--- /dev/null
+/* A network driver using virtio.
+ *
+ * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+//#define DEBUG
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/module.h>
+#include <linux/virtio.h>
+#include <linux/virtio_net.h>
+#include <linux/scatterlist.h>
+#include <linux/if_vlan.h>
+#include <linux/slab.h>
+#include <linux/cpu.h>
+#include <linux/average.h>
+#include <net/busy_poll.h>
+
+static int napi_weight = NAPI_POLL_WEIGHT;
+module_param(napi_weight, int, 0444);
+
+static bool csum = true, gso = true;
+module_param(csum, bool, 0444);
+module_param(gso, bool, 0444);
+
+/* FIXME: MTU in config. */
+#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
+#define GOOD_COPY_LEN 128
+
+/* Weight used for the RX packet size EWMA. The average packet size is used to
+ * determine the packet buffer size when refilling RX rings. As the entire RX
+ * ring may be refilled at once, the weight is chosen so that the EWMA will be
+ * insensitive to short-term, transient changes in packet size.
+ */
+#define RECEIVE_AVG_WEIGHT 64
+
+/* Minimum alignment for mergeable packet buffers. */
+#define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256)
+
+#define VIRTNET_DRIVER_VERSION "1.0.0"
+
+struct virtnet_stats {
+ struct u64_stats_sync tx_syncp;
+ struct u64_stats_sync rx_syncp;
+ u64 tx_bytes;
+ u64 tx_packets;
+
+ u64 rx_bytes;
+ u64 rx_packets;
+};
+
+/* Internal representation of a send virtqueue */
+struct send_queue {
+ /* Virtqueue associated with this send _queue */
+ struct virtqueue *vq;
+
+ /* TX: fragments + linear part + virtio header */
+ struct scatterlist sg[MAX_SKB_FRAGS + 2];
+
+ /* Name of the send queue: output.$index */
+ char name[40];
+};
+
+/* Internal representation of a receive virtqueue */
+struct receive_queue {
+ /* Virtqueue associated with this receive_queue */
+ struct virtqueue *vq;
+
+ struct napi_struct napi;
+
+ /* Chain pages by the private ptr. */
+ struct page *pages;
+
+ /* Average packet length for mergeable receive buffers. */
+ struct ewma mrg_avg_pkt_len;
+
+ /* Page frag for packet buffer allocation. */
+ struct page_frag alloc_frag;
+
+ /* RX: fragments + linear part + virtio header */
+ struct scatterlist sg[MAX_SKB_FRAGS + 2];
+
+ /* Name of this receive queue: input.$index */
+ char name[40];
+};
+
+struct virtnet_info {
+ struct virtio_device *vdev;
+ struct virtqueue *cvq;
+ struct net_device *dev;
+ struct send_queue *sq;
+ struct receive_queue *rq;
+ unsigned int status;
+
+ /* Max # of queue pairs supported by the device */
+ u16 max_queue_pairs;
+
+ /* # of queue pairs currently used by the driver */
+ u16 curr_queue_pairs;
+
+ /* I like... big packets and I cannot lie! */
+ bool big_packets;
+
+ /* Host will merge rx buffers for big packets (shake it! shake it!) */
+ bool mergeable_rx_bufs;
+
+ /* Has control virtqueue */
+ bool has_cvq;
+
+ /* Host can handle any s/g split between our header and packet data */
+ bool any_header_sg;
+
+ /* Packet virtio header size */
+ u8 hdr_len;
+
+ /* Active statistics */
+ struct virtnet_stats __percpu *stats;
+
+ /* Work struct for refilling if we run low on memory. */
+ struct delayed_work refill;
+
+ /* Work struct for config space updates */
+ struct work_struct config_work;
+
+ /* Does the affinity hint is set for virtqueues? */
+ bool affinity_hint_set;
+
+ /* CPU hot plug notifier */
+ struct notifier_block nb;
+};
+
+struct padded_vnet_hdr {
+ struct virtio_net_hdr_mrg_rxbuf hdr;
+ /*
+ * hdr is in a separate sg buffer, and data sg buffer shares same page
+ * with this header sg. This padding makes next sg 16 byte aligned
+ * after the header.
+ */
+ char padding[4];
+};
+
+/* Converting between virtqueue no. and kernel tx/rx queue no.
+ * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
+ */
+static int vq2txq(struct virtqueue *vq)
+{
+ return (vq->index - 1) / 2;
+}
+
+static int txq2vq(int txq)
+{
+ return txq * 2 + 1;
+}
+
+static int vq2rxq(struct virtqueue *vq)
+{
+ return vq->index / 2;
+}
+
+static int rxq2vq(int rxq)
+{
+ return rxq * 2;
+}
+
+static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
+{
+ return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
+}
+
+/*
+ * private is used to chain pages for big packets, put the whole
+ * most recent used list in the beginning for reuse
+ */
+static void give_pages(struct receive_queue *rq, struct page *page)
+{
+ struct page *end;
+
+ /* Find end of list, sew whole thing into vi->rq.pages. */
+ for (end = page; end->private; end = (struct page *)end->private);
+ end->private = (unsigned long)rq->pages;
+ rq->pages = page;
+}
+
+static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
+{
+ struct page *p = rq->pages;
+
+ if (p) {
+ rq->pages = (struct page *)p->private;
+ /* clear private here, it is used to chain pages */
+ p->private = 0;
+ } else
+ p = alloc_page(gfp_mask);
+ return p;
+}
+
+static void skb_xmit_done(struct virtqueue *vq)
+{
+ struct virtnet_info *vi = vq->vdev->priv;
+
+ /* Suppress further interrupts. */
+ virtqueue_disable_cb(vq);
+
+ /* We were probably waiting for more output buffers. */
+ netif_wake_subqueue(vi->dev, vq2txq(vq));
+}
+
+static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx)
+{
+ unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1);
+ return (truesize + 1) * MERGEABLE_BUFFER_ALIGN;
+}
+
+static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx)
+{
+ return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN);
+
+}
+
+static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize)
+{
+ unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN;
+ return (unsigned long)buf | (size - 1);
+}
+
+/* Called from bottom half context */
+static struct sk_buff *page_to_skb(struct virtnet_info *vi,
+ struct receive_queue *rq,
+ struct page *page, unsigned int offset,
+ unsigned int len, unsigned int truesize)
+{
+ struct sk_buff *skb;
+ struct virtio_net_hdr_mrg_rxbuf *hdr;
+ unsigned int copy, hdr_len, hdr_padded_len;
+ char *p;
+
+ p = page_address(page) + offset;
+
+ /* copy small packet so we can reuse these pages for small data */
+ skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
+ if (unlikely(!skb))
+ return NULL;
+
+ hdr = skb_vnet_hdr(skb);
+
+ hdr_len = vi->hdr_len;
+ if (vi->mergeable_rx_bufs)
+ hdr_padded_len = sizeof *hdr;
+ else
+ hdr_padded_len = sizeof(struct padded_vnet_hdr);
+
+ memcpy(hdr, p, hdr_len);
+
+ len -= hdr_len;
+ offset += hdr_padded_len;
+ p += hdr_padded_len;
+
+ copy = len;
+ if (copy > skb_tailroom(skb))
+ copy = skb_tailroom(skb);
+ memcpy(skb_put(skb, copy), p, copy);
+
+ len -= copy;
+ offset += copy;
+
+ if (vi->mergeable_rx_bufs) {
+ if (len)
+ skb_add_rx_frag(skb, 0, page, offset, len, truesize);
+ else
+ put_page(page);
+ return skb;
+ }
+
+ /*
+ * Verify that we can indeed put this data into a skb.
+ * This is here to handle cases when the device erroneously
+ * tries to receive more than is possible. This is usually
+ * the case of a broken device.
+ */
+ if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
+ net_dbg_ratelimited("%s: too much data\n", skb->dev->name);
+ dev_kfree_skb(skb);
+ return NULL;
+ }
+ BUG_ON(offset >= PAGE_SIZE);
+ while (len) {
+ unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len);
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset,
+ frag_size, truesize);
+ len -= frag_size;
+ page = (struct page *)page->private;
+ offset = 0;
+ }
+
+ if (page)
+ give_pages(rq, page);
+
+ return skb;
+}
+
+static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len)
+{
+ struct sk_buff * skb = buf;
+
+ len -= vi->hdr_len;
+ skb_trim(skb, len);
+
+ return skb;
+}
+
+static struct sk_buff *receive_big(struct net_device *dev,
+ struct virtnet_info *vi,
+ struct receive_queue *rq,
+ void *buf,
+ unsigned int len)
+{
+ struct page *page = buf;
+ struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE);
+
+ if (unlikely(!skb))
+ goto err;
+
+ return skb;
+
+err:
+ dev->stats.rx_dropped++;
+ give_pages(rq, page);
+ return NULL;
+}
+
+static struct sk_buff *receive_mergeable(struct net_device *dev,
+ struct virtnet_info *vi,
+ struct receive_queue *rq,
+ unsigned long ctx,
+ unsigned int len)
+{
+ void *buf = mergeable_ctx_to_buf_address(ctx);
+ struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
+ u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers);
+ struct page *page = virt_to_head_page(buf);
+ int offset = buf - page_address(page);
+ unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
+
+ struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len,
+ truesize);
+ struct sk_buff *curr_skb = head_skb;
+
+ if (unlikely(!curr_skb))
+ goto err_skb;
+ while (--num_buf) {
+ int num_skb_frags;
+
+ ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
+ if (unlikely(!ctx)) {
+ pr_debug("%s: rx error: %d buffers out of %d missing\n",
+ dev->name, num_buf,
+ virtio16_to_cpu(vi->vdev,
+ hdr->num_buffers));
+ dev->stats.rx_length_errors++;
+ goto err_buf;
+ }
+
+ buf = mergeable_ctx_to_buf_address(ctx);
+ page = virt_to_head_page(buf);
+
+ num_skb_frags = skb_shinfo(curr_skb)->nr_frags;
+ if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) {
+ struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC);
+
+ if (unlikely(!nskb))
+ goto err_skb;
+ if (curr_skb == head_skb)
+ skb_shinfo(curr_skb)->frag_list = nskb;
+ else
+ curr_skb->next = nskb;
+ curr_skb = nskb;
+ head_skb->truesize += nskb->truesize;
+ num_skb_frags = 0;
+ }
+ truesize = max(len, mergeable_ctx_to_buf_truesize(ctx));
+ if (curr_skb != head_skb) {
+ head_skb->data_len += len;
+ head_skb->len += len;
+ head_skb->truesize += truesize;
+ }
+ offset = buf - page_address(page);
+ if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) {
+ put_page(page);
+ skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1,
+ len, truesize);
+ } else {
+ skb_add_rx_frag(curr_skb, num_skb_frags, page,
+ offset, len, truesize);
+ }
+ }
+
+ ewma_add(&rq->mrg_avg_pkt_len, head_skb->len);
+ return head_skb;
+
+err_skb:
+ put_page(page);
+ while (--num_buf) {
+ ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len);
+ if (unlikely(!ctx)) {
+ pr_debug("%s: rx error: %d buffers missing\n",
+ dev->name, num_buf);
+ dev->stats.rx_length_errors++;
+ break;
+ }
+ page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx));
+ put_page(page);
+ }
+err_buf:
+ dev->stats.rx_dropped++;
+ dev_kfree_skb(head_skb);
+ return NULL;
+}
+
+static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
+ void *buf, unsigned int len)
+{
+ struct net_device *dev = vi->dev;
+ struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
+ struct sk_buff *skb;
+ struct virtio_net_hdr_mrg_rxbuf *hdr;
+
+ if (unlikely(len < vi->hdr_len + ETH_HLEN)) {
+ pr_debug("%s: short packet %i\n", dev->name, len);
+ dev->stats.rx_length_errors++;
+ if (vi->mergeable_rx_bufs) {
+ unsigned long ctx = (unsigned long)buf;
+ void *base = mergeable_ctx_to_buf_address(ctx);
+ put_page(virt_to_head_page(base));
+ } else if (vi->big_packets) {
+ give_pages(rq, buf);
+ } else {
+ dev_kfree_skb(buf);
+ }
+ return;
+ }
+
+ if (vi->mergeable_rx_bufs)
+ skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len);
+ else if (vi->big_packets)
+ skb = receive_big(dev, vi, rq, buf, len);
+ else
+ skb = receive_small(vi, buf, len);
+
+ if (unlikely(!skb))
+ return;
+
+ hdr = skb_vnet_hdr(skb);
+
+ u64_stats_update_begin(&stats->rx_syncp);
+ stats->rx_bytes += skb->len;
+ stats->rx_packets++;
+ u64_stats_update_end(&stats->rx_syncp);
+
+ if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
+ pr_debug("Needs csum!\n");
+ if (!skb_partial_csum_set(skb,
+ virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start),
+ virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset)))
+ goto frame_err;
+ } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ skb->protocol = eth_type_trans(skb, dev);
+ pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
+ ntohs(skb->protocol), skb->len, skb->pkt_type);
+
+ if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
+ pr_debug("GSO!\n");
+ switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
+ case VIRTIO_NET_HDR_GSO_TCPV4:
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+ break;
+ case VIRTIO_NET_HDR_GSO_UDP:
+ skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
+ break;
+ case VIRTIO_NET_HDR_GSO_TCPV6:
+ skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
+ break;
+ default:
+ net_warn_ratelimited("%s: bad gso type %u.\n",
+ dev->name, hdr->hdr.gso_type);
+ goto frame_err;
+ }
+
+ if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
+ skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
+
+ skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev,
+ hdr->hdr.gso_size);
+ if (skb_shinfo(skb)->gso_size == 0) {
+ net_warn_ratelimited("%s: zero gso size.\n", dev->name);
+ goto frame_err;
+ }
+
+ /* Header must be checked, and gso_segs computed. */
+ skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
+ skb_shinfo(skb)->gso_segs = 0;
+ }
+
+ skb_mark_napi_id(skb, &rq->napi);
+
+ netif_receive_skb(skb);
+ return;
+
+frame_err:
+ dev->stats.rx_frame_errors++;
+ dev_kfree_skb(skb);
+}
+
+static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
+ gfp_t gfp)
+{
+ struct sk_buff *skb;
+ struct virtio_net_hdr_mrg_rxbuf *hdr;
+ int err;
+
+ skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+ skb_put(skb, GOOD_PACKET_LEN);
+
+ hdr = skb_vnet_hdr(skb);
+ sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
+ sg_set_buf(rq->sg, hdr, vi->hdr_len);
+ skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
+
+ err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp);
+ if (err < 0)
+ dev_kfree_skb(skb);
+
+ return err;
+}
+
+static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq,
+ gfp_t gfp)
+{
+ struct page *first, *list = NULL;
+ char *p;
+ int i, err, offset;
+
+ sg_init_table(rq->sg, MAX_SKB_FRAGS + 2);
+
+ /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
+ for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
+ first = get_a_page(rq, gfp);
+ if (!first) {
+ if (list)
+ give_pages(rq, list);
+ return -ENOMEM;
+ }
+ sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
+
+ /* chain new page in list head to match sg */
+ first->private = (unsigned long)list;
+ list = first;
+ }
+
+ first = get_a_page(rq, gfp);
+ if (!first) {
+ give_pages(rq, list);
+ return -ENOMEM;
+ }
+ p = page_address(first);
+
+ /* rq->sg[0], rq->sg[1] share the same page */
+ /* a separated rq->sg[0] for header - required in case !any_header_sg */
+ sg_set_buf(&rq->sg[0], p, vi->hdr_len);
+
+ /* rq->sg[1] for data packet, from offset */
+ offset = sizeof(struct padded_vnet_hdr);
+ sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
+
+ /* chain first in list head */
+ first->private = (unsigned long)list;
+ err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
+ first, gfp);
+ if (err < 0)
+ give_pages(rq, first);
+
+ return err;
+}
+
+static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len)
+{
+ const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ unsigned int len;
+
+ len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len),
+ GOOD_PACKET_LEN, PAGE_SIZE - hdr_len);
+ return ALIGN(len, MERGEABLE_BUFFER_ALIGN);
+}
+
+static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp)
+{
+ struct page_frag *alloc_frag = &rq->alloc_frag;
+ char *buf;
+ unsigned long ctx;
+ int err;
+ unsigned int len, hole;
+
+ len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len);
+ if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp)))
+ return -ENOMEM;
+
+ buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset;
+ ctx = mergeable_buf_to_ctx(buf, len);
+ get_page(alloc_frag->page);
+ alloc_frag->offset += len;
+ hole = alloc_frag->size - alloc_frag->offset;
+ if (hole < len) {
+ /* To avoid internal fragmentation, if there is very likely not
+ * enough space for another buffer, add the remaining space to
+ * the current buffer. This extra space is not included in
+ * the truesize stored in ctx.
+ */
+ len += hole;
+ alloc_frag->offset += hole;
+ }
+
+ sg_init_one(rq->sg, buf, len);
+ err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp);
+ if (err < 0)
+ put_page(virt_to_head_page(buf));
+
+ return err;
+}
+
+/*
+ * Returns false if we couldn't fill entirely (OOM).
+ *
+ * Normally run in the receive path, but can also be run from ndo_open
+ * before we're receiving packets, or from refill_work which is
+ * careful to disable receiving (using napi_disable).
+ */
+static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
+ gfp_t gfp)
+{
+ int err;
+ bool oom;
+
+ gfp |= __GFP_COLD;
+ do {
+ if (vi->mergeable_rx_bufs)
+ err = add_recvbuf_mergeable(rq, gfp);
+ else if (vi->big_packets)
+ err = add_recvbuf_big(vi, rq, gfp);
+ else
+ err = add_recvbuf_small(vi, rq, gfp);
+
+ oom = err == -ENOMEM;
+ if (err)
+ break;
+ } while (rq->vq->num_free);
+ virtqueue_kick(rq->vq);
+ return !oom;
+}
+
+static void skb_recv_done(struct virtqueue *rvq)
+{
+ struct virtnet_info *vi = rvq->vdev->priv;
+ struct receive_queue *rq = &vi->rq[vq2rxq(rvq)];
+
+ /* Schedule NAPI, Suppress further interrupts if successful. */
+ if (napi_schedule_prep(&rq->napi)) {
+ virtqueue_disable_cb(rvq);
+ __napi_schedule(&rq->napi);
+ }
+}
+
+static void virtnet_napi_enable(struct receive_queue *rq)
+{
+ napi_enable(&rq->napi);
+
+ /* If all buffers were filled by other side before we napi_enabled, we
+ * won't get another interrupt, so process any outstanding packets
+ * now. virtnet_poll wants re-enable the queue, so we disable here.
+ * We synchronize against interrupts via NAPI_STATE_SCHED */
+ if (napi_schedule_prep(&rq->napi)) {
+ virtqueue_disable_cb(rq->vq);
+ local_bh_disable();
+ __napi_schedule(&rq->napi);
+ local_bh_enable();
+ }
+}
+
+static void refill_work(struct work_struct *work)
+{
+ struct virtnet_info *vi =
+ container_of(work, struct virtnet_info, refill.work);
+ bool still_empty;
+ int i;
+
+ for (i = 0; i < vi->curr_queue_pairs; i++) {
+ struct receive_queue *rq = &vi->rq[i];
+
+ napi_disable(&rq->napi);
+ still_empty = !try_fill_recv(vi, rq, GFP_KERNEL);
+ virtnet_napi_enable(rq);
+
+ /* In theory, this can happen: if we don't get any buffers in
+ * we will *never* try to fill again.
