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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37F96C4332F for ; Sun, 12 Nov 2023 11:09:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229543AbjKLLJZ (ORCPT ); Sun, 12 Nov 2023 06:09:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229536AbjKLLJY (ORCPT ); Sun, 12 Nov 2023 06:09:24 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 209D02D62 for ; Sun, 12 Nov 2023 03:09:21 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id EBE72C433C8; Sun, 12 Nov 2023 11:09:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699787360; bh=uAwJfcPxifN1IFgJyCqdZCneQ3IO9cQNDhSVK351WmI=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=MbON22SccwvhS6omwAME3RaTK/3JuO8cWIdXbrGQAHX/LepltxVkeie1CJjjBqliF 6NqOQN2jzA9NakiuCsvU1e9IjXJ3Ra+UjT4n+REOcoW+IhAkNRwf28fl4g9MnsxMjQ cwFXtzOudM+0a1GNXXkOPHrbSSSioXQtls9ua5XRrxikox4LaV2WNlaGRlBeMILu52 iMf260eUF7WXs/jQ9TITXHZaC90n4TuJvUW7Lx10998vlY/iU85ZRGB8jcdnjlvLU1 U65qENcZhpK5aguNnXa1BetIX626m4iKdJ1SNpOIvu9u6m+ADUpR+wcdgG+HZ/LNaX dmUP3ThuRGtXg== Message-ID: <0f0467f396777722022403727824104b4f0a8d85.camel@kernel.org> Subject: Re: [PATCH v4 0/3] convert write_threads, write_version and write_ports to netlink commands From: Jeff Layton To: Lorenzo Bianconi Cc: linux-nfs@vger.kernel.org, lorenzo.bianconi@redhat.com, neilb@suse.de, chuck.lever@oracle.com, netdev@vger.kernel.org, kuba@kernel.org Date: Sun, 12 Nov 2023 06:09:18 -0500 In-Reply-To: References: <7fdd6dd0d8ab75181eb350f78a4822a039cacaa5.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.1 (3.50.1-1.fc39) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On Sun, 2023-11-12 at 11:02 +0100, Lorenzo Bianconi wrote: > > On Sat, 2023-11-04 at 12:13 +0100, Lorenzo Bianconi wrote: > > > Introduce write_threads, write_version and write_ports netlink > > > commands similar to the ones available through the procfs. > > >=20 > > > Changes since v3: > > > - drop write_maxconn and write_maxblksize for the moment > > > - add write_version and write_ports commands > > > Changes since v2: > > > - use u32 to store nthreads in nfsd_nl_threads_set_doit > > > - rename server-attr in control-plane in nfsd.yaml specs > > > Changes since v1: > > > - remove write_v4_end_grace command > > > - add write_maxblksize and write_maxconn netlink commands > > >=20 > > > This patch can be tested with user-space tool reported below: > > > https://github.com/LorenzoBianconi/nfsd-netlink.git > > > This series is based on the commit below available in net-next tree > > >=20 > > > commit e0fadcffdd172d3a762cb3d0e2e185b8198532d9 > > > Author: Jakub Kicinski > > > Date: Fri Oct 6 06:50:32 2023 -0700 > > >=20 > > > =A0=A0=A0=A0tools: ynl-gen: handle do ops with no input attrs > > >=20 > > > =A0=A0=A0=A0The code supports dumps with no input attributes currentl= y > > > =A0=A0=A0=A0thru a combination of special-casing and luck. > > > =A0=A0=A0=A0Clean up the handling of ops with no inputs. Create empty > > > =A0=A0=A0=A0Structs, and skip printing of empty types. > > > =A0=A0=A0=A0This makes dos with no inputs work. > > >=20 > > > Lorenzo Bianconi (3): > > > =A0=A0NFSD: convert write_threads to netlink commands > > > =A0=A0NFSD: convert write_version to netlink commands > > > =A0=A0NFSD: convert write_ports to netlink commands > > >=20 > > > =A0Documentation/netlink/specs/nfsd.yaml | 83 ++++++++ > > > =A0fs/nfsd/netlink.c | 54 ++++++ > > > =A0fs/nfsd/netlink.h | 8 + > > > =A0fs/nfsd/nfsctl.c | 267 ++++++++++++++++++++++= +++- > > > =A0include/uapi/linux/nfsd_netlink.h | 30 +++ > > > =A0tools/net/ynl/generated/nfsd-user.c | 254 ++++++++++++++++++++++= ++ > > > =A0tools/net/ynl/generated/nfsd-user.h | 156 +++++++++++++++ > > > =A07 files changed, 845 insertions(+), 7 deletions(-) > > >=20 > >=20 > > Nice work, Lorenzo! Now comes the bikeshedding... >=20 > Hi Jeff, >=20 > >=20 > > With the nfsdfs interface, we sort of had to split things up into > > multiple files like this, but it has some drawbacks, in particular with > > weird behavior when people do things out of order. >=20 > what do you mean with 'weird behavior'? Something not expected? >=20 Yeah. For instance, if you set up sockets but never write anything to the "threads" file, those sockets will sit around in perpetuity. Granted most people use rpc.nfsd to start the server, so this generally doesn't happen often, but it's always been a klunky interface regardless. > >=20 > > Would it make more sense to instead have a single netlink command that > > sets up ports and versions, and then spawns the requisite amount of > > threads, all in one fell swoop? >=20 > I do not have a strong opinion about it but I would say having a dedicate= d > set/get for each paramater allow us to have more granularity (e.g. if you= want > to change just a parameter we do not need to send all of them to the kern= el). > What do you think? >=20 It's pretty rare to need to twiddle settings on the server while it's up and running. Restarting the server in the face of even minor changes is not generally a huge problem, so I don't see this as necessary. Also, it's always been a bit hit and miss as to which settings take immediate effect. For instance, if I (e.g.) turn off NFSv4 serving altogether on a running server, it doesn't purge the existing NFSv4 state, but v4 RPCs would be immediately rejected. Eventually it would time out, but it is odd. Personally, I think this is amenable to a declarative interface: Have userland always send down a complete description of what the server should look like, and then the kernel can do what it needs to make that happen (starting/stopping threads, opening/closing sockets, changing versions served, etc.). > >=20 > > That does presuppose we can send down a variable-length frame though, > > but I assume that is possible with netlink. >=20 > sure, we can do it. --=20 Jeff Layton