[PATCH] mac80211: add per-station HT capability file

Johannes Berg
2009-11-19T14:27:44Z

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>
---
net/mac80211/debugfs_sta.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)

--- wireless-testing.orig/net/mac80211/debugfs_sta.c 2009-11-19 01:05:45.000000000 +0100
+++ wireless-testing/net/mac80211/debugfs_sta.c 2009-11-19 01:27:32.000000000 +0100
@@ -157,6 +157,34 @@ static ssize_t sta_agg_status_read(struc
}
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 st
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)