> +static int vub_virtio_process_req(VubDev *vdev_blk,
> + VuVirtq *vq)
> +{
> + VugDev *gdev = &vdev_blk->parent;
> + VuDev *vu_dev = &gdev->parent;
> + VuVirtqElement *elem;
> + uint32_t type;
> + unsigned in_num;
> + unsigned out_num;
> + VubReq *req;
> +
> + elem = vu_queue_pop(vu_dev, vq, sizeof(VuVirtqElement));
> + if (!elem) {
> + return -1;
> + }
> +
> + /* refer to hw/block/virtio_blk.c */
> + if (elem->out_num < 1 || elem->in_num < 1) {
> + fprintf(stderr, "virtio-blk request missing headers\n");
> + free(elem);
> + return -1;
> + }
> +
> + req = g_new0(VubReq, 1);
> + req->vdev_blk = vdev_blk;
> + req->vq = vq;
> + req->elem = elem;
> +
> + in_num = elem->in_num;
> + out_num = elem->out_num;
> +
> + /* don't support VIRTIO_F_ANY_LAYOUT and virtio 1.0 only */
> + if (elem->out_sg[0].iov_len < sizeof(struct virtio_blk_outhdr)) {
> + fprintf(stderr, "Invalid outhdr size\n");
> + goto err;
> + }
QEMU has iov_discard_front() and iov_discard_back(). They make it
pretty easy to support VIRTIO_F_ANY_LAYOUT. If you have time, please
consider adding it to libvhost-user, but it's not a requirement for this
patch series.
> + req->out = (struct virtio_blk_outhdr *)elem->out_sg[0].iov_base;
> + out_num--;
> +
> + if (elem->in_sg[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
> + fprintf(stderr, "Invalid inhdr size\n");
> + goto err;
> + }
> + req->in = (struct virtio_blk_inhdr *)elem->in_sg[in_num - 1].iov_base;
> + in_num--;
> +
> + type = le32toh(req->out->type);
Endianness is more complicated if you want to support both VIRTIO 1.0
and Legacy (0.9.7). I guess it's okay to make libvhost-user code only
support VIRTIO 1.0.
> +static void vub_queue_set_started(VuDev *vu_dev, int idx, bool started)
> +{
> + VuVirtq *vq;
> +
> + assert(vu_dev);
> +
> + if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
> + fprintf(stderr, "VQ Index out of range: %d\n", idx);
> + vub_panic_cb(vu_dev, NULL);
> + return;
> + }
Is it necessary to check num_queues? The vhost-user master should not
be able to enable idx >= num_queues.
signature.asc
Description: PGP signature
