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 u32 skb_length = skb->len; 391 392 393 /* We will atmost need two pages to describe the rndis 394 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number 395 * of pages in a single packet. 396 */ 397 num_data_pgs = netvsc_get_slots(skb) + 2; 398 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) { 399 netdev_err(net, "Packet too big: %u\n", skb->len); 400 dev_kfree_skb(skb); 401 net->stats.tx_dropped++; 402 return NETDEV_TX_OK; 403 } 404 405 /* Allocate a netvsc packet based on # of frags. */ 406 packet = kzalloc(sizeof(struct hv_netvsc_packet) + 407 (num_data_pgs * sizeof(struct hv_page_buffer)) + 408 sizeof(struct rndis_message) + 409 NDIS_VLAN_PPI_SIZE + NDIS_CSUM_PPI_SIZE + 410 NDIS_LSO_PPI_SIZE + NDIS_HASH_PPI_SIZE, GFP_ATOMIC); 411 if (!packet) { 412 /* out of memory, drop packet */ 413 netdev_err(net, "unable to allocate hv_netvsc_packet\n"); 414 415 dev_kfree_skb(skb); 416 net->stats.tx_dropped++; 417 return NETDEV_TX_OK; 418 } 419 420 packet->vlan_tci = skb->vlan_tci; 421 422 packet->q_idx = skb_get_queue_mapping(skb); 423 424 packet->is_data_pkt = true; 425 packet->total_data_buflen = skb->len; 426 427 packet->rndis_msg = (struct rndis_message *)((unsigned long)packet + 428 sizeof(struct hv_netvsc_packet) + 429 (num_data_pgs * sizeof(struct hv_page_buffer))); 430 431 /* Set the completion routine */ 432 packet->send_completion = netvsc_xmit_completion; 433 packet->send_completion_ctx = packet; 434 packet->send_completion_tid = (unsigned long)skb; 435 436 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT; 437 438 /* Add the rndis header */ 439 rndis_msg = packet->rndis_msg; 440 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET; 441 rndis_msg->msg_len = packet->total_data_buflen; 442 rndis_pkt = &rndis_msg->msg.pkt; 443 rndis_pkt->data_offset = sizeof(struct rndis_packet); 444 rndis_pkt->data_len = packet->total_data_buflen; 445 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet); 446 447 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet); 448 449 hash = skb_get_hash_raw(skb); 450 if (hash != 0 && net->real_num_tx_queues > 1) { 451 rndis_msg_size += NDIS_HASH_PPI_SIZE; 452 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE, 453 NBL_HASH_VALUE); 454 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash; 455 } 456 457 if (isvlan) { 458 struct ndis_pkt_8021q_info *vlan; 459 460 rndis_msg_size += NDIS_VLAN_PPI_SIZE; 461 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE, 462 IEEE_8021Q_INFO); 463 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi + 464 ppi->ppi_offset); 465 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK; 466 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >> 467 VLAN_PRIO_SHIFT; 468 } 469 470 net_trans_info = get_net_transport_info(skb, &hdr_offset); 471 if (net_trans_info == TRANSPORT_INFO_NOT_IP) 472 goto do_send; 473 474 /* 475 * Setup the sendside checksum offload only if this is not a 476 * GSO packet. 477 */ 478 if (skb_is_gso(skb)) 479 goto do_lso; 480 481 if ((skb->ip_summed == CHECKSUM_NONE) || 482 (skb->ip_summed == CHECKSUM_UNNECESSARY)) 483 goto do_send; 484 485 rndis_msg_size += NDIS_CSUM_PPI_SIZE; 486 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE, 487 TCPIP_CHKSUM_PKTINFO); 488 489 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi + 490 ppi->ppi_offset); 491 492 if (net_trans_info & (INFO_IPV4 << 16)) 493 csum_info->transmit.is_ipv4 = 1; 494 else 495 csum_info->transmit.is_ipv6 = 1; 496 497 if (net_trans_info & INFO_TCP) { 498 csum_info->transmit.tcp_checksum = 1; 499 csum_info->transmit.tcp_header_offset = hdr_offset; 500 } else if (net_trans_info & INFO_UDP) { 501 /* UDP checksum offload is not supported on ws2008r2. 502 * Furthermore, on ws2012 and ws2012r2, there are some 503 * issues with udp checksum offload from Linux guests. 504 * (these are host issues). 505 * For now compute the checksum here. 506 */ 507 struct udphdr *uh; 508 u16 udp_len; 509 510 ret = skb_cow_head(skb, 0); 511 if (ret) 512 goto drop; 513 514 uh = udp_hdr(skb); 515 udp_len = ntohs(uh->len); 516 uh->check = 0; 517 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr, 518 ip_hdr(skb)->daddr, 519 udp_len, IPPROTO_UDP, 520 csum_partial(uh, udp_len, 0)); 521 if (uh->check == 0) 522 uh->check = CSUM_MANGLED_0; 523 524 csum_info->transmit.udp_checksum = 0; 525 } 526 goto do_send; 527 528 do_lso: 529 rndis_msg_size += NDIS_LSO_PPI_SIZE; 530 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE, 531 TCP_LARGESEND_PKTINFO); 532 533 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi + 534 ppi->ppi_offset); 535 536 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE; 537 if (net_trans_info & (INFO_IPV4 << 16)) { 538 lso_info->lso_v2_transmit.ip_version = 539 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4; 540 ip_hdr(skb)->tot_len = 0; 541 ip_hdr(skb)->check = 0; 542 tcp_hdr(skb)->check = 543 ~csum_tcpudp_magic(ip_hdr(skb)->saddr, 544 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 545 } else { 546 lso_info->lso_v2_transmit.ip_version = 547 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6; 548 ipv6_hdr(skb)->payload_len = 0; 549 tcp_hdr(skb)->check = 550 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 551 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0); 552 } 553 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset; 554 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size; 555 556 do_send: 557 /* Start filling in the page buffers with the rndis hdr */ 558 rndis_msg->msg_len += rndis_msg_size; 559 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size, 560 skb, &packet->page_buf[0]); 561 562 ret = netvsc_send(net_device_ctx->device_ctx, packet); 563 564 drop: 565 if (ret == 0) { 566 net->stats.tx_bytes += skb_length; 567 net->stats.tx_packets++; 568 } else { 569 kfree(packet); 570 if (ret != -EAGAIN) { 571 dev_kfree_skb_any(skb); 572 net->stats.tx_dropped++; 573 } 574 } 575 576 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK; 577 } 578 579 /* 580 * netvsc_linkstatus_callback - Link up/down notification 581 */ 582 void netvsc_linkstatus_callback(struct hv_device *device_obj, 583 struct rndis_message *resp) 584 { 585 struct rndis_indicate_status *indicate = &resp->msg.indicate_status; 586 struct net_device *net; 587 struct net_device_context *ndev_ctx; 588 struct netvsc_device *net_device; 589 struct rndis_device *rdev; 590 591 net_device = hv_get_drvdata(device_obj); 592 rdev = net_device->extension; 593 594 switch (indicate->status) { 595 case RNDIS_STATUS_MEDIA_CONNECT: 596 rdev->link_state = false; 597 break; 598 case RNDIS_STATUS_MEDIA_DISCONNECT: 599 rdev->link_state = true; 600 break; 601 case RNDIS_STATUS_NETWORK_CHANGE: 602 rdev->link_change = true; 603 break; 604 default: 605 return; 606 } 607 608 net = net_device->ndev; 609 610 if (!net || net->reg_state != NETREG_REGISTERED) 611 return; 612 613 ndev_ctx = netdev_priv(net); 614 if (!rdev->link_state) { 615 schedule_delayed_work(&ndev_ctx->dwork, 0); 616 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20)); 617 } else { 618 schedule_delayed_work(&ndev_ctx->dwork, 0); 619 } 620 } 621 622 /* 623 * netvsc_recv_callback - Callback when we receive a packet from the 624 * "wire" on the specified device. 625 */ 626 int netvsc_recv_callback(struct hv_device *device_obj, 627 struct hv_netvsc_packet *packet, 628 struct ndis_tcp_ip_checksum_info *csum_info) 629 { 630 struct net_device *net; 631 struct sk_buff *skb; 632 633 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev; 634 if (!net || net->reg_state != NETREG_REGISTERED) { 635 packet->status = NVSP_STAT_FAIL; 636 return 0; 637 } 638 639 /* Allocate a skb - TODO direct I/O to pages? */ 640 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen); 641 if (unlikely(!skb)) { 642 ++net->stats.rx_dropped; 643 packet->status = NVSP_STAT_FAIL; 644 return 0; 645 } 646 647 /* 648 * Copy to skb. This copy is needed here since the memory pointed by 649 * hv_netvsc_packet cannot be deallocated 650 */ 651 memcpy(skb_put(skb, packet->total_data_buflen), packet->data, 652 packet->total_data_buflen); 653 654 skb->protocol = eth_type_trans(skb, net); 655 if (csum_info) { 656 /* We only look at the IP checksum here. 657 * Should we be dropping the packet if checksum 658 * failed? How do we deal with other checksums - TCP/UDP? 659 */ 660 if (csum_info->receive.ip_checksum_succeeded) 661 skb->ip_summed = CHECKSUM_UNNECESSARY; 662 else 663 skb->ip_summed = CHECKSUM_NONE; 664 } 665 666 if (packet->vlan_tci & VLAN_TAG_PRESENT) 667 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), 668 packet->vlan_tci); 669 670 skb_record_rx_queue(skb, packet->channel-> 671 offermsg.offer.sub_channel_index); 672 673 net->stats.rx_packets++; 674 net->stats.rx_bytes += packet->total_data_buflen; 675 676 /* 677 * Pass the skb back up. Network stack will deallocate the skb when it 678 * is done. 679 * TODO - use NAPI? 680 */ 681 netif_rx(skb); 682 683 return 0; 684 } 685 686 static void netvsc_get_drvinfo(struct net_device *net, 687 struct ethtool_drvinfo *info) 688 { 689 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 690 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 691 } 692 693 static int netvsc_change_mtu(struct net_device *ndev, int mtu) 694 { 695 struct net_device_context *ndevctx = netdev_priv(ndev); 696 struct hv_device *hdev = ndevctx->device_ctx; 697 struct netvsc_device *nvdev = hv_get_drvdata(hdev); 698 struct netvsc_device_info device_info; 699 int limit = ETH_DATA_LEN; 700 701 if (nvdev == NULL || nvdev->destroy) 702 return -ENODEV; 703 704 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2) 705 limit = NETVSC_MTU; 706 707 if (mtu < 68 || mtu > limit) 708 return -EINVAL; 709 710 nvdev->start_remove = true; 711 cancel_work_sync(&ndevctx->work); 712 netif_tx_disable(ndev); 713 rndis_filter_device_remove(hdev); 714 715 ndev->mtu = mtu; 716 717 ndevctx->device_ctx = hdev; 718 hv_set_drvdata(hdev, ndev); 719 device_info.ring_size = ring_size; 720 rndis_filter_device_add(hdev, &device_info); 721 netif_tx_wake_all_queues(ndev); 722 723 return 0; 724 } 725 726 727 static int netvsc_set_mac_addr(struct net_device *ndev, void *p) 728 { 729 struct net_device_context *ndevctx = netdev_priv(ndev); 730 struct hv_device *hdev = ndevctx->device_ctx; 731 struct sockaddr *addr = p; 732 char save_adr[ETH_ALEN]; 733 unsigned char save_aatype; 734 int err; 735 736 memcpy(save_adr, ndev->dev_addr, ETH_ALEN); 737 save_aatype = ndev->addr_assign_type; 738 739 err = eth_mac_addr(ndev, p); 740 if (err != 0) 741 return err; 742 743 err = rndis_filter_set_device_mac(hdev, addr->sa_data); 744 if (err != 0) { 745 /* roll back to saved MAC */ 746 memcpy(ndev->dev_addr, save_adr, ETH_ALEN); 747 ndev->addr_assign_type = save_aatype; 748 } 749 750 return err; 751 } 752 753 #ifdef CONFIG_NET_POLL_CONTROLLER 754 static void netvsc_poll_controller(struct net_device *net) 755 { 756 /* As netvsc_start_xmit() works synchronous we don't have to 757 * trigger anything here. 758 */ 759 } 760 #endif 761 762 static const struct ethtool_ops ethtool_ops = { 763 .get_drvinfo = netvsc_get_drvinfo, 764 .get_link = ethtool_op_get_link, 765 }; 766 767 static const struct net_device_ops device_ops = { 768 .ndo_open = netvsc_open, 769 .ndo_stop = netvsc_close, 770 .ndo_start_xmit = netvsc_start_xmit, 771 .ndo_set_rx_mode = netvsc_set_multicast_list, 772 .ndo_change_mtu = netvsc_change_mtu, 773 .ndo_validate_addr = eth_validate_addr, 774 .ndo_set_mac_address = netvsc_set_mac_addr, 775 .ndo_select_queue = netvsc_select_queue, 776 #ifdef CONFIG_NET_POLL_CONTROLLER 777 .ndo_poll_controller = netvsc_poll_controller, 778 #endif 779 }; 780 781 /* 782 * Send GARP packet to network peers after migrations. 783 * After Quick Migration, the network is not immediately operational in the 784 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add 785 * another netif_notify_peers() into a delayed work, otherwise GARP packet 786 * will not be sent after quick migration, and cause network disconnection. 787 * Also, we update the carrier status here. 788 */ 789 static void netvsc_link_change(struct work_struct *w) 790 { 791 struct net_device_context *ndev_ctx; 792 struct net_device *net; 793 struct netvsc_device *net_device; 794 struct rndis_device *rdev; 795 bool notify, refresh = false; 796 char *argv[] = { "/etc/init.d/network", "restart", NULL }; 797 char *envp[] = { "HOME=/", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; 798 799 rtnl_lock(); 800 801 ndev_ctx = container_of(w, struct net_device_context, dwork.work); 802 net_device = hv_get_drvdata(ndev_ctx->device_ctx); 803 rdev = net_device->extension; 804 net = net_device->ndev; 805 806 if (rdev->link_state) { 807 netif_carrier_off(net); 808 notify = false; 809 } else { 810 netif_carrier_on(net); 811 notify = true; 812 if (rdev->link_change) { 813 rdev->link_change = false; 814 refresh = true; 815 } 816 } 817 818 rtnl_unlock(); 819 820 if (refresh) 821 call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC); 822 823 if (notify) 824 netdev_notify_peers(net); 825 } 826 827 828 static int netvsc_probe(struct hv_device *dev, 829 const struct hv_vmbus_device_id *dev_id) 830 { 831 struct net_device *net = NULL; 832 struct net_device_context *net_device_ctx; 833 struct netvsc_device_info device_info; 834 struct netvsc_device *nvdev; 835 int ret; 836 837 net = alloc_etherdev_mq(sizeof(struct net_device_context), 838 num_online_cpus()); 839 if (!net) 840 return -ENOMEM; 841 842 netif_carrier_off(net); 843 844 net_device_ctx = netdev_priv(net); 845 net_device_ctx->device_ctx = dev; 846 hv_set_drvdata(dev, net); 847 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); 848 INIT_WORK(&net_device_ctx->work, do_set_multicast); 849 850 net->netdev_ops = &device_ops; 851 852 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM | 853 NETIF_F_TSO; 854 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM | 855 NETIF_F_IP_CSUM | NETIF_F_TSO; 856 857 net->ethtool_ops = ðtool_ops; 858 SET_NETDEV_DEV(net, &dev->device); 859 860 /* Notify the netvsc driver of the new device */ 861 device_info.ring_size = ring_size; 862 ret = rndis_filter_device_add(dev, &device_info); 863 if (ret != 0) { 864 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret); 865 free_netdev(net); 866 hv_set_drvdata(dev, NULL); 867 return ret; 868 } 869 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN); 870 871 nvdev = hv_get_drvdata(dev); 872 netif_set_real_num_tx_queues(net, nvdev->num_chn); 873 netif_set_real_num_rx_queues(net, nvdev->num_chn); 874 875 ret = register_netdev(net); 876 if (ret != 0) { 877 pr_err("Unable to register netdev.\n"); 878 rndis_filter_device_remove(dev); 879 free_netdev(net); 880 } else { 881 schedule_delayed_work(&net_device_ctx->dwork, 0); 882 } 883 884 return ret; 885 } 886 887 static int netvsc_remove(struct hv_device *dev) 888 { 889 struct net_device *net; 890 struct net_device_context *ndev_ctx; 891 struct netvsc_device *net_device; 892 893 net_device = hv_get_drvdata(dev); 894 net = net_device->ndev; 895 896 if (net == NULL) { 897 dev_err(&dev->device, "No net device to remove\n"); 898 return 0; 899 } 900 901 net_device->start_remove = true; 902 903 ndev_ctx = netdev_priv(net); 904 cancel_delayed_work_sync(&ndev_ctx->dwork); 905 cancel_work_sync(&ndev_ctx->work); 906 907 /* Stop outbound asap */ 908 netif_tx_disable(net); 909 910 unregister_netdev(net); 911 912 /* 913 * Call to the vsc driver to let it know that the device is being 914 * removed 915 */ 916 rndis_filter_device_remove(dev); 917 918 free_netdev(net); 919 return 0; 920 } 921 922 static const struct hv_vmbus_device_id id_table[] = { 923 /* Network guid */ 924 { HV_NIC_GUID, }, 925 { }, 926 }; 927 928 MODULE_DEVICE_TABLE(vmbus, id_table); 929 930 /* The one and only one */ 931 static struct hv_driver netvsc_drv = { 932 .name = KBUILD_MODNAME, 933 .id_table = id_table, 934 .probe = netvsc_probe, 935 .remove = netvsc_remove, 936 }; 937 938 static void __exit netvsc_drv_exit(void) 939 { 940 vmbus_driver_unregister(&netvsc_drv); 941 } 942 943 static int __init netvsc_drv_init(void) 944 { 945 if (ring_size < RING_SIZE_MIN) { 946 ring_size = RING_SIZE_MIN; 947 pr_info("Increased ring_size to %d (min allowed)\n", 948 ring_size); 949 } 950 return vmbus_driver_register(&netvsc_drv); 951 } 952 953 MODULE_LICENSE("GPL"); 954 MODULE_DESCRIPTION("Microsoft Hyper-V network driver"); 955 956 module_init(netvsc_drv_init); 957 module_exit(netvsc_drv_exit); 958