Re: [dpdk-dev] Packet Cloning

[Padam Jeet Singh <padam.singh@inventum.net>]

Thanks Marc, Matt, Kyle, and Stephen for your inputs!

I have a possibly good solution of splitting the mbuf into parts to correctly mirror to multiple interfaces, else a fallback of copying the full payload into a new mbuf.

Though the library doesn’t offer a standard method to copy, I can submit a rte_mbuf_copy() patch that does a full deep copy.

Regards,
Padam


> On 28-May-2015, at 9:43 pm, Marc Sune <marc.sune@bisdn.de> wrote:
> 
> 
> 
> On 28/05/15 18:06, Matt Laswell wrote:
>> Hey Kyle,
>> 
>> That's one way you can handle it, though I suspect you'll end up with some
>> complexity elsewhere in your code to deal with remembering whether you
>> should look at the original data or the copied and modified data.  Another
>> way is just to make a copy of the original mbuf, but have your copy API
>> stop after it reaches some particular point.  Perhaps just the L2-L4
>> headers, perhaps a few hundred bytes into payload, or perhaps something
>> else entirely. This all gets very application dependent, of course.  How
>> much is "enough" is going to depend heavily on what you're trying to
>> accomplish.
> 
> mbufs can be chained in multiple segments. So you could first split into two segments leaving the big chunk in the original mbuf (chunk2) and copy chunk1 into the new mbuf (check prepend, adj and trim).
> 
> Marc
> 
> [1] http://dpdk.org/doc/api/rte__mbuf_8h.html
> 
>> 
> 

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