net/cnxk: optimize Rx fast path for security offload

net/cnxk: optimize Rx fast path for security offload

Optimize Rx fast path for security packets by preprocessing
most of the operations such as sa pointer compute,
inner WQE pointer fetch and microcode completion translation
before the pkt is characterized as inbound inline pkt.

Preprocessed info will be discarded if packet is not
found to be security pkt. Also fix fetching of CQ word5
for vector mode. Get ucode completion code from CPT parse
header and RLEN from IP4v/IPv6 decrypted packet as it is
in same 64B cacheline as CPT parse header in most of
the cases. By this method, we avoid accessing an extra
cacheline

Fixes: c062f5726f61 ("net/cnxk: support IP reassembly")
Cc: stable@dpdk.org
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>