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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b0e4b3cf54sm321685a91.2.2026.11.05.23.59.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 23:59:55 -0800 (PST) From: Pooventhiran G Date: Fri, 06 Nov 2026 13:28:50 +0530 Subject: [PATCH wireless-next v4 13/21] wifi: mac80211: apply SMD BSS Transition STA sub-states X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261106-smd-v4-13-62e39487f51a@oss.qualcomm.com> References: <20261106-smd-v4-0-62e39487f51a@oss.qualcomm.com> In-Reply-To: <20261106-smd-v4-0-62e39487f51a@oss.qualcomm.com> To: Johannes Berg Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, pooventhiran.g@oss.qualcomm.com X-Mailer: b4 0.14.3 X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA2MDAzMSBTYWx0ZWRfX1TksO1ZnLC6r yQL5nBFZ23lijUvPDFoPY/08OPEq/xJPSfIL9PE0yweoUXDcZi7sFZMxSsXkSJ1n6LNYDe130UH xKmazGV6ocnvRatXEHdY3dTtaVTwbMw= X-Proofpoint-GUID: TWxVpjq6whoX1njU_fklAnpVle7hgy2p X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA2MDAzMSBTYWx0ZWRfXzN/8Y3fJwoVT YTckGAG9ZHEohDMF4KFJUN56dws0Htyw3L3O5MoXyW4R49mlp+qehUkz7XQAx5Ir0pJYpErOrqo rQUvHT7fGqYzTHRaIkii90tVY93N0/xRP9ZLhxoFvvn6BKuIDF0xqZd335oja+tlq1v0gWhHKxI e+rRc/tsoewWGgHiMhNSIniDOlndmfYxIUZ/EHDiqebRaQ4V9dBpzmh2ThAOUN1LD3BGbFdjYJv FBdJQRcRvjOWEqOTC7N/59NxWokRHRV7MfrQtpNaZ43Lvmfo93DnsBigK9wWm8v1cel4hgd1Cs1 6nExe6LlZ/nPmrhaxZO0Ds47FM+1R+GCwsGU8LPbWfBIe1ObuF6w2JAte5nRqFMjhsA2n1sm9Kz Dv3L6cichUXSt/37+qqoCSFghbmW+tgkItjmcUXpsmoEgihbsiJ534Anfwi2moxH6Ug0j+zVVtW ht5aq9L58Ml5KcDEk6A== X-Proofpoint-ORIG-GUID: TWxVpjq6whoX1njU_fklAnpVle7hgy2p X-Authority-Analysis: v=2.4 cv=ZIZCCn7b c=1 sm=1 tr=0 ts=6aed88fd cx=c_pps a=RP+M6JBNLl+fLTcSJhASfg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=eoimf2acIAo5FJnRuUoq:22 a=EUspDBNiAAAA:8 a=S5cDeCcwn0inUhub9TMA:9 a=QEXdDO2ut3YA:10 a=iS9zxrgQBfv6-_F4QbHw:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-06_02,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 bulkscore=0 impostorscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611060031 During SMD BSS Transition, the non-AP STA MLD roaming from the current AP MLD to the target AP MLD switches its new SMD sub-states. Capture these state transitions to track the station roaming. These are transient sub-states of WLAN_STA_AUTHORIZED with the SMD-ME. The station remains authenticated, associated, and RSNA-established throughout. At most one of the three may be set at a time; mutual exclusion is enforced in sta_apply_smd_state_flags(). Signed-off-by: Pooventhiran G --- net/mac80211/cfg.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++ net/mac80211/debugfs_sta.c | 3 +++ net/mac80211/sta_info.h | 8 +++++++ 3 files changed, 71 insertions(+) diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 37329d8748ae..1e0ef74a7420 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -2704,6 +2704,55 @@ static int sta_link_apply_parameters(struct ieee80211_local *local, return 0; } +static int sta_apply_smd_state_flags(struct sta_info *sta, + u32 mask, u32 set) +{ + bool smd_prep_target, smd_exec_current, smd_dl_drain; + u32 expected_mask = BIT(NL80211_STA_FLAG_SMD_PREP_TARGET) | + BIT(NL80211_STA_FLAG_SMD_EXEC_CURRENT) | + BIT(NL80211_STA_FLAG_SMD_DL_DRAIN); + u32 smd_flags; + + if (!