From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by 2002:a19:ee01:0:0:0:0:0 with SMTP id g1csp3711420lfb; Mon, 18 May 2020 22:36:01 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyMZWhGxGD7F+pCQnNHVG05s2RxcMFbRdg7sPpK+F9zpzD4nX1OnjKTG9kwzR4kSB2AceC4 X-Received: by 2002:ac8:23e3:: with SMTP id r32mr20397455qtr.268.1589866560840; Mon, 18 May 2020 22:36:00 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1589866560; cv=none; d=google.com; s=arc-20160816; b=AM/PLuHrdfhDDTKhCPF++WvtjJ74CLwHCG1ZaUjkTsqaqTzqltbHgF4TlrGWadKhN7 PpVKjOkRUyLvVe95clyZddEb+x9zMjyhFpNWsNTglHMnViXPW178pFxYO3fynyBItcui zen8MftRmLcr/ZvKRr7MCDe5ePf4lDlqK8iCm4/8aKW6LmD4XqvfNmia/NFrJm9Ke8Lv 8o9Cnt8AVPNT7zJJZfs0HMf6Tl7eZvIm0LxRbRFgqTuw4z3Y3KeQXKHMCi6JSk7h2Wtr 4FDCIh0r1XRDcBPs0jhcXzEts5T1HBn86pjNnXGuuv/a0+lzGvNmKi69wIsv6IvkNwXe WJTw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:user-agent:message-id:in-reply-to:date:references :subject:to:from:dkim-signature; bh=yl/NdjkSERlFIYKD5YMww9oWB5JG0yKSHH2b5ZfW8Is=; b=0PSz1HBzoPcCOt5HS2kwb54b1eHzKQaa2ik5Kbdb/BKP/1u63MQfBkC+4Xcp38zzUC 6crf65ytZZgrfRUoYv9qcOX9yO+gtGJ/yslMq2aXw7SFuzj4JQFtdDkCRZql8FwUHD3c BUGgl41z9+vrDb1iE7Dg/Y2eg7wOMExh/JWTyDKlWNH9uNf6KQuow/8W9j/OIl+4w11k Yp/y06fHGDal9aBUWJlT/2+sUfEWAaMN9Wa/QnHUpRD/xxNKRz3eMLzdGCVmlSE0gayX 450f+Q0Kbb+R/+4yKLJZ4XE/0LPPOJ0ZMNMcDliElKlDY+J91cLNzjPlyaUpmm/OC8MI 8aZQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=e+M5VTTz; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id m13si5373787qti.63.2020.05.18.22.36.00 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 18 May 2020 22:36:00 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=e+M5VTTz; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:38702 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jauv2-0006Co-AV for alex.bennee@linaro.org; Tue, 19 May 2020 01:36:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34596) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jauut-0006Cb-QG for qemu-arm@nongnu.org; Tue, 19 May 2020 01:35:51 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:43720 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jauus-0000J8-11 for qemu-arm@nongnu.org; Tue, 19 May 2020 01:35:51 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589866548; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=yl/NdjkSERlFIYKD5YMww9oWB5JG0yKSHH2b5ZfW8Is=; b=e+M5VTTz2XwKCydh/MHfFeoAyOWsSNDnCj/oOPLOJuI5fGNcyvlDpLvbiExs3eAbpVZgL4 unc/EnBmuODO/p2s9+If4ZDyX6Bm/X8R+YJ3DQJ0lwsrwTPKfpu0jEr8ci7mzOW9MRrEUD kW+BckDldpoxeqZpS8usRmD42rVKdTo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-107-cV8aZ-Y9PwqbVFlLH6Dq2Q-1; Tue, 19 May 2020 01:35:46 -0400 X-MC-Unique: cV8aZ-Y9PwqbVFlLH6Dq2Q-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C9E08107ACCA; Tue, 19 May 2020 05:35:44 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-112-32.ams2.redhat.com [10.36.112.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 529AE10013D9; Tue, 19 May 2020 05:35:44 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id BBC6211358BC; Tue, 19 May 2020 07:35:42 +0200 (CEST) From: Markus Armbruster To: Joel Stanley Subject: Re: [PATCH 04/24] aspeed: Don't create unwanted "ftgmac100", "aspeed-mmi" devices References: <20200518050408.4579-1-armbru@redhat.com> <20200518050408.4579-5-armbru@redhat.com> <9fc4a6e2-fa90-ba62-91cf-e22eb3ef4cdc@kaod.org> Date: Tue, 19 May 2020 07:35:42 +0200 In-Reply-To: (Joel Stanley's message of "Tue, 19 May 2020 00:38:51 +0000") Message-ID: <87zha45vwx.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=207.211.31.120; envelope-from=armbru@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/19 00:34:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , berrange@redhat.com, Eduardo Habkost , Andrew Jeffery , QEMU Developers , qemu-arm , =?utf-8?Q?C=C3=A9dric?= Le Goater , Paolo Bonzini Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: alFqKNs8wIDI Joel Stanley writes: > On Mon, 18 May 2020 at 12:19, C=C3=A9dric Le Goater wrote: >> >> On 5/18/20 7:03 AM, Markus Armbruster wrote: >> > These devices are optional, and controlled by @nb_nics. >> > aspeed_soc_ast2600_init() and aspeed_soc_init() create the maximum >> > supported number. aspeed_soc_ast2600_realize() and >> > aspeed_soc_realize() realize only the wanted number. Works, although >> > it can leave unrealized devices hanging around in the QOM composition >> > tree. Affects machines ast2500-evb, ast2600-evb, palmetto-bmc, >> > romulus-bmc, swift-bmc, tacoma-bmc, and witherspoon-bmc. >> > >> > Make the init functions create only the wanted ones. Visible in "info >> > qom-tree"; here's the change for ast2600-evb: >> > >> > /machine (ast2600-evb-machine) >> > [...] >> > /soc (ast2600-a1) >> > [...] >> > /ftgmac100[0] (ftgmac100) >> > /ftgmac100[0] (qemu:memory-region) >> > - /ftgmac100[1] (ftgmac100) >> > - /ftgmac100[2] (ftgmac100) >> > - /ftgmac100[3] (ftgmac100) >> > /gpio (aspeed.gpio-ast2600) >> > [...] >> > /mii[0] (aspeed-mmi) >> > /aspeed-mmi[0] (qemu:memory-region) >> > - /mii[1] (aspeed-mmi) >> > - /mii[2] (aspeed-mmi) >> > - /mii[3] (aspeed-mmi) >> > /rtc (aspeed.rtc) >> > >> > I'm not sure creating @nb_nics devices makes sense. How many does the >> > physical chip provide? >> >> The AST2400, AST2500 SoC have 2 macs and the AST2600 has 4. Each machine >> define the one it uses, generally MAC0 but the tacoma board uses MAC3. >> >> Shouldn't the model reflect the real address space independently from >> the NIC backends defined on the command line ? > > Agreed, the MAC hardware is present in all instances of the AST2600, > so they should be present in qemu. Only some boards wire up a network > device to the other side. I guess an unwired NIC behaves as if no cable was plugged into the external connector ("no carrier"). We can model that. > It would be advantageous for us to be able to specify which device is > being connected to on the command line. Currently we do this by > connecting all devices up to the one we care about which is an ugly > workaround. We use -nic to configure onboard NICs. The configuration gets deposited in nd_table[] for board code to pick up. Boards use nd_table[0] for their first NIC, nd_table[1] for the second, and so forth. How they order their NICs is part of their stable user interface. To leave a NIC unplugged, use -nice none. Example: -nic none -nic user leaves the first NIC unplugged, and plugs the second one using a user network backend. Say the board contains a SoC that provides four NICs, but the board wires up only the last one. Then board code should use nd_table[0] for that last one. I don't remember whether network device frontends can work without a backend, or need a null backend. If the latter, then board code needs to supply such null backends. >> How should we proceed in such cases ? Model the physical hardware as faithfully as we can. Follow-up patches welcome!