Commit f4e40363 authored by stephen hemminger's avatar stephen hemminger Committed by David S. Miller

netvsc: signal host if receive ring is emptied

Latency improvement related to NAPI conversion.
If all packets are processed from receive ring then need
to signal host.
Signed-off-by: default avatarStephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 49393347
...@@ -1195,10 +1195,15 @@ int netvsc_poll(struct napi_struct *napi, int budget) ...@@ -1195,10 +1195,15 @@ int netvsc_poll(struct napi_struct *napi, int budget)
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
} }
/* If send of pending receive completions suceeded /* if ring is empty, signal host */
* and did not exhaust NAPI budget if (!nvchan->desc)
hv_pkt_iter_close(channel);
/* If send of pending receive completions suceeded
* and did not exhaust NAPI budget this time
* and not doing busy poll * and not doing busy poll
* then reschedule if more data has arrived from host * then re-enable host interrupts
* and reschedule if ring is not empty.
*/ */
if (send_recv_completions(nvchan) == 0 && if (send_recv_completions(nvchan) == 0 &&
work_done < budget && work_done < budget &&
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment