From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp1.iitb.ac.in (smtp1.iitb.ac.in [103.21.127.13]) by dpdk.org (Postfix) with ESMTP id 6385B2BAD for ; Thu, 2 Mar 2017 13:34:47 +0100 (CET) Received: from ldns1.iitb.ac.in (ldns1.iitb.ac.in [10.200.12.1]) by smtp1.iitb.ac.in (Postfix) with SMTP id 36B2D15F for ; Thu, 2 Mar 2017 18:04:46 +0530 (IST) Received: (qmail 28871 invoked by uid 510); 2 Mar 2017 18:04:46 +0530 X-Qmail-Scanner-Diagnostics: from 10.200.1.25 by ldns1 (envelope-from , uid 501) with qmail-scanner-2.11 spamassassin: 3.4.1. mhr: 1.0. {clamdscan: 0.99.2/23153} Clear:RC:1(10.200.1.25):SA:0(0.0/5.6):. Processed in 0.765823 secs; 02 Mar 2017 18:04:46 +0530 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on ldns1.iitb.ac.in X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.6 tests=IITB_ORIG,PROPER_IITB_MSGID, T_RP_MATCHES_RCVD autolearn=disabled version=3.4.1 X-Spam-Pyzor: Reported 0 times. X-Envelope-From: mitaliyada@cse.iitb.ac.in X-Qmail-Scanner-Mime-Attachments: | X-Qmail-Scanner-Zip-Files: | Received: from unknown (HELO ldns1.iitb.ac.in) (10.200.1.25) by ldns1.iitb.ac.in with SMTP; 2 Mar 2017 18:04:45 +0530 Received: from jeeves.cse.iitb.ac.in (miller.cse.iitb.ac.in [10.129.3.1]) by ldns1.iitb.ac.in (Postfix) with ESMTP id 154DD360037; Thu, 2 Mar 2017 18:04:45 +0530 (IST) Received: by jeeves.cse.iitb.ac.in (Postfix, from userid 51934) id F401C8C239A; Thu, 2 Mar 2017 18:04:44 +0530 (IST) Received: from [10.129.2.155] (unknown [10.129.2.155]) (using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by jeeves.cse.iitb.ac.in (Postfix) with ESMTPSA id 431098C2359; Thu, 2 Mar 2017 18:04:44 +0530 (IST) To: Yuanhan Liu References: <58AAC534.7000004@cse.iitb.ac.in> <20170222084323.GP18844@yliu-dev.sh.intel.com> <92b5577b-8c8a-e199-3b65-54323dbea48c@cse.iitb.ac.in> <20170223062714.GX18844@yliu-dev.sh.intel.com> <63560385-2261-7213-9e7c-6acef4d290c7@cse.iitb.ac.in> <20170302122342.GS18844@yliu-dev.sh.intel.com> Cc: Priyanka , "users@dpdk.org" , "dev@dpdk.org" From: mitali Message-ID: <62e0d38c-f443-53f0-84c6-41a0ac47222d@cse.iitb.ac.in> Date: Thu, 2 Mar 2017 18:02:28 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <20170302122342.GS18844@yliu-dev.sh.intel.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Thu, 02 Mar 2017 15:22:22 +0100 Subject: Re: [dpdk-users] [dpdk-dev] seg fault in InterVM communication using virtio X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Mar 2017 12:34:47 -0000 Hi, Ok. But with other PMDs like igb, when we are providing sriov vf to VM and running our client/server dpdk application then there is no issue in communication between VMs. As soon as we use virtio setup for VMs and running same dpdk application, it stops after sending 127 packet and seg fault comes while executing rte_eth_tx_burst(). We are still not clear why with virtio its creating this issue but not with any other PMD. Mitali On Thursday 02 March 2017 05:53 PM, Yuanhan Liu wrote: > On Wed, Mar 01, 2017 at 07:20:37PM +0530, mitali wrote: >> Hi, >> >> We have some doubt regarding virtio front end. As we are running dpdk >> application inside VM with virtio setup, do we need to use virtio specific >> functions like virtio_recv_pkts() and virtio_xmit_pkts() to receive and >> transmit packets, functions for port initialization like >> virtio_dev_queue_setup()? If yes, we are unable to find any application >> which uses these functions. Can you provide us some pointers on examples >> which uses these functions. > If you are running DPDK inside guest (with virtio), then the virtio is > yet another PMD, meaning you should program it with the normal DPDK > ethdev APIs, something like rte_eth_dev_configure, rte_eth_rx/tx_queue_setup, > etc. > > --yliu >> Thanks, >> Mitali >> >> On Thursday 23 February 2017 11:57 AM, Yuanhan Liu wrote: >>> On Wed, Feb 22, 2017 at 02:25:29PM +0530, mitali wrote: >>>> Hi Yuanhan, >>>> >>>> We are using virt-manager to start the VMs. We are attaching the image which >>>> shows the vNIC setup for the VMs. >>>> >>>> We have written our own dpdk application to send and receive UDP packets. The >>>> command we are using is >>>> >>>> ./build/app/dpdkapi -c 1 -- -p 1 where dpdkapi is our application. >>>> >>>> Inside the application we are sending and receiving packets from vNIC using >>>> rte_eth_tx_burst() and rte_eth_rx_burst(). >>>> >>>> At the sender side after 127 packets the application stops and we observe a seg >>>> fault in dmesg. Using the print statements we observed that it faults in >>>> rte_eth_tx_burst(). All the 127 were received at the receiving VM. >>> Would you recompile dpdk with debug info enaled, which could be done by: >>> >>> make ... EXTRA_CFLAGS='-g3 -O0' >>> >>> And run it with gdb then dump the call stack? >>> >>> --yliu