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net: Refactor full duplex flow control resolution

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These 4 drivers have identical full duplex flow control resolution
functions.  This patch changes them all to use one common function.

The function in question decides whether a device should enable TX and
RX flow control in a standard way (IEEE 802.3-2005 table 28B-3), so this
should also be useful for other drivers.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steve Glendinning
2008-12-16 02:00:48 -08:00
committed by David S. Miller
parent e18ce34654
commit bc02ff95fe
5 changed files with 33 additions and 92 deletions
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24
drivers/net/smsc9420.c
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@@ -1080,28 +1080,6 @@ static void smsc9420_set_multicast_list(struct net_device *dev)
smsc9420_pci_flush_write(pd);
}
static u8 smsc9420_resolve_flowctrl_fulldplx(u16 lcladv, u16 rmtadv)
{
u8 cap = 0;
if (lcladv & ADVERTISE_PAUSE_CAP) {
if (lcladv & ADVERTISE_PAUSE_ASYM) {
if (rmtadv & LPA_PAUSE_CAP)
cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
else if (rmtadv & LPA_PAUSE_ASYM)
cap = FLOW_CTRL_RX;
} else {
if (rmtadv & LPA_PAUSE_CAP)
cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
}
} else if (lcladv & ADVERTISE_PAUSE_ASYM) {
if ((rmtadv & LPA_PAUSE_CAP) && (rmtadv & LPA_PAUSE_ASYM))
cap = FLOW_CTRL_TX;
}
return cap;
}
static void smsc9420_phy_update_flowcontrol(struct smsc9420_pdata *pd)
{
struct phy_device *phy_dev = pd->phy_dev;
@@ -1110,7 +1088,7 @@ static void smsc9420_phy_update_flowcontrol(struct smsc9420_pdata *pd)
if (phy_dev->duplex == DUPLEX_FULL) {
u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
u16 rmtadv = phy_read(phy_dev, MII_LPA);
u8 cap = smsc9420_resolve_flowctrl_fulldplx(lcladv, rmtadv);
u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
if (cap & FLOW_CTRL_RX)
flow = 0xFFFF0002;