1 /* sunvnet.c: Sun LDOM Virtual Network Driver. 2 * 3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/types.h> 11 #include <linux/slab.h> 12 #include <linux/delay.h> 13 #include <linux/init.h> 14 #include <linux/netdevice.h> 15 #include <linux/ethtool.h> 16 #include <linux/etherdevice.h> 17 #include <linux/mutex.h> 18 19 #include <asm/vio.h> 20 #include <asm/ldc.h> 21 22 #include "sunvnet.h" 23 24 #define DRV_MODULE_NAME "sunvnet" 25 #define DRV_MODULE_VERSION "1.0" 26 #define DRV_MODULE_RELDATE "June 25, 2007" 27 28 static char version[] = 29 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 30 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 31 MODULE_DESCRIPTION("Sun LDOM virtual network driver"); 32 MODULE_LICENSE("GPL"); 33 MODULE_VERSION(DRV_MODULE_VERSION); 34 35 /* Heuristic for the number of times to exponentially backoff and 36 * retry sending an LDC trigger when EAGAIN is encountered 37 */ 38 #define VNET_MAX_RETRIES 10 39 40 /* Ordered from largest major to lowest */ 41 static struct vio_version vnet_versions[] = { 42 { .major = 1, .minor = 0 }, 43 }; 44 45 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) 46 { 47 return vio_dring_avail(dr, VNET_TX_RING_SIZE); 48 } 49 50 static int vnet_handle_unknown(struct vnet_port *port, void *arg) 51 { 52 struct vio_msg_tag *pkt = arg; 53 54 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n", 55 pkt->type, pkt->stype, pkt->stype_env, pkt->sid); 56 pr_err("Resetting connection\n"); 57 58 ldc_disconnect(port->vio.lp); 59 60 return -ECONNRESET; 61 } 62 63 static int vnet_send_attr(struct vio_driver_state *vio) 64 { 65 struct vnet_port *port = to_vnet_port(vio); 66 struct net_device *dev = port->vp->dev; 67 struct vio_net_attr_info pkt; 68 int i; 69 70 memset(&pkt, 0, sizeof(pkt)); 71 pkt.tag.type = VIO_TYPE_CTRL; 72 pkt.tag.stype = VIO_SUBTYPE_INFO; 73 pkt.tag.stype_env = VIO_ATTR_INFO; 74 pkt.tag.sid = vio_send_sid(vio); 75 pkt.xfer_mode = VIO_DRING_MODE; 76 pkt.addr_type = VNET_ADDR_ETHERMAC; 77 pkt.ack_freq = 0; 78 for (i = 0; i < 6; i++) 79 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); 80 pkt.mtu = ETH_FRAME_LEN; 81 82 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " 83 "ackfreq[%u] mtu[%llu]\n", 84 pkt.xfer_mode, pkt.addr_type, 85 (unsigned long long) pkt.addr, 86 pkt.ack_freq, 87 (unsigned long long) pkt.mtu); 88 89 return vio_ldc_send(vio, &pkt, sizeof(pkt)); 90 } 91 92 static int handle_attr_info(struct vio_driver_state *vio, 93 struct vio_net_attr_info *pkt) 94 { 95 viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] " 96 "ackfreq[%u] mtu[%llu]\n", 97 pkt->xfer_mode, pkt->addr_type, 98 (unsigned long long) pkt->addr, 99 pkt->ack_freq, 100 (unsigned long long) pkt->mtu); 101 102 pkt->tag.sid = vio_send_sid(vio); 103 104 if (pkt->xfer_mode != VIO_DRING_MODE || 105 pkt->addr_type != VNET_ADDR_ETHERMAC || 106 pkt->mtu != ETH_FRAME_LEN) { 107 viodbg(HS, "SEND NET ATTR NACK\n"); 108 109 pkt->tag.stype = VIO_SUBTYPE_NACK; 110 111 (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); 112 113 return -ECONNRESET; 114 } else { 115 viodbg(HS, "SEND NET ATTR ACK\n"); 116 117 pkt->tag.stype = VIO_SUBTYPE_ACK; 118 119 return vio_ldc_send(vio, pkt, sizeof(*pkt)); 120 } 121 122 } 123 124 static int handle_attr_ack(struct vio_driver_state *vio, 125 struct vio_net_attr_info *pkt) 126 { 127 viodbg(HS, "GOT NET ATTR ACK\n"); 128 129 return 0; 130 } 131 132 static int handle_attr_nack(struct vio_driver_state *vio, 133 struct vio_net_attr_info *pkt) 134 { 135 viodbg(HS, "GOT NET ATTR NACK\n"); 136 137 return -ECONNRESET; 138 } 139 140 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) 141 { 142 struct vio_net_attr_info *pkt = arg; 143 144 switch (pkt->tag.stype) { 145 case VIO_SUBTYPE_INFO: 146 return handle_attr_info(vio, pkt); 147 148 case VIO_SUBTYPE_ACK: 149 return handle_attr_ack(vio, pkt); 150 151 case VIO_SUBTYPE_NACK: 152 return handle_attr_nack(vio, pkt); 153 154 default: 155 return -ECONNRESET; 156 } 157 } 158 159 static void vnet_handshake_complete(struct vio_driver_state *vio) 160 { 161 struct vio_dring_state *dr; 162 163 dr = &vio->drings[VIO_DRIVER_RX_RING]; 164 dr->snd_nxt = dr->rcv_nxt = 1; 165 166 dr = &vio->drings[VIO_DRIVER_TX_RING]; 167 dr->snd_nxt = dr->rcv_nxt = 1; 168 } 169 170 /* The hypervisor interface that implements copying to/from imported 171 * memory from another domain requires that copies are done to 8-byte 172 * aligned buffers, and that the lengths of such copies are also 8-byte 173 * multiples. 174 * 175 * So we align skb->data to an 8-byte multiple and pad-out the data 176 * area so we can round the copy length up to the next multiple of 177 * 8 for the copy. 178 * 179 * The transmitter puts the actual start of the packet 6 bytes into 180 * the buffer it sends over, so that the IP headers after the ethernet 181 * header are aligned properly. These 6 bytes are not in the descriptor 182 * length, they are simply implied. This offset is represented using 183 * the VNET_PACKET_SKIP macro. 184 */ 185 static struct sk_buff *alloc_and_align_skb(struct net_device *dev, 186 unsigned int len) 187 { 188 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); 189 unsigned long addr, off; 190 191 if (unlikely(!skb)) 192 return NULL; 193 194 addr = (unsigned long) skb->data; 195 off = ((addr + 7UL) & ~7UL) - addr; 196 if (off) 197 skb_reserve(skb, off); 198 199 return skb; 200 } 201 202 static int vnet_rx_one(struct vnet_port *port, unsigned int len, 203 struct ldc_trans_cookie *cookies, int ncookies) 204 { 205 struct net_device *dev = port->vp->dev; 206 unsigned int copy_len; 207 struct sk_buff *skb; 208 int err; 209 210 err = -EMSGSIZE; 211 if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) { 212 dev->stats.rx_length_errors++; 213 goto out_dropped; 214 } 215 216 skb = alloc_and_align_skb(dev, len); 217 err = -ENOMEM; 218 if (unlikely(!skb)) { 219 dev->stats.rx_missed_errors++; 220 goto out_dropped; 221 } 222 223 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; 224 skb_put(skb, copy_len); 225 err = ldc_copy(port->vio.lp, LDC_COPY_IN, 226 skb->data, copy_len, 0, 227 cookies, ncookies); 228 if (unlikely(err < 0)) { 229 dev->stats.rx_frame_errors++; 230 goto out_free_skb; 231 } 232 233 skb_pull(skb, VNET_PACKET_SKIP); 234 skb_trim(skb, len); 235 skb->protocol = eth_type_trans(skb, dev); 236 237 dev->stats.rx_packets++; 238 dev->stats.rx_bytes += len; 239 240 netif_rx(skb); 241 242 return 0; 243 244 out_free_skb: 245 kfree_skb(skb); 246 247 out_dropped: 248 dev->stats.rx_dropped++; 249 return err; 250 } 251 252 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, 253 u32 start, u32 end, u8 vio_dring_state) 254 { 255 struct vio_dring_data hdr = { 256 .tag = { 257 .type = VIO_TYPE_DATA, 258 .stype = VIO_SUBTYPE_ACK, 259 .stype_env = VIO_DRING_DATA, 260 .sid = vio_send_sid(&port->vio), 261 }, 262 .dring_ident = dr->ident, 263 .start_idx = start, 264 .end_idx = end, 265 .state = vio_dring_state, 266 }; 267 int err, delay; 268 int retries = 0; 269 270 hdr.seq = dr->snd_nxt; 271 delay = 1; 272 do { 273 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 274 if (err > 0) { 275 dr->snd_nxt++; 276 break; 277 } 278 udelay(delay); 279 if ((delay <<= 1) > 128) 280 delay = 128; 281 if (retries++ > VNET_MAX_RETRIES) { 282 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n", 283 port->raddr[0], port->raddr[1], 284 port->raddr[2], port->raddr[3], 285 port->raddr[4], port->raddr[5]); 286 err = -ECONNRESET; 287 } 288 } while (err == -EAGAIN); 289 290 return err; 291 } 292 293 static u32 next_idx(u32 idx, struct vio_dring_state *dr) 294 { 295 if (++idx == dr->num_entries) 296 idx = 0; 297 return idx; 298 } 299 300 static u32 prev_idx(u32 idx, struct vio_dring_state *dr) 301 { 302 if (idx == 0) 303 idx = dr->num_entries - 1; 304 else 305 idx--; 306 307 return idx; 308 } 309 310 static struct vio_net_desc *get_rx_desc(struct vnet_port *port, 311 struct vio_dring_state *dr, 312 u32 index) 313 { 314 struct vio_net_desc *desc = port->vio.desc_buf; 315 int err; 316 317 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, 318 (index * dr->entry_size), 319 dr->cookies, dr->ncookies); 320 if (err < 0) 321 return ERR_PTR(err); 322 323 return desc; 324 } 325 326 static int put_rx_desc(struct vnet_port *port, 327 struct vio_dring_state *dr, 328 struct vio_net_desc *desc, 329 u32 index) 330 { 331 int err; 332 333 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, 334 (index * dr->entry_size), 335 dr->cookies, dr->ncookies); 336 if (err < 0) 337 return err; 338 339 return 0; 340 } 341 342 static int vnet_walk_rx_one(struct vnet_port *port, 343 struct vio_dring_state *dr, 344 u32 index, int *needs_ack) 345 { 346 struct vio_net_desc *desc = get_rx_desc(port, dr, index); 347 struct vio_driver_state *vio = &port->vio; 348 int err; 349 350 if (IS_ERR(desc)) 351 return PTR_ERR(desc); 352 353 if (desc->hdr.state != VIO_DESC_READY) 354 return 1; 355 356 rmb(); 357 358 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", 359 desc->hdr.state, desc->hdr.ack, 360 desc->size, desc->ncookies, 361 desc->cookies[0].cookie_addr, 362 desc->cookies[0].cookie_size); 363 364 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies); 365 if (err == -ECONNRESET) 366 return err; 367 desc->hdr.state = VIO_DESC_DONE; 368 err = put_rx_desc(port, dr, desc, index); 369 if (err < 0) 370 return err; 371 *needs_ack = desc->hdr.ack; 372 return 0; 373 } 374 375 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, 376 u32 start, u32 end) 377 { 378 struct vio_driver_state *vio = &port->vio; 379 int ack_start = -1, ack_end = -1; 380 381 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr); 382 383 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); 384 385 while (start != end) { 386 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); 387 if (err == -ECONNRESET) 388 return err; 389 if (err != 0) 390 break; 391 if (ack_start == -1) 392 ack_start = start; 393 ack_end = start; 394 start = next_idx(start, dr); 395 if (ack && start != end) { 396 err = vnet_send_ack(port, dr, ack_start, ack_end, 397 VIO_DRING_ACTIVE); 398 if (err == -ECONNRESET) 399 return err; 400 ack_start = -1; 401 } 402 } 403 if (unlikely(ack_start == -1)) 404 ack_start = ack_end = prev_idx(start, dr); 405 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED); 406 } 407 408 static int vnet_rx(struct vnet_port *port, void *msgbuf) 409 { 410 struct vio_dring_data *pkt = msgbuf; 411 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; 412 struct vio_driver_state *vio = &port->vio; 413 414 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", 415 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); 416 417 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 418 return 0; 419 if (unlikely(pkt->seq != dr->rcv_nxt)) { 420 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", 421 pkt->seq, dr->rcv_nxt); 422 return 0; 423 } 424 425 dr->rcv_nxt++; 426 427 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ 428 429 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx); 430 } 431 432 static int idx_is_pending(struct vio_dring_state *dr, u32 end) 433 { 434 u32 idx = dr->cons; 435 int found = 0; 436 437 while (idx != dr->prod) { 438 if (idx == end) { 439 found = 1; 440 break; 441 } 442 idx = next_idx(idx, dr); 443 } 444 return found; 445 } 446 447 static int vnet_ack(struct vnet_port *port, void *msgbuf) 448 { 449 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 450 struct vio_dring_data *pkt = msgbuf; 451 struct net_device *dev; 452 struct vnet *vp; 453 u32 end; 454 455 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 456 return 0; 457 458 end = pkt->end_idx; 459 if (unlikely(!idx_is_pending(dr, end))) 460 return 0; 461 462 dr->cons = next_idx(end, dr); 463 464 vp = port->vp; 465 dev = vp->dev; 466 if (unlikely(netif_queue_stopped(dev) && 467 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) 468 return 1; 469 470 return 0; 471 } 472 473 static int vnet_nack(struct vnet_port *port, void *msgbuf) 474 { 475 /* XXX just reset or similar XXX */ 476 return 0; 477 } 478 479 static int handle_mcast(struct vnet_port *port, void *msgbuf) 480 { 481 struct vio_net_mcast_info *pkt = msgbuf; 482 483 if (pkt->tag.stype != VIO_SUBTYPE_ACK) 484 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", 485 port->vp->dev->name, 486 pkt->tag.type, 487 pkt->tag.stype, 488 pkt->tag.stype_env, 489 pkt->tag.sid); 490 491 return 0; 492 } 493 494 static void maybe_tx_wakeup(unsigned long param) 495 { 496 struct vnet *vp = (struct vnet *)param; 497 struct net_device *dev = vp->dev; 498 499 netif_tx_lock(dev); 500 if (likely(netif_queue_stopped(dev))) { 501 struct vnet_port *port; 502 int wake = 1; 503 504 list_for_each_entry(port, &vp->port_list, list) { 505 struct vio_dring_state *dr; 506 507 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 508 if (vnet_tx_dring_avail(dr) < 509 VNET_TX_WAKEUP_THRESH(dr)) { 510 wake = 0; 511 break; 512 } 513 } 514 if (wake) 515 netif_wake_queue(dev); 516 } 517 netif_tx_unlock(dev); 518 } 519 520 static void vnet_event(void *arg, int event) 521 { 522 struct vnet_port *port = arg; 523 struct vio_driver_state *vio = &port->vio; 524 unsigned long flags; 525 int tx_wakeup, err; 526 527 spin_lock_irqsave(&vio->lock, flags); 528 529 if (unlikely(event == LDC_EVENT_RESET || 530 event == LDC_EVENT_UP)) { 531 vio_link_state_change(vio, event); 532 spin_unlock_irqrestore(&vio->lock, flags); 533 534 if (event == LDC_EVENT_RESET) 535 vio_port_up(vio); 536 return; 537 } 538 539 if (unlikely(event != LDC_EVENT_DATA_READY)) { 540 pr_warning("Unexpected LDC event %d\n", event); 541 spin_unlock_irqrestore(&vio->lock, flags); 542 return; 543 } 544 545 tx_wakeup = err = 0; 546 while (1) { 547 union { 548 struct vio_msg_tag tag; 549 u64 raw[8]; 550 } msgbuf; 551 552 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); 553 if (unlikely(err < 0)) { 554 if (err == -ECONNRESET) 555 vio_conn_reset(vio); 556 break; 557 } 558 if (err == 0) 559 break; 560 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", 561 msgbuf.tag.type, 562 msgbuf.tag.stype, 563 msgbuf.tag.stype_env, 564 msgbuf.tag.sid); 565 err = vio_validate_sid(vio, &msgbuf.tag); 566 if (err < 0) 567 break; 568 569 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { 570 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { 571 err = vnet_rx(port, &msgbuf); 572 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { 573 err = vnet_ack(port, &msgbuf); 574 if (err > 0) 575 tx_wakeup |= err; 576 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { 577 err = vnet_nack(port, &msgbuf); 578 } 579 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { 580 if (msgbuf.tag.stype_env == VNET_MCAST_INFO) 581 err = handle_mcast(port, &msgbuf); 582 else 583 err = vio_control_pkt_engine(vio, &msgbuf); 584 if (err) 585 break; 586 } else { 587 err = vnet_handle_unknown(port, &msgbuf); 588 } 589 if (err == -ECONNRESET) 590 break; 591 } 592 spin_unlock(&vio->lock); 593 /* Kick off a tasklet to wake the queue. We cannot call 594 * maybe_tx_wakeup directly here because we could deadlock on 595 * netif_tx_lock() with dev_watchdog() 596 */ 597 if (unlikely(tx_wakeup && err != -ECONNRESET)) 598 tasklet_schedule(&port->vp->vnet_tx_wakeup); 599 600 local_irq_restore(flags); 601 } 602 603 static int __vnet_tx_trigger(struct vnet_port *port) 604 { 605 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 606 struct vio_dring_data hdr = { 607 .tag = { 608 .type = VIO_TYPE_DATA, 609 .stype = VIO_SUBTYPE_INFO, 610 .stype_env = VIO_DRING_DATA, 611 .sid = vio_send_sid(&port->vio), 612 }, 613 .dring_ident = dr->ident, 614 .start_idx = dr->prod, 615 .end_idx = (u32) -1, 616 }; 617 int err, delay; 618 int retries = 0; 619 620 hdr.seq = dr->snd_nxt; 621 delay = 1; 622 do { 623 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 624 if (err > 0) { 625 dr->snd_nxt++; 626 break; 627 } 628 udelay(delay); 629 if ((delay <<= 1) > 128) 630 delay = 128; 631 if (retries++ > VNET_MAX_RETRIES) 632 break; 633 } while (err == -EAGAIN); 634 635 return err; 636 } 637 638 static inline bool port_is_up(struct vnet_port *vnet) 639 { 640 struct vio_driver_state *vio = &vnet->vio; 641 642 return !!