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 int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 170 {
 171         int i;
 172         struct rionet_private *rnet = netdev_priv(ndev);
 173         struct ethhdr *eth = (struct ethhdr *)skb->data;
 174         u16 destid;
 175         unsigned long flags;
 176         int add_num = 1;
 177
 178         spin_lock_irqsave(&rnet->tx_lock, flags);
 179
 180         if (is_multicast_ether_addr(eth->h_dest))
 181                 add_num = nets[rnet->mport->id].nact;
 182
 183         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 184                 netif_stop_queue(ndev);
 185                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 186                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 187                        ndev->name);
 188                 return NETDEV_TX_BUSY;
 189         }
 190
 191         if (is_multicast_ether_addr(eth->h_dest)) {
 192                 int count = 0;
 193
 194                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 195                                 i++)
 196                         if (nets[rnet->mport->id].active[i]) {
 197                                 rionet_queue_tx_msg(skb, ndev,
 198                                         nets[rnet->mport->id].active[i]);
 199                                 if (count)
 200                                         refcount_inc(&skb->users);
 201                                 count++;
 202                         }
 203         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 204                 destid = RIONET_GET_DESTID(eth->h_dest);
 205                 if (nets[rnet->mport->id].active[destid])
 206                         rionet_queue_tx_msg(skb, ndev,
 207                                         nets[rnet->mport->id].active[destid]);
 208                 else {
 209                         /*
 210                          * If the target device was removed from the list of
 211                          * active peers but we still have TX packets targeting
 212                          * it just report sending a packet to the target
 213                          * (without actual packet transfer).
 214                          */
 215                         ndev->stats.tx_packets++;
 216                         ndev->stats.tx_bytes += skb->len;
 217                         dev_kfree_skb_any(skb);
 218                 }
 219         }
 220
 221         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 222
 223         return NETDEV_TX_OK;
 224 }
 225
 226 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 227                                u16 info)
 228 {
 229         struct net_device *ndev = dev_id;
 230         struct rionet_private *rnet = netdev_priv(ndev);
 231         struct rionet_peer *peer;
 232         unsigned char netid = rnet->mport->id;
 233
 234         if (netif_msg_intr(rnet))
 235                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 236                        DRV_NAME, sid, tid, info);
 237         if (info == RIONET_DOORBELL_JOIN) {
 238                 if (!nets[netid].active[sid]) {
 239                         spin_lock(&nets[netid].lock);
 240                         list_for_each_entry(peer, &nets[netid].peers, node) {
 241                                 if (peer->rdev->destid == sid) {
 242                                         nets[netid].active[sid] = peer->rdev;
 243                                         nets[netid].nact++;
 244                                 }
 245                         }
 246                         spin_unlock(&nets[netid].lock);
 247
 248                         rio_mport_send_doorbell(mport, sid,
 249                                                 RIONET_DOORBELL_JOIN);
 250                 }
 251         } else if (info == RIONET_DOORBELL_LEAVE) {
 252                 spin_lock(&nets[netid].lock);
 253                 if (nets[netid].active[sid]) {
 254                         nets[netid].active[sid] = NULL;
 255                         nets[netid].nact--;
 256                 }
 257                 spin_unlock(&nets[netid].lock);
 258         } else {
 259                 if (netif_msg_intr(rnet))
 260                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 261                                DRV_NAME);
 262         }
 263 }
 264
 265 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 266 {
 267         int n;
 268         struct net_device *ndev = dev_id;
 269         struct rionet_private *rnet = netdev_priv(ndev);
