From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6701BC433F5 for ; Sat, 4 Sep 2021 18:31:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 501CB60F9C for ; Sat, 4 Sep 2021 18:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237569AbhIDScA (ORCPT ); Sat, 4 Sep 2021 14:32:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44792 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237485AbhIDSby (ORCPT ); Sat, 4 Sep 2021 14:31:54 -0400 X-Greylist: delayed 585 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sat, 04 Sep 2021 11:30:52 PDT Received: from smtp.dkm.cz (smtp.dkm.cz [IPv6:2a02:8301:0:11::39]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A57CC0617AD for ; Sat, 4 Sep 2021 11:30:52 -0700 (PDT) Received: from smtp.dkm.cz (localhost [127.0.0.1]) by smtp.dkm.cz (Postfix) with ESMTP id 712B32EC81; Sat, 4 Sep 2021 20:20:58 +0200 (CEST) Received: from router.bayer.uni.cx (ip-89-103-167-90.net.upcbroadband.cz [89.103.167.90]) by smtp.dkm.cz (Postfix) with ESMTP; Sat, 4 Sep 2021 20:20:58 +0200 (CEST) Received: from album.bayer.uni.cx (album.bayer.uni.cx [IPv6:2001:470:993c:1:5246:5dff:fe8e:a186]) by router.bayer.uni.cx (Postfix) with SMTP id 29D96A0DC3; Sat, 4 Sep 2021 20:20:57 +0200 (CEST) Received: by album.bayer.uni.cx (sSMTP sendmail emulation); Sat, 04 Sep 2021 20:20:57 +0200 Date: Sat, 4 Sep 2021 20:20:57 +0200 From: Petr Pisar To: linux-wireless@vger.kernel.org Cc: Petr Pisar Subject: ath9 stopped transmitting multicast frames in Linux 5.14.0 Message-ID: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Qu/g+g4LZLshFBDJ" Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org --Qu/g+g4LZLshFBDJ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello, after upgrading Linux from 5.13.13 to 5.14.0 on my router with this wireless device: 03:00.0 Network controller [0280]: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:0030] (rev 01) Subsystem: Qualcomm Atheros AR93xx Wireless Network Adapter [168c:3116] Flags: bus master, fast devsel, latency 0, IRQ 18 Memory at 81200000 (64-bit, non-prefetchable) [size=128K] Expansion ROM at 81220000 [disabled] [size=64K] Capabilities: [40] Power Management version 3 Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+ Capabilities: [70] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Virtual Channel Capabilities: [300] Device Serial Number 00-00-00-00-00-00-00-00 Kernel driver in use: ath9k Kernel modules: ath9k which works as a WiFi accesspoint, I noticed that WiFi clients cannot use IPv6 anymore. The problem is that the router cannot translate an IPv6 address of the client to a MAC address. The reason is that IPv6 multicast packets used by ICMPv6 neighbour discovery protocol do not reach the clients. In other words the ath9k-driven device stopped transmitting multicast frames. This can be reproduced with "ndisc6 -r 100 fe80::217:c4ff:fe4e:1552 wlan0" command which queries (100 times) fe80::217:c4ff:fe4e:1552 address of my client from the router. tcpdump on the ath9k device shows the queries, but tcpdump on the client cannot see them. The other way works correctly. I observed this with all two WiFi clients I have (Pixel 3a phone, and a laptop with a Realtek chip). Upgrading to 5.14.1 did not help. Once I rebooted to 5.13.13, the functionality was restored. Therefore I conclude this is regression in 5.14.0 Linux. -- Petr --Qu/g+g4LZLshFBDJ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEE4/QvzhVoMKgDWObpT9GuwzZa978FAmEzuPwACgkQT9GuwzZa 979ZohAA4HM5dZV74vOfg5ILT5kJ2M4M64bYN7u/8XcuDGrKBkK/2vfTUI9knKnH aBvl7wRpAkNsDRPCiu65azUhEtJbZnFii7jLQz6l6R+i25g5Jlyia/ew9J4BTnx3 WWswQZCGRcE0/IIZ8Ego8xEmi2stii5+Qg/r3UkgdJbQzTFG3BsdYKlM7AXSOjom Oa9M5QVzfraWKK3c8+f03Z+1sEqwXiho/jbpF4K+g1MuDaGSCZC6EYMyYzdgRN5C 7H/2V4YQZKYEvV4xJlUkffE+VR8LiKr7e1KqHuL9/GSZRYicyERidZ4WpPKrxbq0 Zd9nFhBU3c58QUb2njBWaUF2TbZP4AlMtUezsePjD3eHO7hpXI1uoLL+NH6/qttv 9hOu2cW0aUWyPMW/bnjGkQXONsii8CdzVkBpIMgFWFlSyJ+RXcG4En36PmOBCqsm Ae9rMBSEWqIZqWd+O6O86J+NQy9SOTSIR8UhudzJG/wxdZhYF0HqOkjvbfNTvpfR 5njzUhKWrZgiRmmSwV1wXDyxUdSC1sBbEAF3eph6mQdnWQ7kWEXduAhojeYqpcoq Yf16kuZjk/+vDxG6nWpGLBHqdXr5TRfVqOao/LoVOK3KETbZCXcHxK+q5/u++rfy VRgjgrvq7wgJ2VoJwfPL2RFLTHH1KV5JikFqxXoMbtgMyEwLQEo= =9Wg2 -----END PGP SIGNATURE----- --Qu/g+g4LZLshFBDJ--