From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 518351862A; Tue, 1 Jul 2025 04:30:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751344225; cv=none; b=ZRwE0J8pSfKPuBNC0suyJLF46/oEU8Ytl/aZLru4MQm60mZbhzycbeG2OMYSldC3b91BIIshBjFQH2fa400qoKvGhsZ9e0EET77nBAwq+oKzjUvn7md0I5repuHXGGoe+km0sD9zXqJN00OTk9Eo9+f7Up4KlhYtZqh1XPWGCa4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751344225; c=relaxed/simple; bh=f3TlQ7GiBtQlnc2LsSVmB7Cz32Z2h4SA+nSMFSo0f/E=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Epy4EqIyMZQmNuM+kr/9+eU8n2Q++v3X1ZNN7oc8ZDNMXSaeyaTPP7N+N7fJ/TMg61qW3Irk1p2KtDCrkZdFDCAuCce5xP9IkN1tGeB2pMuwqj1MQSa2zHkHgf35MpdWYjnoZE5kQ5jFrOoyqp3UcSEp3TKC3CWyNBKUAYv49Og= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Hm4wfT0z; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Hm4wfT0z" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1751344223; x=1782880223; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=f3TlQ7GiBtQlnc2LsSVmB7Cz32Z2h4SA+nSMFSo0f/E=; b=Hm4wfT0z5FCPo7k+GW0t0+wBH3WtFyp0iD5Hi4oRQEvoUKlza393zzxt XoZ5jqdd0eNQhcX0O63ypcrjURsKrmQnYx/m297/egCQnmkCJoVw3awxD nONZc15R1zu5lHzix+0wJF4M/aMyltucKtP239Fyyk5o4+E2vfAdZjZQY rQeoD47KF5B+kclpubl26F90HsVt93fRvG+n2cvcteVpkfH+E7fdmCH/c iCXMyA7ibqbSYD9X0Oc2AJyAXHgFPHm9GL+MHMARHCQJjVgaVYfKYjB7Y L2EmJY8v32iOssE3vZ+0wZFvCOga0yYWHbLT65DOp7Ay7WEmqlpLpyJWV A==; X-CSE-ConnectionGUID: MV+DzCFFTDy2sF5BQz6umw== X-CSE-MsgGUID: 1mVU/a4NRC2gVjcNCbDUoQ== X-IronPort-AV: E=McAfee;i="6800,10657,11480"; a="56210209" X-IronPort-AV: E=Sophos;i="6.16,279,1744095600"; d="scan'208";a="56210209" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2025 21:30:22 -0700 X-CSE-ConnectionGUID: xTJoGmNUQei78wJYr+f3hw== X-CSE-MsgGUID: vTlz7qJbQC+wlBuzbiE1dQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,279,1744095600"; d="scan'208";a="177308997" Received: from p12ill20yoongsia.png.intel.com ([10.88.227.38]) by fmviesa002.fm.intel.com with ESMTP; 30 Jun 2025 21:30:17 -0700 From: Song Yoong Siang To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Jonathan Corbet , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Stanislav Fomichev , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next 0/2] Clarify and Enhance XDP Rx Metadata Handling Date: Tue, 1 Jul 2025 12:29:38 +0800 Message-Id: <20250701042940.3272325-1-yoong.siang.song@intel.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch set improves the documentation and selftests for XDP Rx metadata handling. The first patch clarifies the documentation around XDP metadata layout and the use of bpf_xdp_adjust_meta. The second patch enhances the BPF selftests to make XDP metadata handling more robust and portable across different NICs. Prior to this patch set, the user application retrieved the xdp_meta by calculating backward from the data pointer, while the XDP program fill in the xdp_meta by calculating backward from data_meta. This approach will cause mismatch if there is device-reserved metadata. |<---sizeof(xdp_meta)--| | | struct xdp_meta rx_desc->address ^ ^ | | +----------+----------------------+------------+------+ | headroom | custom metadata | reserved | data | +----------+----------------------+------------+------+ ^ ^ ^ | | | struct xdp_meta xdp_buff->data_meta xdp_buff->data | | |<---sizeof(xdp_meta)--| Song Yoong Siang (2): doc: clarify XDP Rx metadata layout and bpf_xdp_adjust_meta usage selftests/bpf: Enhance XDP Rx Metadata Handling Documentation/networking/xdp-rx-metadata.rst | 38 +++++++++++++++++++ .../selftests/bpf/prog_tests/xdp_metadata.c | 2 +- .../selftests/bpf/progs/xdp_hw_metadata.c | 10 ++++- .../selftests/bpf/progs/xdp_metadata.c | 8 +++- tools/testing/selftests/bpf/xdp_hw_metadata.c | 2 +- tools/testing/selftests/bpf/xdp_metadata.h | 7 ++++ 6 files changed, 63 insertions(+), 4 deletions(-) -- 2.34.1