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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36f72cc9b88sm357284eec.14.2026.11.05.11.41.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 11:41:05 -0800 (PST) From: Pooventhiran G Date: Fri, 06 Nov 2026 01:08:55 +0530 Subject: [PATCH wireless-next v3 20/21] wifi: mac80211: add mac80211 support to handle NL80211_CMD_GET_SMD_CTX 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-v3-20-1723950e3cf8@oss.qualcomm.com> References: <20261106-smd-v3-0-1723950e3cf8@oss.qualcomm.com> In-Reply-To: <20261106-smd-v3-0-1723950e3cf8@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-Details-Enc: AW1haW4tMjYxMTA1MDA3OCBTYWx0ZWRfX9bBim1V/PT8S CxPZawUvVCPLi9HZuXbhDrpxN7LNwkLFKdZf1TitqYSzdK+ZmfcFwBg7iDlJUaAoaXPHMiuJYbD NCfgtpO29zlZlLRCcqllP5TtfWEJ1uqc+P4iemZmWURsp/zQr3oS+ZDZjAIJPHVh0T6qRkpMUeQ P0aDKbOttn/ioPWI82MGiyLhqLX1gKLAWjiv8N75k2sfh7za7VE3lkwr9ghHLBABORLAv7ukiDt Mx0QcfhjRJwq/ul5H0pgF1D5477I5VO4NjTICedKKV6NbHkHUdPVVnFpn4RMabDcpXG4N8EqPKX RYuPvinXUxqE0Y966NrnyIRGwkZ9ErmL/Wbv/dm36eBuIgievhlgZz7I+8+GZKzo2ZN4dJ+dfgK z7FLk3qViUi5zADUl9XqF9MllrwGl9y8x8yNYr0fAhabuZT6UnFbCkTE80LdLz2NpzNPtsafmFL cCBtk9n4FxqJ0IHMUMg== X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA1MDA3OCBTYWx0ZWRfX8Efh3i8Cw5GA Uqwes9i4yzNNILER++JCAwZVsQTwmcSyTZjXYMUGN7mQ0yEFTGbxPdWFxqgWIWNOGIuMmaEBXZZ 5ew6M05KD5hxkK3lY5ckxfc0WK2r5NI= X-Proofpoint-ORIG-GUID: UpL_XjXpJwuwKi7KD15bpM9uT9kCoH6q X-Authority-Analysis: v=2.4 cv=a4+lZkSF c=1 sm=1 tr=0 ts=6aecdbd3 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=x9_SPualhOxJPIen774A:9 a=QEXdDO2ut3YA:10 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-GUID: UpL_XjXpJwuwKi7KD15bpM9uT9kCoH6q 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=2026-11-05_05,2026-11-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 spamscore=0 suspectscore=0 adultscore=0 clxscore=1015 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610300000 definitions=main-2611050078 cfg80211 supports NL80211_CMD_GET_SMD_CTX from userspace on the current AP MLD to collect the station's context on the target AP MLD's behalf; this context is used by the target AP MLD to program its TX and RX queues to support seamless roaming of the non-AP MLD. Add mac80211 support for the same to invoke the driver to collect the requested station context. Since context collection is asynchronous, the driver reports the collected context later via ieee80211_get_smd_ctx_done(), which then packs the context into NL80211_CMD_SMD_CTX_EVENT and delivers it to userspace as a multicast event. Signed-off-by: Pooventhiran G --- include/net/mac80211.h | 19 +++++++++++++++++++ net/mac80211/cfg.c | 36 ++++++++++++++++++++++++++++++++++++ net/mac80211/driver-ops.h | 24 ++++++++++++++++++++++++ net/mac80211/sta_info.c | 6 ++++++ net/mac80211/trace.h | 27 +++++++++++++++++++++++++++ 5 files changed, 112 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index 15d9a069ba73..d78b7e897230 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -4817,6 +4817,11 @@ enum ieee80211_sta_smd_state { * The callback can sleep. * @set_smd_ctx: Set the UHR SMD context for the non-AP MLD. This is used on * the target AP MLD side to program dynamic context. + * @get_smd_ctx: Get the UHR SMD context for the non-AP MLD. This is used in + * the current AP MLD side on behalf of the target AP MLD to collect + * dynamic context, when the non-AP MLD sends ST Execute frame directly + * to the target. Since the response is asynchronous, the drivers that + * implement this should not store reference to @sta. */ struct ieee80211_ops { void (*tx)(struct ieee80211_hw *hw, @@ -5238,6 +5243,9 @@ struct ieee80211_ops { int (*set_smd_ctx)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct ieee80211_sta *sta, struct cfg80211_smd_transition_info *st_info); + int (*get_smd_ctx)(struct ieee80211_hw *hw, struct ieee80211_vif *vif, + struct ieee80211_sta *sta, + enum nl80211_smd_ctx_type type); }; /** @@ -8312,4 +8320,15 @@ bool ieee80211_vif_nan_started(struct ieee80211_vif *vif); * Return: 0 if success and non-zero on error */ int ieee80211_encrypt_tx_skb(struct sk_buff *skb); + +/** + * ieee80211_get_smd_ctx_done - Deliver async get_smd_ctx result to nl80211 + * @vif: virtual interface + * @sta_addr: non-AP MLD address the context was collected for + * @st_info: SMD BSS Transition Info (set @st_info->ctx to NULL to indicate + * failure) + */ +void ieee80211_get_smd_ctx_done(struct ieee80211_vif *vif, + const u8 *sta_addr, + struct cfg80211_smd_transition_info *st_info); #endif /* MAC80211_H */ diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 356c14eaa58c..26ebbc27dac0 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -6388,6 +6388,41 @@ static int ieee80211_set_smd_ctx(struct wiphy *wiphy, struct wireless_dev *wdev, return drv_set_smd_ctx(local, sdata, &sta->sta, st_info); } +static int ieee80211_get_smd_ctx(struct wiphy *wiphy, struct wireless_dev *wdev, + const u8 *addr, + enum nl80211_smd_ctx_type type) +{ + struct ieee80211_local *local = wiphy_priv(wiphy); + struct ieee80211_sub_if_data *sdata; + struct sta_info *sta; + + lockdep_assert_wiphy(wiphy); + + sdata = IEEE80211_WDEV_TO_SUB_IF(wdev); + + if (sdata->vif.type != NL80211_IFTYPE_AP && + sdata->vif.type != NL80211_IFTYPE_AP_VLAN) + return -EOPNOTSUPP; + + sta = sta_info_get_bss(sdata, addr); + if (!sta) + return -ENOENT; + if (!sta->sta.smd_params.smd_sta) + return -EINVAL; + + return drv_get_smd_ctx(local, sdata, &sta->sta, type); +} + +void ieee80211_get_smd_ctx_done(struct ieee80211_vif *vif, + const u8 *sta_addr, + struct cfg80211_smd_transition_info *st_info) +{ + struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); + + cfg80211_get_smd_ctx_done(&sdata->wdev, sta_addr, st_info); +} +EXPORT_SYMBOL(ieee80211_get_smd_ctx_done); + const struct cfg80211_ops mac80211_config_ops = { .add_virtual_intf = ieee80211_add_iface, .del_virtual_intf = ieee80211_del_iface, @@ -6512,4 +6547,5 @@ const struct cfg80211_ops mac80211_config_ops = { .nan_set_peer_sched = ieee80211_set_peer_nan_sched, .nan_set_non_evac_channels = ieee80211_set_nan_non_evac_channels, .set_smd_ctx = ieee80211_set_smd_ctx, + .get_smd_ctx = ieee80211_get_smd_ctx, }; diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h index 530936ffa11a..7d23ac03a899 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -1835,4 +1835,28 @@ static inline int drv_set_smd_ctx(struct ieee80211_local *local, return ret; } +static inline int drv_get_smd_ctx(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + struct ieee80211_sta *sta, + enum nl80211_smd_ctx_type type) +{ + int ret; + + if (!sdata || !local->ops->get_smd_ctx) + return -EOPNOTSUPP; + + sdata = get_bss_sdata(sdata); + + lockdep_assert_wiphy(local->hw.wiphy); + + if (!check_sdata_in_driver(sdata)) + return -EIO; + + trace_drv_get_smd_ctx(local, sdata, sta, type); + ret = local->ops->get_smd_ctx(&local->hw, &sdata->vif, sta, type); + trace_drv_return_int(local, ret); + + return ret; +} + #endif /* __MAC80211_DRIVER_OPS */ diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index d4d1008887c9..a3e161d160f0 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -1312,6 +1312,7 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta) { struct ieee80211_local *local; struct ieee80211_sub_if_data *sdata; + struct wireless_dev *wdev; int ret, i; might_sleep(); @@ -1321,6 +1322,7 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta) local = sta->local; sdata = sta->sdata; + wdev = &sdata->wdev; lockdep_assert_wiphy(local->hw.wiphy); @@ -1390,6 +1392,10 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta) rcu_access_pointer(sdata->u.vlan.sta) == sta) RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); + if (sdata->vif.type == NL80211_IFTYPE_AP || + sdata->vif.type == NL80211_IFTYPE_AP_VLAN) + cfg80211_free_pending_smd_ctx_req(wdev, sta->addr); + return 0; } diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h index c156e28fa07b..cdfacbc6e891 100644 --- a/net/mac80211/trace.h +++ b/net/mac80211/trace.h @@ -3502,6 +3502,33 @@ TRACE_EVENT(drv_set_smd_ctx, ) ); +TRACE_EVENT(drv_get_smd_ctx, + TP_PROTO(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata, + struct ieee80211_sta *sta, + enum nl80211_smd_ctx_type type), + + TP_ARGS(local, sdata, sta, type), + + TP_STRUCT__entry( + LOCAL_ENTRY + VIF_ENTRY + STA_ENTRY + __field(u8, st_type) + ), + + TP_fast_assign( + LOCAL_ASSIGN; + VIF_ASSIGN; + STA_ASSIGN; + __entry->st_type = type; + ), + + TP_printk(LOCAL_PR_FMT VIF_PR_FMT STA_PR_FMT ", ST type=%u", + LOCAL_PR_ARG, VIF_PR_ARG, STA_PR_ARG, __entry->st_type + ) +); + #endif /* !__MAC80211_DRIVER_TRACE || TRACE_HEADER_MULTI_READ */ #undef TRACE_INCLUDE_PATH -- 2.34.1