When debugging you want to be lazy and not have to parse
bits yourself so let mac80211 debugfs do the parsing for you.
This is what I get against my WRT610N:
root@tux:~# cat /sys/kernel/debug/ieee80211/phy0/stations/00\:22\:6b\:aa\:bb\:01/ht_capa
ht supported
cap: 0x000e
HT20/HT40
SM Power Save disabled
No RX STBC
Max AMSDU length: 7935 bytes
No DSSS/CCK HT40
ampdu factor/density: 2/6
MCS mask: ff ff 00 00 00 00 00 00 00 00
MCS rx highest: 0
MCS tx params: 0
Cc: johannes@xxxxxxxxxxxxxxxx
Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
---
net/mac80211/debugfs_sta.c | 48 +++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 47 insertions(+), 1 deletions(-)
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index ae6a919..ab3397a 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -160,7 +160,12 @@ 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;
+#define PRINT_HT_CAP(_cond, _str) \
+ do { \
+ if (_cond) \
+ p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
+ } while (0)
+ char buf[1024], *p = buf;
int i;
struct sta_info *sta = file->private_data;
struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
@@ -169,6 +174,47 @@ static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
htc->ht_supported ? "" : "not ");
if (htc->ht_supported) {
p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
+
+ PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDCP");
+ PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
+ PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
+
+ PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
+ PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
+ PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
+
+ PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
+ PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
+ PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
+ PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
+
+ PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
+ PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
+ PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
+ PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
+
+ PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
+
+ PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
+ "3839 bytes");
+ PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
+ "7935 bytes");
+
+ /*
+ * For beacons and probe response this would mean the BSS
+ * does or does not allow the usage of DSSS/CCK HT40.
+ * Otherwise it means the STA does or does not use
+ * DSSS/CCK HT40.
+ */
+ PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
+ PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
+
+ /* BIT(13) is reserved */
+
+ PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
+
+ PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
+
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:");
--
1.6.3.3
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