From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57C901F1515; Tue, 11 Feb 2025 09:33:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739266417; cv=none; b=lbGScaFk6vlb+fD4sywiqfm96Fnw4ynYJ3Hdvn8XRd3NRIx0wl7K/aWH42AWD64qONj0JXWEEqwnygGz8MqIzIlKsonRaOkbHl6uh7TffdDgR5R5FEIe+xplEuofL9K4IvC+hA/1TBxIWBah73ZFsE3ik6zn93kBzrkfq6/DjVM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739266417; c=relaxed/simple; bh=4vSZl2WPnLw3OPkUSssErIRZUxNMaeRRqYU17OwHZg4=; h=Date:From:To:CC:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=LnyTDrZext2gD2Rn5AesVe411MYaCluIHWyeNxdci5mcXW5ksFzFXZDNalgy0PMw+j4dLY1EyWBAzsI1NFZIytuEQtjlAsfV/dIoNrdWyomUjqvGgzQCN1Ltuk76Msc0E98SX8nKaGFL4KoTSSzzh2wsbw5AxlOEAL00dGQyaHs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Ysblb4lCXz67sgR; Tue, 11 Feb 2025 17:30:35 +0800 (CST) Received: from frapeml500008.china.huawei.com (unknown [7.182.85.71]) by mail.maildlp.com (Postfix) with ESMTPS id 20C941404F5; Tue, 11 Feb 2025 17:33:32 +0800 (CST) Received: from localhost (10.203.177.66) by frapeml500008.china.huawei.com (7.182.85.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 11 Feb 2025 10:33:31 +0100 Date: Tue, 11 Feb 2025 09:33:29 +0000 From: Jonathan Cameron To: Dave Jiang CC: Jason Gunthorpe , Andy Gospodarek , Aron Silverton , Dan Williams , Daniel Vetter , David Ahern , Andy Gospodarek , Christoph Hellwig , Itay Avraham , Jiri Pirko , Jakub Kicinski , Leonid Bloch , Leon Romanovsky , , , , Saeed Mahameed , "Nelson, Shannon" Subject: Re: [PATCH v4 00/10] Introduce fwctl subystem Message-ID: <20250211093329.00000b95@huawei.com> In-Reply-To: References: <0-v4-0cf4ec3b8143+4995-fwctl_jgg@nvidia.com> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: lhrpeml500011.china.huawei.com (7.191.174.215) To frapeml500008.china.huawei.com (7.182.85.71) On Fri, 7 Feb 2025 14:58:51 -0700 Dave Jiang wrote: > On 2/6/25 5:13 PM, Jason Gunthorpe wrote: > > [ > > Many people were away around the holiday period, but work is back in full > > swing now with Dave already at v3 on his CXL work over the past couple > > weeks. We are looking at a good chance of reaching this merge window. I > > will work out some shared branches with CXL and get it into linux-next > > once all three drivers can be assembled and reviews seem to be concluding. > > > > There are couple open notes > > - Greg was interested in a new name, but nobody offered any bikesheds > > - I would like a co-maintainer > > I volunteer as tribute. :) > > I got the CXL series rebased and tested on top of this series. So you can add > Tested-by: Dave Jiang > for the core FWCTL bits in the series. This is an area I plan to keep reviewing (and adding more use cases), so feel free to add me as a Reviewer or Maintainer (depending on how guilty you want me to feel if there is a backlog to review :) Will save me making sure to track these down as they get posted in different subsystems. Thanks, Jonathan > > I'll post the CXL FWCTL series v4 shortly. > > DJ > > > ] > > > > fwctl is a new subsystem intended to bring some common rules and order to > > the growing pattern of exposing a secure FW interface directly to > > userspace. Unlike existing places like RDMA/DRM/VFIO/uacce that are > > exposing a device for datapath operations fwctl is focused on debugging, > > configuration and provisioning of the device. It will not have the > > necessary features like interrupt delivery to support a datapath. > > > > This concept is similar