linux-kernel - [PATCH 4.2.y-ckt 205/211] gianfar: Don't enable RX Filer if not supported

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Message-Id: <1452023119-25647-206-git-send-email-kamal@canonical.com>
Date:	Tue,  5 Jan 2016 11:45:13 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Hamish Martin <hamish.martin@...iedtelesis.co.nz>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 205/211] gianfar: Don't enable RX Filer if not supported

4.2.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

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

From: Hamish Martin <hamish.martin@...iedtelesis.co.nz>

[ Upstream commit 7bff47da1ee23d00d1257905f2944c29594f799d ]

After commit 15bf176db1fb ("gianfar: Don't enable the Filer w/o the
Parser"), 'TSEC' model controllers (for example as seen on MPC8541E)
always have 8 bytes stripped from the front of received frames.
Only 'eTSEC' gianfar controllers have the RX Filer capability (amongst
other enhancements). Previously this was treated as always enabled
for both 'TSEC' and 'eTSEC' controllers.
In commit 15bf176db1fb ("gianfar: Don't enable the Filer w/o the Parser")
a subtle change was made to the setting of 'uses_rxfcb' to effectively
always set it (since 'rx_filer_enable' was always true). This had the
side-effect of always stripping 8 bytes from the front of received frames
on 'TSEC' type controllers.

We now only enable the RX Filer capability on controller types that
support it, thereby avoiding the issue for 'TSEC' type controllers.

Reviewed-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Reviewed-by: Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
Signed-off-by: Hamish Martin <hamish.martin@...iedtelesis.co.nz>
Reviewed-by: Claudiu Manoil <claudiu.manoil@...escale.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/freescale/gianfar.c | 8 +++++---
 drivers/net/ethernet/freescale/gianfar.h | 1 +
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 10b3bbbb..c2378af 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -928,7 +928,8 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
 				     FSL_GIANFAR_DEV_HAS_VLAN |
 				     FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
 				     FSL_GIANFAR_DEV_HAS_EXTENDED_HASH |
-				     FSL_GIANFAR_DEV_HAS_TIMER;
+				     FSL_GIANFAR_DEV_HAS_TIMER |
+				     FSL_GIANFAR_DEV_HAS_RX_FILER;
 
 	err = of_property_read_string(np, "phy-connection-type", &ctype);
 
@@ -1431,8 +1432,9 @@ static int gfar_probe(struct platform_device *ofdev)
 		priv->rx_queue[i]->rxic = DEFAULT_RXIC;
 	}
 
-	/* always enable rx filer */
-	priv->rx_filer_enable = 1;
+	/* Always enable rx filer if available */
+	priv->rx_filer_enable =
+	    (priv->device_flags & FSL_GIANFAR_DEV_HAS_RX_FILER) ? 1 : 0;
 	/* Enable most messages by default */
 	priv->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
 	/* use pritority h/w tx queue scheduling for single queue devices */
diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 5545e41..056b894 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -917,6 +917,7 @@ struct gfar {
 #define FSL_GIANFAR_DEV_HAS_BD_STASHING		0x00000200
 #define FSL_GIANFAR_DEV_HAS_BUF_STASHING	0x00000400
 #define FSL_GIANFAR_DEV_HAS_TIMER		0x00000800
+#define FSL_GIANFAR_DEV_HAS_RX_FILER		0x00002000
 
 #if (MAXGROUPS == 2)
 #define DEFAULT_MAPPING 	0xAA
-- 
1.9.1

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