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 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", 354 desc->hdr.state, desc->hdr.ack, 355 desc->size, desc->ncookies, 356 desc->cookies[0].cookie_addr, 357 desc->cookies[0].cookie_size); 358 359 if (desc->hdr.state != VIO_DESC_READY) 360 return 1; 361 err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies); 362 if (err == -ECONNRESET) 363 return err; 364 desc->hdr.state = VIO_DESC_DONE; 365 err = put_rx_desc(port, dr, desc, index); 366 if (err < 0) 367 return err; 368 *needs_ack = desc->hdr.ack; 369 return 0; 370 } 371 372 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, 373 u32 start, u32 end) 374 { 375 struct vio_driver_state *vio = &port->vio; 376 int ack_start = -1, ack_end = -1; 377 378 end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr); 379 380 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); 381 382 while (start != end) { 383 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); 384 if (err == -ECONNRESET) 385 return err; 386 if (err != 0) 387 break; 388 if (ack_start == -1) 389 ack_start = start; 390 ack_end = start; 391 start = next_idx(start, dr); 392 if (ack && start != end) { 393 err = vnet_send_ack(port, dr, ack_start, ack_end, 394 VIO_DRING_ACTIVE); 395 if (err == -ECONNRESET) 396 return err; 397 ack_start = -1; 398 } 399 } 400 if (unlikely(ack_start == -1)) 401 ack_start = ack_end = prev_idx(start, dr); 402 return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED); 403 } 404 405 static int vnet_rx(struct vnet_port *port, void *msgbuf) 406 { 407 struct vio_dring_data *pkt = msgbuf; 408 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; 409 struct vio_driver_state *vio = &port->vio; 410 411 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", 412 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); 413 414 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 415 return 0; 416 if (unlikely(pkt->seq != dr->rcv_nxt)) { 417 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", 418 pkt->seq, dr->rcv_nxt); 419 return 0; 420 } 421 422 dr->rcv_nxt++; 423 424 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ 425 426 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx); 427 } 428 429 static int idx_is_pending(struct vio_dring_state *dr, u32 end) 430 { 431 u32 idx = dr->cons; 432 int found = 0; 433 434 while (idx != dr->prod) { 435 if (idx == end) { 436 found = 1; 437 break; 438 } 439 idx = next_idx(idx, dr); 440 } 441 return found; 442 } 443 444 static int vnet_ack(struct vnet_port *port, void *msgbuf) 445 { 446 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 447 struct vio_dring_data *pkt = msgbuf; 448 struct net_device *dev; 449 struct vnet *vp; 450 u32 end; 451 452 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 453 return 0; 454 455 end = pkt->end_idx; 456 if (unlikely(!idx_is_pending(dr, end))) 457 return 0; 458 459 dr->cons = next_idx(end, dr); 460 461 vp = port->vp; 462 dev = vp->dev; 463 if (unlikely(netif_queue_stopped(dev) && 464 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) 465 return 1; 466 467 return 0; 468 } 469 470 static int vnet_nack(struct vnet_port *port, void *msgbuf) 471 { 472 /* XXX just reset or similar XXX */ 473 return 0; 474 } 475 476 static int handle_mcast(struct vnet_port *port, void *msgbuf) 477 { 478 struct vio_net_mcast_info *pkt = msgbuf; 479 480 if (pkt->tag.stype != VIO_SUBTYPE_ACK) 481 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", 482 port->vp->dev->name, 483 