drivers/net/rionet.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * rionet - Ethernet driver over RapidIO messaging services
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/kernel.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/delay.h>
  13 #include <linux/rio.h>
  14 #include <linux/rio_drv.h>
  15 #include <linux/slab.h>
  16 #include <linux/rio_ids.h>
  17
  18 #include <linux/netdevice.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/skbuff.h>
  21 #include <linux/crc32.h>
  22 #include <linux/ethtool.h>
  23 #include <linux/reboot.h>
  24
  25 #define DRV_NAME        "rionet"
  26 #define DRV_VERSION     "0.3"
  27 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
  28 #define DRV_DESC        "Ethernet over RapidIO"
  29
  30 MODULE_AUTHOR(DRV_AUTHOR);
  31 MODULE_DESCRIPTION(DRV_DESC);
  32 MODULE_LICENSE("GPL");
  33
  34 #define RIONET_DEFAULT_MSGLEVEL \
  35                         (NETIF_MSG_DRV          | \
  36                          NETIF_MSG_LINK         | \
  37                          NETIF_MSG_RX_ERR       | \
  38                          NETIF_MSG_TX_ERR)
  39
  40 #define RIONET_DOORBELL_JOIN    0x1000
  41 #define RIONET_DOORBELL_LEAVE   0x1001
  42
  43 #define RIONET_MAILBOX          0
  44
  45 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
  46 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
  47 #define RIONET_MAX_NETS         8
  48 #define RIONET_MSG_SIZE         RIO_MAX_MSG_SIZE
  49 #define RIONET_MAX_MTU          (RIONET_MSG_SIZE - ETH_HLEN)
  50
  51 struct rionet_private {
  52         struct rio_mport *mport;
  53         struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
  54         struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
  55         int rx_slot;
  56         int tx_slot;
  57         int tx_cnt;
  58         int ack_slot;
  59         spinlock_t lock;
  60         spinlock_t tx_lock;
  61         u32 msg_enable;
  62         bool open;
  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         spinlock_t lock;        /* net info access lock */
  75         struct rio_dev **active;
  76         int nact;       /* number of active peers */
  77 };
  78
  79 static struct rionet_net nets[RIONET_MAX_NETS];
  80
  81 #define is_rionet_capable(src_ops, dst_ops)                     \
  82                         ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  83                          (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  84                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  85                          (dst_ops & RIO_DST_OPS_DOORBELL))
  86 #define dev_rionet_capable(dev) \
  87         is_rionet_capable(dev->src_ops, dev->dst_ops)
  88
  89 #define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  90 #define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  91
  92 static int rionet_rx_clean(struct net_device *ndev)
  93 {
  94         int i;
  95         int error = 0;
  96         struct rionet_private *rnet = netdev_priv(ndev);
  97         void *data;
  98
  99         i = rnet->rx_slot;
 100
 101         do {
 102                 if (!rnet->rx_skb[i])
 103                         continue;
 104
 105                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 106                         break;
 107
 108                 rnet->rx_skb[i]->data = data;
 109                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 110                 rnet->rx_skb[i]->protocol =
 111                     eth_type_trans(rnet->rx_skb[i], ndev);
 112                 error = __netif_rx(rnet->rx_skb[i]);
 113
 114                 if (error == NET_RX_DROP) {
 115                         ndev->stats.rx_dropped++;
 116                 } else {
 117                         ndev->stats.rx_packets++;
 118                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 119                 }
 120
 121         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 122
 123         return i;
 124 }
 125
 126 static void rionet_rx_fill(struct net_device *ndev, int end)
 127 {
 128         int i;
 129         struct rionet_private *rnet = netdev_priv(ndev);
 130
 131         i = rnet->rx_slot;
 132         do {
 133                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 134
 135                 if (!rnet->rx_skb[i])
 136                         break;
 137
 138                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 139                                    rnet->rx_skb[i]->data);
 140         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 141
