[PATCH 1/5] ucc_geth: Reduce IRQ off in xmit path
From: Joakim Tjernlund <hidden>
Date: 2012-09-18 16:56:36
Subsystem:
freescale quicc engine ucc ethernet driver, networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Currently ucc_geth_start_xmit wraps IRQ off for the whole body just to be safe. Reduce the IRQ off period to a minimum. Signed-off-by: Joakim Tjernlund <redacted> --- drivers/net/ethernet/freescale/ucc_geth.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
index 9ac14f8..e609c93 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c@@ -3181,8 +3181,6 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev) ugeth_vdbg("%s: IN", __func__); - spin_lock_irqsave(&ugeth->lock, flags); - dev->stats.tx_bytes += skb->len; /* Start from the next BD that should be filled */
@@ -3196,6 +3194,7 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev) (ugeth->skb_curtx[txQ] + 1) & TX_RING_MOD_MASK(ugeth->ug_info->bdRingLenTx[txQ]); + spin_lock_irqsave(&ugeth->lock, flags); /* set up the buffer descriptor */ out_be32(&((struct qe_bd __iomem *)bd)->buf, dma_map_single(ugeth->dev, skb->data,
@@ -3207,6 +3206,8 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev) /* set bd status and length */ out_be32((u32 __iomem *)bd, bd_status); + spin_unlock_irqrestore(&ugeth->lock, flags); + /* Move to next BD in the ring */ if (!(bd_status & T_W))
@@ -3238,8 +3239,6 @@ static int ucc_geth_start_xmit(struct sk_buff *skb, struct net_device *dev) uccf = ugeth->uccf; out_be16(uccf->p_utodr, UCC_FAST_TOD); #endif - spin_unlock_irqrestore(&ugeth->lock, flags); - return NETDEV_TX_OK; }
--
1.7.8.6