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net/mlx4_en: Do not count LLC/SNAP in MTU calculation

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LLC/SNAP 8 bytes should not be added as part of header calculation.
If used, payload will be decreased accordingly. For MTU of 1500
we'll set 1522 instead of 1523.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Reviewed-by: Liran Liss <liranl@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yishai Hadas 2014-07-08 11:25:23 +03:00 committed by David S. Miller
parent 49a1e4f6b7
commit d5b8dff007
2 changed files with 1 additions and 3 deletions
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2
drivers/net/ethernet/mellanox/mlx4/en_rx.c
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@ -922,7 +922,7 @@ static const int frag_sizes[] = {
void mlx4_en_calc_rx_buf(struct net_device *dev)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN;
int buf_size = 0;
int i = 0;

2
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -152,8 +152,6 @@ enum {
#define MLX4_EN_TX_POLL_MODER 16
#define MLX4_EN_TX_POLL_TIMEOUT (HZ / 4)
#define ETH_LLC_SNAP_SIZE 8
#define SMALL_PACKET_SIZE (256 - NET_IP_ALIGN)
#define HEADER_COPY_SIZE (128 - NET_IP_ALIGN)
#define MLX4_LOOPBACK_TEST_PAYLOAD (HEADER_COPY_SIZE - ETH_HLEN)