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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2e604a59a31sm8911615ad.81.2026.10.07.05.09.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 07 Oct 2026 05:09:05 -0700 (PDT) Message-ID: Date: Wed, 7 Oct 2026 17:39:02 +0530 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH wireless-next v2 00/16] wifi: Add Seamless Mobility Domain (SMD) AP support To: Johannes Berg Cc: linux-wireless@vger.kernel.org References: <20260924-smd-v2-0-bb40094da1d4@oss.qualcomm.com> <3d6e053b4f9c4f3cb91a2ea91a0c3abfa7c7025f.camel@sipsolutions.net> Content-Language: en-US From: Pooventhiran G In-Reply-To: <3d6e053b4f9c4f3cb91a2ea91a0c3abfa7c7025f.camel@sipsolutions.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Info: AW1haW4tMjYxMDA3MDA0OCBTYWx0ZWRfX0shifOseE875 yEDYQYnMnwsYN7t3R72dpyweW8D2sdzcaG5KaCQ+Dnta1C74LhS3ku01X12JJpOczBVCDCRrB1W H/ZQNSTwQcSPgLJlK8PdvD3cCauNOo8= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDA3MDA0OCBTYWx0ZWRfXw9//2vP8grDm Buvy1CG3XgkmLRY5+ZkCPGyJE6h0Y4YCIYDFiqh4t8Vu8Ytzhi7OI0Jna1vDyNpU1JNeuauMPSi qGJ5l788rvplft83iPOMstEQeB65xqMLEtZkBAN33/Ji1kcT4iIS8sJM+jV0G+Jmt3qXTmHr+GQ 4XiQ1X8Vx49zvltunqlQdj8ADtbbFn0uyNEwXFlR9iGNMy0tKpGx8RXfh84A2m/n7CMOBsHa0r8 JKgrcsF8cOQDnVaCfMr8ow5ziBc8er8uX8Pcw9am5chqf9i66gSuiuCsQRTlL94islme8M3daki YJwqr3l5s2Sl4zAK1MAO5B7NT4ZFsBtG8MfNgEsKqrIYSMxoDaukEbbvYee2yKSAtLjPTE/0/hC +XTKrl+VPn4BK2gLcXCb/FP4nsGL25hlcfyI3Isp1HGKyx7lBfQTKAuG2ygbCzdlZPQCFbiUTGy UmirYoU3a9zr1btoSEQ== X-Proofpoint-ORIG-GUID: ZfX13s9YKfRkVo18X0lcK4KKhNvEjSLp X-Authority-Analysis: v=2.4 cv=T5EZ3PKQ c=1 sm=1 tr=0 ts=6ac63663 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=IkcTkHD0fZMA:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=YMgV9FUhrdKAYTUUvYB2:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=xZk0DLfG5lygWoUhd6AA:9 a=QEXdDO2ut3YA:10 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-GUID: ZfX13s9YKfRkVo18X0lcK4KKhNvEjSLp 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=2026-10-07_04,2026-10-06_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 clxscore=1015 bulkscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2610070048 On 10/04/2026 04:19 pm, Johannes Berg wrote: > On Thu, 2026-09-24 at 08:10 +0530, Pooventhiran G wrote: >> IEEE P802.11bn introduces the Seamless Mobility Domain (SMD) - a mobility >> domain uniquely identified by the SMD identifier MAC address - where >> a non-AP MLD that is associated to the SMD Management Entity (SMD-ME) can >> transition from its current AP MLD to a non-colocated target AP MLD >> without requiring reassociation via SMD BSS Transition (ST) procedure. >> >> This series implements the nl80211, cfg80211, and mac80211 support for >> SMD BSS Transition in AP mode. Along with a summary of the ST procedure, >> the design of this series and patch structure are presented below. > > OK I'm wondering ... more things: > > 1. How is this supposed to update the DS correctly? mac80211 normally > does this via cfg80211_send_layer2_update() and I don't think > you're changing that, but then it's the wrong place? > > 2. In the kernel here the state is the per-AP MLD state of the STA, > not the SMD-ME state, so 4a isn't _really_ "AUTHORIZED", is it? > Ties in with 1. though, I guess. > (combining #1 and #2) Yes, Johannes. 4a is not part of state-4 per se in this implementation. Patch 6/16 [https://lore.kernel.org/all/20260924-smd-v2-6-bb40094da1d4@oss.qualcomm.com/] sanitizes only substate-4b and 4c transitions in state-4. Because, we are not introducing a new entity to track SMD-ME states but rely on MLD states (subclause 11.3.1, Table 11-6a). During Preparation, on the target AP MLD, STA will move till just state-3 and then to substate-4a. On the current AP MLD: STA moves to: 1 -> 2-> 3 -> 4 -> 4b -> 4c (optionally) -> 1 On the target AP MLD: STA moves to: 1 -> 2 -> 3 -> 4a -> 4 When STA moves to state-4, L2 update is sent via the existing state transition handler. > 3. I commented a few minutes ago about handling of 4a in rx.c, but > now I'm beginning to think we also need to handle 4b/4c > explicitly. > Yes, I will add frame limitations for all 3 SMD states. > 4. Adding a station in 4a should have _something_ about powersave, at > the very least some documentation that it must be done by drivers > (and then perhaps also hwsim changes)? > I will add documentation that drivers should handle this powersave since this is specific to SMD. > > johannes