tipc: Optimizations to link creation code
Enhances link creation code as follows:
1) Detects illegal attempts to add a requested link earlier in the
link creation process. This prevents TIPC from wasting time
initializing a link object it then throws away, and also eliminates
the code needed to do the throwing away.
2) Passes in the node object associated with the requested link.
This allows TIPC to eliminate a search to locate the node object,
as well as code that attempted to create the node if it doesn't
exist.
Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index 580b50a..caac5c9 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -169,7 +169,7 @@
/* Create a link endpoint for this bearer, if necessary */
if (!link) {
- link = tipc_link_create(b_ptr, orig, &media_addr);
+ link = tipc_link_create(n_ptr, b_ptr, &media_addr);
if (!link) {
tipc_node_unlock(n_ptr);
return;
diff --git a/net/tipc/link.c b/net/tipc/link.c
index e5f96d5..b73adeb 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -293,19 +293,35 @@
/**
* tipc_link_create - create a new link
+ * @n_ptr: pointer to associated node
* @b_ptr: pointer to associated bearer
- * @peer: network address of node at other end of link
* @media_addr: media address to use when sending messages over link
*
* Returns pointer to link.
*/
-struct link *tipc_link_create(struct tipc_bearer *b_ptr, const u32 peer,
+struct link *tipc_link_create(struct tipc_node *n_ptr,
+ struct tipc_bearer *b_ptr,
const struct tipc_media_addr *media_addr)
{
struct link *l_ptr;
struct tipc_msg *msg;
char *if_name;
+ char addr_string[16];
+ u32 peer = n_ptr->addr;
+
+ if (n_ptr->link_cnt >= 2) {
+ tipc_addr_string_fill(addr_string, n_ptr->addr);
+ err("Attempt to establish third link to %s\n", addr_string);
+ return NULL;
+ }
+
+ if (n_ptr->links[b_ptr->identity]) {
+ tipc_addr_string_fill(addr_string, n_ptr->addr);
+ err("Attempt to establish second link on <%s> to %s\n",
+ b_ptr->name, addr_string);
+ return NULL;
+ }
l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
if (!l_ptr) {
@@ -322,6 +338,7 @@
tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
/* note: peer i/f is appended to link name by reset/activate */
memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
+ l_ptr->owner = n_ptr;
l_ptr->checkpoint = 1;
l_ptr->b_ptr = b_ptr;
link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
@@ -345,11 +362,7 @@
link_reset_statistics(l_ptr);
- l_ptr->owner = tipc_node_attach_link(l_ptr);
- if (!l_ptr->owner) {
- kfree(l_ptr);
- return NULL;
- }
+ tipc_node_attach_link(n_ptr, l_ptr);
k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
list_add_tail(&l_ptr->link_list, &b_ptr->links);
diff --git a/net/tipc/link.h b/net/tipc/link.h
index a7794e7..e6a30db 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -207,7 +207,8 @@
struct tipc_port;
-struct link *tipc_link_create(struct tipc_bearer *b_ptr, const u32 peer,
+struct link *tipc_link_create(struct tipc_node *n_ptr,
+ struct tipc_bearer *b_ptr,
const struct tipc_media_addr *media_addr);
void tipc_link_delete(struct link *l_ptr);
void tipc_link_changeover(struct link *l_ptr);
diff --git a/net/tipc/node.c b/net/tipc/node.c
index ca09b33..2d106ef 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -238,33 +238,11 @@
return tipc_node_active_links(n_ptr);
}
-struct tipc_node *tipc_node_attach_link(struct link *l_ptr)
+void tipc_node_attach_link(struct tipc_node *n_ptr, struct link *l_ptr)
{
- struct tipc_node *n_ptr = tipc_node_find(l_ptr->addr);
-
- if (!n_ptr)
- n_ptr = tipc_node_create(l_ptr->addr);
- if (n_ptr) {
- u32 bearer_id = l_ptr->b_ptr->identity;
- char addr_string[16];
-
- if (n_ptr->link_cnt >= 2) {
- err("Attempt to create third link to %s\n",
- tipc_addr_string_fill(addr_string, n_ptr->addr));
- return NULL;
- }
-
- if (!n_ptr->links[bearer_id]) {
- n_ptr->links[bearer_id] = l_ptr;
- atomic_inc(&tipc_num_links);
- n_ptr->link_cnt++;
- return n_ptr;
- }
- err("Attempt to establish second link on <%s> to %s\n",
- l_ptr->b_ptr->name,
- tipc_addr_string_fill(addr_string, l_ptr->addr));
- }
- return NULL;
+ n_ptr->links[l_ptr->b_ptr->identity] = l_ptr;
+ atomic_inc(&tipc_num_links);
+ n_ptr->link_cnt++;
}
void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr)
diff --git a/net/tipc/node.h b/net/tipc/node.h
index dde3165..5c61afc 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -111,7 +111,7 @@
struct tipc_node *tipc_node_find(u32 addr);
struct tipc_node *tipc_node_create(u32 addr);
void tipc_node_delete(struct tipc_node *n_ptr);
-struct tipc_node *tipc_node_attach_link(struct link *l_ptr);
+void tipc_node_attach_link(struct tipc_node *n_ptr, struct link *l_ptr);
void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr);
void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr);
void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr);