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/*
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* Virtio Network Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "iov.h" |
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#include "virtio.h" |
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#include "net.h" |
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#include "net/checksum.h" |
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#include "net/tap.h" |
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#include "qemu-error.h" |
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#include "qemu-timer.h" |
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#include "virtio-net.h" |
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#include "vhost_net.h" |
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#define VIRTIO_NET_VM_VERSION 11 |
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#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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int tx_timer_active;
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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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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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} 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 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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} |
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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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if (n->vhost_started) {
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vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
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n->vhost_started = 0;
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} |
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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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fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
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exit(1);
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} |
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on = ldub_p(elem->out_sg[1].iov_base);
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if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
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n->promisc = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) |
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n->allmulti = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI) |
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n->alluni = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI) |
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n->nomulti = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI) |
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n->nouni = on; |
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else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST) |
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n->nobcast = on; |
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else
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return VIRTIO_NET_ERR;
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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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fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
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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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fprintf(stderr, "virtio-net ctrl missing headers\n");
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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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fprintf(stderr, "virtio-net ctrl header not in correct element\n");
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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); |
373 |
} |
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} |
375 |
|
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/* RX */
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static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
379 |
{ |
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VirtIONet *n = to_virtio_net(vdev); |
381 |
|
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qemu_flush_queued_packets(&n->nic->nc); |
383 |
|
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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(); |
387 |
} |
388 |
|
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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; |
392 |
|
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if (!virtio_queue_ready(n->rx_vq) ||
|
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
395 |
return 0; |
396 |
|
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return 1; |
398 |
} |
399 |
|
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static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
401 |
{ |
402 |
if (virtio_queue_empty(n->rx_vq) ||
|
403 |
(n->mergeable_rx_bufs && |
404 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
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virtio_queue_set_notification(n->rx_vq, 1);
|
406 |
|
407 |
/* To avoid a race condition where the guest has made some buffers
|
408 |
* available after the above check but before notification was
|
409 |
* enabled, check for available buffers again.
|
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*/
|
411 |
if (virtio_queue_empty(n->rx_vq) ||
|
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(n->mergeable_rx_bufs && |
413 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
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return 0; |
415 |
} |
416 |
|
417 |
virtio_queue_set_notification(n->rx_vq, 0);
|
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return 1; |
419 |
} |
420 |
|
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/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
422 |
* it never finds out that the packets don't have valid checksums. This
|
423 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
424 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
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* dhclient yet.
|
426 |
*
|
427 |
* To avoid breaking existing guests, we catch udp packets and add
|
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* checksums. This is terrible but it's better than hacking the guest
|
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* kernels.
|
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*
|
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* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
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* we should provide a mechanism to disable it to avoid polluting the host
|
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* cache.
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*/
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static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
436 |
const uint8_t *buf, size_t size)
|
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{ |
438 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
439 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
440 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
441 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
442 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
443 |
/* FIXME this cast is evil */
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net_checksum_calculate((uint8_t *)buf, size); |
445 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
446 |
} |
447 |
} |
448 |
|
449 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
450 |
const void *buf, size_t size, size_t hdr_len) |
451 |
{ |
452 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
453 |
int offset = 0; |
454 |
|
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hdr->flags = 0;
|
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
457 |
|
458 |
if (n->has_vnet_hdr) {
|
459 |
memcpy(hdr, buf, sizeof(*hdr));
|
460 |
offset = sizeof(*hdr);
|
461 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
462 |
} |
463 |
|
464 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
465 |
* but we may be passing along a larger header to the guest.
