#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 */
/**
* struct link_req - information about an ongoing link setup request
* @bearer: bearer issuing requests
* @dest: destination address for request messages
+ * @domain: network domain to which links can be established
+ * @num_nodes: number of nodes currently discovered (i.e. with an active link)
* @buf: request message to be (repeatedly) sent
* @timer: timer governing period between requests
* @timer_intv: current interval between requests (in ms)
struct link_req {
struct tipc_bearer *bearer;
struct tipc_media_addr dest;
+ u32 domain;
+ int num_nodes;
struct sk_buff *buf;
struct timer_list timer;
unsigned int timer_intv;
}
if (!tipc_in_scope(dest, tipc_own_addr))
return;
- if (!in_own_cluster(orig))
+ if (!tipc_in_scope(b_ptr->link_req->domain, orig))
return;
/* Locate structure corresponding to requesting node */
}
/**
- * tipc_disc_stop_link_req - stop sending periodic link setup requests
+ * 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
*/
-void tipc_disc_stop_link_req(struct link_req *req)
+static void disc_update(struct link_req *req)
{
- if (!req)
- return;
+ 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);
+ }
+ }
+}
- k_cancel_timer(&req->timer);
- k_term_timer(&req->timer);
- buf_discard(req->buf);
- kfree(req);
+/**
+ * tipc_disc_add_dest - increment set of discovered nodes
+ * @req: ptr to link request structure
+ */
+
+void tipc_disc_add_dest(struct link_req *req)
+{
+ req->num_nodes++;
}
/**
- * tipc_disc_update_link_req - update frequency of periodic link setup requests
+ * tipc_disc_remove_dest - decrement set of discovered nodes
* @req: ptr to link request structure
*/
-void tipc_disc_update_link_req(struct link_req *req)
+void tipc_disc_remove_dest(struct link_req *req)
{
- if (!req)
- return;
+ req->num_nodes--;
+ disc_update(req);
+}
- if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
- if (!req->bearer->nodes.count) {
- req->timer_intv = TIPC_LINK_REQ_FAST;
- 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 */
- }
+/**
+ * disc_send_msg - send link setup request message
+ * @req: ptr to link request structure
+ */
+
+static void disc_send_msg(struct link_req *req)
+{
+ if (!req->bearer->blocked)
+ tipc_bearer_send(req->bearer, req->buf, &req->dest);
}
/**
static void disc_timeout(struct link_req *req)
{
+ int max_delay;
+
spin_lock_bh(&req->bearer->lock);
- req->bearer->media->send_msg(req->buf, req->bearer, &req->dest);
-
- 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;
+ /* Stop searching if only desired node has been found */
+
+ 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);
}
/**
- * tipc_disc_init_link_req - start sending periodic link setup requests
+ * tipc_disc_create - create object to send periodic link setup requests
* @b_ptr: ptr to bearer issuing requests
* @dest: destination address for request messages
- * @dest_domain: network domain of node(s) which should respond to message
+ * @dest_domain: network domain to which links can be established
*
- * Returns pointer to link request structure, or NULL if unable to create.
+ * Returns 0 if successful, otherwise -errno.
*/
-struct link_req *tipc_disc_init_link_req(struct tipc_bearer *b_ptr,
- const struct tipc_media_addr *dest,
- u32 dest_domain)
+int tipc_disc_create(struct tipc_bearer *b_ptr,
+ struct tipc_media_addr *dest, u32 dest_domain)
{
struct link_req *req;
req = kmalloc(sizeof(*req), GFP_ATOMIC);
if (!req)
- return NULL;
+ return -ENOMEM;
req->buf = tipc_disc_init_msg(DSC_REQ_MSG, dest_domain, b_ptr);
if (!req->buf) {
kfree(req);
- return NULL;
+ return -ENOMSG;
}
memcpy(&req->dest, dest, sizeof(*dest));
req->bearer = b_ptr;
+ req->domain = dest_domain;
+ req->num_nodes = 0;
req->timer_intv = TIPC_LINK_REQ_INIT;
k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
k_start_timer(&req->timer, req->timer_intv);
- return req;
+ b_ptr->link_req = req;
+ disc_send_msg(req);
+ return 0;
+}
+
+/**
+ * tipc_disc_delete - destroy object sending periodic link setup requests
+ * @req: ptr to link request structure
+ */
+
+void tipc_disc_delete(struct link_req *req)
+{
+ k_cancel_timer(&req->timer);
+ k_term_timer(&req->timer);
+ buf_discard(req->buf);
+ kfree(req);
}
projects / mv-sheeva.git / blobdiff