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Diffstat (limited to 'net/batman-adv/hard-interface.c')
-rw-r--r--net/batman-adv/hard-interface.c44
1 files changed, 43 insertions, 1 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index f4a15d2e5eaf..f11345e163d7 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -252,6 +252,44 @@ static void batadv_check_known_mac_addr(const struct net_device *net_dev)
rcu_read_unlock();
}
+/**
+ * batadv_hardif_recalc_extra_skbroom() - Recalculate skbuff extra head/tailroom
+ * @soft_iface: netdev struct of the mesh interface
+ */
+static void batadv_hardif_recalc_extra_skbroom(struct net_device *soft_iface)
+{
+ const struct batadv_hard_iface *hard_iface;
+ unsigned short lower_header_len = ETH_HLEN;
+ unsigned short lower_headroom = 0;
+ unsigned short lower_tailroom = 0;
+ unsigned short needed_headroom;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+ if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
+ continue;
+
+ if (hard_iface->soft_iface != soft_iface)
+ continue;
+
+ lower_header_len = max_t(unsigned short, lower_header_len,
+ hard_iface->net_dev->hard_header_len);
+
+ lower_headroom = max_t(unsigned short, lower_headroom,
+ hard_iface->net_dev->needed_headroom);
+
+ lower_tailroom = max_t(unsigned short, lower_tailroom,
+ hard_iface->net_dev->needed_tailroom);
+ }
+ rcu_read_unlock();
+
+ needed_headroom = lower_headroom + (lower_header_len - ETH_HLEN);
+ needed_headroom += batadv_max_header_len();
+
+ soft_iface->needed_headroom = needed_headroom;
+ soft_iface->needed_tailroom = lower_tailroom;
+}
+
int batadv_hardif_min_mtu(struct net_device *soft_iface)
{
struct batadv_priv *bat_priv = netdev_priv(soft_iface);
@@ -474,6 +512,8 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
"Not using interface %s (retrying later): interface not active\n",
hard_iface->net_dev->name);
+ batadv_hardif_recalc_extra_skbroom(soft_iface);
+
/* begin scheduling originator messages on that interface */
batadv_schedule_bat_ogm(hard_iface);
@@ -528,6 +568,9 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
batadv_purge_outstanding_packets(bat_priv, hard_iface);
dev_put(hard_iface->soft_iface);
+ netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
+ batadv_hardif_recalc_extra_skbroom(hard_iface->soft_iface);
+
/* nobody uses this interface anymore */
if (!bat_priv->num_ifaces) {
batadv_gw_check_client_stop(bat_priv);
@@ -536,7 +579,6 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
batadv_softif_destroy_sysfs(hard_iface->soft_iface);
}
- netdev_upper_dev_unlink(hard_iface->net_dev, hard_iface->soft_iface);
hard_iface->soft_iface = NULL;
batadv_hardif_free_ref(hard_iface);