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Commit 8f3d0023 authored by Julian Anastasov's avatar Julian Anastasov Committed by Pablo Neira Ayuso
Browse files

ipvs: convert dh scheduler to rcu 



Use the new add_dest and del_dest methods
to reassign dests.

Signed-off-by: default avatarJulian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarSimon Horman <horms@verge.net.au>
parent fca9c20a

net/netfilter/ipvs/ip_vs_dh.c

+45 −36
Original line number Diff line number Diff line
@@ -51,7 +51,7 @@ 
 *      IPVS DH bucket

 */

struct ip_vs_dh_bucket {

	struct ip_vs_dest       *dest;          /* real server (cache) */

	struct ip_vs_dest __rcu	*dest;	/* real server (cache) */

};



/*
@@ -64,6 +64,10 @@ struct ip_vs_dh_bucket { 
#define IP_VS_DH_TAB_SIZE               (1 << IP_VS_DH_TAB_BITS)

#define IP_VS_DH_TAB_MASK               (IP_VS_DH_TAB_SIZE - 1)



struct ip_vs_dh_state {

	struct ip_vs_dh_bucket		buckets[IP_VS_DH_TAB_SIZE];

	struct rcu_head			rcu_head;

};



/*

 *	Returns hash value for IPVS DH entry
@@ -85,10 +89,9 @@ static inline unsigned int ip_vs_dh_hashkey(int af, const union nf_inet_addr *ad 
 *      Get ip_vs_dest associated with supplied parameters.

 */

static inline struct ip_vs_dest *

ip_vs_dh_get(int af, struct ip_vs_dh_bucket *tbl,

	     const union nf_inet_addr *addr)

ip_vs_dh_get(int af, struct ip_vs_dh_state *s, const union nf_inet_addr *addr)

{

	return (tbl[ip_vs_dh_hashkey(af, addr)]).dest;

	return rcu_dereference(s->buckets[ip_vs_dh_hashkey(af, addr)].dest);

}
@@ -96,25 +99,30 @@ ip_vs_dh_get(int af, struct ip_vs_dh_bucket *tbl, 
 *      Assign all the hash buckets of the specified table with the service.

 */

static int

ip_vs_dh_assign(struct ip_vs_dh_bucket *tbl, struct ip_vs_service *svc)

ip_vs_dh_reassign(struct ip_vs_dh_state *s, struct ip_vs_service *svc)

{

	int i;

	struct ip_vs_dh_bucket *b;

	struct list_head *p;

	struct ip_vs_dest *dest;

	bool empty;



	b = tbl;

	b = &s->buckets[0];

	p = &svc->destinations;

	empty = list_empty(p);

	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {

		if (list_empty(p)) {

			b->dest = NULL;

		} else {

		dest = rcu_dereference_protected(b->dest, 1);

		if (dest)

			ip_vs_dest_put(dest);

		if (empty)

			RCU_INIT_POINTER(b->dest, NULL);

		else {

			if (p == &svc->destinations)

				p = p->next;



			dest = list_entry(p, struct ip_vs_dest, n_list);

			atomic_inc(&dest->refcnt);

			b->dest = dest;

			ip_vs_dest_hold(dest);

			RCU_INIT_POINTER(b->dest, dest);



			p = p->next;

		}
@@ -127,16 +135,18 @@ ip_vs_dh_assign(struct ip_vs_dh_bucket *tbl, struct ip_vs_service *svc) 
/*

 *      Flush all the hash buckets of the specified table.

 */

static void ip_vs_dh_flush(struct ip_vs_dh_bucket *tbl)

static void ip_vs_dh_flush(struct ip_vs_dh_state *s)

{

	int i;

	struct ip_vs_dh_bucket *b;

	struct ip_vs_dest *dest;



	b = tbl;

	b = &s->buckets[0];

	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {

		if (b->dest) {

			atomic_dec(&b->dest->refcnt);

			b->dest = NULL;

		dest = rcu_dereference_protected(b->dest, 1);

		if (dest) {

			ip_vs_dest_put(dest);

			RCU_INIT_POINTER(b->dest, NULL);

		}

		b++;

	}
@@ -145,21 +155,20 @@ static void ip_vs_dh_flush(struct ip_vs_dh_bucket *tbl) 


static int ip_vs_dh_init_svc(struct ip_vs_service *svc)

{

	struct ip_vs_dh_bucket *tbl;

	struct ip_vs_dh_state *s;



	/* allocate the DH table for this service */

	tbl = kmalloc(sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE,

		      GFP_KERNEL);

	if (tbl == NULL)

	s = kzalloc(sizeof(struct ip_vs_dh_state), GFP_KERNEL);

	if (s == NULL)

		return -ENOMEM;



	svc->sched_data = tbl;

	svc->sched_data = s;

	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) allocated for "

		  "current service\n",

		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);



	/* assign the hash buckets with the updated service */

	ip_vs_dh_assign(tbl, svc);

	/* assign the hash buckets with current dests */

	ip_vs_dh_reassign(s, svc);



	return 0;

}
@@ -167,13 +176,13 @@ static int ip_vs_dh_init_svc(struct ip_vs_service *svc) 


static int ip_vs_dh_done_svc(struct ip_vs_service *svc)

{

	struct ip_vs_dh_bucket *tbl = svc->sched_data;

	struct ip_vs_dh_state *s = svc->sched_data;



	/* got to clean up hash buckets here */

	ip_vs_dh_flush(tbl);

	ip_vs_dh_flush(s);



	/* release the table itself */

	kfree(svc->sched_data);

	kfree_rcu(s, rcu_head);

	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) released\n",

		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);
@@ -181,15 +190,13 @@ static int ip_vs_dh_done_svc(struct ip_vs_service *svc) 
}





static int ip_vs_dh_update_svc(struct ip_vs_service *svc)

static int ip_vs_dh_dest_changed(struct ip_vs_service *svc,

				 struct ip_vs_dest *dest)

{

	struct ip_vs_dh_bucket *tbl = svc->sched_data;



	/* got to clean up hash buckets here */

	ip_vs_dh_flush(tbl);

	struct ip_vs_dh_state *s = svc->sched_data;



	/* assign the hash buckets with the updated service */

	ip_vs_dh_assign(tbl, svc);

	ip_vs_dh_reassign(s, svc);



	return 0;

}
@@ -212,19 +219,20 @@ static struct ip_vs_dest * 
ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)

{

	struct ip_vs_dest *dest;

	struct ip_vs_dh_bucket *tbl;

	struct ip_vs_dh_state *s;

	struct ip_vs_iphdr iph;



	ip_vs_fill_iph_addr_only(svc->af, skb, &iph);



	IP_VS_DBG(6, "%s(): Scheduling...\n", __func__);



	tbl = (struct ip_vs_dh_bucket *)svc->sched_data;

	dest = ip_vs_dh_get(svc->af, tbl, &iph.daddr);

	s = (struct ip_vs_dh_state *) svc->sched_data;

	dest = ip_vs_dh_get(svc->af, s, &iph.daddr);

	if (!dest

	    || !(dest->flags & IP_VS_DEST_F_AVAILABLE)

	    || atomic_read(&dest->weight) <= 0

	    || is_overloaded(dest)) {

		ip_vs_scheduler_err(svc, "no destination available");

		return NULL;

	}
@@ -248,7 +256,8 @@ static struct ip_vs_scheduler ip_vs_dh_scheduler = 
	.n_list =		LIST_HEAD_INIT(ip_vs_dh_scheduler.n_list),

	.init_service =		ip_vs_dh_init_svc,

	.done_service =		ip_vs_dh_done_svc,

	.update_service =	ip_vs_dh_update_svc,

	.add_dest =		ip_vs_dh_dest_changed,

	.del_dest =		ip_vs_dh_dest_changed,

	.schedule =		ip_vs_dh_schedule,

};