[PATCH v7 1/4] ethdev: add API for mbufs recycle mode

[Morten Brørup]

> From: Feifei Wang [mailto:feifei.wang2 at arm.com]
> Sent: Thursday, 6 July 2023 11.50
> 
> Add 'rte_eth_recycle_rx_queue_info_get' and 'rte_eth_recycle_mbufs'
> APIs to recycle used mbufs from a transmit queue of an Ethernet device,
> and move these mbufs into a mbuf ring for a receive queue of an Ethernet
> device. This can bypass mempool 'put/get' operations hence saving CPU
> cycles.
> 
> For each recycling mbufs, the rte_eth_recycle_mbufs() function performs
> the following operations:
> - Copy used *rte_mbuf* buffer pointers from Tx mbuf ring into Rx mbuf
> ring.
> - Replenish the Rx descriptors with the recycling *rte_mbuf* mbufs freed
> from the Tx mbuf ring.
> 
> Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> Suggested-by: Ruifeng Wang <ruifeng.wang at arm.com>
> Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
> ---

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