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     "0.3"
  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 #define RIONET_MAX_NETS         8
  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 struct rionet_net {
  72         struct net_device *ndev;
  73         struct list_head peers;
  74         struct rio_dev **active;
  75         int nact;       /* number of active peers */
  76 };
  77
  78 static struct rionet_net nets[RIONET_MAX_NETS];
  79
  80 #define is_rionet_capable(src_ops, dst_ops)                     \
  81                         ((src_ops & RIO_SRC_OPS_DATA_MSG) &&    \
  82                          (dst_ops & RIO_DST_OPS_DATA_MSG) &&    \
  83                          (src_ops & RIO_SRC_OPS_DOORBELL) &&    \
  84                          (dst_ops & RIO_DST_OPS_DOORBELL))
  85 #define dev_rionet_capable(dev) \
  86         is_rionet_capable(dev->src_ops, dev->dst_ops)
  87
  88 #define RIONET_MAC_MATCH(x)     (!memcmp((x), "\00\01\00\01", 4))
  89 #define RIONET_GET_DESTID(x)    ((*((u8 *)x + 4) << 8) | *((u8 *)x + 5))
  90
  91 static int rionet_rx_clean(struct net_device *ndev)
  92 {
  93         int i;
  94         int error = 0;
  95         struct rionet_private *rnet = netdev_priv(ndev);
  96         void *data;
  97
  98         i = rnet->rx_slot;
  99
 100         do {
 101                 if (!rnet->rx_skb[i])
 102                         continue;
 103
 104                 if (!(data = rio_get_inb_message(rnet->mport, RIONET_MAILBOX)))
 105                         break;
 106
 107                 rnet->rx_skb[i]->data = data;
 108                 skb_put(rnet->rx_skb[i], RIO_MAX_MSG_SIZE);
 109                 rnet->rx_skb[i]->protocol =
 110                     eth_type_trans(rnet->rx_skb[i], ndev);
 111                 error = netif_rx(rnet->rx_skb[i]);
 112
 113                 if (error == NET_RX_DROP) {
 114                         ndev->stats.rx_dropped++;
 115                 } else {
 116                         ndev->stats.rx_packets++;
 117                         ndev->stats.rx_bytes += RIO_MAX_MSG_SIZE;
 118                 }
 119
 120         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != rnet->rx_slot);
 121
 122         return i;
 123 }
 124
 125 static void rionet_rx_fill(struct net_device *ndev, int end)
 126 {
 127         int i;
 128         struct rionet_private *rnet = netdev_priv(ndev);
 129
 130         i = rnet->rx_slot;
 131         do {
 132                 rnet->rx_skb[i] = dev_alloc_skb(RIO_MAX_MSG_SIZE);
 133
 134                 if (!rnet->rx_skb[i])
 135                         break;
 136
 137                 rio_add_inb_buffer(rnet->mport, RIONET_MAILBOX,
 138                                    rnet->rx_skb[i]->data);
 139         } while ((i = (i + 1) % RIONET_RX_RING_SIZE) != end);
 140
 141         rnet->rx_slot = i;
 142 }
 143
 144 static int rionet_queue_tx_msg(struct sk_buff *skb, struct net_device *ndev,
 145                                struct rio_dev *rdev)
 146 {
 147         struct rionet_private *rnet = netdev_priv(ndev);
 148
 149         rio_add_outb_message(rnet->mport, rdev, 0, skb->data, skb->len);
 150         rnet->tx_skb[rnet->tx_slot] = skb;
 151
 152         ndev->stats.tx_packets++;
 153         ndev->stats.tx_bytes += skb->len;
 154
 155         if (++rnet->tx_cnt == RIONET_TX_RING_SIZE)
 156                 netif_stop_queue(ndev);
 157
 158         ++rnet->tx_slot;
 159         rnet->tx_slot &= (RIONET_TX_RING_SIZE - 1);
 160
 161         if (netif_msg_tx_queued(rnet))
 162                 printk(KERN_INFO "%s: queued skb len %8.8x\n", DRV_NAME,
 163                        skb->len);
 164
 165         return 0;
 166 }
 167
 168 static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 169 {
 170         int i;
 171         struct rionet_private *rnet = netdev_priv(ndev);
 172         struct ethhdr *eth = (struct ethhdr *)skb->data;
 173         u16 destid;
 174         unsigned long flags;
 175         int add_num = 1;
 176
 177         local_irq_save(flags);
 178         if (!spin_trylock(&rnet->tx_lock)) {
 179                 local_irq_restore(flags);
 180                 return NETDEV_TX_LOCKED;
 181         }
 182
 183         if (is_multicast_ether_addr(eth->h_dest))
 184                 add_num = nets[rnet->mport->id].nact;
 185
 186         if ((rnet->tx_cnt + add_num) > RIONET_TX_RING_SIZE) {
 187                 netif_stop_queue(ndev);
 188                 spin_unlock_irqrestore(&rnet->tx_lock, flags);
 189                 printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
 190                        ndev->name);
 191                 return NETDEV_TX_BUSY;
 192         }
 193
 194         if (is_multicast_ether_addr(eth->h_dest)) {
 195                 int count = 0;
 196
 197                 for (i = 0; i < RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size);
 198                                 i++)
 199                         if (nets[rnet->mport->id].active[i]) {
 200                                 rionet_queue_tx_msg(skb, ndev,
