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-----BEGIN PGP SIGNATURE----- iQHJBAABCgAzFiEEi8GdvG6xMhdgpu/4sUSA/TofvsgFAmHi+xgVHHl1cnkubm9y b3ZAZ21haWwuY29tAAoJELFEgP06H77IxdoMAMf3E+L51Ys/4iAiyJQNVoT3aIBC A8ZVOB9he1OA3o3wBNIRKmICHk+ovnfCWcXTr9fG/Ade2wJz88NAsGPQ1Phywb+s iGlpySllFN72RT9ZqtJhLEzgoHHOL0CzTW07TN9GJy4gQA2h2G9CTP+OmsQdnVqE m9Fn3PSlJ5lhzePlKfnln8rGZFgrriJakfEFPC79n/7an4+2Hvkb5rWigo7KQc4Z 9YNqYUcHWZFUgq80adxEb9LlbMXdD+Z/8fCjOrAatuwVkD4RDt6iKD0mFGjHXGL7 MZ9KRS8AfZXawmetk3jjtsV+/QkeS+Deuu7k0FoO0Th2QV7BGSDhsLXAS5By/MOC nfSyHhnXHzCsBMyVNrJHmNhEZoN29+tRwI84JX9lWcf/OLANcCofnP6f2UIX7tZY CAZAgVELp+0YQXdybrfzTQ8BT3TinjS/aZtCrYijRendI1GwUXcyl69vdOKqAHuk 5jy8k/xHyp+ZWu6v+PyAAAEGowY++qhL0fmszA== =RKW4 -----END PGP SIGNATURE----- Merge tag 'bitmap-5.17-rc1' of git://github.com/norov/linux Pull bitmap updates from Yury Norov: - introduce for_each_set_bitrange() - use find_first_*_bit() instead of find_next_*_bit() where possible - unify for_each_bit() macros * tag 'bitmap-5.17-rc1' of git://github.com/norov/linux: vsprintf: rework bitmap_list_string lib: bitmap: add performance test for bitmap_print_to_pagebuf bitmap: unify find_bit operations mm/percpu: micro-optimize pcpu_is_populated() Replace for_each_*_bit_from() with for_each_*_bit() where appropriate find: micro-optimize for_each_{set,clear}_bit() include/linux: move for_each_bit() macros from bitops.h to find.h cpumask: replace cpumask_next_* with cpumask_first_* where appropriate tools: sync tools/bitmap with mother linux all: replace find_next{,_zero}_bit with find_first{,_zero}_bit where appropriate cpumask: use find_first_and_bit() lib: add find_first_and_bit() arch: remove GENERIC_FIND_FIRST_BIT entirely include: move find.h from asm_generic to linux bitops: move find_bit_*_le functions from le.h to find.h bitops: protect find_first_{,zero}_bit properly
3476 lines
89 KiB
C
3476 lines
89 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* A network driver using virtio.
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*
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* Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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*/
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//#define DEBUG
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/virtio.h>
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#include <linux/virtio_net.h>
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#include <linux/bpf.h>
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#include <linux/bpf_trace.h>
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#include <linux/scatterlist.h>
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#include <linux/if_vlan.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/average.h>
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#include <linux/filter.h>
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#include <linux/kernel.h>
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#include <net/route.h>
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#include <net/xdp.h>
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#include <net/net_failover.h>
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static int napi_weight = NAPI_POLL_WEIGHT;
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module_param(napi_weight, int, 0444);
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static bool csum = true, gso = true, napi_tx = true;
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module_param(csum, bool, 0444);
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module_param(gso, bool, 0444);
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module_param(napi_tx, bool, 0644);
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/* FIXME: MTU in config. */
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#define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
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#define GOOD_COPY_LEN 128
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#define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD)
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/* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */
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#define VIRTIO_XDP_HEADROOM 256
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/* Separating two types of XDP xmit */
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#define VIRTIO_XDP_TX BIT(0)
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#define VIRTIO_XDP_REDIR BIT(1)
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#define VIRTIO_XDP_FLAG BIT(0)
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/* RX packet size EWMA. The average packet size is used to determine the packet
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* buffer size when refilling RX rings. As the entire RX ring may be refilled
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* at once, the weight is chosen so that the EWMA will be insensitive to short-
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* term, transient changes in packet size.
