drivers/net/rionet.c

   1 /*
   2  * rionet - Ethernet driver over RapidIO messaging services
   3  *
   4  * Copyright 2005 MontaVista Software, Inc.
   5  * Matt Porter <mporter@kernel.crashing.org>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/delay.h>
  17 #include <linux/rio.h>
  18 #include <linux/rio_drv.h>
  19 #include <linux/slab.h>
  20 #include <linux/rio_ids.h>
  21
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/crc32.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/reboot.h>
  28
  29 #define DRV_NAME        "rionet"
  30 #define DRV_VERSION     "0.3"
  31 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
  32 #define DRV_DESC        "Ethernet over RapidIO"
  33
  34 MODULE_AUTHOR(DRV_AUTHOR);
  35 MODULE_DESCRIPTION(DRV_DESC);
  36 MODULE_LICENSE("GPL");
  37
  38 #define RIONET_DEFAULT_MSGLEVEL \
  39                         (NETIF_MSG_DRV          | \
  40                          NETIF_MSG_LINK         | \
  41                          NETIF_MSG_RX_ERR       | \
  42                          NETIF_MSG_TX_ERR)
  43
  44 #define RIONET_DOORBELL_JOIN    0x1000
  45 #define RIONET_DOORBELL_LEAVE   0x1001
  46
  47 #define RIONET_MAILBOX          0
  48
  49 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
  50 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
  51 #define RIONET_MAX_NETS         8
  52 #define RIONET_MSG_SIZE         RIO_MAX_MSG_SIZE
  53 #define RIONET_MAX_MTU          (RIONET_MSG_SIZE - ETH_HLEN)
  54
  55 struct rionet_private {
  56         struct rio_mport *mport;
  57         struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
  58         struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
  59         int rx_slot;
  60         int tx_slot;
  61         int tx_cnt;
  62         int ack_slot;
  63         spinlock_t lock;
  64         spinlock_t tx_lock;
  65         u32 msg_enable;
  66         bool open;
  67 };
  68
  69 struct rionet_peer {
  70         struct list_head node;
  71         struct rio_dev *rdev;
  72         struct resource *res;
  73 };
  74
  75 struct rionet_net {
  76         struct net_device *ndev;
  77         struct list_head peers;
  78         spinlock_t lock;        /* net info access lock */
  79         struct rio_dev **active;
  80         int nact;       /* number of active peers */
  81 };
  82
  83 static struct rionet_net nets[RIONET_MAX_NETS];
  84
  85 #define is_rionet_capable(src_ops, dst_ops)                     \
  86                         ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  87                          (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  88                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  89                          (dst_ops & RIO_DST_OPS_DOORBELL))
  90 #define dev_rionet_capable(dev) \
  91         is_rionet_capable(dev->src_ops, dev->dst_ops)
  92
  93 #define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  94 #define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  95
  96 static int rionet_rx_clean(struct net_device *ndev)
  97 {
  98         int i;
  99         int error = 0;
 100         struct rionet_private *rnet = netdev_priv(ndev);
 101         void *data;
 102
 103         i = rnet->rx_slot;
 104
 105         do {
 106                 if (!rnet->rx_skb[i])
 107                         continue;
 108
 109                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 110                         break;
 111
 112                 rnet->rx_skb[i]->data = data;
 113                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 114                 rnet->rx_skb[i]->protocol =
 115                     eth_type_trans(rnet->rx_skb[i], ndev);
 116                 error = netif_rx(rnet->rx_skb[i]);
 117
 118                 if (error == NET_RX_DROP) {
 119                         ndev->stats.rx_dropped++;
 120                 } else {
 121                         ndev->stats.rx_packets++;
 122                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 123                 }
 124
 125         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 126
 127         return i;
 128 }
 129
 130 static void rionet_rx_fill(struct net_device *ndev, int end)
 131 {
 132         int i;
 133         struct rionet_private *rnet = netdev_priv(ndev);
 134
 135         i = rnet->rx_slot;
 136         do {
 137                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 138
 139                 if (!rnet->rx_skb[i])
 140                         break;
 141
 142                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 143                                    rnet->rx_skb[i]->data);