 142         rnet->rx_slot = i;
 143 }
 144
 145 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 146                                struct rio_dev *rdev)
 147 {
 148         struct rionet_private *rnet = netdev_priv(ndev);
 149
 150         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 151         rnet->tx_skb[rnet->tx_slot] = skb;
 152
 153         ndev->stats.tx_packets++;
 154         ndev->stats.tx_bytes += skb->len;
 155
 156         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 157                 netif_stop_queue(ndev);
 158
 159         ++rnet->tx_slot;
 160         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 161
 162         if (netif_msg_tx_queued(rnet))
 163                 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 164                        skb->len);
 165
 166         return 0;
 167 }
 168
 169 static netdev_tx_t rionet_start_xmit(struct sk_buff *skb,
 170                                      struct net_device *ndev)
 171 {
 172         int i;
 173         struct rionet_private *rnet = netdev_priv(ndev);
 174         struct ethhdr *eth = (struct ethhdr *)skb->data;
 175         u16 destid;
 176         unsigned long flags;
 177         int add_num = 1;
 178
 179         spin_lock_irqsave(&rnet->tx_lock, flags);
 180
 181         if (is_multicast_ether_addr(eth->h_dest))
 182                 add_num = nets[rnet->mport->id].nact;
 183
 184         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 185                 netif_stop_queue(ndev);
 186                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 187                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 188                        ndev->name);
 189                 return NETDEV_TX_BUSY;
 190         }
 191
 192         if (is_multicast_ether_addr(eth->h_dest)) {
 193                 int count = 0;
 194
 195                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 196                                 i++)
 197                         if (nets[rnet->mport->id].active[i]) {
 198                                 rionet_queue_tx_msg(skb, ndev,
 199                                         nets[rnet->mport->id].active[i]);
 200                                 if (count)
 201                                         refcount_inc(&skb->users);
 202                                 count++;
 203                         }
 204         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 205                 destid = RIONET_GET_DESTID(eth->h_dest);
 206                 if (nets[rnet->mport->id].active[destid])
 207                         rionet_queue_tx_msg(skb, ndev,
 208                                         nets[rnet->mport->id].active[destid]);
 209                 else {
 210                         /*
 211                          * If the target device was removed from the list of
 212                          * active peers but we still have TX packets targeting
 213                          * it just report sending a packet to the target
 214                          * (without actual packet transfer).
 215                          */
 216                         ndev->stats.tx_packets++;
 217                         ndev->stats.tx_bytes += skb->len;
 218                         dev_kfree_skb_any(skb);
 219                 }
 220         }
 221
 222         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 223
 224         return NETDEV_TX_OK;
 225 }
 226
 227 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 228                                u16 info)
 229 {
 230         struct net_device *ndev = dev_id;
 231         struct rionet_private *rnet = netdev_priv(ndev);
 232         struct rionet_peer *peer;
 233         unsigned char netid = rnet->mport->id;
 234
 235         if (netif_msg_intr(rnet))
 236                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 237                        DRV_NAME, sid, tid, info);
 238         if (info == RIONET_DOORBELL_JOIN) {
 239                 if (!nets[netid].active[sid]) {
 240                         spin_lock(&nets[netid].lock);
 241                         list_for_each_entry(peer, &nets[netid].peers, node) {
 242                                 if (peer->rdev->destid == sid) {
 243                                         nets[netid].active[sid] = peer->rdev;
 244                                         nets[netid].nact++;
 245                                 }
 246                         }
 247                         spin_unlock(&nets[netid].lock);
 248
