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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* A network driver using virtio.
- *
- * Copyright 2007 Rusty Russell <[email protected]> IBM Corporation
- */
- //#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 <linux/filter.h>
- #include <linux/kernel.h>
- #include <net/route.h>
- #include <net/xdp.h>
- #include <net/net_failover.h>
- static int napi_weight = NAPI_POLL_WEIGHT;
- module_param(napi_weight, int, 0444);
- static bool csum = true, gso = true, napi_tx = true;
- 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
- /* Separating two types of XDP xmit */
- #define VIRTIO_XDP_TX BIT(0)
- #define VIRTIO_XDP_REDIR BIT(1)
- #define VIRTIO_XDP_FLAG BIT(0)
- /* Timestamp length */
- #define HW_TIMESTAMP_LEN 8
- /* Guest can handle H/W timestamp in. */
- #define VIRTIO_NET_F_GUEST_TS 50
- /* H/W timestamp */
- #define VIRTIO_NET_HDR_F_TIMESTAMP 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, 0, 64)
- #define VIRTNET_DRIVER_VERSION "1.0.0"
- static const unsigned long guest_offloads[] = {
- VIRTIO_NET_F_GUEST_TSO4,
- VIRTIO_NET_F_GUEST_TSO6,
- VIRTIO_NET_F_GUEST_ECN,
- VIRTIO_NET_F_GUEST_UFO,
- VIRTIO_NET_F_GUEST_CSUM
- };
- #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
- (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
- (1ULL << VIRTIO_NET_F_GUEST_ECN) | \
- (1ULL << VIRTIO_NET_F_GUEST_UFO))
- struct virtnet_stat_desc {
- char desc[ETH_GSTRING_LEN];
- size_t offset;
- };
- struct virtnet_sq_stats {
- struct u64_stats_sync syncp;
- u64 packets;
- u64 bytes;
- u64 xdp_tx;
- u64 xdp_tx_drops;
- u64 kicks;
- u64 tx_timeouts;
- };
- struct virtnet_rq_stats {
- struct u64_stats_sync syncp;
- u64 packets;
- u64 bytes;
- u64 drops;
- u64 xdp_packets;
- u64 xdp_tx;
- u64 xdp_redirects;
- u64 xdp_drops;
- u64 kicks;
- };
- #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
- #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
- static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
- { "packets", VIRTNET_SQ_STAT(packets) },
- { "bytes", VIRTNET_SQ_STAT(bytes) },
- { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
- { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
- { "kicks", VIRTNET_SQ_STAT(kicks) },
- { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) },
- };
- static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
- { "packets", VIRTNET_RQ_STAT(packets) },
- { "bytes", VIRTNET_RQ_STAT(bytes) },
- { "drops", VIRTNET_RQ_STAT(drops) },
- { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
- { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
- { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
- { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
- { "kicks", VIRTNET_RQ_STAT(kicks) },
- };
- #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
- #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
- /* 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.$index */
- char name[40];
- struct virtnet_sq_stats stats;
- struct napi_struct napi;
- /* Record whether sq is in reset state. */
- bool reset;
- };
- /* Internal representation of a receive virtqueue */
- struct receive_queue {
- /* Virtqueue associated with this receive_queue */
- struct virtqueue *vq;
- struct napi_struct napi;
- struct bpf_prog __rcu *xdp_prog;
- struct virtnet_rq_stats stats;
- /* Chain pages by the private ptr. */
- struct page *pages;
- /* Average packet length for mergeable receive buffers. */
- struct ewma_pkt_len mrg_avg_pkt_len;
- /* Page frag for packet buffer allocation. */
- struct page_frag alloc_frag;
- /* RX: fragments + linear part + virtio header */
- struct scatterlist sg[MAX_SKB_FRAGS + 2];
- /* Min single buffer size for mergeable buffers case. */
- unsigned int min_buf_len;
- /* Name of this receive queue: input.$index */
- char name[40];
- struct xdp_rxq_info xdp_rxq;
- };
- /* This structure can contain rss message with maximum settings for indirection table and keysize
- * Note, that default structure that describes RSS configuration virtio_net_rss_config
- * contains same info but can't handle table values.
- * In any case, structure would be passed to virtio hw through sg_buf split by parts
- * because table sizes may be differ according to the device configuration.
- */
- #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40
- #define VIRTIO_NET_RSS_MAX_TABLE_LEN 128
- struct virtio_net_ctrl_rss {
- u32 hash_types;
- u16 indirection_table_mask;
- u16 unclassified_queue;
- u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN];
- u16 max_tx_vq;
- u8 hash_key_length;
- u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE];
- };
- /* Control VQ buffers: protected by the rtnl lock */
- struct control_buf {
- struct virtio_net_ctrl_hdr hdr;
- virtio_net_ctrl_ack status;
- struct virtio_net_ctrl_mq mq;
- u8 promisc;
- u8 allmulti;
- __virtio16 vid;
- __virtio64 offloads;
- struct virtio_net_ctrl_rss rss;
- struct virtio_net_ctrl_coal_tx coal_tx;
- struct virtio_net_ctrl_coal_rx coal_rx;
- };
- 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;
- /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
- bool xdp_enabled;
- /* I like... big packets and I cannot lie! */
- bool big_packets;
- /* number of sg entries allocated for big packets */
- unsigned int big_packets_num_skbfrags;
- /* Host will merge rx buffers for big packets (shake it! shake it!) */
- bool mergeable_rx_bufs;
- /* Host supports rss and/or hash report */
- bool has_rss;
- bool has_rss_hash_report;
- u8 rss_key_size;
- u16 rss_indir_table_size;
- u32 rss_hash_types_supported;
- u32 rss_hash_types_saved;
- /* 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;
- /* Work struct for delayed refilling if we run low on memory. */
- struct delayed_work refill;
- /* Is delayed refill enabled? */
- bool refill_enabled;
- /* The lock to synchronize the access to refill_enabled */
- spinlock_t refill_lock;
- /* 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;
- struct control_buf *ctrl;
- /* Ethtool settings */
- u8 duplex;
- u32 speed;
- /* Interrupt coalescing settings */
- u32 tx_usecs;
- u32 rx_usecs;
- u32 tx_max_packets;
- u32 rx_max_packets;
- unsigned long guest_offloads;
- unsigned long guest_offloads_capable;
- /* failover when STANDBY feature enabled */
- struct failover *failover;
- /* RX H/W timestamp control */
- bool rx_hwts_enabled;
- };
- struct padded_vnet_hdr {
- struct virtio_net_hdr_v1_hash 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[12];
- };
- static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf);
- static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf);
- static bool is_xdp_frame(void *ptr)
- {
- return (unsigned long)ptr & VIRTIO_XDP_FLAG;
- }
- static void *xdp_to_ptr(struct xdp_frame *ptr)
- {
- return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
- }
- static struct xdp_frame *ptr_to_xdp(void *ptr)
- {
- return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
- }
- /* 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 enable_delayed_refill(struct virtnet_info *vi)
- {
- spin_lock_bh(&vi->refill_lock);
- vi->refill_enabled = true;
- spin_unlock_bh(&vi->refill_lock);
- }
- static void disable_delayed_refill(struct virtnet_info *vi)
- {
- spin_lock_bh(&vi->refill_lock);
- vi->refill_enabled = false;
- spin_unlock_bh(&vi->refill_lock);
- }
- 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)) {
- if (unlikely(virtqueue_poll(vq, opaque)))
- virtqueue_napi_schedule(napi, vq);
- } else {
- virtqueue_disable_cb(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));
- }
- #define MRG_CTX_HEADER_SHIFT 22
- static void *mergeable_len_to_ctx(unsigned int truesize,
- unsigned int headroom)
- {
- return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
- }
- static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
- {
- return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
- }
- static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
- {
- return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 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,
- bool hdr_valid, unsigned int metasize,
- unsigned int headroom)
- {
- struct sk_buff *skb;
- struct virtio_net_hdr_mrg_rxbuf *hdr;
- unsigned int copy, hdr_len, hdr_padded_len;
- struct page *page_to_free = NULL;
- int tailroom, shinfo_size;
- char *p, *hdr_p, *buf;
- p = page_address(page) + offset;
- hdr_p = p;
- hdr_len = vi->hdr_len;
- if (vi->mergeable_rx_bufs)
- hdr_padded_len = hdr_len;
- else
- hdr_padded_len = sizeof(struct padded_vnet_hdr);
- /* If headroom is not 0, there is an offset between the beginning of the
- * data and the allocated space, otherwise the data and the allocated
- * space are aligned.
