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); 575