tipc: Allow run-time alteration of default link settings

Permits run-time alteration of default link settings on a per-media
and per-bearer basis, in addition to the existing per-link basis.
The following syntax can now be used:

    tipc-config -lt=<link-name|bearer-name|media-name>/<tolerance>
    tipc-config -lp=<link-name|bearer-name|media-name>/<priority>
    tipc-config -lw=<link-name|bearer-name|media-name>/<window>

Note that changes to the default settings for a given media type has
no effect on the default settings used by existing bearers. Similarly,
changes to default bearer settings has no effect on existing link
endpoints that utilize that interface.

Thanks to Florian Westphal <fw@strlen.de> for his contributions to
the development of this enhancement.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/tipc/bearer.h b/net/tipc/bearer.h
index 54a5a575d69a..cfe77c4b20f9 100644
--- a/net/tipc/bearer.h
+++ b/net/tipc/bearer.h
@@ -118,6 +118,8 @@ struct media {
  * @name: bearer name (format = media:interface)
  * @media: ptr to media structure associated with bearer
  * @priority: default link priority for bearer
+ * @window: default window size for bearer
+ * @tolerance: default link tolerance for bearer
  * @identity: array index of this bearer within TIPC bearer array
  * @link_req: ptr to (optional) structure making periodic link setup requests
  * @links: list of non-congested links associated with bearer
@@ -139,6 +141,8 @@ struct tipc_bearer {
         spinlock_t lock;
         struct media *media;
         u32 priority;
+        u32 window;
+        u32 tolerance;
         u32 identity;
         struct link_req *link_req;
         struct list_head links;
@@ -176,6 +180,8 @@ int tipc_disable_bearer(const char *name);
 int  tipc_eth_media_start(void);
 void tipc_eth_media_stop(void);
 
+int tipc_media_set_priority(const char *name, u32 new_value);
+int tipc_media_set_window(const char *name, u32 new_value);
 void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
 struct sk_buff *tipc_media_get_names(void);
 
@@ -183,7 +189,9 @@ struct sk_buff *tipc_bearer_get_names(void);
 void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest);
 void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest);
 void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr);
+struct tipc_bearer *tipc_bearer_find(const char *name);
 struct tipc_bearer *tipc_bearer_find_interface(const char *if_name);
+struct media *tipc_media_find(const char *name);
 int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr);
 int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr);
 void tipc_bearer_stop(void);