1087 lines
32 KiB
C
1087 lines
32 KiB
C
/*
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* Virtio Network Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "iov.h"
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#include "virtio.h"
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#include "net.h"
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#include "net/checksum.h"
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#include "net/tap.h"
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#include "qemu-error.h"
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#include "qemu-timer.h"
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#include "virtio-net.h"
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#include "vhost_net.h"
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#define VIRTIO_NET_VM_VERSION 11
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#define MAC_TABLE_ENTRIES 64
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#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
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typedef struct VirtIONet
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{
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VirtIODevice vdev;
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uint8_t mac[ETH_ALEN];
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uint16_t status;
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VirtQueue *rx_vq;
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VirtQueue *tx_vq;
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VirtQueue *ctrl_vq;
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NICState *nic;
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QEMUTimer *tx_timer;
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QEMUBH *tx_bh;
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uint32_t tx_timeout;
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int32_t tx_burst;
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int tx_waiting;
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uint32_t has_vnet_hdr;
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uint8_t has_ufo;
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struct {
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VirtQueueElement elem;
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ssize_t len;
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} async_tx;
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int mergeable_rx_bufs;
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uint8_t promisc;
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uint8_t allmulti;
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uint8_t alluni;
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uint8_t nomulti;
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uint8_t nouni;
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uint8_t nobcast;
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uint8_t vhost_started;
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bool vm_running;
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VMChangeStateEntry *vmstate;
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struct {
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int in_use;
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int first_multi;
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uint8_t multi_overflow;
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uint8_t uni_overflow;
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uint8_t *macs;
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} mac_table;
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uint32_t *vlans;
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DeviceState *qdev;
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} VirtIONet;
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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static VirtIONet *to_virtio_net(VirtIODevice *vdev)
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{
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return (VirtIONet *)vdev;
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}
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static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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VirtIONet *n = to_virtio_net(vdev);
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struct virtio_net_config netcfg;
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netcfg.status = n->status;
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memcpy(netcfg.mac, n->mac, ETH_ALEN);
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memcpy(config, &netcfg, sizeof(netcfg));
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}
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static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
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{
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VirtIONet *n = to_virtio_net(vdev);
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struct virtio_net_config netcfg;
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memcpy(&netcfg, config, sizeof(netcfg));
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if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
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memcpy(n->mac, netcfg.mac, ETH_ALEN);
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qemu_format_nic_info_str(&n->nic->nc, n->mac);
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}
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}
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static 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->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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if (!n->nic->nc.peer) {
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return;
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}
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if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
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return;
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}
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if (!tap_get_vhost_net(n->nic->nc.peer)) {
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return;
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}
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if (!!n->vhost_started == virtio_net_started(n, status)) {
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return;
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}
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if (!n->vhost_started) {
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int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
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if (r < 0) {
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error_report("unable to start vhost net: %d: "
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"falling back on userspace virtio", -r);
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} else {
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n->vhost_started = 1;
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}
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} else {
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vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
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n->vhost_started = 0;
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}
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}
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static void virtio_net_set_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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virtio_net_vhost_status(n, status);
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if (!n->tx_waiting) {
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return;
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}
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if (virtio_net_started(n, status) && !n->vhost_started) {
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if (n->tx_timer) {
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qemu_mod_timer(n->tx_timer,
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qemu_get_clock(vm_clock) + n->tx_timeout);
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} else {
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qemu_bh_schedule(n->tx_bh);
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}
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} else {
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if (n->tx_timer) {
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qemu_del_timer(n->tx_timer);
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} else {
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qemu_bh_cancel(n->tx_bh);
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}
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}
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}
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static void virtio_net_set_link_status(VLANClientState *nc)
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{
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VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
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uint16_t old_status = n->status;
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if (nc->link_down)
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n->status &= ~VIRTIO_NET_S_LINK_UP;
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else
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n->status |= VIRTIO_NET_S_LINK_UP;
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if (n->status != old_status)
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virtio_notify_config(&n->vdev);
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virtio_net_set_status(&n->vdev, n->vdev.status);
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}
