netdev - Re: Bogus frames transmitted with r8169 & fragmentation & large mtu

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Date:	Thu, 16 Feb 2012 08:46:37 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	hayeswang <hayeswang@...ltek.com>
Cc:	"'Eric Dumazet'" <eric.dumazet@...il.com>,
	"'Nick Bowler'" <nbowler@...iptictech.com>, netdev@...r.kernel.org
Subject: Re: Bogus frames transmitted with r8169 & fragmentation & large mtu

hayeswang <hayeswang@...ltek.com> :
[...]
> Please add Cfg9346_Unlock before calling rtl_hw_jumbo_enable or
> hw_jumbo_disable.
> And, add Cfg9346_lock after calling rlt_hw_jumbo_enable or hw_jumbo_disable. 

Thanks.

I am testing it now.

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 5eb6858..81e6ea2 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -3833,12 +3833,20 @@ static void rtl8169_init_ring_indexes(struct rtl8169_private *tp)
 
 static void rtl_hw_jumbo_enable(struct rtl8169_private *tp)
 {
+	void __iomem *ioaddr = tp->mmio_addr;
+
+	RTL_W8(Cfg9346, Cfg9346_Unlock);
 	rtl_generic_op(tp, tp->jumbo_ops.enable);
+	RTL_W8(Cfg9346, Cfg9346_Lock);
 }
 
 static void rtl_hw_jumbo_disable(struct rtl8169_private *tp)
 {
+	void __iomem *ioaddr = tp->mmio_addr;
+
+	RTL_W8(Cfg9346, Cfg9346_Unlock);
 	rtl_generic_op(tp, tp->jumbo_ops.disable);
+	RTL_W8(Cfg9346, Cfg9346_Lock);
 }
 
 static void r8168c_hw_jumbo_enable(struct rtl8169_private *tp)
--
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