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ramips: Add byte queue limits support to net/ethernet/ramips_main.c

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Add byte queue limits support to net/ethernet/ramips_main.c

"Byte queue limits are a mechanism to limit the size of the transmit
hardware queue on a NIC by number of bytes. The goal of these byte
limits is too reduce latency (HOL blocking) caused by excessive
queuing in hardware (aka buffer bloat) without sacrificing
throughput."

Signed-off-by: Tobias Diedrich <ranma+openwrt@tdiedrich.de>

SVN-Revision: 31844
This commit is contained in:
Gabor Juhos 2012-05-23 21:05:23 +00:00
parent 1d286fd755
commit e4720dfa95
1 changed files with 8 additions and 0 deletions
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8
target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c
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@ -177,6 +177,8 @@ ramips_ring_cleanup(struct raeth_priv *re)
txi->tx_skb = NULL; txi->tx_skb = NULL;
} }
} }
netdev_reset_queue(re->netdev);
} }
#if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883) #if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883)
@ -699,6 +701,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev->stats.tx_packets++; dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len; dev->stats.tx_bytes += skb->len;
ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0); ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
netdev_sent_queue(dev, skb->len);
spin_unlock(&re->page_lock); spin_unlock(&re->page_lock);
return NETDEV_TX_OK; return NETDEV_TX_OK;
@ -780,6 +783,7 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
{ {
struct net_device *dev = (struct net_device*)ptr; struct net_device *dev = (struct net_device*)ptr;
struct raeth_priv *re = netdev_priv(dev); struct raeth_priv *re = netdev_priv(dev);
unsigned int bytes_compl = 0, pkts_compl = 0;
spin_lock(&re->page_lock); spin_lock(&re->page_lock);
while (1) { while (1) {
@ -792,12 +796,16 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb)) if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb))
break; break;
pkts_compl++;
bytes_compl += txi->tx_skb->len;
dev_kfree_skb_irq(txi->tx_skb); dev_kfree_skb_irq(txi->tx_skb);
txi->tx_skb = NULL; txi->tx_skb = NULL;
re->skb_free_idx++; re->skb_free_idx++;
if (re->skb_free_idx >= NUM_TX_DESC) if (re->skb_free_idx >= NUM_TX_DESC)
re->skb_free_idx = 0; re->skb_free_idx = 0;
} }
netdev_completed_queue(dev, pkts_compl, bytes_compl);
spin_unlock(&re->page_lock); spin_unlock(&re->page_lock);
ramips_fe_int_enable(RAMIPS_TX_DLY_INT); ramips_fe_int_enable(RAMIPS_TX_DLY_INT);