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net: stmmac: add BQL support

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Add support for Byte Queue Limits to the STMicro MAC driver.

Tested on a Amlogic S802 quad Cortex-A9 board, where the use of BQL
decreases the latency of a high priority ping from ~12ms to ~1ms when
the 100Mbit link is saturated by 20 TCP streams.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Beniamino Galvani 2015-01-21 19:07:27 +01:00 committed by David S. Miller
parent 1793c798c3
commit 3897957494
1 changed files with 9 additions and 0 deletions
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9
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -1097,6 +1097,7 @@ static int init_dma_desc_rings(struct net_device *dev, gfp_t flags)
priv->dirty_tx = 0;
priv->cur_tx = 0;
netdev_reset_queue(priv->dev);
stmmac_clear_descriptors(priv);
@ -1300,6 +1301,7 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
static void stmmac_tx_clean(struct stmmac_priv *priv)
{
unsigned int txsize = priv->dma_tx_size;
unsigned int bytes_compl = 0, pkts_compl = 0;
spin_lock(&priv->tx_lock);
@ -1356,6 +1358,8 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
priv->hw->mode->clean_desc3(priv, p);
if (likely(skb != NULL)) {
pkts_compl++;
bytes_compl += skb->len;
dev_consume_skb_any(skb);
priv->tx_skbuff[entry] = NULL;
}
@ -1364,6 +1368,9 @@ static void stmmac_tx_clean(struct stmmac_priv *priv)
priv->dirty_tx++;
}
netdev_completed_queue(priv->dev, pkts_compl, bytes_compl);
if (unlikely(netif_queue_stopped(priv->dev) &&
stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
netif_tx_lock(priv->dev);
@ -1418,6 +1425,7 @@ static void stmmac_tx_err(struct stmmac_priv *priv)
(i == txsize - 1));
priv->dirty_tx = 0;
priv->cur_tx = 0;
netdev_reset_queue(priv->dev);
priv->hw->dma->start_tx(priv->ioaddr);
priv->dev->stats.tx_errors++;
@ -2050,6 +2058,7 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
if (!priv->hwts_tx_en)
skb_tx_timestamp(skb);
netdev_sent_queue(dev, skb->len);
priv->hw->dma->enable_dma_transmission(priv->ioaddr);
spin_unlock(&priv->tx_lock);