Commit 48374ddc authored by Yevgeny Petrilin's avatar Yevgeny Petrilin Committed by David S. Miller
Browse files

mlx4_en: Removed TX locking when polling TX cq 



There is no need to synchronize the polling with the transmit
function. The only place to synchronize is when we process
the cq from the transmit function. Also removed spin_lock_irq,
and using spin_trylock, if somebody else is already processing the cq,
no need to wait for it to finish.

Signed-off-by: default avatarYevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b51968d6

drivers/net/mlx4/en_tx.c

+13 −11
Original line number Diff line number Diff line
@@ -404,14 +404,12 @@ void mlx4_en_tx_irq(struct mlx4_cq *mcq) 
	struct mlx4_en_priv *priv = netdev_priv(cq->dev);

	struct mlx4_en_tx_ring *ring = &priv->tx_ring[cq->ring];



	spin_lock_irq(&ring->comp_lock);

	cq->armed = 0;

	if (!spin_trylock(&ring->comp_lock))

		return;

	mlx4_en_process_tx_cq(cq->dev, cq);

	if (ring->blocked)

		mlx4_en_arm_cq(priv, cq);

	else

	mod_timer(&cq->timer, jiffies + 1);

	spin_unlock_irq(&ring->comp_lock);

	spin_unlock(&ring->comp_lock);

}
@@ -424,8 +422,10 @@ void mlx4_en_poll_tx_cq(unsigned long data) 


	INC_PERF_COUNTER(priv->pstats.tx_poll);



	netif_tx_lock(priv->dev);

	spin_lock_irq(&ring->comp_lock);

	if (!spin_trylock(&ring->comp_lock)) {

		mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT);

		return;

	}

	mlx4_en_process_tx_cq(cq->dev, cq);

	inflight = (u32) (ring->prod - ring->cons - ring->last_nr_txbb);
@@ -435,8 +435,7 @@ void mlx4_en_poll_tx_cq(unsigned long data) 
	if (inflight && priv->port_up)

		mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT);



	spin_unlock_irq(&ring->comp_lock);

	netif_tx_unlock(priv->dev);

	spin_unlock(&ring->comp_lock);

}



static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
@@ -479,7 +478,10 @@ static inline void mlx4_en_xmit_poll(struct mlx4_en_priv *priv, int tx_ind) 


	/* Poll the CQ every mlx4_en_TX_MODER_POLL packets */

	if ((++ring->poll_cnt & (MLX4_EN_TX_POLL_MODER - 1)) == 0)

		if (spin_trylock(&ring->comp_lock)) {

			mlx4_en_process_tx_cq(priv->dev, cq);

			spin_unlock(&ring->comp_lock);

		}

}



static void *get_frag_ptr(struct sk_buff *skb)

CRA Git | Maintained and supported by SUSTech CRA and CCSE