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| author | Shirley Ma <mashirle@us.ibm.com> | 2010-01-18 16:45:23 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-02-24 06:52:27 +0300 |
| commit | c021eac4148c16bf53baa0dd14e8ebee6f39dab5 (patch) | |
| tree | 558db2ede74488606614d6e7e277f9914e38fbc1 /include/linux/virtio.h | |
| parent | 69740c8ba878f58bc3c71f74618fc2cd1da990da (diff) | |
| download | linux-c021eac4148c16bf53baa0dd14e8ebee6f39dab5.tar.xz | |
virtio: Add ability to detach unused buffers from vrings
There's currently no way for a virtio driver to ask for unused
buffers, so it has to keep a list itself to reclaim them at shutdown.
This is redundant, since virtio_ring stores that information. So
add a new hook to do this.
Signed-off-by: Shirley Ma <xma@us.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio.h')
| -rw-r--r-- | include/linux/virtio.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 057a2e010758..f508c651e53d 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -51,6 +51,9 @@ struct virtqueue { * This re-enables callbacks; it returns "false" if there are pending * buffers in the queue, to detect a possible race between the driver * checking for more work, and enabling callbacks. + * @detach_unused_buf: detach first unused buffer + * vq: the struct virtqueue we're talking about. + * Returns NULL or the "data" token handed to add_buf * * Locking rules are straightforward: the driver is responsible for * locking. No two operations may be invoked simultaneously, with the exception @@ -71,6 +74,7 @@ struct virtqueue_ops { void (*disable_cb)(struct virtqueue *vq); bool (*enable_cb)(struct virtqueue *vq); + void *(*detach_unused_buf)(struct virtqueue *vq); }; /** |