Subject: [PATCH] mac80211 : Add support to track mesh peer beacon miss event

From: Hari Chandrakanthan <[email protected]>

Mesh peer beacon miss log helps in debugging mesh connectivity
related issues.

Set dbg_mask to track the mesh peer beacon miss event
cmd to set dbg_mask :
echo 0xN > /sys/kernel/debug/ieee80211/phyX/dbg_mask
N - 0,1

Set the timer period using bmiss_threshold.
cmd to set bmiss_threshold:
echo N > /sys/kernel/debug/ieee80211/phyX/netdev\:wlanX/bmiss_threshold
N - 1 to 255

Signed-off-by: Hari Chandrakanthan <[email protected]>
---
include/net/mac80211.h | 20 ++++++++++++
net/mac80211/debugfs.c | 36 ++++++++++++++++++++++
net/mac80211/debugfs_netdev.c | 28 +++++++++++++++++
net/mac80211/mesh.c | 5 +++
net/mac80211/mesh.h | 4 +++
net/mac80211/mesh_plink.c | 71 +++++++++++++++++++++++++++++++++++++++++++
net/mac80211/sta_info.c | 1 +
net/mac80211/sta_info.h | 7 +++++
8 files changed, 172 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index b8e8c82..5ce5f7a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1732,6 +1732,9 @@ enum ieee80211_offload_flags {
* for read access.
* @color_change_color: the bss color that will be used after the change.
* @mbssid_tx_vif: Pointer to the transmitting interface if MBSSID is enabled.
+ * @bmiss_threshold: beacon miss threshold that is used to change the beacon miss
+ * timer value
+ *
*/
struct ieee80211_vif {
enum nl80211_iftype type;
@@ -1764,6 +1767,7 @@ struct ieee80211_vif {
u8 color_change_color;

struct ieee80211_vif *mbssid_tx_vif;
+ u8 bmiss_threshold;

/* must be last */
u8 drv_priv[] __aligned(sizeof(void *));
@@ -2495,6 +2499,19 @@ enum ieee80211_hw_flags {
};

/**
+ * enum ieee80211_dbg_mask - Debug mask to enable and disable logs
+ * in runtime
+ *
+ * @IEEE80211_HW_DBG_BMISS_LOG - To enable/disable mesh beacon miss logs
+ *
+ * @IEEE80211_HW_MAX_DBG_MASK - Max debug mask value
+ */
+enum ieee80211_dbg_mask {
+ IEEE80211_HW_DBG_BMISS_LOG = BIT(0),
+ IEEE80211_HW_MAX_DBG_MASK = BIT(1)
+};
+
+/**
* struct ieee80211_hw - hardware information and state
*
* This structure contains the configuration and hardware
@@ -2618,6 +2635,8 @@ enum ieee80211_hw_flags {
* refilling deficit of each TXQ.
*
* @max_mtu: the max mtu could be set.
+ *
+ * @dbg_mask: debug mask
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@@ -2656,6 +2675,7 @@ struct ieee80211_hw {
u8 tx_sk_pacing_shift;
u8 weight_multiplier;
u32 max_mtu;
+ u32 dbg_mask;
};

static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index f4c9a92..17470f3 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -422,6 +422,41 @@ static const struct file_operations airtime_ops = {
.llseek = default_llseek,
};

+static ssize_t dbg_mask_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ieee80211_local *local = file->private_data;
+ char buf[128];
+ int len;
+
+ len = scnprintf(buf, sizeof(buf), "0x%x\n", local->hw.dbg_mask);
+
+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t dbg_mask_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ieee80211_local *local = file->private_data;
+ int ret;
+ u32 mask;
+
+ ret = kstrtou32_from_user(user_buf, count, 0, &mask);
+ if (ret || mask >= IEEE80211_HW_MAX_DBG_MASK)
+ return -EINVAL;
+
+ local->hw.dbg_mask = mask;
+
+ return count;
+}
+
+static const struct file_operations dbg_mask_ops = {
+ .write = dbg_mask_write,
+ .read = dbg_mask_read,
+ .open = simple_open,
+ .llseek = default_llseek,
+};
+
#ifdef CONFIG_PM
static ssize_t reset_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
@@ -670,6 +705,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
DEBUGFS_ADD(hw_conf);
DEBUGFS_ADD_MODE(force_tx_status, 0600);
DEBUGFS_ADD_MODE(aql_enable, 0600);
+ DEBUGFS_ADD_MODE(dbg_mask, 0600);

if (local->ops->wake_tx_queue)
DEBUGFS_ADD_MODE(aqm, 0600);
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index e490c3d..51cc7b0 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -297,6 +297,32 @@ static ssize_t ieee80211_if_parse_smps(struct ieee80211_sub_if_data *sdata,
}
IEEE80211_IF_FILE_RW(smps);

