From nobody Fri Dec 19 17:25:31 2025 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 C08B1EE4996 for ; Tue, 22 Aug 2023 06:53:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233112AbjHVGw7 (ORCPT ); Tue, 22 Aug 2023 02:52:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233147AbjHVGwg (ORCPT ); Tue, 22 Aug 2023 02:52:36 -0400 Received: from todd.t-8ch.de (todd.t-8ch.de [IPv6:2a01:4f8:c010:41de::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 901C719A; Mon, 21 Aug 2023 23:52:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1692687134; bh=tQ1co5z99/X+ABfdWW4NyqVShxtMELNEwRz5sOubfpE=; h=From:Date:Subject:To:Cc:From; b=KlBG6EdUBmsV/rWVVIeJjOIz9NOO973JsdBNQefk05l4BzHNBLfxCr8ood2D2iK5Y Pat+o6CTq+1i+TT8SgeOHpF7lWuPgarmXyVzKnlTQVzFdI7ccB3Zf/IIAsyStooVhH Kxvbnf1/zLgk46MugFfRsUFo/zJvXU/CwuFA7ilA= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Tue, 22 Aug 2023 08:51:57 +0200 Subject: [PATCH net-next] net: generalize calculation of skb extensions length MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20230822-skb_ext-simplify-v1-1-9dd047340ab5@weissschuh.net> X-B4-Tracking: v=1; b=H4sIAAxb5GQC/x2M0QqDMAwAf0XybMClOKy/MmSsNdWg66SR4ZD+u 2WPB3d3gnISVuirExJ/ReUTC9zqCvz8ihOjjIWBGjJNR4S6uCcfO6q8t1XCD81ojWdn23AnKNm WOMjxXz4g8o6x6DDkfAHh7YlnbAAAAA== To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Robert Marko , =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1692687132; l=1521; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=tQ1co5z99/X+ABfdWW4NyqVShxtMELNEwRz5sOubfpE=; b=nB1JA227gd9D7EIQ1Y4lAJ8e2tHkBI33b9Aqdnm3VtiTRNmmo0Qas2OWUuzXM8hPBYtIamIWa V750Wfu0R+sBsZYNOaGf2ry/6DkUIRlF1OqNiKUUDFPD7esPizdVYcc X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Remove the necessity to modify skb_ext_total_length() when new extension types are added. Also reduces the line count a bit. With optimizations enabled the function is folded down to a constant value as before. Signed-off-by: Thomas Wei=C3=9Fschuh --- net/core/skbuff.c | 24 +++++++----------------- 1 file changed, 7 insertions(+), 17 deletions(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index faa6c86da2a5..45707059082f 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4785,23 +4785,13 @@ static const u8 skb_ext_type_len[] =3D { =20 static __always_inline unsigned int skb_ext_total_length(void) { - return SKB_EXT_CHUNKSIZEOF(struct skb_ext) + -#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) - skb_ext_type_len[SKB_EXT_BRIDGE_NF] + -#endif -#ifdef CONFIG_XFRM - skb_ext_type_len[SKB_EXT_SEC_PATH] + -#endif -#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT) - skb_ext_type_len[TC_SKB_EXT] + -#endif -#if IS_ENABLED(CONFIG_MPTCP) - skb_ext_type_len[SKB_EXT_MPTCP] + -#endif -#if IS_ENABLED(CONFIG_MCTP_FLOWS) - skb_ext_type_len[SKB_EXT_MCTP] + -#endif - 0; + unsigned int l =3D SKB_EXT_CHUNKSIZEOF(struct skb_ext); + int i; + + for (i =3D 0; i < ARRAY_SIZE(skb_ext_type_len); i++) + l +=3D skb_ext_type_len[i]; + + return l; } =20 static void skb_extensions_init(void) --- base-commit: 90308679c297ffcbb317c715ef434e9fb3c881dc change-id: 20230822-skb_ext-simplify-3d93ceb95f62 Best regards, --=20 Thomas Wei=C3=9Fschuh