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_GRO_HW_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 struct virtnet_stat_desc {
72 char desc[ETH_GSTRING_LEN];
76 struct virtnet_sq_stats {
77 struct u64_stats_sync syncp;
85 struct virtnet_rq_stats {
86 struct u64_stats_sync syncp;
97 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
98 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
100 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
101 { "packets", VIRTNET_SQ_STAT(packets) },
102 { "bytes", VIRTNET_SQ_STAT(bytes) },
103 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
104 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
105 { "kicks", VIRTNET_SQ_STAT(kicks) },
108 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
109 { "packets", VIRTNET_RQ_STAT(packets) },
110 { "bytes", VIRTNET_RQ_STAT(bytes) },
111 { "drops", VIRTNET_RQ_STAT(drops) },
112 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
113 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
114 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
115 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
116 { "kicks", VIRTNET_RQ_STAT(kicks) },
119 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
120 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
122 /* Internal representation of a send virtqueue */
124 /* Virtqueue associated with this send _queue */
125 struct virtqueue *vq;
127 /* TX: fragments + linear part + virtio header */
128 struct scatterlist sg[MAX_SKB_FRAGS + 2];
130 /* Name of the send queue: output.$index */
133 struct virtnet_sq_stats stats;
135 struct napi_struct napi;
138 /* Internal representation of a receive virtqueue */
139 struct receive_queue {
140 /* Virtqueue associated with this receive_queue */
141 struct virtqueue *vq;
143 struct napi_struct napi;
145 struct bpf_prog __rcu *xdp_prog;
147 struct virtnet_rq_stats stats;
149 /* Chain pages by the private ptr. */
152 /* Average packet length for mergeable receive buffers. */
153 struct ewma_pkt_len mrg_avg_pkt_len;
155 /* Page frag for packet buffer allocation. */
156 struct page_frag alloc_frag;
158 /* RX: fragments + linear part + virtio header */
159 struct scatterlist sg[MAX_SKB_FRAGS + 2];
161 /* Min single buffer size for mergeable buffers case. */
162 unsigned int min_buf_len;
164 /* Name of this receive queue: input.$index */
167 struct xdp_rxq_info xdp_rxq;
170 /* Control VQ buffers: protected by the rtnl lock */
172 struct virtio_net_ctrl_hdr hdr;
173 virtio_net_ctrl_ack status;
174 struct virtio_net_ctrl_mq mq;
181 struct virtnet_info {
182 struct virtio_device *vdev;
183 struct virtqueue *cvq;
184 struct net_device *dev;
185 struct send_queue *sq;
186 struct receive_queue *rq;
189 /* Max # of queue pairs supported by the device */
192 /* # of queue pairs currently used by the driver */
193 u16 curr_queue_pairs;
195 /* # of XDP queue pairs currently used by the driver */
198 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
201 /* I like... big packets and I cannot lie! */
204 /* Host will merge rx buffers for big packets (shake it! shake it!) */
205 bool mergeable_rx_bufs;
207 /* Has control virtqueue */
210 /* Host can handle any s/g split between our header and packet data */
213 /* Packet virtio header size */
216 /* Work struct for delayed refilling if we run low on memory. */
217 struct delayed_work refill;
219 /* Is delayed refill enabled? */
222 /* The lock to synchronize the access to refill_enabled */
223 spinlock_t refill_lock;
225 /* Work struct for config space updates */
226 struct work_struct config_work;
228 /* Does the affinity hint is set for virtqueues? */
229 bool affinity_hint_set;
231 /* CPU hotplug instances for online & dead */
232 struct hlist_node node;
233 struct hlist_node node_dead;
235 struct control_buf *ctrl;
237 /* Ethtool settings */
241 unsigned long guest_offloads;
242 unsigned long guest_offloads_capable;
244 /* failover when STANDBY feature enabled */
245 struct failover *failover;
248 struct padded_vnet_hdr {
249 struct virtio_net_hdr_mrg_rxbuf hdr;
251 * hdr is in a separate sg buffer, and data sg buffer shares same page
252 * with this header sg. This padding makes next sg 16 byte aligned
258 static bool is_xdp_frame(void *ptr)
260 return (unsigned long)ptr & VIRTIO_XDP_FLAG;
263 static void *xdp_to_ptr(struct xdp_frame *ptr)
265 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
268 static struct xdp_frame *ptr_to_xdp(void *ptr)
270 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
273 /* Converting between virtqueue no. and kernel tx/rx queue no.
274 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
276 static int vq2txq(struct virtqueue *vq)
278 return (vq->index - 1) / 2;
281 static int txq2vq(int txq)
286 static int vq2rxq(struct virtqueue *vq)
288 return vq->index / 2;
291 static int rxq2vq(int rxq)
296 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
298 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
302 * private is used to chain pages for big packets, put the whole
303 * most recent used list in the beginning for reuse
305 static void give_pages(struct receive_queue *rq, struct page *page)
309 /* Find end of list, sew whole thing into vi->rq.pages. */
310 for (end = page; end->private; end = (struct page *)end->private);
311 end->private = (unsigned long)rq->pages;
315 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
317 struct page *p = rq->pages;
320 rq->pages = (struct page *)p->private;
321 /* clear private here, it is used to chain pages */
324 p = alloc_page(gfp_mask);
328 static void enable_delayed_refill(struct virtnet_info *vi)
330 spin_lock_bh(&vi->refill_lock);
331 vi->refill_enabled = true;
332 spin_unlock_bh(&vi->refill_lock);
335 static void disable_delayed_refill(struct virtnet_info *vi)
337 spin_lock_bh(&vi->refill_lock);
338 vi->refill_enabled = false;
339 spin_unlock_bh(&vi->refill_lock);
342 static void virtqueue_napi_schedule(struct napi_struct *napi,
343 struct virtqueue *vq)
345 if (napi_schedule_prep(napi)) {
346 virtqueue_disable_cb(vq);
347 __napi_schedule(napi);
351 static void virtqueue_napi_complete(struct napi_struct *napi,
352 struct virtqueue *vq, int processed)
356 opaque = virtqueue_enable_cb_prepare(vq);
357 if (napi_complete_done(napi, processed)) {
358 if (unlikely(virtqueue_poll(vq, opaque)))
359 virtqueue_napi_schedule(napi, vq);
361 virtqueue_disable_cb(vq);
365 static void skb_xmit_done(struct virtqueue *vq)
367 struct virtnet_info *vi = vq->vdev->priv;
368 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
370 /* Suppress further interrupts. */
371 virtqueue_disable_cb(vq);
374 virtqueue_napi_schedule(napi, vq);
376 /* We were probably waiting for more output buffers. */
377 netif_wake_subqueue(vi->dev, vq2txq(vq));
380 #define MRG_CTX_HEADER_SHIFT 22
381 static void *mergeable_len_to_ctx(unsigned int truesize,
382 unsigned int headroom)
384 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
387 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
389 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
392 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
394 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
397 /* Called from bottom half context */
398 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
399 struct receive_queue *rq,
400 struct page *page, unsigned int offset,
401 unsigned int len, unsigned int truesize,
402 bool hdr_valid, unsigned int metasize)
405 struct virtio_net_hdr_mrg_rxbuf *hdr;
406 unsigned int copy, hdr_len, hdr_padded_len;
409 p = page_address(page) + offset;
411 /* copy small packet so we can reuse these pages for small data */
412 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
416 hdr = skb_vnet_hdr(skb);
418 hdr_len = vi->hdr_len;
419 if (vi->mergeable_rx_bufs)
420 hdr_padded_len = sizeof(*hdr);
422 hdr_padded_len = sizeof(struct padded_vnet_hdr);
424 /* hdr_valid means no XDP, so we can copy the vnet header */
426 memcpy(hdr, p, hdr_len);
429 offset += hdr_padded_len;
432 /* Copy all frame if it fits skb->head, otherwise
433 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
435 if (len <= skb_tailroom(skb))
438 copy = ETH_HLEN + metasize;
439 skb_put_data(skb, p, copy);
442 __skb_pull(skb, metasize);
443 skb_metadata_set(skb, metasize);
449 if (vi->mergeable_rx_bufs) {
451 skb_add_rx_frag(skb, 0, page, offset, len, truesize);
458 * Verify that we can indeed put this data into a skb.
459 * This is here to handle cases when the device erroneously
460 * tries to receive more than is possible. This is usually
461 * the case of a broken device.
463 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
464 net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
468 BUG_ON(offset >= PAGE_SIZE);
470 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
471 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
472 frag_size, truesize);
474 page = (struct page *)page->private;
479 give_pages(rq, page);
484 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
485 struct send_queue *sq,
486 struct xdp_frame *xdpf)
488 struct virtio_net_hdr_mrg_rxbuf *hdr;
491 if (unlikely(xdpf->headroom < vi->hdr_len))
494 /* Make room for virtqueue hdr (also change xdpf->headroom?) */
495 xdpf->data -= vi->hdr_len;
496 /* Zero header and leave csum up to XDP layers */
498 memset(hdr, 0, vi->hdr_len);
499 xdpf->len += vi->hdr_len;
501 sg_init_one(sq->sg, xdpf->data, xdpf->len);
503 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf),
506 return -ENOSPC; /* Caller handle free/refcnt */
511 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on
512 * the current cpu, so it does not need to be locked.
514 * Here we use marco instead of inline functions because we have to deal with
515 * three issues at the same time: 1. the choice of sq. 2. judge and execute the
516 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline
517 * functions to perfectly solve these three problems at the same time.
519 #define virtnet_xdp_get_sq(vi) ({ \
520 struct netdev_queue *txq; \
521 typeof(vi) v = (vi); \
524 if (v->curr_queue_pairs > nr_cpu_ids) { \
525 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \
526 qp += smp_processor_id(); \
527 txq = netdev_get_tx_queue(v->dev, qp); \
528 __netif_tx_acquire(txq); \
530 qp = smp_processor_id() % v->curr_queue_pairs; \
531 txq = netdev_get_tx_queue(v->dev, qp); \
532 __netif_tx_lock(txq, raw_smp_processor_id()); \
537 #define virtnet_xdp_put_sq(vi, q) { \
538 struct netdev_queue *txq; \
539 typeof(vi) v = (vi); \
541 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \
542 if (v->curr_queue_pairs > nr_cpu_ids) \
543 __netif_tx_release(txq); \
545 __netif_tx_unlock(txq); \
548 static int virtnet_xdp_xmit(struct net_device *dev,
549 int n, struct xdp_frame **frames, u32 flags)
551 struct virtnet_info *vi = netdev_priv(dev);
552 struct receive_queue *rq = vi->rq;
553 struct bpf_prog *xdp_prog;
554 struct send_queue *sq;
564 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
565 * indicate XDP resources have been successfully allocated.
567 xdp_prog = rcu_access_pointer(rq->xdp_prog);
571 sq = virtnet_xdp_get_sq(vi);
573 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
579 /* Free up any pending old buffers before queueing new ones. */
580 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
581 if (likely(is_xdp_frame(ptr))) {
582 struct xdp_frame *frame = ptr_to_xdp(ptr);
585 xdp_return_frame(frame);
587 struct sk_buff *skb = ptr;
590 napi_consume_skb(skb, false);
595 for (i = 0; i < n; i++) {
596 struct xdp_frame *xdpf = frames[i];
598 err = __virtnet_xdp_xmit_one(vi, sq, xdpf);
600 xdp_return_frame_rx_napi(xdpf);
606 if (flags & XDP_XMIT_FLUSH) {
607 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
611 u64_stats_update_begin(&sq->stats.syncp);
612 sq->stats.bytes += bytes;
613 sq->stats.packets += packets;
614 sq->stats.xdp_tx += n;
615 sq->stats.xdp_tx_drops += drops;
616 sq->stats.kicks += kicks;
617 u64_stats_update_end(&sq->stats.syncp);
619 virtnet_xdp_put_sq(vi, sq);
623 static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
625 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0;
628 /* We copy the packet for XDP in the following cases:
630 * 1) Packet is scattered across multiple rx buffers.
631 * 2) Headroom space is insufficient.
633 * This is inefficient but it's a temporary condition that
634 * we hit right after XDP is enabled and until queue is refilled
635 * with large buffers with sufficient headroom - so it should affect
636 * at most queue size packets.
637 * Afterwards, the conditions to enable
638 * XDP should preclude the underlying device from sending packets
639 * across multiple buffers (num_buf > 1), and we make sure buffers
640 * have enough headroom.
642 static struct page *xdp_linearize_page(struct receive_queue *rq,
649 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
652 if (page_off + *len + tailroom > PAGE_SIZE)
655 page = alloc_page(GFP_ATOMIC);
659 memcpy(page_address(page) + page_off, page_address(p) + offset, *len);
667 buf = virtqueue_get_buf(rq->vq, &buflen);
671 p = virt_to_head_page(buf);
672 off = buf - page_address(p);
674 /* guard against a misconfigured or uncooperative backend that
675 * is sending packet larger than the MTU.
677 if ((page_off + buflen + tailroom) > PAGE_SIZE) {
682 memcpy(page_address(page) + page_off,
683 page_address(p) + off, buflen);
688 /* Headroom does not contribute to packet length */
689 *len = page_off - VIRTIO_XDP_HEADROOM;
692 __free_pages(page, 0);
696 static struct sk_buff *receive_small(struct net_device *dev,
697 struct virtnet_info *vi,
698 struct receive_queue *rq,
699 void *buf, void *ctx,
701 unsigned int *xdp_xmit,
702 struct virtnet_rq_stats *stats)
705 struct bpf_prog *xdp_prog;
706 unsigned int xdp_headroom = (unsigned long)ctx;
707 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom;
708 unsigned int headroom = vi->hdr_len + header_offset;
709 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
710 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
711 struct page *page = virt_to_head_page(buf);
712 unsigned int delta = 0;
713 struct page *xdp_page;
715 unsigned int metasize = 0;
720 if (unlikely(len > GOOD_PACKET_LEN)) {
721 pr_debug("%s: rx error: len %u exceeds max size %d\n",
722 dev->name, len, GOOD_PACKET_LEN);
723 dev->stats.rx_length_errors++;
727 xdp_prog = rcu_dereference(rq->xdp_prog);
729 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset;
730 struct xdp_frame *xdpf;
735 if (unlikely(hdr->hdr.gso_type))
738 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
739 int offset = buf - page_address(page) + header_offset;
740 unsigned int tlen = len + vi->hdr_len;
743 xdp_headroom = virtnet_get_headroom(vi);
744 header_offset = VIRTNET_RX_PAD + xdp_headroom;
745 headroom = vi->hdr_len + header_offset;
746 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
747 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
748 xdp_page = xdp_linearize_page(rq, &num_buf, page,
749 offset, header_offset,
754 buf = page_address(xdp_page);
759 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
760 xdp.data = xdp.data_hard_start + xdp_headroom;
761 xdp.data_end = xdp.data + len;
762 xdp.data_meta = xdp.data;
763 xdp.rxq = &rq->xdp_rxq;
764 xdp.frame_sz = buflen;
765 orig_data = xdp.data;
766 act = bpf_prog_run_xdp(xdp_prog, &xdp);
767 stats->xdp_packets++;
771 /* Recalculate length in case bpf program changed it */
772 delta = orig_data - xdp.data;
773 len = xdp.data_end - xdp.data;
774 metasize = xdp.data - xdp.data_meta;
778 xdpf = xdp_convert_buff_to_frame(&xdp);
781 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
782 if (unlikely(err < 0)) {
783 trace_xdp_exception(vi->dev, xdp_prog, act);
786 *xdp_xmit |= VIRTIO_XDP_TX;
790 stats->xdp_redirects++;
791 err = xdp_do_redirect(dev, &xdp, xdp_prog);
794 *xdp_xmit |= VIRTIO_XDP_REDIR;
798 bpf_warn_invalid_xdp_action(act);
801 trace_xdp_exception(vi->dev, xdp_prog, act);
808 skb = build_skb(buf, buflen);
813 skb_reserve(skb, headroom - delta);
816 buf += header_offset;
817 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
818 } /* keep zeroed vnet hdr since XDP is loaded */
821 skb_metadata_set(skb, metasize);
836 static struct sk_buff *receive_big(struct net_device *dev,
837 struct virtnet_info *vi,
838 struct receive_queue *rq,
841 struct virtnet_rq_stats *stats)
843 struct page *page = buf;
844 struct sk_buff *skb =
845 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0);
847 stats->bytes += len - vi->hdr_len;
855 give_pages(rq, page);
859 static struct sk_buff *receive_mergeable(struct net_device *dev,
860 struct virtnet_info *vi,
861 struct receive_queue *rq,
865 unsigned int *xdp_xmit,
866 struct virtnet_rq_stats *stats)
868 struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
869 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
870 struct page *page = virt_to_head_page(buf);
871 int offset = buf - page_address(page);
872 struct sk_buff *head_skb, *curr_skb;
873 struct bpf_prog *xdp_prog;
874 unsigned int truesize = mergeable_ctx_to_truesize(ctx);
875 unsigned int headroom = mergeable_ctx_to_headroom(ctx);
876 unsigned int metasize = 0;
877 unsigned int frame_sz;
881 stats->bytes += len - vi->hdr_len;
883 if (unlikely(len > truesize)) {
884 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
885 dev->name, len, (unsigned long)ctx);
886 dev->stats.rx_length_errors++;
890 xdp_prog = rcu_dereference(rq->xdp_prog);
892 struct xdp_frame *xdpf;
893 struct page *xdp_page;
898 /* Transient failure which in theory could occur if
899 * in-flight packets from before XDP was enabled reach
900 * the receive path after XDP is loaded.
902 if (unlikely(hdr->hdr.gso_type))
905 /* Buffers with headroom use PAGE_SIZE as alloc size,
906 * see add_recvbuf_mergeable() + get_mergeable_buf_len()
908 frame_sz = headroom ? PAGE_SIZE : truesize;
910 /* This happens when rx buffer size is underestimated
911 * or headroom is not enough because of the buffer
912 * was refilled before XDP is set. This should only
913 * happen for the first several packets, so we don't
914 * care much about its performance.
916 if (unlikely(num_buf > 1 ||
917 headroom < virtnet_get_headroom(vi))) {
918 /* linearize data for XDP */
919 xdp_page = xdp_linearize_page(rq, &num_buf,
923 frame_sz = PAGE_SIZE;
927 offset = VIRTIO_XDP_HEADROOM;
932 /* Allow consuming headroom but reserve enough space to push
933 * the descriptor on if we get an XDP_TX return code.
935 data = page_address(xdp_page) + offset;
936 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
937 xdp.data = data + vi->hdr_len;
938 xdp.data_end = xdp.data + (len - vi->hdr_len);
939 xdp.data_meta = xdp.data;
940 xdp.rxq = &rq->xdp_rxq;
941 xdp.frame_sz = frame_sz - vi->hdr_len;
943 act = bpf_prog_run_xdp(xdp_prog, &xdp);
944 stats->xdp_packets++;
948 metasize = xdp.data - xdp.data_meta;
950 /* recalculate offset to account for any header
951 * adjustments and minus the metasize to copy the
952 * metadata in page_to_skb(). Note other cases do not
953 * build an skb and avoid using offset
955 offset = xdp.data - page_address(xdp_page) -
956 vi->hdr_len - metasize;
958 /* recalculate len if xdp.data, xdp.data_end or
959 * xdp.data_meta were adjusted
961 len = xdp.data_end - xdp.data + vi->hdr_len + metasize;
962 /* We can only create skb based on xdp_page. */
963 if (unlikely(xdp_page != page)) {
966 head_skb = page_to_skb(vi, rq, xdp_page, offset,
967 len, PAGE_SIZE, false,
974 xdpf = xdp_convert_buff_to_frame(&xdp);
975 if (unlikely(!xdpf)) {
976 if (unlikely(xdp_page != page))
980 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
981 if (unlikely(err < 0)) {
982 trace_xdp_exception(vi->dev, xdp_prog, act);
983 if (unlikely(xdp_page != page))
987 *xdp_xmit |= VIRTIO_XDP_TX;
988 if (unlikely(xdp_page != page))
993 stats->xdp_redirects++;
994 err = xdp_do_redirect(dev, &xdp, xdp_prog);
996 if (unlikely(xdp_page != page))
1000 *xdp_xmit |= VIRTIO_XDP_REDIR;
1001 if (unlikely(xdp_page != page))
1006 bpf_warn_invalid_xdp_action(act);
1009 trace_xdp_exception(vi->dev, xdp_prog, act);
1012 if (unlikely(xdp_page != page))
1013 __free_pages(xdp_page, 0);
1019 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
1021 curr_skb = head_skb;
1023 if (unlikely(!curr_skb))
1028 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx);
1029 if (unlikely(!buf)) {
1030 pr_debug("%s: rx error: %d buffers out of %d missing\n",
1032 virtio16_to_cpu(vi->vdev,
1034 dev->stats.rx_length_errors++;
1038 stats->bytes += len;
1039 page = virt_to_head_page(buf);
1041 truesize = mergeable_ctx_to_truesize(ctx);
1042 if (unlikely(len > truesize)) {
1043 pr_debug("%s: rx error: len %u exceeds truesize %lu\n",
1044 dev->name, len, (unsigned long)ctx);
1045 dev->stats.rx_length_errors++;
1049 num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
1050 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
1051 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
1053 if (unlikely(!nskb))
1055 if (curr_skb == head_skb)
1056 skb_shinfo(curr_skb)->frag_list = nskb;
1058 curr_skb->next = nskb;
1060 head_skb->truesize += nskb->truesize;
1063 if (curr_skb != head_skb) {
1064 head_skb->data_len += len;
1065 head_skb->len += len;
1066 head_skb->truesize += truesize;
1068 offset = buf - page_address(page);
1069 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
1071 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
1074 skb_add_rx_frag(curr_skb, num_skb_frags, page,
1075 offset, len, truesize);
1079 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len);
1087 while (num_buf-- > 1) {
1088 buf = virtqueue_get_buf(rq->vq, &len);
1089 if (unlikely(!buf)) {
1090 pr_debug("%s: rx error: %d buffers missing\n",
1091 dev->name, num_buf);
1092 dev->stats.rx_length_errors++;
1095 stats->bytes += len;
1096 page = virt_to_head_page(buf);
1101 dev_kfree_skb(head_skb);
1106 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
1107 void *buf, unsigned int len, void **ctx,
1108 unsigned int *xdp_xmit,
1109 struct virtnet_rq_stats *stats)
1111 struct net_device *dev = vi->dev;
1112 struct sk_buff *skb;
1113 struct virtio_net_hdr_mrg_rxbuf *hdr;
1115 if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
1116 pr_debug("%s: short packet %i\n", dev->name, len);
1117 dev->stats.rx_length_errors++;
1118 if (vi->mergeable_rx_bufs) {
1119 put_page(virt_to_head_page(buf));
1120 } else if (vi->big_packets) {
1121 give_pages(rq, buf);
1123 put_page(virt_to_head_page(buf));
1128 if (vi->mergeable_rx_bufs)
1129 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
1131 else if (vi->big_packets)
1132 skb = receive_big(dev, vi, rq, buf, len, stats);
1134 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
1139 hdr = skb_vnet_hdr(skb);
1141 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID)
1142 skb->ip_summed = CHECKSUM_UNNECESSARY;
1144 if (virtio_net_hdr_to_skb(skb, &hdr->hdr,
1145 virtio_is_little_endian(vi->vdev))) {
1146 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n",
1147 dev->name, hdr->hdr.gso_type,
1152 skb_record_rx_queue(skb, vq2rxq(rq->vq));
1153 skb->protocol = eth_type_trans(skb, dev);
1154 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
1155 ntohs(skb->protocol), skb->len, skb->pkt_type);
1157 napi_gro_receive(&rq->napi, skb);
1161 dev->stats.rx_frame_errors++;
1165 /* Unlike mergeable buffers, all buffers are allocated to the
1166 * same size, except for the headroom. For this reason we do
1167 * not need to use mergeable_len_to_ctx here - it is enough
1168 * to store the headroom as the context ignoring the truesize.
1170 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
1173 struct page_frag *alloc_frag = &rq->alloc_frag;
1175 unsigned int xdp_headroom = virtnet_get_headroom(vi);
1176 void *ctx = (void *)(unsigned long)xdp_headroom;
1177 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;
1180 len = SKB_DATA_ALIGN(len) +
1181 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1182 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
1185 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1186 get_page(alloc_frag->page);
1187 alloc_frag->offset += len;
1188 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,
1189 vi->hdr_len + GOOD_PACKET_LEN);
1190 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1192 put_page(virt_to_head_page(buf));
1196 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
1199 struct page *first, *list = NULL;
1203 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
1205 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
1206 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
1207 first = get_a_page(rq, gfp);
1210 give_pages(rq, list);
1213 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
1215 /* chain new page in list head to match sg */
1216 first->private = (unsigned long)list;
1220 first = get_a_page(rq, gfp);
1222 give_pages(rq, list);
1225 p = page_address(first);
1227 /* rq->sg[0], rq->sg[1] share the same page */
1228 /* a separated rq->sg[0] for header - required in case !any_header_sg */
1229 sg_set_buf(&rq->sg[0], p, vi->hdr_len);
1231 /* rq->sg[1] for data packet, from offset */
1232 offset = sizeof(struct padded_vnet_hdr);
1233 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
1235 /* chain first in list head */
1236 first->private = (unsigned long)list;
1237 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
1240 give_pages(rq, first);
1245 static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
1246 struct ewma_pkt_len *avg_pkt_len,
1249 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1253 return PAGE_SIZE - room;
1255 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len),
1256 rq->min_buf_len, PAGE_SIZE - hdr_len);
1258 return ALIGN(len, L1_CACHE_BYTES);
1261 static int add_recvbuf_mergeable(struct virtnet_info *vi,
1262 struct receive_queue *rq, gfp_t gfp)
1264 struct page_frag *alloc_frag = &rq->alloc_frag;
1265 unsigned int headroom = virtnet_get_headroom(vi);
1266 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
1267 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
1271 unsigned int len, hole;
1273 /* Extra tailroom is needed to satisfy XDP's assumption. This
1274 * means rx frags coalescing won't work, but consider we've
1275 * disabled GSO for XDP, it won't be a big issue.
1277 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
1278 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp)))
1281 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
1282 buf += headroom; /* advance address leaving hole at front of pkt */
1283 get_page(alloc_frag->page);
1284 alloc_frag->offset += len + room;
1285 hole = alloc_frag->size - alloc_frag->offset;
1286 if (hole < len + room) {
1287 /* To avoid internal fragmentation, if there is very likely not
1288 * enough space for another buffer, add the remaining space to
1289 * the current buffer.
1292 alloc_frag->offset += hole;
1295 sg_init_one(rq->sg, buf, len);
1296 ctx = mergeable_len_to_ctx(len, headroom);
1297 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
1299 put_page(virt_to_head_page(buf));
1305 * Returns false if we couldn't fill entirely (OOM).
1307 * Normally run in the receive path, but can also be run from ndo_open
1308 * before we're receiving packets, or from refill_work which is
1309 * careful to disable receiving (using napi_disable).
1311 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
1318 if (vi->mergeable_rx_bufs)
1319 err = add_recvbuf_mergeable(vi, rq, gfp);
1320 else if (vi->big_packets)
1321 err = add_recvbuf_big(vi, rq, gfp);
1323 err = add_recvbuf_small(vi, rq, gfp);
1325 oom = err == -ENOMEM;
1328 } while (rq->vq->num_free);
1329 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
1330 unsigned long flags;
1332 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
1334 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
1340 static void skb_recv_done(struct virtqueue *rvq)
1342 struct virtnet_info *vi = rvq->vdev->priv;
1343 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
1345 virtqueue_napi_schedule(&rq->napi, rvq);
1348 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi)
1352 /* If all buffers were filled by other side before we napi_enabled, we
1353 * won't get another interrupt, so process any outstanding packets now.
1354 * Call local_bh_enable after to trigger softIRQ processing.
