From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail2.candelatech.com ([208.74.158.173]:34181 "EHLO mail2.candelatech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753892AbbDNO4S (ORCPT ); Tue, 14 Apr 2015 10:56:18 -0400 Message-ID: <552D2A90.1070307@candelatech.com> (sfid-20150414_165621_625089_B0372971) Date: Tue, 14 Apr 2015 07:56:16 -0700 From: Ben Greear MIME-Version: 1.0 To: Johannes Berg CC: linux-wireless@vger.kernel.org Subject: Re: [RFC] mac80211_hwsim: notify user-space about channel change. References: <1424217588-29558-1-git-send-email-greearb@candelatech.com> (sfid-20150218_005956_617537_D2A9B91F) <1424692155.2782.6.camel@sipsolutions.net> <54EB66CC.1030800@candelatech.com> <1424772714.2192.16.camel@sipsolutions.net> <54EC8C5D.5090400@candelatech.com> <1424788834.2192.34.camel@sipsolutions.net> <5500AE12.6040103@candelatech.com> <1427812067.2057.27.camel@sipsolutions.net> <551AC3B6.1040001@candelatech.com> <1428999215.3019.6.camel@sipsolutions.net> In-Reply-To: <1428999215.3019.6.camel@sipsolutions.net> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 04/14/2015 01:13 AM, Johannes Berg wrote: > On Tue, 2015-03-31 at 08:56 -0700, Ben Greear wrote: > >>> Well, depends. Our driver just asks the firmware to do the scan, and it >>> will do all the scheduling by itself, i.e. it'll go through the channels >>> at convenient times etc. >> >> I do not want to offload scanning in user-space, which is the equivalent >> of what your driver is doing as far as the kernel is concerned? If someone wants >> to do that in the future, then sure, they can implement such a thing. > > Well, the question isn't really that offloading, the question is what > happens with the hw-scan logic in hwsim? Though I guess now that I think > about it, that wouldn't show up in userspace at all with your changes. I think for HW scan and related matters, you treat user-space like a firmware target, so you send it a message, and then get some response or action, similar to how you would request ath10k or some USB dongle NIC to do things for you. My own interest in hwsim user-space is to make it act more like ath9k than a firmware target driver, but I don't think my changes preclude doing target based emulation in the future. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com