netdev - [PATCH net-next RFC 05/20] net/sched: act_api: introduce tc_lookup_action

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Date:   Tue, 24 Jan 2023 12:04:55 -0500
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     netdev@...r.kernel.org
Cc:     kernel@...atatu.com, deb.chatterjee@...el.com,
        anjali.singhai@...el.com, namrata.limaye@...el.com,
        khalidm@...dia.com, tom@...anda.io, pratyush@...anda.io,
        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
Subject: [PATCH net-next RFC 05/20] net/sched: act_api: introduce tc_lookup_action_byid()

Introduce a lookup helper to retrieve the tc_action_ops
instance given its action id.

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 |  1 +
 net/sched/act_api.c   | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/net/act_api.h b/include/net/act_api.h
index 64dc75ba6..083557e51 100644
--- a/include/net/act_api.h
+++ b/include/net/act_api.h
@@ -204,6 +204,7 @@ int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index,
 int tcf_idr_release(struct tc_action *a, bool bind);
 
 int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops);
+struct tc_action_ops *tc_lookup_action_byid(u32 act_id);
 int tcf_unregister_action(struct tc_action_ops *a,
 			  struct pernet_operations *ops);
 int tcf_action_destroy(struct tc_action *actions[], int bind);
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 622b8d3c5..c5dca2085 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1020,6 +1020,26 @@ int tcf_unregister_action(struct tc_action_ops *act,
 }
 EXPORT_SYMBOL(tcf_unregister_action);
 
+/* lookup by ID */
+struct tc_action_ops *tc_lookup_action_byid(u32 act_id)
+{
+	struct tc_action_ops *a, *res = NULL;
+
+	if (!act_id)
+		return NULL;
+
+	read_lock(&act_mod_lock);
+
+	a = idr_find(&act_base, act_id);
+	if (a && try_module_get(a->owner))
+		res = a;
+
+	read_unlock(&act_mod_lock);
+
+	return res;
+}
+EXPORT_SYMBOL(tc_lookup_action_byid);
+
 /* lookup by name */
 static struct tc_action_ops *tc_lookup_action_n(char *kind)
 {
-- 
2.34.1