- *
- * Buffers with headroom use PAGE_SIZE as alloc size, see
- * add_recvbuf_mergeable() + get_mergeable_buf_len()
- */
- truesize = headroom ? PAGE_SIZE : truesize;
- tailroom = truesize - headroom;
- buf = p - headroom;
- len -= hdr_len;
- offset += hdr_padded_len;
- p += hdr_padded_len;
- tailroom -= hdr_padded_len + len;
- shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- /* copy small packet so we can reuse these pages */
- if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
- skb = build_skb(buf, truesize);
- if (unlikely(!skb))
- return NULL;
- skb_reserve(skb, p - buf);
- skb_put(skb, len);
- page = (struct page *)page->private;
- if (page)
- give_pages(rq, page);
- goto ok;
- }
- /* 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;
- /* Copy all frame if it fits skb->head, otherwise
- * we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
- */
- if (len <= skb_tailroom(skb))
- copy = len;
- else
- copy = ETH_HLEN + metasize;
- 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
- page_to_free = page;
- goto ok;
- }
- /*
- * 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);
- ok:
- /* hdr_valid means no XDP, so we can copy the vnet header */
- if (hdr_valid) {
- hdr = skb_vnet_hdr(skb);
- memcpy(hdr, hdr_p, hdr_len);
- }
- if (page_to_free)
- put_page(page_to_free);
- if (metasize) {
- __skb_pull(skb, metasize);
- skb_metadata_set(skb, metasize);
- }
- return skb;
- }
- static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
- struct send_queue *sq,
- struct xdp_frame *xdpf)
- {
- struct virtio_net_hdr_mrg_rxbuf *hdr;
- int err;
- if (unlikely(xdpf->headroom < vi->hdr_len))
- return -EOVERFLOW;
- /* Make room for virtqueue hdr (also change xdpf->headroom?) */
- xdpf->data -= vi->hdr_len;
- /* Zero header and leave csum up to XDP layers */
- hdr = xdpf->data;
- memset(hdr, 0, vi->hdr_len);
- xdpf->len += vi->hdr_len;
- sg_init_one(sq->sg, xdpf->data, xdpf->len);
- err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf),
- GFP_ATOMIC);
- if (unlikely(err))
- return -ENOSPC; /* Caller handle free/refcnt */
- return 0;
- }
- /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on
- * the current cpu, so it does not need to be locked.
- *
- * Here we use marco instead of inline functions because we have to deal with
- * three issues at the same time: 1. the choice of sq. 2. judge and execute the
- * lock/unlock of txq 3. make sparse happy. It is difficult for two inline
- * functions to perfectly solve these three problems at the same time.
- */
- #define virtnet_xdp_get_sq(vi) ({ \
- int cpu = smp_processor_id(); \
- struct netdev_queue *txq; \
- typeof(vi) v = (vi); \
- unsigned int qp; \
- \
- if (v->curr_queue_pairs > nr_cpu_ids) { \
- qp = v->curr_queue_pairs - v->xdp_queue_pairs; \
- qp += cpu; \
- txq = netdev_get_tx_queue(v->dev, qp); \
- __netif_tx_acquire(txq); \
- } else { \
- qp = cpu % v->curr_queue_pairs; \
- txq = netdev_get_tx_queue(v->dev, qp); \
- __netif_tx_lock(txq, cpu); \
- } \
- v->sq + qp; \
- })
- #define virtnet_xdp_put_sq(vi, q) { \
- struct netdev_queue *txq; \
- typeof(vi) v = (vi); \
- \
- txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \
- if (v->curr_queue_pairs > nr_cpu_ids) \
- __netif_tx_release(txq); \
- else \
- __netif_tx_unlock(txq); \
- }
- static int virtnet_xdp_xmit(struct net_device *dev,
- int n, struct xdp_frame **frames, u32 flags)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- struct receive_queue *rq = vi->rq;
- struct bpf_prog *xdp_prog;
- struct send_queue *sq;
- unsigned int len;
- int packets = 0;
- int bytes = 0;
- int nxmit = 0;
- int kicks = 0;
- void *ptr;
- int ret;
- int i;
- /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this
- * indicate XDP resources have been successfully allocated.
- */
- xdp_prog = rcu_access_pointer(rq->xdp_prog);
- if (!xdp_prog)
- return -ENXIO;
- sq = virtnet_xdp_get_sq(vi);
- if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
- ret = -EINVAL;
- goto out;
- }
- /* Free up any pending old buffers before queueing new ones. */
- while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
- if (likely(is_xdp_frame(ptr))) {
- struct xdp_frame *frame = ptr_to_xdp(ptr);
- bytes += frame->len;
- xdp_return_frame(frame);
- } else {
- struct sk_buff *skb = ptr;
- bytes += skb->len;
- napi_consume_skb(skb, false);
- }
- packets++;
- }
- for (i = 0; i < n; i++) {
- struct xdp_frame *xdpf = frames[i];
- if (__virtnet_xdp_xmit_one(vi, sq, xdpf))
- break;
- nxmit++;
- }
- ret = nxmit;
- if (flags & XDP_XMIT_FLUSH) {
- if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
- kicks = 1;
- }
- out:
- u64_stats_update_begin(&sq->stats.syncp);
- sq->stats.bytes += bytes;
- sq->stats.packets += packets;
- sq->stats.xdp_tx += n;
- sq->stats.xdp_tx_drops += n - nxmit;
- sq->stats.kicks += kicks;
- u64_stats_update_end(&sq->stats.syncp);
- virtnet_xdp_put_sq(vi, sq);
- return ret;
- }
- static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
- {
- return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0;
- }
- /* We copy the packet for XDP in the following cases:
- *
- * 1) Packet is scattered across multiple rx buffers.
- * 2) Headroom space is insufficient.
- *
- * This is inefficient but it's a temporary condition that
- * we hit right after XDP is enabled and until queue is refilled
- * with large buffers with sufficient headroom - so it should affect
- * at most queue size packets.
- * Afterwards, the conditions to enable
- * XDP should preclude the underlying device from sending packets
- * across multiple buffers (num_buf > 1), and we make sure buffers
- * have enough headroom.
- */
- static struct page *xdp_linearize_page(struct receive_queue *rq,
- u16 *num_buf,
- struct page *p,
- int offset,
- int page_off,
- unsigned int *len)
- {
- int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- struct page *page;
- if (page_off + *len + tailroom > PAGE_SIZE)
- return NULL;
- page = alloc_page(GFP_ATOMIC);
- 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 + tailroom) > 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_small(struct net_device *dev,
- struct virtnet_info *vi,
- struct receive_queue *rq,
- void *buf, void *ctx,
- unsigned int len,
- unsigned int *xdp_xmit,
- struct virtnet_rq_stats *stats)
- {
- struct sk_buff *skb;
- struct bpf_prog *xdp_prog;
- unsigned int xdp_headroom = (unsigned long)ctx;
- 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));
- struct page *page = virt_to_head_page(buf);
- unsigned int delta = 0;
- struct page *xdp_page;
- int err;
- unsigned int metasize = 0;
- len -= vi->hdr_len;
- stats->bytes += len;
- if (unlikely(len > GOOD_PACKET_LEN)) {
- pr_debug("%s: rx error: len %u exceeds max size %d\n",
- dev->name, len, GOOD_PACKET_LEN);
- dev->stats.rx_length_errors++;
- goto err;
- }
- if (likely(!vi->xdp_enabled)) {
- xdp_prog = NULL;
- goto skip_xdp;
- }
- 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_frame *xdpf;
- struct xdp_buff xdp;
- void *orig_data;
- u32 act;
- if (unlikely(hdr->hdr.gso_type))
- goto err_xdp;
- if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) {
- int offset = buf - page_address(page) + header_offset;
- unsigned int tlen = len + vi->hdr_len;
- u16 num_buf = 1;
- xdp_headroom = virtnet_get_headroom(vi);
- header_offset = VIRTNET_RX_PAD + xdp_headroom;
- headroom = vi->hdr_len + header_offset;
- buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) +
- SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
- xdp_page = xdp_linearize_page(rq, &num_buf, page,
- offset, header_offset,
- &tlen);
- if (!xdp_page)
- goto err_xdp;
- buf = page_address(xdp_page);
- put_page(page);
- page = xdp_page;
- }
- xdp_init_buff(&xdp, buflen, &rq->xdp_rxq);
- xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len,
- xdp_headroom, len, true);
- orig_data = xdp.data;
- act = bpf_prog_run_xdp(xdp_prog, &xdp);
- stats->xdp_packets++;
- switch (act) {
- case XDP_PASS:
- /* Recalculate length in case bpf program changed it */
- delta = orig_data - xdp.data;
- len = xdp.data_end - xdp.data;
- metasize = xdp.data - xdp.data_meta;
- break;
- case XDP_TX:
- stats->xdp_tx++;
- xdpf = xdp_convert_buff_to_frame(&xdp);
- if (unlikely(!xdpf))
- goto err_xdp;
- err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
- if (unlikely(!err)) {
- xdp_return_frame_rx_napi(xdpf);
- } else if (unlikely(err < 0)) {
- trace_xdp_exception(vi->dev, xdp_prog, act);
- goto err_xdp;
- }
- *xdp_xmit |= VIRTIO_XDP_TX;
- rcu_read_unlock();
- goto xdp_xmit;
- case XDP_REDIRECT:
- stats->xdp_redirects++;
- err = xdp_do_redirect(dev, &xdp, xdp_prog);
- if (err)
- goto err_xdp;
- *xdp_xmit |= VIRTIO_XDP_REDIR;
- rcu_read_unlock();
- goto xdp_xmit;
- default:
- bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act);
- fallthrough;
- case XDP_ABORTED:
- trace_xdp_exception(vi->dev, xdp_prog, act);
- goto err_xdp;
- case XDP_DROP:
- goto err_xdp;
- }
- }
- rcu_read_unlock();
- skip_xdp:
- skb = build_skb(buf, buflen);
- if (!skb)
- goto err;
- skb_reserve(skb, headroom - delta);
- skb_put(skb, len);
- if (!xdp_prog) {
- buf += header_offset;
- memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
- } /* keep zeroed vnet hdr since XDP is loaded */
- if (metasize)
- skb_metadata_set(skb, metasize);
- return skb;
- err_xdp:
- rcu_read_unlock();
- stats->xdp_drops++;
- err:
- stats->drops++;
- put_page(page);
- 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 virtnet_rq_stats *stats)
- {
- struct page *page = buf;
- struct sk_buff *skb =
- page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0, 0);
- stats->bytes += len - vi->hdr_len;
- if (unlikely(!skb))
- goto err;
- return skb;
- err:
- stats->drops++;
- give_pages(rq, page);
- 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,
- unsigned int *xdp_xmit,
- struct virtnet_rq_stats *stats)
- {
- 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 = mergeable_ctx_to_truesize(ctx);
- unsigned int headroom = mergeable_ctx_to_headroom(ctx);
- unsigned int metasize = 0;
- unsigned int frame_sz;
- int err;
- head_skb = NULL;
- stats->bytes += len - vi->hdr_len;
- if (unlikely(len > truesize)) {
- 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;
- }
- if (likely(!vi->xdp_enabled)) {
- xdp_prog = NULL;
- goto skip_xdp;
- }
- rcu_read_lock();
- xdp_prog = rcu_dereference(rq->xdp_prog);
- if (xdp_prog) {
- struct xdp_frame *xdpf;
- struct page *xdp_page;
- struct xdp_buff xdp;
- void *data;
- u32 act;
- /* Transient failure which in theory could occur if
- * in-flight packets from before XDP was enabled reach
- * the receive path after XDP is loaded.
- */
- if (unlikely(hdr->hdr.gso_type))
- goto err_xdp;
- /* Buffers with headroom use PAGE_SIZE as alloc size,
- * see add_recvbuf_mergeable() + get_mergeable_buf_len()
- */
- frame_sz = headroom ? PAGE_SIZE : truesize;
- /* This happens when rx buffer size is underestimated
- * or headroom is not enough because of the buffer
- * was refilled before XDP is set. This should only
- * happen for the first several packets, so we don't
- * care much about its performance.
- */
- if (unlikely(num_buf > 1 ||
- headroom < virtnet_get_headroom(vi))) {
- /* linearize data for XDP */
- xdp_page = xdp_linearize_page(rq, &num_buf,
- page, offset,
- VIRTIO_XDP_HEADROOM,
- &len);
- frame_sz = PAGE_SIZE;
- if (!xdp_page)
- goto err_xdp;
- offset = VIRTIO_XDP_HEADROOM;
- } else {
- xdp_page = page;
- }
- /* 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_init_buff(&xdp, frame_sz - vi->hdr_len, &rq->xdp_rxq);
- xdp_prepare_buff(&xdp, data - VIRTIO_XDP_HEADROOM + vi->hdr_len,
- VIRTIO_XDP_HEADROOM, len - vi->hdr_len, true);
- act = bpf_prog_run_xdp(xdp_prog, &xdp);
- stats->xdp_packets++;
- switch (act) {
- case XDP_PASS:
- metasize = xdp.data - xdp.data_meta;
- /* recalculate offset to account for any header
- * adjustments and minus the metasize to copy the
- * metadata in page_to_skb(). Note other cases do not
- * build an skb and avoid using offset
- */
- offset = xdp.data - page_address(xdp_page) -
- vi->hdr_len - metasize;
- /* recalculate len if xdp.data, xdp.data_end or
- * xdp.data_meta were adjusted
- */
- len = xdp.data_end - xdp.data + vi->hdr_len + metasize;
- /* recalculate headroom if xdp.data or xdp_data_meta
- * were adjusted, note that offset should always point
- * to the start of the reserved bytes for virtio_net
- * header which are followed by xdp.data, that means
- * that offset is equal to the headroom (when buf is
- * starting at the beginning of the page, otherwise
- * there is a base offset inside the page) but it's used
- * with a different starting point (buf start) than
- * xdp.data (buf start + vnet hdr size). If xdp.data or
- * data_meta were adjusted by the xdp prog then the
- * headroom size has changed and so has the offset, we
- * can use data_hard_start, which points at buf start +
- * vnet hdr size, to calculate the new headroom and use
- * it later to compute buf start in page_to_skb()
- */
- headroom = xdp.data - xdp.data_hard_start - metasize;
- /* 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, false,
- metasize,
- headroom);
- return head_skb;
- }
- break;
- case XDP_TX:
- stats->xdp_tx++;
- xdpf = xdp_convert_buff_to_frame(&xdp);
- if (unlikely(!xdpf)) {
- if (unlikely(xdp_page != page))
- put_page(xdp_page);
- goto err_xdp;
- }
- err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
- if (unlikely(!err)) {
- xdp_return_frame_rx_napi(xdpf);
- } else if (unlikely(err < 0)) {
- trace_xdp_exception(vi->dev, xdp_prog, act);
- if (unlikely(xdp_page != page))
- put_page(xdp_page);
- goto err_xdp;
- }
- *xdp_xmit |= VIRTIO_XDP_TX;
- if (unlikely(xdp_page != page))
- put_page(page);
- rcu_read_unlock();
- goto xdp_xmit;
- case XDP_REDIRECT:
- stats->xdp_redirects++;
- err = xdp_do_redirect(dev, &xdp, xdp_prog);
- if (err) {
- if (unlikely(xdp_page != page))
- put_page(xdp_page);
- goto err_xdp;
- }
- *xdp_xmit |= VIRTIO_XDP_REDIR;
- if (unlikely(xdp_page != page))
- put_page(page);
- rcu_read_unlock();
- goto xdp_xmit;
- default:
- bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act);
- fallthrough;
- case XDP_ABORTED:
- trace_xdp_exception(vi->dev, xdp_prog, act);
- fallthrough;
- case XDP_DROP:
- if (unlikely(xdp_page != page))
- __free_pages(xdp_page, 0);
- goto err_xdp;
- }
- }
- rcu_read_unlock();
- skip_xdp:
- head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
- metasize, headroom);
- 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(!buf)) {
- 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;
- }
- stats->bytes += len;
- page = virt_to_head_page(buf);
- truesize = mergeable_ctx_to_truesize(ctx);
- if (unlikely(len > truesize)) {
- 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;
- }
- 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();
- stats->xdp_drops++;
- err_skb:
- put_page(page);
- while (num_buf-- > 1) {
- 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;
- }
- stats->bytes += len;
- page = virt_to_head_page(buf);
- put_page(page);
- }
- err_buf:
- stats->drops++;
- dev_kfree_skb(head_skb);
- xdp_xmit:
- return NULL;
- }
- static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash,
- struct sk_buff *skb)
- {
- enum pkt_hash_types rss_hash_type;
- if (!hdr_hash || !skb)
- return;
- switch (__le16_to_cpu(hdr_hash->hash_report)) {
- case VIRTIO_NET_HASH_REPORT_TCPv4:
- case VIRTIO_NET_HASH_REPORT_UDPv4:
- case VIRTIO_NET_HASH_REPORT_TCPv6:
- case VIRTIO_NET_HASH_REPORT_UDPv6:
- case VIRTIO_NET_HASH_REPORT_TCPv6_EX:
- case VIRTIO_NET_HASH_REPORT_UDPv6_EX:
- rss_hash_type = PKT_HASH_TYPE_L4;
- break;
- case VIRTIO_NET_HASH_REPORT_IPv4:
- case VIRTIO_NET_HASH_REPORT_IPv6:
- case VIRTIO_NET_HASH_REPORT_IPv6_EX:
- rss_hash_type = PKT_HASH_TYPE_L3;
- break;
- case VIRTIO_NET_HASH_REPORT_NONE:
- default:
- rss_hash_type = PKT_HASH_TYPE_NONE;
- }
- skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type);
- }
- static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq,
- void *buf, unsigned int len, void **ctx,
- unsigned int *xdp_xmit,
- struct virtnet_rq_stats *stats)
- {
- struct net_device *dev = vi->dev;
- struct sk_buff *skb;
- struct virtio_net_hdr_mrg_rxbuf *hdr;
- struct skb_shared_hwtstamps *ts;
- s64 hwts;
- 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;
- }
- if (vi->mergeable_rx_bufs)
- skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit,
- stats);
- else if (vi->big_packets)
- skb = receive_big(dev, vi, rq, buf, len, stats);
- else
- skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats);
- if (unlikely(!skb))
- return;
- hdr = skb_vnet_hdr(skb);
- if (hdr->hdr.flags & VIRTIO_NET_HDR_F_TIMESTAMP) {
- stats->bytes -= HW_TIMESTAMP_LEN;
- skb_copy_bits(skb, skb->len - HW_TIMESTAMP_LEN, &hwts, HW_TIMESTAMP_LEN);
- pskb_trim(skb, skb->len - HW_TIMESTAMP_LEN);
- if (vi->rx_hwts_enabled) {
- ts = skb_hwtstamps(skb);
- if (ts)
- ts->hwtstamp = ns_to_ktime(virtio64_to_cpu(vi->vdev, hwts));
- }
- }
- if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report)
- virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb);
- 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_record_rx_queue(skb, vq2rxq(rq->vq));
- 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;
- frame_err:
- dev->stats.rx_frame_errors++;
- dev_kfree_skb(skb);
- }
- /* Unlike mergeable buffers, all buffers are allocated to the
- * same size, except for the headroom. For this reason we do
- * not need to use mergeable_len_to_ctx here - it is enough
- * to store the headroom as the context ignoring the truesize.
