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         spin_lock_irqsave(&rnet->tx_lock, flags);
 183
 184         if (is_multicast_ether_addr(eth->h_dest))
 185                 add_num = nets[rnet->mport->id].nact;
 186
 187         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 188                 netif_stop_queue(ndev);
 189                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 190                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 191                        ndev->name);
 192                 return NETDEV_TX_BUSY;
 193         }
 194
 195         if (is_multicast_ether_addr(eth->h_dest)) {
 196                 int count = 0;
 197
 198                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 199                                 i++)
 200                         if (nets[rnet->mport->id].active[i]) {
 201                                 rionet_queue_tx_msg(skb, ndev,
 202                                         nets[rnet->mport->id].active[i]);
 203                                 if (count)
 204                                         atomic_inc(&skb->users);
 205                                 count++;
 206                         }
 207         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 208                 destid = RIONET_GET_DESTID(eth->h_dest);
 209                 if (nets[rnet->mport->id].active[destid])
 210                         rionet_queue_tx_msg(skb, ndev,
 211                                         nets[rnet->mport->id].active[destid]);
 212                 else {
 213                         /*
 214                          * If the target device was removed from the list of
 215                          * active peers but we still have TX packets targeting
 216                          * it just report sending a packet to the target
 217                          * (without actual packet transfer).
 218                          */
 219                         dev_kfree_skb_any(skb);
 220                         ndev->stats.tx_packets++;
 221                         ndev->stats.tx_bytes += skb->len;
 222                 }
 223         }
 224
 225         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 226
 227         return NETDEV_TX_OK;
 228 }
 229
 230 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 231                                u16 info)
 232 {
 233         struct net_device *ndev = dev_id;
 234         struct rionet_private *rnet = netdev_priv(ndev);
 235         struct rionet_peer *peer;
 236         unsigned char netid = rnet->mport->id;
 237
 238         if (netif_msg_intr(rnet))
 239                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 240                        DRV_NAME, sid, tid, info);
 241         if (info == RIONET_DOORBELL_JOIN) {
 242                 if (!nets[netid].active[sid]) {
 243                         spin_lock(&nets[netid].lock);
 244                         list_for_each_entry(peer, &nets[netid].peers, node) {
 245                                 if (peer->rdev->destid == sid) {
 246                                         nets[netid].active[sid] = peer->rdev;
 247                                         nets[netid].nact++;
 248                                 }
 249                         }
 250                         spin_unlock(&nets[netid].lock);
 251
 252                         rio_mport_send_doorbell(mport, sid,
 253                                                 RIONET_DOORBELL_JOIN);
 254                 }
 255         } else if (info == RIONET_DOORBELL_LEAVE) {
 256                 spin_lock(&nets[netid].lock);
 257                 if (nets[netid].active[sid]) {
 258                         nets[netid].active[sid] = NULL;
 259                         nets[netid].nact--;
 260                 }
 261                 spin_unlock(&nets[netid].lock);
 262         } else {
 263                 if (netif_msg_intr(rnet))
 264                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 265                                DRV_NAME);
 266         }
 267 }
 268
 269 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 270 {
 271         int n;
 272         struct net_device *ndev = dev_id;
 273         struct rionet_private *rnet = netdev_priv(ndev);
 274
 275         if (netif_msg_intr(rnet))
 276                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 277                        DRV_NAME, mbox, slot);
 278
 279         spin_lock(&rnet->lock);
 280         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 281                 rionet_rx_fill(ndev, n);
 282         spin_unlock(&rnet->lock);
 283 }
 284
 285 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 286 {
 287         struct net_device *ndev = dev_id;
 288         struct rionet_private *rnet = netdev_priv(ndev);
 289
 290         spin_lock(&rnet->tx_lock);
 291
 292         if (netif_msg_intr(rnet))
 293                 printk(KERN_INFO
 294                        "%s: outbound message event, mbox %d slot %d\n",
 295                        DRV_NAME, mbox, slot);
 296
 297         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 298                 /* dma unmap single */
 299                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 300                 rnet->tx_skb[rnet->ack_slot] = NULL;
 301                 ++rnet->ack_slot;
 302                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 303                 rnet->tx_cnt--;
 304         }
 305
 306         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 307                 netif_wake_queue(ndev);
 308
 309         spin_unlock(&rnet->tx_lock);
 310 }
 311
 312 static int rionet_open(struct net_device *ndev)
 313 {
 314         int i, rc = 0;
 315         struct rionet_peer *peer;
 316         struct rionet_private *rnet = netdev_priv(ndev);
 317         unsigned char netid = rnet->mport->id;
 318         unsigned long flags;
 319
 320         if (netif_msg_ifup(rnet))
 321                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 322
 323         if ((rc = rio_request_inb_dbell(rnet->mport,
 324                                         (void *)ndev,
 325                                         RIONET_DOORBELL_JOIN,
 326                                         RIONET_DOORBELL_LEAVE,
 327                                         rionet_dbell_event)) < 0)
 328                 goto out;
 329
 330         if ((rc = rio_request_inb_mbox(rnet->mport,
 331                                        (void *)ndev,
 332                                        RIONET_MAILBOX,
 333                                        RIONET_RX_RING_SIZE,
 334                                        rionet_inb_msg_event)) < 0)
 335                 goto out;
 336
 337         if ((rc = rio_request_outb_mbox(rnet->mport,
 338                                         (void *)ndev,
 339                                         RIONET_MAILBOX,
 340                                         RIONET_TX_RING_SIZE,
 341                                         rionet_outb_msg_event)) < 0)
 342                 goto out;
 343
 344         /* Initialize inbound message ring */
 345         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 346                 rnet->rx_skb[i] = NULL;
 347         rnet->rx_slot = 0;
 348         rionet_rx_fill(ndev, 0);
 349
 350         rnet->tx_slot = 0;
 351         rnet->tx_cnt = 0;
 352         rnet->ack_slot = 0;
 353
 354         netif_carrier_on(ndev);
 355         netif_start_queue(ndev);
 356
 357         spin_lock_irqsave(&nets[netid].lock, flags);
 358         list_for_each_entry(peer, &nets[netid].peers, node) {
 359                 /* Send a join message */
 360                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 361         }
 362         spin_unlock_irqrestore(&nets[netid].lock, flags);
 363         rnet->open = true;
 364
 365       out:
 366         return rc;
 367 }
 368
 369 static int rionet_close(struct net_device *ndev)
 370 {
 371         struct rionet_private *rnet = netdev_priv(ndev);
 372         struct rionet_peer *peer;
 373         unsigned char netid = rnet->mport->id;
 374         unsigned long flags;
 375         int i;
 376
 377         if (netif_msg_ifup(rnet))
 378                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 379
 380         netif_stop_queue(ndev);
 381         netif_carrier_off(ndev);
 382         rnet->open = false;
 383
 384         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 385                 kfree_skb(rnet->rx_skb[i]);
 386
 387         spin_lock_irqsave(&nets[netid].lock, flags);
 388         list_for_each_entry(peer, &nets[netid].peers, node) {
 389                 if (nets[netid].active[peer->rdev->destid]) {
 390                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 391                         nets[netid].active[peer->rdev->destid] = NULL;
 392                 }
 393                 if (peer->res)
 394                         rio_release_outb_dbell(peer->rdev, peer->res);
 395         }
 396         spin_unlock_irqrestore(&nets[netid].lock, flags);
 397
 398         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 399                               RIONET_DOORBELL_LEAVE);
 400         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 401         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 402
 403         return 0;
 404 }
 405
 406 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
 407 {
 408         struct rio_dev *rdev = to_rio_dev(dev);
 409         unsigned char netid = rdev->net->hport->id;
 410         struct rionet_peer *peer;
 411         int state, found = 0;
 412         unsigned long flags;
 413
 414         if (!dev_rionet_capable(rdev))
 415                 return;
 416
 417         spin_lock_irqsave(&nets[netid].lock, flags);
 418         list_for_each_entry(peer, &nets[netid].peers, node) {
 419                 if (peer->rdev == rdev) {
 420                         list_del(&peer->node);
 421                         if (nets[netid].active[rdev->destid]) {
 422                                 state = atomic_read(&rdev->state);
 423                                 if (state != RIO_DEVICE_GONE &&
 424                                     state != RIO_DEVICE_INITIALIZING) {
 425                                         rio_send_doorbell(rdev,
 426                                                         RIONET_DOORBELL_LEAVE);
 427                                 }
 428                                 nets[netid].active[rdev->destid] = NULL;
 429                                 nets[netid].nact--;
 430                         }
 431                         found = 1;
 432                         break;
 433                 }
 434         }
 435         spin_unlock_irqrestore(&nets[netid].lock, flags);
 436
 437         if (found) {
 438                 if (peer->res)
 439                         rio_release_outb_dbell(rdev, peer->res);
 440                 kfree(peer);
 441         }
 442 }
 443
 444 static void rionet_get_drvinfo(struct net_device *ndev,
 445                                struct ethtool_drvinfo *info)
 446 {
 447         struct rionet_private *rnet = netdev_priv(ndev);
 448
 449         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 450         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 451         strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
 452         strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 453 }
 454
 455 static u32 rionet_get_msglevel(struct net_device *ndev)
 456 {
 457         struct rionet_private *rnet = netdev_priv(ndev);
 458
 459         return rnet->msg_enable;
 460 }
 461
 462 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 463 {
 464         struct rionet_private *rnet = netdev_priv(ndev);
 465
 466         rnet->msg_enable = value;
 467 }
 468
 469 static int rionet_change_mtu(struct net_device *ndev, int new_mtu)
 470 {
 471         if ((new_mtu < 68) || (new_mtu > RIONET_MAX_MTU)) {
 472                 printk(KERN_ERR "%s: Invalid MTU size %d\n",
 473                        ndev->name, new_mtu);
 474                 return -EINVAL;
 475         }
 476         ndev->mtu = new_mtu;
 477         return 0;
 478 }
 479
 480 static const struct ethtool_ops rionet_ethtool_ops = {
 481         .get_drvinfo = rionet_get_drvinfo,
 482         .get_msglevel = rionet_get_msglevel,
 483         .set_msglevel = rionet_set_msglevel,
 484         .get_link = ethtool_op_get_link,
 485 };
 486
 487 static const struct net_device_ops rionet_netdev_ops = {
 488         .ndo_open               = rionet_open,
 489         .ndo_stop               = rionet_close,
 490         .ndo_start_xmit         = rionet_start_xmit,
 491         .ndo_change_mtu         = rionet_change_mtu,
 492         .ndo_validate_addr      = eth_validate_addr,
 493         .ndo_set_mac_address    = eth_mac_addr,
 494 };
 495
 496 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 497 {
 498         int rc = 0;
 499         struct rionet_private *rnet;
 500         u16 device_id;
 501         const size_t rionet_active_bytes = sizeof(void *) *
 502                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 503
 504         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 505                                                 get_order(rionet_active_bytes));
 506         if (!nets[mport->id].active) {
 507                 rc = -ENOMEM;
 508                 goto out;
 509         }
 510         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 511
 512         /* Set up private area */
 513         rnet = netdev_priv(ndev);
 514         rnet->mport = mport;
 515         rnet->open = false;
 516
 517         /* Set the default MAC address */