1357 virtqueue_napi_schedule(napi, vq);
1361 static void virtnet_napi_tx_enable(struct virtnet_info *vi,
1362 struct virtqueue *vq,
1363 struct napi_struct *napi)
1368 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only
1369 * enable the feature if this is likely affine with the transmit path.
1371 if (!vi->affinity_hint_set) {
1376 return virtnet_napi_enable(vq, napi);
1379 static void virtnet_napi_tx_disable(struct napi_struct *napi)
1385 static void refill_work(struct work_struct *work)
1387 struct virtnet_info *vi =
1388 container_of(work, struct virtnet_info, refill.work);
1392 for (i = 0; i < vi->curr_queue_pairs; i++) {
1393 struct receive_queue *rq = &vi->rq[i];
1395 napi_disable(&rq->napi);
1396 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
1397 virtnet_napi_enable(rq->vq, &rq->napi);
1399 /* In theory, this can happen: if we don't get any buffers in
1400 * we will *never* try to fill again.
1403 schedule_delayed_work(&vi->refill, HZ/2);
1407 static int virtnet_receive(struct receive_queue *rq, int budget,
1408 unsigned int *xdp_xmit)
1410 struct virtnet_info *vi = rq->vq->vdev->priv;
1411 struct virtnet_rq_stats stats = {};
1416 if (!vi->big_packets || vi->mergeable_rx_bufs) {
1419 while (stats.packets < budget &&
1420 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
1421 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
1425 while (stats.packets < budget &&
1426 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
1427 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
1432 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
1433 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
1434 spin_lock(&vi->refill_lock);
1435 if (vi->refill_enabled)
1436 schedule_delayed_work(&vi->refill, 0);
1437 spin_unlock(&vi->refill_lock);
1441 u64_stats_update_begin(&rq->stats.syncp);
1442 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
1443 size_t offset = virtnet_rq_stats_desc[i].offset;
1446 item = (u64 *)((u8 *)&rq->stats + offset);
1447 *item += *(u64 *)((u8 *)&stats + offset);
1449 u64_stats_update_end(&rq->stats.syncp);
1451 return stats.packets;
1454 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
1457 unsigned int packets = 0;
1458 unsigned int bytes = 0;
1461 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
1462 if (likely(!is_xdp_frame(ptr))) {
1463 struct sk_buff *skb = ptr;
1465 pr_debug("Sent skb %p\n", skb);
1468 napi_consume_skb(skb, in_napi);
1470 struct xdp_frame *frame = ptr_to_xdp(ptr);
1472 bytes += frame->len;
1473 xdp_return_frame(frame);
1478 /* Avoid overhead when no packets have been processed
1479 * happens when called speculatively from start_xmit.
1484 u64_stats_update_begin(&sq->stats.syncp);
1485 sq->stats.bytes += bytes;
1486 sq->stats.packets += packets;
1487 u64_stats_update_end(&sq->stats.syncp);
1490 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
1492 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs))
1494 else if (q < vi->curr_queue_pairs)
1500 static void virtnet_poll_cleantx(struct receive_queue *rq)
1502 struct virtnet_info *vi = rq->vq->vdev->priv;
1503 unsigned int index = vq2rxq(rq->vq);
1504 struct send_queue *sq = &vi->sq[index];
1505 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index);
1507 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index))
1510 if (__netif_tx_trylock(txq)) {
1511 free_old_xmit_skbs(sq, true);
1512 __netif_tx_unlock(txq);
1515 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1516 netif_tx_wake_queue(txq);
1519 static int virtnet_poll(struct napi_struct *napi, int budget)
1521 struct receive_queue *rq =
1522 container_of(napi, struct receive_queue, napi);
1523 struct virtnet_info *vi = rq->vq->vdev->priv;
1524 struct send_queue *sq;
1525 unsigned int received;
1526 unsigned int xdp_xmit = 0;
1528 virtnet_poll_cleantx(rq);
1530 received = virtnet_receive(rq, budget, &xdp_xmit);
1532 if (xdp_xmit & VIRTIO_XDP_REDIR)
1535 /* Out of packets? */
1536 if (received < budget)
1537 virtqueue_napi_complete(napi, rq->vq, received);
1539 if (xdp_xmit & VIRTIO_XDP_TX) {
1540 sq = virtnet_xdp_get_sq(vi);
1541 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1542 u64_stats_update_begin(&sq->stats.syncp);
1544 u64_stats_update_end(&sq->stats.syncp);
1546 virtnet_xdp_put_sq(vi, sq);
1552 static int virtnet_open(struct net_device *dev)
1554 struct virtnet_info *vi = netdev_priv(dev);
1557 enable_delayed_refill(vi);
1559 for (i = 0; i < vi->max_queue_pairs; i++) {
1560 if (i < vi->curr_queue_pairs)
1561 /* Make sure we have some buffers: if oom use wq. */
1562 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
1563 schedule_delayed_work(&vi->refill, 0);
1565 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i);
1569 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
1570 MEM_TYPE_PAGE_SHARED, NULL);
1572 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1576 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
1577 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
1583 static int virtnet_poll_tx(struct napi_struct *napi, int budget)
1585 struct send_queue *sq = container_of(napi, struct send_queue, napi);
1586 struct virtnet_info *vi = sq->vq->vdev->priv;
1587 unsigned int index = vq2txq(sq->vq);
1588 struct netdev_queue *txq;
1592 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
1593 /* We don't need to enable cb for XDP */
1594 napi_complete_done(napi, 0);
1598 txq = netdev_get_tx_queue(vi->dev, index);
1599 __netif_tx_lock(txq, raw_smp_processor_id());
1600 virtqueue_disable_cb(sq->vq);
1601 free_old_xmit_skbs(sq, true);
1603 opaque = virtqueue_enable_cb_prepare(sq->vq);
1605 done = napi_complete_done(napi, 0);
1608 virtqueue_disable_cb(sq->vq);
1610 __netif_tx_unlock(txq);
1613 if (unlikely(virtqueue_poll(sq->vq, opaque))) {
1614 if (napi_schedule_prep(napi)) {
1615 __netif_tx_lock(txq, raw_smp_processor_id());
1616 virtqueue_disable_cb(sq->vq);
1617 __netif_tx_unlock(txq);
1618 __napi_schedule(napi);
1623 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
1624 netif_tx_wake_queue(txq);
1629 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
1631 struct virtio_net_hdr_mrg_rxbuf *hdr;
1632 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
1633 struct virtnet_info *vi = sq->vq->vdev->priv;
1635 unsigned hdr_len = vi->hdr_len;
1638 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
1640 can_push = vi->any_header_sg &&
1641 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
1642 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
1643 /* Even if we can, don't push here yet as this would skew
1644 * csum_start offset below. */
1646 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
1648 hdr = skb_vnet_hdr(skb);
1650 if (virtio_net_hdr_from_skb(skb, &hdr->hdr,
1651 virtio_is_little_endian(vi->vdev), false,
1655 if (vi->mergeable_rx_bufs)
1656 hdr->num_buffers = 0;
1658 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
1660 __skb_push(skb, hdr_len);
1661 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
1662 if (unlikely(num_sg < 0))
1664 /* Pull header back to avoid skew in tx bytes calculations. */
1665 __skb_pull(skb, hdr_len);
1667 sg_set_buf(sq->sg, hdr, hdr_len);
1668 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
1669 if (unlikely(num_sg < 0))
1673 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
1676 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
1678 struct virtnet_info *vi = netdev_priv(dev);
1679 int qnum = skb_get_queue_mapping(skb);
1680 struct send_queue *sq = &vi->sq[qnum];
1682 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
1683 bool kick = !netdev_xmit_more();
1684 bool use_napi = sq->napi.weight;
1686 /* Free up any pending old buffers before queueing new ones. */
1687 free_old_xmit_skbs(sq, false);
1689 if (use_napi && kick)
1690 virtqueue_enable_cb_delayed(sq->vq);
1692 /* timestamp packet in software */
1693 skb_tx_timestamp(skb);
1695 /* Try to transmit */
1696 err = xmit_skb(sq, skb);
1698 /* This should not happen! */
1699 if (unlikely(err)) {
1700 dev->stats.tx_fifo_errors++;
1701 if (net_ratelimit())
1703 "Unexpected TXQ (%d) queue failure: %d\n",
1705 dev->stats.tx_dropped++;
1706 dev_kfree_skb_any(skb);
1707 return NETDEV_TX_OK;
1710 /* Don't wait up for transmitted skbs to be freed. */
1716 /* If running out of space, stop queue to avoid getting packets that we
1717 * are then unable to transmit.
1718 * An alternative would be to force queuing layer to requeue the skb by
1719 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
1720 * returned in a normal path of operation: it means that driver is not
1721 * maintaining the TX queue stop/start state properly, and causes
1722 * the stack to do a non-trivial amount of useless work.
1723 * Since most packets only take 1 or 2 ring slots, stopping the queue
1724 * early means 16 slots are typically wasted.
1726 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
1727 netif_stop_subqueue(dev, qnum);
1729 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
1730 /* More just got used, free them then recheck. */
1731 free_old_xmit_skbs(sq, false);
1732 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
1733 netif_start_subqueue(dev, qnum);
1734 virtqueue_disable_cb(sq->vq);
1739 if (kick || netif_xmit_stopped(txq)) {
1740 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
1741 u64_stats_update_begin(&sq->stats.syncp);
1743 u64_stats_update_end(&sq->stats.syncp);
1747 return NETDEV_TX_OK;
1751 * Send command via the control virtqueue and check status. Commands
1752 * supported by the hypervisor, as indicated by feature bits, should
1753 * never fail unless improperly formatted.
