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"
44 #define RING_SIZE_MIN 64
45 #define LINKCHANGE_INT (2 * HZ)
46 static int ring_size = 128;
47 module_param(ring_size, int, S_IRUGO);
48 MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
50 static int max_num_vrss_chns = 8;
52 static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
53 NETIF_MSG_LINK | NETIF_MSG_IFUP |
54 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
57 static int debug = -1;
58 module_param(debug, int, S_IRUGO);
59 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
61 static void do_set_multicast(struct work_struct *w)
63 struct net_device_context *ndevctx =
64 container_of(w, struct net_device_context, work);
65 struct netvsc_device *nvdev;
66 struct rndis_device *rdev;
68 nvdev = hv_get_drvdata(ndevctx->device_ctx);
69 if (nvdev == NULL || nvdev->ndev == NULL)
72 rdev = nvdev->extension;
76 if (nvdev->ndev->flags & IFF_PROMISC)
77 rndis_filter_set_packet_filter(rdev,
78 NDIS_PACKET_TYPE_PROMISCUOUS);
80 rndis_filter_set_packet_filter(rdev,
81 NDIS_PACKET_TYPE_BROADCAST |
82 NDIS_PACKET_TYPE_ALL_MULTICAST |
83 NDIS_PACKET_TYPE_DIRECTED);
86 static void netvsc_set_multicast_list(struct net_device *net)
88 struct net_device_context *net_device_ctx = netdev_priv(net);
90 schedule_work(&net_device_ctx->work);
93 static int netvsc_open(struct net_device *net)
95 struct net_device_context *net_device_ctx = netdev_priv(net);
96 struct hv_device *device_obj = net_device_ctx->device_ctx;
97 struct netvsc_device *nvdev;
98 struct rndis_device *rdev;
101 netif_carrier_off(net);
103 /* Open up the device */
104 ret = rndis_filter_open(device_obj);
106 netdev_err(net, "unable to open device (ret %d).\n", ret);
110 netif_tx_wake_all_queues(net);
112 nvdev = hv_get_drvdata(device_obj);
113 rdev = nvdev->extension;
114 if (!rdev->link_state)
115 netif_carrier_on(net);
120 static int netvsc_close(struct net_device *net)
122 struct net_device_context *net_device_ctx = netdev_priv(net);
123 struct hv_device *device_obj = net_device_ctx->device_ctx;
124 struct netvsc_device *nvdev = hv_get_drvdata(device_obj);
126 u32 aread, awrite, i, msec = 10, retry = 0, retry_max = 20;
127 struct vmbus_channel *chn;
129 netif_tx_disable(net);
131 /* Make sure netvsc_set_multicast_list doesn't re-enable filter! */
132 cancel_work_sync(&net_device_ctx->work);
133 ret = rndis_filter_close(device_obj);
135 netdev_err(net, "unable to close device (ret %d).\n", ret);
139 /* Ensure pending bytes in ring are read */
142 for (i = 0; i < nvdev->num_chn; i++) {
143 chn = nvdev->chn_table[i];
147 hv_get_ringbuffer_availbytes(&chn->inbound, &aread,
153 hv_get_ringbuffer_availbytes(&chn->outbound, &aread,
161 if (retry > retry_max || aread == 0)
171 netdev_err(net, "Ring buffer not empty after closing rndis\n");
178 static void *init_ppi_data(struct rndis_message *msg, u32 ppi_size,
181 struct rndis_packet *rndis_pkt;
182 struct rndis_per_packet_info *ppi;
184 rndis_pkt = &msg->msg.pkt;
185 rndis_pkt->data_offset += ppi_size;
187 ppi = (struct rndis_per_packet_info *)((void *)rndis_pkt +
188 rndis_pkt->per_pkt_info_offset + rndis_pkt->per_pkt_info_len);
190 ppi->size = ppi_size;
191 ppi->type = pkt_type;
192 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
194 rndis_pkt->per_pkt_info_len += ppi_size;
199 static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
200 void *accel_priv, select_queue_fallback_t fallback)
202 struct net_device_context *net_device_ctx = netdev_priv(ndev);
203 struct hv_device *hdev = net_device_ctx->device_ctx;
204 struct netvsc_device *nvsc_dev = hv_get_drvdata(hdev);
208 if (nvsc_dev == NULL || ndev->real_num_tx_queues <= 1)
211 hash = skb_get_hash(skb);
212 q_idx = nvsc_dev->send_table[hash % VRSS_SEND_TAB_SIZE] %
213 ndev->real_num_tx_queues;
215 if (!nvsc_dev->chn_table[q_idx])
221 static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
222 struct hv_page_buffer *pb)
226 /* Deal with compund pages by ignoring unused part
229 page += (offset >> PAGE_SHIFT);
230 offset &= ~PAGE_MASK;
235 bytes = PAGE_SIZE - offset;
238 pb[j].pfn = page_to_pfn(page);
239 pb[j].offset = offset;
245 if (offset == PAGE_SIZE && len) {
255 static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
256 struct hv_netvsc_packet *packet,
257 struct hv_page_buffer **page_buf)
259 struct hv_page_buffer *pb = *page_buf;
261 char *data = skb->data;
262 int frags = skb_shinfo(skb)->nr_frags;
265 /* The packet is laid out thus:
266 * 1. hdr: RNDIS header and PPI
268 * 3. skb fragment data
271 slots_used += fill_pg_buf(virt_to_page(hdr),
273 len, &pb[slots_used]);
275 packet->rmsg_size = len;
276 packet->rmsg_pgcnt = slots_used;
278 slots_used += fill_pg_buf(virt_to_page(data),
279 offset_in_page(data),
280 skb_headlen(skb), &pb[slots_used]);
282 for (i = 0; i < frags; i++) {
283 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
285 slots_used += fill_pg_buf(skb_frag_page(frag),
287 skb_frag_size(frag), &pb[slots_used]);
292 static int count_skb_frag_slots(struct sk_buff *skb)
294 int i, frags = skb_shinfo(skb)->nr_frags;
297 for (i = 0; i < frags; i++) {
298 skb_frag_t *frag = skb_shinfo(skb)->frags + i;
299 unsigned long size = skb_frag_size(frag);
300 unsigned long offset = frag->page_offset;
302 /* Skip unused frames from start of page */
303 offset &= ~PAGE_MASK;
304 pages += PFN_UP(offset + size);
309 static int netvsc_get_slots(struct sk_buff *skb)
311 char *data = skb->data;
312 unsigned int offset = offset_in_page(data);
313 unsigned int len = skb_headlen(skb);
317 slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
318 frag_slots = count_skb_frag_slots(skb);
319 return slots + frag_slots;
322 static u32 get_net_transport_info(struct sk_buff *skb, u32 *trans_off)
324 u32 ret_val = TRANSPORT_INFO_NOT_IP;
326 if ((eth_hdr(skb)->h_proto != htons(ETH_P_IP)) &&
327 (eth_hdr(skb)->h_proto != htons(ETH_P_IPV6))) {
331 *trans_off = skb_transport_offset(skb);
333 if ((eth_hdr(skb)->h_proto == htons(ETH_P_IP))) {
334 struct iphdr *iphdr = ip_hdr(skb);
336 if (iphdr->protocol == IPPROTO_TCP)
337 ret_val = TRANSPORT_INFO_IPV4_TCP;
338 else if (iphdr->protocol == IPPROTO_UDP)
339 ret_val = TRANSPORT_INFO_IPV4_UDP;
341 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
342 ret_val = TRANSPORT_INFO_IPV6_TCP;
343 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
344 ret_val = TRANSPORT_INFO_IPV6_UDP;
351 static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
353 struct net_device_context *net_device_ctx = netdev_priv(net);
354 struct hv_netvsc_packet *packet = NULL;
356 unsigned int num_data_pgs;
357 struct rndis_message *rndis_msg;
358 struct rndis_packet *rndis_pkt;
362 struct rndis_per_packet_info *ppi;
363 struct ndis_tcp_ip_checksum_info *csum_info;
364 struct ndis_tcp_lso_info *lso_info;
369 struct hv_page_buffer page_buf[MAX_PAGE_BUFFER_COUNT];
370 struct hv_page_buffer *pb = page_buf;
371 struct netvsc_stats *tx_stats = this_cpu_ptr(net_device_ctx->tx_stats);
373 /* We will atmost need two pages to describe the rndis
374 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
375 * of pages in a single packet. If skb is scattered around
376 * more pages we try linearizing it.
380 skb_length = skb->len;
381 num_data_pgs = netvsc_get_slots(skb) + 2;
382 if (num_data_pgs > MAX_PAGE_BUFFER_COUNT && linear) {
383 net_alert_ratelimited("packet too big: %u pages (%u bytes)\n",
384 num_data_pgs, skb->len);
387 } else if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
388 if (skb_linearize(skb)) {
389 net_alert_ratelimited("failed to linearize skb\n");
398 * Place the rndis header in the skb head room and
399 * the skb->cb will be used for hv_netvsc_packet
402 ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
404 netdev_err(net, "unable to alloc hv_netvsc_packet\n");
408 /* Use the skb control buffer for building up the packet */
409 BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
410 FIELD_SIZEOF(struct sk_buff, cb));
411 packet = (struct hv_netvsc_packet *)skb->cb;
414 packet->q_idx = skb_get_queue_mapping(skb);
416 packet->total_data_buflen = skb->len;
418 rndis_msg = (struct rndis_message *)skb->head;
420 memset(rndis_msg, 0, RNDIS_AND_PPI_SIZE);
422 isvlan = skb->vlan_tci & VLAN_TAG_PRESENT;
424 /* Add the rndis header */
425 rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
426 rndis_msg->msg_len = packet->total_data_buflen;
427 rndis_pkt = &rndis_msg->msg.pkt;
428 rndis_pkt->data_offset = sizeof(struct rndis_packet);
429 rndis_pkt->data_len = packet->total_data_buflen;
430 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
432 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
434 hash = skb_get_hash_raw(skb);
435 if (hash != 0 && net->real_num_tx_queues > 1) {
436 rndis_msg_size += NDIS_HASH_PPI_SIZE;
437 ppi = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
439 *(u32 *)((void *)ppi + ppi->ppi_offset) = hash;
443 struct ndis_pkt_8021q_info *vlan;
445 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
446 ppi = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
448 vlan = (struct ndis_pkt_8021q_info *)((void *)ppi +
450 vlan->vlanid = skb->vlan_tci & VLAN_VID_MASK;
451 vlan->pri = (skb->vlan_tci & VLAN_PRIO_MASK) >>
455 net_trans_info = get_net_transport_info(skb, &hdr_offset);
456 if (net_trans_info == TRANSPORT_INFO_NOT_IP)
460 * Setup the sendside checksum offload only if this is not a
466 if ((skb->ip_summed == CHECKSUM_NONE) ||
467 (skb->ip_summed == CHECKSUM_UNNECESSARY))
470 rndis_msg_size += NDIS_CSUM_PPI_SIZE;
471 ppi = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
472 TCPIP_CHKSUM_PKTINFO);
474 csum_info = (struct ndis_tcp_ip_checksum_info *)((void *)ppi +
477 if (net_trans_info & (INFO_IPV4 << 16))
478 csum_info->transmit.is_ipv4 = 1;
480 csum_info->transmit.is_ipv6 = 1;
482 if (net_trans_info & INFO_TCP) {
483 csum_info->transmit.tcp_checksum = 1;
484 csum_info->transmit.tcp_header_offset = hdr_offset;
485 } else if (net_trans_info & INFO_UDP) {
486 /* UDP checksum offload is not supported on ws2008r2.
