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virtio: allow extra context per descriptor

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Allow extra context per descriptor. To avoid slow down for data path,
this disables use of indirect descriptors for this vq.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2017-02-07 06:15:13 +02:00
parent 0a12ae4024
commit 5a08b04f63
2 changed files with 66 additions and 13 deletions
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9
include/linux/virtio.h
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@ -44,6 +44,12 @@ int virtqueue_add_inbuf(struct virtqueue *vq,
void *data,
gfp_t gfp);
int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
struct scatterlist sg[], unsigned int num,
void *data,
void *ctx,
gfp_t gfp);
int virtqueue_add_sgs(struct virtqueue *vq,
struct scatterlist *sgs[],
unsigned int out_sgs,
@ -59,6 +65,9 @@ bool virtqueue_notify(struct virtqueue *vq);
void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
void *virtqueue_get_buf_ctx(struct virtqueue *vq, unsigned int *len,
void **ctx);
void virtqueue_disable_cb(struct virtqueue *vq);
bool virtqueue_enable_cb(struct virtqueue *vq);