tipc: send out join messages as soon as new member is discovered
When a socket is joining a group, we look up in the binding table to
find if there are already other members of the group present. This is
used for being able to return EAGAIN instead of EHOSTUNREACH if the
user proceeds directly to a send attempt.
However, the information in the binding table can be used to directly
set the created member in state MBR_PUBLISHED and send a JOIN message
to the peer, instead of waiting for a topology PUBLISH event to do this.
When there are many members in a group, the propagation time for such
events can be significant, and we can save time during the join
operation if we use the initial lookup result fully.
In this commit, we eliminate the member state MBR_DISCOVERED which has
been the result of the initial lookup, and do instead go directly to
MBR_PUBLISHED, which initiates the setup.
After this change, the tipc_member FSM looks as follows:
+-----------+
---->| PUBLISHED |-----------------------------------------------+
PUB- +-----------+ LEAVE/WITHRAW |
LISH |JOIN |
| +-------------------------------------------+ |
| | LEAVE/WITHDRAW | |
| | +------------+ | |
| | +----------->| PENDING |---------+ | |
| | |msg/maxactv +-+---+------+ LEAVE/ | | |
| | | | | WITHDRAW | | |
| | | +----------+ | | | |
| | | |revert/maxactv| | | |
| | | V V V V V
| +----------+ msg +------------+ +-----------+
+-->| JOINED |------>| ACTIVE |------>| LEAVING |--->
| +----------+ +--- -+------+ LEAVE/+-----------+DOWN
| A A | WITHDRAW A A A EVT
| | | |RECLAIM | | |
| | |REMIT V | | |
| | |== adv +------------+ | | |
| | +---------| RECLAIMING |--------+ | |
| | +-----+------+ LEAVE/ | |
| | |REMIT WITHDRAW | |
| | |< adv | |
| |msg/ V LEAVE/ | |
| |adv==ADV_IDLE+------------+ WITHDRAW | |
| +-------------| REMITTED |------------+ |
| +------------+ |
|PUBLISH |
JOIN +-----------+ LEAVE/WITHDRAW |
---->| JOINING |-----------------------------------------------+
+-----------+
Acked-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>
diff --git a/net/tipc/group.c b/net/tipc/group.c
index bdc54be..6ca07f0 100644
--- a/net/tipc/group.c
+++ b/net/tipc/group.c
@@ -49,7 +49,6 @@
#define ADV_ACTIVE (ADV_UNIT * 12)
enum mbr_state {
- MBR_DISCOVERED,
MBR_JOINING,
MBR_PUBLISHED,
MBR_JOINED,
@@ -141,7 +140,7 @@
static bool tipc_group_is_sender(struct tipc_member *m)
{
- return m && m->state >= MBR_JOINED;
+ return m && m->state != MBR_JOINING && m->state != MBR_PUBLISHED;
}
u32 tipc_group_exclude(struct tipc_group *grp)
@@ -184,6 +183,21 @@
return NULL;
}
+void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcvbuf)
+{
+ struct rb_root *tree = &grp->members;
+ struct tipc_member *m, *tmp;
+ struct sk_buff_head xmitq;
+
+ skb_queue_head_init(&xmitq);
+ rbtree_postorder_for_each_entry_safe(m, tmp, tree, tree_node) {
+ tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, &xmitq);
+ tipc_group_update_member(m, 0);
+ }
+ tipc_node_distr_xmit(net, &xmitq);
+ *sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
+}
+
void tipc_group_delete(struct net *net, struct tipc_group *grp)
{
struct rb_root *tree = &grp->members;
@@ -274,7 +288,7 @@
static struct tipc_member *tipc_group_create_member(struct tipc_group *grp,
u32 node, u32 port,
- int state)
+ u32 instance, int state)
{
struct tipc_member *m;
@@ -287,6 +301,7 @@
m->group = grp;
m->node = node;
m->port = port;
+ m->instance = instance;
m->bc_acked = grp->bc_snd_nxt - 1;
grp->member_cnt++;
tipc_group_add_to_tree(grp, m);
@@ -295,9 +310,10 @@
return m;
}
-void tipc_group_add_member(struct tipc_group *grp, u32 node, u32 port)
+void tipc_group_add_member(struct tipc_group *grp, u32 node,
+ u32 port, u32 instance)
{
- tipc_group_create_member(grp, node, port, MBR_DISCOVERED);
+ tipc_group_create_member(grp, node, port, instance, MBR_PUBLISHED);
}
static void tipc_group_delete_member(struct tipc_group *grp,
@@ -623,7 +639,6 @@
tipc_group_proto_xmit(grp, pm, GRP_ADV_MSG, xmitq);
break;
case MBR_RECLAIMING:
- case MBR_DISCOVERED:
case MBR_JOINING:
case MBR_LEAVING:
default:
@@ -721,26 +736,26 @@
case GRP_JOIN_MSG:
if (!m)
