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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; |
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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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size_t config_size; |
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} VirtIONet; |
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/*
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* Calculate the number of bytes up to and including the given 'field' of
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* 'container'.
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*/
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#define endof(container, field) \
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(offsetof(container, field) + sizeof(((container *)0)->field)) |
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typedef struct VirtIOFeature { |
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uint32_t flags; |
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size_t end; |
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} VirtIOFeature; |
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static VirtIOFeature feature_sizes[] = {
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{.flags = 1 << VIRTIO_NET_F_MAC,
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.end = endof(struct virtio_net_config, mac)},
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{.flags = 1 << VIRTIO_NET_F_STATUS,
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.end = endof(struct virtio_net_config, status)},
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{.flags = 1 << VIRTIO_NET_F_MQ,
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.end = endof(struct virtio_net_config, max_virtqueue_pairs)},
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{} |
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}; |
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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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/* 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, n->config_size); |
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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, n->config_size); |
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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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} |
319 |
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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); |
323 |
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if (!nc->peer) {
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return 0; |
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} |
327 |
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328 |
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return 0; |
330 |
} |
331 |
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return tap_enable(nc->peer);
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} |
334 |
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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); |
338 |
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if (!nc->peer) {
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return 0; |
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} |
342 |
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if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
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return 0; |
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} |
346 |
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return tap_disable(nc->peer);
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} |
349 |
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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++) { |
355 |
if (i < n->curr_queues) {
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assert(!peer_attach(n, i)); |
357 |
} else {
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assert(!peer_detach(n, i)); |
359 |
} |
360 |
} |
361 |
} |
362 |
|
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static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl); |
364 |
|
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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); |
368 |
NetClientState *nc = qemu_get_queue(n->nic); |
369 |
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features |= (1 << VIRTIO_NET_F_MAC);
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if (!peer_has_vnet_hdr(n)) {
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373 |
features &= ~(0x1 << VIRTIO_NET_F_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
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375 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
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376 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
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377 |
|
378 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
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379 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
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380 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
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} |
383 |
|
384 |
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
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385 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
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386 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
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387 |
} |
388 |
|
389 |
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
390 |
return features;
|
391 |
} |
392 |
if (!tap_get_vhost_net(nc->peer)) {
|
393 |
return features;
|
394 |
} |
395 |
return vhost_net_get_features(tap_get_vhost_net(nc->peer), features);
|
396 |
} |
397 |
|
398 |
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
|
399 |
{ |
400 |
uint32_t features = 0;
|
401 |
|
402 |
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
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403 |
* but also these: */
|
404 |
features |= (1 << VIRTIO_NET_F_MAC);
|
405 |
features |= (1 << VIRTIO_NET_F_CSUM);
|
406 |
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
|
407 |
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
|
408 |
features |= (1 << VIRTIO_NET_F_HOST_ECN);
|
409 |
|
410 |
return features;
|
411 |
} |
412 |
|
413 |
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
414 |
{ |
415 |
VirtIONet *n = to_virtio_net(vdev); |
416 |
int i;
|
417 |
|
418 |
virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)),
|
419 |
!!(features & (1 << VIRTIO_NET_F_CTRL_VQ)));
|
420 |
|
421 |
virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
|
422 |
|
423 |
if (n->has_vnet_hdr) {
|
424 |
tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
|
425 |
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
426 |
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
427 |
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
428 |
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
429 |
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
430 |
} |
431 |
|
432 |
for (i = 0; i < n->max_queues; i++) { |
433 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
434 |
|
435 |
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
436 |
continue;
|
437 |
} |
438 |
if (!tap_get_vhost_net(nc->peer)) {
|
439 |
continue;
|
440 |
} |
441 |
vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); |
442 |
} |
443 |
} |
444 |
|
445 |
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
446 |
struct iovec *iov, unsigned int iov_cnt) |
447 |
{ |
448 |
uint8_t on; |
449 |
size_t s; |
450 |
|
451 |
s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); |
452 |
if (s != sizeof(on)) { |
453 |
return VIRTIO_NET_ERR;
|
454 |
} |
455 |
|
456 |
if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
|
457 |
n->promisc = on; |
458 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { |
459 |
n->allmulti = on; |
460 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { |
461 |
n->alluni = on; |
462 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { |
463 |
n->nomulti = on; |
464 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { |
465 |
n->nouni = on; |
466 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { |
467 |
n->nobcast = on; |
468 |
} else {
|
469 |
return VIRTIO_NET_ERR;
|
470 |
} |
471 |
|
472 |
return VIRTIO_NET_OK;
|
473 |
} |
474 |
|
475 |
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
476 |
struct iovec *iov, unsigned int iov_cnt) |
477 |
{ |
478 |
struct virtio_net_ctrl_mac mac_data;
|
479 |
size_t s; |
480 |
|
481 |
if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
|
482 |
if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { |
483 |
return VIRTIO_NET_ERR;
|
484 |
} |
485 |
s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); |
486 |
assert(s == sizeof(n->mac));
|
487 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); |
488 |
return VIRTIO_NET_OK;
|
489 |
} |
490 |
|
491 |
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
|
492 |
return VIRTIO_NET_ERR;
|
493 |
} |
494 |
|
495 |
n->mac_table.in_use = 0;
|
496 |
n->mac_table.first_multi = 0;
|
497 |
n->mac_table.uni_overflow = 0;
|
498 |
n->mac_table.multi_overflow = 0;
|
499 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
500 |
|
501 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
502 |
sizeof(mac_data.entries));
|
503 |
mac_data.entries = ldl_p(&mac_data.entries); |
504 |
if (s != sizeof(mac_data.entries)) { |
505 |
return VIRTIO_NET_ERR;
|
506 |
} |
507 |
iov_discard_front(&iov, &iov_cnt, s); |
508 |
|
509 |
if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
|
510 |
return VIRTIO_NET_ERR;
|
511 |
} |
512 |
|
513 |
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
514 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
515 |
mac_data.entries * ETH_ALEN); |
516 |
if (s != mac_data.entries * ETH_ALEN) {
|
517 |
return VIRTIO_NET_ERR;
|
518 |
} |
519 |
n->mac_table.in_use += mac_data.entries; |
520 |
} else {
|
521 |
n->mac_table.uni_overflow = 1;
|
522 |
} |
523 |
|
524 |
iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); |
525 |
|
526 |
n->mac_table.first_multi = n->mac_table.in_use; |
527 |
|
528 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
529 |
sizeof(mac_data.entries));
|
530 |
mac_data.entries = ldl_p(&mac_data.entries); |
531 |
if (s != sizeof(mac_data.entries)) { |
532 |
return VIRTIO_NET_ERR;
|
533 |
} |
534 |
|
535 |
iov_discard_front(&iov, &iov_cnt, s); |
536 |
|
537 |
if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
|
538 |
return VIRTIO_NET_ERR;
|
539 |
} |
540 |
|
541 |
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
|
542 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
543 |
mac_data.entries * ETH_ALEN); |
544 |
if (s != mac_data.entries * ETH_ALEN) {
|
545 |
return VIRTIO_NET_ERR;
|
546 |
} |
547 |
n->mac_table.in_use += mac_data.entries; |
548 |
} else {
|
549 |
n->mac_table.multi_overflow = 1;
|
550 |
} |
551 |
|
552 |
return VIRTIO_NET_OK;
|
553 |
} |
554 |
|