|
466 |
*/
|
467 |
iov[0].iov_base += hdr_len;
|
468 |
iov[0].iov_len -= hdr_len;
|
469 |
|
470 |
return offset;
|
471 |
} |
472 |
|
473 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
474 |
{ |
475 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
476 |
static const uint8_t vlan[] = {0x81, 0x00}; |
477 |
uint8_t *ptr = (uint8_t *)buf; |
478 |
int i;
|
479 |
|
480 |
if (n->promisc)
|
481 |
return 1; |
482 |
|
483 |
if (n->has_vnet_hdr) {
|
484 |
ptr += sizeof(struct virtio_net_hdr); |
485 |
} |
486 |
|
487 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
488 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
489 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
490 |
return 0; |
491 |
} |
492 |
|
493 |
if (ptr[0] & 1) { // multicast |
494 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
495 |
return !n->nobcast;
|
496 |
} else if (n->nomulti) { |
497 |
return 0; |
498 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
499 |
return 1; |
500 |
} |
501 |
|
502 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
503 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
504 |
return 1; |
505 |
} |
506 |
} |
507 |
} else { // unicast |
508 |
if (n->nouni) {
|
509 |
return 0; |
510 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
511 |
return 1; |
512 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
513 |
return 1; |
514 |
} |
515 |
|
516 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
517 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
518 |
return 1; |
519 |
} |
520 |
} |
521 |
} |
522 |
|
523 |
return 0; |
524 |
} |
525 |
|
526 |
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
527 |
{ |
528 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
529 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
530 |
size_t hdr_len, offset, i; |
531 |
|
532 |
if (!virtio_net_can_receive(&n->nic->nc))
|
533 |
return -1; |
534 |
|
535 |
/* hdr_len refers to the header we supply to the guest */
|
536 |
hdr_len = n->mergeable_rx_bufs ? |
537 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
538 |
|
539 |
|
540 |
if (!virtio_net_has_buffers(n, size + hdr_len))
|
541 |
return 0; |
542 |
|
543 |
if (!receive_filter(n, buf, size))
|
544 |
return size;
|
545 |
|
546 |
offset = i = 0;
|
547 |
|
548 |
while (offset < size) {
|
549 |
VirtQueueElement elem; |
550 |
int len, total;
|
551 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
552 |
|
553 |
total = 0;
|
554 |
|
555 |
if ((i != 0 && !n->mergeable_rx_bufs) || |
556 |
virtqueue_pop(n->rx_vq, &elem) == 0) {
|
557 |
if (i == 0) |
558 |
return -1; |
559 |
fprintf(stderr, "virtio-net truncating packet: "
|
560 |
"offset %zd, size %zd, hdr_len %zd\n",
|
561 |
offset, size, hdr_len); |
562 |
exit(1);
|
563 |
} |
564 |
|
565 |
if (elem.in_num < 1) { |
566 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
567 |
exit(1);
|
568 |
} |
569 |
|
570 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { |
571 |
fprintf(stderr, "virtio-net header not in first element\n");
|
572 |
exit(1);
|
573 |
} |
574 |
|
575 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
576 |
|
577 |
if (i == 0) { |
578 |
if (n->mergeable_rx_bufs)
|
579 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
580 |
|
581 |
offset += receive_header(n, sg, elem.in_num, |
582 |
buf + offset, size - offset, hdr_len); |
583 |
total += hdr_len; |
584 |
} |
585 |
|
586 |
/* copy in packet. ugh */
|
587 |
len = iov_from_buf(sg, elem.in_num, |
588 |
buf + offset, size - offset); |
589 |
total += len; |
590 |
|
591 |
/* signal other side */
|
592 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
593 |
|
594 |
offset += len; |
595 |
} |
596 |
|
597 |
if (mhdr)
|
598 |
mhdr->num_buffers = i; |
599 |
|
600 |
virtqueue_flush(n->rx_vq, i); |
601 |
virtio_notify(&n->vdev, n->rx_vq); |
602 |
|
603 |
return size;
|
604 |
} |
605 |
|
606 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); |
607 |
|
608 |
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len) |
609 |
{ |
610 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
611 |
|
612 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
613 |
virtio_notify(&n->vdev, n->tx_vq); |
614 |
|
615 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
616 |
|
617 |
virtio_queue_set_notification(n->tx_vq, 1);
|
618 |
virtio_net_flush_tx(n, n->tx_vq); |
619 |
} |
620 |
|
621 |
/* TX */
|
622 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
623 |
{ |
624 |
VirtQueueElement elem; |
625 |
|
626 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
627 |
return;
|
628 |
|
629 |
if (n->async_tx.elem.out_num) {
|
630 |
virtio_queue_set_notification(n->tx_vq, 0);
|
631 |
return;
|
632 |
} |
633 |
|
634 |
while (virtqueue_pop(vq, &elem)) {
|
635 |
ssize_t ret, len = 0;
|
636 |
unsigned int out_num = elem.out_num; |
637 |
struct iovec *out_sg = &elem.out_sg[0]; |
638 |
unsigned hdr_len;
|
639 |
|
640 |
/* hdr_len refers to the header received from the guest */
|
641 |
hdr_len = n->mergeable_rx_bufs ? |
642 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
643 |
sizeof(struct virtio_net_hdr); |
644 |
|
645 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
646 |
fprintf(stderr, "virtio-net header not in first element\n");
|
647 |
exit(1);
|
648 |
} |
649 |
|
650 |
/* ignore the header if GSO is not supported */
|
651 |
if (!n->has_vnet_hdr) {
|
652 |
out_num--; |
653 |
out_sg++; |
654 |
len += hdr_len; |
655 |
} else if (n->mergeable_rx_bufs) { |
656 |
/* tapfd expects a struct virtio_net_hdr */
|
657 |
hdr_len -= sizeof(struct virtio_net_hdr); |
658 |
out_sg->iov_len -= hdr_len; |
659 |
len += hdr_len; |
660 |
} |
661 |
|
662 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
663 |
virtio_net_tx_complete); |
664 |
if (ret == 0) { |
665 |
virtio_queue_set_notification(n->tx_vq, 0);
|
666 |
n->async_tx.elem = elem; |
667 |
n->async_tx.len = len; |
668 |
return;
|
669 |
} |
670 |
|
671 |
len += ret; |
672 |
|
673 |
virtqueue_push(vq, &elem, len); |
674 |
virtio_notify(&n->vdev, vq); |
675 |
} |
676 |
} |
677 |
|
678 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
679 |
{ |
680 |
VirtIONet *n = to_virtio_net(vdev); |
681 |
|
682 |
if (n->tx_timer_active) {
|
683 |
virtio_queue_set_notification(vq, 1);
|
684 |
qemu_del_timer(n->tx_timer); |
685 |
n->tx_timer_active = 0;
|
686 |
virtio_net_flush_tx(n, vq); |
687 |
} else {
|
688 |
qemu_mod_timer(n->tx_timer, |
689 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
690 |
n->tx_timer_active = 1;
|
691 |
virtio_queue_set_notification(vq, 0);
|
692 |
} |
693 |
} |
694 |
|
695 |
static void virtio_net_tx_timer(void *opaque) |
696 |
{ |
697 |
VirtIONet *n = opaque; |
698 |
|
699 |
n->tx_timer_active = 0;
|
700 |
|
701 |
/* Just in case the driver is not ready on more */
|
702 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
703 |
return;
|
704 |
|
705 |
virtio_queue_set_notification(n->tx_vq, 1);
|
706 |
virtio_net_flush_tx(n, n->tx_vq); |
707 |
} |
708 |
|
709 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
710 |
{ |
711 |
VirtIONet *n = opaque; |
712 |
|
713 |
if (n->vhost_started) {
|
714 |
/* TODO: should we really stop the backend?
|
715 |
* If we don't, it might keep writing to memory. */
|
716 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); |
717 |
n->vhost_started = 0;
|
718 |
} |
719 |
virtio_save(&n->vdev, f); |
720 |
|
721 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
722 |
qemu_put_be32(f, n->tx_timer_active); |
723 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
724 |
qemu_put_be16(f, n->status); |
725 |
qemu_put_byte(f, n->promisc); |
726 |
qemu_put_byte(f, n->allmulti); |
727 |
qemu_put_be32(f, n->mac_table.in_use); |
728 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
729 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
730 |
qemu_put_be32(f, n->has_vnet_hdr); |
731 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
732 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
733 |
qemu_put_byte(f, n->alluni); |
734 |
qemu_put_byte(f, n->nomulti); |
735 |
qemu_put_byte(f, n->nouni); |
736 |
qemu_put_byte(f, n->nobcast); |
737 |
qemu_put_byte(f, n->has_ufo); |
738 |
} |
739 |
|
740 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
741 |
{ |
742 |
VirtIONet *n = opaque; |
743 |
int i;
|
744 |
|
745 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
746 |
return -EINVAL;
|
747 |
|
748 |
virtio_load(&n->vdev, f); |
749 |
|
750 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
751 |
n->tx_timer_active = qemu_get_be32(f); |
752 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
753 |
|
754 |
if (version_id >= 3) |
755 |
n->status = qemu_get_be16(f); |
756 |
|
757 |
if (version_id >= 4) { |
758 |
if (version_id < 8) { |
759 |
n->promisc = qemu_get_be32(f); |
760 |
n->allmulti = qemu_get_be32(f); |
761 |
} else {
|
762 |
n->promisc = qemu_get_byte(f); |
763 |
n->allmulti = qemu_get_byte(f); |
764 |
} |
765 |
} |
766 |
|
767 |
if (version_id >= 5) { |
768 |
n->mac_table.in_use = qemu_get_be32(f); |
769 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
770 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
771 |
qemu_get_buffer(f, n->mac_table.macs, |
772 |
n->mac_table.in_use * ETH_ALEN); |
773 |
} else if (n->mac_table.in_use) { |
774 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
775 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
776 |
n->mac_table.in_use = 0;
|
777 |
} |
778 |
} |
779 |
|
780 |
if (version_id >= 6) |
781 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
782 |
|
783 |
if (version_id >= 7) { |
784 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
785 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
786 |
return -1; |
787 |
} |
788 |
|
789 |
if (n->has_vnet_hdr) {
|
790 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
791 |
tap_set_offload(n->nic->nc.peer, |
792 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
793 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
794 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
795 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
796 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
797 |
} |
798 |
} |
799 |
|
800 |
if (version_id >= 9) { |
801 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
802 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
803 |
} |
804 |
|
805 |
if (version_id >= 10) { |
806 |
n->alluni = qemu_get_byte(f); |
807 |
n->nomulti = qemu_get_byte(f); |
808 |
n->nouni = qemu_get_byte(f); |
809 |
n->nobcast = qemu_get_byte(f); |
810 |
} |
811 |
|
812 |
if (version_id >= 11) { |
813 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
814 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
815 |
return -1; |
816 |
} |
817 |
} |
818 |
|
819 |
/* Find the first multicast entry in the saved MAC filter */
|
820 |
for (i = 0; i < n->mac_table.in_use; i++) { |
821 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
822 |
break;
|
823 |
} |
824 |
} |
825 |
n->mac_table.first_multi = i; |
826 |
|
827 |
if (n->tx_timer_active) {
|
828 |
qemu_mod_timer(n->tx_timer, |
829 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
830 |
} |
831 |
return 0; |
832 |
} |
833 |
|
834 |
static void virtio_net_cleanup(VLANClientState *nc) |
835 |
{ |
836 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
837 |
|
838 |
n->nic = NULL;
|
839 |
} |
840 |
|
841 |
static NetClientInfo net_virtio_info = {
|
842 |
.type = NET_CLIENT_TYPE_NIC, |
843 |
.size = sizeof(NICState),
|
844 |
.can_receive = virtio_net_can_receive, |
845 |
.receive = virtio_net_receive, |
846 |
.cleanup = virtio_net_cleanup, |
847 |
.link_status_changed = virtio_net_set_link_status, |
848 |
}; |
849 |
|
850 |
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) |
851 |
{ |
852 |
VirtIONet *n = to_virtio_net(vdev); |
853 |
if (!n->nic->nc.peer) {
|
854 |
return;
|
855 |
} |
856 |
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
|
857 |
return;
|
858 |
} |
859 |
|
860 |
if (!tap_get_vhost_net(n->nic->nc.peer)) {
|
861 |
return;
|
862 |
} |
863 |
if (!!n->vhost_started == !!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
864 |
return;
|
865 |
} |
866 |
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
|
867 |
int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), vdev);
|
868 |
if (r < 0) { |
869 |
fprintf(stderr, "unable to start vhost net: %d: "
|
870 |
"falling back on userspace virtio\n", -r);
|
871 |
} else {
|
872 |
n->vhost_started = 1;
|
873 |
} |
874 |
} else {
|
875 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
876 |
n->vhost_started = 0;
|
877 |
} |
878 |
} |
879 |
|
880 |
static void virtio_net_vmstate_change(void *opaque, int running, int reason) |
881 |
{ |
882 |
VirtIONet *n = opaque; |
883 |
uint8_t status = running ? VIRTIO_CONFIG_S_DRIVER_OK : 0;
|
884 |
/* This is called when vm is started/stopped,
|
885 |
* it will start/stop vhost backend if * appropriate
|
886 |
* e.g. after migration. */
|
887 |
virtio_net_set_status(&n->vdev, n->vdev.status & status); |
888 |
} |
889 |
|
890 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf) |
891 |
{ |
892 |
VirtIONet *n; |
893 |
static int virtio_net_id; |
894 |
|
895 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
896 |
sizeof(struct virtio_net_config), |
897 |
sizeof(VirtIONet));
|
898 |
|
899 |
n->vdev.get_config = virtio_net_get_config; |
900 |
n->vdev.set_config = virtio_net_set_config; |
901 |
n->vdev.get_features = virtio_net_get_features; |
902 |
n->vdev.set_features = virtio_net_set_features; |
903 |
n->vdev.bad_features = virtio_net_bad_features; |
904 |
n->vdev.reset = virtio_net_reset; |
905 |
n->vdev.set_status = virtio_net_set_status; |
906 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
907 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
908 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
909 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
910 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
911 |
n->status = VIRTIO_NET_S_LINK_UP; |
912 |
|
913 |
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n); |
914 |
|
915 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
916 |
|
917 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
918 |
n->tx_timer_active = 0;
|
919 |
n->mergeable_rx_bufs = 0;
|
920 |
n->promisc = 1; /* for compatibility */ |
921 |
|
922 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
923 |
|
924 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
925 |
|
926 |
register_savevm(NULL, "virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION, |
927 |
virtio_net_save, virtio_net_load, n); |
928 |
n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n); |
929 |
|
930 |
return &n->vdev;
|
931 |
} |
932 |
|
933 |
void virtio_net_exit(VirtIODevice *vdev)
|
934 |
{ |
935 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
936 |
qemu_del_vm_change_state_handler(n->vmstate); |
937 |
|
938 |
if (n->vhost_started) {
|
939 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
940 |
} |
941 |
|
942 |
qemu_purge_queued_packets(&n->nic->nc); |
943 |
|
944 |
unregister_savevm(NULL, "virtio-net", n); |
945 |
|
946 |
qemu_free(n->mac_table.macs); |
947 |
qemu_free(n->vlans); |
948 |
|
949 |
qemu_del_timer(n->tx_timer); |
950 |
qemu_free_timer(n->tx_timer); |
951 |
|
952 |
virtio_cleanup(&n->vdev); |
953 |
qemu_del_vlan_client(&n->nic->nc); |
954 |
} |