| /* 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/bpf.h> |
| #include <linux/bpf_trace.h> |
| #include <linux/scatterlist.h> |
| #include <linux/if_vlan.h> |
| #include <linux/slab.h> |
| #include <linux/cpu.h> |
| #include <linux/average.h> |
| #include <net/route.h> |
| |
| static int napi_weight = NAPI_POLL_WEIGHT; |
| module_param(napi_weight, int, 0444); |
| |
| static bool csum = true, gso = true, napi_tx; |
| module_param(csum, bool, 0444); |
| module_param(gso, bool, 0444); |
| module_param(napi_tx, bool, 0644); |
| |
| /* FIXME: MTU in config. */ |
| #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
| #define GOOD_COPY_LEN 128 |
| |
| #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
| |
| /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ |
| #define VIRTIO_XDP_HEADROOM 256 |
| |
| /* 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, 0, 64) |
| |
| #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.$index */ |
| char name[40]; |
| |
| struct napi_struct napi; |
| }; |
| |
| /* Internal representation of a receive virtqueue */ |
| struct receive_queue { |
| /* Virtqueue associated with this receive_queue */ |
| struct virtqueue *vq; |
| |
| struct napi_struct napi; |
| |
| struct bpf_prog __rcu *xdp_prog; |
| |
| /* Chain pages by the private ptr. */ |
| struct page *pages; |
| |
| /* Average packet length for mergeable receive buffers. */ |
| struct ewma_pkt_len mrg_avg_pkt_len; |
| |
| /* Page frag for packet buffer allocation. */ |
| struct page_frag alloc_frag; |
| |
| /* RX: fragments + linear part + virtio header */ |
| struct scatterlist sg[MAX_SKB_FRAGS + 2]; |
| |
| /* Min single buffer size for mergeable buffers case. */ |
| unsigned int min_buf_len; |
| |
| /* Name of this receive queue: input.$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; |
| |
| /* # of XDP queue pairs currently used by the driver */ |
| u16 xdp_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 hotplug instances for online & dead */ |
| struct hlist_node node; |
| struct hlist_node node_dead; |
| |
| /* Control VQ buffers: protected by the rtnl lock */ |
| struct virtio_net_ctrl_hdr ctrl_hdr; |
| virtio_net_ctrl_ack ctrl_status; |
| struct virtio_net_ctrl_mq ctrl_mq; |
| u8 ctrl_promisc; |
| u8 ctrl_allmulti; |
| u16 ctrl_vid; |
| |
| /* Ethtool settings */ |
| u8 duplex; |
| u32 speed; |
| }; |
| |
| 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 virtqueue_napi_schedule(struct napi_struct *napi, |
| struct virtqueue *vq) |
| { |
| if (napi_schedule_prep(napi)) { |
| virtqueue_disable_cb(vq); |
| __napi_schedule(napi); |
| } |
| } |
| |
| static void virtqueue_napi_complete(struct napi_struct *napi, |
| struct virtqueue *vq, int processed) |
| { |
| int opaque; |
| |
| opaque = virtqueue_enable_cb_prepare(vq); |
| if (napi_complete_done(napi, processed) && |
| unlikely(virtqueue_poll(vq, opaque))) |
| virtqueue_napi_schedule(napi, vq); |
| } |
| |
| static void skb_xmit_done(struct virtqueue *vq) |
| { |
| struct virtnet_info *vi = vq->vdev->priv; |
| struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
| |
| /* Suppress further interrupts. */ |
| virtqueue_disable_cb(vq); |
| |
| if (napi->weight) |
| virtqueue_napi_schedule(napi, vq); |
| else |
| /* We were probably waiting for more output buffers. */ |
| netif_wake_subqueue(vi->dev, vq2txq(vq)); |
| } |
| |
| /* 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 = napi_alloc_skb(&rq->napi, 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); |
| skb_put_data(skb, 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 bool virtnet_xdp_xmit(struct virtnet_info *vi, |
| struct receive_queue *rq, |
| struct xdp_buff *xdp) |
| { |
| struct virtio_net_hdr_mrg_rxbuf *hdr; |
| unsigned int len; |
| struct send_queue *sq; |
| unsigned int qp; |
| void *xdp_sent; |
| int err; |
| |
| qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); |
| sq = &vi->sq[qp]; |
| |
| /* Free up any pending old buffers before queueing new ones. */ |
| while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
| struct page *sent_page = virt_to_head_page(xdp_sent); |
| |
| put_page(sent_page); |
| } |
| |
| xdp->data -= vi->hdr_len; |
| /* Zero header and leave csum up to XDP layers */ |
| hdr = xdp->data; |
| memset(hdr, 0, vi->hdr_len); |
| |
| sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data); |
| |
| err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp->data, GFP_ATOMIC); |
| if (unlikely(err)) { |
| struct page *page = virt_to_head_page(xdp->data); |
| |
| put_page(page); |
| return false; |
| } |
| |
| virtqueue_kick(sq->vq); |
| return true; |
| } |
| |
| static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
| { |
| return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; |
| } |
| |
| static struct sk_buff *receive_small(struct net_device *dev, |
| struct virtnet_info *vi, |
| struct receive_queue *rq, |
| void *buf, unsigned int len) |
| { |
| struct sk_buff *skb; |
| struct bpf_prog *xdp_prog; |
| unsigned int xdp_headroom = virtnet_get_headroom(vi); |
| unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; |
| unsigned int headroom = vi->hdr_len + header_offset; |
| unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + |
| SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
| unsigned int delta = 0; |
| len -= vi->hdr_len; |
| |
| rcu_read_lock(); |
| xdp_prog = rcu_dereference(rq->xdp_prog); |
| if (xdp_prog) { |
| struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
| struct xdp_buff xdp; |
| void *orig_data; |
| u32 act; |
| |
| if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags)) |
| goto err_xdp; |
| |
| xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
| xdp.data = xdp.data_hard_start + xdp_headroom; |
| xdp.data_end = xdp.data + len; |
| orig_data = xdp.data; |
| act = bpf_prog_run_xdp(xdp_prog, &xdp); |
| |
| switch (act) { |
| case XDP_PASS: |
| /* Recalculate length in case bpf program changed it */ |
| delta = orig_data - xdp.data; |
| break; |
| case XDP_TX: |
| if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
| trace_xdp_exception(vi->dev, xdp_prog, act); |
| rcu_read_unlock(); |
| goto xdp_xmit; |
| default: |
| bpf_warn_invalid_xdp_action(act); |
| case XDP_ABORTED: |
| trace_xdp_exception(vi->dev, xdp_prog, act); |
| case XDP_DROP: |
| goto err_xdp; |
| } |
| } |
| rcu_read_unlock(); |
| |
| skb = build_skb(buf, buflen); |
| if (!skb) { |
| put_page(virt_to_head_page(buf)); |
| goto err; |
| } |
| skb_reserve(skb, headroom - delta); |
| skb_put(skb, len + delta); |
| if (!delta) { |
| buf += header_offset; |
| memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); |
| } /* keep zeroed vnet hdr since packet was changed by bpf */ |
| |
| err: |
| return skb; |
| |
| err_xdp: |
| rcu_read_unlock(); |
| dev->stats.rx_dropped++; |
| put_page(virt_to_head_page(buf)); |
| xdp_xmit: |
| return NULL; |
| } |
| |
| 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; |
| } |
| |
| /* The conditions to enable XDP should preclude the underlying device from |
| * sending packets across multiple buffers (num_buf > 1). However per spec |
| * it does not appear to be illegal to do so but rather just against convention. |
| * So in order to avoid making a system unresponsive the packets are pushed |
| * into a page and the XDP program is run. This will be extremely slow and we |
| * push a warning to the user to fix this as soon as possible. Fixing this may |
| * require resolving the underlying hardware to determine why multiple buffers |
| * are being received or simply loading the XDP program in the ingress stack |
| * after the skb is built because there is no advantage to running it here |
| * anymore. |
| */ |
| static struct page *xdp_linearize_page(struct receive_queue *rq, |
| u16 *num_buf, |
| struct page *p, |
| int offset, |
| unsigned int *len) |
| { |
| struct page *page = alloc_page(GFP_ATOMIC); |
| unsigned int page_off = VIRTIO_XDP_HEADROOM; |
| |
| if (!page) |
| return NULL; |
| |
| memcpy(page_address(page) + page_off, page_address(p) + offset, *len); |
| page_off += *len; |
| |
| while (--*num_buf) { |
| unsigned int buflen; |
| void *buf; |
| int off; |
| |
| buf = virtqueue_get_buf(rq->vq, &buflen); |
| if (unlikely(!buf)) |
| goto err_buf; |
| |
| p = virt_to_head_page(buf); |
| off = buf - page_address(p); |
| |
| /* guard against a misconfigured or uncooperative backend that |
| * is sending packet larger than the MTU. |
| */ |
| if ((page_off + buflen) > PAGE_SIZE) { |
| put_page(p); |
| goto err_buf; |
| } |
| |
| memcpy(page_address(page) + page_off, |
| page_address(p) + off, buflen); |
| page_off += buflen; |
| put_page(p); |
| } |
| |
| /* Headroom does not contribute to packet length */ |
| *len = page_off - VIRTIO_XDP_HEADROOM; |
| return page; |
| err_buf: |
| __free_pages(page, 0); |
| return NULL; |
| } |
| |
| static struct sk_buff *receive_mergeable(struct net_device *dev, |
| struct virtnet_info *vi, |
| struct receive_queue *rq, |
| void *buf, |
| void *ctx, |
| unsigned int len) |
| { |
| 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); |
| struct sk_buff *head_skb, *curr_skb; |
| struct bpf_prog *xdp_prog; |
| unsigned int truesize; |
| |
| head_skb = NULL; |
| |
| rcu_read_lock(); |
| xdp_prog = rcu_dereference(rq->xdp_prog); |
| if (xdp_prog) { |
| struct page *xdp_page; |
| struct xdp_buff xdp; |
| void *data; |
| u32 act; |
| |
| /* This happens when rx buffer size is underestimated */ |
| if (unlikely(num_buf > 1)) { |
| /* linearize data for XDP */ |
| xdp_page = xdp_linearize_page(rq, &num_buf, |
| page, offset, &len); |
| if (!xdp_page) |
| goto err_xdp; |
| offset = VIRTIO_XDP_HEADROOM; |
| } else { |
| xdp_page = page; |
| } |
| |
| /* Transient failure which in theory could occur if |
| * in-flight packets from before XDP was enabled reach |
| * the receive path after XDP is loaded. In practice I |
| * was not able to create this condition. |
| */ |
| if (unlikely(hdr->hdr.gso_type)) |
| goto err_xdp; |
| |
| /* Allow consuming headroom but reserve enough space to push |
| * the descriptor on if we get an XDP_TX return code. |
| */ |
| data = page_address(xdp_page) + offset; |
| xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
| xdp.data = data + vi->hdr_len; |
| xdp.data_end = xdp.data + (len - vi->hdr_len); |
| act = bpf_prog_run_xdp(xdp_prog, &xdp); |
| |
| switch (act) { |
| case XDP_PASS: |
| /* recalculate offset to account for any header |
| * adjustments. Note other cases do not build an |
| * skb and avoid using offset |
| */ |
| offset = xdp.data - |
| page_address(xdp_page) - vi->hdr_len; |
| |
| /* We can only create skb based on xdp_page. */ |
| if (unlikely(xdp_page != page)) { |
| rcu_read_unlock(); |
| put_page(page); |
| head_skb = page_to_skb(vi, rq, xdp_page, |
| offset, len, PAGE_SIZE); |
| ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
| return head_skb; |
| } |
| break; |
| case XDP_TX: |
| if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
| trace_xdp_exception(vi->dev, xdp_prog, act); |
| ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
| if (unlikely(xdp_page != page)) |
| goto err_xdp; |
| rcu_read_unlock(); |
| goto xdp_xmit; |
| default: |
| bpf_warn_invalid_xdp_action(act); |
| case XDP_ABORTED: |
| trace_xdp_exception(vi->dev, xdp_prog, act); |
| case XDP_DROP: |
| if (unlikely(xdp_page != page)) |
| __free_pages(xdp_page, 0); |
| ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
| goto err_xdp; |
| } |
| } |
| rcu_read_unlock(); |
| |
| if (unlikely(len > (unsigned long)ctx)) { |
| pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
| dev->name, len, (unsigned long)ctx); |
| dev->stats.rx_length_errors++; |
| goto err_skb; |
| } |
| truesize = (unsigned long)ctx; |
| head_skb = page_to_skb(vi, rq, page, offset, len, truesize); |
| curr_skb = head_skb; |
| |
| if (unlikely(!curr_skb)) |
| goto err_skb; |
| while (--num_buf) { |
| int num_skb_frags; |
| |
| buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); |
| 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; |
| } |
| |
| page = virt_to_head_page(buf); |
| if (unlikely(len > (unsigned long)ctx)) { |
| pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
| dev->name, len, (unsigned long)ctx); |
| dev->stats.rx_length_errors++; |
| goto err_skb; |
| } |
| truesize = (unsigned long)ctx; |
| |
| 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; |
| } |
| 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_xdp: |
| rcu_read_unlock(); |
| err_skb: |
| put_page(page); |
| while (--num_buf) { |
| buf = virtqueue_get_buf(rq->vq, &len); |
| if (unlikely(!buf)) { |
| pr_debug("%s: rx error: %d buffers missing\n", |
| dev->name, num_buf); |
| dev->stats.rx_length_errors++; |
| break; |
| } |
| page = virt_to_head_page(buf); |
| put_page(page); |
| } |
| err_buf: |
| dev->stats.rx_dropped++; |
| dev_kfree_skb(head_skb); |
| xdp_xmit: |
| return NULL; |
| } |
| |
| static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
| void *buf, unsigned int len, void **ctx) |
| { |
| struct net_device *dev = vi->dev; |
| struct sk_buff *skb; |
| struct virtio_net_hdr_mrg_rxbuf *hdr; |
| int ret; |
| |
| 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) { |
| put_page(virt_to_head_page(buf)); |
| } else if (vi->big_packets) { |
| give_pages(rq, buf); |
| } else { |
| put_page(virt_to_head_page(buf)); |
| } |
| return 0; |
| } |
| |
| if (vi->mergeable_rx_bufs) |
| skb = receive_mergeable(dev, vi, rq, buf, ctx, len); |
| else if (vi->big_packets) |
| skb = receive_big(dev, vi, rq, buf, len); |
| else |
| skb = receive_small(dev, vi, rq, buf, len); |
| |
| if (unlikely(!skb)) |
| return 0; |
| |
| hdr = skb_vnet_hdr(skb); |
| |
| ret = skb->len; |
| |
| if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
| virtio_is_little_endian(vi->vdev))) { |
| net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", |
| dev->name, hdr->hdr.gso_type, |
| hdr->hdr.gso_size); |
| goto frame_err; |
| } |
| |
| 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); |
| |
| napi_gro_receive(&rq->napi, skb); |
| return ret; |
| |
| frame_err: |
| dev->stats.rx_frame_errors++; |
| dev_kfree_skb(skb); |
| return 0; |
| } |
| |
| static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
| gfp_t gfp) |
| { |
| struct page_frag *alloc_frag = &rq->alloc_frag; |
| char *buf; |
| unsigned int xdp_headroom = virtnet_get_headroom(vi); |
| int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
| int err; |
| |
| len = SKB_DATA_ALIGN(len) + |
| SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
| if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
| return -ENOMEM; |
| |
| buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
| get_page(alloc_frag->page); |
| alloc_frag->offset += len; |
| sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, |
| vi->hdr_len + GOOD_PACKET_LEN); |
| err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp); |
| if (err < 0) |
| put_page(virt_to_head_page(buf)); |
| |
| 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 receive_queue *rq, |
| 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), |
| rq->min_buf_len, PAGE_SIZE - hdr_len); |
| return ALIGN(len, L1_CACHE_BYTES); |
| } |
| |
| static int add_recvbuf_mergeable(struct virtnet_info *vi, |
| struct receive_queue *rq, gfp_t gfp) |
| { |
| struct page_frag *alloc_frag = &rq->alloc_frag; |
| unsigned int headroom = virtnet_get_headroom(vi); |
| char *buf; |
| void *ctx; |
| int err; |
| unsigned int len, hole; |
| |
| len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len); |
| if (unlikely(!skb_page_frag_refill(len + headroom, alloc_frag, gfp))) |
| return -ENOMEM; |
| |
| buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
| buf += headroom; /* advance address leaving hole at front of pkt */ |
| ctx = (void *)(unsigned long)len; |
| get_page(alloc_frag->page); |
| alloc_frag->offset += len + headroom; |
| hole = alloc_frag->size - alloc_frag->offset; |
| if (hole < len + headroom) { |
| /* 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_ctx(rq->vq, rq->sg, 1, buf, 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(vi, 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)]; |
| |
| virtqueue_napi_schedule(&rq->napi, rvq); |
| } |
| |
| static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
| { |
| napi_enable(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. |
| * Call local_bh_enable after to trigger softIRQ processing. |
| */ |
| local_bh_disable(); |
| virtqueue_napi_schedule(napi, vq); |
| local_bh_enable(); |
| } |
| |
| static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
| struct virtqueue *vq, |
| struct napi_struct *napi) |
| { |
| if (!napi->weight) |
| return; |
| |
| /* Tx napi touches cachelines on the cpu handling tx interrupts. Only |
| * enable the feature if this is likely affine with the transmit path. |
| */ |
| if (!vi->affinity_hint_set) { |
| napi->weight = 0; |
| return; |
| } |
| |
| return virtnet_napi_enable(vq, napi); |
| } |
| |
| static void virtnet_napi_tx_disable(struct napi_struct *napi) |
| { |
| if (napi->weight) |
| napi_disable(napi); |
| } |
| |
| 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->vq, &rq->napi); |
| |
| /* 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, bytes = 0; |
| void *buf; |
| struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
| |
| if (vi->mergeable_rx_bufs) { |
| void *ctx; |
| |
| while (received < budget && |
| (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { |
| bytes += receive_buf(vi, rq, buf, len, ctx); |
| received++; |
| } |
| } else { |
| while (received < budget && |
| (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
| bytes += receive_buf(vi, rq, buf, len, NULL); |
| 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); |
| } |
| |
| u64_stats_update_begin(&stats->rx_syncp); |
| stats->rx_bytes += bytes; |
| stats->rx_packets += received; |
| u64_stats_update_end(&stats->rx_syncp); |
| |
| return received; |
| } |
| |
| 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); |
| unsigned int packets = 0; |
| unsigned int bytes = 0; |
| |
| while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
| pr_debug("Sent skb %p\n", skb); |
| |
| bytes += skb->len; |
| packets++; |
| |
| dev_kfree_skb_any(skb); |
| } |
| |
| /* Avoid overhead when no packets have been processed |
| * happens when called speculatively from start_xmit. |
| */ |
| if (!packets) |
| return; |
| |
| u64_stats_update_begin(&stats->tx_syncp); |
| stats->tx_bytes += bytes; |
| stats->tx_packets += packets; |
| u64_stats_update_end(&stats->tx_syncp); |
| } |
| |
| static void virtnet_poll_cleantx(struct receive_queue *rq) |
| { |
| struct virtnet_info *vi = rq->vq->vdev->priv; |
| unsigned int index = vq2rxq(rq->vq); |
| struct send_queue *sq = &vi->sq[index]; |
| struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); |
| |
| if (!sq->napi.weight) |
| return; |
| |
| if (__netif_tx_trylock(txq)) { |
| free_old_xmit_skbs(sq); |
| __netif_tx_unlock(txq); |
| } |
| |
| if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) |
| netif_tx_wake_queue(txq); |
| } |
| |
| static int virtnet_poll(struct napi_struct *napi, int budget) |
| { |
| struct receive_queue *rq = |
| container_of(napi, struct receive_queue, napi); |
| unsigned int received; |
| |
| virtnet_poll_cleantx(rq); |
| |
| received = virtnet_receive(rq, budget); |
| |
| /* Out of packets? */ |
| if (received < budget) |
| virtqueue_napi_complete(napi, rq->vq, received); |
| |
| return received; |
| } |
| |
| 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].vq, &vi->rq[i].napi); |
| virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
| } |
| |
| return 0; |
| } |
| |
| static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
| { |
| struct send_queue *sq = container_of(napi, struct send_queue, napi); |
| struct virtnet_info *vi = sq->vq->vdev->priv; |
| struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq)); |
| |
| __netif_tx_lock(txq, raw_smp_processor_id()); |
| free_old_xmit_skbs(sq); |
| __netif_tx_unlock(txq); |
| |
| virtqueue_napi_complete(napi, sq->vq, 0); |
| |
| if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) |
| netif_tx_wake_queue(txq); |
| |
| return 0; |
| } |
| |
| 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 (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
| virtio_is_little_endian(vi->vdev), false)) |
| BUG(); |
| |
| 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; |
| bool use_napi = sq->napi.weight; |
| |
| /* Free up any pending old buffers before queueing new ones. */ |
| free_old_xmit_skbs(sq); |
| |
| if (use_napi && kick) |
| virtqueue_enable_cb_delayed(sq->vq); |
| |
| /* 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. */ |
| if (!use_napi) { |
| 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 (!use_napi && |
| 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; |
| struct scatterlist sg; |
| |
| addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
| if (!addr) |
| return -ENOMEM; |
| |
| ret = eth_prepare_mac_addr_change(dev, addr); |
| if (ret) |
| goto out; |
| |
| 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"); |
| ret = -EINVAL; |
| goto out; |
| } |
| } 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); |
| ret = 0; |
| |
| out: |
| kfree(addr); |
| return ret; |
| } |
| |
| static void 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; |
| } |
| |
| #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 net_device *dev = vi->dev; |
| |
| if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) |
| return 0; |
| |
| vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
| sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq)); |
| |
| 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_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
| { |
| int err; |
| |
| rtnl_lock(); |
| err = _virtnet_set_queues(vi, queue_pairs); |
| rtnl_unlock(); |
| return err; |
| } |
| |
| 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); |
| virtnet_napi_tx_disable(&vi->sq[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; |
| |
| vi->ctrl_vid = vid; |
| sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_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; |
| |
| vi->ctrl_vid = vid; |
| sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_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_online(unsigned int cpu, struct hlist_node *node) |
| { |
| struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
| node); |
| virtnet_set_affinity(vi); |
| return 0; |
| } |
| |
| static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
| { |
| struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
| node_dead); |
| virtnet_set_affinity(vi); |
| return 0; |
| } |
| |
| static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
| { |
| struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
| node); |
| |
| virtnet_clean_affinity(vi, cpu); |
| return 0; |
| } |
| |
| static enum cpuhp_state virtionet_online; |
| |
| static int virtnet_cpu_notif_add(struct virtnet_info *vi) |
| { |
| int ret; |
| |
| ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); |
| if (ret) |
| return ret; |
| ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, |
| &vi->node_dead); |
| if (!ret) |
| return ret; |
| cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); |
| return ret; |
| } |
| |
| static void virtnet_cpu_notif_remove(struct virtnet_info *vi) |
| { |
| cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); |
| cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, |
| &vi->node_dead); |
| } |
| |
| 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; |
| |
| /* For now we don't support modifying channels while XDP is loaded |
| * also when XDP is loaded all RX queues have XDP programs so we only |
| * need to check a single RX queue. |
| */ |
| if (vi->rq[0].xdp_prog) |
| 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; |
| } |
| |
| /* Check if the user is trying to change anything besides speed/duplex */ |
| static bool |
| virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd) |
| { |
| struct ethtool_link_ksettings diff1 = *cmd; |
| struct ethtool_link_ksettings diff2 = {}; |
| |
| /* cmd is always set so we need to clear it, validate the port type |
| * and also without autonegotiation we can ignore advertising |
| */ |
| diff1.base.speed = 0; |
| diff2.base.port = PORT_OTHER; |
| ethtool_link_ksettings_zero_link_mode(&diff1, advertising); |
| diff1.base.duplex = 0; |
| diff1.base.cmd = 0; |
| diff1.base.link_mode_masks_nwords = 0; |
| |
| return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) && |
| bitmap_empty(diff1.link_modes.supported, |
| __ETHTOOL_LINK_MODE_MASK_NBITS) && |
| bitmap_empty(diff1.link_modes.advertising, |
| __ETHTOOL_LINK_MODE_MASK_NBITS) && |
| bitmap_empty(diff1.link_modes.lp_advertising, |
| __ETHTOOL_LINK_MODE_MASK_NBITS); |
| } |
| |
| static int virtnet_set_link_ksettings(struct net_device *dev, |
| const struct ethtool_link_ksettings *cmd) |
| { |
| struct virtnet_info *vi = netdev_priv(dev); |
| u32 speed; |
| |
| speed = cmd->base.speed; |
| /* don't allow custom speed and duplex */ |
| if (!ethtool_validate_speed(speed) || |
| !ethtool_validate_duplex(cmd->base.duplex) || |
| !virtnet_validate_ethtool_cmd(cmd)) |
| return -EINVAL; |
| vi->speed = speed; |
| vi->duplex = cmd->base.duplex; |
| |
| return 0; |
| } |
| |
| static int virtnet_get_link_ksettings(struct net_device *dev, |
| struct ethtool_link_ksettings *cmd) |
| { |
| struct virtnet_info *vi = netdev_priv(dev); |
| |
| cmd->base.speed = vi->speed; |
| cmd->base.duplex = vi->duplex; |
| cmd->base.port = PORT_OTHER; |
| |
| return 0; |
| } |
| |
| static void virtnet_init_settings(struct net_device *dev) |
| { |
| struct virtnet_info *vi = netdev_priv(dev); |
| |
| vi->speed = SPEED_UNKNOWN; |
| vi->duplex = DUPLEX_UNKNOWN; |
| } |
| |
| 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, |
| .get_link_ksettings = virtnet_get_link_ksettings, |
| .set_link_ksettings = virtnet_set_link_ksettings, |
| }; |
| |
| static void virtnet_freeze_down(struct virtio_device *vdev) |
| { |
| struct virtnet_info *vi = vdev->priv; |
| int i; |
| |
| /* Make sure no work handler is accessing the device */ |
| flush_work(&vi->config_work); |
| |
| netif_device_detach(vi->dev); |
| netif_tx_disable(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); |
| virtnet_napi_tx_disable(&vi->sq[i].napi); |
| } |
| } |
| } |
| |
| static int init_vqs(struct virtnet_info *vi); |
| static void _remove_vq_common(struct virtnet_info *vi); |
| |
| static int virtnet_restore_up(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].vq, &vi->rq[i].napi); |
| virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
| &vi->sq[i].napi); |
| } |
| } |
| |
| netif_device_attach(vi->dev); |
| return err; |
| } |
| |
| static int virtnet_reset(struct virtnet_info *vi, int curr_qp, int xdp_qp) |
| { |
| struct virtio_device *dev = vi->vdev; |
| int ret; |
| |
| virtio_config_disable(dev); |
| dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED; |
| virtnet_freeze_down(dev); |
| _remove_vq_common(vi); |
| |
| virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); |
| virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER); |
| |
| ret = virtio_finalize_features(dev); |
| if (ret) |
| goto err; |
| |
| vi->xdp_queue_pairs = xdp_qp; |
| ret = virtnet_restore_up(dev); |
| if (ret) |
| goto err; |
| ret = _virtnet_set_queues(vi, curr_qp); |
| if (ret) |
| goto err; |
| |
| virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); |
| virtio_config_enable(dev); |
| return 0; |
| err: |
| virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED); |
| return ret; |
| } |
| |
| static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
| struct netlink_ext_ack *extack) |
| { |
| unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); |
| struct virtnet_info *vi = netdev_priv(dev); |
| struct bpf_prog *old_prog; |
| u16 xdp_qp = 0, curr_qp; |
| int i, err; |
| |
| if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || |
| virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || |
| virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || |
| virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) { |
| NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first"); |
| return -EOPNOTSUPP; |
| } |
| |
| if (vi->mergeable_rx_bufs && !vi->any_header_sg) { |
| NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); |
| return -EINVAL; |
| } |
| |
| if (dev->mtu > max_sz) { |
| NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); |
| netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); |
| return -EINVAL; |
| } |
| |
| curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
| if (prog) |
| xdp_qp = nr_cpu_ids; |
| |
| /* XDP requires extra queues for XDP_TX */ |
| if (curr_qp + xdp_qp > vi->max_queue_pairs) { |
| NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); |
| netdev_warn(dev, "request %i queues but max is %i\n", |
| curr_qp + xdp_qp, vi->max_queue_pairs); |
| return -ENOMEM; |
| } |
| |
| if (prog) { |
| prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); |
| if (IS_ERR(prog)) |
| return PTR_ERR(prog); |
| } |
| |
| /* Changing the headroom in buffers is a disruptive operation because |
| * existing buffers must be flushed and reallocated. This will happen |
| * when a xdp program is initially added or xdp is disabled by removing |
| * the xdp program resulting in number of XDP queues changing. |
| */ |
| if (vi->xdp_queue_pairs != xdp_qp) { |
| err = virtnet_reset(vi, curr_qp + xdp_qp, xdp_qp); |
| if (err) { |
| dev_warn(&dev->dev, "XDP reset failure.\n"); |
| goto virtio_reset_err; |
| } |
| } |
| |
| netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
| |
| for (i = 0; i < vi->max_queue_pairs; i++) { |
| old_prog = rtnl_dereference(vi->rq[i].xdp_prog); |
| rcu_assign_pointer(vi->rq[i].xdp_prog, prog); |
| if (old_prog) |
| bpf_prog_put(old_prog); |
| } |
| |
| return 0; |
| |
| virtio_reset_err: |
| /* On reset error do our best to unwind XDP changes inflight and return |
| * error up to user space for resolution. The underlying reset hung on |
| * us so not much we can do here. |
| */ |
| if (prog) |
| bpf_prog_sub(prog, vi->max_queue_pairs - 1); |
| return err; |
| } |
| |
| static u32 virtnet_xdp_query(struct net_device *dev) |
| { |
| struct virtnet_info *vi = netdev_priv(dev); |
| const struct bpf_prog *xdp_prog; |
| int i; |
| |
| for (i = 0; i < vi->max_queue_pairs; i++) { |
| xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog); |
| if (xdp_prog) |
| return xdp_prog->aux->id; |
| } |
| return 0; |
| } |
| |
| static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp) |
| { |
| switch (xdp->command) { |
| case XDP_SETUP_PROG: |
| return virtnet_xdp_set(dev, xdp->prog, xdp->extack); |
| case XDP_QUERY_PROG: |
| xdp->prog_id = virtnet_xdp_query(dev); |
| xdp->prog_attached = !!xdp->prog_id; |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| 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_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 |
| .ndo_xdp = virtnet_xdp, |
| .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); |
| netif_napi_del(&vi->sq[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) |
| { |
| struct bpf_prog *old_prog; |
| 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); |
| |
| old_prog = rtnl_dereference(vi->rq[i].xdp_prog); |
| RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); |
| if (old_prog) |
| bpf_prog_put(old_prog); |
| } |
| } |
| |
| static void free_receive_bufs(struct virtnet_info *vi) |
| { |
| rtnl_lock(); |
| _free_receive_bufs(vi); |
| rtnl_unlock(); |
| } |
| |
| 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 bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
| { |
| if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) |
| return false; |
| else if (q < vi->curr_queue_pairs) |
| return true; |
| else |
| return false; |
| } |
| |
| 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) { |
| if (!is_xdp_raw_buffer_queue(vi, i)) |
| dev_kfree_skb(buf); |
| else |
| put_page(virt_to_head_page(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) { |
| put_page(virt_to_head_page(buf)); |
| } else if (vi->big_packets) { |
| give_pages(&vi->rq[i], buf); |
| } else { |
| put_page(virt_to_head_page(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); |
| } |
| |
| /* How large should a single buffer be so a queue full of these can fit at |
| * least one full packet? |
| * Logic below assumes the mergeable buffer header is used. |
| */ |
| static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) |
| { |
| const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
| unsigned int rq_size = virtqueue_get_vring_size(vq); |
| unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; |
| unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; |
| unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); |
| |
| return max(max(min_buf_len, hdr_len) - hdr_len, |
| (unsigned int)GOOD_PACKET_LEN); |
| } |
| |
| 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; |
| bool *ctx; |
| |
| /* 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; |
| if (vi->mergeable_rx_bufs) { |
| ctx = kzalloc(total_vqs * sizeof(*ctx), GFP_KERNEL); |
| if (!ctx) |
| goto err_ctx; |
| } else { |
| ctx = NULL; |
| } |
| |
| /* 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; |
| if (ctx) |
| ctx[rxq2vq(i)] = true; |
| } |
| |
| ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
| names, ctx, NULL); |
| 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->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); |
| vi->sq[i].vq = vqs[txq2vq(i)]; |
| } |
| |
| kfree(names); |
| kfree(callbacks); |
| kfree(vqs); |
| |
| return 0; |
| |
| err_find: |
| kfree(ctx); |
| err_ctx: |
| 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); |
| netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, |
| napi_tx ? napi_weight : 0); |
| |
| 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(&vi->rq[queue_index], 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; |
| } |
| |
| #define MIN_MTU ETH_MIN_MTU |
| #define MAX_MTU ETH_MAX_MTU |
| |
| static int virtnet_validate(struct virtio_device *vdev) |
| { |
| if (!vdev->config->get) { |
| dev_err(&vdev->dev, "%s failure: config access disabled\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| if (!virtnet_validate_features(vdev)) |
| return -EINVAL; |
| |
| if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