m = tipc_group_create_member(grp, node, port,
- MBR_JOINING);
+ 0, MBR_JOINING);
if (!m)
return;
m->bc_syncpt = msg_grp_bc_syncpt(hdr);
m->bc_rcv_nxt = m->bc_syncpt;
m->window += msg_adv_win(hdr);
- /* Wait until PUBLISH event is received */
- if (m->state == MBR_DISCOVERED) {
- m->state = MBR_JOINING;
- } else if (m->state == MBR_PUBLISHED) {
- m->state = MBR_JOINED;
- *usr_wakeup = true;
- m->usr_pending = false;
- tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
- tipc_group_create_event(grp, m, TIPC_PUBLISHED,
- m->bc_syncpt, inputq);
- }
+ /* Wait until PUBLISH event is received if necessary */
+ if (m->state != MBR_PUBLISHED)
+ return;
+
+ /* Member can be taken into service */
+ m->state = MBR_JOINED;
+ *usr_wakeup = true;
+ m->usr_pending = false;
list_del_init(&m->small_win);
tipc_group_update_member(m, 0);
+ tipc_group_proto_xmit(grp, m, GRP_ADV_MSG, xmitq);
+ tipc_group_create_event(grp, m, TIPC_PUBLISHED,
+ m->bc_syncpt, inputq);
return;
case GRP_LEAVE_MSG:
if (!m)
@@ -844,30 +859,36 @@
m = tipc_group_find_member(grp, node, port);
- if (event == TIPC_PUBLISHED) {
- if (!m)
- m = tipc_group_create_member(grp, node, port,
- MBR_DISCOVERED);
- if (!m)
- return;
-
- m->instance = instance;
-
- /* Hold back event if JOIN message not yet received */
- if (m->state == MBR_DISCOVERED) {
- m->state = MBR_PUBLISHED;
- } else {
- tipc_group_create_event(grp, m, TIPC_PUBLISHED,
- m->bc_syncpt, inputq);
- m->state = MBR_JOINED;
- *usr_wakeup = true;
- m->usr_pending = false;
+ switch (event) {
+ case TIPC_PUBLISHED:
+ /* Send and wait for arrival of JOIN message if necessary */
+ if (!m) {
+ m = tipc_group_create_member(grp, node, port, instance,
+ MBR_PUBLISHED);
+ if (!m)
+ break;
+ tipc_group_update_member(m, 0);
+ tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
+ break;
}
- tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
+
+ if (m->state != MBR_JOINING)
+ break;
+
+ /* Member can be taken into service */
+ m->instance = instance;
+ m->state = MBR_JOINED;
+ *usr_wakeup = true;
+ m->usr_pending = false;
+ list_del_init(&m->small_win);
tipc_group_update_member(m, 0);
- } else if (event == TIPC_WITHDRAWN) {
+ tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
+ tipc_group_create_event(grp, m, TIPC_PUBLISHED,
+ m->bc_syncpt, inputq);
+ break;
+ case TIPC_WITHDRAWN:
if (!m)
- return;
+ break;
*usr_wakeup = true;
m->usr_pending = false;
@@ -880,6 +901,9 @@
if (!tipc_node_is_up(net, node))
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_rcv_nxt, inputq);
+ break;
+ default:
+ break;
}
*sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
}
diff --git a/net/tipc/group.h b/net/tipc/group.h
index 5ffffd0..dee7947 100644
--- a/net/tipc/group.h
+++ b/net/tipc/group.h
@@ -44,8 +44,10 @@
struct tipc_group *tipc_group_create(struct net *net, u32 portid,
struct tipc_group_req *mreq);
+void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcv_buf);
void tipc_group_delete(struct net *net, struct tipc_group *grp);
-void tipc_group_add_member(struct tipc_group *grp, u32 node, u32 port);
+void tipc_group_add_member(struct tipc_group *grp, u32 node,
+ u32 port, u32 instance);
struct tipc_nlist *tipc_group_dests(struct tipc_group *grp);
void tipc_group_self(struct tipc_group *grp, struct tipc_name_seq *seq,
int *scope);
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index b3829bc..e04ab72 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -732,7 +732,7 @@
list_for_each_entry(p, &info->zone_list, zone_list) {
if (!tipc_in_scope(domain, p->node))
continue;
- tipc_group_add_member(grp, p->node, p->ref);
+ tipc_group_add_member(grp, p->node, p->ref, p->lower);
}
}
spin_unlock_bh(&seq->lock);
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 36744eb..e3a02f1f 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2757,10 +2757,10 @@
tipc_group_delete(net, grp);
tsk->group = NULL;
}
-
- /* Eliminate any risk that a broadcast overtakes the sent JOIN */
+ /* Eliminate any risk that a broadcast overtakes sent JOINs */
tsk->mc_method.rcast = true;
tsk->mc_method.mandatory = true;
+ tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
return rc;
}