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