root / hw / virtio-net.c @ 1de7afc9
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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 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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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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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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struct {
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int in_use;
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int first_multi;
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uint8_t multi_overflow; |
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uint8_t uni_overflow; |
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uint8_t *macs; |
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} mac_table; |
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uint32_t *vlans; |
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DeviceState *qdev; |
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} VirtIONet; |
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|
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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static VirtIONet *to_virtio_net(VirtIODevice *vdev)
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{ |
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return (VirtIONet *)vdev;
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} |
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static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
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{ |
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VirtIONet *n = to_virtio_net(vdev); |
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struct virtio_net_config netcfg;
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stw_p(&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->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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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_OPTIONS_KIND_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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!n->nic->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(n->nic->nc.peer), &n->vdev)) {
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return;
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} |
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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_ns(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(NetClientState *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 void peer_test_vnet_hdr(VirtIONet *n) |
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{ |
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if (!n->nic->nc.peer)
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return;
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if (n->nic->nc.peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP)
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return;
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n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->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(n->nic->nc.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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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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if (peer_has_vnet_hdr(n) &&
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tap_has_vnet_hdr_len(n->nic->nc.peer, n->guest_hdr_len)) { |
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tap_set_vnet_hdr_len(n->nic->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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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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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_OPTIONS_KIND_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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virtio_net_set_mrg_rx_bufs(n, !!(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_OPTIONS_KIND_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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|
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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_p(elem->out_sg[1].iov_base);
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|
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if (sizeof(mac_data.entries) + |
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(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
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return VIRTIO_NET_ERR;
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|
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if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
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memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), |
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mac_data.entries * ETH_ALEN); |
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n->mac_table.in_use += mac_data.entries; |
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} else {
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n->mac_table.uni_overflow = 1;
|
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} |
376 |
|
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n->mac_table.first_multi = n->mac_table.in_use; |
378 |
|
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mac_data.entries = ldl_p(elem->out_sg[2].iov_base);
|
380 |
|
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if (sizeof(mac_data.entries) + |
382 |
(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
|
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return VIRTIO_NET_ERR;
|
384 |
|
385 |
if (mac_data.entries) {
|
386 |
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); |
390 |
n->mac_table.in_use += mac_data.entries; |
391 |
} else {
|
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n->mac_table.multi_overflow = 1;
|
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} |
394 |
} |
395 |
|
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return VIRTIO_NET_OK;
|
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} |
398 |
|
399 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
400 |
VirtQueueElement *elem) |
401 |
{ |
402 |
uint16_t vid; |
403 |
|
404 |
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
405 |
error_report("virtio-net ctrl invalid vlan command");
|
406 |
return VIRTIO_NET_ERR;
|
407 |
} |
408 |
|
409 |
vid = lduw_p(elem->out_sg[1].iov_base);
|
410 |
|
411 |
if (vid >= MAX_VLAN)
|
412 |
return VIRTIO_NET_ERR;
|
413 |
|
414 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
415 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
416 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
417 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
418 |
else
|
419 |
return VIRTIO_NET_ERR;
|
420 |
|
421 |
return VIRTIO_NET_OK;
|
422 |
} |
423 |
|
424 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
425 |
{ |
426 |
VirtIONet *n = to_virtio_net(vdev); |
427 |
struct virtio_net_ctrl_hdr ctrl;
|
428 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
429 |
VirtQueueElement elem; |
430 |
|
431 |
while (virtqueue_pop(vq, &elem)) {
|
432 |
if ((elem.in_num < 1) || (elem.out_num < 1)) { |
433 |
error_report("virtio-net ctrl missing headers");
|
434 |
exit(1);
|
435 |
} |
436 |
|
437 |
if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
438 |
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
439 |
error_report("virtio-net ctrl header not in correct element");
|
440 |
exit(1);
|
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} |
442 |
|
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ctrl.class = ldub_p(elem.out_sg[0].iov_base);
|
444 |
ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
445 |
|
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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); |
448 |
else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
449 |
status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
450 |
else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
451 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
452 |
|
453 |
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
|
454 |
|
455 |
virtqueue_push(vq, &elem, sizeof(status));
|
456 |
virtio_notify(vdev, vq); |
457 |
} |
458 |
} |
459 |
|
460 |
/* RX */
|
461 |
|
462 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
463 |
{ |
464 |
VirtIONet *n = to_virtio_net(vdev); |
465 |
|
466 |
qemu_flush_queued_packets(&n->nic->nc); |
467 |
} |
468 |
|
469 |
static int virtio_net_can_receive(NetClientState *nc) |
470 |
{ |
471 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
472 |
if (!n->vdev.vm_running) {
|
473 |
return 0; |
474 |
} |
475 |
|
476 |
if (!virtio_queue_ready(n->rx_vq) ||
|
477 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
478 |
return 0; |
479 |
|
480 |
return 1; |
481 |
} |
482 |
|
483 |
static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
484 |
{ |
485 |
if (virtio_queue_empty(n->rx_vq) ||
|
486 |
(n->mergeable_rx_bufs && |
487 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
|
488 |
virtio_queue_set_notification(n->rx_vq, 1);
|
489 |
|
490 |
/* To avoid a race condition where the guest has made some buffers
|
491 |
* available after the above check but before notification was
|
492 |
* enabled, check for available buffers again.
