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virtio: document ENOSPC

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drivers handle ENOSPC specially since it's an error one can
get from a working VQ. Document the semantics.

Message-Id: <2e6ec46b8d5e6755be291cec8e2ec57ef286e97b.1748356035.git.mst@redhat.com>
Reported-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
This commit is contained in:
Michael S. Tsirkin 2025-05-27 10:26:29 -04:00
parent 2507789a72
commit 482bd84f1f
1 changed files with 4 additions and 0 deletions
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4
drivers/virtio/virtio_ring.c
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@ -2296,6 +2296,10 @@ static inline int virtqueue_add(struct virtqueue *_vq,
* at the same time (except where noted).
*
* Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO).
*
* NB: ENOSPC is a special code that is only returned on an attempt to add a
* buffer to a full VQ. It indicates that some buffers are outstanding and that
* the operation can be retried after some buffers have been used.
*/
int virtqueue_add_sgs(struct virtqueue *_vq,
struct scatterlist *sgs[],