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Diffstat (limited to 'net/tipc/link.c')
-rw-r--r--net/tipc/link.c228
1 files changed, 172 insertions, 56 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 784b24b6d10..c6831c75cfa 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -2,7 +2,7 @@
* net/tipc/link.c: TIPC link code
*
* Copyright (c) 1996-2006, Ericsson AB
- * Copyright (c) 2004-2005, Wind River Systems
+ * Copyright (c) 2004-2006, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -419,7 +419,7 @@ struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
l_ptr = (struct link *)kmalloc(sizeof(*l_ptr), GFP_ATOMIC);
if (!l_ptr) {
- warn("Memory squeeze; Failed to create link\n");
+ warn("Link creation failed, no memory\n");
return NULL;
}
memset(l_ptr, 0, sizeof(*l_ptr));
@@ -469,7 +469,7 @@ struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
if (!pb) {
kfree(l_ptr);
- warn("Memory squeeze; Failed to create link\n");
+ warn("Link creation failed, no memory for print buffer\n");
return NULL;
}
tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
@@ -574,7 +574,6 @@ void tipc_link_wakeup_ports(struct link *l_ptr, int all)
break;
list_del_init(&p_ptr->wait_list);
p_ptr->congested_link = NULL;
- assert(p_ptr->wakeup);
spin_lock_bh(p_ptr->publ.lock);
p_ptr->publ.congested = 0;
p_ptr->wakeup(&p_ptr->publ);
@@ -691,6 +690,7 @@ void tipc_link_reset(struct link *l_ptr)
struct sk_buff *buf;
u32 prev_state = l_ptr->state;
u32 checkpoint = l_ptr->next_in_no;
+ int was_active_link = tipc_link_is_active(l_ptr);
msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
@@ -712,7 +712,7 @@ void tipc_link_reset(struct link *l_ptr)
tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
dbg_link_dump();
#endif
- if (tipc_node_has_active_links(l_ptr->owner) &&
+ if (was_active_link && tipc_node_has_active_links(l_ptr->owner) &&
l_ptr->owner->permit_changeover) {
l_ptr->reset_checkpoint = checkpoint;
l_ptr->exp_msg_count = START_CHANGEOVER;
@@ -755,7 +755,7 @@ void tipc_link_reset(struct link *l_ptr)
static void link_activate(struct link *l_ptr)
{
- l_ptr->next_in_no = 1;
+ l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
tipc_node_link_up(l_ptr->owner, l_ptr);
tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
link_send_event(tipc_cfg_link_event, l_ptr, 1);
@@ -820,6 +820,8 @@ static void link_state_event(struct link *l_ptr, unsigned event)
break;
case RESET_MSG:
dbg_link("RES -> RR\n");
+ info("Resetting link <%s>, requested by peer\n",
+ l_ptr->name);
tipc_link_reset(l_ptr);
l_ptr->state = RESET_RESET;
l_ptr->fsm_msg_cnt = 0;
@@ -844,6 +846,8 @@ static void link_state_event(struct link *l_ptr, unsigned event)
break;
case RESET_MSG:
dbg_link("RES -> RR\n");
+ info("Resetting link <%s>, requested by peer "
+ "while probing\n", l_ptr->name);
tipc_link_reset(l_ptr);
l_ptr->state = RESET_RESET;
l_ptr->fsm_msg_cnt = 0;
@@ -875,6 +879,8 @@ static void link_state_event(struct link *l_ptr, unsigned event)
} else { /* Link has failed */
dbg_link("-> RU (%u probes unanswered)\n",
l_ptr->fsm_msg_cnt);
+ warn("Resetting link <%s>, peer not responding\n",
+ l_ptr->name);
tipc_link_reset(l_ptr);
l_ptr->state = RESET_UNKNOWN;
l_ptr->fsm_msg_cnt = 0;
@@ -982,17 +988,18 @@ static int link_bundle_buf(struct link *l_ptr,
struct tipc_msg *bundler_msg = buf_msg(bundler);
struct tipc_msg *msg = buf_msg(buf);
u32 size = msg_size(msg);
- u32 to_pos = align(msg_size(bundler_msg));
- u32 rest = link_max_pkt(l_ptr) - to_pos;
+ u32 bundle_size = msg_size(bundler_msg);
+ u32 to_pos = align(bundle_size);
+ u32 pad = to_pos - bundle_size;
if (msg_user(bundler_msg) != MSG_BUNDLER)
return 0;
if (msg_type(bundler_msg) != OPEN_MSG)
return 0;
- if (rest < align(size))
+ if (skb_tailroom(bundler) < (pad + size))
return 0;
- skb_put(bundler, (to_pos - msg_size(bundler_msg)) + size);
+ skb_put(bundler, pad + size);
memcpy(bundler->data + to_pos, buf->data, size);
msg_set_size(bundler_msg, to_pos + size);
msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
@@ -1050,7 +1057,7 @@ int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
msg_dbg(msg, "TIPC: Congestion, throwing away\n");
buf_discard(buf);
if (imp > CONN_MANAGER) {
- warn("Resetting <%s>, send queue full", l_ptr->name);
+ warn("Resetting link <%s>, send queue full", l_ptr->name);
tipc_link_reset(l_ptr);
}
return dsz;
@@ -1135,9 +1142,13 @@ int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
if (n_ptr) {
tipc_node_lock(n_ptr);
l_ptr = n_ptr->active_links[selector & 1];
- dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
if (l_ptr) {
+ dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
res = tipc_link_send_buf(l_ptr, buf);
+ } else {
+ dbg("Attempt to send msg to unreachable node:\n");
+ msg_dbg(buf_msg(buf),">>>");
+ buf_discard(buf);
}
tipc_node_unlock(n_ptr);
} else {
@@ -1242,8 +1253,6 @@ int tipc_link_send_sections_fast(struct port *sender,
int res;
u32 selector = msg_origport(hdr) & 1;
- assert(destaddr != tipc_own_addr);
-
again:
/*
* Try building message using port's max_pkt hint.
@@ -1604,40 +1613,121 @@ void tipc_link_push_queue(struct link *l_ptr)
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
}
+static void link_reset_all(unsigned long addr)
+{
+ struct node *n_ptr;
+ char addr_string[16];
+ u32 i;
+
+ read_lock_bh(&tipc_net_lock);
+ n_ptr = tipc_node_find((u32)addr);
+ if (!n_ptr) {
+ read_unlock_bh(&tipc_net_lock);
+ return; /* node no longer exists */
+ }
+
+ tipc_node_lock(n_ptr);
+
+ warn("Resetting all links to %s\n",
+ addr_string_fill(addr_string, n_ptr->addr));
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (n_ptr->links[i]) {
+ link_print(n_ptr->links[i], TIPC_OUTPUT,
+ "Resetting link\n");
+ tipc_link_reset(n_ptr->links[i]);
+ }
+ }
+
+ tipc_node_unlock(n_ptr);
+ read_unlock_bh(&tipc_net_lock);
+}
+
+static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
+{
+ struct tipc_msg *msg = buf_msg(buf);
+
+ warn("Retransmission failure on link <%s>\n", l_ptr->name);
+ tipc_msg_print(TIPC_OUTPUT, msg, ">RETR-FAIL>");
+
+ if (l_ptr->addr) {
+
+ /* Handle failure on standard link */
+
+ link_print(l_ptr, TIPC_OUTPUT, "Resetting link\n");
+ tipc_link_reset(l_ptr);
+
+ } else {
+
+ /* Handle failure on broadcast link */
+
+ struct node *n_ptr;
+ char addr_string[16];
+
+ tipc_printf(TIPC_OUTPUT, "Msg seq number: %u, ", msg_seqno(msg));
+ tipc_printf(TIPC_OUTPUT, "Outstanding acks: %u\n", (u32)TIPC_SKB_CB(buf)->handle);
+
+ n_ptr = l_ptr->owner->next;
+ tipc_node_lock(n_ptr);
+
+ addr_string_fill(addr_string, n_ptr->addr);
+ tipc_printf(TIPC_OUTPUT, "Multicast link info for %s\n", addr_string);
+ tipc_printf(TIPC_OUTPUT, "Supported: %d, ", n_ptr->bclink.supported);
+ tipc_printf(TIPC_OUTPUT, "Acked: %u\n", n_ptr->bclink.acked);
+ tipc_printf(TIPC_OUTPUT, "Last in: %u, ", n_ptr->bclink.last_in);
+ tipc_printf(TIPC_OUTPUT, "Gap after: %u, ", n_ptr->bclink.gap_after);
+ tipc_printf(TIPC_OUTPUT, "Gap to: %u\n", n_ptr->bclink.gap_to);
+ tipc_printf(TIPC_OUTPUT, "Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
+
+ tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
+
+ tipc_node_unlock(n_ptr);
+
+ l_ptr->stale_count = 0;
+ }
+}
+
void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
u32 retransmits)
{
struct tipc_msg *msg;
+ if (!buf)
+ return;
+
+ msg = buf_msg(buf);
+
dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
- if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr) && buf && !skb_cloned(buf)) {
- msg_dbg(buf_msg(buf), ">NO_RETR->BCONG>");
- dbg_print_link(l_ptr, " ");
- l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
- l_ptr->retransm_queue_size = retransmits;
- return;
+ if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
+ if (!skb_cloned(buf)) {
+ msg_dbg(msg, ">NO_RETR->BCONG>");
+ dbg_print_link(l_ptr, " ");
+ l_ptr->retransm_queue_head = msg_seqno(msg);
+ l_ptr->retransm_queue_size = retransmits;
+ return;
+ } else {
+ /* Don't retransmit if driver already has the buffer */
+ }
+ } else {
+ /* Detect repeated retransmit failures on uncongested bearer */
+
+ if (l_ptr->last_retransmitted == msg_seqno(msg)) {
+ if (++l_ptr->stale_count > 100) {
+ link_retransmit_failure(l_ptr, buf);
+ return;
+ }
+ } else {
+ l_ptr->last_retransmitted = msg_seqno(msg);
+ l_ptr->stale_count = 1;
+ }
}
+
while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
msg = buf_msg(buf);
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
- /* Catch if retransmissions fail repeatedly: */
- if (l_ptr->last_retransmitted == msg_seqno(msg)) {
- if (++l_ptr->stale_count > 100) {
- tipc_msg_print(TIPC_CONS, buf_msg(buf), ">RETR>");
- info("...Retransmitted %u times\n",
- l_ptr->stale_count);
- link_print(l_ptr, TIPC_CONS, "Resetting Link\n");
- tipc_link_reset(l_ptr);
- break;
- }
- } else {
- l_ptr->stale_count = 0;
- }
- l_ptr->last_retransmitted = msg_seqno(msg);
-
msg_dbg(buf_msg(buf), ">RETR>");
buf = buf->next;
retransmits--;
@@ -1650,6 +1740,7 @@ void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
return;
}
}
+
l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
}
@@ -1720,6 +1811,11 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
link_recv_non_seq(buf);
continue;
}
+
+ if (unlikely(!msg_short(msg) &&
+ (msg_destnode(msg) != tipc_own_addr)))
+ goto cont;
+
n_ptr = tipc_node_find(msg_prevnode(msg));
if (unlikely(!n_ptr))
goto cont;
@@ -2140,7 +2236,7 @@ static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
if (msg_linkprio(msg) &&
(msg_linkprio(msg) != l_ptr->priority)) {
- warn("Changing prio <%s>: %u->%u\n",
+ warn("Resetting link <%s>, priority change %u->%u\n",
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 */
@@ -2209,17 +2305,22 @@ void tipc_link_tunnel(struct link *l_ptr,
u32 length = msg_size(msg);
tunnel = l_ptr->owner->active_links[selector & 1];
- if (!tipc_link_is_up(tunnel))
+ if (!tipc_link_is_up(tunnel)) {
+ warn("Link changeover error, "
+ "tunnel link no longer available\n");
return;
+ }
msg_set_size(tunnel_hdr, length + INT_H_SIZE);
buf = buf_acquire(length + INT_H_SIZE);
- if (!buf)
+ if (!buf) {
+ warn("Link changeover error, "
+ "unable to send tunnel msg\n");
return;
+ }
memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
msg_dbg(buf_msg(buf), ">SEND>");
- assert(tunnel);
tipc_link_send_buf(tunnel, buf);
}
@@ -2235,23 +2336,27 @@ void tipc_link_changeover(struct link *l_ptr)
u32 msgcount = l_ptr->out_queue_size;
struct sk_buff *crs = l_ptr->first_out;
struct link *tunnel = l_ptr->owner->active_links[0];
- int split_bundles = tipc_node_has_redundant_links(l_ptr->owner);
struct tipc_msg tunnel_hdr;
+ int split_bundles;
if (!tunnel)
return;
- if (!l_ptr->owner->permit_changeover)
+ if (!l_ptr->owner->permit_changeover) {
+ warn("Link changeover error, "
+ "peer did not permit changeover\n");
return;
+ }
msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
msg_set_msgcnt(&tunnel_hdr, msgcount);
+ dbg("Link changeover requires %u tunnel messages\n", msgcount);
+
if (!l_ptr->first_out) {
struct sk_buff *buf;
- assert(!msgcount);
buf = buf_acquire(INT_H_SIZE);
if (buf) {
memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
@@ -2261,10 +2366,15 @@ void tipc_link_changeover(struct link *l_ptr)
msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
