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/slab.h>
  20 #include <linux/rio_ids.h>
  21
  22 #include <linux/netdevice.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/crc32.h>
  26 #include <linux/ethtool.h>
  27
  28 #define DRV_NAME        "rionet"
  29 #define DRV_VERSION     "0.2"
  30 #define DRV_AUTHOR      "Matt Porter <mporter@kernel.crashing.org>"
  31 #define DRV_DESC        "Ethernet over RapidIO"
  32
  33 MODULE_AUTHOR(DRV_AUTHOR);
  34 MODULE_DESCRIPTION(DRV_DESC);
  35 MODULE_LICENSE("GPL");
  36
  37 #define RIONET_DEFAULT_MSGLEVEL \
  38                         (NETIF_MSG_DRV          | \
  39                          NETIF_MSG_LINK         | \
  40                          NETIF_MSG_RX_ERR       | \
  41                          NETIF_MSG_TX_ERR)
  42
  43 #define RIONET_DOORBELL_JOIN    0x1000
  44 #define RIONET_DOORBELL_LEAVE   0x1001
  45
  46 #define RIONET_MAILBOX          0
  47
  48 #define RIONET_TX_RING_SIZE     CONFIG_RIONET_TX_SIZE
  49 #define RIONET_RX_RING_SIZE     CONFIG_RIONET_RX_SIZE
  50
  51 static LIST_HEAD(rionet_peers);
  52
  53 struct rionet_private {
  54         struct rio_mport *mport;
  55         struct sk_buff *rx_skb[RIONET_RX_RING_SIZE];
  56         struct sk_buff *tx_skb[RIONET_TX_RING_SIZE];
  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 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;
  82
  83 #define is_rionet_capable(src_ops, dst_ops)                     \
  84                         ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  85                          (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  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->src_ops, dev->dst_ops)
  90
  91 #define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  92 #define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  93
  94 static int rionet_rx_clean(struct net_device *ndev)
  95 {
  96         int i;
  97         int error = 0;
  98         struct rionet_private *rnet = netdev_priv(ndev);
  99         void *data;
 100
 101         i = rnet->rx_slot;
 102
 103         do {
 104                 if (!rnet->rx_skb[i])
 105                         continue;
 106
 107                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 108                         break;
 109
 110                 rnet->rx_skb[i]->data = data;
 111                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 112                 rnet->rx_skb[i]->protocol =
 113                     eth_type_trans(rnet->rx_skb[i], ndev);
 114                 error = netif_rx(rnet->rx_skb[i]);
 115
 116                 if (error == NET_RX_DROP) {
 117                         ndev->stats.rx_dropped++;
 118                 } else {
 119                         ndev->stats.rx_packets++;
 120                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 121                 }
 122
 123         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 124
 125         return i;
 126 }
 127
 128 static void rionet_rx_fill(struct net_device *ndev, int end)
 129 {
 130         int i;
 131         struct rionet_private *rnet = netdev_priv(ndev);
 132
 133         i = rnet->rx_slot;
 134         do {
 135                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 136
 137                 if (!rnet->rx_skb[i])
 138                         break;
 139
 140                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 141                                    rnet->rx_skb[i]->data);
 142         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 143
 144         rnet->rx_slot = i;
 145 }
 146
 147 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 148                                struct rio_dev *rdev)
 149 {
 150         struct rionet_private *rnet = netdev_priv(ndev);
 151
 152         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 153         rnet->tx_skb[rnet->tx_slot] = skb;
 154
 155         ndev->stats.tx_packets++;
 156         ndev->stats.tx_bytes += skb->len;
 157
 158         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 159                 netif_stop_queue(ndev);
 160
 161         ++rnet->tx_slot;
 162         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 163
 164         if (netif_msg_tx_queued(rnet))
 165                 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 166                        skb->len);
 167
 168         return 0;
 169 }
 170
 171 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 172 {
 173         int i;
 174         struct rionet_private *rnet = netdev_priv(ndev);
 175         struct ethhdr *eth = (struct ethhdr *)skb->data;
 176         u16 destid;
 177         unsigned long flags;
 178
 179         local_irq_save(flags);
 180         if (!spin_trylock(&rnet->tx_lock)) {
 181                 local_irq_restore(flags);
