If the backend could not transmit a packet right away for some reason, the packet is queued for asynchronous sending. The corresponding vq element is tracked in the async_tx.elem field of the VirtIONetQueue, for later freeing when the transmission is complete. If a reset happens before completion, virtio_net_tx_complete() will push async_tx.elem back to the guest anyway, and we end up with the inuse flag of the vq being equal to -1. The next call to virtqueue_pop() is then likely to fail with "Virtqueue size exceeded". This can be reproduced easily by starting a guest with an hubport backend that is not connected to a functional network, eg, -device virtio-net-pci,netdev=hub0 -netdev hubport,id=hub0,hubid=0 and no other -netdev hubport,hubid=0 on the command line. The appropriate fix is to ensure that such an asynchronous transmission cannot survive a device reset. So for all queues, we first try to send the packet again, and eventually we purge it if the backend still could not deliver it. CC: qemu-stable@nongnu.org Reported-by: R. Nageswara Sastry <nasastry@in.ibm.com> Buglink: https://github.com/open-power-host-os/qemu/issues/37 Signed-off-by: Greg Kurz <groug@kaod.org> Tested-by: R. Nageswara Sastry <nasastry@in.ibm.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
2241 lines
68 KiB
C
2241 lines
68 KiB
C
/*
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* Virtio Network Device
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/iov.h"
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#include "hw/virtio/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 "hw/virtio/virtio-net.h"
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#include "net/vhost_net.h"
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#include "hw/virtio/virtio-bus.h"
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#include "qapi/error.h"
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#include "qapi/qapi-events-net.h"
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#include "hw/virtio/virtio-access.h"
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#include "migration/misc.h"
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#include "standard-headers/linux/ethtool.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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/* previously fixed value */
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#define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
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#define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
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/* for now, only allow larger queues; with virtio-1, guest can downsize */
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#define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
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#define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
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/*
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* Calculate the number of bytes up to and including the given 'field' of
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* 'container'.
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*/
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#define endof(container, field) \
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(offsetof(container, field) + sizeof(((container *)0)->field))
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typedef struct VirtIOFeature {
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uint64_t flags;
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size_t end;
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} VirtIOFeature;
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static VirtIOFeature feature_sizes[] = {
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{.flags = 1ULL << VIRTIO_NET_F_MAC,
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.end = endof(struct virtio_net_config, mac)},
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{.flags = 1ULL << VIRTIO_NET_F_STATUS,
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.end = endof(struct virtio_net_config, status)},
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{.flags = 1ULL << VIRTIO_NET_F_MQ,
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.end = endof(struct virtio_net_config, max_virtqueue_pairs)},
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{.flags = 1ULL << VIRTIO_NET_F_MTU,
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.end = endof(struct virtio_net_config, mtu)},
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{.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX,
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.end = endof(struct virtio_net_config, duplex)},
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{}
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};
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static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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return &n->vqs[nc->queue_index];
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}
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static int vq2q(int queue_index)
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{
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return queue_index / 2;
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}
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/* TODO
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* - we could suppress RX interrupt if we were so inclined.
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*/
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static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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VirtIONet *n = VIRTIO_NET(vdev);
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struct virtio_net_config netcfg;
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virtio_stw_p(vdev, &netcfg.status, n->status);
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virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
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virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
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memcpy(netcfg.mac, n->mac, ETH_ALEN);
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virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
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netcfg.duplex = n->net_conf.duplex;
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memcpy(config, &netcfg, n->config_size);
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}
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static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
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{
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VirtIONet *n = VIRTIO_NET(vdev);
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struct virtio_net_config netcfg = {};
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memcpy(&netcfg, config, n->config_size);
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if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
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!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
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memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
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memcpy(n->mac, netcfg.mac, ETH_ALEN);
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qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
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}
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}
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static bool virtio_net_started(VirtIONet *n, uint8_t status)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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(n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
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}
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static void virtio_net_announce_timer(void *opaque)
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{
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VirtIONet *n = opaque;
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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n->announce_counter--;
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n->status |= VIRTIO_NET_S_ANNOUNCE;
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virtio_notify_config(vdev);
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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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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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NetClientState *nc = qemu_get_queue(n->nic);
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int queues = n->multiqueue ? n->max_queues : 1;
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if (!get_vhost_net(nc->peer)) {
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return;
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}
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if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
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!!n->vhost_started) {
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return;
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}
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if (!n->vhost_started) {
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int r, i;
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if (n->needs_vnet_hdr_swap) {
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error_report("backend does not support %s vnet headers; "
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"falling back on userspace virtio",
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virtio_is_big_endian(vdev) ? "BE" : "LE");
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return;
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}
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/* Any packets outstanding? Purge them to avoid touching rings
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* when vhost is running.
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*/
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for (i = 0; i < queues; i++) {
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NetClientState *qnc = qemu_get_subqueue(n->nic, i);
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/* Purge both directions: TX and RX. */
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qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
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qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
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}
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if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) {
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r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu);
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if (r < 0) {
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error_report("%uBytes MTU not supported by the backend",
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n->net_conf.mtu);
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return;
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}
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}
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n->vhost_started = 1;
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r = vhost_net_start(vdev, n->nic->ncs, queues);
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if (r < 0) {
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error_report("unable to start vhost net: %d: "
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"falling back on userspace virtio", -r);
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n->vhost_started = 0;
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}
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} else {
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vhost_net_stop(vdev, n->nic->ncs, queues);
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n->vhost_started = 0;
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}
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}
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static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev,
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NetClientState *peer,
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bool enable)
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{
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if (virtio_is_big_endian(vdev)) {
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return qemu_set_vnet_be(peer, enable);
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} else {
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return qemu_set_vnet_le(peer, enable);
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}
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}
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static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs,
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int queues, bool enable)
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{
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int i;
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for (i = 0; i < queues; i++) {
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if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 &&
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enable) {
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while (--i >= 0) {
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virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false);
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}
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return true;
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}
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}
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return false;
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}
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static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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int queues = n->multiqueue ? n->max_queues : 1;
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if (virtio_net_started(n, status)) {
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/* Before using the device, we tell the network backend about the
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* endianness to use when parsing vnet headers. If the backend
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* can't do it, we fallback onto fixing the headers in the core
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* virtio-net code.
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*/
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n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
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queues, true);
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} else if (virtio_net_started(n, vdev->status)) {
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/* After using the device, we need to reset the network backend to
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* the default (guest native endianness), otherwise the guest may
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* lose network connectivity if it is rebooted into a different
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* endianness.