(mask & expected_mask)) + return 0; + + smd_flags = mask & expected_mask & set; + if (WARN_ON(hweight32(smd_flags) > 1)) + return -EINVAL; + + smd_prep_target = + !!(smd_flags & BIT(NL80211_STA_FLAG_SMD_PREP_TARGET)); + smd_exec_current = + !!(smd_flags & BIT(NL80211_STA_FLAG_SMD_EXEC_CURRENT)); + smd_dl_drain = + !!(smd_flags & BIT(NL80211_STA_FLAG_SMD_DL_DRAIN)); + + if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) && + (smd_exec_current || smd_dl_drain)) + return -EINVAL; + + if (smd_prep_target) { + clear_sta_flag(sta, WLAN_STA_SMD_EXEC_CURRENT); + clear_sta_flag(sta, WLAN_STA_SMD_DL_DRAIN); + set_sta_flag(sta, WLAN_STA_SMD_PREP_TARGET); + } else if (smd_exec_current) { + clear_sta_flag(sta, WLAN_STA_SMD_PREP_TARGET); + clear_sta_flag(sta, WLAN_STA_SMD_DL_DRAIN); + set_sta_flag(sta, WLAN_STA_SMD_EXEC_CURRENT); + } else if (smd_dl_drain) { + clear_sta_flag(sta, WLAN_STA_SMD_PREP_TARGET); + clear_sta_flag(sta, WLAN_STA_SMD_EXEC_CURRENT); + set_sta_flag(sta, WLAN_STA_SMD_DL_DRAIN); + } else { + /* all flags revert back to none being set */ + clear_sta_flag(sta, WLAN_STA_SMD_PREP_TARGET); + clear_sta_flag(sta, WLAN_STA_SMD_EXEC_CURRENT); + clear_sta_flag(sta, WLAN_STA_SMD_DL_DRAIN); + } + + return 0; +} + static int sta_apply_parameters(struct ieee80211_local *local, struct sta_info *sta, struct station_parameters *params) @@ -2790,6 +2839,17 @@ static int sta_apply_parameters(struct ieee80211_local *local, if (params->smd_params.smd_sta) sta->sta.smd_params = params->smd_params; + /* + * SMD BSS Transition sub-states (IEEE P802.11bn/D2.0, Aug 2026, + * subclause 11.3.1). + * Only meaningful for SMD-capable stations (WLAN_STA_SMD set). + */ + if (test_sta_flag(sta, WLAN_STA_SMD)) { + ret = sta_apply_smd_state_flags(sta, mask, set); + if (ret) + return ret; + } + /* mark TDLS channel switch support, if the AP allows it */ if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) && !sdata->deflink.u.mgd.tdls_chan_switch_prohibited && diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index c2268f79601b..8071ca4c5f06 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -79,6 +79,9 @@ static const char * const sta_flag_names[] = { FLAG(USES_ENCRYPTION), FLAG(DECAP_OFFLOAD), FLAG(SMD), + FLAG(SMD_PREP_TARGET), + FLAG(SMD_EXEC_CURRENT), + FLAG(SMD_DL_DRAIN), #undef FLAG }; diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index 54c4c613a2da..2e9bb2ab567f 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -73,6 +73,11 @@ * so drop all packets without a key later. * @WLAN_STA_DECAP_OFFLOAD: This station uses rx decap offload * @WLAN_STA_SMD: this station is associated to an SMD-ME. + * @WLAN_STA_SMD_PREP_TARGET: this SMD station is prepared at the target AP MLD. + * @WLAN_STA_SMD_EXEC_CURRENT: this SMD station has started execution at + * the current AP MLD. + * @WLAN_STA_SMD_DL_DRAIN: this SMD station has started draining at + * the current AP MLD. * * @NUM_WLAN_STA_FLAGS: number of defined flags */ @@ -106,6 +111,9 @@ enum ieee80211_sta_info_flags { WLAN_STA_USES_ENCRYPTION, WLAN_STA_DECAP_OFFLOAD, WLAN_STA_SMD, + WLAN_STA_SMD_PREP_TARGET, + WLAN_STA_SMD_EXEC_CURRENT, + WLAN_STA_SMD_DL_DRAIN, NUM_WLAN_STA_FLAGS, }; -- 2.34.1