Merge branch 'tipc-next'
Jon Maloy says:
====================
tipc: remove some unnecessary complexity
The TIPC code is unnecessarily complex in some places, often because
the conditions or assumptions that were the cause for the complexity
are not valid anymore.
In these three commits, we eliminate some cases of such redundant
complexity.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index ae558dd..c5cbdcb 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -413,7 +413,7 @@
*/
if (((seqno - tn->own_addr) % TIPC_MIN_LINK_WIN) == 0) {
tipc_link_proto_xmit(node->active_links[node->addr & 1],
- STATE_MSG, 0, 0, 0, 0, 0);
+ STATE_MSG, 0, 0, 0, 0);
tn->bcl->stats.sent_acks++;
}
}
@@ -899,7 +899,7 @@
skb_queue_head_init(&bclink->inputq);
bcl->owner = &bclink->node;
bcl->owner->net = net;
- bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
+ bcl->mtu = MAX_PKT_DEFAULT_MCAST;
tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
bcl->bearer_id = MAX_BEARERS;
rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcbearer->bearer);
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 514466e..a6b30df 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -89,24 +89,14 @@
#define TIMEOUT_EVT 560817u /* link timer expired */
/*
- * The following two 'message types' is really just implementation
- * data conveniently stored in the message header.
- * They must not be considered part of the protocol
+ * State value stored in 'failover_pkts'
*/
-#define OPEN_MSG 0
-#define CLOSED_MSG 1
-
-/*
- * State value stored in 'exp_msg_count'
- */
-#define START_CHANGEOVER 100000u
+#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 int tipc_link_tunnel_rcv(struct tipc_node *node,
- 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);
@@ -115,7 +105,7 @@
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);
/*
* Simple link routines
*/
@@ -146,34 +136,6 @@
return l->owner->active_links[1];
}
-static void link_init_max_pkt(struct tipc_link *l_ptr)
-{
- struct tipc_node *node = l_ptr->owner;
- struct tipc_net *tn = net_generic(node->net, tipc_net_id);
- struct tipc_bearer *b_ptr;
- u32 max_pkt;
-
- rcu_read_lock();
- b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
- if (!b_ptr) {
- rcu_read_unlock();
- return;
- }
- max_pkt = (b_ptr->mtu & ~3);
- rcu_read_unlock();
-
- if (max_pkt > MAX_MSG_SIZE)
- max_pkt = MAX_MSG_SIZE;
-
- l_ptr->max_pkt_target = max_pkt;
- if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
- l_ptr->max_pkt = l_ptr->max_pkt_target;
- else
- l_ptr->max_pkt = MAX_PKT_DEFAULT;
-
- l_ptr->max_pkt_probes = 0;
-}
-
/*
* Simple non-static link routines (i.e. referenced outside this file)
*/
@@ -314,7 +276,8 @@
msg_set_bearer_id(msg, b_ptr->identity);
strcpy((char *)msg_data(msg), if_name);
l_ptr->net_plane = b_ptr->net_plane;
- link_init_max_pkt(l_ptr);
+ l_ptr->advertised_mtu = b_ptr->mtu;
+ l_ptr->mtu = l_ptr->advertised_mtu;
l_ptr->priority = b_ptr->priority;
tipc_link_set_queue_limits(l_ptr, b_ptr->window);
l_ptr->next_out_no = 1;
@@ -333,15 +296,19 @@
}
/**
- * link_delete - Conditional deletion of link.
- * If timer still running, real delete is done when it expires
- * @link: link to be deleted
+ * tipc_link_delete - Delete a link
+ * @l: link to be deleted
*/
-void tipc_link_delete(struct tipc_link *link)
+void tipc_link_delete(struct tipc_link *l)
{
- tipc_link_reset_fragments(link);
- tipc_node_detach_link(link->owner, link);
- tipc_link_put(link);
+ 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);
}
void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
@@ -350,23 +317,12 @@
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_link *link;
struct tipc_node *node;
- bool del_link;
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_node_unlock(node);
- continue;
- }
- del_link = !tipc_link_is_up(link) && !link->exp_msg_count;
- tipc_link_reset(link);
- if (del_timer(&link->timer))
- tipc_link_put(link);
- link->flags |= LINK_STOPPED;
- /* Delete link now, or when failover is finished: */
- if (shutting_down || !tipc_node_is_up(node) || del_link)
+ if (link)
tipc_link_delete(link);
tipc_node_unlock(node);
}
@@ -473,17 +429,17 @@
void tipc_link_reset(struct tipc_link *l_ptr)
{
u32 prev_state = l_ptr->state;
- u32 checkpoint = l_ptr->next_in_no;
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;
- /* Prepare for max packet size negotiation */
- link_init_max_pkt(l_ptr);
+ /* Prepare for renewed mtu size negotiation */
+ l_ptr->mtu = l_ptr->advertised_mtu;
l_ptr->state = RESET_UNKNOWN;
@@ -493,11 +449,15 @@
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_active_links(l_ptr->owner)) {
- l_ptr->reset_checkpoint = checkpoint;
- l_ptr->exp_msg_count = START_CHANGEOVER;
+ if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
+ l_ptr->flags |= LINK_FAILINGOVER;
+ l_ptr->failover_checkpt = l_ptr->next_in_no;
+ pl->failover_pkts = FIRST_FAILOVER;
+ pl->failover_checkpt = l_ptr->next_in_no;
+ pl->failover_skb = l_ptr->reasm_buf;
+ } else {
+ kfree_skb(l_ptr->reasm_buf);
}
-
/* Clean up all queues, except inputq: */
__skb_queue_purge(&l_ptr->transmq);
__skb_queue_purge(&l_ptr->deferdq);
@@ -507,6 +467,7 @@
if (!skb_queue_empty(owner->inputq))
owner->action_flags |= TIPC_MSG_EVT;
tipc_link_purge_backlog(l_ptr);
+ l_ptr->reasm_buf = NULL;
l_ptr->rcv_unacked = 0;
l_ptr->checkpoint = 1;
l_ptr->next_out_no = 1;
@@ -558,8 +519,7 @@
if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
return; /* Not yet. */
- /* Check whether changeover is going on */
- if (l_ptr->exp_msg_count) {
+ if (l_ptr->flags & LINK_FAILINGOVER) {
if (event == TIMEOUT_EVT)
link_set_timer(l_ptr, cont_intv);
return;
@@ -576,11 +536,7 @@
l_ptr->checkpoint = l_ptr->next_in_no;
if (tipc_bclink_acks_missing(l_ptr->owner)) {
tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 0, 0, 0, 0, 0);
- l_ptr->fsm_msg_cnt++;
- } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
- tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 1, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
}
link_set_timer(l_ptr, cont_intv);
@@ -588,7 +544,7 @@
}
l_ptr->state = WORKING_UNKNOWN;
l_ptr->fsm_msg_cnt = 0;
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv / 4);
break;
@@ -599,7 +555,7 @@
l_ptr->state = RESET_RESET;
l_ptr->fsm_msg_cnt = 0;
tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
break;
@@ -622,7 +578,7 @@
l_ptr->state = RESET_RESET;
l_ptr->fsm_msg_cnt = 0;
tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
break;
@@ -633,13 +589,13 @@
l_ptr->checkpoint = l_ptr->next_in_no;
if (tipc_bclink_acks_missing(l_ptr->owner)) {
tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
}
link_set_timer(l_ptr, cont_intv);
} else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
tipc_link_proto_xmit(l_ptr, STATE_MSG,
- 1, 0, 0, 0, 0);
+ 1, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv / 4);
} else { /* Link has failed */
@@ -649,7 +605,7 @@
l_ptr->state = RESET_UNKNOWN;
l_ptr->fsm_msg_cnt = 0;
tipc_link_proto_xmit(l_ptr, RESET_MSG,
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
}
@@ -669,7 +625,7 @@
l_ptr->state = WORKING_WORKING;
l_ptr->fsm_msg_cnt = 0;
link_activate(l_ptr);
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
if (l_ptr->owner->working_links == 1)
tipc_link_sync_xmit(l_ptr);
@@ -679,7 +635,7 @@
l_ptr->state = RESET_RESET;
l_ptr->fsm_msg_cnt = 0;
tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 1, 0, 0, 0, 0);
+ 1, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
break;
@@ -689,7 +645,7 @@
link_set_timer(l_ptr, cont_intv);
break;
case TIMEOUT_EVT:
- tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
+ tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
break;
@@ -707,7 +663,7 @@
l_ptr->state = WORKING_WORKING;
l_ptr->fsm_msg_cnt = 0;
link_activate(l_ptr);
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
if (l_ptr->owner->working_links == 1)
tipc_link_sync_xmit(l_ptr);
@@ -717,7 +673,7 @@
break;
case TIMEOUT_EVT:
tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
- 0, 0, 0, 0, 0);
+ 0, 0, 0, 0);
l_ptr->fsm_msg_cnt++;
link_set_timer(l_ptr, cont_intv);
break;
@@ -746,7 +702,7 @@
struct tipc_msg *msg = buf_msg(skb_peek(list));
unsigned int maxwin = link->window;
unsigned int imp = msg_importance(msg);
- uint mtu = link->max_pkt;
+ uint mtu = link->mtu;
uint ack = mod(link->next_in_no - 1);
uint seqno = link->next_out_no;
uint bc_last_in = link->owner->bclink.last_in;
@@ -1200,7 +1156,7 @@
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, 0);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
}
tipc_link_input(l_ptr, skb);
skb = NULL;
@@ -1243,7 +1199,7 @@
node->action_flags |= TIPC_NAMED_MSG_EVT;
return true;
case MSG_BUNDLER:
- case CHANGEOVER_PROTOCOL:
+ case TUNNEL_PROTOCOL:
case MSG_FRAGMENTER:
case BCAST_PROTOCOL:
return false;
@@ -1270,12 +1226,14 @@
return;
switch (msg_user(msg)) {
- case CHANGEOVER_PROTOCOL:
+ case TUNNEL_PROTOCOL:
if (msg_dup(msg)) {
link->flags |= LINK_SYNCHING;
link->synch_point = msg_seqno(msg_get_wrapped(msg));
+ kfree_skb(skb);
+ break;
}
- if (!tipc_link_tunnel_rcv(node, &skb))
+ if (!tipc_link_failover_rcv(link, &skb))
break;
if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {
tipc_data_input(link, skb);
@@ -1373,7 +1331,7 @@
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, 0);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
} else {
l_ptr->stats.duplicates++;
}
@@ -1383,15 +1341,15 @@
* Send protocol message to the other endpoint.
