iwlwifi: mvm: add per-interface debugfs with mac_params file

Use the per-interface debugfs infrastructure to create a
directory and symlink, and add a file containing debug
data related to each virtual interface.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 110 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index b080b4ba5458..5cecb75241d1 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -300,6 +300,58 @@ static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
         return count;
 }
 
+static ssize_t iwl_dbgfs_mac_params_read(struct file *file,
+                                         char __user *user_buf,
+                                         size_t count, loff_t *ppos)
+{
+        struct ieee80211_vif *vif = file->private_data;
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        struct iwl_mvm *mvm = mvmvif->dbgfs_data;
+        u8 ap_sta_id;
+        struct ieee80211_chanctx_conf *chanctx_conf;
+        char buf[512];
+        int bufsz = sizeof(buf);
+        int pos = 0;
+        int i;
+
+        mutex_lock(&mvm->mutex);
+
+        ap_sta_id = mvmvif->ap_sta_id;
+
+        pos += scnprintf(buf+pos, bufsz-pos, "mac id/color: %d / %d\n",
+                         mvmvif->id, mvmvif->color);
+        pos += scnprintf(buf+pos, bufsz-pos, "bssid: %pM\n",
+                         vif->bss_conf.bssid);
+        pos += scnprintf(buf+pos, bufsz-pos, "QoS:\n");
+        for (i = 0; i < ARRAY_SIZE(mvmvif->queue_params); i++) {
+                pos += scnprintf(buf+pos, bufsz-pos,
+                                 "\t%d: txop:%d - cw_min:%d - cw_max = %d - aifs = %d upasd = %d\n",
+                                 i, mvmvif->queue_params[i].txop,
+                                 mvmvif->queue_params[i].cw_min,
+                                 mvmvif->queue_params[i].cw_max,
+                                 mvmvif->queue_params[i].aifs,
+                                 mvmvif->queue_params[i].uapsd);
+        }
+
+        if (vif->type == NL80211_IFTYPE_STATION)
+                pos += scnprintf(buf+pos, bufsz-pos, "ap_sta_id %d\n",
+                                 ap_sta_id);
+
+        rcu_read_lock();
+        chanctx_conf = rcu_dereference(vif->chanctx_conf);
+        if (chanctx_conf) {
+                pos += scnprintf(buf+pos, bufsz-pos,
+                                 "idle rx chains %d, active rx chains: %d\n",
+                                 chanctx_conf->rx_chains_static,
+                                 chanctx_conf->rx_chains_dynamic);
+        }
+        rcu_read_unlock();
+
+        mutex_unlock(&mvm->mutex);
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+}
+
 #define BT_MBOX_MSG(_notif, _num, _field)                                    \
         ((le32_to_cpu((_notif)->mbox_msg[(_num)]) & BT_MBOX##_num##_##_field)\
         >> BT_MBOX##_num##_##_field##_POS)
@@ -464,6 +516,9 @@ MVM_DEBUGFS_WRITE_FILE_OPS(power_down_allow);
 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_d3_allow);
 MVM_DEBUGFS_WRITE_FILE_OPS(fw_restart);
 
+/* Interface specific debugfs entries */
+MVM_DEBUGFS_READ_FILE_OPS(mac_params);
+
 int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 {
         char buf[100];
@@ -494,3 +549,58 @@ err:
         IWL_ERR(mvm, "Can't create the mvm debugfs directory\n");
         return -ENOMEM;
 }
+
+void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
+{
+        struct dentry *dbgfs_dir = vif->debugfs_dir;
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+        char buf[100];
+
+        if (!dbgfs_dir)
+                return;
+
+        mvmvif->dbgfs_dir = debugfs_create_dir("iwlmvm", dbgfs_dir);
+        mvmvif->dbgfs_data = mvm;
+
+        if (!mvmvif->dbgfs_dir) {
+                IWL_ERR(mvm, "Failed to create debugfs directory under %s\n",
+                        dbgfs_dir->d_name.name);
+                return;
+        }
+
+        MVM_DEBUGFS_ADD_FILE_VIF(mac_params, mvmvif->dbgfs_dir,
+                                 S_IRUSR);
+
+        /*
+         * Create symlink for convenience pointing to interface specific
+         * debugfs entries for the driver. For example, under
+         * /sys/kernel/debug/iwlwifi/0000\:02\:00.0/iwlmvm/
+         * find
+         * netdev:wlan0 -> ../../../ieee80211/phy0/netdev:wlan0/iwlmvm/
+         */
+        snprintf(buf, 100, "../../../%s/%s/%s/%s",
+                 dbgfs_dir->d_parent->d_parent->d_name.name,
+                 dbgfs_dir->d_parent->d_name.name,
+                 dbgfs_dir->d_name.name,
+                 mvmvif->dbgfs_dir->d_name.name);
+
+        mvmvif->dbgfs_slink = debugfs_create_symlink(dbgfs_dir->d_name.name,
+                                                     mvm->debugfs_dir, buf);
+        if (!mvmvif->dbgfs_slink)
+                IWL_ERR(mvm, "Can't create debugfs symbolic link under %s\n",
+                        dbgfs_dir->d_name.name);
+        return;
+err:
+        IWL_ERR(mvm, "Can't create debugfs entity\n");
+}
+
+void iwl_mvm_vif_dbgfs_clean(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
+{
+        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+        debugfs_remove(mvmvif->dbgfs_slink);
+        mvmvif->dbgfs_slink = NULL;
+
+        debugfs_remove_recursive(mvmvif->dbgfs_dir);
+        mvmvif->dbgfs_dir = NULL;
+}