From patchwork Sat Mar 20 22:34:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Oltean X-Patchwork-Id: 405787 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 32473C433F7 for ; Sat, 20 Mar 2021 22:37:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1CA0C6146D for ; Sat, 20 Mar 2021 22:37:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230150AbhCTWgP (ORCPT ); Sat, 20 Mar 2021 18:36:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229995AbhCTWfd (ORCPT ); Sat, 20 Mar 2021 18:35:33 -0400 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 473DFC061762; Sat, 20 Mar 2021 15:35:32 -0700 (PDT) Received: by mail-ed1-x536.google.com with SMTP id e7so14915584edu.10; Sat, 20 Mar 2021 15:35:32 -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=rdhnORVBljkLlBmOFb1qXswODCW9VE34U0BQWvSpPzM=; b=cTtvO3vGE5XTHNu6BESTy8ndYfaZyHBiorgventHSX3pCZFcScsk2w6ulodSkp1NYH dP2g6kwMaKfth3O9Zn2xZW4kWvDudH7uUm5g5247qAmXCe3zhXoZeSDRMtJvAZABo3lX fNE9JCYldb026yPQvjAEQuPliK6z9GKjzA07myRMl3KXl2XNFMuLhffEPe0LByWFIO8R ZxWQsL6U+Zi2sVGt8rsSHkiLL7bNXdnTbfX1cPEiSzQc9bzTFbq8grWQqbLe25F8j49C 9taJ+S+l2ilWKEDa5SwQuwVSxCwuCitwvz5dDy5I3QWK3oSPaVSqPhEZPKjFTn3obRrT sYIg== 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=rdhnORVBljkLlBmOFb1qXswODCW9VE34U0BQWvSpPzM=; b=V+bo02rS7zz6M9B4yShx6Igpm01S66rveZ3scZEfmKtqcdWV1gn3v9ny1KTdlBsY6s e8A8Zb9w6Vs+bdDmvcKhxmhe1HDShylnKAHX2+D3VrbJibto4HVVuqPtyr5lNZ1z1FsB pPkax2RGkQm+HVYNAbavoy8MsAqoRswMVTjpugmusnFWRHc4wDJlRY7iM974T1bYswok Da/m7jOkE5TWR/oLkcPZSIdE4laj1ltvZzTqjH800ZqiOUEifJ9gx1HFT77BKHEOK1nz YDnTCPSDR9czfqAe0luRbyka5foQeDJPbctdCaZ6S/lv6LwWw3YPXd4TAtDq3SJ6SQjW mPAg== X-Gm-Message-State: AOAM531ZZRTJe2koxsBJu9RaqrYey0SMTjm7e3ppCXRRqxxLZ9PJsVKU bg11qOIWYbN254KkZy0rP98= X-Google-Smtp-Source: ABdhPJz92p+6UfZgsbFiQbVQTQZEV2GnD4km6Gy6TTwrN5bBt+GbSnz0bHpYZk1OvW4YfVplQJMQCA== X-Received: by 2002:a05:6402:3096:: with SMTP id de22mr17588802edb.141.1616279731061; Sat, 20 Mar 2021 15:35:31 -0700 (PDT) Received: from localhost.localdomain (5-12-16-165.residential.rdsnet.ro. [5.12.16.165]) by smtp.gmail.com with ESMTPSA id n2sm6090850ejl.1.2021.03.20.15.35.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Mar 2021 15:35:30 -0700 (PDT) From: Vladimir Oltean To: Jakub Kicinski , "David S. Miller" Cc: Andrew Lunn , Vivien Didelot , Florian Fainelli , Tobias Waldekranz , Claudiu Manoil , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Roopa Prabhu , Nikolay Aleksandrov , Jiri Pirko , Ido Schimmel , Alexandre Belloni , UNGLinuxDriver@microchip.com, Ivan Vecera , linux-omap@vger.kernel.org, Vladimir Oltean Subject: [PATCH v3 net-next 09/12] net: dsa: replay port and local fdb entries when joining the bridge Date: Sun, 21 Mar 2021 00:34:45 +0200 Message-Id: <20210320223448.2452869-10-olteanv@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210320223448.2452869-1-olteanv@gmail.com> References: <20210320223448.2452869-1-olteanv@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Vladimir Oltean When a DSA port joins a LAG that already had an FDB entry pointing to it: ip link set bond0 master br0 bridge fdb add dev bond0 00:01:02:03:04:05 master static ip link set swp0 master bond0 the DSA port will have no idea that this FDB entry is there, because it missed the switchdev event emitted at its creation. Ido Schimmel pointed this out during a discussion about challenges with switchdev offloading of stacked interfaces between the physical port and the bridge, and recommended to just catch that condition and deny the CHANGEUPPER event: https://lore.kernel.org/netdev/20210210105949.GB287766@shredder.lan/ But in fact, we might need to deal with the hard thing anyway, which is to replay all FDB addresses relevant to this port, because it isn't just static FDB entries, but also local addresses (ones that are not forwarded but terminated by the bridge). There, we can't just say 'oh yeah, there was an upper already so I'm not joining that'. So, similar to the logic for replaying MDB entries, add a function that must be called by individual switchdev drivers and replays local FDB entries as well as ones pointing towards a bridge port. This time, we use the atomic switchdev notifier block, since that's what FDB entries expect for some reason. Reported-by: Ido Schimmel Signed-off-by: Vladimir Oltean --- Changes in v3: Made the br_fdb_replay shim return -EOPNOTSUPP. include/linux/if_bridge.h | 9 +++++++ include/net/switchdev.h | 1 + net/bridge/br_fdb.c | 52 +++++++++++++++++++++++++++++++++++++++ net/dsa/dsa_priv.h | 1 + net/dsa/port.c | 4 +++ net/dsa/slave.c | 2 +- 6 files changed, 68 insertions(+), 1 deletion(-) diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h index f6472969bb44..b564c4486a45 100644 --- a/include/linux/if_bridge.h +++ b/include/linux/if_bridge.h @@ -147,6 +147,8 @@ void br_fdb_clear_offload(const struct net_device *dev, u16 vid); bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag); u8 br_port_get_stp_state(const struct net_device *dev); clock_t br_get_ageing_time(struct net_device *br_dev); +int br_fdb_replay(struct net_device *br_dev, struct net_device *dev, + struct notifier_block *nb); #else static inline struct net_device * br_fdb_find_port(const struct net_device *br_dev, @@ -175,6 +177,13 @@ static inline clock_t br_get_ageing_time(struct net_device *br_dev) { return 0; } + +static inline int br_fdb_replay(struct net_device *br_dev, + struct net_device *dev, + struct notifier_block *nb) +{ + return -EOPNOTSUPP; +} #endif #endif diff --git a/include/net/switchdev.h b/include/net/switchdev.h index b7fc7d0f54e2..7688ec572757 100644 --- a/include/net/switchdev.h +++ b/include/net/switchdev.h @@ -205,6 +205,7 @@ struct switchdev_notifier_info { struct switchdev_notifier_fdb_info { struct switchdev_notifier_info info; /* must be first */ + struct list_head list; const unsigned char *addr; u16 vid; u8 added_by_user:1, diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index b7490237f3fc..49125cc196ac 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -726,6 +726,58 @@ static inline size_t fdb_nlmsg_size(void) + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ } +static int br_fdb_replay_one(struct notifier_block *nb, + struct net_bridge_fdb_entry *fdb, + struct net_device *dev) +{ + struct switchdev_notifier_fdb_info item; + int err; + + item.addr = fdb->key.addr.addr; + item.vid = fdb->key.vlan_id; + item.added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); + item.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags); + item.info.dev = dev; + + err = nb->notifier_call(nb, SWITCHDEV_FDB_ADD_TO_DEVICE, &item); + return notifier_to_errno(err); +} + +int br_fdb_replay(struct net_device *br_dev, struct net_device *dev, + struct notifier_block *nb) +{ + struct net_bridge_fdb_entry *fdb; + struct net_bridge *br; + int err = 0; + + if (!netif_is_bridge_master(br_dev)) + return -EINVAL; + + if (!netif_is_bridge_port(dev)) + return -EINVAL; + + br = netdev_priv(br_dev); + + rcu_read_lock(); + + hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) { + struct net_device *dst_dev; + + dst_dev = fdb->dst ? fdb->dst->dev : br->dev; + if (dst_dev != br_dev && dst_dev != dev) + continue; + + err = br_fdb_replay_one(nb, fdb, dst_dev); + if (err) + break; + } + + rcu_read_unlock(); + + return err; +} +EXPORT_SYMBOL(br_fdb_replay); + static void fdb_notify(struct net_bridge *br, const struct net_bridge_fdb_entry *fdb, int type, bool swdev_notify) diff --git a/net/dsa/dsa_priv.h b/net/dsa/dsa_priv.h index b14c43cb88bb..92282de54230 100644 --- a/net/dsa/dsa_priv.h +++ b/net/dsa/dsa_priv.h @@ -262,6 +262,7 @@ static inline bool dsa_tree_offloads_bridge_port(struct dsa_switch_tree *dst, /* slave.c */ extern const struct dsa_device_ops notag_netdev_ops; +extern struct notifier_block dsa_slave_switchdev_notifier; extern struct notifier_block dsa_slave_switchdev_blocking_notifier; void dsa_slave_mii_bus_init(struct dsa_switch *ds); diff --git a/net/dsa/port.c b/net/dsa/port.c index 3e61e9e6675c..d21a511f1e16 100644 --- a/net/dsa/port.c +++ b/net/dsa/port.c @@ -205,6 +205,10 @@ static int dsa_port_switchdev_sync(struct dsa_port *dp, if (err && err != -EOPNOTSUPP) return err; + err = br_fdb_replay(br, brport_dev, &dsa_slave_switchdev_notifier); + if (err && err != -EOPNOTSUPP) + return err; + return 0; } diff --git a/net/dsa/slave.c b/net/dsa/slave.c index b974d8f84a2e..c51e52418a62 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -2392,7 +2392,7 @@ static struct notifier_block dsa_slave_nb __read_mostly = { .notifier_call = dsa_slave_netdevice_event, }; -static struct notifier_block dsa_slave_switchdev_notifier = { +struct notifier_block dsa_slave_switchdev_notifier = { .notifier_call = dsa_slave_switchdev_event, };