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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3339af25062sm47841297eec.16.2026.09.07.13.34.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Sep 2026 13:34:22 -0700 (PDT) From: Pooventhiran G Date: Tue, 08 Sep 2026 01:59:27 +0530 Subject: [PATCH wireless-next 18/18] wifi: mac80211: Add mac80211 support to handle NL80211_CMD_GET_SMD_CTX Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260908-smd-v1-18-65ad4ab30fbd@oss.qualcomm.com> References: <20260908-smd-v1-0-65ad4ab30fbd@oss.qualcomm.com> In-Reply-To: <20260908-smd-v1-0-65ad4ab30fbd@oss.qualcomm.com> To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Johannes Berg Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Pooventhiran G X-Mailer: b4 0.14.3 X-Proofpoint-ORIG-GUID: _EGUofcb0kAkq5p7jpQDTE5Wf9CZp1Ly X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA3MDIyNiBTYWx0ZWRfXxZNRL6/N0CAs G+NjZR4PRK1TTiDVIej+uR7EVOEQSVF3exTq9R+Umd85HG7LhTBYBvdosuDRj89x2oBtyocDheQ t0Q1PXOeeUlSzmk6LDjkfcBE84v2rAKQP3vgMPFeNZCssxkVrvEISXkmuEZwKl1JQqXQM+eWRG3 82RW83cgivVO4kILLi5BiUgKbmckoOSWcQt6GH0Sf1r5Hv8YfJhcAvbF6/poZiQauN2d0TRikaP 9171yk4SzagBU8UQibo+gjA+g8ji7Tp68Zb1o7KXPK32T0VeJx2IlrVUJlnlZVdp87IrX62HqFa D80a+lyOgTspGrC0NGRjQh1kLBmt+05XqRjpPRiwjamJa4A9TKMNAq125JptgklBksub1zcnHA0 uDUm3F7+o2yLsCNn7A42STIFyxCwAn+s4/KyY7PJVHRRMTVSVHsHVz9ou/7m4NXV4vSkyhARGYR KfP9cyu1cVD+p0lmk4Q== X-Proofpoint-GUID: _EGUofcb0kAkq5p7jpQDTE5Wf9CZp1Ly X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA3MDIyNiBTYWx0ZWRfX1okd1KrF3RXh KF7Yy/FNU+hwDrALeK88k7k4A7yz+2qlgAxNlQrxWrBuSzOOPgjsFcIL6bSDnTmgswqzDbBez56 cCflZaxLuWNHBye5n+uazVR1DNV/msg= X-Authority-Analysis: v=2.4 cv=AduB2XXG c=1 sm=1 tr=0 ts=6a9f1fd0 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=c93CP5vvwBK-QZUl55wA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-07_05,2026-09-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 adultscore=0 phishscore=0 clxscore=1015 suspectscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609070226 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. Implement the get_smd_ctx cfg80211_op in mac80211 to invoke the driver to collect the requested station context. Because context collection is asynchronous, the driver signals completion later via ieee80211_get_smd_ctx_done(), which packs the collected 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 | 23 +++++++++++++++++++++++ net/mac80211/cfg.c | 34 ++++++++++++++++++++++++++++++++++ net/mac80211/driver-ops.h | 24 ++++++++++++++++++++++++ net/mac80211/sta_info.c | 6 ++++++ net/mac80211/trace.h | 27 +++++++++++++++++++++++++++ 5 files changed, 114 insertions(+) diff --git a/include/net/mac80211.h b/include/net/mac80211.h index e0e13f0ed31f..f16112e41594 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -2528,6 +2528,21 @@ enum ieee80211_sta_state { IEEE80211_STA_AUTHORIZED, }; +/** + * 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 (@st_info or @st_info->ctx may be NULL to + * indicate failure). @st_info is owned by the driver. + * + * Called by the driver after the %NL80211_CMD_GET_SMD_CTX context collection + * is complete. mac80211 forwards the result to cfg80211 which finds the pending + * nl80211 request and sends reply to userspace. + */ +void ieee80211_get_smd_ctx_done(struct ieee80211_vif *vif, + const u8 *sta_addr, + struct cfg80211_smd_transition_info *st_info); + /** * enum ieee80211_sta_rx_bandwidth - station RX bandwidth * @IEEE80211_STA_RX_BW_20: station can only receive 20 MHz @@ -4782,6 +4797,11 @@ 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, @@ -5191,6 +5211,9 @@ 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); }; /** diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 268d5f42293a..a33ce96a4752 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -6104,6 +6104,39 @@ 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 || !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, @@ -6223,4 +6256,5 @@ const struct cfg80211_ops mac80211_config_ops = { .nan_set_local_sched = ieee80211_set_local_nan_sched, .nan_set_peer_sched = ieee80211_set_peer_nan_sched, .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 e764dd394de2..0339ff71cd4a 100644 --- a/net/mac80211/driver-ops.h +++ b/net/mac80211/driver-ops.h @@ -1844,4 +1844,28 @@ 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 5aa6f5b481e3..9ea0a8791289 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 7aba79e441cf..38ad5076232d 100644 --- a/net/mac80211/trace.h +++ b/net/mac80211/trace.h @@ -3487,6 +3487,33 @@ 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