1 /* 2 * Copyright (c) 2009, Microsoft Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, see <http://www.gnu.org/licenses/>. 15 * 16 * Authors: 17 * Haiyang Zhang <haiyangz@microsoft.com> 18 * Hank Janssen <hjanssen@microsoft.com> 19 */ 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/init.h> 23 #include <linux/atomic.h> 24 #include <linux/module.h> 25 #include <linux/highmem.h> 26 #include <linux/device.h> 27 #include <linux/io.h> 28 #include <linux/delay.h> 29 #include <linux/netdevice.h> 30 #include <linux/inetdevice.h> 31 #include <linux/etherdevice.h> 32 #include <linux/skbuff.h> 33 #include <linux/if_vlan.h> 34 #include <linux/in.h> 35 #include <linux/slab.h> 36 #include <net/arp.h> 37 #include <net/route.h> 38 #include <net/sock.h> 39 #include <net/pkt_sched.h> 40 41 #include "hyperv_net.h" 42 43 struct net_device_context { 44 /* point back to our device context */ 45 struct hv_device *device_ctx; 46 struct delayed_work dwork; 47 struct work_struct work; 48 }; 49 50 #define RING_SIZE_MIN 64 51 static int ring_size = 128; 52 module_param(ring_size, int, S_IRUGO); 53 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)"); 54 55 static void do_set_multicast(struct work_struct *w) 56 { 57 struct net_device_context *ndevctx = 58 container_of(w, struct net_device_context, work); 59 struct netvsc_device *nvdev; 60 struct rndis_device *rdev; 61 62 nvdev = hv_get_drvdata(ndevctx->device_ctx); 63 if (nvdev == NULL || nvdev->ndev == NULL) 64 return; 65 66 rdev = nvdev->extension; 67 if (rdev == NULL) 68 return; 69 70 if (nvdev->ndev->flags & IFF_PROMISC) 71 rndis_filter_set_packet_filter(rdev, 72 NDIS_PACKET_TYPE_PROMISCUOUS); 73 else 74 rndis_filter_set_packet_filter(rdev, 75 NDIS_PACKET_TYPE_BROADCAST | 76 NDIS_PACKET_TYPE_ALL_MULTICAST | 77 NDIS_PACKET_TYPE_DIRECTED); 78 } 79 80 static void netvsc_set_multicast_list(struct net_device *net) 81 { 82 struct net_device_context *net_device_ctx = netdev_priv(net); 83 84 schedule_work(&net_device_ctx->work); 85 } 86 87 static int netvsc_open(struct net_device *net) 88 { 89 struct net_device_context *net_device_ctx = netdev_priv(net); 90 struct hv_device *device_obj = net_device_ctx->device_ctx; 91 struct netvsc_device *nvdev; 92 struct rndis_device *rdev; 93 int ret = 0; 94 95 netif_carrier_off(net); 96 97 /* Open up the device */ 98 ret = rndis_filter_open(device_obj); 99 if (ret != 0) { 100 netdev_err(net, "unable to open device (ret %d).\n", ret); 101 return ret; 102 } 103 104 netif_tx_start_all_queues(net); 105 106 nvdev = hv_get_drvdata(device_obj); 107 rdev = nvdev->extension; 108 if (!rdev->link_state) 109 netif_carrier_on(net); 110 111 return ret; 112 } 113 114 static int netvsc_close(struct net_device *net) 115 { 116 struct net_device_context *net_device_ctx = netdev_priv(net); 117 struct hv_device *device_obj = net_device_ctx->device_ctx; 118 int ret; 119 120 netif_tx_disable(net); 121 122 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */ 123 cancel_work_sync(&net_device_ctx->work); 124 ret = rndis_filter_close(device_obj); 125 if (ret != 0) 126 netdev_err(net, "unable to close device (ret %d).\n", ret); 127 128 return ret; 129 } 130 131 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size, 132 int pkt_type) 133 { 134 struct rndis_packet *rndis_pkt; 135 struct rndis_per_packet_info *ppi; 136 137 rndis_pkt = &msg->msg.pkt; 138 rndis_pkt->data_offset += ppi_size; 139 140 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt + 141 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len); 142 143 ppi->size = ppi_size; 144 ppi->type = pkt_type; 145 ppi->ppi_offset = sizeof(struct rndis_per_packet_info); 146 147 rndis_pkt->per_pkt_info_len += ppi_size; 