Commit 364b6055 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: busy-poll: return busypolling status to drivers

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: default avatarEric Dumazet <>
Cc: Willem de Bruijn <>
Cc: Adam Belay <>
Cc: Tariq Toukan <>
Cc: Yuval Mintz <>
Cc: Ariel Elior <>
Signed-off-by: default avatarDavid S. Miller <>
parent 21cb84c4
......@@ -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);
......@@ -4898,7 +4898,7 @@ void __napi_schedule_irqoff(struct napi_struct *n)
void __napi_complete(struct napi_struct *n)
bool __napi_complete(struct napi_struct *n)
BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
......@@ -4906,15 +4906,16 @@ void __napi_complete(struct napi_struct *n)
* napi_complete_done().
if (unlikely(test_bit(NAPI_STATE_IN_BUSY_POLL, &n->state)))
return false;
clear_bit(NAPI_STATE_SCHED, &n->state);
return true;
void napi_complete_done(struct napi_struct *n, int work_done)
bool napi_complete_done(struct napi_struct *n, int work_done)
unsigned long flags;
......@@ -4926,7 +4927,7 @@ void napi_complete_done(struct napi_struct *n, int work_done)
if (unlikely(n->state & (NAPIF_STATE_NPSVC |
return false;
if (n->gro_list) {
unsigned long timeout = 0;
......@@ -4948,6 +4949,7 @@ void napi_complete_done(struct napi_struct *n, int work_done)
return true;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment