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ramips: Add byte queue limits support to net/ethernet/ramips_main.c
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> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31844 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -177,6 +177,8 @@ ramips_ring_cleanup(struct raeth_priv *re)
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txi->tx_skb = NULL;
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}
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}
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netdev_reset_queue(re->netdev);
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}
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#if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883)
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@ -699,6 +701,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
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netdev_sent_queue(dev, skb->len);
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spin_unlock(&re->page_lock);
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return NETDEV_TX_OK;
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@ -780,6 +783,7 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
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{
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struct net_device *dev = (struct net_device*)ptr;
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struct raeth_priv *re = netdev_priv(dev);
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unsigned int bytes_compl = 0, pkts_compl = 0;
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spin_lock(&re->page_lock);
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while (1) {
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@ -792,12 +796,16 @@ ramips_eth_tx_housekeeping(unsigned long ptr)
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if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb))
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break;
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pkts_compl++;
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bytes_compl += txi->tx_skb->len;
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dev_kfree_skb_irq(txi->tx_skb);
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txi->tx_skb = NULL;
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re->skb_free_idx++;
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if (re->skb_free_idx >= NUM_TX_DESC)
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re->skb_free_idx = 0;
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}
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netdev_completed_queue(dev, pkts_compl, bytes_compl);
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spin_unlock(&re->page_lock);
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ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
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