Re: [dpdk-dev] [PATCH v2] app/testpmd: fix missing set for current forward engine

[Phil Yang <Phil.Yang@arm.com>]

Hi Lijun,

Some comments inline.

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Lijun Ou
> Sent: Wednesday, July 1, 2020 3:43 PM
> To: wenzhuo.lu@intel.com; beilei.xing@intel.com;
> bernard.iremonger@intel.com; ferruh.yigit@intel.com
> Cc: dev@dpdk.org; linuxarm@huawei.com
> Subject: [dpdk-dev] [PATCH v2] app/testpmd: fix missing set for current
> forward engine
>
> When set the forwarding mode of the pkt, it needs to update
> the fwd_eng that it is the member of cur_fwd_config. Otherwise,
> an error will occur when executing the set command and show
> confg fwd.
> the flows as follows:
>    1. ./tespmd -w xxx -l xx -n 4 -- i
>    2. set fwd mac
>       testpmd> set fwd mac
>       Set mac packet forwarding mode
>
>    3. show config fwd
>       testpmd> show config fwd
>       io packet forwarding - ports=1 - cores=1 - streams=8 -...
>       Logical Core 1 (socket 0) forwards packets on 8 streams:

I think we need to stop the running engine then start the new engine to make the configuration work.
The Testpmd can't switch forward engine on runtime. When it is forwarding packets, the standing operating procedures should be:
1. testpmd> set fwd mac
2. testpmd> stop
3. testpmd> start

We can add a patch to document this standing operating procedure.
Or we can refactor the set_pkt_forwarding_mode API to support this feature. I prefer this approach.

>
> When run the 1 ~ 3 step, it should show the packet forwarding is
> mac.
>
> Fixes: af75078fece3 ("first public release")
> Cc: wenzhuo.lu@intel.com
> Cc: beilei.xing@intel.com
> Cc: bernard.iremonger@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Lijun Ou <oulijun@huawei.com>
> ---
> v2:
> -- fix the title
> -- add fixes and Cc
> ---
>  app/test-pmd/config.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
> index a7112c9..ee0e904 100644
> --- a/app/test-pmd/config.c
> +++ b/app/test-pmd/config.c
> @@ -3158,6 +3158,7 @@ set_pkt_forwarding_mode(const char
> *fwd_mode_name)
>         fwd_mode_name,
>         retry_enabled == 0 ? "" : " with retry");
>  cur_fwd_eng = fwd_eng;
> +cur_fwd_config.fwd_eng = fwd_eng;

When you stop and restart the forwarding engine, it overwrites by the old engine.

Thanks,
Phil
>  return;
>  }
>  i++;
> --
> 2.7.4

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