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

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

drivers/net/hyperv/netvsc.c

+8 −3
Original line number Diff line number Diff line
@@ -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 &&