tipc_link_send_buf(tunnel, buf);
} else {
- warn("Memory squeeze; link changeover failed\n");
+ warn("Link changeover error, "
+ "unable to send changeover msg\n");
}
return;
}
+
+ split_bundles = (l_ptr->owner->active_links[0] !=
+ l_ptr->owner->active_links[1]);
+
while (crs) {
struct tipc_msg *msg = buf_msg(crs);
@@ -2310,7 +2420,8 @@ void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
outbuf = buf_acquire(length + INT_H_SIZE);
if (outbuf == NULL) {
- warn("Memory squeeze; buffer duplication failed\n");
+ warn("Link changeover error, "
+ "unable to send duplicate msg\n");
return;
}
memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
@@ -2364,11 +2475,15 @@ static int link_recv_changeover_msg(struct link **l_ptr,
u32 msg_count = msg_msgcnt(tunnel_msg);
dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
- assert(dest_link != *l_ptr);
if (!dest_link) {
msg_dbg(tunnel_msg, "NOLINK/<REC<");
goto exit;
}
+ if (dest_link == *l_ptr) {
+ err("Unexpected changeover message on link <%s>\n",
+ (*l_ptr)->name);
+ goto exit;
+ }
dbg("%c<-%c:", dest_link->b_ptr->net_plane,
(*l_ptr)->b_ptr->net_plane);
*l_ptr = dest_link;
@@ -2381,7 +2496,7 @@ static int link_recv_changeover_msg(struct link **l_ptr,
}
*buf = buf_extract(tunnel_buf,INT_H_SIZE);
if (*buf == NULL) {
- warn("Memory squeeze; failed to extract msg\n");
+ warn("Link changeover error, duplicate msg dropped\n");
goto exit;
}
msg_dbg(tunnel_msg, "TNL<REC<");
@@ -2393,13 +2508,17 @@ static int link_recv_changeover_msg(struct link **l_ptr,
if (tipc_link_is_up(dest_link)) {
msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
+ info("Resetting link <%s>, changeover initiated by peer\n",
+ dest_link->name);
tipc_link_reset(dest_link);
dest_link->exp_msg_count = msg_count;
+ dbg("Expecting %u tunnelled messages\n", msg_count);
if (!msg_count)
goto exit;
} else if (dest_link->exp_msg_count == START_CHANGEOVER) {
msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
dest_link->exp_msg_count = msg_count;
+ dbg("Expecting %u tunnelled messages\n", msg_count);
if (!msg_count)
goto exit;
}
@@ -2407,6 +2526,8 @@ static int link_recv_changeover_msg(struct link **l_ptr,
/* Receive original message */
if (dest_link->exp_msg_count == 0) {
+ warn("Link switchover error, "
+ "got too many tunnelled messages\n");
msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
dbg_print_link(dest_link, "LINK:");
goto exit;
@@ -2422,7 +2543,7 @@ static int link_recv_changeover_msg(struct link **l_ptr,
buf_discard(tunnel_buf);
return 1;
} else {
- warn("Memory squeeze; dropped incoming msg\n");
+ warn("Link changeover error, original msg dropped\n");
}
}
exit:
@@ -2444,13 +2565,8 @@ void tipc_link_recv_bundle(struct sk_buff *buf)
while (msgcount--) {
obuf = buf_extract(buf, pos);
if (obuf == NULL) {
- char addr_string[16];
-
- warn("Buffer allocation failure;\n");
- warn(" incoming message(s) from %s lost\n",
- addr_string_fill(addr_string,
- msg_orignode(buf_msg(buf))));
- return;
+ warn("Link unable to unbundle message(s)\n");
+ break;
};
pos += align(msg_size(buf_msg(obuf)));
msg_dbg(buf_msg(obuf), " /");
@@ -2508,7 +2624,7 @@ int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
}
fragm = buf_acquire(fragm_sz + INT_H_SIZE);
if (fragm == NULL) {
- warn("Memory squeeze; failed to fragment msg\n");
+ warn("Link unable to fragment message\n");
dsz = -ENOMEM;
goto exit;
}
@@ -2623,7 +2739,7 @@ int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
set_fragm_size(pbuf,fragm_sz);
set_expected_frags(pbuf,exp_fragm_cnt - 1);
} else {
- warn("Memory squeeze; got no defragmenting buffer\n");
+ warn("Link unable to reassemble fragmented message\n");
}
buf_discard(fbuf);
return 0;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-01 17:58:43 +0000