pkt->tag.type, 484 pkt->tag.stype, 485 pkt->tag.stype_env, 486 pkt->tag.sid); 487 488 return 0; 489 } 490 491 static void maybe_tx_wakeup(unsigned long param) 492 { 493 struct vnet *vp = (struct vnet *)param; 494 struct net_device *dev = vp->dev; 495 496 netif_tx_lock(dev); 497 if (likely(netif_queue_stopped(dev))) { 498 struct vnet_port *port; 499 int wake = 1; 500 501 list_for_each_entry(port, &vp->port_list, list) { 502 struct vio_dring_state *dr; 503 504 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 505 if (vnet_tx_dring_avail(dr) < 506 VNET_TX_WAKEUP_THRESH(dr)) { 507 wake = 0; 508 break; 509 } 510 } 511 if (wake) 512 netif_wake_queue(dev); 513 } 514 netif_tx_unlock(dev); 515 } 516 517 static void vnet_event(void *arg, int event) 518 { 519 struct vnet_port *port = arg; 520 struct vio_driver_state *vio = &port->vio; 521 unsigned long flags; 522 int tx_wakeup, err; 523 524 spin_lock_irqsave(&vio->lock, flags); 525 526 if (unlikely(event == LDC_EVENT_RESET || 527 event == LDC_EVENT_UP)) { 528 vio_link_state_change(vio, event); 529 spin_unlock_irqrestore(&vio->lock, flags); 530 531 if (event == LDC_EVENT_RESET) 532 vio_port_up(vio); 533 return; 534 } 535 536 if (unlikely(event != LDC_EVENT_DATA_READY)) { 537 pr_warning("Unexpected LDC event %d\n", event); 538 spin_unlock_irqrestore(&vio->lock, flags); 539 return; 540 } 541 542 tx_wakeup = err = 0; 543 while (1) { 544 union { 545 struct vio_msg_tag tag; 546 u64 raw[8]; 547 } msgbuf; 548 549 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); 550 if (unlikely(err < 0)) { 551 if (err == -ECONNRESET) 552 vio_conn_reset(vio); 553 break; 554 } 555 if (err == 0) 556 break; 557 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", 558 msgbuf.tag.type, 559 msgbuf.tag.stype, 560 msgbuf.tag.stype_env, 561 msgbuf.tag.sid); 562 err = vio_validate_sid(vio, &msgbuf.tag); 563 if (err < 0) 564 break; 565 566 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { 567 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { 568 err = vnet_rx(port, &msgbuf); 569 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { 570 err = vnet_ack(port, &msgbuf); 571 if (err > 0) 572 tx_wakeup |= err; 573 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { 574 err = vnet_nack(port, &msgbuf); 575 } 576 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { 577 if (msgbuf.tag.stype_env == VNET_MCAST_INFO) 578 err = handle_mcast(port, &msgbuf); 579 else 580 err = vio_control_pkt_engine(vio, &msgbuf); 581 if (err) 582 break; 583 } else { 584 err = vnet_handle_unknown(port, &msgbuf); 585 } 586 if (err == -ECONNRESET) 587 break; 588 } 589 spin_unlock(&vio->lock); 590 /* Kick off a tasklet to wake the queue. We cannot call 591 * maybe_tx_wakeup directly here because we could deadlock on 592 * netif_tx_lock() with dev_watchdog() 593 */ 594 if (unlikely(tx_wakeup && err != -ECONNRESET)) 595 tasklet_schedule(&port->vp->vnet_tx_wakeup); 596 597 local_irq_restore(flags); 598 } 599 600 static int __vnet_tx_trigger(struct vnet_port *port) 601 { 602 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 603 struct vio_dring_data hdr = { 604 .tag = { 605 .type = VIO_TYPE_DATA, 606 .stype = VIO_SUBTYPE_INFO, 607 .stype_env = VIO_DRING_DATA, 608 .sid = vio_send_sid(&port->vio), 609 }, 610 .dring_ident = dr->ident, 611 .start_idx = dr->prod, 612 .end_idx = (u32) -1, 613 }; 614 int err, delay; 615 int retries = 0; 616 617 hdr.seq = dr->snd_nxt; 618 delay = 1; 619 do { 620 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 621 if (err > 0) { 622 dr->snd_nxt++; 623 break; 624 } 625 udelay(delay); 626 if ((delay <<= 1) > 128) 627 delay = 128; 628 if (retries++ > VNET_MAX_RETRIES) 629 break; 630 } while (err == -EAGAIN); 631 632 return err; 633 } 634 635 static inline bool port_is_up(struct vnet_port *vnet) 636 { 637 struct vio_driver_state *vio = &vnet->vio; 638 639 return !!