};
/*
- * Out-of-range value for link session numbers
+ * Interval between NACKs when packets arrive out of order
*/
-#define INVALID_SESSION 0x10000
-
+#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
/*
- * Link state events:
+ * Out-of-range value for link session numbers
*/
-#define STARTING_EVT 856384768 /* link processing trigger */
-#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
-#define SILENCE_EVT 560817u /* timer dicovered silence from peer */
+#define WILDCARD_SESSION 0x10000
-/*
- * State value stored in 'failover_pkts'
+/* State value stored in 'failover_pkts'
*/
#define FIRST_FAILOVER 0xffffu
-static void link_handle_out_of_seq_msg(struct tipc_link *link,
- struct sk_buff *skb);
-static void tipc_link_proto_rcv(struct tipc_link *link,
- struct sk_buff *skb);
-static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol);
-static void link_state_event(struct tipc_link *l_ptr, u32 event);
-static void link_reset_statistics(struct tipc_link *l_ptr);
-static void link_print(struct tipc_link *l_ptr, const char *str);
-static void tipc_link_sync_xmit(struct tipc_link *l);
-static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
-static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
-static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
-static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
-static void link_set_timer(struct tipc_link *link, unsigned long time);
-/*
- * Simple link routines
+/* Link FSM states and events:
*/
-static unsigned int align(unsigned int i)
+enum {
+ TIPC_LINK_WORKING,
+ TIPC_LINK_PROBING,
+ TIPC_LINK_RESETTING,
+ TIPC_LINK_ESTABLISHING
+};
+
+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(struct tipc_link *l)
{
- return (i + 3) & ~3u;
+ return l->state == TIPC_LINK_WORKING;
}
-static void tipc_link_release(struct kref *kref)
+static int link_probing(struct tipc_link *l)
{
- kfree(container_of(kref, struct tipc_link, ref));
+ return l->state == TIPC_LINK_PROBING;
}
-static void tipc_link_get(struct tipc_link *l_ptr)
+static int link_resetting(struct tipc_link *l)
{
- kref_get(&l_ptr->ref);
+ return l->state == TIPC_LINK_RESETTING;
}
-static void tipc_link_put(struct tipc_link *l_ptr)
+static int link_establishing(struct tipc_link *l)
{
- kref_put(&l_ptr->ref, tipc_link_release);
+ return l->state == TIPC_LINK_ESTABLISHING;
+}
+
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq);
+static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
+ u16 rcvgap, int tolerance, int priority,
+ struct sk_buff_head *xmitq);
+static void link_reset_statistics(struct tipc_link *l_ptr);
+static void link_print(struct tipc_link *l_ptr, const char *str);
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+ struct sk_buff_head *xmitq);
+static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
+static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
+static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
+static int tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
+
+/*
+ * Simple link routines
+ */
+static unsigned int align(unsigned int i)
+{
+ return (i + 3) & ~3u;
}
static struct tipc_link *tipc_parallel_link(struct tipc_link *l)
{
- if (l->owner->active_links[0] != l)
- return l->owner->active_links[0];
- return l->owner->active_links[1];
+ struct tipc_node *n = l->owner;
+
+ if (node_active_link(n, 0) != l)
+ return node_active_link(n, 0);
+ return node_active_link(n, 1);
}
/*
{
if (!l_ptr)
return 0;
- return link_working_working(l_ptr) || link_working_unknown(l_ptr);
+ return link_working(l_ptr) || link_probing(l_ptr);
}
-int tipc_link_is_active(struct tipc_link *l_ptr)
+int tipc_link_is_active(struct tipc_link *l)
{
- return (l_ptr->owner->active_links[0] == l_ptr) ||
- (l_ptr->owner->active_links[1] == l_ptr);
-}
-
-/**
- * link_timeout - handle expiration of link timer
- * @l_ptr: pointer to link
- */
-static void link_timeout(unsigned long data)
-{
- struct tipc_link *l_ptr = (struct tipc_link *)data;
- struct sk_buff *skb;
-
- tipc_node_lock(l_ptr->owner);
-
- /* update counters used in statistical profiling of send traffic */
- l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq);
- l_ptr->stats.queue_sz_counts++;
-
- skb = skb_peek(&l_ptr->transmq);
- if (skb) {
- struct tipc_msg *msg = buf_msg(skb);
- u32 length = msg_size(msg);
-
- if ((msg_user(msg) == MSG_FRAGMENTER) &&
- (msg_type(msg) == FIRST_FRAGMENT)) {
- length = msg_size(msg_get_wrapped(msg));
- }
- if (length) {
- l_ptr->stats.msg_lengths_total += length;
- l_ptr->stats.msg_length_counts++;
- if (length <= 64)
- l_ptr->stats.msg_length_profile[0]++;
- else if (length <= 256)
- l_ptr->stats.msg_length_profile[1]++;
- else if (length <= 1024)
- l_ptr->stats.msg_length_profile[2]++;
- else if (length <= 4096)
- l_ptr->stats.msg_length_profile[3]++;
- else if (length <= 16384)
- l_ptr->stats.msg_length_profile[4]++;
- else if (length <= 32768)
- l_ptr->stats.msg_length_profile[5]++;
- else
- l_ptr->stats.msg_length_profile[6]++;
- }
- }
+ struct tipc_node *n = l->owner;
- /* do all other link processing performed on a periodic basis */
- if (l_ptr->silent_intv_cnt || tipc_bclink_acks_missing(l_ptr->owner))
- link_state_event(l_ptr, SILENCE_EVT);
- l_ptr->silent_intv_cnt++;
- if (skb_queue_len(&l_ptr->backlogq))
- tipc_link_push_packets(l_ptr);
- link_set_timer(l_ptr, l_ptr->keepalive_intv);
- tipc_node_unlock(l_ptr->owner);
- tipc_link_put(l_ptr);
-}
-
-static void link_set_timer(struct tipc_link *link, unsigned long time)
-{
- if (!mod_timer(&link->timer, jiffies + time))
- tipc_link_get(link);
+ return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
}
/**
*/
struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
struct tipc_bearer *b_ptr,
- const struct tipc_media_addr *media_addr)
+ const struct tipc_media_addr *media_addr,
+ struct sk_buff_head *inputq,
+ struct sk_buff_head *namedq)
{
struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
struct tipc_link *l_ptr;
return NULL;
}
- if (n_ptr->links[b_ptr->identity]) {
+ if (n_ptr->links[b_ptr->identity].link) {
tipc_addr_string_fill(addr_string, n_ptr->addr);
pr_err("Attempt to establish second link on <%s> to %s\n",
b_ptr->name, addr_string);
pr_warn("Link creation failed, no memory\n");
return NULL;
}
- kref_init(&l_ptr->ref);
l_ptr->addr = peer;
if_name = strchr(b_ptr->name, ':') + 1;
sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
/* 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;
+ l_ptr->tolerance = b_ptr->tolerance;
+ l_ptr->snd_nxt = 1;
+ l_ptr->rcv_nxt = 1;
+ l_ptr->state = TIPC_LINK_RESETTING;
l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
msg = l_ptr->pmsg;
__skb_queue_head_init(&l_ptr->backlogq);
__skb_queue_head_init(&l_ptr->deferdq);
skb_queue_head_init(&l_ptr->wakeupq);
- skb_queue_head_init(&l_ptr->inputq);
- skb_queue_head_init(&l_ptr->namedq);
+ l_ptr->inputq = inputq;
+ l_ptr->namedq = namedq;
+ skb_queue_head_init(l_ptr->inputq);
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);
-
return l_ptr;
}
+/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
+ *
+ * Give a newly added peer node the sequence number where it should
+ * start receiving and acking broadcast packets.
+ */
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff *skb;
+ struct sk_buff_head list;
+ u16 last_sent;
+
+ skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
+ 0, l->addr, link_own_addr(l), 0, 0, 0);
+ if (!skb)
+ return;
+ last_sent = tipc_bclink_get_last_sent(l->owner->net);
+ msg_set_last_bcast(buf_msg(skb), last_sent);
+ __skb_queue_head_init(&list);
+ __skb_queue_tail(&list, skb);
+ tipc_link_xmit(l, &list, xmitq);
+}
+
/**
- * tipc_link_delete - Delete a link
- * @l: link to be deleted
+ * tipc_link_fsm_evt - link finite state machine
+ * @l: pointer to link
+ * @evt: state machine event to be processed
+ * @xmitq: queue to prepend created protocol message, if any
*/
-void tipc_link_delete(struct tipc_link *l)
+static int tipc_link_fsm_evt(struct tipc_link *l, int evt,
+ struct sk_buff_head *xmitq)
{
- 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);
- tipc_link_put(l);
+ int mtyp = 0, rc = 0;
+ struct tipc_link *pl;
+ enum {
+ LINK_RESET = 1,
+ LINK_ACTIVATE = (1 << 1),
+ SND_PROBE = (1 << 2),
+ SND_STATE = (1 << 3),
+ SND_RESET = (1 << 4),
+ SND_ACTIVATE = (1 << 5),
+ SND_BCAST_SYNC = (1 << 6)
+ } actions = 0;
+
+ if (l->exec_mode == TIPC_LINK_BLOCKED)
+ return rc;
+
+ switch (l->state) {
+ case TIPC_LINK_WORKING:
+ switch (evt) {
+ case TRAFFIC_EVT:
+ case ACTIVATE_EVT:
+ break;
+ case SILENCE_EVT:
+ l->state = TIPC_LINK_PROBING;
+ actions |= SND_PROBE;
+ break;
+ case PEER_RESET_EVT:
+ actions |= LINK_RESET | SND_ACTIVATE;
+ break;
+ default:
+ pr_debug("%s%u WORKING\n", link_unk_evt, evt);
+ }
+ break;
+ case TIPC_LINK_PROBING:
+ switch (evt) {
+ case TRAFFIC_EVT:
+ case ACTIVATE_EVT:
+ l->state = TIPC_LINK_WORKING;
+ break;
+ case PEER_RESET_EVT:
+ actions |= LINK_RESET | SND_ACTIVATE;
+ break;
+ case SILENCE_EVT:
+ if (l->silent_intv_cnt <= l->abort_limit) {
+ actions |= SND_PROBE;
+ break;
+ }
+ actions |= LINK_RESET | SND_RESET;
+ break;
+ default:
+ pr_err("%s%u PROBING\n", link_unk_evt, evt);
+ }
+ break;
+ case TIPC_LINK_RESETTING:
+ switch (evt) {
+ case TRAFFIC_EVT:
+ break;
+ case ACTIVATE_EVT:
+ pl = node_active_link(l->owner, 0);
+ if (pl && link_probing(pl))
+ break;
+ l->state = TIPC_LINK_WORKING;
+ actions |= LINK_ACTIVATE;
+ if (!l->owner->working_links)
+ actions |= SND_BCAST_SYNC;
+ break;
+ case PEER_RESET_EVT:
+ l->state = TIPC_LINK_ESTABLISHING;
+ actions |= SND_ACTIVATE;
+ break;
+ case SILENCE_EVT:
+ actions |= SND_RESET;
+ break;
+ default:
+ pr_err("%s%u in RESETTING\n", link_unk_evt, evt);
+ }
+ break;
+ case TIPC_LINK_ESTABLISHING:
+ switch (evt) {
+ case TRAFFIC_EVT:
+ case ACTIVATE_EVT:
+ pl = node_active_link(l->owner, 0);
+ if (pl && link_probing(pl))
+ break;
+ l->state = TIPC_LINK_WORKING;
+ actions |= LINK_ACTIVATE;
+ if (!l->owner->working_links)
+ actions |= SND_BCAST_SYNC;
+ break;
+ case PEER_RESET_EVT:
+ break;
+ case SILENCE_EVT:
+ actions |= SND_ACTIVATE;
+ break;
+ default:
+ pr_err("%s%u ESTABLISHING\n", link_unk_evt, evt);
+ }
+ break;
+ default:
+ pr_err("Unknown link state %u/%u\n", l->state, evt);
+ }
+
+ /* Perform actions as decided by FSM */
+ if (actions & LINK_RESET) {
+ l->exec_mode = TIPC_LINK_BLOCKED;
+ rc |= TIPC_LINK_DOWN_EVT;
+ }
+ if (actions & LINK_ACTIVATE) {
+ l->exec_mode = TIPC_LINK_OPEN;
+ rc |= TIPC_LINK_UP_EVT;
+ }
+ if (actions & (SND_STATE | SND_PROBE))
+ mtyp = STATE_MSG;
+ if (actions & SND_RESET)
+ mtyp = RESET_MSG;
+ if (actions & SND_ACTIVATE)
+ mtyp = ACTIVATE_MSG;
+ if (actions & (SND_PROBE | SND_STATE | SND_RESET | SND_ACTIVATE))
+ tipc_link_build_proto_msg(l, mtyp, actions & SND_PROBE,
+ 0, 0, 0, xmitq);
+ if (actions & SND_BCAST_SYNC)
+ tipc_link_build_bcast_sync_msg(l, xmitq);
+ return rc;
}
-void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
+/* link_profile_stats - update statistical profiling of traffic
+ */
+static void link_profile_stats(struct tipc_link *l)
{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct tipc_link *link;
- struct tipc_node *node;
+ struct sk_buff *skb;
+ struct tipc_msg *msg;
+ int length;
- rcu_read_lock();
- list_for_each_entry_rcu(node, &tn->node_list, list) {
- tipc_node_lock(node);
- link = node->links[bearer_id];
- if (link)
- tipc_link_delete(link);
- tipc_node_unlock(node);
+ /* Update counters used in statistical profiling of send traffic */
+ l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
+ l->stats.queue_sz_counts++;
+
+ skb = skb_peek(&l->transmq);
+ if (!skb)
+ return;
+ msg = buf_msg(skb);
+ length = msg_size(msg);
+
+ if (msg_user(msg) == MSG_FRAGMENTER) {
+ if (msg_type(msg) != FIRST_FRAGMENT)
+ return;
+ length = msg_size(msg_get_wrapped(msg));
}
- rcu_read_unlock();
+ l->stats.msg_lengths_total += length;
+ l->stats.msg_length_counts++;
+ if (length <= 64)
+ l->stats.msg_length_profile[0]++;
+ else if (length <= 256)
+ l->stats.msg_length_profile[1]++;
+ else if (length <= 1024)
+ l->stats.msg_length_profile[2]++;
+ else if (length <= 4096)
+ l->stats.msg_length_profile[3]++;
+ else if (length <= 16384)
+ l->stats.msg_length_profile[4]++;
+ else if (length <= 32768)
+ l->stats.msg_length_profile[5]++;
+ else
+ l->stats.msg_length_profile[6]++;
+}
+
+/* tipc_link_timeout - perform periodic task as instructed from node timeout
+ */
+int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
+{
+ int rc = 0;
+
+ link_profile_stats(l);
+ if (l->silent_intv_cnt)
+ rc = tipc_link_fsm_evt(l, SILENCE_EVT, xmitq);
+ else if (link_working(l) && tipc_bclink_acks_missing(l->owner))
+ tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
+ l->silent_intv_cnt++;
+ return rc;
}
/**
* @link: congested link
* @list: message that was attempted sent
* Create pseudo msg to send back to user when congestion abates
- * Only consumes message if there is an error
+ * Does not consume buffer list
*/
static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
{
/* This really cannot happen... */
if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
- tipc_link_reset(link);
- goto err;
+ return -ENOBUFS;
}
/* Non-blocking sender: */
if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
addr, addr, oport, 0, 0);
if (!skb)
- goto err;
+ return -ENOBUFS;
TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
TIPC_SKB_CB(skb)->chain_imp = imp;
skb_queue_tail(&link->wakeupq, skb);
link->stats.link_congs++;
return -ELINKCONG;
-err:
- __skb_queue_purge(list);
- return -ENOBUFS;
}
/**
if ((pnd[imp] + l->backlog[imp].len) >= lim)
break;
skb_unlink(skb, &l->wakeupq);
- skb_queue_tail(&l->inputq, skb);
- l->owner->inputq = &l->inputq;
+ skb_queue_tail(l->inputq, skb);
+ l->owner->inputq = l->inputq;
l->owner->action_flags |= TIPC_MSG_EVT;
}
}
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);
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;
- l_ptr->state = RESET_UNKNOWN;
+ l_ptr->state = TIPC_LINK_RESETTING;
- if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
+ if ((prev_state == TIPC_LINK_RESETTING) ||
+ (prev_state == TIPC_LINK_ESTABLISHING))
return;
- tipc_node_link_down(l_ptr->owner, 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;
+ 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;
pl->failover_checkpt = l_ptr->rcv_nxt;
__skb_queue_purge(&l_ptr->transmq);
__skb_queue_purge(&l_ptr->deferdq);
if (!owner->inputq)
- owner->inputq = &l_ptr->inputq;
+ owner->inputq = l_ptr->inputq;
skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq);
if (!skb_queue_empty(owner->inputq))
owner->action_flags |= TIPC_MSG_EVT;
l_ptr->reasm_buf = NULL;
l_ptr->rcv_unacked = 0;
l_ptr->snd_nxt = 1;
+ l_ptr->rcv_nxt = 1;
l_ptr->silent_intv_cnt = 0;
+ l_ptr->stats.recv_info = 0;
l_ptr->stale_count = 0;
link_reset_statistics(l_ptr);
}
-static void link_activate(struct tipc_link *link)
-{
- struct tipc_node *node = link->owner;
-
- link->rcv_nxt = 1;
- link->stats.recv_info = 1;
- link->silent_intv_cnt = 0;
- tipc_node_link_up(node, link);
- tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
-}
-
-/**
- * link_state_event - link finite state machine
- * @l_ptr: pointer to link
- * @event: state machine event to process
- */
-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)
- return;
-
- switch (l_ptr->state) {
- case WORKING_WORKING:
- switch (event) {
- case TRAFFIC_MSG_EVT:
- case ACTIVATE_MSG:
- l_ptr->silent_intv_cnt = 0;
- break;
- case SILENCE_EVT:
- if (!l_ptr->silent_intv_cnt) {
- if (tipc_bclink_acks_missing(l_ptr->owner))
- tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 0, 0, 0, 0);
- break;
- }
- l_ptr->state = WORKING_UNKNOWN;
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
- break;
- case RESET_MSG:
- pr_debug("%s<%s>, requested by peer\n",
- link_rst_msg, l_ptr->name);
- tipc_link_reset(l_ptr);
- l_ptr->state = RESET_RESET;
- tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0);
- break;
- default:
- pr_debug("%s%u in WW state\n", link_unk_evt, event);
- }
- break;
- case WORKING_UNKNOWN:
- switch (event) {
- case TRAFFIC_MSG_EVT:
- case ACTIVATE_MSG:
- l_ptr->state = WORKING_WORKING;
- l_ptr->silent_intv_cnt = 0;
- break;
- case RESET_MSG:
- pr_debug("%s<%s>, requested by peer while probing\n",
- link_rst_msg, l_ptr->name);
- tipc_link_reset(l_ptr);
- l_ptr->state = RESET_RESET;
- tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0);
- break;
- case SILENCE_EVT:
- if (!l_ptr->silent_intv_cnt) {
- l_ptr->state = WORKING_WORKING;
- if (tipc_bclink_acks_missing(l_ptr->owner))
- tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 0, 0, 0, 0);
- } else if (l_ptr->silent_intv_cnt <
- l_ptr->abort_limit) {
- tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 1, 0, 0, 0);
- } else { /* Link has failed */
- pr_debug("%s<%s>, peer not responding\n",
- link_rst_msg, l_ptr->name);
- tipc_link_reset(l_ptr);
- l_ptr->state = RESET_UNKNOWN;
- tipc_link_proto_xmit(l_ptr, RESET_MSG,
- 0, 0, 0, 0);
- }
- break;
- default:
- pr_err("%s%u in WU state\n", link_unk_evt, event);
- }
- break;
- case RESET_UNKNOWN:
- switch (event) {
- case TRAFFIC_MSG_EVT:
- break;
- case ACTIVATE_MSG:
- other = l_ptr->owner->active_links[0];
- if (other && link_working_unknown(other))
- break;
- l_ptr->state = WORKING_WORKING;
- link_activate(l_ptr);
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
- if (l_ptr->owner->working_links == 1)
- tipc_link_sync_xmit(l_ptr);
- break;
- case RESET_MSG:
- l_ptr->state = RESET_RESET;
- 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;
- default:
- pr_err("%s%u in RU state\n", link_unk_evt, event);
- }
- break;
- case RESET_RESET:
- switch (event) {
- case TRAFFIC_MSG_EVT:
- case ACTIVATE_MSG:
- other = l_ptr->owner->active_links[0];
- if (other && link_working_unknown(other))
- break;
- l_ptr->state = WORKING_WORKING;
- link_activate(l_ptr);
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
- if (l_ptr->owner->working_links == 1)
- tipc_link_sync_xmit(l_ptr);
- break;
- case RESET_MSG:
- break;
- case SILENCE_EVT:
- tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0);
- break;
- default:
- pr_err("%s%u in RR state\n", link_unk_evt, event);
- }
- break;
- default:
- pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
- }
-}
-
/**
* __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
* @link: link to use
* @list: chain of buffers containing message
*
- * Consumes the buffer chain, except when returning -ELINKCONG,
- * since the caller then may want to make more send attempts.
+ * Consumes the buffer chain, except when returning an error code,
* Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
* Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
*/
if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
return link_schedule_user(link, list);
}
- if (unlikely(msg_size(msg) > mtu)) {
- __skb_queue_purge(list);
+ if (unlikely(msg_size(msg) > mtu))
return -EMSGSIZE;
- }
+
/* Prepare each packet for sending, and add to relevant queue: */
while (skb_queue_len(list)) {
skb = skb_peek(list);
return 0;
}
-static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
-{
- skb_queue_head_init(list);
- __skb_queue_tail(list, skb);
-}
-
-static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
-{
- struct sk_buff_head head;
-
- skb2list(skb, &head);
- return __tipc_link_xmit(link->owner->net, link, &head);
-}
-
-/* tipc_link_xmit_skb(): send single buffer to destination
- * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
- * messages, which will not be rejected
- * The only exception is datagram messages rerouted after secondary
- * lookup, which are rare and safe to dispose of anyway.
- * TODO: Return real return value, and let callers use
- * tipc_wait_for_sendpkt() where applicable
- */
-int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
- u32 selector)
-{
- struct sk_buff_head head;
- int rc;
-
- skb2list(skb, &head);
- rc = tipc_link_xmit(net, &head, dnode, selector);
- if (rc == -ELINKCONG)
- kfree_skb(skb);
- return 0;
-}
-
/**
- * tipc_link_xmit() is the general link level function for message sending
- * @net: the applicable net namespace
+ * tipc_link_xmit(): enqueue buffer list according to queue situation
+ * @link: link to use
* @list: chain of buffers containing message
- * @dsz: amount of user data to be sent
- * @dnode: address of destination node
- * @selector: a number used for deterministic link selection
- * Consumes the buffer chain, except when returning -ELINKCONG
- * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
+ * @xmitq: returned list of packets to be sent by caller
+ *
+ * Consumes the buffer chain, except when returning -ELINKCONG,
+ * since the caller then may want to make more send attempts.
+ * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
+ * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
*/
-int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
- u32 selector)
+int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
+ struct sk_buff_head *xmitq)
{
- struct tipc_link *link = NULL;
- struct tipc_node *node;
- int rc = -EHOSTUNREACH;
+ struct tipc_msg *hdr = buf_msg(skb_peek(list));
+ unsigned int maxwin = l->window;
+ unsigned int i, imp = msg_importance(hdr);
+ unsigned int mtu = l->mtu;
+ u16 ack = l->rcv_nxt - 1;
+ u16 seqno = l->snd_nxt;
+ u16 bc_last_in = l->owner->bclink.last_in;
+ struct sk_buff_head *transmq = &l->transmq;
+ struct sk_buff_head *backlogq = &l->backlogq;
+ struct sk_buff *skb, *_skb, *bskb;
- node = tipc_node_find(net, dnode);
- if (node) {
- tipc_node_lock(node);
- link = node->active_links[selector & 1];
- if (link)
- rc = __tipc_link_xmit(net, link, list);
- tipc_node_unlock(node);
- tipc_node_put(node);
+ /* Match msg importance against this and all higher backlog limits: */
+ for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
+ if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
+ return link_schedule_user(l, list);
}
- if (link)
- return rc;
+ if (unlikely(msg_size(hdr) > mtu))
+ return -EMSGSIZE;
- if (likely(in_own_node(net, dnode))) {
- tipc_sk_rcv(net, list);
- return 0;
- }
+ /* Prepare each packet for sending, and add to relevant queue: */
+ while (skb_queue_len(list)) {
+ skb = skb_peek(list);
+ hdr = buf_msg(skb);
+ msg_set_seqno(hdr, seqno);
+ msg_set_ack(hdr, ack);
+ msg_set_bcast_ack(hdr, bc_last_in);
- __skb_queue_purge(list);
- return rc;
+ if (likely(skb_queue_len(transmq) < maxwin)) {
+ _skb = skb_clone(skb, GFP_ATOMIC);
+ if (!_skb)
+ return -ENOBUFS;
+ __skb_dequeue(list);
+ __skb_queue_tail(transmq, skb);
+ __skb_queue_tail(xmitq, _skb);
+ l->rcv_unacked = 0;
+ seqno++;
+ continue;
+ }
+ if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
+ kfree_skb(__skb_dequeue(list));
+ l->stats.sent_bundled++;
+ continue;
+ }
+ if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
+ kfree_skb(__skb_dequeue(list));
+ __skb_queue_tail(backlogq, bskb);
+ l->backlog[msg_importance(buf_msg(bskb))].len++;
+ l->stats.sent_bundled++;
+ l->stats.sent_bundles++;
+ continue;
+ }
+ l->backlog[imp].len += skb_queue_len(list);
+ skb_queue_splice_tail_init(list, backlogq);
+ }
+ l->snd_nxt = seqno;
+ return 0;
}
-/*
- * tipc_link_sync_xmit - synchronize broadcast link endpoints.
- *
- * Give a newly added peer node the sequence number where it should
- * start receiving and acking broadcast packets.
- *
- * Called with node locked
- */
-static void tipc_link_sync_xmit(struct tipc_link *link)
+static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
{
- struct sk_buff *skb;
- struct tipc_msg *msg;
+ skb_queue_head_init(list);
+ __skb_queue_tail(list, skb);
+}
- skb = tipc_buf_acquire(INT_H_SIZE);
- if (!skb)
- return;
+static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
+{
+ struct sk_buff_head head;
- msg = buf_msg(skb);
- tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,
- INT_H_SIZE, link->addr);
- msg_set_last_bcast(msg, link->owner->bclink.acked);
- __tipc_link_xmit_skb(link, skb);
+ skb2list(skb, &head);
+ return __tipc_link_xmit(link->owner->net, link, &head);
}
/*
link->snd_nxt = seqno;
}
-void tipc_link_reset_all(struct tipc_node *node)
+void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
{
- char addr_string[16];
- u32 i;
-
- tipc_node_lock(node);
-
- pr_warn("Resetting all links to %s\n",
- tipc_addr_string_fill(addr_string, node->addr));
+ struct sk_buff *skb, *_skb;
+ struct tipc_msg *hdr;
+ u16 seqno = l->snd_nxt;
+ u16 ack = l->rcv_nxt - 1;
- for (i = 0; i < MAX_BEARERS; i++) {
- if (node->links[i]) {
- link_print(node->links[i], "Resetting link\n");
