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8139too: The maximum MTU should allow for VLAN headers 

As pointed out by Ben Hutchings drivers that allow using VLAN have to
provide enough headroom for the VLAN tags.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alban Bedel 2014-11-23 13:07:54 +01:00 committed by David S. Miller
parent d543a76295
commit 2bbea0a885
1 changed files with 4 additions and 3 deletions
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7
drivers/net/ethernet/realtek/8139too.c
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@ -112,6 +112,7 @@
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/gfp.h>
#include <linux/if_vlan.h>
#include <asm/irq.h>
#define RTL8139_DRIVER_NAME DRV_NAME " Fast Ethernet driver " DRV_VERSION
@ -182,13 +183,13 @@ static int debug = -1;
/* Number of Tx descriptor registers. */
#define NUM_TX_DESC 4
/* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/
/* max supported ethernet frame size -- must be at least (dev->mtu+18+4).*/
#define MAX_ETH_FRAME_SIZE 1792
/* max supported payload size */
#define MAX_ETH_DATA_SIZE (MAX_ETH_FRAME_SIZE - ETH_HLEN - ETH_FCS_LEN)
#define MAX_ETH_DATA_SIZE (MAX_ETH_FRAME_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN)
/* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */
/* Size of the Tx bounce buffers -- must be at least (dev->mtu+18+4). */
#define TX_BUF_SIZE MAX_ETH_FRAME_SIZE
#define TX_BUF_TOT_LEN (TX_BUF_SIZE * NUM_TX_DESC)