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=-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=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 86669C11F66 for ; Mon, 28 Jun 2021 22:01:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6E62261CEF for ; Mon, 28 Jun 2021 22:01:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234921AbhF1WDw (ORCPT ); Mon, 28 Jun 2021 18:03:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52582 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237157AbhF1WDL (ORCPT ); Mon, 28 Jun 2021 18:03:11 -0400 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2599EC061574 for ; Mon, 28 Jun 2021 15:00:44 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id bu12so32605759ejb.0 for ; Mon, 28 Jun 2021 15:00:44 -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=Jem2EutGvuK7ZAi4ooTGiXUOEEFNnBNXpCnfc2RJP6c=; b=LptZCoB8mff7/j/j+TQ7ijHXE5wij1BZwSvlOWsdZEUd2GJBKFlXkvtl0VLM61j2/s 8YdVEgk4QEZrrtKVmZ3MoiOEPtr7N5q5ezJSsMeFIR3Qj1evtutp1AHjtVdkzamLf3qa Yjct1i6Z6U2sYeKEhndczf1r5WLKjXYc+Tj5X2gq1oPwJ+RfOt61erZVSE0gsIsBh+Ss dbsOSbhH+6xVadjZ/FINlv0mskyB277pNdtJkPQbPJcyPYLFNMuThy9iGKY+Ff54DOFa cJVrsArJ7qvKuzj7uE/J3xL3E4O7FLn/o0CUctIlUxP6Z2viGrjRj7pjfgvif2CpTYw6 GWtQ== 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=Jem2EutGvuK7ZAi4ooTGiXUOEEFNnBNXpCnfc2RJP6c=; b=pqUUGFSrawWsO0ANd5j5KxLc/rC+WM57NhHADt9jfGwH5jasIlc5anNlwRYRBq8rUJ XaGeNy5vmGWioXJO92nKyboOdNO9RLxi5UCwF/MWSC4A4xzHve5SWM6lfr3TURSMy8t8 vCtPDWxNcajg1thJwd8IHeXuJ/qxM1JYy776yQ2CpSmYvNWMTjjwaxR15otIUj4fAaKg QJkM0b7V64oVB88mZxoKbFjMGws9EwJGkMgqWuo8vJEW+9C/RxqiPZQXKxyUKhUC2qQw lPYku1+/9uR9mBq8XosNRPn1LSE/itLy7ZqzQXQ+bvW0h0XEYHfaCwUAcKEKZ3mj+R0o PNhQ== X-Gm-Message-State: AOAM531qABzGrYBEdmsGnRGjBRTA6LUa315VyncJCOH71defb3kbgQJi B2D7lBgvnhlQcffWNOli2Aw4DSuqLHk= X-Google-Smtp-Source: ABdhPJx7VPLLIHaVwXpcAiNTYzZjLpS/fAwCmhgNLiKj4qDcICafFOLh4gENGlqndDRvTYwNRs775Q== X-Received: by 2002:a17:907:1610:: with SMTP id hb16mr25935682ejc.147.1624917642589; Mon, 28 Jun 2021 15:00:42 -0700 (PDT) Received: from localhost.localdomain ([188.26.224.68]) by smtp.gmail.com with ESMTPSA id dn7sm10146615edb.29.2021.06.28.15.00.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Jun 2021 15:00:42 -0700 (PDT) From: Vladimir Oltean To: netdev@vger.kernel.org Cc: Andrew Lunn , Florian Fainelli , Vivien Didelot , Jiri Pirko , Ido Schimmel , Tobias Waldekranz , Roopa Prabhu , Nikolay Aleksandrov , Vladimir Oltean Subject: [PATCH v4 net-next 08/14] net: dsa: reference count the FDB addresses at the cross-chip notifier level Date: Tue, 29 Jun 2021 01:00:05 +0300 Message-Id: <20210628220011.1910096-9-olteanv@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210628220011.1910096-1-olteanv@gmail.com> References: <20210628220011.1910096-1-olteanv@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Vladimir Oltean The same concerns expressed for host MDB entries are valid for host FDBs just as well: - in the case of multiple bridges spanning the same switch chip, deleting a host FDB entry that belongs to one bridge will result in breakage to the other bridge - not deleting FDB entries across DSA links means that the switch's hardware tables will eventually run out, given enough wear&tear So do the same thing and introduce reference counting for CPU ports and DSA links using the same data structures as we have for MDB entries. Signed-off-by: Vladimir Oltean --- include/net/dsa.h | 1 + net/dsa/dsa2.c | 6 ++++ net/dsa/switch.c | 88 +++++++++++++++++++++++++++++++++++++++++++---- 3 files changed, 88 insertions(+), 7 deletions(-) diff --git a/include/net/dsa.h b/include/net/dsa.h index 2c50546f9667..33f40c1ec379 100644 --- a/include/net/dsa.h +++ b/include/net/dsa.h @@ -288,6 +288,7 @@ struct dsa_port { /* List of MAC addresses that must be forwarded on this port. * These are only valid on CPU ports and DSA links. */ + struct list_head fdbs; struct list_head mdbs; bool