linux-kernel - [PATCH net] net: ag71xx: remove unnecessary MTU reservation

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Message-Id: <20210218034514.3421-1-dqfext@gmail.com>
Date:   Thu, 18 Feb 2021 11:45:14 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Oleksij Rempel <linux@...pel-privat.de>,
        Chris Snook <chris.snook@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Rosen Penev <rosenp@...il.com>
Subject: [PATCH net] net: ag71xx: remove unnecessary MTU reservation

2 bytes of the MTU are reserved for Atheros DSA tag, but DSA core
has already handled that since commit dc0fe7d47f9f.
Remove the unnecessary reservation.

Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
Signed-off-by: DENG Qingfang <dqfext@...il.com>
---
 drivers/net/ethernet/atheros/ag71xx.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
index dd5c8a9038bb..a60ce9030581 100644
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -223,8 +223,6 @@
 #define AG71XX_REG_RX_SM	0x01b0
 #define AG71XX_REG_TX_SM	0x01b4
 
-#define ETH_SWITCH_HEADER_LEN	2
-
 #define AG71XX_DEFAULT_MSG_ENABLE	\
 	(NETIF_MSG_DRV			\
 	| NETIF_MSG_PROBE		\
@@ -933,7 +931,7 @@ static void ag71xx_hw_setup(struct ag71xx *ag)
 
 static unsigned int ag71xx_max_frame_len(unsigned int mtu)
 {
-	return ETH_SWITCH_HEADER_LEN + ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
+	return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
 }
 
 static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
-- 
2.25.1