1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* A network driver using virtio.
4 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
7 #include <linux/netdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/ethtool.h>
10 #include <linux/module.h>
11 #include <linux/virtio.h>
12 #include <linux/virtio_net.h>
13 #include <linux/bpf.h>
14 #include <linux/bpf_trace.h>
15 #include <linux/scatterlist.h>
16 #include <linux/if_vlan.h>
17 #include <linux/slab.h>
18 #include <linux/cpu.h>
19 #include <linux/average.h>
20 #include <linux/filter.h>
21 #include <linux/kernel.h>
22 #include <net/route.h>
24 #include <net/net_failover.h>
26 static int napi_weight = NAPI_POLL_WEIGHT;
27 module_param(napi_weight, int, 0444);
29 static bool csum = true, gso = true, napi_tx = true;
30 module_param(csum, bool, 0444);
31 module_param(gso, bool, 0444);
32 module_param(napi_tx, bool, 0644);
34 /* FIXME: MTU in config. */
35 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
36 #define GOOD_COPY_LEN 128
38 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
40 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
41 #define VIRTIO_XDP_HEADROOM 256
43 /* Separating two types of XDP xmit */
44 #define VIRTIO_XDP_TX BIT(0)
45 #define VIRTIO_XDP_REDIR BIT(1)
47 #define VIRTIO_XDP_FLAG BIT(0)
49 /* RX packet size EWMA. The average packet size is used to determine the packet
50 * buffer size when refilling RX rings. As the entire RX ring may be refilled
51 * at once, the weight is chosen so that the EWMA will be insensitive to short-
52 * term, transient changes in packet size.
54 DECLARE_EWMA(pkt_len, 0, 64)
56 #define VIRTNET_DRIVER_VERSION "1.0.0"
58 static const unsigned long guest_offloads[] = {
59 VIRTIO_NET_F_GUEST_TSO4,
60 VIRTIO_NET_F_GUEST_TSO6,
61 VIRTIO_NET_F_GUEST_ECN,
62 VIRTIO_NET_F_GUEST_UFO,
63 VIRTIO_NET_F_GUEST_CSUM
66 #define GUEST_OFFLOAD_LRO_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
67 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
68 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
69 (1ULL << VIRTIO_NET_F_GUEST_UFO))
71 #define GUEST_OFFLOAD_CSUM_MASK (1ULL << VIRTIO_NET_F_GUEST_CSUM)
73 struct virtnet_stat_desc {
74 char desc[ETH_GSTRING_LEN];
78 struct virtnet_sq_stats {
79 struct u64_stats_sync syncp;
87 struct virtnet_rq_stats {
88 struct u64_stats_sync syncp;
99 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
100 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
102 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
103 { "packets", VIRTNET_SQ_STAT(packets) },
104 { "bytes", VIRTNET_SQ_STAT(bytes) },
105 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
106 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
107 { "kicks", VIRTNET_SQ_STAT(kicks) },
110 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
111 { "packets", VIRTNET_RQ_STAT(packets) },
112 { "bytes", VIRTNET_RQ_STAT(bytes) },
113 { "drops", VIRTNET_RQ_STAT(drops) },
114 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
115 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
116 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
117 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
118 { "kicks", VIRTNET_RQ_STAT(kicks) },
121 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
122 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
124 /* Internal representation of a send virtqueue */
126 /* Virtqueue associated with this send _queue */
127 struct virtqueue *vq;
129 /* TX: fragments + linear part + virtio header */
130 struct scatterlist sg[MAX_SKB_FRAGS + 2];
132 /* Name of the send queue: output.$index */
135 struct virtnet_sq_stats stats;
137 struct napi_struct napi;
140 /* Internal representation of a receive virtqueue */
141 struct receive_queue {
142 /* Virtqueue associated with this receive_queue */
143 struct virtqueue *vq;
145 struct napi_struct napi;
147 struct bpf_prog __rcu *xdp_prog;
149 struct virtnet_rq_stats stats;
151 /* Chain pages by the private ptr. */
154 /* Average packet length for mergeable receive buffers. */
155 struct ewma_pkt_len mrg_avg_pkt_len;
157 /* Page frag for packet buffer allocation. */
158 struct page_frag alloc_frag;
160 /* RX: fragments + linear part + virtio header */
161 struct scatterlist sg[MAX_SKB_FRAGS + 2];
163 /* Min single buffer size for mergeable buffers case. */
164 unsigned int min_buf_len;
166 /* Name of this receive queue: input.$index */
169 struct xdp_rxq_info xdp_rxq;
172 /* Control VQ buffers: protected by the rtnl lock */
174 struct virtio_net_ctrl_hdr hdr;
175 virtio_net_ctrl_ack status;
176 struct virtio_net_ctrl_mq mq;
183 struct virtnet_info {
184 struct virtio_device *vdev;
185 struct virtqueue *cvq;
186 struct net_device *dev;
187 struct send_queue *sq;
188 struct receive_queue *rq;
191 /* Max # of queue pairs supported by the device */
194 /* # of queue pairs currently used by the driver */
195 u16 curr_queue_pairs;
197 /* # of XDP queue pairs currently used by the driver */
200 /* I like... big packets and I cannot lie! */
203 /* Host will merge rx buffers for big packets (shake it! shake it!) */
204 bool mergeable_rx_bufs;
206 /* Has control virtqueue */
209 /* Host can handle any s/g split between our header and packet data */
212 /* Packet virtio header size */
215 /* Work struct for refilling if we run low on memory. */
216 struct delayed_work refill;
218 /* Work struct for config space updates */
219 struct work_struct config_work;
221 /* Does the affinity hint is set for virtqueues? */
222 bool affinity_hint_set;
224 /* CPU hotplug instances for online & dead */
225 struct hlist_node node;
226 struct hlist_node node_dead;
228 struct control_buf *ctrl;
230 /* Ethtool settings */
234 unsigned long guest_offloads;
235 unsigned long guest_offloads_capable;
237 /* failover when STANDBY feature enabled */
238 struct failover *failover;
241 struct padded_vnet_hdr {
242 struct virtio_net_hdr_mrg_rxbuf hdr;
244 * hdr is in a separate sg buffer, and data sg buffer shares same page
245 * with this header sg. This padding makes next sg 16 byte aligned
251 static bool is_xdp_frame(void *ptr)
253 return (unsigned long)ptr & VIRTIO_XDP_FLAG;
256 static void *xdp_to_ptr(struct xdp_frame *ptr)
258 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
261 static struct xdp_frame *ptr_to_xdp(void *ptr)
263 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
266 /* Converting between virtqueue no. and kernel tx/rx queue no.
267 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
269 static int vq2txq(struct virtqueue *vq)
271 return (vq->index - 1) / 2;
274 static int txq2vq(int txq)
279 static int vq2rxq(struct virtqueue *vq)
281 return vq->index / 2;
284 static int rxq2vq(int rxq)
289 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
291 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
295 * private is used to chain pages for big packets, put the whole
296 * most recent used list in the beginning for reuse
298 static void give_pages(struct receive_queue *rq, struct page *page)
302 /* Find end of list, sew whole thing into vi->rq.pages. */
303 for (end = page; end->private; end = (struct page *)end->private);
304 end->private = (unsigned long)rq->pages;
308 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
310 struct page *p = rq->pages;
313 rq->pages = (struct page *)p->private;
314 /* clear private here, it is used to chain pages */
317 p = alloc_page(gfp_mask);
321 static void virtqueue_napi_schedule(struct napi_struct *napi,
322 struct virtqueue *vq)
324 if (napi_schedule_prep(napi)) {
325 virtqueue_disable_cb(vq);
326 __napi_schedule(napi);
330 static void virtqueue_napi_complete(struct napi_struct *napi,
331 struct virtqueue *vq, int processed)
335 opaque = virtqueue_enable_cb_prepare(vq);
336 if (napi_complete_done(napi, processed)) {
337 if (unlikely(virtqueue_poll(vq, opaque)))
338 virtqueue_napi_schedule(napi, vq);
340 virtqueue_disable_cb(vq);
344 static void skb_xmit_done(struct virtqueue *vq)
346 struct virtnet_info *vi = vq->vdev->priv;
347 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
349 /* Suppress further interrupts. */
350 virtqueue_disable_cb(vq);
353 virtqueue_napi_schedule(napi, vq);
355 /* We were probably waiting for more output buffers. */
356 netif_wake_subqueue(vi->dev, vq2txq(vq));
359 #define MRG_CTX_HEADER_SHIFT 22
360 static void *mergeable_len_to_ctx(unsigned int truesize,
361 unsigned int headroom)
363 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
366 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
368 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
371 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
373 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
376 /* Called from bottom half context */
377 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
378 struct receive_queue *rq,
379 struct page *page, unsigned int offset,
380 unsigned int len, unsigned int truesize,
381 bool hdr_valid, unsigned int metasize)
384 struct virtio_net_hdr_mrg_rxbuf *hdr;
385 unsigned int copy, hdr_len, hdr_padded_len;
388 p = page_address(page) + offset;
390 /* copy small packet so we can reuse these pages for small data */
391 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
395 hdr = skb_vnet_hdr(skb);
397 hdr_len = vi->hdr_len;
398 if (vi->mergeable_rx_bufs)
399 hdr_padded_len = sizeof(*hdr);
401 hdr_padded_len = sizeof(struct padded_vnet_hdr);
403 /* hdr_valid means no XDP, so we can copy the vnet header */
405 memcpy(hdr, p, hdr_len);
408 offset += hdr_padded_len;
412 if (copy > skb_tailroom(skb))
413 copy = skb_tailroom(skb);
414 skb_put_data(skb, p, copy);
417 __skb_pull(skb, metasize);
418 skb_metadata_set(skb, metasize);
424 if (vi->mergeable_rx_bufs) {
426 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
433 * Verify that we can indeed put this data into a skb.
434 * This is here to handle cases when the device erroneously
435 * tries to receive more than is possible. This is usually
436 * the case of a broken device.
438 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
439 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
443 BUG_ON(offset >= PAGE_SIZE);
445 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
446 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
447 frag_size, truesize);
449 page = (struct page *)page->private;
454 give_pages(rq, page);
459 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
460 struct send_queue *sq,
461 struct xdp_frame *xdpf)
463 struct virtio_net_hdr_mrg_rxbuf *hdr;
466 if (unlikely(xdpf->headroom < vi->hdr_len))
469 /* Make room for virtqueue hdr (also change xdpf->headroom?) */
470 xdpf->data -= vi->hdr_len;
471 /* Zero header and leave csum up to XDP layers */
473 memset(hdr, 0, vi->hdr_len);
474 xdpf->len += vi->hdr_len;
476 sg_init_one(sq->sg, xdpf->data, xdpf->len);
478 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf),
481 return -ENOSPC; /* Caller handle free/refcnt */
486 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi)
490 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
494 static int virtnet_xdp_xmit(struct net_device *dev,
495 int n, struct xdp_frame **frames, u32 flags)
497 struct virtnet_info *vi = netdev_priv(dev);
498 struct receive_queue *rq = vi->rq;
499 struct bpf_prog *xdp_prog;
500 struct send_queue *sq;
510 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
511 * indicate XDP resources have been successfully allocated.
513 xdp_prog = rcu_access_pointer(rq->xdp_prog);
517 sq = virtnet_xdp_sq(vi);
519 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
525 /* Free up any pending old buffers before queueing new ones. */
526 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
527 if (likely(is_xdp_frame(ptr))) {
528 struct xdp_frame *frame = ptr_to_xdp(ptr);
531 xdp_return_frame(frame);
533 struct sk_buff *skb = ptr;
536 napi_consume_skb(skb, false);
541 for (i = 0; i < n; i++) {
542 struct xdp_frame *xdpf = frames[i];
544 err = __virtnet_xdp_xmit_one(vi, sq, xdpf);
546 xdp_return_frame_rx_napi(xdpf);
552 if (flags & XDP_XMIT_FLUSH) {
553 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
557 u64_stats_update_begin(&sq->stats.syncp);
558 sq->stats.bytes += bytes;
559 sq->stats.packets += packets;
560 sq->stats.xdp_tx += n;
561 sq->stats.xdp_tx_drops += drops;
562 sq->stats.kicks += kicks;
563 u64_stats_update_end(&sq->stats.syncp);
568 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
570 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0;
573 /* We copy the packet for XDP in the following cases:
575 * 1) Packet is scattered across multiple rx buffers.
576 * 2) Headroom space is insufficient.
578 * This is inefficient but it's a temporary condition that
579 * we hit right after XDP is enabled and until queue is refilled
580 * with large buffers with sufficient headroom - so it should affect
581 * at most queue size packets.
582 * Afterwards, the conditions to enable
583 * XDP should preclude the underlying device from sending packets
584 * across multiple buffers (num_buf > 1), and we make sure buffers
585 * have enough headroom.
587 static struct page *xdp_linearize_page(struct receive_queue *rq,
594 struct page *page = alloc_page(GFP_ATOMIC);
599 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
603 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
608 buf = virtqueue_get_buf(rq->vq, &buflen);
612 p = virt_to_head_page(buf);
613 off = buf - page_address(p);
615 /* guard against a misconfigured or uncooperative backend that
616 * is sending packet larger than the MTU.
618 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
623 memcpy(page_address(page) + page_off,
624 page_address(p) + off, buflen);
629 /* Headroom does not contribute to packet length */
630 *len = page_off - VIRTIO_XDP_HEADROOM;
633 __free_pages(page, 0);
637 static struct sk_buff *receive_small(struct net_device *dev,
638 struct virtnet_info *vi,
639 struct receive_queue *rq,
640 void *buf, void *ctx,
642 unsigned int *xdp_xmit,
643 struct virtnet_rq_stats *stats)
646 struct bpf_prog *xdp_prog;
647 unsigned int xdp_headroom = (unsigned long)ctx;
648 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
649 unsigned int headroom = vi->hdr_len + header_offset;
650 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
651 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
652 struct page *page = virt_to_head_page(buf);
653 unsigned int delta = 0;
654 struct page *xdp_page;
656 unsigned int metasize = 0;
662 xdp_prog = rcu_dereference(rq->xdp_prog);
664 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
665 struct xdp_frame *xdpf;
670 if (unlikely(hdr->hdr.gso_type))
673 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
674 int offset = buf - page_address(page) + header_offset;
675 unsigned int tlen = len + vi->hdr_len;
678 xdp_headroom = virtnet_get_headroom(vi);
679 header_offset = VIRTNET_RX_PAD + xdp_headroom;
680 headroom = vi->hdr_len + header_offset;
681 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
682 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
683 xdp_page = xdp_linearize_page(rq, &num_buf, page,
684 offset, header_offset,
689 buf = page_address(xdp_page);
694 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
695 xdp.data = xdp.data_hard_start + xdp_headroom;
696 xdp.data_end = xdp.data + len;
697 xdp.data_meta = xdp.data;
698 xdp.rxq = &rq->xdp_rxq;
699 xdp.frame_sz = buflen;
700 orig_data = xdp.data;
701 act = bpf_prog_run_xdp(xdp_prog, &xdp);
702 stats->xdp_packets++;
706 /* Recalculate length in case bpf program changed it */
707 delta = orig_data - xdp.data;
708 len = xdp.data_end - xdp.data;
709 metasize = xdp.data - xdp.data_meta;
713 xdpf = xdp_convert_buff_to_frame(&xdp);
716 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
717 if (unlikely(err < 0)) {
718 trace_xdp_exception(vi->dev, xdp_prog, act);
721 *xdp_xmit |= VIRTIO_XDP_TX;
725 stats->xdp_redirects++;
726 err = xdp_do_redirect(dev, &xdp, xdp_prog);
729 *xdp_xmit |= VIRTIO_XDP_REDIR;
733 bpf_warn_invalid_xdp_action(act);
736 trace_xdp_exception(vi->dev, xdp_prog, act);
743 skb = build_skb(buf, buflen);
748 skb_reserve(skb, headroom - delta);
751 buf += header_offset;
752 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
753 } /* keep zeroed vnet hdr since XDP is loaded */
756 skb_metadata_set(skb, metasize);
770 static struct sk_buff *receive_big(struct net_device *dev,
771 struct virtnet_info *vi,
772 struct receive_queue *rq,
775 struct virtnet_rq_stats *stats)
777 struct page *page = buf;
778 struct sk_buff *skb =
779 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0);
781 stats->bytes += len - vi->hdr_len;
789 give_pages(rq, page);
793 static struct sk_buff *receive_mergeable(struct net_device *dev,
794 struct virtnet_info *vi,
795 struct receive_queue *rq,
799 unsigned int *xdp_xmit,
800 struct virtnet_rq_stats *stats)
802 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
803 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
804 struct page *page = virt_to_head_page(buf);
805 int offset = buf - page_address(page);
806 struct sk_buff *head_skb, *curr_skb;
807 struct bpf_prog *xdp_prog;
808 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
809 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
810 unsigned int metasize = 0;
811 unsigned int frame_sz;
815 stats->bytes += len - vi->hdr_len;
818 xdp_prog = rcu_dereference(rq->xdp_prog);
820 struct xdp_frame *xdpf;
821 struct page *xdp_page;
826 /* Transient failure which in theory could occur if
827 * in-flight packets from before XDP was enabled reach
828 * the receive path after XDP is loaded.
830 if (unlikely(hdr->hdr.gso_type))
833 /* Buffers with headroom use PAGE_SIZE as alloc size,
834 * see add_recvbuf_mergeable() + get_mergeable_buf_len()
836 frame_sz = headroom ? PAGE_SIZE : truesize;
838 /* This happens when rx buffer size is underestimated
839 * or headroom is not enough because of the buffer
840 * was refilled before XDP is set. This should only
841 * happen for the first several packets, so we don't
842 * care much about its performance.