487 * Furthermore, on ws2012 and ws2012r2, there are some
488 * issues with udp checksum offload from Linux guests.
489 * (these are host issues).
490 * For now compute the checksum here.
495 ret = skb_cow_head(skb, 0);
500 udp_len = ntohs(uh->len);
502 uh->check = csum_tcpudp_magic(ip_hdr(skb)->saddr,
504 udp_len, IPPROTO_UDP,
505 csum_partial(uh, udp_len, 0));
507 uh->check = CSUM_MANGLED_0;
509 csum_info->transmit.udp_checksum = 0;
514 rndis_msg_size += NDIS_LSO_PPI_SIZE;
515 ppi = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
516 TCP_LARGESEND_PKTINFO);
518 lso_info = (struct ndis_tcp_lso_info *)((void *)ppi +
521 lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
522 if (net_trans_info & (INFO_IPV4 << 16)) {
523 lso_info->lso_v2_transmit.ip_version =
524 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
525 ip_hdr(skb)->tot_len = 0;
526 ip_hdr(skb)->check = 0;
527 tcp_hdr(skb)->check =
528 ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
529 ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
531 lso_info->lso_v2_transmit.ip_version =
532 NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
533 ipv6_hdr(skb)->payload_len = 0;
534 tcp_hdr(skb)->check =
535 ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
536 &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
538 lso_info->lso_v2_transmit.tcp_header_offset = hdr_offset;
539 lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
542 /* Start filling in the page buffers with the rndis hdr */
543 rndis_msg->msg_len += rndis_msg_size;
544 packet->total_data_buflen = rndis_msg->msg_len;
545 packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
548 ret = netvsc_send(net_device_ctx->device_ctx, packet,
549 rndis_msg, &pb, skb);
553 u64_stats_update_begin(&tx_stats->syncp);
555 tx_stats->bytes += skb_length;
556 u64_stats_update_end(&tx_stats->syncp);
558 if (ret != -EAGAIN) {
559 dev_kfree_skb_any(skb);
560 net->stats.tx_dropped++;
564 return (ret == -EAGAIN) ? NETDEV_TX_BUSY : NETDEV_TX_OK;
568 * netvsc_linkstatus_callback - Link up/down notification
570 void netvsc_linkstatus_callback(struct hv_device *device_obj,
571 struct rndis_message *resp)
573 struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
574 struct net_device *net;
575 struct net_device_context *ndev_ctx;
576 struct netvsc_device *net_device;
577 struct netvsc_reconfig *event;
580 /* Handle link change statuses only */
581 if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
582 indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
583 indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
586 net_device = hv_get_drvdata(device_obj);
587 net = net_device->ndev;
589 if (!net || net->reg_state != NETREG_REGISTERED)
592 ndev_ctx = netdev_priv(net);
594 event = kzalloc(sizeof(*event), GFP_ATOMIC);
597 event->event = indicate->status;
599 spin_lock_irqsave(&ndev_ctx->lock, flags);
600 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
601 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
603 schedule_delayed_work(&ndev_ctx->dwork, 0);
607 * netvsc_recv_callback - Callback when we receive a packet from the
608 * "wire" on the specified device.
