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: Ron Angeles <ronangeles@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 932bd18..2795d6d 100644 (file)
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -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);
        }