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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A3BCC7EE25 for ; Sun, 30 Apr 2023 05:03:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231169AbjD3FDT (ORCPT ); Sun, 30 Apr 2023 01:03:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229644AbjD3FDR (ORCPT ); Sun, 30 Apr 2023 01:03:17 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F98F19AC; Sat, 29 Apr 2023 22:03:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1682830995; x=1714366995; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=q7SEF4bArk/xxwIRZ987yc+xrZpMH3afDQGaBkiO/LA=; b=EfFc+EaXNGNfs9iV4vt9Ow16OpkrOuxBVu82jt2OApTno4NTjDIllNNt vDWA6ZTBw3LaonwfIHfw0OUHb70RapzPj2tQJHAnyH46gt8n2fJ06ehwK 6VaQk5YMi/dTTH1Fcfhln3vEFNZKL8GsXYMO0FW7+WQ5LGwPSdsbnW/ba yNMCNzE7z3L+c+0IXbJzrx9zimvt7Dx/u8uBguMAbQ6vG2s3gDR6Oh/p3 tFSmxK4whzZNjGX1zgXMK8seNzpKzIK8ItV6+O6akqlW32HNXMu/G8bHj BDB6rrQAdx4lEy6eB31xtA1hIdfRyn8AfLNfn8u0IRxtjFO+7GFzKe3i2 Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10695"; a="411108972" X-IronPort-AV: E=Sophos;i="5.99,238,1677571200"; d="scan'208";a="411108972" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2023 22:03:14 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10695"; a="941652643" X-IronPort-AV: E=Sophos;i="5.99,238,1677571200"; d="scan'208";a="941652643" Received: from naamamex-mobl.ger.corp.intel.com (HELO [10.13.12.36]) ([10.13.12.36]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2023 22:03:08 -0700 Message-ID: <7733369a-c3a6-89d4-fb32-ab2bcdc1def0@linux.intel.com> Date: Sun, 30 Apr 2023 08:03:06 +0300 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Subject: Re: [Intel-wired-lan] [PATCH net 1/1] igc: read before write to SRRCTL register Content-Language: en-US To: Song Yoong Siang , Jesse Brandeburg , Tony Nguyen , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Maciej Fijalkowski , Vedang Patel , Jithu Joseph , Andre Guedes , Jesper Dangaard Brouer , Stanislav Fomichev Cc: xdp-hints@xdp-project.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, intel-wired-lan@lists.osuosl.org, bpf@vger.kernel.org References: <20230413151222.1864307-1-yoong.siang.song@intel.com> From: "naamax.meir" In-Reply-To: <20230413151222.1864307-1-yoong.siang.song@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/13/2023 18:12, Song Yoong Siang wrote: > igc_configure_rx_ring() function will be called as part of XDP program > setup. If Rx hardware timestamp is enabled prio to XDP program setup, > this timestamp enablement will be overwritten when buffer size is > written into SRRCTL register. > > Thus, this commit read the register value before write to SRRCTL > register. This commit is tested by using xdp_hw_metadata bpf selftest > tool. The tool enables Rx hardware timestamp and then attach XDP program > to igc driver. It will display hardware timestamp of UDP packet with > port number 9092. Below are detail of test steps and results. > > Command on DUT: > sudo ./xdp_hw_metadata > > Command on Link Partner: > echo -n skb | nc -u -q1 9092 > > Result before this patch: > skb hwtstamp is not found! > > Result after this patch: > found skb hwtstamp = 1677762212.590696226 > > Fixes: fc9df2a0b520 ("igc: Enable RX via AF_XDP zero-copy") > Cc: # 5.14+ > Signed-off-by: Song Yoong Siang > --- > drivers/net/ethernet/intel/igc/igc_base.h | 7 +++++-- > drivers/net/ethernet/intel/igc/igc_main.c | 5 ++++- > 2 files changed, 9 insertions(+), 3 deletions(-) Tested-by: Naama Meir