Switch rds to use the new hashtable implementation. This reduces the amount of
generic unrelated code in rds.

Signed-off-by: Sasha Levin <redacted>
---
 net/rds/bind.c       |  28 +++++++++-----
 net/rds/connection.c | 102 +++++++++++++++++++++++----------------------------
 2 files changed, 63 insertions(+), 67 deletions(-)

diff --git a/net/rds/bind.c b/net/rds/bind.c
index 637bde5..79d65ce 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c

@@ -36,16 +36,16 @@
 #include <linux/if_arp.h>
 #include <linux/jhash.h>
 #include <linux/ratelimit.h>
+#include <linux/hashtable.h>
 #include "rds.h"
 
-#define BIND_HASH_SIZE 1024
-static struct hlist_head bind_hash_table[BIND_HASH_SIZE];
+#define BIND_HASH_BITS 10
+static DEFINE_HASHTABLE(bind_hash_table, BIND_HASH_BITS);
 static DEFINE_SPINLOCK(rds_bind_lock);
 
-static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port)
+static u32 rds_hash(__be32 addr, __be16 port)
 {
-	return bind_hash_table + (jhash_2words((u32)addr, (u32)port, 0) &
-				  (BIND_HASH_SIZE - 1));
+	return jhash_2words((u32)addr, (u32)port, 0);
 }
 
 static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,

@@ -53,12 +53,12 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port,
 {
 	struct rds_sock *rs;
 	struct hlist_node *node;
-	struct hlist_head *head = hash_to_bucket(addr, port);
+	u32 key = rds_hash(addr, port);
 	u64 cmp;
 	u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port);
 
 	rcu_read_lock();
-	hlist_for_each_entry_rcu(rs, node, head, rs_bound_node) {
+	hash_for_each_possible_rcu(bind_hash_table, rs, node, rs_bound_node, key) {