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*/
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DECLARE_EWMA(pkt_len, 0, 64)
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#define VIRTNET_DRIVER_VERSION "1.0.0"
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static const unsigned long guest_offloads[] = {
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VIRTIO_NET_F_GUEST_TSO4,
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VIRTIO_NET_F_GUEST_TSO6,
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VIRTIO_NET_F_GUEST_ECN,
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VIRTIO_NET_F_GUEST_UFO,
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VIRTIO_NET_F_GUEST_CSUM
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};
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#define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
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(1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
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(1ULL << VIRTIO_NET_F_GUEST_ECN) | \
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(1ULL << VIRTIO_NET_F_GUEST_UFO))
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struct virtnet_stat_desc {
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char desc[ETH_GSTRING_LEN];
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size_t offset;
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};
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struct virtnet_sq_stats {
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struct u64_stats_sync syncp;
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u64 packets;
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u64 bytes;
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u64 xdp_tx;
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u64 xdp_tx_drops;
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u64 kicks;
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u64 tx_timeouts;
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};
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struct virtnet_rq_stats {
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struct u64_stats_sync syncp;
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u64 packets;
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u64 bytes;
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u64 drops;
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u64 xdp_packets;
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u64 xdp_tx;
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u64 xdp_redirects;
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u64 xdp_drops;
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u64 kicks;
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};
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#define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m)
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#define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m)
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static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = {
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{ "packets", VIRTNET_SQ_STAT(packets) },
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{ "bytes", VIRTNET_SQ_STAT(bytes) },
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{ "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) },
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{ "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) },
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{ "kicks", VIRTNET_SQ_STAT(kicks) },
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{ "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) },
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};
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static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
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{ "packets", VIRTNET_RQ_STAT(packets) },
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{ "bytes", VIRTNET_RQ_STAT(bytes) },
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{ "drops", VIRTNET_RQ_STAT(drops) },
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{ "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) },
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{ "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) },
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{ "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) },
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{ "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) },
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{ "kicks", VIRTNET_RQ_STAT(kicks) },
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};
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#define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc)
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#define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc)
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/* Internal representation of a send virtqueue */
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struct send_queue {
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/* Virtqueue associated with this send _queue */
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struct virtqueue *vq;
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/* TX: fragments + linear part + virtio header */
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struct scatterlist sg[MAX_SKB_FRAGS + 2];
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/* Name of the send queue: output.$index */
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char name[40];
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struct virtnet_sq_stats stats;
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struct napi_struct napi;
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};
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/* Internal representation of a receive virtqueue */
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struct receive_queue {
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/* Virtqueue associated with this receive_queue */
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struct virtqueue *vq;
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struct napi_struct napi;
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struct bpf_prog __rcu *xdp_prog;
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struct virtnet_rq_stats stats;
