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Commit 47b344b2 authored by Ron Angeles's avatar Ron Angeles Committed by David S. Miller
Browse files

net: atl1c: add BQL support 



This BQL implementation is mostly derived from its related driver, alx.
Tested on AR8131 (rev c0) [1969:1063]. Saturated a 100mbps link with 5
concurrent runs of netperf. Ping latency dropped from 14ms to 3ms.

Signed-off-by: default avatarRon Angeles <ronangeles@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b5960e6e

drivers/net/ethernet/atheros/atl1c/atl1c_main.c

+10 −0
Original line number Diff line number Diff line
@@ -874,6 +874,8 @@ static void atl1c_clean_tx_ring(struct atl1c_adapter *adapter, 
		atl1c_clean_buffer(pdev, buffer_info);

	}



	netdev_reset_queue(adapter->netdev);



	/* Zero out Tx-buffers */

	memset(tpd_ring->desc, 0, sizeof(struct atl1c_tpd_desc) *

		ring_count);
@@ -1551,6 +1553,7 @@ static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter, 
	u16 next_to_clean = atomic_read(&tpd_ring->next_to_clean);

	u16 hw_next_to_clean;

	u16 reg;

	unsigned int total_bytes = 0, total_packets = 0;



	reg = type == atl1c_trans_high ? REG_TPD_PRI1_CIDX : REG_TPD_PRI0_CIDX;
@@ -1558,12 +1561,18 @@ static bool atl1c_clean_tx_irq(struct atl1c_adapter *adapter, 


	while (next_to_clean != hw_next_to_clean) {

		buffer_info = &tpd_ring->buffer_info[next_to_clean];

		if (buffer_info->skb) {

			total_bytes += buffer_info->skb->len;

			total_packets++;

		}

		atl1c_clean_buffer(pdev, buffer_info);

		if (++next_to_clean == tpd_ring->count)

			next_to_clean = 0;

		atomic_set(&tpd_ring->next_to_clean, next_to_clean);

	}



	netdev_completed_queue(adapter->netdev, total_packets, total_bytes);



	if (netif_queue_stopped(adapter->netdev) &&

			netif_carrier_ok(adapter->netdev)) {

		netif_wake_queue(adapter->netdev);
@@ -2256,6 +2265,7 @@ static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb, 
		spin_unlock_irqrestore(&adapter->tx_lock, flags);

		dev_kfree_skb_any(skb);

	} else {

		netdev_sent_queue(adapter->netdev, skb->len);

		atl1c_tx_queue(adapter, skb, tpd, type);

		spin_unlock_irqrestore(&adapter->tx_lock, flags);

	}