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| author | Gabor Juhos <juhosg@openwrt.org> | 2011-05-08 16:32:53 +0000 |
|---|---|---|
| committer | Gabor Juhos <juhosg@openwrt.org> | 2011-05-08 16:32:53 +0000 |
| commit | 5d77f370d695c9a70f25ffb8367db64efadaaedd (patch) | |
| tree | 447565cb138433c4789c5f2010512d9a0db57361 | |
| parent | 37116582811963a277f3219059371998645e0b13 (diff) | |
| download | upstream-5d77f370d695c9a70f25ffb8367db64efadaaedd.tar.gz upstream-5d77f370d695c9a70f25ffb8367db64efadaaedd.tar.bz2 upstream-5d77f370d695c9a70f25ffb8367db64efadaaedd.zip | |
ar71xx: ag71xx: make switch register access atomic
Reading of the PHY registers occasionally returns with bogus values
under heavy load. This misleads the PHY driver and thus causes false
link/speed change notifications which leads to performance loss.
This is easily noticable during an iperf session:
...
[ 3] 52.0-53.0 sec 11.3 MBytes 94.4 Mbits/sec
[ 3] 53.0-54.0 sec 11.4 MBytes 95.4 Mbits/sec
eth1: link down
br-lan: port 2(eth1) entering forwarding state
eth1: link up (100Mbps/Full duplex)
br-lan: port 2(eth1) entering forwarding state
br-lan: port 2(eth1) entering forwarding state
[ 3] 54.0-55.0 sec 6.75 MBytes 56.6 Mbits/sec
[ 3] 55.0-56.0 sec 0.00 Bytes 0.00 bits/sec
[ 3] 56.0-57.0 sec 10.5 MBytes 88.1 Mbits/sec
...
[ 3] 169.0-170.0 sec 11.4 MBytes 95.4 Mbits/sec
[ 3] 170.0-171.0 sec 11.4 MBytes 95.4 Mbits/sec
eth1: link up (10Mbps/Half duplex)
[ 3] 171.0-172.0 sec 7.63 MBytes 64.0 Mbits/sec
[ 3] 172.0-173.0 sec 9.38 MBytes 78.6 Mbits/sec
eth1: link up (100Mbps/Full duplex)
[ 3] 173.0-174.0 sec 11.3 MBytes 94.4 Mbits/sec
[ 3] 174.0-175.0 sec 11.4 MBytes 95.4 Mbits/sec
SVN-Revision: 26856
| -rw-r--r-- | target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c index 0270e60511..1bc7f58c17 100644 --- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c +++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_ar7240.c @@ -233,37 +233,39 @@ static inline u16 mk_high_addr(u32 reg) static u32 __ar7240sw_reg_read(struct mii_bus *mii, u32 reg) { + unsigned long flags; u16 phy_addr; u16 phy_reg; u32 hi, lo; reg = (reg & 0xfffffffc) >> 2; - - ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg)); - phy_addr = mk_phy_addr(reg); phy_reg = mk_phy_reg(reg); + local_irq_save(flags); + ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg)); lo = (u32) ag71xx_mdio_mii_read(mii->priv, phy_addr, phy_reg); hi = (u32) ag71xx_mdio_mii_read(mii->priv, phy_addr, phy_reg + 1); + local_irq_restore(flags); return (hi << 16) | lo; } static void __ar7240sw_reg_write(struct mii_bus *mii, u32 reg, u32 val) { + unsigned long flags; u16 phy_addr; u16 phy_reg; reg = (reg & 0xfffffffc) >> 2; - - ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg)); - phy_addr = mk_phy_addr(reg); phy_reg = mk_phy_reg(reg); + local_irq_save(flags); + ag71xx_mdio_mii_write(mii->priv, 0x1f, 0x10, mk_high_addr(reg)); ag71xx_mdio_mii_write(mii->priv, phy_addr, phy_reg + 1, (val >> 16)); ag71xx_mdio_mii_write(mii->priv, phy_addr, phy_reg, (val & 0xffff)); + local_irq_restore(flags); } static u32 ar7240sw_reg_read(struct mii_bus *mii, u32 reg_addr) |