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/* Chain pages by the private ptr. */
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struct page *pages;
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/* Average packet length for mergeable receive buffers. */
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struct ewma_pkt_len mrg_avg_pkt_len;
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/* Page frag for packet buffer allocation. */
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struct page_frag alloc_frag;
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/* RX: fragments + linear part + virtio header */
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struct scatterlist sg[MAX_SKB_FRAGS + 2];
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/* Min single buffer size for mergeable buffers case. */
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unsigned int min_buf_len;
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/* Name of this receive queue: input.$index */
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char name[40];
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struct xdp_rxq_info xdp_rxq;
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};
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/* Control VQ buffers: protected by the rtnl lock */
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struct control_buf {
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struct virtio_net_ctrl_hdr hdr;
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virtio_net_ctrl_ack status;
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struct virtio_net_ctrl_mq mq;
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u8 promisc;
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u8 allmulti;
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__virtio16 vid;
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__virtio64 offloads;
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};
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struct virtnet_info {
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struct virtio_device *vdev;
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struct virtqueue *cvq;
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struct net_device *dev;
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struct send_queue *sq;
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struct receive_queue *rq;
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unsigned int status;
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/* Max # of queue pairs supported by the device */
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u16 max_queue_pairs;
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/* # of queue pairs currently used by the driver */
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u16 curr_queue_pairs;
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/* # of XDP queue pairs currently used by the driver */
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u16 xdp_queue_pairs;
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/* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */
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bool xdp_enabled;
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/* I like... big packets and I cannot lie! */
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bool big_packets;
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/* Host will merge rx buffers for big packets (shake it! shake it!) */
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bool mergeable_rx_bufs;
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/* Has control virtqueue */
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bool has_cvq;
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/* Host can handle any s/g split between our header and packet data */
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bool any_header_sg;
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/* Packet virtio header size */
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u8 hdr_len;
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/* Work struct for refilling if we run low on memory. */
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struct delayed_work refill;
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/* Work struct for config space updates */
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struct work_struct config_work;
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/* Does the affinity hint is set for virtqueues? */
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bool affinity_hint_set;
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/* CPU hotplug instances for online & dead */
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struct hlist_node node;
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struct hlist_node node_dead;
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struct control_buf *ctrl;
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/* Ethtool settings */
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u8 duplex;
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u32 speed;
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unsigned long guest_offloads;
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unsigned long guest_offloads_capable;
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/* failover when STANDBY feature enabled */
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struct failover *failover;
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};
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struct padded_vnet_hdr {
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struct virtio_net_hdr_mrg_rxbuf hdr;
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/*
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* hdr is in a separate sg buffer, and data sg buffer shares same page
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* with this header sg. This padding makes next sg 16 byte aligned
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* after the header.
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*/
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char padding[4];
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};
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static bool is_xdp_frame(void *ptr)
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{
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return (unsigned long)ptr & VIRTIO_XDP_FLAG;
