--- /dev/null
+/*
+ * vhost-net support
+ *
+ * Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ * Michael S. Tsirkin <mst@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "net/net.h"
+#include "net/tap.h"
+#include "net/vhost-user.h"
+
+#include "hw/virtio/virtio-net.h"
+#include "net/vhost_net.h"
+#include "qemu/error-report.h"
+
+#include "config.h"
+
+#ifdef CONFIG_VHOST_NET
+#include <linux/vhost.h>
+#include <sys/socket.h>
+#include <linux/kvm.h>
+#include <fcntl.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+
+#include "standard-headers/linux/virtio_ring.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/virtio-bus.h"
+#include "hw/virtio/virtio-access.h"
+
+struct vhost_net {
+ struct vhost_dev dev;
+ struct vhost_virtqueue vqs[2];
+ int backend;
+ NetClientState *nc;
+};
+
+/* Features supported by host kernel. */
+static const int kernel_feature_bits[] = {
+ VIRTIO_F_NOTIFY_ON_EMPTY,
+ VIRTIO_RING_F_INDIRECT_DESC,
+ VIRTIO_RING_F_EVENT_IDX,
+ VIRTIO_NET_F_MRG_RXBUF,
+ VIRTIO_F_VERSION_1,
+ VHOST_INVALID_FEATURE_BIT
+};
+
+/* Features supported by others. */
+static const int user_feature_bits[] = {
+ VIRTIO_F_NOTIFY_ON_EMPTY,
+ VIRTIO_RING_F_INDIRECT_DESC,
+ VIRTIO_RING_F_EVENT_IDX,
+
+ VIRTIO_F_ANY_LAYOUT,
+ VIRTIO_F_VERSION_1,
+ VIRTIO_NET_F_CSUM,
+ VIRTIO_NET_F_GUEST_CSUM,
+ VIRTIO_NET_F_GSO,
+ VIRTIO_NET_F_GUEST_TSO4,
+ VIRTIO_NET_F_GUEST_TSO6,
+ VIRTIO_NET_F_GUEST_ECN,
+ VIRTIO_NET_F_GUEST_UFO,
+ VIRTIO_NET_F_HOST_TSO4,
+ VIRTIO_NET_F_HOST_TSO6,
+ VIRTIO_NET_F_HOST_ECN,
+ VIRTIO_NET_F_HOST_UFO,
+ VIRTIO_NET_F_MRG_RXBUF,
+ VIRTIO_NET_F_STATUS,
+ VIRTIO_NET_F_CTRL_VQ,
+ VIRTIO_NET_F_CTRL_RX,
+ VIRTIO_NET_F_CTRL_VLAN,
+ VIRTIO_NET_F_CTRL_RX_EXTRA,
+ VIRTIO_NET_F_CTRL_MAC_ADDR,
+ VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
+
+ VIRTIO_NET_F_MQ,
+
+ VHOST_INVALID_FEATURE_BIT
+};
+
+static const int *vhost_net_get_feature_bits(struct vhost_net *net)
+{
+ const int *feature_bits = 0;
+
+ switch (net->nc->info->type) {
+ case NET_CLIENT_OPTIONS_KIND_TAP:
+ feature_bits = kernel_feature_bits;
+ break;
+ case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
+ feature_bits = user_feature_bits;
+ break;
+ default:
+ error_report("Feature bits not defined for this type: %d",
+ net->nc->info->type);
+ break;
+ }
+
+ return feature_bits;
+}
+
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
+{
+ return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
+ features);
+}
+
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
+{
+ net->dev.acked_features = net->dev.backend_features;
+ vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
+}
+
+static int vhost_net_get_fd(NetClientState *backend)
+{
+ switch (backend->info->type) {
+ case NET_CLIENT_OPTIONS_KIND_TAP:
+ return tap_get_fd(backend);
+ default:
+ fprintf(stderr, "vhost-net requires tap backend\n");
+ return -EBADFD;
+ }
+}
+
+struct vhost_net *vhost_net_init(VhostNetOptions *options)
+{
+ int r;
+ bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
+ struct vhost_net *net = g_malloc(sizeof *net);
+
+ if (!options->net_backend) {
+ fprintf(stderr, "vhost-net requires net backend to be setup\n");
+ goto fail;
+ }
+
+ if (backend_kernel) {
+ r = vhost_net_get_fd(options->net_backend);
+ if (r < 0) {
+ goto fail;
+ }
+ net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
+ ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
+ net->backend = r;
+ } else {
