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, u8 *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 = 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 iphdr *iphdr; 194 int data_len; 195 bool ret = false; 196 197 if (eth_hdr(skb)->h_proto != htons(ETH_P_IP)) 198 return false; 199 200 iphdr = ip_hdr(skb); 201 202 if (iphdr->version == 4) { 203 if (iphdr->protocol == IPPROTO_TCP) 204 data_len = 12; 205 else 206 data_len = 8; 207 *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN, 208 (u8 *)&iphdr->saddr, data_len); 209 ret = true; 210 } 211 212 return ret; 213 } 214 215 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb, 216 void *accel_priv, select_queue_fallback_t fallback) 217 { 218 struct net_device_context *net_device_ctx = netdev_priv(ndev); 219 struct hv_device *hdev = net_device_ctx->device_ctx; 220 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev); 221 u32 hash; 222 u16 q_idx = 0; 223 224 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1) 225 return 0; 226 227 if (netvsc_set_hash(&hash, skb)) { 228 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] % 229 ndev->real_num_tx_queues; 230 skb_set_hash(skb, hash, PKT_HASH_TYPE_L3); 231 } 232 233 return q_idx; 234 } 235 236 static void netvsc_xmit_completion(void *context) 237 { 238 struct hv_netvsc_packet *packet = (struct hv_netvsc_packet *)context; 239 struct sk_buff *skb = (struct sk_buff *) 240 (unsigned long)packet->send_completion_tid; 241 u32 index = packet->send_buf_index; 242 243 kfree(packet); 244 245 if (skb && (index == NETVSC_INVALID_INDEX)) 246 dev_kfree_skb_any(skb); 247 } 248 249 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len, 250 struct hv_page_buffer *pb) 251 { 252 int j = 0; 253 254 /* Deal with compund pages by ignoring unused part 255 * of the page. 256 */ 257 page += (offset >> PAGE_SHIFT); 258 offset &= ~PAGE_MASK; 259 260 while (len > 0) { 261 unsigned long bytes; 262 263 bytes = PAGE_SIZE - offset; 264 if (bytes > len) 265 bytes = len; 266 pb[j].pfn = page_to_pfn(page); 267 pb[j].offset = offset; 268 pb[j].len = bytes; 269 270 offset += bytes; 271 len -= bytes; 272 273 if (offset == PAGE_SIZE && len) { 274 page++; 275 offset = 0; 276 j++; 277 } 278 } 279 280 return j + 1; 281 } 282 283 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb, 284 struct hv_page_buffer *pb) 285 { 286 u32 slots_used = 0; 287 char *data = skb->data; 288 int frags = skb_shinfo(skb)->nr_frags; 289 int i; 290 291 /* The packet is laid out thus: 292 * 1. hdr 293 * 2. skb linear data 294 * 3. skb fragment data 295 */ 296 if (hdr != NULL) 297 slots_used += fill_pg_buf(virt_to_page(hdr), 298 offset_in_page(hdr), 299 len, &pb[slots_used]); 300 301 slots_used += fill_pg_buf(virt_to_page(data), 302 offset_in_page(data), 303 skb_headlen(skb), &pb[slots_used]); 304 305 for (i = 0; i < frags; i++) { 306 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 307 308 slots_used += fill_pg_buf(skb_frag_page(frag), 309 frag->page_offset, 310 skb_frag_size(frag), &pb[slots_used]); 311 } 312 return slots_used; 313 } 314 315 static int count_skb_frag_slots(struct sk_buff *skb) 316 { 317 int i, frags = skb_shinfo(skb)->nr_frags; 318 int pages = 0; 319 320 for (i = 0; i < frags; i++) { 321 skb_frag_t *frag = skb_shinfo(skb)->frags + i; 322 unsigned long size = skb_frag_size(frag); 323 unsigned long offset = frag->page_offset; 324 325 /* Skip unused frames from start of page */ 326 offset &= ~PAGE_MASK; 327 pages += PFN_UP(offset + size); 328 } 329 return pages; 330 } 331 332 static int netvsc_get_slots(struct sk_buff *skb) 333 { 334 char *data = skb->data; 335 unsigned int offset = offset_in_page(data); 336 unsigned int len = skb_headlen(skb); 337 int slots; 338 int frag_slots; 339 340 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE); 341 frag_slots = count_skb_frag_slots(skb); 342 return slots + frag_slots; 343 } 344 345 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off) 346 { 347 u32 ret_val = TRANSPORT_INFO_NOT_IP; 348 349 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) && 350 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) { 351 goto not_ip; 352 } 353 354 *trans_off = skb_transport_offset(skb); 355 356 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) { 357 struct iphdr *iphdr = ip_hdr(skb); 358 359 if (iphdr->protocol == IPPROTO_TCP) 360 ret_val = TRANSPORT_INFO_IPV4_TCP; 361 else if (iphdr->protocol == IPPROTO_UDP) 362 ret_val = TRANSPORT_INFO_IPV4_UDP; 363 } else { 364 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) 365 ret_val = TRANSPORT_INFO_IPV6_TCP; 366 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP) 367 ret_val = TRANSPORT_INFO_IPV6_UDP; 368 } 369 370 not_ip: 371 return ret_val; 372 } 373 374 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) 375 { 376 struct net_device_context *net_device_ctx = netdev_priv(net); 377 struct hv_netvsc_packet *packet; 378 int ret; 379 unsigned int num_data_pgs; 380 struct rndis_message *rndis_msg; 381 struct rndis_packet *rndis_pkt; 382 u32 rndis_msg_size; 383 bool isvlan; 384 struct rndis_per_packet_info *ppi; 385 struct ndis_tcp_ip_checksum_info *csum_info; 386 struct ndis_tcp_lso_info *lso_info; 387 int hdr_offset; 388 u32 net_trans_info; 389 u32 hash; 390 391 392 /* We will atmost need two pages to describe the rndis 393 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number 394 * of pages in a single packet. 395 */ 396 num_data_pgs = netvsc_get_slots(skb) + 2; 397 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { 398 netdev_err(net, "Packet too big: %u\n", skb->len); 399 dev_kfree_skb(skb); 400 net->stats.tx_dropped++; 401 return NETDEV_TX_OK; 402 } 403 404 /* Allocate a netvsc packet based on # of frags. */ 405 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 406 (num_data_pgs * sizeof(struct hv_page_buffer)) + 407 sizeof(struct rndis_message) + 408 NDIS_VLAN_PPI_SIZE + NDIS_CSUM_PPI_SIZE + 409 NDIS_LSO_PPI_SIZE + NDIS_HASH_PPI_SIZE, GFP_ATOMIC); 410 if (!packet) { 411 /* out of memory, drop packet */ 412 netdev_err(net, "unable to allocate hv_netvsc_packet\n"); 413 414 dev_kfree_skb(skb); 415 net->stats.tx_dropped++; 416 return NETDEV_TX_OK; 417 } 418 419 packet->vlan_tci = skb->vlan_tci; 420 421 packet->q_idx = skb_get_queue_mapping(skb); 422 423 packet->is_data_pkt = true; 424 packet->total_data_buflen = skb->len; 425 426 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + 427 sizeof(struct hv_netvsc_packet) + 428 (num_data_pgs * sizeof(struct hv_page_buffer))); 429 430 /* Set the completion routine */ 431 packet->send_completion = netvsc_xmit_completion; 432 packet->send_completion_ctx = packet; 433 packet->send_completion_tid = (unsigned long)skb; 434 435 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; 436 437 /* Add the rndis header */ 438 rndis_msg = packet->rndis_msg; 439 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; 440 rndis_msg->msg_len = packet->total_data_buflen; 441 rndis_pkt = &rndis_msg->msg.pkt; 442 rndis_pkt->data_offset = sizeof(struct rndis_packet); 443 rndis_pkt->data_len = packet->total_data_buflen; 444 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); 445 446 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); 447 448 hash = skb_get_hash_raw(skb); 449 if (hash != 0 && net->real_num_tx_queues > 1) { 450 rndis_msg_size += NDIS_HASH_PPI_SIZE; 451 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, 452 NBL_HASH_VALUE); 453 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash; 454 } 455 456 if (isvlan) { 457 struct ndis_pkt_8021q_info *vlan; 458 459 rndis_msg_size += NDIS_VLAN_PPI_SIZE; 460 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, 461 IEEE_8021Q_INFO); 462 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + 463 ppi->ppi_offset); 464 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; 465 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> 466 VLAN_PRIO_SHIFT; 467 } 468 469 net_trans_info = get_net_transport_info(skb, &hdr_offset); 470 if (net_trans_info == TRANSPORT_INFO_NOT_IP) 471 goto do_send; 472 473 /* 474 * Setup the sendside checksum offload only if this is not a 475 * GSO packet. 476 */ 477 if (skb_is_gso(skb)) 478 goto do_lso; 479 480 if ((skb->ip_summed == CHECKSUM_NONE) || 481 (skb->ip_summed == CHECKSUM_UNNECESSARY)) 482 goto do_send; 483 484 rndis_msg_size += NDIS_CSUM_PPI_SIZE; 485 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, 486 TCPIP_CHKSUM_PKTINFO); 487 488 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + 489 ppi->ppi_offset); 490 491 if (net_trans_info & (INFO_IPV4 << 16)) 492 csum_info->transmit.is_ipv4 = 1; 493 else 494 csum_info->transmit.is_ipv6 = 1; 495 496 if (net_trans_info & INFO_TCP) { 497 csum_info->transmit.tcp_checksum = 1; 498 csum_info->transmit.tcp_header_offset = hdr_offset; 499 } else if (net_trans_info & INFO_UDP) { 500 /* UDP checksum offload is not supported on ws2008r2. 501 * Furthermore, on ws2012 and ws2012r2, there are some 502 * issues with udp checksum offload from Linux guests. 503 * (these are host issues). 504 * For now compute the checksum here. 505 */ 506 struct udphdr *uh; 507 u16 udp_len; 508 509 ret = skb_cow_head(skb, 0); 510 if (ret) 511 goto drop; 512 513 uh = udp_hdr(skb); 514 udp_len = ntohs(uh->len); 515 uh->check = 0; 516 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, 517 ip_hdr(skb)->daddr, 518 udp_len, IPPROTO_UDP, 519 csum_partial(uh, udp_len, 0)); 520 if (uh->check == 0) 521 uh->check = CSUM_MANGLED_0; 522 523 csum_info->transmit.udp_checksum = 0; 524 } 525 goto do_send; 526 527 do_lso: 528 rndis_msg_size += NDIS_LSO_PPI_SIZE; 529 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, 530 TCP_LARGESEND_PKTINFO); 531 532 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + 533 ppi->ppi_offset); 534 535 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; 536 if (net_trans_info & (INFO_IPV4 << 16)) { 537 lso_info->lso_v2_transmit.ip_version = 538 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; 539 ip_hdr(skb)->tot_len = 0; 540 ip_hdr(skb)->check = 0; 541 tcp_hdr(skb)->check = 542 ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 543 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 544 } else { 545 lso_info->lso_v2_transmit.ip_version = 546 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; 547 ipv6_hdr(skb)->payload_len = 0; 548 tcp_hdr(skb)->check = 549 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 550 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 551 } 552 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; 553 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; 554 555 do_send: 556 /* Start filling in the page buffers with the rndis hdr */ 557 rndis_msg->msg_len += rndis_msg_size; 558 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, 559 skb, &packet->page_buf[0]); 560 561 ret = netvsc_send(net_device_ctx->device_ctx, packet); 562 563 drop: 564 if (ret == 0) { 565 net->stats.tx_bytes += skb->len; 566 net->stats.tx_packets++; 567 } else { 568 kfree(packet); 569 if (ret != -EAGAIN) { 570 dev_kfree_skb_any(skb); 571 net->stats.tx_dropped++; 572 } 573 } 574 575 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK; 576 } 577 578 /* 579 * netvsc_linkstatus_callback - Link up/down notification 580 */ 581 void netvsc_linkstatus_callback(struct hv_device *device_obj, 582 struct rndis_message *resp) 583 { 584 struct rndis_indicate_status *indicate = &resp->msg.indicate_status; 585 struct net_device *net; 586 struct net_device_context *ndev_ctx; 587 struct netvsc_device *net_device; 588 struct rndis_device *rdev; 589 590 net_device = hv_get_drvdata(device_obj); 591 rdev = net_device->extension; 592 593 switch (indicate->status) { 594 case RNDIS_STATUS_MEDIA_CONNECT: 595 rdev->link_state = false; 596 break; 597 case RNDIS_STATUS_MEDIA_DISCONNECT: 598 rdev->link_state = true; 599 break; 600 case RNDIS_STATUS_NETWORK_CHANGE: 601 rdev->link_change = true; 602 break; 603 default: 604 return; 605 } 606 607 net = net_device->ndev; 608 609 if (!net || net->reg_state != NETREG_REGISTERED) 610 return; 611 612 ndev_ctx = netdev_priv(net); 613 if (!rdev->link_state) { 614 schedule_delayed_work(&ndev_ctx->dwork, 0); 615 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); 616 } else { 617 schedule_delayed_work(&ndev_ctx->dwork, 0); 618 } 619 } 620 621 /* 622 * netvsc_recv_callback - Callback when we receive a packet from the 623 * "wire" on the specified device. 624 */ 625 int netvsc_recv_callback(struct hv_device *device_obj, 626 struct hv_netvsc_packet *packet, 627 struct ndis_tcp_ip_checksum_info *csum_info) 628 { 629 struct net_device *net; 630 struct sk_buff *skb; 631 632 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; 633 if (!net || net->reg_state != NETREG_REGISTERED) { 634 packet->status = NVSP_STAT_FAIL; 635 return 0; 636 } 637 638 /* Allocate a skb - TODO direct I/O to pages? */ 639 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); 640 if (unlikely(!skb)) { 641 ++net->stats.rx_dropped; 642 packet->status = NVSP_STAT_FAIL; 643 return 0; 644 } 645 646 /* 647 * Copy to skb. This copy is needed here since the memory pointed by 648 * hv_netvsc_packet cannot be deallocated 649 */ 650 memcpy(skb_put(skb, packet->total_data_buflen), packet->data, 651 packet->total_data_buflen); 652 653 skb->protocol = eth_type_trans(skb, net); 654 if (csum_info) { 655 /* We only look at the IP checksum here. 656 * Should we be dropping the packet if checksum 657 * failed? How do we deal with other checksums - TCP/UDP? 658 */ 659 if (csum_info->receive.ip_checksum_succeeded) 660 skb->ip_summed = CHECKSUM_UNNECESSARY; 661 else 662 skb->ip_summed = CHECKSUM_NONE; 663 } 664 665 if (packet->vlan_tci & VLAN_TAG_PRESENT) 666 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 667 packet->vlan_tci); 668 669 skb_record_rx_queue(skb, packet->channel-> 670 offermsg.offer.sub_channel_index); 671 672 net->stats.rx_packets++; 673 net->stats.rx_bytes += packet->total_data_buflen; 674 675 /* 676 * Pass the skb back up. Network stack will deallocate the skb when it 677 * is done. 678 * TODO - use NAPI? 679 */ 680 netif_rx(skb); 681 682 return 0; 683 } 684 685 static void netvsc_get_drvinfo(struct net_device *net, 686 struct ethtool_drvinfo *info) 687 { 688 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 689 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 690 } 691 692 static int netvsc_change_mtu(struct net_device *ndev, int