1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2009, Microsoft Corporation.
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/init.h>
12 #include <linux/atomic.h>
13 #include <linux/module.h>
14 #include <linux/highmem.h>
15 #include <linux/device.h>
17 #include <linux/delay.h>
18 #include <linux/netdevice.h>
19 #include <linux/inetdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/pci.h>
22 #include <linux/skbuff.h>
23 #include <linux/if_vlan.h>
25 #include <linux/slab.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/netpoll.h>
30 #include <net/route.h>
32 #include <net/pkt_sched.h>
33 #include <net/checksum.h>
34 #include <net/ip6_checksum.h>
36 #include "hyperv_net.h"
38 #define RING_SIZE_MIN 64
39 #define RETRY_US_LO 5000
40 #define RETRY_US_HI 10000
41 #define RETRY_MAX 2000 /* >10 sec */
43 #define LINKCHANGE_INT (2 * HZ)
44 #define VF_TAKEOVER_INT (HZ / 10)
46 static unsigned int ring_size __ro_after_init = 128;
47 module_param(ring_size, uint, 0444);
48 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
49 unsigned int netvsc_ring_bytes __ro_after_init;
51 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
52 NETIF_MSG_LINK | NETIF_MSG_IFUP |
53 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
56 static int debug = -1;
57 module_param(debug, int, 0444);
58 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
60 static LIST_HEAD(netvsc_dev_list);
62 static void netvsc_change_rx_flags(struct net_device *net, int change)
64 struct net_device_context *ndev_ctx = netdev_priv(net);
65 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
71 if (change & IFF_PROMISC) {
72 inc = (net->flags & IFF_PROMISC) ? 1 : -1;
73 dev_set_promiscuity(vf_netdev, inc);
76 if (change & IFF_ALLMULTI) {
77 inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;
78 dev_set_allmulti(vf_netdev, inc);
82 static void netvsc_set_rx_mode(struct net_device *net)
84 struct net_device_context *ndev_ctx = netdev_priv(net);
85 struct net_device *vf_netdev;
86 struct netvsc_device *nvdev;
89 vf_netdev = rcu_dereference(ndev_ctx->vf_netdev);
91 dev_uc_sync(vf_netdev, net);
92 dev_mc_sync(vf_netdev, net);
95 nvdev = rcu_dereference(ndev_ctx->nvdev);
97 rndis_filter_update(nvdev);
101 static void netvsc_tx_enable(struct netvsc_device *nvscdev,
102 struct net_device *ndev)
104 nvscdev->tx_disable = false;
105 virt_wmb(); /* ensure queue wake up mechanism is on */
107 netif_tx_wake_all_queues(ndev);
110 static int netvsc_open(struct net_device *net)
112 struct net_device_context *ndev_ctx = netdev_priv(net);
113 struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
114 struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
115 struct rndis_device *rdev;
118 netif_carrier_off(net);
120 /* Open up the device */
121 ret = rndis_filter_open(nvdev);
123 netdev_err(net, "unable to open device (ret %d).\n", ret);
127 rdev = nvdev->extension;
128 if (!rdev->link_state) {
129 netif_carrier_on(net);
130 netvsc_tx_enable(nvdev, net);
134 /* Setting synthetic device up transparently sets
135 * slave as up. If open fails, then slave will be
136 * still be offline (and not used).
138 ret = dev_open(vf_netdev, NULL);
141 "unable to open slave: %s: %d\n",
142 vf_netdev->name, ret);
147 static int netvsc_wait_until_empty(struct netvsc_device *nvdev)
149 unsigned int retry = 0;
152 /* Ensure pending bytes in ring are read */
156 for (i = 0; i < nvdev->num_chn; i++) {
157 struct vmbus_channel *chn
158 = nvdev->chan_table[i].channel;
163 /* make sure receive not running now */
164 napi_synchronize(&nvdev->chan_table[i].napi);
166 aread = hv_get_bytes_to_read(&chn->inbound);
170 aread = hv_get_bytes_to_read(&chn->outbound);
178 if (++retry > RETRY_MAX)
181 usleep_range(RETRY_US_LO, RETRY_US_HI);
185 static void netvsc_tx_disable(struct netvsc_device *nvscdev,
186 struct net_device *ndev)
189 nvscdev->tx_disable = true;
190 virt_wmb(); /* ensure txq will not wake up after stop */
193 netif_tx_disable(ndev);
196 static int netvsc_close(struct net_device *net)
198 struct net_device_context *net_device_ctx = netdev_priv(net);
199 struct net_device *vf_netdev
200 = rtnl_dereference(net_device_ctx->vf_netdev);
201 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
204 netvsc_tx_disable(nvdev, net);
206 /* No need to close rndis filter if it is removed already */
210 ret = rndis_filter_close(nvdev);
212 netdev_err(net, "unable to close device (ret %d).\n", ret);
216 ret = netvsc_wait_until_empty(nvdev);
218 netdev_err(net, "Ring buffer not empty after closing rndis\n");
221 dev_close(vf_netdev);
226 static inline void *init_ppi_data(struct rndis_message *msg,
227 u32 ppi_size, u32 pkt_type)
229 struct rndis_packet *rndis_pkt = &msg->msg.pkt;
230 struct rndis_per_packet_info *ppi;
232 rndis_pkt->data_offset += ppi_size;
233 ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset
234 + rndis_pkt->per_pkt_info_len;
236 ppi->size = ppi_size;
237 ppi->type = pkt_type;
239 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
241 rndis_pkt->per_pkt_info_len += ppi_size;
246 /* Azure hosts don't support non-TCP port numbers in hashing for fragmented
247 * packets. We can use ethtool to change UDP hash level when necessary.
249 static inline u32 netvsc_get_hash(
251 const struct net_device_context *ndc)
253 struct flow_keys flow;
254 u32 hash, pkt_proto = 0;
255 static u32 hashrnd __read_mostly;
257 net_get_random_once(&hashrnd, sizeof(hashrnd));
259 if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
262 switch (flow.basic.ip_proto) {
264 if (flow.basic.n_proto == htons(ETH_P_IP))
265 pkt_proto = HV_TCP4_L4HASH;
266 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
267 pkt_proto = HV_TCP6_L4HASH;
272 if (flow.basic.n_proto == htons(ETH_P_IP))
273 pkt_proto = HV_UDP4_L4HASH;
274 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
275 pkt_proto = HV_UDP6_L4HASH;
280 if (pkt_proto & ndc->l4_hash) {
281 return skb_get_hash(skb);
283 if (flow.basic.n_proto == htons(ETH_P_IP))
284 hash = jhash2((u32 *)&flow.addrs.v4addrs, 2, hashrnd);
285 else if (flow.basic.n_proto == htons(ETH_P_IPV6))
286 hash = jhash2((u32 *)&flow.addrs.v6addrs, 8, hashrnd);
290 __skb_set_sw_hash(skb, hash, false);
296 static inline int netvsc_get_tx_queue(struct net_device *ndev,
297 struct sk_buff *skb, int old_idx)
299 const struct net_device_context *ndc = netdev_priv(ndev);
300 struct sock *sk = skb->sk;
303 q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
304 (VRSS_SEND_TAB_SIZE - 1)];
306 /* If queue index changed record the new value */
307 if (q_idx != old_idx &&
308 sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
309 sk_tx_queue_set(sk, q_idx);
315 * Select queue for transmit.
317 * If a valid queue has already been assigned, then use that.
318 * Otherwise compute tx queue based on hash and the send table.
320 * This is basically similar to default (netdev_pick_tx) with the added step
321 * of using the host send_table when no other queue has been assigned.
323 * TODO support XPS - but get_xps_queue not exported
325 static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
327 int q_idx = sk_tx_queue_get(skb->sk);
329 if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
330 /* If forwarding a packet, we use the recorded queue when
331 * available for better cache locality.
333 if (skb_rx_queue_recorded(skb))
334 q_idx = skb_get_rx_queue(skb);
336 q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
342 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
343 struct net_device *sb_dev)
345 struct net_device_context *ndc = netdev_priv(ndev);
346 struct net_device *vf_netdev;
350 vf_netdev = rcu_dereference(ndc->vf_netdev);
352 const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
354 if (vf_ops->ndo_select_queue)
355 txq = vf_ops->ndo_select_queue(vf_netdev, skb, sb_dev);
357 txq = netdev_pick_tx(vf_netdev, skb, NULL);
359 /* Record the queue selected by VF so that it can be
360 * used for common case where VF has more queues than
361 * the synthetic device.
363 qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
365 txq = netvsc_pick_tx(ndev, skb);
369 while (unlikely(txq >= ndev->real_num_tx_queues))
370 txq -= ndev->real_num_tx_queues;
375 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
376 struct hv_page_buffer *pb)
380 /* Deal with compound pages by ignoring unused part
383 page += (offset >> PAGE_SHIFT);
384 offset &= ~PAGE_MASK;
389 bytes = PAGE_SIZE - offset;
392 pb[j].pfn = page_to_pfn(page);
393 pb[j].offset = offset;
399 if (offset == PAGE_SIZE && len) {
409 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
410 struct hv_netvsc_packet *packet,
411 struct hv_page_buffer *pb)
414 char *data = skb->data;
415 int frags = skb_shinfo(skb)->nr_frags;
418 /* The packet is laid out thus:
419 * 1. hdr: RNDIS header and PPI
421 * 3. skb fragment data
423 slots_used += fill_pg_buf(virt_to_page(hdr),
425 len, &pb[slots_used]);
427 packet->rmsg_size = len;
428 packet->rmsg_pgcnt = slots_used;
430 slots_used += fill_pg_buf(virt_to_page(data),
431 offset_in_page(data),
432 skb_headlen(skb), &pb[slots_used]);
434 for (i = 0; i < frags; i++) {
435 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
437 slots_used += fill_pg_buf(skb_frag_page(frag),
439 skb_frag_size(frag), &pb[slots_used]);
444 static int count_skb_frag_slots(struct sk_buff *skb)
446 int i, frags = skb_shinfo(skb)->nr_frags;
449 for (i = 0; i < frags; i++) {
450 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
451 unsigned long size = skb_frag_size(frag);
452 unsigned long offset = skb_frag_off(frag);
454 /* Skip unused frames from start of page */
455 offset &= ~PAGE_MASK;
456 pages += PFN_UP(offset + size);
461 static int netvsc_get_slots(struct sk_buff *skb)
463 char *data = skb->data;
464 unsigned int offset = offset_in_page(data);
465 unsigned int len = skb_headlen(skb);
469 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
470 frag_slots = count_skb_frag_slots(skb);
471 return slots + frag_slots;
474 static u32 net_checksum_info(struct sk_buff *skb)
476 if (skb->protocol == htons(ETH_P_IP)) {
477 struct iphdr *ip = ip_hdr(skb);
479 if (ip->protocol == IPPROTO_TCP)
480 return TRANSPORT_INFO_IPV4_TCP;
481 else if (ip->protocol == IPPROTO_UDP)
482 return TRANSPORT_INFO_IPV4_UDP;
484 struct ipv6hdr *ip6 = ipv6_hdr(skb);
486 if (ip6->nexthdr == IPPROTO_TCP)
487 return TRANSPORT_INFO_IPV6_TCP;
488 else if (ip6->nexthdr == IPPROTO_UDP)
489 return TRANSPORT_INFO_IPV6_UDP;
492 return TRANSPORT_INFO_NOT_IP;
495 /* Send skb on the slave VF device. */
496 static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
499 struct net_device_context *ndev_ctx = netdev_priv(net);
500 unsigned int len = skb->len;
503 skb->dev = vf_netdev;
504 skb->queue_mapping = qdisc_skb_cb(skb)->slave_dev_queue_mapping;
506 rc = dev_queue_xmit(skb);
507 if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
508 struct netvsc_vf_pcpu_stats *pcpu_stats
509 = this_cpu_ptr(ndev_ctx->vf_stats);
511 u64_stats_update_begin(&pcpu_stats->syncp);
512 pcpu_stats->tx_packets++;
513 pcpu_stats->tx_bytes += len;
514 u64_stats_update_end(&pcpu_stats->syncp);
516 this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
522 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
524 struct net_device_context *net_device_ctx = netdev_priv(net);
525 struct hv_netvsc_packet *packet = NULL;
527 unsigned int num_data_pgs;
528 struct rndis_message *rndis_msg;
529 struct net_device *vf_netdev;
532 struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
534 /* if VF is present and up then redirect packets
535 * already called with rcu_read_lock_bh
537 vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
538 if (vf_netdev && netif_running(vf_netdev) &&
539 !netpoll_tx_running(net))
540 return netvsc_vf_xmit(net, vf_netdev, skb);
542 /* We will atmost need two pages to describe the rndis
543 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
544 * of pages in a single packet. If skb is scattered around
545 * more pages we try linearizing it.
548 num_data_pgs = netvsc_get_slots(skb) + 2;
550 if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
551 ++net_device_ctx->eth_stats.tx_scattered;
553 if (skb_linearize(skb))
556 num_data_pgs = netvsc_get_slots(skb) + 2;
557 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
558 ++net_device_ctx->eth_stats.tx_too_big;
564 * Place the rndis header in the skb head room and
565 * the skb->cb will be used for hv_netvsc_packet
568 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
572 /* Use the skb control buffer for building up the packet */
573 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
574 sizeof_field(struct sk_buff, cb));
575 packet = (struct hv_netvsc_packet *)skb->cb;
577 packet->q_idx = skb_get_queue_mapping(skb);
579 packet->total_data_buflen = skb->len;
580 packet->total_bytes = skb->len;
581 packet->total_packets = 1;
583 rndis_msg = (struct rndis_message *)skb->head;
585 /* Add the rndis header */
586 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
587 rndis_msg->msg_len = packet->total_data_buflen;
589 rndis_msg->msg.pkt = (struct rndis_packet) {
590 .data_offset = sizeof(struct rndis_packet),
591 .data_len = packet->total_data_buflen,
592 .per_pkt_info_offset = sizeof(struct rndis_packet),
595 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
597 hash = skb_get_hash_raw(skb);
598 if (hash != 0 && net->real_num_tx_queues > 1) {
601 rndis_msg_size += NDIS_HASH_PPI_SIZE;
602 hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
607 if (skb_vlan_tag_present(skb)) {
608 struct ndis_pkt_8021q_info *vlan;
610 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
611 vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
615 vlan->vlanid = skb_vlan_tag_get_id(skb);
616 vlan->cfi = skb_vlan_tag_get_cfi(skb);
617 vlan->pri = skb_vlan_tag_get_prio(skb);
620 if (skb_is_gso(skb)) {
621 struct ndis_tcp_lso_info *lso_info;
623 rndis_msg_size += NDIS_LSO_PPI_SIZE;
624 lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
625 TCP_LARGESEND_PKTINFO);
628 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
629 if (skb->protocol == htons(ETH_P_IP)) {
630 lso_info->lso_v2_transmit.ip_version =
631 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
632 ip_hdr(skb)->tot_len = 0;
633 ip_hdr(skb)->check = 0;
634 tcp_hdr(skb)->check =
635 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
636 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
638 lso_info->lso_v2_transmit.ip_version =
639 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
640 ipv6_hdr(skb)->payload_len = 0;
641 tcp_hdr(skb)->check =
642 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
643 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
645 lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
646 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
647 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
648 if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
649 struct ndis_tcp_ip_checksum_info *csum_info;
651 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
652 csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
653 TCPIP_CHKSUM_PKTINFO);
655 csum_info->value = 0;
656 csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
658 if (skb->protocol == htons(ETH_P_IP)) {
659 csum_info->transmit.is_ipv4 = 1;
661 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
662 csum_info->transmit.tcp_checksum = 1;
664 csum_info->transmit.udp_checksum = 1;
666 csum_info->transmit.is_ipv6 = 1;
668 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
669 csum_info->transmit.tcp_checksum = 1;
671 csum_info->transmit.udp_checksum = 1;
674 /* Can't do offload of this type of checksum */
675 if (skb_checksum_help(skb))
680 /* Start filling in the page buffers with the rndis hdr */
681 rndis_msg->msg_len += rndis_msg_size;
682 packet->total_data_buflen = rndis_msg->msg_len;
683 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
686 /* timestamp packet in software */
687 skb_tx_timestamp(skb);
689 ret = netvsc_send(net, packet, rndis_msg, pb, skb);
690 if (likely(ret == 0))
693 if (ret == -EAGAIN) {
694 ++net_device_ctx->eth_stats.tx_busy;
695 return NETDEV_TX_BUSY;
699 ++net_device_ctx->eth_stats.tx_no_space;
702 dev_kfree_skb_any(skb);
703 net->stats.tx_dropped++;
708 ++net_device_ctx->eth_stats.tx_no_memory;
713 * netvsc_linkstatus_callback - Link up/down notification
715 void netvsc_linkstatus_callback(struct net_device *net,
716 struct rndis_message *resp)
718 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
719 struct net_device_context *ndev_ctx = netdev_priv(net);
720 struct netvsc_reconfig *event;
723 /* Update the physical link speed when changing to another vSwitch */
724 if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
727 speed = *(u32 *)((void *)indicate
728 + indicate->status_buf_offset) / 10000;
729 ndev_ctx->speed = speed;
733 /* Handle these link change statuses below */
734 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
735 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
736 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
739 if (net->reg_state != NETREG_REGISTERED)
742 event = kzalloc(sizeof(*event), GFP_ATOMIC);
745 event->event = indicate->status;
747 spin_lock_irqsave(&ndev_ctx->lock, flags);
748 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
749 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
751 schedule_delayed_work(&ndev_ctx->dwork, 0);
754 static void netvsc_comp_ipcsum(struct sk_buff *skb)
756 struct iphdr *iph = (struct iphdr *)skb->data;
759 iph->check = ip_fast_csum(iph, iph->ihl);
762 static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
763 struct netvsc_channel *nvchan)
765 struct napi_struct *napi = &nvchan->napi;
766 const struct ndis_pkt_8021q_info *vlan = nvchan->rsc.vlan;
767 const struct ndis_tcp_ip_checksum_info *csum_info =
768 nvchan->rsc.csum_info;
769 const u32 *hash_info = nvchan->rsc.hash_info;
773 skb = napi_alloc_skb(napi, nvchan->rsc.pktlen);
778 * Copy to skb. This copy is needed here since the memory pointed by
779 * hv_netvsc_packet cannot be deallocated
781 for (i = 0; i < nvchan->rsc.cnt; i++)
782 skb_put_data(skb, nvchan->rsc.data[i], nvchan->rsc.len[i]);
784 skb->protocol = eth_type_trans(skb, net);
786 /* skb is already created with CHECKSUM_NONE */
787 skb_checksum_none_assert(skb);
789 /* Incoming packets may have IP header checksum verified by the host.
790 * They may not have IP header checksum computed after coalescing.
791 * We compute it here if the flags are set, because on Linux, the IP
792 * checksum is always checked.
794 if (csum_info && csum_info->receive.ip_checksum_value_invalid &&
795 csum_info->receive.ip_checksum_succeeded &&
796 skb->protocol == htons(ETH_P_IP))
797 netvsc_comp_ipcsum(skb);
799 /* Do L4 checksum offload if enabled and present. */
800 if (csum_info && (net->features & NETIF_F_RXCSUM)) {
801 if (csum_info->receive.tcp_checksum_succeeded ||
802 csum_info->receive.udp_checksum_succeeded)
803 skb->ip_summed = CHECKSUM_UNNECESSARY;
806 if (hash_info && (net->features & NETIF_F_RXHASH))
807 skb_set_hash(skb, *hash_info, PKT_HASH_TYPE_L4);
810 u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |
811 (vlan->cfi ? VLAN_CFI_MASK : 0);
813 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
821 * netvsc_recv_callback - Callback when we receive a packet from the
822 * "wire" on the specified device.
824 int netvsc_recv_callback(struct net_device *net,
825 struct netvsc_device *net_device,
826 struct netvsc_channel *nvchan)
828 struct net_device_context *net_device_ctx = netdev_priv(net);
829 struct vmbus_channel *channel = nvchan->channel;
830 u16 q_idx = channel->offermsg.offer.sub_channel_index;
832 struct netvsc_stats *rx_stats;
834 if (net->reg_state != NETREG_REGISTERED)
835 return NVSP_STAT_FAIL;
837 /* Allocate a skb - TODO direct I/O to pages? */
838 skb = netvsc_alloc_recv_skb(net, nvchan);
840 if (unlikely(!skb)) {
841 ++net_device_ctx->eth_stats.rx_no_memory;
842 return NVSP_STAT_FAIL;
845 skb_record_rx_queue(skb, q_idx);
848 * Even if injecting the packet, record the statistics
849 * on the synthetic device because modifying the VF device
850 * statistics will not work correctly.
852 rx_stats = &nvchan->rx_stats;
853 u64_stats_update_begin(&rx_stats->syncp);
855 rx_stats->bytes += nvchan->rsc.pktlen;
857 if (skb->pkt_type == PACKET_BROADCAST)
858 ++rx_stats->broadcast;
859 else if (skb->pkt_type == PACKET_MULTICAST)
860 ++rx_stats->multicast;
861 u64_stats_update_end(&rx_stats->syncp);
863 napi_gro_receive(&nvchan->napi, skb);
864 return NVSP_STAT_SUCCESS;
867 static void netvsc_get_drvinfo(struct net_device *net,
868 struct ethtool_drvinfo *info)
870 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
871 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
874 static void netvsc_get_channels(struct net_device *net,
875 struct ethtool_channels *channel)
877 struct net_device_context *net_device_ctx = netdev_priv(net);
878 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
881 channel->max_combined = nvdev->max_chn;
882 channel->combined_count = nvdev->num_chn;
886 /* Alloc struct netvsc_device_info, and initialize it from either existing
887 * struct netvsc_device, or from default values.
