From patchwork Tue Oct 16 18:20:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ivan Khoronzhuk X-Patchwork-Id: 10644079 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 257F115E2 for ; Tue, 16 Oct 2018 18:21:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 18E9A2A550 for ; Tue, 16 Oct 2018 18:21:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0D3F62A5E3; Tue, 16 Oct 2018 18:21:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 77DBE2A58C for ; Tue, 16 Oct 2018 18:21:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727275AbeJQCM6 (ORCPT ); Tue, 16 Oct 2018 22:12:58 -0400 Received: from mail-lf1-f67.google.com ([209.85.167.67]:36368 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727315AbeJQCMW (ORCPT ); Tue, 16 Oct 2018 22:12:22 -0400 Received: by mail-lf1-f67.google.com with SMTP id d4-v6so17761594lfa.3 for ; Tue, 16 Oct 2018 11:20:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=UY3go5N1XkoYGbYQ+I2v/woXzZQofslDCysYUjuM+2c=; b=dJH8U1PJ/BNay3RDFioWP26l0qJrNM9u6DCNd1A5aZhrVn5sRESYG4A9S8nG4bHRmR dTGIx9Pt0AEHZ1awjb/erEJo9BxfvPZN/oOY1iAgiFZSYLLkEe2S6Ey+YUFWlNpcsZpC zL8a95KcAvI9rathAbiZ9TYbzYnA5ZCn0CMPI= 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; bh=UY3go5N1XkoYGbYQ+I2v/woXzZQofslDCysYUjuM+2c=; b=QxUXuBoRmfhXTJ8agHlUoZTZG5HX7OM7swvBeNMF375H5UKZiDZBbQU4dBP5W34f8h /5NC+QfSvNdkRYkGZ6U85c6BaKAEfp2e92pGfC27KTF/I8i3t5Y+f+wWgXlXpavnfvm4 OYec2/mltl10xXSr4S2390OcRZ0onbZ/jOzdussVzVN/o8kfxRmXiu+rCKhzq2lBvPtv YCafenFV1TCug0Co8xJCbq9oKO9hdY0r+UrKp/4zNqMcbFKxwVo7wamHsXQ8jMC04opf wvFFm8ZAAoHyptA9pgejn+PnNMU7OLBYz19z0xu/LQoepS95KX0I/qn7U/UQn0gnJEYt IJ1g== X-Gm-Message-State: ABuFfojdGJFFJXUFQQfKK4OAwr25lnfT18EhHBC32ZELz5NiXgNm/3Qo gAMeu9mHAHqOGjq4UpFr2Gq34g== X-Google-Smtp-Source: ACcGV60CZa5GeLtVgVoQw02nFMELO2YxKvKGmva2gzIymsL5pKs3TPXKw9s1rJvCd1abhcWzuxmAwA== X-Received: by 2002:a19:db84:: with SMTP id t4-v6mr7532859lfi.74.1539714039774; Tue, 16 Oct 2018 11:20:39 -0700 (PDT) Received: from localhost.localdomain (59-201-94-178.pool.ukrtel.net. [178.94.201.59]) by smtp.gmail.com with ESMTPSA id i27-v6sm3207844lfc.22.2018.10.16.11.20.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Oct 2018 11:20:38 -0700 (PDT) From: Ivan Khoronzhuk To: grygorii.strashko@ti.com, davem@davemloft.net Cc: linux-omap@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, alexander.h.duyck@intel.com, Ivan Khoronzhuk Subject: [RFC PATCH net-next 1/4] net: core: dev_addr_lists: add auxiliary func to handle reference address updates Date: Tue, 16 Oct 2018 21:20:32 +0300 Message-Id: <20181016182035.18234-2-ivan.khoronzhuk@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181016182035.18234-1-ivan.khoronzhuk@linaro.org> References: <20181016182035.18234-1-ivan.khoronzhuk@linaro.org> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In order to avoid all table update, and only remove or add new address, the auxiliary function exists, named __hw_addr_sync_dev(). It allows end driver do nothing when nothing changed and add/rm when concrete address is firstly added or lastly removed. But it doesn't include cases when an address of real device or vlan was reused by other vlans or vlan/macval devices. For handaling events when address was reused/unreused the patch adds new auxiliary routine - __hw_addr_ref_sync_dev(). It allows to do nothing when nothing was changed and do updates only for an address being added/reused/deleted/unreused. Thus, clone address changes for vlans can be mirrored in the table. The function is exclusive with __hw_addr_sync_dev(). It's responsibility of the end driver to identify address vlan device, if it needs so. Signed-off-by: Ivan Khoronzhuk --- include/linux/netdevice.h | 10 ++++ net/core/dev_addr_lists.c | 97 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index dc1d9ed33b31..de95f96a6352 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4048,6 +4048,16 @@ int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, int (*sync)(struct net_device *, const unsigned char *), int (*unsync)(struct net_device *, const unsigned char *)); +int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*sync)(struct net_device *, + const unsigned char *, int), + int (*unsync)(struct net_device *, + const unsigned char *, int)); +void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*unsync)(struct net_device *, + const unsigned char *, int)); void __hw_addr_unsync_dev(struct netdev_hw_addr_list *list, struct net_device *dev, int (*unsync)(struct net_device *, diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c index d884d8f5f0e5..1385d75fe5ea 100644 --- a/net/core/dev_addr_lists.c +++ b/net/core/dev_addr_lists.c @@ -277,6 +277,103 @@ int __hw_addr_sync_dev(struct netdev_hw_addr_list *list, } EXPORT_SYMBOL(__hw_addr_sync_dev); +/** + * __hw_addr_ref_sync_dev - Synchronize device's multicast address list taking + * into account references + * @list: address list to synchronize + * @dev: device to sync + * @sync: function to call if address or reference on it should be added + * @unsync: function to call if address or some reference on it should removed + * + * This function is intended to be called from the ndo_set_rx_mode + * function of devices that require explicit address or references on it + * add/remove notifications. The unsync function may be NULL in which case + * the addresses or references on it requiring removal will simply be + * removed without any notification to the device. That is responsibility of + * the driver to identify and distribute address or references on it between + * internal address tables. + **/ +int __hw_addr_ref_sync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*sync)(struct net_device *, + const unsigned char *, int), + int (*unsync)(struct net_device *, + const unsigned char *, int)) +{ + struct netdev_hw_addr *ha, *tmp; + int err, keep_sync; + + /* first go through and flush out any unsynced/stale entries */ + list_for_each_entry_safe(ha, tmp, &list->list, list) { + /* sync if address is not used */ + if ((ha->sync_cnt << 1) <= ha->refcount) + continue; + + /* if fails defer unsyncing address */ + keep_sync = ha->refcount - ha->sync_cnt; + if (unsync && unsync(dev, ha->addr, keep_sync)) + continue; + + ha->refcount = (keep_sync << 1) + 1; + ha->sync_cnt = keep_sync; + __hw_addr_del_entry(list, ha, false, false); + } + + /* go through and sync updated/new entries to the list */ + list_for_each_entry_safe(ha, tmp, &list->list, list) { + /* sync if address added or reused */ + if ((ha->sync_cnt << 1) >= ha->refcount) + continue; + + keep_sync = ha->refcount - ha->sync_cnt; + err = sync(dev, ha->addr, keep_sync); + if (err) + return err; + + ha->refcount = keep_sync << 1; + ha->sync_cnt = keep_sync; + } + + return 0; +} +EXPORT_SYMBOL(__hw_addr_ref_sync_dev); + +/** + * __hw_addr_ref_unsync_dev - Remove synchronized addresses and references on + * it from device + * @list: address list to remove synchronized addresses (references on it) from + * @dev: device to sync + * @unsync: function to call if address and references on it should be removed + * + * Remove all addresses that were added to the device by + * __hw_addr_ref_sync_dev(). This function is intended to be called from the + * ndo_stop or ndo_open functions on devices that require explicit address (or + * references on it) add/remove notifications. If the unsync function pointer + * is NULL then this function can be used to just reset the sync_cnt for the + * addresses in the list. + **/ +void __hw_addr_ref_unsync_dev(struct netdev_hw_addr_list *list, + struct net_device *dev, + int (*unsync)(struct net_device *, + const unsigned char *, int)) +{ + struct netdev_hw_addr *ha, *tmp; + + list_for_each_entry_safe(ha, tmp, &list->list, list) { + if (!ha->sync_cnt) + continue; + + /* if fails defer unsyncing address */ + if (unsync && unsync(dev, ha->addr, ha->sync_cnt)) + continue; + + ha->refcount -= ha->sync_cnt - 1; + ha->sync_cnt = 0; + __hw_addr_del_entry(list, ha, false, false); + } +} +EXPORT_SYMBOL(__hw_addr_ref_unsync_dev); + /** * __hw_addr_unsync_dev - Remove synchronized addresses from device * @list: address list to remove synchronized addresses from