Re: [dpdk-users] query on m_src buffer in crypto_op buffer

[rajesh kumar <rajeshisbest@yahoo.co.in>]

Hi Pablo,
Thank you for the clarification. So as i understood from you mail we can update either from ethernet header or from ip_header. If included with ethernet header ipdata_offset will be length of ethernet + ip header. if i include only from ip_header then ipdata_offset will be length of ip header alone.  DPDK crypto api will not be touching anything on the ethernet and ip headers.Since in my application code i will getting packet after processing the ethernet header so i want to copy from ipheader.Also after processing from the crypto device we will receive the packet in the same m_src buffer depending on how we updated.Please clarify me of my understanding is correct.
thanks,
Rajesh 

    On Tuesday, January 10, 2017 9:49 PM, "De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com> wrote:
 

 Hi Rajesh,

> -----Original Message-----
> From: users [mailto:users-bounces@dpdk.org] On Behalf Of rajesh kumar
> Sent: Monday, January 09, 2017 7:00 AM
> To: users@dpdk.org
> Subject: [dpdk-users] query on m_src buffer in crypto_op buffer
> 
> Hi All,
> As part of our development crypto frame work we want to make use of
> AES-NI instruction set from Intel i7 boxes for crypto operations. Want to
> know whether m_src under crypto_op buffer which is op->sym->m_src has
> to be pointed to ethernet header or any other header. This is to do
> cryptographic operations on the packet received. From the l2fwd sample
> application i could see this is pointed to ethernet header. Can i copy the
> data from the ipheader and do the crypto operations since ESP data will
> start after this only.Please provide your valuable inputs.

m_src has to point at a mbuf, and then internally, it gets the address of the
start of the packet with rte_pktmbuf_mtod.

Since, L2fwd-crypto app handles IP packets, the start of the packet is the
Ethernet header, but only the payload is intended to be encrypted.
Therefore, op->sym->cipher.data.offset = ipdata_offset, where ipdata_offset
is the length of the Ethernet and IP headers.

So, all you need to do is adjust this offset (and length) for ciphering 
and authentication.

Thanks,
Pablo

> Thanks,Rajesh


   
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From: Sakthivel Subramaniam <sakthivelpvs@gmail.com>
Date: Wed, 11 Jan 2017 09:25:24 +0530
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Subject: [dpdk-users] Regarding Receiving packets from outer world (internet)
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Hi,
I'm new to DPDK and want to use dpdk for my project.
I have basic question about receiving packets using dpdk bound interface
from internet.

Please provide clarity for following questions.
1. How can we receive packets from internet and process the same using DPDK?
2. How to assign IP address for the DPDK ethernet interface ?
3. Is it possible to receive specific protocol packets (ex:MQTT) without IP
address using DPDK?
4. Is it necessary to add TCP/IP stack to dpdk?


--
Thanks & Regards
Sakthivel S