[RFC PATCH v1] net/i40e: put mempool cache out of API

[Morten Brørup]

> From: Feifei Wang [mailto:feifei.wang2 at arm.com]
> Sent: Monday, 13 June 2022 07.52
> 
> Refer to "i40e_tx_free_bufs_avx512", this patch puts mempool cache
> out of API to free buffers directly. There are two changes different
> with previous version:
> 1. change txep from "i40e_entry" to "i40e_vec_entry"
> 2. put cache out of "mempool_bulk" API to copy buffers into it directly
> 
> Performance Test with l3fwd neon path:
> 		with this patch
> n1sdp:		no perforamnce change
> amper-altra:	+4.0%
> 
> Suggested-by: Konstantin Ananyev <konstantin.v.ananyev at yandex.ru>
> Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
> ---

Once again bypassing the mempool API and copy-pasting internal code from the mempool library to a PMD for performance optimization.

Certainly not happy about it, but it's already done elsewhere, and thus we should not deny it here...

Acked-by: Morten Brørup <mb at smartsharesystems.com>