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Commit 4b2a4a96 authored by Woojung.Huh@microchip.com's avatar Woojung.Huh@microchip.com Committed by David S. Miller
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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: default avatarWoojung Huh <woojung.huh@microchip.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a0db7d10

drivers/net/usb/lan78xx.c

+3 −1
Original line number Original line Diff line number Diff line
@@ -2263,7 +2263,9 @@ netdev_tx_t lan78xx_start_xmit(struct sk_buff *skb, struct net_device *net) 
	if (skb2) {

	if (skb2) {

		skb_queue_tail(&dev->txq_pend, 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);

			netif_stop_queue(net);

	} else {

	} else {

		netif_dbg(dev, tx_err, dev->net,

		netif_dbg(dev, tx_err, dev->net,