root / hw / virtio-net.c @ 1e89ad5b
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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 "qemu/iov.h" |
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#include "virtio.h" |
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#include "net/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-report.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 VirtIONetQueue { |
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VirtQueue *rx_vq; |
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VirtQueue *tx_vq; |
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QEMUTimer *tx_timer; |
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QEMUBH *tx_bh; |
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int tx_waiting;
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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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struct VirtIONet *n;
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} VirtIONetQueue; |
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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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VirtIONetQueue vqs[MAX_QUEUE_NUM]; |
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VirtQueue *ctrl_vq; |
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NICState *nic; |
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uint32_t tx_timeout; |
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int32_t tx_burst; |
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uint32_t has_vnet_hdr; |
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size_t host_hdr_len; |
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size_t guest_hdr_len; |
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uint8_t has_ufo; |
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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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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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int multiqueue;
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uint16_t max_queues; |
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uint16_t curr_queues; |
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} VirtIONet; |
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static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
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{ |
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VirtIONet *n = qemu_get_nic_opaque(nc); |
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return &n->vqs[nc->queue_index];
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} |
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static int vq2q(int queue_index) |
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{ |
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return queue_index / 2; |
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} |
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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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stw_p(&netcfg.status, n->status); |
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stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); |
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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 (!(n->vdev.guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && |
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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(qemu_get_queue(n->nic), n->mac); |
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} |
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} |
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static bool virtio_net_started(VirtIONet *n, uint8_t status) |
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{ |
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return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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(n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running; |
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} |
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static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) |
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{ |
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NetClientState *nc = qemu_get_queue(n->nic); |
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int queues = n->multiqueue ? n->max_queues : 1; |
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if (!nc->peer) {
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return;
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} |
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if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return;
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} |
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if (!tap_get_vhost_net(nc->peer)) {
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return;
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} |
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if (!!n->vhost_started == virtio_net_started(n, status) &&
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!nc->peer->link_down) { |
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return;
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} |
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if (!n->vhost_started) {
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int r;
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if (!vhost_net_query(tap_get_vhost_net(nc->peer), &n->vdev)) {
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return;
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} |
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n->vhost_started = 1;
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r = vhost_net_start(&n->vdev, n->nic->ncs, queues); |
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if (r < 0) { |
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error_report("unable to start vhost net: %d: "
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"falling back on userspace virtio", -r);
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n->vhost_started = 0;
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} |
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} else {
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vhost_net_stop(&n->vdev, n->nic->ncs, queues); |
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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_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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VirtIONetQueue *q; |
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int i;
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uint8_t queue_status; |
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virtio_net_vhost_status(n, status); |
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for (i = 0; i < n->max_queues; i++) { |
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q = &n->vqs[i]; |
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if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { |
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queue_status = 0;
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} else {
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queue_status = status; |
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} |
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if (!q->tx_waiting) {
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continue;
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} |
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if (virtio_net_started(n, queue_status) && !n->vhost_started) {
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if (q->tx_timer) {
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qemu_mod_timer(q->tx_timer, |
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qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
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} else {
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qemu_bh_schedule(q->tx_bh); |
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} |
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} else {
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if (q->tx_timer) {
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qemu_del_timer(q->tx_timer); |
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} else {
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qemu_bh_cancel(q->tx_bh); |
