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)
nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
}
/* if ring is empty, signal host */
if (!nvchan->desc)
hv_pkt_iter_close(channel);
/* If send of pending receive completions suceeded
* and did not exhaust NAPI budget
* and did not exhaust NAPI budget this time
* 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 &&
work_done < budget &&
......
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