- */
- 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);
- void *ctx = (void *)(unsigned long)xdp_headroom;
- 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_ctx(rq->vq, rq->sg, 1, buf, ctx, 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, vi->big_packets_num_skbfrags + 2);
- /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */
- for (i = vi->big_packets_num_skbfrags + 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, vi->big_packets_num_skbfrags + 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,
- unsigned int room)
- {
- struct virtnet_info *vi = rq->vq->vdev->priv;
- const size_t hdr_len = vi->hdr_len;
- unsigned int len;
- if (room)
- return PAGE_SIZE - room;
- 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);
- unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
- unsigned int room = SKB_DATA_ALIGN(headroom + tailroom);
- char *buf;
- void *ctx;
- int err;
- unsigned int len, hole;
- /* Extra tailroom is needed to satisfy XDP's assumption. This
- * means rx frags coalescing won't work, but consider we've
- * disabled GSO for XDP, it won't be a big issue.
- */
- len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room);
- if (unlikely(!skb_page_frag_refill(len + room, 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 */
- get_page(alloc_frag->page);
- alloc_frag->offset += len + room;
- hole = alloc_frag->size - alloc_frag->offset;
- if (hole < len + room) {
- /* To avoid internal fragmentation, if there is very likely not
- * enough space for another buffer, add the remaining space to
- * the current buffer.
- */
- len += hole;
- alloc_frag->offset += hole;
- }
- sg_init_one(rq->sg, buf, len);
- ctx = mergeable_len_to_ctx(len, headroom);
- 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;
- 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);
- if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
- unsigned long flags;
- flags = u64_stats_update_begin_irqsave(&rq->stats.syncp);
- rq->stats.kicks++;
- u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
- }
- 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,
- unsigned int *xdp_xmit)
- {
- struct virtnet_info *vi = rq->vq->vdev->priv;
- struct virtnet_rq_stats stats = {};
- unsigned int len;
- void *buf;
- int i;
- if (!vi->big_packets || vi->mergeable_rx_bufs) {
- void *ctx;
- while (stats.packets < budget &&
- (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) {
- receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats);
- stats.packets++;
- }
- } else {
- while (stats.packets < budget &&
- (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) {
- receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats);
- stats.packets++;
- }
- }
- if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) {
- if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
- spin_lock(&vi->refill_lock);
- if (vi->refill_enabled)
- schedule_delayed_work(&vi->refill, 0);
- spin_unlock(&vi->refill_lock);
- }
- }
- u64_stats_update_begin(&rq->stats.syncp);
- for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) {
- size_t offset = virtnet_rq_stats_desc[i].offset;
- u64 *item;
- item = (u64 *)((u8 *)&rq->stats + offset);
- *item += *(u64 *)((u8 *)&stats + offset);
- }
- u64_stats_update_end(&rq->stats.syncp);
- return stats.packets;
- }
- static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi)
- {
- unsigned int len;
- unsigned int packets = 0;
- unsigned int bytes = 0;
- void *ptr;
- while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
- if (likely(!is_xdp_frame(ptr))) {
- struct sk_buff *skb = ptr;
- pr_debug("Sent skb %p\n", skb);
- bytes += skb->len;
- napi_consume_skb(skb, in_napi);
- } else {
- struct xdp_frame *frame = ptr_to_xdp(ptr);
- bytes += frame->len;
- xdp_return_frame(frame);
- }
- packets++;
- }
- /* Avoid overhead when no packets have been processed
- * happens when called speculatively from start_xmit.
- */
- if (!packets)
- return;
- u64_stats_update_begin(&sq->stats.syncp);
- sq->stats.bytes += bytes;
- sq->stats.packets += packets;
- u64_stats_update_end(&sq->stats.syncp);
- }
- 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 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 || is_xdp_raw_buffer_queue(vi, index))
- return;
- if (__netif_tx_trylock(txq)) {
- if (sq->reset) {
- __netif_tx_unlock(txq);
- return;
- }
- do {
- virtqueue_disable_cb(sq->vq);
- free_old_xmit_skbs(sq, true);
- } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq)));
- if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
- netif_tx_wake_queue(txq);
- __netif_tx_unlock(txq);
- }
- }
- static int virtnet_poll(struct napi_struct *napi, int budget)
- {
- struct receive_queue *rq =
- container_of(napi, struct receive_queue, napi);
- struct virtnet_info *vi = rq->vq->vdev->priv;
- struct send_queue *sq;
- unsigned int received;
- unsigned int xdp_xmit = 0;
- virtnet_poll_cleantx(rq);
- received = virtnet_receive(rq, budget, &xdp_xmit);
- if (xdp_xmit & VIRTIO_XDP_REDIR)
- xdp_do_flush();
- /* Out of packets? */
- if (received < budget)
- virtqueue_napi_complete(napi, rq->vq, received);
- if (xdp_xmit & VIRTIO_XDP_TX) {
- sq = virtnet_xdp_get_sq(vi);
- if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
- u64_stats_update_begin(&sq->stats.syncp);
- sq->stats.kicks++;
- u64_stats_update_end(&sq->stats.syncp);
- }
- virtnet_xdp_put_sq(vi, sq);
- }
- return received;
- }
- static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
- {
- virtnet_napi_tx_disable(&vi->sq[qp_index].napi);
- napi_disable(&vi->rq[qp_index].napi);
- xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
- }
- static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
- {
- struct net_device *dev = vi->dev;
- int err;
- err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index,
- vi->rq[qp_index].napi.napi_id);
- if (err < 0)
- return err;
- err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq,
- MEM_TYPE_PAGE_SHARED, NULL);
- if (err < 0)
- goto err_xdp_reg_mem_model;
- virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
- virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
- return 0;
- err_xdp_reg_mem_model:
- xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
- return err;
- }
- static int virtnet_open(struct net_device *dev)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int i, err;
- enable_delayed_refill(vi);
- 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);
- err = virtnet_enable_queue_pair(vi, i);
- if (err < 0)
- goto err_enable_qp;
- }
- return 0;
- err_enable_qp:
- disable_delayed_refill(vi);
- cancel_delayed_work_sync(&vi->refill);
- for (i--; i >= 0; i--)
- virtnet_disable_queue_pair(vi, i);
- return err;
- }
- 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;
- unsigned int index = vq2txq(sq->vq);
- struct netdev_queue *txq;
- int opaque;
- bool done;
- if (unlikely(is_xdp_raw_buffer_queue(vi, index))) {
- /* We don't need to enable cb for XDP */
- napi_complete_done(napi, 0);
- return 0;
- }
- txq = netdev_get_tx_queue(vi->dev, index);
- __netif_tx_lock(txq, raw_smp_processor_id());
- virtqueue_disable_cb(sq->vq);
- free_old_xmit_skbs(sq, true);
- if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS)
- netif_tx_wake_queue(txq);
- opaque = virtqueue_enable_cb_prepare(sq->vq);
- done = napi_complete_done(napi, 0);
- if (!done)
- virtqueue_disable_cb(sq->vq);
- __netif_tx_unlock(txq);
- if (done) {
- if (unlikely(virtqueue_poll(sq->vq, opaque))) {
- if (napi_schedule_prep(napi)) {
- __netif_tx_lock(txq, raw_smp_processor_id());
- virtqueue_disable_cb(sq->vq);
- __netif_tx_unlock(txq);
- __napi_schedule(napi);
- }
- }
- }
- 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,
- 0))
- return -EPROTO;
- 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 = !netdev_xmit_more();
- bool use_napi = sq->napi.weight;
- /* Free up any pending old buffers before queueing new ones. */
- do {
- if (use_napi)
- virtqueue_disable_cb(sq->vq);
- free_old_xmit_skbs(sq, false);
- } while (use_napi && kick &&
- unlikely(!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_ct(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) {
- if (unlikely(!virtqueue_enable_cb_delayed(sq->vq)))
- virtqueue_napi_schedule(&sq->napi, sq->vq);
- } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
- /* More just got used, free them then recheck. */
- free_old_xmit_skbs(sq, false);
- 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)) {
- if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) {
- u64_stats_update_begin(&sq->stats.syncp);
- sq->stats.kicks++;
- u64_stats_update_end(&sq->stats.syncp);
- }
- }
- return NETDEV_TX_OK;
- }
- static int virtnet_rx_resize(struct virtnet_info *vi,
- struct receive_queue *rq, u32 ring_num)
- {
- bool running = netif_running(vi->dev);
- int err, qindex;
- qindex = rq - vi->rq;
- if (running)
- napi_disable(&rq->napi);
- err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf);
- if (err)
- netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err);
- if (!try_fill_recv(vi, rq, GFP_KERNEL))
- schedule_delayed_work(&vi->refill, 0);
- if (running)
- virtnet_napi_enable(rq->vq, &rq->napi);
- return err;
- }
- static int virtnet_tx_resize(struct virtnet_info *vi,
- struct send_queue *sq, u32 ring_num)
- {
