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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BD659C38A2D for ; Mon, 24 Oct 2022 11:00:44 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.428861.679425 (Exim 4.92) (envelope-from ) id 1omvC0-0006w4-8Z; Mon, 24 Oct 2022 11:00:28 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 428861.679425; Mon, 24 Oct 2022 11:00:28 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1omvC0-0006vx-5E; Mon, 24 Oct 2022 11:00:28 +0000 Received: by outflank-mailman (input) for mailman id 428861; Mon, 24 Oct 2022 11:00:26 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1omvBy-0006vr-8t for xen-devel@lists.xenproject.org; Mon, 24 Oct 2022 11:00:26 +0000 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 0f044e2c-538b-11ed-91b5-6bf2151ebd3b; Mon, 24 Oct 2022 13:00:24 +0200 (CEST) Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-257-Qtw4snbNPCawDnP8qruIEA-1; Mon, 24 Oct 2022 07:00:19 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 69972299E759; Mon, 24 Oct 2022 11:00:18 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.195.118]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C6B2440C2064; Mon, 24 Oct 2022 11:00:16 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id DEAAD21E6936; Mon, 24 Oct 2022 13:00:09 +0200 (CEST) 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: 0f044e2c-538b-11ed-91b5-6bf2151ebd3b DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666609223; 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: in-reply-to:in-reply-to:references:references; bh=JPt5T8Uiv1CdWndjYYsC1Y8mTRQPX3OEHe0yHwxlQJc=; b=QXomIgjjRwKbLy3km5dpd9tMbrmH2ExUd65ixbtTCqHm7Yi7MFKSbC529LPFE/SnnkTH7/ XKrcmjFWYlw7C1Wv87lcjKUpLiRYbygW6mUt4m32YnZtgh7aMtlnEE0+ECRntM0v08Ma1S Mp4oiKduukhbGC8HRQiMvR7hUpX3FVM= X-MC-Unique: Qtw4snbNPCawDnP8qruIEA-1 From: Markus Armbruster To: Stefano Brivio Cc: Laurent Vivier , qemu-devel@nongnu.org, Paul Durrant , Thomas Huth , Daniel P. =?utf-8?Q?Berrang=C3=A9?= , "Dr. David Alan Gilbert" , Greg Kurz , Stefano Stabellini , David Gibson , Eric Blake , xen-devel@lists.xenproject.org, "Michael S. Tsirkin" , Stefan Weil , Paolo Bonzini , Jason Wang , Samuel Thibault , Anthony Perard Subject: Re: [PATCH v13 17/17] net: stream: add QAPI events to report connection state References: <20221020162558.123284-1-lvivier@redhat.com> <20221020162558.123284-18-lvivier@redhat.com> <87pmel4th4.fsf@pond.sub.org> <52e989b9-6f8d-99c6-ef04-3ce32006b002@redhat.com> <87lep935hn.fsf@pond.sub.org> Date: Mon, 24 Oct 2022 13:00:09 +0200 In-Reply-To: <87lep935hn.fsf@pond.sub.org> (Markus Armbruster's message of "Fri, 21 Oct 2022 11:12:20 +0200") Message-ID: <87tu3tsczq.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 Markus Armbruster writes: > Cc: Stefano Brivio > > Laurent Vivier writes: > >> On 10/21/22 07:48, Markus Armbruster wrote: >>> Laurent Vivier writes: >>> >>>> The netdev reports NETDEV_STREAM_CONNECTED event when the backend >>>> is connected, and NETDEV_STREAM_DISCONNECTED when it is disconnected. >>> >>> Use cases? >> >> This is asked by Stefano Brivio to allow libvirt to detect if connection to passt is lost and to restart passt. [...] >>> Could similar event signalling be useful for other kinds of netdev >>> backends? >> >> I was wondering, but it becomes more complicated to be generic. > > Making something complicated and generic where a simpler special > solution would do is the worst. > > Not quite as bad (but still plenty bad) is making a few special > solutions first, then replace them all with a generic solution. > > I believe we should have a good, hard think on possible applications of > a generic solution now. > > There is no need to hold back this series for that. > > If we conclude a generic solution is called for, we better replace this > special solution before it becomes ABI. Either by replacing it before > we release it, or by keeping it unstable until we replace it. Stefano, any thoughts on this?