555 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
556 |
struct iovec *iov, unsigned int iov_cnt) |
557 |
{ |
558 |
uint16_t vid; |
559 |
size_t s; |
560 |
|
561 |
s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); |
562 |
vid = lduw_p(&vid); |
563 |
if (s != sizeof(vid)) { |
564 |
return VIRTIO_NET_ERR;
|
565 |
} |
566 |
|
567 |
if (vid >= MAX_VLAN)
|
568 |
return VIRTIO_NET_ERR;
|
569 |
|
570 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
571 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
572 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
573 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
574 |
else
|
575 |
return VIRTIO_NET_ERR;
|
576 |
|
577 |
return VIRTIO_NET_OK;
|
578 |
} |
579 |
|
580 |
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, |
581 |
VirtQueueElement *elem) |
582 |
{ |
583 |
struct virtio_net_ctrl_mq s;
|
584 |
|
585 |
if (elem->out_num != 2 || |
586 |
elem->out_sg[1].iov_len != sizeof(struct virtio_net_ctrl_mq)) { |
587 |
error_report("virtio-net ctrl invalid steering command");
|
588 |
return VIRTIO_NET_ERR;
|
589 |
} |
590 |
|
591 |
if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
|
592 |
return VIRTIO_NET_ERR;
|
593 |
} |
594 |
|
595 |
memcpy(&s, elem->out_sg[1].iov_base, sizeof(struct virtio_net_ctrl_mq)); |
596 |
|
597 |
if (s.virtqueue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
|
598 |
s.virtqueue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || |
599 |
s.virtqueue_pairs > n->max_queues || |
600 |
!n->multiqueue) { |
601 |
return VIRTIO_NET_ERR;
|
602 |
} |
603 |
|
604 |
n->curr_queues = s.virtqueue_pairs; |
605 |
/* stop the backend before changing the number of queues to avoid handling a
|
606 |
* disabled queue */
|
607 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
608 |
virtio_net_set_queues(n); |
609 |
|
610 |
return VIRTIO_NET_OK;
|
611 |
} |
612 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
613 |
{ |
614 |
VirtIONet *n = to_virtio_net(vdev); |
615 |
struct virtio_net_ctrl_hdr ctrl;
|
616 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
617 |
VirtQueueElement elem; |
618 |
size_t s; |
619 |
struct iovec *iov;
|
620 |
unsigned int iov_cnt; |
621 |
|
622 |
while (virtqueue_pop(vq, &elem)) {
|
623 |
if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || |
624 |
iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
|
625 |
error_report("virtio-net ctrl missing headers");
|
626 |
exit(1);
|
627 |
} |
628 |
|
629 |
iov = elem.out_sg; |
630 |
iov_cnt = elem.out_num; |
631 |
s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); |
632 |
iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
|
633 |
if (s != sizeof(ctrl)) { |
634 |
status = VIRTIO_NET_ERR; |
635 |
} else if (ctrl.class == VIRTIO_NET_CTRL_RX) { |
636 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); |
637 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { |
638 |
status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); |
639 |
} else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { |
640 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); |
641 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { |
642 |
status = virtio_net_handle_mq(n, ctrl.cmd, &elem); |
643 |
} |
644 |
|
645 |
s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); |
646 |
assert(s == sizeof(status));
|
647 |
|
648 |
virtqueue_push(vq, &elem, sizeof(status));
|
649 |
virtio_notify(vdev, vq); |
650 |
} |
651 |
} |
652 |
|
653 |
/* RX */
|
654 |
|
655 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
656 |
{ |
657 |
VirtIONet *n = to_virtio_net(vdev); |
658 |
int queue_index = vq2q(virtio_get_queue_index(vq));
|
659 |
|
660 |
qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); |
661 |
} |
662 |
|
663 |
static int virtio_net_can_receive(NetClientState *nc) |
664 |
{ |
665 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
666 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
667 |
|
668 |
if (!n->vdev.vm_running) {
|
669 |
return 0; |
670 |
} |
671 |
|
672 |
if (nc->queue_index >= n->curr_queues) {
|
673 |
return 0; |
674 |
} |
675 |
|
676 |
if (!virtio_queue_ready(q->rx_vq) ||
|
677 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
678 |
return 0; |
679 |
} |
680 |
|
681 |
return 1; |
682 |
} |
683 |
|
684 |
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) |
685 |
{ |
686 |
VirtIONet *n = q->n; |
687 |
if (virtio_queue_empty(q->rx_vq) ||
|
688 |
(n->mergeable_rx_bufs && |
689 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
690 |
virtio_queue_set_notification(q->rx_vq, 1);
|
691 |
|
692 |
/* To avoid a race condition where the guest has made some buffers
|
693 |
* available after the above check but before notification was
|
694 |
* enabled, check for available buffers again.
|
695 |
*/
|
696 |
if (virtio_queue_empty(q->rx_vq) ||
|
697 |
(n->mergeable_rx_bufs && |
698 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
699 |
return 0; |
700 |
} |
701 |
} |
702 |
|
703 |
virtio_queue_set_notification(q->rx_vq, 0);
|
704 |
return 1; |
705 |
} |
706 |
|
707 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
708 |
* it never finds out that the packets don't have valid checksums. This
|
709 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
710 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
711 |
* dhclient yet.
|
712 |
*
|
713 |
* To avoid breaking existing guests, we catch udp packets and add
|
714 |
* checksums. This is terrible but it's better than hacking the guest
|
715 |
* kernels.
|
716 |
*
|
717 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
718 |
* we should provide a mechanism to disable it to avoid polluting the host
|
719 |
* cache.
|
720 |
*/
|
721 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
722 |
uint8_t *buf, size_t size) |
723 |
{ |
724 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
725 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
726 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
727 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
728 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
729 |
net_checksum_calculate(buf, size); |
730 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
731 |
} |
732 |
} |
733 |
|
734 |
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, |
735 |
const void *buf, size_t size) |
736 |
{ |
737 |
if (n->has_vnet_hdr) {
|
738 |
/* FIXME this cast is evil */
|
739 |
void *wbuf = (void *)buf; |
740 |
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, |
741 |
size - n->host_hdr_len); |
742 |
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); |
743 |
} else {
|
744 |
struct virtio_net_hdr hdr = {
|
745 |
.flags = 0,
|
746 |
.gso_type = VIRTIO_NET_HDR_GSO_NONE |
747 |
}; |
748 |
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); |
749 |
} |
750 |
} |
751 |
|
752 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
753 |
{ |
754 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
755 |
static const uint8_t vlan[] = {0x81, 0x00}; |
756 |
uint8_t *ptr = (uint8_t *)buf; |
757 |
int i;
|
758 |
|
759 |
if (n->promisc)
|
760 |
return 1; |
761 |
|
762 |
ptr += n->host_hdr_len; |
763 |
|
764 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
765 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
766 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
767 |
return 0; |
768 |
} |
769 |
|
770 |
if (ptr[0] & 1) { // multicast |
771 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
772 |
return !n->nobcast;
|
773 |
} else if (n->nomulti) { |
774 |
return 0; |
775 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
776 |
return 1; |
777 |
} |
778 |
|
779 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
780 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
781 |
return 1; |
782 |
} |
783 |
} |
784 |
} else { // unicast |
785 |
if (n->nouni) {
|
786 |
return 0; |
787 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
788 |
return 1; |
789 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
790 |
return 1; |
791 |
} |
792 |
|
793 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
794 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
795 |
return 1; |
796 |
} |
797 |
} |
798 |
} |
799 |
|
800 |
return 0; |
801 |
} |
802 |
|
803 |
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
804 |
{ |
805 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
806 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
807 |
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
|
808 |
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
809 |
unsigned mhdr_cnt = 0; |
810 |
size_t offset, i, guest_offset; |
811 |
|
812 |
if (!virtio_net_can_receive(nc)) {
|
813 |
return -1; |
814 |
} |
815 |
|
816 |
/* hdr_len refers to the header we supply to the guest */
|
817 |
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
|
818 |
return 0; |
819 |
} |
820 |
|
821 |
if (!receive_filter(n, buf, size))
|
822 |
return size;
|
823 |
|
824 |
offset = i = 0;
|
825 |
|
826 |
while (offset < size) {
|
827 |
VirtQueueElement elem; |
828 |
int len, total;
|
829 |
const struct iovec *sg = elem.in_sg; |
830 |
|
831 |
total = 0;
|
832 |
|
833 |
if (virtqueue_pop(q->rx_vq, &elem) == 0) { |
834 |
if (i == 0) |
835 |
return -1; |
836 |
error_report("virtio-net unexpected empty queue: "
|
837 |
"i %zd mergeable %d offset %zd, size %zd, "
|
838 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
|
839 |
i, n->mergeable_rx_bufs, offset, size, |
840 |
n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); |
841 |
exit(1);
|
842 |
} |
843 |
|
844 |
if (elem.in_num < 1) { |
845 |
error_report("virtio-net receive queue contains no in buffers");
|
846 |
exit(1);
|
847 |
} |
848 |
|
849 |
if (i == 0) { |
850 |
assert(offset == 0);
|
851 |
if (n->mergeable_rx_bufs) {
|
852 |
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), |
853 |
sg, elem.in_num, |
854 |
offsetof(typeof(mhdr), num_buffers), |
855 |
sizeof(mhdr.num_buffers));
|
856 |
} |
857 |
|
858 |
receive_header(n, sg, elem.in_num, buf, size); |
859 |
offset = n->host_hdr_len; |
860 |
total += n->guest_hdr_len; |
861 |
guest_offset = n->guest_hdr_len; |
862 |
} else {
|
863 |
guest_offset = 0;
|
864 |
} |
865 |
|
866 |
/* copy in packet. ugh */
|
867 |
len = iov_from_buf(sg, elem.in_num, guest_offset, |
868 |
buf + offset, size - offset); |
869 |
total += len; |
870 |
offset += len; |
871 |
/* If buffers can't be merged, at this point we
|
872 |
* must have consumed the complete packet.
|
873 |
* Otherwise, drop it. */
|
874 |
if (!n->mergeable_rx_bufs && offset < size) {
|
875 |
#if 0
|
876 |
error_report("virtio-net truncated non-mergeable packet: "
|
877 |
"i %zd mergeable %d offset %zd, size %zd, "
|
878 |
"guest hdr len %zd, host hdr len %zd",
|
879 |
i, n->mergeable_rx_bufs,
|
880 |
offset, size, n->guest_hdr_len, n->host_hdr_len);
|
881 |
#endif
|
882 |
return size;
|
883 |
} |
884 |
|
885 |
/* signal other side */
|
886 |
virtqueue_fill(q->rx_vq, &elem, total, i++); |
887 |
} |
888 |
|
889 |
if (mhdr_cnt) {
|
890 |
stw_p(&mhdr.num_buffers, i); |
891 |
iov_from_buf(mhdr_sg, mhdr_cnt, |
892 |
0,
|
893 |
&mhdr.num_buffers, sizeof mhdr.num_buffers);
|
894 |
} |
895 |
|
896 |
virtqueue_flush(q->rx_vq, i); |
897 |
virtio_notify(&n->vdev, q->rx_vq); |
898 |
|
899 |
return size;
|
900 |
} |
901 |
|
902 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
|
903 |
|
904 |
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) |
905 |
{ |
906 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
907 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
908 |
|
909 |
virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
|
910 |
virtio_notify(&n->vdev, q->tx_vq); |
911 |
|
912 |
q->async_tx.elem.out_num = q->async_tx.len = 0;
|
913 |
|
914 |
virtio_queue_set_notification(q->tx_vq, 1);
|
915 |
virtio_net_flush_tx(q); |
916 |
} |
917 |
|
918 |
/* TX */
|
919 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
920 |
{ |
921 |
VirtIONet *n = q->n; |
922 |
VirtQueueElement elem; |
923 |
int32_t num_packets = 0;
|
924 |
int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
|
925 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
926 |
return num_packets;
|
927 |
} |
928 |
|
929 |
assert(n->vdev.vm_running); |
930 |
|
931 |
if (q->async_tx.elem.out_num) {
|
932 |
virtio_queue_set_notification(q->tx_vq, 0);
|
933 |
return num_packets;
|
934 |
} |
935 |
|
936 |
while (virtqueue_pop(q->tx_vq, &elem)) {
|
937 |
ssize_t ret, len; |
938 |
unsigned int out_num = elem.out_num; |
939 |
struct iovec *out_sg = &elem.out_sg[0]; |
940 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
941 |
|
942 |
if (out_num < 1) { |
943 |
error_report("virtio-net header not in first element");
|
944 |
exit(1);
|
945 |
} |
946 |
|
947 |
/*
|
948 |
* If host wants to see the guest header as is, we can
|
949 |
* pass it on unchanged. Otherwise, copy just the parts
|
950 |
* that host is interested in.