1755 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
1756 struct scatterlist *out)
1758 struct scatterlist *sgs[4], hdr, stat;
1759 unsigned out_num = 0, tmp;
1761 /* Caller should know better */
1762 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
1764 vi->ctrl->status = ~0;
1765 vi->ctrl->hdr.class = class;
1766 vi->ctrl->hdr.cmd = cmd;
1768 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr));
1769 sgs[out_num++] = &hdr;
1772 sgs[out_num++] = out;
1774 /* Add return status. */
1775 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
1776 sgs[out_num] = &stat;
1778 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
1779 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
1781 if (unlikely(!virtqueue_kick(vi->cvq)))
1782 return vi->ctrl->status == VIRTIO_NET_OK;
1784 /* Spin for a response, the kick causes an ioport write, trapping
1785 * into the hypervisor, so the request should be handled immediately.
1787 while (!virtqueue_get_buf(vi->cvq, &tmp) &&
1788 !virtqueue_is_broken(vi->cvq))
1791 return vi->ctrl->status == VIRTIO_NET_OK;
1794 static int virtnet_set_mac_address(struct net_device *dev, void *p)
1796 struct virtnet_info *vi = netdev_priv(dev);
1797 struct virtio_device *vdev = vi->vdev;
1799 struct sockaddr *addr;
1800 struct scatterlist sg;
1802 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
1805 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL);
1809 ret = eth_prepare_mac_addr_change(dev, addr);
1813 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
1814 sg_init_one(&sg, addr->sa_data, dev->addr_len);
1815 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
1816 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
1817 dev_warn(&vdev->dev,
1818 "Failed to set mac address by vq command.\n");
1822 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
1823 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1826 /* Naturally, this has an atomicity problem. */
1827 for (i = 0; i < dev->addr_len; i++)
1828 virtio_cwrite8(vdev,
1829 offsetof(struct virtio_net_config, mac) +
1830 i, addr->sa_data[i]);
1833 eth_commit_mac_addr_change(dev, p);
1841 static void virtnet_stats(struct net_device *dev,
1842 struct rtnl_link_stats64 *tot)
1844 struct virtnet_info *vi = netdev_priv(dev);
1848 for (i = 0; i < vi->max_queue_pairs; i++) {
1849 u64 tpackets, tbytes, rpackets, rbytes, rdrops;
1850 struct receive_queue *rq = &vi->rq[i];
1851 struct send_queue *sq = &vi->sq[i];
1854 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
1855 tpackets = sq->stats.packets;
1856 tbytes = sq->stats.bytes;
1857 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
1860 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
1861 rpackets = rq->stats.packets;
1862 rbytes = rq->stats.bytes;
1863 rdrops = rq->stats.drops;
1864 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
1866 tot->rx_packets += rpackets;
1867 tot->tx_packets += tpackets;
1868 tot->rx_bytes += rbytes;
1869 tot->tx_bytes += tbytes;
1870 tot->rx_dropped += rdrops;
1873 tot->tx_dropped = dev->stats.tx_dropped;
1874 tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
1875 tot->rx_length_errors = dev->stats.rx_length_errors;
1876 tot->rx_frame_errors = dev->stats.rx_frame_errors;
1879 static void virtnet_ack_link_announce(struct virtnet_info *vi)
1882 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
1883 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
1884 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
1888 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1890 struct scatterlist sg;
1891 struct net_device *dev = vi->dev;
1893 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
1896 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
1897 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
1899 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
1900 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
1901 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
1905 vi->curr_queue_pairs = queue_pairs;
1906 /* virtnet_open() will refill when device is going to up. */
1907 if (dev->flags & IFF_UP)
1908 schedule_delayed_work(&vi->refill, 0);
1914 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
1919 err = _virtnet_set_queues(vi, queue_pairs);
1924 static int virtnet_close(struct net_device *dev)
1926 struct virtnet_info *vi = netdev_priv(dev);
1929 /* Make sure NAPI doesn't schedule refill work */
1930 disable_delayed_refill(vi);
1931 /* Make sure refill_work doesn't re-enable napi! */
1932 cancel_delayed_work_sync(&vi->refill);
1934 for (i = 0; i < vi->max_queue_pairs; i++) {
1935 napi_disable(&vi->rq[i].napi);
1936 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
1937 virtnet_napi_tx_disable(&vi->sq[i].napi);
1943 static void virtnet_set_rx_mode(struct net_device *dev)
1945 struct virtnet_info *vi = netdev_priv(dev);
1946 struct scatterlist sg[2];
1947 struct virtio_net_ctrl_mac *mac_data;
1948 struct netdev_hw_addr *ha;
1954 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
1955 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
1958 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
1959 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
1961 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
1963 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1964 VIRTIO_NET_CTRL_RX_PROMISC, sg))
1965 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
1966 vi->ctrl->promisc ? "en" : "dis");
1968 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
1970 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
1971 VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
1972 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
1973 vi->ctrl->allmulti ? "en" : "dis");
1975 uc_count = netdev_uc_count(dev);
1976 mc_count = netdev_mc_count(dev);
1977 /* MAC filter - use one buffer for both lists */
1978 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
1979 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
1984 sg_init_table(sg, 2);
1986 /* Store the unicast list and count in the front of the buffer */
1987 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
1989 netdev_for_each_uc_addr(ha, dev)
1990 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
1992 sg_set_buf(&sg[0], mac_data,
1993 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
1995 /* multicast list and count fill the end */
1996 mac_data = (void *)&mac_data->macs[uc_count][0];
1998 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
2000 netdev_for_each_mc_addr(ha, dev)
2001 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
2003 sg_set_buf(&sg[1], mac_data,
2004 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
2006 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
2007 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
2008 dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
2013 static int virtnet_vlan_rx_add_vid(struct net_device *dev,
2014 __be16 proto, u16 vid)
2016 struct virtnet_info *vi = netdev_priv(dev);
2017 struct scatterlist sg;
2019 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2020 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2022 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2023 VIRTIO_NET_CTRL_VLAN_ADD, &sg))
2024 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
2028 static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
2029 __be16 proto, u16 vid)
2031 struct virtnet_info *vi = netdev_priv(dev);
2032 struct scatterlist sg;
2034 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
2035 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
2037 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
2038 VIRTIO_NET_CTRL_VLAN_DEL, &sg))
2039 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
2043 static void virtnet_clean_affinity(struct virtnet_info *vi)
2047 if (vi->affinity_hint_set) {
2048 for (i = 0; i < vi->max_queue_pairs; i++) {
2049 virtqueue_set_affinity(vi->rq[i].vq, NULL);
2050 virtqueue_set_affinity(vi->sq[i].vq, NULL);
2053 vi->affinity_hint_set = false;
2057 static void virtnet_set_affinity(struct virtnet_info *vi)
2066 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
2067 virtnet_clean_affinity(vi);
2071 num_cpu = num_online_cpus();
2072 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
2073 stragglers = num_cpu >= vi->curr_queue_pairs ?
2074 num_cpu % vi->curr_queue_pairs :
2076 cpu = cpumask_next(-1, cpu_online_mask);
2078 for (i = 0; i < vi->curr_queue_pairs; i++) {
2079 group_size = stride + (i < stragglers ? 1 : 0);
2081 for (j = 0; j < group_size; j++) {
2082 cpumask_set_cpu(cpu, mask);
2083 cpu = cpumask_next_wrap(cpu, cpu_online_mask,
2086 virtqueue_set_affinity(vi->rq[i].vq, mask);
2087 virtqueue_set_affinity(vi->sq[i].vq, mask);
2088 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false);
2089 cpumask_clear(mask);
2092 vi->affinity_hint_set = true;
2093 free_cpumask_var(mask);
2096 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node)
2098 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2100 virtnet_set_affinity(vi);
2104 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node)
2106 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2108 virtnet_set_affinity(vi);
2112 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
2114 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info,
2117 virtnet_clean_affinity(vi);
2121 static enum cpuhp_state virtionet_online;
2123 static int virtnet_cpu_notif_add(struct virtnet_info *vi)
2127 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node);
2130 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2134 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2138 static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
2140 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node);
2141 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD,
2145 static void virtnet_get_ringparam(struct net_device *dev,
2146 struct ethtool_ringparam *ring)
2148 struct virtnet_info *vi = netdev_priv(dev);
2150 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
2151 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
2152 ring->rx_pending = ring->rx_max_pending;
2153 ring->tx_pending = ring->tx_max_pending;
2157 static void virtnet_get_drvinfo(struct net_device *dev,
2158 struct ethtool_drvinfo *info)
2160 struct virtnet_info *vi = netdev_priv(dev);
2161 struct virtio_device *vdev = vi->vdev;
2163 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
2164 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
2165 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
2169 /* TODO: Eliminate OOO packets during switching */
2170 static int virtnet_set_channels(struct net_device *dev,
2171 struct ethtool_channels *channels)
2173 struct virtnet_info *vi = netdev_priv(dev);
2174 u16 queue_pairs = channels->combined_count;
2177 /* We don't support separate rx/tx channels.
2178 * We don't allow setting 'other' channels.
2180 if (channels->rx_count || channels->tx_count || channels->other_count)
2183 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
2186 /* For now we don't support modifying channels while XDP is loaded
2187 * also when XDP is loaded all RX queues have XDP programs so we only
2188 * need to check a single RX queue.
