root / hw / virtio-net.c @ 9f506893
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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 "iov.h" |
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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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|
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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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QEMUBH *tx_bh; |
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uint32_t tx_timeout; |
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int32_t tx_burst; |
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int tx_waiting;
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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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bool vm_running;
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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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DeviceState *qdev; |
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} VirtIONet; |
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|
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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_status(struct VirtIODevice *vdev, uint8_t status) |
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{
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VirtIONet *n = to_virtio_net(vdev); |
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if (!n->nic->nc.peer) {
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return;
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} |
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if (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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if (!!n->vhost_started == ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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(n->status & VIRTIO_NET_S_LINK_UP) && |
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n->vm_running)) {
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return;
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} |
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if (!n->vhost_started) {
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int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
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if (r < 0) { |
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fprintf(stderr, "unable to start vhost net: %d: "
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"falling back on userspace virtio\n", -r);
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} else {
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n->vhost_started = 1;
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} |
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} else {
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vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); |
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n->vhost_started = 0;
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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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virtio_net_set_status(&n->vdev, n->vdev.status); |
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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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/* 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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vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features); |
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} |
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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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|
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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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|
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return VIRTIO_NET_OK;
|
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} |
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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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|
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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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|
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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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|
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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; |
| 324 |
} else {
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n->mac_table.uni_overflow = 1;
|
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} |
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|
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n->mac_table.first_multi = n->mac_table.in_use; |
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|
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mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
|
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|
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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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|
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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; |
| 342 |
} else {
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n->mac_table.multi_overflow = 1;
|
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} |
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} |
| 346 |
|
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return VIRTIO_NET_OK;
|
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} |
| 349 |
|
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static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
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VirtQueueElement *elem) |
| 352 |
{
|
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uint16_t vid; |
| 354 |
|
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
| 356 |
fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
|
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return VIRTIO_NET_ERR;
|
| 358 |
} |
| 359 |
|
| 360 |
vid = lduw_le_p(elem->out_sg[1].iov_base);
|
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|
| 362 |
if (vid >= MAX_VLAN)
|
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return VIRTIO_NET_ERR;
|
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|
| 365 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
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n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
| 367 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
| 368 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
| 369 |
else
|
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return VIRTIO_NET_ERR;
|
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|
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return VIRTIO_NET_OK;
|
| 373 |
} |
| 374 |
|
| 375 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
| 376 |
{
|
| 377 |
VirtIONet *n = to_virtio_net(vdev); |
| 378 |
struct virtio_net_ctrl_hdr ctrl;
|
| 379 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
| 380 |
VirtQueueElement elem; |
| 381 |
|
| 382 |
while (virtqueue_pop(vq, &elem)) {
|
| 383 |
if ((elem.in_num < 1) || (elem.out_num < 1)) { |
| 384 |
fprintf(stderr, "virtio-net ctrl missing headers\n");
|
| 385 |
exit(1);
|
| 386 |
} |
| 387 |
|
| 388 |
if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
| 389 |
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
| 390 |
fprintf(stderr, "virtio-net ctrl header not in correct element\n");
|
| 391 |
exit(1);
|
| 392 |
} |
| 393 |
|
| 394 |
ctrl.class = ldub_p(elem.out_sg[0].iov_base);
|
| 395 |
ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
| 396 |
|
| 397 |
if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
|
| 398 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); |
| 399 |
else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
| 400 |
status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
| 401 |
else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
| 402 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
| 403 |
|
| 404 |
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
|
| 405 |
|
| 406 |
virtqueue_push(vq, &elem, sizeof(status));
|
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virtio_notify(vdev, vq); |
| 408 |
} |
| 409 |
} |
| 410 |
|
| 411 |
/* RX */
|
| 412 |
|
| 413 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
| 414 |
{
|
| 415 |
VirtIONet *n = to_virtio_net(vdev); |
| 416 |
|
| 417 |
qemu_flush_queued_packets(&n->nic->nc); |
| 418 |
|
| 419 |
/* We now have RX buffers, signal to the IO thread to break out of the
|
| 420 |
* select to re-poll the tap file descriptor */
|
| 421 |
qemu_notify_event(); |
| 422 |
} |
| 423 |
|
| 424 |
static int virtio_net_can_receive(VLANClientState *nc) |
| 425 |
{
|
| 426 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
| 427 |
|
| 428 |
if (!virtio_queue_ready(n->rx_vq) ||
|
| 429 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
| 430 |
return 0; |
| 431 |
|
| 432 |
return 1; |
| 433 |
} |
| 434 |
|
| 435 |
static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
| 436 |
{
|
| 437 |
if (virtio_queue_empty(n->rx_vq) ||
|
| 438 |
(n->mergeable_rx_bufs && |
| 439 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
|
| 440 |
virtio_queue_set_notification(n->rx_vq, 1);
|
| 441 |
|
| 442 |
/* To avoid a race condition where the guest has made some buffers
|
| 443 |
* available after the above check but before notification was
|
| 444 |
* enabled, check for available buffers again.
