[PATCH 3/8] ethdev: add mbuf dynfield for incomplete IP reassembly

[Akhil Goyal]

Hi Konstantin,
> > > Hardware IP reassembly may be incomplete for multiple reasons like
> > > reassembly timeout reached, duplicate fragments, etc.
> > > To save application cycles to process these packets again, a new
> > > mbuf ol_flag (RTE_MBUF_F_RX_IPREASSEMBLY_INCOMPLETE) is added to
> > > show that the mbuf received is not reassembled properly.
> >
> > If we use dynfiled for data, why not use dynflag for
> > RTE_MBUF_F_RX_IPREASSEMBLY_INCOMPLETE?
> > That way we can avoid introduced hardcoded (always defined) flags for that
> > case.
> 
> I have not looked into using dynflag. Will explore if it can be used.
The intent of adding this feature is to reduce application cycles for IP reassembly.
But if we use dynflag, it will take a lot of cycles to check if dyn flag is set or not.
As I understand, it first need to be looked up in a linked list and then checked.
And this will be checked for each packet even if there is no reassembly involved.