 144         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 145
 146         rnet->rx_slot = i;
 147 }
 148
 149 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 150                                struct rio_dev *rdev)
 151 {
 152         struct rionet_private *rnet = netdev_priv(ndev);
 153
 154         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 155         rnet->tx_skb[rnet->tx_slot] = skb;
 156
 157         ndev->stats.tx_packets++;
 158         ndev->stats.tx_bytes += skb->len;
 159
 160         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 161                 netif_stop_queue(ndev);
 162
 163         ++rnet->tx_slot;
 164         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 165
 166         if (netif_msg_tx_queued(rnet))
 167                 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 168                        skb->len);
 169
 170         return 0;
 171 }
 172
 173 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 174 {
 175         int i;
 176         struct rionet_private *rnet = netdev_priv(ndev);
 177         struct ethhdr *eth = (struct ethhdr *)skb->data;
 178         u16 destid;
 179         unsigned long flags;
 180         int add_num = 1;
 181
 182         local_irq_save(flags);
 183         if (!spin_trylock(&rnet->tx_lock)) {
 184                 local_irq_restore(flags);
 185                 return NETDEV_TX_LOCKED;
 186         }
 187
 188         if (is_multicast_ether_addr(eth->h_dest))
 189                 add_num = nets[rnet->mport->id].nact;
 190
 191         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 192                 netif_stop_queue(ndev);
 193                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 194                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 195                        ndev->name);
 196                 return NETDEV_TX_BUSY;
 197         }
 198
 199         if (is_multicast_ether_addr(eth->h_dest)) {
 200                 int count = 0;
 201
 202                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 203                                 i++)
 204                         if (nets[rnet->mport->id].active[i]) {
 205                                 rionet_queue_tx_msg(skb, ndev,
 206                                         nets[rnet->mport->id].active[i]);
 207                                 if (count)
 208                                         atomic_inc(&skb->users);
 209                                 count++;
 210                         }
 211         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 212                 destid = RIONET_GET_DESTID(eth->h_dest);
 213                 if (nets[rnet->mport->id].active[destid])
 214                         rionet_queue_tx_msg(skb, ndev,
 215                                         nets[rnet->mport->id].active[destid]);
 216                 else {
 217                         /*
 218                          * If the target device was removed from the list of
 219                          * active peers but we still have TX packets targeting
 220                          * it just report sending a packet to the target
 221                          * (without actual packet transfer).
 222                          */
 223                         dev_kfree_skb_any(skb);
 224                         ndev->stats.tx_packets++;
 225                         ndev->stats.tx_bytes += skb->len;
 226                 }
 227         }
 228
 229         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 230
 231         return NETDEV_TX_OK;
 232 }
 233
 234 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 235                                u16 info)
 236 {
 237         struct net_device *ndev = dev_id;
 238         struct rionet_private *rnet = netdev_priv(ndev);
 239         struct rionet_peer *peer;
 240         unsigned char netid = rnet->mport->id;
 241
 242         if (netif_msg_intr(rnet))
 243                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 244                        DRV_NAME, sid, tid, info);
 245         if (info == RIONET_DOORBELL_JOIN) {
 246                 if (!nets[netid].active[sid]) {
 247                         spin_lock(&nets[netid].lock);
 248                         list_for_each_entry(peer, &nets[netid].peers, node) {
 249                                 if (peer->rdev->destid == sid) {
 250                                         nets[netid].active[sid] = peer->rdev;
 251                                         nets[netid].nact++;
 252                                 }
 253                         }
 254                         spin_unlock(&nets[netid].lock);
 255
 256                         rio_mport_send_doorbell(mport, sid,
 257                                                 RIONET_DOORBELL_JOIN);
 258                 }
 259         } else if (info == RIONET_DOORBELL_LEAVE) {
 260                 spin_lock(&nets[netid].lock);
 261                 if (nets[netid].active[sid]) {
 262                         nets[netid].active[sid] = NULL;
 263                         nets[netid].nact--;
 264                 }
 265                 spin_unlock(&nets[netid].lock);
 266         } else {
 267                 if (netif_msg_intr(rnet))
 268                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 269                                DRV_NAME);
 270         }
 271 }
 272
 273 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 274 {
 275         int n;
 276         struct net_device *ndev = dev_id;
 277         struct rionet_private *rnet = netdev_priv(ndev);
 278
 279         if (netif_msg_intr(rnet))
 280                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 281                        DRV_NAME, mbox, slot);
 282
 283         spin_lock(&rnet->lock);
 284         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 285                 rionet_rx_fill(ndev, n);
 286         spin_unlock(&rnet->lock);
 287 }
 288
 289 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 290 {
 291         struct net_device *ndev = dev_id;
 292         struct rionet_private *rnet = netdev_priv(ndev);
 293
 294         spin_lock(&rnet->tx_lock);
 295
 296         if (netif_msg_intr(rnet))
 297                 printk(KERN_INFO
 298                        "%s: outbound message event, mbox %d slot %d\n",
 299                        DRV_NAME, mbox, slot);
 300
 301         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 302                 /* dma unmap single */
 303                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 304                 rnet->tx_skb[rnet->ack_slot] = NULL;
 305                 ++rnet->ack_slot;
 306                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 307                 rnet->tx_cnt--;
 308         }
 309
 310         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 311                 netif_wake_queue(ndev);
 312
 313         spin_unlock(&rnet->tx_lock);
 314 }
 315
 316 static int rionet_open(struct net_device *ndev)
 317 {
 318         int i, rc = 0;
 319         struct rionet_peer *peer;
 320         struct rionet_private *rnet = netdev_priv(ndev);
 321         unsigned char netid = rnet->mport->id;
 322         unsigned long flags;
 323
 324         if (netif_msg_ifup(rnet))
 325                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 326
 327         if ((rc = rio_request_inb_dbell(rnet->mport,
 328                                         (void *)ndev,
 329                                         RIONET_DOORBELL_JOIN,
 330                                         RIONET_DOORBELL_LEAVE,
 331                                         rionet_dbell_event)) < 0)
 332                 goto out;
 333
 334         if ((rc = rio_request_inb_mbox(rnet->mport,
 335                                        (void *)ndev,
 336                                        RIONET_MAILBOX,
 337                                        RIONET_RX_RING_SIZE,
 338                                        rionet_inb_msg_event)) < 0)
 339                 goto out;
 340
 341         if ((rc = rio_request_outb_mbox(rnet->mport,
 342                                         (void *)ndev,
 343                                         RIONET_MAILBOX,
 344                                         RIONET_TX_RING_SIZE,
 345                                         rionet_outb_msg_event)) < 0)
 346                 goto out;
 347
 348         /* Initialize inbound message ring */
 349         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 350                 rnet->rx_skb[i] = NULL;
 351         rnet->rx_slot = 0;
 352         rionet_rx_fill(ndev, 0);
 353
 354         rnet->tx_slot = 0;
 355         rnet->tx_cnt = 0;
 356         rnet->ack_slot = 0;
 357
 358         netif_carrier_on(ndev);
 359         netif_start_queue(ndev);
 360
 361         spin_lock_irqsave(&nets[netid].lock, flags);
 362         list_for_each_entry(peer, &nets[netid].peers, node) {
 363                 /* Send a join message */
 364                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 365         }
 366         spin_unlock_irqrestore(&nets[netid].lock, flags);
 367         rnet->open = true;
 368
 369       out:
 370         return rc;
 371 }
 372
 373 static int rionet_close(struct net_device *ndev)
 374 {
