[dpdk-dev] DPDK Port Mirroring

Matt Laswell laswell at infiniteio.com
Thu Jul 9 22:27:45 CEST 2015

Keith speaks truth.  If I were going to do what you're describing, I would
do the following:

1. Start with the l2fwd example application.
2. Remove the part where it modifies the ethernet MAC address of received
3. Add a call in to clone mbufs via rte_pktmbuf_clone() and send the cloned
packets out of the port of your choice

As long as you don't need to modify the packets - and if you're mirroring,
you shouldn't - simply cloning received packets and sending them out your
mirror port should get you most of the way there.

On Thu, Jul 9, 2015 at 3:17 PM, Wiles, Keith <keith.wiles at intel.com> wrote:

> On 7/9/15, 12:26 PM, "dev on behalf of Assaad, Sami (Sami)"
> <dev-bounces at dpdk.org on behalf of sami.assaad at alcatel-lucent.com> wrote:
> >Hello,
> >
> >I want to build a DPDK app that is able to port-mirror all ingress
> >traffic from two 10G interfaces.
> >
> >1.       Is it possible in port-mirroring traffic consisting of 450byte
> >packets at 20G without losing more than 5% of traffic?
> >
> >2.       Would you have any performance results due to packet copying?
> Do you need to copy the packet if you increment the reference count you
> can send the packet to both ports without having to copy the packet.
> >
> >3.       Would you have any port mirroring DPDK sample code?
> DPDK does not have port mirroring example, but you could grab the l2fwd or
> l3fwd and modify it to do what you want.
> >
> >Thanks in advance.
> >
> >Best Regards,
> >Sami Assaad.

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