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lan78xx: throttle TX path at slower than SuperSpeed USB 

Throttle TX path only at slower than SuperSpeed USB.
SuperSpeed USB has enough bandwidth to maintain GigE.

Signed-off-by: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Woojung.Huh@microchip.com 2016-01-27 22:57:54 +00:00 committed by David S. Miller
parent a0db7d10b7
commit 4b2a4a9653
1 changed files with 3 additions and 1 deletions
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4
drivers/net/usb/lan78xx.c
View File

@ -2263,7 +2263,9 @@ netdev_tx_t lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net)
if (skb2) {
skb_queue_tail(&dev->txq_pend, skb2);
if (skb_queue_len(&dev->txq_pend) > 10)
/* throttle TX patch at slower than SUPER SPEED USB */
if ((dev->udev->speed < USB_SPEED_SUPER) &&
(skb_queue_len(&dev->txq_pend) > 10))
netif_stop_queue(net);
} else {
netif_dbg(dev, tx_err, dev->net,