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authorAllan Stephens <Allan.Stephens@windriver.com>2011-04-21 20:34:03 -0500
committerPaul Gortmaker <paul.gortmaker@windriver.com>2011-05-10 16:04:02 -0400
commit972a77fbf1bbea6f54b5986b05041a17b607695b (patch)
tree92cf6c72788652de9d8f6228c110bdc671a9f1fe /net/tipc
parent1209966cd5d2ec7f89ad2ed58a6a342aa8ea8712 (diff)
tipc: Revise timings used when sending link request messages
Revises the algorithm governing the sending of link request messages to take into account the number of nodes each bearer is currently in contact with, and to ensure more rapid rediscovery of neighboring nodes if a bearer fails and then recovers. The discovery object now sends requests at least once a second if it is not in contact with any other nodes, and at least once a minute if it has at least one neighbor; if contact with the only neighbor is lost, the object immediately reverts to its initial rapid-fire search timing to accelerate the rediscovery process. In addition, the discovery object now stops issuing link request messages if it is in contact with the only neighboring node it is configured to communicate with, since further searching is unnecessary. Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/discover.c66
1 files changed, 36 insertions, 30 deletions
diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index 3cb232d1f5dc..0987933155b9 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -39,13 +39,9 @@
#include "discover.h"
#define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */
-#define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */
-#define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */
-
-/*
- * TODO: Most of the inter-cluster setup stuff should be
- * rewritten, and be made conformant with specification.
- */
+#define TIPC_LINK_REQ_FAST 1000 /* max delay if bearer has no links */
+#define TIPC_LINK_REQ_SLOW 60000 /* max delay if bearer has links */
+#define TIPC_LINK_REQ_INACTIVE 0xffffffff /* indicates no timer in use */
/**
@@ -220,22 +216,19 @@ void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
/**
* disc_update - update frequency of periodic link setup requests
* @req: ptr to link request structure
+ *
+ * Reinitiates discovery process if discovery object has no associated nodes
+ * and is either not currently searching or is searching at a slow rate
*/
static void disc_update(struct link_req *req)
{
- if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
- if (!req->bearer->nodes.count) {
- req->timer_intv = TIPC_LINK_REQ_FAST;
+ if (!req->num_nodes) {
+ if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
+ (req->timer_intv > TIPC_LINK_REQ_FAST)) {
+ req->timer_intv = TIPC_LINK_REQ_INIT;
k_start_timer(&req->timer, req->timer_intv);
}
- } else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
- if (req->bearer->nodes.count) {
- req->timer_intv = TIPC_LINK_REQ_SLOW;
- k_start_timer(&req->timer, req->timer_intv);
- }
- } else {
- /* leave timer "as is" if haven't yet reached a "normal" rate */
}
}
@@ -247,7 +240,6 @@ static void disc_update(struct link_req *req)
void tipc_disc_add_dest(struct link_req *req)
{
req->num_nodes++;
- disc_update(req);
}
/**
@@ -281,23 +273,37 @@ static void disc_send_msg(struct link_req *req)
static void disc_timeout(struct link_req *req)
{
+ int max_delay;
+
spin_lock_bh(&req->bearer->lock);
- disc_send_msg(req);
+ /* Stop searching if only desired node has been found */
- if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
- (req->timer_intv == TIPC_LINK_REQ_FAST)) {
- /* leave timer interval "as is" if already at a "normal" rate */
- } else {
- req->timer_intv *= 2;
- if (req->timer_intv > TIPC_LINK_REQ_FAST)
- req->timer_intv = TIPC_LINK_REQ_FAST;
- if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
- (req->bearer->nodes.count))
- req->timer_intv = TIPC_LINK_REQ_SLOW;
+ if (tipc_node(req->domain) && req->num_nodes) {
+ req->timer_intv = TIPC_LINK_REQ_INACTIVE;
+ goto exit;
}
- k_start_timer(&req->timer, req->timer_intv);
+ /*
+ * Send discovery message, then update discovery timer
+ *
+ * Keep doubling time between requests until limit is reached;
+ * hold at fast polling rate if don't have any associated nodes,
+ * otherwise hold at slow polling rate
+ */
+
+ disc_send_msg(req);
+
+ req->timer_intv *= 2;
+ if (req->num_nodes)
+ max_delay = TIPC_LINK_REQ_SLOW;
+ else
+ max_delay = TIPC_LINK_REQ_FAST;
+ if (req->timer_intv > max_delay)
+ req->timer_intv = max_delay;
+
+ k_start_timer(&req->timer, req->timer_intv);
+exit:
spin_unlock_bh(&req->bearer->lock);
}