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tipc: reverse call order for link_reset()->node_link_down() 

In many cases the call order when a link is reset goes as follows:
tipc_node_xx()->tipc_link_reset()->tipc_node_link_down()

This is not the right order if we want the node to be in control,
so in this commit we change the order to:
tipc_node_xx()->tipc_node_link_down()->tipc_link_reset()

The fact that tipc_link_reset() now is called from only one
location with a well-defined state will also facilitate later
simplifications of tipc_link_reset() and the link FSM.

Tested-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2015-07-30 18:24:17 -04:00 committed by David S. Miller
parent 6144a996a6
commit 655fb243b8
2 changed files with 22 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/tipc/link.c
View File

@ -566,7 +566,6 @@ void tipc_link_purge_queues(struct tipc_link *l_ptr)
void tipc_link_reset(struct tipc_link *l_ptr)
{
u32 prev_state = l_ptr->state;
int was_active_link = tipc_link_is_active(l_ptr);
struct tipc_node *owner = l_ptr->owner;
struct tipc_link *pl = tipc_parallel_link(l_ptr);
@ -584,10 +583,7 @@ void tipc_link_reset(struct tipc_link *l_ptr)
(prev_state == TIPC_LINK_ESTABLISHING))
return;
tipc_node_link_down(l_ptr->owner, l_ptr->bearer_id);
tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr);
if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
if (tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
l_ptr->exec_mode = TIPC_LINK_BLOCKED;
l_ptr->failover_checkpt = l_ptr->rcv_nxt;
pl->failover_pkts = FIRST_FAILOVER;

30
net/tipc/node.c
View File

@ -265,7 +265,7 @@ static void tipc_node_timeout(unsigned long data)
tipc_node_calculate_timer(n, l);
rc = tipc_link_timeout(l, &xmitq);
if (rc & TIPC_LINK_DOWN_EVT)
tipc_link_reset(l);
tipc_node_link_down(n, bearer_id);
}
tipc_node_unlock(n);
maddr = &n->links[bearer_id].maddr;
@ -338,10 +338,15 @@ void tipc_node_link_down(struct tipc_node *n, int bearer_id)
struct tipc_link *l, *_l;
l = n->links[bearer_id].link;
if (!l || !tipc_link_is_up(l))
return;
n->working_links--;
n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
n->link_id = l->peer_bearer_id << 16 | l->bearer_id;
tipc_bearer_remove_dest(n->net, l->bearer_id, n->addr);
pr_debug("Lost link <%s> on network plane %c\n",
l->name, l->net_plane);
@ -352,6 +357,8 @@ void tipc_node_link_down(struct tipc_node *n, int bearer_id)
_l = n->links[i].link;
if (!_l || !tipc_link_is_up(_l))
continue;
if (_l == l)
continue;
if (_l->priority < highest)
continue;
if (_l->priority > highest) {
@ -362,9 +369,13 @@ void tipc_node_link_down(struct tipc_node *n, int bearer_id)
}
*slot1 = i;
}
if (tipc_node_is_up(n))
tipc_link_failover_send_queue(l);
else
tipc_link_reset(l);
if (!tipc_node_is_up(n))
node_lost_contact(n);
}
@ -403,7 +414,7 @@ bool tipc_node_update_dest(struct tipc_node *n, struct tipc_bearer *b,
}
memcpy(&l->media_addr, maddr, sizeof(*maddr));
memcpy(curr, maddr, sizeof(*maddr));
tipc_link_reset(l);
tipc_node_link_down(n, b->identity);
return true;
}
@ -418,7 +429,7 @@ void tipc_node_delete_links(struct net *net, int bearer_id)
tipc_node_lock(n);
l = n->links[bearer_id].link;
if (l) {
tipc_link_reset(l);
tipc_node_link_down(n, bearer_id);
n->links[bearer_id].link = NULL;
n->link_cnt--;
}
@ -439,8 +450,9 @@ static void tipc_node_reset_links(struct tipc_node *n)
tipc_addr_string_fill(addr_string, n->addr));
for (i = 0; i < MAX_BEARERS; i++) {
if (n->links[i].link)
tipc_link_reset(n->links[i].link);
if (!n->links[i].link)
continue;
tipc_node_link_down(n, i);
}
tipc_node_unlock(n);
}
@ -837,7 +849,7 @@ int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
if (likely(l))
rc = tipc_link_xmit(l, list, &xmitq);
if (unlikely(rc == -ENOBUFS))
tipc_link_reset(l);
tipc_node_link_down(n, bearer_id);
tipc_node_unlock(n);
tipc_node_put(n);
}
@ -902,7 +914,7 @@ static void tipc_node_tnl_init(struct tipc_node *n, int bearer_id,
if (msg_type(hdr) == FAILOVER_MSG) {
if (tipc_link_is_up(pl)) {
tipc_link_reset(pl);
tipc_node_link_down(n, pb_id);
pl->exec_mode = TIPC_LINK_BLOCKED;
}
}
@ -978,7 +990,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
if (unlikely(rc & TIPC_LINK_UP_EVT))
tipc_node_link_up(n, bearer_id);
if (unlikely(rc & TIPC_LINK_DOWN_EVT))
tipc_link_reset(l);
tipc_node_link_down(n, bearer_id);
skb = NULL;
unlock:
tipc_node_unlock(n);