|
493 |
*/
|
494 |
if (virtio_queue_empty(n->rx_vq) ||
|
495 |
(n->mergeable_rx_bufs && |
496 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
|
497 |
return 0; |
498 |
} |
499 |
|
500 |
virtio_queue_set_notification(n->rx_vq, 0);
|
501 |
return 1; |
502 |
} |
503 |
|
504 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
505 |
* it never finds out that the packets don't have valid checksums. This
|
506 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
507 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
508 |
* dhclient yet.
|
509 |
*
|
510 |
* To avoid breaking existing guests, we catch udp packets and add
|
511 |
* checksums. This is terrible but it's better than hacking the guest
|
512 |
* kernels.
|
513 |
*
|
514 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
515 |
* we should provide a mechanism to disable it to avoid polluting the host
|
516 |
* cache.
|
517 |
*/
|
518 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
519 |
uint8_t *buf, size_t size) |
520 |
{ |
521 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
522 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
523 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
524 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
525 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
526 |
net_checksum_calculate(buf, size); |
527 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
528 |
} |
529 |
} |
530 |
|
531 |
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, |
532 |
const void *buf, size_t size) |
533 |
{ |
534 |
if (n->has_vnet_hdr) {
|
535 |
/* FIXME this cast is evil */
|
536 |
void *wbuf = (void *)buf; |
537 |
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, |
538 |
size - n->host_hdr_len); |
539 |
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); |
540 |
} else {
|
541 |
struct virtio_net_hdr hdr = {
|
542 |
.flags = 0,
|
543 |
.gso_type = VIRTIO_NET_HDR_GSO_NONE |
544 |
}; |
545 |
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); |
546 |
} |
547 |
} |
548 |
|
549 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
550 |
{ |
551 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
552 |
static const uint8_t vlan[] = {0x81, 0x00}; |
553 |
uint8_t *ptr = (uint8_t *)buf; |
554 |
int i;
|
555 |
|
556 |
if (n->promisc)
|
557 |
return 1; |
558 |
|
559 |
ptr += n->host_hdr_len; |
560 |
|
561 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
562 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
563 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
564 |
return 0; |
565 |
} |
566 |
|
567 |
if (ptr[0] & 1) { // multicast |
568 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
569 |
return !n->nobcast;
|
570 |
} else if (n->nomulti) { |
571 |
return 0; |
572 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
573 |
return 1; |
574 |
} |
575 |
|
576 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
577 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
578 |
return 1; |
579 |
} |
580 |
} |
581 |
} else { // unicast |
582 |
if (n->nouni) {
|
583 |
return 0; |
584 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
585 |
return 1; |
586 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
587 |
return 1; |
588 |
} |
589 |
|
590 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
591 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
592 |
return 1; |
593 |
} |
594 |
} |
595 |
} |
596 |
|
597 |
return 0; |
598 |
} |
599 |
|
600 |
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
601 |
{ |
602 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
603 |
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
|
604 |
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
605 |
unsigned mhdr_cnt = 0; |
606 |
size_t offset, i, guest_offset; |
607 |
|
608 |
if (!virtio_net_can_receive(&n->nic->nc))
|
609 |
return -1; |
610 |
|
611 |
/* hdr_len refers to the header we supply to the guest */
|
612 |
if (!virtio_net_has_buffers(n, size + n->guest_hdr_len - n->host_hdr_len))
