Repository : ssh://git@open-mesh.org/batman-adv

On branch : master

commit 8069c581f9097f1f9398f2d49047a1dab8093821 Author: Sven Eckelmann sven@narfation.org Date: Sun Oct 13 21:03:06 2019 +0200

batman-adv: Introduce own OGM2 buffer mutex

Only a single function is currently automatically locked by the rtnl_lock because (unlike B.A.T.M.A.N. IV) the OGM2 buffer is independent of the hard interfaces on which it will be transmitted. A private mutex can be used instead to avoid unnecessary delays which would have been introduced by the global lock.

Signed-off-by: Sven Eckelmann sven@narfation.org

8069c581f9097f1f9398f2d49047a1dab8093821 net/batman-adv/bat_v_ogm.c | 26 +++++++++++++++++--------- net/batman-adv/types.h | 8 ++++++-- 2 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index 034bdc5e..74452e93 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -17,11 +17,12 @@ #include <linux/kernel.h> #include <linux/kref.h> #include <linux/list.h> +#include <linux/lockdep.h> +#include <linux/mutex.h> #include <linux/netdevice.h> #include <linux/random.h> #include <linux/rculist.h> #include <linux/rcupdate.h> -#include <linux/rtnetlink.h> #include <linux/skbuff.h> #include <linux/slab.h> #include <linux/stddef.h> @@ -130,7 +131,7 @@ static void batadv_v_ogm_send_softif(struct batadv_priv *bat_priv) u16 tvlv_len = 0; int ret;

- ASSERT_RTNL(); + lockdep_assert_held(&bat_priv->bat_v.ogm_buff_mutex);

if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) goto out; @@ -230,11 +231,12 @@ static void batadv_v_ogm_send(struct work_struct *work) struct batadv_priv_bat_v *bat_v; struct batadv_priv *bat_priv;

- rtnl_lock(); bat_v = container_of(work, struct batadv_priv_bat_v, ogm_wq.work); bat_priv = container_of(bat_v, struct batadv_priv, bat_v); + + mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); batadv_v_ogm_send_softif(bat_priv); - rtnl_unlock(); + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); }

/** @@ -263,13 +265,15 @@ void batadv_v_ogm_primary_iface_set(struct batadv_hard_iface *primary_iface) struct batadv_priv *bat_priv = netdev_priv(primary_iface->soft_iface); struct batadv_ogm2_packet *ogm_packet;

- ASSERT_RTNL(); - + mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); if (!bat_priv->bat_v.ogm_buff) - return; + goto unlock;

ogm_packet = (struct batadv_ogm2_packet *)bat_priv->bat_v.ogm_buff; ether_addr_copy(ogm_packet->orig, primary_iface->net_dev->dev_addr); + +unlock: + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); }

/** @@ -873,8 +877,6 @@ int batadv_v_ogm_init(struct batadv_priv *bat_priv) unsigned char *ogm_buff; u32 random_seqno;

- ASSERT_RTNL(); - bat_priv->bat_v.ogm_buff_len = BATADV_OGM2_HLEN; ogm_buff = kzalloc(bat_priv->bat_v.ogm_buff_len, GFP_ATOMIC); if (!ogm_buff) @@ -893,6 +895,8 @@ int batadv_v_ogm_init(struct batadv_priv *bat_priv) atomic_set(&bat_priv->bat_v.ogm_seqno, random_seqno); INIT_DELAYED_WORK(&bat_priv->bat_v.ogm_wq, batadv_v_ogm_send);

+ mutex_init(&bat_priv->bat_v.ogm_buff_mutex); + return 0; }

@@ -904,7 +908,11 @@ void batadv_v_ogm_free(struct batadv_priv *bat_priv) { cancel_delayed_work_sync(&bat_priv->bat_v.ogm_wq);

+ mutex_lock(&bat_priv->bat_v.ogm_buff_mutex); + kfree(bat_priv->bat_v.ogm_buff); bat_priv->bat_v.ogm_buff = NULL; bat_priv->bat_v.ogm_buff_len = 0; + + mutex_unlock(&bat_priv->bat_v.ogm_buff_mutex); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 282a4650..eded9167 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -17,6 +17,7 @@ #include <linux/if.h> #include <linux/if_ether.h> #include <linux/kref.h> +#include <linux/mutex.h> #include <linux/netdevice.h> #include <linux/netlink.h> #include <linux/sched.h> /* for linux/wait.h */ @@ -1518,15 +1519,18 @@ struct batadv_softif_vlan { * struct batadv_priv_bat_v - B.A.T.M.A.N. V per soft-interface private data */ struct batadv_priv_bat_v { - /** @ogm_buff: buffer holding the OGM packet. rtnl protected */ + /** @ogm_buff: buffer holding the OGM packet */ unsigned char *ogm_buff;

- /** @ogm_buff_len: length of the OGM packet buffer. rtnl protected */ + /** @ogm_buff_len: length of the OGM packet buffer */ int ogm_buff_len;

/** @ogm_seqno: OGM sequence number - used to identify each OGM */ atomic_t ogm_seqno;

+ /** @ogm_buff_mutex: lock protecting ogm_buff and ogm_buff_len */ + struct mutex ogm_buff_mutex; + /** @ogm_wq: workqueue used to schedule OGM transmissions */ struct delayed_work ogm_wq; };