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vhost: Add count argument to vhost_svq_poll()

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Next patches in this series will no longer perform an
immediate poll and check of the device's used buffers
for each CVQ state load command. Instead, they will
send CVQ state load commands in parallel by polling
multiple pending buffers at once.

To achieve this, this patch refactoring vhost_svq_poll()
to accept a new argument `num`, which allows vhost_svq_poll()
to wait for the device to use multiple elements,
rather than polling for a single element.

Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <950b3bfcfc5d446168b9d6a249d554a013a691d4.1693287885.git.yin31149@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Hawkins Jiawei 2023-08-29 13:54:43 +08:00 • committed by Michael S. Tsirkin
parent f13f5f6412
commit b0de17a2e2
3 changed files with 24 additions and 16 deletions
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2
net/vhost-vdpa.c
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@ -645,7 +645,7 @@ static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len,
* descriptor. Also, we need to take the answer before SVQ pulls by itself,
* when BQL is released
*/
return vhost_svq_poll(svq);
return vhost_svq_poll(svq, 1);
}
static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class,