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 #include <linux/highmem.h> 19 #include <linux/if_vlan.h> 20 #define CREATE_TRACE_POINTS 21 #include <trace/events/sunvnet.h> 22 23 #if IS_ENABLED(CONFIG_IPV6) 24 #include <linux/icmpv6.h> 25 #endif 26 27 #include <net/ip.h> 28 #include <net/icmp.h> 29 #include <net/route.h> 30 31 #include <asm/vio.h> 32 #include <asm/ldc.h> 33 34 #include "sunvnet.h" 35 36 #define DRV_MODULE_NAME "sunvnet" 37 #define DRV_MODULE_VERSION "1.0" 38 #define DRV_MODULE_RELDATE "June 25, 2007" 39 40 static char version[] = 41 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 42 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); 43 MODULE_DESCRIPTION("Sun LDOM virtual network driver"); 44 MODULE_LICENSE("GPL"); 45 MODULE_VERSION(DRV_MODULE_VERSION); 46 47 #define VNET_MAX_TXQS 16 48 49 /* Heuristic for the number of times to exponentially backoff and 50 * retry sending an LDC trigger when EAGAIN is encountered 51 */ 52 #define VNET_MAX_RETRIES 10 53 54 static int __vnet_tx_trigger(struct vnet_port *port, u32 start); 55 static void vnet_port_reset(struct vnet_port *port); 56 57 /* Ordered from largest major to lowest */ 58 static struct vio_version vnet_versions[] = { 59 { .major = 1, .minor = 8 }, 60 { .major = 1, .minor = 7 }, 61 { .major = 1, .minor = 6 }, 62 { .major = 1, .minor = 0 }, 63 }; 64 65 static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) 66 { 67 return vio_dring_avail(dr, VNET_TX_RING_SIZE); 68 } 69 70 static int vnet_handle_unknown(struct vnet_port *port, void *arg) 71 { 72 struct vio_msg_tag *pkt = arg; 73 74 pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n", 75 pkt->type, pkt->stype, pkt->stype_env, pkt->sid); 76 pr_err("Resetting connection\n"); 77 78 ldc_disconnect(port->vio.lp); 79 80 return -ECONNRESET; 81 } 82 83 static int vnet_port_alloc_tx_ring(struct vnet_port *port); 84 85 static int vnet_send_attr(struct vio_driver_state *vio) 86 { 87 struct vnet_port *port = to_vnet_port(vio); 88 struct net_device *dev = port->vp->dev; 89 struct vio_net_attr_info pkt; 90 int framelen = ETH_FRAME_LEN; 91 int i, err; 92 93 err = vnet_port_alloc_tx_ring(to_vnet_port(vio)); 94 if (err) 95 return err; 96 97 memset(&pkt, 0, sizeof(pkt)); 98 pkt.tag.type = VIO_TYPE_CTRL; 99 pkt.tag.stype = VIO_SUBTYPE_INFO; 100 pkt.tag.stype_env = VIO_ATTR_INFO; 101 pkt.tag.sid = vio_send_sid(vio); 102 if (vio_version_before(vio, 1, 2)) 103 pkt.xfer_mode = VIO_DRING_MODE; 104 else 105 pkt.xfer_mode = VIO_NEW_DRING_MODE; 106 pkt.addr_type = VNET_ADDR_ETHERMAC; 107 pkt.ack_freq = 0; 108 for (i = 0; i < 6; i++) 109 pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); 110 if (vio_version_after(vio, 1, 3)) { 111 if (port->rmtu) { 112 port->rmtu = min(VNET_MAXPACKET, port->rmtu); 113 pkt.mtu = port->rmtu; 114 } else { 115 port->rmtu = VNET_MAXPACKET; 116 pkt.mtu = port->rmtu; 117 } 118 if (vio_version_after_eq(vio, 1, 6)) 119 pkt.options = VIO_TX_DRING; 120 } else if (vio_version_before(vio, 1, 3)) { 121 pkt.mtu = framelen; 122 } else { /* v1.3 */ 123 pkt.mtu = framelen + VLAN_HLEN; 124 } 125 126 pkt.cflags = 0; 127 if (vio_version_after_eq(vio, 1, 7) && port->tso) { 128 pkt.cflags |= VNET_LSO_IPV4_CAPAB; 129 if (!port->tsolen) 130 port->tsolen = VNET_MAXTSO; 131 pkt.ipv4_lso_maxlen = port->tsolen; 132 } 133 134 pkt.plnk_updt = PHYSLINK_UPDATE_NONE; 135 136 viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " 137 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " 138 "cflags[0x%04x] lso_max[%u]\n", 139 pkt.xfer_mode, pkt.addr_type, 140 (unsigned long long)pkt.addr, 141 pkt.ack_freq, pkt.plnk_updt, pkt.options, 142 (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen); 143 144 145 return vio_ldc_send(vio, &pkt, sizeof(pkt)); 146 } 147 148 static int handle_attr_info(struct vio_driver_state *vio, 149 struct vio_net_attr_info *pkt) 150 { 151 struct vnet_port *port = to_vnet_port(vio); 152 u64 localmtu; 153 u8 xfer_mode; 154 155 viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " 156 "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " 157 " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", 158 pkt->xfer_mode, pkt->addr_type, 159 (unsigned long long)pkt->addr, 160 pkt->ack_freq, pkt->plnk_updt, pkt->options, 161 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, 162 pkt->ipv4_lso_maxlen); 163 164 pkt->tag.sid = vio_send_sid(vio); 165 166 xfer_mode = pkt->xfer_mode; 167 /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */ 168 if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE) 169 xfer_mode = VIO_NEW_DRING_MODE; 170 171 /* MTU negotiation: 172 * < v1.3 - ETH_FRAME_LEN exactly 173 * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change 174 * pkt->mtu for ACK 175 * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly 176 */ 177 if (vio_version_before(vio, 1, 3)) { 178 localmtu = ETH_FRAME_LEN; 179 } else if (vio_version_after(vio, 1, 3)) { 180 localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET; 181 localmtu = min(pkt->mtu, localmtu); 182 pkt->mtu = localmtu; 183 } else { /* v1.3 */ 184 localmtu = ETH_FRAME_LEN + VLAN_HLEN; 185 } 186 port->rmtu = localmtu; 187 188 /* LSO negotiation */ 189 if (vio_version_after_eq(vio, 1, 7)) 190 port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB); 191 else 192 port->tso = false; 193 if (port->tso) { 194 if (!port->tsolen) 195 port->tsolen = VNET_MAXTSO; 196 port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen); 197 if (port->tsolen < VNET_MINTSO) { 198 port->tso = false; 199 port->tsolen = 0; 200 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; 201 } 202 pkt->ipv4_lso_maxlen = port->tsolen; 203 } else { 204 pkt->cflags &= ~VNET_LSO_IPV4_CAPAB; 205 pkt->ipv4_lso_maxlen = 0; 206 } 207 208 /* for version >= 1.6, ACK packet mode we support */ 209 if (vio_version_after_eq(vio, 1, 6)) { 210 pkt->xfer_mode = VIO_NEW_DRING_MODE; 211 pkt->options = VIO_TX_DRING; 212 } 213 214 if (!(xfer_mode | VIO_NEW_DRING_MODE) || 215 pkt->addr_type != VNET_ADDR_ETHERMAC || 216 pkt->mtu != localmtu) { 217 viodbg(HS, "SEND NET ATTR NACK\n"); 218 219 pkt->tag.stype = VIO_SUBTYPE_NACK; 220 221 (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); 222 223 return -ECONNRESET; 224 } else { 225 viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] " 226 "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] " 227 "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", 228 pkt->xfer_mode, pkt->addr_type, 229 (unsigned long long)pkt->addr, 230 pkt->ack_freq, pkt->plnk_updt, pkt->options, 231 (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, 232 pkt->ipv4_lso_maxlen); 233 234 pkt->tag.stype = VIO_SUBTYPE_ACK; 235 236 return vio_ldc_send(vio, pkt, sizeof(*pkt)); 237 } 238 239 } 240 241 static int handle_attr_ack(struct vio_driver_state *vio, 242 struct vio_net_attr_info *pkt) 243 { 244 viodbg(HS, "GOT NET ATTR ACK\n"); 245 246 return 0; 247 } 248 249 static int handle_attr_nack(struct vio_driver_state *vio, 250 struct vio_net_attr_info *pkt) 251 { 252 viodbg(HS, "GOT NET ATTR NACK\n"); 253 254 return -ECONNRESET; 255 } 256 257 static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) 258 { 259 struct vio_net_attr_info *pkt = arg; 260 261 switch (pkt->tag.stype) { 262 case VIO_SUBTYPE_INFO: 263 return handle_attr_info(vio, pkt); 264 265 case VIO_SUBTYPE_ACK: 266 return handle_attr_ack(vio, pkt); 267 268 case VIO_SUBTYPE_NACK: 269 return handle_attr_nack(vio, pkt); 270 271 default: 272 return -ECONNRESET; 273 } 274 } 275 276 static void vnet_handshake_complete(struct vio_driver_state *vio) 277 { 278 struct vio_dring_state *dr; 279 280 dr = &vio->drings[VIO_DRIVER_RX_RING]; 281 dr->snd_nxt = dr->rcv_nxt = 1; 282 283 dr = &vio->drings[VIO_DRIVER_TX_RING]; 284 dr->snd_nxt = dr->rcv_nxt = 1; 285 } 286 287 /* The hypervisor interface that implements copying to/from imported 288 * memory from another domain requires that copies are done to 8-byte 289 * aligned buffers, and that the lengths of such copies are also 8-byte 290 * multiples. 291 * 292 * So we align skb->data to an 8-byte multiple and pad-out the data 293 * area so we can round the copy length up to the next multiple of 294 * 8 for the copy. 295 * 296 * The transmitter puts the actual start of the packet 6 bytes into 297 * the buffer it sends over, so that the IP headers after the ethernet 298 * header are aligned properly. These 6 bytes are not in the descriptor 299 * length, they are simply implied. This offset is represented using 300 * the VNET_PACKET_SKIP macro. 301 */ 302 static struct sk_buff *alloc_and_align_skb(struct net_device *dev, 303 unsigned int len) 304 { 305 struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); 306 unsigned long addr, off; 307 308 if (unlikely(!skb)) 309 return NULL; 310 311 addr = (unsigned long) skb->data; 312 off = ((addr + 7UL) & ~7UL) - addr; 313 if (off) 314 skb_reserve(skb, off); 315 316 return skb; 317 } 318 319 static inline void vnet_fullcsum(struct sk_buff *skb) 320 { 321 struct iphdr *iph = ip_hdr(skb); 322 int offset = skb_transport_offset(skb); 323 324 if (skb->protocol != htons(ETH_P_IP)) 325 return; 326 if (iph->protocol != IPPROTO_TCP && 327 iph->protocol != IPPROTO_UDP) 328 return; 329 skb->ip_summed = CHECKSUM_NONE; 330 skb->csum_level = 1; 331 skb->csum = 0; 332 if (iph->protocol == IPPROTO_TCP) { 333 struct tcphdr *ptcp = tcp_hdr(skb); 334 335 ptcp->check = 0; 336 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 337 ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 338 skb->len - offset, IPPROTO_TCP, 339 skb->csum); 340 } else if (iph->protocol == IPPROTO_UDP) { 341 struct udphdr *pudp = udp_hdr(skb); 342 343 pudp->check = 0; 344 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); 345 pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 346 skb->len - offset, IPPROTO_UDP, 347 skb->csum); 348 } 349 } 350 351 static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc) 352 { 353 struct net_device *dev = port->vp->dev; 354 unsigned int len = desc->size; 355 unsigned int copy_len; 356 struct sk_buff *skb; 357 int maxlen; 358 int err; 359 360 err = -EMSGSIZE; 361 if (port->tso && port->tsolen > port->rmtu) 362 maxlen = port->tsolen; 363 else 364 maxlen = port->rmtu; 365 if (unlikely(len < ETH_ZLEN || len > maxlen)) { 366 dev->stats.rx_length_errors++; 367 goto out_dropped; 368 } 369 370 skb = alloc_and_align_skb(dev, len); 371 err = -ENOMEM; 372 if (unlikely(!skb)) { 373 dev->stats.rx_missed_errors++; 374 goto out_dropped; 375 } 376 377 copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; 378 skb_put(skb, copy_len); 379 err = ldc_copy(port->vio.lp, LDC_COPY_IN, 380 skb->data, copy_len, 0, 381 desc->cookies, desc->ncookies); 382 if (unlikely(err < 0)) { 383 dev->stats.rx_frame_errors++; 384 goto out_free_skb; 385 } 386 387 skb_pull(skb, VNET_PACKET_SKIP); 388 skb_trim(skb, len); 389 skb->protocol = eth_type_trans(skb, dev); 390 391 if (vio_version_after_eq(&port->vio, 1, 8)) { 392 struct vio_net_dext *dext = vio_net_ext(desc); 393 394 skb_reset_network_header(skb); 395 396 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) { 397 if (skb->protocol == ETH_P_IP) { 398 struct iphdr *iph = ip_hdr(skb); 399 400 iph->check = 0; 401 ip_send_check(iph); 402 } 403 } 404 if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) && 405 skb->ip_summed == CHECKSUM_NONE) { 406 if (skb->protocol == htons(ETH_P_IP)) { 407 struct iphdr *iph = ip_hdr(skb); 408 int ihl = iph->ihl * 4; 409 410 skb_reset_transport_header(skb); 411 skb_set_transport_header(skb, ihl); 412 vnet_fullcsum(skb); 413 } 414 } 415 if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) { 416 skb->ip_summed = CHECKSUM_PARTIAL; 417 skb->csum_level = 0; 418 if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK) 419 skb->csum_level = 1; 420 } 421 } 422 423 skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL; 424 425 dev->stats.rx_packets++; 426 dev->stats.rx_bytes += len; 427 napi_gro_receive(&port->napi, skb); 428 return 0; 429 430 out_free_skb: 431 kfree_skb(skb); 432 433 out_dropped: 434 dev->stats.rx_dropped++; 435 return err; 436 } 437 438 static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, 439 u32 start, u32 end, u8 vio_dring_state) 440 { 441 struct vio_dring_data hdr = { 442 .tag = { 443 .type = VIO_TYPE_DATA, 444 .stype = VIO_SUBTYPE_ACK, 445 .stype_env = VIO_DRING_DATA, 446 .sid = vio_send_sid(&port->vio), 447 }, 448 .dring_ident = dr->ident, 449 .start_idx = start, 450 .end_idx = end, 451 .state = vio_dring_state, 452 }; 453 int err, delay; 454 int retries = 0; 455 456 hdr.seq = dr->snd_nxt; 457 delay = 1; 458 do { 459 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 460 if (err > 0) { 461 dr->snd_nxt++; 462 break; 463 } 464 udelay(delay); 465 if ((delay <<= 1) > 128) 466 delay = 128; 467 if (retries++ > VNET_MAX_RETRIES) { 468 pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n", 469 port->raddr[0], port->raddr[1], 470 port->raddr[2], port->raddr[3], 471 port->raddr[4], port->raddr[5]); 472 break; 473 } 474 } while (err == -EAGAIN); 475 476 if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) { 477 port->stop_rx_idx = end; 478 port->stop_rx = true; 479 } else { 480 port->stop_rx_idx = 0; 481 port->stop_rx = false; 482 } 483 484 return err; 485 } 486 487 static struct vio_net_desc *get_rx_desc(struct vnet_port *port, 488 struct vio_dring_state *dr, 489 u32 index) 490 { 491 struct vio_net_desc *desc = port->vio.desc_buf; 492 int err; 493 494 err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, 495 (index * dr->entry_size), 496 dr->cookies, dr->ncookies); 497 if (err < 0) 498 return ERR_PTR(err); 499 500 return desc; 501 } 502 503 static int put_rx_desc(struct vnet_port *port, 504 struct vio_dring_state *dr, 505 struct vio_net_desc *desc, 506 u32 index) 507 { 508 int err; 509 510 err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, 511 (index * dr->entry_size), 512 dr->cookies, dr->ncookies); 513 if (err < 0) 514 return err; 515 516 return 0; 517 } 518 519 static int vnet_walk_rx_one(struct vnet_port *port, 520 struct vio_dring_state *dr, 521 u32 index, int *needs_ack) 522 { 523 struct vio_net_desc *desc = get_rx_desc(port, dr, index); 524 struct vio_driver_state *vio = &port->vio; 525 int err; 526 527 BUG_ON(desc == NULL); 528 if (IS_ERR(desc)) 529 return PTR_ERR(desc); 530 531 if (desc->hdr.state != VIO_DESC_READY) 532 return 1; 533 534 dma_rmb(); 535 536 viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", 537 desc->hdr.state, desc->hdr.ack, 538 desc->size, desc->ncookies, 539 desc->cookies[0].cookie_addr, 540 desc->cookies[0].cookie_size); 541 542 err = vnet_rx_one(port, desc); 543 if (err == -ECONNRESET) 544 return err; 545 trace_vnet_rx_one(port->vio._local_sid, port->vio._peer_sid, 546 index, desc->hdr.ack); 547 desc->hdr.state = VIO_DESC_DONE; 548 err = put_rx_desc(port, dr, desc, index); 549 if (err < 0) 550 return err; 551 *needs_ack = desc->hdr.ack; 552 return 0; 553 } 554 555 static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, 556 u32 start, u32 end, int *npkts, int budget) 557 { 558 struct vio_driver_state *vio = &port->vio; 559 int ack_start = -1, ack_end = -1; 560 bool send_ack = true; 561 562 end = (end == (u32) -1) ? vio_dring_prev(dr, start) 563 : vio_dring_next(dr, end); 564 565 viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); 566 567 while (start != end) { 568 int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); 569 if (err == -ECONNRESET) 570 return err; 571 if (err != 0) 572 break; 573 (*npkts)++; 574 if (ack_start == -1) 575 ack_start = start; 576 ack_end = start; 577 start = vio_dring_next(dr, start); 578 if (ack && start != end) { 579 err = vnet_send_ack(port, dr, ack_start, ack_end, 580 VIO_DRING_ACTIVE); 581 if (err == -ECONNRESET) 582 return err; 583 ack_start = -1; 584 } 585 if ((*npkts) >= budget) { 586 send_ack = false; 587 break; 588 } 589 } 590 if (unlikely(ack_start == -1)) 591 ack_start = ack_end = vio_dring_prev(dr, start); 592 if (send_ack) { 593 port->napi_resume = false; 594 trace_vnet_tx_send_stopped_ack(port->vio._local_sid, 595 port->vio._peer_sid, 596 ack_end, *npkts); 597 return vnet_send_ack(port, dr, ack_start, ack_end, 598 VIO_DRING_STOPPED); 599 } else { 600 trace_vnet_tx_defer_stopped_ack(port->vio._local_sid, 601 port->vio._peer_sid, 602 ack_end, *npkts); 603 port->napi_resume = true; 604 port->napi_stop_idx = ack_end; 605 return 1; 606 } 607 } 608 609 static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts, 610 int budget) 611 { 612 struct vio_dring_data *pkt = msgbuf; 613 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; 614 struct vio_driver_state *vio = &port->vio; 615 616 viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", 617 pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); 618 619 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 620 return 0; 621 if (unlikely(pkt->seq != dr->rcv_nxt)) { 622 pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", 623 pkt->seq, dr->rcv_nxt); 624 return 0; 625 } 626 627 if (!port->napi_resume) 628 dr->rcv_nxt++; 629 630 /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ 631 632 return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx, 633 npkts, budget); 634 } 635 636 static int idx_is_pending(struct vio_dring_state *dr, u32 end) 637 { 638 u32 idx = dr->cons; 639 int found = 0; 640 641 while (idx != dr->prod) { 642 if (idx == end) { 643 found = 1; 644 break; 645 } 646 idx = vio_dring_next(dr, idx); 647 } 648 return found; 649 } 650 651 static int vnet_ack(struct vnet_port *port, void *msgbuf) 652 { 653 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 654 struct vio_dring_data *pkt = msgbuf; 655 struct net_device *dev; 656 struct vnet *vp; 657 u32 end; 658 struct vio_net_desc *desc; 659 struct netdev_queue *txq; 660 661 if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) 662 return 0; 663 664 end = pkt->end_idx; 665 vp = port->vp; 666 dev = vp->dev; 667 netif_tx_lock(dev); 668 if (unlikely(!idx_is_pending(dr, end))) { 669 netif_tx_unlock(dev); 670 return 0; 671 } 672 673 /* sync for race conditions with vnet_start_xmit() and tell xmit it 674 * is time to send a trigger. 675 */ 676 trace_vnet_rx_stopped_ack(port->vio._local_sid, 677 port->vio._peer_sid, end); 678 dr->cons = vio_dring_next(dr, end); 679 desc = vio_dring_entry(dr, dr->cons); 680 if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) { 681 /* vnet_start_xmit() just populated this dring but missed 682 * sending the "start" LDC message to the consumer. 683 * Send a "start" trigger on its behalf. 684 */ 685 if (__vnet_tx_trigger(port, dr->cons) > 0) 686 port->start_cons = false; 687 else 688 port->start_cons = true; 689 } else { 690 port->start_cons = true; 691 } 692 netif_tx_unlock(dev); 693 694 txq = netdev_get_tx_queue(dev, port->q_index); 695 if (unlikely(netif_tx_queue_stopped(txq) && 696 vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) 697 return 1; 698 699 return 0; 700 } 701 702 static int vnet_nack(struct vnet_port *port, void *msgbuf) 703 { 704 /* XXX just reset or similar XXX */ 705 return 0; 706 } 707 708 static int handle_mcast(struct vnet_port *port, void *msgbuf) 709 { 710 struct vio_net_mcast_info *pkt = msgbuf; 711 712 if (pkt->tag.stype != VIO_SUBTYPE_ACK) 713 pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", 714 port->vp->dev->name, 715 pkt->tag.type, 716 pkt->tag.stype, 717 pkt->tag.stype_env, 718 pkt->tag.sid); 719 720 return 0; 721 } 722 723 /* Got back a STOPPED LDC message on port. If the queue is stopped, 724 * wake it up so that we'll send out another START message at the 725 * next TX. 726 */ 727 static void maybe_tx_wakeup(struct vnet_port *port) 728 { 729 struct netdev_queue *txq; 730 731 txq = netdev_get_tx_queue(port->vp->dev, port->q_index); 732 __netif_tx_lock(txq, smp_processor_id()); 733 if (likely(netif_tx_queue_stopped(txq))) { 734 struct vio_dring_state *dr; 735 736 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 737 netif_tx_wake_queue(txq); 738 } 739 __netif_tx_unlock(txq); 740 } 741 742 static inline bool port_is_up(struct vnet_port *vnet) 743 { 744 struct vio_driver_state *vio = &vnet->vio; 745 746 return !!(vio->hs_state & VIO_HS_COMPLETE); 747 } 748 749 static int vnet_event_napi(struct vnet_port *port, int budget) 750 { 751 struct vio_driver_state *vio = &port->vio; 752 int tx_wakeup, err; 753 int npkts = 0; 754 int event = (port->rx_event & LDC_EVENT_RESET); 755 756 ldc_ctrl: 757 if (unlikely(event == LDC_EVENT_RESET || 758 event == LDC_EVENT_UP)) { 759 vio_link_state_change(vio, event); 760 761 if (event == LDC_EVENT_RESET) { 762 vnet_port_reset(port); 763 vio_port_up(vio); 764 } 765 port->rx_event = 0; 766 return 0; 767 } 768 /* We may have multiple LDC events in rx_event. Unroll send_events() */ 769 event = (port->rx_event & LDC_EVENT_UP); 770 port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP); 771 if (event == LDC_EVENT_UP) 772 goto ldc_ctrl; 773 event = port->rx_event; 774 if (!(event & LDC_EVENT_DATA_READY)) 775 return 0; 776 777 /* we dont expect any other bits than RESET, UP, DATA_READY */ 778 BUG_ON(event != LDC_EVENT_DATA_READY); 779 780 tx_wakeup = err = 0; 781 while (1) { 782 union { 783 struct vio_msg_tag tag; 784 u64 raw[8]; 785 } msgbuf; 786 787 if (port->napi_resume) { 788 struct vio_dring_data *pkt = 789 (struct vio_dring_data *)&msgbuf; 790 struct vio_dring_state *dr = 791 &port->vio.drings[VIO_DRIVER_RX_RING]; 792 793 pkt->tag.type = VIO_TYPE_DATA; 794 pkt->tag.stype = VIO_SUBTYPE_INFO; 795 pkt->tag.stype_env = VIO_DRING_DATA; 796 pkt->seq = dr->rcv_nxt; 797 pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx); 798 pkt->end_idx = -1; 799 goto napi_resume; 800 } 801 err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); 802 if (unlikely(err < 0)) { 803 if (err == -ECONNRESET) 804 vio_conn_reset(vio); 805 break; 806 } 807 if (err == 0) 808 break; 809 viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", 810 msgbuf.tag.type, 811 msgbuf.tag.stype, 812 msgbuf.tag.stype_env, 813 msgbuf.tag.sid); 814 err = vio_validate_sid(vio, &msgbuf.tag); 815 if (err < 0) 816 break; 817 napi_resume: 818 if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { 819 if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { 820 if (!port_is_up(port)) { 821 /* failures like handshake_failure() 822 * may have cleaned up dring, but 823 * NAPI polling may bring us here. 824 */ 825 err = -ECONNRESET; 826 break; 827 } 828 err = vnet_rx(port, &msgbuf, &npkts, budget); 829 if (npkts >= budget) 830 break; 831 if (npkts == 0) 832 break; 833 } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { 834 err = vnet_ack(port, &msgbuf); 835 if (err > 0) 836 tx_wakeup |= err; 837 } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { 838 err = vnet_nack(port, &msgbuf); 839 } 840 } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { 841 if (msgbuf.tag.stype_env == VNET_MCAST_INFO) 842 err = handle_mcast(port, &msgbuf); 843 else 844 err = vio_control_pkt_engine(vio, &msgbuf); 845 if (err) 846 break; 847 } else { 848 err = vnet_handle_unknown(port, &msgbuf); 849 } 850 if (err == -ECONNRESET) 851 break; 852 } 853 if (unlikely(tx_wakeup && err != -ECONNRESET)) 854 maybe_tx_wakeup(port); 855 return npkts; 856 } 857 858 static int vnet_poll(struct napi_struct *napi, int budget) 859 { 860 struct vnet_port *port = container_of(napi, struct vnet_port, napi); 861 struct vio_driver_state *vio = &port->vio; 862 int processed = vnet_event_napi(port, budget); 863 864 if (processed < budget) { 865 napi_complete(napi); 866 port->rx_event &= ~LDC_EVENT_DATA_READY; 867 vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED); 868 } 869 return processed; 870 } 871 872 static void vnet_event(void *arg, int event) 873 { 874 struct vnet_port *port = arg; 875 struct vio_driver_state *vio = &port->vio; 876 877 port->rx_event |= event; 878 vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED); 879 napi_schedule(&port->napi); 880 881 } 882 883 static int __vnet_tx_trigger(struct vnet_port *port, u32 start) 884 { 885 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 886 struct vio_dring_data hdr = { 887 .tag = { 888 .type = VIO_TYPE_DATA, 889 .stype = VIO_SUBTYPE_INFO, 890 .stype_env = VIO_DRING_DATA, 891 .sid = vio_send_sid(&port->vio), 892 }, 893 .dring_ident = dr->ident, 894 .start_idx = start, 895 .end_idx = (u32) -1, 896 }; 897 int err, delay; 898 int retries = 0; 899 900 if (port->stop_rx) { 901 trace_vnet_tx_pending_stopped_ack(port->vio._local_sid, 902 port->vio._peer_sid, 903 port->stop_rx_idx, -1); 904 err = vnet_send_ack(port, 905 &port->vio.drings[VIO_DRIVER_RX_RING], 906 port->stop_rx_idx, -1, 907 VIO_DRING_STOPPED); 908 if (err <= 0) 909 return err; 910 } 911 912 hdr.seq = dr->snd_nxt; 913 delay = 1; 914 do { 915 err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); 916 if (err > 0) { 917 dr->snd_nxt++; 918 break; 919 } 920 udelay(delay); 921 if ((delay <<= 1) > 128) 922 delay = 128; 923 if (retries++ > VNET_MAX_RETRIES) 924 break; 925 } while (err == -EAGAIN); 926 trace_vnet_tx_trigger(port->vio._local_sid, 927 port->vio._peer_sid, start, err); 928 929 return err; 930 } 931 932 struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) 933 { 934 unsigned int hash = vnet_hashfn(skb->data); 935 struct hlist_head *hp = &vp->port_hash[hash]; 936 struct vnet_port *port; 937 938 hlist_for_each_entry_rcu(port, hp, hash) { 939 if (!port_is_up(port)) 940 continue; 941 if (ether_addr_equal(port->raddr, skb->data)) 942 return port; 943 } 944 list_for_each_entry_rcu(port, &vp->port_list, list) { 945 if (!port->switch_port) 946 continue; 947 if (!port_is_up(port)) 948 continue; 949 return port; 950 } 951 return NULL; 952 } 953 954 static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port, 955 unsigned *pending) 956 { 957 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 958 struct sk_buff *skb = NULL; 959 int i, txi; 960 961 *pending = 0; 962 963 txi = dr->prod; 964 for (i = 0; i < VNET_TX_RING_SIZE; ++i) { 965 struct vio_net_desc *d; 966 967 --txi; 968 if (txi < 0) 969 txi = VNET_TX_RING_SIZE-1; 970 971 d = vio_dring_entry(dr, txi); 972 973 if (d->hdr.state == VIO_DESC_READY) { 974 (*pending)++; 975 continue; 976 } 977 if (port->tx_bufs[txi].skb) { 978 if (d->hdr.state != VIO_DESC_DONE) 979 pr_notice("invalid ring buffer state %d\n", 980 d->hdr.state); 981 BUG_ON(port->tx_bufs[txi].skb->next); 982 983 port->tx_bufs[txi].skb->next = skb; 984 skb = port->tx_bufs[txi].skb; 985 port->tx_bufs[txi].skb = NULL; 986 987 ldc_unmap(port->vio.lp, 988 port->tx_bufs[txi].cookies, 989 port->tx_bufs[txi].ncookies); 990 } else if (d->hdr.state == VIO_DESC_FREE) 991 break; 992 d->hdr.state = VIO_DESC_FREE; 993 } 994 return skb; 995 } 996 997 static inline void vnet_free_skbs(struct sk_buff *skb) 998 { 999 struct sk_buff *next; 1000 1001 while (skb) { 1002 next = skb->next; 1003 skb->next = NULL; 1004 dev_kfree_skb(skb); 1005 skb = next; 1006 } 1007 } 1008 1009 static void vnet_clean_timer_expire(unsigned long port0) 1010 { 1011 struct vnet_port *port = (struct vnet_port *)port0; 1012 struct sk_buff *freeskbs; 1013 unsigned pending; 1014 1015 netif_tx_lock(port->vp->dev); 1016 freeskbs = vnet_clean_tx_ring(port, &pending); 1017 netif_tx_unlock(port->vp->dev); 1018 1019 vnet_free_skbs(freeskbs); 1020 1021 if (pending) 1022 (void)mod_timer(&port->clean_timer, 1023 jiffies + VNET_CLEAN_TIMEOUT); 1024 else 1025 del_timer(&port->clean_timer); 1026 } 1027 1028 static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb, 1029 struct ldc_trans_cookie *cookies, int ncookies, 1030 unsigned int map_perm) 1031 { 1032 int i, nc, err, blen; 1033 1034 /* header */ 1035 blen = skb_headlen(skb); 1036 if (blen < ETH_ZLEN) 1037 blen = ETH_ZLEN; 1038 blen += VNET_PACKET_SKIP; 1039 blen += 8 - (blen & 7); 1040 1041 err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies, 1042 ncookies, map_perm); 1043 if (err < 0) 1044 return err; 1045 nc = err; 1046 1047 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1048 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1049 u8 *vaddr; 1050 1051 if (nc < ncookies) { 1052 vaddr = kmap_atomic(skb_frag_page(f)); 1053 blen = skb_frag_size(f); 1054 blen += 8 - (blen & 7); 1055 err = ldc_map_single(lp, vaddr + f->page_offset, 1056 blen, cookies + nc, ncookies - nc, 1057 map_perm); 1058 kunmap_atomic(vaddr); 1059 } else { 1060 err = -EMSGSIZE; 1061 } 1062 1063 if (err < 0) { 1064 ldc_unmap(lp, cookies, nc); 1065 return err; 1066 } 1067 nc += err; 1068 } 1069 return nc; 1070 } 1071 1072 static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies) 1073 { 1074 struct sk_buff *nskb; 1075 int i, len, pad, docopy; 1076 1077 len = skb->len; 1078 pad = 0; 1079 if (len < ETH_ZLEN) { 1080 pad += ETH_ZLEN - skb->len; 1081 len += pad; 1082 } 1083 len += VNET_PACKET_SKIP; 1084 pad += 8 - (len & 7); 1085 1086 /* make sure we have enough cookies and alignment in every frag */ 1087 docopy = skb_shinfo(skb)->nr_frags >= ncookies; 1088 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1089 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1090 1091 docopy |= f->page_offset & 7; 1092 } 1093 if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP || 1094 skb_tailroom(skb) < pad || 1095 skb_headroom(skb) < VNET_PACKET_SKIP || docopy) { 1096 int start = 0, offset; 1097 __wsum csum; 1098 1099 len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN; 1100 nskb = alloc_and_align_skb(skb->dev, len); 1101 if (nskb == NULL) { 1102 dev_kfree_skb(skb); 1103 return NULL; 1104 } 1105 skb_reserve(nskb, VNET_PACKET_SKIP); 1106 1107 nskb->protocol = skb->protocol; 1108 offset = skb_mac_header(skb) - skb->data; 1109 skb_set_mac_header(nskb, offset); 1110 offset = skb_network_header(skb) - skb->data; 1111 skb_set_network_header(nskb, offset); 1112 offset = skb_transport_header(skb) - skb->data; 1113 skb_set_transport_header(nskb, offset); 1114 1115 offset = 0; 1116 nskb->csum_offset = skb->csum_offset; 1117 nskb->ip_summed = skb->ip_summed; 1118 1119 if (skb->ip_summed == CHECKSUM_PARTIAL) 1120 start = skb_checksum_start_offset(skb); 1121 if (start) { 1122 struct iphdr *iph = ip_hdr(nskb); 1123 int offset = start + nskb->csum_offset; 1124 1125 if (skb_copy_bits(skb, 0, nskb->data, start)) { 1126 dev_kfree_skb(nskb); 1127 dev_kfree_skb(skb); 1128 return NULL; 1129 } 1130 *(__sum16 *)(skb->data + offset) = 0; 1131 csum = skb_copy_and_csum_bits(skb, start, 1132 nskb->data + start, 1133 skb->len - start, 0); 1134 if (iph->protocol == IPPROTO_TCP || 1135 iph->protocol == IPPROTO_UDP) { 1136 csum = csum_tcpudp_magic(iph->saddr, iph->daddr, 1137 skb->len - start, 1138 iph->protocol, csum); 1139 } 1140 *(__sum16 *)(nskb->data + offset) = csum; 1141 1142 nskb->ip_summed = CHECKSUM_NONE; 1143 } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) { 1144 dev_kfree_skb(nskb); 1145 dev_kfree_skb(skb); 1146 return NULL; 1147 } 1148 (void)skb_put(nskb, skb->len); 1149 if (skb_is_gso(skb)) { 1150 skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size; 1151 skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type; 1152 } 1153 nskb->queue_mapping = skb->queue_mapping; 1154 dev_kfree_skb(skb); 1155 skb = nskb; 1156 } 1157 return skb; 1158 } 1159 1160 static u16 1161 vnet_select_queue(struct net_device *dev, struct sk_buff *skb, 1162 void *accel_priv, select_queue_fallback_t fallback) 1163 { 1164 struct vnet *vp = netdev_priv(dev); 1165 struct vnet_port *port = __tx_port_find(vp, skb); 1166 1167 if (port == NULL) 1168 return 0; 1169 return port->q_index; 1170 } 1171 1172 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev); 1173 1174 static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb) 1175 { 1176 struct net_device *dev = port->vp->dev; 1177 struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1178 struct sk_buff *segs; 1179 int maclen, datalen; 1180 int status; 1181 int gso_size, gso_type, gso_segs; 1182 int hlen = skb_transport_header(skb) - skb_mac_header(skb); 1183 int proto = IPPROTO_IP; 1184 1185 if (skb->protocol == htons(ETH_P_IP)) 1186 proto = ip_hdr(skb)->protocol; 1187 else if (skb->protocol == htons(ETH_P_IPV6)) 1188 proto = ipv6_hdr(skb)->nexthdr; 1189 1190 if (proto == IPPROTO_TCP) 1191 hlen += tcp_hdr(skb)->doff * 4; 1192 else if (proto == IPPROTO_UDP) 1193 hlen += sizeof(struct udphdr); 1194 else { 1195 pr_err("vnet_handle_offloads GSO with unknown transport " 1196 "protocol %d tproto %d\n", skb->protocol, proto); 1197 hlen = 128; /* XXX */ 1198 } 1199 datalen = port->tsolen - hlen; 1200 1201 gso_size = skb_shinfo(skb)->gso_size; 1202 gso_type = skb_shinfo(skb)->gso_type; 1203 gso_segs = skb_shinfo(skb)->gso_segs; 1204 1205 if (port->tso && gso_size < datalen) 1206 gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen); 1207 1208 if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) { 1209 struct netdev_queue *txq; 1210 1211 txq = netdev_get_tx_queue(dev, port->q_index); 1212 netif_tx_stop_queue(txq); 1213 if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs) 1214 return NETDEV_TX_BUSY; 1215 netif_tx_wake_queue(txq); 1216 } 1217 1218 maclen = skb_network_header(skb) - skb_mac_header(skb); 1219 skb_pull(skb, maclen); 1220 1221 if (port->tso && gso_size < datalen) { 1222 if (skb_unclone(skb, GFP_ATOMIC)) 1223 goto out_dropped; 1224 1225 /* segment to TSO size */ 1226 skb_shinfo(skb)->gso_size = datalen; 1227 skb_shinfo(skb)->gso_segs = gso_segs; 1228 } 1229 segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO); 1230 if (IS_ERR(segs)) 1231 goto out_dropped; 1232 1233 skb_push(skb, maclen); 1234 skb_reset_mac_header(skb); 1235 1236 status = 0; 1237 while (segs) { 1238 struct sk_buff *curr = segs; 1239 1240 segs = segs->next; 1241 curr->next = NULL; 1242 if (port->tso && curr->len > dev->mtu) { 1243 skb_shinfo(curr)->gso_size = gso_size; 1244 skb_shinfo(curr)->gso_type = gso_type; 1245 skb_shinfo(curr)->gso_segs = 1246 DIV_ROUND_UP(curr->len - hlen, gso_size); 1247 } else 1248 skb_shinfo(curr)->gso_size = 0; 1249 1250 skb_push(curr, maclen); 1251 skb_reset_mac_header(curr); 1252 memcpy(skb_mac_header(curr), skb_mac_header(skb), 1253 maclen); 1254 curr->csum_start = skb_transport_header(curr) - curr->head; 1255 if (ip_hdr(curr)->protocol == IPPROTO_TCP) 1256 curr->csum_offset = offsetof(struct tcphdr, check); 1257 else if (ip_hdr(curr)->protocol == IPPROTO_UDP) 1258 curr->csum_offset = offsetof(struct udphdr, check); 1259 1260 if (!(status & NETDEV_TX_MASK)) 1261 status = vnet_start_xmit(curr, dev); 1262 if (status & NETDEV_TX_MASK) 1263 dev_kfree_skb_any(curr); 1264 } 1265 1266 if (!(status & NETDEV_TX_MASK)) 1267 dev_kfree_skb_any(skb); 1268 return status; 1269 out_dropped: 1270 dev->stats.tx_dropped++; 1271 dev_kfree_skb_any(skb); 1272 return NETDEV_TX_OK; 1273 } 1274 1275 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) 1276 { 1277 struct vnet *vp = netdev_priv(dev); 1278 struct vnet_port *port = NULL; 1279 struct vio_dring_state *dr; 1280 struct vio_net_desc *d; 1281 unsigned int len; 1282 struct sk_buff *freeskbs = NULL; 1283 int i, err, txi; 1284 unsigned pending = 0; 1285 struct netdev_queue *txq; 1286 1287 rcu_read_lock(); 1288 port = __tx_port_find(vp, skb); 1289 if (unlikely(!port)) { 1290 rcu_read_unlock(); 1291 goto out_dropped; 1292 } 1293 1294 if (skb_is_gso(skb) && skb->len > port->tsolen) { 1295 err = vnet_handle_offloads(port, skb); 1296 rcu_read_unlock(); 1297 return err; 1298 } 1299 1300 if (!skb_is_gso(skb) && skb->len > port->rmtu) { 1301 unsigned long localmtu = port->rmtu - ETH_HLEN; 1302 1303 if (vio_version_after_eq(&port->vio, 1, 3)) 1304 localmtu -= VLAN_HLEN; 1305 1306 if (skb->protocol == htons(ETH_P_IP)) { 1307 struct flowi4 fl4; 1308 struct rtable *rt = NULL; 1309 1310 memset(&fl4, 0, sizeof(fl4)); 1311 fl4.flowi4_oif = dev->ifindex; 1312 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); 1313 fl4.daddr = ip_hdr(skb)->daddr; 1314 fl4.saddr = ip_hdr(skb)->saddr; 1315 1316 rt = ip_route_output_key(dev_net(dev), &fl4); 1317 rcu_read_unlock(); 1318 if (!IS_ERR(rt)) { 1319 skb_dst_set(skb, &rt->dst); 1320 icmp_send(skb, ICMP_DEST_UNREACH, 1321 ICMP_FRAG_NEEDED, 1322 htonl(localmtu)); 1323 } 1324 } 1325 #if IS_ENABLED(CONFIG_IPV6) 1326 else if (skb->protocol == htons(ETH_P_IPV6)) 1327 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu); 1328 #endif 1329 goto out_dropped; 1330 } 1331 1332 skb = vnet_skb_shape(skb, 2); 1333 1334 if (unlikely(!skb)) 1335 goto out_dropped; 1336 1337 if (skb->ip_summed == CHECKSUM_PARTIAL) 1338 vnet_fullcsum(skb); 1339 1340 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1341 i = skb_get_queue_mapping(skb); 1342 txq = netdev_get_tx_queue(dev, i); 1343 if (unlikely(vnet_tx_dring_avail(dr) < 1)) { 1344 if (!netif_tx_queue_stopped(txq)) { 1345 netif_tx_stop_queue(txq); 1346 1347 /* This is a hard error, log it. */ 1348 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); 1349 dev->stats.tx_errors++; 1350 } 1351 rcu_read_unlock(); 1352 return NETDEV_TX_BUSY; 1353 } 1354 1355 d = vio_dring_cur(dr); 1356 1357 txi = dr->prod; 1358 1359 freeskbs = vnet_clean_tx_ring(port, &pending); 1360 1361 BUG_ON(port->tx_bufs[txi].skb); 1362 1363 len = skb->len; 1364 if (len < ETH_ZLEN) 1365 len = ETH_ZLEN; 1366 1367 err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2, 1368 (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); 1369 if (err < 0) { 1370 netdev_info(dev, "tx buffer map error %d\n", err); 1371 goto out_dropped; 1372 } 1373 1374 port->tx_bufs[txi].skb = skb; 1375 skb = NULL; 1376 port->tx_bufs[txi].ncookies = err; 1377 1378 /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), 1379 * thus it is safe to not set VIO_ACK_ENABLE for each transmission: 1380 * the protocol itself does not require it as long as the peer 1381 * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. 1382 * 1383 * An ACK for every packet in the ring is expensive as the 1384 * sending of LDC messages is slow and affects performance. 1385 */ 1386 d->hdr.ack = VIO_ACK_DISABLE; 1387 d->size = len; 1388 d->ncookies = port->tx_bufs[txi].ncookies; 1389 for (i = 0; i < d->ncookies; i++) 1390 d->cookies[i] = port->tx_bufs[txi].cookies[i]; 1391 if (vio_version_after_eq(&port->vio, 1, 7)) { 1392 struct vio_net_dext *dext = vio_net_ext(d); 1393 1394 memset(dext, 0, sizeof(*dext)); 1395 if (skb_is_gso(port->tx_bufs[txi].skb)) { 1396 dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb) 1397 ->gso_size; 1398 dext->flags |= VNET_PKT_IPV4_LSO; 1399 } 1400 if (vio_version_after_eq(&port->vio, 1, 8) && 1401 !port->switch_port) { 1402 dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; 1403 dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK; 1404 } 1405 } 1406 1407 /* This has to be a non-SMP write barrier because we are writing 1408 * to memory which is shared with the peer LDOM. 1409 */ 1410 dma_wmb(); 1411 1412 d->hdr.state = VIO_DESC_READY; 1413 1414 /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent 1415 * to notify the consumer that some descriptors are READY. 1416 * After that "start" trigger, no additional triggers are needed until 1417 * a DRING_STOPPED is received from the consumer. The dr->cons field 1418 * (set up by vnet_ack()) has the value of the next dring index 1419 * that has not yet been ack-ed. We send a "start" trigger here 1420 * if, and only if, start_cons is true (reset it afterward). Conversely, 1421 * vnet_ack() should check if the dring corresponding to cons 1422 * is marked READY, but start_cons was false. 1423 * If so, vnet_ack() should send out the missed "start" trigger. 1424 * 1425 * Note that the dma_wmb() above makes sure the cookies et al. are 1426 * not globally visible before the VIO_DESC_READY, and that the 1427 * stores are ordered correctly by the compiler. The consumer will 1428 * not proceed until the VIO_DESC_READY is visible assuring that 1429 * the consumer does not observe anything related to descriptors 1430 * out of order. The HV trap from the LDC start trigger is the 1431 * producer to consumer announcement that work is available to the 1432 * consumer 1433 */ 1434 if (!port->start_cons) { /* previous trigger suffices */ 1435 trace_vnet_skip_tx_trigger(port->vio._local_sid, 1436 port->vio._peer_sid, dr->cons); 1437 goto ldc_start_done; 1438 } 1439 1440 err = __vnet_tx_trigger(port, dr->cons); 1441 if (unlikely(err < 0)) { 1442 netdev_info(dev, "TX trigger error %d\n", err); 1443 d->hdr.state = VIO_DESC_FREE; 1444 skb = port->tx_bufs[txi].skb; 1445 port->tx_bufs[txi].skb = NULL; 1446 dev->stats.tx_carrier_errors++; 1447 goto out_dropped; 1448 } 1449 1450 ldc_start_done: 1451 port->start_cons = false; 1452 1453 dev->stats.tx_packets++; 1454 dev->stats.tx_bytes += port->tx_bufs[txi].skb->len; 1455 1456 dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); 1457 if (unlikely(vnet_tx_dring_avail(dr) < 1)) { 1458 netif_tx_stop_queue(txq); 1459 if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) 1460 netif_tx_wake_queue(txq); 1461 } 1462 1463 (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); 1464 rcu_read_unlock(); 1465 1466 vnet_free_skbs(freeskbs); 1467 1468 return NETDEV_TX_OK; 1469 1470 out_dropped: 1471 if (pending) 1472 (void)mod_timer(&port->clean_timer, 1473 jiffies + VNET_CLEAN_TIMEOUT); 1474 else if (port) 1475 del_timer(&port->clean_timer); 1476 if (port) 1477 rcu_read_unlock(); 1478 if (skb) 1479 dev_kfree_skb(skb); 1480 vnet_free_skbs(freeskbs); 1481 dev->stats.tx_dropped++; 1482 return NETDEV_TX_OK; 1483 } 1484 1485 static void vnet_tx_timeout(struct net_device *dev) 1486 { 1487 /* XXX Implement me XXX */ 1488 } 1489 1490 static int vnet_open(struct net_device *dev) 1491 { 1492 netif_carrier_on(dev); 1493 netif_tx_start_all_queues(dev); 1494 1495 return 0; 1496 } 1497 1498 static int vnet_close(struct net_device *dev) 1499 { 1500 netif_tx_stop_all_queues(dev); 1501 netif_carrier_off(dev); 1502 1503 return 0; 1504 } 1505 1506 static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) 1507 { 1508 struct vnet_mcast_entry *m; 1509 1510 for (m = vp->mcast_list; m; m = m->next) { 1511 if (ether_addr_equal(m->addr, addr)) 1512 return m; 1513 } 1514 return NULL; 1515 } 1516 1517 static void __update_mc_list(struct vnet *vp, struct net_device *dev) 1518 { 1519 struct netdev_hw_addr *ha; 1520 1521 netdev_for_each_mc_addr(ha, dev) { 1522 struct vnet_mcast_entry *m; 1523 1524 m = __vnet_mc_find(vp, ha->addr); 1525 if (m) { 1526 m->hit = 1; 1527 continue; 1528 } 1529 1530 if (!m) { 1531 m = kzalloc(sizeof(*m), GFP_ATOMIC); 1532 if (!m) 1533 continue; 1534 memcpy(m->addr, ha->addr, ETH_ALEN); 1535 m->hit = 1; 1536 1537 m->next = vp->mcast_list; 1538 vp->mcast_list = m; 1539 } 1540 } 1541 } 1542 1543 static void __send_mc_list(struct vnet *vp, struct vnet_port *port) 1544 { 1545 struct vio_net_mcast_info info; 1546 struct vnet_mcast_entry *m, **pp; 1547 int n_addrs; 1548 1549 memset(&info, 0, sizeof(info)); 1550 1551 info.tag.type = VIO_TYPE_CTRL; 1552 info.tag.stype = VIO_SUBTYPE_INFO; 1553 info.tag.stype_env = VNET_MCAST_INFO; 1554 info.tag.sid = vio_send_sid(&port->vio); 1555 info.set = 1; 1556 1557 n_addrs = 0; 1558 for (m = vp->mcast_list; m; m = m->next) { 1559 if (m->sent) 1560 continue; 1561 m->sent = 1; 1562 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 1563 m->addr, ETH_ALEN); 1564 if (++n_addrs == VNET_NUM_MCAST) { 1565 info.count = n_addrs; 1566 1567 (void) vio_ldc_send(&port->vio, &info, 1568 sizeof(info)); 1569 n_addrs = 0; 1570 } 1571 } 1572 if (n_addrs) { 1573 info.count = n_addrs; 1574 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 1575 } 1576 1577 info.set = 0; 1578 1579 n_addrs = 0; 1580 pp = &vp->mcast_list; 1581 while ((m = *pp) != NULL) { 1582 if (m->hit) { 1583 m->hit = 0; 1584 pp = &m->next; 1585 continue; 1586 } 1587 1588 memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], 1589 m->addr, ETH_ALEN); 1590 if (++n_addrs == VNET_NUM_MCAST) { 1591 info.count = n_addrs; 1592 (void) vio_ldc_send(&port->vio, &info, 1593 sizeof(info)); 1594 n_addrs = 0; 1595 } 1596 1597 *pp = m->next; 1598 kfree(m); 1599 } 1600 if (n_addrs) { 1601 info.count = n_addrs; 1602 (void) vio_ldc_send(&port->vio, &info, sizeof(info)); 1603 } 1604 } 1605 1606 static void vnet_set_rx_mode(struct net_device *dev) 1607 { 1608 struct vnet *vp = netdev_priv(dev); 1609 struct vnet_port *port; 1610 1611 rcu_read_lock(); 1612 list_for_each_entry_rcu(port, &vp->port_list, list) { 1613 1614 if (port->switch_port) { 1615 __update_mc_list(vp, dev); 1616 __send_mc_list(vp, port); 1617 break; 1618 } 1619 } 1620 rcu_read_unlock(); 1621 } 1622 1623 static int vnet_change_mtu(struct net_device *dev, int new_mtu) 1624 { 1625 if (new_mtu < 68 || new_mtu > 65535) 1626 return -EINVAL; 1627 1628 dev->mtu = new_mtu; 1629 return 0; 1630 } 1631 1632 static int vnet_set_mac_addr(struct net_device *dev, void *p) 1633 { 1634 return -EINVAL; 1635 } 1636 1637 static void vnet_get_drvinfo(struct net_device *dev, 1638 struct ethtool_drvinfo *info) 1639 { 1640 strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); 1641 strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); 1642 } 1643 1644 static u32 vnet_get_msglevel(struct net_device *dev) 1645 { 1646 struct vnet *vp = netdev_priv(dev); 1647 return vp->msg_enable; 1648 } 1649 1650 static void vnet_set_msglevel(struct net_device *dev, u32 value) 1651 { 1652 struct vnet *vp = netdev_priv(dev); 1653 vp->msg_enable = value; 1654 } 1655 1656 static const struct ethtool_ops vnet_ethtool_ops = { 1657 .get_drvinfo = vnet_get_drvinfo, 1658 .get_msglevel = vnet_get_msglevel, 1659 .set_msglevel = vnet_set_msglevel, 1660 .get_link = ethtool_op_get_link, 1661 }; 1662 1663 static void vnet_port_free_tx_bufs(struct vnet_port *port) 1664 { 1665 struct vio_dring_state *dr; 1666 int i; 1667 1668 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1669 1670 if (dr->base == NULL) 1671 return; 1672 1673 for (i = 0; i < VNET_TX_RING_SIZE; i++) { 1674 struct vio_net_desc *d; 1675 void *skb = port->tx_bufs[i].skb; 1676 1677 if (!skb) 1678 continue; 1679 1680 d = vio_dring_entry(dr, i); 1681 1682 ldc_unmap(port->vio.lp, 1683 port->tx_bufs[i].cookies, 1684 port->tx_bufs[i].ncookies); 1685 dev_kfree_skb(skb); 1686 port->tx_bufs[i].skb = NULL; 1687 d->hdr.state = VIO_DESC_FREE; 1688 } 1689 ldc_free_exp_dring(port->vio.lp, dr->base, 1690 (dr->entry_size * dr->num_entries), 1691 dr->cookies, dr->ncookies); 1692 dr->base = NULL; 1693 dr->entry_size = 0; 1694 dr->num_entries = 0; 1695 dr->pending = 0; 1696 dr->ncookies = 0; 1697 } 1698 1699 static void vnet_port_reset(struct vnet_port *port) 1700 { 1701 del_timer(&port->clean_timer); 1702 vnet_port_free_tx_bufs(port); 1703 port->rmtu = 0; 1704 port->tso = true; 1705 port->tsolen = 0; 1706 } 1707 1708 static int vnet_port_alloc_tx_ring(struct vnet_port *port) 1709 { 1710 struct vio_dring_state *dr; 1711 unsigned long len, elen; 1712 int i, err, ncookies; 1713 void *dring; 1714 1715 dr = &port->vio.drings[VIO_DRIVER_TX_RING]; 1716 1717 elen = sizeof(struct vio_net_desc) + 1718 sizeof(struct ldc_trans_cookie) * 2; 1719 if (vio_version_after_eq(&port->vio, 1, 7)) 1720 elen += sizeof(struct vio_net_dext); 1721 len = VNET_TX_RING_SIZE * elen; 1722 1723 ncookies = VIO_MAX_RING_COOKIES; 1724 dring = ldc_alloc_exp_dring(port->vio.lp, len, 1725 dr->cookies, &ncookies, 1726 (LDC_MAP_SHADOW | 1727 LDC_MAP_DIRECT | 1728 LDC_MAP_RW)); 1729 if (IS_ERR(dring)) { 1730 err = PTR_ERR(dring); 1731 goto err_out; 1732 } 1733 1734 dr->base = dring; 1735 dr->entry_size = elen; 1736 dr->num_entries = VNET_TX_RING_SIZE; 1737 dr->prod = dr->cons = 0; 1738 port->start_cons = true; /* need an initial trigger */ 1739 dr->pending = VNET_TX_RING_SIZE; 1740 dr->ncookies = ncookies; 1741 1742 for (i = 0; i < VNET_TX_RING_SIZE; ++i) { 1743 struct vio_net_desc *d; 1744 1745 d = vio_dring_entry(dr, i); 1746 d->hdr.state = VIO_DESC_FREE; 1747 } 1748 return 0; 1749 1750 err_out: 1751 vnet_port_free_tx_bufs(port); 1752 1753 return err; 1754 } 1755 1756 #ifdef CONFIG_NET_POLL_CONTROLLER 1757 static void vnet_poll_controller(struct net_device *dev) 1758 { 1759 struct vnet *vp = netdev_priv(dev); 1760 struct vnet_port *port; 1761 unsigned long flags; 1762 1763 spin_lock_irqsave(&vp->lock, flags); 1764 if (!list_empty(&vp->port_list)) { 1765 port = list_entry(vp->port_list.next, struct vnet_port, list); 1766 napi_schedule(&port->napi); 1767 } 1768 spin_unlock_irqrestore(&vp->lock, flags); 1769 } 1770 #endif 1771 static LIST_HEAD(vnet_list); 1772 static DEFINE_MUTEX(vnet_list_mutex); 1773 1774 static const struct net_device_ops vnet_ops = { 1775 .ndo_open = vnet_open, 1776 .ndo_stop = vnet_close, 1777 .ndo_set_rx_mode = vnet_set_rx_mode, 1778 .ndo_set_mac_address = vnet_set_mac_addr, 1779 .ndo_validate_addr = eth_validate_addr, 1780 .ndo_tx_timeout = vnet_tx_timeout, 1781 .ndo_change_mtu = vnet_change_mtu, 1782 .ndo_start_xmit = vnet_start_xmit, 1783 .ndo_select_queue = vnet_select_queue, 1784 #ifdef CONFIG_NET_POLL_CONTROLLER 1785 .ndo_poll_controller = vnet_poll_controller, 1786 #endif 1787 }; 1788 1789 static struct vnet *vnet_new(const u64 *local_mac, 1790 struct vio_dev *vdev) 1791 { 1792 struct net_device *dev; 1793 struct vnet *vp; 1794 int err, i; 1795 1796 dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); 1797 if (!dev) 1798 return ERR_PTR(-ENOMEM); 1799 dev->needed_headroom = VNET_PACKET_SKIP + 8; 1800 dev->needed_tailroom = 8; 1801 1802 for (i = 0; i < ETH_ALEN; i++) 1803 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; 1804 1805 vp = netdev_priv(dev); 1806 1807 spin_lock_init(&vp->lock); 1808 vp->dev = dev; 1809 1810 INIT_LIST_HEAD(&vp->port_list); 1811 for (i = 0; i < VNET_PORT_HASH_SIZE; i++) 