From patchwork Fri Mar 26 10:56:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tobias Waldekranz X-Patchwork-Id: 12166383 X-Patchwork-Delegate: kuba@kernel.org 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C3792C433E5 for ; Fri, 26 Mar 2021 10:58:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A980B619C9 for ; Fri, 26 Mar 2021 10:58:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230163AbhCZK5x (ORCPT ); Fri, 26 Mar 2021 06:57:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230097AbhCZK5e (ORCPT ); Fri, 26 Mar 2021 06:57:34 -0400 Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1588FC0613AA for ; Fri, 26 Mar 2021 03:57:34 -0700 (PDT) Received: by mail-lj1-x22c.google.com with SMTP id z25so6887828lja.3 for ; Fri, 26 Mar 2021 03:57:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=waldekranz-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:organization:content-transfer-encoding; bh=eSlgjT7JFI4Q2bXZn5wbGG87Awrs5ECaXb6x1VVorfo=; b=Df7ojB5kGqg4fEyyEOf9HgFecumUYUsxvhzS588a7D/H7VeuxzOWDgvzO50qgjGf/F G4eyPmfp5WZsXQN2ImksxswRhO2McJfmMwNptXHpvO82PT7GNQTtzHAJGn6aUOaRruYN Cu3b8xaAIf+DwoJwXQNqUhyNPcAfH/GfV17elkm0qguGaiCUCVII+OSDsG2oVo+rhNz3 3g7WVpSF+unQqnQ/GyRxcCvA/m2NUNYu0IAwgj3CEV9bWNVEiDONIdIDa3dvEVTBhF6y ahcg28ujM/tTk4s8pYaYDY7k+mcRO/61Taw9WWDnOpce/GAg6CiKfzTtSq6vX/Q9QxhE 0fOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:organization:content-transfer-encoding; bh=eSlgjT7JFI4Q2bXZn5wbGG87Awrs5ECaXb6x1VVorfo=; b=Rr2ZW8r7gwEaVHRW4r83bHDPogzJI5qIYJvP3gDpXlZqLXgtlxU/DUoohgnRzChFGm vEhvMWXkSfe4dZCSQpIELFjO5IJwWNW4Kl7ifYx6P7SEUO2Jr4DopraaV5BFhWaHjuUv Ajv6jq3hUEuKaqICPolvKMP5F/SMUfCaEmZmXBWfI8fkU4R4kZ57vaC9kgdY3rKjAceV zqHgwonJJoKt6KOg/QIPa5KvHWmLajMwnS0e4yzoEKPmbgiijDlzWcuRFucDMlCO7j+J DgskoHbhDB3RkfPs3U1IYqfoVZR4LzAcefVN4cUD8wzuicU/pRH6su9wisDEgDjXARd0 Fp7A== X-Gm-Message-State: AOAM533WXAecHBGiZBLbfP7hLoFHTtnRSOGC9nYG4EktDxqOqTxZiZUU QoxT91/YZzU/oU99ORTZNFv1Tw== X-Google-Smtp-Source: ABdhPJxVbgxhSJJMaaRRllqvBNNADgm3kXe62UMYMyZJxKfmc1uLOo48M5ml8BdDaeUvclX/F65KmQ== X-Received: by 2002:a2e:9bd0:: with SMTP id w16mr8601431ljj.465.1616756252484; Fri, 26 Mar 2021 03:57:32 -0700 (PDT) Received: from veiron.westermo.com (static-193-12-47-89.cust.tele2.se. [193.12.47.89]) by smtp.gmail.com with ESMTPSA id n23sm832629lfq.121.2021.03.26.03.57.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Mar 2021 03:57:32 -0700 (PDT) From: Tobias Waldekranz To: davem@davemloft.net, kuba@kernel.org Cc: andrew@lunn.ch, vivien.didelot@gmail.com, f.fainelli@gmail.com, olteanv@gmail.com, netdev@vger.kernel.org, robh+dt@kernel.org, devicetree@vger.kernel.org Subject: [PATCH net-next 1/3] net: dsa: mv88e6xxx: Allow dynamic reconfiguration of tag protocol Date: Fri, 26 Mar 2021 11:56:46 +0100 Message-Id: <20210326105648.2492411-2-tobias@waldekranz.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210326105648.2492411-1-tobias@waldekranz.com> References: <20210326105648.2492411-1-tobias@waldekranz.com> MIME-Version: 1.0 Organization: Westermo Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org All devices are capable of using regular DSA tags. Support for Ethertyped DSA tags sort into three categories: 1. No support. Older chips fall into this category. 2. Full support. Datasheet explicitly supports configuring the CPU port to receive FORWARDs with a DSA tag. 3. Undocumented support. Datasheet lists the configuration from category 2 as "reserved for future use", but does empirically behave like a category 2 device. Because there are ethernet controllers that do not handle regular DSA tags in all cases, it is sometimes preferable to rely on the undocumented behavior, as the alternative is a very crippled system. But, in those cases, make sure to log the fact that an undocumented feature has been enabled. Signed-off-by: Tobias Waldekranz --- drivers/net/dsa/mv88e6xxx/chip.c | 41 +++++++++++++++++++++++++++++--- drivers/net/dsa/mv88e6xxx/chip.h | 3 +++ 2 files changed, 41 insertions(+), 3 deletions(-) diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c index 95f07fcd4f85..e7ec883d5f6b 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.c +++ b/drivers/net/dsa/mv88e6xxx/chip.c @@ -2531,10 +2531,10 @@ static int mv88e6xxx_setup_port_mode(struct mv88e6xxx_chip *chip, int port) return mv88e6xxx_set_port_mode_normal(chip, port); /* Setup CPU port mode depending on its supported tag format */ - if (chip->info->tag_protocol == DSA_TAG_PROTO_DSA) + if (chip->tag_protocol == DSA_TAG_PROTO_DSA) return mv88e6xxx_set_port_mode_dsa(chip, port); - if (chip->info->tag_protocol == DSA_TAG_PROTO_EDSA) + if (chip->tag_protocol == DSA_TAG_PROTO_EDSA) return mv88e6xxx_set_port_mode_edsa(chip, port); return -EINVAL; @@ -5564,7 +5564,39 @@ static enum dsa_tag_protocol mv88e6xxx_get_tag_protocol(struct dsa_switch *ds, { struct mv88e6xxx_chip *chip = ds->priv; - return chip->info->tag_protocol; + return chip->tag_protocol; +} + +static int mv88e6xxx_change_tag_protocol(struct dsa_switch *ds, int port, + enum dsa_tag_protocol proto) +{ + struct mv88e6xxx_chip *chip = ds->priv; + enum dsa_tag_protocol old_protocol; + int err; + + switch (proto) { + case DSA_TAG_PROTO_EDSA: + if (chip->info->tag_protocol != DSA_TAG_PROTO_EDSA) + dev_warn(chip->dev, "Relying on undocumented EDSA tagging behavior\n"); + + break; + case DSA_TAG_PROTO_DSA: + break; + default: + return -EPROTONOSUPPORT; + } + + old_protocol = chip->tag_protocol; + chip->tag_protocol = proto; + + mv88e6xxx_reg_lock(chip); + err = mv88e6xxx_setup_port_mode(chip, port); + mv88e6xxx_reg_unlock(chip); + + if (err) + chip->tag_protocol = old_protocol; + + return err; } static int mv88e6xxx_port_mdb_add(struct dsa_switch *ds, int port, @@ -6029,6 +6061,7 @@ static int mv88e6xxx_crosschip_lag_leave(struct dsa_switch *ds, int sw_index, static const struct dsa_switch_ops mv88e6xxx_switch_ops = { .get_tag_protocol = mv88e6xxx_get_tag_protocol, + .change_tag_protocol = mv88e6xxx_change_tag_protocol, .setup = mv88e6xxx_setup, .teardown = mv88e6xxx_teardown, .phylink_validate = mv88e6xxx_validate, @@ -6209,6 +6242,8 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev) if (err) goto out; + chip->tag_protocol = chip->info->tag_protocol; + mv88e6xxx_phy_init(chip); if (chip->info->ops->get_eeprom) { diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h index bce6e0dc8535..96b775f3fda2 100644 --- a/drivers/net/dsa/mv88e6xxx/chip.h +++ b/drivers/net/dsa/mv88e6xxx/chip.h @@ -261,6 +261,9 @@ struct mv88e6xxx_region_priv { struct mv88e6xxx_chip { const struct mv88e6xxx_info *info; + /* Currently configured tagging protocol */ + enum dsa_tag_protocol tag_protocol; + /* The dsa_switch this private structure is related to */ struct dsa_switch *ds;