|
613 |
return 0; |
614 |
|
615 |
if (!receive_filter(n, buf, size))
|
616 |
return size;
|
617 |
|
618 |
offset = i = 0;
|
619 |
|
620 |
while (offset < size) {
|
621 |
VirtQueueElement elem; |
622 |
int len, total;
|
623 |
const struct iovec *sg = elem.in_sg; |
624 |
|
625 |
total = 0;
|
626 |
|
627 |
if (virtqueue_pop(n->rx_vq, &elem) == 0) { |
628 |
if (i == 0) |
629 |
return -1; |
630 |
error_report("virtio-net unexpected empty queue: "
|
631 |
"i %zd mergeable %d offset %zd, size %zd, "
|
632 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
|
633 |
i, n->mergeable_rx_bufs, offset, size, |
634 |
n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); |
635 |
exit(1);
|
636 |
} |
637 |
|
638 |
if (elem.in_num < 1) { |
639 |
error_report("virtio-net receive queue contains no in buffers");
|
640 |
exit(1);
|
641 |
} |
642 |
|
643 |
if (i == 0) { |
644 |
assert(offset == 0);
|
645 |
if (n->mergeable_rx_bufs) {
|
646 |
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), |
647 |
sg, elem.in_num, |
648 |
offsetof(typeof(mhdr), num_buffers), |
649 |
sizeof(mhdr.num_buffers));
|
650 |
} |
651 |
|
652 |
receive_header(n, sg, elem.in_num, buf, size); |
653 |
offset = n->host_hdr_len; |
654 |
total += n->guest_hdr_len; |
655 |
guest_offset = n->guest_hdr_len; |
656 |
} else {
|
657 |
guest_offset = 0;
|
658 |
} |
659 |
|
660 |
/* copy in packet. ugh */
|
661 |
len = iov_from_buf(sg, elem.in_num, guest_offset, |
662 |
buf + offset, size - offset); |
663 |
total += len; |
664 |
offset += len; |
665 |
/* If buffers can't be merged, at this point we
|
666 |
* must have consumed the complete packet.
|
667 |
* Otherwise, drop it. */
|
668 |
if (!n->mergeable_rx_bufs && offset < size) {
|
669 |
#if 0
|
670 |
error_report("virtio-net truncated non-mergeable packet: "
|
671 |
"i %zd mergeable %d offset %zd, size %zd, "
|
672 |
"guest hdr len %zd, host hdr len %zd",
|
673 |
i, n->mergeable_rx_bufs,
|
674 |
offset, size, n->guest_hdr_len, n->host_hdr_len);
|
675 |
#endif
|
676 |
return size;
|
677 |
} |
678 |
|
679 |
/* signal other side */
|
680 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
681 |
} |
682 |
|
683 |
if (mhdr_cnt) {
|
684 |
stw_p(&mhdr.num_buffers, i); |
685 |
iov_from_buf(mhdr_sg, mhdr_cnt, |
686 |
0,
|
687 |
&mhdr.num_buffers, sizeof mhdr.num_buffers);
|
688 |
} |
689 |
|
690 |
virtqueue_flush(n->rx_vq, i); |
691 |
virtio_notify(&n->vdev, n->rx_vq); |
692 |
|
693 |
return size;
|
694 |
} |
695 |
|
696 |
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
|
697 |
|
698 |
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) |
699 |
{ |
700 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
701 |
|
702 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, 0);
|
703 |
virtio_notify(&n->vdev, n->tx_vq); |
704 |
|
705 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
706 |
|
707 |
virtio_queue_set_notification(n->tx_vq, 1);
|
708 |
virtio_net_flush_tx(n, n->tx_vq); |
709 |
} |
710 |
|
711 |
/* TX */
|
712 |
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
|
713 |
{ |
714 |
VirtQueueElement elem; |
715 |
int32_t num_packets = 0;
|
716 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
717 |
return num_packets;
|
718 |
} |
719 |
|
720 |
assert(n->vdev.vm_running); |
721 |
|
722 |
if (n->async_tx.elem.out_num) {
|
723 |
virtio_queue_set_notification(n->tx_vq, 0);
|
724 |
return num_packets;
|
725 |
} |
726 |
|
727 |
while (virtqueue_pop(vq, &elem)) {
|
728 |
ssize_t ret, len; |
729 |
unsigned int out_num = elem.out_num; |
730 |
struct iovec *out_sg = &elem.out_sg[0]; |
731 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
732 |
|
733 |
if (out_num < 1) { |
734 |
error_report("virtio-net header not in first element");
|
735 |
exit(1);
|
736 |
} |
737 |
|
738 |
/*
|
739 |
* If host wants to see the guest header as is, we can
|
740 |
* pass it on unchanged. Otherwise, copy just the parts
|
741 |
* that host is interested in.
|
742 |
*/
|
743 |
assert(n->host_hdr_len <= n->guest_hdr_len); |
744 |
if (n->host_hdr_len != n->guest_hdr_len) {
|
745 |
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
|
746 |
out_sg, out_num, |
747 |
0, n->host_hdr_len);
|
748 |
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, |
749 |
out_sg, out_num, |
750 |
n->guest_hdr_len, -1);
|
751 |
out_num = sg_num; |
752 |
out_sg = sg; |
753 |
} |
754 |
|
755 |
len = n->guest_hdr_len; |
756 |
|
757 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
758 |
virtio_net_tx_complete); |
759 |
if (ret == 0) { |
760 |
virtio_queue_set_notification(n->tx_vq, 0);
|
761 |
n->async_tx.elem = elem; |
762 |
n->async_tx.len = len; |
763 |
return -EBUSY;
|
764 |
} |
765 |
|
766 |
len += ret; |
767 |
|
768 |
virtqueue_push(vq, &elem, 0);
|
769 |
virtio_notify(&n->vdev, vq); |
770 |
|
771 |
if (++num_packets >= n->tx_burst) {
|
772 |
break;
|
773 |
} |
774 |
} |
775 |
return num_packets;
|
776 |
} |
777 |
|
778 |
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) |
779 |
{ |
780 |
VirtIONet *n = to_virtio_net(vdev); |
781 |
|
782 |
/* This happens when device was stopped but VCPU wasn't. */
|
783 |
if (!n->vdev.vm_running) {
|
784 |
n->tx_waiting = 1;
|
785 |
return;
|
786 |
} |
787 |
|
788 |
if (n->tx_waiting) {
|
789 |
virtio_queue_set_notification(vq, 1);
|
790 |
qemu_del_timer(n->tx_timer); |
791 |
n->tx_waiting = 0;
|
792 |
virtio_net_flush_tx(n, vq); |
793 |
} else {
|
794 |
qemu_mod_timer(n->tx_timer, |
795 |
qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
796 |
n->tx_waiting = 1;
|
797 |
virtio_queue_set_notification(vq, 0);
|
798 |
} |
799 |
} |
800 |
|
801 |
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) |
802 |
{ |
803 |
VirtIONet *n = to_virtio_net(vdev); |
804 |
|
805 |
if (unlikely(n->tx_waiting)) {
|
806 |
return;
|
807 |
} |
808 |
n->tx_waiting = 1;
|
809 |
/* This happens when device was stopped but VCPU wasn't. */
|
810 |
if (!n->vdev.vm_running) {
|
811 |
return;
|
812 |
} |
813 |
virtio_queue_set_notification(vq, 0);
|
814 |
qemu_bh_schedule(n->tx_bh); |
815 |
} |
816 |
|
817 |
static void virtio_net_tx_timer(void *opaque) |
818 |
{ |
819 |
VirtIONet *n = opaque; |
820 |
assert(n->vdev.vm_running); |
821 |
|
822 |
n->tx_waiting = 0;
|
823 |
|
824 |
/* Just in case the driver is not ready on more */
|
825 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
826 |
return;
|
827 |
|
828 |
virtio_queue_set_notification(n->tx_vq, 1);
|
829 |
virtio_net_flush_tx(n, n->tx_vq); |
830 |
} |
831 |
|
832 |
static void virtio_net_tx_bh(void *opaque) |
833 |
{ |
834 |
VirtIONet *n = opaque; |
835 |
int32_t ret; |
836 |
|
837 |
assert(n->vdev.vm_running); |
838 |
|
839 |
n->tx_waiting = 0;
|
840 |
|
841 |
/* Just in case the driver is not ready on more */
|
842 |
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
843 |
return;
|
844 |
|
845 |
ret = virtio_net_flush_tx(n, n->tx_vq); |
846 |
if (ret == -EBUSY) {
|
847 |
return; /* Notification re-enable handled by tx_complete */ |
848 |
} |
849 |
|
850 |
/* If we flush a full burst of packets, assume there are
|
851 |
* more coming and immediately reschedule */
|
852 |
if (ret >= n->tx_burst) {
|
853 |
qemu_bh_schedule(n->tx_bh); |
854 |
n->tx_waiting = 1;
|
855 |
return;
|
856 |
} |
857 |
|
858 |
/* If less than a full burst, re-enable notification and flush
|
859 |
* anything that may have come in while we weren't looking. If
|
860 |
* we find something, assume the guest is still active and reschedule */
|
861 |
virtio_queue_set_notification(n->tx_vq, 1);
|
862 |
if (virtio_net_flush_tx(n, n->tx_vq) > 0) { |
863 |
virtio_queue_set_notification(n->tx_vq, 0);
|
864 |
qemu_bh_schedule(n->tx_bh); |
865 |
n->tx_waiting = 1;
|
866 |
} |
867 |
} |
868 |
|
869 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
870 |
{ |
871 |
VirtIONet *n = opaque; |
872 |
|
873 |
/* At this point, backend must be stopped, otherwise
|
874 |
* it might keep writing to memory. */
|
875 |
assert(!n->vhost_started); |
876 |
virtio_save(&n->vdev, f); |
877 |
|
878 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
879 |
qemu_put_be32(f, n->tx_waiting); |
880 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
881 |
qemu_put_be16(f, n->status); |
882 |
qemu_put_byte(f, n->promisc); |
883 |
qemu_put_byte(f, n->allmulti); |
884 |
qemu_put_be32(f, n->mac_table.in_use); |
885 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
886 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
887 |
qemu_put_be32(f, n->has_vnet_hdr); |
888 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
889 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
890 |
qemu_put_byte(f, n->alluni); |
891 |
qemu_put_byte(f, n->nomulti); |
892 |
qemu_put_byte(f, n->nouni); |
893 |
qemu_put_byte(f, n->nobcast); |
894 |
qemu_put_byte(f, n->has_ufo); |
895 |
} |
896 |
|
897 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
898 |
{ |
899 |
VirtIONet *n = opaque; |
900 |
int i;
|
901 |
int ret;
|
902 |
|
903 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
904 |
return -EINVAL;
|
905 |
|
906 |
ret = virtio_load(&n->vdev, f); |
907 |
if (ret) {
|
908 |
return ret;
|
909 |
} |
910 |
|
911 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
912 |
n->tx_waiting = qemu_get_be32(f); |
913 |
|
914 |
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); |
915 |
|
916 |
if (version_id >= 3) |
917 |
n->status = qemu_get_be16(f); |
918 |
|
919 |
if (version_id >= 4) { |
920 |
if (version_id < 8) { |
921 |
n->promisc = qemu_get_be32(f); |
922 |
n->allmulti = qemu_get_be32(f); |
923 |
} else {
|
924 |
n->promisc = qemu_get_byte(f); |
925 |
n->allmulti = qemu_get_byte(f); |
926 |
} |
927 |
} |
928 |
|
929 |
if (version_id >= 5) { |
930 |
n->mac_table.in_use = qemu_get_be32(f); |
931 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
932 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
933 |
qemu_get_buffer(f, n->mac_table.macs, |
934 |
n->mac_table.in_use * ETH_ALEN); |
935 |
} else if (n->mac_table.in_use) { |
936 |
uint8_t *buf = g_malloc0(n->mac_table.in_use); |
937 |
qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); |
938 |
g_free(buf); |
939 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
940 |
n->mac_table.in_use = 0;
|
941 |
} |
942 |
} |
943 |
|
944 |
if (version_id >= 6) |
945 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
946 |
|
947 |
if (version_id >= 7) { |
948 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
949 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
950 |
return -1; |
951 |
} |
952 |
|
953 |
if (n->has_vnet_hdr) {
|
954 |
tap_set_offload(n->nic->nc.peer, |
955 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
956 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
957 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
958 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
959 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
960 |
} |
961 |
} |
962 |
|
963 |
if (version_id >= 9) { |
964 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
965 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
966 |
} |
967 |
|
968 |
if (version_id >= 10) { |
969 |
n->alluni = qemu_get_byte(f); |
970 |
n->nomulti = qemu_get_byte(f); |
971 |
n->nouni = qemu_get_byte(f); |
972 |
n->nobcast = qemu_get_byte(f); |
973 |
} |
974 |
|
975 |
if (version_id >= 11) { |
976 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
977 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
978 |
return -1; |
979 |
} |
980 |
} |
981 |
|
982 |
/* Find the first multicast entry in the saved MAC filter */
|
983 |
for (i = 0; i < n->mac_table.in_use; i++) { |
984 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
985 |
break;
|
986 |
} |
987 |
} |
988 |
n->mac_table.first_multi = i; |
989 |
|
990 |
/* nc.link_down can't be migrated, so infer link_down according
|
991 |
* to link status bit in n->status */
|
992 |
n->nic->nc.link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
|
993 |
|
994 |
return 0; |
995 |
} |
996 |
|
997 |
static void virtio_net_cleanup(NetClientState *nc) |
998 |
{ |
999 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
1000 |
|
1001 |
n->nic = NULL;
|
1002 |
} |
1003 |
|
1004 |
static NetClientInfo net_virtio_info = {
|
1005 |
.type = NET_CLIENT_OPTIONS_KIND_NIC, |
1006 |
.size = sizeof(NICState),
|
1007 |
.can_receive = virtio_net_can_receive, |
1008 |
.receive = virtio_net_receive, |
1009 |
.cleanup = virtio_net_cleanup, |
1010 |
.link_status_changed = virtio_net_set_link_status, |
1011 |
}; |
1012 |
|
1013 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, |
1014 |
virtio_net_conf *net) |
1015 |
{ |
1016 |
VirtIONet *n; |
1017 |
|
1018 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
1019 |
sizeof(struct virtio_net_config), |
1020 |
sizeof(VirtIONet));
|
1021 |
|
1022 |
n->vdev.get_config = virtio_net_get_config; |
1023 |
n->vdev.set_config = virtio_net_set_config; |
1024 |
n->vdev.get_features = virtio_net_get_features; |
1025 |
n->vdev.set_features = virtio_net_set_features; |
1026 |
n->vdev.bad_features = virtio_net_bad_features; |
1027 |
n->vdev.reset = virtio_net_reset; |
1028 |
n->vdev.set_status = virtio_net_set_status; |
1029 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
1030 |
|
1031 |
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { |
1032 |
error_report("virtio-net: "
|
1033 |
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
1034 |
net->tx); |
1035 |
error_report("Defaulting to \"bh\"");
|
1036 |
} |
1037 |
|
1038 |
if (net->tx && !strcmp(net->tx, "timer")) { |
1039 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
|
1040 |
n->tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, n); |
1041 |
n->tx_timeout = net->txtimer; |
1042 |
} else {
|
1043 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
|
1044 |
n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n); |
1045 |
} |
1046 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
1047 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
1048 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
1049 |
n->status = VIRTIO_NET_S_LINK_UP; |
1050 |
|
1051 |
n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); |
1052 |
peer_test_vnet_hdr(n); |
1053 |
if (peer_has_vnet_hdr(n)) {
|
1054 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
1055 |
n->host_hdr_len = sizeof(struct virtio_net_hdr); |
1056 |
} else {
|
1057 |
n->host_hdr_len = 0;
|
1058 |
} |
1059 |
|
1060 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
1061 |
|
1062 |
n->tx_waiting = 0;
|
1063 |
n->tx_burst = net->txburst; |
1064 |
virtio_net_set_mrg_rx_bufs(n, 0);
|
1065 |
n->promisc = 1; /* for compatibility */ |
1066 |
|
1067 |
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); |
1068 |
|
1069 |
n->vlans = g_malloc0(MAX_VLAN >> 3);
|
1070 |
|
1071 |
n->qdev = dev; |
1072 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
1073 |
virtio_net_save, virtio_net_load, n); |
1074 |
|
1075 |
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
|
1076 |
|
1077 |
return &n->vdev;
|
1078 |
} |
1079 |
|
1080 |
void virtio_net_exit(VirtIODevice *vdev)
|
1081 |
{ |
1082 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
1083 |
|
1084 |
/* This will stop vhost backend if appropriate. */
|
1085 |
virtio_net_set_status(vdev, 0);
|
1086 |
|
1087 |
qemu_purge_queued_packets(&n->nic->nc); |
1088 |
|
1089 |
unregister_savevm(n->qdev, "virtio-net", n);
|
1090 |
|
1091 |
g_free(n->mac_table.macs); |
1092 |
g_free(n->vlans); |
1093 |
|
1094 |
if (n->tx_timer) {
|
1095 |
qemu_del_timer(n->tx_timer); |
1096 |
qemu_free_timer(n->tx_timer); |
1097 |
} else {
|
1098 |
qemu_bh_delete(n->tx_bh); |
1099 |
} |
1100 |
|
1101 |
qemu_del_net_client(&n->nic->nc); |
1102 |
virtio_cleanup(&n->vdev); |
1103 |
} |