+static ssize_t ieee80211_if_fmt_bmiss_threshold(const struct ieee80211_sub_if_data *sdata,
+ char *buf, int buflen)
+{
+ return snprintf(buf, buflen, "%u\n", sdata->vif.bmiss_threshold);
+}
+
+static ssize_t ieee80211_if_parse_bmiss_threshold(struct ieee80211_sub_if_data *sdata,
+ const char *buf, int buflen)
+{
+ int ret;
+ u8 val;
+
+ ret = kstrtou8(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (!val)
+ return -EINVAL;
+
+ sdata->vif.bmiss_threshold = val;
+
+ return buflen;
+}
+
+IEEE80211_IF_FILE_RW(bmiss_threshold);
+
static ssize_t ieee80211_if_parse_tkip_mic_test(
struct ieee80211_sub_if_data *sdata, const char *buf, int buflen)
{
@@ -711,6 +737,7 @@ static void add_ap_files(struct ieee80211_sub_if_data *sdata)
DEBUGFS_ADD(num_buffered_multicast);
DEBUGFS_ADD_MODE(tkip_mic_test, 0200);
DEBUGFS_ADD_MODE(multicast_to_unicast, 0600);
+ DEBUGFS_ADD_MODE(bmiss_threshold, 0600);
}

static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
@@ -731,6 +758,7 @@ static void add_mesh_files(struct ieee80211_sub_if_data *sdata)
{
DEBUGFS_ADD_MODE(tsf, 0600);
DEBUGFS_ADD_MODE(estab_plinks, 0400);
+ DEBUGFS_ADD_MODE(bmiss_threshold, 0600);
}

static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 5275f4f..5e54e6f 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -163,6 +163,8 @@ void mesh_sta_cleanup(struct sta_info *sta)
struct ieee80211_sub_if_data *sdata = sta->sdata;
u32 changed = mesh_plink_deactivate(sta);

+ del_timer_sync(&sta->mesh->bmiss_timer);
+
if (changed)
ieee80211_mbss_info_change_notify(sdata, changed);
}
@@ -1359,6 +1361,9 @@ static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
!sdata->vif.csa_active)
ieee80211_mesh_process_chnswitch(sdata, elems, true);
+
+ if (stype != IEEE80211_STYPE_PROBE_RESP)
+ mesh_bmiss_update(sdata, mgmt, elems, rx_status);
}

if (ifmsh->sync_ops)
diff --git a/net/mac80211/mesh.h b/net/mac80211/mesh.h
index b2b717a..2c2240d 100644
--- a/net/mac80211/mesh.h
+++ b/net/mac80211/mesh.h
@@ -263,6 +263,9 @@ int mesh_path_send_to_gates(struct mesh_path *mpath);
int mesh_gate_num(struct ieee80211_sub_if_data *sdata);
u32 airtime_link_metric_get(struct ieee80211_local *local,
struct sta_info *sta);
+void mesh_bmiss_update(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, struct ieee802_11_elems *ie,
+ struct ieee80211_rx_status *rx_status);

/* Mesh plinks */
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
@@ -298,6 +301,7 @@ void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata,
void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);

bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);
+void mesh_bmiss_event(struct timer_list *t);

#ifdef CONFIG_MAC80211_MESH
static inline
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index a829470..ac693c4 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -594,6 +594,77 @@ mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
}

/*
+ * mesh_bmiss_update - update beacon miss parameters such as
+ * beacon count, beacon interval and timeout of beacon miss
+ * timer
+ *
+ * @sdata: local meshif
+ * @mgmt: mgmt frame info
+ * @elems: IEs from beacon or mesh peering frame.
+ * @rx_status: rx status for the frame for signal reporting
+ *
+ */
+
+void mesh_bmiss_update(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ struct ieee802_11_elems *elems,
+ struct ieee80211_rx_status *rx_status)
+{
+ struct sta_info *sta;
+ u32 timeout;
+
+ /* mesh_sta_info_get api returns with rcu_read_lock */
+ sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
+ if (!sta)
+ goto unlock_rcu;
+
+ if (!(sta->local->hw.dbg_mask & IEEE80211_HW_DBG_BMISS_LOG) ||
+ !sta->sdata->vif.bmiss_threshold)
+ goto unlock_rcu;
+
+ sta->mesh->bmiss_count = 0;
+ sta->mesh->beacon_int = mgmt->u.beacon.beacon_int;
+ timeout = sta->mesh->beacon_int * sta->sdata->vif.bmiss_threshold;
+
+ mod_timer(&sta->mesh->bmiss_timer, (jiffies + msecs_to_jiffies(timeout)));
+
+unlock_rcu:
+ rcu_read_unlock();
+}
+
+/*
+ * mesh_bmiss_event - counts the beacon miss events and updates
+ * beacon miss timer
+ * @timer - beacon miss timer
+ *
+ */
+
+void mesh_bmiss_event(struct timer_list *timer)
+{
+ struct mesh_sta *mesh = from_timer(mesh, timer, bmiss_timer);
+ struct sta_info *sta;
+ u32 timeout;
+
+ rcu_read_lock();
+ sta = mesh->plink_sta;
+
+ if (!(sta->local->hw.dbg_mask & IEEE80211_HW_DBG_BMISS_LOG) ||
+ !sta->sdata->vif.bmiss_threshold)
+ goto unlock_rcu;
+
+ mesh->bmiss_count++;
+ sdata_info(sta->sdata, "Beacon miss count %u from %pM\n",
+ mesh->bmiss_count, sta->sta.addr);
+
+ timeout = sta->mesh->beacon_int * sta->sdata->vif.bmiss_threshold;
+
+ mod_timer(&sta->mesh->bmiss_timer, (jiffies + msecs_to_jiffies(timeout)));
+
+unlock_rcu:
+ rcu_read_unlock();
+}
+
+/*
* mesh_neighbour_update - update or initialize new mesh neighbor.
*
* @sdata: local meshif
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 91fbb1e..66ea62c 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -367,6 +367,7 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
if (!sdata->u.mesh.user_mpm)
timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
0);
+ timer_setup(&sta->mesh->bmiss_timer, mesh_bmiss_event, 0);
sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
}
#endif
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 379fd36..c95d03eb 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -397,6 +397,9 @@ DECLARE_EWMA(mesh_tx_rate_avg, 8, 16)
* @connected_to_as: true if mesh STA has a path to a authentication server
* @fail_avg: moving percentage of failed MSDUs
* @tx_rate_avg: moving average of tx bitrate
+ * @bmiss_count: beacon miss count
+ * @bmiss_timer: timer to capture missed beacons
+ * @beacon_int: beacon interval
*/
struct mesh_sta {
struct timer_list plink_timer;
@@ -424,6 +427,10 @@ struct mesh_sta {
enum nl80211_mesh_power_mode peer_pm;
enum nl80211_mesh_power_mode nonpeer_pm;