| int mtu = virtio_cread16(vdev, |
| offsetof(struct virtio_net_config, |
| mtu)); |
| if (mtu < MIN_MTU) |
| __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); |
| } |
| |
| return 0; |
| } |
| |
| static int virtnet_probe(struct virtio_device *vdev) |
| { |
| int i, err; |
| struct net_device *dev; |
| struct virtnet_info *vi; |
| u16 max_queue_pairs; |
| int mtu; |
| |
| /* 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; |
| |
| /* MTU range: 68 - 65535 */ |
| dev->min_mtu = MIN_MTU; |
| dev->max_mtu = MAX_MTU; |
| |
| /* 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 (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
| mtu = virtio_cread16(vdev, |
| offsetof(struct virtio_net_config, |
| mtu)); |
| if (mtu < dev->min_mtu) { |
| /* Should never trigger: MTU was previously validated |
| * in virtnet_validate. |
| */ |
| dev_err(&vdev->dev, "device MTU appears to have changed " |
| "it is now %d < %d", mtu, dev->min_mtu); |
| goto free_stats; |
| } |
| |
| dev->mtu = mtu; |
| dev->max_mtu = mtu; |
| |
| /* TODO: size buffers correctly in this case. */ |
| if (dev->mtu > ETH_DATA_LEN) |
| vi->big_packets = true; |
| } |
| |
| if (vi->any_header_sg) |
| dev->needed_headroom = vi->hdr_len; |
| |
| /* Enable multiqueue by default */ |
| if (num_online_cpus() >= max_queue_pairs) |
| vi->curr_queue_pairs = max_queue_pairs; |
| else |
| vi->curr_queue_pairs = num_online_cpus(); |
| 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); |
| |
| virtnet_init_settings(dev); |
| |
| err = register_netdev(dev); |
| if (err) { |
| pr_debug("virtio_net: registering device failed\n"); |
| goto free_vqs; |
| } |
| |
| virtio_device_ready(vdev); |
| |
| err = virtnet_cpu_notif_add(vi); |
| if (err) { |
| pr_debug("virtio_net: registering cpu notifier failed\n"); |
| goto free_unregister_netdev; |
| } |
| |
| virtnet_set_queues(vi, vi->curr_queue_pairs); |
| |
| /* 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_unregister_netdev: |
| vi->vdev->config->reset(vdev); |
| |
| 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_bufs(vi); |
| _free_receive_bufs(vi); |
| free_receive_page_frags(vi); |
| virtnet_del_vqs(vi); |
| } |
| |
| 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; |
| |
| virtnet_cpu_notif_remove(vi); |
| |
| /* 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; |
| |
| virtnet_cpu_notif_remove(vi); |
| virtnet_freeze_down(vdev); |
| remove_vq_common(vi); |
| |
| return 0; |
| } |
| |
| static int virtnet_restore(struct virtio_device *vdev) |
| { |
| struct virtnet_info *vi = vdev->priv; |
| int err; |
| |
| err = virtnet_restore_up(vdev); |
| if (err) |
| return err; |
| virtnet_set_queues(vi, vi->curr_queue_pairs); |
| |
| err = virtnet_cpu_notif_add(vi); |
| if (err) |
| return err; |
| |
| return 0; |
| } |
| #endif |
| |
| static struct virtio_device_id id_table[] = { |
| { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, |
| { 0 }, |
| }; |
| |
| #define VIRTNET_FEATURES \ |
| VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ |
| 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_NET_F_MTU |
| |
| static unsigned int features[] = { |
| VIRTNET_FEATURES, |
| }; |
| |
| static unsigned int features_legacy[] = { |
| VIRTNET_FEATURES, |
| VIRTIO_NET_F_GSO, |
| VIRTIO_F_ANY_LAYOUT, |
| }; |
| |
| static struct virtio_driver virtio_net_driver = { |
| .feature_table = features, |
| .feature_table_size = ARRAY_SIZE(features), |
| .feature_table_legacy = features_legacy, |
| .feature_table_size_legacy = ARRAY_SIZE(features_legacy), |
| .driver.name = KBUILD_MODNAME, |
| .driver.owner = THIS_MODULE, |
| .id_table = id_table, |
| .validate = virtnet_validate, |
| .probe = virtnet_probe, |
| .remove = virtnet_remove, |
| .config_changed = virtnet_config_changed, |
| #ifdef CONFIG_PM_SLEEP |
| .freeze = virtnet_freeze, |
| .restore = virtnet_restore, |
| #endif |
| }; |
| |
| static __init int virtio_net_driver_init(void) |
| { |
| int ret; |
| |
| ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
| virtnet_cpu_online, |
| virtnet_cpu_down_prep); |
| if (ret < 0) |
| goto out; |
| virtionet_online = ret; |
| ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
| NULL, virtnet_cpu_dead); |
| if (ret) |
| goto err_dead; |
| |
| ret = register_virtio_driver(&virtio_net_driver); |
| if (ret) |
| goto err_virtio; |
| return 0; |
| err_virtio: |
| cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
| err_dead: |
| cpuhp_remove_multi_state(virtionet_online); |
| out: |
| return ret; |
| } |
| module_init(virtio_net_driver_init); |
| |
| static __exit void virtio_net_driver_exit(void) |
| { |
| cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
| cpuhp_remove_multi_state(virtionet_online); |
| unregister_virtio_driver(&virtio_net_driver); |
| } |
| module_exit(virtio_net_driver_exit); |
| |
| MODULE_DEVICE_TABLE(virtio, id_table); |
| MODULE_DESCRIPTION("Virtio network driver"); |
| MODULE_LICENSE("GPL"); |