CXGBE PMD rx allocates a new mbuf everytime, which could lead to performance
hit. Instead, do bulk allocation of mbufs and re-use them.
Also, simplify the overall rx-handler, and update its logic to fix rx perf.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
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