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*/
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virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false);
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}
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}
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static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
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{
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unsigned int dropped = virtqueue_drop_all(vq);
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if (dropped) {
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virtio_notify(vdev, vq);
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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 = VIRTIO_NET(vdev);
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VirtIONetQueue *q;
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int i;
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uint8_t queue_status;
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virtio_net_vnet_endian_status(n, status);
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virtio_net_vhost_status(n, status);
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for (i = 0; i < n->max_queues; i++) {
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NetClientState *ncs = qemu_get_subqueue(n->nic, i);
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bool queue_started;
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q = &n->vqs[i];
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if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
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queue_status = 0;
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} else {
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queue_status = status;
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}
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queue_started =
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virtio_net_started(n, queue_status) && !n->vhost_started;
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if (queue_started) {
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qemu_flush_queued_packets(ncs);
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}
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if (!q->tx_waiting) {
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continue;
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}
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if (queue_started) {
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if (q->tx_timer) {
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timer_mod(q->tx_timer,
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qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
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} else {
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qemu_bh_schedule(q->tx_bh);
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}
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} else {
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if (q->tx_timer) {
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timer_del(q->tx_timer);
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} else {
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qemu_bh_cancel(q->tx_bh);
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}
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if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
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(queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
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vdev->vm_running) {
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/* if tx is waiting we are likely have some packets in tx queue
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* and disabled notification */
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q->tx_waiting = 0;
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virtio_queue_set_notification(q->tx_vq, 1);
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virtio_net_drop_tx_queue_data(vdev, q->tx_vq);
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}
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}
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}
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}
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static void virtio_net_set_link_status(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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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(vdev);
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virtio_net_set_status(vdev, vdev->status);
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}
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static void rxfilter_notify(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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if (nc->rxfilter_notify_enabled) {
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gchar *path = object_get_canonical_path(OBJECT(n->qdev));
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qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
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n->netclient_name, path, &error_abort);
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g_free(path);
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/* disable event notification to avoid events flooding */
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nc->rxfilter_notify_enabled = 0;
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}
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}
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static intList *get_vlan_table(VirtIONet *n)
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{
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intList *list, *entry;
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int i, j;
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list = NULL;
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for (i = 0; i < MAX_VLAN >> 5; i++) {
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for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
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if (n->vlans[i] & (1U << j)) {
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entry = g_malloc0(sizeof(*entry));
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entry->value = (i << 5) + j;
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entry->next = list;
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list = entry;
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}
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}
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}
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return list;
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}
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static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
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{
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VirtIONet *n = qemu_get_nic_opaque(nc);
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VirtIODevice *vdev = VIRTIO_DEVICE(n);
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RxFilterInfo *info;
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strList *str_list, *entry;
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int i;
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info = g_malloc0(sizeof(*info));
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info->name = g_strdup(nc->name);
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info->promiscuous = n->promisc;
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if (n->nouni) {
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info->unicast = RX_STATE_NONE;
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} else if (n->alluni) {
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info->unicast = RX_STATE_ALL;
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} else {
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info->unicast = RX_STATE_NORMAL;
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}
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if (n->nomulti) {
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info->multicast = RX_STATE_NONE;
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} else if (n->allmulti) {
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info->multicast = RX_STATE_ALL;
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} else {
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info->multicast = RX_STATE_NORMAL;
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}
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info->broadcast_allowed = n->nobcast;
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info->multicast_overflow = n->mac_table.multi_overflow;
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info->unicast_overflow = n->mac_table.uni_overflow;
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info->main_mac = qemu_mac_strdup_printf(n->mac);
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str_list = NULL;
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for (i = 0; i < n->mac_table.first_multi; i++) {
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entry = g_malloc0(sizeof(*entry));
|
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entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
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entry->next = str_list;
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str_list = entry;
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}
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info->unicast_table = str_list;
|
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|
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str_list = NULL;
|
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for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
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entry = g_malloc0(sizeof(*entry));
|
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entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
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entry->next = str_list;
|
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str_list = entry;
|
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}
|
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info->multicast_table = str_list;
|
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info->vlan_table = get_vlan_table(n);
|
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|
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if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
|
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info->vlan = RX_STATE_ALL;
|
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} else if (!info->vlan_table) {
|
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info->vlan = RX_STATE_NONE;
|
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} else {
|
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info->vlan = RX_STATE_NORMAL;
|
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}
|
|
|
|
/* enable event notification after query */
|
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nc->rxfilter_notify_enabled = 1;
|
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|
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return info;
|
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}
|
|
|
|
static void virtio_net_reset(VirtIODevice *vdev)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
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int i;
|
|
|
|
/* 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;
|
|
/* multiqueue is disabled by default */
|
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n->curr_queues = 1;
|
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timer_del(n->announce_timer);
|
|
n->announce_counter = 0;
|
|
n->status &= ~VIRTIO_NET_S_ANNOUNCE;
|
|
|
|
/* Flush any MAC and VLAN filter table state */
|
|
n->mac_table.in_use = 0;
|
|
n->mac_table.first_multi = 0;
|
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n->mac_table.multi_overflow = 0;
|
|
n->mac_table.uni_overflow = 0;
|
|
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
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memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
|
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qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
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memset(n->vlans, 0, MAX_VLAN >> 3);
|
|
|
|
/* Flush any async TX */
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, i);
|
|
|
|
if (nc->peer) {
|
|
qemu_flush_or_purge_queued_packets(nc->peer, true);
|
|
assert(!virtio_net_get_subqueue(nc)->async_tx.elem);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void peer_test_vnet_hdr(VirtIONet *n)
|
|
{
|
|
NetClientState *nc = qemu_get_queue(n->nic);
|
|
if (!nc->peer) {
|
|
return;
|
|
}
|
|
|
|
n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
|
|
}
|
|
|
|
static int peer_has_vnet_hdr(VirtIONet *n)
|
|
{
|
|
return n->has_vnet_hdr;
|
|
}
|
|
|
|
static int peer_has_ufo(VirtIONet *n)
|
|
{
|
|
if (!peer_has_vnet_hdr(n))
|
|
return 0;
|
|
|
|
n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
|
|
|
|
return n->has_ufo;
|
|
}
|
|
|
|
static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
|
|
int version_1)
|
|
{
|
|
int i;
|
|
NetClientState *nc;
|
|
|
|
n->mergeable_rx_bufs = mergeable_rx_bufs;
|
|
|
|
if (version_1) {
|
|
n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
|
|
} else {
|
|
n->guest_hdr_len = n->mergeable_rx_bufs ?
|
|
sizeof(struct virtio_net_hdr_mrg_rxbuf) :
|
|
sizeof(struct virtio_net_hdr);
|
|
}
|
|
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
nc = qemu_get_subqueue(n->nic, i);
|
|
|
|
if (peer_has_vnet_hdr(n) &&
|
|
qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
|
|
qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
|
|
n->host_hdr_len = n->guest_hdr_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int virtio_net_max_tx_queue_size(VirtIONet *n)
|
|
{
|
|
NetClientState *peer = n->nic_conf.peers.ncs[0];
|
|
|
|
/*
|
|
* Backends other than vhost-user don't support max queue size.
