r8169: add byte queue limit support.

Nothing fancy:
- sent bytes count is notified in the start_xmit path right before
  updating the owner bit in the hardware Tx descriptor (E. Dumazet)
- avoid useless tp->dev dereferencing in start_xmit (E. Dumazet)

Use of netdev_reset_queue is favored over proper accounting in
rtl8169_tx_clear_range since the latter would need more work for the
same result (nb: said accounting degenerates to nothing in xmit_frags).

Signed-off-by: Igor Maravic <igorm@etf.rs>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index a4d7674..515a7ed 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -5399,6 +5399,7 @@ static void rtl8169_tx_clear(struct rtl8169_private *tp)
 {
        rtl8169_tx_clear_range(tp, tp->dirty_tx, NUM_TX_DESC);
        tp->cur_tx = tp->dirty_tx = 0;
+       netdev_reset_queue(tp->dev);
 }
 
 static void rtl_reset_work(struct rtl8169_private *tp)
@@ -5553,6 +5554,8 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 
        txd->opts2 = cpu_to_le32(opts[1]);
 
+       netdev_sent_queue(dev, skb->len);
+
        wmb();
 
        /* Anti gcc 2.95.3 bugware (sic) */
@@ -5647,9 +5650,16 @@ static void rtl8169_pcierr_interrupt(struct net_device *dev)
        rtl_schedule_task(tp, RTL_FLAG_TASK_RESET_PENDING);
 }
 
+struct rtl_txc {
+       int packets;
+       int bytes;
+};
+
 static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
 {
+       struct rtl8169_stats *tx_stats = &tp->tx_stats;
        unsigned int dirty_tx, tx_left;
+       struct rtl_txc txc = { 0, 0 };
 
        dirty_tx = tp->dirty_tx;
        smp_rmb();
@@ -5668,17 +5678,24 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp)
                rtl8169_unmap_tx_skb(&tp->pci_dev->dev, tx_skb,
                                     tp->TxDescArray + entry);
                if (status & LastFrag) {
-                       u64_stats_update_begin(&tp->tx_stats.syncp);
-                       tp->tx_stats.packets++;
-                       tp->tx_stats.bytes += tx_skb->skb->len;
-                       u64_stats_update_end(&tp->tx_stats.syncp);
-                       dev_kfree_skb(tx_skb->skb);
+                       struct sk_buff *skb = tx_skb->skb;
+
+                       txc.packets++;
+                       txc.bytes += skb->len;
+                       dev_kfree_skb(skb);
                        tx_skb->skb = NULL;
                }
                dirty_tx++;
                tx_left--;
        }
 
+       u64_stats_update_begin(&tx_stats->syncp);
+       tx_stats->packets += txc.packets;
+       tx_stats->bytes += txc.bytes;
+       u64_stats_update_end(&tx_stats->syncp);
+
+       netdev_completed_queue(dev, txc.packets, txc.bytes);
+
        if (tp->dirty_tx != dirty_tx) {
                tp->dirty_tx = dirty_tx;
                /* Sync with rtl8169_start_xmit: