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forcedeth: power down phy when interface is down 

Bring the physical link down when the interface is down by placing the PHY
in power-down state, unless WOL is enabled.  This mirrors the behavior of
other drivers including e1000 and tg3.

Without the patch, ifconfig down leaves the physical link up, which confuses
datacenter users who expect the link lights both on the NIC and the switch to
go out when they bring an interface down.

Furthermore, even though the phy is powered on, autonegotiation stops working,
so a normally gigabit link might suddenly become 100 Mbit half-duplex when the
interface goes down, and become gigabit when it comes up again.

Ayaz said:

  I would not include this patch until further testing is performed.  NVIDIA
  MCP chips use 3rd party PHY vendors.  By powering down the phy, it could
  have adverse affects on certain phys.

Arthur Jones said:

  I just ran across this patch.  Tested on a Marvell 88E1121R (GigE PHY)
  and works great.  This is a very important feature for me.

Signed-off-by: Ed Swierk <eswierk@arastra.com>
Tested-by: Arthur Jones <ajones@riverbed.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ed Swierk 2008-12-01 12:24:43 +00:00 committed by David S. Miller
parent a316084c2f
commit cb52deba12
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/forcedeth.c
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@ -1446,9 +1446,9 @@ static int phy_init(struct net_device *dev)
/* some phys clear out pause advertisment on reset, set it back */ /* some phys clear out pause advertisment on reset, set it back */
mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg); mii_rw(dev, np->phyaddr, MII_ADVERTISE, reg);
/* restart auto negotiation */ /* restart auto negotiation, power down phy */
mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ); mii_control = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE); mii_control |= (BMCR_ANRESTART | BMCR_ANENABLE | BMCR_PDOWN);
if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control)) { if (mii_rw(dev, np->phyaddr, MII_BMCR, mii_control)) {
return PHY_ERROR; return PHY_ERROR;
} }
@ -5208,6 +5208,10 @@ static int nv_open(struct net_device *dev)
dprintk(KERN_DEBUG "nv_open: begin\n"); dprintk(KERN_DEBUG "nv_open: begin\n");
/* power up phy */
mii_rw(dev, np->phyaddr, MII_BMCR,
mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ) & ~BMCR_PDOWN);
/* erase previous misconfiguration */ /* erase previous misconfiguration */
if (np->driver_data & DEV_HAS_POWER_CNTRL) if (np->driver_data & DEV_HAS_POWER_CNTRL)
nv_mac_reset(dev); nv_mac_reset(dev);
@ -5401,6 +5405,10 @@ static int nv_close(struct net_device *dev)
if (np->wolenabled) { if (np->wolenabled) {
writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags); writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags);
nv_start_rx(dev); nv_start_rx(dev);
} else {
/* power down phy */
mii_rw(dev, np->phyaddr, MII_BMCR,
mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ)|BMCR_PDOWN);
} }
/* FIXME: power down nic */ /* FIXME: power down nic */