844 if (unlikely(num_buf > 1 ||
845 headroom < virtnet_get_headroom(vi))) {
846 /* linearize data for XDP */
847 xdp_page = xdp_linearize_page(rq, &num_buf,
851 frame_sz = PAGE_SIZE;
855 offset = VIRTIO_XDP_HEADROOM;
860 /* Allow consuming headroom but reserve enough space to push
861 * the descriptor on if we get an XDP_TX return code.
863 data = page_address(xdp_page) + offset;
864 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
865 xdp.data = data + vi->hdr_len;
866 xdp.data_end = xdp.data + (len - vi->hdr_len);
867 xdp.data_meta = xdp.data;
868 xdp.rxq = &rq->xdp_rxq;
869 xdp.frame_sz = frame_sz - vi->hdr_len;
871 act = bpf_prog_run_xdp(xdp_prog, &xdp);
872 stats->xdp_packets++;
876 metasize = xdp.data - xdp.data_meta;
878 /* recalculate offset to account for any header
879 * adjustments and minus the metasize to copy the
880 * metadata in page_to_skb(). Note other cases do not
881 * build an skb and avoid using offset
883 offset = xdp.data - page_address(xdp_page) -
884 vi->hdr_len - metasize;
886 /* recalculate len if xdp.data, xdp.data_end or
887 * xdp.data_meta were adjusted
889 len = xdp.data_end - xdp.data + vi->hdr_len + metasize;
890 /* We can only create skb based on xdp_page. */
891 if (unlikely(xdp_page != page)) {
894 head_skb = page_to_skb(vi, rq, xdp_page, offset,
895 len, PAGE_SIZE, false,
902 xdpf = xdp_convert_buff_to_frame(&xdp);
905 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
906 if (unlikely(err < 0)) {
907 trace_xdp_exception(vi->dev, xdp_prog, act);
908 if (unlikely(xdp_page != page))
912 *xdp_xmit |= VIRTIO_XDP_TX;
913 if (unlikely(xdp_page != page))
918 stats->xdp_redirects++;
919 err = xdp_do_redirect(dev, &xdp, xdp_prog);
921 if (unlikely(xdp_page != page))
925 *xdp_xmit |= VIRTIO_XDP_REDIR;
926 if (unlikely(xdp_page != page))
931 bpf_warn_invalid_xdp_action(act);
934 trace_xdp_exception(vi->dev, xdp_prog, act);
937 if (unlikely(xdp_page != page))
938 __free_pages(xdp_page, 0);
944 if (unlikely(len > truesize)) {
945 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
946 dev->name, len, (unsigned long)ctx);
947 dev->stats.rx_length_errors++;
951 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
955 if (unlikely(!curr_skb))
960 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
961 if (unlikely(!buf)) {
962 pr_debug("%s: rx error: %d buffers out of %d missing\n",
964 virtio16_to_cpu(vi->vdev,
966 dev->stats.rx_length_errors++;
971 page = virt_to_head_page(buf);
973 truesize = mergeable_ctx_to_truesize(ctx);
974 if (unlikely(len > truesize)) {
975 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
976 dev->name, len, (unsigned long)ctx);
977 dev->stats.rx_length_errors++;
981 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
982 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
983 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
987 if (curr_skb == head_skb)
988 skb_shinfo(curr_skb)->frag_list = nskb;
990 curr_skb->next = nskb;
992 head_skb->truesize += nskb->truesize;
995 if (curr_skb != head_skb) {
996 head_skb->data_len += len;
997 head_skb->len += len;
998 head_skb->truesize += truesize;
1000 offset = buf - page_address(page);
1001 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
1003 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
1006 skb_add_rx_frag(curr_skb, num_skb_frags, page,
1007 offset, len, truesize);
1011 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
1019 while (num_buf-- > 1) {
1020 buf = virtqueue_get_buf(rq->vq, &len);
1021 if (unlikely(!buf)) {
1022 pr_debug("%s: rx error: %d buffers missing\n",
1023 dev->name, num_buf);
1024 dev->stats.rx_length_errors++;
1027 stats->bytes += len;
1028 page = virt_to_head_page(buf);
1033 dev_kfree_skb(head_skb);
1038 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
1039 void *buf, unsigned int len, void **ctx,
1040 unsigned int *xdp_xmit,
1041 struct virtnet_rq_stats *stats)
1043 struct net_device *dev = vi->dev;
1044 struct sk_buff *skb;
1045 struct virtio_net_hdr_mrg_rxbuf *hdr;
1047 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
1048 pr_debug("%s: short packet %i\n", dev->name, len);
1049 dev->stats.rx_length_errors++;
1050 if (vi->mergeable_rx_bufs) {
1051 put_page(virt_to_head_page(buf));
1052 } else if (vi->big_packets) {
1053 give_pages(rq, buf);
1055 put_page(virt_to_head_page(buf));
1060 if (vi->mergeable_rx_bufs)
1061 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1063 else if (vi->big_packets)
1064 skb = receive_big(dev, vi, rq, buf, len, stats);
1066 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1071 hdr = skb_vnet_hdr(skb);
1073 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1074 skb->ip_summed = CHECKSUM_UNNECESSARY;
1076 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1077 virtio_is_little_endian(vi->vdev))) {
1078 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1079 dev->name, hdr->hdr.gso_type,
1084 skb_record_rx_queue(skb, vq2rxq(rq->vq));
1085 skb->protocol = eth_type_trans(skb, dev);
1086 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1087 ntohs(skb->protocol), skb->len, skb->pkt_type);
1089 napi_gro_receive(&rq->napi, skb);
1093 dev->stats.rx_frame_errors++;
1097 /* Unlike mergeable buffers, all buffers are allocated to the
1098 * same size, except for the headroom. For this reason we do
1099 * not need to use mergeable_len_to_ctx here - it is enough
1100 * to store the headroom as the context ignoring the truesize.
1102 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1105 struct page_frag *alloc_frag = &rq->alloc_frag;
1107 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1108 void *ctx = (void *)(unsigned long)xdp_headroom;
1109 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1112 len = SKB_DATA_ALIGN(len) +
1113 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1114 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1117 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1118 get_page(alloc_frag->page);
1119 alloc_frag->offset += len;
1120 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1121 vi->hdr_len + GOOD_PACKET_LEN);
1122 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1124 put_page(virt_to_head_page(buf));
1128 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1131 struct page *first, *list = NULL;
1135 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1137 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
1138 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1139 first = get_a_page(rq, gfp);
1142 give_pages(rq, list);
1145 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1147 /* chain new page in list head to match sg */
1148 first->private = (unsigned long)list;
1152 first = get_a_page(rq, gfp);
1154 give_pages(rq, list);
1157 p = page_address(first);
1159 /* rq->sg[0], rq->sg[1] share the same page */
1160 /* a separated rq->sg[0] for header - required in case !any_header_sg */
1161 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1163 /* rq->sg[1] for data packet, from offset */
1164 offset = sizeof(struct padded_vnet_hdr);
1165 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1167 /* chain first in list head */
1168 first->private = (unsigned long)list;
1169 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1172 give_pages(rq, first);
1177 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1178 struct ewma_pkt_len *avg_pkt_len,
1181 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1185 return PAGE_SIZE - room;
1187 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1188 rq->min_buf_len, PAGE_SIZE - hdr_len);
1190 return ALIGN(len, L1_CACHE_BYTES);
1193 static int add_recvbuf_mergeable(struct virtnet_info *vi,
1194 struct receive_queue *rq, gfp_t gfp)
1196 struct page_frag *alloc_frag = &rq->alloc_frag;
1197 unsigned int headroom = virtnet_get_headroom(vi);
1198 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1199 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1203 unsigned int len, hole;
1205 /* Extra tailroom is needed to satisfy XDP's assumption. This
1206 * means rx frags coalescing won't work, but consider we've
1207 * disabled GSO for XDP, it won't be a big issue.
1209 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1210 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1213 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1214 buf += headroom; /* advance address leaving hole at front of pkt */
1215 get_page(alloc_frag->page);
1216 alloc_frag->offset += len + room;
1217 hole = alloc_frag->size - alloc_frag->offset;
1218 if (hole < len + room) {
1219 /* To avoid internal fragmentation, if there is very likely not
1220 * enough space for another buffer, add the remaining space to
1221 * the current buffer.
1224 alloc_frag->offset += hole;
1227 sg_init_one(rq->sg, buf, len);
1228 ctx = mergeable_len_to_ctx(len, headroom);
1229 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1231 put_page(virt_to_head_page(buf));
1237 * Returns false if we couldn't fill entirely (OOM).
1239 * Normally run in the receive path, but can also be run from ndo_open
1240 * before we're receiving packets, or from refill_work which is
1241 * careful to disable receiving (using napi_disable).
