ipmr, ip6mr: Unite creation of new mr_table

Now that both ipmr and ip6mr are using the same mr_table structure,
we can have a common function to allocate & initialize a new instance.
Signed-off-by: Yuval Mintz <yuvalm@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/mroute_base.h

@@ -85,6 +85,13 @@ void vif_device_init(struct vif_device *v,
 		     unsigned char threshold,
 		     unsigned short flags,
 		     unsigned short get_iflink_mask);
+
+struct mr_table *
+mr_table_alloc(struct net *net, u32 id,
+	       const struct rhashtable_params *rht_params,
+	       void (*expire_func)(struct timer_list *t),
+	       void (*table_set)(struct mr_table *mrt,
+				 struct net *net));
 #else
 static inline void vif_device_init(struct vif_device *v,
 				   struct net_device *dev,
@@ -94,5 +101,15 @@ static inline void vif_device_init(struct vif_device *v,
 				   unsigned short get_iflink_mask)
 {
 }
+
+static inline struct mr_table *
+mr_table_alloc(struct net *net, u32 id,
+	       const struct rhashtable_params *rht_params,
+	       void (*expire_func)(struct timer_list *t),
+	       void (*table_set)(struct mr_table *mrt,
+				 struct net *net))
+{
+	return NULL;
+}
 #endif
 #endif

net/ipv4/ipmr.c

@@ -352,6 +352,14 @@ static const struct rhashtable_params ipmr_rht_params = {
 	.automatic_shrinking = true,
 };
 
+static void ipmr_new_table_set(struct mr_table *mrt,
+			       struct net *net)
+{
+#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
+	list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
+#endif
+}
+
 static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 {
 	struct mr_table *mrt;
@@ -364,23 +372,8 @@ static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 	if (mrt)
 		return mrt;
 
-	mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
-	if (!mrt)
-		return ERR_PTR(-ENOMEM);
-	write_pnet(&mrt->net, net);
-	mrt->id = id;
-
-	rhltable_init(&mrt->mfc_hash, &ipmr_rht_params);
-	INIT_LIST_HEAD(&mrt->mfc_cache_list);
-	INIT_LIST_HEAD(&mrt->mfc_unres_queue);
-
-	timer_setup(&mrt->ipmr_expire_timer, ipmr_expire_process, 0);
-
-	mrt->mroute_reg_vif_num = -1;
-#ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES
-	list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables);
-#endif
-	return mrt;
+	return mr_table_alloc(net, id, &ipmr_rht_params,
+			      ipmr_expire_process, ipmr_new_table_set);
 }
 
 static void ipmr_free_table(struct mr_table *mrt)

net/ipv4/ipmr_base.c

@@ -26,3 +26,30 @@ void vif_device_init(struct vif_device *v,
 		v->link = dev->ifindex;
 }
 EXPORT_SYMBOL(vif_device_init);
+
+struct mr_table *
+mr_table_alloc(struct net *net, u32 id,
+	       const struct rhashtable_params *rht_params,
+	       void (*expire_func)(struct timer_list *t),
+	       void (*table_set)(struct mr_table *mrt,
+				 struct net *net))
+{
+	struct mr_table *mrt;
+
+	mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
+	if (!mrt)
+		return NULL;
+	mrt->id = id;
+	write_pnet(&mrt->net, net);
+
+	rhltable_init(&mrt->mfc_hash, rht_params);
+	INIT_LIST_HEAD(&mrt->mfc_cache_list);
+	INIT_LIST_HEAD(&mrt->mfc_unres_queue);
+
+	timer_setup(&mrt->ipmr_expire_timer, expire_func, 0);
+
+	mrt->mroute_reg_vif_num = -1;
+	table_set(mrt, net);
+	return mrt;
+}
+EXPORT_SYMBOL(mr_table_alloc);

net/ipv6/ip6mr.c

@@ -31,7 +31,6 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
-#include <linux/slab.h>
 #include <linux/compat.h>
 #include <net/protocol.h>
 #include <linux/skbuff.h>
@@ -295,6 +294,14 @@ static const struct rhashtable_params ip6mr_rht_params = {
 	.automatic_shrinking = true,
 };
 
+static void ip6mr_new_table_set(struct mr_table *mrt,
+				struct net *net)
+{
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+	list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
+#endif
+}
+
 static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
 {
 	struct mr_table *mrt;
@@ -303,25 +310,8 @@ static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
 	if (mrt)
 		return mrt;
 
-	mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
-	if (!mrt)
-		return NULL;
-	mrt->id = id;
-	write_pnet(&mrt->net, net);
-
-	rhltable_init(&mrt->mfc_hash, &ip6mr_rht_params);
-	INIT_LIST_HEAD(&mrt->mfc_cache_list);
-	INIT_LIST_HEAD(&mrt->mfc_unres_queue);
-
-	timer_setup(&mrt->ipmr_expire_timer, ipmr_expire_process, 0);
-
-#ifdef CONFIG_IPV6_PIMSM_V2
-	mrt->mroute_reg_vif_num = -1;
-#endif
-#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
-	list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
-#endif
-	return mrt;
+	return mr_table_alloc(net, id, &ip6mr_rht_params,
+			      ipmr_expire_process, ip6mr_new_table_set);
 }
 
 static void ip6mr_free_table(struct mr_table *mrt)