 201                                         nets[rnet->mport->id].active[i]);
 202                                 if (count)
 203                                         atomic_inc(&skb->users);
 204                                 count++;
 205                         }
 206         } else if (RIONET_MAC_MATCH(eth->h_dest)) {
 207                 destid = RIONET_GET_DESTID(eth->h_dest);
 208                 if (nets[rnet->mport->id].active[destid])
 209                         rionet_queue_tx_msg(skb, ndev,
 210                                         nets[rnet->mport->id].active[destid]);
 211         }
 212
 213         spin_unlock_irqrestore(&rnet->tx_lock, flags);
 214
 215         return NETDEV_TX_OK;
 216 }
 217
 218 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid,
 219                                u16 info)
 220 {
 221         struct net_device *ndev = dev_id;
 222         struct rionet_private *rnet = netdev_priv(ndev);
 223         struct rionet_peer *peer;
 224
 225         if (netif_msg_intr(rnet))
 226                 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x",
 227                        DRV_NAME, sid, tid, info);
 228         if (info == RIONET_DOORBELL_JOIN) {
 229                 if (!nets[rnet->mport->id].active[sid]) {
 230                         list_for_each_entry(peer,
 231                                            &nets[rnet->mport->id].peers, node) {
 232                                 if (peer->rdev->destid == sid) {
 233                                         nets[rnet->mport->id].active[sid] =
 234                                                                 peer->rdev;
 235                                         nets[rnet->mport->id].nact++;
 236                                 }
 237                         }
 238                         rio_mport_send_doorbell(mport, sid,
 239                                                 RIONET_DOORBELL_JOIN);
 240                 }
 241         } else if (info == RIONET_DOORBELL_LEAVE) {
 242                 nets[rnet->mport->id].active[sid] = NULL;
 243                 nets[rnet->mport->id].nact--;
 244         } else {
 245                 if (netif_msg_intr(rnet))
 246                         printk(KERN_WARNING "%s: unhandled doorbell\n",
 247                                DRV_NAME);
 248         }
 249 }
 250
 251 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 252 {
 253         int n;
 254         struct net_device *ndev = dev_id;
 255         struct rionet_private *rnet = netdev_priv(ndev);
 256
 257         if (netif_msg_intr(rnet))
 258                 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n",
 259                        DRV_NAME, mbox, slot);
 260
 261         spin_lock(&rnet->lock);
 262         if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot)
 263                 rionet_rx_fill(ndev, n);
 264         spin_unlock(&rnet->lock);
 265 }
 266
 267 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot)
 268 {
 269         struct net_device *ndev = dev_id;
 270         struct rionet_private *rnet = netdev_priv(ndev);
 271
 272         spin_lock(&rnet->lock);
 273
 274         if (netif_msg_intr(rnet))
 275                 printk(KERN_INFO
 276                        "%s: outbound message event, mbox %d slot %d\n",
 277                        DRV_NAME, mbox, slot);
 278
 279         while (rnet->tx_cnt && (rnet->ack_slot != slot)) {
 280                 /* dma unmap single */
 281                 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]);
 282                 rnet->tx_skb[rnet->ack_slot] = NULL;
 283                 ++rnet->ack_slot;
 284                 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1);
 285                 rnet->tx_cnt--;
 286         }
 287
 288         if (rnet->tx_cnt < RIONET_TX_RING_SIZE)
 289                 netif_wake_queue(ndev);
 290
 291         spin_unlock(&rnet->lock);
 292 }
 293
 294 static int rionet_open(struct net_device *ndev)
 295 {
 296         int i, rc = 0;
 297         struct rionet_peer *peer, *tmp;
 298         struct rionet_private *rnet = netdev_priv(ndev);
 299
 300         if (netif_msg_ifup(rnet))
 301                 printk(KERN_INFO "%s: open\n", DRV_NAME);
 302
 303         if ((rc = rio_request_inb_dbell(rnet->mport,
 304                                         (void *)ndev,
 305                                         RIONET_DOORBELL_JOIN,
 306                                         RIONET_DOORBELL_LEAVE,
 307                                         rionet_dbell_event)) < 0)
 308                 goto out;
 309
 310         if ((rc = rio_request_inb_mbox(rnet->mport,
 311                                        (void *)ndev,
 312                                        RIONET_MAILBOX,
 313                                        RIONET_RX_RING_SIZE,
 314                                        rionet_inb_msg_event)) < 0)
 315                 goto out;
 316
 317         if ((rc = rio_request_outb_mbox(rnet->mport,
