netdev - [PATCH 2/2] ucc_geth: Add 16 bytes to max TX frame for VLANs

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Date:	Mon, 30 Apr 2012 10:36:55 +0200
From:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:	Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
Subject: [PATCH 2/2] ucc_geth: Add 16 bytes to max TX frame for VLANs

Creating a VLAN interface on top of ucc_geth adds 4 bytes
to the frame and the HW controller is not prepared to
TX a frame bigger than 1518 bytes which is 4 bytes too
small for a full VLAN frame. Add 16 bytes which will handle
the a simple VLAN and leaves 12 bytes for future expansion.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
---
 drivers/net/ethernet/freescale/ucc_geth.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
index ba2dc08..638c8cb 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -116,10 +116,10 @@ static struct ucc_geth_info ugeth_primary_info = {
 	.maxGroupAddrInHash = 4,
 	.maxIndAddrInHash = 4,
 	.prel = 7,
-	.maxFrameLength = 1518,
+	.maxFrameLength = 1518+16, /* Add extra bytes for VLANs etc. */
 	.minFrameLength = 64,
-	.maxD1Length = 1520,
-	.maxD2Length = 1520,
+	.maxD1Length = 1520+16, /* Add extra bytes for VLANs etc. */
+	.maxD2Length = 1520+16, /* Add extra bytes for VLANs etc. */
 	.vlantype = 0x8100,
 	.ecamptr = ((uint32_t) NULL),
 	.eventRegMask = UCCE_OTHER,
-- 
1.7.3.4

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