[PATCH v3] testpmd: add hairpin-map parameter

[Dariusz Sosnowski]

> Subject: [PATCH v3] testpmd: add hairpin-map parameter
> 
> Hairpin offloads packet forwarding between ports.
> Packet is expected on Rx port <rp>, Rx queue <rq> and is delivered to Tx port
> <tp> Tx queue <tq>.
> 
> Testpmd implements a static hairpin configuration scheme.
> The scheme implicitly matches next valid port for given <rp> or <tp>.
> That approach can be used in a single or double port setups only.
> 
> The new parameter allows explicit selection of Rx and Tx ports and queues in
> hairpin configuration.
> The new `hairpin-map` parameter is provided with 5 parameters, separated by
> `:`
> 
> `--hairpin-map=Rx port id:Rx queue:Tx port id:Tx queue:queues number`
> 
> Testpmd operator can provide several `hairpin-map` parameters for different
> hairpin maps.
> Example:
> 
> dpdk-testpmd <EAL params> -- \
>   <testpmd params> \
>   --rxq=2 --txq=2 --hairpinq=2 --hairpin-mode=0x12 \
>   --hairpin-map=0:2:1:2:1 \ # [1]
>   --hairpin-map=0:3:2:2:3   # [2]
> 
> Hairpin map [1] binds Rx port 0, queue 2 with Tx port 1, queue 2.
> Hairpin map [2] binds
>   Rx port 0, queue 3 with Tx port 2, queue 2,
>   Rx port 0, queue 4 with Tx port 2, queue 3,
>   Rx port 0, queue 5 with Tx port 2, queue 4.
> 
> The new `hairpin-map` parameter is optional.
> If omitted, testpmd will create "default" hairpin maps.
> 
> Signed-off-by: Gregory Etelson <getelson at nvidia.com>
Acked-by: Dariusz Sosnowski <dsosnowski at nvidia.com>

Best regards,
Dariusz Sosnowski