|
|
*/
|
|
if (!peer) {
|
|
return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
|
|
}
|
|
|
|
if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
|
|
return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
|
|
}
|
|
|
|
return VIRTQUEUE_MAX_SIZE;
|
|
}
|
|
|
|
static int peer_attach(VirtIONet *n, int index)
|
|
{
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, index);
|
|
|
|
if (!nc->peer) {
|
|
return 0;
|
|
}
|
|
|
|
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
|
|
vhost_set_vring_enable(nc->peer, 1);
|
|
}
|
|
|
|
if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
|
|
return 0;
|
|
}
|
|
|
|
if (n->max_queues == 1) {
|
|
return 0;
|
|
}
|
|
|
|
return tap_enable(nc->peer);
|
|
}
|
|
|
|
static int peer_detach(VirtIONet *n, int index)
|
|
{
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, index);
|
|
|
|
if (!nc->peer) {
|
|
return 0;
|
|
}
|
|
|
|
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
|
|
vhost_set_vring_enable(nc->peer, 0);
|
|
}
|
|
|
|
if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
|
|
return 0;
|
|
}
|
|
|
|
return tap_disable(nc->peer);
|
|
}
|
|
|
|
static void virtio_net_set_queues(VirtIONet *n)
|
|
{
|
|
int i;
|
|
int r;
|
|
|
|
if (n->nic->peer_deleted) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
if (i < n->curr_queues) {
|
|
r = peer_attach(n, i);
|
|
assert(!r);
|
|
} else {
|
|
r = peer_detach(n, i);
|
|
assert(!r);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
|
|
|
|
static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
|
|
Error **errp)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
NetClientState *nc = qemu_get_queue(n->nic);
|
|
|
|
/* Firstly sync all virtio-net possible supported features */
|
|
features |= n->host_features;
|
|
|
|
virtio_add_feature(&features, VIRTIO_NET_F_MAC);
|
|
|
|
if (!peer_has_vnet_hdr(n)) {
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
|
|
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
|
|
}
|
|
|
|
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
|
|
virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
|
|
}
|
|
|
|
if (!get_vhost_net(nc->peer)) {
|
|
return features;
|
|
}
|
|
features = vhost_net_get_features(get_vhost_net(nc->peer), features);
|
|
vdev->backend_features = features;
|
|
|
|
if (n->mtu_bypass_backend &&
|
|
(n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
|
|
features |= (1ULL << VIRTIO_NET_F_MTU);
|
|
}
|
|
|
|
return features;
|
|
}
|
|
|
|
static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
|
|
{
|
|
uint64_t features = 0;
|
|
|
|
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
|
|
* but also these: */
|
|
virtio_add_feature(&features, VIRTIO_NET_F_MAC);
|
|
virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
|
|
virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
|
|
virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
|
|
virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
|
|
|
|
return features;
|
|
}
|
|
|
|
static void virtio_net_apply_guest_offloads(VirtIONet *n)
|
|
{
|
|
qemu_set_offload(qemu_get_queue(n->nic)->peer,
|
|
!!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
|
|
!!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
|
|
!!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
|
|
!!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
|
|
!!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
|
|
}
|
|
|
|
static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
|
|
{
|
|
static const uint64_t guest_offloads_mask =
|
|
(1ULL << VIRTIO_NET_F_GUEST_CSUM) |
|
|
(1ULL << VIRTIO_NET_F_GUEST_TSO4) |
|
|
(1ULL << VIRTIO_NET_F_GUEST_TSO6) |
|
|
(1ULL << VIRTIO_NET_F_GUEST_ECN) |
|
|
(1ULL << VIRTIO_NET_F_GUEST_UFO);
|
|
|
|
return guest_offloads_mask & features;
|
|
}
|
|
|
|
static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
return virtio_net_guest_offloads_by_features(vdev->guest_features);
|
|
}
|
|
|
|
static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
int i;
|
|
|
|
if (n->mtu_bypass_backend &&
|
|
!virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
|
|
features &= ~(1ULL << VIRTIO_NET_F_MTU);
|
|
}
|
|
|
|
virtio_net_set_multiqueue(n,
|
|
virtio_has_feature(features, VIRTIO_NET_F_MQ));
|
|
|
|
virtio_net_set_mrg_rx_bufs(n,
|
|
virtio_has_feature(features,
|
|
VIRTIO_NET_F_MRG_RXBUF),
|
|
virtio_has_feature(features,
|
|
VIRTIO_F_VERSION_1));
|
|
|
|
if (n->has_vnet_hdr) {
|
|
n->curr_guest_offloads =
|
|
virtio_net_guest_offloads_by_features(features);
|
|
virtio_net_apply_guest_offloads(n);
|
|
}
|
|
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, i);
|
|
|
|
if (!get_vhost_net(nc->peer)) {
|
|
continue;
|
|
}
|
|
vhost_net_ack_features(get_vhost_net(nc->peer), features);
|
|
}
|
|
|
|
if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
|
|
memset(n->vlans, 0, MAX_VLAN >> 3);
|
|
} else {
|
|
memset(n->vlans, 0xff, MAX_VLAN >> 3);
|
|
}
|
|
}
|
|
|
|
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
uint8_t on;
|
|
size_t s;
|
|
NetClientState *nc = qemu_get_queue(n->nic);
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
|
|
if (s != sizeof(on)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
|
|
n->promisc = on;
|
|
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
|
|
n->allmulti = on;
|
|
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
|
|
n->alluni = on;
|
|
} else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
|
|
n->nomulti = on;
|
|
} else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
|
|
n->nouni = on;
|
|
} else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
|
|
n->nobcast = on;
|
|
} else {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
rxfilter_notify(nc);
|
|
|
|
return VIRTIO_NET_OK;
|
|
}
|
|
|
|
static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
uint64_t offloads;
|
|
size_t s;
|
|
|
|
if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
|
|
if (s != sizeof(offloads)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
|
|
uint64_t supported_offloads;
|
|
|
|
offloads = virtio_ldq_p(vdev, &offloads);
|
|
|
|
if (!n->has_vnet_hdr) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
supported_offloads = virtio_net_supported_guest_offloads(n);
|
|
if (offloads & ~supported_offloads) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
n->curr_guest_offloads = offloads;
|
|
virtio_net_apply_guest_offloads(n);
|
|
|
|
return VIRTIO_NET_OK;
|
|
} else {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
}
|
|
|
|
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
struct virtio_net_ctrl_mac mac_data;
|
|
size_t s;
|
|
NetClientState *nc = qemu_get_queue(n->nic);
|
|
|
|
if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
|
|
if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
|
|
assert(s == sizeof(n->mac));
|
|
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
|
|
rxfilter_notify(nc);
|
|
|
|
return VIRTIO_NET_OK;
|
|
}
|
|
|
|
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
int in_use = 0;
|
|
int first_multi = 0;
|
|
uint8_t uni_overflow = 0;
|
|
uint8_t multi_overflow = 0;
|
|
uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
|
sizeof(mac_data.entries));
|
|
mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
|
|
if (s != sizeof(mac_data.entries)) {
|
|
goto error;
|
|
}
|
|
iov_discard_front(&iov, &iov_cnt, s);
|
|
|
|
if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
|
|
goto error;
|
|
}
|
|
|
|
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
|
s = iov_to_buf(iov, iov_cnt, 0, macs,
|
|
mac_data.entries * ETH_ALEN);
|
|
if (s != mac_data.entries * ETH_ALEN) {
|
|
goto error;
|
|
}
|
|
in_use += mac_data.entries;
|
|
} else {
|
|
uni_overflow = 1;
|
|
}
|
|
|
|
iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
|
|
|
|
first_multi = in_use;
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
|
sizeof(mac_data.entries));
|
|
mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
|
|
if (s != sizeof(mac_data.entries)) {
|
|
goto error;
|
|
}
|
|
|
|
iov_discard_front(&iov, &iov_cnt, s);
|
|
|
|
if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
|
|
goto error;
|
|
}
|
|
|
|
if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
|
|
s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
|
|
mac_data.entries * ETH_ALEN);
|
|
if (s != mac_data.entries * ETH_ALEN) {
|
|
goto error;
|
|
}
|
|
in_use += mac_data.entries;
|
|
} else {
|
|
multi_overflow = 1;
|
|
}
|
|
|
|
n->mac_table.in_use = in_use;
|
|
n->mac_table.first_multi = first_multi;
|
|
n->mac_table.uni_overflow = uni_overflow;
|
|
n->mac_table.multi_overflow = multi_overflow;
|
|
memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
|
|
g_free(macs);
|
|
rxfilter_notify(nc);
|
|
|
|
return VIRTIO_NET_OK;
|
|
|
|
error:
|
|
g_free(macs);
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
uint16_t vid;
|
|
size_t s;
|
|
NetClientState *nc = qemu_get_queue(n->nic);
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
|
|
vid = virtio_lduw_p(vdev, &vid);
|
|
if (s != sizeof(vid)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
if (vid >= MAX_VLAN)
|
|
return VIRTIO_NET_ERR;
|
|
|
|
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
|
n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
|
|
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
|
|
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
|
|
else
|
|
return VIRTIO_NET_ERR;
|
|
|
|
rxfilter_notify(nc);
|
|
|
|
return VIRTIO_NET_OK;
|
|
}
|
|
|
|
static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
|
|
n->status & VIRTIO_NET_S_ANNOUNCE) {
|
|
n->status &= ~VIRTIO_NET_S_ANNOUNCE;
|
|
if (n->announce_counter) {
|
|
timer_mod(n->announce_timer,
|
|
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
|
|
self_announce_delay(n->announce_counter));
|
|
}
|
|
return VIRTIO_NET_OK;
|
|
} else {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
}
|
|
|
|
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
|
|
struct iovec *iov, unsigned int iov_cnt)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
struct virtio_net_ctrl_mq mq;
|
|
size_t s;
|
|
uint16_t queues;
|
|
|
|
s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
|
|
if (s != sizeof(mq)) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
|
|
|
|
if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
|
|
queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
|
|
queues > n->max_queues ||
|
|
!n->multiqueue) {
|
|
return VIRTIO_NET_ERR;
|
|
}
|
|
|
|
n->curr_queues = queues;
|
|
/* stop the backend before changing the number of queues to avoid handling a
|
|
* disabled queue */
|
|
virtio_net_set_status(vdev, vdev->status);
|
|
virtio_net_set_queues(n);
|
|
|
|
return VIRTIO_NET_OK;
|
|
}
|
|
|
|
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
struct virtio_net_ctrl_hdr ctrl;
|
|
virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
|
|
VirtQueueElement *elem;
|
|
size_t s;
|
|
struct iovec *iov, *iov2;
|
|
unsigned int iov_cnt;
|
|
|
|
for (;;) {
|
|
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
|
|
if (!elem) {
|
|
break;
|
|
}
|
|
if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
|
|
iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
|
|
virtio_error(vdev, "virtio-net ctrl missing headers");
|
|
virtqueue_detach_element(vq, elem, 0);
|
|
g_free(elem);
|
|
break;
|
|
}
|
|
|
|
iov_cnt = elem->out_num;
|
|
iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num);
|
|
s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
|
|
iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
|
|
if (s != sizeof(ctrl)) {
|
|
status = VIRTIO_NET_ERR;
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
|
|
status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
|
|
status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
|
|
status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
|
|
status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
|
|
status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
|
|
} else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
|
|
status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
|
|
}
|
|
|
|
s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
|
|
assert(s == sizeof(status));
|
|
|
|
virtqueue_push(vq, elem, sizeof(status));
|
|
virtio_notify(vdev, vq);
|
|
g_free(iov2);
|
|
g_free(elem);
|
|
}
|
|
}
|
|
|
|
/* RX */
|
|
|
|
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
int queue_index = vq2q(virtio_get_queue_index(vq));
|
|
|
|
qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
|
|
}
|
|
|
|
static int virtio_net_can_receive(NetClientState *nc)
|
|
{
|
|
VirtIONet *n = qemu_get_nic_opaque(nc);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
|
|
|
|
if (!vdev->vm_running) {
|
|
return 0;
|
|
}
|
|
|
|
if (nc->queue_index >= n->curr_queues) {
|
|
return 0;
|
|
}
|
|
|
|
if (!virtio_queue_ready(q->rx_vq) ||
|
|
!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
|
|
{
|
|
VirtIONet *n = q->n;
|
|
if (virtio_queue_empty(q->rx_vq) ||
|
|
(n->mergeable_rx_bufs &&
|
|
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
|
virtio_queue_set_notification(q->rx_vq, 1);
|
|
|
|
/* To avoid a race condition where the guest has made some buffers
|
|
* available after the above check but before notification was
|
|
* enabled, check for available buffers again.
|
|
*/
|
|
if (virtio_queue_empty(q->rx_vq) ||
|
|
(n->mergeable_rx_bufs &&
|
|
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
virtio_queue_set_notification(q->rx_vq, 0);
|
|
return 1;
|
|
}
|
|
|
|
static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
|
|
{
|
|
virtio_tswap16s(vdev, &hdr->hdr_len);
|
|
virtio_tswap16s(vdev, &hdr->gso_size);
|
|
virtio_tswap16s(vdev, &hdr->csum_start);
|
|
virtio_tswap16s(vdev, &hdr->csum_offset);
|
|
}
|
|
|
|
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
|
* it never finds out that the packets don't have valid checksums. This
|
|
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
|
* fix this with Xen but it hasn't appeared in an upstream release of
|
|
* dhclient yet.
|
|
*
|
|
* To avoid breaking existing guests, we catch udp packets and add
|
|
* checksums. This is terrible but it's better than hacking the guest
|
|
* kernels.
|
|
*
|
|
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
|
* we should provide a mechanism to disable it to avoid polluting the host
|
|
* cache.
|
|
*/
|
|
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
|
|
uint8_t *buf, size_t size)
|
|
{
|
|
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
|
|
(size > 27 && size < 1500) && /* normal sized MTU */
|
|
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
|
|
(buf[23] == 17) && /* ip.protocol == UDP */
|
|
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
|
|
net_checksum_calculate(buf, size);
|
|
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
|
|
}
|
|
}
|
|
|
|
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
|
|
const void *buf, size_t size)
|
|
{
|
|
if (n->has_vnet_hdr) {
|
|
/* FIXME this cast is evil */
|
|
void *wbuf = (void *)buf;
|
|
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
|
|
size - n->host_hdr_len);
|
|
|
|
if (n->needs_vnet_hdr_swap) {
|
|
virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
|
|
}
|
|
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
|
|
} else {
|
|
struct virtio_net_hdr hdr = {
|
|
.flags = 0,
|
|
.gso_type = VIRTIO_NET_HDR_GSO_NONE
|
|
};
|
|
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
|
|
}
|
|
}
|
|
|
|
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
|
|
{
|
|
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
|
|
static const uint8_t vlan[] = {0x81, 0x00};
|
|
uint8_t *ptr = (uint8_t *)buf;
|
|
int i;
|
|
|
|
if (n->promisc)
|
|
return 1;
|
|
|
|
ptr += n->host_hdr_len;
|
|
|
|
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
|
|
int vid = lduw_be_p(ptr + 14) & 0xfff;
|
|
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
|
|
return 0;
|
|
}
|
|
|
|
if (ptr[0] & 1) { // multicast
|
|
if (!memcmp(ptr, bcast, sizeof(bcast))) {
|
|
return !n->nobcast;
|
|
} else if (n->nomulti) {
|
|
return 0;
|
|
} else if (n->allmulti || n->mac_table.multi_overflow) {
|
|
return 1;
|
|
}
|
|
|
|
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
|
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
}
|
|
} else { // unicast
|
|
if (n->nouni) {
|
|
return 0;
|
|
} else if (n->alluni || n->mac_table.uni_overflow) {
|
|
return 1;
|
|
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
|
|
for (i = 0; i < n->mac_table.first_multi; i++) {
|
|
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
|
|
size_t size)
|
|
{
|
|
VirtIONet *n = qemu_get_nic_opaque(nc);
|
|
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
|
|
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
|
unsigned mhdr_cnt = 0;
|
|
size_t offset, i, guest_offset;
|
|
|
|
if (!virtio_net_can_receive(nc)) {
|
|
return -1;
|
|
}
|
|
|
|
/* hdr_len refers to the header we supply to the guest */
|
|
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
|
|
return 0;
|
|
}
|
|
|
|
if (!receive_filter(n, buf, size))
|
|
return size;
|
|
|
|
offset = i = 0;
|
|
|
|
while (offset < size) {
|
|
VirtQueueElement *elem;
|
|
int len, total;
|
|
const struct iovec *sg;
|
|
|
|
total = 0;
|
|
|
|
elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
|
|
if (!elem) {
|
|
if (i) {
|
|
virtio_error(vdev, "virtio-net unexpected empty queue: "
|
|
"i %zd mergeable %d offset %zd, size %zd, "
|
|
"guest hdr len %zd, host hdr len %zd "
|
|
"guest features 0x%" PRIx64,
|
|
i, n->mergeable_rx_bufs, offset, size,
|
|
n->guest_hdr_len, n->host_hdr_len,
|
|
vdev->guest_features);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if (elem->in_num < 1) {
|
|
virtio_error(vdev,
|
|
"virtio-net receive queue contains no in buffers");
|
|
virtqueue_detach_element(q->rx_vq, elem, 0);
|
|
g_free(elem);
|
|
return -1;
|
|
}
|
|
|
|
sg = elem->in_sg;
|
|
if (i == 0) {
|
|
assert(offset == 0);
|
|
if (n->mergeable_rx_bufs) {
|
|
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
|
|
sg, elem->in_num,
|
|
offsetof(typeof(mhdr), num_buffers),
|
|
sizeof(mhdr.num_buffers));
|
|
}
|
|
|
|
receive_header(n, sg, elem->in_num, buf, size);
|
|
offset = n->host_hdr_len;
|
|
total += n->guest_hdr_len;
|
|
guest_offset = n->guest_hdr_len;
|
|
} else {
|
|
guest_offset = 0;
|
|
}
|
|
|
|
/* copy in packet. ugh */
|
|
len = iov_from_buf(sg, elem->in_num, guest_offset,
|
|
buf + offset, size - offset);
|
|
total += len;
|
|
offset += len;
|
|
/* If buffers can't be merged, at this point we
|
|
* must have consumed the complete packet.