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}
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static void *xdp_to_ptr(struct xdp_frame *ptr)
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{
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return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG);
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}
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static struct xdp_frame *ptr_to_xdp(void *ptr)
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{
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return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
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}
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/* Converting between virtqueue no. and kernel tx/rx queue no.
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* 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq
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*/
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static int vq2txq(struct virtqueue *vq)
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{
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return (vq->index - 1) / 2;
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}
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static int txq2vq(int txq)
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{
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return txq * 2 + 1;
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}
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static int vq2rxq(struct virtqueue *vq)
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{
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return vq->index / 2;
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}
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static int rxq2vq(int rxq)
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{
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return rxq * 2;
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}
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static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb)
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{
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return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb;
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}
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/*
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* private is used to chain pages for big packets, put the whole
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* most recent used list in the beginning for reuse
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*/
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static void give_pages(struct receive_queue *rq, struct page *page)
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{
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struct page *end;
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/* Find end of list, sew whole thing into vi->rq.pages. */
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for (end = page; end->private; end = (struct page *)end->private);
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end->private = (unsigned long)rq->pages;
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rq->pages = page;
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}
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static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask)
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{
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struct page *p = rq->pages;
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if (p) {
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rq->pages = (struct page *)p->private;
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/* clear private here, it is used to chain pages */
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p->private = 0;
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} else
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p = alloc_page(gfp_mask);
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return p;
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}
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static void virtqueue_napi_schedule(struct napi_struct *napi,
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struct virtqueue *vq)
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{
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if (napi_schedule_prep(napi)) {
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virtqueue_disable_cb(vq);
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__napi_schedule(napi);
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}
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}
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static void virtqueue_napi_complete(struct napi_struct *napi,
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struct virtqueue *vq, int processed)
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{
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int opaque;
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opaque = virtqueue_enable_cb_prepare(vq);
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if (napi_complete_done(napi, processed)) {
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if (unlikely(virtqueue_poll(vq, opaque)))
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virtqueue_napi_schedule(napi, vq);
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} else {
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virtqueue_disable_cb(vq);
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}
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}
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static void skb_xmit_done(struct virtqueue *vq)
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{
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struct virtnet_info *vi = vq->vdev->priv;
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struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
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/* Suppress further interrupts. */
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virtqueue_disable_cb(vq);
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if (napi->weight)
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virtqueue_napi_schedule(napi, vq);
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else