 182                 return NETDEV_TX_LOCKED;
 183         }
 184
 185         if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
 186                 netif_stop_queue(ndev);
 187                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 188                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 189                        ndev->name);
 190                 return NETDEV_TX_BUSY;
 191         }
 192
 193         if (eth->h_dest[0] & 0x01) {
 194                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 195                                 i++)
 196                         if (rionet_active[i])
 197                                 rionet_queue_tx_msg(skb, ndev,
 198                                                     rionet_active[i]);
 199         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 200                 destid = RIONET_GET_DESTID(eth->h_dest);
 201                 if (rionet_active[destid])
 202                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
 203         }
 204
 205         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 206
 207         return NETDEV_TX_OK;
 208 }
 209
 210 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 211                                u16 info)
 212 {
 213         struct net_device *ndev = dev_id;
 214         struct rionet_private *rnet = netdev_priv(ndev);
 215         struct rionet_peer *peer;
 216
 217         if (netif_msg_intr(rnet))
 218                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 219                        DRV_NAME, sid, tid, info);
 220         if (info == RIONET_DOORBELL_JOIN) {
 221                 if (!rionet_active[sid]) {
 222                         list_for_each_entry(peer, &rionet_peers, node) {
 223                                 if (peer->rdev->destid == sid)
 224                                         rionet_active[sid] = peer->rdev;
 225                         }
 226                         rio_mport_send_doorbell(mport, sid,
 227                                                 RIONET_DOORBELL_JOIN);
 228                 }
 229         } else if (info == RIONET_DOORBELL_LEAVE) {
 230                 rionet_active[sid] = NULL;
 231         } else {
 232                 if (netif_msg_intr(rnet))
 233                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 234                                DRV_NAME);
 235         }
 236 }
 237
 238 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 239 {
 240         int n;
 241         struct net_device *ndev = dev_id;
 242         struct rionet_private *rnet = netdev_priv(ndev);
 243
 244         if (netif_msg_intr(rnet))
 245                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 246                        DRV_NAME, mbox, slot);
 247
 248         spin_lock(&rnet->lock);
 249         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 250                 rionet_rx_fill(ndev, n);
 251         spin_unlock(&rnet->lock);
 252 }
 253
 254 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 255 {
 256         struct net_device *ndev = dev_id;
 257         struct rionet_private *rnet = netdev_priv(ndev);
 258
 259         spin_lock(&rnet->lock);
 260
 261         if (netif_msg_intr(rnet))
 262                 printk(KERN_INFO
 263                        "%s: outbound message event, mbox %d slot %d\n",
 264                        DRV_NAME, mbox, slot);
 265
 266         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 267                 /* dma unmap single */
 268                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 269                 rnet->tx_skb[rnet->ack_slot] = NULL;
 270                 ++rnet->ack_slot;
 271                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 272                 rnet->tx_cnt--;
 273         }
 274
 275         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 276                 netif_wake_queue(ndev);
 277
 278         spin_unlock(&rnet->lock);
 279 }
 280
 281 static int rionet_open(struct net_device *ndev)
 282 {
 283         int i, rc = 0;
 284         struct rionet_peer *peer, *tmp;
 285         struct rionet_private *rnet = netdev_priv(ndev);
 286
 287         if (netif_msg_ifup(rnet))
 288                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 289
 290         if ((rc = rio_request_inb_dbell(rnet->mport,
 291                                         (void *)ndev,
 292                                         RIONET_DOORBELL_JOIN,
 293                                         RIONET_DOORBELL_LEAVE,
 294                                         rionet_dbell_event)) < 0)
 295                 goto out;
 296
 297         if ((rc = rio_request_inb_mbox(rnet->mport,
 298                                        (void *)ndev,
 299                                        RIONET_MAILBOX,
 300                                        RIONET_RX_RING_SIZE,
 301                                        rionet_inb_msg_event)) < 0)
 302                 goto out;
 303
 304         if ((rc = rio_request_outb_mbox(rnet->mport,
 305                                         (void *)ndev,
 306                                         RIONET_MAILBOX,
 307                                         RIONET_TX_RING_SIZE,
 308                                         rionet_outb_msg_event)) < 0)
 309                 goto out;
 310
 311         /* Initialize inbound message ring */
 312         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 313                 rnet->rx_skb[i] = NULL;
 314         rnet->rx_slot = 0;
 315         rionet_rx_fill(ndev, 0);
 316
 317         rnet->tx_slot = 0;
 318         rnet->tx_cnt = 0;
 319         rnet->ack_slot = 0;
 320
 321         netif_carrier_on(ndev);
 322         netif_start_queue(ndev);
 323
 324         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 325                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 326                                                          RIONET_DOORBELL_JOIN,
 327                                                          RIONET_DOORBELL_LEAVE)))
 328                 {
 329                         printk(KERN_ERR "%s: error requesting doorbells\n",
 330                                DRV_NAME);
 331                         continue;
 332                 }
 333
 334                 /* Send a join message */
 335                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 336         }
 337
 338       out:
 339         return rc;
 340 }
 341
 342 static int rionet_close(struct net_device *ndev)
 343 {
 344         struct rionet_private *rnet = netdev_priv(ndev);
 345         struct rionet_peer *peer, *tmp;
 346         int i;
 347
 348         if (netif_msg_ifup(rnet))
 349                 printk(KERN_INFO "%s: close\n", DRV_NAME);
 350
 351         netif_stop_queue(ndev);
 352         netif_carrier_off(ndev);
 353
 354         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 355                 kfree_skb(rnet->rx_skb[i]);
 356
 357         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 358                 if (rionet_active[peer->rdev->destid]) {
 359                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 360                         rionet_active[peer->rdev->destid] = NULL;
 361                 }
 362                 rio_release_outb_dbell(peer->rdev, peer->res);
 363         }
 364
 365         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 366                               RIONET_DOORBELL_LEAVE);
 367         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 368         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 369
 370         return 0;
 371 }
 372
 373 static void rionet_remove(struct rio_dev *rdev)
 374 {
 375         struct net_device *ndev = rio_get_drvdata(rdev);
 376         struct rionet_peer *peer, *tmp;
 377
 378         free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
 379                                         __fls(sizeof(void *)) + 4 : 0);
 380         unregister_netdev(ndev);
 381         free_netdev(ndev);
 382
 383         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 384                 list_del(&peer->node);
 385                 kfree(peer);
 386         }
 387 }
 388
 389 static void rionet_get_drvinfo(struct net_device *ndev,
 390                                struct ethtool_drvinfo *info)
 391 {
 392         struct rionet_private *rnet = netdev_priv(ndev);
 393
 394         strcpy(info->driver, DRV_NAME);
 395         strcpy(info->version, DRV_VERSION);
 396         strcpy(info->fw_version, "n/a");
 397         strcpy(info->bus_info, rnet->mport->name);
 398 }
 399
 400 static u32 rionet_get_msglevel(struct net_device *ndev)
 401 {
 402         struct rionet_private *rnet = netdev_priv(ndev);
 403
 404         return rnet->msg_enable;
 405 }
 406
 407 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 408 {
 409         struct rionet_private *rnet = netdev_priv(ndev);
 410
 411         rnet->msg_enable = value;
 412 }
 413
 414 static const struct ethtool_ops rionet_ethtool_ops = {
 415         .get_drvinfo = rionet_get_drvinfo,
 416         .get_msglevel = rionet_get_msglevel,
 417         .set_msglevel = rionet_set_msglevel,
 418         .get_link = ethtool_op_get_link,
 419 };
 420
 421 static const struct net_device_ops rionet_netdev_ops = {
 422         .ndo_open               = rionet_open,
 423         .ndo_stop               = rionet_close,
 424         .ndo_start_xmit         = rionet_start_xmit,
 425         .ndo_change_mtu         = eth_change_mtu,
 426         .ndo_validate_addr      = eth_validate_addr,
 427         .ndo_set_mac_address    = eth_mac_addr,
 428 };
 429