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} |
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} |
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} |
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} |
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static void virtio_net_set_link_status(NetClientState *nc) |
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{ |
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VirtIONet *n = qemu_get_nic_opaque(nc); |
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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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/* multiqueue is disabled by default */
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n->curr_queues = 1;
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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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memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); |
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memset(n->vlans, 0, MAX_VLAN >> 3); |
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} |
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static void peer_test_vnet_hdr(VirtIONet *n) |
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{ |
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NetClientState *nc = qemu_get_queue(n->nic); |
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if (!nc->peer) {
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return;
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} |
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if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return;
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} |
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n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer); |
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} |
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static int peer_has_vnet_hdr(VirtIONet *n) |
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{ |
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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(qemu_get_queue(n->nic)->peer); |
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return n->has_ufo;
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} |
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static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) |
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{ |
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int i;
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NetClientState *nc; |
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n->mergeable_rx_bufs = mergeable_rx_bufs; |
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n->guest_hdr_len = n->mergeable_rx_bufs ? |
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sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
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for (i = 0; i < n->max_queues; i++) { |
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nc = qemu_get_subqueue(n->nic, i); |
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if (peer_has_vnet_hdr(n) &&
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tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) { |
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tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); |
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n->host_hdr_len = n->guest_hdr_len; |
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} |
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} |
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} |
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static int peer_attach(VirtIONet *n, int index) |
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{ |
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NetClientState *nc = qemu_get_subqueue(n->nic, index); |
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if (!nc->peer) {
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return 0; |
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} |
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if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return 0; |
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} |
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return tap_enable(nc->peer);
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} |
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static int peer_detach(VirtIONet *n, int index) |
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{ |
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NetClientState *nc = qemu_get_subqueue(n->nic, index); |
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|
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if (!nc->peer) {
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return 0; |
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} |
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if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return 0; |
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} |
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return tap_disable(nc->peer);
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} |
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|
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static void virtio_net_set_queues(VirtIONet *n) |
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{ |
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int i;
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for (i = 0; i < n->max_queues; i++) { |
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if (i < n->curr_queues) {
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assert(!peer_attach(n, i)); |
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} else {
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assert(!peer_detach(n, i)); |
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} |
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} |
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} |
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static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl); |
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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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NetClientState *nc = qemu_get_queue(n->nic); |
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features |= (1 << VIRTIO_NET_F_MAC);
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if (!peer_has_vnet_hdr(n)) {
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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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} |
360 |
|
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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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} |
365 |
|
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if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return features;
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} |
369 |
if (!tap_get_vhost_net(nc->peer)) {
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370 |
return features;
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} |
372 |
return vhost_net_get_features(tap_get_vhost_net(nc->peer), features);
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} |
374 |
|
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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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386 |
|
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return features;
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} |
389 |
|
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static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
391 |
{ |
392 |
VirtIONet *n = to_virtio_net(vdev); |
393 |
int i;
|
394 |
|
395 |
virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)),
|
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!!(features & (1 << VIRTIO_NET_F_CTRL_VQ)));
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397 |
|
398 |
virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
|
399 |
|
400 |
if (n->has_vnet_hdr) {
|
401 |
tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
|
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(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
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403 |
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
404 |
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
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(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
406 |