+ net->dev.backend_features = 0;
+ net->backend = -1;
+ }
+ net->nc = options->net_backend;
+
+ net->dev.nvqs = 2;
+ net->dev.vqs = net->vqs;
+
+ r = vhost_dev_init(&net->dev, options->opaque,
+ options->backend_type);
+ if (r < 0) {
+ goto fail;
+ }
+ if (backend_kernel) {
+ if (!qemu_has_vnet_hdr_len(options->net_backend,
+ sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
+ net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
+ }
+ if (~net->dev.features & net->dev.backend_features) {
+ fprintf(stderr, "vhost lacks feature mask %" PRIu64
+ " for backend\n",
+ (uint64_t)(~net->dev.features & net->dev.backend_features));
+ vhost_dev_cleanup(&net->dev);
+ goto fail;
+ }
+ }
+ /* Set sane init value. Override when guest acks. */
+ vhost_net_ack_features(net, 0);
+ return net;
+fail:
+ g_free(net);
+ return NULL;
+}
+
+static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
+{
+ net->dev.vq_index = vq_index;
+}
+
+static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
+ bool set)
+{
+ int r = 0;
+
+ if (virtio_has_feature(dev, VIRTIO_F_VERSION_1) ||
+ (virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
+ r = qemu_set_vnet_le(peer, set);
+ if (r) {
+ error_report("backend does not support LE vnet headers");
+ }
+ } else if (virtio_legacy_is_cross_endian(dev)) {
+ r = qemu_set_vnet_be(peer, set);
+ if (r) {
+ error_report("backend does not support BE vnet headers");
+ }
+ }
+
+ return r;
+}
+
+static int vhost_net_start_one(struct vhost_net *net,
+ VirtIODevice *dev)
+{
+ struct vhost_vring_file file = { };
+ int r;
+
+ net->dev.nvqs = 2;
+ net->dev.vqs = net->vqs;
+
+ r = vhost_dev_enable_notifiers(&net->dev, dev);
+ if (r < 0) {
+ goto fail_notifiers;
+ }
+
+ r = vhost_dev_start(&net->dev, dev);
+ if (r < 0) {
+ goto fail_start;
+ }
+
+ if (net->nc->info->poll) {
+ net->nc->info->poll(net->nc, false);
+ }
+
+ if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+ qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
+ file.fd = net->backend;
+ for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+ const VhostOps *vhost_ops = net->dev.vhost_ops;
+ r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+ &file);
+ if (r < 0) {
+ r = -errno;
+ goto fail;
+ }
+ }
+ }
+ return 0;
+fail:
+ file.fd = -1;
+ if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+ while (file.index-- > 0) {
+ const VhostOps *vhost_ops = net->dev.vhost_ops;
+ int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+ &file);
+ assert(r >= 0);
+ }
+ }
+ if (net->nc->info->poll) {
+ net->nc->info->poll(net->nc, true);
+ }
+ vhost_dev_stop(&net->dev, dev);
+fail_start:
+ vhost_dev_disable_notifiers(&net->dev, dev);
+fail_notifiers:
+ return r;
+}
+
+static void vhost_net_stop_one(struct vhost_net *net,
+ VirtIODevice *dev)
+{
+ struct vhost_vring_file file = { .fd = -1 };
+
+ if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
+ for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+ const VhostOps *vhost_ops = net->dev.vhost_ops;
+ int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
+ &file);
+ assert(r >= 0);
+ }
+ } else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
+ for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+ const VhostOps *vhost_ops = net->dev.vhost_ops;
+ int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
+ NULL);
+ assert(r >= 0);
+ }
+ }
+ if (net->nc->info->poll) {
+ net->nc->info->poll(net->nc, true);
+ }
+ vhost_dev_stop(&net->dev, dev);