1243 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1250 if (vi->mergeable_rx_bufs)
1251 err = add_recvbuf_mergeable(vi, rq, gfp);
1252 else if (vi->big_packets)
1253 err = add_recvbuf_big(vi, rq, gfp);
1255 err = add_recvbuf_small(vi, rq, gfp);
1257 oom = err == -ENOMEM;
1260 } while (rq->vq->num_free);
1261 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
1262 unsigned long flags;
1264 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
1266 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
1272 static void skb_recv_done(struct virtqueue *rvq)
1274 struct virtnet_info *vi = rvq->vdev->priv;
1275 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1277 virtqueue_napi_schedule(&rq->napi, rvq);
1280 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1284 /* If all buffers were filled by other side before we napi_enabled, we
1285 * won't get another interrupt, so process any outstanding packets now.
1286 * Call local_bh_enable after to trigger softIRQ processing.
1289 virtqueue_napi_schedule(napi, vq);
1293 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1294 struct virtqueue *vq,
1295 struct napi_struct *napi)
1300 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
1301 * enable the feature if this is likely affine with the transmit path.
1303 if (!vi->affinity_hint_set) {
1308 return virtnet_napi_enable(vq, napi);
1311 static void virtnet_napi_tx_disable(struct napi_struct *napi)
1317 static void refill_work(struct work_struct *work)
1319 struct virtnet_info *vi =
1320 container_of(work, struct virtnet_info, refill.work);
1324 for (i = 0; i < vi->curr_queue_pairs; i++) {
1325 struct receive_queue *rq = &vi->rq[i];
1327 napi_disable(&rq->napi);
1328 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1329 virtnet_napi_enable(rq->vq, &rq->napi);
1331 /* In theory, this can happen: if we don't get any buffers in
1332 * we will *never* try to fill again.
1335 schedule_delayed_work(&vi->refill, HZ/2);
1339 static int virtnet_receive(struct receive_queue *rq, int budget,
1340 unsigned int *xdp_xmit)
1342 struct virtnet_info *vi = rq->vq->vdev->priv;
1343 struct virtnet_rq_stats stats = {};
1348 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1351 while (stats.packets < budget &&
1352 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1353 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
1357 while (stats.packets < budget &&
1358 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1359 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
1364 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
1365 if (!try_fill_recv(vi, rq, GFP_ATOMIC))
1366 schedule_delayed_work(&vi->refill, 0);
1369 u64_stats_update_begin(&rq->stats.syncp);
1370 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
1371 size_t offset = virtnet_rq_stats_desc[i].offset;
1374 item = (u64 *)((u8 *)&rq->stats + offset);
1375 *item += *(u64 *)((u8 *)&stats + offset);
1377 u64_stats_update_end(&rq->stats.syncp);
1379 return stats.packets;
1382 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
1385 unsigned int packets = 0;
1386 unsigned int bytes = 0;
1389 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1390 if (likely(!is_xdp_frame(ptr))) {
1391 struct sk_buff *skb = ptr;
1393 pr_debug("Sent skb %p\n", skb);
1396 napi_consume_skb(skb, in_napi);
1398 struct xdp_frame *frame = ptr_to_xdp(ptr);
1400 bytes += frame->len;
1401 xdp_return_frame(frame);
1406 /* Avoid overhead when no packets have been processed
1407 * happens when called speculatively from start_xmit.
1412 u64_stats_update_begin(&sq->stats.syncp);
1413 sq->stats.bytes += bytes;
1414 sq->stats.packets += packets;
1415 u64_stats_update_end(&sq->stats.syncp);
1418 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1420 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1422 else if (q < vi->curr_queue_pairs)
1428 static void virtnet_poll_cleantx(struct receive_queue *rq)
1430 struct virtnet_info *vi = rq->vq->vdev->priv;
1431 unsigned int index = vq2rxq(rq->vq);
1432 struct send_queue *sq = &vi->sq[index];
1433 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1435 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
1438 if (__netif_tx_trylock(txq)) {
1439 free_old_xmit_skbs(sq, true);
1440 __netif_tx_unlock(txq);
1443 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1444 netif_tx_wake_queue(txq);
1447 static int virtnet_poll(struct napi_struct *napi, int budget)
1449 struct receive_queue *rq =
1450 container_of(napi, struct receive_queue, napi);
1451 struct virtnet_info *vi = rq->vq->vdev->priv;
1452 struct send_queue *sq;
1453 unsigned int received;
1454 unsigned int xdp_xmit = 0;
1456 virtnet_poll_cleantx(rq);
1458 received = virtnet_receive(rq, budget, &xdp_xmit);
1460 /* Out of packets? */
1461 if (received < budget)
1462 virtqueue_napi_complete(napi, rq->vq, received);
1464 if (xdp_xmit & VIRTIO_XDP_REDIR)
1467 if (xdp_xmit & VIRTIO_XDP_TX) {
1468 sq = virtnet_xdp_sq(vi);
1469 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1470 u64_stats_update_begin(&sq->stats.syncp);
1472 u64_stats_update_end(&sq->stats.syncp);
1479 static int virtnet_open(struct net_device *dev)
1481 struct virtnet_info *vi = netdev_priv(dev);
1484 for (i = 0; i < vi->max_queue_pairs; i++) {
1485 if (i < vi->curr_queue_pairs)
1486 /* Make sure we have some buffers: if oom use wq. */
1487 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1488 schedule_delayed_work(&vi->refill, 0);
1490 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i);
1494 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1495 MEM_TYPE_PAGE_SHARED, NULL);
1497 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1501 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1502 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1508 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1510 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1511 struct virtnet_info *vi = sq->vq->vdev->priv;
1512 unsigned int index = vq2txq(sq->vq);
1513 struct netdev_queue *txq;
1515 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
1516 /* We don't need to enable cb for XDP */
1517 napi_complete_done(napi, 0);
1521 txq = netdev_get_tx_queue(vi->dev, index);
1522 __netif_tx_lock(txq, raw_smp_processor_id());
1523 free_old_xmit_skbs(sq, true);
1524 __netif_tx_unlock(txq);
1526 virtqueue_napi_complete(napi, sq->vq, 0);
1528 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1529 netif_tx_wake_queue(txq);
1534 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1536 struct virtio_net_hdr_mrg_rxbuf *hdr;
1537 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1538 struct virtnet_info *vi = sq->vq->vdev->priv;
1540 unsigned hdr_len = vi->hdr_len;
1543 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1545 can_push = vi->any_header_sg &&
1546 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1547 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1548 /* Even if we can, don't push here yet as this would skew
1549 * csum_start offset below. */
1551 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1553 hdr = skb_vnet_hdr(skb);
1555 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1556 virtio_is_little_endian(vi->vdev), false,
1560 if (vi->mergeable_rx_bufs)
1561 hdr->num_buffers = 0;
1563 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1565 __skb_push(skb, hdr_len);
1566 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1567 if (unlikely(num_sg < 0))
1569 /* Pull header back to avoid skew in tx bytes calculations. */
1570 __skb_pull(skb, hdr_len);
1572 sg_set_buf(sq->sg, hdr, hdr_len);
1573 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1574 if (unlikely(num_sg < 0))
1578 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1581 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1583 struct virtnet_info *vi = netdev_priv(dev);
1584 int qnum = skb_get_queue_mapping(skb);
1585 struct send_queue *sq = &vi->sq[qnum];
1587 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1588 bool kick = !netdev_xmit_more();
1589 bool use_napi = sq->napi.weight;
1591 /* Free up any pending old buffers before queueing new ones. */
1592 free_old_xmit_skbs(sq, false);
1594 if (use_napi && kick)
1595 virtqueue_enable_cb_delayed(sq->vq);
1597 /* timestamp packet in software */
1598 skb_tx_timestamp(skb);
1600 /* Try to transmit */
1601 err = xmit_skb(sq, skb);
1603 /* This should not happen! */
1604 if (unlikely(err)) {
1605 dev->stats.tx_fifo_errors++;
1606 if (net_ratelimit())
1608 "Unexpected TXQ (%d) queue failure: %d\n",
1610 dev->stats.tx_dropped++;
1611 dev_kfree_skb_any(skb);
1612 return NETDEV_TX_OK;
1615 /* Don't wait up for transmitted skbs to be freed. */
1621 /* If running out of space, stop queue to avoid getting packets that we
1622 * are then unable to transmit.
1623 * An alternative would be to force queuing layer to requeue the skb by
1624 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1625 * returned in a normal path of operation: it means that driver is not
1626 * maintaining the TX queue stop/start state properly, and causes
1627 * the stack to do a non-trivial amount of useless work.
1628 * Since most packets only take 1 or 2 ring slots, stopping the queue
1629 * early means 16 slots are typically wasted.
1631 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1632 netif_stop_subqueue(dev, qnum);
1634 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1635 /* More just got used, free them then recheck. */
1636 free_old_xmit_skbs(sq, false);
1637 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1638 netif_start_subqueue(dev, qnum);
1639 virtqueue_disable_cb(sq->vq);
1644 if (kick || netif_xmit_stopped(txq)) {
1645 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1646 u64_stats_update_begin(&sq->stats.syncp);
1648 u64_stats_update_end(&sq->stats.syncp);
1652 return NETDEV_TX_OK;
1656 * Send command via the control virtqueue and check status. Commands
1657 * supported by the hypervisor, as indicated by feature bits, should
1658 * never fail unless improperly formatted.
