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: 2f7ca802bdae ("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>

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 340c13484e5cc7dd5001577b7522d5a4318bd5b6..309b88acd3d0b6ca1528dde7b27a23926f9be952 100644 (file)
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -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;
        }