diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2025-05-27 10:26:29 -0400 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2025-08-01 09:11:07 -0400 |
| commit | 482bd84f1fab20ac6c4d112945ae2d1bdb36839f (patch) | |
| tree | 0a9ee636f155d1062c8424a7a8904df790d0a872 | |
| parent | 2507789a724d607fa9e162dcadeb9f51b071fc49 (diff) | |
virtio: document ENOSPC
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>
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 4397392bfef0..f5062061c408 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -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[], |