From patchwork Mon May 16 19:35:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 573343 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 696E4C433F5 for ; Mon, 16 May 2022 19:54:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346590AbiEPTyj (ORCPT ); Mon, 16 May 2022 15:54:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347958AbiEPTwf (ORCPT ); Mon, 16 May 2022 15:52:35 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B48BF45052; Mon, 16 May 2022 12:48:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id 5EC22CE179E; Mon, 16 May 2022 19:48:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 546EFC34100; Mon, 16 May 2022 19:48:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730483; bh=l5l6ScM/whefvarB+02GhvofGH2tor3+qjvLVBObmUs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pGTiLgS1WUCy7GUUUS1XP4+bUxA36YRwtCrloAe2Mlr3gO4WlA7b1IyTWCc/+7ODb X9LXbB+KERelGP7ZnipLjiTYuo7WMbZDkJ8xMNI111Q+FvxN0CzS3kiC5ONEA8xi6I ktfydR7C8M7dzy3GFj244gVpNAq4BpwVpR8LJDWI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vladimir Oltean , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 006/102] net: mscc: ocelot: fix last VCAP IS1/IS2 filter persisting in hardware when deleted Date: Mon, 16 May 2022 21:35:40 +0200 Message-Id: <20220516193624.176861912@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193623.989270214@linuxfoundation.org> References: <20220516193623.989270214@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vladimir Oltean [ Upstream commit 16bbebd35629c93a8c68c6d8d28557e100bcee73 ] ocelot_vcap_filter_del() works by moving the next filters over the current one, and then deleting the last filter by calling vcap_entry_set() with a del_filter which was specially created by memsetting its memory to zeroes. vcap_entry_set() then programs this to the TCAM and action RAM via the cache registers. The problem is that vcap_entry_set() is a dispatch function which looks at del_filter->block_id. But since del_filter is zeroized memory, the block_id is 0, or otherwise said, VCAP_ES0. So practically, what we do is delete the entry at the same TCAM index from VCAP ES0 instead of IS1 or IS2. The code was not always like this. vcap_entry_set() used to simply be is2_entry_set(), and then, the logic used to work. Restore the functionality by populating the block_id of the del_filter based on the VCAP block of the filter that we're deleting. This makes vcap_entry_set() know what to do. Fixes: 1397a2eb52e2 ("net: mscc: ocelot: create TCAM skeleton from tc filter chains") Signed-off-by: Vladimir Oltean Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/mscc/ocelot_vcap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/mscc/ocelot_vcap.c b/drivers/net/ethernet/mscc/ocelot_vcap.c index 99d7376a70a7..f5f513d87642 100644 --- a/drivers/net/ethernet/mscc/ocelot_vcap.c +++ b/drivers/net/ethernet/mscc/ocelot_vcap.c @@ -1192,7 +1192,11 @@ int ocelot_vcap_filter_del(struct ocelot *ocelot, struct ocelot_vcap_filter del_filter; int i, index; + /* Need to inherit the block_id so that vcap_entry_set() + * does not get confused and knows where to install it. + */ memset(&del_filter, 0, sizeof(del_filter)); + del_filter.block_id = filter->block_id; /* Gets index of the filter */ index = ocelot_vcap_block_get_filter_index(block, filter);