+ vhost_dev_disable_notifiers(&net->dev, dev);
+}
+
+int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
+ int total_queues)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+ VirtioBusState *vbus = VIRTIO_BUS(qbus);
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
+ int r, e, i;
+
+ if (!k->set_guest_notifiers) {
+ error_report("binding does not support guest notifiers");
+ r = -ENOSYS;
+ goto err;
+ }
+
+ r = vhost_net_set_vnet_endian(dev, ncs[0].peer, true);
+ if (r < 0) {
+ goto err;
+ }
+
+ for (i = 0; i < total_queues; i++) {
+ vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
+ }
+
+ r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
+ if (r < 0) {
+ error_report("Error binding guest notifier: %d", -r);
+ goto err_endian;
+ }
+
+ for (i = 0; i < total_queues; i++) {
+ r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
+
+ if (r < 0) {
+ goto err_start;
+ }
+ }
+
+ return 0;
+
+err_start:
+ while (--i >= 0) {
+ vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
+ }
+ e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
+ if (e < 0) {
+ fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
+ fflush(stderr);
+ }
+err_endian:
+ vhost_net_set_vnet_endian(dev, ncs[0].peer, false);
+err:
+ return r;
+}
+
+void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
+ int total_queues)
+{
+ BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
+ VirtioBusState *vbus = VIRTIO_BUS(qbus);
+ VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
+ int i, r;
+
+ for (i = 0; i < total_queues; i++) {
+ vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
+ }
+
+ r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
+ if (r < 0) {
+ fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
+ fflush(stderr);
+ }
+ assert(r >= 0);
+
+ assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 0);
+}
+
+void vhost_net_cleanup(struct vhost_net *net)
+{
+ vhost_dev_cleanup(&net->dev);
+ g_free(net);
+}
+
+bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
+{
+ return vhost_virtqueue_pending(&net->dev, idx);
+}
+
+void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
+ int idx, bool mask)
+{
+ vhost_virtqueue_mask(&net->dev, dev, idx, mask);
+}
+
+VHostNetState *get_vhost_net(NetClientState *nc)
+{
+ VHostNetState *vhost_net = 0;
+
+ if (!nc) {
+ return 0;
+ }
+
+ switch (nc->info->type) {
+ case NET_CLIENT_OPTIONS_KIND_TAP:
+ vhost_net = tap_get_vhost_net(nc);
+ break;
+ case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
+ vhost_net = vhost_user_get_vhost_net(nc);
+ break;
+ default:
+ break;
+ }
+
+ return vhost_net;
+}
+#else
+struct vhost_net *vhost_net_init(VhostNetOptions *options)
+{
+ error_report("vhost-net support is not compiled in");
+ return NULL;
+}
+
+int vhost_net_start(VirtIODevice *dev,
+ NetClientState *ncs,
+ int total_queues)
+{
+ return -ENOSYS;
+}
+void vhost_net_stop(VirtIODevice *dev,
+ NetClientState *ncs,
+ int total_queues)
+{
+}
+
+void vhost_net_cleanup(struct vhost_net *net)
+{
+}
+
+uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
+{
+ return features;
+}
+void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
+{
+}
+
+bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
+{
+ return false;
+}
+
+void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
+ int idx, bool mask)
+{
+}
+
+VHostNetState *get_vhost_net(NetClientState *nc)
+{
+ return 0;
+}
+#endif
Code Review / kvmfornfv.git / blobdiff