wifi: iwlwifi: mld: add link and link station FW IDs to debugfs

Add the link and link station FW IDs to debugfs to aid debug
and testing, since assignments can't be known ahead of time,
especially with ID randomisation turned on.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20260515150751.7224fab5fe8d.Ic2fd82f5f20945aa070ac9e38882fcff2172a4d8@changeid
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
index afe972834cb875f49635490622760e8320831643..351a4f177e920f7e4b27f0213715e9ef70f79ad2 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mld/debugfs.c
@@ -983,12 +983,35 @@ void iwl_mld_add_vif_debugfs(struct ieee80211_hw *hw,
 #define LINK_DEBUGFS_WIPHY_WRITE_FILE_OPS(name, bufsz)                 \
        WIPHY_DEBUGFS_WRITE_FILE_OPS(link_##name, bufsz, bss_conf)
 
+/*
+ * Note: no locking is provided, so the function must have its own,
+ * but it cannot acquire the wiphy mutex.
+ */
+#define LINK_DEBUGFS_READ_FILE_OPS(name, bufsz)                        \
+       _MLD_DEBUGFS_READ_FILE_OPS(link_##name, bufsz, struct ieee80211_bss_conf)
+
 #define LINK_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode)         \
        debugfs_create_file(alias, mode, parent, link_conf,             \
                            &iwl_dbgfs_link_##name##_ops)
 #define LINK_DEBUGFS_ADD_FILE(name, parent, mode)                      \
        LINK_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)
 
+static ssize_t iwl_dbgfs_link_fw_id_read(struct ieee80211_bss_conf *link_conf,
+                                        size_t buflen, void *buf)
+{
+       struct iwl_mld_link *mld_link;
+
+       guard(rcu)();
+
+       mld_link = iwl_mld_link_from_mac80211(link_conf);
+       if (!mld_link)
+               return -EINVAL;
+
+       return scnprintf(buf, buflen, "%d\n", mld_link->fw_id);
+}
+
+LINK_DEBUGFS_READ_FILE_OPS(fw_id, 64);
+
 void iwl_mld_add_link_debugfs(struct ieee80211_hw *hw,
                              struct ieee80211_vif *vif,
                              struct ieee80211_bss_conf *link_conf,
@@ -1009,6 +1032,8 @@ void iwl_mld_add_link_debugfs(struct ieee80211_hw *hw,
                /* Release the reference from debugfs_lookup */
                dput(mld_link_dir);
        }
+
+       LINK_DEBUGFS_ADD_FILE(fw_id, mld_link_dir, 0400);
 }
 
 static ssize_t _iwl_dbgfs_fixed_rate_write(struct iwl_mld *mld, char *buf,
@@ -1092,6 +1117,21 @@ static ssize_t iwl_dbgfs_link_sta_tlc_dhc_write(struct iwl_mld *mld, char *buf,
        return ret ? : count;
 }
 
+static ssize_t
+iwl_dbgfs_link_sta_fw_id_read(struct ieee80211_link_sta *link_sta,
+                             size_t buflen, void *buf)
+{
+       struct iwl_mld_link_sta *mld_link_sta;
+
+       guard(rcu)();
+
+       mld_link_sta = iwl_mld_link_sta_from_mac80211(link_sta);
+       if (!mld_link_sta)
+               return -EINVAL;
+
+       return scnprintf(buf, buflen, "%u\n", mld_link_sta->fw_id);
+}
+
 #define LINK_STA_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode)     \
        debugfs_create_file(alias, mode, parent, link_sta,              \
                            &iwl_dbgfs_link_sta_##name##_ops)
@@ -1101,9 +1141,18 @@ static ssize_t iwl_dbgfs_link_sta_tlc_dhc_write(struct iwl_mld *mld, char *buf,
 #define LINK_STA_WIPHY_DEBUGFS_WRITE_OPS(name, bufsz)                  \
        WIPHY_DEBUGFS_WRITE_FILE_OPS(link_sta_##name, bufsz, link_sta)
 
+/*
+ * Note: no locking is provided, so the function must have its own,
+ * but it cannot acquire the wiphy mutex.
+ */
+#define LINK_STA_DEBUGFS_READ_OPS(name, bufsz)                         \
+       _MLD_DEBUGFS_READ_FILE_OPS(link_sta_##name, bufsz,              \
+                                  struct ieee80211_link_sta)
+
 LINK_STA_WIPHY_DEBUGFS_WRITE_OPS(tlc_dhc, 64);
 LINK_STA_WIPHY_DEBUGFS_WRITE_OPS(fixed_rate, 64);
 LINK_STA_WIPHY_DEBUGFS_WRITE_OPS(fixed_rate_v3, 64);
+LINK_STA_DEBUGFS_READ_OPS(fw_id, 64);
 
 void iwl_mld_add_link_sta_debugfs(struct ieee80211_hw *hw,
                                  struct ieee80211_vif *vif,
@@ -1113,4 +1162,5 @@ void iwl_mld_add_link_sta_debugfs(struct ieee80211_hw *hw,
        LINK_STA_DEBUGFS_ADD_FILE(fixed_rate, dir, 0200);
        LINK_STA_DEBUGFS_ADD_FILE(fixed_rate_v3, dir, 0200);
        LINK_STA_DEBUGFS_ADD_FILE(tlc_dhc, dir, 0200);
+       LINK_STA_DEBUGFS_ADD_FILE(fw_id, dir, 0400);
 }