- tipc_link_reset(node->links[i]);
- }
+ while (skb_queue_len(&l->transmq) < l->window) {
+ skb = skb_peek(&l->backlogq);
+ if (!skb)
+ break;
+ _skb = skb_clone(skb, GFP_ATOMIC);
+ if (!_skb)
+ break;
+ __skb_dequeue(&l->backlogq);
+ hdr = buf_msg(skb);
+ l->backlog[msg_importance(hdr)].len--;
+ __skb_queue_tail(&l->transmq, skb);
+ __skb_queue_tail(xmitq, _skb);
+ msg_set_ack(hdr, ack);
+ msg_set_seqno(hdr, seqno);
+ msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+ l->rcv_unacked = 0;
+ seqno++;
}
-
- tipc_node_unlock(node);
+ l->snd_nxt = seqno;
}
static void link_retransmit_failure(struct tipc_link *l_ptr,
if (l_ptr->addr) {
/* Handle failure on standard link */
- link_print(l_ptr, "Resetting link\n");
- tipc_link_reset(l_ptr);
-
+ link_print(l_ptr, "Resetting link ");
+ pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
+ msg_user(msg), msg_type(msg), msg_size(msg),
+ msg_errcode(msg));
+ pr_info("sqno %u, prev: %x, src: %x\n",
+ msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg));
} else {
/* Handle failure on broadcast link */
struct tipc_node *n_ptr;
}
}
+static int tipc_link_retransm(struct tipc_link *l, int retransm,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
+ struct tipc_msg *hdr;
+
+ if (!skb)
+ return 0;
+
+ /* Detect repeated retransmit failures on same packet */
+ if (likely(l->last_retransm != buf_seqno(skb))) {
+ l->last_retransm = buf_seqno(skb);
+ l->stale_count = 1;
+ } else if (++l->stale_count > 100) {
+ link_retransmit_failure(l, skb);
+ l->exec_mode = TIPC_LINK_BLOCKED;
+ return TIPC_LINK_DOWN_EVT;
+ }
+ skb_queue_walk(&l->transmq, skb) {
+ if (!retransm)
+ return 0;
+ hdr = buf_msg(skb);
+ _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
+ if (!_skb)
+ return 0;
+ hdr = buf_msg(_skb);
+ msg_set_ack(hdr, l->rcv_nxt - 1);
+ msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+ _skb->priority = TC_PRIO_CONTROL;
+ __skb_queue_tail(xmitq, _skb);
+ retransm--;
+ l->stats.retransmitted++;
+ }
+ return 0;
+}
+
/* link_synch(): check if all packets arrived before the synch
* point have been consumed
* Returns true if the parallel links are synched, otherwise false
/* Is it still in the input queue ? */
post_synch = mod(pl->rcv_nxt - l->synch_point) - 1;
- if (skb_queue_len(&pl->inputq) > post_synch)
+ if (skb_queue_len(pl->inputq) > post_synch)
return false;
synched:
- l->flags &= ~LINK_SYNCHING;
+ l->exec_mode = TIPC_LINK_OPEN;
return true;
}
-static void link_retrieve_defq(struct tipc_link *link,
- struct sk_buff_head *list)
-{
- u16 seq_no;
-
- if (skb_queue_empty(&link->deferdq))
- return;
-
- seq_no = buf_seqno(skb_peek(&link->deferdq));
- if (seq_no == link->rcv_nxt)
- skb_queue_splice_tail_init(&link->deferdq, list);
-}
-
-/**
- * tipc_rcv - process TIPC packets/messages arriving from off-node
- * @net: the applicable net namespace
- * @skb: TIPC packet
- * @b_ptr: pointer to bearer message arrived on
- *
- * Invoked with no locks held. Bearer pointer must point to a valid bearer
- * structure (i.e. cannot be NULL), but bearer can be inactive.
- */
-void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
-{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct sk_buff_head head;
- struct tipc_node *n_ptr;
- struct tipc_link *l_ptr;
- struct sk_buff *skb1, *tmp;
- struct tipc_msg *msg;
- u16 seq_no;
- u16 ackd;
- u32 released;
-
- skb2list(skb, &head);
-
- while ((skb = __skb_dequeue(&head))) {
- /* Ensure message is well-formed */
- if (unlikely(!tipc_msg_validate(skb)))
- goto discard;
-
- /* Handle arrival of a non-unicast link message */
- msg = buf_msg(skb);
- if (unlikely(msg_non_seq(msg))) {
- if (msg_user(msg) == LINK_CONFIG)
- tipc_disc_rcv(net, skb, b_ptr);
- else
- tipc_bclink_rcv(net, skb);
- continue;
- }
-
- /* Discard unicast link messages destined for another node */
- if (unlikely(!msg_short(msg) &&
- (msg_destnode(msg) != tn->own_addr)))
- goto discard;
-
- /* Locate neighboring node that sent message */
- n_ptr = tipc_node_find(net, msg_prevnode(msg));
- if (unlikely(!n_ptr))
- goto discard;
-
- tipc_node_lock(n_ptr);
- /* Locate unicast link endpoint that should handle message */
- l_ptr = n_ptr->links[b_ptr->identity];
- if (unlikely(!l_ptr))
- goto unlock;
-
- /* Verify that communication with node is currently allowed */
- if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
- msg_user(msg) == LINK_PROTOCOL &&
- (msg_type(msg) == RESET_MSG ||
- msg_type(msg) == ACTIVATE_MSG) &&
- !msg_redundant_link(msg))
- n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
-
- if (tipc_node_blocked(n_ptr))
- goto unlock;
-
- /* Validate message sequence number info */
- seq_no = msg_seqno(msg);
- ackd = msg_ack(msg);
-
- /* Release acked messages */
- if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg)))
- tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
-
- released = 0;
- skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) {
- if (more(buf_seqno(skb1), ackd))
- break;
- __skb_unlink(skb1, &l_ptr->transmq);
- kfree_skb(skb1);
- released = 1;
- }
-
- /* Try sending any messages link endpoint has pending */
- if (unlikely(skb_queue_len(&l_ptr->backlogq)))
- tipc_link_push_packets(l_ptr);
-
- if (released && !skb_queue_empty(&l_ptr->wakeupq))
- link_prepare_wakeup(l_ptr);
-
- /* Process the incoming packet */
- if (unlikely(!link_working_working(l_ptr))) {
- if (msg_user(msg) == LINK_PROTOCOL) {
- tipc_link_proto_rcv(l_ptr, skb);
- link_retrieve_defq(l_ptr, &head);
- skb = NULL;
- goto unlock;
- }
-
- /* Traffic message. Conditionally activate link */
- link_state_event(l_ptr, TRAFFIC_MSG_EVT);
-
- if (link_working_working(l_ptr)) {
- /* Re-insert buffer in front of queue */
- __skb_queue_head(&head, skb);
- skb = NULL;
- goto unlock;
- }
- goto unlock;
- }
-
- /* Link is now in state WORKING_WORKING */
- if (unlikely(seq_no != l_ptr->rcv_nxt)) {
- link_handle_out_of_seq_msg(l_ptr, skb);
- link_retrieve_defq(l_ptr, &head);
- skb = NULL;
- goto unlock;
- }
- l_ptr->silent_intv_cnt = 0;
-
- /* Synchronize with parallel link if applicable */