to the long standing practice in the "HW" RAID > > space of having a device specific misc device to manage the RAID > > controller FW. fwctl generalizes this notion of a companion debug and > > management interface that goes along with a dataplane implemented in an > > appropriate subsystem. > > > > The need for this has reached a critical point as many users are moving to > > run lockdown enabled kernels. Several existing devices have had long > > standing tooling for management that relied on /sys/../resource0 or PCI > > config space access which is not permitted in lockdown. A major point of > > fwctl is to define and document the rules that a device must follow to > > expose a lockdown compatible RPC. > > > > Based on some discussion fwctl splits the RPCs into four categories > > > > FWCTL_RPC_CONFIGURATION > > FWCTL_RPC_DEBUG_READ_ONLY > > FWCTL_RPC_DEBUG_WRITE > > FWCTL_RPC_DEBUG_WRITE_FULL > > > > Where the latter two trigger a new TAINT_FWCTL, and the final one requires > > CAP_SYS_RAWIO - excluding it from lockdown. The device driver and its FW > > would be responsible to restrict RPCs to the requested security scope, > > while the core code handles the tainting and CAP checks. > > > > For details see the final patch which introduces the documentation. > > > > The CXL FWCTL driver is now in it own series on v3: > > https://lore.kernel.org/r/20250204220430.4146187-1-dave.jiang@intel.com > > > > I'm expecting a 3rd driver (from Shannon @ Pensando) to be posted right > > away, the github version I saw looked good. I've got soft commitments for > > about 6 drivers in total now. > > > > There have been three LWN articles written discussing various aspects of > > this proposal: > > > > https://lwn.net/Articles/955001/ > > https://lwn.net/Articles/969383/ > > https://lwn.net/Articles/990802/ > > > > A really giant ksummit thread preceding a discussion at the Maintainer > > Summit: > > > > https://lore.kernel.org/ksummit/668c67a324609_ed99294c0@dwillia2-xfh.jf.intel.com.notmuch/ > > > > Several have expressed general support for this concept: > > > > AMD/Pensando - https://lore.kernel.org/linux-rdma/20241205222818.44439-1-shannon.nelson@amd.com > > Broadcom Networking - https://lore.kernel.org/r/Zf2n02q0GevGdS-Z@C02YVCJELVCG > > Christoph Hellwig - https://lore.kernel.org/r/Zcx53N8lQjkpEu94@infradead.org > > Daniel Vetter - https://lore.kernel.org/r/ZrHY2Bds7oF7KRGz@phenom.ffwll.local > > Enfabrica - https://lore.kernel.org/r/9cc7127f-8674-43bc-b4d7-b1c4c2d96fed@kernel.org > > NVIDIA Networking > > Oded Gabbay/Habana - https://lore.kernel.org/r/ZrMl1bkPP-3G9B4N@T14sgabbay. > > Oracle Linux - https://lore.kernel.org/r/6lakj6lxlxhdgrewodvj3xh6sxn3d36t5dab6najzyti2navx3@wrge7cyfk6nq > > SuSE/Hannes - https://lore.kernel.org/r/2fd48f87-2521-4c34-8589-dbb7e91bb1c8@suse.com > > > > Work is ongoing for userspace, currently the mellanox tool suite has been > > ported over: > > https://github.com/Mellanox/mstflint > > > > And a more simplified example how to use it: > > https://github.com/jgunthorpe/mlx5ctl.git > > > > This is on github: https://github.com/jgunthorpe/linux/commits/fwctl > > > > v4: > > - Rebase to v6.14-rc1 > > - Fine tune comments and rst documentatin > > - Adjust cleanup.h usage - remove places that add more ofuscation than > > value > > - CXL is back to its own independent series > > - Increase FWCTL_MAX_DEVICES to 4096, someone hit the limit > > - Fix mlx5ctl_validate_rpc() logic around