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/rio_ids.h>
  20
  21 #include <linux/netdevice.h>
  22 #include <linux/etherdevice.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/crc32.h>
  25 #include <linux/ethtool.h>
  26
  27 #define DRV_NAME        "rionet"
  28 #define DRV_VERSION     "0.2"
  29 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
  30 #define DRV_DESC        "Ethernet over RapidIO"
  31
  32 MODULE_AUTHOR(DRV_AUTHOR);
  33 MODULE_DESCRIPTION(DRV_DESC);
  34 MODULE_LICENSE("GPL");
  35
  36 #define RIONET_DEFAULT_MSGLEVEL \
  37                         (NETIF_MSG_DRV          | \
  38                          NETIF_MSG_LINK         | \
  39                          NETIF_MSG_RX_ERR       | \
  40                          NETIF_MSG_TX_ERR)
  41
  42 #define RIONET_DOORBELL_JOIN    0x1000
  43 #define RIONET_DOORBELL_LEAVE   0x1001
  44
  45 #define RIONET_MAILBOX          0
  46
  47 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
  48 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
  49
  50 static LIST_HEAD(rionet_peers);
  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         struct net_device_stats stats;
  57         int rx_slot;
  58         int tx_slot;
  59         int tx_cnt;
  60         int ack_slot;
  61         spinlock_t lock;
  62         spinlock_t tx_lock;
  63         u32 msg_enable;
  64 };
  65
  66 struct rionet_peer {
  67         struct list_head node;
  68         struct rio_dev *rdev;
  69         struct resource *res;
  70 };
  71
  72 static int rionet_check = 0;
  73 static int rionet_capable = 1;
  74
  75 /*
  76  * This is a fast lookup table for for translating TX
  77  * Ethernet packets into a destination RIO device. It
  78  * could be made into a hash table to save memory depending
  79  * on system trade-offs.
  80  */
  81 static struct rio_dev *rionet_active[RIO_MAX_ROUTE_ENTRIES];
  82
  83 #define is_rionet_capable(pef, src_ops, dst_ops)                \
  84                         ((pef & RIO_PEF_INB_MBOX) &&            \
  85                          (pef & RIO_PEF_INB_DOORBELL) &&        \
  86                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  87                          (dst_ops & RIO_DST_OPS_DOORBELL))
  88 #define dev_rionet_capable(dev) \
  89         is_rionet_capable(dev->pef, dev->src_ops, dev->dst_ops)
  90
  91 #define RIONET_MAC_MATCH(x)     (*(u32 *)x == 0x00010001)
  92 #define RIONET_GET_DESTID(x)    (*(u16 *)(x + 4))
  93
  94 static struct net_device_stats *rionet_stats(struct net_device *ndev)
  95 {
  96         struct rionet_private *rnet = ndev->priv;
  97         return &rnet->stats;
  98 }
  99
 100 static int rionet_rx_clean(struct net_device *ndev)
 101 {
 102         int i;
 103         int error = 0;
 104         struct rionet_private *rnet = ndev->priv;
 105         void *data;
 106
 107         i = rnet->rx_slot;
 108
 109         do {
 110                 if (!rnet->rx_skb[i])
 111                         continue;
 112
 113                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 114                         break;
 115
 116                 rnet->rx_skb[i]->data = data;
 117                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 118                 rnet->rx_skb[i]->protocol =
 119                     eth_type_trans(rnet->rx_skb[i], ndev);
 120                 error = netif_rx(rnet->rx_skb[i]);
 121
 122                 if (error == NET_RX_DROP) {
 123                         rnet->stats.rx_dropped++;
 124                 } else if (error == NET_RX_BAD) {
 125                         if (netif_msg_rx_err(rnet))
 126                                 printk(KERN_WARNING "%s: bad rx packet\n",
 127                                        DRV_NAME);
 128                         rnet->stats.rx_errors++;
 129                 } else {
 130                         rnet->stats.rx_packets++;
 131                         rnet->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 132                 }
 133
 134         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 135
 136         return i;
 137 }
 138
 139 static void rionet_rx_fill(struct net_device *ndev, int end)
 140 {
 141         int i;
 142         struct rionet_private *rnet = ndev->priv;
 143
 144         i = rnet->rx_slot;
 145         do {
 146                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 147
 148                 if (!rnet->rx_skb[i])
 149                         break;
 150
 151                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 152                                    rnet->rx_skb[i]->data);
 153         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 154
 155         rnet->rx_slot = i;
 156 }
 157
 158 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 159                                struct rio_dev *rdev)
 160 {
 161         struct rionet_private *rnet = ndev->priv;
 162
 163         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 164         rnet->tx_skb[rnet->tx_slot] = skb;
 165