- if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) {
- if (!link_synch(l_ptr))
- goto unlock;
- }
- l_ptr->rcv_nxt++;
- if (unlikely(!skb_queue_empty(&l_ptr->deferdq)))
- link_retrieve_defq(l_ptr, &head);
- if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
- l_ptr->stats.sent_acks++;
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
- }
- tipc_link_input(l_ptr, skb);
- skb = NULL;
-unlock:
- tipc_node_unlock(n_ptr);
- tipc_node_put(n_ptr);
-discard:
- if (unlikely(skb))
- kfree_skb(skb);
- }
-}
-
/* tipc_data_input - deliver data and name distr msgs to upper layer
*
* Consumes buffer if message is of right type
case TIPC_HIGH_IMPORTANCE:
case TIPC_CRITICAL_IMPORTANCE:
case CONN_MANAGER:
- if (tipc_skb_queue_tail(&link->inputq, skb, dport)) {
- node->inputq = &link->inputq;
+ if (tipc_skb_queue_tail(link->inputq, skb, dport)) {
+ node->inputq = link->inputq;
node->action_flags |= TIPC_MSG_EVT;
}
return true;
case NAME_DISTRIBUTOR:
node->bclink.recv_permitted = true;
- node->namedq = &link->namedq;
- skb_queue_tail(&link->namedq, skb);
- if (skb_queue_len(&link->namedq) == 1)
+ node->namedq = link->namedq;
+ skb_queue_tail(link->namedq, skb);
+ if (skb_queue_len(link->namedq) == 1)
node->action_flags |= TIPC_NAMED_MSG_EVT;
return true;
case MSG_BUNDLER:
* Consumes buffer
* Node lock must be held
*/
-static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
+static int tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
{
struct tipc_node *node = link->owner;
struct tipc_msg *msg = buf_msg(skb);
struct sk_buff *iskb;
int pos = 0;
-
- if (likely(tipc_data_input(link, skb)))
- return;
+ int rc = 0;
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;
}
- if (!tipc_link_failover_rcv(link, &skb))
+ rc |= tipc_link_failover_rcv(link, &skb);
+ if (!skb)
break;
if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {
tipc_data_input(link, skb);
link->stats.recv_fragmented++;
tipc_data_input(link, skb);
} else if (!link->reasm_buf) {
- tipc_link_reset(link);
+ link->exec_mode = TIPC_LINK_BLOCKED;
+ rc |= TIPC_LINK_DOWN_EVT;
}
break;
case BCAST_PROTOCOL:
default:
break;
};
+ return rc;
+}
+
+static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
+{
+ bool released = false;
+ struct sk_buff *skb, *tmp;
+
+ skb_queue_walk_safe(&l->transmq, skb, tmp) {
+ if (more(buf_seqno(skb), acked))
+ break;
+ __skb_unlink(skb, &l->transmq);
+ kfree_skb(skb);
+ released = true;
+ }
+ return released;
+}
+
+/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
+ * @link: the link that should handle the message
+ * @skb: TIPC packet
+ * @xmitq: queue to place packets to be sent after this call
+ */
+int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq)
+{
+ struct sk_buff_head *arrvq = &l->deferdq;
+ struct sk_buff *tmp;
+ struct tipc_msg *hdr;
+ u16 seqno, rcv_nxt;
+ int rc = 0;
+
+ if (unlikely(!__tipc_skb_queue_sorted(arrvq, skb))) {
+ if (!(skb_queue_len(arrvq) % TIPC_NACK_INTV))
+ tipc_link_build_proto_msg(l, STATE_MSG, 0,
+ 0, 0, 0, xmitq);
+ return rc;
+ }
+
+ skb_queue_walk_safe(arrvq, skb, tmp) {
+ hdr = buf_msg(skb);
+
+ /* Verify and update link state */
+ if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) {
+ __skb_dequeue(arrvq);
+ rc |= tipc_link_proto_rcv(l, skb, xmitq);
+ continue;
+ }
+
+ if (unlikely(!link_working(l))) {
+ rc |= tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
+ if (!link_working(l)) {
+ kfree_skb(__skb_dequeue(arrvq));
+ return rc;
+ }
+ }
+
+ l->silent_intv_cnt = 0;
+
+ /* Forward queues and wake up waiting users */
+ if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
+ tipc_link_advance_backlog(l, xmitq);
+ if (unlikely(!skb_queue_empty(&l->wakeupq)))
+ link_prepare_wakeup(l);
+ }
+
+ /* Defer reception if there is a gap in the sequence */
+ seqno = msg_seqno(hdr);
+ rcv_nxt = l->rcv_nxt;
+ if (unlikely(less(rcv_nxt, seqno))) {
+ l->stats.deferred_recv++;
+ return rc;
+ }
+
+ __skb_dequeue(arrvq);
+
+ /* Drop if packet already received */
+ if (unlikely(more(rcv_nxt, seqno))) {
+ l->stats.duplicates++;
+ kfree_skb(skb);
+ return rc;
+ }
+
+ /* Synchronize with parallel link if applicable */
+ if (unlikely(l->exec_mode == TIPC_LINK_TUNNEL))
+ if (!msg_dup(hdr) && !link_synch(l)) {
+ kfree_skb(skb);
+ return rc;
+ }
+
+ /* Packet can be delivered */
+ l->rcv_nxt++;
+ l->stats.recv_info++;
+ if (unlikely(!tipc_data_input(l, skb)))
+ rc |= tipc_link_input(l, skb);
+
+ /* Ack at regular intervals */
+ if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
+ l->rcv_unacked = 0;
+ l->stats.sent_acks++;
+ tipc_link_build_proto_msg(l, STATE_MSG,
+ 0, 0, 0, 0, xmitq);
+ }
+ }
+ return rc;
}
/**
}
/*
- * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
+ * Send protocol message to the other endpoint.
*/
-static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
- struct sk_buff *buf)
+void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
+ u32 gap, u32 tolerance, u32 priority)
{
- u32 seq_no = buf_seqno(buf);
-
- if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
- tipc_link_proto_rcv(l_ptr, buf);
- return;
- }
-
- /* Record OOS packet arrival */
- l_ptr->silent_intv_cnt = 0;
+ struct sk_buff *skb = NULL;
+ struct sk_buff_head xmitq;
- /*
- * Discard packet if a duplicate; otherwise add it to deferred queue
- * and notify peer of gap as per protocol specification
- */
- if (less(seq_no, l_ptr->rcv_nxt)) {
- l_ptr->stats.duplicates++;
- kfree_skb(buf);
+ __skb_queue_head_init(&xmitq);
+ tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
+ tolerance, priority, &xmitq);
+ skb = __skb_dequeue(&xmitq);
+ if (!skb)
return;
- }
-
- if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) {
- l_ptr->stats.deferred_recv++;
- if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1)
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
- } else {
- l_ptr->stats.duplicates++;
- }
+ tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr);
+ l->rcv_unacked = 0;
+ kfree_skb(skb);
}
-/*
- * Send protocol message to the other endpoint.
