2 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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/>.
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
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>
35 #include <linux/slab.h>
37 #include <net/route.h>
39 #include <net/pkt_sched.h>
41 #include "hyperv_net.h"
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;
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)");
55 static void do_set_multicast(struct work_struct *w)
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;
62 nvdev = hv_get_drvdata(ndevctx->device_ctx);
63 if (nvdev == NULL || nvdev->ndev == NULL)
66 rdev = nvdev->extension;
70 if (nvdev->ndev->flags & IFF_PROMISC)
71 rndis_filter_set_packet_filter(rdev,
72 NDIS_PACKET_TYPE_PROMISCUOUS);
74 rndis_filter_set_packet_filter(rdev,
75 NDIS_PACKET_TYPE_BROADCAST |
76 NDIS_PACKET_TYPE_ALL_MULTICAST |
77 NDIS_PACKET_TYPE_DIRECTED);
80 static void netvsc_set_multicast_list(struct net_device *net)
82 struct net_device_context *net_device_ctx = netdev_priv(net);
84 schedule_work(&net_device_ctx->work);
87 static int netvsc_open(struct net_device *net)
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;
95 netif_carrier_off(net);
97 /* Open up the device */
98 ret = rndis_filter_open(device_obj);
100 netdev_err(net, "unable to open device (ret %d).\n", ret);
104 netif_tx_start_all_queues(net);
106 nvdev = hv_get_drvdata(device_obj);
107 rdev = nvdev->extension;
108 if (!rdev->link_state)
109 netif_carrier_on(net);
114 static int netvsc_close(struct net_device *net)
116 struct net_device_context *net_device_ctx = netdev_priv(net);
117 struct hv_device *device_obj = net_device_ctx->device_ctx;
120 netif_tx_disable(net);
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);
126 netdev_err(net, "unable to close device (ret %d).\n", ret);
131 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
134 struct rndis_packet *rndis_pkt;
135 struct rndis_per_packet_info *ppi;
137 rndis_pkt = &msg->msg.pkt;
138 rndis_pkt->data_offset += ppi_size;
140 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
141 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
143 ppi->size = ppi_size;
144 ppi->type = pkt_type;
145 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
147 rndis_pkt->per_pkt_info_len += ppi_size;
161 /* Toeplitz hash function
162 * data: network byte order
163 * return: host byte order
165 static u32 comp_hash(u8 *key, int klen, u8 *data, int dlen)
174 subk.ka = ntohl(*(u32 *)key);
176 for (i = 0; i < dlen; i++) {
177 subk.kb = key[k_next];
178 k_next = (k_next + 1) % klen;
180 for (j = 0; j < 8; j++) {
191 static bool netvsc_set_hash(u32 *hash, struct sk_buff *skb)
197 if (eth_hdr(skb)->h_proto != htons(ETH_P_IP))
202 if (iphdr->version == 4) {
203 if (iphdr->protocol == IPPROTO_TCP)
207 *hash = comp_hash(netvsc_hash_key, HASH_KEYLEN,
208 (u8 *)&iphdr->saddr, data_len);
215 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
216 void *accel_priv, select_queue_fallback_t fallback)
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);
224 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
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);
236 static void netvsc_xmit_completion(void *context)
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;
245 if (skb && (index == NETVSC_INVALID_INDEX))
246 dev_kfree_skb_any(skb);
249 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
250 struct hv_page_buffer *pb)
254 /* Deal with compund pages by ignoring unused part
257 page += (offset >> PAGE_SHIFT);
258 offset &= ~PAGE_MASK;
263 bytes = PAGE_SIZE - offset;
266 pb[j].pfn = page_to_pfn(page);
267 pb[j].offset = offset;
273 if (offset == PAGE_SIZE && len) {
283 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
284 struct hv_page_buffer *pb)
287 char *data = skb->data;
288 int frags = skb_shinfo(skb)->nr_frags;
291 /* The packet is laid out thus:
294 * 3. skb fragment data
297 slots_used += fill_pg_buf(virt_to_page(hdr),
299 len, &pb[slots_used]);
301 slots_used += fill_pg_buf(virt_to_page(data),
302 offset_in_page(data),
303 skb_headlen(skb), &pb[slots_used]);
305 for (i = 0; i < frags; i++) {
306 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
308 slots_used += fill_pg_buf(skb_frag_page(frag),
310 skb_frag_size(frag), &pb[slots_used]);
315 static int count_skb_frag_slots(struct sk_buff *skb)
317 int i, frags = skb_shinfo(skb)->nr_frags;
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;
325 /* Skip unused frames from start of page */
326 offset &= ~PAGE_MASK;
327 pages += PFN_UP(offset + size);
332 static int netvsc_get_slots(struct sk_buff *skb)
334 char *data = skb->data;
335 unsigned int offset = offset_in_page(data);
336 unsigned int len = skb_headlen(skb);
340 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
341 frag_slots = count_skb_frag_slots(skb);
342 return slots + frag_slots;
345 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
347 u32 ret_val = TRANSPORT_INFO_NOT_IP;
349 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
350 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
354 *trans_off = skb_transport_offset(skb);
356 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
357 struct iphdr *iphdr = ip_hdr(skb);
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;
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;
374 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
376 struct net_device_context *net_device_ctx = netdev_priv(net);
377 struct hv_netvsc_packet *packet;
379 unsigned int num_data_pgs;
380 struct rndis_message *rndis_msg;
381 struct rndis_packet *rndis_pkt;
384 struct rndis_per_packet_info *ppi;
385 struct ndis_tcp_ip_checksum_info *csum_info;
386 struct ndis_tcp_lso_info *lso_info;
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.
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);
400 net->stats.tx_dropped++;
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);
411 /* out of memory, drop packet */
412 netdev_err(net, "unable to allocate hv_netvsc_packet\n");
415 net->stats.tx_dropped++;
419 packet->vlan_tci = skb->vlan_tci;
421 packet->q_idx = skb_get_queue_mapping(skb);
423 packet->is_data_pkt = true;
424 packet->total_data_buflen = skb->len;
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)));
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;
435 isvlan = packet->vlan_tci & VLAN_TAG_PRESENT;
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);
446 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
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,
453 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
457 struct ndis_pkt_8021q_info *vlan;
459 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
460 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
462 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
464 vlan->vlanid = packet->vlan_tci & VLAN_VID_MASK;
465 vlan->pri = (packet->vlan_tci & VLAN_PRIO_MASK) >>
469 net_trans_info = get_net_transport_info(skb, &hdr_offset);
470 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
474 * Setup the sendside checksum offload only if this is not a
480 if ((skb->ip_summed == CHECKSUM_NONE) ||
481 (skb->ip_summed == CHECKSUM_UNNECESSARY))
484 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
485 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
486 TCPIP_CHKSUM_PKTINFO);
488 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
491 if (net_trans_info & (INFO_IPV4 << 16))
492 csum_info->transmit.is_ipv4 = 1;
494 csum_info->transmit.is_ipv6 = 1;
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.
509 ret = skb_cow_head(skb, 0);
514 udp_len = ntohs(uh->len);
516 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
518 udp_len, IPPROTO_UDP,
519 csum_partial(uh, udp_len, 0));
521 uh->check = CSUM_MANGLED_0;
523 csum_info->transmit.udp_checksum = 0;
528 rndis_msg_size += NDIS_LSO_PPI_SIZE;
529 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
530 TCP_LARGESEND_PKTINFO);
532 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
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);
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);
552 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
553 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
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]);
561 ret = netvsc_send(net_device_ctx->device_ctx, packet);
565 net->stats.tx_bytes += skb->len;
566 net->stats.tx_packets++;
569 if (ret != -EAGAIN) {
570 dev_kfree_skb_any(skb);
571 net->stats.tx_dropped++;
575 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
579 * netvsc_linkstatus_callback - Link up/down notification
581 void netvsc_linkstatus_callback(struct hv_device *device_obj,
584 struct net_device *net;
585 struct net_device_context *ndev_ctx;
586 struct netvsc_device *net_device;
587 struct rndis_device *rdev;
589 net_device = hv_get_drvdata(device_obj);
590 rdev = net_device->extension;
592 rdev->link_state = status != 1;
594 net = net_device->ndev;
596 if (!net || net->reg_state != NETREG_REGISTERED)
599 ndev_ctx = netdev_priv(net);
601 schedule_delayed_work(&ndev_ctx->dwork, 0);
602 schedule_delayed_work(&ndev_ctx->dwork, msecs_to_jiffies(20));
604 schedule_delayed_work(&ndev_ctx->dwork, 0);
609 * netvsc_recv_callback - Callback when we receive a packet from the
610 * "wire" on the specified device.
612 int netvsc_recv_callback(struct hv_device *device_obj,
613 struct hv_netvsc_packet *packet,
614 struct ndis_tcp_ip_checksum_info *csum_info)
616 struct net_device *net;
619 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
620 if (!net || net->reg_state != NETREG_REGISTERED) {
621 packet->status = NVSP_STAT_FAIL;
625 /* Allocate a skb - TODO direct I/O to pages? */
626 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
627 if (unlikely(!skb)) {
628 ++net->stats.rx_dropped;
629 packet->status = NVSP_STAT_FAIL;
634 * Copy to skb. This copy is needed here since the memory pointed by
635 * hv_netvsc_packet cannot be deallocated
637 memcpy(skb_put(skb, packet->total_data_buflen), packet->data,
638 packet->total_data_buflen);
640 skb->protocol = eth_type_trans(skb, net);
642 /* We only look at the IP checksum here.
643 * Should we be dropping the packet if checksum
644 * failed? How do we deal with other checksums - TCP/UDP?
646 if (csum_info->receive.ip_checksum_succeeded)
647 skb->ip_summed = CHECKSUM_UNNECESSARY;
649 skb->ip_summed = CHECKSUM_NONE;
652 if (packet->vlan_tci & VLAN_TAG_PRESENT)
653 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
656 skb_record_rx_queue(skb, packet->channel->
657 offermsg.offer.sub_channel_index);
659 net->stats.rx_packets++;
660 net->stats.rx_bytes += packet->total_data_buflen;
663 * Pass the skb back up. Network stack will deallocate the skb when it
672 static void netvsc_get_drvinfo(struct net_device *net,
673 struct ethtool_drvinfo *info)
675 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
676 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
679 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
681 struct net_device_context *ndevctx = netdev_priv(ndev);
682 struct hv_device *hdev = ndevctx->device_ctx;
683 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
684 struct netvsc_device_info device_info;
685 int limit = ETH_DATA_LEN;
687 if (nvdev == NULL || nvdev->destroy)
690 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
693 if (mtu < 68 || mtu > limit)
696 nvdev->start_remove = true;
697 cancel_work_sync(&ndevctx->work);
698 netif_tx_disable(ndev);
699 rndis_filter_device_remove(hdev);
703 ndevctx->device_ctx = hdev;
704 hv_set_drvdata(hdev, ndev);
705 device_info.ring_size = ring_size;
706 rndis_filter_device_add(hdev, &device_info);
707 netif_tx_wake_all_queues(ndev);
713 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
715 struct net_device_context *ndevctx = netdev_priv(ndev);
716 struct hv_device *hdev = ndevctx->device_ctx;
717 struct sockaddr *addr = p;
718 char save_adr[ETH_ALEN];
719 unsigned char save_aatype;
722 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
723 save_aatype = ndev->addr_assign_type;
725 err = eth_mac_addr(ndev, p);
729 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
731 /* roll back to saved MAC */
732 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
733 ndev->addr_assign_type = save_aatype;
740 static const struct ethtool_ops ethtool_ops = {
741 .get_drvinfo = netvsc_get_drvinfo,
742 .get_link = ethtool_op_get_link,
745 static const struct net_device_ops device_ops = {
746 .ndo_open = netvsc_open,
747 .ndo_stop = netvsc_close,
748 .ndo_start_xmit = netvsc_start_xmit,
749 .ndo_set_rx_mode = netvsc_set_multicast_list,
750 .ndo_change_mtu = netvsc_change_mtu,
751 .ndo_validate_addr = eth_validate_addr,
752 .ndo_set_mac_address = netvsc_set_mac_addr,
753 .ndo_select_queue = netvsc_select_queue,
757 * Send GARP packet to network peers after migrations.
758 * After Quick Migration, the network is not immediately operational in the
759 * current context when receiving RNDIS_STATUS_MEDIA_CONNECT event. So, add
760 * another netif_notify_peers() into a delayed work, otherwise GARP packet
761 * will not be sent after quick migration, and cause network disconnection.
762 * Also, we update the carrier status here.
764 static void netvsc_link_change(struct work_struct *w)
766 struct net_device_context *ndev_ctx;
767 struct net_device *net;
768 struct netvsc_device *net_device;
769 struct rndis_device *rdev;
774 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
775 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
776 rdev = net_device->extension;
777 net = net_device->ndev;
779 if (rdev->link_state) {
780 netif_carrier_off(net);
783 netif_carrier_on(net);
790 netdev_notify_peers(net);
794 static int netvsc_probe(struct hv_device *dev,
795 const struct hv_vmbus_device_id *dev_id)
797 struct net_device *net = NULL;
798 struct net_device_context *net_device_ctx;
799 struct netvsc_device_info device_info;
800 struct netvsc_device *nvdev;
803 net = alloc_etherdev_mq(sizeof(struct net_device_context),
808 netif_carrier_off(net);
810 net_device_ctx = netdev_priv(net);
811 net_device_ctx->device_ctx = dev;
812 hv_set_drvdata(dev, net);
813 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
814 INIT_WORK(&net_device_ctx->work, do_set_multicast);
816 net->netdev_ops = &device_ops;
818 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
820 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
821 NETIF_F_IP_CSUM | NETIF_F_TSO;
823 net->ethtool_ops = ðtool_ops;
824 SET_NETDEV_DEV(net, &dev->device);
826 /* Notify the netvsc driver of the new device */
827 device_info.ring_size = ring_size;
828 ret = rndis_filter_device_add(dev, &device_info);
830 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
832 hv_set_drvdata(dev, NULL);
835 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
837 nvdev = hv_get_drvdata(dev);
838 netif_set_real_num_tx_queues(net, nvdev->num_chn);
839 netif_set_real_num_rx_queues(net, nvdev->num_chn);
841 ret = register_netdev(net);
843 pr_err("Unable to register netdev.\n");
844 rndis_filter_device_remove(dev);
847 schedule_delayed_work(&net_device_ctx->dwork, 0);
853 static int netvsc_remove(struct hv_device *dev)
855 struct net_device *net;
856 struct net_device_context *ndev_ctx;
857 struct netvsc_device *net_device;
859 net_device = hv_get_drvdata(dev);
860 net = net_device->ndev;
863 dev_err(&dev->device, "No net device to remove\n");
867 net_device->start_remove = true;
869 ndev_ctx = netdev_priv(net);
870 cancel_delayed_work_sync(&ndev_ctx->dwork);
871 cancel_work_sync(&ndev_ctx->work);
873 /* Stop outbound asap */
874 netif_tx_disable(net);
876 unregister_netdev(net);
879 * Call to the vsc driver to let it know that the device is being
882 rndis_filter_device_remove(dev);
888 static const struct hv_vmbus_device_id id_table[] = {
894 MODULE_DEVICE_TABLE(vmbus, id_table);
896 /* The one and only one */
897 static struct hv_driver netvsc_drv = {
898 .name = KBUILD_MODNAME,
899 .id_table = id_table,
900 .probe = netvsc_probe,
901 .remove = netvsc_remove,
904 static void __exit netvsc_drv_exit(void)
906 vmbus_driver_unregister(&netvsc_drv);
909 static int __init netvsc_drv_init(void)
911 if (ring_size < RING_SIZE_MIN) {
912 ring_size = RING_SIZE_MIN;
913 pr_info("Increased ring_size to %d (min allowed)\n",
916 return vmbus_driver_register(&netvsc_drv);
919 MODULE_LICENSE("GPL");
920 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
922 module_init(netvsc_drv_init);
923 module_exit(netvsc_drv_exit);