netdev - [patch net-next RFC 04/10] net: devlink: add unlocked variants of devlink

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Message-Id: <20220712110511.2834647-5-jiri@resnulli.us>
Date:   Tue, 12 Jul 2022 13:05:05 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        edumazet@...gle.com, mlxsw@...dia.com, idosch@...dia.com,
        saeedm@...dia.com, moshe@...dia.com, tariqt@...dia.com
Subject: [patch net-next RFC 04/10] net: devlink: add unlocked variants of devlink_sb*() functions

From: Jiri Pirko <jiri@...dia.com>

Add unlocked variants of devlink_sb*() functions to be used
in drivers called-in with devlink->lock held.

Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
 include/net/devlink.h |  5 ++++
 net/core/devlink.c    | 54 ++++++++++++++++++++++++++++---------------
 2 files changed, 41 insertions(+), 18 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 86b2b9f466f9..9d340f642ed9 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1579,10 +1579,15 @@ void devlink_linecard_provision_clear(struct devlink_linecard *linecard);
 void devlink_linecard_provision_fail(struct devlink_linecard *linecard);
 void devlink_linecard_activate(struct devlink_linecard *linecard);
 void devlink_linecard_deactivate(struct devlink_linecard *linecard);
+int devl_sb_register(struct devlink *devlink, unsigned int sb_index,
+		     u32 size, u16 ingress_pools_count,
+		     u16 egress_pools_count, u16 ingress_tc_count,
+		     u16 egress_tc_count);
 int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
 			u32 size, u16 ingress_pools_count,
 			u16 egress_pools_count, u16 ingress_tc_count,
 			u16 egress_tc_count);
+void devl_sb_unregister(struct devlink *devlink, unsigned int sb_index);
 void devlink_sb_unregister(struct devlink *devlink, unsigned int sb_index);
 int devlink_dpipe_table_register(struct devlink *devlink,
 				 const char *table_name,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5b89fea9bc9b..b45e9216e913 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -10375,25 +10375,21 @@ void devlink_linecard_deactivate(struct devlink_linecard *linecard)
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_deactivate);
 
-int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
-			u32 size, u16 ingress_pools_count,
-			u16 egress_pools_count, u16 ingress_tc_count,
-			u16 egress_tc_count)
+int devl_sb_register(struct devlink *devlink, unsigned int sb_index,
+		     u32 size, u16 ingress_pools_count,
+		     u16 egress_pools_count, u16 ingress_tc_count,
+		     u16 egress_tc_count)
 {
 	struct devlink_sb *devlink_sb;
-	int err = 0;
 
-	devl_lock(devlink);
-	if (devlink_sb_index_exists(devlink, sb_index)) {
-		err = -EEXIST;
-		goto unlock;
-	}
+	lockdep_assert_held(&devlink->lock);
+
+	if (devlink_sb_index_exists(devlink, sb_index))
+		return -EEXIST;
 
 	devlink_sb = kzalloc(sizeof(*devlink_sb), GFP_KERNEL);
-	if (!devlink_sb) {
-		err = -ENOMEM;
-		goto unlock;
-	}
+	if (!devlink_sb)
+		return -ENOMEM;
 	devlink_sb->index = sb_index;
 	devlink_sb->size = size;
 	devlink_sb->ingress_pools_count = ingress_pools_count;
@@ -10401,23 +10397,45 @@ int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
 	devlink_sb->ingress_tc_count = ingress_tc_count;
 	devlink_sb->egress_tc_count = egress_tc_count;
 	list_add_tail(&devlink_sb->list, &devlink->sb_list);
-unlock:
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devl_sb_register);
+
+int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
+			u32 size, u16 ingress_pools_count,
+			u16 egress_pools_count, u16 ingress_tc_count,
+			u16 egress_tc_count)
+{
+	int err;
+
+	devl_lock(devlink);
+	err = devl_sb_register(devlink, sb_index, size, ingress_pools_count,
+			       egress_pools_count, ingress_tc_count,
+			       egress_tc_count);
 	devl_unlock(devlink);
 	return err;
 }
 EXPORT_SYMBOL_GPL(devlink_sb_register);
 
-void devlink_sb_unregister(struct devlink *devlink, unsigned int sb_index)
+void devl_sb_unregister(struct devlink *devlink, unsigned int sb_index)
 {
 	struct devlink_sb *devlink_sb;
 
-	devl_lock(devlink);
+	lockdep_assert_held(&devlink->lock);
+
 	devlink_sb = devlink_sb_get_by_index(devlink, sb_index);
 	WARN_ON(!devlink_sb);
 	list_del(&devlink_sb->list);
-	devl_unlock(devlink);
 	kfree(devlink_sb);
 }
+EXPORT_SYMBOL_GPL(devl_sb_unregister);
+
+void devlink_sb_unregister(struct devlink *devlink, unsigned int sb_index)
+{
+	devl_lock(devlink);
+	devl_sb_unregister(devlink, sb_index);
+	devl_unlock(devlink);
+}
 EXPORT_SYMBOL_GPL(devlink_sb_unregister);
 
 /**
-- 
2.35.3