From: Sidhanta Sahu <[email protected]> Per IEEE P802.11bn/D2.0, Aug 2026, subclause 37.16, an AP MLD can be managed by a Seamless Mobility Domain Management Entity (SMD-ME) along with partner AP MLDs to enable seamless transition of an associated non-AP MLD from the current AP MLD to a target AP MLD. A non-AP MLD advertising SMD supports association to an SMD-ME and SMD BSS Transition between AP MLDs within an SMD.
Subclause 37.16.11 defines an optional capability for the current AP MLD to forward buffered downlink (DL) data frames for the non-AP MLD to the target AP MLD. Userspace needs a way to be aware of the driver's SMD capabilities so that it can enable SMD configuration and operation only on capable devices. Define two extended feature flags - NL80211_EXT_FEATURE_SMD for SMD management and BSS Transition capability - NL80211_EXT_FEATURE_SMD_DL_PKT_FORWARDING for DL data forwarding capability so that userspace can gate SMD setup and data forwarding configuration on driver support. Signed-off-by: Sidhanta Sahu <[email protected]> Signed-off-by: Pooventhiran G <[email protected]> --- include/uapi/linux/nl80211.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h index 9a2ccb8d66b8..d05103889912 100644 --- a/include/uapi/linux/nl80211.h +++ b/include/uapi/linux/nl80211.h @@ -7126,6 +7126,15 @@ enum nl80211_feature_flags { * offload in station mode, including Fast Transition or Opportunistic * Key Caching. * + * @NL80211_EXT_FEATURE_SMD: Driver supports Seamless Mobility Domain (SMD) + * and is managed by an SMD-ME to support SMD BSS Transition in AP mode + * and supports association to an SMD-ME and SMD BSS transition in + * non-AP STA mode. + * + * @NL80211_EXT_FEATURE_SMD_DL_PKT_FORWARDING: Driver supports forwarding of + * buffered downlink (DL) data packets in AP mode to the non-AP STA during + * SMD BSS Transition. + * * @NUM_NL80211_EXT_FEATURES: number of extended features. * @MAX_NL80211_EXT_FEATURES: highest extended feature index. */ @@ -7209,6 +7218,8 @@ enum nl80211_ext_feature_index { NL80211_EXT_FEATURE_SET_KEY_LTF_SEED, NL80211_EXT_FEATURE_PROBE_AP, NL80211_EXT_FEATURE_FAST_ROAM_OFFLOAD, + NL80211_EXT_FEATURE_SMD, + NL80211_EXT_FEATURE_SMD_DL_PKT_FORWARDING, /* add new features before the definition below */ NUM_NL80211_EXT_FEATURES, -- 2.34.1
