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/*
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* Virtio Network Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "virtio.h" |
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#include "net.h" |
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#include "net/checksum.h" |
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#include "net/tap.h" |
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#include "qemu-error.h" |
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#include "qemu-timer.h" |
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#include "virtio-net.h" |
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#include "vhost_net.h" |
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#define VIRTIO_NET_VM_VERSION 11 |
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#define MAC_TABLE_ENTRIES 64 |
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#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ |
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typedef struct VirtIONet |
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{ |
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VirtIODevice vdev; |
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uint8_t mac[ETH_ALEN]; |
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uint16_t status; |
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VirtQueue *rx_vq; |
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VirtQueue *tx_vq; |
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VirtQueue *ctrl_vq; |
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NICState *nic; |
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QEMUTimer *tx_timer; |
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int tx_timer_active;
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uint32_t has_vnet_hdr; |
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uint8_t has_ufo; |
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struct {
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VirtQueueElement elem; |
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ssize_t len; |
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} async_tx; |
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int mergeable_rx_bufs;
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uint8_t promisc; |
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uint8_t allmulti; |
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uint8_t alluni; |
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uint8_t nomulti; |
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uint8_t nouni; |
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uint8_t nobcast; |
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uint8_t vhost_started; |
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VMChangeStateEntry *vmstate; |
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struct {
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int in_use;
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int first_multi;
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uint8_t multi_overflow; |
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uint8_t uni_overflow; |
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uint8_t *macs; |
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} mac_table; |
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uint32_t *vlans; |
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} VirtIONet; |
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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static VirtIONet *to_virtio_net(VirtIODevice *vdev)
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{ |
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return (VirtIONet *)vdev;
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} |
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static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_config netcfg;
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netcfg.status = n->status; |
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memcpy(netcfg.mac, n->mac, ETH_ALEN); |
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memcpy(config, &netcfg, sizeof(netcfg));
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} |
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static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_config netcfg;
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memcpy(&netcfg, config, sizeof(netcfg));
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if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
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memcpy(n->mac, netcfg.mac, ETH_ALEN); |
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qemu_format_nic_info_str(&n->nic->nc, n->mac); |
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} |
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} |
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static void virtio_net_set_link_status(VLANClientState *nc) |
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{ |
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VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
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uint16_t old_status = n->status; |
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if (nc->link_down)
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n->status &= ~VIRTIO_NET_S_LINK_UP; |
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else
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n->status |= VIRTIO_NET_S_LINK_UP; |
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if (n->status != old_status)
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virtio_notify_config(&n->vdev); |
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} |
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static void virtio_net_reset(VirtIODevice *vdev) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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/* Reset back to compatibility mode */
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n->promisc = 1;
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n->allmulti = 0;
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n->alluni = 0;
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n->nomulti = 0;
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n->nouni = 0;
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n->nobcast = 0;
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if (n->vhost_started) {
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vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
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n->vhost_started = 0;
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} |
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/* Flush any MAC and VLAN filter table state */
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n->mac_table.in_use = 0;
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n->mac_table.first_multi = 0;
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n->mac_table.multi_overflow = 0;
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n->mac_table.uni_overflow = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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memset(n->vlans, 0, MAX_VLAN >> 3); |
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} |
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static int peer_has_vnet_hdr(VirtIONet *n) |
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{ |
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if (!n->nic->nc.peer)
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return 0; |
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if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP)
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return 0; |
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n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer); |
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return n->has_vnet_hdr;
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} |
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static int peer_has_ufo(VirtIONet *n) |
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{ |
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if (!peer_has_vnet_hdr(n))
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return 0; |
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n->has_ufo = tap_has_ufo(n->nic->nc.peer); |
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return n->has_ufo;
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} |
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static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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features |= (1 << VIRTIO_NET_F_MAC);
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if (peer_has_vnet_hdr(n)) {
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tap_using_vnet_hdr(n->nic->nc.peer, 1);
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} else {
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features &= ~(0x1 << VIRTIO_NET_F_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
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} |
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if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
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} |
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if (!n->nic->nc.peer ||
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n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) { |
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return features;
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} |
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if (!tap_get_vhost_net(n->nic->nc.peer)) {
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return features;
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} |
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return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer), features);
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} |
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static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
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{ |
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uint32_t features = 0;
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/* Linux kernel 2.6.25. It understood MAC (as everyone must),
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* but also these: */
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features |= (1 << VIRTIO_NET_F_MAC);
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features |= (1 << VIRTIO_NET_F_CSUM);
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features |= (1 << VIRTIO_NET_F_HOST_TSO4);
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features |= (1 << VIRTIO_NET_F_HOST_TSO6);
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features |= (1 << VIRTIO_NET_F_HOST_ECN);
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return features;
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} |
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static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
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if (n->has_vnet_hdr) {
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tap_set_offload(n->nic->nc.peer, |
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(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
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(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
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(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
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(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
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(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
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} |
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if (!n->nic->nc.peer ||
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n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) { |
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return;
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} |
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if (!tap_get_vhost_net(n->nic->nc.peer)) {
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return;
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} |
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return vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
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} |
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static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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uint8_t on; |
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) { |
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fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
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exit(1);
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} |
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on = ldub_p(elem->out_sg[1].iov_base);
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if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
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n->promisc = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) |
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n->allmulti = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI) |
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n->alluni = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI) |
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n->nomulti = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI) |
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n->nouni = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST) |
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n->nobcast = on; |
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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} |
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static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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struct virtio_net_ctrl_mac mac_data;
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if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 || |
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elem->out_sg[1].iov_len < sizeof(mac_data) || |
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elem->out_sg[2].iov_len < sizeof(mac_data)) |
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return VIRTIO_NET_ERR;
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n->mac_table.in_use = 0;
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n->mac_table.first_multi = 0;
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n->mac_table.uni_overflow = 0;
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n->mac_table.multi_overflow = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
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if (sizeof(mac_data.entries) + |
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(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), |
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mac_data.entries * ETH_ALEN); |
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n->mac_table.in_use += mac_data.entries; |
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} else {
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n->mac_table.uni_overflow = 1;
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} |
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n->mac_table.first_multi = n->mac_table.in_use; |
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mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
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if (sizeof(mac_data.entries) + |
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(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries) {
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if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN), |
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elem->out_sg[2].iov_base + sizeof(mac_data), |
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mac_data.entries * ETH_ALEN); |
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n->mac_table.in_use += mac_data.entries; |
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} else {
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n->mac_table.multi_overflow = 1;
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} |
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} |
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return VIRTIO_NET_OK;
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} |
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static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
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{ |
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uint16_t vid; |
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
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fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
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return VIRTIO_NET_ERR;
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} |
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vid = lduw_le_p(elem->out_sg[1].iov_base);
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if (vid >= MAX_VLAN)
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return VIRTIO_NET_ERR;
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if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
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n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
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else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
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n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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} |
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static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_ctrl_hdr ctrl;
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virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
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VirtQueueElement elem; |
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while (virtqueue_pop(vq, &elem)) {
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if ((elem.in_num < 1) || (elem.out_num < 1)) { |
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fprintf(stderr, "virtio-net ctrl missing headers\n");
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exit(1);
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} |
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if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
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elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
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fprintf(stderr, "virtio-net ctrl header not in correct element\n");
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exit(1);
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} |
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ctrl.class = ldub_p(elem.out_sg[0].iov_base);
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ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
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if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
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status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); |
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else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
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status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
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else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
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status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
367 |
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stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
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virtqueue_push(vq, &elem, sizeof(status));
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virtio_notify(vdev, vq); |
372 |
} |
373 |
} |
374 |
|
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/* RX */
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|
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static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
378 |
{ |
379 |
VirtIONet *n = to_virtio_net(vdev); |
380 |
|
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qemu_flush_queued_packets(&n->nic->nc); |
382 |
|
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/* We now have RX buffers, signal to the IO thread to break out of the
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* select to re-poll the tap file descriptor */
|
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qemu_notify_event(); |
386 |
} |
387 |
|
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static int virtio_net_can_receive(VLANClientState *nc) |
389 |
{ |
390 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
391 |
|
392 |
if (!virtio_queue_ready(n->rx_vq) ||
|
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
394 |
return 0; |
395 |
|
396 |
return 1; |
397 |
} |
398 |
|
399 |
static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
400 |
{ |
401 |
if (virtio_queue_empty(n->rx_vq) ||
|
402 |
(n->mergeable_rx_bufs && |
403 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
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404 |
virtio_queue_set_notification(n->rx_vq, 1);
|
405 |
|
406 |
/* To avoid a race condition where the guest has made some buffers
|
407 |
* available after the above check but before notification was
|
408 |
* enabled, check for available buffers again.
|
409 |
*/
|
410 |
if (virtio_queue_empty(n->rx_vq) ||
|
411 |
(n->mergeable_rx_bufs && |
412 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
|
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return 0; |
414 |
} |
415 |
|
416 |
virtio_queue_set_notification(n->rx_vq, 0);
|
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return 1; |
418 |
} |
419 |
|
420 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
421 |
* it never finds out that the packets don't have valid checksums. This
|
422 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
423 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
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* dhclient yet.
|
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*
|
426 |
* To avoid breaking existing guests, we catch udp packets and add
|
427 |
* checksums. This is terrible but it's better than hacking the guest
|
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* kernels.
|
429 |
*
|
430 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
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* we should provide a mechanism to disable it to avoid polluting the host
|
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* cache.
|
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*/
|
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static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
435 |
const uint8_t *buf, size_t size)
|
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{ |
437 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
438 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
439 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
440 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
441 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
442 |
/* FIXME this cast is evil */
|
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net_checksum_calculate((uint8_t *)buf, size); |
444 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
445 |
} |
446 |
} |
447 |
|
448 |
static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count) |
449 |
{ |
450 |
int offset, i;
|
451 |
|
452 |
offset = i = 0;
|
453 |
while (offset < count && i < iovcnt) {
|
454 |
int len = MIN(iov[i].iov_len, count - offset);
|
455 |
memcpy(iov[i].iov_base, buf + offset, len); |
456 |
offset += len; |
457 |
i++; |
458 |
} |
459 |
|
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return offset;
|
461 |
} |
462 |
|
463 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
464 |
const void *buf, size_t size, size_t hdr_len) |
465 |
{ |
466 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
467 |
int offset = 0; |
468 |
|
469 |
hdr->flags = 0;
|
470 |
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
471 |
|
472 |
if (n->has_vnet_hdr) {
|
473 |
memcpy(hdr, buf, sizeof(*hdr));
|
474 |
offset = sizeof(*hdr);
|
475 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
476 |
} |
477 |
|
478 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
479 |
* but we may be passing along a larger header to the guest.
|
480 |
*/
|
481 |
iov[0].iov_base += hdr_len;
|
482 |
iov[0].iov_len -= hdr_len;
|
483 |
|
484 |
return offset;
|
485 |
} |
486 |
|
487 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
488 |
{ |
489 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
490 |
static const uint8_t vlan[] = {0x81, 0x00}; |
491 |
uint8_t *ptr = (uint8_t *)buf; |
492 |
int i;
|
493 |
|
494 |
if (n->promisc)
|
495 |
return 1; |
496 |
|
497 |
if (n->has_vnet_hdr) {
|
498 |
ptr += sizeof(struct virtio_net_hdr); |
499 |
} |
500 |
|
501 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
502 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
503 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
504 |
return 0; |
505 |
} |
506 |
|
507 |
if (ptr[0] & 1) { // multicast |
508 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
509 |
return !n->nobcast;
|
510 |
} else if (n->nomulti) { |
511 |
return 0; |
512 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
513 |
return 1; |
514 |
} |
515 |
|
516 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
517 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
518 |
return 1; |
519 |
} |
520 |
} |
521 |
} else { // unicast |
522 |
if (n->nouni) {
|
523 |
return 0; |
524 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
525 |
return 1; |
526 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
527 |
return 1; |
528 |
} |
529 |
|
530 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
531 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
532 |
return 1; |
533 |
} |
534 |
} |
535 |
} |
536 |
|
537 |
return 0; |
538 |
} |
539 |
|
540 |
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
541 |
{ |
542 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
543 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
544 |
size_t hdr_len, offset, i; |
545 |
|
546 |
if (!virtio_net_can_receive(&n->nic->nc))
|
547 |
return -1; |
548 |
|
549 |
if (!virtio_net_has_buffers(n, size))
|
550 |
return 0; |
551 |
|
552 |
if (!receive_filter(n, buf, size))
|
553 |
return size;
|
554 |
|
555 |
/* hdr_len refers to the header we supply to the guest */
|
556 |
hdr_len = n->mergeable_rx_bufs ? |
557 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
558 |
|
559 |
offset = i = 0;
|
560 |
|
561 |
while (offset < size) {
|
562 |
VirtQueueElement elem; |
563 |
int len, total;
|
564 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
565 |
|
566 |
total = 0;
|
567 |
|
568 |
if ((i != 0 && !n->mergeable_rx_bufs) || |
569 |
virtqueue_pop(n->rx_vq, &elem) == 0) {
|
570 |
if (i == 0) |
571 |
return -1; |
572 |
fprintf(stderr, "virtio-net truncating packet\n");
|
573 |
exit(1);
|
574 |
} |
575 |
|
576 |
if (elem.in_num < 1) { |
577 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
578 |
exit(1);
|
579 |
} |
580 |
|
581 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { |
582 |
fprintf(stderr, "virtio-net header not in first element\n");
|
583 |
exit(1);
|
584 |
} |
585 |
|
586 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
587 |
|
588 |
if (i == 0) { |
589 |
if (n->mergeable_rx_bufs)
|
590 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
591 |
|
592 |
offset += receive_header(n, sg, elem.in_num, |
593 |
buf + offset, size - offset, hdr_len); |
594 |
total += hdr_len; |
595 |
} |
596 |
|
597 |
/* copy in packet. ugh */
|
598 |
len = iov_fill(sg, elem.in_num, |
599 |
buf + offset, size - offset); |
600 |
total += len; |
601 |
|
602 |
/* signal other side */
|
603 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
604 |
|
605 |
offset += len; |
606 |
} |
607 |
|
608 |
if (mhdr)
|
609 |
mhdr->num_buffers = i; |
610 |
|
611 |
virtqueue_flush(n->rx_vq, i); |
612 |
virtio_notify(&n->vdev, n->rx_vq); |
613 |
|
614 |
return size;
|
615 |
} |
616 |
|
617 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); |
618 |
|
619 |
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len) |
620 |
{ |
621 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
622 |
|
623 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
624 |
virtio_notify(&n->vdev, n->tx_vq); |
625 |
|
626 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
627 |
|
628 |
virtio_queue_set_notification(n->tx_vq, 1);
|
629 |
virtio_net_flush_tx(n, n->tx_vq); |
630 |
} |
631 |
|
632 |
/* TX */
|
633 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
634 |
{ |
635 |
VirtQueueElement elem; |
636 |
|
637 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
638 |
return;
|
639 |
|
640 |
if (n->async_tx.elem.out_num) {
|
641 |
virtio_queue_set_notification(n->tx_vq, 0);
|
642 |
return;
|
643 |
} |
644 |
|
645 |
while (virtqueue_pop(vq, &elem)) {
|
646 |
ssize_t ret, len = 0;
|
647 |
unsigned int out_num = elem.out_num; |
648 |
struct iovec *out_sg = &elem.out_sg[0]; |
649 |
unsigned hdr_len;
|
650 |
|
651 |
/* hdr_len refers to the header received from the guest */
|
652 |
hdr_len = n->mergeable_rx_bufs ? |
653 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
654 |
sizeof(struct virtio_net_hdr); |
655 |
|
656 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
657 |
fprintf(stderr, "virtio-net header not in first element\n");
|
658 |
exit(1);
|
659 |
} |
660 |
|
661 |
/* ignore the header if GSO is not supported */
|
662 |
if (!n->has_vnet_hdr) {
|
663 |
out_num--; |
664 |
out_sg++; |
665 |
len += hdr_len; |
666 |
} else if (n->mergeable_rx_bufs) { |
667 |
/* tapfd expects a struct virtio_net_hdr */
|
668 |
hdr_len -= sizeof(struct virtio_net_hdr); |
669 |
out_sg->iov_len -= hdr_len; |
670 |
len += hdr_len; |
671 |
} |
672 |
|
673 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
674 |
virtio_net_tx_complete); |
675 |
if (ret == 0) { |
676 |
virtio_queue_set_notification(n->tx_vq, 0);
|
677 |
n->async_tx.elem = elem; |
678 |
n->async_tx.len = len; |
679 |
return;
|
680 |
} |
681 |
|
682 |
len += ret; |
683 |
|
684 |
virtqueue_push(vq, &elem, len); |
685 |
virtio_notify(&n->vdev, vq); |
686 |
} |
687 |
} |
688 |
|
689 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
690 |
{ |
691 |
VirtIONet *n = to_virtio_net(vdev); |
692 |
|
693 |
if (n->tx_timer_active) {
|
694 |
virtio_queue_set_notification(vq, 1);
|
695 |
qemu_del_timer(n->tx_timer); |
696 |
n->tx_timer_active = 0;
|
697 |
virtio_net_flush_tx(n, vq); |
698 |
} else {
|
699 |
qemu_mod_timer(n->tx_timer, |
700 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
701 |
n->tx_timer_active = 1;
|
702 |
virtio_queue_set_notification(vq, 0);
|
703 |
} |
704 |
} |
705 |
|
706 |
static void virtio_net_tx_timer(void *opaque) |
707 |
{ |
708 |
VirtIONet *n = opaque; |
709 |
|
710 |
n->tx_timer_active = 0;
|
711 |
|
712 |
/* Just in case the driver is not ready on more */
|
713 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
714 |
return;
|
715 |
|
716 |
virtio_queue_set_notification(n->tx_vq, 1);
|
717 |
virtio_net_flush_tx(n, n->tx_vq); |
718 |
} |
719 |
|
720 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
721 |
{ |
722 |
VirtIONet *n = opaque; |
723 |
|
724 |
if (n->vhost_started) {
|
725 |
/* TODO: should we really stop the backend?
|
726 |
* If we don't, it might keep writing to memory. */
|
727 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); |
728 |
n->vhost_started = 0;
|
729 |
} |
730 |
virtio_save(&n->vdev, f); |
731 |
|
732 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
733 |
qemu_put_be32(f, n->tx_timer_active); |
734 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
735 |
qemu_put_be16(f, n->status); |
736 |
qemu_put_byte(f, n->promisc); |
737 |
qemu_put_byte(f, n->allmulti); |
738 |
qemu_put_be32(f, n->mac_table.in_use); |
739 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
740 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
741 |
qemu_put_be32(f, n->has_vnet_hdr); |
742 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
743 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
744 |
qemu_put_byte(f, n->alluni); |
745 |
qemu_put_byte(f, n->nomulti); |
746 |
qemu_put_byte(f, n->nouni); |
747 |
qemu_put_byte(f, n->nobcast); |
748 |
qemu_put_byte(f, n->has_ufo); |
749 |
} |
750 |
|
751 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
752 |
{ |
753 |
VirtIONet *n = opaque; |
754 |
int i;
|
755 |
|
756 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
757 |
return -EINVAL;
|
758 |
|
759 |
virtio_load(&n->vdev, f); |
760 |
|
761 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
762 |
n->tx_timer_active = qemu_get_be32(f); |
763 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
764 |
|
765 |
if (version_id >= 3) |
766 |
n->status = qemu_get_be16(f); |
767 |
|
768 |
if (version_id >= 4) { |
769 |
if (version_id < 8) { |
770 |
n->promisc = qemu_get_be32(f); |
771 |
n->allmulti = qemu_get_be32(f); |
772 |
} else {
|
773 |
n->promisc = qemu_get_byte(f); |
774 |
n->allmulti = qemu_get_byte(f); |
775 |
} |
776 |
} |
777 |
|
778 |
if (version_id >= 5) { |
779 |
n->mac_table.in_use = qemu_get_be32(f); |
780 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
781 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
782 |
qemu_get_buffer(f, n->mac_table.macs, |
783 |
n->mac_table.in_use * ETH_ALEN); |
784 |
} else if (n->mac_table.in_use) { |
785 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
786 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
787 |
n->mac_table.in_use = 0;
|
788 |
} |
789 |
} |
790 |
|
791 |
if (version_id >= 6) |
792 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
793 |
|
794 |
if (version_id >= 7) { |
795 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
796 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
797 |
return -1; |
798 |
} |
799 |
|
800 |
if (n->has_vnet_hdr) {
|
801 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
802 |
tap_set_offload(n->nic->nc.peer, |
803 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
804 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
805 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
806 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
807 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
808 |
} |
809 |
} |
810 |
|
811 |
if (version_id >= 9) { |
812 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
813 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
814 |
} |
815 |
|
816 |
if (version_id >= 10) { |
817 |
n->alluni = qemu_get_byte(f); |
818 |
n->nomulti = qemu_get_byte(f); |
819 |
n->nouni = qemu_get_byte(f); |
820 |
n->nobcast = qemu_get_byte(f); |
821 |
} |
822 |
|
823 |
if (version_id >= 11) { |
824 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
825 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
826 |
return -1; |
827 |
} |
828 |
} |
829 |
|
830 |
/* Find the first multicast entry in the saved MAC filter */
|
831 |
for (i = 0; i < n->mac_table.in_use; i++) { |
832 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
833 |
break;
|
834 |
} |
835 |
} |
836 |
n->mac_table.first_multi = i; |
837 |
|
838 |
if (n->tx_timer_active) {
|
839 |
qemu_mod_timer(n->tx_timer, |
840 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
841 |
} |
842 |
return 0; |
843 |
} |
844 |
|
845 |
static void virtio_net_cleanup(VLANClientState *nc) |
846 |
{ |
847 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
848 |
|
849 |
n->nic = NULL;
|
850 |
} |
851 |
|
852 |
static NetClientInfo net_virtio_info = {
|
853 |
.type = NET_CLIENT_TYPE_NIC, |
854 |
.size = sizeof(NICState),
|
855 |
.can_receive = virtio_net_can_receive, |
856 |
.receive = virtio_net_receive, |
857 |
.cleanup = virtio_net_cleanup, |
858 |
.link_status_changed = virtio_net_set_link_status, |
859 |
}; |
860 |
|
861 |
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) |
862 |
{ |
863 |
VirtIONet *n = to_virtio_net(vdev); |
864 |
if (!n->nic->nc.peer) {
|
865 |
return;
|
866 |
} |
867 |
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
|
868 |
return;
|
869 |
} |
870 |
|
871 |
if (!tap_get_vhost_net(n->nic->nc.peer)) {
|
872 |
return;
|
873 |
} |
874 |
if (!!n->vhost_started == !!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
875 |
return;
|
876 |
} |
877 |
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
|
878 |
int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), vdev);
|
879 |
if (r < 0) { |
880 |
fprintf(stderr, "unable to start vhost net: %d: "
|
881 |
"falling back on userspace virtio\n", -r);
|
882 |
} else {
|
883 |
n->vhost_started = 1;
|
884 |
} |
885 |
} else {
|
886 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
887 |
n->vhost_started = 0;
|
888 |
} |
889 |
} |
890 |
|
891 |
static void virtio_net_vmstate_change(void *opaque, int running, int reason) |
892 |
{ |
893 |
VirtIONet *n = opaque; |
894 |
if (!running) {
|
895 |
return;
|
896 |
} |
897 |
/* This is called when vm is started, it will start vhost backend if
|
898 |
* appropriate e.g. after migration. */
|
899 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
900 |
} |
901 |
|
902 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf) |
903 |
{ |
904 |
VirtIONet *n; |
905 |
static int virtio_net_id; |
906 |
|
907 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
908 |
sizeof(struct virtio_net_config), |
909 |
sizeof(VirtIONet));
|
910 |
|
911 |
n->vdev.get_config = virtio_net_get_config; |
912 |
n->vdev.set_config = virtio_net_set_config; |
913 |
n->vdev.get_features = virtio_net_get_features; |
914 |
n->vdev.set_features = virtio_net_set_features; |
915 |
n->vdev.bad_features = virtio_net_bad_features; |
916 |
n->vdev.reset = virtio_net_reset; |
917 |
n->vdev.set_status = virtio_net_set_status; |
918 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
919 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
920 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
921 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
922 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
923 |
n->status = VIRTIO_NET_S_LINK_UP; |
924 |
|
925 |
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n); |
926 |
|
927 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
928 |
|
929 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
930 |
n->tx_timer_active = 0;
|
931 |
n->mergeable_rx_bufs = 0;
|
932 |
n->promisc = 1; /* for compatibility */ |
933 |
|
934 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
935 |
|
936 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
937 |
|
938 |
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
|
939 |
virtio_net_save, virtio_net_load, n); |
940 |
n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n); |
941 |
|
942 |
return &n->vdev;
|
943 |
} |
944 |
|
945 |
void virtio_net_exit(VirtIODevice *vdev)
|
946 |
{ |
947 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
948 |
qemu_del_vm_change_state_handler(n->vmstate); |
949 |
|
950 |
if (n->vhost_started) {
|
951 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
952 |
} |
953 |
|
954 |
qemu_purge_queued_packets(&n->nic->nc); |
955 |
|
956 |
unregister_savevm("virtio-net", n);
|
957 |
|
958 |
qemu_free(n->mac_table.macs); |
959 |
qemu_free(n->vlans); |
960 |
|
961 |
qemu_del_timer(n->tx_timer); |
962 |
qemu_free_timer(n->tx_timer); |
963 |
|
964 |
virtio_cleanup(&n->vdev); |
965 |
qemu_del_vlan_client(&n->nic->nc); |
966 |
} |