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net: busy-poll: return busypolling status to drivers

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NAPI drivers use napi_complete_done() or napi_complete() when
they drained RX ring and right before re-enabling device interrupts.

In busy polling, we can avoid interrupts being delivered since
we are polling RX ring in a controlled loop.

Drivers can chose to use napi_complete_done() return value
to reduce interrupts overhead while busy polling is active.

This is optional, legacy drivers should work fine even
if not updated.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Adam Belay <abelay@google.com>
Cc: Tariq Toukan <tariqt@mellanox.com>
Cc: Yuval Mintz <Yuval.Mintz@cavium.com>
Cc: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-11-15 10:15:13 -08:00 • committed by David S. Miller
parent 21cb84c48c
commit 364b605573
2 changed files with 10 additions and 7 deletions
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7
include/linux/netdevice.h
View file

@ -463,16 +463,17 @@ static inline bool napi_reschedule(struct napi_struct *napi)
return false;
}
void __napi_complete(struct napi_struct *n);
void napi_complete_done(struct napi_struct *n, int work_done);
bool __napi_complete(struct napi_struct *n);
bool napi_complete_done(struct napi_struct *n, int work_done);
/**
* napi_complete - NAPI processing complete
* @n: NAPI context
*
* Mark NAPI processing as complete.
* Consider using napi_complete_done() instead.
* Return false if device should avoid rearming interrupts.
*/
static inline void napi_complete(struct napi_struct *n)
static inline bool napi_complete(struct napi_struct *n)
{
return napi_complete_done(n, 0);
}