8139too: Allow using the largest possible MTU

This driver allows MTU up to 1518 bytes which is not enought to run
batman-adv. Simply raise the maximum packet size up to the maximum
allowed by the transmit descriptor, 1792 bytes, giving a maximum MTU
of 1774 bytes.

Signed-off-by: Alban Bedel <albeu@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index 8387de985c06..e157541b842b 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -183,7 +183,7 @@ static int debug = -1;
 #define NUM_TX_DESC     4
 
 /* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/
-#define MAX_ETH_FRAME_SIZE      1536
+#define MAX_ETH_FRAME_SIZE      1792
 
 /* max supported payload size */
 #define MAX_ETH_DATA_SIZE       (MAX_ETH_FRAME_SIZE - ETH_HLEN - ETH_FCS_LEN)