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authorMarek Lindner <lindner_marek@yahoo.de>2013-05-08 13:31:59 +0800
committerAntonio Quartulli <antonio@meshcoding.com>2013-10-12 17:17:09 +0200
commit411d6ed93a5d0601980d3e5ce75de07c98e3a7de (patch)
tree00a52bc5c70d465129c85d48e52ced2186649660 /net/batman-adv/hard-interface.c
parent0bf84c160a4b3b75bb911b79c3972f64dfb0b039 (diff)
batman-adv: consider network coding overhead when calculating required mtu
The module prints a warning when the MTU on the hard interface is too small to transfer payload traffic without fragmentation. The required MTU is calculated based on the encapsulation header size. If network coding is compild into the module its header size is taken into account as well. Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>
Diffstat (limited to 'net/batman-adv/hard-interface.c')
-rw-r--r--net/batman-adv/hard-interface.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index 004017c523fa..d564af295db4 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -269,9 +269,10 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
const struct batadv_priv *bat_priv = netdev_priv(soft_iface);
const struct batadv_hard_iface *hard_iface;
/* allow big frames if all devices are capable to do so
- * (have MTU > 1500 + BAT_HEADER_LEN)
+ * (have MTU > 1500 + batadv_max_header_len())
*/
int min_mtu = ETH_DATA_LEN;
+ int max_header_len = batadv_max_header_len();
if (atomic_read(&bat_priv->fragmentation))
goto out;
@@ -285,8 +286,7 @@ int batadv_hardif_min_mtu(struct net_device *soft_iface)
if (hard_iface->soft_iface != soft_iface)
continue;
- min_mtu = min_t(int,
- hard_iface->net_dev->mtu - BATADV_HEADER_LEN,
+ min_mtu = min_t(int, hard_iface->net_dev->mtu - max_header_len,
min_mtu);
}
rcu_read_unlock();
@@ -380,6 +380,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
struct batadv_priv *bat_priv;
struct net_device *soft_iface, *master;
__be16 ethertype = htons(ETH_P_BATMAN);
+ int max_header_len = batadv_max_header_len();
int ret;
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
@@ -448,18 +449,18 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
hard_iface->net_dev->name);
if (atomic_read(&bat_priv->fragmentation) &&
- hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+ hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
batadv_info(hard_iface->soft_iface,
- "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %zi would solve the problem.\n",
+ "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to %i would solve the problem.\n",
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
- ETH_DATA_LEN + BATADV_HEADER_LEN);
+ ETH_DATA_LEN + max_header_len);
if (!atomic_read(&bat_priv->fragmentation) &&
- hard_iface->net_dev->mtu < ETH_DATA_LEN + BATADV_HEADER_LEN)
+ hard_iface->net_dev->mtu < ETH_DATA_LEN + max_header_len)
batadv_info(hard_iface->soft_iface,
- "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %zi.\n",
+ "The MTU of interface %s is too small (%i) to handle the transport of batman-adv packets. If you experience problems getting traffic through try increasing the MTU to %i.\n",
hard_iface->net_dev->name, hard_iface->net_dev->mtu,
- ETH_DATA_LEN + BATADV_HEADER_LEN);
+ ETH_DATA_LEN + max_header_len);
if (batadv_hardif_is_iface_up(hard_iface))
batadv_hardif_activate_interface(hard_iface);