[EXT] [PATCH v2] app/test-crypto-perf: fix segment size for IPsec operation

[Akhil Goyal]

> > Can you explain the calculation for 73 bytes in the code?
> > Will it be sufficient for IPv6?
> No, it will not cover IPv6, As currently only IPv4 test cases are there in the
> app.
> But I guess it covers all the scenario which are supported by the app.
> 73 are the maximum bytes which can be added in
> AES - SHA  algo mode (41 +12 + 20 (including any padding))

Please explain and define macros appropriately so that we know what all is
Covered in 73Bytes. Or why not increase it by RTE_PKTMBUF_HEADROOM.

> 
> But it will also not cover other complex scenario like NAT-T, AH.
> I have verified this change with aes-cbc-hmac-sha1 and aes-gcm algos for
> 64,128,256, 512, 1280 bytes.
> 
>  What's your opinion on this?
> 
I believe using RTE_PKTMBUF_HEADROOM will resolve most of the scenarios.