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         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 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 {
 118                         ndev->stats.rx_packets++;
 119                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 120                 }
 121
 122         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 123
 124         return i;
 125 }
 126
 127 static void rionet_rx_fill(struct net_device *ndev, int end)
 128 {
 129         int i;
 130         struct rionet_private *rnet = netdev_priv(ndev);
 131
 132         i = rnet->rx_slot;
 133         do {
 134                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 135
 136                 if (!rnet->rx_skb[i])
 137                         break;
 138
 139                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 140                                    rnet->rx_skb[i]->data);
 141         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 142
 143         rnet->rx_slot = i;
 144 }
 145
 146 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 147                                struct rio_dev *rdev)
 148 {
 149         struct rionet_private *rnet = netdev_priv(ndev);
 150
 151         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 152         rnet->tx_skb[rnet->tx_slot] = skb;
 153
 154         ndev->stats.tx_packets++;
 155         ndev->stats.tx_bytes += skb->len;
 156
 157         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 158                 netif_stop_queue(ndev);
 159
 160         ++rnet->tx_slot;
 161         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 162
 163         if (netif_msg_tx_queued(rnet))
 164                 printk(KERN_INFO "%s: queued skb %8.8x len %8.8x\n", DRV_NAME,
 165                        (u32) skb, skb->len);
 166
 167         return 0;
 168 }
 169
 170 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 171 {
 172         int i;
 173         struct rionet_private *rnet = netdev_priv(ndev);
 174         struct ethhdr *eth = (struct ethhdr *)skb->data;
 175         u16 destid;
 176         unsigned long flags;
 177
 178         local_irq_save(flags);
 179         if (!spin_trylock(&rnet->tx_lock)) {
 180                 local_irq_restore(flags);
 181                 return NETDEV_TX_LOCKED;
 182         }
 183
 184         if ((rnet->tx_cnt + 1) > RIONET_TX_RING_SIZE) {
 185                 netif_stop_queue(ndev);
 186                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 187                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 188                        ndev->name);
 189                 return NETDEV_TX_BUSY;
 190         }
 191
 192         if (eth->h_dest[0] & 0x01) {
 193                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 194                                 i++)
 195                         if (rionet_active[i])
 196                                 rionet_queue_tx_msg(skb, ndev,
 197                                                     rionet_active[i]);
 198         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 199                 destid = RIONET_GET_DESTID(eth->h_dest);
 200                 if (rionet_active[destid])
 201                         rionet_queue_tx_msg(skb, ndev, rionet_active[destid]);
 202         }
 203
 204         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 205
 206         return NETDEV_TX_OK;
 207 }
 208
 209 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 210                                u16 info)
 211 {
 212         struct net_device *ndev = dev_id;
 213         struct rionet_private *rnet = netdev_priv(ndev);
 214         struct rionet_peer *peer;
 215
 216         if (netif_msg_intr(rnet))
 217                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 218                        DRV_NAME, sid, tid, info);
 219         if (info == RIONET_DOORBELL_JOIN) {
 220                 if (!rionet_active[sid]) {
 221                         list_for_each_entry(peer, &rionet_peers, node) {
 222                                 if (peer->rdev->destid == sid)
 223                                         rionet_active[sid] = peer->rdev;
 224                         }
 225                         rio_mport_send_doorbell(mport, sid,
 226                                                 RIONET_DOORBELL_JOIN);
 227                 }
 228         } else if (info == RIONET_DOORBELL_LEAVE) {
 229                 rionet_active[sid] = NULL;
 230         } else {
 231                 if (netif_msg_intr(rnet))
 232                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 233                                DRV_NAME);
 234         }
 235 }
 236
 237 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 238 {
 239         int n;
 240         struct net_device *ndev = dev_id;
 241         struct rionet_private *rnet = netdev_priv(ndev);
 242
 243         if (netif_msg_intr(rnet))
 244                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 245                        DRV_NAME, mbox, slot);
 246
 247         spin_lock(&rnet->lock);
 248         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 249                 rionet_rx_fill(ndev, n);
 250         spin_unlock(&rnet->lock);
 251 }
 252
 253 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 254 {
 255         struct net_device *ndev = dev_id;
 256         struct rionet_private *rnet = netdev_priv(ndev);
 257
 258         spin_lock(&rnet->lock);
 259
 260         if (netif_msg_intr(rnet))
 261                 printk(KERN_INFO
 262                        "%s: outbound message event, mbox %d slot %d\n",
 263                        DRV_NAME, mbox, slot);
 264
 265         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 266                 /* dma unmap single */
 267                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 268                 rnet->tx_skb[rnet->ack_slot] = NULL;
 269                 ++rnet->ack_slot;
 270                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 271                 rnet->tx_cnt--;
 272         }
 273
 274         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 275                 netif_wake_queue(ndev);
 276
 277         spin_unlock(&rnet->lock);
 278 }
 279
 280 static int rionet_open(struct net_device *ndev)
 281 {
 282         int i, rc = 0;
 283         struct rionet_peer *peer, *tmp;
 284         u32 pwdcsr;
 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                 /*
 335                  * If device has initialized inbound doorbells,
 336                  * send a join message
 337                  */
 338                 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr);
 339                 if (pwdcsr & RIO_DOORBELL_AVAIL)
 340                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 341         }
 342
 343       out:
 344         return rc;
 345 }
 346
 347 static int rionet_close(struct net_device *ndev)
 348 {
 349         struct rionet_private *rnet = netdev_priv(ndev);
 350         struct rionet_peer *peer, *tmp;
 351         int i;
 352
 353         if (netif_msg_ifup(rnet))
 354                 printk(KERN_INFO "%s: close\n", DRV_NAME);
 355
 356         netif_stop_queue(ndev);
 357         netif_carrier_off(ndev);
 358
 359         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 360                 kfree_skb(rnet->rx_skb[i]);
 361
 362         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 363                 if (rionet_active[peer->rdev->destid]) {
 364                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 365                         rionet_active[peer->rdev->destid] = NULL;
 366                 }
 367                 rio_release_outb_dbell(peer->rdev, peer->res);
 368         }
 369
 370         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 371                               RIONET_DOORBELL_LEAVE);
 372         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 373         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 374
 375         return 0;
 376 }
 377
 378 static void rionet_remove(struct rio_dev *rdev)
 379 {
 380         struct net_device *ndev = NULL;
 381         struct rionet_peer *peer, *tmp;
 382
 383         free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ?
