Mon, Nov 19, 2018 at 02:21:41PM CET, pablo@netfilter.org wrote:

On Mon, Nov 19, 2018 at 01:12:51PM +0100, Jiri Pirko wrote:

quoted

Mon, Nov 19, 2018 at 01:15:11AM CET, pablo@netfilter.org wrote:

quoted

@@ -2567,6 +2575,111 @@ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,

}
EXPORT_SYMBOL(tc_setup_cb_call);

+int tc_setup_flow_action(struct flow_action *flow_action,
+			 const struct tcf_exts *exts)
+{
+	const struct tc_action *act;
+	int num_acts = 0, i, j, k;
+
+	if (!exts)
+		return 0;
+
+	tcf_exts_for_each_action(i, act, exts) {
+		if (is_tcf_pedit(act))
+			num_acts += tcf_pedit_nkeys(act);
+		else
+			num_acts++;
+	}
+	if (!num_acts)
+		return 0;
+
+	if (flow_action_init(flow_action, num_acts) < 0)

This is actually a "alloc" function. And the counterpart is "free".

I can rename it to _alloc() if you prefer.

quoted

How about to allocate the container struct which would have the [0]
trick for the array of action?

You mean turn *keys into keys[0] stub in struct flow_action? This is
embedded into struct tc_cls_flower_offload, I may need to make a
second look but I think it won't fly.

BTW, side note: I will rename keys to "array" given keys is not
semantically appropriate as you mentioned, BTW.

What I suggest is this:

struct flow_actions {
       unsinged int action_count;
       struct flow_action action[0];
};


And then to have 
struct flow_actions *flow_actions_alloc(unsigned int action_count)
{
	return kzalloc(sizeof(struct flow_actions) + sizeof(struct flow_action) * action_count, ..);
}

Something like this.

Thanks!