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