frport;
2637         unsigned long next_time;
2638         unsigned long deadline;
2639
2640         next_time = jiffies + msecs_to_jiffies(FIP_VN_BEACON_INT * 10);
2641         mutex_lock(&lport->disc.disc_mutex);
2642         list_for_each_entry_rcu(rdata, &lport->disc.rports, peers) {
2643                 frport = fcoe_ctlr_rport(rdata);
2644                 if (!frport->time)
2645                         continue;
2646                 deadline = frport->time +
2647                            msecs_to_jiffies(FIP_VN_BEACON_INT * 25 / 10);
2648                 if (time_after_eq(jiffies, deadline)) {
2649                         frport->time = 0;
2650                         LIBFCOE_FIP_DBG(fip,
2651                                 "port %16.16llx fc_id %6.6x beacon expired\n",
2652                                 rdata->ids.port_name, rdata->ids.port_id);
2653                         lport->tt.rport_logoff(rdata);
2654                 } else if (time_before(deadline, next_time))
2655                         next_time = deadline;
2656         }
2657         mutex_unlock(&lport->disc.disc_mutex);
2658         return next_time;
2659 }
2660
2661 /**
2662  * fcoe_ctlr_vn_recv() - Receive a FIP frame
2663  * @fip: The FCoE controller that received the frame
2664  * @skb: The received FIP frame
2665  *
2666  * Returns non-zero if the frame is dropped.
2667  * Always consumes the frame.
2668  */
2669 static int fcoe_ctlr_vn_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2670 {
2671         struct fip_header *fiph;
2672         enum fip_vn2vn_subcode sub;
2673         struct {
2674                 struct fc_rport_priv rdata;
2675                 struct fcoe_rport frport;
2676         } buf;
2677         int rc;
2678
2679         fiph = (struct fip_header *)skb->data;
2680         sub = fiph->fip_subcode;
2681
2682         rc = fcoe_ctlr_vn_parse(fip, skb, &buf.rdata);
2683         if (rc) {
2684                 LIBFCOE_FIP_DBG(fip, "vn_recv vn_parse error %d\n", rc);
2685                 goto drop;
2686         }
2687
2688         mutex_lock(&fip->ctlr_mutex);
2689         switch (sub) {
2690         case FIP_SC_VN_PROBE_REQ:
2691                 fcoe_ctlr_vn_probe_req(fip, &buf.rdata);
2692                 break;
2693         case FIP_SC_VN_PROBE_REP:
2694                 fcoe_ctlr_vn_probe_reply(fip, &buf.rdata);
2695                 break;
2696         case FIP_SC_VN_CLAIM_NOTIFY:
2697                 fcoe_ctlr_vn_claim_notify(fip, &buf.rdata);
2698                 break;
2699         case FIP_SC_VN_CLAIM_REP:
2700                 fcoe_ctlr_vn_claim_resp(fip, &buf.rdata);
2701                 break;
2702         case FIP_SC_VN_BEACON:
2703                 fcoe_ctlr_vn_beacon(fip, &buf.rdata);
2704                 break;
2705         default:
2706                 LIBFCOE_FIP_DBG(fip, "vn_recv unknown subcode %d\n", sub);
2707                 rc = -1;
2708                 break;
2709         }
2710         mutex_unlock(&fip->ctlr_mutex);
2711 drop:
2712         kfree_skb(skb);
2713         return rc;
2714 }
2715
2716 /**
2717  * fcoe_ctlr_vlan_parse - parse vlan discovery request or response
2718  * @fip: The FCoE controller
2719  * @skb: incoming packet
2720  * @rdata: buffer for resulting parsed VLAN entry plus fcoe_rport
2721  *
2722  * Returns non-zero error number on error.
2723  * Does not consume the packet.
2724  */
2725 static int fcoe_ctlr_vlan_parse(struct fcoe_ctlr *fip,
2726                               struct sk_buff *skb,
2727                               struct fc_rport_priv *rdata)
2728 {
2729         struct fip_header *fiph;
2730         struct fip_desc *desc = NULL;
2731         struct fip_mac_desc *macd = NULL;
2732         struct fip_wwn_desc *wwn = NULL;
2733         struct fcoe_rport *frport;
2734         size_t rlen;
2735         size_t dlen;
2736         u32 desc_mask = 0;
2737         u32 dtype;
2738         u8 sub;
2739
2740         memset(rdata, 0, sizeof(*rdata) + sizeof(*frport));
2741         frport = fcoe_ctlr_rport(rdata);
2742
2743         fiph = (struct fip_header *)skb->data;
2744         frport->flags = ntohs(fiph->fip_flags);
2745
2746         sub = fiph->fip_subcode;
2747         switch (sub) {
2748         case FIP_SC_VL_REQ:
2749                 desc_mask = BIT(FIP_DT_MAC) | BIT(FIP_DT_NAME);
2750                 break;
2751         default:
2752                 LIBFCOE_FIP_DBG(fip, "vn_parse unknown subcode %u\n", sub);
2753                 return -EINVAL;
2754         }
2755
2756         rlen = ntohs(fiph->fip_dl_len) * 4;
2757         if (rlen + sizeof(*fiph) > skb->len)
2758                 return -EINVAL;
2759
2760         desc = (struct fip_desc *)(fiph + 1);
2761         while (rlen > 0) {
2762                 dlen = desc->fip_dlen * FIP_BPW;
2763                 if (dlen < sizeof(*desc) || dlen > rlen)
2764                         return -EINVAL;
2765
2766                 dtype = desc->fip_dtype;
2767                 if (dtype < 32) {
2768                         if (!(desc_mask & BIT(dtype))) {
2769                                 LIBFCOE_FIP_DBG(fip,
2770                                                 "unexpected or duplicated desc "
2771                                                 "desc type %u in "
2772                                                 "FIP VN2VN subtype %u\n",
2773                                                 dtype, sub);
2774                                 return -EINVAL;
2775                         }
2776                         desc_mask &= ~BIT(dtype);
2777                 }
2778
2779                 switch (dtype) {
2780                 case FIP_DT_MAC:
2781                         if (dlen != sizeof(struct fip_mac_desc))
2782                                 goto len_err;
2783                         macd = (struct fip_mac_desc *)desc;
2784                         if (!is_valid_ether_addr(macd->fd_mac)) {
2785                                 LIBFCOE_FIP_DBG(fip,
2786                                         "Invalid MAC addr %pM in FIP VN2VN\n",
2787                                          macd->fd_mac);
2788                                 return -EINVAL;
2789                         }
2790                         memcpy(frport->enode_mac, macd->fd_mac, ETH_ALEN);
2791                         break;
2792                 case FIP_DT_NAME:
2793                         if (dlen != sizeof(struct fip_wwn_desc))
2794                                 goto len_err;
2795                         wwn = (struct fip_wwn_desc *)desc;
2796                         rdata->ids.node_name = get_unaligned_be64(&wwn->fd_wwn);
2797                         break;
2798                 default:
2799                         LIBFCOE_FIP_DBG(fip, "unexpected descriptor type %x "
2800                                         "in FIP probe\n", dtype);
2801                         /* standard says ignore unknown descriptors >= 128 */
2802                         if (dtype < FIP_DT_NON_CRITICAL)
