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