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Commit 312e0676 authored by Manish Chopra's avatar Manish Chopra Committed by David S. Miller
Browse files

qede: Utilize xmit_more 



This patch uses xmit_more optimization to reduce
number of TX doorbells write per packet.

Signed-off-by: default avatarManish <manish.chopra@qlogic.com>
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c774169d

drivers/net/ethernet/qlogic/qede/qede_main.c

+23 −14
Original line number Diff line number Diff line
@@ -485,6 +485,24 @@ static bool qede_pkt_req_lin(struct qede_dev *edev, struct sk_buff *skb, 
}

#endif



static inline void qede_update_tx_producer(struct qede_tx_queue *txq)

{

	/* wmb makes sure that the BDs data is updated before updating the

	 * producer, otherwise FW may read old data from the BDs.

	 */

	wmb();

	barrier();

	writel(txq->tx_db.raw, txq->doorbell_addr);



	/* mmiowb is needed to synchronize doorbell writes from more than one

	 * processor. It guarantees that the write arrives to the device before

	 * the queue lock is released and another start_xmit is called (possibly

	 * on another CPU). Without this barrier, the next doorbell can bypass

	 * this doorbell. This is applicable to IA64/Altix systems.

	 */

	mmiowb();

}



/* Main transmit function */

static

netdev_tx_t qede_start_xmit(struct sk_buff *skb,
@@ -543,6 +561,7 @@ netdev_tx_t qede_start_xmit(struct sk_buff *skb, 
	if (unlikely(dma_mapping_error(&edev->pdev->dev, mapping))) {

		DP_NOTICE(edev, "SKB mapping failed\n");

		qede_free_failed_tx_pkt(edev, txq, first_bd, 0, false);

		qede_update_tx_producer(txq);

		return NETDEV_TX_OK;

	}

	nbd++;
@@ -657,6 +676,7 @@ netdev_tx_t qede_start_xmit(struct sk_buff *skb, 
		if (rc) {

			qede_free_failed_tx_pkt(edev, txq, first_bd, nbd,

						data_split);

			qede_update_tx_producer(txq);

			return NETDEV_TX_OK;

		}
@@ -681,6 +701,7 @@ netdev_tx_t qede_start_xmit(struct sk_buff *skb, 
		if (rc) {

			qede_free_failed_tx_pkt(edev, txq, first_bd, nbd,

						data_split);

			qede_update_tx_producer(txq);

			return NETDEV_TX_OK;

		}

	}
@@ -701,20 +722,8 @@ netdev_tx_t qede_start_xmit(struct sk_buff *skb, 
	txq->tx_db.data.bd_prod =

		cpu_to_le16(qed_chain_get_prod_idx(&txq->tx_pbl));



	/* wmb makes sure that the BDs data is updated before updating the

	 * producer, otherwise FW may read old data from the BDs.

	 */

	wmb();

	barrier();

	writel(txq->tx_db.raw, txq->doorbell_addr);



	/* mmiowb is needed to synchronize doorbell writes from more than one

	 * processor. It guarantees that the write arrives to the device before

	 * the queue lock is released and another start_xmit is called (possibly

	 * on another CPU). Without this barrier, the next doorbell can bypass

	 * this doorbell. This is applicable to IA64/Altix systems.

	 */

	mmiowb();

	if (!skb->xmit_more || netif_tx_queue_stopped(netdev_txq))

		qede_update_tx_producer(txq);



	if (unlikely(qed_chain_get_elem_left(&txq->tx_pbl)

		      < (MAX_SKB_FRAGS + 1))) {