2803                                 return -EINVAL;
2804                         break;
2805                 }
2806                 desc = (struct fip_desc *)((char *)desc + dlen);
2807                 rlen -= dlen;
2808         }
2809         return 0;
2810
2811 len_err:
2812         LIBFCOE_FIP_DBG(fip, "FIP length error in descriptor type %x len %zu\n",
2813                         dtype, dlen);
2814         return -EINVAL;
2815 }
2816
2817 /**
2818  * fcoe_ctlr_vlan_send() - Send a FIP VLAN Notification
2819  * @fip: The FCoE controller
2820  * @sub: sub-opcode for vlan notification or vn2vn vlan notification
2821  * @dest: The destination Ethernet MAC address
2822  * @min_len: minimum size of the Ethernet payload to be sent
2823  */
2824 static void fcoe_ctlr_vlan_send(struct fcoe_ctlr *fip,
2825                               enum fip_vlan_subcode sub,
2826                               const u8 *dest)
2827 {
2828         struct sk_buff *skb;
2829         struct fip_vlan_notify_frame {
2830                 struct ethhdr eth;
2831                 struct fip_header fip;
2832                 struct fip_mac_desc mac;
2833                 struct fip_vlan_desc vlan;
2834         } __packed * frame;
2835         size_t len;
2836         size_t dlen;
2837
2838         len = sizeof(*frame);
2839         dlen = sizeof(frame->mac) + sizeof(frame->vlan);
2840         len = max(len, sizeof(struct ethhdr));
2841
2842         skb = dev_alloc_skb(len);
2843         if (!skb)
2844                 return;
2845
2846         LIBFCOE_FIP_DBG(fip, "fip %s vlan notification, vlan %d\n",
2847                         fip->mode == FIP_MODE_VN2VN ? "vn2vn" : "fcf",
2848                         fip->lp->vlan);
2849
2850         frame = (struct fip_vlan_notify_frame *)skb->data;
2851         memset(frame, 0, len);
2852         memcpy(frame->eth.h_dest, dest, ETH_ALEN);
2853
2854         memcpy(frame->eth.h_source, fip->ctl_src_addr, ETH_ALEN);
2855         frame->eth.h_proto = htons(ETH_P_FIP);
2856
2857         frame->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
2858         frame->fip.fip_op = htons(FIP_OP_VLAN);
2859         frame->fip.fip_subcode = sub;
2860         frame->fip.fip_dl_len = htons(dlen / FIP_BPW);
2861
2862         frame->mac.fd_desc.fip_dtype = FIP_DT_MAC;
2863         frame->mac.fd_desc.fip_dlen = sizeof(frame->mac) / FIP_BPW;
2864         memcpy(frame->mac.fd_mac, fip->ctl_src_addr, ETH_ALEN);
2865
2866         frame->vlan.fd_desc.fip_dtype = FIP_DT_VLAN;
2867         frame->vlan.fd_desc.fip_dlen = sizeof(frame->vlan) / FIP_BPW;
2868         put_unaligned_be16(fip->lp->vlan, &frame->vlan.fd_vlan);
2869
2870         skb_put(skb, len);
2871         skb->protocol = htons(ETH_P_FIP);
2872         skb->priority = fip->priority;
2873         skb_reset_mac_header(skb);
2874         skb_reset_network_header(skb);
2875
2876         fip->send(fip, skb);
2877 }
2878
2879 /**
2880  * fcoe_ctlr_vlan_disk_reply() - send FIP VLAN Discovery Notification.
2881  * @fip: The FCoE controller
2882  *
2883  * Called with ctlr_mutex held.
2884  */
2885 static void fcoe_ctlr_vlan_disc_reply(struct fcoe_ctlr *fip,
2886                                       struct fc_rport_priv *rdata)
2887 {
2888         struct fcoe_rport *frport = fcoe_ctlr_rport(rdata);
2889         enum fip_vlan_subcode sub = FIP_SC_VL_NOTE;
2890
2891         if (fip->mode == FIP_MODE_VN2VN)
2892                 sub = FIP_SC_VL_VN2VN_NOTE;
2893
2894         fcoe_ctlr_vlan_send(fip, sub, frport->enode_mac);
2895 }
2896
2897 /**
2898  * fcoe_ctlr_vlan_recv - vlan request receive handler for VN2VN mode.