889 static struct netvsc_device_info *netvsc_devinfo_get
890 (struct netvsc_device *nvdev)
892 struct netvsc_device_info *dev_info;
894 dev_info = kzalloc(sizeof(*dev_info), GFP_ATOMIC);
900 dev_info->num_chn = nvdev->num_chn;
901 dev_info->send_sections = nvdev->send_section_cnt;
902 dev_info->send_section_size = nvdev->send_section_size;
903 dev_info->recv_sections = nvdev->recv_section_cnt;
904 dev_info->recv_section_size = nvdev->recv_section_size;
906 memcpy(dev_info->rss_key, nvdev->extension->rss_key,
909 dev_info->num_chn = VRSS_CHANNEL_DEFAULT;
910 dev_info->send_sections = NETVSC_DEFAULT_TX;
911 dev_info->send_section_size = NETVSC_SEND_SECTION_SIZE;
912 dev_info->recv_sections = NETVSC_DEFAULT_RX;
913 dev_info->recv_section_size = NETVSC_RECV_SECTION_SIZE;
919 static int netvsc_detach(struct net_device *ndev,
920 struct netvsc_device *nvdev)
922 struct net_device_context *ndev_ctx = netdev_priv(ndev);
923 struct hv_device *hdev = ndev_ctx->device_ctx;
926 /* Don't try continuing to try and setup sub channels */
927 if (cancel_work_sync(&nvdev->subchan_work))
930 /* If device was up (receiving) then shutdown */
931 if (netif_running(ndev)) {
932 netvsc_tx_disable(nvdev, ndev);
934 ret = rndis_filter_close(nvdev);
937 "unable to close device (ret %d).\n", ret);
941 ret = netvsc_wait_until_empty(nvdev);
944 "Ring buffer not empty after closing rndis\n");
949 netif_device_detach(ndev);
951 rndis_filter_device_remove(hdev, nvdev);
956 static int netvsc_attach(struct net_device *ndev,
957 struct netvsc_device_info *dev_info)
959 struct net_device_context *ndev_ctx = netdev_priv(ndev);
960 struct hv_device *hdev = ndev_ctx->device_ctx;
961 struct netvsc_device *nvdev;
962 struct rndis_device *rdev;
965 nvdev = rndis_filter_device_add(hdev, dev_info);
967 return PTR_ERR(nvdev);
969 if (nvdev->num_chn > 1) {
970 ret = rndis_set_subchannel(ndev, nvdev, dev_info);
972 /* if unavailable, just proceed with one queue */
979 /* In any case device is now ready */
980 netif_device_attach(ndev);
982 /* Note: enable and attach happen when sub-channels setup */
983 netif_carrier_off(ndev);
985 if (netif_running(ndev)) {
986 ret = rndis_filter_open(nvdev);
990 rdev = nvdev->extension;
991 if (!rdev->link_state)
992 netif_carrier_on(ndev);
998 netif_device_detach(ndev);
1000 rndis_filter_device_remove(hdev, nvdev);
1005 static int netvsc_set_channels(struct net_device *net,
1006 struct ethtool_channels *channels)
1008 struct net_device_context *net_device_ctx = netdev_priv(net);
1009 struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
1010 unsigned int orig, count = channels->combined_count;
1011 struct netvsc_device_info *device_info;
1014 /* We do not support separate count for rx, tx, or other */
1016 channels->rx_count || channels->tx_count || channels->other_count)
1019 if (!nvdev || nvdev->destroy)
1022 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1025 if (count > nvdev->max_chn)
1028 orig = nvdev->num_chn;
1030 device_info = netvsc_devinfo_get(nvdev);
1035 device_info->num_chn = count;
1037 ret = netvsc_detach(net, nvdev);
1041 ret = netvsc_attach(net, device_info);
1043 device_info->num_chn = orig;
1044 if (netvsc_attach(net, device_info))
1045 netdev_err(net, "restoring channel setting failed\n");
1054 netvsc_validate_ethtool_ss_cmd(const struct ethtool_link_ksettings *cmd)
1056 struct ethtool_link_ksettings diff1 = *cmd;
1057 struct ethtool_link_ksettings diff2 = {};
1059 diff1.base.speed = 0;
1060 diff1.base.duplex = 0;
1061 /* advertising and cmd are usually set */
1062 ethtool_link_ksettings_zero_link_mode(&diff1, advertising);
1064 /* We set port to PORT_OTHER */
1065 diff2.base.port = PORT_OTHER;
1067 return !memcmp(&diff1, &diff2, sizeof(diff1));
1070 static void netvsc_init_settings(struct net_device *dev)
1072 struct net_device_context *ndc = netdev_priv(dev);
1074 ndc->l4_hash = HV_DEFAULT_L4HASH;
1076 ndc->speed = SPEED_UNKNOWN;
1077 ndc->duplex = DUPLEX_FULL;
1079 dev->features = NETIF_F_LRO;
1082 static int netvsc_get_link_ksettings(struct net_device *dev,
1083 struct ethtool_link_ksettings *cmd)
1085 struct net_device_context *ndc = netdev_priv(dev);
1087 cmd->base.speed = ndc->speed;
1088 cmd->base.duplex = ndc->duplex;
1089 cmd->base.port = PORT_OTHER;
1094 static int netvsc_set_link_ksettings(struct net_device *dev,
1095 const struct ethtool_link_ksettings *cmd)
1097 struct net_device_context *ndc = netdev_priv(dev);
1100 speed = cmd->base.speed;
1101 if (!ethtool_validate_speed(speed) ||
1102 !ethtool_validate_duplex(cmd->base.duplex) ||
1103 !netvsc_validate_ethtool_ss_cmd(cmd))
1107 ndc->duplex = cmd->base.duplex;
1112 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
1114 struct net_device_context *ndevctx = netdev_priv(ndev);
1115 struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
1116 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1117 int orig_mtu = ndev->mtu;
1118 struct netvsc_device_info *device_info;
1121 if (!nvdev || nvdev->destroy)
1124 device_info = netvsc_devinfo_get(nvdev);
1129 /* Change MTU of underlying VF netdev first. */
1131 ret = dev_set_mtu(vf_netdev, mtu);
1136 ret = netvsc_detach(ndev, nvdev);
1142 ret = netvsc_attach(ndev, device_info);
1146 /* Attempt rollback to original MTU */
1147 ndev->mtu = orig_mtu;
1149 if (netvsc_attach(ndev, device_info))
1150 netdev_err(ndev, "restoring mtu failed\n");
1153 dev_set_mtu(vf_netdev, orig_mtu);
1160 static void netvsc_get_vf_stats(struct net_device *net,
1161 struct netvsc_vf_pcpu_stats *tot)
1163 struct net_device_context *ndev_ctx = netdev_priv(net);
1166 memset(tot, 0, sizeof(*tot));
1168 for_each_possible_cpu(i) {
1169 const struct netvsc_vf_pcpu_stats *stats
1170 = per_cpu_ptr(ndev_ctx->vf_stats, i);
1171 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1175 start = u64_stats_fetch_begin_irq(&stats->syncp);
1176 rx_packets = stats->rx_packets;
1177 tx_packets = stats->tx_packets;
1178 rx_bytes = stats->rx_bytes;
1179 tx_bytes = stats->tx_bytes;
1180 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1182 tot->rx_packets += rx_packets;
1183 tot->tx_packets += tx_packets;
1184 tot->rx_bytes += rx_bytes;
1185 tot->tx_bytes += tx_bytes;
1186 tot->tx_dropped += stats->tx_dropped;
1190 static void netvsc_get_pcpu_stats(struct net_device *net,
1191 struct netvsc_ethtool_pcpu_stats *pcpu_tot)
1193 struct net_device_context *ndev_ctx = netdev_priv(net);
1194 struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
1197 /* fetch percpu stats of vf */
1198 for_each_possible_cpu(i) {
1199 const struct netvsc_vf_pcpu_stats *stats =
1200 per_cpu_ptr(ndev_ctx->vf_stats, i);
1201 struct netvsc_ethtool_pcpu_stats *this_tot = &pcpu_tot[i];
1205 start = u64_stats_fetch_begin_irq(&stats->syncp);
1206 this_tot->vf_rx_packets = stats->rx_packets;
1207 this_tot->vf_tx_packets = stats->tx_packets;
1208 this_tot->vf_rx_bytes = stats->rx_bytes;
1209 this_tot->vf_tx_bytes = stats->tx_bytes;
1210 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1211 this_tot->rx_packets = this_tot->vf_rx_packets;
1212 this_tot->tx_packets = this_tot->vf_tx_packets;
1213 this_tot->rx_bytes = this_tot->vf_rx_bytes;
1214 this_tot->tx_bytes = this_tot->vf_tx_bytes;
1217 /* fetch percpu stats of netvsc */
1218 for (i = 0; i < nvdev->num_chn; i++) {
1219 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1220 const struct netvsc_stats *stats;
1221 struct netvsc_ethtool_pcpu_stats *this_tot =
1222 &pcpu_tot[nvchan->channel->target_cpu];
1226 stats = &nvchan->tx_stats;
1228 start = u64_stats_fetch_begin_irq(&stats->syncp);
1229 packets = stats->packets;
1230 bytes = stats->bytes;
1231 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1233 this_tot->tx_bytes += bytes;
1234 this_tot->tx_packets += packets;
1236 stats = &nvchan->rx_stats;
1238 start = u64_stats_fetch_begin_irq(&stats->syncp);
1239 packets = stats->packets;
1240 bytes = stats->bytes;
1241 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1243 this_tot->rx_bytes += bytes;
1244 this_tot->rx_packets += packets;
1248 static void netvsc_get_stats64(struct net_device *net,
1249 struct rtnl_link_stats64 *t)
1251 struct net_device_context *ndev_ctx = netdev_priv(net);
1252 struct netvsc_device *nvdev;
1253 struct netvsc_vf_pcpu_stats vf_tot;
1258 nvdev = rcu_dereference(ndev_ctx->nvdev);
1262 netdev_stats_to_stats64(t, &net->stats);
1264 netvsc_get_vf_stats(net, &vf_tot);
1265 t->rx_packets += vf_tot.rx_packets;
1266 t->tx_packets += vf_tot.tx_packets;
1267 t->rx_bytes += vf_tot.rx_bytes;
1268 t->tx_bytes += vf_tot.tx_bytes;
1269 t->tx_dropped += vf_tot.tx_dropped;
1271 for (i = 0; i < nvdev->num_chn; i++) {
1272 const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1273 const struct netvsc_stats *stats;
1274 u64 packets, bytes, multicast;
1277 stats = &nvchan->tx_stats;
1279 start = u64_stats_fetch_begin_irq(&stats->syncp);
1280 packets = stats->packets;
1281 bytes = stats->bytes;
1282 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1284 t->tx_bytes += bytes;
