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tipc: merge link->exec_mode and link->state into one FSM
Until now, we have been handling link failover and synchronization
by using an additional link state variable, "exec_mode". This variable
is not independent of the link FSM state, something causing a risk of
inconsistencies, apart from the fact that it clutters the code.
The conditions are now in place to define a new link FSM that covers
all existing use cases, including failover and synchronization, and
eliminate the "exec_mode" field altogether. The FSM must also support
non-atomic resetting of links, which will be introduced later.
The new link FSM is shown below, with 7 states and 8 events.
Only events leading to state change are shown as edges.
+------------------------------------+
|RESET_EVT |
| |
| +--------------+
| +-----------------| SYNCHING |-----------------+
| |FAILURE_EVT +--------------+ PEER_RESET_EVT|
| | A | |
| | | | |
| | | | |
| | |SYNCH_ |SYNCH_ |
| | |BEGIN_EVT |END_EVT |
| | | | |
| V | V V
| +-------------+ +--------------+ +------------+
| | RESETTING |<---------| ESTABLISHED |--------->| PEER_RESET |
| +-------------+ FAILURE_ +--------------+ PEER_ +------------+
| | EVT | A RESET_EVT |
| | | | |
| | | | |
| | +--------------+ | |
| RESET_EVT| |RESET_EVT |ESTABLISH_EVT |
| | | | |
| | | | |
| V V | |
| +-------------+ +--------------+ RESET_EVT|
+--->| RESET |--------->| ESTABLISHING |<----------------+
+-------------+ PEER_ +--------------+
| A RESET_EVT |
| | |
| | |
|FAILOVER_ |FAILOVER_ |FAILOVER_
|BEGIN_EVT |END_EVT |BEGIN_EVT
| | |
V | |
+-------------+ |
| FAILINGOVER |<----------------+
+-------------+
These changes are fully backwards compatible.
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
David S. Miller
parent
5045f7b900
commit
662921cd0a
360
net/tipc/link.c
360
net/tipc/link.c
@ -50,7 +50,6 @@
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*/
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static const char *link_co_err = "Link tunneling error, ";
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static const char *link_rst_msg = "Resetting link ";
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static const char *link_unk_evt = "Unknown link event ";
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static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
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[TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
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@ -85,46 +84,23 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
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*/
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#define WILDCARD_SESSION 0x10000
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/* State value stored in 'failover_pkts'
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*/
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#define FIRST_FAILOVER 0xffffu
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/* Link FSM states and events:
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/* Link FSM states:
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*/
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enum {
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TIPC_LINK_WORKING,
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TIPC_LINK_PROBING,
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TIPC_LINK_RESETTING,
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TIPC_LINK_ESTABLISHING
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};
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enum {
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PEER_RESET_EVT = RESET_MSG,
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ACTIVATE_EVT = ACTIVATE_MSG,
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TRAFFIC_EVT, /* Any other valid msg from peer */
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SILENCE_EVT /* Peer was silent during last timer interval*/
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LINK_ESTABLISHED = 0xe,
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LINK_ESTABLISHING = 0xe << 4,
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LINK_RESET = 0x1 << 8,
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LINK_RESETTING = 0x2 << 12,
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LINK_PEER_RESET = 0xd << 16,
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LINK_FAILINGOVER = 0xf << 20,
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LINK_SYNCHING = 0xc << 24
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};
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/* Link FSM state checking routines
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*/
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static int link_working(struct tipc_link *l)
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static int link_is_up(struct tipc_link *l)
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{
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return l->state == TIPC_LINK_WORKING;
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}
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static int link_probing(struct tipc_link *l)
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{
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return l->state == TIPC_LINK_PROBING;
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}
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static int link_resetting(struct tipc_link *l)
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{
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return l->state == TIPC_LINK_RESETTING;
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}
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static int link_establishing(struct tipc_link *l)
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{
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return l->state == TIPC_LINK_ESTABLISHING;
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return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
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}
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static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
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@ -141,11 +117,29 @@ static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
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/*
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* Simple non-static link routines (i.e. referenced outside this file)
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*/
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int tipc_link_is_up(struct tipc_link *l_ptr)
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bool tipc_link_is_up(struct tipc_link *l)
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{
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if (!l_ptr)
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return 0;
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return link_working(l_ptr) || link_probing(l_ptr);
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return link_is_up(l);
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}
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bool tipc_link_is_reset(struct tipc_link *l)
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{
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return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
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}
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bool tipc_link_is_synching(struct tipc_link *l)
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{
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return l->state == LINK_SYNCHING;
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}
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bool tipc_link_is_failingover(struct tipc_link *l)
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{
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return l->state == LINK_FAILINGOVER;
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}
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bool tipc_link_is_blocked(struct tipc_link *l)
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{
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return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
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}
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int tipc_link_is_active(struct tipc_link *l)
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@ -210,7 +204,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
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l_ptr->tolerance = b_ptr->tolerance;
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l_ptr->snd_nxt = 1;
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l_ptr->rcv_nxt = 1;
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l_ptr->state = TIPC_LINK_RESETTING;
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l_ptr->state = LINK_RESET;
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l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
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msg = l_ptr->pmsg;
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@ -265,120 +259,159 @@ void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
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* tipc_link_fsm_evt - link finite state machine
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* @l: pointer to link
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* @evt: state machine event to be processed
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* @xmitq: queue to prepend created protocol message, if any
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*/
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static int tipc_link_fsm_evt(struct tipc_link *l, int evt,
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struct sk_buff_head *xmitq)
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int tipc_link_fsm_evt(struct tipc_link *l, int evt)
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{
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int rc = 0;
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struct tipc_link *pl;
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enum {
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LINK_RESET = 1,
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LINK_ACTIVATE = (1 << 1),
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SND_PROBE = (1 << 2),
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SND_STATE = (1 << 3),
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SND_RESET = (1 << 4),
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SND_ACTIVATE = (1 << 5),
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SND_BCAST_SYNC = (1 << 6)
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} actions = 0;
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if (l->exec_mode == TIPC_LINK_BLOCKED)
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return rc;
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switch (l->state) {
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case TIPC_LINK_WORKING:
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case LINK_RESETTING:
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switch (evt) {
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case TRAFFIC_EVT:
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case ACTIVATE_EVT:
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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break;
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case SILENCE_EVT:
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l->state = TIPC_LINK_PROBING;
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actions |= SND_PROBE;
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break;
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case PEER_RESET_EVT:
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actions |= LINK_RESET | SND_ACTIVATE;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_FAILURE_EVT:
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILOVER_END_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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pr_debug("%s%u WORKING\n", link_unk_evt, evt);
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goto illegal_evt;
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}
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break;
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case TIPC_LINK_PROBING:
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case LINK_RESET:
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switch (evt) {
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case TRAFFIC_EVT:
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case ACTIVATE_EVT:
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l->state = TIPC_LINK_WORKING;
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case LINK_PEER_RESET_EVT:
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l->state = LINK_ESTABLISHING;
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break;
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case PEER_RESET_EVT:
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actions |= LINK_RESET | SND_ACTIVATE;
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break;
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case SILENCE_EVT:
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if (l->silent_intv_cnt <= l->abort_limit) {
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actions |= SND_PROBE;
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break;
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}
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actions |= LINK_RESET | SND_RESET;
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case LINK_FAILOVER_BEGIN_EVT:
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l->state = LINK_FAILINGOVER;
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case LINK_FAILURE_EVT:
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case LINK_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILOVER_END_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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pr_err("%s%u PROBING\n", link_unk_evt, evt);
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goto illegal_evt;
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}
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break;
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case TIPC_LINK_RESETTING:
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case LINK_PEER_RESET:
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switch (evt) {
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case TRAFFIC_EVT:
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case LINK_RESET_EVT:
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l->state = LINK_ESTABLISHING;
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break;
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case ACTIVATE_EVT:
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pl = node_active_link(l->owner, 0);
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if (pl && link_probing(pl))
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break;
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l->state = TIPC_LINK_WORKING;
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actions |= LINK_ACTIVATE;
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if (!l->owner->working_links)
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actions |= SND_BCAST_SYNC;
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break;
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case PEER_RESET_EVT:
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l->state = TIPC_LINK_ESTABLISHING;
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actions |= SND_ACTIVATE;
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break;
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case SILENCE_EVT:
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actions |= SND_RESET;
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case LINK_PEER_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILURE_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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pr_err("%s%u in RESETTING\n", link_unk_evt, evt);
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goto illegal_evt;
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}
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break;
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case TIPC_LINK_ESTABLISHING:
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case LINK_FAILINGOVER:
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switch (evt) {
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case TRAFFIC_EVT:
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case ACTIVATE_EVT:
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pl = node_active_link(l->owner, 0);
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if (pl && link_probing(pl))
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break;
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l->state = TIPC_LINK_WORKING;
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actions |= LINK_ACTIVATE;
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if (!l->owner->working_links)
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actions |= SND_BCAST_SYNC;
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case LINK_FAILOVER_END_EVT:
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l->state = LINK_RESET;
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break;
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case PEER_RESET_EVT:
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break;
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case SILENCE_EVT:
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actions |= SND_ACTIVATE;
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case LINK_PEER_RESET_EVT:
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case LINK_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILURE_EVT:
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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pr_err("%s%u ESTABLISHING\n", link_unk_evt, evt);
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goto illegal_evt;
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}
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break;
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case LINK_ESTABLISHING:
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switch (evt) {
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case LINK_ESTABLISH_EVT:
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l->state = LINK_ESTABLISHED;
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rc |= TIPC_LINK_UP_EVT;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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l->state = LINK_FAILINGOVER;
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break;
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case LINK_PEER_RESET_EVT:
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case LINK_RESET_EVT:
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case LINK_FAILURE_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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break;
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case LINK_SYNCH_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_ESTABLISHED:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_FAILURE_EVT:
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l->state = LINK_RESETTING;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_ESTABLISH_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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l->state = LINK_SYNCHING;
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break;
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case LINK_SYNCH_END_EVT:
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_SYNCHING:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_FAILURE_EVT:
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l->state = LINK_RESETTING;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_ESTABLISH_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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break;
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case LINK_SYNCH_END_EVT:
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l->state = LINK_ESTABLISHED;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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default:
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pr_err("Unknown link state %u/%u\n", l->state, evt);
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pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
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}
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/* Perform actions as decided by FSM */
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if (actions & LINK_RESET) {
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l->exec_mode = TIPC_LINK_BLOCKED;
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rc = TIPC_LINK_DOWN_EVT;
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}
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if (actions & LINK_ACTIVATE)
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rc = TIPC_LINK_UP_EVT;
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return rc;
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illegal_evt:
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pr_err("Illegal FSM event %x in state %x on link %s\n",
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evt, l->state, l->name);
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return rc;
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}
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@ -432,12 +465,11 @@ int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
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bool xmit = false;
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bool prb = false;
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if (l->exec_mode == TIPC_LINK_BLOCKED)
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return rc;
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link_profile_stats(l);
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if (l->state == TIPC_LINK_WORKING) {
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switch (l->state) {
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case LINK_ESTABLISHED:
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case LINK_SYNCHING:
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if (!l->silent_intv_cnt) {
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if (tipc_bclink_acks_missing(l->owner))
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xmit = true;
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@ -445,17 +477,26 @@ int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
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xmit = true;
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prb = true;
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} else {
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l->exec_mode = TIPC_LINK_BLOCKED;
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rc |= TIPC_LINK_DOWN_EVT;
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rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
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}
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l->silent_intv_cnt++;
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} else if (l->state == TIPC_LINK_RESETTING) {
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break;
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case LINK_RESET:
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xmit = true;
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mtyp = RESET_MSG;
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} else if (l->state == TIPC_LINK_ESTABLISHING) {
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break;
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case LINK_ESTABLISHING:
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xmit = true;
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mtyp = ACTIVATE_MSG;
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break;
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case LINK_RESETTING:
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case LINK_PEER_RESET:
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case LINK_FAILINGOVER:
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break;
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default:
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break;
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}
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if (xmit)
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tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
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@ -559,7 +600,7 @@ void tipc_link_reset(struct tipc_link *l)
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{
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struct tipc_node *owner = l->owner;
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l->state = TIPC_LINK_RESETTING;
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tipc_link_fsm_evt(l, LINK_RESET_EVT);
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/* Link is down, accept any session */
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l->peer_session = WILDCARD_SESSION;
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@ -902,8 +943,7 @@ static int tipc_link_retransm(struct tipc_link *l, int retransm,
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l->stale_count = 1;
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} else if (++l->stale_count > 100) {
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link_retransmit_failure(l, skb);
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l->exec_mode = TIPC_LINK_BLOCKED;
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return TIPC_LINK_DOWN_EVT;
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return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
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}
|
||||
skb_queue_walk(&l->transmq, skb) {
|
||||
if (!retransm)
|
||||
@ -1002,25 +1042,23 @@ static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb)
|
||||
l->stats.recv_bundled += msg_msgcnt(hdr);
|
||||
while (tipc_msg_extract(skb, &iskb, &pos))
|
||||
tipc_data_input(l, iskb);
|
||||
return rc;
|
||||
return 0;
|
||||
} else if (usr == MSG_FRAGMENTER) {
|
||||
l->stats.recv_fragments++;
|
||||
if (tipc_buf_append(reasm_skb, &skb)) {
|
||||
l->stats.recv_fragmented++;
|
||||
tipc_data_input(l, skb);
|
||||
} else if (!*reasm_skb) {
|
||||
l->exec_mode = TIPC_LINK_BLOCKED;
|
||||
l->state = TIPC_LINK_RESETTING;
|
||||
rc = TIPC_LINK_DOWN_EVT;
|
||||
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
|
||||
}
|
||||
return rc;
|
||||
return 0;
|
||||
} else if (usr == BCAST_PROTOCOL) {
|
||||
tipc_link_sync_rcv(node, skb);
|
||||
return rc;
|
||||
return 0;
|
||||
}
|
||||
drop:
|
||||
kfree_skb(skb);
|
||||
return rc;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
|
||||
@ -1068,9 +1106,9 @@ int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
continue;
|
||||
}
|
||||
|
||||
if (unlikely(!link_working(l))) {
|
||||
rc = tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
|
||||
if (!link_working(l)) {
|
||||
if (unlikely(!link_is_up(l))) {
|
||||
rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
|
||||
if (!link_is_up(l)) {
|
||||
kfree_skb(__skb_dequeue(arrvq));
|
||||
return rc;
|
||||
}
|
||||
@ -1192,7 +1230,7 @@ static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
|
||||
int node_up = l->owner->bclink.recv_permitted;
|
||||
|
||||
/* Don't send protocol message during reset or link failover */
|
||||
if (l->exec_mode == TIPC_LINK_BLOCKED)
|
||||
if (tipc_link_is_blocked(l))
|
||||
return;
|
||||
|
||||
msg_set_type(hdr, mtyp);
|
||||
@ -1302,7 +1340,6 @@ tnl:
|
||||
tnl->drop_point = l->rcv_nxt;
|
||||
tnl->failover_reasm_skb = l->reasm_buf;
|
||||
l->reasm_buf = NULL;
|
||||
l->exec_mode = TIPC_LINK_BLOCKED;
|
||||
}
|
||||
}
|
||||
|
||||
@ -1323,7 +1360,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
char *if_name;
|
||||
int rc = 0;
|
||||
|
||||
if (l->exec_mode == TIPC_LINK_BLOCKED)
|
||||
if (tipc_link_is_blocked(l))
|
||||
goto exit;
|
||||
|
||||
if (link_own_addr(l) > msg_prevnode(hdr))
|
||||
@ -1337,6 +1374,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
(l->peer_session != WILDCARD_SESSION))
|
||||
break;
|
||||
/* fall thru' */
|
||||
|
||||
case ACTIVATE_MSG:
|
||||
|
||||
/* Complete own link name with peer's interface name */
|
||||
@ -1355,13 +1393,20 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
|
||||
l->priority = peers_prio;
|
||||
|
||||
if (msg_type(hdr) == RESET_MSG) {
|
||||
rc |= tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
|
||||
} else if (!link_is_up(l)) {
|
||||
tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
|
||||
rc |= tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
|
||||
}
|
||||
l->peer_session = msg_session(hdr);
|
||||
l->peer_bearer_id = msg_bearer_id(hdr);
|
||||
rc = tipc_link_fsm_evt(l, msg_type(hdr), xmitq);
|
||||
if (l->mtu > msg_max_pkt(hdr))
|
||||
l->mtu = msg_max_pkt(hdr);
|
||||
break;
|
||||
|
||||
case STATE_MSG:
|
||||
|
||||
/* Update own tolerance if peer indicates a non-zero value */
|
||||
if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
|
||||
l->tolerance = peers_tol;
|
||||
@ -1370,11 +1415,11 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
l->stats.recv_states++;
|
||||
if (msg_probe(hdr))
|
||||
l->stats.recv_probes++;
|
||||
rc = tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
|
||||
if (!tipc_link_is_up(l))
|
||||
rc = tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
|
||||
if (!link_is_up(l))
|
||||
break;
|
||||
|
||||
/* Has peer sent packets we haven't received yet ? */
|
||||
/* Send NACK if peer has sent pkts we haven't received yet */
|
||||
if (more(peers_snd_nxt, l->rcv_nxt))
|
||||
rcvgap = peers_snd_nxt - l->rcv_nxt;
|
||||
if (rcvgap || (msg_probe(hdr)))
|
||||
@ -1387,6 +1432,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
||||
rc = tipc_link_retransm(l, nacked_gap, xmitq);
|
||||
l->stats.recv_nacks++;
|
||||
}
|
||||
|
||||
tipc_link_advance_backlog(l, xmitq);
|
||||
if (unlikely(!skb_queue_empty(&l->wakeupq)))
|
||||
link_prepare_wakeup(l);
|
||||
@ -1463,19 +1509,7 @@ static void link_print(struct tipc_link *l, const char *str)
|
||||
u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt;
|
||||
u16 tail = l->snd_nxt - 1;
|
||||
|
||||
pr_info("%s Link <%s>:", str, l->name);
|
||||
|
||||
if (link_probing(l))
|
||||
pr_cont(":P\n");
|
||||
else if (link_establishing(l))
|
||||
pr_cont(":E\n");
|
||||
else if (link_resetting(l))
|
||||
pr_cont(":R\n");
|
||||
else if (link_working(l))
|
||||
pr_cont(":W\n");
|
||||
else
|
||||
pr_cont("\n");
|
||||
|
||||
pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
|
||||
pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
|
||||
skb_queue_len(&l->transmq), head, tail,
|
||||
skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
|
||||
|
||||
@ -49,13 +49,17 @@
|
||||
*/
|
||||
#define INVALID_LINK_SEQ 0x10000
|
||||
|
||||
|
||||
/* Link endpoint receive states
|
||||
/* Link FSM events:
|
||||
*/
|
||||
enum {
|
||||
TIPC_LINK_OPEN,
|
||||
TIPC_LINK_BLOCKED,
|
||||
TIPC_LINK_TUNNEL
|
||||
LINK_ESTABLISH_EVT = 0xec1ab1e,
|
||||
LINK_PEER_RESET_EVT = 0x9eed0e,
|
||||
LINK_FAILURE_EVT = 0xfa110e,
|
||||
LINK_RESET_EVT = 0x10ca1d0e,
|
||||
LINK_FAILOVER_BEGIN_EVT = 0xfa110bee,
|
||||
LINK_FAILOVER_END_EVT = 0xfa110ede,
|
||||
LINK_SYNCH_BEGIN_EVT = 0xc1ccbee,
|
||||
LINK_SYNCH_END_EVT = 0xc1ccede
|
||||
};
|
||||
|
||||
/* Events returned from link at packet reception or at timeout
|
||||
@ -120,7 +124,6 @@ struct tipc_stats {
|
||||
* @pmsg: convenience pointer to "proto_msg" field
|
||||
* @priority: current link priority
|
||||
* @net_plane: current link network plane ('A' through 'H')
|
||||
* @exec_mode: transmit/receive mode for link endpoint instance
|
||||
* @backlog_limit: backlog queue congestion thresholds (indexed by importance)
|
||||
* @exp_msg_count: # of tunnelled messages expected during link changeover
|
||||
* @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
|
||||
@ -155,7 +158,7 @@ struct tipc_link {
|
||||
u32 tolerance;
|
||||
unsigned long keepalive_intv;
|
||||
u32 abort_limit;
|
||||
int state;
|
||||
u32 state;
|
||||
u32 silent_intv_cnt;
|
||||
struct {
|
||||
unchar hdr[INT_H_SIZE];
|
||||
@ -166,7 +169,6 @@ struct tipc_link {
|
