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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.16 50/81] net: ethernet: ti: cpsw: fix tx vlan priority mapping
Date:   Fri, 27 Apr 2018 15:58:52 +0200
Message-Id: <20180427135746.128377272@linuxfoundation.org>
In-Reply-To: <20180427135743.216853156@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>


[ Upstream commit 5e391dc5a8d801a2410d0032ad4a428d1d61800c ]

The CPDMA_TX_PRIORITY_MAP in real is vlan pcp field priority mapping
register and basically replaces vlan pcp field for tagged packets.
So, set it to be 1:1 mapping. Otherwise, it will cause unexpected
change of egress vlan tagged packets, like prio 2 -> prio 5.

Fixes: e05107e6b747 ("net: ethernet: ti: cpsw: add multi queue support")
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/ti/cpsw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -125,7 +125,7 @@ do {								\
 
 #define RX_PRIORITY_MAPPING	0x76543210
 #define TX_PRIORITY_MAPPING	0x33221100
-#define CPDMA_TX_PRIORITY_MAP	0x01234567
+#define CPDMA_TX_PRIORITY_MAP	0x76543210
 
 #define CPSW_VLAN_AWARE		BIT(1)
 #define CPSW_ALE_VLAN_AWARE	1