1285 t->tx_packets += packets;
1287 stats = &nvchan->rx_stats;
1289 start = u64_stats_fetch_begin_irq(&stats->syncp);
1290 packets = stats->packets;
1291 bytes = stats->bytes;
1292 multicast = stats->multicast + stats->broadcast;
1293 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
1295 t->rx_bytes += bytes;
1296 t->rx_packets += packets;
1297 t->multicast += multicast;
1303 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
1305 struct net_device_context *ndc = netdev_priv(ndev);
1306 struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
1307 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1308 struct sockaddr *addr = p;
1311 err = eth_prepare_mac_addr_change(ndev, p);
1319 err = dev_set_mac_address(vf_netdev, addr, NULL);
1324 err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
1326 eth_commit_mac_addr_change(ndev, p);
1327 } else if (vf_netdev) {
1328 /* rollback change on VF */
1329 memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
1330 dev_set_mac_address(vf_netdev, addr, NULL);
1336 static const struct {
1337 char name[ETH_GSTRING_LEN];
1339 } netvsc_stats[] = {
1340 { "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
1341 { "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
1342 { "tx_no_space", offsetof(struct netvsc_ethtool_stats, tx_no_space) },
1343 { "tx_too_big", offsetof(struct netvsc_ethtool_stats, tx_too_big) },
1344 { "tx_busy", offsetof(struct netvsc_ethtool_stats, tx_busy) },
1345 { "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
1346 { "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
1347 { "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) },
1348 { "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },
1349 { "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },
1351 { "cpu%u_rx_packets",
1352 offsetof(struct netvsc_ethtool_pcpu_stats, rx_packets) },
1354 offsetof(struct netvsc_ethtool_pcpu_stats, rx_bytes) },
1355 { "cpu%u_tx_packets",
1356 offsetof(struct netvsc_ethtool_pcpu_stats, tx_packets) },
1358 offsetof(struct netvsc_ethtool_pcpu_stats, tx_bytes) },
1359 { "cpu%u_vf_rx_packets",
1360 offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_packets) },
1361 { "cpu%u_vf_rx_bytes",
1362 offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_bytes) },
1363 { "cpu%u_vf_tx_packets",
1364 offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_packets) },
1365 { "cpu%u_vf_tx_bytes",
1366 offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_bytes) },
1368 { "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
1369 { "vf_rx_bytes", offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
1370 { "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
1371 { "vf_tx_bytes", offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
1372 { "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
1375 #define NETVSC_GLOBAL_STATS_LEN ARRAY_SIZE(netvsc_stats)
1376 #define NETVSC_VF_STATS_LEN ARRAY_SIZE(vf_stats)
1378 /* statistics per queue (rx/tx packets/bytes) */
1379 #define NETVSC_PCPU_STATS_LEN (num_present_cpus() * ARRAY_SIZE(pcpu_stats))
1381 /* 4 statistics per queue (rx/tx packets/bytes) */
1382 #define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 4)
1384 static int netvsc_get_sset_count(struct net_device *dev, int string_set)
1386 struct net_device_context *ndc = netdev_priv(dev);
1387 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1392 switch (string_set) {
1394 return NETVSC_GLOBAL_STATS_LEN
1395 + NETVSC_VF_STATS_LEN
1396 + NETVSC_QUEUE_STATS_LEN(nvdev)
1397 + NETVSC_PCPU_STATS_LEN;
1403 static void netvsc_get_ethtool_stats(struct net_device *dev,
1404 struct ethtool_stats *stats, u64 *data)
1406 struct net_device_context *ndc = netdev_priv(dev);
1407 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1408 const void *nds = &ndc->eth_stats;
1409 const struct netvsc_stats *qstats;
1410 struct netvsc_vf_pcpu_stats sum;
1411 struct netvsc_ethtool_pcpu_stats *pcpu_sum;
1419 for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
1420 data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
1422 netvsc_get_vf_stats(dev, &sum);
1423 for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
1424 data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
1426 for (j = 0; j < nvdev->num_chn; j++) {
1427 qstats = &nvdev->chan_table[j].tx_stats;
1430 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1431 packets = qstats->packets;
1432 bytes = qstats->bytes;
1433 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1434 data[i++] = packets;
1437 qstats = &nvdev->chan_table[j].rx_stats;
1439 start = u64_stats_fetch_begin_irq(&qstats->syncp);
1440 packets = qstats->packets;
1441 bytes = qstats->bytes;
1442 } while (u64_stats_fetch_retry_irq(&qstats->syncp, start));
1443 data[i++] = packets;
1447 pcpu_sum = kvmalloc_array(num_possible_cpus(),
1448 sizeof(struct netvsc_ethtool_pcpu_stats),
1450 netvsc_get_pcpu_stats(dev, pcpu_sum);
1451 for_each_present_cpu(cpu) {
1452 struct netvsc_ethtool_pcpu_stats *this_sum = &pcpu_sum[cpu];
1454 for (j = 0; j < ARRAY_SIZE(pcpu_stats); j++)
1455 data[i++] = *(u64 *)((void *)this_sum
1456 + pcpu_stats[j].offset);
1461 static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
1463 struct net_device_context *ndc = netdev_priv(dev);
1464 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1471 switch (stringset) {
1473 for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++) {
1474 memcpy(p, netvsc_stats[i].name, ETH_GSTRING_LEN);
1475 p += ETH_GSTRING_LEN;
1478 for (i = 0; i < ARRAY_SIZE(vf_stats); i++) {
1479 memcpy(p, vf_stats[i].name, ETH_GSTRING_LEN);
1480 p += ETH_GSTRING_LEN;
1483 for (i = 0; i < nvdev->num_chn; i++) {
1484 sprintf(p, "tx_queue_%u_packets", i);
1485 p += ETH_GSTRING_LEN;
1486 sprintf(p, "tx_queue_%u_bytes", i);
1487 p += ETH_GSTRING_LEN;
1488 sprintf(p, "rx_queue_%u_packets", i);
1489 p += ETH_GSTRING_LEN;
1490 sprintf(p, "rx_queue_%u_bytes", i);
1491 p += ETH_GSTRING_LEN;
1494 for_each_present_cpu(cpu) {
1495 for (i = 0; i < ARRAY_SIZE(pcpu_stats); i++) {
1496 sprintf(p, pcpu_stats[i].name, cpu);
1497 p += ETH_GSTRING_LEN;
1506 netvsc_get_rss_hash_opts(struct net_device_context *ndc,
1507 struct ethtool_rxnfc *info)
1509 const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;
1511 info->data = RXH_IP_SRC | RXH_IP_DST;
1513 switch (info->flow_type) {
1515 if (ndc->l4_hash & HV_TCP4_L4HASH)
1516 info->data |= l4_flag;
1521 if (ndc->l4_hash & HV_TCP6_L4HASH)
1522 info->data |= l4_flag;
1527 if (ndc->l4_hash & HV_UDP4_L4HASH)
1528 info->data |= l4_flag;
1533 if (ndc->l4_hash & HV_UDP6_L4HASH)
1534 info->data |= l4_flag;
1550 netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
1553 struct net_device_context *ndc = netdev_priv(dev);
1554 struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
1559 switch (info->cmd) {
1560 case ETHTOOL_GRXRINGS:
1561 info->data = nvdev->num_chn;
1565 return netvsc_get_rss_hash_opts(ndc, info);
1570 static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
1571 struct ethtool_rxnfc *info)
1573 if (info->data == (RXH_IP_SRC | RXH_IP_DST |
1574 RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
1575 switch (info->flow_type) {
1577 ndc->l4_hash |= HV_TCP4_L4HASH;
1581 ndc->l4_hash |= HV_TCP6_L4HASH;
1585 ndc->l4_hash |= HV_UDP4_L4HASH;
1589 ndc->l4_hash |= HV_UDP6_L4HASH;
1599 if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
1600 switch (info->flow_type) {
1602 ndc->l4_hash &= ~HV_TCP4_L4HASH;
1606 ndc->l4_hash &= ~HV_TCP6_L4HASH;
1610 ndc->l4_hash &= ~HV_UDP4_L4HASH;
1614 ndc->l4_hash &= ~HV_UDP6_L4HASH;
1628 netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
1630 struct net_device_context *ndc = netdev_priv(ndev);
1632 if (info->cmd == ETHTOOL_SRXFH)
1633 return netvsc_set_rss_hash_opts(ndc, info);
1638 static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
1640 return NETVSC_HASH_KEYLEN;
1643 static u32 netvsc_rss_indir_size(struct net_device *dev)
1648 static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
1651 struct net_device_context *ndc = netdev_priv(dev);
1652 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1653 struct rndis_device *rndis_dev;
1660 *hfunc = ETH_RSS_HASH_TOP; /* Toeplitz */
1662 rndis_dev = ndev->extension;
1664 for (i = 0; i < ITAB_NUM; i++)
1665 indir[i] = rndis_dev->rx_table[i];
1669 memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
1674 static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
1675 const u8 *key, const u8 hfunc)
1677 struct net_device_context *ndc = netdev_priv(dev);
1678 struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
1679 struct rndis_device *rndis_dev;
1685 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
1688 rndis_dev = ndev->extension;
1690 for (i = 0; i < ITAB_NUM; i++)
1691 if (indir[i] >= ndev->num_chn)
1694 for (i = 0; i < ITAB_NUM; i++)
1695 rndis_dev->rx_table[i] = indir[i];
1702 key = rndis_dev->rss_key;
1705 return rndis_filter_set_rss_param(rndis_dev, key);
1708 /* Hyper-V RNDIS protocol does not have ring in the HW sense.
1709 * It does have pre-allocated receive area which is divided into sections.
1711 static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
1712 struct ethtool_ringparam *ring)
1716 ring->rx_pending = nvdev->recv_section_cnt;
1717 ring->tx_pending = nvdev->send_section_cnt;
1719 if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
1720 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
1722 max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
1724 ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
1725 ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
1726 / nvdev->send_section_size;
1729 static void netvsc_get_ringparam(struct net_device *ndev,
1730 struct ethtool_ringparam *ring)
1732 struct net_device_context *ndevctx = netdev_priv(ndev);
1733 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1738 __netvsc_get_ringparam(nvdev, ring);
1741 static int netvsc_set_ringparam(struct net_device *ndev,
1742 struct ethtool_ringparam *ring)
1744 struct net_device_context *ndevctx = netdev_priv(ndev);
1745 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1746 struct netvsc_device_info *device_info;
1747 struct ethtool_ringparam orig;
1751 if (!nvdev || nvdev->destroy)
1754 memset(&orig, 0, sizeof(orig));
1755 __netvsc_get_ringparam(nvdev, &orig);
1757 new_tx = clamp_t(u32, ring->tx_pending,
1758 NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
1759 new_rx = clamp_t(u32, ring->rx_pending,
1760 NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
1762 if (new_tx == orig.tx_pending &&
1763 new_rx == orig.rx_pending)
1764 return 0; /* no change */
1766 device_info = netvsc_devinfo_get(nvdev);
1771 device_info->send_sections = new_tx;
1772 device_info->recv_sections = new_rx;
1774 ret = netvsc_detach(ndev, nvdev);
1778 ret = netvsc_attach(ndev, device_info);
1780 device_info->send_sections = orig.tx_pending;
1781 device_info->recv_sections = orig.rx_pending;
1783 if (netvsc_attach(ndev, device_info))
1784 netdev_err(ndev, "restoring ringparam failed");
1792 static int netvsc_set_features(struct net_device *ndev,
1793 netdev_features_t features)
1795 netdev_features_t change = features ^ ndev->features;
1796 struct net_device_context *ndevctx = netdev_priv(ndev);
1797 struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
1798 struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
1799 struct ndis_offload_params offloads;
1802 if (!nvdev || nvdev->destroy)
1805 if (!(change & NETIF_F_LRO))
1808 memset(&offloads, 0, sizeof(struct ndis_offload_params));
1810 if (features & NETIF_F_LRO) {
1811 offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1812 offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1814 offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1815 offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1818 ret = rndis_filter_set_offload_params(ndev, nvdev, &offloads);
1821 features ^= NETIF_F_LRO;
1822 ndev->features = features;
1829 vf_netdev->wanted_features = features;
1830 netdev_update_features(vf_netdev);
1835 static u32 netvsc_get_msglevel(struct net_device *ndev)
1837 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1839 return ndev_ctx->msg_enable;
1842 static void netvsc_set_msglevel(struct net_device *ndev, u32 val)
1844 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1846 ndev_ctx->msg_enable = val;
1849 static const struct ethtool_ops ethtool_ops = {
1850 .get_drvinfo = netvsc_get_drvinfo,
1851 .get_msglevel = netvsc_get_msglevel,
1852 .set_msglevel = netvsc_set_msglevel,
1853 .get_link = ethtool_op_get_link,
1854 .get_ethtool_stats = netvsc_get_ethtool_stats,
1855 .get_sset_count = netvsc_get_sset_count,
1856 .get_strings = netvsc_get_strings,
1857 .get_channels = netvsc_get_channels,
1858 .set_channels = netvsc_set_channels,
1859 .get_ts_info = ethtool_op_get_ts_info,
1860 .get_rxnfc = netvsc_get_rxnfc,
1861 .set_rxnfc = netvsc_set_rxnfc,
1862 .get_rxfh_key_size = netvsc_get_rxfh_key_size,
1863 .get_rxfh_indir_size = netvsc_rss_indir_size,
1864 .get_rxfh = netvsc_get_rxfh,
1865 .set_rxfh = netvsc_set_rxfh,
1866 .get_link_ksettings = netvsc_get_link_ksettings,
1867 .set_link_ksettings = netvsc_set_link_ksettings,
1868 .get_ringparam = netvsc_get_ringparam,
1869 .set_ringparam = netvsc_set_ringparam,
1872 static const struct net_device_ops device_ops = {
1873 .ndo_open = netvsc_open,
1874 .ndo_stop = netvsc_close,
1875 .ndo_start_xmit = netvsc_start_xmit,
1876 .ndo_change_rx_flags = netvsc_change_rx_flags,
1877 .ndo_set_rx_mode = netvsc_set_rx_mode,
1878 .ndo_set_features = netvsc_set_features,
1879 .ndo_change_mtu = netvsc_change_mtu,
1880 .ndo_validate_addr = eth_validate_addr,
1881 .ndo_set_mac_address = netvsc_set_mac_addr,
1882 .ndo_select_queue = netvsc_select_queue,
1883 .ndo_get_stats64 = netvsc_get_stats64,
1887 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
1888 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
1889 * present send GARP packet to network peers with netif_notify_peers().
1891 static void netvsc_link_change(struct work_struct *w)
1893 struct net_device_context *ndev_ctx =
1894 container_of(w, struct net_device_context, dwork.work);
1895 struct hv_device *device_obj = ndev_ctx->device_ctx;
1896 struct net_device *net = hv_get_drvdata(device_obj);
1897 struct netvsc_device *net_device;
1898 struct rndis_device *rdev;
1899 struct netvsc_reconfig *event = NULL;
1900 bool notify = false, reschedule = false;
1901 unsigned long flags, next_reconfig, delay;
1903 /* if changes are happening, comeback later */
1904 if (!rtnl_trylock()) {
1905 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1909 net_device = rtnl_dereference(ndev_ctx->nvdev);
1913 rdev = net_device->extension;
1915 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
1916 if (time_is_after_jiffies(next_reconfig)) {
1917 /* link_watch only sends one notification with current state
1918 * per second, avoid doing reconfig more frequently. Handle
1921 delay = next_reconfig - jiffies;
1922 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
1923 schedule_delayed_work(&ndev_ctx->dwork, delay);
1926 ndev_ctx->last_reconfig = jiffies;
1928 spin_lock_irqsave(&ndev_ctx->lock, flags);
1929 if (!list_empty(&ndev_ctx->reconfig_events)) {
1930 event = list_first_entry(&ndev_ctx->reconfig_events,
1931 struct netvsc_reconfig, list);
1932 list_del(&event->list);
1933 reschedule = !list_empty(&ndev_ctx->reconfig_events);
1935 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1940 switch (event->event) {
1941 /* Only the following events are possible due to the check in
1942 * netvsc_linkstatus_callback()
1944 case RNDIS_STATUS_MEDIA_CONNECT:
1945 if (rdev->link_state) {
1946 rdev->link_state = false;
1947 netif_carrier_on(net);
1948 netvsc_tx_enable(net_device, net);
1954 case RNDIS_STATUS_MEDIA_DISCONNECT:
1955 if (!rdev->link_state) {
1956 rdev->link_state = true;
1957 netif_carrier_off(net);
1958 netvsc_tx_disable(net_device, net);
1962 case RNDIS_STATUS_NETWORK_CHANGE:
1963 /* Only makes sense if carrier is present */
1964 if (!rdev->link_state) {
1965 rdev->link_state = true;
1966 netif_carrier_off(net);
1967 netvsc_tx_disable(net_device, net);
1968 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1969 spin_lock_irqsave(&ndev_ctx->lock, flags);
1970 list_add(&event->list, &ndev_ctx->reconfig_events);
1971 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1980 netdev_notify_peers(net);
1982 /* link_watch only sends one notification with current state per
1983 * second, handle next reconfig event in 2 seconds.
1986 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1994 static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
1996 struct net_device_context *net_device_ctx;
1997 struct net_device *dev;
1999 dev = netdev_master_upper_dev_get(vf_netdev);
2000 if (!dev || dev->netdev_ops != &device_ops)
2001 return NULL; /* not a netvsc device */
2003 net_device_ctx = netdev_priv(dev);
2004 if (!rtnl_dereference(net_device_ctx->nvdev))
2005 return NULL; /* device is removed */
2010 /* Called when VF is injecting data into network stack.
2011 * Change the associated network device from VF to netvsc.
2012 * note: already called with rcu_read_lock
2014 static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
2016 struct sk_buff *skb = *pskb;
2017 struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
2018 struct net_device_context *ndev_ctx = netdev_priv(ndev);
2019 struct netvsc_vf_pcpu_stats *pcpu_stats
2020 = this_cpu_ptr(ndev_ctx->vf_stats);
2022 skb = skb_share_check(skb, GFP_ATOMIC);
2024 return RX_HANDLER_CONSUMED;
2030 u64_stats_update_begin(&pcpu_stats->syncp);
2031 pcpu_stats->rx_packets++;
2032 pcpu_stats->rx_bytes += skb->len;
2033 u64_stats_update_end(&pcpu_stats->syncp);
2035 return RX_HANDLER_ANOTHER;
2038 static int netvsc_vf_join(struct net_device *vf_netdev,
2039 struct net_device *ndev)
2041 struct net_device_context *ndev_ctx = netdev_priv(ndev);
2044 ret = netdev_rx_handler_register(vf_netdev,
2045 netvsc_vf_handle_frame, ndev);
2047 netdev_err(vf_netdev,
2048 "can not register netvsc VF receive handler (err = %d)\n",
2050 goto rx_handler_failed;
2053 ret = netdev_master_upper_dev_link(vf_netdev, ndev,
2056 netdev_err(vf_netdev,
2057 "can not set master device %s (err = %d)\n",
2059 goto upper_link_failed;
2062 /* set slave flag before open to prevent IPv6 addrconf */
2063 vf_netdev->flags |= IFF_SLAVE;
2065 schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
2067 call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
2069 netdev_info(vf_netdev, "joined to %s\n", ndev->name);
2073 netdev_rx_handler_unregister(vf_netdev);
2078 static void __netvsc_vf_setup(struct net_device *ndev,
2079 struct net_device *vf_netdev)
2083 /* Align MTU of VF with master */
2084 ret = dev_set_mtu(vf_netdev, ndev->mtu);
2086 netdev_warn(vf_netdev,
2087 "unable to change mtu to %u\n", ndev->mtu);
2089 /* set multicast etc flags on VF */
2090 dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE, NULL);
2092 /* sync address list from ndev to VF */
2093 netif_addr_lock_bh(ndev);
2094 dev_uc_sync(vf_netdev, ndev);
2095 dev_mc_sync(vf_netdev, ndev);
2096 netif_addr_unlock_bh(ndev);
2098 if (netif_running(ndev)) {
2099 ret = dev_open(vf_netdev, NULL);
2101 netdev_warn(vf_netdev,
2102 "unable to open: %d\n", ret);
2106 /* Setup VF as slave of the synthetic device.
2107 * Runs in workqueue to avoid recursion in netlink callbacks.
2109 static void netvsc_vf_setup(struct work_struct *w)
2111 struct net_device_context *ndev_ctx
2112 = container_of(w, struct net_device_context, vf_takeover.work);
2113 struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
2114 struct net_device *vf_netdev;
2116 if (!rtnl_trylock()) {
2117 schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
2121 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2123 __netvsc_vf_setup(ndev, vf_netdev);
2128 /* Find netvsc by VF serial number.
2129 * The PCI hyperv controller records the serial number as the slot kobj name.
2131 static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev)
2133 struct device *parent = vf_netdev->dev.parent;
2134 struct net_device_context *ndev_ctx;
2135 struct pci_dev *pdev;
2138 if (!parent || !dev_is_pci(parent))
2139 return NULL; /* not a PCI device */
2141 pdev = to_pci_dev(parent);
2143 netdev_notice(vf_netdev, "no PCI slot information\n");
2147 if (kstrtou32(pci_slot_name(pdev->slot), 10, &serial)) {
2148 netdev_notice(vf_netdev, "Invalid vf serial:%s\n",
2149 pci_slot_name(pdev->slot));
2153 list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
2154 if (!ndev_ctx->vf_alloc)
2157 if (ndev_ctx->vf_serial == serial)
2158 return hv_get_drvdata(ndev_ctx->device_ctx);
2161 netdev_notice(vf_netdev,
2162 "no netdev found for vf serial:%u\n", serial);
2166 static int netvsc_register_vf(struct net_device *vf_netdev)
2168 struct net_device_context *net_device_ctx;
2169 struct netvsc_device *netvsc_dev;
2170 struct net_device *ndev;
2173 if (vf_netdev->addr_len != ETH_ALEN)
2176 ndev = get_netvsc_byslot(vf_netdev);
2180 net_device_ctx = netdev_priv(ndev);
2181 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
2182 if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
2185 /* if synthetic interface is a different namespace,
2186 * then move the VF to that namespace; join will be
2187 * done again in that context.
2189 if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {
2190 ret = dev_change_net_namespace(vf_netdev,
2191 dev_net(ndev), "eth%d");
2193 netdev_err(vf_netdev,
2194 "could not move to same namespace as %s: %d\n",
2197 netdev_info(vf_netdev,
2198 "VF moved to namespace with: %s\n",
2203 netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
2205 if (netvsc_vf_join(vf_netdev, ndev) != 0)
2208 dev_hold(vf_netdev);
2209 rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
2211 vf_netdev->wanted_features = ndev->features;
2212 netdev_update_features(vf_netdev);
2217 /* VF up/down change detected, schedule to change data path */
2218 static int netvsc_vf_changed(struct net_device *vf_netdev)
2220 struct net_device_context *net_device_ctx;
2221 struct netvsc_device *netvsc_dev;
2222 struct net_device *ndev;
2223 bool vf_is_up = netif_running(vf_netdev);
2225 ndev = get_netvsc_byref(vf_netdev);
2229 net_device_ctx = netdev_priv(ndev);
2230 netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
2234 netvsc_switch_datapath(ndev, vf_is_up);
2235 netdev_info(ndev, "Data path switched %s VF: %s\n",
2236 vf_is_up ? "to" : "from", vf_netdev->name);
2241 static int netvsc_unregister_vf(struct net_device *vf_netdev)
2243 struct net_device *ndev;
2244 struct net_device_context *net_device_ctx;
2246 ndev = get_netvsc_byref(vf_netdev);
2250 net_device_ctx = netdev_priv(ndev);
2251 cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
2253 netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
2255 netdev_rx_handler_unregister(vf_netdev);
2256 netdev_upper_dev_unlink(vf_netdev, ndev);
2257 RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
2263 static int netvsc_probe(struct hv_device *dev,
2264 const struct hv_vmbus_device_id *dev_id)
2266 struct net_device *net = NULL;
2267 struct net_device_context *net_device_ctx;
2268 struct netvsc_device_info *device_info = NULL;
2269 struct netvsc_device *nvdev;
2272 net = alloc_etherdev_mq(sizeof(struct net_device_context),
2277 netif_carrier_off(net);
2279 netvsc_init_settings(net);
2281 net_device_ctx = netdev_priv(net);
2282 net_device_ctx->device_ctx = dev;
2283 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
2284 if (netif_msg_probe(net_device_ctx))
2285 netdev_dbg(net, "netvsc msg_enable: %d\n",
2286 net_device_ctx->msg_enable);
2288 hv_set_drvdata(dev, net);
2290 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
2292 spin_lock_init(&net_device_ctx->lock);
2293 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
2294 INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
2296 net_device_ctx->vf_stats
2297 = netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
2298 if (!net_device_ctx->vf_stats)
2301 net->netdev_ops = &device_ops;
2302 net->ethtool_ops = ðtool_ops;
2303 SET_NETDEV_DEV(net, &dev->device);
2305 /* We always need headroom for rndis header */
2306 net->needed_headroom = RNDIS_AND_PPI_SIZE;
2308 /* Initialize the number of queues to be 1, we may change it if more
2309 * channels are offered later.
