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[192.237.175.120]) by mx.google.com with ESMTPS id da4-20020a05690c0d8400b00602bb9a8971si722933ywb.460.2024.01.26.06.36.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Jan 2024 06:36:15 -0800 (PST) Received-SPF: pass (google.com: domain of xen-devel-bounces@lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=casper.20170209 header.b=TjpklgRv; spf=pass (google.com: domain of xen-devel-bounces@lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.672043.1045662 (Exim 4.92) (envelope-from ) id 1rTNIi-0000Eb-FO; Fri, 26 Jan 2024 14:35:24 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 672043.1045662; Fri, 26 Jan 2024 14:35:24 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rTNIi-0000EU-CT; Fri, 26 Jan 2024 14:35:24 +0000 Received: by outflank-mailman (input) for mailman id 672043; Fri, 26 Jan 2024 14:35:23 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rTNIh-0000EO-0e for xen-devel@lists.xenproject.org; Fri, 26 Jan 2024 14:35:23 +0000 Received: from casper.infradead.org (casper.infradead.org [2001:8b0:10b:1236::1]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 214c2a50-bc58-11ee-98f5-efadbce2ee36; Fri, 26 Jan 2024 15:35:20 +0100 (CET) Received: from [2001:8b0:10b:5:d160:e4ac:a057:38f5] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rTNI6-0000000DsbK-2bpX; Fri, 26 Jan 2024 14:34:48 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 214c2a50-bc58-11ee-98f5-efadbce2ee36 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=QOJP6Wa3K3U5hGRKT2qp+mvLpiYLUlN1d8vR6m8nLds=; b=TjpklgRv6mOXFqvrAQ8l3AK33b zo3MZ8+2o6pHS5jkzyyTac81MDBnlHh0U7NaVQD+MeY3Nb7lA5d1LpOfUpJzz9COG6zVwEYA8SVfZ x2hY/7f5ZIPhNa5Z3f6FH5WO+UKJht0YHKMcgJv3RyI9I2ZgdcKxDuQr2RUUbUOFjmS9Rf9YEjoNf s0qdGm+qTPNXQcfmmRT4y9A6FnDhN4TBFygUtSGpWcE7Wi97DVediYheZeaP8iaTfYEWOitwxHRlC uZ7AxS4IHTf5hnJucYXmU3STlXWtYu0pkniRvObwI2tR2aX7hcOewjmqgShOuX9d50C2G6sizE/8d fupgyG4w==; Message-ID: <20c19bd1f19ebc2b1c0100f447a709dda076f721.camel@infradead.org> Subject: Re: [PATCH v3 01/46] net: add qemu_{configure, create}_nic_device(), qemu_find_nic_info() From: David Woodhouse To: Thomas Huth , qemu-devel@nongnu.org Cc: Richard Henderson , Beniamino Galvani , Peter Maydell , Strahinja Jankovic , Niek Linnenbank , =?ISO-8859-1?Q?C=E9dric?= Le Goater , Andrew Jeffery , Joel Stanley , Igor Mitsyanko , Jean-Christophe Dubois , Andrey Smirnov , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Rob Herring , Subbaraya Sundeep , Jan Kiszka , Tyrone Ting , Hao Wu , Radoslaw Biernacki , Leif Lindholm , Marcin Juszkiewicz , "Edgar E. Iglesias" , Alistair Francis , Helge Deller , Paolo Bonzini , Eduardo Habkost , "Michael S. Tsirkin" , Marcel Apfelbaum , Song Gao , Thomas Huth , Laurent Vivier , Huacai Chen , Jiaxun Yang , =?ISO-8859-1?Q?Herv=E9?= Poussineau , Aleksandar Rikalo , Aurelien Jarno , Jason Wang , Jia Liu , Stafford Horne , Mark Cave-Ayland , Nicholas Piggin , Daniel Henrique Barboza , David Gibson , Harsh Prateek Bora , Bin Meng , Palmer Dabbelt , Weiwei Li , Liu Zhiwei , Halil Pasic , Christian Borntraeger , Eric Farman , David Hildenbrand , Ilya Leoshkevich , Yoshinori Sato , Magnus Damm , Artyom Tarasenko , Stefano Stabellini , Anthony Perard , Paul Durrant , Max Filippov , qemu-arm@nongnu.org, qemu-ppc@nongnu.org, qemu-riscv@nongnu.org, qemu-s390x@nongnu.org, xen-devel@lists.xenproject.org Date: Fri, 26 Jan 2024 14:34:46 +0000 In-Reply-To: <72f116bd-f9ce-4d61-bb21-b615f15eb4b1@redhat.com> References: <20240108204909.564514-1-dwmw2@infradead.org> <20240108204909.564514-2-dwmw2@infradead.org> <9218c20b-8ba8-402b-bea5-856cb51156dc@redhat.com> <0914e6a51218793cca3121879ef21b39d9aac612.camel@infradead.org> <72f116bd-f9ce-4d61-bb21-b615f15eb4b1@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-H7XB5yYqXr6Val4ZW3cr" User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-TUID: jQq3bYrmCf+e --=-H7XB5yYqXr6Val4ZW3cr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-01-26 at 15:24 +0100, Thomas Huth wrote: > On 26/01/2024 15.16, David Woodhouse wrote: > > On Fri, 2024-01-26 at 12:10 +0100, Thomas Huth wrote: > > >=20 > > > > +/* "Please create a device, if you have a configuration for it" */ > > > > +DeviceState *qemu_create_nic_device(const char *typename, bool mat= ch_default, > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 const= char *alias) > > > > +{ > > > > +=C2=A0=C2=A0=C2=A0 NICInfo *nd =3D qemu_find_nic_info(typename, ma= tch_default, alias); > > > > +=C2=A0=C2=A0=C2=A0 DeviceState *dev; > > > > + > > > > +=C2=A0=C2=A0=C2=A0 if (!nd) { > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 return NULL; > > > > +=C2=A0=C2=A0=C2=A0 } > > >=20 > > > The qemu_check_nic_model() function that was used in some code that y= ou > > > turned into qemu_create_nic_device() used to set: > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if (!nd->model) > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nd->model =3D = g_strdup(default_model); > > >=20 > > > (in the qemu_find_nic_model() function that has been called by > > > qemu_check_nic_model()) > > >=20 > > > Should we do that also here to make sure that nd->model is not NULL a= fterwards? > >=20 > > Good question, but I don't think we care. The qdev_set_nic_properties() > > function certainly doesn't propagate nd->model to anywhere. > >=20 > > I renamed nd->model to nd->modelname in a patch shown below, just to be > > 100% sure I'm not missing any other code paths which might consume it. >=20 > Ok, thanks for checking! Maybe mention it in the patch description in v4,= so=20 > that we've got it recorded somewhere that nd->model might be left at NULL= =20 > afterwards, but that there are no further consumers, so it should be fine= . Makes sense. https://git.infradead.org/?p=3Dusers/dwmw2/qemu.git;a=3Dcommitdiff;h=3D694f= 82bc09080 now says: net: add qemu_{configure,create}_nic_device(), qemu_find_nic_info() Most code which directly accesses nd_table[] and nb_nics uses them for one of two things. Either "I have created a NIC device and I'd like a configuration for it", or "I will create a NIC device *if* there is a configuration for it". With some variants on the theme around whether they actually *check* if the model specified in the configuration is the right one. Provide functions which perform both of those, allowing platforms to be a little more consistent and as a step towards making nd_table[] and nb_nics private to the net code. One might argue that platforms ought to be consistent about whether they create the unconfigured devices or not, but making significant user-visible changes is explicitly *not* the intent right now. The new functions leave the 'model' field of the NICInfo as NULL after using it for the default NIC model, unlike the qemu_check_nic_model() function which does set nd->model to match default_model explicitly. This is acceptable because there is no code which consumes nd->model except this NIC-matching code in net/net.c, and no reasonable excuse for any code wanting to use nd->model in future. Also export the qemu_find_nic_info() helper, as some platforms have special cases they need to handle. 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