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
407 |
} |
408 |
|
409 |
for (i = 0; i < n->max_queues; i++) { |
410 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
411 |
|
412 |
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
413 |
continue;
|
414 |
} |
415 |
if (!tap_get_vhost_net(nc->peer)) {
|
416 |
continue;
|
417 |
} |
418 |
vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); |
419 |
} |
420 |
} |
421 |
|
422 |
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
423 |
struct iovec *iov, unsigned int iov_cnt) |
424 |
{ |
425 |
uint8_t on; |
426 |
size_t s; |
427 |
|
428 |
s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); |
429 |
if (s != sizeof(on)) { |
430 |
return VIRTIO_NET_ERR;
|
431 |
} |
432 |
|
433 |
if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
|
434 |
n->promisc = on; |
435 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { |
436 |
n->allmulti = on; |
437 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { |
438 |
n->alluni = on; |
439 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { |
440 |
n->nomulti = on; |
441 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { |
442 |
n->nouni = on; |
443 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { |
444 |
n->nobcast = on; |
445 |
} else {
|
446 |
return VIRTIO_NET_ERR;
|
447 |
} |
448 |
|
449 |
return VIRTIO_NET_OK;
|
450 |
} |
451 |
|
452 |
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
453 |
struct iovec *iov, unsigned int iov_cnt) |
454 |
{ |
455 |
struct virtio_net_ctrl_mac mac_data;
|
456 |
size_t s; |
457 |
|
458 |
if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
|
459 |
if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { |
460 |
return VIRTIO_NET_ERR;
|
461 |
} |
462 |
s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); |
463 |
assert(s == sizeof(n->mac));
|
464 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); |
465 |
return VIRTIO_NET_OK;
|
466 |
} |
467 |
|
468 |
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
|
469 |
return VIRTIO_NET_ERR;
|
470 |
} |
471 |
|
472 |
n->mac_table.in_use = 0;
|
473 |
n->mac_table.first_multi = 0;
|
474 |
n->mac_table.uni_overflow = 0;
|
475 |
n->mac_table.multi_overflow = 0;
|
476 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
477 |
|
478 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
479 |
sizeof(mac_data.entries));
|
480 |
mac_data.entries = ldl_p(&mac_data.entries); |
481 |
if (s != sizeof(mac_data.entries)) { |
482 |
return VIRTIO_NET_ERR;
|
483 |
} |
484 |
iov_discard_front(&iov, &iov_cnt, s); |
485 |
|
486 |
if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
|
487 |
return VIRTIO_NET_ERR;
|
488 |
} |
489 |
|
490 |
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
491 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
492 |
mac_data.entries * ETH_ALEN); |
493 |
if (s != mac_data.entries * ETH_ALEN) {
|
494 |
return VIRTIO_NET_ERR;
|
495 |
} |
496 |
n->mac_table.in_use += mac_data.entries; |
497 |
} else {
|
498 |
n->mac_table.uni_overflow = 1;
|
499 |
} |
500 |
|
501 |
iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); |
502 |
|
503 |
n->mac_table.first_multi = n->mac_table.in_use; |
504 |
|
505 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
506 |
sizeof(mac_data.entries));
|
507 |
mac_data.entries = ldl_p(&mac_data.entries); |
508 |
if (s != sizeof(mac_data.entries)) { |
509 |
return VIRTIO_NET_ERR;
|
510 |
} |
511 |
|
512 |
iov_discard_front(&iov, &iov_cnt, s); |
513 |
|
514 |
if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
|
515 |
return VIRTIO_NET_ERR;
|
516 |
} |
517 |
|
518 |
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
|
519 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
520 |
mac_data.entries * ETH_ALEN); |
521 |
if (s != mac_data.entries * ETH_ALEN) {
|
522 |
return VIRTIO_NET_ERR;
|
523 |
} |
524 |
n->mac_table.in_use += mac_data.entries; |
525 |
} else {
|
526 |
n->mac_table.multi_overflow = 1;
|
527 |
} |
528 |
|
529 |
return VIRTIO_NET_OK;
|
530 |
} |
531 |
|
532 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
533 |
struct iovec *iov, unsigned int iov_cnt) |
534 |
{ |
535 |
uint16_t vid; |
536 |
size_t s; |
537 |
|
538 |
s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); |
539 |
vid = lduw_p(&vid); |
540 |
if (s != sizeof(vid)) { |
541 |
return VIRTIO_NET_ERR;
|
542 |
} |
543 |
|
544 |
if (vid >= MAX_VLAN)
|
545 |
return VIRTIO_NET_ERR;
|
546 |
|
547 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
548 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
549 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
550 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
551 |
else
|
552 |
return VIRTIO_NET_ERR;
|
553 |
|
554 |
return VIRTIO_NET_OK;
|
555 |
} |
556 |
|
557 |
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, |
558 |
VirtQueueElement *elem) |
559 |
{ |
560 |
struct virtio_net_ctrl_mq s;
|
561 |
|
562 |
if (elem->out_num != 2 || |
563 |
elem->out_sg[1].iov_len != sizeof(struct virtio_net_ctrl_mq)) { |
564 |
error_report("virtio-net ctrl invalid steering command");
|
565 |
return VIRTIO_NET_ERR;
|
566 |
} |
567 |
|
568 |
if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
|
569 |
return VIRTIO_NET_ERR;
|
570 |
} |
571 |
|
572 |
memcpy(&s, elem->out_sg[1].iov_base, sizeof(struct virtio_net_ctrl_mq)); |
573 |
|
574 |
if (s.virtqueue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
|
575 |
s.virtqueue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || |
576 |
s.virtqueue_pairs > n->max_queues || |
577 |
!n->multiqueue) { |
578 |
return VIRTIO_NET_ERR;
|
579 |
} |
580 |
|
581 |
n->curr_queues = s.virtqueue_pairs; |
582 |
/* stop the backend before changing the number of queues to avoid handling a
|
583 |
* disabled queue */
|
584 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
585 |
virtio_net_set_queues(n); |
586 |
|
587 |
return VIRTIO_NET_OK;
|
588 |
} |
589 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
590 |
{ |
591 |
VirtIONet *n = to_virtio_net(vdev); |
592 |
struct virtio_net_ctrl_hdr ctrl;
|
593 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
594 |
VirtQueueElement elem; |
595 |
size_t s; |
596 |
struct iovec *iov;
|
597 |
unsigned int iov_cnt; |
598 |
|
599 |
while (virtqueue_pop(vq, &elem)) {
|
600 |
if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || |
601 |
iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
|
602 |
error_report("virtio-net ctrl missing headers");
|
603 |
exit(1);
|
604 |
} |
605 |
|
606 |
iov = elem.out_sg; |
607 |
iov_cnt = elem.out_num; |
608 |
s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); |
609 |
iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
|
610 |
if (s != sizeof(ctrl)) { |
611 |
status = VIRTIO_NET_ERR; |
612 |
} else if (ctrl.class == VIRTIO_NET_CTRL_RX) { |
613 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); |
614 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { |
615 |
status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); |
616 |
} else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { |
617 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); |
618 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { |
619 |
status = virtio_net_handle_mq(n, ctrl.cmd, &elem); |
620 |
} |
621 |
|
622 |
s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); |
623 |
assert(s == sizeof(status));
|
624 |
|
625 |
virtqueue_push(vq, &elem, sizeof(status));
|
626 |
virtio_notify(vdev, vq); |
627 |
} |
628 |
} |
629 |
|
630 |
/* RX */
|
631 |
|
632 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
633 |
{ |
634 |
VirtIONet *n = to_virtio_net(vdev); |
635 |
int queue_index = vq2q(virtio_get_queue_index(vq));
|
636 |
|
637 |
qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); |
638 |
} |
639 |
|
640 |
static int virtio_net_can_receive(NetClientState *nc) |
641 |
{ |
642 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
643 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
644 |
|
645 |
if (!n->vdev.vm_running) {
|
646 |
return 0; |
647 |
} |
648 |
|
649 |
if (nc->queue_index >= n->curr_queues) {
|
650 |
return 0; |
651 |
} |
652 |
|
653 |
if (!virtio_queue_ready(q->rx_vq) ||
|
654 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
655 |
return 0; |
656 |
} |
657 |
|
658 |
return 1; |
659 |
} |
660 |
|
661 |
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) |
662 |
{ |
663 |
VirtIONet *n = q->n; |
664 |
if (virtio_queue_empty(q->rx_vq) ||
|
665 |
(n->mergeable_rx_bufs && |
666 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
667 |
virtio_queue_set_notification(q->rx_vq, 1);
|
668 |
|
669 |
/* To avoid a race condition where the guest has made some buffers
|
670 |
* available after the above check but before notification was
|
671 |
* enabled, check for available buffers again.
