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Message-Id: <20170725200422.13795-5-sthemmin@microsoft.com> Date: Tue, 25 Jul 2017 13:04:21 -0700 From: Stephen Hemminger <stephen@...workplumber.org> To: kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com Cc: devel@...uxdriverproject.org, netdev@...r.kernel.org Subject: [PATCH net-next 4/5] 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: Stephen Hemminger <sthemmin@...rosoft.com> --- drivers/net/hyperv/netvsc.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 03c1fec762c7..f5d7cae6ba70 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1189,10 +1189,15 @@ int netvsc_poll(struct napi_struct *napi, int budget) nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc); } - /* If send of pending receive completions suceeded - * and did not exhaust NAPI budget + /* 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 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(net_device, channel, q_idx) == 0 && work_done < budget && -- 2.11.0
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