Hi ,
I am new to VPP.
I request,if any kind hearted soul can help me understand,the boilerplate code 
in Node.c of a plugin. I want to understand the buffer / frame / next handling 
of frame/next handling of node/prefetch code ,that is under both whileS() as 
below.

If you can point me to any URL or any PDF/DOC,that will help me a lot in 
understanding.

while (n_left_from > 0)
{
u32 n_left_to_next;

vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

while (n_left_from > 0 && n_left_to_next > 0)
{
.....

...
}

If you can point me to any URL or any PDF/DOC,that will help me a lot in 
understanding.
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