(vio->hs_state & VIO_HS_COMPLETE); 643 } 644 645 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) 646 { 647 unsigned int hash = vnet_hashfn(skb->data); 648 struct hlist_head *hp = &vp->port_hash[hash]; 649 struct vnet_port *port; 650 651 hlist_for_each_entry(port, hp, hash) { 652 if (!port_is_up(port)) 653 continue; 654 if (ether_addr_equal(port->raddr, skb->data)) 655 return port; 656 } 657 list_for_each_entry(port, &vp->port_list, list) { 658 if (!port->switch_port) 659 continue; 660 if (!port_is_up(port)) 661 continue; 662 return port; 663 } 664 return NULL; 665 } 666 667 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb) 668 { 669 struct vnet_port *ret; 670 unsigned long flags; 671 672 spin_lock_irqsave(&vp->lock, flags); 673 ret = __tx_port_find(vp, skb); 674 spin_unlock_irqrestore(&vp->lock, flags); 675 676 return ret; 677 } 678 679 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 680 { 681 struct vnet *vp = netdev_priv(dev); 682 struct vnet_port *port = tx_port_find(vp, skb); 683 struct vio_dring_state *dr; 684 struct vio_net_desc *d; 685 unsigned long flags; 686 unsigned int len; 687 void *tx_buf; 688 int i, err; 689 690 if (unlikely(!port)) 691 goto out_dropped; 692 693 spin_lock_irqsave(&port->vio.lock, flags); 694 695 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 696 if (unlikely(vnet_tx_dring_avail(dr) < 2)) { 697 if (!netif_queue_stopped(dev)) { 698 netif_stop_queue(dev); 699 700 /* This is a hard error, log it. */ 701 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); 702 dev->stats.tx_errors++; 703 } 704 spin_unlock_irqrestore(&port->vio.lock, flags); 705 return NETDEV_TX_BUSY; 706 } 707 708 d = vio_dring_cur(dr); 709 710 tx_buf = port->tx_bufs[dr->prod].buf; 711 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len); 712 713 len = skb->len; 714 if (len < ETH_ZLEN) { 715 len = ETH_ZLEN; 716 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len); 717 } 718 719 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), 720 * thus it is safe to not set VIO_ACK_ENABLE for each transmission: 721 * the protocol itself does not require it as long as the peer 722 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. 723 * 724 * An ACK for every packet in the ring is expensive as the 725 * sending of LDC messages is slow and affects performance. 726 */ 727 d->hdr.ack = VIO_ACK_DISABLE; 728 d->size = len; 729 d->ncookies = port->tx_bufs[dr->prod].ncookies; 730 for (i = 0; i < d->ncookies; i++) 731 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i]; 732 733 /* This has to be a non-SMP write barrier because we are writing 734 * to memory which is shared with the peer LDOM. 735 */ 736 wmb(); 737 738 d->hdr.state = VIO_DESC_READY; 739 740 err = __vnet_tx_trigger(port); 741 if (unlikely(err < 0)) { 742 netdev_info(dev, "TX trigger error %d\n", err); 743 d->hdr.state = VIO_DESC_FREE; 744 dev->stats.tx_carrier_errors++; 745 goto out_dropped_unlock; 746 } 747 748 dev->stats.tx_packets++; 749 dev->stats.tx_bytes += skb->len; 750 751 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); 752 if (unlikely(vnet_tx_dring_avail(dr) < 2)) { 753 netif_stop_queue(dev); 754 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) 755 netif_wake_queue(dev); 756 } 757 758 spin_unlock_irqrestore(&port->vio.lock, flags); 759 760 dev_kfree_skb(skb); 761 762 return NETDEV_TX_OK; 763 764 out_dropped_unlock: 765 spin_unlock_irqrestore(&port->vio.lock, flags); 766 767 out_dropped: 768 dev_kfree_skb(skb); 769 dev->stats.tx_dropped++; 770 return NETDEV_TX_OK; 771 } 772 773 static void vnet_tx_timeout(struct net_device *dev) 774 { 775 /* XXX Implement me XXX */ 776 } 777 778 static int vnet_open(struct net_device *dev) 779 { 780 netif_carrier_on(dev); 781 netif_start_queue(dev); 782 783 return 0; 784 } 785 786 static int vnet_close(struct net_device *dev) 787 { 788 netif_stop_queue(dev); 789 netif_carrier_off(dev); 790 791 return 0; 792 } 793 794 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) 795 { 796 struct vnet_mcast_entry *m; 797 798 for (m = vp->mcast_list; m; m = m->next) { 799 if (ether_addr_equal(m->addr, addr)) 800 return m; 801 } 802 return NULL; 803 } 804 805 static void __update_mc_list(struct vnet *vp, struct net_device *dev) 806 { 807 struct netdev_hw_addr *ha; 808 809 netdev_for_each_mc_addr(ha, dev) { 810 struct vnet_mcast_entry *m; 811 812 m = __vnet_mc_find(vp, ha->addr); 813 if (m) { 814 m->hit = 1; 815 continue; 816 } 817 818 if (!m) { 819 m = kzalloc(sizeof(*m), GFP_ATOMIC); 820 if (!m) 821 continue; 822 memcpy(m->addr, ha->addr, ETH_ALEN); 823 m->hit = 1; 824 825 m->next = vp->mcast_list; 826 vp->mcast_list = m; 827 } 828 } 829 } 830 831 static void __send_mc_list(struct vnet *vp, struct vnet_port *port) 832 { 833 struct vio_net_mcast_info info; 834 struct vnet_mcast_entry *m, **pp; 835 int n_addrs; 836 837 memset(&info, 0, sizeof(info)); 838 839 info.tag.type = VIO_TYPE_CTRL; 840 info.tag.stype = VIO_SUBTYPE_INFO; 841 info.tag.stype_env = VNET_MCAST_INFO; 842 info.tag.sid = vio_send_sid(&port->vio); 843 info.set = 1; 844 845 n_addrs = 0; 846 for (m = vp->mcast_list; m; m = m->next) { 847 if (m->sent) 848 continue; 849 m->sent = 1; 850 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 851 m->addr, ETH_ALEN); 852 if (++n_addrs == VNET_NUM_MCAST) { 853 info.count = n_addrs; 854 855 (void) vio_ldc_send(&port->vio, &info, 856 sizeof(info)); 857 n_addrs = 0; 858 } 859 } 860 if (n_addrs) { 861 info.count = n_addrs; 862 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 863 } 864 865 info.set = 0; 866 867 n_addrs = 0; 868 pp = &vp->mcast_list; 869 while ((m = *pp) != NULL) { 870 if (m->hit) { 871 m->hit = 0; 872 pp = &m->next; 873 continue; 874 } 875 876 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 877 m->addr, ETH_ALEN); 878 if (++n_addrs == VNET_NUM_MCAST) { 879 info.count = n_addrs; 880 (void) vio_ldc_send(&port->vio, &info, 881 sizeof(info)); 882 n_addrs = 0; 883 } 884 885 *pp = m->next; 886 kfree(m); 887 } 888 if (n_addrs) { 889 info.count = n_addrs; 890 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 891 } 892 } 893 894 static void vnet_set_rx_mode(struct net_device *dev) 895 { 896 struct vnet *vp = netdev_priv(dev); 897 struct vnet_port *port; 898 unsigned long flags; 899 900 spin_lock_irqsave(&vp->lock, flags); 901 if (!list_empty(&vp->port_list)) { 902 port = list_entry(vp->port_list.next, struct vnet_port, list); 903 904 if (port->switch_port) { 905 __update_mc_list(vp, dev); 906 __send_mc_list(vp, port); 907 } 908 } 909 spin_unlock_irqrestore(&vp->lock, flags); 910 } 911 912 static int vnet_change_mtu(struct net_device *dev, int new_mtu) 913 { 914 if (new_mtu != ETH_DATA_LEN) 915 return -EINVAL; 916 917 dev->mtu = new_mtu; 918 return 0; 919 } 920 921 static int vnet_set_mac_addr(struct net_device *dev, void *p) 922 { 923 return -EINVAL; 924 } 925 926 static void vnet_get_drvinfo(struct net_device *dev, 927 struct ethtool_drvinfo *info) 928 { 929 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 930 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 931 } 932 933 static u32 vnet_get_msglevel(struct net_device *dev) 934 { 935 struct vnet *vp = netdev_priv(dev); 936 return vp->msg_enable; 937 } 938 939 static void vnet_set_msglevel(struct net_device *dev, u32 value) 940 { 941 struct vnet *vp = netdev_priv(dev); 942 vp->msg_enable = value; 943 } 944 945 static const struct ethtool_ops vnet_ethtool_ops = { 946 .get_drvinfo = vnet_get_drvinfo, 947 .get_msglevel = vnet_get_msglevel, 948 .set_msglevel = vnet_set_msglevel, 949 .get_link = ethtool_op_get_link, 950 }; 951 952 static void vnet_port_free_tx_bufs(struct vnet_port *port) 953 { 954 struct vio_dring_state *dr; 955 int i; 956 957 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 958 if (dr->base) { 959 ldc_free_exp_dring(port->vio.lp, dr->base, 960 (dr->entry_size * dr->num_entries), 961 dr->cookies, dr->ncookies); 962 dr->base = NULL; 963 dr->entry_size = 0; 964 dr->num_entries = 0; 965 dr->pending = 0; 966 dr->ncookies = 0; 967 } 968 969 for (i = 0; i < VNET_TX_RING_SIZE; i++) { 970 void *buf = port->tx_bufs[i].buf; 971 972 if (!buf) 973 continue; 974 975 ldc_unmap(port->vio.lp, 976 port->tx_bufs[i].cookies, 977 port->tx_bufs[i].ncookies); 978 979 kfree(buf); 980 port->tx_bufs[i].buf = NULL; 981 } 982 } 983 984 static int vnet_port_alloc_tx_bufs(struct vnet_port *port) 985 { 986 struct vio_dring_state *dr; 987 unsigned long len; 988 int i, err, ncookies; 989 void *dring; 990 991 for (i = 0; i < VNET_TX_RING_SIZE; i++) { 992 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL); 993 int map_len = (ETH_FRAME_LEN + 7) & ~7; 994 995 err = -ENOMEM; 996 if (!buf) 997 goto err_out; 998 999 err = -EFAULT; 1000 if ((unsigned long)buf & (8UL - 1)) { 1001 pr_err("TX buffer misaligned\n"); 1002 kfree(buf); 1003 goto err_out; 1004 } 1005 1006 err = ldc_map_single(port->vio.lp, buf, map_len, 1007 port->tx_bufs[i].cookies, 2, 1008 (LDC_MAP_SHADOW | 1009 LDC_MAP_DIRECT | 1010 LDC_MAP_RW)); 1011 if (err < 0) { 1012 kfree(buf); 1013 goto err_out; 1014 } 1015 port->tx_bufs[i].buf = buf; 1016 port->tx_bufs[i].ncookies = err; 1017 } 1018 1019 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1020 1021 len = (VNET_TX_RING_SIZE * 1022 (sizeof(struct vio_net_desc) + 1023 (sizeof(struct ldc_trans_cookie) * 2))); 1024 1025 ncookies = VIO_MAX_RING_COOKIES; 1026 dring = ldc_alloc_exp_dring(port->vio.lp, len, 1027 dr->cookies, &ncookies, 1028 (LDC_MAP_SHADOW | 1029 LDC_MAP_DIRECT | 1030 LDC_MAP_RW)); 1031 if (IS_ERR(dring)) { 1032 err = PTR_ERR(dring); 1033 goto err_out; 1034 } 1035 1036 dr->base = dring; 1037 dr->entry_size = (sizeof(struct vio_net_desc) + 1038 (sizeof(struct ldc_trans_cookie) * 2)); 1039 dr->num_entries = VNET_TX_RING_SIZE; 1040 dr->prod = dr->cons = 0; 1041 dr->pending = VNET_TX_RING_SIZE; 1042 dr->ncookies = ncookies; 1043 1044 return 0; 1045 1046 err_out: 1047 vnet_port_free_tx_bufs(port); 1048 1049 return err; 1050 } 1051 1052 static LIST_HEAD(vnet_list); 1053 static DEFINE_MUTEX(vnet_list_mutex); 1054 1055 static const struct net_device_ops vnet_ops = { 1056 .ndo_open = vnet_open, 1057 .ndo_stop = vnet_close, 1058 .ndo_set_rx_mode = vnet_set_rx_mode, 1059 .ndo_set_mac_address = vnet_set_mac_addr, 1060 .ndo_validate_addr = eth_validate_addr, 1061 .ndo_tx_timeout = vnet_tx_timeout, 1062 .ndo_change_mtu = vnet_change_mtu, 1063 .ndo_start_xmit = vnet_start_xmit, 1064 }; 1065 1066 static struct vnet *vnet_new(const u64 *local_mac) 1067 { 1068 struct net_device *dev; 1069 struct vnet *vp; 1070 int err, i; 1071 1072 dev = alloc_etherdev(sizeof(*vp)); 1073 if (!dev) 1074 return ERR_PTR(-ENOMEM); 1075 1076 for (i = 0; i < ETH_ALEN; i++) 1077 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 1078 1079 vp = netdev_priv(dev); 1080 1081 spin_lock_init(&vp->lock); 1082 tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp); 1083 vp->dev = dev; 1084 1085 INIT_LIST_HEAD(&vp->port_list); 1086 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 1087 INIT_HLIST_HEAD(&vp->port_hash[i]); 1088 INIT_LIST_HEAD(&vp->list); 1089 vp->local_mac = *local_mac; 1090 1091 dev->netdev_ops = &vnet_ops; 1092 dev->ethtool_ops = &vnet_ethtool_ops; 1093 dev->watchdog_timeo = VNET_TX_TIMEOUT; 1094 1095 err = register_netdev(dev); 1096 if (err) { 1097 pr_err("Cannot register net device, aborting\n"); 1098 goto err_out_free_dev; 1099 } 1100 1101 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 1102 1103 list_add(&vp->list, &vnet_list); 1104 1105 return vp; 1106 1107 err_out_free_dev: 1108 free_netdev(dev); 1109 1110 return ERR_PTR(err); 1111 } 1112 1113 static struct vnet *vnet_find_or_create(const u64 *local_mac) 1114 { 1115 struct vnet *iter, *vp; 1116 1117 mutex_lock(&vnet_list_mutex); 1118 vp = NULL; 1119 list_for_each_entry(iter, &vnet_list, list) { 1120 if (iter->local_mac == *local_mac) { 1121 vp = iter; 1122 break; 1123 } 1124 } 1125 if (!vp) 1126 vp = vnet_new(local_mac); 1127 mutex_unlock(&vnet_list_mutex); 1128 1129 return vp; 1130 } 1131 1132 static void vnet_cleanup(void) 1133 { 1134 struct vnet *vp; 1135 struct net_device *dev; 1136 1137 mutex_lock(&vnet_list_mutex); 1138 while (!list_empty(&vnet_list)) { 1139 vp = list_first_entry(&vnet_list, struct vnet, list); 1140 list_del(&vp->list); 1141 dev = vp->dev; 1142 tasklet_kill(&vp->vnet_tx_wakeup); 1143 /* vio_unregister_driver() should have cleaned up port_list */ 1144 BUG_ON(!list_empty(&vp->port_list)); 1145 unregister_netdev(dev); 1146 free_netdev(dev); 1147 } 1148 mutex_unlock(&vnet_list_mutex); 1149 } 1150 1151 static const char *local_mac_prop = "local-mac-address"; 1152 1153 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 1154 u64 port_node) 1155 { 1156 const u64 *local_mac = NULL; 1157 u64 a; 1158 1159 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 1160 u64 target = mdesc_arc_target(hp, a); 1161 const char *name; 1162 1163 name = mdesc_get_property(hp, target, "name", NULL); 1164 if (!name || strcmp(name, "network")) 1165 continue; 1166 1167 local_mac = mdesc_get_property(hp, target, 1168 local_mac_prop, NULL); 1169 if (local_mac) 1170 break; 1171 } 1172 if (!local_mac) 1173 return ERR_PTR(-ENODEV); 1174 1175 return vnet_find_or_create(local_mac); 1176 } 1177 1178 static struct ldc_channel_config vnet_ldc_cfg = { 1179 .event = vnet_event, 1180 .mtu = 64, 1181 .mode = LDC_MODE_UNRELIABLE, 1182 }; 1183 1184 static struct vio_driver_ops vnet_vio_ops = { 1185 .send_attr = vnet_send_attr, 1186 .handle_attr = vnet_handle_attr, 1187 .handshake_complete = vnet_handshake_complete, 1188 }; 1189 1190 static void print_version(void) 1191 { 1192 printk_once(KERN_INFO "%s", version); 1193 } 1194 1195 const char *remote_macaddr_prop = "remote-mac-address"; 1196 1197 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1198 { 1199 struct mdesc_handle *hp; 1200 struct vnet_port *port; 1201 unsigned long flags; 1202 struct vnet *vp; 1203 const u64 *rmac; 1204 int len, i, err, switch_port; 1205 1206 print_version(); 1207 1208 hp = mdesc_grab(); 1209 1210 vp = vnet_find_parent(hp, vdev->mp); 1211 if (IS_ERR(vp)) { 1212 pr_err("Cannot find port parent vnet\n"); 1213 err = PTR_ERR(vp); 1214 goto err_out_put_mdesc; 1215 } 1216 1217 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 1218 err = -ENODEV; 1219 if (!rmac) { 1220 pr_err("Port lacks %s property\n", remote_macaddr_prop); 1221 goto err_out_put_mdesc; 1222 } 1223 1224 port = kzalloc(sizeof(*port), GFP_KERNEL); 1225 err = -ENOMEM; 1226 if (!port) 1227 goto err_out_put_mdesc; 1228 1229 for (i = 0; i < ETH_ALEN; i++) 1230 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 1231 1232 port->vp = vp; 1233 1234 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 1235 vnet_versions, ARRAY_SIZE(vnet_versions), 1236 &vnet_vio_ops, vp->dev->name); 1237 if (err) 1238 goto err_out_free_port; 1239 1240 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 1241 if (err) 1242 goto err_out_free_port; 1243 1244 err = vnet_port_alloc_tx_bufs(port); 1245 if (err) 1246 goto err_out_free_ldc; 1247 1248 INIT_HLIST_NODE(&port->hash); 1249 INIT_LIST_HEAD(&port->list); 1250 1251 switch_port = 0; 1252 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) 1253 switch_port = 1; 1254 port->switch_port = switch_port; 1255 1256 spin_lock_irqsave(&vp->lock, flags); 1257 if (switch_port) 1258 list_add(&port->list, &vp->port_list); 1259 else 1260 list_add_tail(&port->list, &vp->port_list); 1261 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]); 1262 spin_unlock_irqrestore(&vp->lock, flags); 1263 1264 dev_set_drvdata(&vdev->dev, port); 1265 1266 pr_info("%s: PORT ( remote-mac %pM%s )\n", 1267 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 1268 1269 vio_port_up(&port->vio); 1270 1271 mdesc_release(hp); 1272 1273 return 0; 1274 1275 err_out_free_ldc: 1276 vio_ldc_free(&port->vio); 1277 1278 err_out_free_port: 1279 kfree(port); 1280 1281 err_out_put_mdesc: 1282 mdesc_release(hp); 1283 return err; 1284 } 1285 1286 static int vnet_port_remove(struct vio_dev *vdev) 1287 { 1288 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 1289 1290 if (port) { 1291 struct vnet *vp = port->vp; 1292 unsigned long flags; 1293 1294 del_timer_sync(&port->vio.timer); 1295 1296 spin_lock_irqsave(&vp->lock, flags); 1297 list_del(&port->list); 1298 hlist_del(&port->hash); 1299 spin_unlock_irqrestore(&vp->lock, flags); 1300 1301 vnet_port_free_tx_bufs(port); 1302 vio_ldc_free(&port->vio); 1303 1304 dev_set_drvdata(&vdev->dev, NULL); 1305 1306 kfree(port); 1307 1308 } 1309 return 0; 1310 } 1311 1312 static const struct vio_device_id vnet_port_match[] = { 1313 { 1314 .type = "vnet-port", 1315 }, 1316 {}, 1317 }; 1318 MODULE_DEVICE_TABLE(vio, vnet_port_match); 1319 1320 static struct vio_driver vnet_port_driver = { 1321 .id_table = vnet_port_match, 1322 .probe = vnet_port_probe, 1323 .remove = vnet_port_remove, 1324 .name = "vnet_port", 1325 }; 1326 1327 static int __init vnet_init(void) 1328 { 1329 return vio_register_driver(&vnet_port_driver); 1330 } 1331 1332 static void __exit vnet_exit(void) 1333 { 1334 vio_unregister_driver(&vnet_port_driver); 1335 vnet_cleanup(); 1336 } 1337 1338 module_init(vnet_init); 1339 module_exit(vnet_exit); 1340