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); 574