diff mbox

[v3,2/2] batman-adv: Use own timer for multicast TT and TVLV updates

Message ID 1470514996-32044-2-git-send-email-linus.luessing@c0d3.blue
State Accepted, archived
Commit 40b384052672ba06cd2a764e3d87f947d0fd6891
Delegated to: Sven Eckelmann
Headers show

Commit Message

Linus Lüssing Aug. 6, 2016, 8:23 p.m. UTC
Instead of latching onto the OGM period, this patch introduces a worker
dedicated to multicast TT and TVLV updates.

The reasoning is, that upon roaming especially the translation table
should be updated timely to minimize connectivity issues.

With BATMAN V, the idea is to greatly increase the OGM interval to
reduce overhead. Unfortunately, right now this could lead to
a bad user experience if multicast traffic is involved.

Therefore this patch introduces a fixed 500ms update interval for
multicast TT entries and the multicast TVLV.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---

Changes in v3:
* added missing #includes
* fixed parameter kerneldoc of batadv_mcast_mla_update()

Changes in v2:
* updated kerneldoc regarding bat_priv->mcast.mla_list "locking"

 net/batman-adv/main.h              |  1 +
 net/batman-adv/multicast.c         | 62 ++++++++++++++++++++++++++++++++++----
 net/batman-adv/multicast.h         |  6 ----
 net/batman-adv/translation-table.c |  4 ---
 net/batman-adv/types.h             |  4 ++-
 5 files changed, 60 insertions(+), 17 deletions(-)

Comments

Sven Eckelmann Aug. 6, 2016, 8:48 p.m. UTC | #1
On Samstag, 6. August 2016 22:23:16 CEST Linus Lüssing wrote:
> Instead of latching onto the OGM period, this patch introduces a worker
> dedicated to multicast TT and TVLV updates.
> 
> The reasoning is, that upon roaming especially the translation table
> should be updated timely to minimize connectivity issues.
> 
> With BATMAN V, the idea is to greatly increase the OGM interval to
> reduce overhead. Unfortunately, right now this could lead to
> a bad user experience if multicast traffic is involved.
> 
> Therefore this patch introduces a fixed 500ms update interval for
> multicast TT entries and the multicast TVLV.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
> ---
> 
> Changes in v3:
> * added missing #includes
> * fixed parameter kerneldoc of batadv_mcast_mla_update()
> 
> Changes in v2:
> * updated kerneldoc regarding bat_priv->mcast.mla_list "locking"

Reviewed-by: Sven Eckelmann <sven@narfation.org>

Kind regards,
	Sven
Sven Eckelmann Oct. 19, 2016, 9:20 a.m. UTC | #2
On Samstag, 6. August 2016 22:23:16 CEST Linus Lüssing wrote:
> Instead of latching onto the OGM period, this patch introduces a worker
> dedicated to multicast TT and TVLV updates.
> 
> The reasoning is, that upon roaming especially the translation table
> should be updated timely to minimize connectivity issues.
> 
> With BATMAN V, the idea is to greatly increase the OGM interval to
> reduce overhead. Unfortunately, right now this could lead to
> a bad user experience if multicast traffic is involved.
> 
> Therefore this patch introduces a fixed 500ms update interval for
> multicast TT entries and the multicast TVLV.
> 
> Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
> Reviewed-by: Sven Eckelmann <sven@narfation.org>
> ---
> 
> Changes in v3:
> * added missing #includes
> * fixed parameter kerneldoc of batadv_mcast_mla_update()
> 
> Changes in v2:
> * updated kerneldoc regarding bat_priv->mcast.mla_list "locking"
> 
>  net/batman-adv/main.h              |  1 +
>  net/batman-adv/multicast.c         | 62
> ++++++++++++++++++++++++++++++++++---- net/batman-adv/multicast.h         |
>  6 ----
>  net/batman-adv/translation-table.c |  4 ---
>  net/batman-adv/types.h             |  4 ++-
>  5 files changed, 60 insertions(+), 17 deletions(-)


Applied in 40b384052672ba06cd2a764e3d87f947d0fd6891 [1].

Kind regards,
        Sven

[1] https://git.open-mesh.org/batman-adv.git/commit/40b384052672ba06cd2a764e3d87f947d0fd6891
diff mbox

Patch

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index 06a8608..edb8427 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -48,6 +48,7 @@ 
 #define BATADV_TT_CLIENT_TEMP_TIMEOUT 600000 /* in milliseconds */
 #define BATADV_TT_WORK_PERIOD 5000 /* 5 seconds */
 #define BATADV_ORIG_WORK_PERIOD 1000 /* 1 second */
+#define BATADV_MCAST_WORK_PERIOD 500 /* 0.5 seconds */
 #define BATADV_DAT_ENTRY_TIMEOUT (5 * 60000) /* 5 mins in milliseconds */
 /* sliding packet range of received originator messages in sequence numbers
  * (should be a multiple of our word size)
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 45757fa..090a69f 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -33,6 +33,7 @@ 
 #include <linux/in6.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
+#include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
@@ -48,6 +49,7 @@ 
 #include <linux/stddef.h>
 #include <linux/string.h>
 #include <linux/types.h>
+#include <linux/workqueue.h>
 #include <net/addrconf.h>
 #include <net/if_inet6.h>
 #include <net/ip.h>
@@ -60,6 +62,18 @@ 
 #include "translation-table.h"
 #include "tvlv.h"
 
+static void batadv_mcast_mla_update(struct work_struct *work);
+
+/**
+ * batadv_mcast_start_timer - schedule the multicast periodic worker
+ * @bat_priv: the bat priv with all the soft interface information
+ */
+static void batadv_mcast_start_timer(struct batadv_priv *bat_priv)
+{
+	queue_delayed_work(batadv_event_workqueue, &bat_priv->mcast.work,
+			   msecs_to_jiffies(BATADV_MCAST_WORK_PERIOD));
+}
+
 /**
  * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists
  * @soft_iface: netdev struct of the mesh interface
@@ -255,6 +269,8 @@  static void batadv_mcast_mla_list_free(struct hlist_head *mcast_list)
  * translation table except the ones listed in the given mcast_list.
  *
  * If mcast_list is NULL then all are retracted.
+ *
+ * Do not call outside of the mcast worker! (or cancel mcast worker first)
  */
 static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
 					struct hlist_head *mcast_list)
@@ -262,7 +278,7 @@  static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
 	struct batadv_hw_addr *mcast_entry;
 	struct hlist_node *tmp;
 
-	lockdep_assert_held(&bat_priv->tt.commit_lock);
+	WARN_ON(delayed_work_pending(&bat_priv->mcast.work));
 
 	hlist_for_each_entry_safe(mcast_entry, tmp, &bat_priv->mcast.mla_list,
 				  list) {
@@ -287,6 +303,8 @@  static void batadv_mcast_mla_tt_retract(struct batadv_priv *bat_priv,
  *
  * Adds multicast listener announcements from the given mcast_list to the
  * translation table if they have not been added yet.
+ *
+ * Do not call outside of the mcast worker! (or cancel mcast worker first)
  */
 static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
 				    struct hlist_head *mcast_list)
@@ -294,7 +312,7 @@  static void batadv_mcast_mla_tt_add(struct batadv_priv *bat_priv,
 	struct batadv_hw_addr *mcast_entry;
 	struct hlist_node *tmp;
 
-	lockdep_assert_held(&bat_priv->tt.commit_lock);
+	WARN_ON(delayed_work_pending(&bat_priv->mcast.work));
 
 	if (!mcast_list)
 		return;
@@ -528,13 +546,18 @@  update:
 }
 
 /**
- * batadv_mcast_mla_update - update the own MLAs
+ * __batadv_mcast_mla_update - update the own MLAs
  * @bat_priv: the bat priv with all the soft interface information
  *
  * Updates the own multicast listener announcements in the translation
  * table as well as the own, announced multicast tvlv container.
+ *
+ * Note that non-conflicting reads and writes to bat_priv->mcast.mla_list
+ * in batadv_mcast_mla_tt_retract() and batadv_mcast_mla_tt_add() are
+ * ensured by the non-parallel execution of the worker this function
+ * belongs to.
  */
-void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
+static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv)
 {
 	struct net_device *soft_iface = bat_priv->soft_iface;
 	struct hlist_head mcast_list = HLIST_HEAD_INIT;
@@ -560,6 +583,29 @@  out:
 }
 