*/
void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
- u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
+ u32 gap, u32 tolerance, u32 priority)
{
struct sk_buff *buf = NULL;
struct tipc_msg *msg = l_ptr->pmsg;
u32 msg_size = sizeof(l_ptr->proto_msg);
int r_flag;
- /* Don't send protocol message during link changeover */
- if (l_ptr->exp_msg_count)
+ /* Don't send protocol message during link failover */
+ if (l_ptr->flags & LINK_FAILINGOVER)
return;
/* Abort non-RESET send if communication with node is prohibited */
@@ -1421,35 +1379,20 @@
l_ptr->stats.sent_nacks++;
msg_set_link_tolerance(msg, tolerance);
msg_set_linkprio(msg, priority);
- msg_set_max_pkt(msg, ack_mtu);
+ msg_set_max_pkt(msg, l_ptr->mtu);
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
msg_set_probe(msg, probe_msg != 0);
- if (probe_msg) {
- u32 mtu = l_ptr->max_pkt;
-
- if ((mtu < l_ptr->max_pkt_target) &&
- link_working_working(l_ptr) &&
- l_ptr->fsm_msg_cnt) {
- msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
- if (l_ptr->max_pkt_probes == 10) {
- l_ptr->max_pkt_target = (msg_size - 4);
- l_ptr->max_pkt_probes = 0;
- msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
- }
- l_ptr->max_pkt_probes++;
- }
-
+ 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->reset_checkpoint - 1));
+ 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->max_pkt_target);
+ msg_set_max_pkt(msg, l_ptr->advertised_mtu);
}
r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
@@ -1480,13 +1423,10 @@
struct sk_buff *buf)
{
u32 rec_gap = 0;
- u32 max_pkt_info;
- u32 max_pkt_ack;
u32 msg_tol;
struct tipc_msg *msg = buf_msg(buf);
- /* Discard protocol message during link changeover */
- if (l_ptr->exp_msg_count)
+ if (l_ptr->flags & LINK_FAILINGOVER)
goto exit;
if (l_ptr->net_plane != msg_net_plane(msg))
@@ -1525,15 +1465,8 @@
if (msg_linkprio(msg) > l_ptr->priority)
l_ptr->priority = msg_linkprio(msg);
- max_pkt_info = msg_max_pkt(msg);
- if (max_pkt_info) {
- if (max_pkt_info < l_ptr->max_pkt_target)
- l_ptr->max_pkt_target = max_pkt_info;
- if (l_ptr->max_pkt > l_ptr->max_pkt_target)
- l_ptr->max_pkt = l_ptr->max_pkt_target;
- } else {
- l_ptr->max_pkt = l_ptr->max_pkt_target;
- }
+ 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)) {
@@ -1578,18 +1511,8 @@
mod(l_ptr->next_in_no));
}
- max_pkt_ack = msg_max_pkt(msg);
- if (max_pkt_ack > l_ptr->max_pkt) {
- l_ptr->max_pkt = max_pkt_ack;
- l_ptr->max_pkt_probes = 0;
- }
-
- max_pkt_ack = 0;
- if (msg_probe(msg)) {
+ if (msg_probe(msg))
l_ptr->stats.recv_probes++;
- if (msg_size(msg) > sizeof(l_ptr->proto_msg))
- max_pkt_ack = msg_size(msg);
- }
/* Protocol message before retransmits, reduce loss risk */
if (l_ptr->owner->bclink.recv_permitted)
@@ -1597,8 +1520,8 @@
msg_last_bcast(msg));
if (rec_gap || (msg_probe(msg))) {
- tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, rec_gap, 0,
- 0, max_pkt_ack);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0,
+ rec_gap, 0, 0);
}
if (msg_seq_gap(msg)) {
l_ptr->stats.recv_nacks++;
@@ -1658,8 +1581,8 @@
if (!tunnel)
return;
- tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL,
- ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);
+ tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL,
+ FAILOVER_MSG, INT_H_SIZE, l_ptr->addr);
skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq);
tipc_link_purge_backlog(l_ptr);
msgcount = skb_queue_len(&l_ptr->transmq);
@@ -1721,8 +1644,8 @@
struct sk_buff_head *queue = &link->transmq;
int mcnt;
- tipc_msg_init(link_own_addr(link), &tnl_hdr, CHANGEOVER_PROTOCOL,
- DUPLICATE_MSG, INT_H_SIZE, link->addr);
+ tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL,
+ SYNCH_MSG, INT_H_SIZE, link->addr);
mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq);
msg_set_msgcnt(&tnl_hdr, mcnt);
msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id);
@@ -1755,101 +1678,63 @@
goto tunnel_queue;
}
-/* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet.
- * Owner node is locked.
- */
-static void tipc_link_dup_rcv(struct tipc_link *link,
- struct sk_buff *skb)
-{
- struct sk_buff *iskb;
- int pos = 0;
-
- if (!tipc_link_is_up(link))
- return;
-
- if (!tipc_msg_extract(skb, &iskb, &pos)) {
- pr_warn("%sfailed to extract inner dup pkt\n", link_co_err);
- return;
- }
- /* Append buffer to deferred queue, if applicable: */
- link_handle_out_of_seq_msg(link, iskb);
-}
-
-/* tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet
+/* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet
* Owner node is locked.
*/
-static struct sk_buff *tipc_link_failover_rcv(struct tipc_link *l_ptr,
- struct sk_buff *t_buf)
+static bool tipc_link_failover_rcv(struct tipc_link *link,
+ struct sk_buff **skb)
{
- struct tipc_msg *t_msg = buf_msg(t_buf);
- struct sk_buff *buf = NULL;
- struct tipc_msg *msg;
+ 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;
- if (tipc_link_is_up(l_ptr))
- tipc_link_reset(l_ptr);
-
- /* First failover packet? */
- if (l_ptr->exp_msg_count == START_CHANGEOVER)
- l_ptr->exp_msg_count = msg_msgcnt(t_msg);
-
- /* Should there be an inner packet? */
- if (l_ptr->exp_msg_count) {
- l_ptr->exp_msg_count--;
- if (!tipc_msg_extract(t_buf, &buf, &pos)) {
- pr_warn("%sno inner failover pkt\n", link_co_err);
- goto exit;
- }
- msg = buf_msg(buf);
-
- if (less(msg_seqno(msg), l_ptr->reset_checkpoint)) {
- kfree_skb(buf);
- buf = NULL;
- goto exit;
- }
- if (msg_user(msg) == MSG_FRAGMENTER) {
- l_ptr->stats.recv_fragments++;
- tipc_buf_append(&l_ptr->reasm_buf, &buf);
- }
+ if (msg_type(msg) != FAILOVER_MSG) {
+ pr_warn("%sunknown tunnel pkt received\n", link_co_err);
+ goto exit;
}
-exit:
- if ((!l_ptr->exp_msg_count) && (l_ptr->flags & LINK_STOPPED))
- tipc_link_delete(l_ptr);
- return buf;
-}
-
-/* tipc_link_tunnel_rcv(): Receive a tunnelled packet, sent
- * via other link as result of a failover (ORIGINAL_MSG) or
- * a new active link (DUPLICATE_MSG). Failover packets are
- * returned to the active link for delivery upwards.
- * Owner node is locked.
- */
-static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,
- struct sk_buff **buf)
-{
- struct sk_buff *t_buf = *buf;
- struct tipc_link *l_ptr;
- struct tipc_msg *t_msg = buf_msg(t_buf);
- u32 bearer_id = msg_bearer_id(t_msg);
-
- *buf = NULL;
-
if (bearer_id >= MAX_BEARERS)
goto exit;
- l_ptr = n_ptr->links[bearer_id];
- if (!l_ptr)
+ if (bearer_id == link->bearer_id)
goto exit;
- if (msg_type(t_msg) == DUPLICATE_MSG)
- tipc_link_dup_rcv(l_ptr, t_buf);
- else if (msg_type(t_msg) == ORIGINAL_MSG)
- *buf = tipc_link_failover_rcv(l_ptr, t_buf);
- else
- pr_warn("%sunknown tunnel pkt received\n", link_co_err);
+ pl = link->owner->links[bearer_id];
+ if (pl && tipc_link_is_up(pl))
+ tipc_link_reset(pl);
+
+ if (link->failover_pkts == FIRST_FAILOVER)
+ link->failover_pkts = msg_msgcnt(msg);
+
+ /* Should we expect an inner packet? */
+ if (!link->failover_pkts)
+ goto exit;
+
+ if (!tipc_msg_extract(*skb, &iskb, &pos)) {
+ pr_warn("%sno inner failover pkt\n", link_co_err);
+ *skb = NULL;
+ goto exit;
+ }
+ link->failover_pkts--;
+ *skb = NULL;
+
+ /* Was this packet already delivered? */
+ if (less(buf_seqno(iskb), link->failover_checkpt)) {
+ kfree_skb(iskb);
+ iskb = NULL;
+ goto exit;
+ }
+ if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) {
+ link->stats.recv_fragments++;
+ tipc_buf_append(&link->failover_skb, &iskb);
+ }
exit:
- kfree_skb(t_buf);
- return *buf != NULL;
+ if (!link->failover_pkts && pl)
+ pl->flags &= ~LINK_FAILINGOVER;
+ kfree_skb(*skb);
+ *skb = iskb;
+ return *skb;
}
static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
@@ -1866,7 +1751,7 @@
void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
{
- int max_bulk = TIPC_MAX_PUBLICATIONS / (l->max_pkt / ITEM_SIZE);
+ int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
l->window = win;
l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2;
@@ -2038,14 +1923,14 @@
tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
link_set_supervision_props(link, tol);
- tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0, 0);
+ tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
}
if (props[TIPC_NLA_PROP_PRIO]) {
u32 prio;
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
link->priority = prio;
- tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio, 0);
+ tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio);
}
if (props[TIPC_NLA_PROP_WIN]) {
u32 win;
@@ -2150,7 +2035,7 @@
if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
tipc_cluster_mask(tn->own_addr)))
goto attr_msg_full;
- if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->max_pkt))
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
goto attr_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
goto attr_msg_full;
diff --git a/net/tipc/link.h b/net/tipc/link.h
index d2b5663..b5b4e35 100644
--- a/net/tipc/link.h
+++ b/net/tipc/link.h
@@ -58,9 +58,10 @@
/* Link endpoint execution states
*/
-#define LINK_STARTED 0x0001
-#define LINK_STOPPED 0x0002
-#define LINK_SYNCHING 0x0004
+#define LINK_STARTED 0x0001
+#define LINK_STOPPED 0x0002
+#define LINK_SYNCHING 0x0004
+#define LINK_FAILINGOVER 0x0008
/* Starting value for maximum packet size negotiation on unicast links
* (unless bearer MTU is less)
@@ -122,9 +123,8 @@
* @backlog_limit: backlog queue congestion thresholds (indexed by importance)
* @exp_msg_count: # of tunnelled messages expected during link changeover
* @reset_checkpoint: seq # of last acknowledged message at time of link reset
- * @max_pkt: current maximum packet size for this link
- * @max_pkt_target: desired maximum packet size for this link
- * @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target)
+ * @mtu: current maximum packet size for this link
+ * @advertised_mtu: advertised own mtu when link is being established
* @transmitq: queue for sent, non-acked messages
* @backlogq: queue for messages waiting to be sent
* @next_out_no: next sequence number to use for outbound messages
@@ -167,16 +167,16 @@
struct tipc_msg *pmsg;
u32 priority;
char net_plane;
+ u16 synch_point;
- /* Changeover */
- u32 exp_msg_count;
- u32 reset_checkpoint;
- u32 synch_point;
+ /* Failover */
+ u16 failover_pkts;
+ u16 failover_checkpt;
+ struct sk_buff *failover_skb;
/* Max packet negotiation */
- u32 max_pkt;
- u32 max_pkt_target;
- u32 max_pkt_probes;
+ u16 mtu;
+ u16 advertised_mtu;
/* Sending */
struct sk_buff_head transmq;
@@ -201,7 +201,6 @@
struct sk_buff_head wakeupq;
/* Fragmentation/reassembly */
- u32 long_msg_seq_no;
struct sk_buff *reasm_buf;
/* Statistics */
@@ -232,7 +231,7 @@
int __tipc_link_xmit(struct net *net, struct tipc_link *link,
struct sk_buff_head *list);
void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob,
- u32 gap, u32 tolerance, u32 priority, u32 acked_mtu);
+ u32 gap, u32 tolerance, u32 priority);
void tipc_link_push_packets(struct tipc_link *l_ptr);
u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *buf);
void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index 3bb499c..c3e96e8 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -355,7 +355,7 @@
start = align(bsz);
pad = start - bsz;
- if (unlikely(msg_user(msg) == CHANGEOVER_PROTOCOL))
+ if (unlikely(msg_user(msg) == TUNNEL_PROTOCOL))
return false;
if (unlikely(msg_user(msg) == BCAST_PROTOCOL))
return false;
@@ -433,7 +433,7 @@
if (msg_user(msg) == MSG_FRAGMENTER)
return false;
- if (msg_user(msg) == CHANGEOVER_PROTOCOL)
+ if (msg_user(msg) == TUNNEL_PROTOCOL)
return false;
if (msg_user(msg) == BCAST_PROTOCOL)
return false;
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index d273207..e1d3595e 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -72,7 +72,7 @@
#define MSG_BUNDLER 6
#define LINK_PROTOCOL 7
#define CONN_MANAGER 8
-#define CHANGEOVER_PROTOCOL 10
+#define TUNNEL_PROTOCOL 10
#define NAME_DISTRIBUTOR 11
#define MSG_FRAGMENTER 12
#define LINK_CONFIG 13
@@ -512,8 +512,8 @@
/*
* Changeover tunnel message types
*/
-#define DUPLICATE_MSG 0
-#define ORIGINAL_MSG 1
+#define SYNCH_MSG 0
+#define FAILOVER_MSG 1
/*
* Config protocol message types
@@ -556,9 +556,9 @@
static inline bool msg_dup(struct tipc_msg *m)
{
- if (likely(msg_user(m) != CHANGEOVER_PROTOCOL))
+ if (likely(msg_user(m) != TUNNEL_PROTOCOL))
return false;
- if (msg_type(m) != DUPLICATE_MSG)
+ if (msg_type(m) != SYNCH_MSG)
return false;
return true;
}
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 3e4f048..22c059a 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -254,8 +254,8 @@
active[0] = active[1] = l_ptr;
exit:
/* Leave room for changeover header when returning 'mtu' to users: */
- n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE;
- n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE;
+ n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
+ n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
}
/**
@@ -319,11 +319,10 @@
/* Leave room for changeover header when returning 'mtu' to users: */
if (active[0]) {
- n_ptr->act_mtus[0] = active[0]->max_pkt - INT_H_SIZE;
- n_ptr->act_mtus[1] = active[1]->max_pkt - INT_H_SIZE;
+ n_ptr->act_mtus[0] = active[0]->mtu - INT_H_SIZE;
+ n_ptr->act_mtus[1] = active[1]->mtu - INT_H_SIZE;
return;
}
-
/* Loopback link went down? No fragmentation needed from now on. */
if (n_ptr->addr == tn->own_addr) {
n_ptr->act_mtus[0] = MAX_MSG_SIZE;
@@ -394,18 +393,17 @@
n_ptr->bclink.recv_permitted = false;
}
- /* Abort link changeover */
+ /* Abort any ongoing link failover */
for (i = 0; i < MAX_BEARERS; i++) {
struct tipc_link *l_ptr = n_ptr->links[i];
if (!l_ptr)
continue;
- l_ptr->reset_checkpoint = l_ptr->next_in_no;
- l_ptr->exp_msg_count = 0;
+ l_ptr->flags &= ~LINK_FAILINGOVER;
+ l_ptr->failover_checkpt = 0;
+ l_ptr->failover_pkts = 0;
+ kfree_skb(l_ptr->failover_skb);
+ l_ptr->failover_skb = NULL;
tipc_link_reset_fragments(l_ptr);
-
- /* Link marked for deletion after failover? => do it now */
- if (l_ptr->flags & LINK_STOPPED)
- tipc_link_delete(l_ptr);
}
n_ptr->action_flags &= ~TIPC_WAIT_OWN_LINKS_DOWN;