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virtio_ring: virtqueue_add_outbuf / virtqueue_add_inbuf.

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These are specialized versions of virtqueue_add_buf(), which cover
over 80% of cases and are far clearer.

In particular, the scatterlists passed to these functions don't have
to be clean (ie. we ignore end markers).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2013-03-20 15:44:26 +10:30
parent 13816c768d
commit 282edb3649
2 changed files with 54 additions and 0 deletions
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10
include/linux/virtio.h
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@@ -41,6 +41,16 @@ int virtqueue_add_buf(struct virtqueue *vq,
void *data,
gfp_t gfp);
int virtqueue_add_outbuf(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
gfp_t gfp);
int virtqueue_add_inbuf(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
gfp_t gfp);
int virtqueue_add_sgs(struct virtqueue *vq,
struct scatterlist *sgs[],
unsigned int out_sgs,