(vio->hs_state & VIO_HS_COMPLETE); 640 } 641 642 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) 643 { 644 unsigned int hash = vnet_hashfn(skb->data); 645 struct hlist_head *hp = &vp->port_hash[hash]; 646 struct vnet_port *port; 647 648 hlist_for_each_entry(port, hp, hash) { 649 if (!port_is_up(port)) 650 continue; 651 if (ether_addr_equal(port->raddr, skb->data)) 652 return port; 653 } 654 list_for_each_entry(port, &vp->port_list, list) { 655 if (!port->switch_port) 656 continue; 657 if (!port_is_up(port)) 658 continue; 659 return port; 660 } 661 return NULL; 662 } 663 664 struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb) 665 { 666 struct vnet_port *ret; 667 unsigned long flags; 668 669 spin_lock_irqsave(&vp->lock, flags); 670 ret = __tx_port_find(vp, skb); 671 spin_unlock_irqrestore(&vp->lock, flags); 672 673 return ret; 674 } 675 676 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 677 { 678 struct vnet *vp = netdev_priv(dev); 679 struct vnet_port *port = tx_port_find(vp, skb); 680 struct vio_dring_state *dr; 681 struct vio_net_desc *d; 682 unsigned long flags; 683 unsigned int len; 684 void *tx_buf; 685 int i, err; 686 687 if (unlikely(!port)) 688 goto out_dropped; 689 690 spin_lock_irqsave(&port->vio.lock, flags); 691 692 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 693 if (unlikely(vnet_tx_dring_avail(dr) < 2)) { 694 if (!netif_queue_stopped(dev)) { 695 netif_stop_queue(dev); 696 697 /* This is a hard error, log it. */ 698 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); 699 dev->stats.tx_errors++; 700 } 701 spin_unlock_irqrestore(&port->vio.lock, flags); 702 return NETDEV_TX_BUSY; 703 } 704 705 d = vio_dring_cur(dr); 706 707 tx_buf = port->tx_bufs[dr->prod].buf; 708 skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len); 709 710 len = skb->len; 711 if (len < ETH_ZLEN) { 712 len = ETH_ZLEN; 713 memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len); 714 } 715 716 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), 717 * thus it is safe to not set VIO_ACK_ENABLE for each transmission: 718 * the protocol itself does not require it as long as the peer 719 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. 720 * 721 * An ACK for every packet in the ring is expensive as the 722 * sending of LDC messages is slow and affects performance. 723 */ 724 d->hdr.ack = VIO_ACK_DISABLE; 725 d->size = len; 726 d->ncookies = port->tx_bufs[dr->prod].ncookies; 727 for (i = 0; i < d->ncookies; i++) 728 d->cookies[i] = port->tx_bufs[dr->prod].cookies[i]; 729 730 /* This has to be a non-SMP write barrier because we are writing 731 * to memory which is shared with the peer LDOM. 732 */ 733 wmb(); 734 735 d->hdr.state = VIO_DESC_READY; 736 737 err = __vnet_tx_trigger(port); 738 if (unlikely(err < 0)) { 739 netdev_info(dev, "TX trigger error %d\n", err); 740 d->hdr.state = VIO_DESC_FREE; 741 dev->stats.tx_carrier_errors++; 742 goto out_dropped_unlock; 743 } 744 745 dev->stats.tx_packets++; 746 dev->stats.tx_bytes += skb->len; 747 748 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); 749 if (unlikely(vnet_tx_dring_avail(dr) < 2)) { 750 netif_stop_queue(dev); 