From: Julan Hsu <julanhsu@xxxxxxxxxx>
Expose path change count to destination in mpath info
Signed-off-by: Julan Hsu <julanhsu@xxxxxxxxxx>
---
include/net/cfg80211.h | 5 ++++-
include/uapi/linux/nl80211.h | 4 +++-
net/mac80211/cfg.c | 4 +++-
net/mac80211/mesh.h | 2 ++
net/mac80211/mesh_hwmp.c | 4 ++++
net/wireless/nl80211.c | 5 ++++-
6 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 6be50a550a13..4e5fb1daf0a1 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1427,7 +1427,8 @@ enum mpath_info_flags {
MPATH_INFO_DISCOVERY_TIMEOUT = BIT(4),
MPATH_INFO_DISCOVERY_RETRIES = BIT(5),
MPATH_INFO_FLAGS = BIT(6),
- MPATH_INFO_HOP_COUNT = BIT(7)
+ MPATH_INFO_HOP_COUNT = BIT(7),
+ MPATH_INFO_PATH_CHANGE = BIT(8)
};
/**
@@ -1448,6 +1449,7 @@ enum mpath_info_flags {
* changes, i.e. when a station is added or removed, so that
* userspace can tell whether it got a consistent snapshot.
* @hop_count: hops to destination
+ * @path_change_count: total number of path changes to destination
*/
struct mpath_info {
u32 filled;
@@ -1459,6 +1461,7 @@ struct mpath_info {
u8 discovery_retries;
u8 flags;
u8 hop_count;
+ u32 path_change_count;
int generation;
};
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index fcfca197be59..1e24d236f675 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3226,8 +3226,9 @@ enum nl80211_mpath_flags {
* @NL80211_MPATH_INFO_DISCOVERY_TIMEOUT: total path discovery timeout, in msec
* @NL80211_MPATH_INFO_DISCOVERY_RETRIES: mesh path discovery retries
* @NL80211_MPATH_INFO_HOP_COUNT: hop count to destination
+ * @NL80211_MPATH_INFO_PATH_CHANGE: total number of path changes to destination
* @NL80211_MPATH_INFO_MAX: highest mesh path information attribute number
- * currently defind
+ * currently defined
* @__NL80211_MPATH_INFO_AFTER_LAST: internal use
*/
enum nl80211_mpath_info {
@@ -3240,6 +3241,7 @@ enum nl80211_mpath_info {
NL80211_MPATH_INFO_DISCOVERY_TIMEOUT,
NL80211_MPATH_INFO_DISCOVERY_RETRIES,
NL80211_MPATH_INFO_HOP_COUNT,
+ NL80211_MPATH_INFO_PATH_CHANGE,
/* keep last */
__NL80211_MPATH_INFO_AFTER_LAST,
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 8e756ac076ad..aba2f6cbdc4f 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1743,7 +1743,8 @@ static void mpath_set_pinfo(struct mesh_path *mpath, u8 *next_hop,
MPATH_INFO_DISCOVERY_TIMEOUT |
MPATH_INFO_DISCOVERY_RETRIES |
MPATH_INFO_FLAGS |
- MPATH_INFO_HOP_COUNT;
+ MPATH_INFO_HOP_COUNT |
+ MPATH_INFO_PATH_CHANGE;
pinfo->frame_qlen = mpath->frame_queue.qlen;
pinfo->sn = mpath->sn;
@@ -1764,6 +1765,7 @@ static void mpath_set_pinfo(struct mesh_path *mpath, u8 *next_hop,
if (mpath->flags & MESH_PATH_RESOLVED)
pinfo->flags |= NL80211_MPATH_FLAG_RESOLVED;
pinfo->hop_count = mpath->hop_count;
+ pinfo->path_change_count = mpath->path_change_count;
}
static int ieee80211_get_mpath(struct wiphy *wiphy, struct net_device *dev,
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index 21526630bf65..dbb43e9454e0 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -94,6 +94,7 @@ enum mesh_deferred_task_flags {
* @last_preq_to_root: Timestamp of last PREQ sent to root
* @is_root: the destination station of this path is a root node
* @is_gate: the destination station of this path is a mesh gate
+ * @path_change_count: the number of path changes to destination
*
*
* The dst address is unique in the mesh path table. Since the mesh_path is
@@ -124,6 +125,7 @@ struct mesh_path {
unsigned long last_preq_to_root;
bool is_root;
bool is_gate;
+ u32 path_change_count;
};
/**
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 6d1190b3332f..a0aebf44493f 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -479,6 +479,8 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
}
if (fresh_info) {
+ if (rcu_access_pointer(mpath->next_hop) != sta)
+ mpath->path_change_count++;
mesh_path_assign_nexthop(mpath, sta);
mpath->flags |= MESH_PATH_SN_VALID;
mpath->metric = new_metric;
@@ -523,6 +525,8 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
}
if (fresh_info) {
+ if (rcu_access_pointer(mpath->next_hop) != sta)
+ mpath->path_change_count++;
mesh_path_assign_nexthop(mpath, sta);
mpath->metric = last_hop_metric;
mpath->exp_time = time_after(mpath->exp_time, exp_time)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 442c02415aed..3fde570f1cf3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5644,7 +5644,10 @@ static int nl80211_send_mpath(struct sk_buff *msg, u32 portid, u32 seq,
pinfo->discovery_retries)) ||
((pinfo->filled & MPATH_INFO_HOP_COUNT) &&
nla_put_u8(msg, NL80211_MPATH_INFO_HOP_COUNT,
- pinfo->hop_count)))
+ pinfo->hop_count)) ||
+ ((pinfo->filled & MPATH_INFO_PATH_CHANGE) &&
+ nla_put_u32(msg, NL80211_MPATH_INFO_PATH_CHANGE,
+ pinfo->path_change_count)))
goto nla_put_failure;
nla_nest_end(msg, pinfoattr);
--
2.20.1.97.g81188d93c3-goog
