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3438 lines
88 KiB
3438 lines
88 KiB
// 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 <[email protected]> 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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|
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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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|
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#define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
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|
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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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|
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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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|
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#define VIRTIO_XDP_FLAG BIT(0) |
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|
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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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|
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#define VIRTNET_DRIVER_VERSION "1.0.0" |
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|
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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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|
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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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}; |
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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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|
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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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|
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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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}; |
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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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|
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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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|
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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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|
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/* Name of the send queue: output.$index */ |
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char name[40]; |
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|
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struct virtnet_sq_stats stats; |
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|
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struct napi_struct napi; |
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}; |
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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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|
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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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|
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/* Chain pages by the private ptr. */ |
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struct page *pages; |
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|
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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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|
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/* Page frag for packet buffer allocation. */ |
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struct page_frag alloc_frag; |
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|
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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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|
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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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|
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/* Name of this receive queue: input.$index */ |
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char name[40]; |
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|
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struct xdp_rxq_info xdp_rxq; |
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}; |
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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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|
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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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|
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/* Max # of queue pairs supported by the device */ |
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u16 max_queue_pairs; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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/* Suppress further interrupts. */ |
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virtqueue_disable_cb(vq); |
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|
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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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|
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p = page_address(page) + offset; |
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hdr_p = p; |
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|
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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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|
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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 - len - headroom - (hdr_padded_len - hdr_len); |
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buf = p - headroom; |
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|
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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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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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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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|
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/* |
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* Verify that we can indeed put this data into a skb. |
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* This is here to handle cases when the device erroneously |
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* tries to receive more than is possible. This is usually |
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* the case of a broken device. |
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*/ |
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if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { |
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net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
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dev_kfree_skb(skb); |
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return NULL; |
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} |
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BUG_ON(offset >= PAGE_SIZE); |
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while (len) { |
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unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
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skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, |
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frag_size, truesize); |
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len -= frag_size; |
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page = (struct page *)page->private; |
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offset = 0; |
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} |
|
|
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if (page) |
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give_pages(rq, page); |
|
|
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ok: |
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/* hdr_valid means no XDP, so we can copy the vnet header */ |
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if (hdr_valid) { |
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hdr = skb_vnet_hdr(skb); |
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memcpy(hdr, hdr_p, hdr_len); |
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} |
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if (page_to_free) |
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put_page(page_to_free); |
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|
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if (metasize) { |
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__skb_pull(skb, metasize); |
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skb_metadata_set(skb, metasize); |
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} |
|
|
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return skb; |
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} |
|
|
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static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, |
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struct send_queue *sq, |
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struct xdp_frame *xdpf) |
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{ |
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struct virtio_net_hdr_mrg_rxbuf *hdr; |
|
int err; |
|
|
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if (unlikely(xdpf->headroom < vi->hdr_len)) |
|
return -EOVERFLOW; |
|
|
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/* 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; |
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memset(hdr, 0, vi->hdr_len); |
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xdpf->len += vi->hdr_len; |
|
|
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sg_init_one(sq->sg, xdpf->data, xdpf->len); |
|
|
|
err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf), |
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GFP_ATOMIC); |
|
if (unlikely(err)) |
|
return -ENOSPC; /* Caller handle free/refcnt */ |
|
|
|
return 0; |
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} |
|
|
|
/* 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 |
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* three issues at the same time: 1. the choice of sq. 2. judge and execute the |
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* lock/unlock of txq 3. make sparse happy. It is difficult for two inline |
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* functions to perfectly solve these three problems at the same time. |
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*/ |
|
#define virtnet_xdp_get_sq(vi) ({ \ |
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int cpu = smp_processor_id(); \ |
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struct netdev_queue *txq; \ |
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typeof(vi) v = (vi); \ |
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unsigned int qp; \ |
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\ |
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if (v->curr_queue_pairs > nr_cpu_ids) { \ |
|
qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ |
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qp += cpu; \ |
|
txq = netdev_get_tx_queue(v->dev, qp); \ |
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__netif_tx_acquire(txq); \ |
|
} else { \ |
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qp = cpu % v->curr_queue_pairs; \ |
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txq = netdev_get_tx_queue(v->dev, qp); \ |
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__netif_tx_lock(txq, cpu); \ |
|
} \ |
|
v->sq + qp; \ |
|
}) |
|
|
|
#define virtnet_xdp_put_sq(vi, q) { \ |
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struct netdev_queue *txq; \ |
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typeof(vi) v = (vi); \ |
|
\ |
|
txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ |
|
if (v->curr_queue_pairs > nr_cpu_ids) \ |
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__netif_tx_release(txq); \ |
|
else \ |
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__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_len; |
|
} |
|
rcu_read_lock(); |
|
xdp_prog = rcu_dereference(rq->xdp_prog); |
|
if (xdp_prog) { |
|
struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
|
struct xdp_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(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(); |
|
|
|
skb = build_skb(buf, buflen); |
|
if (!skb) { |
|
put_page(page); |
|
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); |
|
|
|
err: |
|
return skb; |
|
|
|
err_xdp: |
|
rcu_read_unlock(); |
|
stats->xdp_drops++; |
|
err_len: |
|
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; |
|
} |
|
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(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(); |
|
|
|
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, 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; |
|
} 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_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_next(-1, 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 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(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 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, |
|
}; |
|
|
|
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)) |
|
virtio_cread_bytes(vdev, |
|
offsetof(struct virtio_net_config, mac), |
|
dev->dev_addr, dev->addr_len); |
|
else |
|
eth_hw_addr_random(dev); |
|
|
|
/* Set up our device-specific information */ |
|
vi = netdev_priv(dev); |
|
vi->dev = dev; |
|
vi->vdev = vdev; |
|
vdev->priv = vi; |
|
|
|
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: |
|
vi->vdev->config->reset(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) |
|
{ |
|
vi->vdev->config->reset(vi->vdev); |
|
|
|
/* Free unused buffers in both send and recv, if any. */ |
|
free_unused_bufs(vi); |
|
|
|
free_receive_bufs(vi); |
|
|
|
free_receive_page_frags(vi); |
|
|
|
virtnet_del_vqs(vi); |
|
} |
|
|
|
static void virtnet_remove(struct virtio_device *vdev) |
|
{ |
|
struct virtnet_info *vi = vdev->priv; |
|
|
|
virtnet_cpu_notif_remove(vi); |
|
|
|
/* Make sure no work handler is accessing the device. */ |
|
flush_work(&vi->config_work); |
|
|
|
unregister_netdev(vi->dev); |
|
|
|
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");
|
|
|