751 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) 752 netif_wake_queue(dev); 753 } 754 755 spin_unlock_irqrestore(&port->vio.lock, flags); 756 757 dev_kfree_skb(skb); 758 759 return NETDEV_TX_OK; 760 761 out_dropped_unlock: 762 spin_unlock_irqrestore(&port->vio.lock, flags); 763 764 out_dropped: 765 dev_kfree_skb(skb); 766 dev->stats.tx_dropped++; 767 return NETDEV_TX_OK; 768 } 769 770 static void vnet_tx_timeout(struct net_device *dev) 771 { 772 /* XXX Implement me XXX */ 773 } 774 775 static int vnet_open(struct net_device *dev) 776 { 777 netif_carrier_on(dev); 778 netif_start_queue(dev); 779 780 return 0; 781 } 782 783 static int vnet_close(struct net_device *dev) 784 { 785 netif_stop_queue(dev); 786 netif_carrier_off(dev); 787 788 return 0; 789 } 790 791 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) 792 { 793 struct vnet_mcast_entry *m; 794 795 for (m = vp->mcast_list; m; m = m->next) { 796 if (ether_addr_equal(m->addr, addr)) 797 return m; 798 } 799 return NULL; 800 } 801 802 static void __update_mc_list(struct vnet *vp, struct net_device *dev) 803 { 804 struct netdev_hw_addr *ha; 805 806 netdev_for_each_mc_addr(ha, dev) { 807 struct vnet_mcast_entry *m; 808 809 m = __vnet_mc_find(vp, ha->addr); 810 if (m) { 811 m->hit = 1; 812 continue; 813 } 814 815 if (!m) { 816 m = kzalloc(sizeof(*m), GFP_ATOMIC); 817 if (!m) 818 continue; 819 memcpy(m->addr, ha->addr, ETH_ALEN); 820 m->hit = 1; 821 822 m->next = vp->mcast_list; 823 vp->mcast_list = m; 824 } 825 } 826 } 827 828 static void __send_mc_list(struct vnet *vp, struct vnet_port *port) 829 { 830 struct vio_net_mcast_info info; 831 struct vnet_mcast_entry *m, **pp; 832 int n_addrs; 833 834 memset(&info, 0, sizeof(info)); 835 836 info.tag.type = VIO_TYPE_CTRL; 837 info.tag.stype = VIO_SUBTYPE_INFO; 838 info.tag.stype_env = VNET_MCAST_INFO; 839 info.tag.sid = vio_send_sid(&port->vio); 840 info.set = 1; 841 842 n_addrs = 0; 843 for (m = vp->mcast_list; m; m = m->next) { 844 if (m->sent) 845 continue; 846 m->sent = 1; 847 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 848 m->addr, ETH_ALEN); 849 if (++n_addrs == VNET_NUM_MCAST) { 850 info.count = n_addrs; 851 852 (void) vio_ldc_send(&port->vio, &info, 853 sizeof(info)); 854 n_addrs = 0; 855 } 856 } 857 if (n_addrs) { 858 info.count = n_addrs; 859 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 860 } 861 862 info.set = 0; 863 864 n_addrs = 0; 865 pp = &vp->mcast_list; 866 while ((m = *pp) != NULL) { 867 if (m->hit) { 868 m->hit = 0; 869 pp = &m->next; 870 continue; 871 } 872 873 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 874 m->addr, ETH_ALEN); 875 if (++n_addrs == VNET_NUM_MCAST) { 876 info.count = n_addrs; 877 (void) vio_ldc_send(&port->vio, &info, 878 sizeof(info)); 879 n_addrs = 0; 880 } 881 882 *pp = m->next; 883 kfree(m); 884 } 885 if (n_addrs) { 886 info.count = n_addrs; 887 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 888 } 889 } 890 891 static void vnet_set_rx_mode(struct net_device *dev) 892 { 893 struct vnet *vp = netdev_priv(dev); 894 struct vnet_port *port; 895 unsigned long flags; 896 897 spin_lock_irqsave(&vp->lock, flags); 898 if (!list_empty(&vp->port_list)) { 899 port = list_entry(vp->port_list.next, struct vnet_port, list); 900 901 if (port->switch_port) { 902 __update_mc_list(vp, dev); 903 __send_mc_list(vp, port); 904 } 905 } 906 spin_unlock_irqrestore(&vp->lock, flags); 907 } 908 909 static int vnet_change_mtu(struct net_device *dev, int new_mtu) 910 { 911 if (new_mtu != ETH_DATA_LEN) 912 return -EINVAL; 913 914 dev->mtu = new_mtu; 915 return 0; 916 } 917 918 static int vnet_set_mac_addr(struct net_device *dev, void *p) 919 { 920 return -EINVAL; 921 } 922 923 static void vnet_get_drvinfo(struct net_device *dev, 924 struct ethtool_drvinfo *info) 925 { 926 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 927 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 928 } 929 930 static u32 vnet_get_msglevel(struct net_device *dev) 931 { 932 struct vnet *vp = netdev_priv(dev); 933 return vp->msg_enable; 934 } 935 936 static void vnet_set_msglevel(struct net_device *dev, u32 value) 937 { 938 struct vnet *vp = netdev_priv(dev); 939 vp->msg_enable = value; 940 } 941 942 static const struct ethtool_ops vnet_ethtool_ops = { 943 .get_drvinfo = vnet_get_drvinfo, 944 .get_msglevel = vnet_get_msglevel, 945 .set_msglevel = vnet_set_msglevel, 946 .get_link = ethtool_op_get_link, 947 }; 948 949 static void vnet_port_free_tx_bufs(struct vnet_port *port) 950 { 951 struct vio_dring_state *dr; 952 int i; 953 954 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 955 if (dr->base) { 956 ldc_free_exp_dring(port->vio.lp, dr->base, 957 (dr->entry_size * dr->num_entries), 958 dr->cookies, dr->ncookies); 959 dr->base = NULL; 960 dr->entry_size = 0; 961 dr->num_entries = 0; 962 dr->pending = 0; 963 dr->ncookies = 0; 964 } 965 966 for (i = 0; i < VNET_TX_RING_SIZE; i++) { 967 void *buf = port->tx_bufs[i].buf; 968 969 if (!buf) 970 continue; 971 972 ldc_unmap(port->vio.lp, 973 port->tx_bufs[i].cookies, 974 port->tx_bufs[i].ncookies); 975 976 kfree(buf); 977 port->tx_bufs[i].buf = NULL; 978 } 979 } 980 981 static int vnet_port_alloc_tx_bufs(struct vnet_port *port) 982 { 983 struct vio_dring_state *dr; 984 unsigned long len; 985 int i, err, ncookies; 986 void *dring; 987 988 for (i = 0; i < VNET_TX_RING_SIZE; i++) { 989 void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL); 990 int map_len = (ETH_FRAME_LEN + 7) & ~7; 991 992 err = -ENOMEM; 993 if (!buf) 994 goto err_out; 995 996 err = -EFAULT; 997 if ((unsigned long)buf & (8UL - 1)) { 998 pr_err("TX buffer misaligned\n"); 999 kfree(buf); 1000 goto err_out; 1001 } 1002 1003 err = ldc_map_single(port->vio.lp, buf, map_len, 1004 port->tx_bufs[i].cookies, 2, 1005 (LDC_MAP_SHADOW | 1006 LDC_MAP_DIRECT | 1007 LDC_MAP_RW)); 1008 if (err < 0) { 1009 kfree(buf); 1010 goto err_out; 1011 } 1012 port->tx_bufs[i].buf = buf; 1013 port->tx_bufs[i].ncookies = err; 1014 } 1015 1016 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1017 1018 len = (VNET_TX_RING_SIZE * 1019 (sizeof(struct vio_net_desc) + 1020 (sizeof(struct ldc_trans_cookie) * 2))); 1021 1022 ncookies = VIO_MAX_RING_COOKIES; 1023 dring = ldc_alloc_exp_dring(port->vio.lp, len, 1024 dr->cookies, &ncookies, 1025 (LDC_MAP_SHADOW | 1026 LDC_MAP_DIRECT | 1027 LDC_MAP_RW)); 1028 if (IS_ERR(dring)) { 1029 err = PTR_ERR(dring); 1030 goto err_out; 1031 } 1032 1033 dr->base = dring; 1034 dr->entry_size = (sizeof(struct vio_net_desc) + 1035 (sizeof(struct ldc_trans_cookie) * 2)); 1036 dr->num_entries = VNET_TX_RING_SIZE; 1037 dr->prod = dr->cons = 0; 1038 dr->pending = VNET_TX_RING_SIZE; 1039 dr->ncookies = ncookies; 1040 1041 return 0; 1042 1043 err_out: 1044 vnet_port_free_tx_bufs(port); 1045 1046 return err; 1047 } 1048 1049 static LIST_HEAD(vnet_list); 1050 static DEFINE_MUTEX(vnet_list_mutex); 1051 1052 static const struct net_device_ops vnet_ops = { 1053 .ndo_open = vnet_open, 1054 .ndo_stop = vnet_close, 1055 .ndo_set_rx_mode = vnet_set_rx_mode, 1056 .ndo_set_mac_address = vnet_set_mac_addr, 1057 .ndo_validate_addr = eth_validate_addr, 1058 .ndo_tx_timeout = vnet_tx_timeout, 1059 .ndo_change_mtu = vnet_change_mtu, 1060 .ndo_start_xmit = vnet_start_xmit, 1061 }; 1062 1063 static struct vnet *vnet_new(const u64 *local_mac) 1064 { 1065 struct net_device *dev; 1066 struct vnet *vp; 1067 int err, i; 1068 1069 dev = alloc_etherdev(sizeof(*vp)); 1070 if (!dev) 1071 return ERR_PTR(-ENOMEM); 1072 1073 for (i = 0; i < ETH_ALEN; i++) 1074 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 1075 1076 vp = netdev_priv(dev); 1077 1078 spin_lock_init(&vp->lock); 1079 tasklet_init(&vp->vnet_tx_wakeup, maybe_tx_wakeup, (unsigned long)vp); 1080 vp->dev = dev; 1081 1082 INIT_LIST_HEAD(&vp->port_list); 1083 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 1084 INIT_HLIST_HEAD(&vp->port_hash[i]); 1085 INIT_LIST_HEAD(&vp->list); 1086 vp->local_mac = *local_mac; 1087 1088 dev->netdev_ops = &vnet_ops; 1089 dev->ethtool_ops = &vnet_ethtool_ops; 1090 dev->watchdog_timeo = VNET_TX_TIMEOUT; 1091 1092 err = register_netdev(dev); 1093 if (err) { 1094 pr_err("Cannot register net device, aborting\n"); 1095 goto err_out_free_dev; 1096 } 1097 1098 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 1099 1100 list_add(&vp->list, &vnet_list); 1101 1102 return vp; 1103 1104 err_out_free_dev: 1105 free_netdev(dev); 1106 1107 return ERR_PTR(err); 1108 } 1109 1110 static struct vnet *vnet_find_or_create(const u64 *local_mac) 1111 { 1112 struct vnet *iter, *vp; 1113 1114 mutex_lock(&vnet_list_mutex); 1115 vp = NULL; 1116 list_for_each_entry(iter, &vnet_list, list) { 1117 if (iter->local_mac == *local_mac) { 1118 vp = iter; 1119 break; 1120 } 1121 } 1122 if (!vp) 1123 vp = vnet_new(local_mac); 1124 mutex_unlock(&vnet_list_mutex); 1125 1126 return vp; 1127 } 1128 1129 static void vnet_cleanup(void) 1130 { 1131 struct vnet *vp; 1132 struct net_device *dev; 1133 1134 mutex_lock(&vnet_list_mutex); 1135 while (!list_empty(&vnet_list)) { 1136 vp = list_first_entry(&vnet_list, struct vnet, list); 1137 list_del(&vp->list); 1138 dev = vp->dev; 1139 tasklet_kill(&vp->vnet_tx_wakeup); 1140 /* vio_unregister_driver() should have cleaned up port_list */ 1141 BUG_ON(!list_empty(&vp->port_list)); 1142 unregister_netdev(dev); 1143 free_netdev(dev); 1144 } 1145 mutex_unlock(&vnet_list_mutex); 1146 } 1147 1148 static const char *local_mac_prop = "local-mac-address"; 1149 1150 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 1151 u64 port_node) 1152 { 1153 const u64 *local_mac = NULL; 1154 u64 a; 1155 1156 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 1157 u64 target = mdesc_arc_target(hp, a); 1158 const char *name; 1159 1160 name = mdesc_get_property(hp, target, "name", NULL); 1161 if (!name || strcmp(name, "network")) 1162 continue; 1163 1164 local_mac = mdesc_get_property(hp, target, 1165 local_mac_prop, NULL); 1166 if (local_mac) 1167 break; 1168 } 1169 if (!local_mac) 1170 return ERR_PTR(-ENODEV); 1171 1172 return vnet_find_or_create(local_mac); 1173 } 1174 1175 static struct ldc_channel_config vnet_ldc_cfg = { 1176 .event = vnet_event, 1177 .mtu = 64, 1178 .mode = LDC_MODE_UNRELIABLE, 1179 }; 1180 1181 static struct vio_driver_ops vnet_vio_ops = { 1182 .send_attr = vnet_send_attr, 1183 .handle_attr = vnet_handle_attr, 1184 .handshake_complete = vnet_handshake_complete, 1185 }; 1186 1187 static void print_version(void) 1188 { 1189 printk_once(KERN_INFO "%s", version); 1190 } 1191 1192 const char *remote_macaddr_prop = "remote-mac-address"; 1193 1194 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1195 { 1196 struct mdesc_handle *hp; 1197 struct vnet_port *port; 1198 unsigned long flags; 1199 struct vnet *vp; 1200 const u64 *rmac; 1201 int len, i, err, switch_port; 1202 1203 print_version(); 1204 1205 hp = mdesc_grab(); 1206 1207 vp = vnet_find_parent(hp, vdev->mp); 1208 if (IS_ERR(vp)) { 1209 pr_err("Cannot find port parent vnet\n"); 1210 err = PTR_ERR(vp); 1211 goto err_out_put_mdesc; 1212 } 1213 1214 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 1215 err = -ENODEV; 1216 if (!rmac) { 1217 pr_err("Port lacks %s property\n", remote_macaddr_prop); 1218 goto err_out_put_mdesc; 1219 } 1220 1221 port = kzalloc(sizeof(*port), GFP_KERNEL); 1222 err = -ENOMEM; 1223 if (!port) 1224 goto err_out_put_mdesc; 1225 1226 for (i = 0; i < ETH_ALEN; i++) 1227 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 1228 1229 port->vp = vp; 1230 1231 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 1232 vnet_versions, ARRAY_SIZE(vnet_versions), 1233 &vnet_vio_ops, vp->dev->name); 1234 if (err) 1235 goto err_out_free_port; 1236 1237 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 1238 if (err) 1239 goto err_out_free_port; 1240 1241 err = vnet_port_alloc_tx_bufs(port); 1242 if (err) 1243 goto err_out_free_ldc; 1244 1245 INIT_HLIST_NODE(&port->hash); 1246 INIT_LIST_HEAD(&port->list); 1247 1248 switch_port = 0; 1249 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) 1250 switch_port = 1; 1251 port->switch_port = switch_port; 1252 1253 spin_lock_irqsave(&vp->lock, flags); 1254 if (switch_port) 1255 list_add(&port->list, &vp->port_list); 1256 else 1257 list_add_tail(&port->list, &vp->port_list); 1258 hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]); 1259 spin_unlock_irqrestore(&vp->lock, flags); 1260 1261 dev_set_drvdata(&vdev->dev, port); 1262 1263 pr_info("%s: PORT ( remote-mac %pM%s )\n", 1264 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 1265 1266 vio_port_up(&port->vio); 1267 1268 mdesc_release(hp); 1269 1270 return 0; 1271 1272 err_out_free_ldc: 1273 vio_ldc_free(&port->vio); 1274 1275 err_out_free_port: 1276 kfree(port); 1277 1278 err_out_put_mdesc: 1279 mdesc_release(hp); 1280 return err; 1281 } 1282 1283 static int vnet_port_remove(struct vio_dev *vdev) 1284 { 1285 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 1286 1287 if (port) { 1288 struct vnet *vp = port->vp; 1289 unsigned long flags; 1290 1291 del_timer_sync(&port->vio.timer); 1292 1293 spin_lock_irqsave(&vp->lock, flags); 1294 list_del(&port->list); 1295 hlist_del(&port->hash); 1296 spin_unlock_irqrestore(&vp->lock, flags); 1297 1298 vnet_port_free_tx_bufs(port); 1299 vio_ldc_free(&port->vio); 1300 1301 dev_set_drvdata(&vdev->dev, NULL); 1302 1303 kfree(port); 1304 1305 } 1306 return 0; 1307 } 1308 1309 static const struct vio_device_id vnet_port_match[] = { 1310 { 1311 .type = "vnet-port", 1312 }, 1313 {}, 1314 }; 1315 MODULE_DEVICE_TABLE(vio, vnet_port_match); 1316 1317 static struct vio_driver vnet_port_driver = { 1318 .id_table = vnet_port_match, 1319 .probe = vnet_port_probe, 1320 .remove = vnet_port_remove, 1321 .name = "vnet_port", 1322 }; 1323 1324 static int __init vnet_init(void) 1325 { 1326 return vio_register_driver(&vnet_port_driver); 1327 } 1328 1329 static void __exit vnet_exit(void) 1330 { 1331 vio_unregister_driver(&vnet_port_driver); 1332 vnet_cleanup(); 1333 } 1334 1335 module_init(vnet_init); 1336 module_exit(vnet_exit); 1337