|
|
* Otherwise, drop it. */
|
|
if (!n->mergeable_rx_bufs && offset < size) {
|
|
virtqueue_unpop(q->rx_vq, elem, total);
|
|
g_free(elem);
|
|
return size;
|
|
}
|
|
|
|
/* signal other side */
|
|
virtqueue_fill(q->rx_vq, elem, total, i++);
|
|
g_free(elem);
|
|
}
|
|
|
|
if (mhdr_cnt) {
|
|
virtio_stw_p(vdev, &mhdr.num_buffers, i);
|
|
iov_from_buf(mhdr_sg, mhdr_cnt,
|
|
0,
|
|
&mhdr.num_buffers, sizeof mhdr.num_buffers);
|
|
}
|
|
|
|
virtqueue_flush(q->rx_vq, i);
|
|
virtio_notify(vdev, q->rx_vq);
|
|
|
|
return size;
|
|
}
|
|
|
|
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
|
|
size_t size)
|
|
{
|
|
ssize_t r;
|
|
|
|
rcu_read_lock();
|
|
r = virtio_net_receive_rcu(nc, buf, size);
|
|
rcu_read_unlock();
|
|
return r;
|
|
}
|
|
|
|
static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
|
|
|
|
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
|
|
{
|
|
VirtIONet *n = qemu_get_nic_opaque(nc);
|
|
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
|
|
virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
|
|
virtio_notify(vdev, q->tx_vq);
|
|
|
|
g_free(q->async_tx.elem);
|
|
q->async_tx.elem = NULL;
|
|
|
|
virtio_queue_set_notification(q->tx_vq, 1);
|
|
virtio_net_flush_tx(q);
|
|
}
|
|
|
|
/* TX */
|
|
static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
|
{
|
|
VirtIONet *n = q->n;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
VirtQueueElement *elem;
|
|
int32_t num_packets = 0;
|
|
int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return num_packets;
|
|
}
|
|
|
|
if (q->async_tx.elem) {
|
|
virtio_queue_set_notification(q->tx_vq, 0);
|
|
return num_packets;
|
|
}
|
|
|
|
for (;;) {
|
|
ssize_t ret;
|
|
unsigned int out_num;
|
|
struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
|
|
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
|
|
|
elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
|
|
if (!elem) {
|
|
break;
|
|
}
|
|
|
|
out_num = elem->out_num;
|
|
out_sg = elem->out_sg;
|
|
if (out_num < 1) {
|
|
virtio_error(vdev, "virtio-net header not in first element");
|
|
virtqueue_detach_element(q->tx_vq, elem, 0);
|
|
g_free(elem);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (n->has_vnet_hdr) {
|
|
if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
|
|
n->guest_hdr_len) {
|
|
virtio_error(vdev, "virtio-net header incorrect");
|
|
virtqueue_detach_element(q->tx_vq, elem, 0);
|
|
g_free(elem);
|
|
return -EINVAL;
|
|
}
|
|
if (n->needs_vnet_hdr_swap) {
|
|
virtio_net_hdr_swap(vdev, (void *) &mhdr);
|
|
sg2[0].iov_base = &mhdr;
|
|
sg2[0].iov_len = n->guest_hdr_len;
|
|
out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
|
|
out_sg, out_num,
|
|
n->guest_hdr_len, -1);
|
|
if (out_num == VIRTQUEUE_MAX_SIZE) {
|
|
goto drop;
|
|
}
|
|
out_num += 1;
|
|
out_sg = sg2;
|
|
}
|
|
}
|
|
/*
|
|
* If host wants to see the guest header as is, we can
|
|
* pass it on unchanged. Otherwise, copy just the parts
|
|
* that host is interested in.
|
|
*/
|
|
assert(n->host_hdr_len <= n->guest_hdr_len);
|
|
if (n->host_hdr_len != n->guest_hdr_len) {
|
|
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
|
|
out_sg, out_num,
|
|
0, n->host_hdr_len);
|
|
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
|
|
out_sg, out_num,
|
|
n->guest_hdr_len, -1);
|
|
out_num = sg_num;
|
|
out_sg = sg;
|
|
}
|
|
|
|
ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
|
|
out_sg, out_num, virtio_net_tx_complete);
|
|
if (ret == 0) {
|
|
virtio_queue_set_notification(q->tx_vq, 0);
|
|
q->async_tx.elem = elem;
|
|
return -EBUSY;
|
|
}
|
|
|
|
drop:
|
|
virtqueue_push(q->tx_vq, elem, 0);
|
|
virtio_notify(vdev, q->tx_vq);
|
|
g_free(elem);
|
|
|
|
if (++num_packets >= n->tx_burst) {
|
|
break;
|
|
}
|
|
}
|
|
return num_packets;
|
|
}
|
|
|
|
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
|
|
|
|
if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
|
|
virtio_net_drop_tx_queue_data(vdev, vq);
|
|
return;
|
|
}
|
|
|
|
/* This happens when device was stopped but VCPU wasn't. */
|
|
if (!vdev->vm_running) {
|
|
q->tx_waiting = 1;
|
|
return;
|
|
}
|
|
|
|
if (q->tx_waiting) {
|
|
virtio_queue_set_notification(vq, 1);
|
|
timer_del(q->tx_timer);
|
|
q->tx_waiting = 0;
|
|
if (virtio_net_flush_tx(q) == -EINVAL) {
|
|
return;
|
|
}
|
|
} else {
|
|
timer_mod(q->tx_timer,
|
|
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
|
|
q->tx_waiting = 1;
|
|
virtio_queue_set_notification(vq, 0);
|
|
}
|
|
}
|
|
|
|
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
|
|
|
|
if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
|
|
virtio_net_drop_tx_queue_data(vdev, vq);
|
|
return;
|
|
}
|
|
|
|
if (unlikely(q->tx_waiting)) {
|
|
return;
|
|
}
|
|
q->tx_waiting = 1;
|
|
/* This happens when device was stopped but VCPU wasn't. */
|
|
if (!vdev->vm_running) {
|
|
return;
|
|
}
|
|
virtio_queue_set_notification(vq, 0);
|
|
qemu_bh_schedule(q->tx_bh);
|
|
}
|
|
|
|
static void virtio_net_tx_timer(void *opaque)
|
|
{
|
|
VirtIONetQueue *q = opaque;
|
|
VirtIONet *n = q->n;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
/* This happens when device was stopped but BH wasn't. */
|
|
if (!vdev->vm_running) {
|
|
/* Make sure tx waiting is set, so we'll run when restarted. */
|
|
assert(q->tx_waiting);
|
|
return;
|
|
}
|
|
|
|
q->tx_waiting = 0;
|
|
|
|
/* Just in case the driver is not ready on more */
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
|
return;
|
|
}
|
|
|
|
virtio_queue_set_notification(q->tx_vq, 1);
|
|
virtio_net_flush_tx(q);
|
|
}
|
|
|
|
static void virtio_net_tx_bh(void *opaque)
|
|
{
|
|
VirtIONetQueue *q = opaque;
|
|
VirtIONet *n = q->n;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
int32_t ret;
|
|
|
|
/* This happens when device was stopped but BH wasn't. */
|
|
if (!vdev->vm_running) {
|
|
/* Make sure tx waiting is set, so we'll run when restarted. */
|
|
assert(q->tx_waiting);
|
|
return;
|
|
}
|
|
|
|
q->tx_waiting = 0;
|
|
|
|
/* Just in case the driver is not ready on more */
|
|
if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
|
|
return;
|
|
}
|
|
|
|
ret = virtio_net_flush_tx(q);
|
|
if (ret == -EBUSY || ret == -EINVAL) {
|
|
return; /* Notification re-enable handled by tx_complete or device
|
|
* broken */
|
|
}
|
|
|
|
/* If we flush a full burst of packets, assume there are
|
|
* more coming and immediately reschedule */
|
|
if (ret >= n->tx_burst) {
|
|
qemu_bh_schedule(q->tx_bh);
|
|
q->tx_waiting = 1;
|
|
return;
|
|
}
|
|
|
|
/* If less than a full burst, re-enable notification and flush
|
|
* anything that may have come in while we weren't looking. If
|
|
* we find something, assume the guest is still active and reschedule */
|
|
virtio_queue_set_notification(q->tx_vq, 1);
|
|
ret = virtio_net_flush_tx(q);
|
|
if (ret == -EINVAL) {
|
|
return;
|
|
} else if (ret > 0) {
|
|
virtio_queue_set_notification(q->tx_vq, 0);
|
|
qemu_bh_schedule(q->tx_bh);
|
|
q->tx_waiting = 1;
|
|
}
|
|
}
|
|
|
|
static void virtio_net_add_queue(VirtIONet *n, int index)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
|
|
n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
|
|
virtio_net_handle_rx);
|
|
|
|
if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
|
|
n->vqs[index].tx_vq =
|
|
virtio_add_queue(vdev, n->net_conf.tx_queue_size,
|
|
virtio_net_handle_tx_timer);
|
|
n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
|
|
virtio_net_tx_timer,
|
|
&n->vqs[index]);
|
|
} else {
|
|
n->vqs[index].tx_vq =
|
|
virtio_add_queue(vdev, n->net_conf.tx_queue_size,
|
|
virtio_net_handle_tx_bh);
|
|
n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
|
|
}
|
|
|
|
n->vqs[index].tx_waiting = 0;
|
|
n->vqs[index].n = n;
|
|
}
|
|
|
|
static void virtio_net_del_queue(VirtIONet *n, int index)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
VirtIONetQueue *q = &n->vqs[index];
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, index);
|
|
|
|
qemu_purge_queued_packets(nc);
|
|
|
|
virtio_del_queue(vdev, index * 2);
|
|
if (q->tx_timer) {
|
|
timer_del(q->tx_timer);
|
|
timer_free(q->tx_timer);
|
|
q->tx_timer = NULL;
|
|
} else {
|
|
qemu_bh_delete(q->tx_bh);
|
|
q->tx_bh = NULL;
|
|
}
|
|
q->tx_waiting = 0;
|
|
virtio_del_queue(vdev, index * 2 + 1);
|
|
}
|
|
|
|
static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
int old_num_queues = virtio_get_num_queues(vdev);
|
|
int new_num_queues = new_max_queues * 2 + 1;
|
|
int i;
|
|
|
|
assert(old_num_queues >= 3);
|
|
assert(old_num_queues % 2 == 1);
|
|
|
|
if (old_num_queues == new_num_queues) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We always need to remove and add ctrl vq if
|
|
* old_num_queues != new_num_queues. Remove ctrl_vq first,
|
|
* and then we only enter one of the following too loops.
|
|
*/
|
|
virtio_del_queue(vdev, old_num_queues - 1);
|
|
|
|
for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
|
|
/* new_num_queues < old_num_queues */
|
|
virtio_net_del_queue(n, i / 2);
|
|
}
|
|
|
|
for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
|
|
/* new_num_queues > old_num_queues */
|
|
virtio_net_add_queue(n, i / 2);
|
|
}
|
|
|
|
/* add ctrl_vq last */
|
|
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
|
|
}
|
|
|
|
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
|
|
{
|
|
int max = multiqueue ? n->max_queues : 1;
|
|
|
|
n->multiqueue = multiqueue;
|
|
virtio_net_change_num_queues(n, max);
|
|
|
|
virtio_net_set_queues(n);
|
|
}
|
|
|
|
static int virtio_net_post_load_device(void *opaque, int version_id)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(n);
|
|
int i, link_down;
|
|
|
|
virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
|
|
virtio_vdev_has_feature(vdev,
|
|
VIRTIO_F_VERSION_1));
|
|
|
|
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
|
if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
|
|
n->mac_table.in_use = 0;
|
|
}
|
|
|
|
if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
|
|
n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
|
|
}
|
|
|
|
if (peer_has_vnet_hdr(n)) {
|
|
virtio_net_apply_guest_offloads(n);
|
|
}
|
|
|
|
virtio_net_set_queues(n);
|
|
|
|
/* Find the first multicast entry in the saved MAC filter */
|
|
for (i = 0; i < n->mac_table.in_use; i++) {
|
|
if (n->mac_table.macs[i * ETH_ALEN] & 1) {
|
|
break;
|
|
}
|
|
}
|
|
n->mac_table.first_multi = i;
|
|
|
|
/* nc.link_down can't be migrated, so infer link_down according
|
|
* to link status bit in n->status */
|
|
link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
qemu_get_subqueue(n->nic, i)->link_down = link_down;
|
|
}
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
|
|
virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
|
|
n->announce_counter = SELF_ANNOUNCE_ROUNDS;
|
|
timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* tx_waiting field of a VirtIONetQueue */
|
|
static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
|
|
.name = "virtio-net-queue-tx_waiting",
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static bool max_queues_gt_1(void *opaque, int version_id)
|
|
{
|
|
return VIRTIO_NET(opaque)->max_queues > 1;
|
|
}
|
|
|
|
static bool has_ctrl_guest_offloads(void *opaque, int version_id)
|
|
{
|
|
return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
|
|
VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
|
|
}
|
|
|
|
static bool mac_table_fits(void *opaque, int version_id)
|
|
{
|
|
return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
|
|
}
|
|
|
|
static bool mac_table_doesnt_fit(void *opaque, int version_id)
|
|
{
|
|
return !mac_table_fits(opaque, version_id);
|
|
}
|
|
|
|
/* This temporary type is shared by all the WITH_TMP methods
|
|
* although only some fields are used by each.
