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 else { 212 /* 213 * If the target device was removed from the list of 214 * active peers but we still have TX packets targeting 215 * it just report sending a packet to the target 216 * (without actual packet transfer). 217 */ 218 dev_kfree_skb_any(skb); 219 ndev->stats.tx_packets++; 220 ndev->stats.tx_bytes += skb->len; 221 } 222 } 223 224 spin_unlock_irqrestore(&rnet->tx_lock, flags); 225 226 return NETDEV_TX_OK; 227 } 228 229 static void rionet_dbell_event(struct rio_mport *mport, void *dev_id, u16 sid, u16 tid, 230 u16 info) 231 { 232 struct net_device *ndev = dev_id; 233 struct rionet_private *rnet = netdev_priv(ndev); 234 struct rionet_peer *peer; 235 236 if (netif_msg_intr(rnet)) 237 printk(KERN_INFO "%s: doorbell sid %4.4x tid %4.4x info %4.4x", 238 DRV_NAME, sid, tid, info); 239 if (info == RIONET_DOORBELL_JOIN) { 240 if (!nets[rnet->mport->id].active[sid]) { 241 list_for_each_entry(peer, 242 &nets[rnet->mport->id].peers, node) { 243 if (peer->rdev->destid == sid) { 244 nets[rnet->mport->id].active[sid] = 245 peer->rdev; 246 nets[rnet->mport->id].nact++; 247 } 248 } 249 rio_mport_send_doorbell(mport, sid, 250 RIONET_DOORBELL_JOIN); 251 } 252 } else if (info == RIONET_DOORBELL_LEAVE) { 253 nets[rnet->mport->id].active[sid] = NULL; 254 nets[rnet->mport->id].nact--; 255 } else { 256 if (netif_msg_intr(rnet)) 257 printk(KERN_WARNING "%s: unhandled doorbell\n", 258 DRV_NAME); 259 } 260 } 261 262 static void rionet_inb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot) 263 { 264 int n; 265 struct net_device *ndev = dev_id; 266 struct rionet_private *rnet = netdev_priv(ndev); 267 268 if (netif_msg_intr(rnet)) 269 printk(KERN_INFO "%s: inbound message event, mbox %d slot %d\n", 270 DRV_NAME, mbox, slot); 271 272 spin_lock(&rnet->lock); 273 if ((n = rionet_rx_clean(ndev)) != rnet->rx_slot) 274 rionet_rx_fill(ndev, n); 275 spin_unlock(&rnet->lock); 276 } 277 278 static void rionet_outb_msg_event(struct rio_mport *mport, void *dev_id, int mbox, int slot) 279 { 280 struct net_device *ndev = dev_id; 281 struct rionet_private *rnet = netdev_priv(ndev); 282 283 spin_lock(&rnet->lock); 284 285 if (netif_msg_intr(rnet)) 286 printk(KERN_INFO 287 "%s: outbound message event, mbox %d slot %d\n", 288 DRV_NAME, mbox, slot); 289 290 while (rnet->tx_cnt && (rnet->ack_slot != slot)) { 291 /* dma unmap single */ 292 dev_kfree_skb_irq(rnet->tx_skb[rnet->ack_slot]); 293 rnet->tx_skb[rnet->ack_slot] = NULL; 294 ++rnet->ack_slot; 295 rnet->ack_slot &= (RIONET_TX_RING_SIZE - 1); 296 rnet->tx_cnt--; 297 } 298 299 if (rnet->tx_cnt < RIONET_TX_RING_SIZE) 300 netif_wake_queue(ndev); 301 302 spin_unlock(&rnet->lock); 303 } 304 305 static int rionet_open(struct net_device *ndev) 306 { 307 int i, rc = 0; 308 struct rionet_peer *peer, *tmp; 309 struct rionet_private *rnet = netdev_priv(ndev); 310 311 if (netif_msg_ifup(rnet)) 312 printk(KERN_INFO "%s: open\n", DRV_NAME); 313 314 if ((rc = rio_request_inb_dbell(rnet->mport, 315 (void *)ndev, 316 RIONET_DOORBELL_JOIN, 317 RIONET_DOORBELL_LEAVE, 318 rionet_dbell_event)) < 0) 319 goto out; 320 321 if ((rc = rio_request_inb_mbox(rnet->mport, 322 (void *)ndev, 323 RIONET_MAILBOX, 324 RIONET_RX_RING_SIZE, 325 rionet_inb_msg_event)) < 0) 326 goto out; 327 328 if ((rc = rio_request_outb_mbox(rnet->mport, 329 (void *)ndev, 330 RIONET_MAILBOX, 331 RIONET_TX_RING_SIZE, 332 rionet_outb_msg_event)) < 0) 333 goto out; 334 335 /* Initialize inbound message ring */ 336 for (i = 0; i < RIONET_RX_RING_SIZE; i++) 337 rnet->rx_skb[i] = NULL; 338 rnet->rx_slot = 0; 339 rionet_rx_fill(ndev, 0); 340 341 rnet->tx_slot = 0; 342 rnet->tx_cnt = 0; 343 rnet->ack_slot = 0; 344 345 netif_carrier_on(ndev); 346 netif_start_queue(ndev); 347 348 list_for_each_entry_safe(peer, tmp, 349 &nets[rnet->mport->id].peers, node) { 350 if (!(peer->res = rio_request_outb_dbell(peer->rdev, 351 RIONET_DOORBELL_JOIN, 352 RIONET_DOORBELL_LEAVE))) 353 { 354 printk(KERN_ERR "%s: error requesting doorbells\n", 355 DRV_NAME); 356 continue; 357 } 358 359 /* Send a join message */ 360 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_JOIN); 361 } 362 363 out: 364 return rc; 365 } 366 367 static int rionet_close(struct net_device *ndev) 368 { 369 struct rionet_private *rnet = netdev_priv(ndev); 370 struct rionet_peer *peer, *tmp; 371 int i; 372 373 if (netif_msg_ifup(rnet)) 374 printk(KERN_INFO "%s: close %s\n", DRV_NAME, ndev->name); 375 376 netif_stop_queue(ndev); 377 netif_carrier_off(ndev); 378 379 for (i = 0; i < RIONET_RX_RING_SIZE; i++) 380 kfree_skb(rnet->rx_skb[i]); 381 382 list_for_each_entry_safe(peer, tmp, 383 &nets[rnet->mport->id].peers, node) { 384 if (nets[rnet->mport->id].active[peer->rdev->destid]) { 385 rio_send_doorbell(peer->rdev, RIONET_DOORBELL_LEAVE); 386 nets[rnet->mport->id].active[peer->rdev->destid] = NULL; 387 } 388 rio_release_outb_dbell(peer->rdev, peer->res); 389 } 390 391 rio_release_inb_dbell(rnet->mport, RIONET_DOORBELL_JOIN, 392 RIONET_DOORBELL_LEAVE); 393 rio_release_inb_mbox(rnet->mport, RIONET_MAILBOX); 394 rio_release_outb_mbox(rnet->mport, RIONET_MAILBOX); 395 396 return 0; 397 } 398 399 static void rionet_remove_dev(struct device *dev, struct subsys_interface *sif) 400 { 401 struct rio_dev *rdev = to_rio_dev(dev); 402 unsigned char netid = rdev->net->hport->id; 403 struct rionet_peer *peer, *tmp; 404 405 if (dev_rionet_capable(rdev)) { 406 list_for_each_entry_safe(peer, tmp, &nets[netid].peers, node) { 407 if (peer->rdev == rdev) { 408 if (nets[netid].active[rdev->destid]) { 409 nets[netid].active[rdev->destid] = NULL; 410 nets[netid].nact--; 411 } 412 413 list_del(&peer->node); 414 kfree(peer); 415 break; 416 } 417 } 418 } 419 } 420 421 static void rionet_get_drvinfo(struct net_device *ndev, 422 struct ethtool_drvinfo *info) 423 { 424 struct rionet_private *rnet = netdev_priv(ndev); 425 426 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 427 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 428 strlcpy(info->fw_version, "n/a", sizeof(info->fw_version)); 429 strlcpy(info->bus_info, rnet->mport->name, sizeof(info->bus_info)); 430 } 431 432 static u32 rionet_get_msglevel(struct net_device *ndev) 433 { 434 struct rionet_private *rnet = netdev_priv(ndev); 435 436 return rnet->msg_enable; 437 } 438 439 static void rionet_set_msglevel(struct net_device *ndev, u32 value) 440 { 441 struct rionet_private *rnet = netdev_priv(ndev); 442 443 rnet->msg_enable = value; 444 } 445 446 static const struct ethtool_ops rionet_ethtool_ops = { 447 .get_drvinfo = rionet_get_drvinfo, 448 .get_msglevel = rionet_get_msglevel, 449 .set_msglevel = rionet_set_msglevel, 450 .get_link = ethtool_op_get_link, 451 }; 452 453 static const struct net_device_ops rionet_netdev_ops = { 454 .ndo_open = rionet_open, 455 .ndo_stop = rionet_close, 456 .ndo_start_xmit = rionet_start_xmit, 457 .ndo_change_mtu = eth_change_mtu, 458 .ndo_validate_addr = eth_validate_addr, 459 .ndo_set_mac_address = eth_mac_addr, 460 }; 461 462 static int rionet_setup_netdev(struct rio_mport *mport, struct net_device *ndev) 463 { 464 int rc = 0; 465 struct rionet_private *rnet; 466 u16 device_id; 467 const size_t rionet_active_bytes = sizeof(void *) * 468 RIO_MAX_ROUTE_ENTRIES(mport->sys_size); 469 470 nets[mport->id].active = (struct rio_dev **)__get_free_pages(GFP_KERNEL, 471 get_order(rionet_active_bytes)); 472 if (!nets[mport->id].active) { 473 rc = -ENOMEM; 474 goto out; 475 } 476 memset((void *)nets[mport->id].active, 0, rionet_active_bytes); 477 478 /* Set up private area */ 479 rnet = netdev_priv(ndev); 480 rnet->mport = mport; 481 482 /* Set the default MAC address */ 483 device_id = rio_local_get_device_id(mport); 484 ndev->dev_addr[0] = 0x00; 485 ndev->dev_addr[1] = 0x01; 486 ndev->dev_addr[2] = 0x00; 487 ndev->dev_addr[3] = 0x01; 488 ndev->dev_addr[4] = device_id >> 8; 489 ndev->dev_addr[5] = device_id & 0xff; 490 491 ndev->netdev_ops = &rionet_netdev_ops; 492 ndev->mtu = RIO_MAX_MSG_SIZE - 14; 493 ndev->features = NETIF_F_LLTX; 494 SET_NETDEV_DEV(ndev, &mport->dev); 495 ndev->ethtool_ops = &rionet_ethtool_ops; 496 497 spin_lock_init(&rnet->lock); 498 spin_lock_init(&rnet->tx_lock); 499 500 rnet->msg_enable = RIONET_DEFAULT_MSGLEVEL; 501 502 rc = register_netdev(ndev); 503 if (rc != 0) 504 goto out; 505 506 printk(KERN_INFO "%s: %s %s Version %s, MAC %pM, %s\n", 507 ndev->name, 508 DRV_NAME, 509 DRV_DESC, 510 DRV_VERSION, 511 ndev->dev_addr, 512 mport->name); 513 514 out: 515 return rc; 516 } 517 518 static unsigned long net_table[RIONET_MAX_NETS/sizeof(unsigned long) + 1]; 519 520 static int rionet_add_dev(struct device *dev, struct subsys_interface *sif) 521 { 522 int rc = -ENODEV; 523 u32 lsrc_ops, ldst_ops; 524 struct rionet_peer *peer; 525 struct net_device *ndev = NULL; 526 struct rio_dev *rdev = to_rio_dev(dev); 527 unsigned char netid = rdev->net->hport->id; 528 int oldnet; 529 530 if (netid >= RIONET_MAX_NETS) 531 return rc; 532 533 oldnet = test_and_set_bit(netid, net_table); 534 535 /* 536 * If first time through this net, make sure local device is rionet 537 * capable and setup netdev (this step will be skipped in later probes 538 * on the same net). 539 */ 540 if (!oldnet) { 541 rio_local_read_config_32(rdev->net->hport, RIO_SRC_OPS_CAR, 542 &lsrc_ops); 543 rio_local_read_config_32(rdev->net->hport, RIO_DST_OPS_CAR, 544 &ldst_ops); 545 if (!is_rionet_capable(lsrc_ops, ldst_ops)) { 546 printk(KERN_ERR 547 "%s: local device %s is not network capable\n", 548 DRV_NAME, rdev->net->hport->name); 549 goto out; 550 } 551 552 /* Allocate our net_device structure */ 553 ndev = alloc_etherdev(sizeof(struct rionet_private)); 554 if (ndev == NULL) { 555 rc = -ENOMEM; 556 goto out; 557 } 558 nets[netid].ndev = ndev; 559 rc = rionet_setup_netdev(rdev->net->hport, ndev); 560 if (rc) { 561 printk(KERN_ERR "%s: failed to setup netdev (rc=%d)\n", 562 DRV_NAME, rc); 563 goto out; 564 } 565 566 INIT_LIST_HEAD(&nets[netid].peers); 567 nets[netid].nact = 0; 568 } else if (nets[netid].ndev == NULL) 569 goto out; 570 571 /* 572 * If the remote device has mailbox/doorbell capabilities, 573 * add it to the peer list. 574 */ 575 if (dev_rionet_capable(rdev)) { 576 if (!(peer = kmalloc(sizeof(struct rionet_peer), GFP_KERNEL))) { 577 rc = -ENOMEM; 578 goto out; 579 } 580 peer->rdev = rdev; 581 list_add_tail(&peer->node, &nets[netid].peers); 582 } 583 584 return 0; 585 out: 586 return rc; 587 } 588 589 #ifdef MODULE 590 static struct rio_device_id rionet_id_table[] = { 591 {RIO_DEVICE(RIO_ANY_ID, RIO_ANY_ID)}, 592 { 0, } /* terminate list */ 593 }; 594 595 MODULE_DEVICE_TABLE(rapidio, rionet_id_table); 596 #endif 597 598 static struct subsys_interface rionet_interface = { 599 .name = "rionet", 600 .subsys = &rio_bus_type, 601 .add_dev = rionet_add_dev, 602 .remove_dev = rionet_remove_dev, 603 }; 604 605 static int __init rionet_init(void) 606 { 607 return subsys_interface_register(&rionet_interface); 608 } 609 610 static void __exit rionet_exit(void) 611 { 612 struct rionet_private *rnet; 613 struct net_device *ndev; 614 struct rionet_peer *peer, *tmp; 615 int i; 616 617 for (i = 0; i < RIONET_MAX_NETS; i++) { 618 if (nets[i].ndev != NULL) { 619 ndev = nets[i].ndev; 620 rnet = netdev_priv(ndev); 621 unregister_netdev(ndev); 622 623 list_for_each_entry_safe(peer, 624 tmp, &nets[i].peers, node) { 625 list_del(&peer->node); 626 kfree(peer); 627 } 628 629 free_pages((unsigned long)nets[i].active, 630 get_order(sizeof(void *) * 631 RIO_MAX_ROUTE_ENTRIES(rnet->mport->sys_size))); 632 nets[i].active = NULL; 633 634 free_netdev(ndev); 635 } 636 } 637 638 subsys_interface_unregister(&rionet_interface); 639 } 640 641 late_initcall(rionet_init); 642 module_exit(rionet_exit); 643