From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtprelay01.ispgateway.de (smtprelay01.ispgateway.de [80.67.31.24]) by dpdk.org (Postfix) with ESMTP id 8ECEFC3C8 for ; Mon, 20 Jul 2015 11:21:07 +0200 (CEST) Received: from [87.172.134.125] (helo=nb-klaus.allegro) by smtprelay01.ispgateway.de with esmtpsa (TLSv1.2:DHE-RSA-AES128-SHA:128) (Exim 4.84) (envelope-from ) id 1ZH7Fy-0003D8-SR; Mon, 20 Jul 2015 11:21:06 +0200 To: "Lu, Wenzhuo" References: <55A8ED53.8080802@allegro-packets.com> <6A0DE07E22DDAD4C9103DF62FEBC0909CFB378@shsmsx102.ccr.corp.intel.com> From: Klaus Degner Message-ID: <55ACBD82.4000200@allegro-packets.com> Date: Mon, 20 Jul 2015 11:21:06 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.0.1 MIME-Version: 1.0 In-Reply-To: <6A0DE07E22DDAD4C9103DF62FEBC0909CFB378@shsmsx102.ccr.corp.intel.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Df-Sender: a2RAYWxsZWdyby1wYWNrZXRzLmNvbQ== Cc: "dev@dpdk.org" Subject: Re: [dpdk-dev] jumbo frame support for 82583V X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Jul 2015 09:21:07 -0000 Hi Wenzhuo, > Hi Klaus, > >> -----Original Message----- >> From: Klaus Degner [mailto:kd@allegro-packets.com] >> Sent: Friday, July 17, 2015 7:56 PM >> To: Lu, Wenzhuo >> Cc: dev@dpdk.org >> Subject: jumbo frame support for 82583V >> >> Hi Wenzhuo, >> >> We are testing different Intel NICs for DPDK. We have tested the master branch >> with the support for 82583V Intel chip. >> It works very well except that we can only use up to 1518 bytes for maximum >> packet capture. >> We have debugged this and it is restricted in the initialization: >> >> http://dpdk.org/browse/dpdk/tree/drivers/net/e1000/em_ethdev.c#n855 >> >> Without DPDK, the linux driver support and mtu up to 9k and ark.intel reports >> that this chip is jumbo frame capable: >> >> http://ark.intel.com/de/products/41676/Intel-82583V-Gigabit-Ethernet- >> Controller >> >> Is there any specific reason why DPDK cannot use jumbo frames for this NIC ? >> >> Thanks for help ! >> >> Klaus > Sorry, I'm not sure about the history. > According to the datasheet's update log, 82583v doesn't support jumbo frame at first. > I think the reason is the e1000 code is not updated after the datasheet said the jumbo frame is supported. > As I don’t have the NIC on hand, would you like to change the code and have a try. I mean just let > " case e1000_82583" return 9K. Thanks. The DPDK jumbo frame send and receive works for 82583V. We have tested it with 4x 85283V and the setup: Linux send --> DPDK receive --> DPDK send --> Linux receive We could send a 9k packet via this data path and have verified the content of it. I can generate a patch for DPDK if this is enough testing for you. Thanks, Klaus