 318                                         (void *)ndev,
 319                                         RIONET_MAILBOX,
 320                                         RIONET_TX_RING_SIZE,
 321                                         rionet_outb_msg_event)) < 0)
 322                 goto out;
 323
 324         /* Initialize inbound message ring */
 325         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 326                 rnet->rx_skb[i] = NULL;
 327         rnet->rx_slot = 0;
 328         rionet_rx_fill(ndev, 0);
 329
 330         rnet->tx_slot = 0;
 331         rnet->tx_cnt = 0;
 332         rnet->ack_slot = 0;
 333
 334         netif_carrier_on(ndev);
 335         netif_start_queue(ndev);
 336
 337         list_for_each_entry_safe(peer, tmp,
 338                                  &nets[rnet->mport->id].peers, node) {
 339                 if (!(peer->res = rio_request_outb_dbell(peer->rdev,
 340                                                          RIONET_DOORBELL_JOIN,
 341                                                          RIONET_DOORBELL_LEAVE)))
 342                 {
 343                         printk(KERN_ERR "%s: error requesting doorbells\n",
 344                                DRV_NAME);
 345                         continue;
 346                 }
 347
 348                 /* Send a join message */
 349                 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN);
 350         }
 351
 352       out:
 353         return rc;
 354 }
 355
 356 static int rionet_close(struct net_device *ndev)
 357 {
 358         struct rionet_private *rnet = netdev_priv(ndev);
 359         struct rionet_peer *peer, *tmp;
 360         int i;
 361
 362         if (netif_msg_ifup(rnet))
 363                 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name);
 364
 365         netif_stop_queue(ndev);
 366         netif_carrier_off(ndev);
 367
 368         for (i = 0; i < RIONET_RX_RING_SIZE; i++)
 369                 kfree_skb(rnet->rx_skb[i]);
 370
 371         list_for_each_entry_safe(peer, tmp,
 372                                  &nets[rnet->mport->id].peers, node) {
 373                 if (nets[rnet->mport->id].active[peer->rdev->destid]) {
 374                         rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE);
 375                         nets[rnet->mport->id].active[peer->rdev->destid] = NULL;
 376                 }
 377                 rio_release_outb_dbell(peer->rdev, peer->res);
 378         }
 379
 380         rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN,
 381                               RIONET_DOORBELL_LEAVE);
 382         rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX);
 383         rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX);
 384
 385         return 0;
 386 }
 387
 388 static void rionet_remove(struct rio_dev *rdev)
 389 {
 390         struct net_device *ndev = rio_get_drvdata(rdev);
 391         unsigned char netid = rdev->net->hport->id;
 392         struct rionet_peer *peer, *tmp;
 393
 394         unregister_netdev(ndev);
 395
 396         free_pages((unsigned long)nets[netid].active, get_order(sizeof(void *) *
 397                         RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size)));
 398         nets[netid].active = NULL;
 399
 400         list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) {
 401                 list_del(&peer->node);
 402                 kfree(peer);
 403         }
 404
 405         free_netdev(ndev);
 406 }
 407
 408 static void rionet_get_drvinfo(struct net_device *ndev,
 409                                struct ethtool_drvinfo *info)
 410 {
 411         struct rionet_private *rnet = netdev_priv(ndev);
 412
 413         strcpy(info->driver, DRV_NAME);
 414         strcpy(info->version, DRV_VERSION);
 415         strcpy(info->fw_version, "n/a");
 416         strcpy(info->bus_info, rnet->mport->name);
 417 }
 418
 419 static u32 rionet_get_msglevel(struct net_device *ndev)
 420 {
 421         struct rionet_private *rnet = netdev_priv(ndev);
 422
 423         return rnet->msg_enable;
 424 }
 425
 426 static void rionet_set_msglevel(struct net_device *ndev, u32 value)
 427 {
 428         struct rionet_private *rnet = netdev_priv(ndev);
 429
 430         rnet->msg_enable = value;
 431 }
 432
 433 static const struct ethtool_ops rionet_ethtool_ops = {
 434         .get_drvinfo = rionet_get_drvinfo,
 435         .get_msglevel = rionet_get_msglevel,
 436         .set_msglevel = rionet_set_msglevel,
 437         .get_link = ethtool_op_get_link,
 438 };
 439
 440 static const struct net_device_ops rionet_netdev_ops = {
 441         .ndo_open               = rionet_open,
 442         .ndo_stop               = rionet_close,
 443         .ndo_start_xmit         = rionet_start_xmit,
 444         .ndo_change_mtu         = eth_change_mtu,
 445         .ndo_validate_addr      = eth_validate_addr,
 446         .ndo_set_mac_address    = eth_mac_addr,
 447 };
 448
 449 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev)
 450 {
 451         int rc = 0;
 452         struct rionet_private *rnet;
 453         u16 device_id;
 454         const size_t rionet_active_bytes = sizeof(void *) *
 455                                 RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
 456
 457         nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL,
 458                                                 get_order(rionet_active_bytes));
 459         if (!nets[mport->id].active) {
 460                 rc = -ENOMEM;
 461                 goto out;
 462         }
 463         memset((void *)nets[mport->id].active, 0, rionet_active_bytes);
 464
 465         /* Set up private area */
 466         rnet = netdev_priv(ndev);
 467         rnet->mport = mport;
 468
 469         /* Set the default MAC address */
 470         device_id = rio_local_get_device_id(mport);
 471         ndev->dev_addr[0] = 0x00;
 472         ndev->dev_addr[1] = 0x01;
 473         ndev->dev_addr[2] = 0x00;
 474         ndev->dev_addr[3] = 0x01;
 475         ndev->dev_addr[4] = device_id >> 8;
 476         ndev->dev_addr[5] = device_id & 0xff;
 477
 478         ndev->netdev_ops = &rionet_netdev_ops;
 479         ndev->mtu = RIO_MAX_MSG_SIZE - 14;
 480         ndev->features = NETIF_F_LLTX;
 481         SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops);
 482
 483         spin_lock_init(&rnet->lock);
 484         spin_lock_init(&rnet->tx_lock);
 485
 486         rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL;
 487
 488         rc = register_netdev(ndev);
 489         if (rc != 0)
 490                 goto out;
 491
 492         printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n",
 493                ndev->name,
 494                DRV_NAME,
 495                DRV_DESC,
 496                DRV_VERSION,
 497                ndev->dev_addr,
 498                mport->name);
 499
 500       out:
 501         return rc;
 502 }
 503
 504 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1];
 505
 506 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id)
 507 {
 508         int rc = -ENODEV;
 509         u32 lsrc_ops, ldst_ops;
 510         struct rionet_peer *peer;
 511         struct net_device *ndev = NULL;
 512         unsigned char netid = rdev->net->hport->id;
 513         int oldnet;
 514
 515         if (netid >= RIONET_MAX_NETS)
 516                 return rc;
 517
 518         oldnet = test_and_set_bit(netid, net_table);
 519
 520         /*
 521          * First time through, make sure local device is rionet
 522          * capable, setup netdev (will be skipped on later probes)
 523          */
 524         if (!oldnet) {
 525                 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR,
 526                                          &lsrc_ops);
 527                 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR,
 528                                          &ldst_ops);
 529                 if (!is_rionet_capable(lsrc_ops, ldst_ops)) {
 530                         printk(KERN_ERR
 531                                "%s: local device %s is not network capable\n",
 532                                DRV_NAME, rdev->net->hport->name);
 533                         goto out;
 534                 }
 535
 536                 /* Allocate our net_device structure */
 537                 ndev = alloc_etherdev(sizeof(struct rionet_private));
 538                 if (ndev == NULL) {
 539                         rc = -ENOMEM;
 540                         goto out;
 541                 }
 542                 nets[netid].ndev = ndev;
 543                 rc = rionet_setup_netdev(rdev->net->hport, ndev);
 544                 INIT_LIST_HEAD(&nets[netid].peers);
 545                 nets[netid].nact = 0;
 546         } else if (nets[netid].ndev == NULL)
 547                 goto out;
 548
 549         /*
 550          * If the remote device has mailbox/doorbell capabilities,
 551          * add it to the peer list.
 552          */
 553         if (dev_rionet_capable(rdev)) {
 554                 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) {
 555                         rc = -ENOMEM;
 556                         goto out;
 557                 }
 558                 peer->rdev = rdev;
 559                 list_add_tail(&peer->node, &nets[netid].peers);
 560         }
 561
 562         rio_set_drvdata(rdev, nets[netid].ndev);
 563
 564       out:
 565         return rc;
 566 }
 567
 568 static struct rio_device_id rionet_id_table[] = {
 569         {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}
 570 };
 571
 572 static struct rio_driver rionet_driver = {
 573         .name = "rionet",
 574         .id_table = rionet_id_table,
 575         .probe = rionet_probe,
 576         .remove = rionet_remove,
 577 };
 578
 579 static int __init rionet_init(void)
 580 {
 581         return rio_register_driver(&rionet_driver);
 582 }
 583
 584 static void __exit rionet_exit(void)
 585 {
 586         rio_unregister_driver(&rionet_driver);
 587 }
 588
 589 late_initcall(rionet_init);
 590 module_exit(rionet_exit);