root / hw / virtio-net.c @ 1d41b0c1
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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 "virtio.h" |
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#include "net.h" |
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#include "qemu-timer.h" |
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#include "virtio-net.h" |
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#define VIRTIO_NET_VM_VERSION 10 |
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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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VLANClientState *vc; |
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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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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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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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|
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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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|
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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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|
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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->vc, n->mac); |
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} |
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} |
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static void virtio_net_set_link_status(VLANClientState *vc) |
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{
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VirtIONet *n = vc->opaque; |
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uint16_t old_status = n->status; |
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|
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if (vc->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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/* 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->vc->peer)
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return 0; |
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if (n->vc->peer->type != NET_CLIENT_TYPE_TAP)
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return 0; |
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n->has_vnet_hdr = tap_has_vnet_hdr(n->vc->peer); |
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return n->has_vnet_hdr;
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} |
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static uint32_t virtio_net_get_features(VirtIODevice *vdev)
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{
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VirtIONet *n = to_virtio_net(vdev); |
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uint32_t features = (1 << VIRTIO_NET_F_MAC) |
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(1 << VIRTIO_NET_F_MRG_RXBUF) |
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(1 << VIRTIO_NET_F_STATUS) |
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(1 << VIRTIO_NET_F_CTRL_VQ) |
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(1 << VIRTIO_NET_F_CTRL_RX) |
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(1 << VIRTIO_NET_F_CTRL_VLAN) |
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(1 << VIRTIO_NET_F_CTRL_RX_EXTRA);
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if (peer_has_vnet_hdr(n)) {
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tap_using_vnet_hdr(n->vc->peer, 1);
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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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features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
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features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
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features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
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features |= (1 << VIRTIO_NET_F_GUEST_ECN);
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} |
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return 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_GUEST_CSUM);
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features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
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features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
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features |= (1 << VIRTIO_NET_F_GUEST_ECN);
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return features & virtio_net_get_features(vdev);
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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->vc->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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} |
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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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|
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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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|
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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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|
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vid = lduw_le_p(elem->out_sg[1].iov_base);
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|
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if (vid >= MAX_VLAN)
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return VIRTIO_NET_ERR;
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
|
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|
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virtqueue_push(vq, &elem, sizeof(status));
|
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virtio_notify(vdev, vq); |
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} |
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} |
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|
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/* RX */
|
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|
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static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
| 341 |
{
|
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VirtIONet *n = to_virtio_net(vdev); |
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|
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qemu_flush_queued_packets(n->vc); |
| 345 |
|
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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(); |
| 349 |
} |
| 350 |
|
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static int do_virtio_net_can_receive(VirtIONet *n, int bufsize) |
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{
|
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if (!virtio_queue_ready(n->rx_vq) ||
|
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!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
| 355 |
return 0; |
| 356 |
|
| 357 |
if (virtio_queue_empty(n->rx_vq) ||
|
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(n->mergeable_rx_bufs && |
| 359 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
|
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virtio_queue_set_notification(n->rx_vq, 1);
|
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return 0; |
| 362 |
} |
| 363 |
|
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virtio_queue_set_notification(n->rx_vq, 0);
|
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return 1; |
| 366 |
} |
| 367 |
|
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static int virtio_net_can_receive(VLANClientState *vc) |
| 369 |
{
|
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VirtIONet *n = vc->opaque; |
| 371 |
|
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return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
|
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} |
| 374 |
|
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/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
| 376 |
* it never finds out that the packets don't have valid checksums. This
|
| 377 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
| 378 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
| 379 |
* dhclient yet.
|
| 380 |
*
|
| 381 |
* To avoid breaking existing guests, we catch udp packets and add
|
| 382 |
* checksums. This is terrible but it's better than hacking the guest
|
| 383 |
* kernels.
|
| 384 |
*
|
| 385 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
| 386 |
* we should provide a mechanism to disable it to avoid polluting the host
|
| 387 |
* cache.
|
| 388 |
*/
|
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static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
| 390 |
const uint8_t *buf, size_t size)
|
| 391 |
{
|
| 392 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
| 393 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
| 394 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
| 395 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
| 396 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
| 397 |
/* FIXME this cast is evil */
|
| 398 |
net_checksum_calculate((uint8_t *)buf, size); |
| 399 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 400 |
} |
| 401 |
} |
| 402 |
|
| 403 |
static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count) |
| 404 |
{
|
| 405 |
int offset, i;
|
| 406 |
|
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offset = i = 0;
|
| 408 |
while (offset < count && i < iovcnt) {
|
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int len = MIN(iov[i].iov_len, count - offset);
|
| 410 |
memcpy(iov[i].iov_base, buf + offset, len); |
| 411 |
offset += len; |
| 412 |
i++; |
| 413 |
} |
| 414 |
|
| 415 |
return offset;
|
| 416 |
} |
| 417 |
|
| 418 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
| 419 |
const void *buf, size_t size, size_t hdr_len) |
| 420 |
{
|
| 421 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
| 422 |
int offset = 0; |
| 423 |
|
| 424 |
hdr->flags = 0;
|
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hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| 426 |
|
| 427 |
if (n->has_vnet_hdr) {
|
| 428 |
memcpy(hdr, buf, sizeof(*hdr));
|
| 429 |
offset = sizeof(*hdr);
|
| 430 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
| 431 |
} |
| 432 |
|
| 433 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
| 434 |
* but we may be passing along a larger header to the guest.
|
| 435 |
*/
|
| 436 |
iov[0].iov_base += hdr_len;
|
| 437 |
iov[0].iov_len -= hdr_len;
|
| 438 |
|
| 439 |
return offset;
|
| 440 |
} |
| 441 |
|
| 442 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
| 443 |
{
|
| 444 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| 445 |
static const uint8_t vlan[] = {0x81, 0x00}; |
| 446 |
uint8_t *ptr = (uint8_t *)buf; |
| 447 |
int i;
|
| 448 |
|
| 449 |
if (n->promisc)
|
| 450 |
return 1; |
| 451 |
|
| 452 |
if (n->has_vnet_hdr) {
|
| 453 |
ptr += sizeof(struct virtio_net_hdr); |
| 454 |
} |
| 455 |
|
| 456 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
| 457 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
| 458 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
| 459 |
return 0; |
| 460 |
} |
| 461 |
|
| 462 |
if (ptr[0] & 1) { // multicast |
| 463 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
| 464 |
return !n->nobcast;
|
| 465 |
} else if (n->nomulti) { |
| 466 |
return 0; |
| 467 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
| 468 |
return 1; |
| 469 |
} |
| 470 |
|
| 471 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
| 472 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 473 |
return 1; |
| 474 |
} |
| 475 |
} |
| 476 |
} else { // unicast |
| 477 |
if (n->nouni) {
|
| 478 |
return 0; |
| 479 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
| 480 |
return 1; |
| 481 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
| 482 |
return 1; |
| 483 |
} |
| 484 |
|
| 485 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
| 486 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 487 |
return 1; |
| 488 |
} |
| 489 |
} |
| 490 |
} |
| 491 |
|
| 492 |
return 0; |
| 493 |
} |
| 494 |
|
| 495 |
static ssize_t virtio_net_receive(VLANClientState *vc, const uint8_t *buf, size_t size) |
| 496 |
{
|
| 497 |
VirtIONet *n = vc->opaque; |
| 498 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
| 499 |
size_t hdr_len, offset, i; |
| 500 |
|
| 501 |
if (!do_virtio_net_can_receive(n, size))
|
| 502 |
return 0; |
| 503 |
|
| 504 |
if (!receive_filter(n, buf, size))
|
| 505 |
return size;
|
| 506 |
|
| 507 |
/* hdr_len refers to the header we supply to the guest */
|
| 508 |
hdr_len = n->mergeable_rx_bufs ? |
| 509 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
| 510 |
|
| 511 |
offset = i = 0;
|
| 512 |
|
| 513 |
while (offset < size) {
|
| 514 |
VirtQueueElement elem; |
| 515 |
int len, total;
|
| 516 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
| 517 |
|
| 518 |
len = total = 0;
|
| 519 |
|
| 520 |
if ((i != 0 && !n->mergeable_rx_bufs) || |
| 521 |
virtqueue_pop(n->rx_vq, &elem) == 0) {
|
| 522 |
if (i == 0) |
| 523 |
return -1; |
| 524 |
fprintf(stderr, "virtio-net truncating packet\n");
|
| 525 |
exit(1);
|
| 526 |
} |
| 527 |
|
| 528 |
if (elem.in_num < 1) { |
| 529 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
| 530 |
exit(1);
|
| 531 |
} |
| 532 |
|
| 533 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { |
| 534 |
fprintf(stderr, "virtio-net header not in first element\n");
|
| 535 |
exit(1);
|
| 536 |
} |
| 537 |
|
| 538 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
| 539 |
|
| 540 |
if (i == 0) { |
| 541 |
if (n->mergeable_rx_bufs)
|
| 542 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
| 543 |
|
| 544 |
offset += receive_header(n, sg, elem.in_num, |
| 545 |
buf + offset, size - offset, hdr_len); |
| 546 |
total += hdr_len; |
| 547 |
} |
| 548 |
|
| 549 |
/* copy in packet. ugh */
|
| 550 |
len = iov_fill(sg, elem.in_num, |
| 551 |
buf + offset, size - offset); |
| 552 |
total += len; |
| 553 |
|
| 554 |
/* signal other side */
|
| 555 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
| 556 |
|
| 557 |
offset += len; |
| 558 |
} |
| 559 |
|
| 560 |
if (mhdr)
|
| 561 |
mhdr->num_buffers = i; |
| 562 |
|
| 563 |
virtqueue_flush(n->rx_vq, i); |
| 564 |
virtio_notify(&n->vdev, n->rx_vq); |
| 565 |
|
| 566 |
return size;
|
| 567 |
} |
| 568 |
|
| 569 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); |
| 570 |
|
| 571 |
static void virtio_net_tx_complete(VLANClientState *vc, ssize_t len) |
| 572 |
{
|
| 573 |
VirtIONet *n = vc->opaque; |
| 574 |
|
| 575 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
| 576 |
virtio_notify(&n->vdev, n->tx_vq); |
| 577 |
|
| 578 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
| 579 |
|
| 580 |
virtio_queue_set_notification(n->tx_vq, 1);
|
| 581 |
virtio_net_flush_tx(n, n->tx_vq); |
| 582 |
} |
| 583 |
|
| 584 |
/* TX */
|
| 585 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
| 586 |
{
|
| 587 |
VirtQueueElement elem; |
| 588 |
|
| 589 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
| 590 |
return;
|
| 591 |
|
| 592 |
if (n->async_tx.elem.out_num) {
|
| 593 |
virtio_queue_set_notification(n->tx_vq, 0);
|
| 594 |
return;
|
| 595 |
} |
| 596 |
|
| 597 |
while (virtqueue_pop(vq, &elem)) {
|
| 598 |
ssize_t ret, len = 0;
|
| 599 |
unsigned int out_num = elem.out_num; |
| 600 |
struct iovec *out_sg = &elem.out_sg[0]; |
| 601 |
unsigned hdr_len;
|
| 602 |
|
| 603 |
/* hdr_len refers to the header received from the guest */
|
| 604 |
hdr_len = n->mergeable_rx_bufs ? |
| 605 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
| 606 |
sizeof(struct virtio_net_hdr); |
| 607 |
|
| 608 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
| 609 |
fprintf(stderr, "virtio-net header not in first element\n");
|
| 610 |
exit(1);
|
| 611 |
} |
| 612 |
|
| 613 |
/* ignore the header if GSO is not supported */
|
| 614 |
if (!n->has_vnet_hdr) {
|
| 615 |
out_num--; |
| 616 |
out_sg++; |
| 617 |
len += hdr_len; |
| 618 |
} else if (n->mergeable_rx_bufs) { |
| 619 |
/* tapfd expects a struct virtio_net_hdr */
|
| 620 |
hdr_len -= sizeof(struct virtio_net_hdr); |
| 621 |
out_sg->iov_len -= hdr_len; |
| 622 |
len += hdr_len; |
| 623 |
} |
| 624 |
|
| 625 |
ret = qemu_sendv_packet_async(n->vc, out_sg, out_num, |