 518         device_id = rio_local_get_device_id(mport);
 519         ndev->dev_addr[0] = 0x00;
 520         ndev->dev_addr[1] = 0x01;
 521         ndev->dev_addr[2] = 0x00;
 522         ndev->dev_addr[3] = 0x01;
 523         ndev->dev_addr[4] = device_id >> 8;
 524         ndev->dev_addr[5] = device_id & 0xff;
 525
 526         ndev->netdev_ops = &rionet_netdev_ops;
 527         ndev->mtu = RIONET_MAX_MTU;
 528         ndev->features = NETIF_F_LLTX;
 529         SET_NETDEV_DEV(ndev, &mport->dev);
 530         ndev->ethtool_ops = &rionet_ethtool_ops;
 531
 532         spin_lock_init(&rnet->lock);
 533         spin_lock_init(&rnet->tx_lock);
 534
 535         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 536
 537         rc = register_netdev(ndev);
 538         if (rc != 0) {
 539                 free_pages((unsigned long)nets[mport->id].active,
 540                            get_order(rionet_active_bytes));
 541                 goto out;
 542         }
 543
 544         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 545                ndev->name,
 546                DRV_NAME,
 547                DRV_DESC,
 548                DRV_VERSION,
 549                ndev->dev_addr,
 550                mport->name);
 551
 552       out:
 553         return rc;
 554 }
 555
 556 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
 557 {
 558         int rc = -ENODEV;
 559         u32 lsrc_ops, ldst_ops;
 560         struct rionet_peer *peer;
 561         struct net_device *ndev = NULL;
 562         struct rio_dev *rdev = to_rio_dev(dev);
 563         unsigned char netid = rdev->net->hport->id;
 564
 565         if (netid >= RIONET_MAX_NETS)
 566                 return rc;
 567
 568         /*
 569          * If first time through this net, make sure local device is rionet
 570          * capable and setup netdev (this step will be skipped in later probes
 571          * on the same net).
 572          */
 573         if (!nets[netid].ndev) {
 574                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 575                                          &lsrc_ops);
 576                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 577                                          &ldst_ops);
 578                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 579                         printk(KERN_ERR
 580                                "%s: local device %s is not network capable\n",
 581                                DRV_NAME, rdev->net->hport->name);
 582                         goto out;
 583                 }
 584
 585                 /* Allocate our net_device structure */
 586                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 587                 if (ndev == NULL) {
 588                         rc = -ENOMEM;
 589                         goto out;
 590                 }
 591
 592                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 593                 if (rc) {
 594                         printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
 595                                DRV_NAME, rc);
 596                         free_netdev(ndev);
 597                         goto out;
 598                 }
 599
 600                 INIT_LIST_HEAD(&nets[netid].peers);
 601                 spin_lock_init(&nets[netid].lock);
 602                 nets[netid].nact = 0;
 603                 nets[netid].ndev = ndev;
 604         }
 605
 606         /*
 607          * If the remote device has mailbox/doorbell capabilities,
 608          * add it to the peer list.
 609          */
 610         if (dev_rionet_capable(rdev)) {
 611                 struct rionet_private *rnet;
 612                 unsigned long flags;
 613
 614                 rnet = netdev_priv(nets[netid].ndev);
 615
 616                 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
 617                 if (!peer) {
 618                         rc = -ENOMEM;
 619                         goto out;
 620                 }
 621                 peer->rdev = rdev;
 622                 peer->res = rio_request_outb_dbell(peer->rdev,
 623                                                 RIONET_DOORBELL_JOIN,
 624                                                 RIONET_DOORBELL_LEAVE);
 625                 if (!peer->res) {
 626                         pr_err("%s: error requesting doorbells\n", DRV_NAME);
 627                         kfree(peer);
 628                         rc = -ENOMEM;
 629                         goto out;
 630                 }
 631
 632                 spin_lock_irqsave(&nets[netid].lock, flags);
