From: Geliang Tang <tanggeliang@kylinos.cn>

There is no need to add a dedicated address entry type "mptcp_pm_add_entry"
to represent ADD_ADDR addresses. Additional fields for ADD_ADDR addresses
can be added into struct mptcp_pm_addr_entry directly. This makes the path
manager code simpler.

Here "union" can be used to merge struct mptcp_pm_addr_entry and struct
mptcp_pm_add_entry into one. Then all mptcp_pm_add_entry can be replaced by
mptcp_pm_addr_entry.

Although this increases the size of the structure even more, but that's OK
to do so because it is not used in an array.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 net/mptcp/pm_netlink.c | 26 +++++++++-----------------
 net/mptcp/protocol.h   | 20 +++++++++++++++-----
 2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index 00911fae5d88..3f3eaa18ffae 100644
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -18,14 +18,6 @@
 
 static int pm_nl_pernet_id;
 
-struct mptcp_pm_add_entry {
-	struct list_head	list;
-	struct mptcp_addr_info	addr;
-	u8			retrans_times;
-	struct timer_list	add_timer;
-	struct mptcp_sock	*sock;
-};
-
 struct pm_nl_pernet {
 	/* protects pernet updates */
 	spinlock_t		lock;
@@ -257,11 +249,11 @@ bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk)
 	return true;
 }
 
-struct mptcp_pm_add_entry *
+struct mptcp_pm_addr_entry *
 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
 				const struct mptcp_addr_info *addr)
 {
-	struct mptcp_pm_add_entry *entry;
+	struct mptcp_pm_addr_entry *entry;
 
 	lockdep_assert_held(&msk->pm.lock);
 
@@ -275,7 +267,7 @@ mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
 
 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk)
 {
-	struct mptcp_pm_add_entry *entry;
+	struct mptcp_pm_addr_entry *entry;
 	struct mptcp_addr_info saddr;
 	bool ret = false;
 
@@ -296,7 +288,7 @@ bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk)
 
 static void mptcp_pm_add_timer(struct timer_list *timer)
 {
-	struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer);
+	struct mptcp_pm_addr_entry *entry = from_timer(entry, timer, add_timer);
 	struct mptcp_sock *msk = entry->sock;
 	struct sock *sk = (struct sock *)msk;
 
@@ -338,11 +330,11 @@ static void mptcp_pm_add_timer(struct timer_list *timer)
 	__sock_put(sk);
 }
 
-struct mptcp_pm_add_entry *
+struct mptcp_pm_addr_entry *
 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 		       const struct mptcp_addr_info *addr, bool check_id)
 {
-	struct mptcp_pm_add_entry *entry;
+	struct mptcp_pm_addr_entry *entry;
 	struct sock *sk = (struct sock *)msk;
 	struct timer_list *add_timer = NULL;
 
@@ -366,7 +358,7 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 			      const struct mptcp_addr_info *addr)
 {
-	struct mptcp_pm_add_entry *add_entry = NULL;
+	struct mptcp_pm_addr_entry *add_entry = NULL;
 	struct sock *sk = (struct sock *)msk;
 	struct net *net = sock_net(sk);
 
@@ -402,7 +394,7 @@ bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 
 void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
 {
-	struct mptcp_pm_add_entry *entry, *tmp;
+	struct mptcp_pm_addr_entry *entry, *tmp;
 	struct sock *sk = (struct sock *)msk;
 	LIST_HEAD(free_list);
 
@@ -1474,7 +1466,7 @@ int mptcp_pm_nl_add_addr_doit(struct sk_buff *skb, struct genl_info *info)
 bool mptcp_remove_anno_list_by_saddr(struct mptcp_sock *msk,
 				     const struct mptcp_addr_info *addr)
 {
-	struct mptcp_pm_add_entry *entry;
+	struct mptcp_pm_addr_entry *entry;
 
 	entry = mptcp_pm_del_add_timer(msk, addr, false);
 	if (entry) {
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 775ac2fd6854..1414e79564c7 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -239,9 +239,19 @@ struct mptcp_pm_data {
 struct mptcp_pm_addr_entry {
 	struct list_head	list;
 	struct mptcp_addr_info	addr;
-	u8			flags;
-	int			ifindex;
-	struct socket		*lsk;
+	union {
+		struct {
+			u8			flags;
+			int			ifindex;
+			struct socket		*lsk;
+		};
+		/* mptcp_pm_add_entry */
+		struct {
+			u8			retrans_times;
+			struct timer_list	add_timer;
+			struct mptcp_sock	*sock;
+		};
+	};
 };
 
 struct mptcp_data_frag {
@@ -1019,10 +1029,10 @@ bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 			      const struct mptcp_addr_info *addr);
 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
-struct mptcp_pm_add_entry *
+struct mptcp_pm_addr_entry *
 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 		       const struct mptcp_addr_info *addr, bool check_id);
-struct mptcp_pm_add_entry *
+struct mptcp_pm_addr_entry *
 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
 				const struct mptcp_addr_info *addr);
 bool mptcp_lookup_subflow_by_saddr(const struct list_head *list,
-- 
2.45.2