tipc: remove interface state mirroring in bearer

struct 'tipc_bearer' is a generic representation of the underlying
media type, and exists in a one-to-one relationship to each interface
TIPC is using. The struct contains a 'blocked' flag that mirrors the
operational and execution state of the represented interface, and is
updated through notification calls from the latter. The users of
tipc_bearer are checking this flag before each attempt to send a
packet via the interface.

This state mirroring serves no purpose in the current code base. TIPC
links will not discover a media failure any faster through this
mechanism, and in reality the flag only adds overhead at packet
sending and reception.

Furthermore, the fact that the flag needs to be protected by a spinlock
aggregated into tipc_bearer has turned out to cause a serious and
completely unnecessary deadlock problem.

CPU0                                    CPU1
----                                    ----
Time 0: bearer_disable()                link_timeout()
Time 1:   spin_lock_bh(&b_ptr->lock)      tipc_link_push_queue()
Time 2:   tipc_link_delete()                tipc_bearer_blocked(b_ptr)
Time 3:     k_cancel_timer(&req->timer)       spin_lock_bh(&b_ptr->lock)
Time 4:       del_timer_sync(&req->timer)

I.e., del_timer_sync() on CPU0 never returns, because the timer handler
on CPU1 is waiting for the bearer lock.

We eliminate the 'blocked' flag from struct tipc_bearer, along with all
tests on this flag. This not only resolves the deadlock, but also
simplifies and speeds up the data path execution of TIPC. It also fits
well into our ongoing effort to make the locking policy simpler and
more manageable.

An effect of this change is that we can get rid of functions such as
tipc_bearer_blocked(), tipc_continue() and tipc_block_bearer().
We replace the latter with a new function, tipc_reset_bearer(), which
resets all links associated to the bearer immediately after an
interface goes down.

A user might notice one slight change in link behaviour after this
change. When an interface goes down, (e.g. through a NETDEV_DOWN
event) all attached links will be reset immediately, instead of
leaving it to each link to detect the failure through a timer-driven
mechanism. We consider this an improvement, and see no obvious risks
with the new behavior.

Signed-off-by: Erik Hugne <erik.hugne@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Paul Gortmaker <Paul.Gortmaker@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 13 deletions

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index ecc758c6eacf..bc849f1efa16 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -239,7 +239,7 @@ void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
 	/* Accept discovery message & send response, if necessary */
 	link_fully_up = link_working_working(link);
 
-	if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
+	if ((type == DSC_REQ_MSG) && !link_fully_up) {
 		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr);
 		if (rbuf) {
 			tipc_bearer_send(b_ptr, rbuf, &media_addr);
@@ -288,16 +288,6 @@ void tipc_disc_remove_dest(struct tipc_link_req *req)
 }
 
 /**
- * disc_send_msg - send link setup request message
- * @req: ptr to link request structure
- */
-static void disc_send_msg(struct tipc_link_req *req)
-{
-	if (!req->bearer->blocked)
-		tipc_bearer_send(req->bearer, req->buf, &req->dest);
-}
-
-/**
  * disc_timeout - send a periodic link setup request
  * @req: ptr to link request structure
  *
@@ -322,7 +312,8 @@ static void disc_timeout(struct tipc_link_req *req)
 	 * hold at fast polling rate if don't have any associated nodes,
 	 * otherwise hold at slow polling rate
 	 */
-	disc_send_msg(req);
+	tipc_bearer_send(req->bearer, req->buf, &req->dest);
+
 
 	req->timer_intv *= 2;
 	if (req->num_nodes)
@@ -368,7 +359,7 @@ int tipc_disc_create(struct tipc_bearer *b_ptr, struct tipc_media_addr *dest,
 	k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
 	k_start_timer(&req->timer, req->timer_intv);
 	b_ptr->link_req = req;
-	disc_send_msg(req);
+	tipc_bearer_send(req->bearer, req->buf, &req->dest);
 	return 0;
 }