+/* tipc_link_build_proto_msg: prepare link protocol message for transmission
*/
-void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
- u32 gap, u32 tolerance, u32 priority)
+static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
+ u16 rcvgap, int tolerance, int priority,
+ struct sk_buff_head *xmitq)
{
- struct sk_buff *buf = NULL;
- struct tipc_msg *msg = l_ptr->pmsg;
- u32 msg_size = sizeof(l_ptr->proto_msg);
- int r_flag;
- u16 last_rcv;
-
- /* Don't send protocol message during link failover */
- if (l_ptr->flags & LINK_FAILINGOVER)
+ struct sk_buff *skb = NULL;
+ struct tipc_msg *hdr = l->pmsg;
+ u16 snd_nxt = l->snd_nxt;
+ u16 rcv_nxt = l->rcv_nxt;
+ u16 rcv_last = rcv_nxt - 1;
+ 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)
return;
- /* Abort non-RESET send if communication with node is prohibited */
- if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
- return;
-
- /* Create protocol message with "out-of-sequence" sequence number */
- msg_set_type(msg, msg_typ);
- msg_set_net_plane(msg, l_ptr->net_plane);
- msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
- msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net));
+ msg_set_type(hdr, mtyp);
+ msg_set_net_plane(hdr, l->net_plane);
+ msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+ msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net));
+ msg_set_link_tolerance(hdr, tolerance);
+ msg_set_linkprio(hdr, priority);
+ msg_set_redundant_link(hdr, node_up);
+ msg_set_seq_gap(hdr, 0);
- if (msg_typ == STATE_MSG) {
- u16 next_sent = l_ptr->snd_nxt;
+ /* Compatibility: created msg must not be in sequence with pkt flow */
+ msg_set_seqno(hdr, snd_nxt + U16_MAX / 2);
- if (!tipc_link_is_up(l_ptr))
+ if (mtyp == STATE_MSG) {
+ if (!tipc_link_is_up(l))
return;
- msg_set_next_sent(msg, next_sent);
- if (!skb_queue_empty(&l_ptr->deferdq)) {
- last_rcv = buf_seqno(skb_peek(&l_ptr->deferdq));
- gap = mod(last_rcv - l_ptr->rcv_nxt);
+ msg_set_next_sent(hdr, snd_nxt);
+
+ /* Override rcvgap if there are packets in deferred queue */
+ if (!skb_queue_empty(&l->deferdq))
+ rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt;
+ if (rcvgap) {
+ msg_set_seq_gap(hdr, rcvgap);
+ l->stats.sent_nacks++;
}
- msg_set_seq_gap(msg, gap);
- if (gap)
- l_ptr->stats.sent_nacks++;
- msg_set_link_tolerance(msg, tolerance);
- msg_set_linkprio(msg, priority);
- msg_set_max_pkt(msg, l_ptr->mtu);
- msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
- msg_set_probe(msg, probe_msg != 0);
- if (probe_msg)
- l_ptr->stats.sent_probes++;
- l_ptr->stats.sent_states++;
- } else { /* RESET_MSG or ACTIVATE_MSG */
- msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1));
- msg_set_seq_gap(msg, 0);
- msg_set_next_sent(msg, 1);
- msg_set_probe(msg, 0);
- msg_set_link_tolerance(msg, l_ptr->tolerance);
- msg_set_linkprio(msg, l_ptr->priority);
- msg_set_max_pkt(msg, l_ptr->advertised_mtu);
+ msg_set_ack(hdr, rcv_last);
+ msg_set_probe(hdr, probe);
+ if (probe)
+ l->stats.sent_probes++;
+ l->stats.sent_states++;
+ } else {
+ /* RESET_MSG or ACTIVATE_MSG */
+ msg_set_max_pkt(hdr, l->advertised_mtu);
+ msg_set_ack(hdr, l->failover_checkpt - 1);
+ msg_set_next_sent(hdr, 1);
}
-
- r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
- msg_set_redundant_link(msg, r_flag);
- msg_set_linkprio(msg, l_ptr->priority);
- msg_set_size(msg, msg_size);
-
- msg_set_seqno(msg, mod(l_ptr->snd_nxt + (0xffff / 2)));
-
- buf = tipc_buf_acquire(msg_size);
- if (!buf)
+ skb = tipc_buf_acquire(msg_size(hdr));
+ if (!skb)
return;
-
- skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
- buf->priority = TC_PRIO_CONTROL;
- tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf,
- &l_ptr->media_addr);
- l_ptr->rcv_unacked = 0;
- kfree_skb(buf);
+ skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
+ skb->priority = TC_PRIO_CONTROL;
+ __skb_queue_head(xmitq, skb);
}
-/*
- * Receive protocol message :
- * Note that network plane id propagates through the network, and may
- * change at any time. The node with lowest address rules
- */
-static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
- struct sk_buff *buf)
-{
- u32 rec_gap = 0;
- u32 msg_tol;
- struct tipc_msg *msg = buf_msg(buf);
-
- if (l_ptr->flags & LINK_FAILINGOVER)
- goto exit;
-
- if (l_ptr->net_plane != msg_net_plane(msg))
- if (link_own_addr(l_ptr) > msg_prevnode(msg))
- l_ptr->net_plane = msg_net_plane(msg);
-
- switch (msg_type(msg)) {
-
- case RESET_MSG:
- if (!link_working_unknown(l_ptr) &&
- (l_ptr->peer_session != INVALID_SESSION)) {
- if (less_eq(msg_session(msg), l_ptr->peer_session))
- break; /* duplicate or old reset: ignore */
- }
-
- if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
- link_working_unknown(l_ptr))) {
- /*
- * peer has lost contact -- don't allow peer's links
- * to reactivate before we recognize loss & clean up
- */
- l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
- }
-
- link_state_event(l_ptr, RESET_MSG);
-
- /* fall thru' */
- case ACTIVATE_MSG:
- /* Update link settings according other endpoint's values */
- strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
-
- msg_tol = msg_link_tolerance(msg);
- if (msg_tol > l_ptr->tolerance)
- link_set_supervision_props(l_ptr, msg_tol);
-
- if (msg_linkprio(msg) > l_ptr->priority)
- l_ptr->priority = msg_linkprio(msg);
-
- if (l_ptr->mtu > msg_max_pkt(msg))
- l_ptr->mtu = msg_max_pkt(msg);
-
- /* Synchronize broadcast link info, if not done previously */
- if (!tipc_node_is_up(l_ptr->owner)) {
- l_ptr->owner->bclink.last_sent =
- l_ptr->owner->bclink.last_in =
- msg_last_bcast(msg);
- l_ptr->owner->bclink.oos_state = 0;
- }
-
- l_ptr->peer_session = msg_session(msg);
- l_ptr->peer_bearer_id = msg_bearer_id(msg);
-
- if (msg_type(msg) == ACTIVATE_MSG)
- link_state_event(l_ptr, ACTIVATE_MSG);
- break;
- case STATE_MSG:
-
- msg_tol = msg_link_tolerance(msg);
- if (msg_tol)
- link_set_supervision_props(l_ptr, msg_tol);
-
- if (msg_linkprio(msg) &&
- (msg_linkprio(msg) != l_ptr->priority)) {
- pr_debug("%s<%s>, priority change %u->%u\n",
- link_rst_msg, l_ptr->name,
- l_ptr->priority, msg_linkprio(msg));
- l_ptr->priority = msg_linkprio(msg);
- tipc_link_reset(l_ptr); /* Enforce change to take effect */
- break;
- }
-
- /* Record reception; force mismatch at next timeout: */
- l_ptr->silent_intv_cnt = 0;
-
- link_state_event(l_ptr, TRAFFIC_MSG_EVT);
- l_ptr->stats.recv_states++;
- if (link_reset_unknown(l_ptr))
- break;
-
- if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg)))
- rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt);
-
- if (msg_probe(msg))
- l_ptr->stats.recv_probes++;
-
- /* Protocol message before retransmits, reduce loss risk */
- if (l_ptr->owner->bclink.recv_permitted)
- tipc_bclink_update_link_state(l_ptr->owner,
- msg_last_bcast(msg));
-
- if (rec_gap || (msg_probe(msg))) {
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0,
- rec_gap, 0, 0);
- }
- if (msg_seq_gap(msg)) {
- l_ptr->stats.recv_nacks++;
- tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq),
- msg_seq_gap(msg));
- }
- break;
- }
-exit:
- kfree_skb(buf);
-}
-
-
/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
* a different bearer. Owner node is locked.
*/
struct sk_buff *skb;
u32 length = msg_size(msg);
- tunnel = l_ptr->owner->active_links[selector & 1];
+ tunnel = node_active_link(l_ptr->owner, selector & 1);
if (!tipc_link_is_up(tunnel)) {
pr_warn("%stunnel link no longer available\n", link_co_err);
return;
void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
{
int msgcount;
- struct tipc_link *tunnel = l_ptr->owner->active_links[0];
+ struct tipc_link *tunnel = node_active_link(l_ptr->owner, 0);
struct tipc_msg tunnel_hdr;
struct sk_buff *skb;
int split_bundles;
return;
}
- split_bundles = (l_ptr->owner->active_links[0] !=
- l_ptr->owner->active_links[1]);
+ split_bundles = (node_active_link(l_ptr->owner, 0) !=
+ node_active_link(l_ptr->owner, 0));
skb_queue_walk(&l_ptr->transmq, skb) {
struct tipc_msg *msg = buf_msg(skb);
/* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet
* Owner node is locked.
*/
-static bool tipc_link_failover_rcv(struct tipc_link *link,
- struct sk_buff **skb)
+static int tipc_link_failover_rcv(struct tipc_link *link,
+ struct sk_buff **skb)
{
struct tipc_msg *msg = buf_msg(*skb);
struct sk_buff *iskb = NULL;
struct tipc_link *pl = NULL;
int bearer_id = msg_bearer_id(msg);
int pos = 0;
+ int rc = 0;
if (msg_type(msg) != FAILOVER_MSG) {
pr_warn("%sunknown tunnel pkt received\n", link_co_err);
if (bearer_id == link->bearer_id)
goto exit;
- pl = link->owner->links[bearer_id];
- if (pl && tipc_link_is_up(pl))
- tipc_link_reset(pl);
+ pl = link->owner->links[bearer_id].link;
if (link->failover_pkts == FIRST_FAILOVER)
link->failover_pkts = msg_msgcnt(msg);
}
if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) {
link->stats.recv_fragments++;
- tipc_buf_append(&link->failover_skb, &iskb);
+ if (!tipc_buf_append(&link->failover_skb, &iskb) &&
+ !link->failover_skb) {
+ link->exec_mode = TIPC_LINK_BLOCKED;
+ rc |= TIPC_LINK_DOWN_EVT;
+ }
}
exit:
if (!link->failover_pkts && pl)
- pl->flags &= ~LINK_FAILINGOVER;
+ pl->exec_mode = TIPC_LINK_OPEN;
kfree_skb(*skb);
*skb = iskb;
- return *skb;
+ return rc;
}
-static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
+/* tipc_link_proto_rcv(): receive link level protocol message :
+ * Note that network plane id propagates through the network, and may
+ * change at any time. The node with lowest numerical id determines
+ * network plane
+ */
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq)
{
- unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
+ struct tipc_msg *hdr = buf_msg(skb);
+ u16 rcvgap = 0;
+ u16 nacked_gap = msg_seq_gap(hdr);
+ u16 peers_snd_nxt = msg_next_sent(hdr);
+ u16 peers_tol = msg_link_tolerance(hdr);
+ u16 peers_prio = msg_linkprio(hdr);
+ char *if_name;
+ int rc = 0;
- if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
- return;
+ if (l->exec_mode == TIPC_LINK_BLOCKED)
+ goto exit;
+
+ if (link_own_addr(l) > msg_prevnode(hdr))
+ l->net_plane = msg_net_plane(hdr);
+
+ switch (msg_type(hdr)) {
+ case RESET_MSG:
+
+ /* Ignore duplicate RESET with old session number */
+ if ((less_eq(msg_session(hdr), l->peer_session)) &&
+ (l->peer_session != WILDCARD_SESSION))
+ break;
+ /* fall thru' */
+ case ACTIVATE_MSG:
+
+ /* Complete own link name with peer's interface name */
+ if_name = strrchr(l->name, ':') + 1;
+ if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
+ break;
+ if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
+ break;
+ strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
- l_ptr->tolerance = tol;
- l_ptr->keepalive_intv = msecs_to_jiffies(intv);
- l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv));
+ /* 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;
+
+ /* Update own priority if peer's priority is higher */
+ if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
+ l->priority = peers_prio;
+
+ 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;
+
+ l->silent_intv_cnt = 0;
+ 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))
+ break;
+
+ /* Has peer sent packets 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)))
+ tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
+ 0, 0, xmitq);
+ tipc_link_release_pkts(l, msg_ack(hdr));
+
+ /* If NACK, retransmit will now start at right position */
+ if (nacked_gap) {
+ 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);
+ }
+exit:
+ kfree_skb(skb);
+ return rc;
}
void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
tipc_node_lock(n_ptr);
for (i = 0; i < MAX_BEARERS; i++) {
- l_ptr = n_ptr->links[i];
+ l_ptr = n_ptr->links[i].link;
if (l_ptr && !strcmp(l_ptr->name, link_name)) {
*bearer_id = i;
found_node = n_ptr;
l_ptr->stats.recv_info = l_ptr->rcv_nxt;
}
-static void link_print(struct tipc_link *l_ptr, const char *str)
+static void link_print(struct tipc_link *l, const char *str)
{
- struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id);
- struct tipc_bearer *b_ptr;
-
- rcu_read_lock();
- b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
- if (b_ptr)
- pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
- rcu_read_unlock();
-
- if (link_working_unknown(l_ptr))
- pr_cont(":WU\n");
- else if (link_reset_reset(l_ptr))
- pr_cont(":RR\n");
- else if (link_reset_unknown(l_ptr))
- pr_cont(":RU\n");
- else if (link_working_working(l_ptr))
- pr_cont(":WW\n");
+ struct sk_buff *hskb = skb_peek(&l->transmq);
+ 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("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);
}
/* Parse and validate nested (link) properties valid for media, bearer and link
tipc_node_lock(node);
- link = node->links[bearer_id];
+ link = node->links[bearer_id].link;
if (!link) {
res = -EINVAL;
goto out;
u32 tol;
tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
- link_set_supervision_props(link, tol);
+ link->tolerance = tol;
tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
}
if (props[TIPC_NLA_PROP_PRIO]) {
for (i = *prev_link; i < MAX_BEARERS; i++) {
*prev_link = i;
- if (!node->links[i])
+ if (!node->links[i].link)
continue;
- err = __tipc_nl_add_link(net, msg, node->links[i], NLM_F_MULTI);
+ err = __tipc_nl_add_link(net, msg,
+ node->links[i].link, NLM_F_MULTI);
if (err)
return err;
}
return -EINVAL;
tipc_node_lock(node);
- link = node->links[bearer_id];
+ link = node->links[bearer_id].link;
if (!link) {
tipc_node_unlock(node);
nlmsg_free(msg.skb);
tipc_node_lock(node);
- link = node->links[bearer_id];
+ link = node->links[bearer_id].link;
if (!link) {
tipc_node_unlock(node);
return -EINVAL;
projects / cascardo / linux.git / blobdiff