Thanks Dave, the link is very useful !

On Sat, Nov 3, 2018 at 2:20 AM Dave Barach (dbarach) <dbar...@cisco.com> wrote:
>
> See also 
> https://fdio-vpp.readthedocs.io/en/latest/gettingstarted/developers/vnet.html#creating-packets-from-scratch
>
> -----Original Message-----
> From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Prashant 
> Upadhyaya
> Sent: Friday, November 2, 2018 12:54 PM
> To: vpp-dev@lists.fd.io
> Subject: [vpp-dev] Regarding vlib_buffer_alloc
>
> Hi,
>
> When I allocate a buffer using the vlib_buffer_alloc, are the fields in the 
> vlib_buffer_t guaranteed to be properly initialized (eg. with all zero 
> values) or is there any obligation on the caller to initialize these because 
> the values may be unpredictable ?
>
> Regards
> -Prashant
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