- bool running = netif_running(vi->dev);
- struct netdev_queue *txq;
- int err, qindex;
- qindex = sq - vi->sq;
- if (running)
- virtnet_napi_tx_disable(&sq->napi);
- txq = netdev_get_tx_queue(vi->dev, qindex);
- /* 1. wait all ximt complete
- * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue()
- */
- __netif_tx_lock_bh(txq);
- /* Prevent rx poll from accessing sq. */
- sq->reset = true;
- /* Prevent the upper layer from trying to send packets. */
- netif_stop_subqueue(vi->dev, qindex);
- __netif_tx_unlock_bh(txq);
- err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf);
- if (err)
- netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err);
- __netif_tx_lock_bh(txq);
- sq->reset = false;
- netif_tx_wake_queue(txq);
- __netif_tx_unlock_bh(txq);
- if (running)
- virtnet_napi_tx_enable(vi, sq->vq, &sq->napi);
- return err;
- }
- /*
- * 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;
- int ret;
- /* 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));
- ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
- if (ret < 0) {
- dev_warn(&vi->vdev->dev,
- "Failed to add sgs for command vq: %d\n.", ret);
- return false;
- }
- 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;
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
- return -EOPNOTSUPP;
- 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);
- unsigned int start;
- int i;
- for (i = 0; i < vi->max_queue_pairs; i++) {
- u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops;
- struct receive_queue *rq = &vi->rq[i];
- struct send_queue *sq = &vi->sq[i];
- do {
- start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
- tpackets = sq->stats.packets;
- tbytes = sq->stats.bytes;
- terrors = sq->stats.tx_timeouts;
- } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
- do {
- start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
- rpackets = rq->stats.packets;
- rbytes = rq->stats.bytes;
- rdrops = rq->stats.drops;
- } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
- tot->rx_packets += rpackets;
- tot->tx_packets += tpackets;
- tot->rx_bytes += rbytes;
- tot->tx_bytes += tbytes;
- tot->rx_dropped += rdrops;
- tot->tx_errors += terrors;
- }
- tot->tx_dropped = dev->stats.tx_dropped;
- tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
- tot->rx_length_errors = dev->stats.rx_length_errors;
- tot->rx_frame_errors = dev->stats.rx_frame_errors;
- }
- 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 NAPI doesn't schedule refill work */
- disable_delayed_refill(vi);
- /* Make sure refill_work doesn't re-enable napi! */
- cancel_delayed_work_sync(&vi->refill);
- for (i = 0; i < vi->max_queue_pairs; i++)
- virtnet_disable_queue_pair(vi, i);
- 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 = cpu_to_virtio16(vi->vdev, 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 = cpu_to_virtio16(vi->vdev, 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)
- {
- int i;
- if (vi->affinity_hint_set) {
- for (i = 0; i < vi->max_queue_pairs; i++) {
- virtqueue_set_affinity(vi->rq[i].vq, NULL);
- virtqueue_set_affinity(vi->sq[i].vq, NULL);
- }
- vi->affinity_hint_set = false;
- }
- }
- static void virtnet_set_affinity(struct virtnet_info *vi)
- {
- cpumask_var_t mask;
- int stragglers;
- int group_size;
- int i, j, cpu;
- int num_cpu;
- int stride;
- if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
- virtnet_clean_affinity(vi);
- return;
- }
- num_cpu = num_online_cpus();
- stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1);
- stragglers = num_cpu >= vi->curr_queue_pairs ?
- num_cpu % vi->curr_queue_pairs :
- 0;
- cpu = cpumask_first(cpu_online_mask);
- for (i = 0; i < vi->curr_queue_pairs; i++) {
- group_size = stride + (i < stragglers ? 1 : 0);
- for (j = 0; j < group_size; j++) {
- cpumask_set_cpu(cpu, mask);
- cpu = cpumask_next_wrap(cpu, cpu_online_mask,
- nr_cpu_ids, false);
- }
- virtqueue_set_affinity(vi->rq[i].vq, mask);
- virtqueue_set_affinity(vi->sq[i].vq, mask);
- __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS);
- cpumask_clear(mask);
- }
- vi->affinity_hint_set = true;
- free_cpumask_var(mask);
- }
- 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);
- 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 kernel_ethtool_ringparam *kernel_ring,
- struct netlink_ext_ack *extack)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- ring->rx_max_pending = vi->rq[0].vq->num_max;
- ring->tx_max_pending = vi->sq[0].vq->num_max;
- ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
- ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
- }
- static int virtnet_set_ringparam(struct net_device *dev,
- struct ethtool_ringparam *ring,
- struct kernel_ethtool_ringparam *kernel_ring,
- struct netlink_ext_ack *extack)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- u32 rx_pending, tx_pending;
- struct receive_queue *rq;
- struct send_queue *sq;
- int i, err;
- if (ring->rx_mini_pending || ring->rx_jumbo_pending)
- return -EINVAL;
- rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
- tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
- if (ring->rx_pending == rx_pending &&
- ring->tx_pending == tx_pending)
- return 0;
- if (ring->rx_pending > vi->rq[0].vq->num_max)
- return -EINVAL;
- if (ring->tx_pending > vi->sq[0].vq->num_max)
- return -EINVAL;
- for (i = 0; i < vi->max_queue_pairs; i++) {
- rq = vi->rq + i;
- sq = vi->sq + i;
- if (ring->tx_pending != tx_pending) {
- err = virtnet_tx_resize(vi, sq, ring->tx_pending);
- if (err)
- return err;
- }
- if (ring->rx_pending != rx_pending) {
- err = virtnet_rx_resize(vi, rq, ring->rx_pending);
- if (err)
- return err;
- }
- }
- return 0;
- }
- static bool virtnet_commit_rss_command(struct virtnet_info *vi)
- {
- struct net_device *dev = vi->dev;
- struct scatterlist sgs[4];
- unsigned int sg_buf_size;
- /* prepare sgs */
- sg_init_table(sgs, 4);
- sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table);
- sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size);
- sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1);
- sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size);
- sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key)
- - offsetof(struct virtio_net_ctrl_rss, max_tx_vq);
- sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size);
- sg_buf_size = vi->rss_key_size;
- sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size);
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
- vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
- : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
- dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
- return false;
- }
- return true;
- }
- static void virtnet_init_default_rss(struct virtnet_info *vi)
- {
- u32 indir_val = 0;
- int i = 0;
- vi->ctrl->rss.hash_types = vi->rss_hash_types_supported;
- vi->rss_hash_types_saved = vi->rss_hash_types_supported;
- vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size
- ? vi->rss_indir_table_size - 1 : 0;
- vi->ctrl->rss.unclassified_queue = 0;
- for (; i < vi->rss_indir_table_size; ++i) {
- indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs);
- vi->ctrl->rss.indirection_table[i] = indir_val;
- }
- vi->ctrl->rss.max_tx_vq = vi->has_rss ? vi->curr_queue_pairs : 0;
- vi->ctrl->rss.hash_key_length = vi->rss_key_size;
- netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size);
- }
- static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info)
- {
- info->data = 0;
- switch (info->flow_type) {
- case TCP_V4_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
- info->data = RXH_IP_SRC | RXH_IP_DST |
- RXH_L4_B_0_1 | RXH_L4_B_2_3;
- } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
- info->data = RXH_IP_SRC | RXH_IP_DST;
- }
- break;
- case TCP_V6_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
- info->data = RXH_IP_SRC | RXH_IP_DST |
- RXH_L4_B_0_1 | RXH_L4_B_2_3;
- } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
- info->data = RXH_IP_SRC | RXH_IP_DST;
- }
- break;
- case UDP_V4_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
- info->data = RXH_IP_SRC | RXH_IP_DST |
- RXH_L4_B_0_1 | RXH_L4_B_2_3;
- } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
- info->data = RXH_IP_SRC | RXH_IP_DST;
- }
- break;
- case UDP_V6_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
- info->data = RXH_IP_SRC | RXH_IP_DST |
- RXH_L4_B_0_1 | RXH_L4_B_2_3;
- } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
- info->data = RXH_IP_SRC | RXH_IP_DST;
- }
- break;
- case IPV4_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4)
- info->data = RXH_IP_SRC | RXH_IP_DST;
- break;
- case IPV6_FLOW:
- if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6)
- info->data = RXH_IP_SRC | RXH_IP_DST;
- break;
- default:
- info->data = 0;
- break;
- }
- }
- static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info)
- {
- u32 new_hashtypes = vi->rss_hash_types_saved;
- bool is_disable = info->data & RXH_DISCARD;
- bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3);
- /* supports only 'sd', 'sdfn' and 'r' */
- if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable))
- return false;
- switch (info->flow_type) {
- case TCP_V4_FLOW:
- new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4);
- if (!is_disable)
- new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
- | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0);
- break;
- case UDP_V4_FLOW:
- new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4);
- if (!is_disable)
- new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4
- | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0);
- break;
- case IPV4_FLOW:
- new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4;
- if (!is_disable)
- new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4;
- break;
- case TCP_V6_FLOW:
- new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6);
- if (!is_disable)
- new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
- | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0);
- break;
- case UDP_V6_FLOW:
- new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6);
- if (!is_disable)
- new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6
- | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0);
- break;
- case IPV6_FLOW:
- new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6;
- if (!is_disable)
- new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6;
- break;
- default:
- /* unsupported flow */
- return false;
- }
- /* if unsupported hashtype was set */
- if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported))
- return false;
- if (new_hashtypes != vi->rss_hash_types_saved) {
- vi->rss_hash_types_saved = new_hashtypes;
- vi->ctrl->rss.hash_types = vi->rss_hash_types_saved;
- if (vi->dev->features & NETIF_F_RXHASH)
- return virtnet_commit_rss_command(vi);
- }
- return true;
- }
- 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;
- strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
- strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
- strscpy(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;
- cpus_read_lock();
- err = _virtnet_set_queues(vi, queue_pairs);
- if (err) {
- cpus_read_unlock();
- goto err;
- }
- virtnet_set_affinity(vi);
- cpus_read_unlock();
- netif_set_real_num_tx_queues(dev, queue_pairs);
- netif_set_real_num_rx_queues(dev, queue_pairs);
- err:
- return err;
- }
- static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- unsigned int i, j;
- u8 *p = data;
- switch (stringset) {
- case ETH_SS_STATS:
- for (i = 0; i < vi->curr_queue_pairs; i++) {
- for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++)
- ethtool_sprintf(&p, "rx_queue_%u_%s", i,
- virtnet_rq_stats_desc[j].desc);
- }
- for (i = 0; i < vi->curr_queue_pairs; i++) {
- for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++)
- ethtool_sprintf(&p, "tx_queue_%u_%s", i,
- virtnet_sq_stats_desc[j].desc);
- }
- break;
- }
- }
- static int virtnet_get_sset_count(struct net_device *dev, int sset)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- switch (sset) {
- case ETH_SS_STATS:
- return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
- VIRTNET_SQ_STATS_LEN);
- default:
- return -EOPNOTSUPP;
- }
- }
- static void virtnet_get_ethtool_stats(struct net_device *dev,
- struct ethtool_stats *stats, u64 *data)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- unsigned int idx = 0, start, i, j;
- const u8 *stats_base;
- size_t offset;
- for (i = 0; i < vi->curr_queue_pairs; i++) {
- struct receive_queue *rq = &vi->rq[i];
- stats_base = (u8 *)&rq->stats;
- do {
- start = u64_stats_fetch_begin_irq(&rq->stats.syncp);
- for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) {
- offset = virtnet_rq_stats_desc[j].offset;
- data[idx + j] = *(u64 *)(stats_base + offset);
- }
- } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start));
- idx += VIRTNET_RQ_STATS_LEN;
- }
- for (i = 0; i < vi->curr_queue_pairs; i++) {
- struct send_queue *sq = &vi->sq[i];
- stats_base = (u8 *)&sq->stats;
- do {
- start = u64_stats_fetch_begin_irq(&sq->stats.syncp);
- for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) {
- offset = virtnet_sq_stats_desc[j].offset;
- data[idx + j] = *(u64 *)(stats_base + offset);
- }
- } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start));
- idx += VIRTNET_SQ_STATS_LEN;
- }
- }
- 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 int virtnet_set_link_ksettings(struct net_device *dev,
- const struct ethtool_link_ksettings *cmd)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- return ethtool_virtdev_set_link_ksettings(dev, cmd,
- &vi->speed, &vi->duplex);
- }
- 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 int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
- struct ethtool_coalesce *ec)
- {
- struct scatterlist sgs_tx, sgs_rx;
- vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
- vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
- sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
- VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
- &sgs_tx))
- return -EINVAL;
- /* Save parameters */
- vi->tx_usecs = ec->tx_coalesce_usecs;
- vi->tx_max_packets = ec->tx_max_coalesced_frames;
- vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
- vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
- sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx));
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
- VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
- &sgs_rx))
- return -EINVAL;
- /* Save parameters */
- vi->rx_usecs = ec->rx_coalesce_usecs;
- vi->rx_max_packets = ec->rx_max_coalesced_frames;
- return 0;
- }
- static int virtnet_coal_params_supported(struct ethtool_coalesce *ec)
- {
- /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL
- * feature is negotiated.
- */
- if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs)
- return -EOPNOTSUPP;
- if (ec->tx_max_coalesced_frames > 1 ||
- ec->rx_max_coalesced_frames != 1)
- return -EINVAL;
- return 0;
- }
- static int virtnet_set_coalesce(struct net_device *dev,
- struct ethtool_coalesce *ec,
- struct kernel_ethtool_coalesce *kernel_coal,
- struct netlink_ext_ack *extack)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int ret, i, napi_weight;
- bool update_napi = false;
- /* Can't change NAPI weight if the link is up */
- napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0;
- if (napi_weight ^ vi->sq[0].napi.weight) {
- if (dev->flags & IFF_UP)
- return -EBUSY;
- else
- update_napi = true;
- }
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL))
- ret = virtnet_send_notf_coal_cmds(vi, ec);
- else
- ret = virtnet_coal_params_supported(ec);
- if (ret)
- return ret;
- if (update_napi) {
- for (i = 0; i < vi->max_queue_pairs; i++)
- vi->sq[i].napi.weight = napi_weight;
- }
- return ret;
- }
- static int virtnet_get_coalesce(struct net_device *dev,
- struct ethtool_coalesce *ec,
- struct kernel_ethtool_coalesce *kernel_coal,
- struct netlink_ext_ack *extack)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
- ec->rx_coalesce_usecs = vi->rx_usecs;
- ec->tx_coalesce_usecs = vi->tx_usecs;
- ec->tx_max_coalesced_frames = vi->tx_max_packets;
- ec->rx_max_coalesced_frames = vi->rx_max_packets;
- } else {
- ec->rx_max_coalesced_frames = 1;
- if (vi->sq[0].napi.weight)
- ec->tx_max_coalesced_frames = 1;
- }
- 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 void virtnet_update_settings(struct virtnet_info *vi)
- {
- u32 speed;
- u8 duplex;
- if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX))
- return;
- virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed);
- if (ethtool_validate_speed(speed))
- vi->speed = speed;
- virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex);
- if (ethtool_validate_duplex(duplex))
- vi->duplex = duplex;
- }
- static u32 virtnet_get_rxfh_key_size(struct net_device *dev)
- {
- return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size;
- }
- static u32 virtnet_get_rxfh_indir_size(struct net_device *dev)
- {
- return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size;
- }
- static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int i;
- if (indir) {
- for (i = 0; i < vi->rss_indir_table_size; ++i)
- indir[i] = vi->ctrl->rss.indirection_table[i];
- }
- if (key)
- memcpy(key, vi->ctrl->rss.key, vi->rss_key_size);
- if (hfunc)
- *hfunc = ETH_RSS_HASH_TOP;
- return 0;
- }
- static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int i;
- if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
- return -EOPNOTSUPP;
- if (indir) {
- for (i = 0; i < vi->rss_indir_table_size; ++i)
- vi->ctrl->rss.indirection_table[i] = indir[i];
- }
- if (key)
- memcpy(vi->ctrl->rss.key, key, vi->rss_key_size);
- virtnet_commit_rss_command(vi);
- return 0;
- }
- static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int rc = 0;
- switch (info->cmd) {
- case ETHTOOL_GRXRINGS:
- info->data = vi->curr_queue_pairs;
- break;
- case ETHTOOL_GRXFH:
- virtnet_get_hashflow(vi, info);
- break;
- default:
- rc = -EOPNOTSUPP;
- }
- return rc;
- }
- static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int rc = 0;
- switch (info->cmd) {
- case ETHTOOL_SRXFH:
- if (!virtnet_set_hashflow(vi, info))
- rc = -EINVAL;
- break;
- default:
- rc = -EOPNOTSUPP;
- }
- return rc;
- }
- static int ethtool_op_get_ts_info_plus(struct net_device *dev, struct ethtool_ts_info *eti)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int ret = ethtool_op_get_ts_info(dev, eti);
- if (ret) {
- /* calling the default failed */
- return ret;
- }
- /* set TX */
- eti->tx_types = HWTSTAMP_TX_OFF;