 430 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 431 {
 432         int rc = 0;
 433         struct rionet_private *rnet;
 434         u16 device_id;
 435
 436         rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 437                         mport->sys_size ? __fls(sizeof(void *)) + 4 : 0);
 438         if (!rionet_active) {
 439                 rc = -ENOMEM;
 440                 goto out;
 441         }
 442         memset((void *)rionet_active, 0, sizeof(void *) *
 443                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
 444
 445         /* Set up private area */
 446         rnet = netdev_priv(ndev);
 447         rnet->mport = mport;
 448
 449         /* Set the default MAC address */
 450         device_id = rio_local_get_device_id(mport);
 451         ndev->dev_addr[0] = 0x00;
 452         ndev->dev_addr[1] = 0x01;
 453         ndev->dev_addr[2] = 0x00;
 454         ndev->dev_addr[3] = 0x01;
 455         ndev->dev_addr[4] = device_id >> 8;
 456         ndev->dev_addr[5] = device_id & 0xff;
 457
 458         ndev->netdev_ops = &rionet_netdev_ops;
 459         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 460         ndev->features = NETIF_F_LLTX;
 461         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 462
 463         spin_lock_init(&rnet->lock);
 464         spin_lock_init(&rnet->tx_lock);
 465
 466         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 467
 468         rc = register_netdev(ndev);
 469         if (rc != 0)
 470                 goto out;
 471
 472         printk("%s: %s %s Version %s, MAC %pM\n",
 473                ndev->name,
 474                DRV_NAME,
 475                DRV_DESC,
 476                DRV_VERSION,
 477                ndev->dev_addr);
 478
 479       out:
 480         return rc;
 481 }
 482
 483 /*
 484  * XXX Make multi-net safe
 485  */
 486 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 487 {
 488         int rc = -ENODEV;
 489         u32 lsrc_ops, ldst_ops;
 490         struct rionet_peer *peer;
 491         struct net_device *ndev = NULL;
 492
 493         /* If local device is not rionet capable, give up quickly */
 494         if (!rionet_capable)
 495                 goto out;
 496
 497         /* Allocate our net_device structure */
 498         ndev = alloc_etherdev(sizeof(struct rionet_private));
 499         if (ndev == NULL) {
 500                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
 501                        DRV_NAME);
 502                 rc = -ENOMEM;
 503                 goto out;
 504         }
 505
 506         /*
 507          * First time through, make sure local device is rionet
 508          * capable, setup netdev,  and set flags so this is skipped
 509          * on later probes
 510          */
 511         if (!rionet_check) {
 512                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 513                                          &lsrc_ops);
 514                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 515                                          &ldst_ops);
 516                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 517                         printk(KERN_ERR
 518                                "%s: local device is not network capable\n",
 519                                DRV_NAME);
 520                         rionet_check = 1;
 521                         rionet_capable = 0;
 522                         goto out;
 523                 }
 524
 525                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 526                 rionet_check = 1;
 527         }
 528
 529         /*
 530          * If the remote device has mailbox/doorbell capabilities,
 531          * add it to the peer list.
 532          */
 533         if (dev_rionet_capable(rdev)) {
 534                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 535                         rc = -ENOMEM;
 536                         goto out;
 537                 }
 538                 peer->rdev = rdev;
 539                 list_add_tail(&peer->node, &rionet_peers);
 540         }
 541
 542         rio_set_drvdata(rdev, ndev);
 543
 544       out:
 545         return rc;
 546 }
 547
 548 static struct rio_device_id rionet_id_table[] = {
 549         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
 550 };
 551
 552 static struct rio_driver rionet_driver = {
 553         .name = "rionet",
 554         .id_table = rionet_id_table,
 555         .probe = rionet_probe,
 556         .remove = rionet_remove,
 557 };
 558
 559 static int __init rionet_init(void)
 560 {
 561         return rio_register_driver(&rionet_driver);
 562 }
 563
 564 static void __exit rionet_exit(void)
 565 {
 566         rio_unregister_driver(&rionet_driver);
 567 }
 568
 569 late_initcall(rionet_init);
 570 module_exit(rionet_exit);