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-rw-r--r--include/linux/mii.h33
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/mii.h b/include/linux/mii.h
index 151b7e0182c7..ad748588faf1 100644
--- a/include/linux/mii.h
+++ b/include/linux/mii.h
@@ -135,6 +135,10 @@
#define LPA_1000FULL 0x0800 /* Link partner 1000BASE-T full duplex */
#define LPA_1000HALF 0x0400 /* Link partner 1000BASE-T half duplex */
+/* Flow control flags */
+#define FLOW_CTRL_TX 0x01
+#define FLOW_CTRL_RX 0x02
+
/* This structure is used in all SIOCxMIIxxx ioctl calls */
struct mii_ioctl_data {
__u16 phy_id;
@@ -235,5 +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__ */