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=-0.8 required=3.0 tests=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 D52CCC433DF for ; Mon, 25 May 2020 09:23:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFFEF20787 for ; Mon, 25 May 2020 09:23:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389499AbgEYJX6 (ORCPT ); Mon, 25 May 2020 05:23:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389105AbgEYJX6 (ORCPT ); Mon, 25 May 2020 05:23:58 -0400 Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:191:4433::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CD8FAC061A0E for ; Mon, 25 May 2020 02:23:57 -0700 (PDT) Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.93) (envelope-from ) id 1jd9Ku-002beb-3o; Mon, 25 May 2020 11:23:56 +0200 Message-ID: Subject: Re: iwlwifi: 8265: unexpected LLC packets TX'ed in monitor mode From: Johannes Berg To: Marco Fonseca , linux-wireless@vger.kernel.org Date: Mon, 25 May 2020 11:23:55 +0200 In-Reply-To: <20200513174827.3o7odouinuirou62@192.168.1.10> (sfid-20200513_195606_809894_A3639A1D) References: <20200513174827.3o7odouinuirou62@192.168.1.10> (sfid-20200513_195606_809894_A3639A1D) Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.36.2 (3.36.2-1.fc32) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On Wed, 2020-05-13 at 13:48 -0400, Marco Fonseca wrote: > Hello, > > While in monitor mode, the 8265 will periodically transmit gratuitous > LLC packets. In this mode, I would expect the wifi chipset to not > transmit any packets at all (unless packet injection is being used). > > This behavior can be observed by a second wifi device in monitor mode. > A display filter on wireshark/tshark of 'llc' makes these easy to spot. > > It seems these packets only get produced in presence of a few APs > and/or STAs but I'm not sure of the exact cause. I don't see the LLC > packets on very quiet channels. I think these are somehow related to calibrations in the device. johannes