From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id DCEF6A0542; Thu, 13 Feb 2020 13:18:39 +0100 (CET) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 4F2FA1BFA3; Thu, 13 Feb 2020 13:18:39 +0100 (CET) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 268571BF9A for ; Thu, 13 Feb 2020 13:18:36 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Feb 2020 04:18:36 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,436,1574150400"; d="scan'208";a="238020247" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.20]) ([10.237.221.20]) by orsmga006.jf.intel.com with ESMTP; 13 Feb 2020 04:18:34 -0800 To: Ciara Loftus , dev@dpdk.org Cc: xiaolong.ye@intel.com References: <20200213084914.54755-1-ciara.loftus@intel.com> From: Ferruh Yigit Autocrypt: addr=ferruh.yigit@intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH v4 0/3] AF_XDP PMD Fixes X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 2/13/2020 8:49 AM, Ciara Loftus wrote: > This series introduces some fixes for the zero copy path of the AF_XDP. > In zero copy, the mempool objects are mapped directly into the AF_XDP UMEM. > Below depicts the layout of an object in a mempool. > > +-----+--------+------+------+-----+-------------+ > | mp | struct | mbuf | mbuf | XDP | | > | hdr | rte_ | priv | hr | hr | payload | > | obj | mbuf | | | | | > +-----+--------+------+------+-----+-------------+ > 64 128 * 128 256 * > > <---------------- frame size --------------------> > <---- frame hr -------------> > > 1: net/af_xdp: fix umem frame size & headroom calculations > * The previous frame size calculation incorrectly used > mb_pool->private_data_size and didn't include mb_pool->header_size. Instead > of performing a manual calculation, use the rte_mempool_calc_obj_size API > to determine the frame size. > * The previous frame headroom calculation also incorrectly used > mb_pool->private_data_size and didn't include mb_pool->header_size or the > mbuf priv size. > > 2. net/af_xdp: use correct fill queue addresses > The fill queue addresses should start at the beginning of the mempool > object instead of the beginning of the mbuf. This is because the umem frame > headroom includes the mp hdrobj size. Starting at this point ensures AF_XDP > doesn't write past the available room in the frame, in the case of larger > packets which are close to the size of the mbuf. > > 3. net/af_xdp: fix maximum MTU value > The maximum MTU for af_xdp zero copy is equal to the page size less the > frame overhead introduced by AF_XDP (XDP HR = 256) and DPDK (frame hr = > 320). The patch updates this value to reflect this, and removes some > unneeded constants for both zero-copy and copy mode. > > v4: > * Deduct XDP_PACKET_HEADROOM from max mtu for copy mode. > > v3: > * Fix send-email issue - use in-reply-to > > v2: > * Include mbuf priv size in rx mbuf data_off calculation > > Ciara Loftus (3): > net/af_xdp: fix umem frame size & headroom calculations > net/af_xdp: use correct fill queue addresses > net/af_xdp: fix maximum MTU value > Series applied to dpdk-next-net/master, thanks.