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 (is_multicast_ether_addr(eth->h_dest)) { 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, get_order(sizeof(void *) * 379 RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size))); 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 const size_t rionet_active_bytes = sizeof(void *) * 436 RIO_MAX_ROUTE_ENTRIES(mport->sys_size); 437 438 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL, 439 get_order(rionet_active_bytes)); 440 if (!rionet_active) { 441 rc = -ENOMEM; 442 goto out; 443 } 444 memset((void *)rionet_active, 0, rionet_active_bytes); 445 446 /* Set up private area */ 447 rnet = netdev_priv(ndev); 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 ndev->netdev_ops = &rionet_netdev_ops; 460 ndev->mtu = RIO_MAX_MSG_SIZE - 14; 461 ndev->features = NETIF_F_LLTX; 462 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops); 463 464 spin_lock_init(&rnet->lock); 465 spin_lock_init(&rnet->tx_lock); 466 467 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL; 468 469 rc = register_netdev(ndev); 470 if (rc != 0) 471 goto out; 472 473 printk("%s: %s %s Version %s, MAC %pM\n", 474 ndev->name, 475 DRV_NAME, 476 DRV_DESC, 477 DRV_VERSION, 478 ndev->dev_addr); 479 480 out: 481 return rc; 482 } 483 484 /* 485 * XXX Make multi-net safe 486 */ 487 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id) 488 { 489 int rc = -ENODEV; 490 u32 lsrc_ops, ldst_ops; 491 struct rionet_peer *peer; 492 struct net_device *ndev = NULL; 493 494 /* If local device is not rionet capable, give up quickly */ 495 if (!rionet_capable) 496 goto out; 497 498 /* Allocate our net_device structure */ 499 ndev = alloc_etherdev(sizeof(struct rionet_private)); 500 if (ndev == NULL) { 501 rc = -ENOMEM; 502 goto out; 503 } 504 505 /* 506 * First time through, make sure local device is rionet 507 * capable, setup netdev, and set flags so this is skipped 508 * on later probes 509 */ 510 if (!rionet_check) { 511 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR, 512 &lsrc_ops); 513 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR, 514 &ldst_ops); 515 if (!is_rionet_capable(lsrc_ops, ldst_ops)) { 516 printk(KERN_ERR 517 "%s: local device is not network capable\n", 518 DRV_NAME); 519 rionet_check = 1; 520 rionet_capable = 0; 521 goto out; 522 } 523 524 rc = rionet_setup_netdev(rdev->net->hport, ndev); 525 rionet_check = 1; 526 } 527 528 /* 529 * If the remote device has mailbox/doorbell capabilities, 530 * add it to the peer list. 531 */ 532 if (dev_rionet_capable(rdev)) { 533 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) { 534 rc = -ENOMEM; 535 goto out; 536 } 537 peer->rdev = rdev; 538 list_add_tail(&peer->node, &rionet_peers); 539 } 540 541 rio_set_drvdata(rdev, ndev); 542 543 out: 544 return rc; 545 } 546 547 static struct rio_device_id rionet_id_table[] = { 548 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)} 549 }; 550 551 static struct rio_driver rionet_driver = { 552 .name = "rionet", 553 .id_table = rionet_id_table, 554 .probe = rionet_probe, 555 .remove = rionet_remove, 556 }; 557 558 static int __init rionet_init(void) 559 { 560 return rio_register_driver(&rionet_driver); 561 } 562 563 static void __exit rionet_exit(void) 564 { 565 rio_unregister_driver(&rionet_driver); 566 } 567 568 late_initcall(rionet_init); 569 module_exit(rionet_exit); 570