summaryrefslogtreecommitdiffstats
path: root/net/tipc/link.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/tipc/link.c')
-rw-r--r--net/tipc/link.c98
1 files changed, 58 insertions, 40 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c
index c052437a7cfa..35a2da688db1 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -79,19 +79,49 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
/*
* Out-of-range value for link session numbers
*/
-#define INVALID_SESSION 0x10000
+#define WILDCARD_SESSION 0x10000
-/*
- * Link state events:
+/* State value stored in 'failover_pkts'
*/
-#define STARTING_EVT 856384768 /* link processing trigger */
-#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
-#define SILENCE_EVT 560817u /* timer dicovered silence from peer */
+#define FIRST_FAILOVER 0xffffu
-/*
- * State value stored in 'failover_pkts'
+/* Link FSM states and events:
*/
-#define FIRST_FAILOVER 0xffffu
+enum {
+ WORKING_WORKING,
+ WORKING_UNKNOWN,
+ RESET_RESET,
+ RESET_UNKNOWN
+};
+
+enum {
+ PEER_RESET_EVT = RESET_MSG,
+ ACTIVATE_EVT = ACTIVATE_MSG,
+ TRAFFIC_EVT, /* Any other valid msg from peer */
+ SILENCE_EVT /* Peer was silent during last timer interval*/
+};
+
+/* Link FSM state checking routines
+ */
+static int link_working_working(struct tipc_link *l)
+{
+ return l->state == WORKING_WORKING;
+}
+
+static int link_working_unknown(struct tipc_link *l)
+{
+ return l->state == WORKING_UNKNOWN;
+}
+
+static int link_reset_unknown(struct tipc_link *l)
+{
+ return l->state == RESET_UNKNOWN;
+}
+
+static int link_reset_reset(struct tipc_link *l)
+{
+ return l->state == RESET_RESET;
+}
static void link_handle_out_of_seq_msg(struct tipc_link *link,
struct sk_buff *skb);
@@ -268,7 +298,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
/* note: peer i/f name is updated by reset/activate message */
memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
l_ptr->owner = n_ptr;
- l_ptr->peer_session = INVALID_SESSION;
+ l_ptr->peer_session = WILDCARD_SESSION;
l_ptr->bearer_id = b_ptr->identity;
link_set_supervision_props(l_ptr, b_ptr->tolerance);
l_ptr->state = RESET_UNKNOWN;
@@ -297,8 +327,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
link_reset_statistics(l_ptr);
tipc_node_attach_link(n_ptr, l_ptr);
setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr);
- link_state_event(l_ptr, STARTING_EVT);
-
+ link_set_timer(l_ptr, l_ptr->keepalive_intv);
return l_ptr;
}
@@ -311,7 +340,6 @@ void tipc_link_delete(struct tipc_link *l)
tipc_link_reset(l);
if (del_timer(&l->timer))
tipc_link_put(l);
- l->flags |= LINK_STOPPED;
/* Delete link now, or when timer is finished: */
tipc_link_reset_fragments(l);
tipc_node_detach_link(l->owner, l);
@@ -438,7 +466,7 @@ void tipc_link_reset(struct tipc_link *l_ptr)
msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
/* Link is down, accept any session */
- l_ptr->peer_session = INVALID_SESSION;
+ l_ptr->peer_session = WILDCARD_SESSION;
/* Prepare for renewed mtu size negotiation */
l_ptr->mtu = l_ptr->advertised_mtu;
@@ -452,7 +480,7 @@ void tipc_link_reset(struct tipc_link *l_ptr)
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)) {
- l_ptr->flags |= LINK_FAILINGOVER;
+ l_ptr->exec_mode = TIPC_LINK_BLOCKED;
l_ptr->failover_checkpt = l_ptr->rcv_nxt;
pl->failover_pkts = FIRST_FAILOVER;
pl->failover_checkpt = l_ptr->rcv_nxt;
@@ -496,21 +524,14 @@ static void link_activate(struct tipc_link *link)
static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
{
struct tipc_link *other;
- unsigned long timer_intv = l_ptr->keepalive_intv;
-
- if (l_ptr->flags & LINK_STOPPED)
- return;
-
- if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
- return; /* Not yet. */
- if (l_ptr->flags & LINK_FAILINGOVER)
+ if (l_ptr->exec_mode == TIPC_LINK_BLOCKED)
return;
switch (l_ptr->state) {
case WORKING_WORKING:
switch (event) {
- case TRAFFIC_MSG_EVT:
+ case TRAFFIC_EVT:
case ACTIVATE_MSG:
l_ptr->silent_intv_cnt = 0;
break;
@@ -538,7 +559,7 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
break;
case WORKING_UNKNOWN:
switch (event) {
- case TRAFFIC_MSG_EVT:
+ case TRAFFIC_EVT:
case ACTIVATE_MSG:
l_ptr->state = WORKING_WORKING;
l_ptr->silent_intv_cnt = 0;
@@ -576,7 +597,7 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
break;
case RESET_UNKNOWN:
switch (event) {
- case TRAFFIC_MSG_EVT:
+ case TRAFFIC_EVT:
break;
case ACTIVATE_MSG:
other = node_active_link(l_ptr->owner, 0);
@@ -593,10 +614,6 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
1, 0, 0, 0);
break;
- case STARTING_EVT:
- l_ptr->flags |= LINK_STARTED;
- link_set_timer(l_ptr, timer_intv);
- break;
case SILENCE_EVT:
tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0);
break;
@@ -606,7 +623,7 @@ static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
break;
case RESET_RESET:
switch (event) {
- case TRAFFIC_MSG_EVT:
+ case TRAFFIC_EVT:
case ACTIVATE_MSG:
other = node_active_link(l_ptr->owner, 0);
if (other && link_working_unknown(other))
@@ -975,7 +992,7 @@ static bool link_synch(struct tipc_link *l)
if (skb_queue_len(pl->inputq) > post_synch)
return false;
synched:
- l->flags &= ~LINK_SYNCHING;
+ l->exec_mode = TIPC_LINK_OPEN;
return true;
}
@@ -1091,7 +1108,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
}
/* Traffic message. Conditionally activate link */
- link_state_event(l_ptr, TRAFFIC_MSG_EVT);
+ link_state_event(l_ptr, TRAFFIC_EVT);
if (link_working_working(l_ptr)) {
/* Re-insert buffer in front of queue */
@@ -1112,7 +1129,8 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
l_ptr->silent_intv_cnt = 0;
/* Synchronize with parallel link if applicable */
- if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) {
+ if (unlikely((l_ptr->exec_mode == TIPC_LINK_TUNNEL) &&
+ !msg_dup(msg))) {
if (!link_synch(l_ptr))
goto unlock;
}
@@ -1193,7 +1211,7 @@ static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
switch (msg_user(msg)) {
case TUNNEL_PROTOCOL:
if (msg_dup(msg)) {
- link->flags |= LINK_SYNCHING;
+ link->exec_mode = TIPC_LINK_TUNNEL;
link->synch_point = msg_seqno(msg_get_wrapped(msg));
kfree_skb(skb);
break;
@@ -1315,7 +1333,7 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
u16 last_rcv;
/* Don't send protocol message during link failover */
- if (l_ptr->flags & LINK_FAILINGOVER)
+ if (l_ptr->exec_mode == TIPC_LINK_BLOCKED)
return;
/* Abort non-RESET send if communication with node is prohibited */
@@ -1390,7 +1408,7 @@ static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
u32 msg_tol;
struct tipc_msg *msg = buf_msg(buf);
- if (l_ptr->flags & LINK_FAILINGOVER)
+ if (l_ptr->exec_mode == TIPC_LINK_BLOCKED)
goto exit;
if (l_ptr->net_plane != msg_net_plane(msg))
@@ -1401,7 +1419,7 @@ static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
case RESET_MSG:
if (!link_working_unknown(l_ptr) &&
- (l_ptr->peer_session != INVALID_SESSION)) {
+ (l_ptr->peer_session != WILDCARD_SESSION)) {
if (less_eq(msg_session(msg), l_ptr->peer_session))
break; /* duplicate or old reset: ignore */
}
@@ -1465,7 +1483,7 @@ static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
/* Record reception; force mismatch at next timeout: */
l_ptr->silent_intv_cnt = 0;
- link_state_event(l_ptr, TRAFFIC_MSG_EVT);
+ link_state_event(l_ptr, TRAFFIC_EVT);
l_ptr->stats.recv_states++;
if (link_reset_unknown(l_ptr))
break;
@@ -1704,7 +1722,7 @@ static bool tipc_link_failover_rcv(struct tipc_link *link,
}
exit:
if (!link->failover_pkts && pl)
- pl->flags &= ~LINK_FAILINGOVER;
+ pl->exec_mode = TIPC_LINK_OPEN;
kfree_skb(*skb);
*skb = iskb;
return *skb;
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-13 15:17:09 +0200