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mlx4_en: Removed TX locking when polling TX cq

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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: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yevgeny Petrilin 2008-12-25 18:13:45 -08:00 committed by David S. Miller
parent b51968d676
commit 48374ddce7
1 changed files with 13 additions and 11 deletions
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24
drivers/net/mlx4/en_tx.c
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@ -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);
mod_timer(&cq->timer, jiffies + 1);
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)
mlx4_en_process_tx_cq(priv->dev, cq);
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)