2311 netif_set_real_num_tx_queues(net, 1);
2312 netif_set_real_num_rx_queues(net, 1);
2314 /* Notify the netvsc driver of the new device */
2315 device_info = netvsc_devinfo_get(NULL);
2319 goto devinfo_failed;
2322 nvdev = rndis_filter_device_add(dev, device_info);
2323 if (IS_ERR(nvdev)) {
2324 ret = PTR_ERR(nvdev);
2325 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
2329 memcpy(net->dev_addr, device_info->mac_adr, ETH_ALEN);
2331 /* We must get rtnl lock before scheduling nvdev->subchan_work,
2332 * otherwise netvsc_subchan_work() can get rtnl lock first and wait
2333 * all subchannels to show up, but that may not happen because
2334 * netvsc_probe() can't get rtnl lock and as a result vmbus_onoffer()
2335 * -> ... -> device_add() -> ... -> __device_attach() can't get
2336 * the device lock, so all the subchannels can't be processed --
2337 * finally netvsc_subchan_work() hangs forever.
2341 if (nvdev->num_chn > 1)
2342 schedule_work(&nvdev->subchan_work);
2344 /* hw_features computed in rndis_netdev_set_hwcaps() */
2345 net->features = net->hw_features |
2346 NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX |
2347 NETIF_F_HW_VLAN_CTAG_RX;
2348 net->vlan_features = net->features;
2350 /* MTU range: 68 - 1500 or 65521 */
2351 net->min_mtu = NETVSC_MTU_MIN;
2352 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
2353 net->max_mtu = NETVSC_MTU - ETH_HLEN;
2355 net->max_mtu = ETH_DATA_LEN;
2357 ret = register_netdevice(net);
2359 pr_err("Unable to register netdev.\n");
2360 goto register_failed;
2363 list_add(&net_device_ctx->list, &netvsc_dev_list);
2371 rndis_filter_device_remove(dev, nvdev);
2375 free_percpu(net_device_ctx->vf_stats);
2377 hv_set_drvdata(dev, NULL);
2383 static int netvsc_remove(struct hv_device *dev)
2385 struct net_device_context *ndev_ctx;
2386 struct net_device *vf_netdev, *net;
2387 struct netvsc_device *nvdev;
2389 net = hv_get_drvdata(dev);
2391 dev_err(&dev->device, "No net device to remove\n");
2395 ndev_ctx = netdev_priv(net);
2397 cancel_delayed_work_sync(&ndev_ctx->dwork);
2400 nvdev = rtnl_dereference(ndev_ctx->nvdev);
2402 cancel_work_sync(&nvdev->subchan_work);
2405 * Call to the vsc driver to let it know that the device is being
2406 * removed. Also blocks mtu and channel changes.
2408 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2410 netvsc_unregister_vf(vf_netdev);
2413 rndis_filter_device_remove(dev, nvdev);
2415 unregister_netdevice(net);
2416 list_del(&ndev_ctx->list);
2420 hv_set_drvdata(dev, NULL);
2422 free_percpu(ndev_ctx->vf_stats);
2427 static int netvsc_suspend(struct hv_device *dev)
2429 struct net_device_context *ndev_ctx;
2430 struct net_device *vf_netdev, *net;
2431 struct netvsc_device *nvdev;
2434 net = hv_get_drvdata(dev);
2436 ndev_ctx = netdev_priv(net);
2437 cancel_delayed_work_sync(&ndev_ctx->dwork);
2441 nvdev = rtnl_dereference(ndev_ctx->nvdev);
2442 if (nvdev == NULL) {
2447 vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
2449 netvsc_unregister_vf(vf_netdev);
2451 /* Save the current config info */
2452 ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
2454 ret = netvsc_detach(net, nvdev);
2461 static int netvsc_resume(struct hv_device *dev)
2463 struct net_device *net = hv_get_drvdata(dev);
2464 struct net_device_context *net_device_ctx;
2465 struct netvsc_device_info *device_info;
2470 net_device_ctx = netdev_priv(net);
2471 device_info = net_device_ctx->saved_netvsc_dev_info;
2473 ret = netvsc_attach(net, device_info);
2478 net_device_ctx->saved_netvsc_dev_info = NULL;
2482 static const struct hv_vmbus_device_id id_table[] = {
2488 MODULE_DEVICE_TABLE(vmbus, id_table);
2490 /* The one and only one */
2491 static struct hv_driver netvsc_drv = {
2492 .name = KBUILD_MODNAME,
2493 .id_table = id_table,
2494 .probe = netvsc_probe,
2495 .remove = netvsc_remove,
2496 .suspend = netvsc_suspend,
2497 .resume = netvsc_resume,
2499 .probe_type = PROBE_FORCE_SYNCHRONOUS,
2504 * On Hyper-V, every VF interface is matched with a corresponding
2505 * synthetic interface. The synthetic interface is presented first
2506 * to the guest. When the corresponding VF instance is registered,
2507 * we will take care of switching the data path.
2509 static int netvsc_netdev_event(struct notifier_block *this,
2510 unsigned long event, void *ptr)
2512 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2514 /* Skip our own events */
2515 if (event_dev->netdev_ops == &device_ops)
2518 /* Avoid non-Ethernet type devices */
2519 if (event_dev->type != ARPHRD_ETHER)
2522 /* Avoid Vlan dev with same MAC registering as VF */
2523 if (is_vlan_dev(event_dev))
2526 /* Avoid Bonding master dev with same MAC registering as VF */
2527 if ((event_dev->priv_flags & IFF_BONDING) &&
2528 (event_dev->flags & IFF_MASTER))
2532 case NETDEV_REGISTER:
2533 return netvsc_register_vf(event_dev);
2534 case NETDEV_UNREGISTER:
2535 return netvsc_unregister_vf(event_dev);
2538 return netvsc_vf_changed(event_dev);
2544 static struct notifier_block netvsc_netdev_notifier = {
2545 .notifier_call = netvsc_netdev_event,
2548 static void __exit netvsc_drv_exit(void)
2550 unregister_netdevice_notifier(&netvsc_netdev_notifier);
2551 vmbus_driver_unregister(&netvsc_drv);
2554 static int __init netvsc_drv_init(void)
2558 if (ring_size < RING_SIZE_MIN) {
2559 ring_size = RING_SIZE_MIN;
2560 pr_info("Increased ring_size to %u (min allowed)\n",
2563 netvsc_ring_bytes = ring_size * PAGE_SIZE;
2565 ret = vmbus_driver_register(&netvsc_drv);
2569 register_netdevice_notifier(&netvsc_netdev_notifier);
2573 MODULE_LICENSE("GPL");
2574 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
2576 module_init(netvsc_drv_init);
2577 module_exit(netvsc_drv_exit);