|
672 |
*/
|
673 |
if (virtio_queue_empty(q->rx_vq) ||
|
674 |
(n->mergeable_rx_bufs && |
675 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
676 |
return 0; |
677 |
} |
678 |
} |
679 |
|
680 |
virtio_queue_set_notification(q->rx_vq, 0);
|
681 |
return 1; |
682 |
} |
683 |
|
684 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
685 |
* it never finds out that the packets don't have valid checksums. This
|
686 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
687 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
688 |
* dhclient yet.
|
689 |
*
|
690 |
* To avoid breaking existing guests, we catch udp packets and add
|
691 |
* checksums. This is terrible but it's better than hacking the guest
|
692 |
* kernels.
|
693 |
*
|
694 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
695 |
* we should provide a mechanism to disable it to avoid polluting the host
|
696 |
* cache.
|
697 |
*/
|
698 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
699 |
uint8_t *buf, size_t size) |
700 |
{ |
701 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
702 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
703 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
704 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
705 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
706 |
net_checksum_calculate(buf, size); |
707 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
708 |
} |
709 |
} |
710 |
|
711 |
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, |
712 |
const void *buf, size_t size) |
713 |
{ |
714 |
if (n->has_vnet_hdr) {
|
715 |
/* FIXME this cast is evil */
|
716 |
void *wbuf = (void *)buf; |
717 |
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, |
718 |
size - n->host_hdr_len); |
719 |
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); |
720 |
} else {
|
721 |
struct virtio_net_hdr hdr = {
|
722 |
.flags = 0,
|
723 |
.gso_type = VIRTIO_NET_HDR_GSO_NONE |
724 |
}; |
725 |
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); |
726 |
} |
727 |
} |
728 |
|
729 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
730 |
{ |
731 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
732 |
static const uint8_t vlan[] = {0x81, 0x00}; |
733 |
uint8_t *ptr = (uint8_t *)buf; |
734 |
int i;
|
735 |
|
736 |
if (n->promisc)
|
737 |
return 1; |
738 |
|
739 |
ptr += n->host_hdr_len; |
740 |
|
741 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
742 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
743 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
744 |
return 0; |
745 |
} |
746 |
|
747 |
if (ptr[0] & 1) { // multicast |
748 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
749 |
return !n->nobcast;
|
750 |
} else if (n->nomulti) { |
751 |
return 0; |
752 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
753 |
return 1; |
754 |
} |
755 |
|
756 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
757 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
758 |
return 1; |
759 |
} |
760 |
} |
761 |
} else { // unicast |
762 |
if (n->nouni) {
|
763 |
return 0; |
764 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
765 |
return 1; |
766 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
767 |
return 1; |
768 |
} |
769 |
|
770 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
771 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
772 |
return 1; |
773 |
} |
774 |
} |
775 |
} |
776 |
|
777 |
return 0; |
778 |
} |
779 |
|
780 |
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
781 |
{ |
782 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
783 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
784 |
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
|
785 |
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
786 |
unsigned mhdr_cnt = 0; |
787 |
size_t offset, i, guest_offset; |
788 |
|
789 |
if (!virtio_net_can_receive(nc)) {
|
790 |
return -1; |
791 |
} |
792 |
|
793 |
/* hdr_len refers to the header we supply to the guest */
|
794 |
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
|
795 |
return 0; |
796 |
} |
797 |
|
798 |
if (!receive_filter(n, buf, size))
|
799 |
return size;
|
800 |
|
801 |
offset = i = 0;
|
802 |
|
803 |
while (offset < size) {
|
804 |
VirtQueueElement elem; |
805 |
int len, total;
|
806 |
const struct iovec *sg = elem.in_sg; |
807 |
|
808 |
total = 0;
|
809 |
|
810 |
if (virtqueue_pop(q->rx_vq, &elem) == 0) { |
811 |
if (i == 0) |
812 |
return -1; |
813 |
error_report("virtio-net unexpected empty queue: "
|
814 |
"i %zd mergeable %d offset %zd, size %zd, "
|
815 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
|
816 |
i, n->mergeable_rx_bufs, offset, size, |
817 |
n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); |
818 |
exit(1);
|
819 |
} |
820 |
|
821 |
if (elem.in_num < 1) { |
822 |
error_report("virtio-net receive queue contains no in buffers");
|
823 |
exit(1);
|
824 |
} |
825 |
|
826 |
if (i == 0) { |
827 |
assert(offset == 0);
|
828 |
if (n->mergeable_rx_bufs) {
|
829 |
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), |
830 |
sg, elem.in_num, |
831 |
offsetof(typeof(mhdr), num_buffers), |
832 |
sizeof(mhdr.num_buffers));
|
833 |
} |
834 |
|
835 |
receive_header(n, sg, elem.in_num, buf, size); |
836 |
offset = n->host_hdr_len; |
837 |
total += n->guest_hdr_len; |
838 |
guest_offset = n->guest_hdr_len; |
839 |
} else {
|
840 |
guest_offset = 0;
|
841 |
} |
842 |
|
843 |
/* copy in packet. ugh */
|
844 |
len = iov_from_buf(sg, elem.in_num, guest_offset, |
845 |
buf + offset, size - offset); |
846 |
total += len; |
847 |
offset += len; |
848 |
/* If buffers can't be merged, at this point we
|
849 |
* must have consumed the complete packet.
