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