scope checking > > - Disable mlx5ctl on SFs > > v3: https://patch.msgid.link/r/0-v3-960f17f90f17+516-fwctl_jgg@nvidia.com > > - Rebase to v6.11-rc4 > > - Add a squashed version of David's CXL series as the 2nd driver > > - Add missing includes > > - Improve comments based on feedback > > - Use the kdoc format that puts the member docs inside the struct > > - Rewrite fwctl_alloc_device() to be clearer > > - Incorporate all remarks for the documentation > > v2: https://lore.kernel.org/r/0-v2-940e479ceba9+3821-fwctl_jgg@nvidia.com > > - Rebase to v6.10-rc5 > > - Minor style changes > > - Follow the style consensus for the guard stuff > > - Documentation grammer/spelling > > - Add missed length output for mlx5 get_info > > - Add two more missed MLX5 CMD's > > - Collect tags > > v1: https://lore.kernel.org/r/0-v1-9912f1a11620+2a-fwctl_jgg@nvidia.com > > > > Andy Gospodarek (2): > > fwctl/bnxt: Support communicating with bnxt fw > > bnxt: Create an auxiliary device for fwctl_bnxt > > > > Jason Gunthorpe (6): > > fwctl: Add basic structure for a class subsystem with a cdev > > fwctl: Basic ioctl dispatch for the character device > > fwctl: FWCTL_INFO to return basic information about the device > > taint: Add TAINT_FWCTL > > fwctl: FWCTL_RPC to execute a Remote Procedure Call to device firmware > > fwctl: Add documentation > > > > Saeed Mahameed (2): > > fwctl/mlx5: Support for communicating with mlx5 fw > > mlx5: Create an auxiliary device for fwctl_mlx5 > > > > Documentation/admin-guide/tainted-kernels.rst | 5 + > > Documentation/userspace-api/fwctl/fwctl.rst | 285 ++++++++++++ > > Documentation/userspace-api/fwctl/index.rst | 12 + > > Documentation/userspace-api/index.rst | 1 + > > .../userspace-api/ioctl/ioctl-number.rst | 1 + > > MAINTAINERS | 16 + > > drivers/Kconfig | 2 + > > drivers/Makefile | 1 + > > drivers/fwctl/Kconfig | 32 ++ > > drivers/fwctl/Makefile | 6 + > > drivers/fwctl/bnxt/Makefile | 4 + > > drivers/fwctl/bnxt/bnxt.c | 167 +++++++ > > drivers/fwctl/main.c | 416 ++++++++++++++++++ > > drivers/fwctl/mlx5/Makefile | 4 + > > drivers/fwctl/mlx5/main.c | 340 ++++++++++++++ > > drivers/net/ethernet/broadcom/bnxt/bnxt.c | 3 + > > drivers/net/ethernet/broadcom/bnxt/bnxt.h | 3 + > > drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.c | 126 +++++- > > drivers/net/ethernet/broadcom/bnxt/bnxt_ulp.h | 4 + > > drivers/net/ethernet/mellanox/mlx5/core/dev.c | 9 + > > include/linux/fwctl.h | 135 ++++++ > > include/linux/panic.h | 3 +- > > include/uapi/fwctl/bnxt.h | 27 ++ > > include/uapi/fwctl/fwctl.h | 140 ++++++ > > include/uapi/fwctl/mlx5.h | 36 ++ > > kernel/panic.c | 1 + > > tools/debugging/kernel-chktaint | 8 + > > 27 files changed, 1782 insertions(+), 5 deletions(-) > > create mode 100644 Documentation/userspace-api/fwctl/fwctl.rst > > create mode 100644 Documentation/userspace-api/fwctl/index.rst > > create mode 100644 drivers/fwctl/Kconfig > > create mode 100644 drivers/fwctl/Makefile > > create mode 100644 drivers/fwctl/bnxt/Makefile > > create mode 100644 drivers/fwctl/bnxt/bnxt.c > > create mode 100644 drivers/fwctl/main.c > > create mode 100644 drivers/fwctl/mlx5/Makefile > > create mode 100644 drivers/fwctl/mlx5/main.c > > create mode 100644 include/linux/fwctl.h > > create mode 100644 include/uapi/fwctl/bnxt.h > > create mode 100644 include/uapi/fwctl/fwctl.h > > create mode 100644 include/uapi/fwctl/mlx5.h > > > > > > base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b > >