||||
char net_plane;
|
||||
|
||||
/* Failover/synch */
|
||||
u8 exec_mode;
|
||||
u16 drop_point;
|
||||
struct sk_buff *failover_reasm_skb;
|
||||
|
||||
@ -214,8 +216,13 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
|
||||
int mtyp, struct sk_buff_head *xmitq);
|
||||
void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
|
||||
struct sk_buff_head *xmitq);
|
||||
int tipc_link_fsm_evt(struct tipc_link *l, int evt);
|
||||
void tipc_link_reset_fragments(struct tipc_link *l_ptr);
|
||||
int tipc_link_is_up(struct tipc_link *l_ptr);
|
||||
bool tipc_link_is_up(struct tipc_link *l);
|
||||
bool tipc_link_is_reset(struct tipc_link *l);
|
||||
bool tipc_link_is_synching(struct tipc_link *l);
|
||||
bool tipc_link_is_failingover(struct tipc_link *l);
|
||||
bool tipc_link_is_blocked(struct tipc_link *l);
|
||||
int tipc_link_is_active(struct tipc_link *l_ptr);
|
||||
void tipc_link_purge_queues(struct tipc_link *l_ptr);
|
||||
void tipc_link_purge_backlog(struct tipc_link *l);
|
||||
|
||||
@ -334,7 +334,6 @@ static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
|
||||
if (!ol) {
|
||||
*slot0 = bearer_id;
|
||||
*slot1 = bearer_id;
|
||||
nl->exec_mode = TIPC_LINK_OPEN;
|
||||
tipc_link_build_bcast_sync_msg(nl, xmitq);
|
||||
node_established_contact(n);
|
||||
return;
|
||||
@ -368,7 +367,7 @@ static void tipc_node_link_down(struct tipc_node *n, int bearer_id)
|
||||
struct sk_buff_head xmitq;
|
||||
|
||||
l = n->links[bearer_id].link;
|
||||
if (!l || !tipc_link_is_up(l))
|
||||
if (!l || tipc_link_is_reset(l))
|
||||
return;
|
||||
|
||||
__skb_queue_head_init(&xmitq);
|
||||
@ -414,6 +413,7 @@ static void tipc_node_link_down(struct tipc_node *n, int bearer_id)
|
||||
n->sync_point = tnl->rcv_nxt + (U16_MAX / 2 - 1);
|
||||
tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, &xmitq);
|
||||
tipc_link_reset(l);
|
||||
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
|
||||
tipc_bearer_xmit(n->net, tnl->bearer_id, &xmitq, maddr);
|
||||
}
|
||||
|
||||
@ -749,7 +749,7 @@ static void node_lost_contact(struct tipc_node *n_ptr)
|
||||
struct tipc_link *l_ptr = n_ptr->links[i].link;
|
||||
if (!l_ptr)
|
||||
continue;
|
||||
l_ptr->exec_mode = TIPC_LINK_OPEN;
|
||||
tipc_link_fsm_evt(l_ptr, LINK_FAILOVER_END_EVT);
|
||||
kfree_skb(l_ptr->failover_reasm_skb);
|
||||
l_ptr->failover_reasm_skb = NULL;
|
||||
tipc_link_reset_fragments(l_ptr);
|
||||
@ -989,7 +989,7 @@ int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
|
||||
* Returns true if state is ok, otherwise consumes buffer and returns false
|
||||
*/
|
||||
static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
|
||||
int bearer_id)
|
||||
int bearer_id, struct sk_buff_head *xmitq)
|
||||
{
|
||||
struct tipc_msg *hdr = buf_msg(skb);
|
||||
int usr = msg_user(hdr);
|
||||
@ -1042,42 +1042,47 @@ static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
|
||||
/* Initiate or update failover mode if applicable */
|
||||
if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
|
||||
syncpt = oseqno + exp_pkts - 1;
|
||||
if (pl && tipc_link_is_up(pl)) {
|
||||
if (pl && tipc_link_is_up(pl))
|
||||
tipc_node_link_down(n, pl->bearer_id);
|
||||
pl->exec_mode = TIPC_LINK_BLOCKED;
|
||||
}
|
||||
|
||||
/* If pkts arrive out of order, use lowest calculated syncpt */
|
||||
if (less(syncpt, n->sync_point))
|
||||
n->sync_point = syncpt;
|
||||
}
|
||||
|
||||
/* Open parallel link when tunnel link reaches synch point */
|
||||
if ((n->state == NODE_FAILINGOVER) && (more(rcv_nxt, n->sync_point))) {
|
||||
if ((n->state == NODE_FAILINGOVER) && !tipc_link_is_failingover(l)) {
|
||||
if (!more(rcv_nxt, n->sync_point))
|
||||
return true;
|
||||
tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
|
||||
if (pl)
|
||||
pl->exec_mode = TIPC_LINK_OPEN;
|
||||
tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
|
||||
return true;
|
||||
}
|
||||
|
||||
/* Initiate or update synch mode if applicable */
|
||||
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG)) {
|
||||
syncpt = iseqno + exp_pkts - 1;
|
||||
if (!tipc_link_is_up(l)) {
|
||||
tipc_link_fsm_evt(l, LINK_ESTABLISH_EVT);
|
||||
tipc_node_link_up(n, bearer_id, xmitq);
|
||||
}
|
||||
if (n->state == SELF_UP_PEER_UP) {
|
||||
n->sync_point = syncpt;
|
||||
tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
|
||||
tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
|
||||
}
|
||||
l->exec_mode = TIPC_LINK_TUNNEL;
|
||||
if (less(syncpt, n->sync_point))
|
||||
n->sync_point = syncpt;
|
||||
}
|
||||
|
||||
/* Open tunnel link when parallel link reaches synch point */
|
||||
if ((n->state == NODE_SYNCHING) && (l->exec_mode == TIPC_LINK_TUNNEL)) {
|
||||
if ((n->state == NODE_SYNCHING) && tipc_link_is_synching(l)) {
|
||||
if (pl)
|
||||
dlv_nxt = mod(pl->rcv_nxt - skb_queue_len(pl->inputq));
|
||||
if (!pl || more(dlv_nxt, n->sync_point)) {
|
||||
tipc_link_fsm_evt(l, LINK_SYNCH_END_EVT);
|
||||
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
|
||||
l->exec_mode = TIPC_LINK_OPEN;
|
||||
return true;
|
||||
}
|
||||
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
|
||||
@ -1143,7 +1148,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
|
||||
tipc_bclink_acknowledge(n, msg_bcast_ack(hdr));
|
||||
|
||||
/* Check and if necessary update node state */
|
||||
if (likely(tipc_node_check_state(n, skb, bearer_id))) {
|
||||
if (likely(tipc_node_check_state(n, skb, bearer_id, &xmitq))) {
|
||||
rc = tipc_link_rcv(le->link, skb, &xmitq);
|
||||
skb = NULL;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user