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Date: Fri, 10 Jul 2015 14:47:34 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: "Sanford, Robert" <rsanford@akamai.com>
Message-ID: <20150710134734.GA7824@bricha3-MOBL3>
References: <D1C44095.24284%keith.wiles@intel.com>
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Cc: "dev@dpdk.org" <dev@dpdk.org>, "Assaad,
 Sami \(Sami\)" <sami.assaad@alcatel-lucent.com>
Subject: Re: [dpdk-dev] DPDK Port Mirroring
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On Fri, Jul 10, 2015 at 01:46:21PM +0000, Sanford, Robert wrote:
> Silly questions: Why use rte_pktmbuf_clone()? Assuming that one is not
> going to modify the mbuf at all, why not just increment the reference
> count with rte_mbuf_refcnt_update()?
> 
Yep, that should work fine too.

/Bruce
> --
> Thanks,
> Robert
> 
> 
> >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
> >packets.
> >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@intel.com>
> >wrote:
> >
> >>
> >>
> >> On 7/9/15, 12:26 PM, "dev on behalf of Assaad, Sami (Sami)"
> >> <dev-bounces@dpdk.org on behalf of sami.assaad@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.
> >>
> >>
>