Commit 29b9f5ef authored by Jason Wang's avatar Jason Wang Committed by Michael S. Tsirkin
Browse files

virtio: introduce virtqueue_discard() 



This patch introduces virtqueue_discard() to discard a descriptor and
unmap the sgs. This will be used by the patch that will discard
descriptor when packet is truncated.

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent ce317461

hw/virtio/virtio.c

+7 −0
Original line number Diff line number Diff line
@@ -267,6 +267,13 @@ static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem, 
                                  0, elem->out_sg[i].iov_len);

}



void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,

                       unsigned int len)

{

    vq->last_avail_idx--;

    virtqueue_unmap_sg(vq, elem, len);

}



void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,

                    unsigned int len, unsigned int idx)

{

include/hw/virtio/virtio.h

+2 −0
Original line number Diff line number Diff line
@@ -146,6 +146,8 @@ void virtio_del_queue(VirtIODevice *vdev, int n); 
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,

                    unsigned int len);

void virtqueue_flush(VirtQueue *vq, unsigned int count);

void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,

                       unsigned int len);

void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,

                    unsigned int len, unsigned int idx);