2899  * @lport: The local port
2900  * @fp: The received frame
2901  *
2902  */
2903 static int fcoe_ctlr_vlan_recv(struct fcoe_ctlr *fip, struct sk_buff *skb)
2904 {
2905         struct fip_header *fiph;
2906         enum fip_vlan_subcode sub;
2907         struct {
2908                 struct fc_rport_priv rdata;
2909                 struct fcoe_rport frport;
2910         } buf;
2911         int rc;
2912
2913         fiph = (struct fip_header *)skb->data;
2914         sub = fiph->fip_subcode;
2915         rc = fcoe_ctlr_vlan_parse(fip, skb, &buf.rdata);
2916         if (rc) {
2917                 LIBFCOE_FIP_DBG(fip, "vlan_recv vlan_parse error %d\n", rc);
2918                 goto drop;
2919         }
2920         mutex_lock(&fip->ctlr_mutex);
2921         if (sub == FIP_SC_VL_REQ)
2922                 fcoe_ctlr_vlan_disc_reply(fip, &buf.rdata);
2923         mutex_unlock(&fip->ctlr_mutex);
2924
2925 drop:
2926         kfree_skb(skb);
2927         return rc;
2928 }
2929
2930 /**
2931  * fcoe_ctlr_disc_recv - discovery receive handler for VN2VN mode.
2932  * @lport: The local port
2933  * @fp: The received frame
2934  *
2935  * This should never be called since we don't see RSCNs or other
2936  * fabric-generated ELSes.
2937  */
2938 static void fcoe_ctlr_disc_recv(struct fc_lport *lport, struct fc_frame *fp)
2939 {
2940         struct fc_seq_els_data rjt_data;
2941
2942         rjt_data.reason = ELS_RJT_UNSUP;
2943         rjt_data.explan = ELS_EXPL_NONE;
2944         lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data);
2945         fc_frame_free(fp);
2946 }
2947
2948 /**
2949  * fcoe_ctlr_disc_recv - start discovery for VN2VN mode.
2950  * @fip: The FCoE controller
2951  *
2952  * This sets a flag indicating that remote ports should be created
2953  * and started for the peers we discover.  We use the disc_callback
2954  * pointer as that flag.  Peers already discovered are created here.
2955  *
2956  * The lport lock is held during this call. The callback must be done
2957  * later, without holding either the lport or discovery locks.
2958  * The fcoe_ctlr lock may also be held during this call.
2959  */
2960 static void fcoe_ctlr_disc_start(void (*callback)(struct fc_lport *,
2961                                                   enum fc_disc_event),
2962                                  struct fc_lport *lport)
2963 {
2964         struct fc_disc *disc = &lport->disc;
2965         struct fcoe_ctlr *fip = disc->priv;
2966
2967         mutex_lock(&disc->disc_mutex);
2968         disc->disc_callback = callback;
2969         disc->disc_id = (disc->disc_id + 2) | 1;
2970         disc->pending = 1;
2971         schedule_work(&fip->timer_work);
2972         mutex_unlock(&disc->disc_mutex);
2973 }
2974
2975 /**
2976  * fcoe_ctlr_vn_disc() - report FIP VN_port discovery results after claim state.
2977  * @fip: The FCoE controller
2978  *
2979  * Starts the FLOGI and PLOGI login process to each discovered rport for which
2980  * we've received at least one beacon.
2981  * Performs the discovery complete callback.
2982  */
2983 static void fcoe_ctlr_vn_disc(struct fcoe_ctlr *fip)
2984 {
2985         struct fc_lport *lport = fip->lp;
2986         struct fc_disc *disc = &lport->disc;
2987         struct fc_rport_priv *rdata;
2988         struct fcoe_rport *frport;
2989         void (*callback)(struct fc_lport *, enum fc_disc_event);
2990
2991         mutex_lock(&disc->disc_mutex);
2992         callback = disc->pending ? disc->disc_callback : NULL;
2993         disc->pending = 0;
2994         list_for_each_entry_rcu(rdata, &disc->rports, peers) {
2995                 frport = fcoe_ctlr_rport(rdata);
2996                 if (frport->time)
2997                         lport->tt.rport_login(rdata);
2998         }
2999         mutex_unlock(&disc->disc_mutex);
3000         if (callback)
3001                 callback(lport, DISC_EV_SUCCESS);
3002 }
3003
3004 /**
3005  * fcoe_ctlr_vn_timeout - timer work function for VN2VN mode.
