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(pef, src_ops, dst_ops) \ 84 ((pef & RIO_PEF_INB_MBOX) && \ 85 (pef & RIO_PEF_INB_DOORBELL) && \ 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->pef, dev->src_ops, dev->dst_ops) 90 91 #define RIONET_MAC_MATCH(x) (*(u32 *)x == 0x00010001) 92 #define RIONET_GET_DESTID(x) (*(u16 *)(x + 4)) 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 (eth->h_dest[0] & 0x01) { 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 u32 pwdcsr; 286 struct rionet_private *rnet = netdev_priv(ndev); 287 288 if (netif_msg_ifup(rnet)) 289 printk(KERN_INFO "%s: open\n", DRV_NAME); 290 291 if ((rc = rio_request_inb_dbell(rnet->mport, 292 (void *)ndev, 293 RIONET_DOORBELL_JOIN, 294 RIONET_DOORBELL_LEAVE, 295 rionet_dbell_event)) < 0) 296 goto out; 297 298 if ((rc = rio_request_inb_mbox(rnet->mport, 299 (void *)ndev, 300 RIONET_MAILBOX, 301 RIONET_RX_RING_SIZE, 302 rionet_inb_msg_event)) < 0) 303 goto out; 304 305 if ((rc = rio_request_outb_mbox(rnet->mport, 306 (void *)ndev, 307 RIONET_MAILBOX, 308 RIONET_TX_RING_SIZE, 309 rionet_outb_msg_event)) < 0) 310 goto out; 311 312 /* Initialize inbound message ring */ 313 for (i = 0; i < RIONET_RX_RING_SIZE; i++) 314 rnet->rx_skb[i] = NULL; 315 rnet->rx_slot = 0; 316 rionet_rx_fill(ndev, 0); 317 318 rnet->tx_slot = 0; 319 rnet->tx_cnt = 0; 320 rnet->ack_slot = 0; 321 322 netif_carrier_on(ndev); 323 netif_start_queue(ndev); 324 325 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) { 326 if (!(peer->res = rio_request_outb_dbell(peer->rdev, 327 RIONET_DOORBELL_JOIN, 328 RIONET_DOORBELL_LEAVE))) 329 { 330 printk(KERN_ERR "%s: error requesting doorbells\n", 331 DRV_NAME); 332 continue; 333 } 334 335 /* 336 * If device has initialized inbound doorbells, 337 * send a join message 338 */ 339 rio_read_config_32(peer->rdev, RIO_WRITE_PORT_CSR, &pwdcsr); 340 if (pwdcsr & RIO_DOORBELL_AVAIL) 341 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN); 342 } 343 344 out: 345 return rc; 346 } 347 348 static int rionet_close(struct net_device *ndev) 349 { 350 struct rionet_private *rnet = netdev_priv(ndev); 351 struct rionet_peer *peer, *tmp; 352 int i; 353 354 if (netif_msg_ifup(rnet)) 355 printk(KERN_INFO "%s: close\n", DRV_NAME); 356 357 netif_stop_queue(ndev); 358 netif_carrier_off(ndev); 359 360 for (i = 0; i < RIONET_RX_RING_SIZE; i++) 361 kfree_skb(rnet->rx_skb[i]); 362 363 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) { 364 if (rionet_active[peer->rdev->destid]) { 365 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE); 366 rionet_active[peer->rdev->destid] = NULL; 367 } 368 rio_release_outb_dbell(peer->rdev, peer->res); 369 } 370 371 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN, 372 RIONET_DOORBELL_LEAVE); 373 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX); 374 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX); 375 376 return 0; 377 } 378 379 static void rionet_remove(struct rio_dev *rdev) 380 { 381 struct net_device *ndev = rio_get_drvdata(rdev); 382 struct rionet_peer *peer, *tmp; 383 384 free_pages((unsigned long)rionet_active, rdev->net->hport->sys_size ? 385 __fls(sizeof(void *)) + 4 : 0); 386 unregister_netdev(ndev); 387 free_netdev(ndev); 388 389 list_for_each_entry_safe(peer, tmp, &rionet_peers, node) { 390 list_del(&peer->node); 391 kfree(peer); 392 } 393 } 394 395 static void rionet_get_drvinfo(struct net_device *ndev, 396 struct ethtool_drvinfo *info) 397 { 398 struct rionet_private *rnet = netdev_priv(ndev); 399 400 strcpy(info->driver, DRV_NAME); 401 strcpy(info->version, DRV_VERSION); 402 strcpy(info->fw_version, "n/a"); 403 strcpy(info->bus_info, rnet->mport->name); 404 } 405 406 static u32 rionet_get_msglevel(struct net_device *ndev) 407 { 408 struct rionet_private *rnet = netdev_priv(ndev); 409 410 return rnet->msg_enable; 411 } 412 413 static void rionet_set_msglevel(struct net_device *ndev, u32 value) 414 { 415 struct rionet_private *rnet = netdev_priv(ndev); 416 417 rnet->msg_enable = value; 418 } 419 420 static const struct ethtool_ops rionet_ethtool_ops = { 421 .get_drvinfo = rionet_get_drvinfo, 422 .get_msglevel = rionet_get_msglevel, 423 .set_msglevel = rionet_set_msglevel, 424 .get_link = ethtool_op_get_link, 425 }; 426 427 static const struct net_device_ops rionet_netdev_ops = { 428 .ndo_open = rionet_open, 429 .ndo_stop = rionet_close, 430 .ndo_start_xmit = rionet_start_xmit, 431 .ndo_change_mtu = eth_change_mtu, 432 .ndo_validate_addr = eth_validate_addr, 433 .ndo_set_mac_address = eth_mac_addr, 434 }; 435 436 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev) 437 { 438 int rc = 0; 439 struct rionet_private *rnet; 440 u16 device_id; 441 442 rionet_active = (struct rio_dev **)__get_free_pages(GFP_KERNEL, 443 mport->sys_size ? __fls(sizeof(void *)) + 4 : 0); 444 if (!rionet_active) { 445 rc = -ENOMEM; 446 goto out; 447 } 448 memset((void *)rionet_active, 0, sizeof(void *) * 449 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)); 450 451 /* Set up private area */ 452 rnet = netdev_priv(ndev); 453 rnet->mport = mport; 454 455 /* Set the default MAC address */ 456 device_id = rio_local_get_device_id(mport); 457 ndev->dev_addr[0] = 0x00; 458 ndev->dev_addr[1] = 0x01; 459 ndev->dev_addr[2] = 0x00; 460 ndev->dev_addr[3] = 0x01; 461 ndev->dev_addr[4] = device_id >> 8; 462 ndev->dev_addr[5] = device_id & 0xff; 463 464 ndev->netdev_ops = &rionet_netdev_ops; 465 ndev->mtu = RIO_MAX_MSG_SIZE - 14; 466 ndev->features = NETIF_F_LLTX; 467 SET_ETHTOOL_OPS(ndev, &rionet_ethtool_ops); 468 469 spin_lock_init(&rnet->lock); 470 spin_lock_init(&rnet->tx_lock); 471 472 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL; 473 474 rc = register_netdev(ndev); 475 if (rc != 0) 476 goto out; 477 478 printk("%s: %s %s Version %s, MAC %pM\n", 479 ndev->name, 480 DRV_NAME, 481 DRV_DESC, 482 DRV_VERSION, 483 ndev->dev_addr); 484 485 out: 486 return rc; 487 } 488 489 /* 490 * XXX Make multi-net safe 491 */ 492 static int rionet_probe(struct rio_dev *rdev, const struct rio_device_id *id) 493 { 494 int rc = -ENODEV; 495 u32 lpef, lsrc_ops, ldst_ops; 496 struct rionet_peer *peer; 497 struct net_device *ndev = NULL; 498 499 /* If local device is not rionet capable, give up quickly */ 500 if (!rionet_capable) 501 goto out; 502 503 /* Allocate our net_device structure */ 504 ndev = alloc_etherdev(sizeof(struct rionet_private)); 505 if (ndev == NULL) { 506 printk(KERN_INFO "%s: could not allocate ethernet device.\n", 507 DRV_NAME); 508 rc = -ENOMEM; 509 goto out; 510 } 511 512 /* 513 * First time through, make sure local device is rionet 514 * capable, setup netdev, and set flags so this is skipped 515 * on later probes 516 */ 517 if (!rionet_check) { 518 rio_local_read_config_32(rdev->net->hport, RIO_PEF_CAR, &lpef); 519 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR, 520 &lsrc_ops); 521 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR, 522 &ldst_ops); 523 if (!is_rionet_capable(lpef, lsrc_ops, ldst_ops)) { 524 printk(KERN_ERR 525 "%s: local device is not network capable\n", 526 DRV_NAME); 527 rionet_check = 1; 528 rionet_capable = 0; 529 goto out; 530 } 531 532 rc = rionet_setup_netdev(rdev->net->hport, ndev); 533 rionet_check = 1; 534 } 535 536 /* 537 * If the remote device has mailbox/doorbell capabilities, 538 * add it to the peer list. 539 */ 540 if (dev_rionet_capable(rdev)) { 541 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) { 542 rc = -ENOMEM; 543 goto out; 544 } 545 peer->rdev = rdev; 546 list_add_tail(&peer->node, &rionet_peers); 547 } 548 549 rio_set_drvdata(rdev, ndev); 550 551 out: 552 return rc; 553 } 554 555 static struct rio_device_id rionet_id_table[] = { 556 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)} 557 }; 558 559 static struct rio_driver rionet_driver = { 560 .name = "rionet", 561 .id_table = rionet_id_table, 562 .probe = rionet_probe, 563 .remove = rionet_remove, 564 }; 565 566 static int __init rionet_init(void) 567 { 568 return rio_register_driver(&rionet_driver); 569 } 570 571 static void __exit rionet_exit(void) 572 { 573 rio_unregister_driver(&rionet_driver); 574 } 575 576 late_initcall(rionet_init); 577 module_exit(rionet_exit); 578