|
| 445 |
*/
|
| 446 |
if (virtio_queue_empty(n->rx_vq) ||
|
| 447 |
(n->mergeable_rx_bufs && |
| 448 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
|
| 449 |
return 0; |
| 450 |
} |
| 451 |
|
| 452 |
virtio_queue_set_notification(n->rx_vq, 0);
|
| 453 |
return 1; |
| 454 |
} |
| 455 |
|
| 456 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
| 457 |
* it never finds out that the packets don't have valid checksums. This
|
| 458 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
| 459 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
| 460 |
* dhclient yet.
|
| 461 |
*
|
| 462 |
* To avoid breaking existing guests, we catch udp packets and add
|
| 463 |
* checksums. This is terrible but it's better than hacking the guest
|
| 464 |
* kernels.
|
| 465 |
*
|
| 466 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
| 467 |
* we should provide a mechanism to disable it to avoid polluting the host
|
| 468 |
* cache.
|
| 469 |
*/
|
| 470 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
| 471 |
const uint8_t *buf, size_t size)
|
| 472 |
{
|
| 473 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
| 474 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
| 475 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
| 476 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
| 477 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
| 478 |
/* FIXME this cast is evil */
|
| 479 |
net_checksum_calculate((uint8_t *)buf, size); |
| 480 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 481 |
} |
| 482 |
} |
| 483 |
|
| 484 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
| 485 |
const void *buf, size_t size, size_t hdr_len) |
| 486 |
{
|
| 487 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
| 488 |
int offset = 0; |
| 489 |
|
| 490 |
hdr->flags = 0;
|
| 491 |
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 492 |
|
| 493 |
if (n->has_vnet_hdr) {
|
| 494 |
memcpy(hdr, buf, sizeof(*hdr));
|
| 495 |
offset = sizeof(*hdr);
|
| 496 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
| 497 |
} |
| 498 |
|
| 499 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
| 500 |
* but we may be passing along a larger header to the guest.
|
| 501 |
*/
|
| 502 |
iov[0].iov_base += hdr_len;
|
| 503 |
iov[0].iov_len -= hdr_len;
|
| 504 |
|
| 505 |
return offset;
|
| 506 |
} |
| 507 |
|
| 508 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
| 509 |
{
|
| 510 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| 511 |
static const uint8_t vlan[] = {0x81, 0x00}; |
| 512 |
uint8_t *ptr = (uint8_t *)buf; |
| 513 |
int i;
|
| 514 |
|
| 515 |
if (n->promisc)
|
| 516 |
return 1; |
| 517 |
|
| 518 |
if (n->has_vnet_hdr) {
|
| 519 |
ptr += sizeof(struct virtio_net_hdr); |
| 520 |
} |
| 521 |
|
| 522 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
| 523 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
| 524 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
| 525 |
return 0; |
| 526 |
} |
| 527 |
|
| 528 |
if (ptr[0] & 1) { // multicast |
| 529 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
| 530 |
return !n->nobcast;
|
| 531 |
} else if (n->nomulti) { |
| 532 |
return 0; |
| 533 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
| 534 |
return 1; |
| 535 |
} |
| 536 |
|
| 537 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
| 538 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 539 |
return 1; |
| 540 |
} |
| 541 |
} |
| 542 |
} else { // unicast |
| 543 |
if (n->nouni) {
|
| 544 |
return 0; |
| 545 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
| 546 |
return 1; |
| 547 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
| 548 |
return 1; |
| 549 |
} |
| 550 |
|
| 551 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
| 552 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 553 |
return 1; |
| 554 |
} |
| 555 |
} |
| 556 |
} |
| 557 |
|
| 558 |
return 0; |
| 559 |
} |
| 560 |
|
| 561 |
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
| 562 |
{
|
| 563 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
| 564 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
| 565 |
size_t guest_hdr_len, offset, i, host_hdr_len; |
| 566 |
|
| 567 |
if (!virtio_net_can_receive(&n->nic->nc))
|
| 568 |
return -1; |
| 569 |
|
| 570 |
/* hdr_len refers to the header we supply to the guest */
|
| 571 |
guest_hdr_len = n->mergeable_rx_bufs ? |
| 572 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
| 573 |
|
| 574 |
|
| 575 |
host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; |
| 576 |
if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len))
|
| 577 |
return 0; |
| 578 |
|
| 579 |
if (!receive_filter(n, buf, size))
|
| 580 |
return size;
|
| 581 |
|
| 582 |
offset = i = 0;
|
| 583 |
|
| 584 |
while (offset < size) {
|
| 585 |
VirtQueueElement elem; |
| 586 |
int len, total;
|
| 587 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
| 588 |
|
| 589 |
total = 0;
|
| 590 |
|
| 591 |
if (virtqueue_pop(n->rx_vq, &elem) == 0) { |
| 592 |
if (i == 0) |
| 593 |
return -1; |
| 594 |
fprintf(stderr, "virtio-net unexpected empty queue: "
|
| 595 |
"i %zd mergeable %d offset %zd, size %zd, "
|
| 596 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x\n",
|
| 597 |
i, n->mergeable_rx_bufs, offset, size, |
| 598 |
guest_hdr_len, host_hdr_len, n->vdev.guest_features); |
| 599 |
exit(1);
|
| 600 |
} |
| 601 |
|
| 602 |
if (elem.in_num < 1) { |
| 603 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
| 604 |
exit(1);
|
| 605 |
} |
| 606 |
|
| 607 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) { |
| 608 |
fprintf(stderr, "virtio-net header not in first element\n");
|
| 609 |
exit(1);
|
| 610 |
} |
| 611 |
|
| 612 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
| 613 |
|
| 614 |
if (i == 0) { |
| 615 |
if (n->mergeable_rx_bufs)
|
| 616 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
| 617 |
|
| 618 |
offset += receive_header(n, sg, elem.in_num, |
| 619 |
buf + offset, size - offset, guest_hdr_len); |
| 620 |
total += guest_hdr_len; |
| 621 |
} |
| 622 |
|
| 623 |
/* copy in packet. ugh */
|
| 624 |
len = iov_from_buf(sg, elem.in_num, |
| 625 |
buf + offset, size - offset); |
| 626 |
total += len; |
| 627 |
offset += len; |
| 628 |
/* If buffers can't be merged, at this point we
|
| 629 |
* must have consumed the complete packet.
|
| 630 |
* Otherwise, drop it. */
|
| 631 |
if (!n->mergeable_rx_bufs && offset < size) {
|
| 632 |
#if 0
|
| 633 |
fprintf(stderr, "virtio-net truncated non-mergeable packet: "
|
| 634 |
|
| 635 |
"i %zd mergeable %d offset %zd, size %zd, "
|
| 636 |
"guest hdr len %zd, host hdr len %zd\n",
|
| 637 |
i, n->mergeable_rx_bufs,
|
| 638 |
offset, size, guest_hdr_len, host_hdr_len);
|
| 639 |
#endif
|
| 640 |
return size;
|
| 641 |
} |
| 642 |
|
| 643 |
/* signal other side */
|
| 644 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
| 645 |
} |
| 646 |
|
| 647 |
if (mhdr)
|
| 648 |
mhdr->num_buffers = i; |
| 649 |
|
| 650 |
virtqueue_flush(n->rx_vq, i); |
| 651 |
virtio_notify(&n->vdev, n->rx_vq); |
| 652 |
|
| 653 |
return size;
|
| 654 |
} |
| 655 |
|
| 656 |
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
|
| 657 |
|
| 658 |
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len) |
| 659 |
{
|
| 660 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
| 661 |
|
| 662 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
| 663 |
virtio_notify(&n->vdev, n->tx_vq); |
| 664 |
|
| 665 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
| 666 |
|
| 667 |
virtio_queue_set_notification(n->tx_vq, 1);
|
| 668 |
virtio_net_flush_tx(n, n->tx_vq); |
| 669 |
} |
| 670 |
|
| 671 |
/* TX */
|
| 672 |
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
|
| 673 |
{
|
| 674 |
VirtQueueElement elem; |
| 675 |
int32_t num_packets = 0;
|
| 676 |
|
| 677 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 678 |
return num_packets;
|
| 679 |
} |
| 680 |
|
| 681 |
if (n->async_tx.elem.out_num) {
|
| 682 |
virtio_queue_set_notification(n->tx_vq, 0);
|
| 683 |
return num_packets;
|
| 684 |
} |
| 685 |
|
| 686 |
while (virtqueue_pop(vq, &elem)) {
|
| 687 |
ssize_t ret, len = 0;
|
| 688 |
unsigned int out_num = elem.out_num; |
| 689 |
struct iovec *out_sg = &elem.out_sg[0]; |
| 690 |
unsigned hdr_len;
|
| 691 |
|
| 692 |
/* hdr_len refers to the header received from the guest */
|
| 693 |
hdr_len = n->mergeable_rx_bufs ? |
| 694 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
| 695 |
sizeof(struct virtio_net_hdr); |
| 696 |
|
| 697 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
| 698 |
fprintf(stderr, "virtio-net header not in first element\n");
|
| 699 |
exit(1);
|
| 700 |
} |
| 701 |
|
| 702 |
/* ignore the header if GSO is not supported */
|
| 703 |
if (!n->has_vnet_hdr) {
|
| 704 |
out_num--; |
| 705 |
out_sg++; |
| 706 |
len += hdr_len; |
| 707 |
} else if (n->mergeable_rx_bufs) { |
| 708 |
/* tapfd expects a struct virtio_net_hdr */
|
| 709 |
hdr_len -= sizeof(struct virtio_net_hdr); |
| 710 |
out_sg->iov_len -= hdr_len; |
| 711 |
len += hdr_len; |
| 712 |
} |
| 713 |
|
| 714 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
| 715 |
virtio_net_tx_complete); |
| 716 |
if (ret == 0) { |
| 717 |
virtio_queue_set_notification(n->tx_vq, 0);
|
| 718 |
n->async_tx.elem = elem; |
| 719 |
n->async_tx.len = len; |
| 720 |
return -EBUSY;
|
| 721 |
} |
| 722 |
|
| 723 |
len += ret; |
| 724 |
|
| 725 |
virtqueue_push(vq, &elem, len); |
| 726 |
virtio_notify(&n->vdev, vq); |
| 727 |
|
| 728 |
if (++num_packets >= n->tx_burst) {
|
| 729 |
break;
|
| 730 |
} |
| 731 |
} |
| 732 |
return num_packets;
|
| 733 |
} |
| 734 |
|
| 735 |
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) |
| 736 |
{
|
| 737 |
VirtIONet *n = to_virtio_net(vdev); |
| 738 |
|
| 739 |
if (n->tx_waiting) {
|
| 740 |
virtio_queue_set_notification(vq, 1);
|
| 741 |
qemu_del_timer(n->tx_timer); |
| 742 |
n->tx_waiting = 0;
|
| 743 |
virtio_net_flush_tx(n, vq); |
| 744 |
} else {
|
| 745 |
qemu_mod_timer(n->tx_timer, |
| 746 |
qemu_get_clock(vm_clock) + n->tx_timeout); |
| 747 |
n->tx_waiting = 1;
|
| 748 |
virtio_queue_set_notification(vq, 0);
|
| 749 |
} |
| 750 |
} |
| 751 |
|
| 752 |
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) |
| 753 |
{
|
| 754 |
VirtIONet *n = to_virtio_net(vdev); |
| 755 |
|
| 756 |
if (unlikely(n->tx_waiting)) {
|
| 757 |
return;
|
| 758 |
} |
| 759 |
virtio_queue_set_notification(vq, 0);
|
| 760 |
qemu_bh_schedule(n->tx_bh); |
| 761 |
n->tx_waiting = 1;
|
| 762 |
} |
| 763 |
|
| 764 |
static void virtio_net_tx_timer(void *opaque) |
| 765 |
{
|
| 766 |
VirtIONet *n = opaque; |
| 767 |
|
| 768 |
n->tx_waiting = 0;
|
| 769 |
|
| 770 |
/* Just in case the driver is not ready on more */
|
| 771 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
| 772 |
return;
|
| 773 |
|
| 774 |
virtio_queue_set_notification(n->tx_vq, 1);
|
| 775 |
virtio_net_flush_tx(n, n->tx_vq); |
| 776 |
} |
| 777 |
|
| 778 |
static void virtio_net_tx_bh(void *opaque) |
| 779 |
{
|
| 780 |
VirtIONet *n = opaque; |
| 781 |
int32_t ret; |
| 782 |
|
| 783 |
n->tx_waiting = 0;
|
| 784 |
|
| 785 |
/* Just in case the driver is not ready on more */
|
| 786 |
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
| 787 |
return;
|
| 788 |
|
| 789 |
ret = virtio_net_flush_tx(n, n->tx_vq); |
| 790 |
if (ret == -EBUSY) {
|
| 791 |
return; /* Notification re-enable handled by tx_complete */ |
| 792 |
} |
| 793 |
|
| 794 |
/* If we flush a full burst of packets, assume there are
|
| 795 |
* more coming and immediately reschedule */
|
| 796 |
if (ret >= n->tx_burst) {
|
| 797 |
qemu_bh_schedule(n->tx_bh); |
| 798 |
n->tx_waiting = 1;
|
| 799 |
return;
|
| 800 |
} |
| 801 |
|
| 802 |
/* If less than a full burst, re-enable notification and flush
|
| 803 |
* anything that may have come in while we weren't looking. If
|
| 804 |
* we find something, assume the guest is still active and reschedule */
|
| 805 |
virtio_queue_set_notification(n->tx_vq, 1);
|
| 806 |
if (virtio_net_flush_tx(n, n->tx_vq) > 0) { |
| 807 |
virtio_queue_set_notification(n->tx_vq, 0);
|
| 808 |
qemu_bh_schedule(n->tx_bh); |
| 809 |
n->tx_waiting = 1;
|
| 810 |
} |
| 811 |
} |
| 812 |
|
| 813 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
| 814 |
{
|
| 815 |
VirtIONet *n = opaque; |
| 816 |
|
| 817 |
/* At this point, backend must be stopped, otherwise
|
| 818 |
* it might keep writing to memory. */
|
| 819 |
assert(!n->vhost_started); |
| 820 |
virtio_save(&n->vdev, f); |
| 821 |
|
| 822 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
| 823 |
qemu_put_be32(f, n->tx_waiting); |
| 824 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
| 825 |
qemu_put_be16(f, n->status); |
| 826 |
qemu_put_byte(f, n->promisc); |
| 827 |
qemu_put_byte(f, n->allmulti); |
| 828 |
qemu_put_be32(f, n->mac_table.in_use); |
| 829 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
| 830 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 831 |
qemu_put_be32(f, n->has_vnet_hdr); |
| 832 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
| 833 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
| 834 |
qemu_put_byte(f, n->alluni); |
| 835 |
qemu_put_byte(f, n->nomulti); |
| 836 |
qemu_put_byte(f, n->nouni); |
| 837 |
qemu_put_byte(f, n->nobcast); |
| 838 |
qemu_put_byte(f, n->has_ufo); |
| 839 |
} |
| 840 |
|
| 841 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
| 842 |
{
|
| 843 |
VirtIONet *n = opaque; |
| 844 |
int i;
|
| 845 |
|
| 846 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
| 847 |
return -EINVAL;
|
| 848 |
|
| 849 |
virtio_load(&n->vdev, f); |
| 850 |
|
| 851 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
| 852 |
n->tx_waiting = qemu_get_be32(f); |
| 853 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
| 854 |
|
| 855 |
if (version_id >= 3) |
| 856 |
n->status = qemu_get_be16(f); |
| 857 |
|
| 858 |
if (version_id >= 4) { |
| 859 |
if (version_id < 8) { |
| 860 |
n->promisc = qemu_get_be32(f); |
| 861 |
n->allmulti = qemu_get_be32(f); |
| 862 |
} else {
|
| 863 |
n->promisc = qemu_get_byte(f); |
| 864 |
n->allmulti = qemu_get_byte(f); |
| 865 |
} |
| 866 |
} |
| 867 |
|
| 868 |
if (version_id >= 5) { |
| 869 |
n->mac_table.in_use = qemu_get_be32(f); |
| 870 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
| 871 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
| 872 |
qemu_get_buffer(f, n->mac_table.macs, |
| 873 |
n->mac_table.in_use * ETH_ALEN); |
| 874 |
} else if (n->mac_table.in_use) { |
| 875 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
| 876 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
| 877 |
n->mac_table.in_use = 0;
|
| 878 |
} |
| 879 |
} |
| 880 |
|
| 881 |
if (version_id >= 6) |
| 882 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 883 |
|
| 884 |
if (version_id >= 7) { |
| 885 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
| 886 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
| 887 |
return -1; |
| 888 |
} |
| 889 |
|
| 890 |
if (n->has_vnet_hdr) {
|
| 891 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
| 892 |
tap_set_offload(n->nic->nc.peer, |
| 893 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
| 894 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
| 895 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
| 896 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
| 897 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
| 898 |
} |
| 899 |
} |
| 900 |
|
| 901 |
if (version_id >= 9) { |
| 902 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
| 903 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
| 904 |
} |
| 905 |
|
| 906 |
if (version_id >= 10) { |
| 907 |
n->alluni = qemu_get_byte(f); |
| 908 |
n->nomulti = qemu_get_byte(f); |
| 909 |
n->nouni = qemu_get_byte(f); |
| 910 |
n->nobcast = qemu_get_byte(f); |
| 911 |
} |
| 912 |
|
| 913 |
if (version_id >= 11) { |
| 914 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
| 915 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
| 916 |
return -1; |
| 917 |
} |
| 918 |
} |
| 919 |
|
| 920 |
/* Find the first multicast entry in the saved MAC filter */
|
| 921 |
for (i = 0; i < n->mac_table.in_use; i++) { |
| 922 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
| 923 |
break;
|
| 924 |
} |
| 925 |
} |
| 926 |
n->mac_table.first_multi = i; |
| 927 |
|
| 928 |
if (n->tx_waiting) {
|
| 929 |
if (n->tx_timer) {
|
| 930 |
qemu_mod_timer(n->tx_timer, |
| 931 |
qemu_get_clock(vm_clock) + n->tx_timeout); |
| 932 |
} else {
|
| 933 |
qemu_bh_schedule(n->tx_bh); |
| 934 |
} |
| 935 |
} |
| 936 |
return 0; |
| 937 |
} |
| 938 |
|
| 939 |
static void virtio_net_cleanup(VLANClientState *nc) |
| 940 |
{
|
| 941 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
| 942 |
|
| 943 |
n->nic = NULL;
|
| 944 |
} |
| 945 |
|
| 946 |
static NetClientInfo net_virtio_info = {
|
| 947 |
.type = NET_CLIENT_TYPE_NIC, |
| 948 |
.size = sizeof(NICState),
|
| 949 |
.can_receive = virtio_net_can_receive, |
| 950 |
.receive = virtio_net_receive, |
| 951 |
.cleanup = virtio_net_cleanup, |
| 952 |
.link_status_changed = virtio_net_set_link_status, |
| 953 |
}; |
| 954 |
|
| 955 |
static void virtio_net_vmstate_change(void *opaque, int running, int reason) |
| 956 |
{
|
| 957 |
VirtIONet *n = opaque; |
| 958 |
n->vm_running = running; |
| 959 |
/* This is called when vm is started/stopped,
|
| 960 |
* it will start/stop vhost backend if appropriate
|
| 961 |
* e.g. after migration. */
|
| 962 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
| 963 |
} |
| 964 |
|
| 965 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, |
| 966 |
virtio_net_conf *net) |
| 967 |
{
|
| 968 |
VirtIONet *n; |
| 969 |
|
| 970 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
| 971 |
sizeof(struct virtio_net_config), |
| 972 |
sizeof(VirtIONet));
|
| 973 |
|
| 974 |
n->vdev.get_config = virtio_net_get_config; |
| 975 |
n->vdev.set_config = virtio_net_set_config; |
| 976 |
n->vdev.get_features = virtio_net_get_features; |
| 977 |
n->vdev.set_features = virtio_net_set_features; |
| 978 |
n->vdev.bad_features = virtio_net_bad_features; |
| 979 |
n->vdev.reset = virtio_net_reset; |
| 980 |
n->vdev.set_status = virtio_net_set_status; |
| 981 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
| 982 |
|
| 983 |
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { |
| 984 |
fprintf(stderr, "virtio-net: "
|
| 985 |
"Unknown option tx=%s, valid options: \"timer\" \"bh\"\n",
|
| 986 |
net->tx); |
| 987 |
fprintf(stderr, "Defaulting to \"bh\"\n");
|
| 988 |
} |
| 989 |
|
| 990 |
if (net->tx && !strcmp(net->tx, "timer")) { |
| 991 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
|
| 992 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
| 993 |
n->tx_timeout = net->txtimer; |
| 994 |
} else {
|
| 995 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
|
| 996 |
n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n); |
| 997 |
} |
| 998 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
| 999 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
| 1000 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
| 1001 |
n->status = VIRTIO_NET_S_LINK_UP; |
| 1002 |
|
| 1003 |
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n); |
| 1004 |
|
| 1005 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
| 1006 |
|
| 1007 |
n->tx_waiting = 0;
|
| 1008 |
n->tx_burst = net->txburst; |
| 1009 |
n->mergeable_rx_bufs = 0;
|
| 1010 |
n->promisc = 1; /* for compatibility */ |
| 1011 |
|
| 1012 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
| 1013 |
|
| 1014 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
| 1015 |
|
| 1016 |
n->qdev = dev; |
| 1017 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
| 1018 |
virtio_net_save, virtio_net_load, n); |
| 1019 |
n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n); |
| 1020 |
|
| 1021 |
return &n->vdev;
|
| 1022 |
} |
| 1023 |
|
| 1024 |
void virtio_net_exit(VirtIODevice *vdev)
|
| 1025 |
{
|
| 1026 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
| 1027 |
qemu_del_vm_change_state_handler(n->vmstate); |
| 1028 |
|
| 1029 |
/* This will stop vhost backend if appropriate. */
|
| 1030 |
virtio_net_set_status(vdev, 0);
|
| 1031 |
|
| 1032 |
qemu_purge_queued_packets(&n->nic->nc); |
| 1033 |
|
| 1034 |
unregister_savevm(n->qdev, "virtio-net", n);
|
| 1035 |
|
| 1036 |
qemu_free(n->mac_table.macs); |
| 1037 |
qemu_free(n->vlans); |
| 1038 |
|
| 1039 |
if (n->tx_timer) {
|
| 1040 |
qemu_del_timer(n->tx_timer); |
| 1041 |
qemu_free_timer(n->tx_timer); |
| 1042 |
} else {
|
| 1043 |
qemu_bh_delete(n->tx_bh); |
| 1044 |
} |
| 1045 |
|
| 1046 |
virtio_cleanup(&n->vdev); |
| 1047 |
qemu_del_vlan_client(&n->nic->nc); |
| 1048 |
} |