 633                 list_add_tail(&peer->node, &nets[netid].peers);
 634                 spin_unlock_irqrestore(&nets[netid].lock, flags);
 635                 pr_debug("%s: %s add peer %s\n",
 636                          DRV_NAME, __func__, rio_name(rdev));
 637
 638                 /* If netdev is already opened, send join request to new peer */
 639                 if (rnet->open)
 640                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 641         }
 642
 643         return 0;
 644 out:
 645         return rc;
 646 }
 647
 648 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
 649                            void *unused)
 650 {
 651         struct rionet_peer *peer;
 652         unsigned long flags;
 653         int i;
 654
 655         pr_debug("%s: %s\n", DRV_NAME, __func__);
 656
 657         for (i = 0; i < RIONET_MAX_NETS; i++) {
 658                 if (!nets[i].ndev)
 659                         continue;
 660
 661                 spin_lock_irqsave(&nets[i].lock, flags);
 662                 list_for_each_entry(peer, &nets[i].peers, node) {
 663                         if (nets[i].active[peer->rdev->destid]) {
 664                                 rio_send_doorbell(peer->rdev,
 665                                                   RIONET_DOORBELL_LEAVE);
 666                                 nets[i].active[peer->rdev->destid] = NULL;
 667                         }
 668                 }
 669                 spin_unlock_irqrestore(&nets[i].lock, flags);
 670         }
 671
 672         return NOTIFY_DONE;
 673 }
 674
 675 static void rionet_remove_mport(struct device *dev,
 676                                 struct class_interface *class_intf)
 677 {
 678         struct rio_mport *mport = to_rio_mport(dev);
 679         struct net_device *ndev;
 680         int id = mport->id;
 681
 682         pr_debug("%s %s\n", __func__, mport->name);
 683
 684         WARN(nets[id].nact, "%s called when connected to %d peers\n",
 685              __func__, nets[id].nact);
 686         WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
 687              __func__);
 688
 689         if (nets[id].ndev) {
 690                 ndev = nets[id].ndev;
 691                 netif_stop_queue(ndev);
 692                 unregister_netdev(ndev);
 693
 694                 free_pages((unsigned long)nets[id].active,
 695                            get_order(sizeof(void *) *
 696                            RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
 697                 nets[id].active = NULL;
 698                 free_netdev(ndev);
 699                 nets[id].ndev = NULL;
 700         }
 701 }
 702
 703 #ifdef MODULE
 704 static struct rio_device_id rionet_id_table[] = {
 705         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
 706         { 0, }  /* terminate list */
 707 };
 708
 709 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
 710 #endif
 711
 712 static struct subsys_interface rionet_interface = {
 713         .name           = "rionet",
 714         .subsys         = &rio_bus_type,
 715         .add_dev        = rionet_add_dev,
 716         .remove_dev     = rionet_remove_dev,
 717 };
 718
 719 static struct notifier_block rionet_notifier = {
 720         .notifier_call = rionet_shutdown,
 721 };
 722
 723 /* the rio_mport_interface is used to handle local mport devices */
 724 static struct class_interface rio_mport_interface __refdata = {
 725         .class = &rio_mport_class,
 726         .add_dev = NULL,
 727         .remove_dev = rionet_remove_mport,
 728 };
 729
 730 static int __init rionet_init(void)
 731 {
 732         int ret;
 733
 734         ret = register_reboot_notifier(&rionet_notifier);
 735         if (ret) {
 736                 pr_err("%s: failed to register reboot notifier (err=%d)\n",
 737                        DRV_NAME, ret);
 738                 return ret;
 739         }
 740
 741         ret = class_interface_register(&rio_mport_interface);
 742         if (ret) {
 743                 pr_err("%s: class_interface_register error: %d\n",
 744                        DRV_NAME, ret);
 745                 return ret;
 746         }
 747
 748         return subsys_interface_register(&rionet_interface);
 749 }
 750
 751 static void __exit rionet_exit(void)
 752 {
 753         unregister_reboot_notifier(&rionet_notifier);
 754         subsys_interface_unregister(&rionet_interface);
 755         class_interface_unregister(&rio_mport_interface);
 756 }
 757
 758 late_initcall(rionet_init);
 759 module_exit(rionet_exit);