 249                         rio_mport_send_doorbell(mport, sid,
 250                                                 RIONET_DOORBELL_JOIN);
 251                 }
 252         } else if (info == RIONET_DOORBELL_LEAVE) {
 253                 spin_lock(&nets[netid].lock);
 254                 if (nets[netid].active[sid]) {
 255                         nets[netid].active[sid] = NULL;
 256                         nets[netid].nact--;
 257                 }
 258                 spin_unlock(&nets[netid].lock);
 259         } else {
 260                 if (netif_msg_intr(rnet))
 261                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 262                                DRV_NAME);
 263         }
 264 }
 265
 266 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 267 {
 268         int n;
 269         struct net_device *ndev = dev_id;
 270         struct rionet_private *rnet = netdev_priv(ndev);
 271
 272         if (netif_msg_intr(rnet))
 273                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 274                        DRV_NAME, mbox, slot);
 275
 276         spin_lock(&rnet->lock);
 277         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 278                 rionet_rx_fill(ndev, n);
 279         spin_unlock(&rnet->lock);
 280 }
 281
 282 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 283 {
 284         struct net_device *ndev = dev_id;
 285         struct rionet_private *rnet = netdev_priv(ndev);
 286
 287         spin_lock(&rnet->tx_lock);
 288
 289         if (netif_msg_intr(rnet))
 290                 printk(KERN_INFO
 291                        "%s: outbound message event, mbox %d slot %d\n",
 292                        DRV_NAME, mbox, slot);
 293
 294         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 295                 /* dma unmap single */
 296                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 297                 rnet->tx_skb[rnet->ack_slot] = NULL;
 298                 ++rnet->ack_slot;
 299                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 300                 rnet->tx_cnt--;
 301         }
 302
 303         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 304                 netif_wake_queue(ndev);
 305
 306         spin_unlock(&rnet->tx_lock);
 307 }
 308
 309 static int rionet_open(struct net_device *ndev)
 310 {
 311         int i, rc = 0;
 312         struct rionet_peer *peer;
 313         struct rionet_private *rnet = netdev_priv(ndev);
 314         unsigned char netid = rnet->mport->id;
 315         unsigned long flags;
 316
 317         if (netif_msg_ifup(rnet))
 318                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 319
 320         if ((rc = rio_request_inb_dbell(rnet->mport,
 321                                         (void *)ndev,
 322                                         RIONET_DOORBELL_JOIN,
 323                                         RIONET_DOORBELL_LEAVE,
 324                                         rionet_dbell_event)) < 0)
 325                 goto out;
 326
 327         if ((rc = rio_request_inb_mbox(rnet->mport,
 328                                        (void *)ndev,
 329                                        RIONET_MAILBOX,
 330                                        RIONET_RX_RING_SIZE,
 331                                        rionet_inb_msg_event)) < 0)
 332                 goto out;
 333
 334         if ((rc = rio_request_outb_mbox(rnet->mport,
 335                                         (void *)ndev,
 336                                         RIONET_MAILBOX,
 337                                         RIONET_TX_RING_SIZE,
 338                                         rionet_outb_msg_event)) < 0)
 339                 goto out;
 340
 341         /* Initialize inbound message ring */
 342         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 343                 rnet->rx_skb[i] = NULL;
 344         rnet->rx_slot = 0;
 345         rionet_rx_fill(ndev, 0);
 346
 347         rnet->tx_slot = 0;
 348         rnet->tx_cnt = 0;
 349         rnet->ack_slot = 0;
 350
 351         netif_carrier_on(ndev);
 352         netif_start_queue(ndev);
 353
 354         spin_lock_irqsave(&nets[netid].lock, flags);
 355         list_for_each_entry(peer, &nets[netid].peers, node) {
 356                 /* Send a join message */
 357                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 358         }
 359         spin_unlock_irqrestore(&nets[netid].lock, flags);
 360         rnet->open = true;
 361
 362       out:
 363         return rc;