 375         struct rionet_private *rnet = netdev_priv(ndev);
 376         struct rionet_peer *peer;
 377         unsigned char netid = rnet->mport->id;
 378         unsigned long flags;
 379         int i;
 380
 381         if (netif_msg_ifup(rnet))
 382                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 383
 384         netif_stop_queue(ndev);
 385         netif_carrier_off(ndev);
 386         rnet->open = false;
 387
 388         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 389                 kfree_skb(rnet->rx_skb[i]);
 390
 391         spin_lock_irqsave(&nets[netid].lock, flags);
 392         list_for_each_entry(peer, &nets[netid].peers, node) {
 393                 if (nets[netid].active[peer->rdev->destid]) {
 394                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 395                         nets[netid].active[peer->rdev->destid] = NULL;
 396                 }
 397                 if (peer->res)
 398                         rio_release_outb_dbell(peer->rdev, peer->res);
 399         }
 400         spin_unlock_irqrestore(&nets[netid].lock, flags);
 401
 402         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 403                               RIONET_DOORBELL_LEAVE);
 404         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 405         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 406
 407         return 0;
 408 }
 409
 410 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
 411 {
 412         struct rio_dev *rdev = to_rio_dev(dev);
 413         unsigned char netid = rdev->net->hport->id;
 414         struct rionet_peer *peer;
 415         int state, found = 0;
 416         unsigned long flags;
 417
 418         if (!dev_rionet_capable(rdev))
 419                 return;
 420
 421         spin_lock_irqsave(&nets[netid].lock, flags);
 422         list_for_each_entry(peer, &nets[netid].peers, node) {
 423                 if (peer->rdev == rdev) {
 424                         list_del(&peer->node);
 425                         if (nets[netid].active[rdev->destid]) {
 426                                 state = atomic_read(&rdev->state);
 427                                 if (state != RIO_DEVICE_GONE &&
 428                                     state != RIO_DEVICE_INITIALIZING) {
 429                                         rio_send_doorbell(rdev,
 430                                                         RIONET_DOORBELL_LEAVE);
 431                                 }
 432                                 nets[netid].active[rdev->destid] = NULL;
 433                                 nets[netid].nact--;
 434                         }
 435                         found = 1;
 436                         break;
 437                 }
 438         }
 439         spin_unlock_irqrestore(&nets[netid].lock, flags);
 440
 441         if (found) {
 442                 if (peer->res)
 443                         rio_release_outb_dbell(rdev, peer->res);
 444                 kfree(peer);
 445         }
 446 }
 447
 448 static void rionet_get_drvinfo(struct net_device *ndev,
 449                                struct ethtool_drvinfo *info)
 450 {
 451         struct rionet_private *rnet = netdev_priv(ndev);
 452
 453         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 454         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 455         strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
 456         strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 457 }
 458
 459 static u32 rionet_get_msglevel(struct net_device *ndev)
 460 {
 461         struct rionet_private *rnet = netdev_priv(ndev);
 462
 463         return rnet->msg_enable;
 464 }
 465
 466 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 467 {
 468         struct rionet_private *rnet = netdev_priv(ndev);
 469
 470         rnet->msg_enable = value;
 471 }
 472
 473 static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
 474 {
 475         if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
 476                 printk(KERN_ERR "%s: Invalid MTU size %d\n",
 477                        ndev->name, new_mtu);
 478                 return -EINVAL;
 479         }
 480         ndev->mtu = new_mtu;
 481         return 0;
 482 }
 483
 484 static const struct ethtool_ops rionet_ethtool_ops = {
 485         .get_drvinfo = rionet_get_drvinfo,
 486         .get_msglevel = rionet_get_msglevel,
 487         .set_msglevel = rionet_set_msglevel,
 488         .get_link = ethtool_op_get_link,
 489 };
 490
 491 static const struct net_device_ops rionet_netdev_ops = {
 492         .ndo_open               = rionet_open,
 493         .ndo_stop               = rionet_close,