mtu) 693 { 694 struct net_device_context *ndevctx = netdev_priv(ndev); 695 struct hv_device *hdev = ndevctx->device_ctx; 696 struct netvsc_device *nvdev = hv_get_drvdata(hdev); 697 struct netvsc_device_info device_info; 698 int limit = ETH_DATA_LEN; 699 700 if (nvdev == NULL || nvdev->destroy) 701 return -ENODEV; 702 703 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) 704 limit = NETVSC_MTU; 705 706 if (mtu < 68 || mtu > limit) 707 return -EINVAL; 708 709 nvdev->start_remove = true; 710 cancel_work_sync(&ndevctx->work); 711 netif_tx_disable(ndev); 712 rndis_filter_device_remove(hdev); 713 714 ndev->mtu = mtu; 715 716 ndevctx->device_ctx = hdev; 717 hv_set_drvdata(hdev, ndev); 718 device_info.ring_size = ring_size; 719 rndis_filter_device_add(hdev, &device_info); 720 netif_tx_wake_all_queues(ndev); 721 722 return 0; 723 } 724 725 726 static int netvsc_set_mac_addr(struct net_device *ndev, void *p) 727 { 728 struct net_device_context *ndevctx = netdev_priv(ndev); 729 struct hv_device *hdev = ndevctx->device_ctx; 730 struct sockaddr *addr = p; 731 char save_adr[ETH_ALEN]; 732 unsigned char save_aatype; 733 int err; 734 735 memcpy(save_adr, ndev->dev_addr, ETH_ALEN); 736 save_aatype = ndev->addr_assign_type; 737 738 err = eth_mac_addr(ndev, p); 739 if (err != 0) 740 return err; 741 742 err = rndis_filter_set_device_mac(hdev, addr->sa_data); 743 if (err != 0) { 744 /* roll back to saved MAC */ 745 memcpy(ndev->dev_addr, save_adr, ETH_ALEN); 746 ndev->addr_assign_type = save_aatype; 747 } 748 749 return err; 750 } 751 752 #ifdef CONFIG_NET_POLL_CONTROLLER 753 static void netvsc_poll_controller(struct net_device *net) 754 { 755 /* As netvsc_start_xmit() works synchronous we don't have to 756 * trigger anything here. 757 */ 758 } 759 #endif 760 761 static const struct ethtool_ops ethtool_ops = { 762 .get_drvinfo = netvsc_get_drvinfo, 763 .get_link = ethtool_op_get_link, 764 }; 765 766 static const struct net_device_ops device_ops = { 767 .ndo_open = netvsc_open, 768 .ndo_stop = netvsc_close, 769 .ndo_start_xmit = netvsc_start_xmit, 770 .ndo_set_rx_mode = netvsc_set_multicast_list, 771 .ndo_change_mtu = netvsc_change_mtu, 772 .ndo_validate_addr = eth_validate_addr, 773 .ndo_set_mac_address = netvsc_set_mac_addr, 774 .ndo_select_queue = netvsc_select_queue, 775 #ifdef CONFIG_NET_POLL_CONTROLLER 776 .ndo_poll_controller = netvsc_poll_controller, 777 #endif 778 }; 779 780 /* 781 * Send GARP packet to network peers after migrations. 782 * After Quick Migration, the network is not immediately operational in the 783 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add 784 * another netif_notify_peers() into a delayed work, otherwise GARP packet 785 * will not be sent after quick migration, and cause network disconnection. 786 * Also, we update the carrier status here. 787 */ 788 static void netvsc_link_change(struct work_struct *w) 789 { 790 struct net_device_context *ndev_ctx; 791 struct net_device *net; 792 struct netvsc_device *net_device; 793 struct rndis_device *rdev; 794 bool notify, refresh = false; 795 char *argv[] = { "/etc/init.d/network", "restart", NULL }; 796 char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; 797 798 rtnl_lock(); 799 800 ndev_ctx = container_of(w, struct net_device_context, dwork.work); 801 net_device = hv_get_drvdata(ndev_ctx->device_ctx); 802 rdev = net_device->extension; 803 net = net_device->ndev; 804 805 if (rdev->link_state) { 806 netif_carrier_off(net); 807 notify = false; 808 } else { 809 netif_carrier_on(net); 810 notify = true; 811 if (rdev->link_change) { 812 rdev->link_change = false; 813 refresh = true; 814 } 815 } 816 817 rtnl_unlock(); 818 819 if (refresh) 820 call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); 821 822 if (notify) 823 netdev_notify_peers(net); 824 } 825 826 827 static int netvsc_probe(struct hv_device *dev, 828 const struct hv_vmbus_device_id *dev_id) 829 { 830 struct net_device *net = NULL; 831 struct net_device_context *net_device_ctx; 832 struct netvsc_device_info device_info; 833 struct netvsc_device *nvdev; 834 int ret; 835 836 net = alloc_etherdev_mq(sizeof(struct net_device_context), 837 num_online_cpus()); 838 if (!net) 839 return -ENOMEM; 840 841 netif_carrier_off(net); 842 843 net_device_ctx = netdev_priv(net); 844 net_device_ctx->device_ctx = dev; 845 hv_set_drvdata(dev, net); 846 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); 847 INIT_WORK(&net_device_ctx->work, do_set_multicast); 848 849 net->netdev_ops = &device_ops; 850 851 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | 852 NETIF_F_TSO; 853 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | 854 NETIF_F_IP_CSUM | NETIF_F_TSO; 855 856 net->ethtool_ops = ðtool_ops; 857 SET_NETDEV_DEV(net, &dev->device); 858 859 /* Notify the netvsc driver of the new device */ 860 device_info.ring_size = ring_size; 861 ret = rndis_filter_device_add(dev, &device_info); 862 if (ret != 0) { 863 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); 864 free_netdev(net); 865 hv_set_drvdata(dev, NULL); 866 return ret; 867 } 868 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); 869 870 nvdev = hv_get_drvdata(dev); 871 netif_set_real_num_tx_queues(net, nvdev->num_chn); 872 netif_set_real_num_rx_queues(net, nvdev->num_chn); 873 874 ret = register_netdev(net); 875 if (ret != 0) { 876 pr_err("Unable to register netdev.\n"); 877 rndis_filter_device_remove(dev); 878 free_netdev(net); 879 } else { 880 schedule_delayed_work(&net_device_ctx->dwork, 0); 881 } 882 883 return ret; 884 } 885 886 static int netvsc_remove(struct hv_device *dev) 887 { 888 struct net_device *net; 889 struct net_device_context *ndev_ctx; 890 struct netvsc_device *net_device; 891 892 net_device = hv_get_drvdata(dev); 893 net = net_device->ndev; 894 895 if (net == NULL) { 896 dev_err(&dev->device, "No net device to remove\n"); 897 return 0; 898 } 899 900 net_device->start_remove = true; 901 902 ndev_ctx = netdev_priv(net); 903 cancel_delayed_work_sync(&ndev_ctx->dwork); 904 cancel_work_sync(&ndev_ctx->work); 905 906 /* Stop outbound asap */ 907 netif_tx_disable(net); 908 909 unregister_netdev(net); 910 911 /* 912 * Call to the vsc driver to let it know that the device is being 913 * removed 914 */ 915 rndis_filter_device_remove(dev); 916 917 free_netdev(net); 918 return 0; 919 } 920 921 static const struct hv_vmbus_device_id id_table[] = { 922 /* Network guid */ 923 { HV_NIC_GUID, }, 924 { }, 925 }; 926 927 MODULE_DEVICE_TABLE(vmbus, id_table); 928 929 /* The one and only one */ 930 static struct hv_driver netvsc_drv = { 931 .name = KBUILD_MODNAME, 932 .id_table = id_table, 933 .probe = netvsc_probe, 934 .remove = netvsc_remove, 935 }; 936 937 static void __exit netvsc_drv_exit(void) 938 { 939 vmbus_driver_unregister(&netvsc_drv); 940 } 941 942 static int __init netvsc_drv_init(void) 943 { 944 if (ring_size < RING_SIZE_MIN) { 945 ring_size = RING_SIZE_MIN; 946 pr_info("Increased ring_size to %d (min allowed)\n", 947 ring_size); 948 } 949 return vmbus_driver_register(&netvsc_drv); 950 } 951 952 MODULE_LICENSE("GPL"); 953 MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); 954 955 module_init(netvsc_drv_init); 956 module_exit(netvsc_drv_exit); 957