 384                                         __ilog2(sizeof(void *)) + 4 : 0);
 385         unregister_netdev(ndev);
 386         kfree(ndev);
 387
 388         list_for_each_entry_safe(peer, tmp, &rionet_peers, node) {
 389                 list_del(&peer->node);
 390                 kfree(peer);
 391         }
 392 }
 393
 394 static void rionet_get_drvinfo(struct net_device *ndev,
 395                                struct ethtool_drvinfo *info)
 396 {
 397         struct rionet_private *rnet = netdev_priv(ndev);
 398
 399         strcpy(info->driver, DRV_NAME);
 400         strcpy(info->version, DRV_VERSION);
 401         strcpy(info->fw_version, "n/a");
 402         strcpy(info->bus_info, rnet->mport->name);
 403 }
 404
 405 static u32 rionet_get_msglevel(struct net_device *ndev)
 406 {
 407         struct rionet_private *rnet = netdev_priv(ndev);
 408
 409         return rnet->msg_enable;
 410 }
 411
 412 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 413 {
 414         struct rionet_private *rnet = netdev_priv(ndev);
 415
 416         rnet->msg_enable = value;
 417 }
 418
 419 static const struct ethtool_ops rionet_ethtool_ops = {
 420         .get_drvinfo = rionet_get_drvinfo,
 421         .get_msglevel = rionet_get_msglevel,
 422         .set_msglevel = rionet_set_msglevel,
 423         .get_link = ethtool_op_get_link,
 424 };
 425
 426 static const struct net_device_ops rionet_netdev_ops = {
 427         .ndo_open               = rionet_open,
 428         .ndo_stop               = rionet_close,
 429         .ndo_start_xmit         = rionet_start_xmit,
 430         .ndo_change_mtu         = eth_change_mtu,
 431         .ndo_validate_addr      = eth_validate_addr,
 432         .ndo_set_mac_address    = eth_mac_addr,
 433 };
 434
 435 static int rionet_setup_netdev(struct rio_mport *mport)
 436 {
 437         int rc = 0;
 438         struct net_device *ndev = NULL;
 439         struct rionet_private *rnet;
 440         u16 device_id;
 441
 442         /* Allocate our net_device structure */
 443         ndev = alloc_etherdev(sizeof(struct rionet_private));
 444         if (ndev == NULL) {
 445                 printk(KERN_INFO "%s: could not allocate ethernet device.\n",
 446                        DRV_NAME);
 447                 rc = -ENOMEM;
 448                 goto out;
 449         }
 450
 451         rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 452                         mport->sys_size ? __ilog2(sizeof(void *)) + 4 : 0);
 453         if (!rionet_active) {
 454                 rc = -ENOMEM;
 455                 goto out;
 456         }
 457         memset((void *)rionet_active, 0, sizeof(void *) *
 458                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size));
 459
 460         /* Set up private area */
 461         rnet = netdev_priv(ndev);
 462         rnet->mport = mport;
 463
 464         /* Set the default MAC address */
 465         device_id = rio_local_get_device_id(mport);
 466         ndev->dev_addr[0] = 0x00;
 467         ndev->dev_addr[1] = 0x01;
 468         ndev->dev_addr[2] = 0x00;
 469         ndev->dev_addr[3] = 0x01;
 470         ndev->dev_addr[4] = device_id >> 8;
 471         ndev->dev_addr[5] = device_id & 0xff;
 472
 473         ndev->netdev_ops = &rionet_netdev_ops;
 474         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 475         ndev->features = NETIF_F_LLTX;
 476         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 477
 478         spin_lock_init(&rnet->lock);
 479         spin_lock_init(&rnet->tx_lock);
 480
 481         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 482
 483         rc = register_netdev(ndev);
 484         if (rc != 0)
 485                 goto out;
 486
 487         printk("%s: %s %s Version %s, MAC %pM\n",
 488                ndev->name,
 489                DRV_NAME,
 490                DRV_DESC,
 491                DRV_VERSION,
 492                ndev->dev_addr);
 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);