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authorSteve Glendinning <steve.glendinning@smsc.com>2008-12-16 02:00:48 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-16 02:00:48 -0800
commitbc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca (patch)
tree675887b8007a53464e84b9da2f7b54a77fab035a /include/linux/mii.h
parente18ce3465477502108187c6c08b6423fb784a313 (diff)
downloadop-kernel-dev-bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca.zip
op-kernel-dev-bc02ff95fe4ebd3e5ee7455c0aa6f76ebe39ebca.tar.gz
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.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/mii.h b/include/linux/mii.h
index 4a376e0..ad74858 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__ */
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