netdev - [PATCH RFC v3 net-next 03/21] net/sched: act_api: add init_ops to struct tc_action

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Date: Thu, 29 Jun 2023 06:45:20 -0400
From: Jamal Hadi Salim <jhs@...atatu.com>
To: netdev@...r.kernel.org
Cc: deb.chatterjee@...el.com,
	anjali.singhai@...el.com,
	namrata.limaye@...el.com,
	tom@...anda.io,
	mleitner@...hat.com,
	Mahesh.Shirshyad@....com,
	Vipin.Jain@....com,
	tomasz.osinski@...el.com,
	jiri@...nulli.us,
	xiyou.wangcong@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	vladbu@...dia.com,
	simon.horman@...igine.com,
	khalidm@...dia.com,
	toke@...hat.com,
	mattyk@...dia.com,
	kernel@...atatu.com,
	john.andy.fingerhut@...el.com
Subject: [PATCH RFC v3 net-next 03/21] net/sched: act_api: add init_ops to struct tc_action_op

The initialisation of P4TC action instances require access to a struct p4tc_act
(which appears in later patches) to help us to retrieve information like the
dynamic action parameters etc. In order to retrieve struct p4tc_act we need the
pipeline name and the action name. Also recall that P4TC action IDs are dynamic
and  are net namespace specific. The init callback from tc_action_ops parameters
had no way of supplying us that information. To solve this issue, we decided to
create a new tc_action_ops callback (init_ops), that provides us with the
tc_action_ops struct which then provides us with the pipeline and action name.
In addition we add a new refcount to struct tc_action_ops called dyn_ref, which
accounts for how many action instances we have of a specific dynamic action.

Co-developed-by: Victor Nogueira <victor@...atatu.com>
Signed-off-by: Victor Nogueira <victor@...atatu.com>
Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
---
 include/net/act_api.h |  6 ++++++
 net/sched/act_api.c   | 14 +++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/include/net/act_api.h b/include/net/act_api.h
index a414c0f94..363f7f8b5 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -108,6 +108,7 @@ struct tc_action_ops {
 	char    kind[ACTNAMSIZ];
 	enum tca_id  id; /* identifier should match kind */
 	unsigned int	net_id;
+	refcount_t dyn_ref;
 	size_t	size;
 	struct module		*owner;
 	int     (*act)(struct sk_buff *, const struct tc_action *,
@@ -119,6 +120,11 @@ struct tc_action_ops {
 			struct nlattr *est, struct tc_action **act,
 			struct tcf_proto *tp,
 			u32 flags, struct netlink_ext_ack *extack);
+	/* This should be merged with the original init action */
+	int     (*init_ops)(struct net *net, struct nlattr *nla,
+			    struct nlattr *est, struct tc_action **act,
+			   struct tcf_proto *tp, struct tc_action_ops *ops,
+			   u32 flags, struct netlink_ext_ack *extack);
 	int     (*walk)(struct net *, struct sk_buff *,
 			struct netlink_callback *, int,
 			const struct tc_action_ops *,
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 420cf2617..6749f8d94 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1007,7 +1007,7 @@ int tcf_register_action(struct tc_action_ops *act,
 	struct tc_action_ops *a;
 	int ret;
 
-	if (!act->act || !act->dump || !act->init)
+	if (!act->act || !act->dump || (!act->init && !act->init_ops))
 		return -EINVAL;
 
 	/* We have to register pernet ops before making the action ops visible,
@@ -1495,8 +1495,16 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
 			}
 		}
 
-		err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
-				userflags.value | flags, extack);
+		/* When we arrive here we guarantee that a_o->init or
+		 * a_o->init_ops exist.
+		 */
+		if (a_o->init)
+			err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp,
+					userflags.value | flags, extack);
+		else
+			err = a_o->init_ops(net, tb[TCA_ACT_OPTIONS], est, &a,
+					    tp, a_o, userflags.value | flags,
+					    extack);
 	} else {
 		err = a_o->init(net, nla, est, &a, tp, userflags.value | flags,
 				extack);
-- 
2.34.1