mac80211: mlme: add documentation from spec to code

Reference the spec why we decline HE support in
case STA don't support all HE basic rates recurred by AP.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220202104617.f1bafd0861b7.I566612d99bca5245dc06cbcc70369b94a525389c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 291226a..bf77794 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -5052,7 +5052,15 @@ ieee80211_verify_sta_he_mcs_support(struct ieee80211_sub_if_data *sdata,
 
                        /*
                         * Make sure the HE AP doesn't require MCSs that aren't
-                        * supported by the client
+                        * supported by the client as required by spec
+                        *
+                        * P802.11-REVme/D0.3
+                        * 26.17.1 Basic HE BSS operation
+                        *
+                        * An HE STA shall not attempt to join * (MLME-JOIN.request primitive)
+                        * a BSS, unless it supports (i.e., is able to both transmit and
+                        * receive using) all of the <HE-MCS, NSS> tuples in the basic
+                        * HE-MCS and NSS set.
                         */
                        if (sta_rx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||
                            sta_tx_val == IEEE80211_HE_MCS_NOT_SUPPORTED ||