 364 }
 365
 366 static int rionet_close(struct net_device *ndev)
 367 {
 368         struct rionet_private *rnet = netdev_priv(ndev);
 369         struct rionet_peer *peer;
 370         unsigned char netid = rnet->mport->id;
 371         unsigned long flags;
 372         int i;
 373
 374         if (netif_msg_ifup(rnet))
 375                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 376
 377         netif_stop_queue(ndev);
 378         netif_carrier_off(ndev);
 379         rnet->open = false;
 380
 381         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 382                 kfree_skb(rnet->rx_skb[i]);
 383
 384         spin_lock_irqsave(&nets[netid].lock, flags);
 385         list_for_each_entry(peer, &nets[netid].peers, node) {
 386                 if (nets[netid].active[peer->rdev->destid]) {
 387                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 388                         nets[netid].active[peer->rdev->destid] = NULL;
 389                 }
 390                 if (peer->res)
 391                         rio_release_outb_dbell(peer->rdev, peer->res);
 392         }
 393         spin_unlock_irqrestore(&nets[netid].lock, flags);
 394
 395         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 396                               RIONET_DOORBELL_LEAVE);
 397         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 398         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 399
 400         return 0;
 401 }
 402
 403 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
 404 {
 405         struct rio_dev *rdev = to_rio_dev(dev);
 406         unsigned char netid = rdev->net->hport->id;
 407         struct rionet_peer *peer;
 408         int state, found = 0;
 409         unsigned long flags;
 410
 411         if (!dev_rionet_capable(rdev))
 412                 return;
 413
 414         spin_lock_irqsave(&nets[netid].lock, flags);
 415         list_for_each_entry(peer, &nets[netid].peers, node) {
 416                 if (peer->rdev == rdev) {
 417                         list_del(&peer->node);
 418                         if (nets[netid].active[rdev->destid]) {
 419                                 state = atomic_read(&rdev->state);
 420                                 if (state != RIO_DEVICE_GONE &&
 421                                     state != RIO_DEVICE_INITIALIZING) {
 422                                         rio_send_doorbell(rdev,
 423                                                         RIONET_DOORBELL_LEAVE);
 424                                 }
 425                                 nets[netid].active[rdev->destid] = NULL;
 426                                 nets[netid].nact--;
 427                         }
 428                         found = 1;
 429                         break;
 430                 }
 431         }
 432         spin_unlock_irqrestore(&nets[netid].lock, flags);
 433
 434         if (found) {
 435                 if (peer->res)
 436                         rio_release_outb_dbell(rdev, peer->res);
 437                 kfree(peer);
 438         }
 439 }
 440
 441 static void rionet_get_drvinfo(struct net_device *ndev,
 442                                struct ethtool_drvinfo *info)
 443 {
 444         struct rionet_private *rnet = netdev_priv(ndev);
 445
 446         strscpy(info->driver, DRV_NAME, sizeof(info->driver));
 447         strscpy(info->version, DRV_VERSION, sizeof(info->version));
 448         strscpy(info->fw_version, "n/a", sizeof(info->fw_version));
 449         strscpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 450 }
 451
 452 static u32 rionet_get_msglevel(struct net_device *ndev)
 453 {
 454         struct rionet_private *rnet = netdev_priv(ndev);
 455
 456         return rnet->msg_enable;
 457 }
 458
 459 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 460 {
 461         struct rionet_private *rnet = netdev_priv(ndev);
 462
 463         rnet->msg_enable = value;
 464 }
 465
 466 static const struct ethtool_ops rionet_ethtool_ops = {
 467         .get_drvinfo = rionet_get_drvinfo,
 468         .get_msglevel = rionet_get_msglevel,
 469         .set_msglevel = rionet_set_msglevel,
 470         .get_link = ethtool_op_get_link,
 471 };
 472
 473 static const struct net_device_ops rionet_netdev_ops = {
 474         .ndo_open               = rionet_open,
 475         .ndo_stop               = rionet_close,
 476         .ndo_start_xmit         = rionet_start_xmit,
 477         .ndo_validate_addr      = eth_validate_addr,
 478         .ndo_set_mac_address    = eth_mac_addr,
 479 };
 480
 481 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 482 {
 483         int rc = 0;
 484         struct rionet_private *rnet;
 485         u8 addr[ETH_ALEN];
 486         u16 device_id;
 487         const size_t rionet_active_bytes = sizeof(void *) *
 488                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 489
 490         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 491                                                 get_order(rionet_active_bytes));
 492         if (!nets[mport->id].active) {
 493                 rc = -ENOMEM;
 494                 goto out;
 495         }
 496         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 497
 498         /* Set up private area */
 499         rnet = netdev_priv(ndev);
 500         rnet->mport = mport;
 501         rnet->open = false;
 502
 503         /* Set the default MAC address */
 504         device_id = rio_local_get_device_id(mport);
 505         addr[0] = 0x00;
 506         addr[1] = 0x01;
 507         addr[2] = 0x00;
 508         addr[3] = 0x01;
 509         addr[4] = device_id >> 8;
 510         addr[5] = device_id & 0xff;
 511         eth_hw_addr_set(ndev, addr);
 512
 513         ndev->netdev_ops = &rionet_netdev_ops;
 514         ndev->mtu = RIONET_MAX_MTU;
 515         /* MTU range: 68 - 4082 */
 516         ndev->min_mtu = ETH_MIN_MTU;
 517         ndev->max_mtu = RIONET_MAX_MTU;
 518         ndev->features = NETIF_F_LLTX;
 519         SET_NETDEV_DEV(ndev, &mport->dev);
 520         ndev->ethtool_ops = &rionet_ethtool_ops;
 521
 522         spin_lock_init(&rnet->lock);
 523         spin_lock_init(&rnet->tx_lock);
 524
 525         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 526
 527         rc = register_netdev(ndev);
 528         if (rc != 0) {
 529                 free_pages((unsigned long)nets[mport->id].active,
 530                            get_order(rionet_active_bytes));
 531                 goto out;
 532         }
 533
 534         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 535                ndev->name,
 536                DRV_NAME,
 537                DRV_DESC,
 538                DRV_VERSION,
 539                ndev->dev_addr,
 540                mport->name);
 541
 542       out:
 543         return rc;
 544 }
 545
 546 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
 547 {
 548         int rc = -ENODEV;
 549         u32 lsrc_ops, ldst_ops;
 550         struct rionet_peer *peer;
 551         struct net_device *ndev = NULL;
 552         struct rio_dev *rdev = to_rio_dev(dev);
 553         unsigned char netid = rdev->net->hport->id;
 554
 555         if (netid >= RIONET_MAX_NETS)
 556                 return rc;
 557
 558         /*
 559          * If first time through this net, make sure local device is rionet
 560          * capable and setup netdev (this step will be skipped in later probes
 561          * on the same net).
 562          */
 563         if (!nets[netid].ndev) {
 564                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 565                                          &lsrc_ops);
 566                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 567                                          &ldst_ops);
 568                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 569                         printk(KERN_ERR
 570                                "%s: local device %s is not network capable\n",
 571                                DRV_NAME, rdev->net->hport->name);
 572                         goto out;
 573                 }
 574
 575                 /* Allocate our net_device structure */
 576                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 577                 if (ndev == NULL) {
 578                         rc = -ENOMEM;
 579                         goto out;
 580                 }
 581
 582                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 583                 if (rc) {
 584                         printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
 585                                DRV_NAME, rc);
 586                         free_netdev(ndev);
 587                         goto out;
 588                 }
 589
 590                 INIT_LIST_HEAD(&nets[netid].peers);
 591                 spin_lock_init(&nets[netid].lock);
 592                 nets[netid].nact = 0;
 593                 nets[netid].ndev = ndev;
 594         }
 595
 596         /*
 597          * If the remote device has mailbox/doorbell capabilities,
 598          * add it to the peer list.