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/* We were probably waiting for more output buffers. */
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netif_wake_subqueue(vi->dev, vq2txq(vq));
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}
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#define MRG_CTX_HEADER_SHIFT 22
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static void *mergeable_len_to_ctx(unsigned int truesize,
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unsigned int headroom)
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{
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return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize);
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}
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static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx)
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{
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return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT;
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}
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static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx)
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{
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return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1);
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}
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/* Called from bottom half context */
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static struct sk_buff *page_to_skb(struct virtnet_info *vi,
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struct receive_queue *rq,
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struct page *page, unsigned int offset,
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unsigned int len, unsigned int truesize,
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bool hdr_valid, unsigned int metasize,
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unsigned int headroom)
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{
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struct sk_buff *skb;
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struct virtio_net_hdr_mrg_rxbuf *hdr;
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unsigned int copy, hdr_len, hdr_padded_len;
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struct page *page_to_free = NULL;
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int tailroom, shinfo_size;
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char *p, *hdr_p, *buf;
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p = page_address(page) + offset;
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hdr_p = p;
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hdr_len = vi->hdr_len;
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if (vi->mergeable_rx_bufs)
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hdr_padded_len = sizeof(*hdr);
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else
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hdr_padded_len = sizeof(struct padded_vnet_hdr);
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/* If headroom is not 0, there is an offset between the beginning of the
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* data and the allocated space, otherwise the data and the allocated
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* space are aligned.
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*
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* Buffers with headroom use PAGE_SIZE as alloc size, see
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* add_recvbuf_mergeable() + get_mergeable_buf_len()
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*/
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truesize = headroom ? PAGE_SIZE : truesize;
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tailroom = truesize - headroom;
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buf = p - headroom;
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len -= hdr_len;
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offset += hdr_padded_len;
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p += hdr_padded_len;
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tailroom -= hdr_padded_len + len;
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|
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shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
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|
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/* copy small packet so we can reuse these pages */
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if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) {
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skb = build_skb(buf, truesize);
|
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if (unlikely(!skb))
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return NULL;
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|
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skb_reserve(skb, p - buf);
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skb_put(skb, len);
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|
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page = (struct page *)page->private;
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if (page)
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give_pages(rq, page);
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goto ok;
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}
|
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|
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/* copy small packet so we can reuse these pages for small data */
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skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN);
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if (unlikely(!skb))
|
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return NULL;
|
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|
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/* Copy all frame if it fits skb->head, otherwise
|
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* we let virtio_net_hdr_to_skb() and GRO pull headers as needed.
|
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*/
|
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if (len <= skb_tailroom(skb))
|
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copy = len;
|
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else
|
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copy = ETH_HLEN + metasize;
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skb_put_data(skb, p, copy);
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|
|
|
len -= copy;
|
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offset += copy;
|
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|
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if (vi->mergeable_rx_bufs) {
|
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if (len)
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skb_add_rx_frag(skb, 0, page, offset, len, truesize);
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else
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page_to_free = page;
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goto ok;
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}
|
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|
|
/*
|
|
* 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)
|
|
{
|
|
struct page *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) {
|
|
int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
|
|
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;
|
|
/* 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,
|
|
VIRTIO_XDP_HEADROOM);
|
|
return head_skb;
|
|
}
|
|
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);
|
|
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 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;
|
|
|
|
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_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, MAX_SKB_FRAGS + 2);
|
|
|
|
/* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */
|
|
for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
|
|
first = get_a_page(rq, gfp);
|
|
if (!first) {
|
|
if (list)
|
|
give_pages(rq, list);
|
|
return -ENOMEM;
|
|
}
|
|
sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE);
|
|
|
|
/* chain new page in list head to match sg */
|
|
first->private = (unsigned long)list;
|
|
list = first;
|
|
}
|
|
|
|
first = get_a_page(rq, gfp);
|
|
if (!first) {
|
|
give_pages(rq, list);
|
|
return -ENOMEM;
|
|
}
|
|
p = page_address(first);
|
|
|
|
/* rq->sg[0], rq->sg[1] share the same page */
|
|
/* a separated rq->sg[0] for header - required in case !any_header_sg */
|
|
sg_set_buf(&rq->sg[0], p, vi->hdr_len);
|
|
|
|
/* rq->sg[1] for data packet, from offset */
|
|
offset = sizeof(struct padded_vnet_hdr);
|
|
sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset);
|
|
|
|
/* chain first in list head */
|
|
first->private = (unsigned long)list;
|
|
err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2,
|
|
first, gfp);
|
|
if (err < 0)
|
|
give_pages(rq, first);
|
|
|
|
return err;
|
|
}
|
|
|
|
static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
|
|
struct ewma_pkt_len *avg_pkt_len,
|
|
unsigned int room)
|
|
{
|
|
const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
|
|
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))
|
|
schedule_delayed_work(&vi->refill, 0);
|
|
}
|
|
|
|
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)) {
|
|
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);
|
|
|
|
/* Out of packets? */
|
|
if (received < budget)
|
|
virtqueue_napi_complete(napi, rq->vq, received);
|
|
|
|
if (xdp_xmit & VIRTIO_XDP_REDIR)
|
|
xdp_do_flush();
|
|
|
|
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 int virtnet_open(struct net_device *dev)
|
|
{
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
int i, err;
|
|
|
|
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 = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq,
|
|
MEM_TYPE_PAGE_SHARED, NULL);
|
|
if (err < 0) {
|
|
xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
|
|
return err;
|
|
}
|
|
|
|
virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
|
|
virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtnet_poll_tx(struct napi_struct *napi, int budget)
|
|
{
|
|
struct send_queue *sq = container_of(napi, struct send_queue, napi);
|
|
struct virtnet_info *vi = sq->vq->vdev->priv;
|
|
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 &&
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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 refill_work doesn't re-enable napi! */
|
|
cancel_delayed_work_sync(&vi->refill);
|
|
|
|
for (i = 0; i < vi->max_queue_pairs; i++) {
|
|
xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
|
|
napi_disable(&vi->rq[i].napi);
|
|
virtnet_napi_tx_disable(&vi->sq[i].napi);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void virtnet_set_rx_mode(struct net_device *dev)
|
|
{
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
struct scatterlist sg[2];
|
|
struct virtio_net_ctrl_mac *mac_data;
|
|
struct netdev_hw_addr *ha;
|
|
int uc_count;
|
|
int mc_count;
|
|
void *buf;
|
|
int i;
|
|
|
|
/* We can't dynamically set ndo_set_rx_mode, so return gracefully */
|
|
if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
|
|
return;
|
|
|
|
vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
|
|
vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
|
|
|
|
sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
|
|
|
|
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
|
|
VIRTIO_NET_CTRL_RX_PROMISC, sg))
|
|
dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
|
|
vi->ctrl->promisc ? "en" : "dis");
|
|
|
|
sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
|
|
|
|
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
|
|
VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
|
|
dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
|
|
vi->ctrl->allmulti ? "en" : "dis");
|
|
|
|
uc_count = netdev_uc_count(dev);
|
|
mc_count = netdev_mc_count(dev);
|
|
/* MAC filter - use one buffer for both lists */
|
|
buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
|
|
(2 * sizeof(mac_data->entries)), GFP_ATOMIC);
|
|
mac_data = buf;
|
|
if (!buf)
|
|
return;
|
|
|
|
sg_init_table(sg, 2);
|
|
|
|
/* Store the unicast list and count in the front of the buffer */
|
|
mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count);
|
|
i = 0;
|
|
netdev_for_each_uc_addr(ha, dev)
|
|
memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
|
|
|
|
sg_set_buf(&sg[0], mac_data,
|
|
sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
|
|
|
|
/* multicast list and count fill the end */
|
|
mac_data = (void *)&mac_data->macs[uc_count][0];
|
|
|
|
mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count);
|
|
i = 0;
|
|
netdev_for_each_mc_addr(ha, dev)
|
|
memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
|
|
|
|
sg_set_buf(&sg[1], mac_data,
|
|
sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
|
|
|
|
if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
|
|
VIRTIO_NET_CTRL_MAC_TABLE_SET, sg))
|
|
dev_warn(&dev->dev, "Failed to set MAC filter table.\n");
|
|
|
|
kfree(buf);
|
|
}
|
|
|
|
static int virtnet_vlan_rx_add_vid(struct net_device *dev,
|
|
__be16 proto, u16 vid)
|
|
{
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
struct scatterlist sg;
|
|
|
|
vi->ctrl->vid = 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 = virtqueue_get_vring_size(vi->rq[0].vq);
|
|
ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq);
|
|
ring->rx_pending = ring->rx_max_pending;
|
|
ring->tx_pending = ring->tx_max_pending;
|
|
}
|
|
|
|
|
|
static void virtnet_get_drvinfo(struct net_device *dev,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
struct virtio_device *vdev = vi->vdev;
|
|
|
|
strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
|
|
strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
|
|
strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
|
|
|
|
}
|
|
|
|
/* TODO: Eliminate OOO packets during switching */
|
|
static int virtnet_set_channels(struct net_device *dev,
|
|
struct ethtool_channels *channels)
|
|
{
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
u16 queue_pairs = channels->combined_count;
|
|
int err;
|
|
|
|
/* We don't support separate rx/tx channels.
|
|
* We don't allow setting 'other' channels.
|
|
*/
|
|
if (channels->rx_count || channels->tx_count || channels->other_count)
|
|
return -EINVAL;
|
|
|
|
if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0)
|
|
return -EINVAL;
|
|
|
|
/* For now we don't support modifying channels while XDP is loaded
|
|
* also when XDP is loaded all RX queues have XDP programs so we only
|
|
* need to check a single RX queue.
|
|
*/
|
|
if (vi->rq[0].xdp_prog)
|
|
return -EINVAL;
|
|
|
|
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_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 i, napi_weight;
|
|
|
|
if (ec->tx_max_coalesced_frames > 1 ||
|
|
ec->rx_max_coalesced_frames != 1)
|
|
return -EINVAL;
|
|
|
|
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;
|
|
for (i = 0; i < vi->max_queue_pairs; i++)
|
|
vi->sq[i].napi.weight = napi_weight;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 ethtool_coalesce ec_default = {
|
|
.cmd = ETHTOOL_GCOALESCE,
|
|
.rx_max_coalesced_frames = 1,
|
|
};
|
|
struct virtnet_info *vi = netdev_priv(dev);
|
|
|
|
memcpy(ec, &ec_default, sizeof(ec_default));
|
|
|
|
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 const struct ethtool_ops virtnet_ethtool_ops = {
|
|
.supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES,
|
|
.get_drvinfo = virtnet_get_drvinfo,
|
|
.get_link = ethtool_op_get_link,
|
|
.get_ringparam = virtnet_get_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,
|
|
.get_link_ksettings = virtnet_get_link_ksettings,
|
|
.set_link_ksettings = virtnet_set_link_ksettings,
|
|
.set_coalesce = virtnet_set_coalesce,
|
|
.get_coalesce = virtnet_get_coalesce,
|
|
};
|
|
|
|
static void virtnet_freeze_down(struct virtio_device *vdev)
|
|
{
|
|
struct virtnet_info *vi = vdev->priv;
|
|
int i;
|
|
|
|
/* Make sure no work handler is accessing the device */
|
|
flush_work(&vi->config_work);
|
|
|
|
netif_tx_lock_bh(vi->dev);
|
|
netif_device_detach(vi->dev);
|
|
netif_tx_unlock_bh(vi->dev);
|
|
cancel_delayed_work_sync(&vi->refill);
|
|
|
|
if (netif_running(vi->dev)) {
|
|
for (i = 0; i < vi->max_queue_pairs; i++) {
|
|
napi_disable(&vi->rq[i].napi);
|
|
virtnet_napi_tx_disable(&vi->sq[i].napi);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int init_vqs(struct virtnet_info *vi);
|
|
|
|
static int virtnet_restore_up(struct virtio_device *vdev)
|
|
{
|
|
struct virtnet_info *vi = vdev->priv;
|
|
int err, i;
|
|
|
|
err = init_vqs(vi);
|
|
if (err)
|
|
return err;
|
|
|
|
virtio_device_ready(vdev);
|
|
|
|
if (netif_running(vi->dev)) {
|
|
for (i = 0; i < vi->curr_queue_pairs; i++)
|
|
if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
|
|
schedule_delayed_work(&vi->refill, 0);
|
|
|
|
for (i = 0; i < vi->max_queue_pairs; i++) {
|
|
virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi);
|
|
virtnet_napi_tx_enable(vi, vi->sq[i].vq,
|
|
&vi->sq[i].napi);
|
|
}
|
|
}
|
|
|
|
netif_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;
|
|
}
|
|
|
|
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 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,
|
|
};
|
|
|
|
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 free_unused_bufs(struct virtnet_info *vi)
|
|
{
|
|
void *buf;
|
|
int i;
|
|
|
|
for (i = 0; i < vi->max_queue_pairs; i++) {
|
|
struct virtqueue *vq = vi->sq[i].vq;
|
|
while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
|
|
if (!is_xdp_frame(buf))
|
|
dev_kfree_skb(buf);
|
|
else
|
|
xdp_return_frame(ptr_to_xdp(buf));
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < vi->max_queue_pairs; i++) {
|
|
struct virtqueue *vq = vi->rq[i].vq;
|
|
|
|
while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
|
|
if (vi->mergeable_rx_bufs) {
|
|
put_page(virt_to_head_page(buf));
|
|
} else if (vi->big_packets) {
|
|
give_pages(&vi->rq[i], buf);
|
|
} else {
|
|
put_page(virt_to_head_page(buf));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtnet_del_vqs(struct virtnet_info *vi)
|
|
{
|
|
struct virtio_device *vdev = vi->vdev;
|
|
|
|
virtnet_clean_affinity(vi);
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
|
|
virtnet_free_queues(vi);
|
|
}
|
|
|
|
/* How large should a single buffer be so a queue full of these can fit at
|
|
* least one full packet?
|
|
* Logic below assumes the mergeable buffer header is used.
|
|
*/
|
|
static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
|
|
{
|
|
const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
|
|
unsigned int rq_size = virtqueue_get_vring_size(vq);
|
|
unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
|
|
unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
|
|
unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size);
|
|
|
|
return max(max(min_buf_len, hdr_len) - hdr_len,
|
|
(unsigned int)GOOD_PACKET_LEN);
|
|
}
|
|
|
|
static int virtnet_find_vqs(struct virtnet_info *vi)
|
|
{
|
|
vq_callback_t **callbacks;
|
|
struct virtqueue **vqs;
|
|
int ret = -ENOMEM;
|
|
int i, total_vqs;
|
|
const char **names;
|
|
bool *ctx;
|
|
|
|
/* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
|
|
* possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
|
|
* possible control vq.
|
|
*/
|
|
total_vqs = vi->max_queue_pairs * 2 +
|
|
virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ);
|
|
|
|
/* Allocate space for find_vqs parameters */
|
|
vqs = 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(vi->dev, &vi->rq[i].napi, virtnet_poll,
|
|
napi_weight);
|
|
netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx,
|
|
napi_tx ? napi_weight : 0);
|
|
|
|
sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg));
|
|
ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len);
|
|
sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg));
|
|
|
|
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"))) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#define MIN_MTU ETH_MIN_MTU
|
|
#define MAX_MTU ETH_MAX_MTU
|
|
|
|
static int virtnet_validate(struct virtio_device *vdev)
|
|
{
|
|
if (!vdev->config->get) {
|
|
dev_err(&vdev->dev, "%s failure: config access disabled\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!virtnet_validate_features(vdev))
|
|
return -EINVAL;
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
|
|
int mtu = virtio_cread16(vdev,
|
|
offsetof(struct virtio_net_config,
|
|
mtu));
|
|
if (mtu < MIN_MTU)
|
|
__virtio_clear_bit(vdev, VIRTIO_NET_F_MTU);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtnet_probe(struct virtio_device *vdev)
|
|
{
|
|
int i, err = -ENOMEM;
|
|
struct net_device *dev;
|
|
struct virtnet_info *vi;
|
|
u16 max_queue_pairs;
|
|
int mtu;
|
|
|
|
/* Find if host supports multiqueue virtio_net device */
|
|
err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ,
|
|
struct virtio_net_config,
|
|
max_virtqueue_pairs, &max_queue_pairs);
|
|
|
|
/* We need at least 2 queue's */
|
|
if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
|
|
max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
|
|
!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
|
|
max_queue_pairs = 1;
|
|
|
|
/* Allocate ourselves a network device with room for our info */
|
|
dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
/* Set up network device as normal. */
|
|
dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE |
|
|
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);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/* If we can receive ANY GSO packets, we must allocate large ones. */
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
|
|
virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
|
|
virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
|
|
virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
|
|
vi->big_packets = true;
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
|
|
vi->mergeable_rx_bufs = true;
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) ||
|
|
virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
|
|
vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
|
|
else
|
|
vi->hdr_len = sizeof(struct virtio_net_hdr);
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) ||
|
|
virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
|
|
vi->any_header_sg = true;
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ))
|
|
vi->has_cvq = true;
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) {
|
|
mtu = virtio_cread16(vdev,
|
|
offsetof(struct virtio_net_config,
|
|
mtu));
|
|
if (mtu < dev->min_mtu) {
|
|
/* Should never trigger: MTU was previously validated
|
|
* in virtnet_validate.
|
|
*/
|
|
dev_err(&vdev->dev,
|
|
"device MTU appears to have changed it is now %d < %d",
|
|
mtu, dev->min_mtu);
|
|
err = -EINVAL;
|
|
goto free;
|
|
}
|
|
|
|
dev->mtu = mtu;
|
|
dev->max_mtu = mtu;
|
|
|
|
/* TODO: size buffers correctly in this case. */
|
|
if (dev->mtu > ETH_DATA_LEN)
|
|
vi->big_packets = true;
|
|
}
|
|
|
|
if (vi->any_header_sg)
|
|
dev->needed_headroom = vi->hdr_len;
|
|
|
|
/* Enable multiqueue by default */
|
|
if (num_online_cpus() >= max_queue_pairs)
|
|
vi->curr_queue_pairs = max_queue_pairs;
|
|
else
|
|
vi->curr_queue_pairs = num_online_cpus();
|
|
vi->max_queue_pairs = max_queue_pairs;
|
|
|
|
/* Allocate/initialize the rx/tx queues, and invoke find_vqs */
|
|
err = init_vqs(vi);
|
|
if (err)
|
|
goto free;
|
|
|
|
#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;
|
|
}
|
|
}
|
|
|
|
err = register_netdev(dev);
|
|
if (err) {
|
|
pr_debug("virtio_net: registering device failed\n");
|
|
goto free_failover;
|
|
}
|
|
|
|
virtio_device_ready(vdev);
|
|
|
|
err = virtnet_cpu_notif_add(vi);
|
|
if (err) {
|
|
pr_debug("virtio_net: registering cpu notifier failed\n");
|
|
goto free_unregister_netdev;
|
|
}
|
|
|
|
virtnet_set_queues(vi, vi->curr_queue_pairs);
|
|
|
|
/* Assume link up if device can't report link status,
|
|
otherwise get link status from config. */
|
|
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:
|
|
virtio_reset_device(vdev);
|
|
|
|
unregister_netdev(dev);
|
|
free_failover:
|
|
net_failover_destroy(vi->failover);
|
|
free_vqs:
|
|
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
|
|
|
|
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");
|