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vhost-net: reduce vq polling on tx zerocopy 

It seems that to avoid deadlocks it is enough to poll vq before
 we are going to use the last buffer.  This is faster than
c70aa540c7.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Michael S. Tsirkin 2012-11-01 09:16:55 +00:00 committed by David S. Miller
parent eaae8132ef
commit 24eb21a148
1 changed files with 11 additions and 1 deletions
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12
drivers/vhost/net.c
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@ -197,8 +197,18 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
{
struct vhost_ubuf_ref *ubufs = ubuf->ctx;
struct vhost_virtqueue *vq = ubufs->vq;
int cnt = atomic_read(&ubufs->kref.refcount);
vhost_poll_queue(&vq->poll);
/*
* Trigger polling thread if guest stopped submitting new buffers:
* in this case, the refcount after decrement will eventually reach 1
* so here it is 2.
* We also trigger polling periodically after each 16 packets
* (the value 16 here is more or less arbitrary, it's tuned to trigger
* less than 10% of times).
*/
if (cnt <= 2 || !(cnt % 16))
vhost_poll_queue(&vq->poll);
/* set len to mark this desc buffers done DMA */
vq->heads[ubuf->desc].len = success ?
VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN;