From patchwork Tue Aug 3 12:40:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qingfang Deng X-Patchwork-Id: 12416283 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=-13.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 06B00C4338F for ; Tue, 3 Aug 2021 13:02:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BF25B60F38 for ; Tue, 3 Aug 2021 13:02:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BF25B60F38 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=g3pfmjZwIdOHPJmrto4gvzUEh+Oxfkq3NZUlOugTBKY=; b=CzW2Ip5LjakNWK 86IjRamFM73wRiZ3IhP0C3gsYFAXgCrIkxg5XbMRE2NI9+4WpPAq8h1AeeZPi8XJElWwe1etV0uBG C+VmFrX/GFeB782SQ2TEOMRQL1q6yKXuuZf+wvR/LxDfgCHDhErp2MPNFBQfBH+yF4AEn2IhHVLQz iXoWWsNi8WK0PSRo7gFMe9ewpLsC8oau9pLRMPo6E1ButqkVU37PJV/FZxof90NLDsuGqjm/LthTT VhSEZa6YKOyIr92igYZENVU1xHm+ULykaGZA8rSaS14aqWJ+83sEw0bLUZZRrcKYoFSFrDNeGA7k0 Uskq5CsWw9uGEFn6XPWw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mAu1u-002obz-QA; Tue, 03 Aug 2021 13:00:23 +0000 Received: from mail-pl1-x636.google.com ([2607:f8b0:4864:20::636]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mAtiv-002hR9-3H; Tue, 03 Aug 2021 12:40:47 +0000 Received: by mail-pl1-x636.google.com with SMTP id d1so23584044pll.1; Tue, 03 Aug 2021 05:40:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ZQTX4V0WI9LBN/VZo8OFXaMLg13qufw0P/K3DmG+Ljw=; b=Xua6Fqi4ODcDy6SGOIKu+7JuzGas9cDjMsfmoMKiWm5Vme1IxquAcePzNj0e3oIsfV oCyWoP1iWeEia1yKUqehdMmzCa/TkvUGdhr+okxoTwCYX0neO1BmfOi21zfmTQCyGjpy Qoh/aApzIN+6O/2z8QaAV92Nv/qCHyZkdbfm9yas6HRFvpqOMLDkzCi/WFqJKLnZHW1X zPwVWsdHWjL9coN/2ddVQmxKQri66mj4vafQsLxZJOOCEjBxOxS+CV7tA2/bSTudXG7e VwM3PGH3xxdeCResdYk5I1SMHrCjgwjbZM3GiZ7CfPfndUSYbyGybRGrBjlFuodPt6Vh 5eaQ== 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:content-transfer-encoding; bh=ZQTX4V0WI9LBN/VZo8OFXaMLg13qufw0P/K3DmG+Ljw=; b=Btv4EX9MvEVJuylp8qhxotPF9p5ZWsLss9OB4i2O+iLgYB7PCrdudPe8+AmNyb0MGD /TKKpo7qlXtObKjTlHcK+xSFHiSbSGowWzlioWsHKKMrNJs6alQg/+7Q8k4G2aPwcygl 9+jSEyTOa92s9Omn5zt3DYGzgownqkhA7+HKq3B5ifXg3F+SssRyHNAnt7I7QCwamOCj QIUC0X1R8VItSBpa3lEaFV+LiyEU4Jft31kZY2OsOdNa891FNO4Zb6mYirQTVWCKYzMV IGp/nfWiDi0JuuU2pFzhNNo7W5LsjxaoqAKqOTdqKe3LsMdNxSE/kDcZivK/ONXfucLW cCsw== X-Gm-Message-State: AOAM530Lz9m7FHgjB1ObKczinE5RWPchXzFFmLL5pUR70g9zqeHtHc9S wIxYz1QL6m32LCFaiaOK1pg= X-Google-Smtp-Source: ABdhPJy4rBS3jmbjSutstBBXQ91ohz1aTA16uYC4mz5muRIHNHx3NfcRLnbYX5N5X7VVBVwA82CSFw== X-Received: by 2002:a63:2585:: with SMTP id l127mr1687390pgl.318.1627994443525; Tue, 03 Aug 2021 05:40:43 -0700 (PDT) Received: from haswell-ubuntu20.lan ([138.197.212.246]) by smtp.gmail.com with ESMTPSA id g25sm15747499pfk.138.2021.08.03.05.40.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Aug 2021 05:40:43 -0700 (PDT) From: DENG Qingfang To: Sean Wang , Landen Chao , Andrew Lunn , Vivien Didelot , Florian Fainelli , Vladimir Oltean , "David S. Miller" , Jakub Kicinski , Matthias Brugger , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Eric Woudstra , =?utf-8?q?Ren=C3=A9_van_Dorst?