cxgb4: Freelist starving threshold varies from adapter to adapter (c098b026) · Commits · 戴 / test

drivers/net/ethernet/chelsio/cxgb4/sge.c

+16 −10

Original line number	Diff line number	Diff line
		@@ -120,12 +120,6 @@
		*/
		#define NOMEM_TMR_IDX (SGE_NTIMERS - 1)

		/*
		* An FL with <= FL_STARVE_THRES buffers is starving and a periodic timer will
		* attempt to refill it.
		*/
		#define FL_STARVE_THRES 4

		/*
		* Suspend an Ethernet Tx queue with fewer available descriptors than this.
		* This is the same as calc_tx_descs() for a TSO packet with
		@@ -248,9 +242,21 @@ static inline unsigned int fl_cap(const struct sge_fl *fl)
		return fl->size - 8; /* 1 descriptor = 8 buffers */
		}

		static inline bool fl_starving(const struct sge_fl *fl)
		/**
		* fl_starving - return whether a Free List is starving.
		* @adapter: pointer to the adapter
		* @fl: the Free List
		*
		* Tests specified Free List to see whether the number of buffers
		* available to the hardware has falled below our "starvation"
		* threshold.
		*/
		static inline bool fl_starving(const struct adapter *adapter,
		const struct sge_fl *fl)
		{
		return fl->avail - fl->pend_cred <= FL_STARVE_THRES;
		const struct sge *s = &adapter->sge;

		return fl->avail - fl->pend_cred <= s->fl_starve_thres;
		}

		static int map_skb(struct device dev, const struct sk_buff skb,
		@@ -655,7 +661,7 @@ out: cred = q->avail - cred;
		q->pend_cred += cred;
		ring_fl_db(adap, q);

		if (unlikely(fl_starving(q))) {
		if (unlikely(fl_starving(adap, q))) {
		smp_wmb();
		set_bit(q->cntxt_id - adap->sge.egr_start,
		adap->sge.starving_fl);
		@@ -2248,7 +2254,7 @@ static void sge_rx_timer_cb(unsigned long data)
		clear_bit(id, s->starving_fl);
		smp_mb__after_atomic();

		if (fl_starving(fl)) {
		if (fl_starving(adap, fl)) {
		rxq = container_of(fl, struct sge_eth_rxq, fl);
		if (napi_reschedule(&rxq->rspq.napi))
		fl->starving++;

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