From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id AE4854A63 for ; Thu, 28 May 2015 10:36:58 +0200 (CEST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 28 May 2015 01:36:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,511,1427785200"; d="scan'208";a="732975529" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by fmsmga002.fm.intel.com with ESMTP; 28 May 2015 01:36:57 -0700 Received: from shecgisg003.sh.intel.com (shecgisg003.sh.intel.com [10.239.29.90]) by shvmail01.sh.intel.com with ESMTP id t4S8at36023855; Thu, 28 May 2015 16:36:55 +0800 Received: from shecgisg003.sh.intel.com (localhost [127.0.0.1]) by shecgisg003.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id t4S8aqi5027561; Thu, 28 May 2015 16:36:54 +0800 Received: (from jingguox@localhost) by shecgisg003.sh.intel.com (8.13.6/8.13.6/Submit) id t4S8aqK5027557; Thu, 28 May 2015 16:36:52 +0800 From: Jingguo Fu To: dts@dpdk.org Date: Thu, 28 May 2015 16:36:48 +0800 Message-Id: <1432802208-27520-2-git-send-email-jingguox.fu@intel.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1432802208-27520-1-git-send-email-jingguox.fu@intel.com> References: <1432802208-27520-1-git-send-email-jingguox.fu@intel.com> Cc: Jingguo Fu Subject: [dts] [DTS][PATCH V2 2/2] scatter: add scatter test plan X-BeenThere: dts@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: test suite reviews and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2015 08:36:59 -0000 Signed-off-by: Jingguo Fu --- test_plans/scatter_test_plan.rst | 119 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 119 insertions(+) create mode 100644 test_plans/scatter_test_plan.rst diff --git a/test_plans/scatter_test_plan.rst b/test_plans/scatter_test_plan.rst new file mode 100644 index 0000000..b1f1299 --- /dev/null +++ b/test_plans/scatter_test_plan.rst @@ -0,0 +1,119 @@ +.. Copyright (c) <2010, 2011>, Intel Corporation + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + + - Neither the name of Intel Corporation nor the names of its + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + OF THE POSSIBILITY OF SUCH DAMAGE. + +================================================= +Support of Scattered Packets by Poll Mode Drivers +================================================= + +The support of scattered packets by Poll Mode Drivers consists in making +it possible to receive and to transmit scattered multi-segments packets +composed of multiple non-contiguous memory buffers. +To enforce the receipt of scattered packets, the DMA rings of port RX queues +must be configured with mbuf data buffers whose size is lower than the maximum +frame length. +The forwarding of scattered input packets naturally enforces the transmission +of scattered packets by PMD transmit functions. + +Configuring the size of mbuf data buffers +========================================= + +The size of mbuf data buffers is configured with the parameter ``--mbuf-size`` +that is supplied in the set of parameters when launching the ``testpmd`` +application. +The default size of the mbuf data buffer is 2048 so that a full 1518-byte +(CRC included) Ethernet frame can be stored in a mono-segment packet. + +Functional Tests of Scattered Packets +===================================== + +Testing the support of scattered packets in Poll Mode Drivers consists in +sending to the test machine packets whose length is greater than the size +of mbuf data buffers used to populate the DMA rings of port RX queues. + +First, the receipt and the transmission of scattered packets must be tested +with the ``CRC stripping`` option enabled, which guarantees that scattered +packets only contain packet data. + +In addition, the support of scattered packets must also be performed with +the ``CRC stripping`` option disabled, to check the special cases of scattered +input packets whose last buffer only contains the whole CRC or part of it. +In such cases, PMD receive functions must free the last buffer when removing +the CRC from the packet before returning it. + +As a whole, the following packet lengths (CRC included) must be tested to +check all packet memory configurations: + +#. packet length < mbuf data buffer size + +#. packet length = mbuf data buffer size + +#. packet length = mbuf data buffer size + 1 + +#. packet length = mbuf data buffer size + 4 + +#. packet length = mbuf data buffer size + 5 + +In cases 1) and 2), the hardware RX engine stores the packet data and the CRC +in a single buffer. +In case 3), the hardware RX engine stores the packet data and the 3 first bytes +of the CRC in the first buffer, and the last byte of the CRC in a second buffer. +In case 4), the hardware RX engine stores all the packet data in the first +buffer, and the CRC in a second buffer. +In case 5), the hardware RX engine stores part of the packet data in the first +buffer, and the last data byte plus the CRC in a second buffer. + +Prerequisites +============= + +Assuming that ports ``0`` and ``1`` of the test target are directly connected +to a Traffic Generator, launch the ``testpmd`` application with the following +arguments:: + + ./build/app/testpmd -cffffff -n 3 -- -i --rxd=1024 --txd=1024 \ + --burst=144 --txpt=32 --txht=8 --txwt=8 --txfreet=0 --rxfreet=64 \ + --mbcache=200 --portmask=0x3 --mbuf-size=1024 + +The -n command is used to select the number of memory channels. It should match +the number of memory channels on that setup. + +Setting the size of the mbuf data buffer to 1024 makes 1025-bytes input packets +(CRC included) and larger packets to be stored in two buffers by the hardware +RX engine. + +Test Case: Mbuf 1024 traffic +============================ + +Start packet forwarding in the ``testpmd`` application with the ``start`` command. +Send 5 packets of lengths (CRC included) 1023, 1024, 1025, 1028, and 1029. +Check that the same amount of frames and bytes are received back by the Traffic +Generator from its port connected to the target's port 1. + -- 2.1.0