610 int netvsc_recv_callback(struct hv_device *device_obj,
611 struct hv_netvsc_packet *packet,
613 struct ndis_tcp_ip_checksum_info *csum_info,
614 struct vmbus_channel *channel,
617 struct net_device *net;
618 struct net_device_context *net_device_ctx;
620 struct netvsc_stats *rx_stats;
622 net = ((struct netvsc_device *)hv_get_drvdata(device_obj))->ndev;
623 if (!net || net->reg_state != NETREG_REGISTERED) {
624 return NVSP_STAT_FAIL;
626 net_device_ctx = netdev_priv(net);
627 rx_stats = this_cpu_ptr(net_device_ctx->rx_stats);
629 /* Allocate a skb - TODO direct I/O to pages? */
630 skb = netdev_alloc_skb_ip_align(net, packet->total_data_buflen);
631 if (unlikely(!skb)) {
632 ++net->stats.rx_dropped;
633 return NVSP_STAT_FAIL;
637 * Copy to skb. This copy is needed here since the memory pointed by
638 * hv_netvsc_packet cannot be deallocated
640 memcpy(skb_put(skb, packet->total_data_buflen), *data,
641 packet->total_data_buflen);
643 skb->protocol = eth_type_trans(skb, net);
645 /* We only look at the IP checksum here.
646 * Should we be dropping the packet if checksum
647 * failed? How do we deal with other checksums - TCP/UDP?
649 if (csum_info->receive.ip_checksum_succeeded)
650 skb->ip_summed = CHECKSUM_UNNECESSARY;
652 skb->ip_summed = CHECKSUM_NONE;
655 if (vlan_tci & VLAN_TAG_PRESENT)
656 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
659 skb_record_rx_queue(skb, channel->
660 offermsg.offer.sub_channel_index);
662 u64_stats_update_begin(&rx_stats->syncp);
664 rx_stats->bytes += packet->total_data_buflen;
665 u64_stats_update_end(&rx_stats->syncp);
668 * Pass the skb back up. Network stack will deallocate the skb when it
677 static void netvsc_get_drvinfo(struct net_device *net,
678 struct ethtool_drvinfo *info)
680 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
681 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
684 static void netvsc_get_channels(struct net_device *net,
685 struct ethtool_channels *channel)
687 struct net_device_context *net_device_ctx = netdev_priv(net);
688 struct hv_device *dev = net_device_ctx->device_ctx;
689 struct netvsc_device *nvdev = hv_get_drvdata(dev);
692 channel->max_combined = nvdev->max_chn;
693 channel->combined_count = nvdev->num_chn;
697 static int netvsc_set_channels(struct net_device *net,
698 struct ethtool_channels *channels)
700 struct net_device_context *net_device_ctx = netdev_priv(net);
701 struct hv_device *dev = net_device_ctx->device_ctx;
702 struct netvsc_device *nvdev = hv_get_drvdata(dev);
703 struct netvsc_device_info device_info;
707 bool recovering = false;
709 if (!nvdev || nvdev->destroy)
712 num_chn = nvdev->num_chn;
713 max_chn = min_t(u32, nvdev->max_chn, num_online_cpus());
715 if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5) {
716 pr_info("vRSS unsupported before NVSP Version 5\n");
720 /* We do not support rx, tx, or other */
722 channels->rx_count ||
723 channels->tx_count ||
724 channels->other_count ||
725 (channels->combined_count < 1))
728 if (channels->combined_count > max_chn) {
729 pr_info("combined channels too high, using %d\n", max_chn);
730 channels->combined_count = max_chn;
733 ret = netvsc_close(net);
738 nvdev->start_remove = true;
739 rndis_filter_device_remove(dev);
741 nvdev->num_chn = channels->combined_count;
743 net_device_ctx->device_ctx = dev;
744 hv_set_drvdata(dev, net);
746 memset(&device_info, 0, sizeof(device_info));
747 device_info.num_chn = nvdev->num_chn; /* passed to RNDIS */
748 device_info.ring_size = ring_size;
749 device_info.max_num_vrss_chns = max_num_vrss_chns;
751 ret = rndis_filter_device_add(dev, &device_info);
754 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
760 nvdev = hv_get_drvdata(dev);
762 ret = netif_set_real_num_tx_queues(net, nvdev->num_chn);
765 netdev_err(net, "could not set tx queue count (ret %d)\n", ret);
771 ret = netif_set_real_num_rx_queues(net, nvdev->num_chn);
774 netdev_err(net, "could not set rx queue count (ret %d)\n", ret);
786 /* If the above failed, we attempt to recover through the same
787 * process but with the original number of channels.
789 netdev_err(net, "could not set channels, recovering\n");
791 channels->combined_count = num_chn;
795 static int netvsc_change_mtu(struct net_device *ndev, int mtu)
797 struct net_device_context *ndevctx = netdev_priv(ndev);
798 struct hv_device *hdev = ndevctx->device_ctx;
799 struct netvsc_device *nvdev = hv_get_drvdata(hdev);
800 struct netvsc_device_info device_info;
801 int limit = ETH_DATA_LEN;
804 if (nvdev == NULL || nvdev->destroy)
807 if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
808 limit = NETVSC_MTU - ETH_HLEN;
810 if (mtu < NETVSC_MTU_MIN || mtu > limit)
813 ret = netvsc_close(ndev);
817 nvdev->start_remove = true;
818 rndis_filter_device_remove(hdev);
822 ndevctx->device_ctx = hdev;
823 hv_set_drvdata(hdev, ndev);
825 memset(&device_info, 0, sizeof(device_info));
826 device_info.ring_size = ring_size;
827 device_info.num_chn = nvdev->num_chn;
828 device_info.max_num_vrss_chns = max_num_vrss_chns;
829 rndis_filter_device_add(hdev, &device_info);
837 static struct rtnl_link_stats64 *netvsc_get_stats64(struct net_device *net,
838 struct rtnl_link_stats64 *t)
840 struct net_device_context *ndev_ctx = netdev_priv(net);
843 for_each_possible_cpu(cpu) {
844 struct netvsc_stats *tx_stats = per_cpu_ptr(ndev_ctx->tx_stats,
846 struct netvsc_stats *rx_stats = per_cpu_ptr(ndev_ctx->rx_stats,
848 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
852 start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
853 tx_packets = tx_stats->packets;
854 tx_bytes = tx_stats->bytes;
855 } while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
858 start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
859 rx_packets = rx_stats->packets;
860 rx_bytes = rx_stats->bytes;
861 } while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
863 t->tx_bytes += tx_bytes;
864 t->tx_packets += tx_packets;
865 t->rx_bytes += rx_bytes;
866 t->rx_packets += rx_packets;
869 t->tx_dropped = net->stats.tx_dropped;
870 t->tx_errors = net->stats.tx_dropped;
872 t->rx_dropped = net->stats.rx_dropped;
873 t->rx_errors = net->stats.rx_errors;
878 static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
880 struct net_device_context *ndevctx = netdev_priv(ndev);
881 struct hv_device *hdev = ndevctx->device_ctx;
882 struct sockaddr *addr = p;
883 char save_adr[ETH_ALEN];
884 unsigned char save_aatype;
887 memcpy(save_adr, ndev->dev_addr, ETH_ALEN);
888 save_aatype = ndev->addr_assign_type;
890 err = eth_mac_addr(ndev, p);
894 err = rndis_filter_set_device_mac(hdev, addr->sa_data);
896 /* roll back to saved MAC */
897 memcpy(ndev->dev_addr, save_adr, ETH_ALEN);
898 ndev->addr_assign_type = save_aatype;
904 #ifdef CONFIG_NET_POLL_CONTROLLER
905 static void netvsc_poll_controller(struct net_device *net)
907 /* As netvsc_start_xmit() works synchronous we don't have to
908 * trigger anything here.
913 static const struct ethtool_ops ethtool_ops = {
914 .get_drvinfo = netvsc_get_drvinfo,
915 .get_link = ethtool_op_get_link,
916 .get_channels = netvsc_get_channels,
917 .set_channels = netvsc_set_channels,
920 static const struct net_device_ops device_ops = {
921 .ndo_open = netvsc_open,
922 .ndo_stop = netvsc_close,
923 .ndo_start_xmit = netvsc_start_xmit,
924 .ndo_set_rx_mode = netvsc_set_multicast_list,
925 .ndo_change_mtu = netvsc_change_mtu,
926 .ndo_validate_addr = eth_validate_addr,
927 .ndo_set_mac_address = netvsc_set_mac_addr,
928 .ndo_select_queue = netvsc_select_queue,
929 .ndo_get_stats64 = netvsc_get_stats64,
930 #ifdef CONFIG_NET_POLL_CONTROLLER
931 .ndo_poll_controller = netvsc_poll_controller,
936 * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
937 * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
938 * present send GARP packet to network peers with netif_notify_peers().
940 static void netvsc_link_change(struct work_struct *w)
942 struct net_device_context *ndev_ctx;
943 struct net_device *net;
944 struct netvsc_device *net_device;
945 struct rndis_device *rdev;
946 struct netvsc_reconfig *event = NULL;
947 bool notify = false, reschedule = false;
948 unsigned long flags, next_reconfig, delay;
950 ndev_ctx = container_of(w, struct net_device_context, dwork.work);
951 net_device = hv_get_drvdata(ndev_ctx->device_ctx);
952 rdev = net_device->extension;
953 net = net_device->ndev;
955 next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
956 if (time_is_after_jiffies(next_reconfig)) {
957 /* link_watch only sends one notification with current state
958 * per second, avoid doing reconfig more frequently. Handle
961 delay = next_reconfig - jiffies;
962 delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
963 schedule_delayed_work(&ndev_ctx->dwork, delay);
966 ndev_ctx->last_reconfig = jiffies;
968 spin_lock_irqsave(&ndev_ctx->lock, flags);
969 if (!list_empty(&ndev_ctx->reconfig_events)) {
970 event = list_first_entry(&ndev_ctx->reconfig_events,
971 struct netvsc_reconfig, list);
972 list_del(&event->list);
973 reschedule = !list_empty(&ndev_ctx->reconfig_events);
975 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
982 switch (event->event) {
983 /* Only the following events are possible due to the check in
984 * netvsc_linkstatus_callback()
986 case RNDIS_STATUS_MEDIA_CONNECT:
987 if (rdev->link_state) {
988 rdev->link_state = false;
989 netif_carrier_on(net);
990 netif_tx_wake_all_queues(net);
996 case RNDIS_STATUS_MEDIA_DISCONNECT:
997 if (!rdev->link_state) {
998 rdev->link_state = true;
999 netif_carrier_off(net);
1000 netif_tx_stop_all_queues(net);
1004 case RNDIS_STATUS_NETWORK_CHANGE:
1005 /* Only makes sense if carrier is present */
1006 if (!rdev->link_state) {
1007 rdev->link_state = true;
1008 netif_carrier_off(net);
1009 netif_tx_stop_all_queues(net);
1010 event->event = RNDIS_STATUS_MEDIA_CONNECT;
1011 spin_lock_irqsave(&ndev_ctx->lock, flags);
1012 list_add_tail(&event->list, &ndev_ctx->reconfig_events);
1013 spin_unlock_irqrestore(&ndev_ctx->lock, flags);
1022 netdev_notify_peers(net);
1024 /* link_watch only sends one notification with current state per
1025 * second, handle next reconfig event in 2 seconds.
1028 schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
1031 static void netvsc_free_netdev(struct net_device *netdev)
1033 struct net_device_context *net_device_ctx = netdev_priv(netdev);
1035 free_percpu(net_device_ctx->tx_stats);
1036 free_percpu(net_device_ctx->rx_stats);
1037 free_netdev(netdev);
1040 static int netvsc_probe(struct hv_device *dev,
1041 const struct hv_vmbus_device_id *dev_id)
1043 struct net_device *net = NULL;
1044 struct net_device_context *net_device_ctx;
1045 struct netvsc_device_info device_info;
1046 struct netvsc_device *nvdev;
1049 net = alloc_etherdev_mq(sizeof(struct net_device_context),
1054 netif_carrier_off(net);
1056 net_device_ctx = netdev_priv(net);
1057 net_device_ctx->device_ctx = dev;
1058 net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
1059 if (netif_msg_probe(net_device_ctx))
1060 netdev_dbg(net, "netvsc msg_enable: %d\n",
1061 net_device_ctx->msg_enable);
1063 net_device_ctx->tx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1064 if (!net_device_ctx->tx_stats) {
1068 net_device_ctx->rx_stats = netdev_alloc_pcpu_stats(struct netvsc_stats);
1069 if (!net_device_ctx->rx_stats) {
1070 free_percpu(net_device_ctx->tx_stats);
1075 hv_set_drvdata(dev, net);
1076 INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
1077 INIT_WORK(&net_device_ctx->work, do_set_multicast);
1079 spin_lock_init(&net_device_ctx->lock);
1080 INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
1082 net->netdev_ops = &device_ops;
1084 net->hw_features = NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_IP_CSUM |
1086 net->features = NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_SG | NETIF_F_RXCSUM |
1087 NETIF_F_IP_CSUM | NETIF_F_TSO;
1089 net->ethtool_ops = ðtool_ops;
1090 SET_NETDEV_DEV(net, &dev->device);
1092 /* Notify the netvsc driver of the new device */
1093 memset(&device_info, 0, sizeof(device_info));
1094 device_info.ring_size = ring_size;
1095 device_info.max_num_vrss_chns = max_num_vrss_chns;
1096 ret = rndis_filter_device_add(dev, &device_info);
1098 netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
1099 netvsc_free_netdev(net);
1100 hv_set_drvdata(dev, NULL);
1103 memcpy(net->dev_addr, device_info.mac_adr, ETH_ALEN);
1105 nvdev = hv_get_drvdata(dev);
1106 netif_set_real_num_tx_queues(net, nvdev->num_chn);
1107 netif_set_real_num_rx_queues(net, nvdev->num_chn);
1109 ret = register_netdev(net);
1111 pr_err("Unable to register netdev.\n");
1112 rndis_filter_device_remove(dev);
1113 netvsc_free_netdev(net);
1119 static int netvsc_remove(struct hv_device *dev)
1121 struct net_device *net;
1122 struct net_device_context *ndev_ctx;
1123 struct netvsc_device *net_device;
1125 net_device = hv_get_drvdata(dev);
1126 net = net_device->ndev;
1129 dev_err(&dev->device, "No net device to remove\n");
1133 net_device->start_remove = true;
1135 ndev_ctx = netdev_priv(net);
1136 cancel_delayed_work_sync(&ndev_ctx->dwork);
1137 cancel_work_sync(&ndev_ctx->work);
1139 /* Stop outbound asap */
1140 netif_tx_disable(net);
1142 unregister_netdev(net);
1145 * Call to the vsc driver to let it know that the device is being
1148 rndis_filter_device_remove(dev);
1150 netvsc_free_netdev(net);
1154 static const struct hv_vmbus_device_id id_table[] = {
1160 MODULE_DEVICE_TABLE(vmbus, id_table);
1162 /* The one and only one */
1163 static struct hv_driver netvsc_drv = {
1164 .name = KBUILD_MODNAME,
1165 .id_table = id_table,
1166 .probe = netvsc_probe,
1167 .remove = netvsc_remove,
1170 static void __exit netvsc_drv_exit(void)
1172 vmbus_driver_unregister(&netvsc_drv);
1175 static int __init netvsc_drv_init(void)
1177 if (ring_size < RING_SIZE_MIN) {
1178 ring_size = RING_SIZE_MIN;
1179 pr_info("Increased ring_size to %d (min allowed)\n",
1182 return vmbus_driver_register(&netvsc_drv);
1185 MODULE_LICENSE("GPL");
1186 MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
1188 module_init(netvsc_drv_init);
1189 module_exit(netvsc_drv_exit);