[PATCH 3/4] wifi: rtw89: advertise MLD TID-to-link mapping and link reconfiguration

[Louis Kotze]

Wi-Fi Alliance Certificate WFA129313 (RTL8922AE 802.11be and Bluetooth
combo module, 2024-05-23, FW 6102.24.109.0) certifies both "Advertised
TID-to-link mapping" and "Multi-link reconfiguration (AP removal/restart)"
as Wi-Fi 7 features for this chip. The driver currently sets
mld_capa_and_ops = 0, so the STA negotiates neither capability with the
AP.

Use FIELD_PREP_CONST() (already used elsewhere in this driver, see
usb.c:784-787) to set IEEE80211_MLD_CAP_OP_TID_TO_LINK_MAP_NEG_SUPP_SAME
in the TID-to-link-map-neg-supp field, plus
IEEE80211_MLD_CAP_OP_LINK_RECONF_SUPPORT. This matches the value used by
iwlwifi for its Wi-Fi 7 STA mode (see drivers/net/wireless/intel/iwlwifi/
mld/mac80211.c IWL_MLD_CAPA_OPS macro and mvm/mac80211.c
IWL_MVM_MLD_CAPA_OPS macro), which is the established in-tree precedent
for this exact bit pattern on a Wi-Fi 7 STA.

The IEEE80211_MLD_CAP_OP_MAX_SIMUL_LINKS field is left at 0 (= 1 max
simultaneous link, matching the EMLSR-only operating mode the driver
implements per enum rtw89_mlo_mode {MLSR, EMLSR}).

These two capabilities are orthogonal to MLO operating mode (EMLSR
remains the negotiated mode per the previous patch in this series); they
let the AP perform online TID-to-link reassignments and remove or restart
links without a full assoc cycle on the STA side.

Tested on RTL8922AU (USB variant, same MAC + RF as cert'd PCIe AE)
against TP-Link Deco BE63 mesh; assoc remains stable, no regression in
EMLSR multi-link assoc behavior, all 11 wifi-health-check probes pass.

Link: https://api.cert.wi-fi.org/api/certificate/download/public?variantId=129706 [WFA cert WFA129313]
Signed-off-by: Louis Kotze <loukot@xxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw89/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 986deb2c1384..aedb2a284cd4 100644
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -221,7 +221,10 @@ static const struct wiphy_iftype_ext_capab rtw89_iftypes_ext_capa[] = {
 			IEEE80211_EML_CAP_EMLSR_SUPP |
 			(IEEE80211_EML_CAP_EML_PADDING_DELAY_256US << 1) |
 			(IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY_32US << 4),
-		.mld_capa_and_ops = 0,
+		.mld_capa_and_ops =
+			FIELD_PREP_CONST(IEEE80211_MLD_CAP_OP_TID_TO_LINK_MAP_NEG_SUPP,
+					 IEEE80211_MLD_CAP_OP_TID_TO_LINK_MAP_NEG_SUPP_SAME) |
+			IEEE80211_MLD_CAP_OP_LINK_RECONF_SUPPORT,
 	},
 };
 
-- 
2.54.0