mptcp: pm: add get_priority() interface

This patch adds get_priority() interface for struct mptcp_sched_ops,
then mptcp_pm_is_backup() can directly invoke get_priority() interface
through "ops" of "msk->pm". Instead of using mptcp_pm_is_userspace()
to check which is_backup() helper to invoke.

Rename
	mptcp_pm_nl_is_backup()/mptcp_userspace_pm_is_backup()
to
	mptcp_pm_kernel_get_priority()/mptcp_pm_userspace_get_priority()

and make them static.

Signed-off-by: Geliang Tang <[email protected]>

Author: Geliang Tang

include/net/mptcp.h

@@ -118,6 +118,8 @@ struct mptcp_sched_ops {
 struct mptcp_pm_ops {
 	int (*get_local_id)(struct mptcp_sock *msk,
 			    struct mptcp_pm_addr_entry *skc);
+	bool (*get_priority)(struct mptcp_sock *msk,
+			     struct mptcp_addr_info *skc);
 
 	char			name[MPTCP_PM_NAME_MAX];
 	struct module		*owner;

net/mptcp/pm.c

@@ -881,10 +881,7 @@ bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc)
 
 	mptcp_local_address((struct sock_common *)skc, &skc_local);
 
-	if (mptcp_pm_is_userspace(msk))
-		return mptcp_userspace_pm_is_backup(msk, &skc_local);
-
-	return mptcp_pm_nl_is_backup(msk, &skc_local);
+	return msk->pm.ops->get_priority(msk, &skc_local);
 }
 
 static void mptcp_pm_subflows_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)

net/mptcp/pm_kernel.c

@@ -722,7 +722,8 @@ static int mptcp_pm_kernel_get_local_id(struct mptcp_sock *msk,
 	return ret;
 }
 
-bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc)
+static bool mptcp_pm_kernel_get_priority(struct mptcp_sock *msk,
+					 struct mptcp_addr_info *skc)
 {
 	struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
 	struct mptcp_pm_addr_entry *entry;
@@ -1418,6 +1419,7 @@ static void mptcp_pm_kernel_init(struct mptcp_sock *msk)
 
 struct mptcp_pm_ops mptcp_pm_kernel = {
 	.get_local_id		= mptcp_pm_kernel_get_local_id,
+	.get_priority		= mptcp_pm_kernel_get_priority,
 	.init			= mptcp_pm_kernel_init,
 	.name			= "kernel",
 	.owner			= THIS_MODULE,

net/mptcp/pm_userspace.c

@@ -145,8 +145,8 @@ static int mptcp_pm_userspace_get_local_id(struct mptcp_sock *msk,
 	return mptcp_userspace_pm_append_new_local_addr(msk, skc, true);
 }
 
-bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk,
-				  struct mptcp_addr_info *skc)
+static bool mptcp_pm_userspace_get_priority(struct mptcp_sock *msk,
+					    struct mptcp_addr_info *skc)
 {
 	struct mptcp_pm_addr_entry *entry;
 	bool backup;
@@ -690,6 +690,7 @@ static void mptcp_pm_userspace_release(struct mptcp_sock *msk)
 
 static struct mptcp_pm_ops mptcp_pm_userspace = {
 	.get_local_id		= mptcp_pm_userspace_get_local_id,
+	.get_priority		= mptcp_pm_userspace_get_priority,
 	.release		= mptcp_pm_userspace_release,
 	.name			= "userspace",
 	.owner			= THIS_MODULE,

net/mptcp/protocol.h

@@ -1138,8 +1138,6 @@ bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
 			     struct mptcp_rm_list *rm_list);
 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
 bool mptcp_pm_is_backup(struct mptcp_sock *msk, struct sock_common *skc);
-bool mptcp_pm_nl_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
-bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
 int mptcp_pm_nl_dump_addr(struct sk_buff *msg,
 			  struct netlink_callback *cb);
 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,