1660 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1661 struct scatterlist *out)
1663 struct scatterlist *sgs[4], hdr, stat;
1664 unsigned out_num = 0, tmp;
1666 /* Caller should know better */
1667 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1669 vi->ctrl->status = ~0;
1670 vi->ctrl->hdr.class = class;
1671 vi->ctrl->hdr.cmd = cmd;
1673 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1674 sgs[out_num++] = &hdr;
1677 sgs[out_num++] = out;
1679 /* Add return status. */
1680 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1681 sgs[out_num] = &stat;
1683 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1684 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1686 if (unlikely(!virtqueue_kick(vi->cvq)))
1687 return vi->ctrl->status == VIRTIO_NET_OK;
1689 /* Spin for a response, the kick causes an ioport write, trapping
1690 * into the hypervisor, so the request should be handled immediately.
1692 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1693 !virtqueue_is_broken(vi->cvq))
1696 return vi->ctrl->status == VIRTIO_NET_OK;
1699 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1701 struct virtnet_info *vi = netdev_priv(dev);
1702 struct virtio_device *vdev = vi->vdev;
1704 struct sockaddr *addr;
1705 struct scatterlist sg;
1707 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1710 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1714 ret = eth_prepare_mac_addr_change(dev, addr);
1718 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1719 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1720 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1721 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1722 dev_warn(&vdev->dev,
1723 "Failed to set mac address by vq command.\n");
1727 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1728 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1731 /* Naturally, this has an atomicity problem. */
1732 for (i = 0; i < dev->addr_len; i++)
1733 virtio_cwrite8(vdev,
1734 offsetof(struct virtio_net_config, mac) +
1735 i, addr->sa_data[i]);
1738 eth_commit_mac_addr_change(dev, p);
1746 static void virtnet_stats(struct net_device *dev,
1747 struct rtnl_link_stats64 *tot)
1749 struct virtnet_info *vi = netdev_priv(dev);
1753 for (i = 0; i < vi->max_queue_pairs; i++) {
1754 u64 tpackets, tbytes, rpackets, rbytes, rdrops;
1755 struct receive_queue *rq = &vi->rq[i];
1756 struct send_queue *sq = &vi->sq[i];
1759 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1760 tpackets = sq->stats.packets;
1761 tbytes = sq->stats.bytes;
1762 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1765 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1766 rpackets = rq->stats.packets;
1767 rbytes = rq->stats.bytes;
1768 rdrops = rq->stats.drops;
1769 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1771 tot->rx_packets += rpackets;
1772 tot->tx_packets += tpackets;
1773 tot->rx_bytes += rbytes;
1774 tot->tx_bytes += tbytes;
1775 tot->rx_dropped += rdrops;
1778 tot->tx_dropped = dev->stats.tx_dropped;
1779 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1780 tot->rx_length_errors = dev->stats.rx_length_errors;
1781 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1784 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1787 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1788 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1789 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1793 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1795 struct scatterlist sg;
1796 struct net_device *dev = vi->dev;
1798 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1801 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1802 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1804 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1805 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1806 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1810 vi->curr_queue_pairs = queue_pairs;
1811 /* virtnet_open() will refill when device is going to up. */
1812 if (dev->flags & IFF_UP)
1813 schedule_delayed_work(&vi->refill, 0);
1819 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1824 err = _virtnet_set_queues(vi, queue_pairs);
1829 static int virtnet_close(struct net_device *dev)
1831 struct virtnet_info *vi = netdev_priv(dev);
1834 /* Make sure refill_work doesn't re-enable napi! */
1835 cancel_delayed_work_sync(&vi->refill);
1837 for (i = 0; i < vi->max_queue_pairs; i++) {
1838 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1839 napi_disable(&vi->rq[i].napi);
1840 virtnet_napi_tx_disable(&vi->sq[i].napi);
1846 static void virtnet_set_rx_mode(struct net_device *dev)
1848 struct virtnet_info *vi = netdev_priv(dev);
1849 struct scatterlist sg[2];
1850 struct virtio_net_ctrl_mac *mac_data;
1851 struct netdev_hw_addr *ha;
1857 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1858 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1861 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1862 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1864 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1866 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1867 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1868 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1869 vi->ctrl->promisc ? "en" : "dis");
1871 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1873 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1874 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1875 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1876 vi->ctrl->allmulti ? "en" : "dis");
1878 uc_count = netdev_uc_count(dev);
1879 mc_count = netdev_mc_count(dev);
1880 /* MAC filter - use one buffer for both lists */
1881 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1882 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1887 sg_init_table(sg, 2);
1889 /* Store the unicast list and count in the front of the buffer */
1890 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1892 netdev_for_each_uc_addr(ha, dev)
1893 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1895 sg_set_buf(&sg[0], mac_data,
1896 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1898 /* multicast list and count fill the end */
1899 mac_data = (void *)&mac_data->macs[uc_count][0];
1901 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
1903 netdev_for_each_mc_addr(ha, dev)
1904 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1906 sg_set_buf(&sg[1], mac_data,
1907 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
1909 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1910 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
1911 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
1916 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
1917 __be16 proto, u16 vid)
1919 struct virtnet_info *vi = netdev_priv(dev);
1920 struct scatterlist sg;
1922 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1923 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1925 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1926 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
1927 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
1931 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
1932 __be16 proto, u16 vid)
1934 struct virtnet_info *vi = netdev_priv(dev);
1935 struct scatterlist sg;
1937 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
1938 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
1940 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
1941 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
1942 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
1946 static void virtnet_clean_affinity(struct virtnet_info *vi)
1950 if (vi->affinity_hint_set) {
1951 for (i = 0; i < vi->max_queue_pairs; i++) {
1952 virtqueue_set_affinity(vi->rq[i].vq, NULL);
1953 virtqueue_set_affinity(vi->sq[i].vq, NULL);
1956 vi->affinity_hint_set = false;
1960 static void virtnet_set_affinity(struct virtnet_info *vi)
1969 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1970 virtnet_clean_affinity(vi);
1974 num_cpu = num_online_cpus();
1975 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
1976 stragglers = num_cpu >= vi->curr_queue_pairs ?
1977 num_cpu % vi->curr_queue_pairs :
1979 cpu = cpumask_next(-1, cpu_online_mask);
1981 for (i = 0; i < vi->curr_queue_pairs; i++) {
1982 group_size = stride + (i < stragglers ? 1 : 0);
1984 for (j = 0; j < group_size; j++) {
1985 cpumask_set_cpu(cpu, mask);
1986 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
1989 virtqueue_set_affinity(vi->rq[i].vq, mask);
1990 virtqueue_set_affinity(vi->sq[i].vq, mask);
1991 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false);
1992 cpumask_clear(mask);
1995 vi->affinity_hint_set = true;
1996 free_cpumask_var(mask);
1999 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
2001 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2003 virtnet_set_affinity(vi);
2007 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
2009 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2011 virtnet_set_affinity(vi);
2015 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
2017 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2020 virtnet_clean_affinity(vi);
2024 static enum cpuhp_state virtionet_online;
2026 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
2030 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
2033 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2037 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2041 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
2043 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2044 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2048 static void virtnet_get_ringparam(struct net_device *dev,
2049 struct ethtool_ringparam *ring)
2051 struct virtnet_info *vi = netdev_priv(dev);
2053 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
2054 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
2055 ring->rx_pending = ring->rx_max_pending;
2056 ring->tx_pending = ring->tx_max_pending;
2060 static void virtnet_get_drvinfo(struct net_device *dev,
2061 struct ethtool_drvinfo *info)
2063 struct virtnet_info *vi = netdev_priv(dev);
2064 struct virtio_device *vdev = vi->vdev;
2066 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
2067 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
2068 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
2072 /* TODO: Eliminate OOO packets during switching */
2073 static int virtnet_set_channels(struct net_device *dev,
2074 struct ethtool_channels *channels)
2076 struct virtnet_info *vi = netdev_priv(dev);
2077 u16 queue_pairs = channels->combined_count;
2080 /* We don't support separate rx/tx channels.
2081 * We don't allow setting 'other' channels.
2083 if (channels->rx_count || channels->tx_count || channels->other_count)
2086 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
2089 /* For now we don't support modifying channels while XDP is loaded
2090 * also when XDP is loaded all RX queues have XDP programs so we only
2091 * need to check a single RX queue.
2093 if (vi->rq[0].xdp_prog)
2097 err = _virtnet_set_queues(vi, queue_pairs);
2099 netif_set_real_num_tx_queues(dev, queue_pairs);
2100 netif_set_real_num_rx_queues(dev, queue_pairs);
2102 virtnet_set_affinity(vi);
2109 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2111 struct virtnet_info *vi = netdev_priv(dev);
2112 char *p = (char *)data;
2115 switch (stringset) {
2117 for (i = 0; i < vi->curr_queue_pairs; i++) {
2118 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2119 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
2120 i, virtnet_rq_stats_desc[j].desc);
2121 p += ETH_GSTRING_LEN;
2125 for (i = 0; i < vi->curr_queue_pairs; i++) {
2126 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2127 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
2128 i, virtnet_sq_stats_desc[j].desc);
2129 p += ETH_GSTRING_LEN;
2136 static int virtnet_get_sset_count(struct net_device *dev, int sset)
2138 struct virtnet_info *vi = netdev_priv(dev);
2142 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2143 VIRTNET_SQ_STATS_LEN);
2149 static void virtnet_get_ethtool_stats(struct net_device *dev,
2150 struct ethtool_stats *stats, u64 *data)
2152 struct virtnet_info *vi = netdev_priv(dev);
2153 unsigned int idx = 0, start, i, j;
2154 const u8 *stats_base;
2157 for (i = 0; i < vi->curr_queue_pairs; i++) {
2158 struct receive_queue *rq = &vi->rq[i];
2160 stats_base = (u8 *)&rq->stats;
2162 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2163 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2164 offset = virtnet_rq_stats_desc[j].offset;
2165 data[idx + j] = *(u64 *)(stats_base + offset);
2167 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2168 idx += VIRTNET_RQ_STATS_LEN;
2171 for (i = 0; i < vi->curr_queue_pairs; i++) {
2172 struct send_queue *sq = &vi->sq[i];
2174 stats_base = (u8 *)&sq->stats;
2176 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2177 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2178 offset = virtnet_sq_stats_desc[j].offset;
2179 data[idx + j] = *(u64 *)(stats_base + offset);
2181 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2182 idx += VIRTNET_SQ_STATS_LEN;
2186 static void virtnet_get_channels(struct net_device *dev,
2187 struct ethtool_channels *channels)
2189 struct virtnet_info *vi = netdev_priv(dev);
2191 channels->combined_count = vi->curr_queue_pairs;
2192 channels->max_combined = vi->max_queue_pairs;
2193 channels->max_other = 0;
2194 channels->rx_count = 0;
2195 channels->tx_count = 0;
2196 channels->other_count = 0;
2199 static int virtnet_set_link_ksettings(struct net_device *dev,
2200 const struct ethtool_link_ksettings *cmd)
2202 struct virtnet_info *vi = netdev_priv(dev);
2204 return ethtool_virtdev_set_link_ksettings(dev, cmd,
2205 &vi->speed, &vi->duplex);
2208 static int virtnet_get_link_ksettings(struct net_device *dev,
2209 struct ethtool_link_ksettings *cmd)
2211 struct virtnet_info *vi = netdev_priv(dev);
2213 cmd->base.speed = vi->speed;
2214 cmd->base.duplex = vi->duplex;
2215 cmd->base.port = PORT_OTHER;
2220 static int virtnet_set_coalesce(struct net_device *dev,
2221 struct ethtool_coalesce *ec)
2223 struct virtnet_info *vi = netdev_priv(dev);
2226 if (ec->tx_max_coalesced_frames > 1 ||
2227 ec->rx_max_coalesced_frames != 1)
2230 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
2231 if (napi_weight ^ vi->sq[0].napi.weight) {
2232 if (dev->flags & IFF_UP)
2234 for (i = 0; i < vi->max_queue_pairs; i++)
2235 vi->sq[i].napi.weight = napi_weight;
2241 static int virtnet_get_coalesce(struct net_device *dev,
2242 struct ethtool_coalesce *ec)
2244 struct ethtool_coalesce ec_default = {
2245 .cmd = ETHTOOL_GCOALESCE,
2246 .rx_max_coalesced_frames = 1,
2248 struct virtnet_info *vi = netdev_priv(dev);
2250 memcpy(ec, &ec_default, sizeof(ec_default));
2252 if (vi->sq[0].napi.weight)
2253 ec->tx_max_coalesced_frames = 1;
2258 static void virtnet_init_settings(struct net_device *dev)
2260 struct virtnet_info *vi = netdev_priv(dev);
2262 vi->speed = SPEED_UNKNOWN;
2263 vi->duplex = DUPLEX_UNKNOWN;
2266 static void virtnet_update_settings(struct virtnet_info *vi)
2271 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2274 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
2276 if (ethtool_validate_speed(speed))
2279 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
2281 if (ethtool_validate_duplex(duplex))
2282 vi->duplex = duplex;
2285 static const struct ethtool_ops virtnet_ethtool_ops = {
2286 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
2287 .get_drvinfo = virtnet_get_drvinfo,
2288 .get_link = ethtool_op_get_link,
2289 .get_ringparam = virtnet_get_ringparam,
2290 .get_strings = virtnet_get_strings,
2291 .get_sset_count = virtnet_get_sset_count,
2292 .get_ethtool_stats = virtnet_get_ethtool_stats,
2293 .set_channels = virtnet_set_channels,
2294 .get_channels = virtnet_get_channels,
2295 .get_ts_info = ethtool_op_get_ts_info,
2296 .get_link_ksettings = virtnet_get_link_ksettings,
2297 .set_link_ksettings = virtnet_set_link_ksettings,
2298 .set_coalesce = virtnet_set_coalesce,
2299 .get_coalesce = virtnet_get_coalesce,
2302 static void virtnet_freeze_down(struct virtio_device *vdev)
2304 struct virtnet_info *vi = vdev->priv;
2307 /* Make sure no work handler is accessing the device */
2308 flush_work(&vi->config_work);
2310 netif_tx_lock_bh(vi->dev);
2311 netif_device_detach(vi->dev);
2312 netif_tx_unlock_bh(vi->dev);
2313 cancel_delayed_work_sync(&vi->refill);
2315 if (netif_running(vi->dev)) {
2316 for (i = 0; i < vi->max_queue_pairs; i++) {
2317 napi_disable(&vi->rq[i].napi);
2318 virtnet_napi_tx_disable(&vi->sq[i].napi);
2323 static int init_vqs(struct virtnet_info *vi);
2325 static int virtnet_restore_up(struct virtio_device *vdev)
2327 struct virtnet_info *vi = vdev->priv;
2334 virtio_device_ready(vdev);
2336 if (netif_running(vi->dev)) {
2337 for (i = 0; i < vi->curr_queue_pairs; i++)
2338 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
2339 schedule_delayed_work(&vi->refill, 0);
2341 for (i = 0; i < vi->max_queue_pairs; i++) {
2342 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2343 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2348 netif_tx_lock_bh(vi->dev);
2349 netif_device_attach(vi->dev);
2350 netif_tx_unlock_bh(vi->dev);
2354 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2356 struct scatterlist sg;
2357 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2359 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2361 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2362 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2363 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
2370 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2374 if (!vi->guest_offloads)
2377 return virtnet_set_guest_offloads(vi, offloads);
2380 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2382 u64 offloads = vi->guest_offloads;
2384 if (!vi->guest_offloads)
2387 return virtnet_set_guest_offloads(vi, offloads);
2390 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2391 struct netlink_ext_ack *extack)
2393 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2394 struct virtnet_info *vi = netdev_priv(dev);
2395 struct bpf_prog *old_prog;
2396 u16 xdp_qp = 0, curr_qp;
2399 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2400 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2401 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2402 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2403 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
2404 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
2405 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first");
2409 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2410 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2414 if (dev->mtu > max_sz) {
2415 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2416 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2420 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2422 xdp_qp = nr_cpu_ids;
2424 /* XDP requires extra queues for XDP_TX */
2425 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2426 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available");
2427 netdev_warn(dev, "request %i queues but max is %i\n",
2428 curr_qp + xdp_qp, vi->max_queue_pairs);
2432 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
2433 if (!prog && !old_prog)
2437 bpf_prog_add(prog, vi->max_queue_pairs - 1);
2439 /* Make sure NAPI is not using any XDP TX queues for RX. */
2440 if (netif_running(dev)) {
2441 for (i = 0; i < vi->max_queue_pairs; i++) {
2442 napi_disable(&vi->rq[i].napi);
2443 virtnet_napi_tx_disable(&vi->sq[i].napi);
2448 for (i = 0; i < vi->max_queue_pairs; i++) {
2449 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2451 virtnet_restore_guest_offloads(vi);
2456 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2459 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2460 vi->xdp_queue_pairs = xdp_qp;
2463 for (i = 0; i < vi->max_queue_pairs; i++) {
2464 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2465 if (i == 0 && !old_prog)
2466 virtnet_clear_guest_offloads(vi);
2470 for (i = 0; i < vi->max_queue_pairs; i++) {
2472 bpf_prog_put(old_prog);
2473 if (netif_running(dev)) {
2474 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2475 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2484 virtnet_clear_guest_offloads(vi);
2485 for (i = 0; i < vi->max_queue_pairs; i++)
2486 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
2489 if (netif_running(dev)) {
2490 for (i = 0; i < vi->max_queue_pairs; i++) {
2491 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2492 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2497 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2501 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2503 switch (xdp->command) {
2504 case XDP_SETUP_PROG:
2505 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2511 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2514 struct virtnet_info *vi = netdev_priv(dev);
2517 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2520 ret = snprintf(buf, len, "sby");
2527 static netdev_features_t virtnet_fix_features(struct net_device *netdev,
2528 netdev_features_t features)
2530 /* If Rx checksum is disabled, LRO should also be disabled. */
2531 if (!(features & NETIF_F_RXCSUM))
2532 features &= ~NETIF_F_LRO;
2537 static int virtnet_set_features(struct net_device *dev,
2538 netdev_features_t features)
2540 struct virtnet_info *vi = netdev_priv(dev);
2541 u64 offloads = vi->guest_offloads;
2544 /* Don't allow configuration while XDP is active. */
2545 if (vi->xdp_queue_pairs)
2548 if ((dev->features ^ features) & NETIF_F_LRO) {
2549 if (features & NETIF_F_LRO)
2550 offloads |= GUEST_OFFLOAD_LRO_MASK &
2551 vi->guest_offloads_capable;
2553 offloads &= ~GUEST_OFFLOAD_LRO_MASK;
2556 if ((dev->features ^ features) & NETIF_F_RXCSUM) {
2557 if (features & NETIF_F_RXCSUM)
2558 offloads |= GUEST_OFFLOAD_CSUM_MASK &
2559 vi->guest_offloads_capable;
2561 offloads &= ~GUEST_OFFLOAD_CSUM_MASK;
2564 err = virtnet_set_guest_offloads(vi, offloads);
2568 vi->guest_offloads = offloads;
2572 static const struct net_device_ops virtnet_netdev = {
2573 .ndo_open = virtnet_open,
2574 .ndo_stop = virtnet_close,
2575 .ndo_start_xmit = start_xmit,
2576 .ndo_validate_addr = eth_validate_addr,
2577 .ndo_set_mac_address = virtnet_set_mac_address,
2578 .ndo_set_rx_mode = virtnet_set_rx_mode,
2579 .ndo_get_stats64 = virtnet_stats,
2580 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2581 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2582 .ndo_bpf = virtnet_xdp,
2583 .ndo_xdp_xmit = virtnet_xdp_xmit,
2584 .ndo_features_check = passthru_features_check,
2585 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2586 .ndo_set_features = virtnet_set_features,
2587 .ndo_fix_features = virtnet_fix_features,
2590 static void virtnet_config_changed_work(struct work_struct *work)
2592 struct virtnet_info *vi =
2593 container_of(work, struct virtnet_info, config_work);
2596 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2597 struct virtio_net_config, status, &v) < 0)
2600 if (v & VIRTIO_NET_S_ANNOUNCE) {
2601 netdev_notify_peers(vi->dev);
2602 virtnet_ack_link_announce(vi);
2605 /* Ignore unknown (future) status bits */
2606 v &= VIRTIO_NET_S_LINK_UP;
2608 if (vi->status == v)
2613 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2614 virtnet_update_settings(vi);
2615 netif_carrier_on(vi->dev);
2616 netif_tx_wake_all_queues(vi->dev);
2618 netif_carrier_off(vi->dev);
2619 netif_tx_stop_all_queues(vi->dev);
2623 static void virtnet_config_changed(struct virtio_device *vdev)
2625 struct virtnet_info *vi = vdev->priv;
2627 schedule_work(&vi->config_work);
2630 static void virtnet_free_queues(struct virtnet_info *vi)
2634 for (i = 0; i < vi->max_queue_pairs; i++) {
2635 __netif_napi_del(&vi->rq[i].napi);
2636 __netif_napi_del(&vi->sq[i].napi);
2639 /* We called __netif_napi_del(),
2640 * we need to respect an RCU grace period before freeing vi->rq
2649 static void _free_receive_bufs(struct virtnet_info *vi)
2651 struct bpf_prog *old_prog;
2654 for (i = 0; i < vi->max_queue_pairs; i++) {
2655 while (vi->rq[i].pages)
2656 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2658 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2659 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2661 bpf_prog_put(old_prog);
2665 static void free_receive_bufs(struct virtnet_info *vi)
2668 _free_receive_bufs(vi);
2672 static void free_receive_page_frags(struct virtnet_info *vi)
2675 for (i = 0; i < vi->max_queue_pairs; i++)
2676 if (vi->rq[i].alloc_frag.page)
2677 put_page(vi->rq[i].alloc_frag.page);
2680 static void free_unused_bufs(struct virtnet_info *vi)
2685 for (i = 0; i < vi->max_queue_pairs; i++) {
2686 struct virtqueue *vq = vi->sq[i].vq;
2687 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2688 if (!is_xdp_frame(buf))
2691 xdp_return_frame(ptr_to_xdp(buf));
2695 for (i = 0; i < vi->max_queue_pairs; i++) {
2696 struct virtqueue *vq = vi->rq[i].vq;
2698 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
2699 if (vi->mergeable_rx_bufs) {
2700 put_page(virt_to_head_page(buf));
2701 } else if (vi->big_packets) {
2702 give_pages(&vi->rq[i], buf);
2704 put_page(virt_to_head_page(buf));
2710 static void virtnet_del_vqs(struct virtnet_info *vi)
2712 struct virtio_device *vdev = vi->vdev;
2714 virtnet_clean_affinity(vi);
2716 vdev->config->del_vqs(vdev);
2718 virtnet_free_queues(vi);
2721 /* How large should a single buffer be so a queue full of these can fit at
2722 * least one full packet?
2723 * Logic below assumes the mergeable buffer header is used.
2725 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2727 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2728 unsigned int rq_size = virtqueue_get_vring_size(vq);
2729 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2730 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2731 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2733 return max(max(min_buf_len, hdr_len) - hdr_len,
2734 (unsigned int)GOOD_PACKET_LEN);
2737 static int virtnet_find_vqs(struct virtnet_info *vi)
2739 vq_callback_t **callbacks;
2740 struct virtqueue **vqs;
2746 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
2747 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
2748 * possible control vq.
2750 total_vqs = vi->max_queue_pairs * 2 +
2751 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2753 /* Allocate space for find_vqs parameters */
2754 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2757 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2760 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2763 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2764 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2771 /* Parameters for control virtqueue, if any */
2773 callbacks[total_vqs - 1] = NULL;
2774 names[total_vqs - 1] = "control";
2777 /* Allocate/initialize parameters for send/receive virtqueues */
2778 for (i = 0; i < vi->max_queue_pairs; i++) {
2779 callbacks[rxq2vq(i)] = skb_recv_done;
2780 callbacks[txq2vq(i)] = skb_xmit_done;
2781 sprintf(vi->rq[i].name, "input.%d", i);
2782 sprintf(vi->sq[i].name, "output.%d", i);
2783 names[rxq2vq(i)] = vi->rq[i].name;
2784 names[txq2vq(i)] = vi->sq[i].name;
2786 ctx[rxq2vq(i)] = true;
2789 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
2795 vi->cvq = vqs[total_vqs - 1];
2796 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2797 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2800 for (i = 0; i < vi->max_queue_pairs; i++) {
2801 vi->rq[i].vq = vqs[rxq2vq(i)];
2802 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2803 vi->sq[i].vq = vqs[txq2vq(i)];
2806 /* run here: ret == 0. */
2821 static int virtnet_alloc_queues(struct virtnet_info *vi)
2825 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2828 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2831 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2835 INIT_DELAYED_WORK(&vi->refill, refill_work);
2836 for (i = 0; i < vi->max_queue_pairs; i++) {
2837 vi->rq[i].pages = NULL;
2838 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2840 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2841 napi_tx ? napi_weight : 0);
2843 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2844 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2845 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2847 u64_stats_init(&vi->rq[i].stats.syncp);
2848 u64_stats_init(&vi->sq[i].stats.syncp);
2861 static int init_vqs(struct virtnet_info *vi)
2865 /* Allocate send & receive queues */
2866 ret = virtnet_alloc_queues(vi);
2870 ret = virtnet_find_vqs(vi);
2875 virtnet_set_affinity(vi);
2881 virtnet_free_queues(vi);
2887 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2890 struct virtnet_info *vi = netdev_priv(queue->dev);
2891 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2892 unsigned int headroom = virtnet_get_headroom(vi);
2893 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2894 struct ewma_pkt_len *avg;
2896 BUG_ON(queue_index >= vi->max_queue_pairs);
2897 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2898 return sprintf(buf, "%u\n",
2899 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2900 SKB_DATA_ALIGN(headroom + tailroom)));
2903 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2904 __ATTR_RO(mergeable_rx_buffer_size);
2906 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2907 &mergeable_rx_buffer_size_attribute.attr,
2911 static const struct attribute_group virtio_net_mrg_rx_group = {
2912 .name = "virtio_net",
2913 .attrs = virtio_net_mrg_rx_attrs
2917 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
2919 const char *fname, const char *dname)
2921 if (!virtio_has_feature(vdev, fbit))
2924 dev_err(&vdev->dev, "device advertises feature %s but not %s",
2930 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
2931 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
2933 static bool virtnet_validate_features(struct virtio_device *vdev)
2935 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
2936 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
2937 "VIRTIO_NET_F_CTRL_VQ") ||
2938 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
2939 "VIRTIO_NET_F_CTRL_VQ") ||
2940 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
2941 "VIRTIO_NET_F_CTRL_VQ") ||
2942 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
2943 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
2944 "VIRTIO_NET_F_CTRL_VQ"))) {
2951 #define MIN_MTU ETH_MIN_MTU
2952 #define MAX_MTU ETH_MAX_MTU