 /**
+ * batadv_mcast_mla_update - update the own MLAs
+ * @work: kernel work struct
+ *
+ * Updates the own multicast listener announcements in the translation
+ * table as well as the own, announced multicast tvlv container.
+ *
+ * In the end, reschedules the work timer.
+ */
+static void batadv_mcast_mla_update(struct work_struct *work)
+{
+	struct delayed_work *delayed_work;
+	struct batadv_priv_mcast *priv_mcast;
+	struct batadv_priv *bat_priv;
+
+	delayed_work = to_delayed_work(work);
+	priv_mcast = container_of(delayed_work, struct batadv_priv_mcast, work);
+	bat_priv = container_of(priv_mcast, struct batadv_priv, mcast);
+
+	__batadv_mcast_mla_update(bat_priv);
+	batadv_mcast_start_timer(bat_priv);
+}
+
+/**
  * batadv_mcast_is_report_ipv4 - check for IGMP reports
  * @skb: the ethernet frame destined for the mesh
  *
@@ -1128,6 +1174,9 @@  void batadv_mcast_init(struct batadv_priv *bat_priv)
 	batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
 				     NULL, BATADV_TVLV_MCAST, 2,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
+
+	INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
+	batadv_mcast_start_timer(bat_priv);
 }
 
 #ifdef CONFIG_BATMAN_ADV_DEBUGFS
@@ -1239,12 +1288,13 @@  int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset)
  */
 void batadv_mcast_free(struct batadv_priv *bat_priv)
 {
+	cancel_delayed_work_sync(&bat_priv->mcast.work);
+
 	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
 	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 2);
 
-	spin_lock_bh(&bat_priv->tt.commit_lock);
+	/* safely calling outside of worker, as worker was canceled above */
 	batadv_mcast_mla_tt_retract(bat_priv, NULL);
-	spin_unlock_bh(&bat_priv->tt.commit_lock);
 }
 
 /**
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index 1fb00ba..2cddaf5 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -39,8 +39,6 @@  enum batadv_forw_mode {
 
 #ifdef CONFIG_BATMAN_ADV_MCAST
 
-void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
-
 enum batadv_forw_mode
 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		       struct batadv_orig_node **mcast_single_orig);
@@ -55,10 +53,6 @@  void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
 
 #else
 
-static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
-{
-}
-
 static inline enum batadv_forw_mode
 batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 		       struct batadv_orig_node **mcast_single_orig)
diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 7f66309..2157bca 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -56,7 +56,6 @@ 
 #include "hard-interface.h"
 #include "hash.h"
 #include "log.h"
-#include "multicast.h"
 #include "netlink.h"
 #include "originator.h"
 #include "packet.h"
@@ -3795,9 +3794,6 @@  static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
 {
 	lockdep_assert_held(&bat_priv->tt.commit_lock);
 
-	/* Update multicast addresses in local translation table */
-	batadv_mcast_mla_update(bat_priv);
-
 	if (atomic_read(&bat_priv->tt.local_changes) < 1) {
 		if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
 			batadv_tt_tvlv_container_update(bat_priv);
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index b3dd1a3..ba0ea1e 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -785,9 +785,10 @@  struct batadv_mcast_querier_state {
  * @num_want_all_ipv6: counter for items in want_all_ipv6_list
  * @want_lists_lock: lock for protecting modifications to mcast want lists
  *  (traversals are rcu-locked)
+ * @work: work queue callback item for multicast TT and TVLV updates
  */
 struct batadv_priv_mcast {
-	struct hlist_head mla_list;
+	struct hlist_head mla_list; /* see __batadv_mcast_mla_update() */
 	struct hlist_head want_all_unsnoopables_list;
 	struct hlist_head want_all_ipv4_list;
 	struct hlist_head want_all_ipv6_list;
@@ -802,6 +803,7 @@  struct batadv_priv_mcast {
 	atomic_t num_want_all_ipv6;
 	/* protects want_all_{unsnoopables,ipv4,ipv6}_list */
 	spinlock_t want_lists_lock;
+	struct delayed_work work;
 };
 #endif