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Date: Thu, 27 Mar 2014 12:54:37 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <davem@...emloft.net>
CC: <jon.maloy@...csson.com>, <Paul.Gortmaker@...driver.com>,
<erik.hugne@...csson.com>, <netdev@...r.kernel.org>,
<tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net-next 08/10] tipc: tipc: convert node list and node hlist to RCU lists
Convert tipc_node_list list and node_htable hash list to RCU lists.
On read side, the two lists are protected with RCU read lock, and
on update side, node_list_lock is applied to them.
Signed-off-by: Ying Xue <ying.xue@...driver.com>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
---
net/tipc/link.c | 16 ++++++++++------
net/tipc/name_distr.c | 6 +++---
net/tipc/node.c | 28 ++++++++++++++++------------
net/tipc/node.h | 2 ++
4 files changed, 31 insertions(+), 21 deletions(-)
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 882c5c9..c5190ab 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -280,13 +280,13 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
return l_ptr;
}
-
void tipc_link_delete_list(unsigned int bearer_id, bool shutting_down)
{
struct tipc_link *l_ptr;
struct tipc_node *n_ptr;
- list_for_each_entry(n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
spin_lock_bh(&n_ptr->lock);
l_ptr = n_ptr->links[bearer_id];
if (l_ptr) {
@@ -309,6 +309,7 @@ void tipc_link_delete_list(unsigned int bearer_id, bool shutting_down)
}
spin_unlock_bh(&n_ptr->lock);
}
+ rcu_read_unlock();
}
/**
@@ -461,13 +462,15 @@ void tipc_link_reset_list(unsigned int bearer_id)
struct tipc_link *l_ptr;
struct tipc_node *n_ptr;
- list_for_each_entry(n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
spin_lock_bh(&n_ptr->lock);
l_ptr = n_ptr->links[bearer_id];
if (l_ptr)
tipc_link_reset(l_ptr);
spin_unlock_bh(&n_ptr->lock);
}
+ rcu_read_unlock();
}
static void link_activate(struct tipc_link *l_ptr)
@@ -2404,13 +2407,12 @@ static struct tipc_node *tipc_link_find_owner(const char *link_name,
{
struct tipc_link *l_ptr;
struct tipc_node *n_ptr;
- struct tipc_node *tmp_n_ptr;
struct tipc_node *found_node = 0;
-
int i;
*bearer_id = 0;
- list_for_each_entry_safe(n_ptr, tmp_n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
tipc_node_lock(n_ptr);
for (i = 0; i < MAX_BEARERS; i++) {
l_ptr = n_ptr->links[i];
@@ -2424,6 +2426,8 @@ static struct tipc_node *tipc_link_find_owner(const char *link_name,
if (found_node)
break;
}
+ rcu_read_unlock();
+
return found_node;
}
diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
index c5904d1..aff8041 100644
--- a/net/tipc/name_distr.c
+++ b/net/tipc/name_distr.c
@@ -133,8 +133,8 @@ static void named_cluster_distribute(struct sk_buff *buf)
struct tipc_node *n_ptr;
struct tipc_link *l_ptr;
- read_lock_bh(&tipc_net_lock);
- list_for_each_entry(n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
spin_lock_bh(&n_ptr->lock);
l_ptr = n_ptr->active_links[n_ptr->addr & 1];
if (l_ptr) {
@@ -148,7 +148,7 @@ static void named_cluster_distribute(struct sk_buff *buf)
}
spin_unlock_bh(&n_ptr->lock);
}
- read_unlock_bh(&tipc_net_lock);
+ rcu_read_unlock();
kfree_skb(buf);
}
diff --git a/net/tipc/node.c b/net/tipc/node.c
index ec83607..4f517ff 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -72,14 +72,14 @@ struct tipc_node *tipc_node_find(u32 addr)
if (unlikely(!in_own_cluster_exact(addr)))
return NULL;
- spin_lock_bh(&node_list_lock);
- hlist_for_each_entry(node, &node_htable[tipc_hashfn(addr)], hash) {
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(node, &node_htable[tipc_hashfn(addr)], hash) {
if (node->addr == addr) {
- spin_unlock_bh(&node_list_lock);
+ rcu_read_unlock();
return node;
}
}
- spin_unlock_bh(&node_list_lock);
+ rcu_read_unlock();
return NULL;
}
@@ -102,13 +102,13 @@ struct tipc_node *tipc_node_create(u32 addr)
INIT_LIST_HEAD(&n_ptr->list);
INIT_LIST_HEAD(&n_ptr->nsub);
- hlist_add_head(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
+ hlist_add_head_rcu(&n_ptr->hash, &node_htable[tipc_hashfn(addr)]);
- list_for_each_entry(temp_node, &tipc_node_list, list) {
+ list_for_each_entry_rcu(temp_node, &tipc_node_list, list) {
if (n_ptr->addr < temp_node->addr)
break;
}
- list_add_tail(&n_ptr->list, &temp_node->list);
+ list_add_tail_rcu(&n_ptr->list, &temp_node->list);
n_ptr->block_setup = WAIT_PEER_DOWN;
n_ptr->signature = INVALID_NODE_SIG;
@@ -120,9 +120,9 @@ struct tipc_node *tipc_node_create(u32 addr)
static void tipc_node_delete(struct tipc_node *n_ptr)
{
- list_del(&n_ptr->list);
- hlist_del(&n_ptr->hash);
- kfree(n_ptr);
+ list_del_rcu(&n_ptr->list);
+ hlist_del_rcu(&n_ptr->hash);
+ kfree_rcu(n_ptr, rcu);
tipc_num_nodes--;
}
@@ -359,7 +359,8 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
}
/* Add TLVs for all nodes in scope */
- list_for_each_entry(n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
if (!tipc_in_scope(domain, n_ptr->addr))
continue;
node_info.addr = htonl(n_ptr->addr);
@@ -367,6 +368,7 @@ struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space)
tipc_cfg_append_tlv(buf, TIPC_TLV_NODE_INFO,
&node_info, sizeof(node_info));
}
+ rcu_read_unlock();
spin_unlock_bh(&node_list_lock);
return buf;
}
@@ -412,7 +414,8 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
tipc_cfg_append_tlv(buf, TIPC_TLV_LINK_INFO, &link_info, sizeof(link_info));
/* Add TLVs for any other links in scope */
- list_for_each_entry(n_ptr, &tipc_node_list, list) {
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
u32 i;
if (!tipc_in_scope(domain, n_ptr->addr))
@@ -429,6 +432,7 @@ struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space)
}
tipc_node_unlock(n_ptr);
}
+ rcu_read_unlock();
spin_unlock_bh(&node_list_lock);
return buf;
}
diff --git a/net/tipc/node.h b/net/tipc/node.h
index 4203869..7cbb8ce 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -66,6 +66,7 @@
* @link_cnt: number of links to node
* @signature: node instance identifier
* @bclink: broadcast-related info
+ * @rcu: rcu struct for tipc_node
* @acked: sequence # of last outbound b'cast message acknowledged by node
* @last_in: sequence # of last in-sequence b'cast message received from node
* @last_sent: sequence # of last b'cast message sent by node
@@ -89,6 +90,7 @@ struct tipc_node {
int working_links;
int block_setup;
u32 signature;
+ struct rcu_head rcu;
struct {
u32 acked;
u32 last_in;
--
1.7.9.5
--
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