|
951 |
*/
|
952 |
assert(n->host_hdr_len <= n->guest_hdr_len); |
953 |
if (n->host_hdr_len != n->guest_hdr_len) {
|
954 |
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
|
955 |
out_sg, out_num, |
956 |
0, n->host_hdr_len);
|
957 |
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, |
958 |
out_sg, out_num, |
959 |
n->guest_hdr_len, -1);
|
960 |
out_num = sg_num; |
961 |
out_sg = sg; |
962 |
} |
963 |
|
964 |
len = n->guest_hdr_len; |
965 |
|
966 |
ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), |
967 |
out_sg, out_num, virtio_net_tx_complete); |
968 |
if (ret == 0) { |
969 |
virtio_queue_set_notification(q->tx_vq, 0);
|
970 |
q->async_tx.elem = elem; |
971 |
q->async_tx.len = len; |
972 |
return -EBUSY;
|
973 |
} |
974 |
|
975 |
len += ret; |
976 |
|
977 |
virtqueue_push(q->tx_vq, &elem, 0);
|
978 |
virtio_notify(&n->vdev, q->tx_vq); |
979 |
|
980 |
if (++num_packets >= n->tx_burst) {
|
981 |
break;
|
982 |
} |
983 |
} |
984 |
return num_packets;
|
985 |
} |
986 |
|
987 |
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) |
988 |
{ |
989 |
VirtIONet *n = to_virtio_net(vdev); |
990 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
991 |
|
992 |
/* This happens when device was stopped but VCPU wasn't. */
|
993 |
if (!n->vdev.vm_running) {
|
994 |
q->tx_waiting = 1;
|
995 |
return;
|
996 |
} |
997 |
|
998 |
if (q->tx_waiting) {
|
999 |
virtio_queue_set_notification(vq, 1);
|
1000 |
qemu_del_timer(q->tx_timer); |
1001 |
q->tx_waiting = 0;
|
1002 |
virtio_net_flush_tx(q); |
1003 |
} else {
|
1004 |
qemu_mod_timer(q->tx_timer, |
1005 |
qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
1006 |
q->tx_waiting = 1;
|
1007 |
virtio_queue_set_notification(vq, 0);
|
1008 |
} |
1009 |
} |
1010 |
|
1011 |
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) |
1012 |
{ |
1013 |
VirtIONet *n = to_virtio_net(vdev); |
1014 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
1015 |
|
1016 |
if (unlikely(q->tx_waiting)) {
|
1017 |
return;
|
1018 |
} |
1019 |
q->tx_waiting = 1;
|
1020 |
/* This happens when device was stopped but VCPU wasn't. */
|
1021 |
if (!n->vdev.vm_running) {
|
1022 |
return;
|
1023 |
} |
1024 |
virtio_queue_set_notification(vq, 0);
|
1025 |
qemu_bh_schedule(q->tx_bh); |
1026 |
} |
1027 |
|
1028 |
static void virtio_net_tx_timer(void *opaque) |
1029 |
{ |
1030 |
VirtIONetQueue *q = opaque; |
1031 |
VirtIONet *n = q->n; |
1032 |
assert(n->vdev.vm_running); |
1033 |
|
1034 |
q->tx_waiting = 0;
|
1035 |
|
1036 |
/* Just in case the driver is not ready on more */
|
1037 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
1038 |
return;
|
1039 |
|
1040 |
virtio_queue_set_notification(q->tx_vq, 1);
|
1041 |
virtio_net_flush_tx(q); |
1042 |
} |
1043 |
|
1044 |
static void virtio_net_tx_bh(void *opaque) |
1045 |
{ |
1046 |
VirtIONetQueue *q = opaque; |
1047 |
VirtIONet *n = q->n; |
1048 |
int32_t ret; |
1049 |
|
1050 |
assert(n->vdev.vm_running); |
1051 |
|
1052 |
q->tx_waiting = 0;
|
1053 |
|
1054 |
/* Just in case the driver is not ready on more */
|
1055 |
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
1056 |
return;
|
1057 |
|
1058 |
ret = virtio_net_flush_tx(q); |
1059 |
if (ret == -EBUSY) {
|
1060 |
return; /* Notification re-enable handled by tx_complete */ |
1061 |
} |
1062 |
|
1063 |
/* If we flush a full burst of packets, assume there are
|
1064 |
* more coming and immediately reschedule */
|
1065 |
if (ret >= n->tx_burst) {
|
1066 |
qemu_bh_schedule(q->tx_bh); |
1067 |
q->tx_waiting = 1;
|
1068 |
return;
|
1069 |
} |
1070 |
|
1071 |
/* If less than a full burst, re-enable notification and flush
|
1072 |
* anything that may have come in while we weren't looking. If
|
1073 |
* we find something, assume the guest is still active and reschedule */
|
1074 |
virtio_queue_set_notification(q->tx_vq, 1);
|
1075 |
if (virtio_net_flush_tx(q) > 0) { |
1076 |
virtio_queue_set_notification(q->tx_vq, 0);
|
1077 |
qemu_bh_schedule(q->tx_bh); |
1078 |
q->tx_waiting = 1;
|
1079 |
} |
1080 |
} |
1081 |
|
1082 |
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) |
1083 |
{ |
1084 |
VirtIODevice *vdev = &n->vdev; |
1085 |
int i, max = multiqueue ? n->max_queues : 1; |
1086 |
|
1087 |
n->multiqueue = multiqueue; |
1088 |
|
1089 |
for (i = 2; i <= n->max_queues * 2 + 1; i++) { |
1090 |
virtio_del_queue(vdev, i); |
1091 |
} |
1092 |
|
1093 |
for (i = 1; i < max; i++) { |
1094 |
n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
|
1095 |
if (n->vqs[i].tx_timer) {
|
1096 |
n->vqs[i].tx_vq = |
1097 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
|
1098 |
n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, |
1099 |
virtio_net_tx_timer, |
1100 |
&n->vqs[i]); |
1101 |
} else {
|
1102 |
n->vqs[i].tx_vq = |
1103 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
|
1104 |
n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); |
1105 |
} |
1106 |
|
1107 |
n->vqs[i].tx_waiting = 0;
|
1108 |
n->vqs[i].n = n; |
1109 |
} |
1110 |
|
1111 |
if (ctrl) {
|
1112 |
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
|
1113 |
} |
1114 |
|
1115 |
virtio_net_set_queues(n); |
1116 |
} |
1117 |
|
1118 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
1119 |
{ |
1120 |
int i;
|
1121 |
VirtIONet *n = opaque; |
1122 |
|
1123 |
/* At this point, backend must be stopped, otherwise
|
1124 |
* it might keep writing to memory. */
|
1125 |
assert(!n->vhost_started); |
1126 |
virtio_save(&n->vdev, f); |
1127 |
|
1128 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
1129 |
qemu_put_be32(f, n->vqs[0].tx_waiting);
|
1130 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
1131 |
qemu_put_be16(f, n->status); |
1132 |
qemu_put_byte(f, n->promisc); |
1133 |
qemu_put_byte(f, n->allmulti); |
1134 |
qemu_put_be32(f, n->mac_table.in_use); |
1135 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
1136 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
1137 |
qemu_put_be32(f, n->has_vnet_hdr); |
1138 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
1139 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
1140 |
qemu_put_byte(f, n->alluni); |
1141 |
qemu_put_byte(f, n->nomulti); |
1142 |
qemu_put_byte(f, n->nouni); |
1143 |
qemu_put_byte(f, n->nobcast); |
1144 |
qemu_put_byte(f, n->has_ufo); |
1145 |
if (n->max_queues > 1) { |
1146 |
qemu_put_be16(f, n->max_queues); |
1147 |
qemu_put_be16(f, n->curr_queues); |
1148 |
for (i = 1; i < n->curr_queues; i++) { |
1149 |
qemu_put_be32(f, n->vqs[i].tx_waiting); |
1150 |
} |
1151 |
} |
1152 |
} |
1153 |
|
1154 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
1155 |
{ |
1156 |
VirtIONet *n = opaque; |
1157 |
int ret, i, link_down;
|
1158 |
|
1159 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
1160 |
return -EINVAL;
|
1161 |
|
1162 |
ret = virtio_load(&n->vdev, f); |
1163 |
if (ret) {
|
1164 |
return ret;
|
1165 |
} |
1166 |
|
1167 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
1168 |
n->vqs[0].tx_waiting = qemu_get_be32(f);
|
1169 |
|
1170 |
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); |
1171 |
|
1172 |
if (version_id >= 3) |
1173 |
n->status = qemu_get_be16(f); |
1174 |
|
1175 |
if (version_id >= 4) { |
1176 |
if (version_id < 8) { |
1177 |
n->promisc = qemu_get_be32(f); |
1178 |
n->allmulti = qemu_get_be32(f); |
1179 |
} else {
|
1180 |
n->promisc = qemu_get_byte(f); |
1181 |
n->allmulti = qemu_get_byte(f); |
1182 |
} |
1183 |
} |
1184 |
|
1185 |
if (version_id >= 5) { |
1186 |
n->mac_table.in_use = qemu_get_be32(f); |
1187 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
1188 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
1189 |
qemu_get_buffer(f, n->mac_table.macs, |
1190 |
n->mac_table.in_use * ETH_ALEN); |
1191 |
} else if (n->mac_table.in_use) { |
1192 |
uint8_t *buf = g_malloc0(n->mac_table.in_use); |
1193 |
qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); |
1194 |
g_free(buf); |
1195 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
1196 |
n->mac_table.in_use = 0;
|
1197 |
} |
1198 |
} |
1199 |
|
1200 |
if (version_id >= 6) |
1201 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
1202 |
|
1203 |
if (version_id >= 7) { |
1204 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
1205 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
1206 |
return -1; |
1207 |
} |
1208 |
|
1209 |
if (n->has_vnet_hdr) {
|
1210 |
tap_set_offload(qemu_get_queue(n->nic)->peer, |
1211 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
1212 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
1213 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
1214 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
1215 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
1216 |
} |
1217 |
} |
1218 |
|
1219 |
if (version_id >= 9) { |
1220 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
1221 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
1222 |
} |
1223 |
|
1224 |
if (version_id >= 10) { |
1225 |
n->alluni = qemu_get_byte(f); |
1226 |
n->nomulti = qemu_get_byte(f); |
1227 |
n->nouni = qemu_get_byte(f); |
1228 |
n->nobcast = qemu_get_byte(f); |
1229 |
} |
1230 |
|
1231 |
if (version_id >= 11) { |
1232 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
1233 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
1234 |
return -1; |
1235 |
} |
1236 |
} |
1237 |
|
1238 |
if (n->max_queues > 1) { |
1239 |
if (n->max_queues != qemu_get_be16(f)) {
|
1240 |
error_report("virtio-net: different max_queues ");
|
1241 |
return -1; |
1242 |
} |
1243 |
|
1244 |
n->curr_queues = qemu_get_be16(f); |
1245 |
for (i = 1; i < n->curr_queues; i++) { |
1246 |
n->vqs[i].tx_waiting = qemu_get_be32(f); |
1247 |
} |
1248 |
} |
1249 |
|
1250 |
virtio_net_set_queues(n); |
1251 |
|
1252 |
/* Find the first multicast entry in the saved MAC filter */
|
1253 |
for (i = 0; i < n->mac_table.in_use; i++) { |
1254 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
1255 |
break;
|
1256 |
} |
1257 |
} |
1258 |
n->mac_table.first_multi = i; |
1259 |
|
1260 |
/* nc.link_down can't be migrated, so infer link_down according
|
1261 |
* to link status bit in n->status */
|
1262 |
link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
|
1263 |
for (i = 0; i < n->max_queues; i++) { |
1264 |
qemu_get_subqueue(n->nic, i)->link_down = link_down; |
1265 |
} |
1266 |
|
1267 |
return 0; |
1268 |
} |
1269 |
|
1270 |
static void virtio_net_cleanup(NetClientState *nc) |
1271 |
{ |
1272 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
1273 |
|
1274 |
n->nic = NULL;
|
1275 |
} |
1276 |
|
1277 |
static NetClientInfo net_virtio_info = {
|
1278 |
.type = NET_CLIENT_OPTIONS_KIND_NIC, |
1279 |
.size = sizeof(NICState),
|
1280 |
.can_receive = virtio_net_can_receive, |
1281 |
.receive = virtio_net_receive, |
1282 |
.cleanup = virtio_net_cleanup, |
1283 |
.link_status_changed = virtio_net_set_link_status, |
1284 |
}; |
1285 |
|
1286 |
static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) |
1287 |
{ |
1288 |
VirtIONet *n = to_virtio_net(vdev); |
1289 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
1290 |
assert(n->vhost_started); |
1291 |
return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx);
|
1292 |
} |
1293 |
|
1294 |
static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, |
1295 |
bool mask)
|
1296 |
{ |
1297 |
VirtIONet *n = to_virtio_net(vdev); |
1298 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
1299 |
assert(n->vhost_started); |
1300 |
vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), |
1301 |
vdev, idx, mask); |
1302 |
} |
1303 |
|
1304 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, |
1305 |
virtio_net_conf *net, uint32_t host_features) |
1306 |
{ |
1307 |
VirtIONet *n; |
1308 |
int i, config_size = 0; |
1309 |
|
1310 |
for (i = 0; feature_sizes[i].flags != 0; i++) { |
1311 |
if (host_features & feature_sizes[i].flags) {
|
1312 |
config_size = MAX(feature_sizes[i].end, config_size); |
1313 |
} |
1314 |
} |
1315 |
|
1316 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
1317 |
config_size, sizeof(VirtIONet));
|
1318 |
|
1319 |
n->config_size = config_size; |
1320 |
n->vdev.get_config = virtio_net_get_config; |
1321 |
n->vdev.set_config = virtio_net_set_config; |
1322 |
n->vdev.get_features = virtio_net_get_features; |
1323 |
n->vdev.set_features = virtio_net_set_features; |
1324 |
n->vdev.bad_features = virtio_net_bad_features; |
1325 |
n->vdev.reset = virtio_net_reset; |
1326 |
n->vdev.set_status = virtio_net_set_status; |
1327 |
n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; |
1328 |
n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; |
1329 |
n->max_queues = MAX(conf->queues, 1);
|
1330 |
n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
|
1331 |
n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); |
1332 |
n->curr_queues = 1;
|
1333 |
n->vqs[0].n = n;
|
1334 |
n->tx_timeout = net->txtimer; |
1335 |
|
1336 |
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { |
1337 |
error_report("virtio-net: "
|
1338 |
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
1339 |
net->tx); |
1340 |
error_report("Defaulting to \"bh\"");
|
1341 |
} |
1342 |
|
1343 |
if (net->tx && !strcmp(net->tx, "timer")) { |
1344 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
1345 |
virtio_net_handle_tx_timer); |
1346 |
n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer,
|
1347 |
&n->vqs[0]);
|
1348 |
} else {
|
1349 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
1350 |
virtio_net_handle_tx_bh); |
1351 |
n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); |
1352 |
} |
1353 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
1354 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
1355 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
1356 |
n->status = VIRTIO_NET_S_LINK_UP; |
1357 |
|
1358 |
n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); |
1359 |
peer_test_vnet_hdr(n); |
1360 |
if (peer_has_vnet_hdr(n)) {
|
1361 |
for (i = 0; i < n->max_queues; i++) { |
1362 |
tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
|
1363 |
} |
1364 |
n->host_hdr_len = sizeof(struct virtio_net_hdr); |
1365 |
} else {
|
1366 |
n->host_hdr_len = 0;
|
1367 |
} |
1368 |
|
1369 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a); |
1370 |
|
1371 |
n->vqs[0].tx_waiting = 0; |
1372 |
n->tx_burst = net->txburst; |
1373 |
virtio_net_set_mrg_rx_bufs(n, 0);
|
1374 |
n->promisc = 1; /* for compatibility */ |
1375 |
|
1376 |
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); |
1377 |
|
1378 |
n->vlans = g_malloc0(MAX_VLAN >> 3);
|
1379 |
|
1380 |
n->qdev = dev; |
1381 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
1382 |
virtio_net_save, virtio_net_load, n); |
1383 |
|
1384 |
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
|
1385 |
|
1386 |
return &n->vdev;
|
1387 |
} |
1388 |
|
1389 |
void virtio_net_exit(VirtIODevice *vdev)
|
1390 |
{ |
1391 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
1392 |
int i;
|
1393 |
|
1394 |
/* This will stop vhost backend if appropriate. */
|
1395 |
virtio_net_set_status(vdev, 0);
|
1396 |
|
1397 |
unregister_savevm(n->qdev, "virtio-net", n);
|
1398 |
|
1399 |
g_free(n->mac_table.macs); |
1400 |
g_free(n->vlans); |
1401 |
|
1402 |
for (i = 0; i < n->max_queues; i++) { |
1403 |
VirtIONetQueue *q = &n->vqs[i]; |
1404 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
1405 |
|
1406 |
qemu_purge_queued_packets(nc); |
1407 |
|
1408 |
if (q->tx_timer) {
|
1409 |
qemu_del_timer(q->tx_timer); |
1410 |
qemu_free_timer(q->tx_timer); |
1411 |
} else {
|
1412 |
qemu_bh_delete(q->tx_bh); |
1413 |
} |
1414 |
} |
1415 |
|
1416 |
g_free(n->vqs); |
1417 |
qemu_del_nic(n->nic); |
1418 |
virtio_cleanup(&n->vdev); |
1419 |
} |