148 149 return ppi; 150 } 151 152 union sub_key { 153 u64 k; 154 struct { 155 u8 pad[3]; 156 u8 kb; 157 u32 ka; 158 }; 159 }; 160 161 /* Toeplitz hash function 162 * data: network byte order 163 * return: host byte order 164 */ 165 static u32 comp_hash(u8 *key, int klen, void *data, int dlen) 166 { 167 union sub_key subk; 168 int k_next = 4; 169 u8 dt; 170 int i, j; 171 u32 ret = 0; 172 173 subk.k = 0; 174 subk.ka = ntohl(*(u32 *)key); 175 176 for (i = 0; i < dlen; i++) { 177 subk.kb = key[k_next]; 178 k_next = (k_next + 1) % klen; 179 dt = ((u8 *)data)[i]; 180 for (j = 0; j < 8; j++) { 181 if (dt & 0x80) 182 ret ^= subk.ka; 183 dt <<= 1; 184 subk.k <<= 1; 185 } 186 } 187 188 return ret; 189 } 190 191 static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb) 192 { 193 struct flow_keys flow; 194 int data_len; 195 196 if (!skb_flow_dissect(skb, &flow) || flow.n_proto != htons(ETH_P_IP)) 197 return false; 198 199 if (flow.ip_proto == IPPROTO_TCP) 200 data_len = 12; 201 else 202 data_len = 8; 203 204 *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, &flow, data_len); 205 206 return true; 207 } 208 209 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, 210 void *accel_priv, select_queue_fallback_t fallback) 211 { 212 struct net_device_context *net_device_ctx = netdev_priv(ndev); 213 struct hv_device *hdev = net_device_ctx->device_ctx; 214 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev); 215 u32 hash; 216 u16 q_idx = 0; 217 218 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1) 219 return 0; 220 221 if (netvsc_set_hash(&hash, skb)) { 222 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] % 223 ndev->real_num_tx_queues; 224 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3); 225 } 226 227 return q_idx; 228 } 229 230 static void netvsc_xmit_completion(void *context) 231 { 232 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context; 233 struct sk_buff *skb = (struct sk_buff *) 234 (unsigned long)packet->send_completion_tid; 235 u32 index = packet->send_buf_index; 236 237 kfree(packet); 238 239 if (skb && (index == NETVSC_INVALID_INDEX)) 240 dev_kfree_skb_any(skb); 241 } 242 243 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len, 244 struct hv_page_buffer *pb) 245 { 246 int j = 0; 247 248 /* Deal with compund pages by ignoring unused part 249 * of the page. 250 */ 251 page += (offset >> PAGE_SHIFT); 252 offset &= ~PAGE_MASK; 253 254 while (len > 0) { 255 unsigned long bytes; 256 257 bytes = PAGE_SIZE - offset; 258 if (bytes > len) 259 bytes = len; 260 pb[j].pfn = page_to_pfn(page); 261 pb[j].offset = offset; 262 pb[j].len = bytes; 263 264 offset += bytes; 265 len -= bytes; 266 267 if (offset == PAGE_SIZE && len) { 268 page++; 269 offset = 0; 270 j++; 271 } 272 } 273 274 return j + 1; 275 } 276 277 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb, 278 struct hv_page_buffer *pb) 279 { 280 u32 slots_used = 0; 281 char *data = skb->data; 282 int frags = skb_shinfo(skb)->nr_frags; 283 int i; 284 285 /* The packet is laid out thus: 286 * 1. hdr 287 * 2. skb linear data 288 * 3. skb fragment data 289 */ 290 if (hdr != NULL) 291 slots_used += fill_pg_buf(virt_to_page(hdr), 292 offset_in_page(hdr), 293 len, &pb[slots_used]); 294 295 slots_used += fill_pg_buf(virt_to_page(data), 296 offset_in_page(data), 297 skb_headlen(skb), &pb[slots_used]); 298 299 for (i = 0; i < frags; i++) { 300 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 301 302 slots_used += fill_pg_buf(skb_frag_page(frag), 303 frag->page_offset, 304 skb_frag_size(frag), &pb[slots_used]); 305 } 306 return slots_used; 307 } 308 309 static int count_skb_frag_slots(struct sk_buff *skb) 310 { 311 int i, frags = skb_shinfo(skb)->nr_frags; 312 int pages = 0; 313 314 for (i = 0; i < frags; i++) { 315 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 316 unsigned long size = skb_frag_size(frag); 317 unsigned long offset = frag->page_offset; 318 319 /* Skip unused frames from start of page */ 320 offset &= ~PAGE_MASK; 321 pages += PFN_UP(offset + size); 322 } 323 return pages; 324 } 325 326 static int netvsc_get_slots(struct sk_buff *skb) 327 { 328 char *data = skb->data; 329 unsigned int offset = offset_in_page(data); 330 unsigned int len = skb_headlen(skb); 331 int slots; 332 int frag_slots; 333 334 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE); 335 frag_slots = count_skb_frag_slots(skb); 336 return slots + frag_slots; 337 } 338 339 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off) 340 { 341 u32 ret_val = TRANSPORT_INFO_NOT_IP; 342 343 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) && 344 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) { 345 goto not_ip; 346 } 347 348 *trans_off = skb_transport_offset(skb); 349 350 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) { 351 struct iphdr *iphdr = ip_hdr(skb); 352 353 if (iphdr->protocol == IPPROTO_TCP) 354 ret_val = TRANSPORT_INFO_IPV4_TCP; 355 else if (iphdr->protocol == IPPROTO_UDP) 356 ret_val = TRANSPORT_INFO_IPV4_UDP; 357 } else { 358 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) 359 ret_val = TRANSPORT_INFO_IPV6_TCP; 360 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) 361 ret_val = TRANSPORT_INFO_IPV6_UDP; 362 } 363 364 not_ip: 365 return ret_val; 366 } 367 368 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) 369 { 370 struct net_device_context *net_device_ctx = netdev_priv(net); 371 struct hv_netvsc_packet *packet; 372 int ret; 373 unsigned int num_data_pgs; 374 struct rndis_message *rndis_msg; 375 struct rndis_packet *rndis_pkt; 376 u32 rndis_msg_size; 377 bool isvlan; 378 struct rndis_per_packet_info *ppi; 379 struct ndis_tcp_ip_checksum_info *csum_info; 380 struct ndis_tcp_lso_info *lso_info; 381 int hdr_offset; 382 u32 net_trans_info; 383 u32 hash; 384 u32 skb_length = skb->len; 385 386 387 /* We will atmost need two pages to describe the rndis 388 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number 389 * of pages in a single packet. 390 */ 391 num_data_pgs = netvsc_get_slots(skb) + 2; 392 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { 393 netdev_err(net, "Packet too big: %u\n", skb->len); 394 dev_kfree_skb(skb); 395 net->stats.tx_dropped++; 396 return NETDEV_TX_OK; 397 } 398 399 /* Allocate a netvsc packet based on # of frags. */ 400 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 401 (num_data_pgs * sizeof(struct hv_page_buffer)) + 402 sizeof(struct rndis_message) + 403 NDIS_VLAN_PPI_SIZE + NDIS_CSUM_PPI_SIZE + 404 NDIS_LSO_PPI_SIZE + NDIS_HASH_PPI_SIZE, GFP_ATOMIC); 405 if (!packet) { 406 /* out of memory, drop packet */ 407 netdev_err(net, "unable to allocate hv_netvsc_packet\n"); 408 409 dev_kfree_skb(skb); 410 net->stats.tx_dropped++; 411 return NETDEV_TX_OK; 412 } 413 414 packet->vlan_tci = skb->vlan_tci; 415 416 packet->q_idx = skb_get_queue_mapping(skb); 417 418 packet->is_data_pkt = true; 419 packet->total_data_buflen = skb->len; 420 421 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + 422 sizeof(struct hv_netvsc_packet) + 423 (num_data_pgs * sizeof(struct hv_page_buffer))); 424 425 /* Set the completion routine */ 426 packet->send_completion = netvsc_xmit_completion; 427 packet->send_completion_ctx = packet; 428 packet->send_completion_tid = (unsigned long)skb; 429 430 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; 431 432 /* Add the rndis header */ 433 rndis_msg = packet->rndis_msg; 434 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; 435 rndis_msg->msg_len = packet->total_data_buflen; 436 rndis_pkt = &rndis_msg->msg.pkt; 437 rndis_pkt->data_offset = sizeof(struct rndis_packet); 438 rndis_pkt->data_len = packet->total_data_buflen; 439 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); 440 441 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); 442 443 hash = skb_get_hash_raw(skb); 444 if (hash != 0 && net->real_num_tx_queues > 1) { 445 rndis_msg_size += NDIS_HASH_PPI_SIZE; 446 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, 447 NBL_HASH_VALUE); 448 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash; 449 } 450 451 if (isvlan) { 452 struct ndis_pkt_8021q_info *vlan; 453 454 rndis_msg_size += NDIS_VLAN_PPI_SIZE; 455 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, 456 IEEE_8021Q_INFO); 457 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + 458 ppi->ppi_offset); 459 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; 460 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> 461 VLAN_PRIO_SHIFT; 462 } 463 464 net_trans_info = get_net_transport_info(skb, &hdr_offset); 465 if (net_trans_info == TRANSPORT_INFO_NOT_IP) 466 goto do_send; 467 468 /* 469 * Setup the sendside checksum offload only if this is not a 470 * GSO packet. 471 */ 472 if (skb_is_gso(skb)) 473 goto do_lso; 474 475 if ((skb->ip_summed == CHECKSUM_NONE) || 476 (skb->ip_summed == CHECKSUM_UNNECESSARY)) 477 goto do_send; 478 479 rndis_msg_size += NDIS_CSUM_PPI_SIZE; 480 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, 481 TCPIP_CHKSUM_PKTINFO); 482 483 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + 484 ppi->ppi_offset); 485 486 if (net_trans_info & (INFO_IPV4 << 16)) 487 csum_info->transmit.is_ipv4 = 1; 488 else 489 csum_info->transmit.is_ipv6 = 1; 490 491 if (net_trans_info & INFO_TCP) { 492 csum_info->transmit.tcp_checksum = 1; 493 csum_info->transmit.tcp_header_offset = hdr_offset; 494 } else if (net_trans_info & INFO_UDP) { 495 /* UDP checksum offload is not supported on ws2008r2. 496 * Furthermore, on ws2012 and ws2012r2, there are some 497 * issues with udp checksum offload from Linux guests. 498 * (these are host issues). 499 * For now compute the checksum here. 500 */ 501 struct udphdr *uh; 502 u16 udp_len; 503 504 ret = skb_cow_head(skb, 0); 505 if (ret) 506 goto drop; 507 508 uh = udp_hdr(skb); 509 udp_len = ntohs(uh->len); 510 uh->check = 0; 511 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, 512 ip_hdr(skb)->daddr, 513 udp_len, IPPROTO_UDP, 514 csum_partial(uh, udp_len, 0)); 515 if (uh->check == 0) 516 uh->check = CSUM_MANGLED_0; 517 518 csum_info->transmit.udp_checksum = 0; 519 } 520 goto do_send; 521 522 do_lso: 523 rndis_msg_size += NDIS_LSO_PPI_SIZE; 524 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, 525 TCP_LARGESEND_PKTINFO); 526 527 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + 528 ppi->ppi_offset); 529 530 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; 531 if (net_trans_info & (INFO_IPV4 << 16)) { 532 lso_info->lso_v2_transmit.ip_version = 533 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; 534 ip_hdr(skb)->tot_len = 0; 535 ip_hdr(skb)->check = 0; 536 tcp_hdr(skb)->check = 537 ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 538 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 539 } else { 540 lso_info->lso_v2_transmit.ip_version = 541 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; 542 ipv6_hdr(skb)->payload_len = 0; 543 tcp_hdr(skb)->check = 544 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 545 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 546 } 547 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; 