|
850 |
* Otherwise, drop it. */
|
851 |
if (!n->mergeable_rx_bufs && offset < size) {
|
852 |
#if 0
|
853 |
error_report("virtio-net truncated non-mergeable packet: "
|
854 |
"i %zd mergeable %d offset %zd, size %zd, "
|
855 |
"guest hdr len %zd, host hdr len %zd",
|
856 |
i, n->mergeable_rx_bufs,
|
857 |
offset, size, n->guest_hdr_len, n->host_hdr_len);
|
858 |
#endif
|
859 |
return size;
|
860 |
} |
861 |
|
862 |
/* signal other side */
|
863 |
virtqueue_fill(q->rx_vq, &elem, total, i++); |
864 |
} |
865 |
|
866 |
if (mhdr_cnt) {
|
867 |
stw_p(&mhdr.num_buffers, i); |
868 |
iov_from_buf(mhdr_sg, mhdr_cnt, |
869 |
0,
|
870 |
&mhdr.num_buffers, sizeof mhdr.num_buffers);
|
871 |
} |
872 |
|
873 |
virtqueue_flush(q->rx_vq, i); |
874 |
virtio_notify(&n->vdev, q->rx_vq); |
875 |
|
876 |
return size;
|
877 |
} |
878 |
|
879 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
|
880 |
|
881 |
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) |
882 |
{ |
883 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
884 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
885 |
|
886 |
virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
|
887 |
virtio_notify(&n->vdev, q->tx_vq); |
888 |
|
889 |
q->async_tx.elem.out_num = q->async_tx.len = 0;
|
890 |
|
891 |
virtio_queue_set_notification(q->tx_vq, 1);
|
892 |
virtio_net_flush_tx(q); |
893 |
} |
894 |
|
895 |
/* TX */
|
896 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
897 |
{ |
898 |
VirtIONet *n = q->n; |
899 |
VirtQueueElement elem; |
900 |
int32_t num_packets = 0;
|
901 |
int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
|
902 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
903 |
return num_packets;
|
904 |
} |
905 |
|
906 |
assert(n->vdev.vm_running); |
907 |
|
908 |
if (q->async_tx.elem.out_num) {
|
909 |
virtio_queue_set_notification(q->tx_vq, 0);
|
910 |
return num_packets;
|
911 |
} |
912 |
|
913 |
while (virtqueue_pop(q->tx_vq, &elem)) {
|
914 |
ssize_t ret, len; |
915 |
unsigned int out_num = elem.out_num; |
916 |
struct iovec *out_sg = &elem.out_sg[0]; |
917 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
918 |
|
919 |
if (out_num < 1) { |
920 |
error_report("virtio-net header not in first element");
|
921 |
exit(1);
|
922 |
} |
923 |
|
924 |
/*
|
925 |
* If host wants to see the guest header as is, we can
|
926 |
* pass it on unchanged. Otherwise, copy just the parts
|
927 |
* that host is interested in.
|
928 |
*/
|
929 |
assert(n->host_hdr_len <= n->guest_hdr_len); |
930 |
if (n->host_hdr_len != n->guest_hdr_len) {
|
931 |
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
|
932 |
out_sg, out_num, |
933 |
0, n->host_hdr_len);
|
934 |
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, |
935 |
out_sg, out_num, |
936 |
n->guest_hdr_len, -1);
|
937 |
out_num = sg_num; |
938 |
out_sg = sg; |
939 |
} |
940 |
|
941 |
len = n->guest_hdr_len; |
942 |
|
943 |
ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), |
944 |
out_sg, out_num, virtio_net_tx_complete); |
945 |
if (ret == 0) { |
946 |
virtio_queue_set_notification(q->tx_vq, 0);
|
947 |
q->async_tx.elem = elem; |
948 |
q->async_tx.len = len; |
949 |
return -EBUSY;
|
950 |
} |
951 |
|
952 |
len += ret; |
953 |
|
954 |
virtqueue_push(q->tx_vq, &elem, 0);
|
955 |
virtio_notify(&n->vdev, q->tx_vq); |
956 |
|
957 |
if (++num_packets >= n->tx_burst) {
|
958 |
break;
|
959 |
} |
960 |
} |
961 |
return num_packets;
|
962 |
} |
963 |
|
964 |
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) |
965 |
{ |
966 |
VirtIONet *n = to_virtio_net(vdev); |
967 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
968 |
|
969 |
/* This happens when device was stopped but VCPU wasn't. */
|
970 |
if (!n->vdev.vm_running) {
|
971 |
q->tx_waiting = 1;
|
972 |
return;
|
973 |
} |
974 |
|
975 |
if (q->tx_waiting) {
|
976 |
virtio_queue_set_notification(vq, 1);
|
977 |
qemu_del_timer(q->tx_timer); |
978 |
q->tx_waiting = 0;
|
979 |
virtio_net_flush_tx(q); |
980 |
} else {
|
981 |
qemu_mod_timer(q->tx_timer, |
982 |
qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
983 |
q->tx_waiting = 1;
|
984 |
virtio_queue_set_notification(vq, 0);
|
985 |
} |
986 |
} |
987 |
|
988 |
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) |
989 |
{ |
990 |
VirtIONet *n = to_virtio_net(vdev); |
991 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
992 |
|
993 |
if (unlikely(q->tx_waiting)) {
|
994 |
return;
|
995 |
} |
996 |
q->tx_waiting = 1;
|
997 |
/* This happens when device was stopped but VCPU wasn't. */
|
998 |
if (!n->vdev.vm_running) {
|
999 |
return;
|
1000 |
} |
1001 |
virtio_queue_set_notification(vq, 0);
|
1002 |
qemu_bh_schedule(q->tx_bh); |
1003 |
} |
1004 |
|
1005 |
static void virtio_net_tx_timer(void *opaque) |
1006 |
{ |
1007 |
VirtIONetQueue *q = opaque; |
1008 |
VirtIONet *n = q->n; |
1009 |
assert(n->vdev.vm_running); |
1010 |
|
1011 |
q->tx_waiting = 0;
|
1012 |
|
1013 |
/* Just in case the driver is not ready on more */
|
1014 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
1015 |
return;
|
1016 |
|
1017 |
virtio_queue_set_notification(q->tx_vq, 1);
|
1018 |
virtio_net_flush_tx(q); |
1019 |
} |
1020 |
|
1021 |
static void virtio_net_tx_bh(void *opaque) |
1022 |
{ |
1023 |
VirtIONetQueue *q = opaque; |
1024 |
VirtIONet *n = q->n; |
1025 |
int32_t ret; |
1026 |
|
1027 |
assert(n->vdev.vm_running); |
1028 |
|
1029 |
q->tx_waiting = 0;
|
1030 |
|
1031 |
/* Just in case the driver is not ready on more */
|
1032 |
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
1033 |
return;
|
1034 |
|
1035 |
ret = virtio_net_flush_tx(q); |
1036 |
if (ret == -EBUSY) {
|
1037 |
return; /* Notification re-enable handled by tx_complete */ |
1038 |
} |
1039 |
|
1040 |
/* If we flush a full burst of packets, assume there are
|
1041 |
* more coming and immediately reschedule */
|
1042 |
if (ret >= n->tx_burst) {
|
1043 |
qemu_bh_schedule(q->tx_bh); |
1044 |
q->tx_waiting = 1;
|
1045 |
return;
|
1046 |
} |
1047 |
|
1048 |
/* If less than a full burst, re-enable notification and flush
|
1049 |
* anything that may have come in while we weren't looking. If
|
1050 |
* we find something, assume the guest is still active and reschedule */
|
1051 |
virtio_queue_set_notification(q->tx_vq, 1);
|
1052 |
if (virtio_net_flush_tx(q) > 0) { |
1053 |
virtio_queue_set_notification(q->tx_vq, 0);
|
1054 |
qemu_bh_schedule(q->tx_bh); |
1055 |
q->tx_waiting = 1;
|
1056 |
} |
1057 |
} |
1058 |
|
1059 |
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) |
1060 |
{ |
1061 |
VirtIODevice *vdev = &n->vdev; |
1062 |
int i, max = multiqueue ? n->max_queues : 1; |
1063 |
|
1064 |
n->multiqueue = multiqueue; |
1065 |
|
1066 |
for (i = 2; i <= n->max_queues * 2 + 1; i++) { |
1067 |
virtio_del_queue(vdev, i); |
1068 |
} |
1069 |
|
1070 |
for (i = 1; i < max; i++) { |
1071 |
n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
|
1072 |
if (n->vqs[i].tx_timer) {
|
1073 |
n->vqs[i].tx_vq = |
1074 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
|
1075 |
n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, |
1076 |
virtio_net_tx_timer, |
1077 |
&n->vqs[i]); |
1078 |
} else {
|
1079 |
n->vqs[i].tx_vq = |
1080 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
|
1081 |
n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); |
1082 |
} |
1083 |
|
1084 |
n->vqs[i].tx_waiting = 0;
|
1085 |
n->vqs[i].n = n; |
1086 |
} |
1087 |
|
1088 |
if (ctrl) {
|
1089 |
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
|
1090 |
} |
1091 |
|
1092 |
virtio_net_set_queues(n); |
1093 |
} |
1094 |
|
1095 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
1096 |
{ |
1097 |
int i;
|
1098 |
VirtIONet *n = opaque; |
1099 |
|
1100 |
/* At this point, backend must be stopped, otherwise
|
1101 |
* it might keep writing to memory. */
|
1102 |
assert(!n->vhost_started); |
1103 |
virtio_save(&n->vdev, f); |
1104 |
|
1105 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
1106 |
qemu_put_be32(f, n->vqs[0].tx_waiting);
|
1107 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
1108 |
qemu_put_be16(f, n->status); |
1109 |
qemu_put_byte(f, n->promisc); |
1110 |
qemu_put_byte(f, n->allmulti); |
1111 |
qemu_put_be32(f, n->mac_table.in_use); |
1112 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
1113 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
1114 |
qemu_put_be32(f, n->has_vnet_hdr); |
1115 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
1116 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
1117 |
qemu_put_byte(f, n->alluni); |
1118 |
qemu_put_byte(f, n->nomulti); |
1119 |
qemu_put_byte(f, n->nouni); |
1120 |
qemu_put_byte(f, n->nobcast); |
1121 |
qemu_put_byte(f, n->has_ufo); |
1122 |
if (n->max_queues > 1) { |
1123 |
qemu_put_be16(f, n->max_queues); |
1124 |
qemu_put_be16(f, n->curr_queues); |
1125 |
for (i = 1; i < n->curr_queues; i++) { |
1126 |
qemu_put_be32(f, n->vqs[i].tx_waiting); |
1127 |
} |
1128 |
} |
1129 |
} |
1130 |
|
1131 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
1132 |
{ |
1133 |
VirtIONet *n = opaque; |
1134 |
int ret, i, link_down;
|
1135 |
|
1136 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
1137 |
return -EINVAL;
|
1138 |
|
1139 |
ret = virtio_load(&n->vdev, f); |
1140 |
if (ret) {
|
1141 |
return ret;
|
1142 |
} |
1143 |
|
1144 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
1145 |
n->vqs[0].tx_waiting = qemu_get_be32(f);
|
1146 |
|
1147 |
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); |
1148 |
|
1149 |
if (version_id >= 3) |
1150 |
n->status = qemu_get_be16(f); |
1151 |
|
1152 |
if (version_id >= 4) { |
1153 |
if (version_id < 8) { |
1154 |
n->promisc = qemu_get_be32(f); |
1155 |
n->allmulti = qemu_get_be32(f); |
1156 |
} else {
|
1157 |
n->promisc = qemu_get_byte(f); |
1158 |
n->allmulti = qemu_get_byte(f); |
1159 |
} |
1160 |
} |
1161 |
|
1162 |
if (version_id >= 5) { |
1163 |
n->mac_table.in_use = qemu_get_be32(f); |
1164 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
1165 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
1166 |
qemu_get_buffer(f, n->mac_table.macs, |
1167 |
n->mac_table.in_use * ETH_ALEN); |
1168 |
} else if (n->mac_table.in_use) { |
1169 |
uint8_t *buf = g_malloc0(n->mac_table.in_use); |
1170 |
qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); |
1171 |
g_free(buf); |
1172 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
1173 |
n->mac_table.in_use = 0;
|
1174 |
} |
1175 |
} |
1176 |
|
1177 |
if (version_id >= 6) |
1178 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
1179 |
|
1180 |
if (version_id >= 7) { |
1181 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
1182 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
1183 |
return -1; |
1184 |
} |
1185 |
|
1186 |
if (n->has_vnet_hdr) {
|
1187 |
tap_set_offload(qemu_get_queue(n->nic)->peer, |
1188 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
1189 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
1190 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
1191 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
1192 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
1193 |
} |
1194 |
} |
1195 |
|
1196 |
if (version_id >= 9) { |
1197 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
1198 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
1199 |
} |
1200 |
|
1201 |
if (version_id >= 10) { |
1202 |
n->alluni = qemu_get_byte(f); |
1203 |
n->nomulti = qemu_get_byte(f); |
1204 |
n->nouni = qemu_get_byte(f); |
1205 |
n->nobcast = qemu_get_byte(f); |
1206 |
} |
1207 |
|
1208 |
if (version_id >= 11) { |
1209 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
1210 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
1211 |
return -1; |
1212 |
} |
1213 |
} |
1214 |
|
1215 |
if (n->max_queues > 1) { |
1216 |
if (n->max_queues != qemu_get_be16(f)) {
|
1217 |
error_report("virtio-net: different max_queues ");
|
1218 |
return -1; |
1219 |
} |
1220 |
|
1221 |
n->curr_queues = qemu_get_be16(f); |
1222 |
for (i = 1; i < n->curr_queues; i++) { |
1223 |
n->vqs[i].tx_waiting = qemu_get_be32(f); |
1224 |
} |
1225 |
} |
1226 |
|
1227 |
virtio_net_set_queues(n); |
1228 |
|
1229 |
/* Find the first multicast entry in the saved MAC filter */
|
1230 |
for (i = 0; i < n->mac_table.in_use; i++) { |
1231 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
1232 |
break;
|
1233 |
} |
1234 |
} |
1235 |
n->mac_table.first_multi = i; |
1236 |
|
1237 |
/* nc.link_down can't be migrated, so infer link_down according
|
1238 |
* to link status bit in n->status */
|
1239 |
link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
|
1240 |
for (i = 0; i < n->max_queues; i++) { |
1241 |
qemu_get_subqueue(n->nic, i)->link_down = link_down; |
1242 |
} |
1243 |
|
1244 |
return 0; |
1245 |
} |
1246 |
|
1247 |
static void virtio_net_cleanup(NetClientState *nc) |
1248 |
{ |
1249 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
1250 |
|
1251 |
n->nic = NULL;
|
1252 |
} |
1253 |
|
1254 |
static NetClientInfo net_virtio_info = {
|
1255 |
.type = NET_CLIENT_OPTIONS_KIND_NIC, |
1256 |
.size = sizeof(NICState),
|
1257 |
.can_receive = virtio_net_can_receive, |
1258 |
.receive = virtio_net_receive, |
1259 |
.cleanup = virtio_net_cleanup, |
1260 |
.link_status_changed = virtio_net_set_link_status, |
1261 |
}; |
1262 |
|
1263 |
static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) |