 494         .ndo_start_xmit         = rionet_start_xmit,
 495         .ndo_change_mtu         = rionet_change_mtu,
 496         .ndo_validate_addr      = eth_validate_addr,
 497         .ndo_set_mac_address    = eth_mac_addr,
 498 };
 499
 500 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 501 {
 502         int rc = 0;
 503         struct rionet_private *rnet;
 504         u16 device_id;
 505         const size_t rionet_active_bytes = sizeof(void *) *
 506                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 507
 508         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 509                                                 get_order(rionet_active_bytes));
 510         if (!nets[mport->id].active) {
 511                 rc = -ENOMEM;
 512                 goto out;
 513         }
 514         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 515
 516         /* Set up private area */
 517         rnet = netdev_priv(ndev);
 518         rnet->mport = mport;
 519         rnet->open = false;
 520
 521         /* Set the default MAC address */
 522         device_id = rio_local_get_device_id(mport);
 523         ndev->dev_addr[0] = 0x00;
 524         ndev->dev_addr[1] = 0x01;
 525         ndev->dev_addr[2] = 0x00;
 526         ndev->dev_addr[3] = 0x01;
 527         ndev->dev_addr[4] = device_id >> 8;
 528         ndev->dev_addr[5] = device_id & 0xff;
 529
 530         ndev->netdev_ops = &rionet_netdev_ops;
 531         ndev->mtu = RIONET_MAX_MTU;
 532         ndev->features = NETIF_F_LLTX;
 533         SET_NETDEV_DEV(ndev, &mport->dev);
 534         ndev->ethtool_ops = &rionet_ethtool_ops;
 535
 536         spin_lock_init(&rnet->lock);
 537         spin_lock_init(&rnet->tx_lock);
 538
 539         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 540
 541         rc = register_netdev(ndev);
 542         if (rc != 0) {
 543                 free_pages((unsigned long)nets[mport->id].active,
 544                            get_order(rionet_active_bytes));
 545                 goto out;
 546         }
 547
 548         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 549                ndev->name,
 550                DRV_NAME,
 551                DRV_DESC,
 552                DRV_VERSION,
 553                ndev->dev_addr,
 554                mport->name);
 555
 556       out:
 557         return rc;
 558 }
 559
 560 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
 561 {
 562         int rc = -ENODEV;
 563         u32 lsrc_ops, ldst_ops;
 564         struct rionet_peer *peer;
 565         struct net_device *ndev = NULL;
 566         struct rio_dev *rdev = to_rio_dev(dev);
 567         unsigned char netid = rdev->net->hport->id;
 568
 569         if (netid >= RIONET_MAX_NETS)
 570                 return rc;
 571
 572         /*
 573          * If first time through this net, make sure local device is rionet
 574          * capable and setup netdev (this step will be skipped in later probes
 575          * on the same net).
 576          */
 577         if (!nets[netid].ndev) {
 578                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 579                                          &lsrc_ops);
 580                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 581                                          &ldst_ops);
 582                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 583                         printk(KERN_ERR
 584                                "%s: local device %s is not network capable\n",
 585                                DRV_NAME, rdev->net->hport->name);
 586                         goto out;
 587                 }
 588
 589                 /* Allocate our net_device structure */
 590                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 591                 if (ndev == NULL) {
 592                         rc = -ENOMEM;
 593                         goto out;
 594                 }
 595
 596                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 597                 if (rc) {
 598                         printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
 599                                DRV_NAME, rc);
 600                         free_netdev(ndev);
 601                         goto out;
 602                 }
 603
 604                 INIT_LIST_HEAD(&nets[netid].peers);
 605                 spin_lock_init(&nets[netid].lock);
 606                 nets[netid].nact = 0;
 607                 nets[netid].ndev = ndev;
 608         }
 609
 610         /*
 611          * If the remote device has mailbox/doorbell capabilities,
 612          * add it to the peer list.