| 626 |
virtio_net_tx_complete); |
| 627 |
if (ret == 0) { |
| 628 |
virtio_queue_set_notification(n->tx_vq, 0);
|
| 629 |
n->async_tx.elem = elem; |
| 630 |
n->async_tx.len = len; |
| 631 |
return;
|
| 632 |
} |
| 633 |
|
| 634 |
len += ret; |
| 635 |
|
| 636 |
virtqueue_push(vq, &elem, len); |
| 637 |
virtio_notify(&n->vdev, vq); |
| 638 |
} |
| 639 |
} |
| 640 |
|
| 641 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
| 642 |
{
|
| 643 |
VirtIONet *n = to_virtio_net(vdev); |
| 644 |
|
| 645 |
if (n->tx_timer_active) {
|
| 646 |
virtio_queue_set_notification(vq, 1);
|
| 647 |
qemu_del_timer(n->tx_timer); |
| 648 |
n->tx_timer_active = 0;
|
| 649 |
virtio_net_flush_tx(n, vq); |
| 650 |
} else {
|
| 651 |
qemu_mod_timer(n->tx_timer, |
| 652 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
| 653 |
n->tx_timer_active = 1;
|
| 654 |
virtio_queue_set_notification(vq, 0);
|
| 655 |
} |
| 656 |
} |
| 657 |
|
| 658 |
static void virtio_net_tx_timer(void *opaque) |
| 659 |
{
|
| 660 |
VirtIONet *n = opaque; |
| 661 |
|
| 662 |
n->tx_timer_active = 0;
|
| 663 |
|
| 664 |
/* Just in case the driver is not ready on more */
|
| 665 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
| 666 |
return;
|
| 667 |
|
| 668 |
virtio_queue_set_notification(n->tx_vq, 1);
|
| 669 |
virtio_net_flush_tx(n, n->tx_vq); |
| 670 |
} |
| 671 |
|
| 672 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
| 673 |
{
|
| 674 |
VirtIONet *n = opaque; |
| 675 |
|
| 676 |
virtio_save(&n->vdev, f); |
| 677 |
|
| 678 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
| 679 |
qemu_put_be32(f, n->tx_timer_active); |
| 680 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
| 681 |
qemu_put_be16(f, n->status); |
| 682 |
qemu_put_byte(f, n->promisc); |
| 683 |
qemu_put_byte(f, n->allmulti); |
| 684 |
qemu_put_be32(f, n->mac_table.in_use); |
| 685 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
| 686 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 687 |
qemu_put_be32(f, n->has_vnet_hdr); |
| 688 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
| 689 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
| 690 |
qemu_put_byte(f, n->alluni); |
| 691 |
qemu_put_byte(f, n->nomulti); |
| 692 |
qemu_put_byte(f, n->nouni); |
| 693 |
qemu_put_byte(f, n->nobcast); |
| 694 |
} |
| 695 |
|
| 696 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
| 697 |
{
|
| 698 |
VirtIONet *n = opaque; |
| 699 |
int i;
|
| 700 |
|
| 701 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
| 702 |
return -EINVAL;
|
| 703 |
|
| 704 |
virtio_load(&n->vdev, f); |
| 705 |
|
| 706 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
| 707 |
n->tx_timer_active = qemu_get_be32(f); |
| 708 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
| 709 |
|
| 710 |
if (version_id >= 3) |
| 711 |
n->status = qemu_get_be16(f); |
| 712 |
|
| 713 |
if (version_id >= 4) { |
| 714 |
if (version_id < 8) { |
| 715 |
n->promisc = qemu_get_be32(f); |
| 716 |
n->allmulti = qemu_get_be32(f); |
| 717 |
} else {
|
| 718 |
n->promisc = qemu_get_byte(f); |
| 719 |
n->allmulti = qemu_get_byte(f); |
| 720 |
} |
| 721 |
} |
| 722 |
|
| 723 |
if (version_id >= 5) { |
| 724 |
n->mac_table.in_use = qemu_get_be32(f); |
| 725 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
| 726 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
| 727 |
qemu_get_buffer(f, n->mac_table.macs, |
| 728 |
n->mac_table.in_use * ETH_ALEN); |
| 729 |
} else if (n->mac_table.in_use) { |
| 730 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
| 731 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
| 732 |
n->mac_table.in_use = 0;
|
| 733 |
} |
| 734 |
} |
| 735 |
|
| 736 |
if (version_id >= 6) |
| 737 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 738 |
|
| 739 |
if (version_id >= 7) { |
| 740 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
| 741 |
qemu_error("virtio-net: saved image requires vnet_hdr=on\n");
|
| 742 |
return -1; |
| 743 |
} |
| 744 |
|
| 745 |
if (n->has_vnet_hdr) {
|
| 746 |
tap_using_vnet_hdr(n->vc->peer, 1);
|
| 747 |
tap_set_offload(n->vc->peer, |
| 748 |
(n->vdev.features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
| 749 |
(n->vdev.features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
| 750 |
(n->vdev.features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
| 751 |
(n->vdev.features >> VIRTIO_NET_F_GUEST_ECN) & 1);
|
| 752 |
} |
| 753 |
} |
| 754 |
|
| 755 |
if (version_id >= 9) { |
| 756 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
| 757 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
| 758 |
} |
| 759 |
|
| 760 |
if (version_id >= 10) { |
| 761 |
n->alluni = qemu_get_byte(f); |
| 762 |
n->nomulti = qemu_get_byte(f); |
| 763 |
n->nouni = qemu_get_byte(f); |
| 764 |
n->nobcast = qemu_get_byte(f); |
| 765 |
} |
| 766 |
|
| 767 |
/* Find the first multicast entry in the saved MAC filter */
|
| 768 |
for (i = 0; i < n->mac_table.in_use; i++) { |
| 769 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
| 770 |
break;
|
| 771 |
} |
| 772 |
} |
| 773 |
n->mac_table.first_multi = i; |
| 774 |
|
| 775 |
if (n->tx_timer_active) {
|
| 776 |
qemu_mod_timer(n->tx_timer, |
| 777 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
| 778 |
} |
| 779 |
|
| 780 |
return 0; |
| 781 |
} |
| 782 |
|
| 783 |
static void virtio_net_cleanup(VLANClientState *vc) |
| 784 |
{
|
| 785 |
VirtIONet *n = vc->opaque; |
| 786 |
|
| 787 |
n->vc = NULL;
|
| 788 |
} |
| 789 |
|
| 790 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf) |
| 791 |
{
|
| 792 |
VirtIONet *n; |
| 793 |
static int virtio_net_id; |
| 794 |
|
| 795 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
| 796 |
sizeof(struct virtio_net_config), |
| 797 |
sizeof(VirtIONet));
|
| 798 |
|
| 799 |
n->vdev.get_config = virtio_net_get_config; |
| 800 |
n->vdev.set_config = virtio_net_set_config; |
| 801 |
n->vdev.get_features = virtio_net_get_features; |
| 802 |
n->vdev.set_features = virtio_net_set_features; |
| 803 |
n->vdev.bad_features = virtio_net_bad_features; |
| 804 |
n->vdev.reset = virtio_net_reset; |
| 805 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
| 806 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
| 807 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
| 808 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
| 809 |
n->status = VIRTIO_NET_S_LINK_UP; |
| 810 |
n->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_NIC, conf->vlan, conf->peer, |
| 811 |
dev->info->name, dev->id, |
| 812 |
virtio_net_can_receive, |
| 813 |
virtio_net_receive, NULL, NULL, |
| 814 |
virtio_net_cleanup, n); |
| 815 |
n->vc->link_status_changed = virtio_net_set_link_status; |
| 816 |
|
| 817 |
qemu_format_nic_info_str(n->vc, conf->macaddr.a); |
| 818 |
|
| 819 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
| 820 |
n->tx_timer_active = 0;
|
| 821 |
n->mergeable_rx_bufs = 0;
|
| 822 |
n->promisc = 1; /* for compatibility */ |
| 823 |
|
| 824 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
| 825 |
|
| 826 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
| 827 |
|
| 828 |
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
|
| 829 |
virtio_net_save, virtio_net_load, n); |
| 830 |
|
| 831 |
return &n->vdev;
|
| 832 |
} |
| 833 |
|
| 834 |
void virtio_net_exit(VirtIODevice *vdev)
|
| 835 |
{
|
| 836 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
| 837 |
|
| 838 |
qemu_purge_queued_packets(n->vc); |
| 839 |
|
| 840 |
unregister_savevm("virtio-net", n);
|
| 841 |
|
| 842 |
qemu_free(n->mac_table.macs); |
| 843 |
qemu_free(n->vlans); |
| 844 |
|
| 845 |
qemu_del_timer(n->tx_timer); |
| 846 |
qemu_free_timer(n->tx_timer); |
| 847 |
|
| 848 |
virtio_cleanup(&n->vdev); |
| 849 |
qemu_del_vlan_client(n->vc); |
| 850 |
} |