2954 static int virtnet_validate(struct virtio_device *vdev)
2956 if (!vdev->config->get) {
2957 dev_err(&vdev->dev, "%s failure: config access disabled\n",
2962 if (!virtnet_validate_features(vdev))
2965 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
2966 int mtu = virtio_cread16(vdev,
2967 offsetof(struct virtio_net_config,
2970 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
2976 static int virtnet_probe(struct virtio_device *vdev)
2978 int i, err = -ENOMEM;
2979 struct net_device *dev;
2980 struct virtnet_info *vi;
2981 u16 max_queue_pairs;
2984 /* Find if host supports multiqueue virtio_net device */
2985 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
2986 struct virtio_net_config,
2987 max_virtqueue_pairs, &max_queue_pairs);
2989 /* We need at least 2 queue's */
2990 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
2991 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
2992 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
2993 max_queue_pairs = 1;
2995 /* Allocate ourselves a network device with room for our info */
2996 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
3000 /* Set up network device as normal. */
3001 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
3002 dev->netdev_ops = &virtnet_netdev;
3003 dev->features = NETIF_F_HIGHDMA;
3005 dev->ethtool_ops = &virtnet_ethtool_ops;
3006 SET_NETDEV_DEV(dev, &vdev->dev);
3008 /* Do we support "hardware" checksums? */
3009 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
3010 /* This opens up the world of extra features. */
3011 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3013 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3015 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
3016 dev->hw_features |= NETIF_F_TSO
3017 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
3019 /* Individual feature bits: what can host handle? */
3020 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
3021 dev->hw_features |= NETIF_F_TSO;
3022 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
3023 dev->hw_features |= NETIF_F_TSO6;
3024 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
3025 dev->hw_features |= NETIF_F_TSO_ECN;
3027 dev->features |= NETIF_F_GSO_ROBUST;
3030 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
3031 /* (!csum && gso) case will be fixed by register_netdev() */
3033 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
3034 dev->features |= NETIF_F_RXCSUM;
3035 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3036 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
3037 dev->features |= NETIF_F_LRO;
3038 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
3039 dev->hw_features |= NETIF_F_RXCSUM;
3040 dev->hw_features |= NETIF_F_LRO;
3043 dev->vlan_features = dev->features;
3045 /* MTU range: 68 - 65535 */
3046 dev->min_mtu = MIN_MTU;
3047 dev->max_mtu = MAX_MTU;
3049 /* Configuration may specify what MAC to use. Otherwise random. */
3050 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
3051 virtio_cread_bytes(vdev,
3052 offsetof(struct virtio_net_config, mac),
3053 dev->dev_addr, dev->addr_len);
3055 eth_hw_addr_random(dev);
3057 /* Set up our device-specific information */
3058 vi = netdev_priv(dev);
3063 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
3065 /* If we can receive ANY GSO packets, we must allocate large ones. */
3066 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3067 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
3068 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
3069 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
3070 vi->big_packets = true;
3072 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
3073 vi->mergeable_rx_bufs = true;
3075 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
3076 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3077 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
3079 vi->hdr_len = sizeof(struct virtio_net_hdr);
3081 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
3082 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3083 vi->any_header_sg = true;
3085 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3088 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3089 mtu = virtio_cread16(vdev,
3090 offsetof(struct virtio_net_config,
3092 if (mtu < dev->min_mtu) {
3093 /* Should never trigger: MTU was previously validated
3094 * in virtnet_validate.
3097 "device MTU appears to have changed it is now %d < %d",
3105 /* TODO: size buffers correctly in this case. */
3106 if (dev->mtu > ETH_DATA_LEN)
3107 vi->big_packets = true;
3110 if (vi->any_header_sg)
3111 dev->needed_headroom = vi->hdr_len;
3113 /* Enable multiqueue by default */
3114 if (num_online_cpus() >= max_queue_pairs)
3115 vi->curr_queue_pairs = max_queue_pairs;
3117 vi->curr_queue_pairs = num_online_cpus();
3118 vi->max_queue_pairs = max_queue_pairs;
3120 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
3126 if (vi->mergeable_rx_bufs)
3127 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
3129 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
3130 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
3132 virtnet_init_settings(dev);
3134 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3135 vi->failover = net_failover_create(vi->dev);
3136 if (IS_ERR(vi->failover)) {
3137 err = PTR_ERR(vi->failover);
3142 err = register_netdev(dev);
3144 pr_debug("virtio_net: registering device failed\n");
3148 virtio_device_ready(vdev);
3150 err = virtnet_cpu_notif_add(vi);
3152 pr_debug("virtio_net: registering cpu notifier failed\n");
3153 goto free_unregister_netdev;
3156 virtnet_set_queues(vi, vi->curr_queue_pairs);
3158 /* Assume link up if device can't report link status,
3159 otherwise get link status from config. */
3160 netif_carrier_off(dev);
3161 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3162 schedule_work(&vi->config_work);
3164 vi->status = VIRTIO_NET_S_LINK_UP;
3165 virtnet_update_settings(vi);
3166 netif_carrier_on(dev);
3169 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
3170 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
3171 set_bit(guest_offloads[i], &vi->guest_offloads);
3172 vi->guest_offloads_capable = vi->guest_offloads;
3174 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
3175 dev->name, max_queue_pairs);
3179 free_unregister_netdev:
3180 vi->vdev->config->reset(vdev);
3182 unregister_netdev(dev);
3184 net_failover_destroy(vi->failover);
3186 cancel_delayed_work_sync(&vi->refill);
3187 free_receive_page_frags(vi);
3188 virtnet_del_vqs(vi);
3194 static void remove_vq_common(struct virtnet_info *vi)
3196 vi->vdev->config->reset(vi->vdev);
3198 /* Free unused buffers in both send and recv, if any. */
3199 free_unused_bufs(vi);
3201 free_receive_bufs(vi);
3203 free_receive_page_frags(vi);
3205 virtnet_del_vqs(vi);
3208 static void virtnet_remove(struct virtio_device *vdev)
3210 struct virtnet_info *vi = vdev->priv;
3212 virtnet_cpu_notif_remove(vi);
3214 /* Make sure no work handler is accessing the device. */
3215 flush_work(&vi->config_work);
3217 unregister_netdev(vi->dev);
3219 net_failover_destroy(vi->failover);
3221 remove_vq_common(vi);
3223 free_netdev(vi->dev);
3226 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3228 struct virtnet_info *vi = vdev->priv;
3230 virtnet_cpu_notif_remove(vi);
3231 virtnet_freeze_down(vdev);
3232 remove_vq_common(vi);
3237 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3239 struct virtnet_info *vi = vdev->priv;
3242 err = virtnet_restore_up(vdev);
3245 virtnet_set_queues(vi, vi->curr_queue_pairs);
3247 err = virtnet_cpu_notif_add(vi);
3254 static struct virtio_device_id id_table[] = {
3255 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3259 #define VIRTNET_FEATURES \
3260 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3262 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3263 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3264 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3265 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3266 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3267 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3268 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3269 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3270 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3272 static unsigned int features[] = {
3276 static unsigned int features_legacy[] = {
3279 VIRTIO_F_ANY_LAYOUT,
3282 static struct virtio_driver virtio_net_driver = {
3283 .feature_table = features,
3284 .feature_table_size = ARRAY_SIZE(features),
3285 .feature_table_legacy = features_legacy,
3286 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3287 .driver.name = KBUILD_MODNAME,
3288 .driver.owner = THIS_MODULE,
3289 .id_table = id_table,
3290 .validate = virtnet_validate,
3291 .probe = virtnet_probe,
3292 .remove = virtnet_remove,
3293 .config_changed = virtnet_config_changed,
3294 #ifdef CONFIG_PM_SLEEP
3295 .freeze = virtnet_freeze,
3296 .restore = virtnet_restore,
3300 static __init int virtio_net_driver_init(void)
3304 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3306 virtnet_cpu_down_prep);
3309 virtionet_online = ret;
3310 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3311 NULL, virtnet_cpu_dead);
3315 ret = register_virtio_driver(&virtio_net_driver);
3320 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3322 cpuhp_remove_multi_state(virtionet_online);
3326 module_init(virtio_net_driver_init);
3328 static __exit void virtio_net_driver_exit(void)
3330 unregister_virtio_driver(&virtio_net_driver);
3331 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3332 cpuhp_remove_multi_state(virtionet_online);
3334 module_exit(virtio_net_driver_exit);
3336 MODULE_DEVICE_TABLE(virtio, id_table);
3337 MODULE_DESCRIPTION("Virtio network driver");
3338 MODULE_LICENSE("GPL");