netdev - [PATCH net-next] net: systemport: tell RXCHK if we are using Broadcom tags

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Date:	Thu, 28 Aug 2014 15:11:03 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net-next] net: systemport: tell RXCHK if we are using Broadcom tags

When Broadcom tags are enabled, e.g: when interfaced to an Ethernet
switch, make sure that we tell the RXCHK engine that it should be
expecting a 4-bytes Broadcom tag after the Ethernet MAC Source Address.

Use netdev_uses_dsa() to check for that condition since that will tell
us if a switch is attached to our network interface.

Fixes: 80105befdb4b ("net: systemport: add Broadcom SYSTEMPORT Ethernet MAC driver")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/net/ethernet/broadcom/bcmsysport.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bcmsysport.c b/drivers/net/ethernet/broadcom/bcmsysport.c
index 6f4e18644bd4..8f91de169663 100644
--- a/drivers/net/ethernet/broadcom/bcmsysport.c
+++ b/drivers/net/ethernet/broadcom/bcmsysport.c
@@ -139,6 +139,15 @@ static int bcm_sysport_set_rx_csum(struct net_device *dev,
 	else
 		reg &= ~RXCHK_SKIP_FCS;
 
+	/* If Broadcom tags are enabled (e.g: using a switch), make
+	 * sure we tell the RXCHK hardware to expect a 4-bytes Broadcom
+	 * tag after the Ethernet MAC Source Address.
+	 */
+	if (netdev_uses_dsa(dev))
+		reg |= RXCHK_BRCM_TAG_EN;
+	else
+		reg &= ~RXCHK_BRCM_TAG_EN;
+
 	rxchk_writel(priv, reg, RXCHK_CONTROL);
 
 	return 0;
-- 
1.9.1

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