 270
 271         if (netif_msg_intr(rnet))
 272                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 273                        DRV_NAME, mbox, slot);
 274
 275         spin_lock(&rnet->lock);
 276         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 277                 rionet_rx_fill(ndev, n);
 278         spin_unlock(&rnet->lock);
 279 }
 280
 281 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 282 {
 283         struct net_device *ndev = dev_id;
 284         struct rionet_private *rnet = netdev_priv(ndev);
 285
 286         spin_lock(&rnet->tx_lock);
 287
 288         if (netif_msg_intr(rnet))
 289                 printk(KERN_INFO
 290                        "%s: outbound message event, mbox %d slot %d\n",
 291                        DRV_NAME, mbox, slot);
 292
 293         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 294                 /* dma unmap single */
 295                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 296                 rnet->tx_skb[rnet->ack_slot] = NULL;
 297                 ++rnet->ack_slot;
 298                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 299                 rnet->tx_cnt--;
 300         }
 301
 302         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 303                 netif_wake_queue(ndev);
 304
 305         spin_unlock(&rnet->tx_lock);
 306 }
 307
 308 static int rionet_open(struct net_device *ndev)
 309 {
 310         int i, rc = 0;
 311         struct rionet_peer *peer;
 312         struct rionet_private *rnet = netdev_priv(ndev);
 313         unsigned char netid = rnet->mport->id;
 314         unsigned long flags;
 315
 316         if (netif_msg_ifup(rnet))
 317                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 318
 319         if ((rc = rio_request_inb_dbell(rnet->mport,
 320                                         (void *)ndev,
 321                                         RIONET_DOORBELL_JOIN,
 322                                         RIONET_DOORBELL_LEAVE,
 323                                         rionet_dbell_event)) < 0)
 324                 goto out;
 325
 326         if ((rc = rio_request_inb_mbox(rnet->mport,
 327                                        (void *)ndev,
 328                                        RIONET_MAILBOX,
 329                                        RIONET_RX_RING_SIZE,
 330                                        rionet_inb_msg_event)) < 0)
 331                 goto out;
 332
 333         if ((rc = rio_request_outb_mbox(rnet->mport,
 334                                         (void *)ndev,
 335                                         RIONET_MAILBOX,
 336                                         RIONET_TX_RING_SIZE,
 337                                         rionet_outb_msg_event)) < 0)
 338                 goto out;
 339
 340         /* Initialize inbound message ring */
 341         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 342                 rnet->rx_skb[i] = NULL;
 343         rnet->rx_slot = 0;
 344         rionet_rx_fill(ndev, 0);
 345
 346         rnet->tx_slot = 0;
 347         rnet->tx_cnt = 0;
 348         rnet->ack_slot = 0;
 349
 350         netif_carrier_on(ndev);
 351         netif_start_queue(ndev);
 352
 353         spin_lock_irqsave(&nets[netid].lock, flags);
 354         list_for_each_entry(peer, &nets[netid].peers, node) {
 355                 /* Send a join message */
 356                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 357         }
 358         spin_unlock_irqrestore(&nets[netid].lock, flags);
 359         rnet->open = true;
 360
 361       out:
 362         return rc;
 363 }
 364
 365 static int rionet_close(struct net_device *ndev)
 366 {
 367         struct rionet_private *rnet = netdev_priv(ndev);
 368         struct rionet_peer *peer;
 369         unsigned char netid = rnet->mport->id;
 370         unsigned long flags;
 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         rnet->open = false;
 379
 380         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 381                 kfree_skb(rnet->rx_skb[i]);
 382
 383         spin_lock_irqsave(&nets[netid].lock, flags);
 384         list_for_each_entry(peer, &nets[netid].peers, node) {
 385                 if (nets[netid].active[peer->rdev->destid]) {
 386                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 387                         nets[netid].active[peer->rdev->destid] = NULL;
 388                 }
 389                 if (peer->res)
 390                         rio_release_outb_dbell(peer->rdev, peer->res);
 391         }
 392         spin_unlock_irqrestore(&nets[netid].lock, flags);
 393
 394         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 395                               RIONET_DOORBELL_LEAVE);
 396         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 397         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 398
 399         return 0;
 400 }
 401
 402 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif)
 403 {
 404         struct rio_dev *rdev = to_rio_dev(dev);
 405         unsigned char netid = rdev->net->hport->id;
 406         struct rionet_peer *peer;
 407         int state, found = 0;
 408         unsigned long flags;
 409
 410         if (!dev_rionet_capable(rdev))
 411                 return;
 412
 413         spin_lock_irqsave(&nets[netid].lock, flags);
 414         list_for_each_entry(peer, &nets[netid].peers, node) {
 415                 if (peer->rdev == rdev) {
 416                         list_del(&peer->node);
 417                         if (nets[netid].active[rdev->destid]) {
 418                                 state = atomic_read(&rdev->state);
 419                                 if (state != RIO_DEVICE_GONE &&
 420                                     state != RIO_DEVICE_INITIALIZING) {
 421                                         rio_send_doorbell(rdev,
 422                                                         RIONET_DOORBELL_LEAVE);
 423                                 }
 424                                 nets[netid].active[rdev->destid] = NULL;
 425                                 nets[netid].nact--;
 426                         }
 427                         found = 1;
 428                         break;
 429                 }
 430         }
 431         spin_unlock_irqrestore(&nets[netid].lock, flags);
 432
 433         if (found) {
 434                 if (peer->res)
 435                         rio_release_outb_dbell(rdev, peer->res);
 436                 kfree(peer);
 437         }
 438 }
 439
 440 static void rionet_get_drvinfo(struct net_device *ndev,
 441                                struct ethtool_drvinfo *info)
 442 {
 443         struct rionet_private *rnet = netdev_priv(ndev);
 444
 445         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 446         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 447         strlcpy(info->fw_version, "n/a", sizeof(info->fw_version));
 448         strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info));
 449 }
 450
 451 static u32 rionet_get_msglevel(struct net_device *ndev)
 452 {
 453         struct rionet_private *rnet = netdev_priv(ndev);
 454
 455         return rnet->msg_enable;
 456 }
 457
 458 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 459 {
 460         struct rionet_private *rnet = netdev_priv(ndev);
 461
 462         rnet->msg_enable = value;
 463 }
 464
 465 static const struct ethtool_ops rionet_ethtool_ops = {
 466         .get_drvinfo = rionet_get_drvinfo,
 467         .get_msglevel = rionet_get_msglevel,
 468         .set_msglevel = rionet_set_msglevel,
 469         .get_link = ethtool_op_get_link,
 470 };
 471
 472 static const struct net_device_ops rionet_netdev_ops = {
 473         .ndo_open               = rionet_open,
 474         .ndo_stop               = rionet_close,
 475         .ndo_start_xmit         = rionet_start_xmit,
 476         .ndo_validate_addr      = eth_validate_addr,
 477         .ndo_set_mac_address    = eth_mac_addr,
 478 };
 479
 480 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 481 {
 482         int rc = 0;
 483         struct rionet_private *rnet;
 484         u16 device_id;
 485         const size_t rionet_active_bytes = sizeof(void *) *
 486                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 487
 488         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 489                                                 get_order(rionet_active_bytes));
 490         if (!nets[mport->id].active) {
 491                 rc = -ENOMEM;
 492                 goto out;
 493         }
 494         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 495
 496         /* Set up private area */
 497         rnet = netdev_priv(ndev);
 498         rnet->mport = mport;
 499         rnet->open = false;
 500
 501         /* Set the default MAC address */
 502         device_id = rio_local_get_device_id(mport);
 503         ndev->dev_addr[0] = 0x00;
 504         ndev->dev_addr[1] = 0x01;
 505         ndev->dev_addr[2] = 0x00;
 506         ndev->dev_addr[3] = 0x01;
 507         ndev->dev_addr[4] = device_id >> 8;
 508         ndev->dev_addr[5] = device_id & 0xff;
 509
 510         ndev->netdev_ops = &rionet_netdev_ops;
 511         ndev->mtu = RIONET_MAX_MTU;
 512         /* MTU range: 68 - 4082 */
 513         ndev->min_mtu = ETH_MIN_MTU;
 514         ndev->max_mtu = RIONET_MAX_MTU;
 515         ndev->features = NETIF_F_LLTX;
 516         SET_NETDEV_DEV(ndev, &mport->dev);
 517         ndev->ethtool_ops = &rionet_ethtool_ops;
 518
 519         spin_lock_init(&rnet->lock);
 520         spin_lock_init(&rnet->tx_lock);
 521
 522         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 523
 524         rc = register_netdev(ndev);
 525         if (rc != 0) {
 526                 free_pages((unsigned long)nets[mport->id].active,
 527                            get_order(rionet_active_bytes));
 528                 goto out;
 529         }
 530
 531         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 532                ndev->name,
 533                DRV_NAME,
 534                DRV_DESC,
 535                DRV_VERSION,
 536                ndev->dev_addr,
 537                mport->name);
 538
 539       out:
 540         return rc;
 541 }
 542
 543 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif)
 544 {
 545         int rc = -ENODEV;
 546         u32 lsrc_ops, ldst_ops;
 547         struct rionet_peer *peer;
 548         struct net_device *ndev = NULL;
 549         struct rio_dev *rdev = to_rio_dev(dev);
 550         unsigned char netid = rdev->net->hport->id;
 551
 552         if (netid >= RIONET_MAX_NETS)
 553                 return rc;
 554
 555         /*
 556          * If first time through this net, make sure local device is rionet
 557          * capable and setup netdev (this step will be skipped in later probes
 558          * on the same net).
 559          */
 560         if (!nets[netid].ndev) {
 561                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 562                                          &lsrc_ops);
 563                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 564                                          &ldst_ops);
 565                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 566                         printk(KERN_ERR
 567                                "%s: local device %s is not network capable\n",
 568                                DRV_NAME, rdev->net->hport->name);
 569                         goto out;
 570                 }
 571
 572                 /* Allocate our net_device structure */
 573                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 574                 if (ndev == NULL) {
 575                         rc = -ENOMEM;
 576                         goto out;
 577                 }
 578
 579                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 580                 if (rc) {
 581                         printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n",
 582                                DRV_NAME, rc);
 583                         free_netdev(ndev);
 584                         goto out;
 585                 }
 586
 587                 INIT_LIST_HEAD(&nets[netid].peers);
 588                 spin_lock_init(&nets[netid].lock);
 589                 nets[netid].nact = 0;
 590                 nets[netid].ndev = ndev;
 591         }
 592
 593         /*
 594          * If the remote device has mailbox/doorbell capabilities,
 595          * add it to the peer list.
 596          */
 597         if (dev_rionet_capable(rdev)) {
 598                 struct rionet_private *rnet;
 599                 unsigned long flags;
 600
 601                 rnet = netdev_priv(nets[netid].ndev);
 602
 603                 peer = kzalloc(sizeof(*peer), GFP_KERNEL);
 604                 if (!peer) {
 605                         rc = -ENOMEM;
 606                         goto out;
 607                 }
 608                 peer->rdev = rdev;
 609                 peer->res = rio_request_outb_dbell(peer->rdev,
 610                                                 RIONET_DOORBELL_JOIN,
 611                                                 RIONET_DOORBELL_LEAVE);
 612                 if (!peer->res) {
 613                         pr_err("%s: error requesting doorbells\n", DRV_NAME);
 614                         kfree(peer);
 615                         rc = -ENOMEM;
 616                         goto out;
 617                 }
 618
 619                 spin_lock_irqsave(&nets[netid].lock, flags);
 620                 list_add_tail(&peer->node, &nets[netid].peers);
 621                 spin_unlock_irqrestore(&nets[netid].lock, flags);
 622                 pr_debug("%s: %s add peer %s\n",
 623                          DRV_NAME, __func__, rio_name(rdev));
 624
 625                 /* If netdev is already opened, send join request to new peer */
 626                 if (rnet->open)
 627                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 628         }
 629
 630         return 0;
 631 out:
 632         return rc;
 633 }
 634
 635 static int rionet_shutdown(struct notifier_block *nb, unsigned long code,
 636                            void *unused)
 637 {
 638         struct rionet_peer *peer;
 639         unsigned long flags;
 640         int i;
 641
 642         pr_debug("%s: %s\n", DRV_NAME, __func__);
 643
 644         for (i = 0; i < RIONET_MAX_NETS; i++) {
 645                 if (!nets[i].ndev)
 646                         continue;
 647
 648                 spin_lock_irqsave(&nets[i].lock, flags);
 649                 list_for_each_entry(peer, &nets[i].peers, node) {
 650                         if (nets[i].active[peer->rdev->destid]) {
 651                                 rio_send_doorbell(peer->rdev,
 652                                                   RIONET_DOORBELL_LEAVE);
 653                                 nets[i].active[peer->rdev->destid] = NULL;
 654                         }
 655                 }
 656                 spin_unlock_irqrestore(&nets[i].lock, flags);
 657         }
 658
 659         return NOTIFY_DONE;
 660 }
 661
 662 static void rionet_remove_mport(struct device *dev,
 663                                 struct class_interface *class_intf)
 664 {
 665         struct rio_mport *mport = to_rio_mport(dev);
 666         struct net_device *ndev;
 667         int id = mport->id;
 668
 669         pr_debug("%s %s\n", __func__, mport->name);
 670
 671         WARN(nets[id].nact, "%s called when connected to %d peers\n",
 672              __func__, nets[id].nact);
 673         WARN(!nets[id].ndev, "%s called for mport without NDEV\n",
 674              __func__);
 675
 676         if (nets[id].ndev) {
 677                 ndev = nets[id].ndev;
 678                 netif_stop_queue(ndev);
 679                 unregister_netdev(ndev);
 680
 681                 free_pages((unsigned long)nets[id].active,
 682                            get_order(sizeof(void *) *
 683                            RIO_MAX_ROUTE_ENTRIES(mport->sys_size)));
 684                 nets[id].active = NULL;
 685                 free_netdev(ndev);
 686                 nets[id].ndev = NULL;
 687         }
 688 }
 689
 690 #ifdef MODULE
 691 static struct rio_device_id rionet_id_table[] = {
 692         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)},
 693         { 0, }  /* terminate list */
 694 };
 695
 696 MODULE_DEVICE_TABLE(rapidio, rionet_id_table);
 697 #endif
 698
 699 static struct subsys_interface rionet_interface = {
 700         .name           = "rionet",
 701         .subsys         = &rio_bus_type,
 702         .add_dev        = rionet_add_dev,
 703         .remove_dev     = rionet_remove_dev,
 704 };
 705
 706 static struct notifier_block rionet_notifier = {
 707         .notifier_call = rionet_shutdown,
 708 };
 709
 710 /* the rio_mport_interface is used to handle local mport devices */
 711 static struct class_interface rio_mport_interface __refdata = {
 712         .class = &rio_mport_class,
 713         .add_dev = NULL,
 714         .remove_dev = rionet_remove_mport,
 715 };
 716
 717 static int __init rionet_init(void)
 718 {
 719         int ret;
 720
 721         ret = register_reboot_notifier(&rionet_notifier);
 722         if (ret) {
 723                 pr_err("%s: failed to register reboot notifier (err=%d)\n",
 724                        DRV_NAME, ret);
 725                 return ret;
 726         }
 727
 728         ret = class_interface_register(&rio_mport_interface);
 729         if (ret) {
 730                 pr_err("%s: class_interface_register error: %d\n",
 731                        DRV_NAME, ret);
 732                 return ret;
 733         }
 734
 735         return subsys_interface_register(&rionet_interface);
 736 }
 737
 738 static void __exit rionet_exit(void)
 739 {
 740         unregister_reboot_notifier(&rionet_notifier);
 741         subsys_interface_unregister(&rionet_interface);
 742         class_interface_unregister(&rio_mport_interface);
 743 }
 744
 745 late_initcall(rionet_init);
 746 module_exit(rionet_exit);