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smsc95xx: Configure pause time to 0xffff when tx flow control enabled 

Configure pause time to 0xffff when tx flow control enabled

Set pause time to 0xffff in the pause frame to indicate the
partner to stop sending the packets. When RX buffer frees up,
the device sends pause frame with pause time zero for partner to
resume transmission.

Fixes: 2f7ca802bd ("Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver")
Signed-off-by: Nisar Sayed <Nisar.Sayed@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nisar Sayed 2017-09-11 17:43:11 +00:00 committed by David S. Miller
parent 230cfd2dbc
commit 9c0827317f
1 changed files with 5 additions and 6 deletions
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11
drivers/net/usb/smsc95xx.c
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@ -526,7 +526,7 @@ static void smsc95xx_set_multicast(struct net_device *netdev)
static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
u16 lcladv, u16 rmtadv)
{
u32 flow, afc_cfg = 0;
u32 flow = 0, afc_cfg;
int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
if (ret < 0)
@ -537,20 +537,19 @@ static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
if (cap & FLOW_CTRL_RX)
flow = 0xFFFF0002;
else
flow = 0;
if (cap & FLOW_CTRL_TX)
if (cap & FLOW_CTRL_TX) {
afc_cfg |= 0xF;
else
flow |= 0xFFFF0000;
} else {
afc_cfg &= ~0xF;
}
netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
cap & FLOW_CTRL_RX ? "enabled" : "disabled",
cap & FLOW_CTRL_TX ? "enabled" : "disabled");
} else {
netif_dbg(dev, link, dev->net, "half duplex\n");
flow = 0;
afc_cfg |= 0xF;
}