1264 |
{ |
1265 |
VirtIONet *n = to_virtio_net(vdev); |
1266 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
1267 |
assert(n->vhost_started); |
1268 |
return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx);
|
1269 |
} |
1270 |
|
1271 |
static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, |
1272 |
bool mask)
|
1273 |
{ |
1274 |
VirtIONet *n = to_virtio_net(vdev); |
1275 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
1276 |
assert(n->vhost_started); |
1277 |
vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), |
1278 |
vdev, idx, mask); |
1279 |
} |
1280 |
|
1281 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, |
1282 |
virtio_net_conf *net, |
1283 |
uint32_t host_features) |
1284 |
{ |
1285 |
VirtIONet *n; |
1286 |
int i;
|
1287 |
|
1288 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
1289 |
sizeof(struct virtio_net_config), |
1290 |
sizeof(VirtIONet));
|
1291 |
|
1292 |
n->vdev.get_config = virtio_net_get_config; |
1293 |
n->vdev.set_config = virtio_net_set_config; |
1294 |
n->vdev.get_features = virtio_net_get_features; |
1295 |
n->vdev.set_features = virtio_net_set_features; |
1296 |
n->vdev.bad_features = virtio_net_bad_features; |
1297 |
n->vdev.reset = virtio_net_reset; |
1298 |
n->vdev.set_status = virtio_net_set_status; |
1299 |
n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; |
1300 |
n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; |
1301 |
n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); |
1302 |
n->max_queues = conf->queues; |
1303 |
n->curr_queues = 1;
|
1304 |
n->vqs[0].n = n;
|
1305 |
n->tx_timeout = net->txtimer; |
1306 |
|
1307 |
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { |
1308 |
error_report("virtio-net: "
|
1309 |
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
1310 |
net->tx); |
1311 |
error_report("Defaulting to \"bh\"");
|
1312 |
} |
1313 |
|
1314 |
if (net->tx && !strcmp(net->tx, "timer")) { |
1315 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
1316 |
virtio_net_handle_tx_timer); |
1317 |
n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer,
|
1318 |
&n->vqs[0]);
|
1319 |
} else {
|
1320 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
1321 |
virtio_net_handle_tx_bh); |
1322 |
n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); |
1323 |
} |
1324 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
1325 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
1326 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
1327 |
n->status = VIRTIO_NET_S_LINK_UP; |
1328 |
|
1329 |
n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); |
1330 |
peer_test_vnet_hdr(n); |
1331 |
if (peer_has_vnet_hdr(n)) {
|
1332 |
for (i = 0; i < n->max_queues; i++) { |
1333 |
tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
|
1334 |
} |
1335 |
n->host_hdr_len = sizeof(struct virtio_net_hdr); |
1336 |
} else {
|
1337 |
n->host_hdr_len = 0;
|
1338 |
} |
1339 |
|
1340 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a); |
1341 |
|
1342 |
n->vqs[0].tx_waiting = 0; |
1343 |
n->tx_burst = net->txburst; |
1344 |
virtio_net_set_mrg_rx_bufs(n, 0);
|
1345 |
n->promisc = 1; /* for compatibility */ |
1346 |
|
1347 |
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); |
1348 |
|
1349 |
n->vlans = g_malloc0(MAX_VLAN >> 3);
|
1350 |
|
1351 |
n->qdev = dev; |
1352 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
1353 |
virtio_net_save, virtio_net_load, n); |
1354 |
|
1355 |
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
|
1356 |
|
1357 |
return &n->vdev;
|
1358 |
} |
1359 |
|
1360 |
void virtio_net_exit(VirtIODevice *vdev)
|
1361 |
{ |
1362 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
1363 |
int i;
|
1364 |
|
1365 |
/* This will stop vhost backend if appropriate. */
|
1366 |
virtio_net_set_status(vdev, 0);
|
1367 |
|
1368 |
unregister_savevm(n->qdev, "virtio-net", n);
|
1369 |
|
1370 |
g_free(n->mac_table.macs); |
1371 |
g_free(n->vlans); |
1372 |
|
1373 |
for (i = 0; i < n->max_queues; i++) { |
1374 |
VirtIONetQueue *q = &n->vqs[i]; |
1375 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
1376 |
|
1377 |
qemu_purge_queued_packets(nc); |
1378 |
|
1379 |
if (q->tx_timer) {
|
1380 |
qemu_del_timer(q->tx_timer); |
1381 |
qemu_free_timer(q->tx_timer); |
1382 |
} else {
|
1383 |
qemu_bh_delete(q->tx_bh); |
1384 |
} |
1385 |
} |
1386 |
|
1387 |
qemu_del_nic(n->nic); |
1388 |
virtio_cleanup(&n->vdev); |
1389 |
} |