mac80211: add per-station HT capability file

This is sometimes useful to debug HT issues
as it shows what exactly the stack thinks
the peer supports.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index f043c29070d7..3f41608c8081 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -157,6 +157,34 @@ static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 }
 STA_OPS(agg_status);
 
+static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
+                                size_t count, loff_t *ppos)
+{
+        char buf[200], *p = buf;
+        int i;
+        struct sta_info *sta = file->private_data;
+        struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
+
+        p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
+                        htc->ht_supported ? "" : "not ");
+        if (htc->ht_supported) {
+                p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.2x\n", htc->cap);
+                p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
+                                htc->ampdu_factor, htc->ampdu_density);
+                p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
+                for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
+                        p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
+                                        htc->mcs.rx_mask[i]);
+                p += scnprintf(p, sizeof(buf)+buf-p, "\nMCS rx highest: %d\n",
+                                le16_to_cpu(htc->mcs.rx_highest));
+                p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
+                                htc->mcs.tx_params);
+        }
+
+        return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+STA_OPS(ht_capa);
+
 #define DEBUGFS_ADD(name) \
         debugfs_create_file(#name, 0400, \
                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
@@ -207,6 +235,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
         DEBUGFS_ADD(last_signal);
         DEBUGFS_ADD(last_noise);
         DEBUGFS_ADD(wep_weak_iv_count);
+        DEBUGFS_ADD(ht_capa);
 }
 
 void ieee80211_sta_debugfs_remove(struct sta_info *sta)