diff options
| author | stephen hemminger <stephen@networkplumber.org> | 2017-07-28 17:59:47 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-30 00:25:43 +0200 |
| commit | f4e403633bcd290a4db2568364657d07b42ff890 (patch) | |
| tree | bcd7f9aa7c5ec08698a1aafa93b64fe161492e39 | |
| parent | netvsc: fix error unwind on device setup failure (diff) | |
| download | linux-f4e403633bcd290a4db2568364657d07b42ff890.tar.xz linux-f4e403633bcd290a4db2568364657d07b42ff890.zip | |
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@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/hyperv/netvsc.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index db95487807fd..c64934c64dca 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1195,10 +1195,15 @@ 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(nvchan) == 0 && work_done < budget && |