+ struct timer_list bmiss_timer;
+ u32 bmiss_count;
+ u32 beacon_int;
+
/* moving percentage of failed MSDUs */
struct ewma_mesh_fail_avg fail_avg;
/* moving average of tx bitrate */
--
2.7.4



2022-06-06 06:14:11

by kernel test robot

[permalink] [raw]
Subject: Re: [PATCH] mac80211 : Add support to track mesh peer beacon miss event

Hi,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on v5.18]
[cannot apply to wireless-next/main wireless/main next-20220603]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/intel-lab-lkp/linux/commits/quic_haric-quicinc-com/mac80211-Add-support-to-track-mesh-peer-beacon-miss-event/20220530-145016
base: 4b0986a3613c92f4ec1bdc7f60ec66fea135991f
config: h8300-randconfig-s031-20220603 (https://download.01.org/0day-ci/archive/20220604/[email protected]/config)
compiler: h8300-linux-gcc (GCC) 11.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-18-g56afb504-dirty
# https://github.com/intel-lab-lkp/linux/commit/e7cd136811bad4e11720ee71054c97d225848dd4
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review quic_haric-quicinc-com/mac80211-Add-support-to-track-mesh-peer-beacon-miss-event/20220530-145016
git checkout e7cd136811bad4e11720ee71054c97d225848dd4
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=h8300 SHELL=/bin/bash net/mac80211/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <[email protected]>


sparse warnings: (new ones prefixed by >>)
>> net/mac80211/mesh_plink.c:626:31: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [usertype] beacon_int @@ got restricted __le16 [usertype] beacon_int @@
net/mac80211/mesh_plink.c:626:31: sparse: expected unsigned int [usertype] beacon_int
net/mac80211/mesh_plink.c:626:31: sparse: got restricted __le16 [usertype] beacon_int

vim +626 net/mac80211/mesh_plink.c

595
596 /*
597 * mesh_bmiss_update - update beacon miss parameters such as
598 * beacon count, beacon interval and timeout of beacon miss
599 * timer
600 *
601 * @sdata: local meshif
602 * @mgmt: mgmt frame info
603 * @elems: IEs from beacon or mesh peering frame.
604 * @rx_status: rx status for the frame for signal reporting
605 *
606 */
607
608 void mesh_bmiss_update(struct ieee80211_sub_if_data *sdata,
609 struct ieee80211_mgmt *mgmt,
610 struct ieee802_11_elems *elems,
611 struct ieee80211_rx_status *rx_status)
612 {
613 struct sta_info *sta;
614 u32 timeout;
615
616 /* mesh_sta_info_get api returns with rcu_read_lock */
617 sta = mesh_sta_info_get(sdata, mgmt->sa, elems, rx_status);
618 if (!sta)
619 goto unlock_rcu;
620
621 if (!(sta->local->hw.dbg_mask & IEEE80211_HW_DBG_BMISS_LOG) ||
622 !sta->sdata->vif.bmiss_threshold)
623 goto unlock_rcu;
624
625 sta->mesh->bmiss_count = 0;
> 626 sta->mesh->beacon_int = mgmt->u.beacon.beacon_int;
627 timeout = sta->mesh->beacon_int * sta->sdata->vif.bmiss_threshold;
628
629 mod_timer(&sta->mesh->bmiss_timer, (jiffies + msecs_to_jiffies(timeout)));
630
631 unlock_rcu:
632 rcu_read_unlock();
633 }
634

--
0-DAY CI Kernel Test Service
https://01.org/lkp