|
|
*/
|
|
struct VirtIONetMigTmp {
|
|
VirtIONet *parent;
|
|
VirtIONetQueue *vqs_1;
|
|
uint16_t curr_queues_1;
|
|
uint8_t has_ufo;
|
|
uint32_t has_vnet_hdr;
|
|
};
|
|
|
|
/* The 2nd and subsequent tx_waiting flags are loaded later than
|
|
* the 1st entry in the queues and only if there's more than one
|
|
* entry. We use the tmp mechanism to calculate a temporary
|
|
* pointer and count and also validate the count.
|
|
*/
|
|
|
|
static int virtio_net_tx_waiting_pre_save(void *opaque)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
tmp->vqs_1 = tmp->parent->vqs + 1;
|
|
tmp->curr_queues_1 = tmp->parent->curr_queues - 1;
|
|
if (tmp->parent->curr_queues == 0) {
|
|
tmp->curr_queues_1 = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_net_tx_waiting_pre_load(void *opaque)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
/* Reuse the pointer setup from save */
|
|
virtio_net_tx_waiting_pre_save(opaque);
|
|
|
|
if (tmp->parent->curr_queues > tmp->parent->max_queues) {
|
|
error_report("virtio-net: curr_queues %x > max_queues %x",
|
|
tmp->parent->curr_queues, tmp->parent->max_queues);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0; /* all good */
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_net_tx_waiting = {
|
|
.name = "virtio-net-tx_waiting",
|
|
.pre_load = virtio_net_tx_waiting_pre_load,
|
|
.pre_save = virtio_net_tx_waiting_pre_save,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
|
|
curr_queues_1,
|
|
vmstate_virtio_net_queue_tx_waiting,
|
|
struct VirtIONetQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
/* the 'has_ufo' flag is just tested; if the incoming stream has the
|
|
* flag set we need to check that we have it
|
|
*/
|
|
static int virtio_net_ufo_post_load(void *opaque, int version_id)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
|
|
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_net_ufo_pre_save(void *opaque)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
tmp->has_ufo = tmp->parent->has_ufo;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_net_has_ufo = {
|
|
.name = "virtio-net-ufo",
|
|
.post_load = virtio_net_ufo_post_load,
|
|
.pre_save = virtio_net_ufo_pre_save,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
/* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
|
|
* flag set we need to check that we have it
|
|
*/
|
|
static int virtio_net_vnet_post_load(void *opaque, int version_id)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
|
|
error_report("virtio-net: saved image requires vnet_hdr=on");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_net_vnet_pre_save(void *opaque)
|
|
{
|
|
struct VirtIONetMigTmp *tmp = opaque;
|
|
|
|
tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_net_has_vnet = {
|
|
.name = "virtio-net-vnet",
|
|
.post_load = virtio_net_vnet_post_load,
|
|
.pre_save = virtio_net_vnet_pre_save,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_net_device = {
|
|
.name = "virtio-net-device",
|
|
.version_id = VIRTIO_NET_VM_VERSION,
|
|
.minimum_version_id = VIRTIO_NET_VM_VERSION,
|
|
.post_load = virtio_net_post_load_device,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
|
|
VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
|
|
vmstate_virtio_net_queue_tx_waiting,
|
|
VirtIONetQueue),
|
|
VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
|
|
VMSTATE_UINT16(status, VirtIONet),
|
|
VMSTATE_UINT8(promisc, VirtIONet),
|
|
VMSTATE_UINT8(allmulti, VirtIONet),
|
|
VMSTATE_UINT32(mac_table.in_use, VirtIONet),
|
|
|
|
/* Guarded pair: If it fits we load it, else we throw it away
|
|
* - can happen if source has a larger MAC table.; post-load
|
|
* sets flags in this case.
|
|
*/
|
|
VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
|
|
0, mac_table_fits, mac_table.in_use,
|
|
ETH_ALEN),
|
|
VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
|
|
mac_table.in_use, ETH_ALEN),
|
|
|
|
/* Note: This is an array of uint32's that's always been saved as a
|
|
* buffer; hold onto your endiannesses; it's actually used as a bitmap
|
|
* but based on the uint.
|
|
*/
|
|
VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
|
|
VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
|
|
vmstate_virtio_net_has_vnet),
|
|
VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
|
|
VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
|
|
VMSTATE_UINT8(alluni, VirtIONet),
|
|
VMSTATE_UINT8(nomulti, VirtIONet),
|
|
VMSTATE_UINT8(nouni, VirtIONet),
|
|
VMSTATE_UINT8(nobcast, VirtIONet),
|
|
VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
|
|
vmstate_virtio_net_has_ufo),
|
|
VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0,
|
|
vmstate_info_uint16_equal, uint16_t),
|
|
VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1),
|
|
VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
|
|
vmstate_virtio_net_tx_waiting),
|
|
VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
|
|
has_ctrl_guest_offloads),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
};
|
|
|
|
static NetClientInfo net_virtio_info = {
|
|
.type = NET_CLIENT_DRIVER_NIC,
|
|
.size = sizeof(NICState),
|
|
.can_receive = virtio_net_can_receive,
|
|
.receive = virtio_net_receive,
|
|
.link_status_changed = virtio_net_set_link_status,
|
|
.query_rx_filter = virtio_net_query_rxfilter,
|
|
};
|
|
|
|
static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
|
|
assert(n->vhost_started);
|
|
return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
|
|
}
|
|
|
|
static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
|
|
bool mask)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(vdev);
|
|
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
|
|
assert(n->vhost_started);
|
|
vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
|
|
vdev, idx, mask);
|
|
}
|
|
|
|
static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
|
|
{
|
|
int i, config_size = 0;
|
|
virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
|
|
|
|
for (i = 0; feature_sizes[i].flags != 0; i++) {
|
|
if (host_features & feature_sizes[i].flags) {
|
|
config_size = MAX(feature_sizes[i].end, config_size);
|
|
}
|
|
}
|
|
n->config_size = config_size;
|
|
}
|
|
|
|
void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
|
|
const char *type)
|
|
{
|
|
/*
|
|
* The name can be NULL, the netclient name will be type.x.
|
|
*/
|
|
assert(type != NULL);
|
|
|
|
g_free(n->netclient_name);
|
|
g_free(n->netclient_type);
|
|
n->netclient_name = g_strdup(name);
|
|
n->netclient_type = g_strdup(type);
|
|
}
|
|
|
|
static void virtio_net_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIONet *n = VIRTIO_NET(dev);
|
|
NetClientState *nc;
|
|
int i;
|
|
|
|
if (n->net_conf.mtu) {
|
|
n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
|
|
}
|
|
|
|
if (n->net_conf.duplex_str) {
|
|
if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
|
|
n->net_conf.duplex = DUPLEX_HALF;
|
|
} else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
|
|
n->net_conf.duplex = DUPLEX_FULL;
|
|
} else {
|
|
error_setg(errp, "'duplex' must be 'half' or 'full'");
|
|
}
|
|
n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
|
|
} else {
|
|
n->net_conf.duplex = DUPLEX_UNKNOWN;
|
|
}
|
|
|
|
if (n->net_conf.speed < SPEED_UNKNOWN) {
|
|
error_setg(errp, "'speed' must be between 0 and INT_MAX");
|
|
} else if (n->net_conf.speed >= 0) {
|
|
n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
|
|
}
|
|
|
|
virtio_net_set_config_size(n, n->host_features);
|
|
virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
|
|
|
|
/*
|
|
* We set a lower limit on RX queue size to what it always was.
|
|
* Guests that want a smaller ring can always resize it without
|
|
* help from us (using virtio 1 and up).
