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- /* 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
- /* 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.
- */
- DECLARE_EWMA(pkt_len, 1, 64)
- /* With mergeable buffers we align buffer address and use the low bits to
- * encode its true size. Buffer size is up to 1 page so we need to align to
- * square root of page size to ensure we reserve enough bits to encode the true
- * size.
- */
- #define MERGEABLE_BUFFER_MIN_ALIGN_SHIFT ((PAGE_SHIFT + 1) / 2)
- /* Minimum alignment for mergeable packet buffers. */
- #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, \
- 1 << MERGEABLE_BUFFER_MIN_ALIGN_SHIFT)
- #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.$index */
- char name[40];
- };
- /* Internal representation of a receive virtqueue */
- struct receive_queue {
- /* Virtqueue associated with this receive_queue */
- struct virtqueue *vq;
- struct napi_struct napi;
- /* Chain pages by the private ptr. */
- struct page *pages;
- /* Average packet length for mergeable receive buffers. */
- struct ewma_pkt_len mrg_avg_pkt_len;
- /* Page frag for packet buffer allocation. */
- struct page_frag alloc_frag;
- /* RX: fragments + linear part + virtio header */
- struct scatterlist sg[MAX_SKB_FRAGS + 2];
- /* Name of this receive queue: input.$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;
- /* Control VQ buffers: protected by the rtnl lock */
- struct virtio_net_ctrl_hdr ctrl_hdr;
- virtio_net_ctrl_ack ctrl_status;
- u8 ctrl_promisc;
- u8 ctrl_allmulti;
- };
- 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_pkt_len_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);
- napi_gro_receive(&rq->napi, 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, 2);
- sg_set_buf(rq->sg, hdr, vi->hdr_len);
- err = skb_to_sgvec(skb, rq->sg + 1, 0, skb->len);
- if (unlikely(err < 0)) {
- dev_kfree_skb(skb);
- return err;
- }
- 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_pkt_len *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_pkt_len_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_done(napi, received);
- 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;
- int 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, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2));
- if (can_push) {
- __skb_push(skb, hdr_len);
- num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
- if (unlikely(num_sg < 0))
- return num_sg;
- /* 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);
- if (unlikely(num_sg < 0))
- return num_sg;
- num_sg++;
- }
- 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;
- unsigned out_num = 0, tmp;
- /* Caller should know better */
- BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ));
- vi->ctrl_status = ~0;
- vi->ctrl_hdr.class = class;
- vi->ctrl_hdr.cmd = cmd;
- /* Add header */
- sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr));
- sgs[out_num++] = &hdr;
- if (out)
- sgs[out_num++] = out;
- /* Add return status. */
- sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_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 vi->ctrl_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 vi->ctrl_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];
- 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;
- vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0);
- vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
- sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_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",
- vi->ctrl_promisc ? "en" : "dis");
- sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_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",
- vi->ctrl_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
- .ndo_features_check = passthru_features_check,
- };
- 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);
- }
- /* We called napi_hash_del() before netif_napi_del(),
- * we need to respect an RCU grace period before freeing vi->rq
- */
- synchronize_net();
- 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_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
- 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_pkt_len *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;
- if (csum)
- dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
- 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) ||
- virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
- 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. */
- netif_carrier_off(dev);
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
- 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");
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