 613          */
 614         if (dev_rionet_capable(rdev)) {
 615                 struct rionet_private *rnet;
 616                 unsigned long flags;
 617
 618                 rnet = netdev_priv(nets[netid].ndev);
 619
 620                 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
 621                 if (!peer) {
 622                         rc = -ENOMEM;
 623                         goto out;
 624                 }
 625                 peer->rdev = rdev;
 626                 peer->res = rio_request_outb_dbell(peer->rdev,
 627                                                 RIONET_DOORBELL_JOIN,
 628                                                 RIONET_DOORBELL_LEAVE);
 629                 if (!peer->res) {
 630                         pr_err("%s: error requesting doorbells\n", DRV_NAME);
 631                         kfree(peer);
 632                         rc = -ENOMEM;
 633                         goto out;
 634                 }
 635
 636                 spin_lock_irqsave(&nets[netid].lock, flags);
 637                 list_add_tail(&peer->node, &nets[netid].peers);
 638                 spin_unlock_irqrestore(&nets[netid].lock, flags);
 639                 pr_debug("%s: %s add peer %s\n",
 640                          DRV_NAME, __func__, rio_name(rdev));
 641
 642                 /* If netdev is already opened, send join request to new peer */
 643                 if (rnet->open)
 644                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 645         }
 646
 647         return 0;
 648 out:
 649         return rc;
 650 }
 651
 652 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
 653                            void *unused)
 654 {
 655         struct rionet_peer *peer;
 656         unsigned long flags;
 657         int i;
 658
 659         pr_debug("%s: %s\n", DRV_NAME, __func__);
 660
 661         for (i = 0; i < RIONET_MAX_NETS; i++) {
 662                 if (!nets[i].ndev)
 663                         continue;
 664
 665                 spin_lock_irqsave(&nets[i].lock, flags);
 666                 list_for_each_entry(peer, &nets[i].peers, node) {
 667                         if (nets[i].active[peer->rdev->destid]) {
 668                                 rio_send_doorbell(peer->rdev,
 669                                                   RIONET_DOORBELL_LEAVE);
 670                                 nets[i].active[peer->rdev->destid] = NULL;
 671                         }
 672                 }
 673                 spin_unlock_irqrestore(&nets[i].lock, flags);
 674         }
 675
 676         return NOTIFY_DONE;
 677 }
 678
 679 static void rionet_remove_mport(struct device *dev,
 680                                 struct class_interface *class_intf)
 681 {
 682         struct rio_mport *mport = to_rio_mport(dev);
 683         struct net_device *ndev;
 684         int id = mport->id;
 685
 686         pr_debug("%s %s\n", __func__, mport->name);
 687
 688         WARN(nets[id].nact, "%s called when connected to %d peers\n",
 689              __func__, nets[id].nact);
 690         WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
 691              __func__);
 692
 693         if (nets[id].ndev) {
 694                 ndev = nets[id].ndev;
 695                 netif_stop_queue(ndev);
 696                 unregister_netdev(ndev);
 697
 698                 free_pages((unsigned long)nets[id].active,
 699                            get_order(sizeof(void *) *
 700                            RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
 701                 nets[id].active = NULL;
 702                 free_netdev(ndev);
 703                 nets[id].ndev = NULL;
 704         }
 705 }
 706
 707 #ifdef MODULE
 708 static struct rio_device_id rionet_id_table[] = {
 709         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
 710         { 0, }  /* terminate list */
 711 };
 712
 713 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
 714 #endif
 715
 716 static struct subsys_interface rionet_interface = {
 717         .name           = "rionet",
 718         .subsys         = &rio_bus_type,
 719         .add_dev        = rionet_add_dev,
 720         .remove_dev     = rionet_remove_dev,
 721 };
 722
 723 static struct notifier_block rionet_notifier = {
 724         .notifier_call = rionet_shutdown,
 725 };
 726
 727 /* the rio_mport_interface is used to handle local mport devices */
 728 static struct class_interface rio_mport_interface __refdata = {
 729         .class = &rio_mport_class,
 730         .add_dev = NULL,
 731         .remove_dev = rionet_remove_mport,
 732 };
 733
 734 static int __init rionet_init(void)
 735 {
 736         int ret;
 737
 738         ret = register_reboot_notifier(&rionet_notifier);
 739         if (ret) {
 740                 pr_err("%s: failed to register reboot notifier (err=%d)\n",
 741                        DRV_NAME, ret);
 742                 return ret;
 743         }
 744
 745         ret = class_interface_register(&rio_mport_interface);
 746         if (ret) {
 747                 pr_err("%s: class_interface_register error: %d\n",
 748                        DRV_NAME, ret);
 749                 return ret;
 750         }
 751
 752         return subsys_interface_register(&rionet_interface);
 753 }
 754
 755 static void __exit rionet_exit(void)
 756 {
 757         unregister_reboot_notifier(&rionet_notifier);
 758         subsys_interface_unregister(&rionet_interface);
 759         class_interface_unregister(&rio_mport_interface);
 760 }
 761
 762 late_initcall(rionet_init);
 763 module_exit(rionet_exit);