From patchwork Wed Sep 27 07:51:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Larysa Zaremba X-Patchwork-Id: 13400303 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D61BE1CF8F; Wed, 27 Sep 2023 07:58:28 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65669126; Wed, 27 Sep 2023 00:58:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695801507; x=1727337507; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aNtXipEMNhdayA0zjVI6ZWIXa7v+Ldi7Wvk8uKIoduQ=; b=m1PrNDCz/0zrjqpxL/9dkI1T4lCNsSqSZt433ghuz7sJdymE//tvB3j2 s2wtMj+lI/FC48ujQWOOsN0pwbK9EE6XyklxM+5k+5wZ189QqLBlO9C6Z Y3/6B9NAg5CLFRxa1ZsED8HqHYhW5TWQim2/AeKIen29e4xQy1kJ3TRNc VT0JV7c03S61vz2o+OQ31DEPH88EAY9Ww8xts49hZazD3Pm8GHOByPSg3 AqQdd7K9XcIhwO8ytOne8JPU8DWlVSClZ3DqgQAMS8Anbl3na3cunKi2N CessTvEZLc28nP3NFMD8XRrhDCvGmRCBjnZ4W8aQzA8vWaroE2ASnxBuF w==; X-IronPort-AV: E=McAfee;i="6600,9927,10845"; a="366818159" X-IronPort-AV: E=Sophos;i="6.03,179,1694761200"; d="scan'208";a="366818159" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Sep 2023 00:58:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10845"; a="725714064" X-IronPort-AV: E=Sophos;i="6.03,179,1694761200"; d="scan'208";a="725714064" Received: from irvmail002.ir.intel.com ([10.43.11.120]) by orsmga006.jf.intel.com with ESMTP; 27 Sep 2023 00:58:19 -0700 Received: from lincoln.igk.intel.com (lincoln.igk.intel.com [10.102.21.235]) by irvmail002.ir.intel.com (Postfix) with ESMTP id 977856D51D; Wed, 27 Sep 2023 08:58:17 +0100 (IST) From: Larysa Zaremba To: bpf@vger.kernel.org Cc: Larysa Zaremba , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, David Ahern , Jakub Kicinski , Willem de Bruijn , Jesper Dangaard Brouer , Anatoly Burakov , Alexander Lobakin , Magnus Karlsson , Maryam Tahhan , xdp-hints@xdp-project.net, netdev@vger.kernel.org, Willem de Bruijn , Alexei Starovoitov , Simon Horman , Tariq Toukan , Saeed Mahameed , Maciej Fijalkowski , Aleksander Lobakin Subject: [RFC bpf-next v2 16/24] net, xdp: allow metadata > 32 Date: Wed, 27 Sep 2023 09:51:16 +0200 Message-ID: <20230927075124.23941-17-larysa.zaremba@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230927075124.23941-1-larysa.zaremba@intel.com> References: <20230927075124.23941-1-larysa.zaremba@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net X-Patchwork-State: RFC From: Aleksander Lobakin When using XDP hints, metadata sometimes has to be much bigger than 32 bytes. Relax the restriction, allow metadata larger than 32 bytes and make __skb_metadata_differs() work with bigger lengths. Now size of metadata is only limited by the fact it is stored as u8 in skb_shared_info, so maximum possible value is 255. Other important conditions, such as having enough space for xdp_frame building, are already checked in bpf_xdp_adjust_meta(). The requirement of having its length aligned to 4 bytes is still valid. Acked-by: Stanislav Fomichev Signed-off-by: Aleksander Lobakin Signed-off-by: Larysa Zaremba --- include/linux/skbuff.h | 13 ++++++++----- include/net/xdp.h | 7 ++++++- 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 4174c4b82d13..1c647e33abda 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -4232,10 +4232,13 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a, { const void *a = skb_metadata_end(skb_a); const void *b = skb_metadata_end(skb_b); - /* Using more efficient varaiant than plain call to memcmp(). */ -#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 u64 diffs = 0; + if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) || + BITS_PER_LONG != 64) + goto slow; + + /* Using more efficient variant than plain call to memcmp(). */ switch (meta_len) { #define __it(x, op) (x -= sizeof(u##op)) #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op)) @@ -4255,11 +4258,11 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a, fallthrough; case 4: diffs |= __it_diff(a, b, 32); break; + default: +slow: + return memcmp(a - meta_len, b - meta_len, meta_len); } return diffs; -#else - return memcmp(a - meta_len, b - meta_len, meta_len); -#endif } static inline bool skb_metadata_differs(const struct sk_buff *skb_a, diff --git a/include/net/xdp.h b/include/net/xdp.h index 1dba8ab6c6ba..b111ee9c303e 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -369,7 +369,12 @@ xdp_data_meta_unsupported(const struct xdp_buff *xdp) static inline bool xdp_metalen_invalid(unsigned long metalen) { - return (metalen & (sizeof(__u32) - 1)) || (metalen > 32); + typeof(metalen) meta_max; + + meta_max = type_max(typeof_member(struct skb_shared_info, meta_len)); + BUILD_BUG_ON(!__builtin_constant_p(meta_max)); + + return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max; } struct xdp_attachment_info {