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 0EAFEC4332F for ; Wed, 23 Nov 2022 14:18:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229472AbiKWOSi (ORCPT ); Wed, 23 Nov 2022 09:18:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236375AbiKWOSf (ORCPT ); Wed, 23 Nov 2022 09:18:35 -0500 Received: from mail-lf1-x135.google.com (mail-lf1-x135.google.com [IPv6:2a00:1450:4864:20::135]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A142C60685 for ; Wed, 23 Nov 2022 06:18:33 -0800 (PST) Received: by mail-lf1-x135.google.com with SMTP id p8so28321030lfu.11 for ; Wed, 23 Nov 2022 06:18:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rasmusvillemoes.dk; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Cl/DMCkVzUgLuaiNEp4gc18HhldIP35Tm09AOeDeV9U=; b=GgITb1xtbaR4nlUqLZl+/t04P5pi5eDHXqxJ72OCRCj7Ykd9AiqDBcgbeJ2PEvsfUn upWMb02KZ+BbzXJOwUyZ1xgpvC8UJIiZHhB46LMq6OMpEabgn4qYIc1ZjcMhnAcNYwr+ /x0fQC6UDGQQRmr3RHxN4tvq+FGwZ7agPRRKk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Cl/DMCkVzUgLuaiNEp4gc18HhldIP35Tm09AOeDeV9U=; b=1dOzDUcp/nu85a6CVCxwBiuNYAkWvPuMwf8d18cI25dQedMWKCYwvk46RgxQsAhpHk hFQq18OLBUMxQibzTlffj/6mPbjSdURPdes9qlSEEGQO9rrf/65GK8jjPBg3vykrl6yg XwhAR5ws6TNmFpKMlxAx+U4U/TuolawiewD2p1x82H2sJTJKuumumyLr2Ys863+qxfCf sMWEsiRsqhrib70mTfnCa6rKHCOPA2SmcgBsV1pOl1Ma6jd7Be9J0a37RK+XYVgh3OPx TFH1apw8yBXtnNECkWDiqF784mz1hC7mi4ke7rHnRqqPAezpZBL7qwdskpFKI8gbP3fT gqiQ== X-Gm-Message-State: ANoB5pnSh/4W+cMQBZ2tSP0t8OcKEWC/YloboNTW3UTsWyr7IITiZndk ky2NwnIOXtHiq0BMwkJcRkebog== X-Google-Smtp-Source: AA0mqf4xvSwP4X2g4YJ99/oO05IuZxFOSGFck+nzEwQSz6fHILEmuGh1PwnKJkM/qjIpk3hKKfou7w== X-Received: by 2002:a05:6512:3b88:b0:4a3:9533:f4c9 with SMTP id g8-20020a0565123b8800b004a39533f4c9mr3669283lfv.615.1669213111973; Wed, 23 Nov 2022 06:18:31 -0800 (PST) Received: from prevas-ravi.prevas.se ([81.216.59.226]) by smtp.gmail.com with ESMTPSA id k14-20020ac2456e000000b004a478c2f4desm2898619lfm.163.2022.11.23.06.18.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Nov 2022 06:18:31 -0800 (PST) From: Rasmus Villemoes To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Rasmus Villemoes , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] net: loopback: use NET_NAME_PREDICTABLE for name_assign_type Date: Wed, 23 Nov 2022 15:18:28 +0100 Message-Id: <20221123141829.1825170-1-linux@rasmusvillemoes.dk> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When the name_assign_type attribute was introduced (commit 685343fc3ba6, "net: add name_assign_type netdev attribute"), the loopback device was explicitly mentioned as one which would make use of NET_NAME_PREDICTABLE: The name_assign_type attribute gives hints where the interface name of a given net-device comes from. These values are currently defined: ... NET_NAME_PREDICTABLE: The ifname has been assigned by the kernel in a predictable way that is guaranteed to avoid reuse and always be the same for a given device. Examples include statically created devices like the loopback device [...] Switch to that so that reading /sys/class/net/lo/name_assign_type produces something sensible instead of returning -EINVAL. Signed-off-by: Rasmus Villemoes --- This is mostly cosmetic, but ideally I'd like to get to a situation where I don't need to do assign_type=$(cat /sys/class/net/$dev/name_assign_type 2> /dev/null || echo 0) or otherwise special-case [ $dev = "lo" ]. As always, there's a small chance that this could cause a regression, but it seems extremely unlikely that anybody relies on /sys/class/net/lo/name_assign_type being unreadable and thus effectively is known to be NET_NAME_UNKNOWN. drivers/net/loopback.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 14e8d04cb434..2e9742952c4e 100644 --- a/drivers/net/loopback.c +++ b/drivers/net/loopback.c @@ -211,7 +211,7 @@ static __net_init int loopback_net_init(struct net *net) int err; err = -ENOMEM; - dev = alloc_netdev(0, "lo", NET_NAME_UNKNOWN, loopback_setup); + dev = alloc_netdev(0, "lo", NET_NAME_PREDICTABLE, loopback_setup); if (!dev) goto out; -- 2.37.2