From 1c1e370033f9aa0e2aed8ef64764a924e6248609 Mon Sep 17 00:00:00 2001 From: Yuiko Oshino Date: Fri, 11 Aug 2017 12:44:57 -0400 Subject: [PATCH] net: Add mii_resolve_flowctrl_fdx() Add an mii helper function to resolve flow control status per IEEE 802.3-2005 table 28B-3. This function was taken from the Linux source tree. Signed-off-by: Yuiko Oshino Acked-by: Joe Hershberger --- include/linux/mii.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/linux/mii.h b/include/linux/mii.h index 66b83d83de..19afb746cd 100644 --- a/include/linux/mii.h +++ b/include/linux/mii.h @@ -190,4 +190,27 @@ 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 & rmtadv & ADVERTISE_PAUSE_CAP) { + cap = FLOW_CTRL_TX | FLOW_CTRL_RX; + } else if (lcladv & rmtadv & ADVERTISE_PAUSE_ASYM) { + if (lcladv & ADVERTISE_PAUSE_CAP) + cap = FLOW_CTRL_RX; + else if (rmtadv & ADVERTISE_PAUSE_CAP) + cap = FLOW_CTRL_TX; + } + + return cap; +} + #endif /* __LINUX_MII_H__ */ -- 2.39.5