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+open...@tdiedrich.de>
Index: target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c
===================================================================
--- target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c
(revision 31626)
+++ target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c
(working copy)
@@ -177,6 +177,8 @@
txi->tx_skb = NULL;
}
}
+
+ netdev_reset_queue(re->netdev);
}
#if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883)
@@ -699,6 +701,7 @@
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
+ netdev_sent_queue(dev, skb->len);
spin_unlock(&re->page_lock);
return NETDEV_TX_OK;
@@ -780,6 +783,7 @@
{
struct net_device *dev = (struct net_device*)ptr;
struct raeth_priv *re = netdev_priv(dev);
+ unsigned int bytes_compl = 0, pkts_compl = 0;
spin_lock(&re->page_lock);
while (1) {
@@ -792,12 +796,16 @@
if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb))
break;
+ pkts_compl++;
+ bytes_compl += txi->tx_skb->len;
+
dev_kfree_skb_irq(txi->tx_skb);
txi->tx_skb = NULL;
re->skb_free_idx++;
if (re->skb_free_idx >= NUM_TX_DESC)
re->skb_free_idx = 0;
}
+ netdev_completed_queue(dev, pkts_compl, bytes_compl);
spin_unlock(&re->page_lock);
ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
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