hw: move virtio devices to hw/ subdirectories

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 328 insertions, 0 deletions

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
new file mode 100644
index 0000000000..8c5384cf76
--- /dev/null
+++ b/hw/net/vhost_net.c
@@ -0,0 +1,328 @@
+/*
+ * 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 "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 <sys/ioctl.h>
+#include <linux/virtio_ring.h>
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+#include <stdio.h>
+
+#include "hw/virtio/vhost.h"
+
+struct vhost_net {
+    struct vhost_dev dev;
+    struct vhost_virtqueue vqs[2];
+    int backend;
+    NetClientState *nc;
+};
+
+unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+{
+    /* Clear features not supported by host kernel. */
+    if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
+        features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+    }
+    if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
+        features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
+    }
+    if (!(net->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
+        features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
+    }
+    if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
+        features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
+    }
+    return features;
+}
+
+void vhost_net_ack_features(struct vhost_net *net, unsigned features)
+{
+    net->dev.acked_features = net->dev.backend_features;
+    if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) {
+        net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
+    }
+    if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
+        net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
+    }
+    if (features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
+        net->dev.acked_features |= (1 << VIRTIO_RING_F_EVENT_IDX);
+    }
+    if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
+        net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
+    }
+}
+
+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(NetClientState *backend, int devfd,
+                                 bool force)
+{
+    int r;
+    struct vhost_net *net = g_malloc(sizeof *net);
+    if (!backend) {
+        fprintf(stderr, "vhost-net requires backend to be setup\n");
+        goto fail;
+    }
+    r = vhost_net_get_fd(backend);
+    if (r < 0) {
+        goto fail;
+    }
+    net->nc = backend;
+    net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
+        (1 << VHOST_NET_F_VIRTIO_NET_HDR);
+    net->backend = r;
+
+    net->dev.nvqs = 2;
+    net->dev.vqs = net->vqs;
+
+    r = vhost_dev_init(&net->dev, devfd, "/dev/vhost-net", force);
+    if (r < 0) {
+        goto fail;
+    }
+    if (!tap_has_vnet_hdr_len(backend,
+                              sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
+        net->dev.features &= ~(1 << 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;
+}
+
+bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
+{
+    return vhost_dev_query(&net->dev, dev);
+}
+
+static int vhost_net_start_one(struct vhost_net *net,
+                               VirtIODevice *dev,
+                               int vq_index)
+{
+    struct vhost_vring_file file = { };
+    int r;
+
+    if (net->dev.started) {
+        return 0;
+    }
+
+    net->dev.nvqs = 2;
+    net->dev.vqs = net->vqs;
+    net->dev.vq_index = vq_index;
+
+    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;
+    }
+
+    net->nc->info->poll(net->nc, false);
+    qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
+    file.fd = net->backend;
+    for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+        r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
+        if (r < 0) {
+            r = -errno;
+            goto fail;
+        }
+    }
+    return 0;
+fail:
+    file.fd = -1;
+    while (file.index-- > 0) {
+        int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
+        assert(r >= 0);
+    }
+    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->dev.started) {
+        return;
+    }
+
+    for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
+        int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
+        assert(r >= 0);
+    }
+    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)
+{
+    int r, i = 0;
+
+    if (!dev->binding->set_guest_notifiers) {
+        error_report("binding does not support guest notifiers");
+        r = -ENOSYS;
+        goto err;
+    }
+
+    for (i = 0; i < total_queues; i++) {
+        r = vhost_net_start_one(tap_get_vhost_net(ncs[i].peer), dev, i * 2);
+
+        if (r < 0) {
+            goto err;
+        }
+    }
+
+    r = dev->binding->set_guest_notifiers(dev->binding_opaque,
+                                          total_queues * 2,
+                                          true);
+    if (r < 0) {
+        error_report("Error binding guest notifier: %d", -r);
+        goto err;
+    }
+
+    return 0;
+
+err:
+    while (--i >= 0) {
+        vhost_net_stop_one(tap_get_vhost_net(ncs[i].peer), dev);
+    }
+    return r;
+}
+
+void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
+                    int total_queues)
+{
+    int i, r;
+
+    r = dev->binding->set_guest_notifiers(dev->binding_opaque,
+                                          total_queues * 2,
+                                          false);
+    if (r < 0) {
+        fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
+        fflush(stderr);
+    }
+    assert(r >= 0);
+
+    for (i = 0; i < total_queues; i++) {
+        vhost_net_stop_one(tap_get_vhost_net(ncs[i].peer), dev);
+    }
+}
+
+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);
+}
+#else
+struct vhost_net *vhost_net_init(NetClientState *backend, int devfd,
+                                 bool force)
+{
+    error_report("vhost-net support is not compiled in");
+    return NULL;
+}
+
+bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
+{
+    return false;
+}
+
+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)
+{
+}
+
+unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
+{
+    return features;
+}
+void vhost_net_ack_features(struct vhost_net *net, unsigned features)
+{
+}
+
+bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
+{
+    return -ENOSYS;
+}
+
+void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
+                              int idx, bool mask)
+{
+}
+#endif