8139cp: enable bql

This adds support for byte queue limits on RTL8139C+

Tested on real hardware.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-By: Dave Täht <dave.taht@bufferbloat.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/8139cp.c

@@ -648,6 +648,7 @@ static void cp_tx (struct cp_private *cp)
 {
  unsigned tx_head = cp->tx_head;
  unsigned tx_tail = cp->tx_tail;
+ unsigned bytes_compl = 0, pkts_compl = 0;
 
  while (tx_tail != tx_head) {
  struct cp_desc *txd = cp->tx_ring + tx_tail;
@@ -666,6 +667,9 @@ static void cp_tx (struct cp_private *cp)
  le32_to_cpu(txd->opts1) & 0xffff,
  PCI_DMA_TODEVICE);
 
+ bytes_compl += skb->len;
+ pkts_compl++;
+
  if (status & LastFrag) {
  if (status & (TxError | TxFIFOUnder)) {
  netif_dbg(cp, tx_err, cp->dev,
@@ -697,6 +701,7 @@ static void cp_tx (struct cp_private *cp)
 
  cp->tx_tail = tx_tail;
 
+ netdev_completed_queue(cp->dev, pkts_compl, bytes_compl);
  if (TX_BUFFS_AVAIL(cp) > (MAX_SKB_FRAGS + 1))
  netif_wake_queue(cp->dev);
 }
@@ -843,6 +848,8 @@ static netdev_tx_t cp_start_xmit (struct sk_buff *skb,
  wmb();
  }
  cp->tx_head = entry;
+
+ netdev_sent_queue(dev, skb->len);
  netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
  entry, skb->len);
  if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1))
@@ -937,6 +944,8 @@ static void cp_stop_hw (struct cp_private *cp)
 
  cp->rx_tail = 0;
  cp->tx_head = cp->tx_tail = 0;
+
+ netdev_reset_queue(cp->dev);
 }
 
 static void cp_reset_hw (struct cp_private *cp)
@@ -987,6 +996,8 @@ static inline void cp_start_hw (struct cp_private *cp)
  * This variant appears to work fine.
  */
  cpw8(Cmd, RxOn | TxOn);
+
+ netdev_reset_queue(cp->dev);
 }
 
 static void cp_enable_irq(struct cp_private *cp)