- /* set RX */
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TS)) {
- eti->rx_filters = HWTSTAMP_FILTER_ALL;
- eti->so_timestamping |= (SOF_TIMESTAMPING_RX_HARDWARE
- | SOF_TIMESTAMPING_RAW_HARDWARE);
- } else {
- eti->rx_filters = HWTSTAMP_FILTER_NONE;
- }
- return 0;
- }
- static const struct ethtool_ops virtnet_ethtool_ops = {
- .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
- ETHTOOL_COALESCE_USECS,
- .get_drvinfo = virtnet_get_drvinfo,
- .get_link = ethtool_op_get_link,
- .get_ringparam = virtnet_get_ringparam,
- .set_ringparam = virtnet_set_ringparam,
- .get_strings = virtnet_get_strings,
- .get_sset_count = virtnet_get_sset_count,
- .get_ethtool_stats = virtnet_get_ethtool_stats,
- .set_channels = virtnet_set_channels,
- .get_channels = virtnet_get_channels,
- .get_ts_info = ethtool_op_get_ts_info_plus,
- .get_link_ksettings = virtnet_get_link_ksettings,
- .set_link_ksettings = virtnet_set_link_ksettings,
- .set_coalesce = virtnet_set_coalesce,
- .get_coalesce = virtnet_get_coalesce,
- .get_rxfh_key_size = virtnet_get_rxfh_key_size,
- .get_rxfh_indir_size = virtnet_get_rxfh_indir_size,
- .get_rxfh = virtnet_get_rxfh,
- .set_rxfh = virtnet_set_rxfh,
- .get_rxnfc = virtnet_get_rxnfc,
- .set_rxnfc = virtnet_set_rxnfc,
- };
- static void virtnet_freeze_down(struct virtio_device *vdev)
- {
- struct virtnet_info *vi = vdev->priv;
- /* Make sure no work handler is accessing the device */
- flush_work(&vi->config_work);
- netif_tx_lock_bh(vi->dev);
- netif_device_detach(vi->dev);
- netif_tx_unlock_bh(vi->dev);
- if (netif_running(vi->dev))
- virtnet_close(vi->dev);
- }
- static int init_vqs(struct virtnet_info *vi);
- static int virtnet_restore_up(struct virtio_device *vdev)
- {
- struct virtnet_info *vi = vdev->priv;
- int err;
- err = init_vqs(vi);
- if (err)
- return err;
- virtio_device_ready(vdev);
- enable_delayed_refill(vi);
- if (netif_running(vi->dev)) {
- err = virtnet_open(vi->dev);
- if (err)
- return err;
- }
- netif_tx_lock_bh(vi->dev);
- netif_device_attach(vi->dev);
- netif_tx_unlock_bh(vi->dev);
- return err;
- }
- static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
- {
- struct scatterlist sg;
- vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
- sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
- VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
- dev_warn(&vi->dev->dev, "Fail to set guest offload.\n");
- return -EINVAL;
- }
- return 0;
- }
- static int virtnet_clear_guest_offloads(struct virtnet_info *vi)
- {
- u64 offloads = 0;
- if (!vi->guest_offloads)
- return 0;
- return virtnet_set_guest_offloads(vi, offloads);
- }
- static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
- {
- u64 offloads = vi->guest_offloads;
- if (!vi->guest_offloads)
- return 0;
- return virtnet_set_guest_offloads(vi, offloads);
- }
- 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_CTRL_GUEST_OFFLOADS)
- && (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) ||
- virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) {
- NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM 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) {
- netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n",
- curr_qp + xdp_qp, vi->max_queue_pairs);
- xdp_qp = 0;
- }
- old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
- if (!prog && !old_prog)
- return 0;
- if (prog)
- bpf_prog_add(prog, vi->max_queue_pairs - 1);
- /* Make sure NAPI is not using any XDP TX queues for RX. */
- if (netif_running(dev)) {
- for (i = 0; i < vi->max_queue_pairs; i++) {
- napi_disable(&vi->rq[i].napi);
- virtnet_napi_tx_disable(&vi->sq[i].napi);
- }
- }
- if (!prog) {
- for (i = 0; i < vi->max_queue_pairs; i++) {
- rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
- if (i == 0)
- virtnet_restore_guest_offloads(vi);
- }
- synchronize_net();
- }
- err = _virtnet_set_queues(vi, curr_qp + xdp_qp);
- if (err)
- goto err;
- netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
- vi->xdp_queue_pairs = xdp_qp;
- if (prog) {
- vi->xdp_enabled = true;
- for (i = 0; i < vi->max_queue_pairs; i++) {
- rcu_assign_pointer(vi->rq[i].xdp_prog, prog);
- if (i == 0 && !old_prog)
- virtnet_clear_guest_offloads(vi);
- }
- } else {
- vi->xdp_enabled = false;
- }
- for (i = 0; i < vi->max_queue_pairs; i++) {
- if (old_prog)
- bpf_prog_put(old_prog);
- if (netif_running(dev)) {
- 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;
- err:
- if (!prog) {
- virtnet_clear_guest_offloads(vi);
- for (i = 0; i < vi->max_queue_pairs; i++)
- rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog);
- }
- if (netif_running(dev)) {
- 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);
- }
- }
- if (prog)
- bpf_prog_sub(prog, vi->max_queue_pairs - 1);
- return err;
- }
- static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
- {
- switch (xdp->command) {
- case XDP_SETUP_PROG:
- return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
- default:
- return -EINVAL;
- }
- }
- static int virtnet_get_phys_port_name(struct net_device *dev, char *buf,
- size_t len)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- int ret;
- if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY))
- return -EOPNOTSUPP;
- ret = snprintf(buf, len, "sby");
- if (ret >= len)
- return -EOPNOTSUPP;
- return 0;
- }
- static int virtnet_set_features(struct net_device *dev,
- netdev_features_t features)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- u64 offloads;
- int err;
- if ((dev->features ^ features) & NETIF_F_GRO_HW) {
- if (vi->xdp_enabled)
- return -EBUSY;
- if (features & NETIF_F_GRO_HW)
- offloads = vi->guest_offloads_capable;
- else
- offloads = vi->guest_offloads_capable &
- ~GUEST_OFFLOAD_GRO_HW_MASK;
- err = virtnet_set_guest_offloads(vi, offloads);
- if (err)
- return err;
- vi->guest_offloads = offloads;
- }
- if ((dev->features ^ features) & NETIF_F_RXHASH) {
- if (features & NETIF_F_RXHASH)
- vi->ctrl->rss.hash_types = vi->rss_hash_types_saved;
- else
- vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE;
- if (!virtnet_commit_rss_command(vi))
- return -EINVAL;
- }
- return 0;
- }
- static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue)
- {
- struct virtnet_info *priv = netdev_priv(dev);
- struct send_queue *sq = &priv->sq[txqueue];
- struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue);
- u64_stats_update_begin(&sq->stats.syncp);
- sq->stats.tx_timeouts++;
- u64_stats_update_end(&sq->stats.syncp);
- netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n",
- txqueue, sq->name, sq->vq->index, sq->vq->name,
- jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start)));
- }
- static int virtnet_ioctl(struct net_device *dev, struct ifreq *if_r, int io_cmd)
- {
- struct virtnet_info *vi = netdev_priv(dev);
- struct hwtstamp_config ts_cfg;
- int flag = 0;
- switch (io_cmd) {
- case SIOCGHWTSTAMP:
- memset(&ts_cfg, 0, sizeof(ts_cfg));
- ts_cfg.tx_type = HWTSTAMP_TX_OFF;
- ts_cfg.rx_filter = vi->rx_hwts_enabled ? HWTSTAMP_FILTER_ALL : HWTSTAMP_FILTER_NONE;
- if (copy_to_user(if_r->ifr_data, &ts_cfg, sizeof(ts_cfg)))
- flag = -EFAULT;
- break;
- case SIOCSHWTSTAMP:
- if (copy_from_user(&ts_cfg, if_r->ifr_data, sizeof(ts_cfg))) {
- flag = -EFAULT;
- } else {
- if (ts_cfg.flags || ts_cfg.tx_type != HWTSTAMP_TX_OFF) {
- flag = -EINVAL;
- } else {
- if (ts_cfg.rx_filter != HWTSTAMP_FILTER_NONE)
- ts_cfg.rx_filter = HWTSTAMP_FILTER_ALL;
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TS)) {
- vi->rx_hwts_enabled = (ts_cfg.rx_filter ==
- HWTSTAMP_FILTER_ALL);
- } else {
- vi->rx_hwts_enabled = false;
- ts_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
- }
- if (copy_to_user(if_r->ifr_data, &ts_cfg, sizeof(ts_cfg)))
- flag = -EFAULT;
- }
- }
- break;
- default:
- flag = -EOPNOTSUPP;
- break;
- }
- return flag;
- }
- 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,
- .ndo_bpf = virtnet_xdp,
- .ndo_xdp_xmit = virtnet_xdp_xmit,
- .ndo_features_check = passthru_features_check,
- .ndo_get_phys_port_name = virtnet_get_phys_port_name,
- .ndo_set_features = virtnet_set_features,
- .ndo_tx_timeout = virtnet_tx_timeout,
- .ndo_eth_ioctl = virtnet_ioctl,
- };
- 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) {
- virtnet_update_settings(vi);
- 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++) {
- __netif_napi_del(&vi->rq[i].napi);
- __netif_napi_del(&vi->sq[i].napi);
- }
- /* We called __netif_napi_del(),
- * we need to respect an RCU grace period before freeing vi->rq
- */
- synchronize_net();
- kfree(vi->rq);
- kfree(vi->sq);
- kfree(vi->ctrl);
- }
- 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 void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
- {
- if (!is_xdp_frame(buf))
- dev_kfree_skb(buf);
- else
- xdp_return_frame(ptr_to_xdp(buf));
- }
- static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf)
- {
- struct virtnet_info *vi = vq->vdev->priv;
- int i = vq2rxq(vq);
- 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 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)
- virtnet_sq_free_unused_buf(vq, buf);
- cond_resched();
- }
- for (i = 0; i < vi->max_queue_pairs; i++) {
- struct virtqueue *vq = vi->rq[i].vq;
- while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
- virtnet_rq_free_unused_buf(vq, buf);
- cond_resched();
- }
- }
- static void virtnet_del_vqs(struct virtnet_info *vi)
- {
- struct virtio_device *vdev = vi->vdev;
- virtnet_clean_affinity(vi);
- 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 = vi->hdr_len;
- 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 = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
- if (!vqs)
- goto err_vq;
- callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL);
- if (!callbacks)
- goto err_callback;
- names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL);
- if (!names)
- goto err_names;
- if (!vi->big_packets || vi->mergeable_rx_bufs) {
- ctx = kcalloc(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 = virtio_find_vqs_ctx(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)];
- }
- /* run here: ret == 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;
- if (vi->has_cvq) {
- vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL);
- if (!vi->ctrl)
- goto err_ctrl;
- } else {
- vi->ctrl = NULL;
- }
- vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL);
- if (!vi->sq)
- goto err_sq;
- vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), 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_weight(vi->dev, &vi->rq[i].napi, virtnet_poll,
- napi_weight);
- netif_napi_add_tx_weight(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));
- u64_stats_init(&vi->rq[i].stats.syncp);
- u64_stats_init(&vi->sq[i].stats.syncp);
- }
- return 0;
- err_rq:
- kfree(vi->sq);
- err_sq:
- kfree(vi->ctrl);
- err_ctrl:
- 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;
- cpus_read_lock();
- virtnet_set_affinity(vi);
- cpus_read_unlock();
- 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,
- char *buf)
- {
- struct virtnet_info *vi = netdev_priv(queue->dev);
- unsigned int queue_index = get_netdev_rx_queue_index(queue);
- unsigned int headroom = virtnet_get_headroom(vi);
- unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0;
- 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,
- SKB_DATA_ALIGN(headroom + tailroom)));
- }
- 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") ||
- VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS,
- "VIRTIO_NET_F_CTRL_VQ") ||
- VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT,
- "VIRTIO_NET_F_CTRL_VQ") ||
- VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL,
- "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 bool virtnet_check_guest_gso(const struct virtnet_info *vi)
- {
- return 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);
- }
- static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu)
- {
- bool guest_gso = virtnet_check_guest_gso(vi);
- /* If device can receive ANY guest GSO packets, regardless of mtu,
- * allocate packets of maximum size, otherwise limit it to only
- * mtu size worth only.
- */
- if (mtu > ETH_DATA_LEN || guest_gso) {
- vi->big_packets = true;
- vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE);
- }
- }
- static int virtnet_probe(struct virtio_device *vdev)
- {
- int i, err = -ENOMEM;
- struct net_device *dev;
- struct virtnet_info *vi;
- u16 max_queue_pairs;
- int mtu = 0;
- /* Find if host supports multiqueue/rss virtio_net device */
- max_queue_pairs = 1;
- if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
- max_queue_pairs =
- virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs));
- /* We need at least 2 queue's */
- if (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 |
- IFF_TX_SKB_NO_LINEAR;
- 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_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;
- dev->features |= NETIF_F_GSO_ROBUST;
- if (gso)
- dev->features |= dev->hw_features & NETIF_F_ALL_TSO;
- /* (!csum && gso) case will be fixed by register_netdev() */
- }
- if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM))
- dev->features |= NETIF_F_RXCSUM;
- if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
- virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6))
- dev->features |= NETIF_F_GRO_HW;
- if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS))
- dev->hw_features |= NETIF_F_GRO_HW;
- 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)) {
- u8 addr[ETH_ALEN];
- virtio_cread_bytes(vdev,
- offsetof(struct virtio_net_config, mac),
- addr, ETH_ALEN);
- eth_hw_addr_set(dev, addr);
- } else {
- eth_hw_addr_random(dev);
- dev_info(&vdev->dev, "Assigned random MAC address %pM\n",
- dev->dev_addr);
- }
- /* Set up our device-specific information */
- vi = netdev_priv(dev);
- vi->dev = dev;
- vi->vdev = vdev;
- vdev->priv = vi;
- INIT_WORK(&vi->config_work, virtnet_config_changed_work);
- spin_lock_init(&vi->refill_lock);
- if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
- vi->mergeable_rx_bufs = true;
- if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) {
- vi->rx_usecs = 0;
- vi->tx_usecs = 0;
- vi->tx_max_packets = 0;
- vi->rx_max_packets = 0;
- }
- if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT))
- vi->has_rss_hash_report = true;
- if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS))
- vi->has_rss = true;
- if (vi->has_rss || vi->has_rss_hash_report) {
- vi->rss_indir_table_size =
- virtio_cread16(vdev, offsetof(struct virtio_net_config,
- rss_max_indirection_table_length));
- vi->rss_key_size =
- virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size));
- vi->rss_hash_types_supported =
- virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types));
- vi->rss_hash_types_supported &=
- ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX |
- VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
- VIRTIO_NET_RSS_HASH_TYPE_UDP_EX);
- dev->hw_features |= NETIF_F_RXHASH;
- }
- if (vi->has_rss_hash_report)
- vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash);
- else 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);
- err = -EINVAL;
- goto free;
- }
- dev->mtu = mtu;
- dev->max_mtu = mtu;
- }
- virtnet_set_big_packets(vi, mtu);
- 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;
- #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);
- if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
- vi->failover = net_failover_create(vi->dev);
- if (IS_ERR(vi->failover)) {
- err = PTR_ERR(vi->failover);
- goto free_vqs;
- }
- }
- if (vi->has_rss || vi->has_rss_hash_report)
- virtnet_init_default_rss(vi);
- /* serialize netdev register + virtio_device_ready() with ndo_open() */
- rtnl_lock();
- err = register_netdevice(dev);
- if (err) {
- pr_debug("virtio_net: registering device failed\n");
- rtnl_unlock();
- goto free_failover;
- }
- virtio_device_ready(vdev);
- _virtnet_set_queues(vi, vi->curr_queue_pairs);
- /* a random MAC address has been assigned, notify the device.
- * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there
- * because many devices work fine without getting MAC explicitly
- */
- if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) &&
- virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
- struct scatterlist sg;
- sg_init_one(&sg, dev->dev_addr, dev->addr_len);
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
- VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) {
- pr_debug("virtio_net: setting MAC address failed\n");
- rtnl_unlock();
- err = -EINVAL;
- goto free_unregister_netdev;
- }
- }
- rtnl_unlock();
- err = virtnet_cpu_notif_add(vi);
- if (err) {
- pr_debug("virtio_net: registering cpu notifier failed\n");
- goto free_unregister_netdev;
- }
- /* 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;
- virtnet_update_settings(vi);
- netif_carrier_on(dev);
- }
- for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
- if (virtio_has_feature(vi->vdev, guest_offloads[i]))
- set_bit(guest_offloads[i], &vi->guest_offloads);
- vi->guest_offloads_capable = vi->guest_offloads;
- pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
- dev->name, max_queue_pairs);
- return 0;
- free_unregister_netdev:
- unregister_netdev(dev);
- free_failover:
- net_failover_destroy(vi->failover);
- free_vqs:
- virtio_reset_device(vdev);
- cancel_delayed_work_sync(&vi->refill);
- free_receive_page_frags(vi);
- virtnet_del_vqs(vi);
- free:
- free_netdev(dev);
- return err;
- }
- static void remove_vq_common(struct virtnet_info *vi)
- {
- virtio_reset_device(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);
- net_failover_destroy(vi->failover);
- remove_vq_common(vi);
- free_netdev(vi->dev);
- }
- static __maybe_unused 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 __maybe_unused 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) {
- virtnet_freeze_down(vdev);
- remove_vq_common(vi);
- return err;
- }
- return 0;
- }
- 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, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \
- VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
- VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \
- VIRTIO_NET_F_GUEST_TS
- 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)
- {
- unregister_virtio_driver(&virtio_net_driver);
- cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD);
- cpuhp_remove_multi_state(virtionet_online);
- }
- module_exit(virtio_net_driver_exit);
- MODULE_DEVICE_TABLE(virtio, id_table);
- MODULE_DESCRIPTION("Virtio network driver");
- MODULE_LICENSE("GPL");
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