kernel/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         spin_lock_irqsave(&rnet->tx_lock, flags);
 178
 179         if (is_multicast_ether_addr(eth->h_dest))
 180                 add_num = nets[rnet->mport->id].nact;
 181
 182         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 183                 netif_stop_queue(ndev);
 184                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 185                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 186                        ndev->name);
 187                 return NETDEV_TX_BUSY;
 188         }
 189
 190         if (is_multicast_ether_addr(eth->h_dest)) {
 191                 int count = 0;
 192
 193                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 194                                 i++)
 195                         if (nets[rnet->mport->id].active[i]) {
 196                                 rionet_queue_tx_msg(skb, ndev,
 197                                         nets[rnet->mport->id].active[i]);
 198                                 if (count)
 199                                         atomic_inc(&skb->users);
 200                                 count++;
 201                         }
 202         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 203                 destid = RIONET_GET_DESTID(eth->h_dest);
 204                 if (nets[rnet->mport->id].active[destid])
 205                         rionet_queue_tx_msg(skb, ndev,
 206                                         nets[rnet->mport->id].active[destid]);
 207                 else {
 208                         /*
 209                          * If the target device was removed from the list of
 210                          * active peers but we still have TX packets targeting
 211                          * it just report sending a packet to the target
 212                          * (without actual packet transfer).
 213                          */
 214                         dev_kfree_skb_any(skb);
 215                         ndev->stats.tx_packets++;
 216                         ndev->stats.tx_bytes += skb->len;
 217                 }
 218         }
 219
 220         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 221
 222         return NETDEV_TX_OK;
 223 }
 224
 225 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 226                                u16 info)
 227 {
 228         struct net_device *ndev = dev_id;
 229         struct rionet_private *rnet = netdev_priv(ndev);
 230         struct rionet_peer *peer;
 231
 232         if (netif_msg_intr(rnet))
 233                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 234                        DRV_NAME, sid, tid, info);
 235         if (info == RIONET_DOORBELL_JOIN) {
 236                 if (!nets[rnet->mport->id].active[sid]) {
 237                         list_for_each_entry(peer,
 238                                            &nets[rnet->mport->id].peers, node) {
 239                                 if (peer->rdev->destid == sid) {
 240                                         nets[rnet->mport->id].active[sid] =
 241                                                                 peer->rdev;
 242                                         nets[rnet->mport->id].nact++;
 243                                 }
 244                         }
 245                         rio_mport_send_doorbell(mport, sid,
 246                                                 RIONET_DOORBELL_JOIN);
 247                 }
 248         } else if (info == RIONET_DOORBELL_LEAVE) {
 249                 nets[rnet->mport->id].active[sid] = NULL;
 250                 nets[rnet->mport->id].nact--;
 251         } else {
 252                 if (netif_msg_intr(rnet))
 253                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 254                                DRV_NAME);
 255         }
 256 }
 257
 258 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 259 {
 260         int n;
 261         struct net_device *ndev = dev_id;
 262         struct rionet_private *rnet = netdev_priv(ndev);
 263
 264         if (netif_msg_intr(rnet))
 265                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 266                        DRV_NAME, mbox, slot);
 267
 268         spin_lock(&rnet->lock);
 269         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 270                 rionet_rx_fill(ndev, n);
 271         spin_unlock(&rnet->lock);
 272 }
 273
 274 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 275 {
 276         struct net_device *ndev = dev_id;
 277         struct rionet_private *rnet = netdev_priv(ndev);
 278
 279         spin_lock(&rnet->lock);
 280
 281         if (netif_msg_intr(rnet))
 282                 printk(KERN_INFO
 283                        "%s: outbound message event, mbox %d slot %d\n",
 284                        DRV_NAME, mbox, slot);
 285
 286         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 287                 /* dma unmap single */
 288                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 289                 rnet->tx_skb[rnet->ack_slot] = NULL;
 290                 ++rnet->ack_slot;
 291                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 292                 rnet->tx_cnt--;
 293         }
 294
 295         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 296                 netif_wake_queue(ndev);
 297
 298         spin_unlock(&rnet->lock);
 299 }
 300
 301 static int rionet_open(struct net_device *ndev)
 302 {
 303         int i, rc = 0;
 304         struct rionet_peer *peer, *tmp;
 305         struct rionet_private *rnet = netdev_priv(ndev);
 306
 307         if (netif_msg_ifup(rnet))
 308                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 309
 310         if ((rc = rio_request_inb_dbell(rnet->mport,
 311                                         (void *)ndev,
 312                                         RIONET_DOORBELL_JOIN,
 313                                         RIONET_DOORBELL_LEAVE,
 314                                         rionet_dbell_event)) < 0)
 315                 goto out;
 316
 317         if ((rc = rio_request_inb_mbox(rnet->mport,
 318                                        (void *)ndev,
 319                                        RIONET_MAILBOX,
 320                                        RIONET_RX_RING_SIZE,
 321                                        rionet_inb_msg_event)) < 0)
 322                 goto out;
 323
 324         if ((rc = rio_request_outb_mbox(rnet->mport,
 325                                         (void *)ndev,
 326                                         RIONET_MAILBOX,
 327                                         RIONET_TX_RING_SIZE,
 328                                         rionet_outb_msg_event)) < 0)
 329                 goto out;
 330
 331         /* Initialize inbound message ring */
 332         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 333                 rnet->rx_skb[i] = NULL;
 334         rnet->rx_slot = 0;
 335         rionet_rx_fill(ndev, 0);
 336
 337         rnet->tx_slot = 0;
 338         rnet->tx_cnt = 0;
 339         rnet->ack_slot = 0;
 340
 341         netif_carrier_on(ndev);
 342         netif_start_queue(ndev);
 343
 344         list_for_each_entry_safe(peer, tmp,
 345                                  &nets[rnet->mport->id].peers, node) {
 346                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 347                                                          RIONET_DOORBELL_JOIN,
 348                                                          RIONET_DOORBELL_LEAVE)))
 349                 {
 350                         printk(KERN_ERR "%s: error requesting doorbells\n",
 351                                DRV_NAME);
 352                         continue;
 353                 }
 354
 355                 /* Send a join message */
 356                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 357         }
 358
 359       out:
 360         return rc;
 361 }
 362
 363 static int rionet_close(struct net_device *ndev)
 364 {
 365         struct rionet_private *rnet = netdev_priv(ndev);
 366         struct rionet_peer *peer, *tmp;
 367         int i;
 368
 369         if (netif_msg_ifup(rnet))
 370                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 371
 372         netif_stop_queue(ndev);
 373         netif_carrier_off(ndev);
 374
 375         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 376                 kfree_skb(rnet->rx_skb[i]);
 377
 378         list_for_each_entry_safe(peer, tmp,
 379                                  &nets[rnet->mport->id].peers, node) {
 380                 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
 381                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 382                         nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
 383                 }
 384                 rio_release_outb_dbell(peer->rdev, peer->res);
 385         }
 386
 387         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 388                               RIONET_DOORBELL_LEAVE);
 389         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 390         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 391
 392         return 0;
 393 }
 394
 395 static int rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
 396 {
 397         struct rio_dev *rdev = to_rio_dev(dev);
 398         unsigned char netid = rdev->net->hport->id;
 399         struct rionet_peer *peer, *tmp;
 400
 401         if (dev_rionet_capable(rdev)) {
 402                 list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
 403                         if (peer->rdev == rdev) {
 404                                 if (nets[netid].active[rdev->destid]) {
 405                                         nets[netid].active[rdev->destid] = NULL;
 406                                         nets[netid].nact--;
 407                                 }
 408
 409                                 list_del(&peer->node);
 410                                 kfree(peer);
 411                                 break;
 412                         }
 413                 }
 414         }
 415
 416         return 0;
 417 }
 418
 419 static void rionet_get_drvinfo(struct net_device *ndev,
 420                                struct ethtool_drvinfo *info)
 421 {
 422         struct rionet_private *rnet = netdev_priv(ndev);
 423
 424         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 425         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 426         strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
 427         strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 428 }
 429
 430 static u32 rionet_get_msglevel(struct net_device *ndev)
 431 {
 432         struct rionet_private *rnet = netdev_priv(ndev);
 433
 434         return rnet->msg_enable;
 435 }
 436
 437 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 438 {
 439         struct rionet_private *rnet = netdev_priv(ndev);
 440
 441         rnet->msg_enable = value;
 442 }
 443
 444 static const struct ethtool_ops rionet_ethtool_ops = {
 445         .get_drvinfo = rionet_get_drvinfo,
 446         .get_msglevel = rionet_get_msglevel,
 447         .set_msglevel = rionet_set_msglevel,
 448         .get_link = ethtool_op_get_link,
 449 };
 450
 451 static const struct net_device_ops rionet_netdev_ops = {
 452         .ndo_open               = rionet_open,
 453         .ndo_stop               = rionet_close,
 454         .ndo_start_xmit         = rionet_start_xmit,
 455         .ndo_change_mtu         = eth_change_mtu,
 456         .ndo_validate_addr      = eth_validate_addr,
 457         .ndo_set_mac_address    = eth_mac_addr,
 458 };
 459
 460 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 461 {
 462         int rc = 0;
 463         struct rionet_private *rnet;
 464         u16 device_id;
 465         const size_t rionet_active_bytes = sizeof(void *) *
 466                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 467
 468         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 469                                                 get_order(rionet_active_bytes));
 470         if (!nets[mport->id].active) {
 471                 rc = -ENOMEM;
 472                 goto out;
 473         }
 474         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 475
 476         /* Set up private area */
 477         rnet = netdev_priv(ndev);
 478         rnet->mport = mport;
 479
 480         /* Set the default MAC address */
 481         device_id = rio_local_get_device_id(mport);
 482         ndev->dev_addr[0] = 0x00;
 483         ndev->dev_addr[1] = 0x01;
 484         ndev->dev_addr[2] = 0x00;
 485         ndev->dev_addr[3] = 0x01;
 486         ndev->dev_addr[4] = device_id >> 8;
 487         ndev->dev_addr[5] = device_id & 0xff;
 488
 489         ndev->netdev_ops = &rionet_netdev_ops;
 490         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 491         ndev->features = NETIF_F_LLTX;
 492         SET_NETDEV_DEV(ndev, &mport->dev);
 493         ndev->ethtool_ops = &rionet_ethtool_ops;
 494
 495         spin_lock_init(&rnet->lock);
 496         spin_lock_init(&rnet->tx_lock);
 497
 498         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 499
 500         rc = register_netdev(ndev);
 501         if (rc != 0)
 502                 goto out;
 503
 504         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 505                ndev->name,
 506                DRV_NAME,
 507                DRV_DESC,
 508                DRV_VERSION,
 509                ndev->dev_addr,
 510                mport->name);
 511
 512       out:
 513         return rc;
 514 }
 515
 516 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
 517
 518 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
 519 {
 520         int rc = -ENODEV;
 521         u32 lsrc_ops, ldst_ops;
 522         struct rionet_peer *peer;
 523         struct net_device *ndev = NULL;
 524         struct rio_dev *rdev = to_rio_dev(dev);
 525         unsigned char netid = rdev->net->hport->id;
 526         int oldnet;
 527
 528         if (netid >= RIONET_MAX_NETS)
 529                 return rc;
 530
 531         oldnet = test_and_set_bit(netid, net_table);
 532
 533         /*
 534          * If first time through this net, make sure local device is rionet
 535          * capable and setup netdev (this step will be skipped in later probes
 536          * on the same net).
 537          */
 538         if (!oldnet) {
 539                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 540                                          &lsrc_ops);
 541                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 542                                          &ldst_ops);
 543                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 544                         printk(KERN_ERR
 545                                "%s: local device %s is not network capable\n",
 546                                DRV_NAME, rdev->net->hport->name);
 547                         goto out;
 548                 }
 549
 550                 /* Allocate our net_device structure */
 551                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 552                 if (ndev == NULL) {
 553                         rc = -ENOMEM;
 554                         goto out;
 555                 }
 556                 nets[netid].ndev = ndev;
 557                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 558                 if (rc) {
 559                         printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
 560                                DRV_NAME, rc);
 561                         goto out;
 562                 }
 563
 564                 INIT_LIST_HEAD(&nets[netid].peers);
 565                 nets[netid].nact = 0;
 566         } else if (nets[netid].ndev == NULL)
 567                 goto out;
 568
 569         /*
 570          * If the remote device has mailbox/doorbell capabilities,
 571          * add it to the peer list.
 572          */
 573         if (dev_rionet_capable(rdev)) {
 574                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 575                         rc = -ENOMEM;
 576                         goto out;
 577                 }
 578                 peer->rdev = rdev;
 579                 list_add_tail(&peer->node, &nets[netid].peers);
 580         }
 581
 582         return 0;
 583 out:
 584         return rc;
 585 }
 586
 587 #ifdef MODULE
 588 static struct rio_device_id rionet_id_table[] = {
 589         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
 590         { 0, }  /* terminate list */
 591 };
 592
 593 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
 594 #endif
 595
 596 static struct subsys_interface rionet_interface = {
 597         .name           = "rionet",
 598         .subsys         = &rio_bus_type,
 599         .add_dev        = rionet_add_dev,
 600         .remove_dev     = rionet_remove_dev,
 601 };
 602
 603 static int __init rionet_init(void)
 604 {
 605         return subsys_interface_register(&rionet_interface);
 606 }
 607
 608 static void __exit rionet_exit(void)
 609 {
 610         struct rionet_private *rnet;
 611         struct net_device *ndev;
 612         struct rionet_peer *peer, *tmp;
 613         int i;
 614
 615         for (i = 0; i < RIONET_MAX_NETS; i++) {
 616                 if (nets[i].ndev != NULL) {
 617                         ndev = nets[i].ndev;
 618                         rnet = netdev_priv(ndev);
 619                         unregister_netdev(ndev);
 620
 621                         list_for_each_entry_safe(peer,
 622                                                  tmp, &nets[i].peers, node) {
 623                                 list_del(&peer->node);
 624                                 kfree(peer);
 625                         }
 626
 627                         free_pages((unsigned long)nets[i].active,
 628                                  get_order(sizeof(void *) *
 629                                  RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size)));
 630                         nets[i].active = NULL;
 631
 632                         free_netdev(ndev);
 633                 }
 634         }
 635
 636         subsys_interface_unregister(&rionet_interface);
 637 }
 638
 639 late_initcall(rionet_init);
 640 module_exit(rionet_exit);