Return-path: Received: from mail-oi0-f51.google.com ([209.85.218.51]:36584 "EHLO mail-oi0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750990AbcEYH4a convert rfc822-to-8bit (ORCPT ); Wed, 25 May 2016 03:56:30 -0400 Received: by mail-oi0-f51.google.com with SMTP id j1so65967106oih.3 for ; Wed, 25 May 2016 00:56:29 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <590f02bf-63a1-9510-dddb-d903fe03284e@broadcom.com> References: <56F1A9E9.5090803@broadcom.com> <56F273AB.2060001@broadcom.com> <590f02bf-63a1-9510-dddb-d903fe03284e@broadcom.com> Date: Wed, 25 May 2016 09:56:29 +0200 Message-ID: (sfid-20160525_095657_905990_7A4A055C) Subject: Re: Problem with brcmfmac removing extra interface From: =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= To: Arend Van Spriel Cc: brcm80211 development , "linux-wireless@vger.kernel.org" , Brett Rudley , Arend van Spriel , "Franky (Zhenhui) Lin" , Hante Meuleman Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On 24 May 2016 at 21:49, Arend Van Spriel wrote: > Looking into the firmware code it turns out that the DOWN command brings > down the entire stack iso single interface. This seems specific for some > firmware branches so we have to find a better solution. Hante and I are > looking into it. I started working on brcmfmac few days ago and I realized that as well. When having 4 AP interfaces and stopping hostapd nicely I get: brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:3:BRCMF_E_IF_CHANGE brcmfmac: action: 3 ifidx: 0 bsscfgidx: 0 flags: 0 role: 8 brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:2:BRCMF_E_IF_DEL brcmfmac: action: 2 ifidx: 1 bsscfgidx: 2 flags: 0 role: 1 brcmfmac: brcmf_fweh_call_event_handler: no interface object brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:2:BRCMF_E_IF_DEL brcmfmac: action: 2 ifidx: 2 bsscfgidx: 3 flags: 0 role: 1 brcmfmac: brcmf_fweh_call_event_handler: no interface object brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:2:BRCMF_E_IF_DEL brcmfmac: action: 2 ifidx: 3 bsscfgidx: 4 flags: 0 role: 1 brcmfmac: brcmf_fweh_call_event_handler: no interface object brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:1:BRCMF_E_IF_ADD brcmfmac: action: 1 ifidx: 0 bsscfgidx: 0 flags: 0 role: 8 brcmfmac: adding wl0 (80:23:6a:a3:7d:95) brcmfmac: [brcmf_fweh_handle_if_event] ifevent->action:3:BRCMF_E_IF_CHANGE brcmfmac: action: 3 ifidx: 0 bsscfgidx: 0 flags: 0 role: 0 It means that all interfaces/BSS-es were dropped by firmware internally and thanks to that we can create them again (start AP again). It doesn't happen if: 1) I simply add & remove interfaces manually with "iw" 2) I use BCM4366 and hostapd In both above cases firmware keeps its internal interfaces/BSS-es and I can't recreate interfaces. -- Rafał