kni: optimize Rx burst
kni: optimize Rx burst

The current implementation of rte_kni_rx_burst polls the fifo for buffers.
Irrespective of success or failure, it allocates the mbuf and try to put them into the alloc_q
if the buffers are not added to alloc_q, it frees them.
This waste lots of cpu cycles in allocating and freeing the buffers if alloc_q is full.

The logic has been changed to:
1. Initially allocand add buffer(burstsize) to alloc_q
2. Add buffers to alloc_q only when you are pulling out the buffers.

Signed-off-by: Hemant Agrawal <7123f6a6628a9fc84f20db1d8af7bbec27c94c78@freescale.com>
Reviewed-by: Jay Rolette <f7c58b0a9fb04dc409a0127d2c7f498e5b32ad8a@infiniteio.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk