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net: introduce napi_schedule_irqoff()

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napi_schedule() can be called from any context and has to mask hard
irqs.

Add a variant that can only be called from hard interrupts handlers
or when irqs are already masked.

Many NIC drivers can use it from their hard IRQ handler instead of
generic variant.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-10-28 18:05:13 -07:00 • committed by David S. Miller
commit bc9ad166e3
2 changed files with 27 additions and 1 deletions
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15
net/core/dev.c
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@ -4372,7 +4372,8 @@ static int process_backlog(struct napi_struct *napi, int quota)
* __napi_schedule - schedule for receive
* @n: entry to schedule
*
* The entry's receive function will be scheduled to run
* The entry's receive function will be scheduled to run.
* Consider using __napi_schedule_irqoff() if hard irqs are masked.
*/
void __napi_schedule(struct napi_struct *n)
{
@ -4384,6 +4385,18 @@ void __napi_schedule(struct napi_struct *n)
}
EXPORT_SYMBOL(__napi_schedule);
/**
* __napi_schedule_irqoff - schedule for receive
* @n: entry to schedule
*
* Variant of __napi_schedule() assuming hard irqs are masked
*/
void __napi_schedule_irqoff(struct napi_struct *n)
{
____napi_schedule(this_cpu_ptr(&softnet_data), n);
}
EXPORT_SYMBOL(__napi_schedule_irqoff);
void __napi_complete(struct napi_struct *n)
{
BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));