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static void virtio_net_reset(VirtIODevice *vdev)
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{
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VirtIONet *n = to_virtio_net(vdev);
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/* Reset back to compatibility mode */
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n->promisc = 1;
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n->allmulti = 0;
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n->alluni = 0;
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n->nomulti = 0;
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n->nouni = 0;
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n->nobcast = 0;
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/* Flush any MAC and VLAN filter table state */
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n->mac_table.in_use = 0;
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n->mac_table.first_multi = 0;
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n->mac_table.multi_overflow = 0;
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n->mac_table.uni_overflow = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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memset(n->vlans, 0, MAX_VLAN >> 3);
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}
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static int peer_has_vnet_hdr(VirtIONet *n)
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{
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if (!n->nic->nc.peer)
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return 0;
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if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP)
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return 0;
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n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer);
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return n->has_vnet_hdr;
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}
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static int peer_has_ufo(VirtIONet *n)
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{
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if (!peer_has_vnet_hdr(n))
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return 0;
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n->has_ufo = tap_has_ufo(n->nic->nc.peer);
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return n->has_ufo;
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}
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static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
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{
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VirtIONet *n = to_virtio_net(vdev);
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features |= (1 << VIRTIO_NET_F_MAC);
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if (peer_has_vnet_hdr(n)) {
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tap_using_vnet_hdr(n->nic->nc.peer, 1);
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} else {
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features &= ~(0x1 << VIRTIO_NET_F_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
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}
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if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
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}
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if (!n->nic->nc.peer ||
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n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
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return features;
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}
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if (!tap_get_vhost_net(n->nic->nc.peer)) {
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return features;
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}
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return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer), features);
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}
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static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
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{
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uint32_t features = 0;
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/* Linux kernel 2.6.25. It understood MAC (as everyone must),
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* but also these: */
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features |= (1 << VIRTIO_NET_F_MAC);
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features |= (1 << VIRTIO_NET_F_CSUM);
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features |= (1 << VIRTIO_NET_F_HOST_TSO4);
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features |= (1 << VIRTIO_NET_F_HOST_TSO6);
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features |= (1 << VIRTIO_NET_F_HOST_ECN);
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return features;
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}
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static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
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{
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VirtIONet *n = to_virtio_net(vdev);
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n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
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if (n->has_vnet_hdr) {
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tap_set_offload(n->nic->nc.peer,
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(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
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(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
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(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
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(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
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(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
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}
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if (!n->nic->nc.peer ||
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n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
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return;
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}
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if (!tap_get_vhost_net(n->nic->nc.peer)) {
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return;
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}
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vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
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}
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static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
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VirtQueueElement *elem)
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{
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uint8_t on;
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
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error_report("virtio-net ctrl invalid rx mode command");
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exit(1);
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}
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on = ldub_p(elem->out_sg[1].iov_base);
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if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
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n->promisc = on;
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
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n->allmulti = on;
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI)
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n->alluni = on;
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI)
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n->nomulti = on;
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI)
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n->nouni = on;
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST)
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n->nobcast = on;
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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}
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static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
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VirtQueueElement *elem)
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{
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struct virtio_net_ctrl_mac mac_data;
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if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
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elem->out_sg[1].iov_len < sizeof(mac_data) ||
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elem->out_sg[2].iov_len < sizeof(mac_data))
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return VIRTIO_NET_ERR;
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n->mac_table.in_use = 0;
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n->mac_table.first_multi = 0;
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n->mac_table.uni_overflow = 0;
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n->mac_table.multi_overflow = 0;
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memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
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mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
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if (sizeof(mac_data.entries) +
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(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
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mac_data.entries * ETH_ALEN);
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n->mac_table.in_use += mac_data.entries;
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} else {
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n->mac_table.uni_overflow = 1;
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}
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n->mac_table.first_multi = n->mac_table.in_use;
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mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
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if (sizeof(mac_data.entries) +
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(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
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return VIRTIO_NET_ERR;
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if (mac_data.entries) {
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if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
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memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
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elem->out_sg[2].iov_base + sizeof(mac_data),
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mac_data.entries * ETH_ALEN);
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n->mac_table.in_use += mac_data.entries;
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} else {
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n->mac_table.multi_overflow = 1;
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}
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}
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return VIRTIO_NET_OK;
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}
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static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
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VirtQueueElement *elem)
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{
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uint16_t vid;
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if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
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error_report("virtio-net ctrl invalid vlan command");
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return VIRTIO_NET_ERR;
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}
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vid = lduw_le_p(elem->out_sg[1].iov_base);
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if (vid >= MAX_VLAN)
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return VIRTIO_NET_ERR;
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if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
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n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
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else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
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n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
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else
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return VIRTIO_NET_ERR;
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return VIRTIO_NET_OK;
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}
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static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIONet *n = to_virtio_net(vdev);
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struct virtio_net_ctrl_hdr ctrl;
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virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
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VirtQueueElement elem;
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while (virtqueue_pop(vq, &elem)) {
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if ((elem.in_num < 1) || (elem.out_num < 1)) {
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error_report("virtio-net ctrl missing headers");
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exit(1);
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}
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if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
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elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
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error_report("virtio-net ctrl header not in correct element");
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exit(1);
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}
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ctrl.class = ldub_p(elem.out_sg[0].iov_base);
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ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
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if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
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status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
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else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
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status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
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else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
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status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
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stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
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virtqueue_push(vq, &elem, sizeof(status));
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virtio_notify(vdev, vq);
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}
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}
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/* RX */
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static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
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{
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VirtIONet *n = to_virtio_net(vdev);
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qemu_flush_queued_packets(&n->nic->nc);
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/* We now have RX buffers, signal to the IO thread to break out of the
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* select to re-poll the tap file descriptor */
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qemu_notify_event();
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}
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static int virtio_net_can_receive(VLANClientState *nc)
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{
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VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
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if (!n->vm_running) {
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return 0;
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}
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if (!virtio_queue_ready(n->rx_vq) ||
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
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return 0;
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return 1;
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}
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static int virtio_net_has_buffers(VirtIONet *n, int bufsize)
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{
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if (virtio_queue_empty(n->rx_vq) ||
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(n->mergeable_rx_bufs &&
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!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
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virtio_queue_set_notification(n->rx_vq, 1);
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/* To avoid a race condition where the guest has made some buffers
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* available after the above check but before notification was
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* enabled, check for available buffers again.
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*/
|
|
if (virtio_queue_empty(n->rx_vq) ||
|
|
(n->mergeable_rx_bufs &&
|
|
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
|
|
return 0;
|
|
}
|
|
|
|
virtio_queue_set_notification(n->rx_vq, 0);
|
|
return 1;
|
|
}
|
|
|
|
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
|
* it never finds out that the packets don't have valid checksums. This
|
|
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
|
* fix this with Xen but it hasn't appeared in an upstream release of
|
|
* dhclient yet.
|
|
*
|
|
* To avoid breaking existing guests, we catch udp packets and add
|
|
* checksums. This is terrible but it's better than hacking the guest
|
|
* kernels.
|
|
*
|
|
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
|
* we should provide a mechanism to disable it to avoid polluting the host
|
|
* cache.
|
|
*/
|
|
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
|
|
const uint8_t *buf, size_t size)
|
|
{
|
|
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
|
|
(size > 27 && size < 1500) && /* normal sized MTU */
|
|
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
|
|
(buf[23] == 17) && /* ip.protocol == UDP */
|
|
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
|
|
/* FIXME this cast is evil */
|
|
net_checksum_calculate((uint8_t *)buf, size);
|
|
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
}
|
|
}
|
|
|
|
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
|
|
const void *buf, size_t size, size_t hdr_len)
|
|
{
|
|
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base;
|
|
int offset = 0;
|
|
|
|
hdr->flags = 0;
|
|
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
|
|
|
|
if (n->has_vnet_hdr) {
|
|
memcpy(hdr, buf, sizeof(*hdr));
|
|
offset = sizeof(*hdr);
|
|
work_around_broken_dhclient(hdr, buf + offset, size - offset);
|
|
}
|
|
|
|
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
|
* but we may be passing along a larger header to the guest.
|
|
*/
|
|
iov[0].iov_base += hdr_len;
|
|
iov[0].iov_len -= hdr_len;
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
|
|
{
|
|
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
|
|
static const uint8_t vlan[] = {0x81, 0x00};
|
|
uint8_t *ptr = (uint8_t *)buf;
|
|
int i;
|
|
|
|
if (n->promisc)
|
|
return 1;
|
|
|
|
if (n->has_vnet_hdr) {
|
|
ptr += sizeof(struct virtio_net_hdr);
|
|
}
|
|
|
|
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
|
|
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
|
|
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
|
|
return 0;
|
|
}
|
|
|
|
if (ptr[0] & 1) { // multicast
|
|
if (!memcmp(ptr, bcast, sizeof(bcast))) {
|
|
return !n->nobcast;
|
|
} else if (n->nomulti) {
|
|
return 0;
|
|
} else if (n->allmulti || n->mac_table.multi_overflow) {
|
|
return 1;
|
|
}
|
|
|
|
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
|
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
}
|
|
} else { // unicast
|
|
if (n->nouni) {
|
|
return 0;
|
|
} else if (n->alluni || n->mac_table.uni_overflow) {
|
|
return 1;
|
|
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
|
|
for (i = 0; i < n->mac_table.first_multi; i++) {
|
|
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
|
|
{
|
|
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
|
|
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
|
|
size_t guest_hdr_len, offset, i, host_hdr_len;
|
|
|
|
if (!virtio_net_can_receive(&n->nic->nc))
|
|
return -1;
|
|
|
|
/* hdr_len refers to the header we supply to the guest */
|
|
guest_hdr_len = n->mergeable_rx_bufs ?
|
|
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
|
|
|
|
|
|
host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
|
|
if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len))
|
|
return 0;
|
|
|
|
if (!receive_filter(n, buf, size))
|
|
return size;
|
|
|
|
offset = i = 0;
|
|
|
|
while (offset < size) {
|
|
VirtQueueElement elem;
|
|
int len, total;
|
|
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
|
|
|
total = 0;
|
|
|
|
if (virtqueue_pop(n->rx_vq, &elem) == 0) {
|
|
if (i == 0)
|
|
return -1;
|
|
error_report("virtio-net unexpected empty queue: "
|
|
"i %zd mergeable %d offset %zd, size %zd, "
|
|
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
|
|
i, n->mergeable_rx_bufs, offset, size,
|
|
guest_hdr_len, host_hdr_len, n->vdev.guest_features);
|
|
exit(1);
|
|
}
|
|
|
|
if (elem.in_num < 1) {
|
|
error_report("virtio-net receive queue contains no in buffers");
|
|
exit(1);
|
|
}
|
|
|
|
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) {
|
|
error_report("virtio-net header not in first element");
|
|
exit(1);
|
|
}
|
|
|
|
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
|
|
|
|
if (i == 0) {
|
|
if (n->mergeable_rx_bufs)
|
|
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
|
|
|
|
offset += receive_header(n, sg, elem.in_num,
|
|
buf + offset, size - offset, guest_hdr_len);
|
|
total += guest_hdr_len;
|
|
}
|
|
|
|
/* copy in packet. ugh */
|
|
len = iov_from_buf(sg, elem.in_num,
|
|
buf + offset, size - offset);
|
|
total += len;
|
|
offset += len;
|
|
/* If buffers can't be merged, at this point we
|
|
* must have consumed the complete packet.
|
|
* Otherwise, drop it. */
|
|
if (!n->mergeable_rx_bufs && offset < size) {
|
|
#if 0
|
|
error_report("virtio-net truncated non-mergeable packet: "
|
|
"i %zd mergeable %d offset %zd, size %zd, "
|
|
"guest hdr len %zd, host hdr len %zd",
|
|
i, n->mergeable_rx_bufs,
|
|
offset, size, guest_hdr_len, host_hdr_len);
|
|
#endif
|
|
return size;
|
|
}
|
|
|
|
/* signal other side */
|
|
virtqueue_fill(n->rx_vq, &elem, total, i++);
|
|
}
|
|
|
|
if (mhdr)
|
|
mhdr->num_buffers = i;
|
|
|
|
virtqueue_flush(n->rx_vq, i);
|
|
virtio_notify(&n->vdev, n->rx_vq);
|
|
|
|
return size;
|
|
}
|
|
|
|
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
|
|
|
|
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len)
|
|
{
|
|
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
|
|
|
|
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len);
|
|
virtio_notify(&n->vdev, n->tx_vq);
|
|
|
|
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
|
|
|
virtio_queue_set_notification(n->tx_vq, 1);
|
|
virtio_net_flush_tx(n, n->tx_vq);
|
|
}
|
|
|
|
/* TX */
|
|
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
|
|
{
|
|
VirtQueueElement elem;
|
|
int32_t num_packets = 0;
|
|
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return num_packets;
|
|
}
|
|
|
|
assert(n->vm_running);
|
|
|
|
if (n->async_tx.elem.out_num) {
|
|
virtio_queue_set_notification(n->tx_vq, 0);
|
|
return num_packets;
|
|
}
|
|
|
|
while (virtqueue_pop(vq, &elem)) {
|
|
ssize_t ret, len = 0;
|
|
unsigned int out_num = elem.out_num;
|
|
struct iovec *out_sg = &elem.out_sg[0];
|
|
unsigned hdr_len;
|
|
|
|
/* hdr_len refers to the header received from the guest */
|
|
hdr_len = n->mergeable_rx_bufs ?
|
|
sizeof(struct virtio_net_hdr_mrg_rxbuf) :
|
|
sizeof(struct virtio_net_hdr);
|
|
|
|
if (out_num < 1 || out_sg->iov_len != hdr_len) {
|
|
error_report("virtio-net header not in first element");
|
|
exit(1);
|
|
}
|
|
|
|
/* ignore the header if GSO is not supported */
|
|
if (!n->has_vnet_hdr) {
|
|
out_num--;
|
|
out_sg++;
|
|
len += hdr_len;
|
|
} else if (n->mergeable_rx_bufs) {
|
|
/* tapfd expects a struct virtio_net_hdr */
|
|
hdr_len -= sizeof(struct virtio_net_hdr);
|
|
out_sg->iov_len -= hdr_len;
|
|
len += hdr_len;
|
|
}
|
|
|
|
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num,
|
|
virtio_net_tx_complete);
|
|
if (ret == 0) {
|
|
virtio_queue_set_notification(n->tx_vq, 0);
|
|
n->async_tx.elem = elem;
|
|
n->async_tx.len = len;
|
|
return -EBUSY;
|
|
}
|
|
|
|
len += ret;
|
|
|
|
virtqueue_push(vq, &elem, len);
|
|
virtio_notify(&n->vdev, vq);
|
|
|
|
if (++num_packets >= n->tx_burst) {
|
|
break;
|
|
}
|
|
}
|
|
return num_packets;
|
|
}
|
|
|
|
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = to_virtio_net(vdev);
|
|
|
|
/* This happens when device was stopped but VCPU wasn't. */
|
|
if (!n->vm_running) {
|
|
n->tx_waiting = 1;
|
|
return;
|
|
}
|
|
|
|
if (n->tx_waiting) {
|
|
virtio_queue_set_notification(vq, 1);
|
|
qemu_del_timer(n->tx_timer);
|
|
n->tx_waiting = 0;
|
|
virtio_net_flush_tx(n, vq);
|
|
} else {
|
|
qemu_mod_timer(n->tx_timer,
|
|
qemu_get_clock(vm_clock) + n->tx_timeout);
|
|
n->tx_waiting = 1;
|
|
virtio_queue_set_notification(vq, 0);
|
|
}
|
|
}
|
|
|
|
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = to_virtio_net(vdev);
|
|
|
|
if (unlikely(n->tx_waiting)) {
|
|
return;
|
|
}
|
|
n->tx_waiting = 1;
|
|
/* This happens when device was stopped but VCPU wasn't. */
|
|
if (!n->vm_running) {
|
|
return;
|
|
}
|
|
virtio_queue_set_notification(vq, 0);
|
|
qemu_bh_schedule(n->tx_bh);
|
|
}
|
|
|
|
static void virtio_net_tx_timer(void *opaque)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
assert(n->vm_running);
|
|
|
|
n->tx_waiting = 0;
|
|
|
|
/* Just in case the driver is not ready on more */
|
|
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
return;
|
|
|
|
virtio_queue_set_notification(n->tx_vq, 1);
|
|
virtio_net_flush_tx(n, n->tx_vq);
|
|
}
|
|
|
|
static void virtio_net_tx_bh(void *opaque)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
int32_t ret;
|
|
|
|
assert(n->vm_running);
|
|
|
|
n->tx_waiting = 0;
|
|
|
|
/* Just in case the driver is not ready on more */
|
|
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
|
return;
|
|
|
|
ret = virtio_net_flush_tx(n, n->tx_vq);
|
|
if (ret == -EBUSY) {
|
|
return; /* Notification re-enable handled by tx_complete */
|
|
}
|
|
|
|
/* If we flush a full burst of packets, assume there are
|
|
* more coming and immediately reschedule */
|
|
if (ret >= n->tx_burst) {
|
|
qemu_bh_schedule(n->tx_bh);
|
|
n->tx_waiting = 1;
|
|
return;
|
|
}
|
|
|
|
/* If less than a full burst, re-enable notification and flush
|
|
* anything that may have come in while we weren't looking. If
|
|
* we find something, assume the guest is still active and reschedule */
|
|
virtio_queue_set_notification(n->tx_vq, 1);
|
|
if (virtio_net_flush_tx(n, n->tx_vq) > 0) {
|
|
virtio_queue_set_notification(n->tx_vq, 0);
|
|
qemu_bh_schedule(n->tx_bh);
|
|
n->tx_waiting = 1;
|
|
}
|
|
}
|
|
|
|
static void virtio_net_save(QEMUFile *f, void *opaque)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
|
|
/* At this point, backend must be stopped, otherwise
|
|
* it might keep writing to memory. */
|
|
assert(!n->vhost_started);
|
|
virtio_save(&n->vdev, f);
|
|
|
|
qemu_put_buffer(f, n->mac, ETH_ALEN);
|
|
qemu_put_be32(f, n->tx_waiting);
|
|
qemu_put_be32(f, n->mergeable_rx_bufs);
|
|
qemu_put_be16(f, n->status);
|
|
qemu_put_byte(f, n->promisc);
|
|
qemu_put_byte(f, n->allmulti);
|
|
qemu_put_be32(f, n->mac_table.in_use);
|
|
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
|
|
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
|
qemu_put_be32(f, n->has_vnet_hdr);
|
|
qemu_put_byte(f, n->mac_table.multi_overflow);
|
|
qemu_put_byte(f, n->mac_table.uni_overflow);
|
|
qemu_put_byte(f, n->alluni);
|
|
qemu_put_byte(f, n->nomulti);
|
|
qemu_put_byte(f, n->nouni);
|
|
qemu_put_byte(f, n->nobcast);
|
|
qemu_put_byte(f, n->has_ufo);
|
|
}
|
|
|
|
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
int i;
|
|
|
|
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
|
|
return -EINVAL;
|
|
|
|
virtio_load(&n->vdev, f);
|
|
|
|
qemu_get_buffer(f, n->mac, ETH_ALEN);
|
|
n->tx_waiting = qemu_get_be32(f);
|
|
n->mergeable_rx_bufs = qemu_get_be32(f);
|
|
|
|
if (version_id >= 3)
|
|
n->status = qemu_get_be16(f);
|
|
|
|
if (version_id >= 4) {
|
|
if (version_id < 8) {
|
|
n->promisc = qemu_get_be32(f);
|
|
n->allmulti = qemu_get_be32(f);
|
|
} else {
|
|
n->promisc = qemu_get_byte(f);
|
|
n->allmulti = qemu_get_byte(f);
|
|
}
|
|
}
|
|
|
|
if (version_id >= 5) {
|
|
n->mac_table.in_use = qemu_get_be32(f);
|
|
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
|
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
|
qemu_get_buffer(f, n->mac_table.macs,
|
|
n->mac_table.in_use * ETH_ALEN);
|
|
} else if (n->mac_table.in_use) {
|
|
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
|
|
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
|
n->mac_table.in_use = 0;
|
|
}
|
|
}
|
|
|
|
if (version_id >= 6)
|
|
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
|
|
|
if (version_id >= 7) {
|
|
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
|
error_report("virtio-net: saved image requires vnet_hdr=on");
|
|
return -1;
|
|
}
|
|
|
|
if (n->has_vnet_hdr) {
|
|
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
|
tap_set_offload(n->nic->nc.peer,
|
|
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
|
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
|
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
|
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
|
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
|
}
|
|
}
|
|
|
|
if (version_id >= 9) {
|
|
n->mac_table.multi_overflow = qemu_get_byte(f);
|
|
n->mac_table.uni_overflow = qemu_get_byte(f);
|
|
}
|
|
|
|
if (version_id >= 10) {
|
|
n->alluni = qemu_get_byte(f);
|
|
n->nomulti = qemu_get_byte(f);
|
|
n->nouni = qemu_get_byte(f);
|
|
n->nobcast = qemu_get_byte(f);
|
|
}
|
|
|
|
if (version_id >= 11) {
|
|
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
|
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Find the first multicast entry in the saved MAC filter */
|
|
for (i = 0; i < n->mac_table.in_use; i++) {
|
|
if (n->mac_table.macs[i * ETH_ALEN] & 1) {
|
|
break;
|
|
}
|
|
}
|
|
n->mac_table.first_multi = i;
|
|
return 0;
|
|
}
|
|
|
|
static void virtio_net_cleanup(VLANClientState *nc)
|
|
{
|
|
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
|
|
|
|
n->nic = NULL;
|
|
}
|
|
|
|
static NetClientInfo net_virtio_info = {
|
|
.type = NET_CLIENT_TYPE_NIC,
|
|
.size = sizeof(NICState),
|
|
.can_receive = virtio_net_can_receive,
|
|
.receive = virtio_net_receive,
|
|
.cleanup = virtio_net_cleanup,
|
|
.link_status_changed = virtio_net_set_link_status,
|
|
};
|
|
|
|
static void virtio_net_vmstate_change(void *opaque, int running, int reason)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
n->vm_running = running;
|
|
/* This is called when vm is started/stopped,
|
|
* it will start/stop vhost backend if appropriate
|
|
* e.g. after migration. */
|
|
virtio_net_set_status(&n->vdev, n->vdev.status);
|
|
}
|
|
|
|
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
|
|
virtio_net_conf *net)
|
|
{
|
|
VirtIONet *n;
|
|
|
|
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
|
sizeof(struct virtio_net_config),
|
|
sizeof(VirtIONet));
|
|
|
|
n->vdev.get_config = virtio_net_get_config;
|
|
n->vdev.set_config = virtio_net_set_config;
|
|
n->vdev.get_features = virtio_net_get_features;
|
|
n->vdev.set_features = virtio_net_set_features;
|
|
n->vdev.bad_features = virtio_net_bad_features;
|
|
n->vdev.reset = virtio_net_reset;
|
|
n->vdev.set_status = virtio_net_set_status;
|
|
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
|
|
|
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) {
|
|
error_report("virtio-net: "
|
|
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
|
net->tx);
|
|
error_report("Defaulting to \"bh\"");
|
|
}
|
|
|
|
if (net->tx && !strcmp(net->tx, "timer")) {
|
|
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
|
|
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
|
|
n->tx_timeout = net->txtimer;
|
|
} else {
|
|
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
|
|
n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n);
|
|
}
|
|
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
|
qemu_macaddr_default_if_unset(&conf->macaddr);
|
|
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac));
|
|
n->status = VIRTIO_NET_S_LINK_UP;
|
|
|
|
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n);
|
|
|
|
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a);
|
|
|
|
n->tx_waiting = 0;
|
|
n->tx_burst = net->txburst;
|
|
n->mergeable_rx_bufs = 0;
|
|
n->promisc = 1; /* for compatibility */
|
|
|
|
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
|
|
|
|
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
|
|
|
n->qdev = dev;
|
|
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
|
|
virtio_net_save, virtio_net_load, n);
|
|
n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n);
|
|
|
|
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
|
|
|
|
return &n->vdev;
|
|
}
|
|
|
|
void virtio_net_exit(VirtIODevice *vdev)
|
|
{
|
|
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev);
|
|
qemu_del_vm_change_state_handler(n->vmstate);
|
|
|
|
/* This will stop vhost backend if appropriate. */
|
|
virtio_net_set_status(vdev, 0);
|
|
|
|
qemu_purge_queued_packets(&n->nic->nc);
|
|
|
|
unregister_savevm(n->qdev, "virtio-net", n);
|
|
|
|
qemu_free(n->mac_table.macs);
|
|
qemu_free(n->vlans);
|
|
|
|
if (n->tx_timer) {
|
|
qemu_del_timer(n->tx_timer);
|
|
qemu_free_timer(n->tx_timer);
|
|
} else {
|
|
qemu_bh_delete(n->tx_bh);
|
|
}
|
|
|
|
virtio_cleanup(&n->vdev);
|
|
qemu_del_vlan_client(&n->nic->nc);
|
|
}
|