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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;
  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 = netdev_priv(ndev);
  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 = netdev_priv(ndev);
 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 = netdev_priv(ndev);
 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 = netdev_priv(ndev);
 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(rnet->mport->sys_size);
 199                                 i++)
 200                         if (rionet_active[i])
 201                                 rionet_queue_tx_msg(skb, ndev,
 202                                                     rionet_active[i]);
 203         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 204                 destid = RIONET_GET_DESTID(eth->h_dest);
 205                 if (rionet_active[destid])
 206                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
 207         }
 208
 209         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 210
 211         return 0;
 212 }
 213
 214 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 215                                u16 info)
 216 {
 217         struct net_device *ndev = dev_id;
 218         struct rionet_private *rnet = netdev_priv(ndev);
 219         struct rionet_peer *peer;
 220
 221         if (netif_msg_intr(rnet))
 222                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 223                        DRV_NAME, sid, tid, info);
 224         if (info == RIONET_DOORBELL_JOIN) {
 225                 if (!rionet_active[sid]) {
 226                         list_for_each_entry(peer, &rionet_peers, node) {
 227                                 if (peer->rdev->destid == sid)
 228                                         rionet_active[sid] = peer->rdev;
 229                         }
 230                         rio_mport_send_doorbell(mport, sid,
 231                                                 RIONET_DOORBELL_JOIN);
 232                 }
 233         } else if (info == RIONET_DOORBELL_LEAVE) {
 234                 rionet_active[sid] = NULL;
 235         } else {
 236                 if (netif_msg_intr(rnet))
 237                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 238                                DRV_NAME);
 239         }
 240 }
 241
 242 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 243 {
 244         int n;
 245         struct net_device *ndev = dev_id;
 246         struct rionet_private *rnet = netdev_priv(ndev);
 247
 248         if (netif_msg_intr(rnet))
 249                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 250                        DRV_NAME, mbox, slot);
 251
 252         spin_lock(&rnet->lock);
 253         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 254                 rionet_rx_fill(ndev, n);
 255         spin_unlock(&rnet->lock);
 256 }
 257
 258 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 259 {
 260         struct net_device *ndev = dev_id;
 261         struct rionet_private *rnet = netdev_priv(ndev);
 262
 263         spin_lock(&rnet->lock);
 264
 265         if (netif_msg_intr(rnet))
 266                 printk(KERN_INFO
 267                        "%s: outbound message event, mbox %d slot %d\n",
 268                        DRV_NAME, mbox, slot);
 269
 270         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 271                 /* dma unmap single */
 272                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 273                 rnet->tx_skb[rnet->ack_slot] = NULL;
 274                 ++rnet->ack_slot;
 275                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 276                 rnet->tx_cnt--;
 277         }
 278
 279         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 280                 netif_wake_queue(ndev);
 281
 282         spin_unlock(&rnet->lock);
 283 }
 284
 285 static int rionet_open(struct net_device *ndev)
 286 {
 287         int i, rc = 0;
 288         struct rionet_peer *peer, *tmp;
 289         u32 pwdcsr;
 290         struct rionet_private *rnet = netdev_priv(ndev);
 291
 292         if (netif_msg_ifup(rnet))
 293                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 294
 295         if ((rc = rio_request_inb_dbell(rnet->mport,
 296                                         (void *)ndev,
 297                                         RIONET_DOORBELL_JOIN,
 298                                         RIONET_DOORBELL_LEAVE,
 299                                         rionet_dbell_event)) < 0)
 300                 goto out;
 301
 302         if ((rc = rio_request_inb_mbox(rnet->mport,
 303                                        (void *)ndev,
 304                                        RIONET_MAILBOX,
 305                                        RIONET_RX_RING_SIZE,
 306                                        rionet_inb_msg_event)) < 0)
 307                 goto out;
 308
 309         if ((rc = rio_request_outb_mbox(rnet->mport,
 310                                         (void *)ndev,
 311                                         RIONET_MAILBOX,
 312                                         RIONET_TX_RING_SIZE,
 313                                         rionet_outb_msg_event)) < 0)
 314                 goto out;
 315
 316         /* Initialize inbound message ring */
 317         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 318                 rnet->rx_skb[i] = NULL;
 319         rnet->rx_slot = 0;
 320         rionet_rx_fill(ndev, 0);
 321
 322         rnet->tx_slot = 0;
 323         rnet->tx_cnt = 0;
 324         rnet->ack_slot = 0;
 325
 326         netif_carrier_on(ndev);
 327         netif_start_queue(ndev);
 328
 329         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 330                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 331                                                          RIONET_DOORBELL_JOIN,
 332                                                          RIONET_DOORBELL_LEAVE)))
 333                 {
 334                         printk(KERN_ERR "%s: error requesting doorbells\n",
 335                                DRV_NAME);
 336                         continue;
 337                 }
 338
 339                 /*
 340                  * If device has initialized inbound doorbells,
 341                  * send a join message
 342                  */
 343                 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
 344                 if (pwdcsr & RIO_DOORBELL_AVAIL)
 345                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 346         }
 347
 348       out:
 349         return rc;
 350 }
 351
 352 static int rionet_close(struct net_device *ndev)
 353 {
 354         struct rionet_private *rnet = netdev_priv(ndev);
 355         struct rionet_peer *peer, *tmp;
 356         int i;
 357
 358         if (netif_msg_ifup(rnet))
 359                 printk(KERN_INFO "%s: close\n", DRV_NAME);
 360
 361         netif_stop_queue(ndev);
 362         netif_carrier_off(ndev);
 363
 364         for (i = 0; i < RIONET_RX_RING_SIZE; 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         free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
 389                                         __ilog2(sizeof(void *)) + 4 : 0);
 390         unregister_netdev(ndev);
 391         kfree(ndev);
 392
 393         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 394                 list_del(&peer->node);
 395                 kfree(peer);
 396         }
 397 }
 398
 399 static void rionet_get_drvinfo(struct net_device *ndev,
 400                                struct ethtool_drvinfo *info)
 401 {
 402         struct rionet_private *rnet = netdev_priv(ndev);
 403
 404         strcpy(info->driver, DRV_NAME);
 405         strcpy(info->version, DRV_VERSION);
 406         strcpy(info->fw_version, "n/a");
 407         strcpy(info->bus_info, rnet->mport->name);
 408 }
 409
 410 static u32 rionet_get_msglevel(struct net_device *ndev)
 411 {
 412         struct rionet_private *rnet = netdev_priv(ndev);
 413
 414         return rnet->msg_enable;
 415 }
 416
 417 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 418 {
 419         struct rionet_private *rnet = netdev_priv(ndev);
 420
 421         rnet->msg_enable = value;
 422 }
 423
 424 static const struct ethtool_ops rionet_ethtool_ops = {
 425         .get_drvinfo = rionet_get_drvinfo,
 426         .get_msglevel = rionet_get_msglevel,
 427         .set_msglevel = rionet_set_msglevel,
 428         .get_link = ethtool_op_get_link,
 429 };
 430
 431 static int rionet_setup_netdev(struct rio_mport *mport)
 432 {
 433         int rc = 0;
 434         struct net_device *ndev = NULL;
 435         struct rionet_private *rnet;
 436         u16 device_id;
 437
 438         /* Allocate our net_device structure */
 439         ndev = alloc_etherdev(sizeof(struct rionet_private));
 440         if (ndev == NULL) {
 441                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
 442                        DRV_NAME);
 443                 rc = -ENOMEM;
 444                 goto out;
 445         }
 446
 447         rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 448                         mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
 449         if (!rionet_active) {
 450                 rc = -ENOMEM;
 451                 goto out;
 452         }
 453         memset((void *)rionet_active, 0, sizeof(void *) *
 454                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
 455
 456         /* Set up private area */
 457         rnet = netdev_priv(ndev);
 458         rnet->mport = mport;
 459
 460         /* Set the default MAC address */
 461         device_id = rio_local_get_device_id(mport);
 462         ndev->dev_addr[0] = 0x00;
 463         ndev->dev_addr[1] = 0x01;
 464         ndev->dev_addr[2] = 0x00;
 465         ndev->dev_addr[3] = 0x01;
 466         ndev->dev_addr[4] = device_id >> 8;
 467         ndev->dev_addr[5] = device_id & 0xff;
 468
 469         /* Fill in the driver function table */
 470         ndev->open = &rionet_open;
 471         ndev->hard_start_xmit = &rionet_start_xmit;
 472         ndev->stop = &rionet_close;
 473         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 474         ndev->features = NETIF_F_LLTX;
 475         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 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 %pM\n",
 487                ndev->name,
 488                DRV_NAME,
 489                DRV_DESC,
 490                DRV_VERSION,
 491                ndev->dev_addr);
 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);