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); 591