 166         rnet->stats.tx_packets++;
 167         rnet->stats.tx_bytes += skb->len;
 168
 169         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 170                 netif_stop_queue(ndev);
 171
 172         ++rnet->tx_slot;
 173         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 174
 175         if (netif_msg_tx_queued(rnet))
 176                 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
 177                        (u32) skb, skb->len);
 178
 179         return 0;
 180 }
 181
 182 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 183 {
 184         int i;
 185         struct rionet_private *rnet = ndev->priv;
 186         struct ethhdr *eth = (struct ethhdr *)skb->data;
 187         u16 destid;
 188         unsigned long flags;
 189
 190         local_irq_save(flags);
 191         if (!spin_trylock(&rnet->tx_lock)) {
 192                 local_irq_restore(flags);
 193                 return NETDEV_TX_LOCKED;
 194         }
 195
 196         if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
 197                 netif_stop_queue(ndev);
 198                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 199                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 200                        ndev->name);
 201                 return NETDEV_TX_BUSY;
 202         }
 203
 204         if (eth->h_dest[0] & 0x01) {
 205                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++)
 206                         if (rionet_active[i])
 207                                 rionet_queue_tx_msg(skb, ndev,
 208                                                     rionet_active[i]);
 209         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 210                 destid = RIONET_GET_DESTID(eth->h_dest);
 211                 if (rionet_active[destid])
 212                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
 213         }
 214
 215         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 216
 217         return 0;
 218 }
 219
 220 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 221                                u16 info)
 222 {
 223         struct net_device *ndev = dev_id;
 224         struct rionet_private *rnet = ndev->priv;
 225         struct rionet_peer *peer;
 226
 227         if (netif_msg_intr(rnet))
 228                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 229                        DRV_NAME, sid, tid, info);
 230         if (info == RIONET_DOORBELL_JOIN) {
 231                 if (!rionet_active[sid]) {
 232                         list_for_each_entry(peer, &rionet_peers, node) {
 233                                 if (peer->rdev->destid == sid)
 234                                         rionet_active[sid] = peer->rdev;
 235                         }
 236                         rio_mport_send_doorbell(mport, sid,
 237                                                 RIONET_DOORBELL_JOIN);
 238                 }
 239         } else if (info == RIONET_DOORBELL_LEAVE) {
 240                 rionet_active[sid] = NULL;
 241         } else {
 242                 if (netif_msg_intr(rnet))
 243                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 244                                DRV_NAME);
 245         }
 246 }
 247
 248 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 249 {
 250         int n;
 251         struct net_device *ndev = dev_id;
 252         struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
 253
 254         if (netif_msg_intr(rnet))
 255                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 256                        DRV_NAME, mbox, slot);
 257
 258         spin_lock(&rnet->lock);
 259         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 260                 rionet_rx_fill(ndev, n);
 261         spin_unlock(&rnet->lock);
 262 }
 263
 264 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 265 {
 266         struct net_device *ndev = dev_id;
 267         struct rionet_private *rnet = ndev->priv;
 268
 269         spin_lock(&rnet->lock);
 270
 271         if (netif_msg_intr(rnet))
 272                 printk(KERN_INFO
 273                        "%s: outbound message event, mbox %d slot %d\n",
 274                        DRV_NAME, mbox, slot);
 275
 276         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 277                 /* dma unmap single */
 278                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 279                 rnet->tx_skb[rnet->ack_slot] = NULL;
 280                 ++rnet->ack_slot;
 281                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 282                 rnet->tx_cnt--;
 283         }
 284
 285         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 286                 netif_wake_queue(ndev);
 287
 288         spin_unlock(&rnet->lock);
 289 }
 290
 291 static int rionet_open(struct net_device *ndev)
 292 {
 293         int i, rc = 0;
 294         struct rionet_peer *peer, *tmp;
 295         u32 pwdcsr;
 296         struct rionet_private *rnet = ndev->priv;
 297
 298         if (netif_msg_ifup(rnet))
 299                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 300
 301         if ((rc = rio_request_inb_dbell(rnet->mport,
 302                                         (void *)ndev,
 303                                         RIONET_DOORBELL_JOIN,
 304                                         RIONET_DOORBELL_LEAVE,
 305                                         rionet_dbell_event)) < 0)
 306                 goto out;
 307
 308         if ((rc = rio_request_inb_mbox(rnet->mport,
 309                                        (void *)ndev,
 310                                        RIONET_MAILBOX,
 311                                        RIONET_RX_RING_SIZE,
 312                                        rionet_inb_msg_event)) < 0)
 313                 goto out;
 314
 315         if ((rc = rio_request_outb_mbox(rnet->mport,
 316                                         (void *)ndev,
 317                                         RIONET_MAILBOX,
 318                                         RIONET_TX_RING_SIZE,
 319                                         rionet_outb_msg_event)) < 0)
 320                 goto out;
 321
 322         /* Initialize inbound message ring */
 323         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 324                 rnet->rx_skb[i] = NULL;
 325         rnet->rx_slot = 0;
 326         rionet_rx_fill(ndev, 0);
 327
 328         rnet->tx_slot = 0;
 329         rnet->tx_cnt = 0;
 330         rnet->ack_slot = 0;
 331
 332         netif_carrier_on(ndev);
 333         netif_start_queue(ndev);
 334
 335         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 336                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 337                                                          RIONET_DOORBELL_JOIN,
 338                                                          RIONET_DOORBELL_LEAVE)))
 339                 {
 340                         printk(KERN_ERR "%s: error requesting doorbells\n",
 341                                DRV_NAME);
 342                         continue;
 343                 }
 344
 345                 /*
 346                  * If device has initialized inbound doorbells,
 347                  * send a join message
 348                  */
 349                 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
 350                 if (pwdcsr & RIO_DOORBELL_AVAIL)
 351                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 352         }
 353
 354       out:
 355         return rc;
 356 }
 357
 358 static int rionet_close(struct net_device *ndev)
 359 {
 360         struct rionet_private *rnet = (struct rionet_private *)ndev->priv;
 361         struct rionet_peer *peer, *tmp;
 362         int i;
 363
 364         if (netif_msg_ifup(rnet))
 365                 printk(KERN_INFO "%s: close\n", DRV_NAME);
 366
 367         netif_stop_queue(ndev);
 368         netif_carrier_off(ndev);
 369
 370         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 371                 if (rnet->rx_skb[i])
 372                         kfree_skb(rnet->rx_skb[i]);
 373
 374         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 375                 if (rionet_active[peer->rdev->destid]) {
 376                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 377                         rionet_active[peer->rdev->destid] = NULL;
 378                 }
 379                 rio_release_outb_dbell(peer->rdev, peer->res);
 380         }
 381
 382         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 383                               RIONET_DOORBELL_LEAVE);
 384         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 385         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 386
 387         return 0;
 388 }
 389
 390 static void rionet_remove(struct rio_dev *rdev)
 391 {
 392         struct net_device *ndev = NULL;
 393         struct rionet_peer *peer, *tmp;
 394
 395         unregister_netdev(ndev);
 396         kfree(ndev);
 397
 398         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 399                 list_del(&peer->node);
 400                 kfree(peer);
 401         }
 402 }
 403
 404 static void rionet_get_drvinfo(struct net_device *ndev,
 405                                struct ethtool_drvinfo *info)
 406 {
 407         struct rionet_private *rnet = ndev->priv;
 408
 409         strcpy(info->driver, DRV_NAME);
 410         strcpy(info->version, DRV_VERSION);
 411         strcpy(info->fw_version, "n/a");
 412         strcpy(info->bus_info, rnet->mport->name);
 413 }
 414
 415 static u32 rionet_get_msglevel(struct net_device *ndev)
 416 {
 417         struct rionet_private *rnet = ndev->priv;
 418
 419         return rnet->msg_enable;
 420 }
 421
 422 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 423 {
 424         struct rionet_private *rnet = ndev->priv;
 425
 426         rnet->msg_enable = value;
 427 }
 428
 429 static const struct ethtool_ops rionet_ethtool_ops = {
 430         .get_drvinfo = rionet_get_drvinfo,
