mptcp: pm: drop is_kernel in alloc_anno_list

To reduce the path manager's reliance on mptcp_pm_is_userspace()
and mptcp_pm_is_kernel() helpers, this patch drops the check for
mptcp_pm_is_kernel() in the function mptcp_pm_alloc_anno_list().
Instead, add a new parameter "reissue" for this function, pass
"false" to this function in the in-kernel PM while pass "true"
to it in the userspace PM.

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

Author: Geliang Tang

net/mptcp/pm_netlink.c

@@ -358,7 +358,8 @@ 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)
+			      const struct mptcp_addr_info *addr,
+			      bool reissue)
 {
 	struct mptcp_pm_add_entry *add_entry = NULL;
 	struct sock *sk = (struct sock *)msk;
@@ -369,7 +370,7 @@ bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
 	add_entry = mptcp_lookup_anno_list_by_saddr(msk, addr);
 
 	if (add_entry) {
-		if (WARN_ON_ONCE(mptcp_pm_is_kernel(msk)))
+		if (WARN_ON_ONCE(!reissue))
 			return false;
 
 		sk_reset_timer(sk, &add_entry->add_timer,
@@ -595,7 +596,7 @@ static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
 		/* If the alloc fails, we are on memory pressure, not worth
 		 * continuing, and trying to create subflows.
 		 */
-		if (!mptcp_pm_alloc_anno_list(msk, &local.addr))
+		if (!mptcp_pm_alloc_anno_list(msk, &local.addr, false))
 			return;
 
 		__clear_bit(local.addr.id, msk->pm.id_avail_bitmap);

net/mptcp/pm_userspace.c

@@ -232,7 +232,7 @@ int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
 	lock_sock(sk);
 	spin_lock_bh(&msk->pm.lock);
 
-	if (mptcp_pm_alloc_anno_list(msk, &addr_val.addr)) {
+	if (mptcp_pm_alloc_anno_list(msk, &addr_val.addr, true)) {
 		msk->pm.add_addr_signaled++;
 		mptcp_pm_announce_addr(msk, &addr_val.addr, false);
 		mptcp_pm_nl_addr_send_ack(msk);

net/mptcp/protocol.h

@@ -1023,7 +1023,8 @@ int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
 				 struct mptcp_addr_info *rem,
 				 u8 bkup);
 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
-			      const struct mptcp_addr_info *addr);
+			      const struct mptcp_addr_info *addr,
+			      bool reissue);
 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 *