net: add napi_if_scheduled_mark_missed (6c5c9581) · Commits · 戴 / test

The function napi_if_scheduled_mark_missed is used to check if the NAPI context is scheduled, if so set NAPIF_STATE_MISSED and return true. Used by the AF_XDP zero-copy i40e Tx code implementation in order to make sure that irq affinity is honored by the napi context. Signed-off-by:

Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by:

Alexei Starovoitov <ast@kernel.org>

include/linux/netdevice.h

+26 −0

Original line number	Diff line number	Diff line
		@@ -535,6 +535,32 @@ static inline void napi_synchronize(const struct napi_struct *n)
		barrier();
		}

		/**
		* napi_if_scheduled_mark_missed - if napi is running, set the
		* NAPIF_STATE_MISSED
		* @n: NAPI context
		*
		* If napi is running, set the NAPIF_STATE_MISSED, and return true if
		* NAPI is scheduled.
		**/
		static inline bool napi_if_scheduled_mark_missed(struct napi_struct *n)
		{
		unsigned long val, new;

		do {
		val = READ_ONCE(n->state);
		if (val & NAPIF_STATE_DISABLE)
		return true;

		if (!(val & NAPIF_STATE_SCHED))
		return false;

		new = val \| NAPIF_STATE_MISSED;
		} while (cmpxchg(&n->state, val, new) != val);

		return true;
		}

		enum netdev_queue_state_t {
		__QUEUE_STATE_DRV_XOFF,
		__QUEUE_STATE_STACK_XOFF,

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