548 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; 549 550 do_send: 551 /* Start filling in the page buffers with the rndis hdr */ 552 rndis_msg->msg_len += rndis_msg_size; 553 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, 554 skb, &packet->page_buf[0]); 555 556 ret = netvsc_send(net_device_ctx->device_ctx, packet); 557 558 drop: 559 if (ret == 0) { 560 net->stats.tx_bytes += skb_length; 561 net->stats.tx_packets++; 562 } else { 563 kfree(packet); 564 if (ret != -EAGAIN) { 565 dev_kfree_skb_any(skb); 566 net->stats.tx_dropped++; 567 } 568 } 569 570 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK; 571 } 572 573 /* 574 * netvsc_linkstatus_callback - Link up/down notification 575 */ 576 void netvsc_linkstatus_callback(struct hv_device *device_obj, 577 struct rndis_message *resp) 578 { 579 struct rndis_indicate_status *indicate = &resp->msg.indicate_status; 580 struct net_device *net; 581 struct net_device_context *ndev_ctx; 582 struct netvsc_device *net_device; 583 struct rndis_device *rdev; 584 585 net_device = hv_get_drvdata(device_obj); 586 rdev = net_device->extension; 587 588 switch (indicate->status) { 589 case RNDIS_STATUS_MEDIA_CONNECT: 590 rdev->link_state = false; 591 break; 592 case RNDIS_STATUS_MEDIA_DISCONNECT: 593 rdev->link_state = true; 594 break; 595 case RNDIS_STATUS_NETWORK_CHANGE: 596 rdev->link_change = true; 597 break; 598 default: 599 return; 600 } 601 602 net = net_device->ndev; 603 604 if (!net || net->reg_state != NETREG_REGISTERED) 605 return; 606 607 ndev_ctx = netdev_priv(net); 608 if (!rdev->link_state) { 609 schedule_delayed_work(&ndev_ctx->dwork, 0); 610 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); 611 } else { 612 schedule_delayed_work(&ndev_ctx->dwork, 0); 613 } 614 } 615 616 /* 617 * netvsc_recv_callback - Callback when we receive a packet from the 618 * "wire" on the specified device. 619 */ 620 int netvsc_recv_callback(struct hv_device *device_obj, 621 struct hv_netvsc_packet *packet, 622 struct ndis_tcp_ip_checksum_info *csum_info) 623 { 624 struct net_device *net; 625 struct sk_buff *skb; 626 627 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; 628 if (!net || net->reg_state != NETREG_REGISTERED) { 629 packet->status = NVSP_STAT_FAIL; 630 return 0; 631 } 632 633 /* Allocate a skb - TODO direct I/O to pages? */ 634 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); 635 if (unlikely(!skb)) { 636 ++net->stats.rx_dropped; 637 packet->status = NVSP_STAT_FAIL; 638 return 0; 639 } 640 641 /* 642 * Copy to skb. This copy is needed here since the memory pointed by 643 * hv_netvsc_packet cannot be deallocated 644 */ 645 memcpy(skb_put(skb, packet->total_data_buflen), packet->data, 646 packet->total_data_buflen); 647 648 skb->protocol = eth_type_trans(skb, net); 649 if (csum_info) { 650 /* We only look at the IP checksum here. 651 * Should we be dropping the packet if checksum 652 * failed? How do we deal with other checksums - TCP/UDP? 653 */ 654 if (csum_info->receive.ip_checksum_succeeded) 655 skb->ip_summed = CHECKSUM_UNNECESSARY; 656 else 657 skb->ip_summed = CHECKSUM_NONE; 658 } 659 660 if (packet->vlan_tci & VLAN_TAG_PRESENT) 661 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 662 packet->vlan_tci); 663 664 skb_record_rx_queue(skb, packet->channel-> 665 offermsg.offer.sub_channel_index); 666 667 net->stats.rx_packets++; 668 net->stats.rx_bytes += packet->total_data_buflen; 669 670 /* 671 * Pass the skb back up. Network stack will deallocate the skb when it 672 * is done. 673 * TODO - use NAPI? 674 */ 675 netif_rx(skb); 676 677 return 0; 678 } 679 680 static void netvsc_get_drvinfo(struct net_device *net, 681 struct ethtool_drvinfo *info) 682 { 683 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 684 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 685 } 686 687 static int netvsc_change_mtu(struct net_device *ndev, int mtu) 688 { 689 struct net_device_context *ndevctx = netdev_priv(ndev); 690 struct hv_device *hdev = ndevctx->device_ctx; 691 struct netvsc_device *nvdev = hv_get_drvdata(hdev); 692 struct netvsc_device_info device_info; 693 int limit = ETH_DATA_LEN; 694 695 if (nvdev == NULL || nvdev->destroy) 696 return -ENODEV; 697 698 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) 699 limit = NETVSC_MTU; 700 701 if (mtu < 68 || mtu > limit) 702 return -EINVAL; 703 704 nvdev->start_remove = true; 705 cancel_work_sync(&ndevctx->work); 706 netif_tx_disable(ndev); 707 rndis_filter_device_remove(hdev); 708 709 ndev->mtu = mtu; 710 711 ndevctx->device_ctx = hdev; 712 hv_set_drvdata(hdev, ndev); 713 device_info.ring_size = ring_size; 714 rndis_filter_device_add(hdev, &device_info); 715 netif_tx_wake_all_queues(ndev); 716 717 return 0; 718 } 719 720 721 static int netvsc_set_mac_addr(struct net_device *ndev, void *p) 722 { 723 struct net_device_context *ndevctx = netdev_priv(ndev); 724 struct hv_device *hdev = ndevctx->device_ctx; 725 struct sockaddr *addr = p; 726 char save_adr[ETH_ALEN]; 727 unsigned char save_aatype; 728 int err; 729 730 memcpy(save_adr, ndev->dev_addr, ETH_ALEN); 731 save_aatype = ndev->addr_assign_type; 732 733 err = eth_mac_addr(ndev, p); 734 if (err != 0) 735 return err; 736 737 err = rndis_filter_set_device_mac(hdev, addr->sa_data); 738 if (err != 0) { 739 /* roll back to saved MAC */ 740 memcpy(ndev->dev_addr, save_adr, ETH_ALEN); 741 ndev->addr_assign_type = save_aatype; 742 } 743 744 return err; 745 } 746 747 #ifdef CONFIG_NET_POLL_CONTROLLER 748 static void netvsc_poll_controller(struct net_device *net) 749 { 750 /* As netvsc_start_xmit() works synchronous we don't have to 751 * trigger anything here. 752 */ 753 } 754 #endif 755 756 static const struct ethtool_ops ethtool_ops = { 757 .get_drvinfo = netvsc_get_drvinfo, 758 .get_link = ethtool_op_get_link, 759 }; 760 761 static const struct net_device_ops device_ops = { 762 .ndo_open = netvsc_open, 763 .ndo_stop = netvsc_close, 764 .ndo_start_xmit = netvsc_start_xmit, 765 .ndo_set_rx_mode = netvsc_set_multicast_list, 766 .ndo_change_mtu = netvsc_change_mtu, 767 .ndo_validate_addr = eth_validate_addr, 768 .ndo_set_mac_address = netvsc_set_mac_addr, 769 .ndo_select_queue = netvsc_select_queue, 770 #ifdef CONFIG_NET_POLL_CONTROLLER 771 .ndo_poll_controller = netvsc_poll_controller, 772 #endif 773 }; 774 775 /* 776 * Send GARP packet to network peers after migrations. 777 * After Quick Migration, the network is not immediately operational in the 778 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add 779 * another netif_notify_peers() into a delayed work, otherwise GARP packet 780 * will not be sent after quick migration, and cause network disconnection. 781 * Also, we update the carrier status here. 782 */ 783 static void netvsc_link_change(struct work_struct *w) 784 { 785 struct net_device_context *ndev_ctx; 786 struct net_device *net; 787 struct netvsc_device *net_device; 788 struct rndis_device *rdev; 789 bool notify, refresh = false; 790 char *argv[] = { "/etc/init.d/network", "restart", NULL }; 791 char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; 792 793 rtnl_lock(); 794 795 ndev_ctx = container_of(w, struct net_device_context, dwork.work); 796 net_device = hv_get_drvdata(ndev_ctx->device_ctx); 797 rdev = net_device->extension; 798 net = net_device->ndev; 799 800 if (rdev->link_state) { 801 netif_carrier_off(net); 802 notify = false; 803 } else { 804 netif_carrier_on(net); 805 notify = true; 806 if (rdev->link_change) { 807 rdev->link_change = false; 808 refresh = true; 809 } 810 } 811 812 rtnl_unlock(); 813 814 if (refresh) 815 call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); 816 817 if (notify) 818 netdev_notify_peers(net); 819 } 820 821 822 static int netvsc_probe(struct hv_device *dev, 823 const struct hv_vmbus_device_id *dev_id) 824 { 825 struct net_device *net = NULL; 826 struct net_device_context *net_device_ctx; 827 struct netvsc_device_info device_info; 828 struct netvsc_device *nvdev; 829 int ret; 830 831 net = alloc_etherdev_mq(sizeof(struct net_device_context), 832 num_online_cpus()); 833 if (!net) 834 return -ENOMEM; 835 836 netif_carrier_off(net); 837 838 net_device_ctx = netdev_priv(net); 839 net_device_ctx->device_ctx = dev; 840 hv_set_drvdata(dev, net); 841 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); 842 INIT_WORK(&net_device_ctx->work, do_set_multicast); 843 844 net->netdev_ops = &device_ops; 845 846 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | 847 NETIF_F_TSO; 848 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | 849 NETIF_F_IP_CSUM | NETIF_F_TSO; 850 851 net->ethtool_ops = ðtool_ops; 852 SET_NETDEV_DEV(net, &dev->device); 853 854 /* Notify the netvsc driver of the new device */ 855 device_info.ring_size = ring_size; 856 ret = rndis_filter_device_add(dev, &device_info); 857 if (ret != 0) { 858 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); 859 free_netdev(net); 860 hv_set_drvdata(dev, NULL); 861 return ret; 862 } 863 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); 864 865 nvdev = hv_get_drvdata(dev); 866 netif_set_real_num_tx_queues(net, nvdev->num_chn); 867 netif_set_real_num_rx_queues(net, nvdev->num_chn); 868 869 ret = register_netdev(net); 870 if (ret != 0) { 871 pr_err("Unable to register netdev.\n"); 872 rndis_filter_device_remove(dev); 873 free_netdev(net); 874 } else { 875 schedule_delayed_work(&net_device_ctx->dwork, 0); 876 } 877 878 return ret; 879 } 880 881 static int netvsc_remove(struct hv_device *dev) 882 { 883 struct net_device *net; 884 struct net_device_context *ndev_ctx; 885 struct netvsc_device *net_device; 886 887 net_device = hv_get_drvdata(dev); 888 net = net_device->ndev; 889 890 if (net == NULL) { 891 dev_err(&dev->device, "No net device to remove\n"); 892 return 0; 893 } 894 895 net_device->start_remove = true; 896 897 ndev_ctx = netdev_priv(net); 898 cancel_delayed_work_sync(&ndev_ctx->dwork); 899 cancel_work_sync(&ndev_ctx->work); 900 901 /* Stop outbound asap */ 902 netif_tx_disable(net); 903 904 unregister_netdev(net); 905 906 /* 907 * Call to the vsc driver to let it know that the device is being 908 * removed 909 */ 910 rndis_filter_device_remove(dev); 911 912 free_netdev(net); 913 return 0; 914 } 915 916 static const struct hv_vmbus_device_id id_table[] = { 917 /* Network guid */ 918 { HV_NIC_GUID, }, 919 { }, 920 }; 921 922 MODULE_DEVICE_TABLE(vmbus, id_table); 923 924 /* The one and only one */ 925 static struct hv_driver netvsc_drv = { 926 .name = KBUILD_MODNAME, 927 .id_table = id_table, 928 .probe = netvsc_probe, 929 .remove = netvsc_remove, 930 }; 931 932 static void __exit netvsc_drv_exit(void) 933 { 934 vmbus_driver_unregister(&netvsc_drv); 935 } 936 937 static int __init netvsc_drv_init(void) 938 { 939 if (ring_size < RING_SIZE_MIN) { 940 ring_size = RING_SIZE_MIN; 941 pr_info("Increased ring_size to %d (min allowed)\n", 942 ring_size); 943 } 944 return vmbus_driver_register(&netvsc_drv); 945 } 946 947 MODULE_LICENSE("GPL"); 948 MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); 949 950 module_init(netvsc_drv_init); 951 module_exit(netvsc_drv_exit); 952