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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9C466105F7A8 for ; Fri, 13 Mar 2026 13:31:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MeQo0CPJIJMydU8RkQeA+jd1TL+DTx6MtFkmSKkGNCs=; b=QG0KevcnKOmiOOrCPZRRDfLD6x JdRpFKxzVltD+SywKalNUJv6dOh48zp2Bx0llFBu+7TsCeC7mlPADt0EEdY+joVGDep7eX53qhYf6 Tw+KL49S6Quga9JY4r2TaSqjRkdllIvMIjuzsjp7AFiZuHCfgWoAiJsZzGRlqxThN9v2C6tgdGl6K y0/sjCJhvDkqQ2zv3z8eDYUUNP+zr6OSTKPzm/WtSnXwGHhsTF1MbmwL4lDWxyfJd7lR90wpoolQn wFP4dq+cuX8X0Ou4/NsJ1Jv97YiL0DZYCXoRo6959cHNxnFS8a6sgZq5k22p7C80wLNQLcvX/u4tl eLPB/+XA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w12br-00000000FNQ-0fg2; Fri, 13 Mar 2026 13:31:23 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w12bp-00000000FNI-2Zfo for linux-arm-kernel@lists.infradead.org; Fri, 13 Mar 2026 13:31:21 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id A83AE60142; Fri, 13 Mar 2026 13:31:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03FCAC19421; Fri, 13 Mar 2026 13:31:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773408680; bh=rjDxboEbN9PBbRfJRIEBNS24aeg6irTXidxj5ateeII=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DWjdx58wOVYhoSoJR4FcnGaavF+YH3YlsFNH428rWhwV0xwvYXeoC869SDVfXZwTV k53lIQ2crmAWyD4Vq2fPYN8YQuTVYH8DI6zS1tR1CzNYAmfob+s2zJlrQWfRulxhd7 hZdlFqRNnD5avftUsauqGZR39Wb3yioCecz+S2tAttstBnRtH+aSno0VoWFHU3Dg++ 2idSw6g9i9+IEUCcxJprhjvWvqrYsAabqzSXznSVLkYGSOZIUi6m308foPG42kniva k8yuh6rGI1K0lbpatLeDoDhHh/jhKLTsd+hg27bIbr28jhSGSzYY1ey74u6ay6kpMo VS9g4dUeIKZKQ== Date: Fri, 13 Mar 2026 13:31:15 +0000 From: Simon Horman To: MD Danish Anwar Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Meghana Malladi , Jacob Keller , linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Roger Quadros Subject: Re: [PATCH net-next v2] net: ti: icssg-prueth: Add HSR multicast FDB port membership management Message-ID: <20260313133115.GY461701@kernel.org> References: <20260311082923.2962937-1-danishanwar@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260311082923.2962937-1-danishanwar@ti.com> 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 On Wed, Mar 11, 2026 at 01:59:23PM +0530, MD Danish Anwar wrote: > In HSR offload mode, multicast addresses can be added via HSR master > (hsr0) or directly to slave ports (eth1/eth2). The FDB must track port > membership: P0 (0x1) for HSR master, P1 (0x2) for slave port 1, and P2 > (0x4) for slave port 2. When the same address is added from multiple > paths, memberships must accumulate. > > Implement a hybrid approach using __dev_mc_sync() callbacks to track > basic add/delete operations, checking netdev_hw_addr->synced to > distinguish HSR-synced addresses from direct additions. Post-process > to handle overlapping memberships by checking refcount: > - refcount=2 with synced=1: HSR only (P0) > - refcount>=3 with synced=1: HSR + direct (P0|P1/P2) > - synced=0 with P0 set: HSR removed, clean up orphaned P0 > > On add operations, accumulate new membership with existing ports. On > delete operations, remove only the specific port and clean up orphaned > P0 bits if needed. > > Add error handling for icssg_fdb_lookup() which can return negative > error codes (e.g., -ETIMEDOUT). On lookup failure in add/delete path, > default to no existing membership. In the post-processing path, skip > the address update to avoid corrupting FDB entries with garbage values. > > VLAN Interface Handling: > Add support for multicast addresses added to VLAN interfaces on the HSR > master (e.g., hsr0.7). These addresses require P0 (HSR master) bit to be > set along with the port bits, since VLAN-tagged packets use separate FDB > entries per VLAN ID. Without P0, the HSR master would not receive > multicast packets on VLAN interfaces. > > Track whether the add/del operation came from a VLAN interface path and > set P0 when in HSR offload mode with VLAN interfaces. Update orphaned P0 > cleanup logic to preserve P0 for VLAN interfaces. > > Signed-off-by: MD Danish Anwar > --- > v1 -> v2: > Added a helper function as suggested by Simon Horman Thanks for the update. Reviewed-by: Simon Horman It is unclear to me why this is marked as Not Applicable in patchwork.