+ */
+ if (still_empty)
+ schedule_delayed_work(&vi->refill, HZ/2);
+ }
+}
+
+static int virtnet_receive(struct receive_queue *rq, int budget)
+{
+ struct virtnet_info *vi = rq->vq->vdev->priv;
+ unsigned int len, received = 0;
+ void *buf;
+
+ while (received < budget &&
+ (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
+ receive_buf(vi, rq, buf, len);
+ received++;
+ }
+
+ if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) {
+ if (!try_fill_recv(vi, rq, GFP_ATOMIC))
+ schedule_delayed_work(&vi->refill, 0);
+ }
+
+ return received;
+}
+
+static int virtnet_poll(struct napi_struct *napi, int budget)
+{
+ struct receive_queue *rq =
+ container_of(napi, struct receive_queue, napi);
+ unsigned int r, received;
+
+ received = virtnet_receive(rq, budget);
+
+ /* Out of packets? */
+ if (received < budget) {
+ r = virtqueue_enable_cb_prepare(rq->vq);
+ napi_complete(napi);
+ if (unlikely(virtqueue_poll(rq->vq, r)) &&
+ napi_schedule_prep(napi)) {
+ virtqueue_disable_cb(rq->vq);
+ __napi_schedule(napi);
+ }
+ }
+
+ return received;
+}
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+/* must be called with local_bh_disable()d */
+static int virtnet_busy_poll(struct napi_struct *napi)
+{
+ struct receive_queue *rq =
+ container_of(napi, struct receive_queue, napi);
+ struct virtnet_info *vi = rq->vq->vdev->priv;
+ int r, received = 0, budget = 4;
+
+ if (!(vi->status & VIRTIO_NET_S_LINK_UP))
+ return LL_FLUSH_FAILED;
+
+ if (!napi_schedule_prep(napi))
+ return LL_FLUSH_BUSY;
+
+ virtqueue_disable_cb(rq->vq);
+
+again:
+ received += virtnet_receive(rq, budget);
+
+ r = virtqueue_enable_cb_prepare(rq->vq);
+ clear_bit(NAPI_STATE_SCHED, &napi->state);
+ if (unlikely(virtqueue_poll(rq->vq, r)) &&
+ napi_schedule_prep(napi)) {
+ virtqueue_disable_cb(rq->vq);
+ if (received < budget) {
+ budget -= received;
+ goto again;
+ } else {
+ __napi_schedule(napi);
+ }
+ }
+
+ return received;
+}
+#endif /* CONFIG_NET_RX_BUSY_POLL */
+
+static int virtnet_open(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ if (i < vi->curr_queue_pairs)
+ /* Make sure we have some buffers: if oom use wq. */
+ if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
+ schedule_delayed_work(&vi->refill, 0);
+ virtnet_napi_enable(&vi->rq[i]);
+ }
+
+ return 0;
+}
+
+static void free_old_xmit_skbs(struct send_queue *sq)
+{
+ struct sk_buff *skb;
+ unsigned int len;
+ struct virtnet_info *vi = sq->vq->vdev->priv;
+ struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
+
+ while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) {
+ pr_debug("Sent skb %p\n", skb);
+
+ u64_stats_update_begin(&stats->tx_syncp);
+ stats->tx_bytes += skb->len;
+ stats->tx_packets++;
+ u64_stats_update_end(&stats->tx_syncp);
+
+ dev_kfree_skb_any(skb);
+ }
+}
+
+static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
+{
+ struct virtio_net_hdr_mrg_rxbuf *hdr;
+ const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
+ struct virtnet_info *vi = sq->vq->vdev->priv;
+ unsigned num_sg;
+ unsigned hdr_len = vi->hdr_len;
+ bool can_push;
+
+ pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
+
+ can_push = vi->any_header_sg &&
+ !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) &&
+ !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len;
+ /* Even if we can, don't push here yet as this would skew
+ * csum_start offset below. */
+ if (can_push)
+ hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len);
+ else
+ hdr = skb_vnet_hdr(skb);
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+ hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev,
+ skb_checksum_start_offset(skb));
+ hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev,
+ skb->csum_offset);
+ } else {
+ hdr->hdr.flags = 0;
+ hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
+ }
+
+ if (skb_is_gso(skb)) {
+ hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb));
+ hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev,
+ skb_shinfo(skb)->gso_size);
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
+ else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
+ else
+ BUG();
+ if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
+ hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
+ } else {
+ hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
+ hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
+ }
+
+ if (vi->mergeable_rx_bufs)
+ hdr->num_buffers = 0;
+
+ sg_init_table(sq->sg, MAX_SKB_FRAGS + 2);
+ if (can_push) {
+ __skb_push(skb, hdr_len);
+ num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
+ /* Pull header back to avoid skew in tx bytes calculations. */
+ __skb_pull(skb, hdr_len);
+ } else {
+ sg_set_buf(sq->sg, hdr, hdr_len);
+ num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
+ }
+ return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
+}
+
+static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int qnum = skb_get_queue_mapping(skb);
+ struct send_queue *sq = &vi->sq[qnum];
+ int err;
+ struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum);
+ bool kick = !skb->xmit_more;
+
+ /* Free up any pending old buffers before queueing new ones. */
+ free_old_xmit_skbs(sq);
+
+ /* timestamp packet in software */
+ skb_tx_timestamp(skb);
+
+ /* Try to transmit */
+ err = xmit_skb(sq, skb);
+
+ /* This should not happen! */
+ if (unlikely(err)) {
+ dev->stats.tx_fifo_errors++;
+ if (net_ratelimit())
+ dev_warn(&dev->dev,
+ "Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
+ dev->stats.tx_dropped++;
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+ }
+
+ /* Don't wait up for transmitted skbs to be freed. */
+ skb_orphan(skb);
+ nf_reset(skb);
+
+ /* If running out of space, stop queue to avoid getting packets that we
+ * are then unable to transmit.
+ * An alternative would be to force queuing layer to requeue the skb by
+ * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be
+ * returned in a normal path of operation: it means that driver is not
+ * maintaining the TX queue stop/start state properly, and causes
+ * the stack to do a non-trivial amount of useless work.
+ * Since most packets only take 1 or 2 ring slots, stopping the queue
+ * early means 16 slots are typically wasted.
+ */
+ if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
+ netif_stop_subqueue(dev, qnum);
+ if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
+ /* More just got used, free them then recheck. */
+ free_old_xmit_skbs(sq);
+ if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
+ netif_start_subqueue(dev, qnum);
+ virtqueue_disable_cb(sq->vq);
+ }
+ }
+ }
+
+ if (kick || netif_xmit_stopped(txq))
+ virtqueue_kick(sq->vq);
+
+ return NETDEV_TX_OK;
+}
+
+/*
+ * Send command via the control virtqueue and check status. Commands
+ * supported by the hypervisor, as indicated by feature bits, should
+ * never fail unless improperly formatted.