= , Frank Wunderlich , Ilya Lipnitskiy Subject: [PATCH net-next 2/4] net: dsa: mt7530: use independent VLAN learning on VLAN-unaware bridges Date: Tue, 3 Aug 2021 20:40:20 +0800 Message-Id: <20210803124022.2912298-3-dqfext@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210803124022.2912298-1-dqfext@gmail.com> References: <20210803124022.2912298-1-dqfext@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210803_054045_256950_4F2FB776 X-CRM114-Status: GOOD ( 30.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Consider the following bridge configuration, where bond0 is not offloaded: +-- br0 --+ / / | \ / / | \ / | | bond0 / | | / \ swp0 swp1 swp2 swp3 swp4 . . . . . . A B C Ideally, when the switch receives a packet from swp3 or swp4, it should forward the packet to the CPU, according to the port matrix and unknown unicast flood settings. But packet loss will happen if the destination address is at one of the offloaded ports (swp0~2). For example, when client C sends a packet to A, the FDB lookup will indicate that it should be forwarded to swp0, but the port matrix of swp3 and swp4 is configured to only allow the CPU to be its destination, so it is dropped. However, this issue does not happen if the bridge is VLAN-aware. That is because VLAN-aware bridges use independent VLAN learning, i.e. use VID for FDB lookup, on offloaded ports. As swp3 and swp4 are not offloaded, shared VLAN learning with default filter ID of 0 is used instead. So the lookup for A with filter ID 0 never hits and the packet can be forwarded to the CPU. In the current code, only two combinations were used to toggle user ports' VLAN awareness: one is PCR.PORT_VLAN set to port matrix mode with PVC.VLAN_ATTR set to transparent port, the other is PCR.PORT_VLAN set to security mode with PVC.VLAN_ATTR set to user port. It turns out that only PVC.VLAN_ATTR contributes to VLAN awareness, and port matrix mode just skips the VLAN table lookup. The reference manual is somehow misleading when describing PORT_VLAN modes. It states that PORT_MEM (VLAN port member) is used for destination if the VLAN table lookup hits, but actually **PORT_MEM & PORT_MATRIX** (bitwise AND of VLAN port member and port matrix) is used instead, which means we can have two or more separate VLAN-aware bridges with the same PVID and traffic won't leak between them. Therefore, to solve this, enable independent VLAN learning with PVID 0 on VLAN-unaware bridges, by setting their PCR.PORT_VLAN to fallback mode, while leaving standalone ports in port matrix mode. The CPU port is always set to fallback mode to serve those bridges. During testing, it is found that FDB lookup with filter ID of 0 will also hit entries with VID 0 even with independent VLAN learning. To avoid that, install all VLANs with filter ID of 1. Signed-off-by: DENG Qingfang Reviewed-by: Vladimir Oltean --- RFC -> v1: no changes. drivers/net/dsa/mt7530.c | 70 ++++++++++++++++++++++++++++------------ drivers/net/dsa/mt7530.h | 4 ++- 2 files changed, 53 insertions(+), 21 deletions(-) diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index abe57b04fc39..12f449a54833 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -1021,6 +1021,10 @@ mt753x_cpu_port_enable(struct dsa_switch *ds, int port) mt7530_write(priv, MT7530_PCR_P(port), PCR_MATRIX(dsa_user_ports(priv->ds))); + /* Set to fallback mode for independent VLAN learning */ + mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, + MT7530_PORT_FALLBACK_MODE); + return 0; } @@ -1229,6 +1233,10 @@ mt7530_port_bridge_join(struct dsa_switch *ds, int port, PCR_MATRIX_MASK, PCR_MATRIX(port_bitmap)); priv->ports[port].pm |= PCR_MATRIX(port_bitmap); + /* Set to fallback mode for independent VLAN learning */ + mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, + MT7530_PORT_FALLBACK_MODE); + mutex_unlock(&priv->reg_mutex); return 0; @@ -1241,16 +1249,21 @@ mt7530_port_set_vlan_unaware(struct dsa_switch *ds, int port) bool all_user_ports_removed = true; int i; - /* When a port is removed from the bridge, the port would be set up - * back to the default as is at initial boot which is a VLAN-unaware - * port. + /* This is called after .port_bridge_leave when leaving a VLAN-aware + * bridge. Don't set standalone ports to fallback mode. */ - mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, - MT7530_PORT_MATRIX_MODE); + if (dsa_to_port(ds, port)->bridge_dev) + mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, + MT7530_PORT_FALLBACK_MODE); + mt7530_rmw(priv, MT7530_PVC_P(port), VLAN_ATTR_MASK | PVC_EG_TAG_MASK, VLAN_ATTR(MT7530_VLAN_TRANSPARENT) | PVC_EG_TAG(MT7530_VLAN_EG_CONSISTENT)); + /* Set PVID to 0 */ + mt7530_rmw(priv, MT7530_PPBV1_P(port), G0_PORT_VID_MASK, + G0_PORT_VID_DEF); + for (i = 0; i < MT7530_NUM_PORTS; i++) { if (dsa_is_user_port(ds, i) && dsa_port_is_vlan_filtering(dsa_to_port(ds, i))) { @@ -1276,15 +1289,14 @@ mt7530_port_set_vlan_aware(struct dsa_switch *ds, int port) struct mt7530_priv *priv = ds->priv; /* Trapped into security mode allows packet forwarding through VLAN - * table lookup. CPU port is set to fallback mode to let untagged - * frames pass through. + * table lookup. */ - if (dsa_is_cpu_port(ds, port)) - mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, - MT7530_PORT_FALLBACK_MODE); - else + if (dsa_is_user_port(ds, port)) { mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, MT7530_PORT_SECURITY_MODE); + mt7530_rmw(priv, MT7530_PPBV1_P(port), G0_PORT_VID_MASK, + G0_PORT_VID(priv->ports[port].pvid)); + } /* Set the port as a user port which is to be able to recognize VID * from incoming packets before fetching entry within the VLAN table. @@ -1329,6 +1341,13 @@ mt7530_port_bridge_leave(struct dsa_switch *ds, int port, PCR_MATRIX(BIT(MT7530_CPU_PORT))); priv->ports[port].pm = PCR_MATRIX(BIT(MT7530_CPU_PORT)); + /* When a port is removed from the bridge, the port would be set up + * back to the default as is at initial boot which is a VLAN-unaware + * port. + */ + mt7530_rmw(priv, MT7530_PCR_P(port), PCR_PORT_VLAN_MASK, + MT7530_PORT_MATRIX_MODE); + mutex_unlock(&priv->reg_mutex); } @@ -1511,7 +1530,7 @@ mt7530_hw_vlan_add(struct mt7530_priv *priv, /* Validate the entry with independent learning, create egress tag per * VLAN and joining the port as one of the port members. */ - val = IVL_MAC | VTAG_EN | PORT_MEM(new_members) | VLAN_VALID; + val = IVL_MAC | VTAG_EN | PORT_MEM(new_members) | FID(1) | VLAN_VALID; mt7530_write(priv, MT7530_VAWD1, val); /* Decide whether adding tag or not for those outgoing packets from the @@ -1601,9 +1620,13 @@ mt7530_port_vlan_add(struct dsa_switch *ds, int port, mt7530_hw_vlan_update(priv, vlan->vid, &new_entry, mt7530_hw_vlan_add); if (pvid) { - mt7530_rmw(priv, MT7530_PPBV1_P(port), G0_PORT_VID_MASK, - G0_PORT_VID(vlan->vid)); priv->ports[port].pvid = vlan->vid; + + /* Only configure PVID if VLAN filtering is enabled */ + if (dsa_port_is_vlan_filtering(dsa_to_port(ds, port))) + mt7530_rmw(priv, MT7530_PPBV1_P(port), + G0_PORT_VID_MASK, + G0_PORT_VID(vlan->vid)); } mutex_unlock(&priv->reg_mutex); @@ -1617,11 +1640,9 @@ mt7530_port_vlan_del(struct dsa_switch *ds, int port, { struct mt7530_hw_vlan_entry target_entry; struct mt7530_priv *priv = ds->priv; - u16 pvid; mutex_lock(&priv->reg_mutex); - pvid = priv->ports[port].pvid; mt7530_hw_vlan_entry_init(&target_entry, port, 0); mt7530_hw_vlan_update(priv, vlan->vid, &target_entry, mt7530_hw_vlan_del); @@ -1629,11 +1650,12 @@ mt7530_port_vlan_del(struct dsa_switch *ds, int port, /* PVID is being restored to the default whenever the PVID port * is being removed from the VLAN. */ - if (pvid == vlan->vid) - pvid = G0_PORT_VID_DEF; + if (priv->ports[port].pvid == vlan->vid) { + priv->ports[port].pvid = G0_PORT_VID_DEF; + mt7530_rmw(priv, MT7530_PPBV1_P(port), G0_PORT_VID_MASK, + G0_PORT_VID_DEF); + } - mt7530_rmw(priv, MT7530_PPBV1_P(port), G0_PORT_VID_MASK, pvid); - priv->ports[port].pvid = pvid; mutex_unlock(&priv->reg_mutex); @@ -2126,6 +2148,10 @@ mt7530_setup(struct dsa_switch *ds) return ret; } else { mt7530_port_disable(ds, i); + + /* Set default PVID to 0 on all user ports */ + mt7530_rmw(priv, MT7530_PPBV1_P(i), G0_PORT_VID_MASK, + G0_PORT_VID_DEF); } /* Enable consistent egress tag */ mt7530_rmw(priv, MT7530_PVC_P(i), PVC_EG_TAG_MASK, @@ -2293,6 +2319,10 @@ mt7531_setup(struct dsa_switch *ds) return ret; } else { mt7530_port_disable(ds, i); + + /* Set default PVID to 0 on all user ports */ + mt7530_rmw(priv, MT7530_PPBV1_P(i), G0_PORT_VID_MASK, + G0_PORT_VID_DEF); } /* Enable consistent egress tag */ diff --git a/drivers/net/dsa/mt7530.h b/drivers/net/dsa/mt7530.h index b19b389ff10a..a308886fdebc 100644 --- a/drivers/net/dsa/mt7530.h +++ b/drivers/net/dsa/mt7530.h @@ -148,6 +148,8 @@ enum mt7530_vlan_cmd { #define VTAG_EN BIT(28) /* VLAN Member Control */ #define PORT_MEM(x) (((x) & 0xff) << 16) +/* Filter ID */ +#define FID(x) (((x) & 0x7) << 1) /* VLAN Entry Valid */ #define VLAN_VALID BIT(0) #define PORT_MEM_SHFT 16 @@ -247,7 +249,7 @@ enum mt7530_vlan_port_attr { #define MT7530_PPBV1_P(x) (0x2014 + ((x) * 0x100)) #define G0_PORT_VID(x) (((x) & 0xfff) << 0) #define G0_PORT_VID_MASK G0_PORT_VID(0xfff) -#define G0_PORT_VID_DEF G0_PORT_VID(1) +#define G0_PORT_VID_DEF G0_PORT_VID(0) /* Register for port MAC control register */ #define MT7530_PMCR_P(x) (0x3000 + ((x) * 0x100))