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