 431         .get_msglevel = rionet_get_msglevel,
 432         .set_msglevel = rionet_set_msglevel,
 433         .get_link = ethtool_op_get_link,
 434 };
 435
 436 static int rionet_setup_netdev(struct rio_mport *mport)
 437 {
 438         int rc = 0;
 439         struct net_device *ndev = NULL;
 440         struct rionet_private *rnet;
 441         u16 device_id;
 442
 443         /* Allocate our net_device structure */
 444         ndev = alloc_etherdev(sizeof(struct rionet_private));
 445         if (ndev == NULL) {
 446                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
 447                        DRV_NAME);
 448                 rc = -ENOMEM;
 449                 goto out;
 450         }
 451
 452         /* Set up private area */
 453         rnet = (struct rionet_private *)ndev->priv;
 454         rnet->mport = mport;
 455
 456         /* Set the default MAC address */
 457         device_id = rio_local_get_device_id(mport);
 458         ndev->dev_addr[0] = 0x00;
 459         ndev->dev_addr[1] = 0x01;
 460         ndev->dev_addr[2] = 0x00;
 461         ndev->dev_addr[3] = 0x01;
 462         ndev->dev_addr[4] = device_id >> 8;
 463         ndev->dev_addr[5] = device_id & 0xff;
 464
 465         /* Fill in the driver function table */
 466         ndev->open = &rionet_open;
 467         ndev->hard_start_xmit = &rionet_start_xmit;
 468         ndev->stop = &rionet_close;
 469         ndev->get_stats = &rionet_stats;
 470         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 471         ndev->features = NETIF_F_LLTX;
 472         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 473
 474         SET_MODULE_OWNER(ndev);
 475
 476         spin_lock_init(&rnet->lock);
 477         spin_lock_init(&rnet->tx_lock);
 478
 479         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 480
 481         rc = register_netdev(ndev);
 482         if (rc != 0)
 483                 goto out;
 484
 485         printk("%s: %s %s Version %s, MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
 486                ndev->name,
 487                DRV_NAME,
 488                DRV_DESC,
 489                DRV_VERSION,
 490                ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
 491                ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
 492
 493       out:
 494         return rc;
 495 }
 496
 497 /*
 498  * XXX Make multi-net safe
 499  */
 500 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 501 {
 502         int rc = -ENODEV;
 503         u32 lpef, lsrc_ops, ldst_ops;
 504         struct rionet_peer *peer;
 505
 506         /* If local device is not rionet capable, give up quickly */
 507         if (!rionet_capable)
 508                 goto out;
 509
 510         /*
 511          * First time through, make sure local device is rionet
 512          * capable, setup netdev,  and set flags so this is skipped
 513          * on later probes
 514          */
 515         if (!rionet_check) {
 516                 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef);
 517                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 518                                          &lsrc_ops);
 519                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 520                                          &ldst_ops);
 521                 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) {
 522                         printk(KERN_ERR
 523                                "%s: local device is not network capable\n",
 524                                DRV_NAME);
 525                         rionet_check = 1;
 526                         rionet_capable = 0;
 527                         goto out;
 528                 }
 529
 530                 rc = rionet_setup_netdev(rdev->net->hport);
 531                 rionet_check = 1;
 532         }
 533
 534         /*
 535          * If the remote device has mailbox/doorbell capabilities,
 536          * add it to the peer list.
 537          */
 538         if (dev_rionet_capable(rdev)) {
 539                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 540                         rc = -ENOMEM;
 541                         goto out;
 542                 }
 543                 peer->rdev = rdev;
 544                 list_add_tail(&peer->node, &rionet_peers);
 545         }
 546
 547       out:
 548         return rc;
 549 }
 550
 551 static struct rio_device_id rionet_id_table[] = {
 552         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
 553 };
 554
 555 static struct rio_driver rionet_driver = {
 556         .name = "rionet",
 557         .id_table = rionet_id_table,
 558         .probe = rionet_probe,
 559         .remove = rionet_remove,
 560 };
 561
 562 static int __init rionet_init(void)
 563 {
 564         return rio_register_driver(&rionet_driver);
 565 }
 566
 567 static void __exit rionet_exit(void)
 568 {
 569         rio_unregister_driver(&rionet_driver);
 570 }
 571
 572 module_init(rionet_init);
 573 module_exit(rionet_exit);