[Patch v2] net/mana: use rte_pktmbuf_alloc_bulk for allocating RX WQEs

[Long Li]

> I think default burst size 32 can be used like below:
> 
> struct rte_mbuf *mbufs[32];
> 
> loop: //use do {} while(); if you prefer n = min(32, count);
> rte_pktmbuf_alloc_bulk(mbufs, n); for (i = 0; i < n; i++)
> 	mana_post_rx_wqe(rxq, mbufs[i]);
> count -= n;
> if (count > 0) goto loop:
> 
> 
> This additional loop doesn't make code very complex (I think not more than
> additional alloc() & free()) and it doesn't waste memory.
> I suggest doing a performance measurement with above change, it may increase
> performance, afterwards if you insist to go with original code, we can do it.
> 

I submitted v4 with your suggestions. The code doesn't end up looking very messy. I measured the same performance with and without the patch.

Thanks,

Long