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| author | Steve Glendinning <steve.glendinning@smsc.com> | 2008-12-16 02:00:48 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-16 02:00:48 -0800 |
| commit | bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca (patch) | |
| tree | 675887b8007a53464e84b9da2f7b54a77fab035a /include/linux/mii.h | |
| parent | e18ce3465477502108187c6c08b6423fb784a313 (diff) | |
| download | linux-bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca.tar.gz linux-bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca.tar.bz2 linux-bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca.zip | |
net: Refactor full duplex flow control resolution
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>
Diffstat (limited to 'include/linux/mii.h')
| -rw-r--r-- | include/linux/mii.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/mii.h b/include/linux/mii.h index 4a376e0816fd..ad748588faf1 100644 --- a/include/linux/mii.h +++ b/include/linux/mii.h @@ -239,5 +239,34 @@ static inline unsigned int mii_duplex (unsigned int duplex_lock, return 0; } +/** + * mii_resolve_flowctrl_fdx + * @lcladv: value of MII ADVERTISE register + * @rmtadv: value of MII LPA register + * + * Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3 + */ +static inline u8 mii_resolve_flowctrl_fdx(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; +} + #endif /* __KERNEL__ */ #endif /* __LINUX_MII_H__ */ |