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lantiq: fix maximum ethernet header length 

The total ethernet frame length should be written to the hardware
register LTQ_ETOP_IGPLEN instead of just the value of the MTU. This
patch fixes network issues on various Danube boards, especially when
VLAN tagging is enabled.

Signed-off-by: Matti Laakso <malaakso at elisanet.fi>

SVN-Revision: 40541
owl
John Crispin 2014-04-22 08:07:53 +00:00
parent 248678fccd
commit cdc53e2ec9
1 changed files with 22 additions and 0 deletions
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22
target/linux/lantiq/patches-3.10/0207-NET-fix-etop-igplen.patch Normal file
View File

@ -0,0 +1,22 @@
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -31,6 +31,7 @@
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/ethtool.h>
+#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/io.h>
@@ -764,8 +765,10 @@ ltq_etop_change_mtu(struct net_device *d
struct ltq_etop_priv *priv = netdev_priv(dev);
unsigned long flags;
+ int max = ETH_HLEN + VLAN_HLEN + new_mtu + ETH_FCS_LEN;
+
spin_lock_irqsave(&priv->lock, flags);
- ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu,
+ ltq_etop_w32((ETOP_PLEN_UNDER << 16) | max,
LTQ_ETOP_IGPLEN);
spin_unlock_irqrestore(&priv->lock, flags);
}