3006  * @fip: The FCoE controller
3007  */
3008 static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
3009 {
3010         unsigned long next_time;
3011         u8 mac[ETH_ALEN];
3012         u32 new_port_id = 0;
3013
3014         mutex_lock(&fip->ctlr_mutex);
3015         switch (fip->state) {
3016         case FIP_ST_VNMP_START:
3017                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE1);
3018                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
3019                 next_time = jiffies + msecs_to_jiffies(FIP_VN_PROBE_WAIT);
3020                 break;
3021         case FIP_ST_VNMP_PROBE1:
3022                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_PROBE2);
3023                 fcoe_ctlr_vn_send(fip, FIP_SC_VN_PROBE_REQ, fcoe_all_vn2vn, 0);
3024                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3025                 break;
3026         case FIP_ST_VNMP_PROBE2:
3027                 fcoe_ctlr_set_state(fip, FIP_ST_VNMP_CLAIM);
3028                 new_port_id = fip->port_id;
3029                 hton24(mac, FIP_VN_FC_MAP);
3030                 hton24(mac + 3, new_port_id);
3031                 fcoe_ctlr_map_dest(fip);
3032                 fip->update_mac(fip->lp, mac);
3033                 fcoe_ctlr_vn_send_claim(fip);
3034                 next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3035                 break;
3036         case FIP_ST_VNMP_CLAIM:
3037                 /*
3038                  * This may be invoked either by starting discovery so don't
3039                  * go to the next state unless it's been long enough.
3040                  */
3041                 next_time = fip->sol_time + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3042                 if (time_after_eq(jiffies, next_time)) {
3043                         fcoe_ctlr_set_state(fip, FIP_ST_VNMP_UP);
3044                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
3045                                           fcoe_all_vn2vn, 0);
3046                         next_time = jiffies + msecs_to_jiffies(FIP_VN_ANN_WAIT);
3047                         fip->port_ka_time = next_time;
3048                 }
3049                 fcoe_ctlr_vn_disc(fip);
3050                 break;
3051         case FIP_ST_VNMP_UP:
3052                 next_time = fcoe_ctlr_vn_age(fip);
3053                 if (time_after_eq(jiffies, fip->port_ka_time)) {
3054                         fcoe_ctlr_vn_send(fip, FIP_SC_VN_BEACON,
3055                                           fcoe_all_vn2vn, 0);
3056                         fip->port_ka_time = jiffies +
3057                                  msecs_to_jiffies(FIP_VN_BEACON_INT +
3058                                         (prandom_u32() % FIP_VN_BEACON_FUZZ));
3059                 }
3060                 if (time_before(fip->port_ka_time, next_time))
3061                         next_time = fip->port_ka_time;
3062                 break;
3063         case FIP_ST_LINK_WAIT:
3064                 goto unlock;
3065         default:
3066                 WARN(1, "unexpected state %d\n", fip->state);
3067                 goto unlock;
3068         }
3069         mod_timer(&fip->timer, next_time);
3070 unlock:
3071         mutex_unlock(&fip->ctlr_mutex);
3072
3073         /* If port ID is new, notify local port after dropping ctlr_mutex */
3074         if (new_port_id)
3075                 fc_lport_set_local_id(fip->lp, new_port_id);
3076 }
3077
3078 /**
3079  * fcoe_ctlr_mode_set() - Set or reset the ctlr's mode
3080  * @lport: The local port to be (re)configured
3081  * @fip:   The FCoE controller whose mode is changing
3082  * @fip_mode: The new fip mode
3083  *
3084  * Note that the we shouldn't be changing the libfc discovery settings
3085  * (fc_disc_config) while an lport is going through the libfc state
3086  * machine. The mode can only be changed when a fcoe_ctlr device is
3087  * disabled, so that should ensure that this routine is only called
3088  * when nothing is happening.
3089  */
3090 static void fcoe_ctlr_mode_set(struct fc_lport *lport, struct fcoe_ctlr *fip,
3091                                enum fip_mode fip_mode)
3092 {
3093         void *priv;
3094
3095         WARN_ON(lport->state != LPORT_ST_RESET &&
3096                 lport->state != LPORT_ST_DISABLED);
3097
3098         if (fip_mode == FIP_MODE_VN2VN) {
3099                 lport->rport_priv_size = sizeof(struct fcoe_rport);
3100                 lport->point_to_multipoint = 1;
3101                 lport->tt.disc_recv_req = fcoe_ctlr_disc_recv;
3102                 lport->tt.disc_start = fcoe_ctlr_disc_start;
3103                 lport->tt.disc_stop = fcoe_ctlr_disc_stop;
3104                 lport->tt.disc_stop_final = fcoe_ctlr_disc_stop_final;
3105                 priv = fip;
3106         } else {
3107                 lport->rport_priv_size = 0;
3108                 lport->point_to_multipoint = 0;
3109                 lport->tt.disc_recv_req = NULL;
3110                 lport->tt.disc_start = NULL;
3111                 lport->tt.disc_stop = NULL;
3112                 lport->tt.disc_stop_final = NULL;
3113                 priv = lport;
3114         }
3115
3116         fc_disc_config(lport, priv);
3117 }
3118
3119 /**
3120  * fcoe_libfc_config() - Sets up libfc related properties for local port
3121  * @lport:    The local port to configure libfc for
3122  * @fip:      The FCoE controller in use by the local port
3123  * @tt:       The libfc function template
3124  * @init_fcp: If non-zero, the FCP portion of libfc should be initialized
3125  *
3126  * Returns : 0 for success
3127  */
3128 int fcoe_libfc_config(struct fc_lport *lport, struct fcoe_ctlr *fip,
3129                       const struct libfc_function_template *tt, int init_fcp)
3130 {
3131         /* Set the function pointers set by the LLDD */
3132         memcpy(&lport->tt, tt, sizeof(*tt));
3133         if (init_fcp && fc_fcp_init(lport))
3134                 return -ENOMEM;
3135         fc_exch_init(lport);
3136         fc_elsct_init(lport);
3137         fc_lport_init(lport);
3138         fc_rport_init(lport);
3139         fc_disc_init(lport);
3140         fcoe_ctlr_mode_set(lport, fip, fip->mode);
3141         return 0;
3142 }
3143 EXPORT_SYMBOL_GPL(fcoe_libfc_config);
3144
3145 void fcoe_fcf_get_selected(struct fcoe_fcf_device *fcf_dev)
3146 {
3147         struct fcoe_ctlr_device *ctlr_dev = fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
3148         struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
3149         struct fcoe_fcf *fcf;
3150
3151         mutex_lock(&fip->ctlr_mutex);
3152         mutex_lock(&ctlr_dev->lock);
3153
3154         fcf = fcoe_fcf_device_priv(fcf_dev);
3155         if (fcf)
3156                 fcf_dev->selected = (fcf == fip->sel_fcf) ? 1 : 0;
3157         else
3158                 fcf_dev->selected = 0;
3159
3160         mutex_unlock(&ctlr_dev->lock);
3161         mutex_unlock(&fip->ctlr_mutex);
3162 }
3163 EXPORT_SYMBOL(fcoe_fcf_get_selected);
3164
3165 void fcoe_ctlr_set_fip_mode(struct fcoe_ctlr_device *ctlr_dev)
3166 {
3167         struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
3168         struct fc_lport *lport = ctlr->lp;
3169
3170         mutex_lock(&ctlr->ctlr_mutex);
3171         switch (ctlr_dev->mode) {
3172         case FIP_CONN_TYPE_VN2VN:
3173                 ctlr->mode = FIP_MODE_VN2VN;
3174                 break;
3175         case FIP_CONN_TYPE_FABRIC:
3176         default:
3177                 ctlr->mode = FIP_MODE_FABRIC;
3178                 break;
3179         }
3180
3181         mutex_unlock(&ctlr->ctlr_mutex);
3182
3183         fcoe_ctlr_mode_set(lport, ctlr, ctlr->mode);
3184 }
3185 EXPORT_SYMBOL(fcoe_ctlr_set_fip_mode);