From owner-freebsd-hackers@FreeBSD.ORG Mon May 23 14:13:44 2011 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 486B41065670 for ; Mon, 23 May 2011 14:13:44 +0000 (UTC) (envelope-from philip-freebsd1@soeberg.net) Received: from pasmtpB.tele.dk (pasmtpb.tele.dk [80.160.77.98]) by mx1.freebsd.org (Postfix) with ESMTP id 0803B8FC19 for ; Mon, 23 May 2011 14:13:43 +0000 (UTC) Received: from mail.soeberg.net (0x573f534a.cpe.ge-1-1-0-1109.bynqu1.customer.tele.dk [87.63.83.74]) by pasmtpB.tele.dk (Postfix) with ESMTP id 7B952E3023B for ; Mon, 23 May 2011 16:13:42 +0200 (CEST) Received: from [192.168.1.199] ([192.168.1.199]) (authenticated user philip@soeberg.net) by mail.soeberg.net (using TLSv1/SSLv3 with cipher AES256-SHA (256 bits)) for freebsd-hackers@freebsd.org; Mon, 23 May 2011 16:13:43 +0200 Message-ID: <4DDA6B95.3090704@soeberg.net> Date: Mon, 23 May 2011 16:13:41 +0200 From: Philip Soeberg User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 MIME-Version: 1.0 To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: device_detach() on a device used by ixgbe driver (FreeBSD 7-STABLE through to 9-CURRENT) X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: philip-freebsd1@soeberg.net List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 May 2011 14:13:44 -0000 Hi fellow FreeBSD hackers, I've just completed designing a new driver for the Intels IXGBE suite of network adapters, but is building my driver as a kernel module to be loaded after system boot. The current sys/dev/ixgbe/ixgbe.c driver which attach to Intels adapters return a zero in it's probe() function (which equals to BUS_PROBE_SPECIFIC).. This has the distinct disadvantage that I cannot, through my module, call a device_detach() on the devices I support, and afterward expect being probed for them. A BUS_PROBE_SPECIFIC, according to wording in sys/sys/bus.h, inform the OS that "Only I can use this device". I assume this (transcanding from FreeBSD 7.0-STABLE through to FreeBSD 9-CURRENT) is in error? I would expect sys/dev/ixgbe/ixgbe.c's probe() function to return BUS_PROBE_DEFAULT, which is the "Base OS default driver".. If this is true, then we should probably also update sys/kern/device_if.m's description of the probe() method as to reflect the BUS_PROBE_* return values in a clearer way than is currently described. Do you want me to provide a patch? (it's really a one liner for ixgbe.c and a couple of alterations to the device_if.m, if need be) I would also expect the ixgbe.c driver to do a quick resource_disabled() in it's attach() function, so that we can disable specific adapters through kenv hint.ix.0.disabled=1.. Given that I can't use device_detach() on a device hogged by the IXGBE driver, can any one of you help me with a way around this problem? I can't use the hints, and I can't detach() the device.. how can I get my kernel module to attach the device? Thanks, Phil