setup; diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index 2035d132682f..185629f27f80 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -348,6 +348,7 @@ static int dsa_port_setup(struct dsa_port *dp) if (dp->setup) return 0; + INIT_LIST_HEAD(&dp->fdbs); INIT_LIST_HEAD(&dp->mdbs); switch (dp->type) { @@ -471,6 +472,11 @@ static void dsa_port_teardown(struct dsa_port *dp) break; } + list_for_each_entry_safe(a, tmp, &dp->fdbs, list) { + list_del(&a->list); + kfree(a); + } + list_for_each_entry_safe(a, tmp, &dp->mdbs, list) { list_del(&a->list); kfree(a); diff --git a/net/dsa/switch.c b/net/dsa/switch.c index af1edb6082df..b872a9c92d3e 100644 --- a/net/dsa/switch.c +++ b/net/dsa/switch.c @@ -256,6 +256,71 @@ static int dsa_switch_do_mdb_del(struct dsa_switch *ds, int port, return 0; } +static int dsa_switch_do_fdb_add(struct dsa_switch *ds, int port, + const unsigned char *addr, u16 vid) +{ + struct dsa_port *dp = dsa_to_port(ds, port); + struct dsa_mac_addr *a; + int err; + + /* No need to bother with refcounting for user ports */ + if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) + return ds->ops->port_fdb_add(ds, port, addr, vid); + + a = dsa_mac_addr_find(&dp->fdbs, addr, vid); + if (a) { + refcount_inc(&a->refcount); + return 0; + } + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + err = ds->ops->port_fdb_add(ds, port, addr, vid); + if (err) { + kfree(a); + return err; + } + + ether_addr_copy(a->addr, addr); + a->vid = vid; + refcount_set(&a->refcount, 1); + list_add_tail(&a->list, &dp->fdbs); + + return 0; +} + +static int dsa_switch_do_fdb_del(struct dsa_switch *ds, int port, + const unsigned char *addr, u16 vid) +{ + struct dsa_port *dp = dsa_to_port(ds, port); + struct dsa_mac_addr *a; + int err; + + /* No need to bother with refcounting for user ports */ + if (!(dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))) + return ds->ops->port_fdb_del(ds, port, addr, vid); + + a = dsa_mac_addr_find(&dp->fdbs, addr, vid); + if (!a) + return -ENOENT; + + if (!refcount_dec_and_test(&a->refcount)) + return 0; + + err = ds->ops->port_fdb_del(ds, port, addr, vid); + if (err) { + refcount_inc(&a->refcount); + return err; + } + + list_del(&a->list); + kfree(a); + + return 0; +} + static int dsa_switch_host_fdb_add(struct dsa_switch *ds, struct dsa_notifier_fdb_info *info) { @@ -268,7 +333,7 @@ static int dsa_switch_host_fdb_add(struct dsa_switch *ds, for (port = 0; port < ds->num_ports; port++) { if (dsa_switch_host_address_match(ds, port, info->sw_index, info->port)) { - err = ds->ops->port_fdb_add(ds, port, info->addr, + err = dsa_switch_do_fdb_add(ds, port, info->addr, info->vid); if (err) break; @@ -281,14 +346,23 @@ static int dsa_switch_host_fdb_add(struct dsa_switch *ds, static int dsa_switch_host_fdb_del(struct dsa_switch *ds, struct dsa_notifier_fdb_info *info) { + int err = 0; + int port; + if (!ds->ops->port_fdb_del) return -EOPNOTSUPP; - if (ds->index == info->sw_index) - return ds->ops->port_fdb_del(ds, info->port, info->addr, - info->vid); + for (port = 0; port < ds->num_ports; port++) { + if (dsa_switch_host_address_match(ds, port, info->sw_index, + info->port)) { + err = dsa_switch_do_fdb_del(ds, port, info->addr, + info->vid); + if (err) + break; + } + } - return 0; + return err; } static int dsa_switch_fdb_add(struct dsa_switch *ds, @@ -299,7 +373,7 @@ static int dsa_switch_fdb_add(struct dsa_switch *ds, if (!ds->ops->port_fdb_add) return -EOPNOTSUPP; - return ds->ops->port_fdb_add(ds, port, info->addr, info->vid); + return dsa_switch_do_fdb_add(ds, port, info->addr, info->vid); } static int dsa_switch_fdb_del(struct dsa_switch *ds, @@ -310,7 +384,7 @@ static int dsa_switch_fdb_del(struct dsa_switch *ds, if (!ds->ops->port_fdb_del) return -EOPNOTSUPP; - return ds->ops->port_fdb_del(ds, port, info->addr, info->vid); + return dsa_switch_do_fdb_del(ds, port, info->addr, info->vid); } static int dsa_switch_hsr_join(struct dsa_switch *ds, -- 2.25.1