DPDK usage discussions
 help / color / mirror / Atom feed
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: mitali <mitaliyada@cse.iitb.ac.in>
Cc: Priyanka <ppnaik@cse.iitb.ac.in>,
	"users@dpdk.org" <users@dpdk.org>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-users] [dpdk-dev] seg fault in InterVM communication using virtio
Date: Thu, 2 Mar 2017 20:23:42 +0800	[thread overview]
Message-ID: <20170302122342.GS18844@yliu-dev.sh.intel.com> (raw)
In-Reply-To: <63560385-2261-7213-9e7c-6acef4d290c7@cse.iitb.ac.in>

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

  reply	other threads:[~2017-03-02 12:25 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-20 10:30 [dpdk-users] " Priyanka
2017-02-22  8:43 ` [dpdk-users] [dpdk-dev] " Yuanhan Liu
2017-02-22  8:55   ` mitali
2017-02-23  6:27     ` Yuanhan Liu
2017-03-01 13:50       ` mitali
2017-03-02 12:23         ` Yuanhan Liu [this message]
2017-03-02 12:32           ` mitali
2017-03-02 12:59             ` Yuanhan Liu
2017-03-02 14:00               ` mitali
2017-03-02 11:13       ` ppnaik

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170302122342.GS18844@yliu-dev.sh.intel.com \
    --to=yuanhan.liu@linux.intel.com \
    --cc=dev@dpdk.org \
    --cc=mitaliyada@cse.iitb.ac.in \
    --cc=ppnaik@cse.iitb.ac.in \
    --cc=users@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).