|
|
*/
|
|
if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
|
|
n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
|
|
!is_power_of_2(n->net_conf.rx_queue_size)) {
|
|
error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
|
|
"must be a power of 2 between %d and %d.",
|
|
n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
|
|
VIRTQUEUE_MAX_SIZE);
|
|
virtio_cleanup(vdev);
|
|
return;
|
|
}
|
|
|
|
if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
|
|
n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE ||
|
|
!is_power_of_2(n->net_conf.tx_queue_size)) {
|
|
error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
|
|
"must be a power of 2 between %d and %d",
|
|
n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
|
|
VIRTQUEUE_MAX_SIZE);
|
|
virtio_cleanup(vdev);
|
|
return;
|
|
}
|
|
|
|
n->max_queues = MAX(n->nic_conf.peers.queues, 1);
|
|
if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
|
|
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
|
|
"must be a positive integer less than %d.",
|
|
n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
|
|
virtio_cleanup(vdev);
|
|
return;
|
|
}
|
|
n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
|
|
n->curr_queues = 1;
|
|
n->tx_timeout = n->net_conf.txtimer;
|
|
|
|
if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
|
|
&& strcmp(n->net_conf.tx, "bh")) {
|
|
error_report("virtio-net: "
|
|
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
|
n->net_conf.tx);
|
|
error_report("Defaulting to \"bh\"");
|
|
}
|
|
|
|
n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
|
|
n->net_conf.tx_queue_size);
|
|
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
virtio_net_add_queue(n, i);
|
|
}
|
|
|
|
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
|
|
qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
|
|
memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
|
|
n->status = VIRTIO_NET_S_LINK_UP;
|
|
n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
|
|
virtio_net_announce_timer, n);
|
|
|
|
if (n->netclient_type) {
|
|
/*
|
|
* Happen when virtio_net_set_netclient_name has been called.
|
|
*/
|
|
n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
|
|
n->netclient_type, n->netclient_name, n);
|
|
} else {
|
|
n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
|
|
object_get_typename(OBJECT(dev)), dev->id, n);
|
|
}
|
|
|
|
peer_test_vnet_hdr(n);
|
|
if (peer_has_vnet_hdr(n)) {
|
|
for (i = 0; i < n->max_queues; i++) {
|
|
qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
|
|
}
|
|
n->host_hdr_len = sizeof(struct virtio_net_hdr);
|
|
} else {
|
|
n->host_hdr_len = 0;
|
|
}
|
|
|
|
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
|
|
|
|
n->vqs[0].tx_waiting = 0;
|
|
n->tx_burst = n->net_conf.txburst;
|
|
virtio_net_set_mrg_rx_bufs(n, 0, 0);
|
|
n->promisc = 1; /* for compatibility */
|
|
|
|
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
|
|
|
|
n->vlans = g_malloc0(MAX_VLAN >> 3);
|
|
|
|
nc = qemu_get_queue(n->nic);
|
|
nc->rxfilter_notify_enabled = 1;
|
|
|
|
n->qdev = dev;
|
|
}
|
|
|
|
static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtIONet *n = VIRTIO_NET(dev);
|
|
int i, max_queues;
|
|
|
|
/* This will stop vhost backend if appropriate. */
|
|
virtio_net_set_status(vdev, 0);
|
|
|
|
g_free(n->netclient_name);
|
|
n->netclient_name = NULL;
|
|
g_free(n->netclient_type);
|
|
n->netclient_type = NULL;
|
|
|
|
g_free(n->mac_table.macs);
|
|
g_free(n->vlans);
|
|
|
|
max_queues = n->multiqueue ? n->max_queues : 1;
|
|
for (i = 0; i < max_queues; i++) {
|
|
virtio_net_del_queue(n, i);
|
|
}
|
|
|
|
timer_del(n->announce_timer);
|
|
timer_free(n->announce_timer);
|
|
g_free(n->vqs);
|
|
qemu_del_nic(n->nic);
|
|
virtio_cleanup(vdev);
|
|
}
|
|
|
|
static void virtio_net_instance_init(Object *obj)
|
|
{
|
|
VirtIONet *n = VIRTIO_NET(obj);
|
|
|
|
/*
|
|
* The default config_size is sizeof(struct virtio_net_config).
|
|
* Can be overriden with virtio_net_set_config_size.
|
|
*/
|
|
n->config_size = sizeof(struct virtio_net_config);
|
|
device_add_bootindex_property(obj, &n->nic_conf.bootindex,
|
|
"bootindex", "/ethernet-phy@0",
|
|
DEVICE(n), NULL);
|
|
}
|
|
|
|
static int virtio_net_pre_save(void *opaque)
|
|
{
|
|
VirtIONet *n = opaque;
|
|
|
|
/* At this point, backend must be stopped, otherwise
|
|
* it might keep writing to memory. */
|
|
assert(!n->vhost_started);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_net = {
|
|
.name = "virtio-net",
|
|
.minimum_version_id = VIRTIO_NET_VM_VERSION,
|
|
.version_id = VIRTIO_NET_VM_VERSION,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_VIRTIO_DEVICE,
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.pre_save = virtio_net_pre_save,
|
|
};
|
|
|
|
static Property virtio_net_properties[] = {
|
|
DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CSUM, true),
|
|
DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_CSUM, true),
|
|
DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
|
|
DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_TSO4, true),
|
|
DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_TSO6, true),
|
|
DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_ECN, true),
|
|
DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_UFO, true),
|
|
DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
|
|
VIRTIO_NET_F_GUEST_ANNOUNCE, true),
|
|
DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
|
|
VIRTIO_NET_F_HOST_TSO4, true),
|
|
DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
|
|
VIRTIO_NET_F_HOST_TSO6, true),
|
|
DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
|
|
VIRTIO_NET_F_HOST_ECN, true),
|
|
DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
|
|
VIRTIO_NET_F_HOST_UFO, true),
|
|
DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
|
|
VIRTIO_NET_F_MRG_RXBUF, true),
|
|
DEFINE_PROP_BIT64("status", VirtIONet, host_features,
|
|
VIRTIO_NET_F_STATUS, true),
|
|
DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_VQ, true),
|
|
DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_RX, true),
|
|
DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_VLAN, true),
|
|
DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_RX_EXTRA, true),
|
|
DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_MAC_ADDR, true),
|
|
DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
|
|
VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
|
|
DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
|
|
DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
|
|
DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
|
|
TX_TIMER_INTERVAL),
|
|
DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
|
|
DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
|
|
DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
|
|
VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
|
|
DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
|
|
VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
|
|
DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
|
|
DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
|
|
true),
|
|
DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
|
|
DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_net_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
|
|
dc->props = virtio_net_properties;
|
|
dc->vmsd = &vmstate_virtio_net;
|
|
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
|
|
vdc->realize = virtio_net_device_realize;
|
|
vdc->unrealize = virtio_net_device_unrealize;
|
|
vdc->get_config = virtio_net_get_config;
|
|
vdc->set_config = virtio_net_set_config;
|
|
vdc->get_features = virtio_net_get_features;
|
|
vdc->set_features = virtio_net_set_features;
|
|
vdc->bad_features = virtio_net_bad_features;
|
|
vdc->reset = virtio_net_reset;
|
|
vdc->set_status = virtio_net_set_status;
|
|
vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
|
|
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
|
|
vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
|
|
vdc->vmsd = &vmstate_virtio_net_device;
|
|
}
|
|
|
|
static const TypeInfo virtio_net_info = {
|
|
.name = TYPE_VIRTIO_NET,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIONet),
|
|
.instance_init = virtio_net_instance_init,
|
|
.class_init = virtio_net_class_init,
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_net_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|