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sfc: don't rearm interrupts if busy polling 

Since commit 364b605573 ("net: busy-poll: return busypolling status
to drivers"), napi_complete_done() returns a boolean that can be used
by drivers to conditionally rearm interrupts.

Testing with a 7142 shows a small latency improvement of ~100 ns.

Signed-off-by: Bert Kenward <bkenward@solarflare.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bert Kenward 2017-02-06 16:50:55 +00:00 committed by David S. Miller
parent d15c9ede61
commit f820c0ac6c
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/sfc/efx.c
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@ -328,8 +328,8 @@ static int efx_poll(struct napi_struct *napi, int budget)
* since efx_nic_eventq_read_ack() will have no effect if
* interrupts have already been disabled.
*/
napi_complete_done(napi, spent);
efx_nic_eventq_read_ack(channel);
if (napi_complete_done(napi, spent))
efx_nic_eventq_read_ack(channel);
}
return spent;