Commit e9c1a793 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

tipc: add dst_cache support for udp media 



As other udp/ip tunnels do, tipc udp media should also have a
lockless dst_cache supported on its tx path.

Here we add dst_cache into udp_replicast to support dst cache
for both rmcast and rcast, and rmcast uses ub->rcast and each
rcast uses its own node in ub->rcast.list.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Acked-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d96ff269

net/tipc/udp_media.c

+47 −25
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ struct udp_media_addr { 
/* struct udp_replicast - container for UDP remote addresses */

struct udp_replicast {

	struct udp_media_addr addr;

	struct dst_cache dst_cache;

	struct rcu_head rcu;

	struct list_head list;

};
@@ -158,12 +159,15 @@ static int tipc_udp_addr2msg(char *msg, struct tipc_media_addr *a) 
/* tipc_send_msg - enqueue a send request */

static int tipc_udp_xmit(struct net *net, struct sk_buff *skb,

			 struct udp_bearer *ub, struct udp_media_addr *src,

			 struct udp_media_addr *dst)

			 struct udp_media_addr *dst, struct dst_cache *cache)

{

	struct dst_entry *ndst = dst_cache_get(cache);

	int ttl, err = 0;

	struct rtable *rt;



	if (dst->proto == htons(ETH_P_IP)) {

		struct rtable *rt = (struct rtable *)ndst;



		if (!rt) {

			struct flowi4 fl = {

				.daddr = dst->ipv4.s_addr,

				.saddr = src->ipv4.s_addr,
@@ -175,6 +179,8 @@ static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 
				err = PTR_ERR(rt);

				goto tx_error;

			}

			dst_cache_set_ip4(cache, &rt->dst, fl.saddr);

		}



		ttl = ip4_dst_hoplimit(&rt->dst);

		udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb, src->ipv4.s_addr,
@@ -182,17 +188,19 @@ static int tipc_udp_xmit(struct net *net, struct sk_buff *skb, 
				    dst->port, false, true);

#if IS_ENABLED(CONFIG_IPV6)

	} else {

		struct dst_entry *ndst;

		if (!ndst) {

			struct flowi6 fl6 = {

				.flowi6_oif = ub->ifindex,

				.daddr = dst->ipv6,

				.saddr = src->ipv6,

				.flowi6_proto = IPPROTO_UDP

			};

		err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk, &ndst,

						 &fl6);

			err = ipv6_stub->ipv6_dst_lookup(net, ub->ubsock->sk,

							 &ndst, &fl6);

			if (err)

				goto tx_error;

			dst_cache_set_ip6(cache, ndst, &fl6.saddr);

		}

		ttl = ip6_dst_hoplimit(ndst);

		err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb, NULL,

					   &src->ipv6, &dst->ipv6, 0, ttl, 0,
@@ -230,7 +238,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 
	}



	if (addr->broadcast != TIPC_REPLICAST_SUPPORT)

		return tipc_udp_xmit(net, skb, ub, src, dst);

		return tipc_udp_xmit(net, skb, ub, src, dst,

				     &ub->rcast.dst_cache);



	/* Replicast, send an skb to each configured IP address */

	list_for_each_entry_rcu(rcast, &ub->rcast.list, list) {
@@ -242,7 +251,8 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb, 
			goto out;

		}



		err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr);

		err = tipc_udp_xmit(net, _skb, ub, src, &rcast->addr,

				    &rcast->dst_cache);

		if (err)

			goto out;

	}
@@ -286,6 +296,11 @@ static int tipc_udp_rcast_add(struct tipc_bearer *b, 
	if (!rcast)

		return -ENOMEM;



	if (dst_cache_init(&rcast->dst_cache, GFP_ATOMIC)) {

		kfree(rcast);

		return -ENOMEM;

	}



	memcpy(&rcast->addr, addr, sizeof(struct udp_media_addr));



	if (ntohs(addr->proto) == ETH_P_IP)
@@ -742,6 +757,10 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 
	tuncfg.encap_destroy = NULL;

	setup_udp_tunnel_sock(net, ub->ubsock, &tuncfg);



	err = dst_cache_init(&ub->rcast.dst_cache, GFP_ATOMIC);

	if (err)

		goto err;



	/**

	 * The bcast media address port is used for all peers and the ip

	 * is used if it's a multicast address.
@@ -756,6 +775,7 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b, 


	return 0;

err:

	dst_cache_destroy(&ub->rcast.dst_cache);

	if (ub->ubsock)

		udp_tunnel_sock_release(ub->ubsock);

	kfree(ub);
@@ -769,10 +789,12 @@ static void cleanup_bearer(struct work_struct *work) 
	struct udp_replicast *rcast, *tmp;



	list_for_each_entry_safe(rcast, tmp, &ub->rcast.list, list) {

		dst_cache_destroy(&rcast->dst_cache);

		list_del_rcu(&rcast->list);

		kfree_rcu(rcast, rcu);

	}



	dst_cache_destroy(&ub->rcast.dst_cache);

	if (ub->ubsock)

		udp_tunnel_sock_release(ub->ubsock);

	synchronize_net();

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