1812 INIT_HLIST_HEAD(&vp->port_hash[i]); 1813 INIT_LIST_HEAD(&vp->list); 1814 vp->local_mac = *local_mac; 1815 1816 dev->netdev_ops = &vnet_ops; 1817 dev->ethtool_ops = &vnet_ethtool_ops; 1818 dev->watchdog_timeo = VNET_TX_TIMEOUT; 1819 1820 dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE | 1821 NETIF_F_HW_CSUM | NETIF_F_SG; 1822 dev->features = dev->hw_features; 1823 1824 SET_NETDEV_DEV(dev, &vdev->dev); 1825 1826 err = register_netdev(dev); 1827 if (err) { 1828 pr_err("Cannot register net device, aborting\n"); 1829 goto err_out_free_dev; 1830 } 1831 1832 netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); 1833 1834 list_add(&vp->list, &vnet_list); 1835 1836 return vp; 1837 1838 err_out_free_dev: 1839 free_netdev(dev); 1840 1841 return ERR_PTR(err); 1842 } 1843 1844 static struct vnet *vnet_find_or_create(const u64 *local_mac, 1845 struct vio_dev *vdev) 1846 { 1847 struct vnet *iter, *vp; 1848 1849 mutex_lock(&vnet_list_mutex); 1850 vp = NULL; 1851 list_for_each_entry(iter, &vnet_list, list) { 1852 if (iter->local_mac == *local_mac) { 1853 vp = iter; 1854 break; 1855 } 1856 } 1857 if (!vp) 1858 vp = vnet_new(local_mac, vdev); 1859 mutex_unlock(&vnet_list_mutex); 1860 1861 return vp; 1862 } 1863 1864 static void vnet_cleanup(void) 1865 { 1866 struct vnet *vp; 1867 struct net_device *dev; 1868 1869 mutex_lock(&vnet_list_mutex); 1870 while (!list_empty(&vnet_list)) { 1871 vp = list_first_entry(&vnet_list, struct vnet, list); 1872 list_del(&vp->list); 1873 dev = vp->dev; 1874 /* vio_unregister_driver() should have cleaned up port_list */ 1875 BUG_ON(!list_empty(&vp->port_list)); 1876 unregister_netdev(dev); 1877 free_netdev(dev); 1878 } 1879 mutex_unlock(&vnet_list_mutex); 1880 } 1881 1882 static const char *local_mac_prop = "local-mac-address"; 1883 1884 static struct vnet *vnet_find_parent(struct mdesc_handle *hp, 1885 u64 port_node, 1886 struct vio_dev *vdev) 1887 { 1888 const u64 *local_mac = NULL; 1889 u64 a; 1890 1891 mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { 1892 u64 target = mdesc_arc_target(hp, a); 1893 const char *name; 1894 1895 name = mdesc_get_property(hp, target, "name", NULL); 1896 if (!name || strcmp(name, "network")) 1897 continue; 1898 1899 local_mac = mdesc_get_property(hp, target, 1900 local_mac_prop, NULL); 1901 if (local_mac) 1902 break; 1903 } 1904 if (!local_mac) 1905 return ERR_PTR(-ENODEV); 1906 1907 return vnet_find_or_create(local_mac, vdev); 1908 } 1909 1910 static struct ldc_channel_config vnet_ldc_cfg = { 1911 .event = vnet_event, 1912 .mtu = 64, 1913 .mode = LDC_MODE_UNRELIABLE, 1914 }; 1915 1916 static struct vio_driver_ops vnet_vio_ops = { 1917 .send_attr = vnet_send_attr, 1918 .handle_attr = vnet_handle_attr, 1919 .handshake_complete = vnet_handshake_complete, 1920 }; 1921 1922 static void print_version(void) 1923 { 1924 printk_once(KERN_INFO "%s", version); 1925 } 1926 1927 const char *remote_macaddr_prop = "remote-mac-address"; 1928 1929 static void 1930 vnet_port_add_txq(struct vnet_port *port) 1931 { 1932 struct vnet *vp = port->vp; 1933 int n; 1934 1935 n = vp->nports++; 1936 n = n & (VNET_MAX_TXQS - 1); 1937 port->q_index = n; 1938 netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index)); 1939 } 1940 1941 static void 1942 vnet_port_rm_txq(struct vnet_port *port) 1943 { 1944 port->vp->nports--; 1945 netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index)); 1946 } 1947 1948 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) 1949 { 1950 struct mdesc_handle *hp; 1951 struct vnet_port *port; 1952 unsigned long flags; 1953 struct vnet *vp; 1954 const u64 *rmac; 1955 int len, i, err, switch_port; 1956 1957 print_version(); 1958 1959 hp = mdesc_grab(); 1960 1961 vp = vnet_find_parent(hp, vdev->mp, vdev); 1962 if (IS_ERR(vp)) { 1963 pr_err("Cannot find port parent vnet\n"); 1964 err = PTR_ERR(vp); 1965 goto err_out_put_mdesc; 1966 } 1967 1968 rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); 1969 err = -ENODEV; 1970 if (!rmac) { 1971 pr_err("Port lacks %s property\n", remote_macaddr_prop); 1972 goto err_out_put_mdesc; 1973 } 1974 1975 port = kzalloc(sizeof(*port), GFP_KERNEL); 1976 err = -ENOMEM; 1977 if (!port) 1978 goto err_out_put_mdesc; 1979 1980 for (i = 0; i < ETH_ALEN; i++) 1981 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; 1982 1983 port->vp = vp; 1984 1985 err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, 1986 vnet_versions, ARRAY_SIZE(vnet_versions), 1987 &vnet_vio_ops, vp->dev->name); 1988 if (err) 1989 goto err_out_free_port; 1990 1991 err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); 1992 if (err) 1993 goto err_out_free_port; 1994 1995 netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT); 1996 1997 INIT_HLIST_NODE(&port->hash); 1998 INIT_LIST_HEAD(&port->list); 1999 2000 switch_port = 0; 2001 if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) 2002 switch_port = 1; 2003 port->switch_port = switch_port; 2004 port->tso = true; 2005 port->tsolen = 0; 2006 2007 spin_lock_irqsave(&vp->lock, flags); 2008 if (switch_port) 2009 list_add_rcu(&port->list, &vp->port_list); 2010 else 2011 list_add_tail_rcu(&port->list, &vp->port_list); 2012 hlist_add_head_rcu(&port->hash, 2013 &vp->port_hash[vnet_hashfn(port->raddr)]); 2014 vnet_port_add_txq(port); 2015 spin_unlock_irqrestore(&vp->lock, flags); 2016 2017 dev_set_drvdata(&vdev->dev, port); 2018 2019 pr_info("%s: PORT ( remote-mac %pM%s )\n", 2020 vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); 2021 2022 setup_timer(&port->clean_timer, vnet_clean_timer_expire, 2023 (unsigned long)port); 2024 2025 napi_enable(&port->napi); 2026 vio_port_up(&port->vio); 2027 2028 mdesc_release(hp); 2029 2030 return 0; 2031 2032 err_out_free_port: 2033 kfree(port); 2034 2035 err_out_put_mdesc: 2036 mdesc_release(hp); 2037 return err; 2038 } 2039 2040 static int vnet_port_remove(struct vio_dev *vdev) 2041 { 2042 struct vnet_port *port = dev_get_drvdata(&vdev->dev); 2043 2044 if (port) { 2045 2046 del_timer_sync(&port->vio.timer); 2047 2048 napi_disable(&port->napi); 2049 2050 list_del_rcu(&port->list); 2051 hlist_del_rcu(&port->hash); 2052 2053 synchronize_rcu(); 2054 del_timer_sync(&port->clean_timer); 2055 vnet_port_rm_txq(port); 2056 netif_napi_del(&port->napi); 2057 vnet_port_free_tx_bufs(port); 2058 vio_ldc_free(&port->vio); 2059 2060 dev_set_drvdata(&vdev->dev, NULL); 2061 2062 kfree(port); 2063 2064 } 2065 return 0; 2066 } 2067 2068 static const struct vio_device_id vnet_port_match[] = { 2069 { 2070 .type = "vnet-port", 2071 }, 2072 {}, 2073 }; 2074 MODULE_DEVICE_TABLE(vio, vnet_port_match); 2075 2076 static struct vio_driver vnet_port_driver = { 2077 .id_table = vnet_port_match, 2078 .probe = vnet_port_probe, 2079 .remove = vnet_port_remove, 2080 .name = "vnet_port", 2081 }; 2082 2083 static int __init vnet_init(void) 2084 { 2085 return vio_register_driver(&vnet_port_driver); 2086 } 2087 2088 static void __exit vnet_exit(void) 2089 { 2090 vio_unregister_driver(&vnet_port_driver); 2091 vnet_cleanup(); 2092 } 2093 2094 module_init(vnet_init); 2095 module_exit(vnet_exit); 2096