netdev - Re: [PATCH net-next v3 2/9] net/sched: act_pedit, setup offload action for action stats query

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Date:   Mon, 6 Feb 2023 15:17:57 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Oz Shlomo <ozsh@...dia.com>
Cc:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Roi Dayan <roid@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        Marcelo Ricardo Leitner <mleitner@...hat.com>,
        Baowen Zheng <baowen.zheng@...igine.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Edward Cree <ecree.xilinx@...il.com>
Subject: Re: [PATCH  net-next v3 2/9] net/sched: act_pedit, setup offload
 action for action stats query

On Mon, Feb 06, 2023 at 03:54:35PM +0200, Oz Shlomo wrote:
> A single tc pedit action may be translated to multiple flow_offload
> actions.
> Offload only actions that translate to a single pedit command value.
> 
> Signed-off-by: Oz Shlomo <ozsh@...dia.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

> ---
> Change log:
> 
> V1 -> V2:
>     - Add extack message on error
>     - Assign the flow action id outside the for loop.
>       Ensure the rest of the pedit actions follow the assigned id.
> 
> V2 -> V3:
>     - Fix last_cmd initialization
> ---
>  net/sched/act_pedit.c | 27 ++++++++++++++++++++++++++-
>  1 file changed, 26 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
> index c42fcc47dd6d..924beb76f5b7 100644
> --- a/net/sched/act_pedit.c
> +++ b/net/sched/act_pedit.c
> @@ -545,7 +545,32 @@ static int tcf_pedit_offload_act_setup(struct tc_action *act, void *entry_data,
>  		}
>  		*index_inc = k;
>  	} else {
> -		return -EOPNOTSUPP;
> +		struct flow_offload_action *fl_action = entry_data;
> +		u32 cmd = tcf_pedit_cmd(act, 0);
> +		u32 last_cmd;
> +		int k;
> +
> +		switch (cmd) {
> +		case TCA_PEDIT_KEY_EX_CMD_SET:
> +			fl_action->id = FLOW_ACTION_MANGLE;
> +			break;
> +		case TCA_PEDIT_KEY_EX_CMD_ADD:
> +			fl_action->id = FLOW_ACTION_ADD;
> +			break;
> +		default:
> +			NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
> +			return -EOPNOTSUPP;
> +		}
> +
> +		for (k = 1; k < tcf_pedit_nkeys(act); k++) {
> +			last_cmd = cmd;

nit: The declaration of last_cmd could now be in this scope.
     No need to respin for this, IMHO.

> +			cmd = tcf_pedit_cmd(act, k);
> +
> +			if (cmd != last_cmd) {
> +				NL_SET_ERR_MSG_MOD(extack, "Unsupported pedit command offload");
> +				return -EOPNOTSUPP;
> +			}
> +		}
>  	}
>  
>  	return 0;
> -- 
> 1.8.3.1
>