mac80211: add vht cap decode to debugfs

This makes it a lot easier to understand the capabilities used
by the station:

VHT supported
cap: 0x300819b2
		MAX-MPDU-11454
		80Mhz
		RXLDPC
		SHORT-GI-80
		TXSTBC
		RXSTBC_1
		SU-BEAMFORMER-CAPABLE
		SU-BEAMFORMEE-CAPABLE
		BEAMFORMEE-STS: 0x0
		SOUNDING-DIMENSIONS: 0x0
		MU-BEAMFORMER-CAPABLE
		MPDU-LENGTH-EXPONENT: 0x0
		LINK-ADAPTATION-VHT-MRQ-MFB: 0x0
		RX-ANTENNA-PATTERN
		TX-ANTENNA-PATTERN
RX MCS: fffe
TX MCS: fffe

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 76 insertions, 2 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 33dfcbc2bf9c..fd334133ff45 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -328,14 +328,88 @@ STA_OPS(ht_capa);
 static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
                                  size_t count, loff_t *ppos)
 {
-        char buf[128], *p = buf;
+        char buf[512], *p = buf;
         struct sta_info *sta = file->private_data;
         struct ieee80211_sta_vht_cap *vhtc = &sta->sta.vht_cap;
 
         p += scnprintf(p, sizeof(buf) + buf - p, "VHT %ssupported\n",
                         vhtc->vht_supported ? "" : "not ");
         if (vhtc->vht_supported) {
-                p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.8x\n", vhtc->cap);
+                p += scnprintf(p, sizeof(buf) + buf - p, "cap: %#.8x\n",
+                               vhtc->cap);
+#define PFLAG(a, b)                                                     \
+                do {                                                    \
+                        if (vhtc->cap & IEEE80211_VHT_CAP_ ## a)        \
+                                p += scnprintf(p, sizeof(buf) + buf - p, \
+                                               "\t\t%s\n", b);          \
+                } while (0)
+
+                switch (vhtc->cap & 0x3) {
+                case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\tMAX-MPDU-3895\n");
+                        break;
+                case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\tMAX-MPDU-7991\n");
+                        break;
+                case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\tMAX-MPDU-11454\n");
+                        break;
+                default:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\tMAX-MPDU-UNKNOWN\n");
+                };
+                switch (vhtc->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
+                case 0:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\t80Mhz\n");
+                        break;
+                case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\t160Mhz\n");
+                        break;
+                case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\t80+80Mhz\n");
+                        break;
+                default:
+                        p += scnprintf(p, sizeof(buf) + buf - p,
+                                       "\t\tUNKNOWN-MHZ: 0x%x\n",
+                                       (vhtc->cap >> 2) & 0x3);
+                };
+                PFLAG(RXLDPC, "RXLDPC");
+                PFLAG(SHORT_GI_80, "SHORT-GI-80");
+                PFLAG(SHORT_GI_160, "SHORT-GI-160");
+                PFLAG(TXSTBC, "TXSTBC");
+                p += scnprintf(p, sizeof(buf) + buf - p,
+                               "\t\tRXSTBC_%d\n", (vhtc->cap >> 8) & 0x7);
+                PFLAG(SU_BEAMFORMER_CAPABLE, "SU-BEAMFORMER-CAPABLE");
+                PFLAG(SU_BEAMFORMEE_CAPABLE, "SU-BEAMFORMEE-CAPABLE");
+                p += scnprintf(p, sizeof(buf) + buf - p,
+                        "\t\tBEAMFORMEE-STS: 0x%x\n",
+                        (vhtc->cap & IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK) >>
+                        IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+                p += scnprintf(p, sizeof(buf) + buf - p,
+                        "\t\tSOUNDING-DIMENSIONS: 0x%x\n",
+                        (vhtc->cap & IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK)
+                        >> IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_SHIFT);
+                PFLAG(MU_BEAMFORMER_CAPABLE, "MU-BEAMFORMER-CAPABLE");
+                PFLAG(MU_BEAMFORMEE_CAPABLE, "MU-BEAMFORMEE-CAPABLE");
+                PFLAG(VHT_TXOP_PS, "TXOP-PS");
+                PFLAG(HTC_VHT, "HTC-VHT");
+                p += scnprintf(p, sizeof(buf) + buf - p,
+                        "\t\tMPDU-LENGTH-EXPONENT: 0x%x\n",
+                        (vhtc->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK) >>
+                        IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT);
+                PFLAG(VHT_LINK_ADAPTATION_VHT_UNSOL_MFB,
+                      "LINK-ADAPTATION-VHT-UNSOL-MFB");
+                p += scnprintf(p, sizeof(buf) + buf - p,
+                        "\t\tLINK-ADAPTATION-VHT-MRQ-MFB: 0x%x\n",
+                        (vhtc->cap & IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB) >> 26);
+                PFLAG(RX_ANTENNA_PATTERN, "RX-ANTENNA-PATTERN");
+                PFLAG(TX_ANTENNA_PATTERN, "TX-ANTENNA-PATTERN");
 
                 p += scnprintf(p, sizeof(buf)+buf-p, "RX MCS: %.4x\n",
                                le16_to_cpu(vhtc->vht_mcs.rx_mcs_map));