2190 if (vi->rq[0].xdp_prog)
2194 err = _virtnet_set_queues(vi, queue_pairs);
2199 virtnet_set_affinity(vi);
2202 netif_set_real_num_tx_queues(dev, queue_pairs);
2203 netif_set_real_num_rx_queues(dev, queue_pairs);
2208 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
2210 struct virtnet_info *vi = netdev_priv(dev);
2211 char *p = (char *)data;
2214 switch (stringset) {
2216 for (i = 0; i < vi->curr_queue_pairs; i++) {
2217 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2218 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s",
2219 i, virtnet_rq_stats_desc[j].desc);
2220 p += ETH_GSTRING_LEN;
2224 for (i = 0; i < vi->curr_queue_pairs; i++) {
2225 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2226 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s",
2227 i, virtnet_sq_stats_desc[j].desc);
2228 p += ETH_GSTRING_LEN;
2235 static int virtnet_get_sset_count(struct net_device *dev, int sset)
2237 struct virtnet_info *vi = netdev_priv(dev);
2241 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
2242 VIRTNET_SQ_STATS_LEN);
2248 static void virtnet_get_ethtool_stats(struct net_device *dev,
2249 struct ethtool_stats *stats, u64 *data)
2251 struct virtnet_info *vi = netdev_priv(dev);
2252 unsigned int idx = 0, start, i, j;
2253 const u8 *stats_base;
2256 for (i = 0; i < vi->curr_queue_pairs; i++) {
2257 struct receive_queue *rq = &vi->rq[i];
2259 stats_base = (u8 *)&rq->stats;
2261 start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
2262 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
2263 offset = virtnet_rq_stats_desc[j].offset;
2264 data[idx + j] = *(u64 *)(stats_base + offset);
2266 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
2267 idx += VIRTNET_RQ_STATS_LEN;
2270 for (i = 0; i < vi->curr_queue_pairs; i++) {
2271 struct send_queue *sq = &vi->sq[i];
2273 stats_base = (u8 *)&sq->stats;
2275 start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
2276 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
2277 offset = virtnet_sq_stats_desc[j].offset;
2278 data[idx + j] = *(u64 *)(stats_base + offset);
2280 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
2281 idx += VIRTNET_SQ_STATS_LEN;
2285 static void virtnet_get_channels(struct net_device *dev,
2286 struct ethtool_channels *channels)
2288 struct virtnet_info *vi = netdev_priv(dev);
2290 channels->combined_count = vi->curr_queue_pairs;
2291 channels->max_combined = vi->max_queue_pairs;
2292 channels->max_other = 0;
2293 channels->rx_count = 0;
2294 channels->tx_count = 0;
2295 channels->other_count = 0;
2298 static int virtnet_set_link_ksettings(struct net_device *dev,
2299 const struct ethtool_link_ksettings *cmd)
2301 struct virtnet_info *vi = netdev_priv(dev);
2303 return ethtool_virtdev_set_link_ksettings(dev, cmd,
2304 &vi->speed, &vi->duplex);
2307 static int virtnet_get_link_ksettings(struct net_device *dev,
2308 struct ethtool_link_ksettings *cmd)
2310 struct virtnet_info *vi = netdev_priv(dev);
2312 cmd->base.speed = vi->speed;
2313 cmd->base.duplex = vi->duplex;
2314 cmd->base.port = PORT_OTHER;
2319 static int virtnet_set_coalesce(struct net_device *dev,
2320 struct ethtool_coalesce *ec)
2322 struct virtnet_info *vi = netdev_priv(dev);
2325 if (ec->tx_max_coalesced_frames > 1 ||
2326 ec->rx_max_coalesced_frames != 1)
2329 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
2330 if (napi_weight ^ vi->sq[0].napi.weight) {
2331 if (dev->flags & IFF_UP)
2333 for (i = 0; i < vi->max_queue_pairs; i++)
2334 vi->sq[i].napi.weight = napi_weight;
2340 static int virtnet_get_coalesce(struct net_device *dev,
2341 struct ethtool_coalesce *ec)
2343 struct ethtool_coalesce ec_default = {
2344 .cmd = ETHTOOL_GCOALESCE,
2345 .rx_max_coalesced_frames = 1,
2347 struct virtnet_info *vi = netdev_priv(dev);
2349 memcpy(ec, &ec_default, sizeof(ec_default));
2351 if (vi->sq[0].napi.weight)
2352 ec->tx_max_coalesced_frames = 1;
2357 static void virtnet_init_settings(struct net_device *dev)
2359 struct virtnet_info *vi = netdev_priv(dev);
2361 vi->speed = SPEED_UNKNOWN;
2362 vi->duplex = DUPLEX_UNKNOWN;
2365 static void virtnet_update_settings(struct virtnet_info *vi)
2370 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
2373 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
2375 if (ethtool_validate_speed(speed))
2378 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
2380 if (ethtool_validate_duplex(duplex))
2381 vi->duplex = duplex;
2384 static const struct ethtool_ops virtnet_ethtool_ops = {
2385 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
2386 .get_drvinfo = virtnet_get_drvinfo,
2387 .get_link = ethtool_op_get_link,
2388 .get_ringparam = virtnet_get_ringparam,
2389 .get_strings = virtnet_get_strings,
2390 .get_sset_count = virtnet_get_sset_count,
2391 .get_ethtool_stats = virtnet_get_ethtool_stats,
2392 .set_channels = virtnet_set_channels,
2393 .get_channels = virtnet_get_channels,
2394 .get_ts_info = ethtool_op_get_ts_info,
2395 .get_link_ksettings = virtnet_get_link_ksettings,
2396 .set_link_ksettings = virtnet_set_link_ksettings,
2397 .set_coalesce = virtnet_set_coalesce,
2398 .get_coalesce = virtnet_get_coalesce,
2401 static void virtnet_freeze_down(struct virtio_device *vdev)
2403 struct virtnet_info *vi = vdev->priv;
2405 /* Make sure no work handler is accessing the device */
2406 flush_work(&vi->config_work);
2408 netif_tx_lock_bh(vi->dev);
2409 netif_device_detach(vi->dev);
2410 netif_tx_unlock_bh(vi->dev);
2411 if (netif_running(vi->dev))
2412 virtnet_close(vi->dev);
2415 static int init_vqs(struct virtnet_info *vi);
2417 static int virtnet_restore_up(struct virtio_device *vdev)
2419 struct virtnet_info *vi = vdev->priv;
2426 virtio_device_ready(vdev);
2428 enable_delayed_refill(vi);
2430 if (netif_running(vi->dev)) {
2431 err = virtnet_open(vi->dev);
2436 netif_tx_lock_bh(vi->dev);
2437 netif_device_attach(vi->dev);
2438 netif_tx_unlock_bh(vi->dev);
2442 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
2444 struct scatterlist sg;
2445 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
2447 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
2449 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
2450 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
2451 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
2458 static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
2462 if (!vi->guest_offloads)
2465 return virtnet_set_guest_offloads(vi, offloads);
2468 static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
2470 u64 offloads = vi->guest_offloads;
2472 if (!vi->guest_offloads)
2475 return virtnet_set_guest_offloads(vi, offloads);
2478 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
2479 struct netlink_ext_ack *extack)
2481 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr);
2482 struct virtnet_info *vi = netdev_priv(dev);
2483 struct bpf_prog *old_prog;
2484 u16 xdp_qp = 0, curr_qp;
2487 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)
2488 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
2489 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
2490 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
2491 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) ||
2492 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
2493 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first");
2497 if (vi->mergeable_rx_bufs && !vi->any_header_sg) {
2498 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required");
2502 if (dev->mtu > max_sz) {
2503 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP");
2504 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz);
2508 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs;
2510 xdp_qp = nr_cpu_ids;
2512 /* XDP requires extra queues for XDP_TX */
2513 if (curr_qp + xdp_qp > vi->max_queue_pairs) {
2514 netdev_warn(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
2515 curr_qp + xdp_qp, vi->max_queue_pairs);
2519 old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
2520 if (!prog && !old_prog)
2524 bpf_prog_add(prog, vi->max_queue_pairs - 1);
2526 /* Make sure NAPI is not using any XDP TX queues for RX. */
2527 if (netif_running(dev)) {
2528 for (i = 0; i < vi->max_queue_pairs; i++) {
2529 napi_disable(&vi->rq[i].napi);
2530 virtnet_napi_tx_disable(&vi->sq[i].napi);
2535 for (i = 0; i < vi->max_queue_pairs; i++) {
2536 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2538 virtnet_restore_guest_offloads(vi);
2543 err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
2546 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
2547 vi->xdp_queue_pairs = xdp_qp;
2550 vi->xdp_enabled = true;
2551 for (i = 0; i < vi->max_queue_pairs; i++) {
2552 rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
2553 if (i == 0 && !old_prog)
2554 virtnet_clear_guest_offloads(vi);
2557 vi->xdp_enabled = false;
2560 for (i = 0; i < vi->max_queue_pairs; i++) {
2562 bpf_prog_put(old_prog);
2563 if (netif_running(dev)) {
2564 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2565 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2574 virtnet_clear_guest_offloads(vi);
2575 for (i = 0; i < vi->max_queue_pairs; i++)
2576 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
2579 if (netif_running(dev)) {
2580 for (i = 0; i < vi->max_queue_pairs; i++) {
2581 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
2582 virtnet_napi_tx_enable(vi, vi->sq[i].vq,
2587 bpf_prog_sub(prog, vi->max_queue_pairs - 1);
2591 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
2593 switch (xdp->command) {
2594 case XDP_SETUP_PROG:
2595 return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
2601 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
2604 struct virtnet_info *vi = netdev_priv(dev);
2607 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
2610 ret = snprintf(buf, len, "sby");
2617 static int virtnet_set_features(struct net_device *dev,
2618 netdev_features_t features)
2620 struct virtnet_info *vi = netdev_priv(dev);
2624 if ((dev->features ^ features) & NETIF_F_GRO_HW) {
2625 if (vi->xdp_enabled)
2628 if (features & NETIF_F_GRO_HW)
2629 offloads = vi->guest_offloads_capable;
2631 offloads = vi->guest_offloads_capable &
2632 ~GUEST_OFFLOAD_GRO_HW_MASK;
2634 err = virtnet_set_guest_offloads(vi, offloads);
2637 vi->guest_offloads = offloads;
2643 static const struct net_device_ops virtnet_netdev = {
2644 .ndo_open = virtnet_open,
2645 .ndo_stop = virtnet_close,
2646 .ndo_start_xmit = start_xmit,
2647 .ndo_validate_addr = eth_validate_addr,
2648 .ndo_set_mac_address = virtnet_set_mac_address,
2649 .ndo_set_rx_mode = virtnet_set_rx_mode,
2650 .ndo_get_stats64 = virtnet_stats,
2651 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
2652 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
2653 .ndo_bpf = virtnet_xdp,
2654 .ndo_xdp_xmit = virtnet_xdp_xmit,
2655 .ndo_features_check = passthru_features_check,
2656 .ndo_get_phys_port_name = virtnet_get_phys_port_name,
2657 .ndo_set_features = virtnet_set_features,
2660 static void virtnet_config_changed_work(struct work_struct *work)
2662 struct virtnet_info *vi =
2663 container_of(work, struct virtnet_info, config_work);
2666 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
2667 struct virtio_net_config, status, &v) < 0)
2670 if (v & VIRTIO_NET_S_ANNOUNCE) {
2671 netdev_notify_peers(vi->dev);
2672 virtnet_ack_link_announce(vi);
2675 /* Ignore unknown (future) status bits */
2676 v &= VIRTIO_NET_S_LINK_UP;
2678 if (vi->status == v)
2683 if (vi->status & VIRTIO_NET_S_LINK_UP) {
2684 virtnet_update_settings(vi);
2685 netif_carrier_on(vi->dev);
2686 netif_tx_wake_all_queues(vi->dev);
2688 netif_carrier_off(vi->dev);
2689 netif_tx_stop_all_queues(vi->dev);
2693 static void virtnet_config_changed(struct virtio_device *vdev)
2695 struct virtnet_info *vi = vdev->priv;
2697 schedule_work(&vi->config_work);
2700 static void virtnet_free_queues(struct virtnet_info *vi)
2704 for (i = 0; i < vi->max_queue_pairs; i++) {
2705 __netif_napi_del(&vi->rq[i].napi);
2706 __netif_napi_del(&vi->sq[i].napi);
2709 /* We called __netif_napi_del(),
2710 * we need to respect an RCU grace period before freeing vi->rq
2719 static void _free_receive_bufs(struct virtnet_info *vi)
2721 struct bpf_prog *old_prog;
2724 for (i = 0; i < vi->max_queue_pairs; i++) {
2725 while (vi->rq[i].pages)
2726 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
2728 old_prog = rtnl_dereference(vi->rq[i].xdp_prog);
2729 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL);
2731 bpf_prog_put(old_prog);
2735 static void free_receive_bufs(struct virtnet_info *vi)
2738 _free_receive_bufs(vi);
2742 static void free_receive_page_frags(struct virtnet_info *vi)
2745 for (i = 0; i < vi->max_queue_pairs; i++)
2746 if (vi->rq[i].alloc_frag.page)
2747 put_page(vi->rq[i].alloc_frag.page);
2750 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
2752 if (!is_xdp_frame(buf))
2755 xdp_return_frame(ptr_to_xdp(buf));
2758 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf)
2760 struct virtnet_info *vi = vq->vdev->priv;
2763 if (vi->mergeable_rx_bufs)
2764 put_page(virt_to_head_page(buf));
2765 else if (vi->big_packets)
2766 give_pages(&vi->rq[i], buf);
2768 put_page(virt_to_head_page(buf));
2771 static void free_unused_bufs(struct virtnet_info *vi)
2776 for (i = 0; i < vi->max_queue_pairs; i++) {
2777 struct virtqueue *vq = vi->sq[i].vq;
2778 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
2779 virtnet_sq_free_unused_buf(vq, buf);
2783 for (i = 0; i < vi->max_queue_pairs; i++) {
2784 struct virtqueue *vq = vi->rq[i].vq;
2785 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
2786 virtnet_rq_free_unused_buf(vq, buf);
2791 static void virtnet_del_vqs(struct virtnet_info *vi)
2793 struct virtio_device *vdev = vi->vdev;
2795 virtnet_clean_affinity(vi);
2797 vdev->config->del_vqs(vdev);
2799 virtnet_free_queues(vi);
2802 /* How large should a single buffer be so a queue full of these can fit at
2803 * least one full packet?
2804 * Logic below assumes the mergeable buffer header is used.
2806 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
2808 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2809 unsigned int rq_size = virtqueue_get_vring_size(vq);
2810 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
2811 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
2812 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
2814 return max(max(min_buf_len, hdr_len) - hdr_len,
2815 (unsigned int)GOOD_PACKET_LEN);
2818 static int virtnet_find_vqs(struct virtnet_info *vi)
2820 vq_callback_t **callbacks;
2821 struct virtqueue **vqs;
2828 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
2829 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
2830 * possible control vq.
2832 total_vqs = vi->max_queue_pairs * 2 +
2833 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
2835 /* Allocate space for find_vqs parameters */
2836 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
2839 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
2842 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
2845 if (!vi->big_packets || vi->mergeable_rx_bufs) {
2846 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL);
2853 /* Parameters for control virtqueue, if any */
2855 callbacks[total_vqs - 1] = NULL;
2856 names[total_vqs - 1] = "control";
2859 /* Allocate/initialize parameters for send/receive virtqueues */
2860 for (i = 0; i < vi->max_queue_pairs; i++) {
2861 callbacks[rxq2vq(i)] = skb_recv_done;
2862 callbacks[txq2vq(i)] = skb_xmit_done;
2863 sprintf(vi->rq[i].name, "input.%u", i);
2864 sprintf(vi->sq[i].name, "output.%u", i);
2865 names[rxq2vq(i)] = vi->rq[i].name;
2866 names[txq2vq(i)] = vi->sq[i].name;
2868 ctx[rxq2vq(i)] = true;
2871 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
2877 vi->cvq = vqs[total_vqs - 1];
2878 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
2879 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2882 for (i = 0; i < vi->max_queue_pairs; i++) {
2883 vi->rq[i].vq = vqs[rxq2vq(i)];
2884 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq);
2885 vi->sq[i].vq = vqs[txq2vq(i)];
2888 /* run here: ret == 0. */
2903 static int virtnet_alloc_queues(struct virtnet_info *vi)
2907 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
2910 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
2913 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL);
2917 INIT_DELAYED_WORK(&vi->refill, refill_work);
2918 for (i = 0; i < vi->max_queue_pairs; i++) {
2919 vi->rq[i].pages = NULL;
2920 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
2922 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
2923 napi_tx ? napi_weight : 0);
2925 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
2926 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
2927 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
2929 u64_stats_init(&vi->rq[i].stats.syncp);
2930 u64_stats_init(&vi->sq[i].stats.syncp);
2943 static int init_vqs(struct virtnet_info *vi)
2947 /* Allocate send & receive queues */
2948 ret = virtnet_alloc_queues(vi);
2952 ret = virtnet_find_vqs(vi);
2957 virtnet_set_affinity(vi);
2963 virtnet_free_queues(vi);
2969 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
2972 struct virtnet_info *vi = netdev_priv(queue->dev);
2973 unsigned int queue_index = get_netdev_rx_queue_index(queue);
2974 unsigned int headroom = virtnet_get_headroom(vi);
2975 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
2976 struct ewma_pkt_len *avg;
2978 BUG_ON(queue_index >= vi->max_queue_pairs);
2979 avg = &vi->rq[queue_index].mrg_avg_pkt_len;
2980 return sprintf(buf, "%u\n",
2981 get_mergeable_buf_len(&vi->rq[queue_index], avg,
2982 SKB_DATA_ALIGN(headroom + tailroom)));
2985 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
2986 __ATTR_RO(mergeable_rx_buffer_size);
2988 static struct attribute *virtio_net_mrg_rx_attrs[] = {
2989 &mergeable_rx_buffer_size_attribute.attr,
2993 static const struct attribute_group virtio_net_mrg_rx_group = {
2994 .name = "virtio_net",
2995 .attrs = virtio_net_mrg_rx_attrs
2999 static bool virtnet_fail_on_feature(struct virtio_device *vdev,
3001 const char *fname, const char *dname)
3003 if (!virtio_has_feature(vdev, fbit))
3006 dev_err(&vdev->dev, "device advertises feature %s but not %s",
3012 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
3013 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
3015 static bool virtnet_validate_features(struct virtio_device *vdev)
3017 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
3018 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
3019 "VIRTIO_NET_F_CTRL_VQ") ||
3020 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
3021 "VIRTIO_NET_F_CTRL_VQ") ||
3022 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
3023 "VIRTIO_NET_F_CTRL_VQ") ||
3024 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
3025 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
3026 "VIRTIO_NET_F_CTRL_VQ"))) {
3033 #define MIN_MTU ETH_MIN_MTU
3034 #define MAX_MTU ETH_MAX_MTU
3036 static int virtnet_validate(struct virtio_device *vdev)
3038 if (!vdev->config->get) {
3039 dev_err(&vdev->dev, "%s failure: config access disabled\n",
3044 if (!virtnet_validate_features(vdev))
3047 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3048 int mtu = virtio_cread16(vdev,
3049 offsetof(struct virtio_net_config,
3052 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
3058 static int virtnet_probe(struct virtio_device *vdev)
3060 int i, err = -ENOMEM;
3061 struct net_device *dev;
3062 struct virtnet_info *vi;
3063 u16 max_queue_pairs;
3066 /* Find if host supports multiqueue virtio_net device */
3067 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
3068 struct virtio_net_config,
3069 max_virtqueue_pairs, &max_queue_pairs);
3071 /* We need at least 2 queue's */
3072 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
3073 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
3074 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3075 max_queue_pairs = 1;
3077 /* Allocate ourselves a network device with room for our info */
3078 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
3082 /* Set up network device as normal. */
3083 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
3084 dev->netdev_ops = &virtnet_netdev;
3085 dev->features = NETIF_F_HIGHDMA;
3087 dev->ethtool_ops = &virtnet_ethtool_ops;
3088 SET_NETDEV_DEV(dev, &vdev->dev);
3090 /* Do we support "hardware" checksums? */
3091 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
3092 /* This opens up the world of extra features. */
3093 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3095 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
3097 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
3098 dev->hw_features |= NETIF_F_TSO
3099 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
3101 /* Individual feature bits: what can host handle? */
3102 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
3103 dev->hw_features |= NETIF_F_TSO;
3104 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
3105 dev->hw_features |= NETIF_F_TSO6;
3106 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
3107 dev->hw_features |= NETIF_F_TSO_ECN;
3109 dev->features |= NETIF_F_GSO_ROBUST;
3112 dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
3113 /* (!csum && gso) case will be fixed by register_netdev() */
3115 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
3116 dev->features |= NETIF_F_RXCSUM;
3117 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3118 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
3119 dev->features |= NETIF_F_GRO_HW;
3120 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
3121 dev->hw_features |= NETIF_F_GRO_HW;
3123 dev->vlan_features = dev->features;
3125 /* MTU range: 68 - 65535 */
3126 dev->min_mtu = MIN_MTU;
3127 dev->max_mtu = MAX_MTU;
3129 /* Configuration may specify what MAC to use. Otherwise random. */
3130 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
3131 virtio_cread_bytes(vdev,
3132 offsetof(struct virtio_net_config, mac),
3133 dev->dev_addr, dev->addr_len);
3135 eth_hw_addr_random(dev);
3137 /* Set up our device-specific information */
3138 vi = netdev_priv(dev);
3143 INIT_WORK(&vi->config_work, virtnet_config_changed_work);
3144 spin_lock_init(&vi->refill_lock);
3146 /* If we can receive ANY GSO packets, we must allocate large ones. */
3147 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
3148 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
3149 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
3150 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
3151 vi->big_packets = true;
3153 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
3154 vi->mergeable_rx_bufs = true;
3156 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
3157 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3158 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
3160 vi->hdr_len = sizeof(struct virtio_net_hdr);
3162 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
3163 virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
3164 vi->any_header_sg = true;
3166 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
3169 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
3170 mtu = virtio_cread16(vdev,
3171 offsetof(struct virtio_net_config,
3173 if (mtu < dev->min_mtu) {
3174 /* Should never trigger: MTU was previously validated
3175 * in virtnet_validate.
3178 "device MTU appears to have changed it is now %d < %d",
3187 /* TODO: size buffers correctly in this case. */
3188 if (dev->mtu > ETH_DATA_LEN)
3189 vi->big_packets = true;
3192 if (vi->any_header_sg)
3193 dev->needed_headroom = vi->hdr_len;
3195 /* Enable multiqueue by default */
3196 if (num_online_cpus() >= max_queue_pairs)
3197 vi->curr_queue_pairs = max_queue_pairs;
3199 vi->curr_queue_pairs = num_online_cpus();
3200 vi->max_queue_pairs = max_queue_pairs;
3202 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
3208 if (vi->mergeable_rx_bufs)
3209 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
3211 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
3212 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
3214 virtnet_init_settings(dev);
3216 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3217 vi->failover = net_failover_create(vi->dev);
3218 if (IS_ERR(vi->failover)) {
3219 err = PTR_ERR(vi->failover);
3224 /* serialize netdev register + virtio_device_ready() with ndo_open() */
3227 err = register_netdevice(dev);
3229 pr_debug("virtio_net: registering device failed\n");
3234 virtio_device_ready(vdev);
3236 _virtnet_set_queues(vi, vi->curr_queue_pairs);
3240 err = virtnet_cpu_notif_add(vi);
3242 pr_debug("virtio_net: registering cpu notifier failed\n");
3243 goto free_unregister_netdev;
3246 /* Assume link up if device can't report link status,
3247 otherwise get link status from config. */
3248 netif_carrier_off(dev);
3249 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
3250 schedule_work(&vi->config_work);
3252 vi->status = VIRTIO_NET_S_LINK_UP;
3253 virtnet_update_settings(vi);
3254 netif_carrier_on(dev);
3257 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
3258 if (virtio_has_feature(vi->vdev, guest_offloads[i]))
3259 set_bit(guest_offloads[i], &vi->guest_offloads);
3260 vi->guest_offloads_capable = vi->guest_offloads;
3262 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
3263 dev->name, max_queue_pairs);
3267 free_unregister_netdev:
3268 vi->vdev->config->reset(vdev);
3270 unregister_netdev(dev);
3272 net_failover_destroy(vi->failover);
3274 cancel_delayed_work_sync(&vi->refill);
3275 free_receive_page_frags(vi);
3276 virtnet_del_vqs(vi);
3282 static void remove_vq_common(struct virtnet_info *vi)
3284 vi->vdev->config->reset(vi->vdev);
3286 /* Free unused buffers in both send and recv, if any. */
3287 free_unused_bufs(vi);
3289 free_receive_bufs(vi);
3291 free_receive_page_frags(vi);
3293 virtnet_del_vqs(vi);
3296 static void virtnet_remove(struct virtio_device *vdev)
3298 struct virtnet_info *vi = vdev->priv;
3300 virtnet_cpu_notif_remove(vi);
3302 /* Make sure no work handler is accessing the device. */
3303 flush_work(&vi->config_work);
3305 unregister_netdev(vi->dev);
3307 net_failover_destroy(vi->failover);
3309 remove_vq_common(vi);
3311 free_netdev(vi->dev);
3314 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev)
3316 struct virtnet_info *vi = vdev->priv;
3318 virtnet_cpu_notif_remove(vi);
3319 virtnet_freeze_down(vdev);
3320 remove_vq_common(vi);
3325 static __maybe_unused int virtnet_restore(struct virtio_device *vdev)
3327 struct virtnet_info *vi = vdev->priv;
3330 err = virtnet_restore_up(vdev);
3333 virtnet_set_queues(vi, vi->curr_queue_pairs);
3335 err = virtnet_cpu_notif_add(vi);
3337 virtnet_freeze_down(vdev);
3338 remove_vq_common(vi);
3345 static struct virtio_device_id id_table[] = {
3346 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
3350 #define VIRTNET_FEATURES \
3351 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \
3353 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \
3354 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \
3355 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \
3356 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \
3357 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \
3358 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \
3359 VIRTIO_NET_F_CTRL_MAC_ADDR, \
3360 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
3361 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY
3363 static unsigned int features[] = {
3367 static unsigned int features_legacy[] = {
3370 VIRTIO_F_ANY_LAYOUT,
3373 static struct virtio_driver virtio_net_driver = {
3374 .feature_table = features,
3375 .feature_table_size = ARRAY_SIZE(features),
3376 .feature_table_legacy = features_legacy,
3377 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
3378 .driver.name = KBUILD_MODNAME,
3379 .driver.owner = THIS_MODULE,
3380 .id_table = id_table,
3381 .validate = virtnet_validate,
3382 .probe = virtnet_probe,
3383 .remove = virtnet_remove,
3384 .config_changed = virtnet_config_changed,
3385 #ifdef CONFIG_PM_SLEEP
3386 .freeze = virtnet_freeze,
3387 .restore = virtnet_restore,
3391 static __init int virtio_net_driver_init(void)
3395 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online",
3397 virtnet_cpu_down_prep);
3400 virtionet_online = ret;
3401 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead",
3402 NULL, virtnet_cpu_dead);
3406 ret = register_virtio_driver(&virtio_net_driver);
3411 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3413 cpuhp_remove_multi_state(virtionet_online);
3417 module_init(virtio_net_driver_init);
3419 static __exit void virtio_net_driver_exit(void)
3421 unregister_virtio_driver(&virtio_net_driver);
3422 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
3423 cpuhp_remove_multi_state(virtionet_online);
3425 module_exit(virtio_net_driver_exit);
3427 MODULE_DEVICE_TABLE(virtio, id_table);
3428 MODULE_DESCRIPTION("Virtio network driver");
3429 MODULE_LICENSE("GPL");