 599          */
 600         if (dev_rionet_capable(rdev)) {
 601                 struct rionet_private *rnet;
 602                 unsigned long flags;
 603
 604                 rnet = netdev_priv(nets[netid].ndev);
 605
 606                 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
 607                 if (!peer) {
 608                         rc = -ENOMEM;
 609                         goto out;
 610                 }
 611                 peer->rdev = rdev;
 612                 peer->res = rio_request_outb_dbell(peer->rdev,
 613                                                 RIONET_DOORBELL_JOIN,
 614                                                 RIONET_DOORBELL_LEAVE);
 615                 if (!peer->res) {
 616                         pr_err("%s: error requesting doorbells\n", DRV_NAME);
 617                         kfree(peer);
 618                         rc = -ENOMEM;
 619                         goto out;
 620                 }
 621
 622                 spin_lock_irqsave(&nets[netid].lock, flags);
 623                 list_add_tail(&peer->node, &nets[netid].peers);
 624                 spin_unlock_irqrestore(&nets[netid].lock, flags);
 625                 pr_debug("%s: %s add peer %s\n",
 626                          DRV_NAME, __func__, rio_name(rdev));
 627
 628                 /* If netdev is already opened, send join request to new peer */
 629                 if (rnet->open)
 630                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 631         }
 632
 633         return 0;
 634 out:
 635         return rc;
 636 }
 637
 638 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
 639                            void *unused)
 640 {
 641         struct rionet_peer *peer;
 642         unsigned long flags;
 643         int i;
 644
 645         pr_debug("%s: %s\n", DRV_NAME, __func__);
 646
 647         for (i = 0; i < RIONET_MAX_NETS; i++) {
 648                 if (!nets[i].ndev)
 649                         continue;
 650
 651                 spin_lock_irqsave(&nets[i].lock, flags);
 652                 list_for_each_entry(peer, &nets[i].peers, node) {
 653                         if (nets[i].active[peer->rdev->destid]) {
 654                                 rio_send_doorbell(peer->rdev,
 655                                                   RIONET_DOORBELL_LEAVE);
 656                                 nets[i].active[peer->rdev->destid] = NULL;
 657                         }
 658                 }
 659                 spin_unlock_irqrestore(&nets[i].lock, flags);
 660         }
 661
 662         return NOTIFY_DONE;
 663 }
 664
 665 static void rionet_remove_mport(struct device *dev,
 666                                 struct class_interface *class_intf)
 667 {
 668         struct rio_mport *mport = to_rio_mport(dev);
 669         struct net_device *ndev;
 670         int id = mport->id;
 671
 672         pr_debug("%s %s\n", __func__, mport->name);
 673
 674         WARN(nets[id].nact, "%s called when connected to %d peers\n",
 675              __func__, nets[id].nact);
 676         WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
 677              __func__);
 678
 679         if (nets[id].ndev) {
 680                 ndev = nets[id].ndev;
 681                 netif_stop_queue(ndev);
 682                 unregister_netdev(ndev);
 683
 684                 free_pages((unsigned long)nets[id].active,
 685                            get_order(sizeof(void *) *
 686                            RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
 687                 nets[id].active = NULL;
 688                 free_netdev(ndev);
 689                 nets[id].ndev = NULL;
 690         }
 691 }
 692
 693 #ifdef MODULE
 694 static struct rio_device_id rionet_id_table[] = {
 695         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
 696         { 0, }  /* terminate list */
 697 };
 698
 699 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
 700 #endif
 701
 702 static struct subsys_interface rionet_interface = {
 703         .name           = "rionet",
 704         .subsys         = &rio_bus_type,
 705         .add_dev        = rionet_add_dev,
 706         .remove_dev     = rionet_remove_dev,
 707 };
 708
 709 static struct notifier_block rionet_notifier = {
 710         .notifier_call = rionet_shutdown,
 711 };
 712
 713 /* the rio_mport_interface is used to handle local mport devices */
 714 static struct class_interface rio_mport_interface __refdata = {
 715         .class = &rio_mport_class,
 716         .add_dev = NULL,
 717         .remove_dev = rionet_remove_mport,
 718 };
 719
 720 static int __init rionet_init(void)
 721 {
 722         int ret;
 723
 724         ret = register_reboot_notifier(&rionet_notifier);
 725         if (ret) {
 726                 pr_err("%s: failed to register reboot notifier (err=%d)\n",
 727                        DRV_NAME, ret);
 728                 return ret;
 729         }
 730
 731         ret = class_interface_register(&rio_mport_interface);
 732         if (ret) {
 733                 pr_err("%s: class_interface_register error: %d\n",
 734                        DRV_NAME, ret);
 735                 return ret;
 736         }
 737
 738         return subsys_interface_register(&rionet_interface);
 739 }
 740
 741 static void __exit rionet_exit(void)
 742 {
 743         unregister_reboot_notifier(&rionet_notifier);
 744         subsys_interface_unregister(&rionet_interface);
 745         class_interface_unregister(&rio_mport_interface);
 746 }
 747
 748 late_initcall(rionet_init);
 749 module_exit(rionet_exit);