mlxsw: switchx2: Don't count internal TX header bytes to stats

Stop the SW TX counter from counting the TX header bytes
since they are not being sent out.

Fixes: e577516b9db3 ("mlxsw: Fix use-after-free bug in mlxsw_sx_port_xmit")
Signed-off-by: Nogah Frankel <nogahf@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/switchx2.c b/drivers/net/ethernet/mellanox/mlxsw/switchx2.c
index 3842eab..25f658b 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/switchx2.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/switchx2.c
@@ -316,7 +316,10 @@ static netdev_tx_t mlxsw_sx_port_xmit(struct sk_buff *skb,
                }
        }
        mlxsw_sx_txhdr_construct(skb, &tx_info);
-       len = skb->len;
+       /* TX header is consumed by HW on the way so we shouldn't count its
+        * bytes as being sent.
+        */
+       len = skb->len - MLXSW_TXHDR_LEN;
        /* Due to a race we might fail here because of a full queue. In that
         * unlikely case we simply drop the packet.
         */