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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12B35C2D0DB for ; Fri, 24 Jan 2020 11:12:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA67C20663 for ; Fri, 24 Jan 2020 11:12:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864333; bh=oKv8ZiAGJ4jNdEZvOnXSULZyM/gX5lc8fT5d2nEbLHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=nl9FGenBf3DjHZgOGaJcRPSWHPu0iLisO7snmqpE/n/ydi3xq7PMOZSRPsttb2+d6 aYN6HhhC+R9yNhBJQuaQDBk1MrJ9xukOj3vpY0gd0wpLTSS9LCSQI28Uzi1pfWhwrS qudukT2rTgQ7qP7FtAjg2+4mLL9sXjI73cOLisqM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730735AbgAXLMM (ORCPT ); Fri, 24 Jan 2020 06:12:12 -0500 Received: from mail.kernel.org ([198.145.29.99]:48368 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389956AbgAXLMJ (ORCPT ); Fri, 24 Jan 2020 06:12:09 -0500 Received: from localhost (ip-213-127-102-57.ip.prioritytelecom.net [213.127.102.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 38B2120708; Fri, 24 Jan 2020 11:12:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579864328; bh=oKv8ZiAGJ4jNdEZvOnXSULZyM/gX5lc8fT5d2nEbLHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dVzi6AqEwrTzJZm2HDfhEGGxRI+DPtBTp0/vM5DTFqj4B7CVwQ2v5RkSeA93PkPBb V+49vpddjvyzoVd694BqZ3mIRoxnDwxSZB7UF0IMVIQ8Eb2rjV3t8rdl7pkp6yKHwi cQ+juTq2G7FmsDQCB5U96Pb5MIwpm0M6rxpQl2ko= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Russell King , Vivien Didelot , Florian Fainelli , "David S. Miller" , Sasha Levin Subject: [PATCH 4.19 223/639] net: dsa: fix unintended change of bridge interface STP state Date: Fri, 24 Jan 2020 10:26:33 +0100 Message-Id: <20200124093114.848751898@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200124093047.008739095@linuxfoundation.org> References: <20200124093047.008739095@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Russell King [ Upstream commit 9c2054a5cf415a9dc32c91ffde78399955deb571 ] When a DSA port is added to a bridge and brought up, the resulting STP state programmed into the hardware depends on the order that these operations are performed. However, the Linux bridge code believes that the port is in disabled mode. If the DSA port is first added to a bridge and then brought up, it will be in blocking mode. If it is brought up and then added to the bridge, it will be in disabled mode. This difference is caused by DSA always setting the STP mode in dsa_port_enable() whether or not this port is part of a bridge. Since bridge always sets the STP state when the port is added, brought up or taken down, it is unnecessary for us to manipulate the STP state. Apparently, this code was copied from Rocker, and the very next day a similar fix for Rocker was merged but was not propagated to DSA. See e47172ab7e41 ("rocker: put port in FORWADING state after leaving bridge") Fixes: b73adef67765 ("net: dsa: integrate with SWITCHDEV for HW bridging") Signed-off-by: Russell King Reviewed-by: Vivien Didelot Reviewed-by: Florian Fainelli Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/dsa/port.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/net/dsa/port.c b/net/dsa/port.c index ed0595459df13..ea7efc86b9d7c 100644 --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -69,7 +69,6 @@ static void dsa_port_set_state_now(struct dsa_port *dp, u8 state) int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy) { - u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING; struct dsa_switch *ds = dp->ds; int port = dp->index; int err; @@ -80,7 +79,8 @@ int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy) return err; } - dsa_port_set_state_now(dp, stp_state); + if (!dp->bridge_dev) + dsa_port_set_state_now(dp, BR_STATE_FORWARDING); return 0; } @@ -90,7 +90,8 @@ void dsa_port_disable(struct dsa_port *dp, struct phy_device *phy) struct dsa_switch *ds = dp->ds; int port = dp->index; - dsa_port_set_state_now(dp, BR_STATE_DISABLED); + if (!dp->bridge_dev) + dsa_port_set_state_now(dp, BR_STATE_DISABLED); if (ds->ops->port_disable) ds->ops->port_disable(ds, port, phy); -- 2.20.1