+ */
+static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
+ struct scatterlist *out)
+{
+ struct scatterlist *sgs[4], hdr, stat;
+ struct virtio_net_ctrl_hdr ctrl;
+ virtio_net_ctrl_ack status = ~0;
+ unsigned out_num = 0, tmp;
+
+ /* Caller should know better */
+ BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
+
+ ctrl.class = class;
+ ctrl.cmd = cmd;
+ /* Add header */
+ sg_init_one(&hdr, &ctrl, sizeof(ctrl));
+ sgs[out_num++] = &hdr;
+
+ if (out)
+ sgs[out_num++] = out;
+
+ /* Add return status. */
+ sg_init_one(&stat, &status, sizeof(status));
+ sgs[out_num] = &stat;
+
+ BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
+ virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
+
+ if (unlikely(!virtqueue_kick(vi->cvq)))
+ return status == VIRTIO_NET_OK;
+
+ /* Spin for a response, the kick causes an ioport write, trapping
+ * into the hypervisor, so the request should be handled immediately.
+ */
+ while (!virtqueue_get_buf(vi->cvq, &tmp) &&
+ !virtqueue_is_broken(vi->cvq))
+ cpu_relax();
+
+ return status == VIRTIO_NET_OK;
+}
+
+static int virtnet_set_mac_address(struct net_device *dev, void *p)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtio_device *vdev = vi->vdev;
+ int ret;
+ struct sockaddr *addr = p;
+ struct scatterlist sg;
+
+ ret = eth_prepare_mac_addr_change(dev, p);
+ if (ret)
+ return ret;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
+ sg_init_one(&sg, addr->sa_data, dev->addr_len);
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
+ VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
+ dev_warn(&vdev->dev,
+ "Failed to set mac address by vq command.\n");
+ return -EINVAL;
+ }
+ } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
+ !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
+ unsigned int i;
+
+ /* Naturally, this has an atomicity problem. */
+ for (i = 0; i < dev->addr_len; i++)
+ virtio_cwrite8(vdev,
+ offsetof(struct virtio_net_config, mac) +
+ i, addr->sa_data[i]);
+ }
+
+ eth_commit_mac_addr_change(dev, p);
+
+ return 0;
+}
+
+static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *tot)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int cpu;
+ unsigned int start;
+
+ for_each_possible_cpu(cpu) {
+ struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
+ u64 tpackets, tbytes, rpackets, rbytes;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&stats->tx_syncp);
+ tpackets = stats->tx_packets;
+ tbytes = stats->tx_bytes;
+ } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start));
+
+ do {
+ start = u64_stats_fetch_begin_irq(&stats->rx_syncp);
+ rpackets = stats->rx_packets;
+ rbytes = stats->rx_bytes;
+ } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start));
+
+ tot->rx_packets += rpackets;
+ tot->tx_packets += tpackets;
+ tot->rx_bytes += rbytes;
+ tot->tx_bytes += tbytes;
+ }
+
+ tot->tx_dropped = dev->stats.tx_dropped;
+ tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+ tot->rx_dropped = dev->stats.rx_dropped;
+ tot->rx_length_errors = dev->stats.rx_length_errors;
+ tot->rx_frame_errors = dev->stats.rx_frame_errors;
+
+ return tot;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void virtnet_netpoll(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ for (i = 0; i < vi->curr_queue_pairs; i++)
+ napi_schedule(&vi->rq[i].napi);
+}
+#endif
+
+static void virtnet_ack_link_announce(struct virtnet_info *vi)
+{
+ rtnl_lock();
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE,
+ VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL))
+ dev_warn(&vi->dev->dev, "Failed to ack link announce.\n");
+ rtnl_unlock();
+}
+
+static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
+{
+ struct scatterlist sg;
+ struct virtio_net_ctrl_mq s;
+ struct net_device *dev = vi->dev;
+
+ if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
+ return 0;
+
+ s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
+ sg_init_one(&sg, &s, sizeof(s));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
+ VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
+ dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n",
+ queue_pairs);
+ return -EINVAL;
+ } else {
+ vi->curr_queue_pairs = queue_pairs;
+ /* virtnet_open() will refill when device is going to up. */
+ if (dev->flags & IFF_UP)
+ schedule_delayed_work(&vi->refill, 0);
+ }
+
+ return 0;
+}
+
+static int virtnet_close(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ /* Make sure refill_work doesn't re-enable napi! */
+ cancel_delayed_work_sync(&vi->refill);
+
+ for (i = 0; i < vi->max_queue_pairs; i++)
+ napi_disable(&vi->rq[i].napi);
+
+ return 0;
+}
+
+static void virtnet_set_rx_mode(struct net_device *dev)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg[2];
+ u8 promisc, allmulti;
+ struct virtio_net_ctrl_mac *mac_data;
+ struct netdev_hw_addr *ha;
+ int uc_count;
+ int mc_count;
+ void *buf;
+ int i;
+
+ /* We can't dynamically set ndo_set_rx_mode, so return gracefully */
+ if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
+ return;
+
+ promisc = ((dev->flags & IFF_PROMISC) != 0);
+ allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
+
+ sg_init_one(sg, &promisc, sizeof(promisc));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
+ VIRTIO_NET_CTRL_RX_PROMISC, sg))
+ dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
+ promisc ? "en" : "dis");
+
+ sg_init_one(sg, &allmulti, sizeof(allmulti));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
+ VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
+ dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
+ allmulti ? "en" : "dis");
+
+ uc_count = netdev_uc_count(dev);
+ mc_count = netdev_mc_count(dev);
+ /* MAC filter - use one buffer for both lists */
+ buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
+ (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
+ mac_data = buf;
+ if (!buf)
+ return;
+
+ sg_init_table(sg, 2);
+
+ /* Store the unicast list and count in the front of the buffer */
+ mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
+ i = 0;
+ netdev_for_each_uc_addr(ha, dev)
+ memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
+
+ sg_set_buf(&sg[0], mac_data,
+ sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
+
+ /* multicast list and count fill the end */
+ mac_data = (void *)&mac_data->macs[uc_count][0];
+
+ mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
+ i = 0;
+ netdev_for_each_mc_addr(ha, dev)
+ memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
+
+ sg_set_buf(&sg[1], mac_data,
+ sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
+ VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
+ dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
+
+ kfree(buf);
+}
+
+static int virtnet_vlan_rx_add_vid(struct net_device *dev,
+ __be16 proto, u16 vid)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg;
+
+ sg_init_one(&sg, &vid, sizeof(vid));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
+ VIRTIO_NET_CTRL_VLAN_ADD, &sg))
+ dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
+ return 0;
+}
+
+static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
+ __be16 proto, u16 vid)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct scatterlist sg;
+
+ sg_init_one(&sg, &vid, sizeof(vid));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
+ VIRTIO_NET_CTRL_VLAN_DEL, &sg))
+ dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
+ return 0;
+}
+
+static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu)
+{
+ int i;
+
+ if (vi->affinity_hint_set) {
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ virtqueue_set_affinity(vi->rq[i].vq, -1);
+ virtqueue_set_affinity(vi->sq[i].vq, -1);
+ }
+
+ vi->affinity_hint_set = false;
+ }
+}
+
+static void virtnet_set_affinity(struct virtnet_info *vi)
+{
+ int i;
+ int cpu;
+
+ /* In multiqueue mode, when the number of cpu is equal to the number of
+ * queue pairs, we let the queue pairs to be private to one cpu by
+ * setting the affinity hint to eliminate the contention.
+ */
+ if (vi->curr_queue_pairs == 1 ||
+ vi->max_queue_pairs != num_online_cpus()) {
+ virtnet_clean_affinity(vi, -1);
+ return;
+ }
+
+ i = 0;
+ for_each_online_cpu(cpu) {
+ virtqueue_set_affinity(vi->rq[i].vq, cpu);
+ virtqueue_set_affinity(vi->sq[i].vq, cpu);
+ netif_set_xps_queue(vi->dev, cpumask_of(cpu), i);
+ i++;
+ }
+
+ vi->affinity_hint_set = true;
+}
+
+static int virtnet_cpu_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb);
+
+ switch(action & ~CPU_TASKS_FROZEN) {
+ case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
+ case CPU_DEAD:
+ virtnet_set_affinity(vi);
+ break;
+ case CPU_DOWN_PREPARE:
+ virtnet_clean_affinity(vi, (long)hcpu);
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static void virtnet_get_ringparam(struct net_device *dev,
+ struct ethtool_ringparam *ring)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq);
+ ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
+ ring->rx_pending = ring->rx_max_pending;
+ ring->tx_pending = ring->tx_max_pending;
+}
+
+
+static void virtnet_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct virtio_device *vdev = vi->vdev;
+
+ strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
+ strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
+ strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
+
+}
+
+/* TODO: Eliminate OOO packets during switching */
+static int virtnet_set_channels(struct net_device *dev,
+ struct ethtool_channels *channels)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ u16 queue_pairs = channels->combined_count;
+ int err;
+
+ /* We don't support separate rx/tx channels.
+ * We don't allow setting 'other' channels.
+ */
+ if (channels->rx_count || channels->tx_count || channels->other_count)
+ return -EINVAL;
+
+ if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
+ return -EINVAL;
+
+ get_online_cpus();
+ err = virtnet_set_queues(vi, queue_pairs);
+ if (!err) {
+ netif_set_real_num_tx_queues(dev, queue_pairs);
+ netif_set_real_num_rx_queues(dev, queue_pairs);
+
+ virtnet_set_affinity(vi);
+ }
+ put_online_cpus();
+
+ return err;
+}
+
+static void virtnet_get_channels(struct net_device *dev,
+ struct ethtool_channels *channels)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ channels->combined_count = vi->curr_queue_pairs;
+ channels->max_combined = vi->max_queue_pairs;
+ channels->max_other = 0;
+ channels->rx_count = 0;
+ channels->tx_count = 0;
+ channels->other_count = 0;
+}
+
+static const struct ethtool_ops virtnet_ethtool_ops = {
+ .get_drvinfo = virtnet_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ringparam = virtnet_get_ringparam,
+ .set_channels = virtnet_set_channels,
+ .get_channels = virtnet_get_channels,
+ .get_ts_info = ethtool_op_get_ts_info,
+};
+
+#define MIN_MTU 68
+#define MAX_MTU 65535
+
+static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+
+static const struct net_device_ops virtnet_netdev = {
+ .ndo_open = virtnet_open,
+ .ndo_stop = virtnet_close,
+ .ndo_start_xmit = start_xmit,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = virtnet_set_mac_address,
+ .ndo_set_rx_mode = virtnet_set_rx_mode,
+ .ndo_change_mtu = virtnet_change_mtu,
+ .ndo_get_stats64 = virtnet_stats,
+ .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = virtnet_netpoll,
+#endif
+#ifdef CONFIG_NET_RX_BUSY_POLL
+ .ndo_busy_poll = virtnet_busy_poll,
+#endif
+};
+
+static void virtnet_config_changed_work(struct work_struct *work)
+{
+ struct virtnet_info *vi =
+ container_of(work, struct virtnet_info, config_work);
+ u16 v;
+
+ if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS,
+ struct virtio_net_config, status, &v) < 0)
+ return;
+
+ if (v & VIRTIO_NET_S_ANNOUNCE) {
+ netdev_notify_peers(vi->dev);
+ virtnet_ack_link_announce(vi);
+ }
+
+ /* Ignore unknown (future) status bits */
+ v &= VIRTIO_NET_S_LINK_UP;
+
+ if (vi->status == v)
+ return;
+
+ vi->status = v;
+
+ if (vi->status & VIRTIO_NET_S_LINK_UP) {
+ netif_carrier_on(vi->dev);
+ netif_tx_wake_all_queues(vi->dev);
+ } else {
+ netif_carrier_off(vi->dev);
+ netif_tx_stop_all_queues(vi->dev);
+ }
+}
+
+static void virtnet_config_changed(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+
+ schedule_work(&vi->config_work);
+}
+
+static void virtnet_free_queues(struct virtnet_info *vi)
+{
+ int i;
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ napi_hash_del(&vi->rq[i].napi);
+ netif_napi_del(&vi->rq[i].napi);
+ }
+
+ kfree(vi->rq);
+ kfree(vi->sq);
+}
+
+static void free_receive_bufs(struct virtnet_info *vi)
+{
+ int i;
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ while (vi->rq[i].pages)
+ __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0);
+ }
+}
+
+static void free_receive_page_frags(struct virtnet_info *vi)
+{
+ int i;
+ for (i = 0; i < vi->max_queue_pairs; i++)
+ if (vi->rq[i].alloc_frag.page)
+ put_page(vi->rq[i].alloc_frag.page);
+}
+
+static void free_unused_bufs(struct virtnet_info *vi)
+{
+ void *buf;
+ int i;
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ struct virtqueue *vq = vi->sq[i].vq;
+ while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
+ dev_kfree_skb(buf);
+ }
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ struct virtqueue *vq = vi->rq[i].vq;
+
+ while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
+ if (vi->mergeable_rx_bufs) {
+ unsigned long ctx = (unsigned long)buf;
+ void *base = mergeable_ctx_to_buf_address(ctx);
+ put_page(virt_to_head_page(base));
+ } else if (vi->big_packets) {
+ give_pages(&vi->rq[i], buf);
+ } else {
+ dev_kfree_skb(buf);
+ }
+ }
+ }
+}
+
+static void virtnet_del_vqs(struct virtnet_info *vi)
+{
+ struct virtio_device *vdev = vi->vdev;
+
+ virtnet_clean_affinity(vi, -1);
+
+ vdev->config->del_vqs(vdev);
+
+ virtnet_free_queues(vi);
+}
+
+static int virtnet_find_vqs(struct virtnet_info *vi)
+{
+ vq_callback_t **callbacks;
+ struct virtqueue **vqs;
+ int ret = -ENOMEM;
+ int i, total_vqs;
+ const char **names;
+
+ /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
+ * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
+ * possible control vq.
+ */
+ total_vqs = vi->max_queue_pairs * 2 +
+ virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
+
+ /* Allocate space for find_vqs parameters */
+ vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL);
+ if (!vqs)
+ goto err_vq;
+ callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL);
+ if (!callbacks)
+ goto err_callback;
+ names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
+ if (!names)
+ goto err_names;
+
+ /* Parameters for control virtqueue, if any */
+ if (vi->has_cvq) {
+ callbacks[total_vqs - 1] = NULL;
+ names[total_vqs - 1] = "control";
+ }
+
+ /* Allocate/initialize parameters for send/receive virtqueues */
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ callbacks[rxq2vq(i)] = skb_recv_done;
+ callbacks[txq2vq(i)] = skb_xmit_done;
+ sprintf(vi->rq[i].name, "input.%d", i);
+ sprintf(vi->sq[i].name, "output.%d", i);
+ names[rxq2vq(i)] = vi->rq[i].name;
+ names[txq2vq(i)] = vi->sq[i].name;
+ }
+
+ ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
+ names);
+ if (ret)
+ goto err_find;
+
+ if (vi->has_cvq) {
+ vi->cvq = vqs[total_vqs - 1];
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
+ vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
+ }
+
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ vi->rq[i].vq = vqs[rxq2vq(i)];
+ vi->sq[i].vq = vqs[txq2vq(i)];
+ }
+
+ kfree(names);
+ kfree(callbacks);
+ kfree(vqs);
+
+ return 0;
+
+err_find:
+ kfree(names);
+err_names:
+ kfree(callbacks);
+err_callback:
+ kfree(vqs);
+err_vq:
+ return ret;
+}
+
+static int virtnet_alloc_queues(struct virtnet_info *vi)
+{
+ int i;
+
+ vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL);
+ if (!vi->sq)
+ goto err_sq;
+ vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL);
+ if (!vi->rq)
+ goto err_rq;
+
+ INIT_DELAYED_WORK(&vi->refill, refill_work);
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ vi->rq[i].pages = NULL;
+ netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll,
+ napi_weight);
+ napi_hash_add(&vi->rq[i].napi);
+
+ sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
+ ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT);
+ sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
+ }
+
+ return 0;
+
+err_rq:
+ kfree(vi->sq);
+err_sq:
+ return -ENOMEM;
+}
+
+static int init_vqs(struct virtnet_info *vi)
+{
+ int ret;
+
+ /* Allocate send & receive queues */
+ ret = virtnet_alloc_queues(vi);
+ if (ret)
+ goto err;
+
+ ret = virtnet_find_vqs(vi);
+ if (ret)
+ goto err_free;
+
+ get_online_cpus();
+ virtnet_set_affinity(vi);
+ put_online_cpus();
+
+ return 0;
+
+err_free:
+ virtnet_free_queues(vi);
+err:
+ return ret;
+}
+
+#ifdef CONFIG_SYSFS
+static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue,
+ struct rx_queue_attribute *attribute, char *buf)
+{
+ struct virtnet_info *vi = netdev_priv(queue->dev);
+ unsigned int queue_index = get_netdev_rx_queue_index(queue);
+ struct ewma *avg;
+
+ BUG_ON(queue_index >= vi->max_queue_pairs);
+ avg = &vi->rq[queue_index].mrg_avg_pkt_len;
+ return sprintf(buf, "%u\n", get_mergeable_buf_len(avg));
+}
+
+static struct rx_queue_attribute mergeable_rx_buffer_size_attribute =
+ __ATTR_RO(mergeable_rx_buffer_size);
+
+static struct attribute *virtio_net_mrg_rx_attrs[] = {
+ &mergeable_rx_buffer_size_attribute.attr,
+ NULL
+};
+
+static const struct attribute_group virtio_net_mrg_rx_group = {
+ .name = "virtio_net",
+ .attrs = virtio_net_mrg_rx_attrs
+};
+#endif
+
+static bool virtnet_fail_on_feature(struct virtio_device *vdev,
+ unsigned int fbit,
+ const char *fname, const char *dname)
+{
+ if (!virtio_has_feature(vdev, fbit))
+ return false;
+
+ dev_err(&vdev->dev, "device advertises feature %s but not %s",
+ fname, dname);
+
+ return true;
+}
+
+#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \
+ virtnet_fail_on_feature(vdev, fbit, #fbit, dbit)
+
+static bool virtnet_validate_features(struct virtio_device *vdev)
+{
+ if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) &&
+ (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX,
+ "VIRTIO_NET_F_CTRL_VQ") ||
+ VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN,
+ "VIRTIO_NET_F_CTRL_VQ") ||
+ VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE,
+ "VIRTIO_NET_F_CTRL_VQ") ||
+ VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") ||
+ VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR,
+ "VIRTIO_NET_F_CTRL_VQ"))) {
+ return false;
+ }
+
+ return true;
+}
+
+static int virtnet_probe(struct virtio_device *vdev)
+{
+ int i, err;
+ struct net_device *dev;
+ struct virtnet_info *vi;
+ u16 max_queue_pairs;
+
+ if (!vdev->config->get) {
+ dev_err(&vdev->dev, "%s failure: config access disabled\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ if (!virtnet_validate_features(vdev))
+ return -EINVAL;
+
+ /* Find if host supports multiqueue virtio_net device */
+ err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
+ struct virtio_net_config,
+ max_virtqueue_pairs, &max_queue_pairs);
+
+ /* We need at least 2 queue's */
+ if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
+ max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
+ !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
+ max_queue_pairs = 1;
+
+ /* Allocate ourselves a network device with room for our info */
+ dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
+ if (!dev)
+ return -ENOMEM;
+
+ /* Set up network device as normal. */
+ dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
+ dev->netdev_ops = &virtnet_netdev;
+ dev->features = NETIF_F_HIGHDMA;
+
+ dev->ethtool_ops = &virtnet_ethtool_ops;
+ SET_NETDEV_DEV(dev, &vdev->dev);
+
+ /* Do we support "hardware" checksums? */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
+ /* This opens up the world of extra features. */
+ dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+ if (csum)
+ dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
+ dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
+ | NETIF_F_TSO_ECN | NETIF_F_TSO6;
+ }
+ /* Individual feature bits: what can host handle? */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
+ dev->hw_features |= NETIF_F_TSO;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
+ dev->hw_features |= NETIF_F_TSO6;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
+ dev->hw_features |= NETIF_F_TSO_ECN;
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
+ dev->hw_features |= NETIF_F_UFO;
+
+ dev->features |= NETIF_F_GSO_ROBUST;
+
+ if (gso)
+ dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
