netdev - Re: [PATCH net-next 1/3] flow_offload: allow user to offload tc action to net device

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Date:   Tue, 3 Aug 2021 07:05:52 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Simon Horman <simon.horman@...igine.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        oss-drivers@...igine.com, Baowen Zheng <baowen.zheng@...igine.com>,
        Louis Peens <louis.peens@...igine.com>
Subject: Re: [PATCH net-next 1/3] flow_offload: allow user to offload tc
 action to net device

On 2021-07-22 5:19 a.m., Simon Horman wrote:

Triggered by my observation on 2/3 went back and looked at this again to
see if we have same problem with notification on REPLACE case (I think
we do) but here's another comment:

> +EXPORT_SYMBOL(tcf_action_offload_cmd);
> +
>   /* Returns numbers of initialized actions or negative error. */
>   
>   int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
> @@ -1514,6 +1544,9 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
>   		return ret;
>   	ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
>   
> +	/* offload actions to hardware if possible */
> +	tcf_action_offload_cmd(actions, extack);
> +

Above seems to be unconditional whether hw update is requested or not?
The comment says the right thing ("if possible") but the code
should have checked some sort of skip_sw check?

cheers,
jamal