+ /* (!csum && gso) case will be fixed by register_netdev() */
+ }
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
+ dev->features |= NETIF_F_RXCSUM;
+
+ dev->vlan_features = dev->features;
+
+ /* Configuration may specify what MAC to use. Otherwise random. */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
+ virtio_cread_bytes(vdev,
+ offsetof(struct virtio_net_config, mac),
+ dev->dev_addr, dev->addr_len);
+ else
+ eth_hw_addr_random(dev);
+
+ /* Set up our device-specific information */
+ vi = netdev_priv(dev);
+ vi->dev = dev;
+ vi->vdev = vdev;
+ vdev->priv = vi;
+ vi->stats = alloc_percpu(struct virtnet_stats);
+ err = -ENOMEM;
+ if (vi->stats == NULL)
+ goto free;
+
+ for_each_possible_cpu(i) {
+ struct virtnet_stats *virtnet_stats;
+ virtnet_stats = per_cpu_ptr(vi->stats, i);
+ u64_stats_init(&virtnet_stats->tx_syncp);
+ u64_stats_init(&virtnet_stats->rx_syncp);
+ }
+
+ INIT_WORK(&vi->config_work, virtnet_config_changed_work);
+
+ /* If we can receive ANY GSO packets, we must allocate large ones. */
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
+ virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
+ virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
+ virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
+ vi->big_packets = true;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
+ vi->mergeable_rx_bufs = true;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
+ virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
+ vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+ else
+ vi->hdr_len = sizeof(struct virtio_net_hdr);
+
+ if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT))
+ vi->any_header_sg = true;
+
+ if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
+ vi->has_cvq = true;
+
+ if (vi->any_header_sg)
+ dev->needed_headroom = vi->hdr_len;
+
+ /* Use single tx/rx queue pair as default */
+ vi->curr_queue_pairs = 1;
+ vi->max_queue_pairs = max_queue_pairs;
+
+ /* Allocate/initialize the rx/tx queues, and invoke find_vqs */
+ err = init_vqs(vi);
+ if (err)
+ goto free_stats;
+
+#ifdef CONFIG_SYSFS
+ if (vi->mergeable_rx_bufs)
+ dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group;
+#endif
+ netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs);
+ netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs);
+
+ err = register_netdev(dev);
+ if (err) {
+ pr_debug("virtio_net: registering device failed\n");
+ goto free_vqs;
+ }
+
+ virtio_device_ready(vdev);
+
+ /* Last of all, set up some receive buffers. */
+ for (i = 0; i < vi->curr_queue_pairs; i++) {
+ try_fill_recv(vi, &vi->rq[i], GFP_KERNEL);
+
+ /* If we didn't even get one input buffer, we're useless. */
+ if (vi->rq[i].vq->num_free ==
+ virtqueue_get_vring_size(vi->rq[i].vq)) {
+ free_unused_bufs(vi);
+ err = -ENOMEM;
+ goto free_recv_bufs;
+ }
+ }
+
+ vi->nb.notifier_call = &virtnet_cpu_callback;
+ err = register_hotcpu_notifier(&vi->nb);
+ if (err) {
+ pr_debug("virtio_net: registering cpu notifier failed\n");
+ goto free_recv_bufs;
+ }
+
+ /* Assume link up if device can't report link status,
+ otherwise get link status from config. */
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
+ netif_carrier_off(dev);
+ schedule_work(&vi->config_work);
+ } else {
+ vi->status = VIRTIO_NET_S_LINK_UP;
+ netif_carrier_on(dev);
+ }
+
+ pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
+ dev->name, max_queue_pairs);
+
+ return 0;
+
+free_recv_bufs:
+ vi->vdev->config->reset(vdev);
+
+ free_receive_bufs(vi);
+ unregister_netdev(dev);
+free_vqs:
+ cancel_delayed_work_sync(&vi->refill);
+ free_receive_page_frags(vi);
+ virtnet_del_vqs(vi);
+free_stats:
+ free_percpu(vi->stats);
+free:
+ free_netdev(dev);
+ return err;
+}
+
+static void remove_vq_common(struct virtnet_info *vi)
+{
+ vi->vdev->config->reset(vi->vdev);
+
+ /* Free unused buffers in both send and recv, if any. */
+ free_unused_bufs(vi);
+
+ free_receive_bufs(vi);
+
+ free_receive_page_frags(vi);
+
+ virtnet_del_vqs(vi);
+}
+
+static void virtnet_remove(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+
+ unregister_hotcpu_notifier(&vi->nb);
+
+ /* Make sure no work handler is accessing the device. */
+ flush_work(&vi->config_work);
+
+ unregister_netdev(vi->dev);
+
+ remove_vq_common(vi);
+
+ free_percpu(vi->stats);
+ free_netdev(vi->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int virtnet_freeze(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+ int i;
+
+ unregister_hotcpu_notifier(&vi->nb);
+
+ /* Make sure no work handler is accessing the device */
+ flush_work(&vi->config_work);
+
+ netif_device_detach(vi->dev);
+ cancel_delayed_work_sync(&vi->refill);
+
+ if (netif_running(vi->dev)) {
+ for (i = 0; i < vi->max_queue_pairs; i++)
+ napi_disable(&vi->rq[i].napi);
+ }
+
+ remove_vq_common(vi);
+
+ return 0;
+}
+
+static int virtnet_restore(struct virtio_device *vdev)
+{
+ struct virtnet_info *vi = vdev->priv;
+ int err, i;
+
+ err = init_vqs(vi);
+ if (err)
+ return err;
+
+ virtio_device_ready(vdev);
+
+ if (netif_running(vi->dev)) {
+ for (i = 0; i < vi->curr_queue_pairs; i++)
+ if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
+ schedule_delayed_work(&vi->refill, 0);
+
+ for (i = 0; i < vi->max_queue_pairs; i++)
+ virtnet_napi_enable(&vi->rq[i]);
+ }
+
+ netif_device_attach(vi->dev);
+
+ rtnl_lock();
+ virtnet_set_queues(vi, vi->curr_queue_pairs);
+ rtnl_unlock();
+
+ err = register_hotcpu_notifier(&vi->nb);
+ if (err)
+ return err;
+
+ return 0;
+}
+#endif
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+ VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
+ VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
+ VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
+ VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
+ VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
+ VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
+ VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
+ VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ,
+ VIRTIO_NET_F_CTRL_MAC_ADDR,
+ VIRTIO_F_ANY_LAYOUT,
+};
+
+static struct virtio_driver virtio_net_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtnet_probe,
+ .remove = virtnet_remove,
+ .config_changed = virtnet_config_changed,
+#ifdef CONFIG_PM_SLEEP
+ .freeze = virtnet_freeze,
+ .restore = virtnet_restore,
+#endif
+};
+
+module_virtio_driver(virtio_net_driver);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio network driver");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff