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-rw-r--r--net/tipc/link.c220
1 files changed, 173 insertions, 47 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c
index 836727e363c4..2792a3cae682 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -43,6 +43,7 @@
#include "discover.h"
#include "netlink.h"
#include "monitor.h"
+#include "trace.h"
#include <linux/pkt_sched.h>
@@ -105,7 +106,7 @@ struct tipc_stats {
* @transmitq: queue for sent, non-acked messages
* @backlogq: queue for messages waiting to be sent
* @snt_nxt: next sequence number to use for outbound messages
- * @last_retransmitted: sequence number of most recently retransmitted message
+ * @prev_from: sequence number of most previous retransmission request
* @stale_cnt: counter for number of identical retransmit attempts
* @stale_limit: time when repeated identical retransmits must force link reset
* @ackers: # of peers that needs to ack each packet before it can be released
@@ -163,7 +164,7 @@ struct tipc_link {
u16 limit;
} backlog[5];
u16 snd_nxt;
- u16 last_retransm;
+ u16 prev_from;
u16 window;
u16 stale_cnt;
unsigned long stale_limit;
@@ -186,9 +187,6 @@ struct tipc_link {
u16 acked;
struct tipc_link *bc_rcvlink;
struct tipc_link *bc_sndlink;
- unsigned long prev_retr;
- u16 prev_from;
- u16 prev_to;
u8 nack_state;
bool bc_peer_is_up;
@@ -210,7 +208,7 @@ enum {
BC_NACK_SND_SUPPRESS,
};
-#define TIPC_BC_RETR_LIMIT 10 /* [ms] */
+#define TIPC_BC_RETR_LIM msecs_to_jiffies(10) /* [ms] */
/*
* Interval between NACKs when packets arrive out of order
@@ -359,9 +357,11 @@ void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
rcv_l->bc_peer_is_up = true;
rcv_l->state = LINK_ESTABLISHED;
tipc_link_bc_ack_rcv(rcv_l, ack, xmitq);
+ trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!");
tipc_link_reset(rcv_l);
rcv_l->state = LINK_RESET;
if (!snd_l->ackers) {
+ trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!");
tipc_link_reset(snd_l);
snd_l->state = LINK_RESET;
__skb_queue_purge(xmitq);
@@ -525,6 +525,7 @@ bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
l = *link;
strcpy(l->name, tipc_bclink_name);
+ trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!");
tipc_link_reset(l);
l->state = LINK_RESET;
l->ackers = 0;
@@ -549,6 +550,7 @@ bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer,
int tipc_link_fsm_evt(struct tipc_link *l, int evt)
{
int rc = 0;
+ int old_state = l->state;
switch (l->state) {
case LINK_RESETTING:
@@ -695,10 +697,12 @@ int tipc_link_fsm_evt(struct tipc_link *l, int evt)
default:
pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
}
+ trace_tipc_link_fsm(l->name, old_state, l->state, evt);
return rc;
illegal_evt:
pr_err("Illegal FSM event %x in state %x on link %s\n",
evt, l->state, l->name);
+ trace_tipc_link_fsm(l->name, old_state, l->state, evt);
return rc;
}
@@ -743,6 +747,18 @@ static void link_profile_stats(struct tipc_link *l)
l->stats.msg_length_profile[6]++;
}
+/**
+ * tipc_link_too_silent - check if link is "too silent"
+ * @l: tipc link to be checked
+ *
+ * Returns true if the link 'silent_intv_cnt' is about to reach the
+ * 'abort_limit' value, otherwise false
+ */
+bool tipc_link_too_silent(struct tipc_link *l)
+{
+ return (l->silent_intv_cnt + 2 > l->abort_limit);
+}
+
/* tipc_link_timeout - perform periodic task as instructed from node timeout
*/
int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
@@ -756,6 +772,8 @@ int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
u16 bc_acked = l->bc_rcvlink->acked;
struct tipc_mon_state *mstate = &l->mon_state;
+ trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " ");
+ trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " ");
switch (l->state) {
case LINK_ESTABLISHED:
case LINK_SYNCHING:
@@ -818,6 +836,7 @@ static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr)
TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr);
skb_queue_tail(&l->wakeupq, skb);
l->stats.link_congs++;
+ trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!");
return -ELINKCONG;
}
@@ -948,6 +967,10 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
}
__skb_dequeue(list);
__skb_queue_tail(transmq, skb);
+ /* next retransmit attempt */
+ if (link_is_bc_sndlink(l))
+ TIPC_SKB_CB(skb)->nxt_retr =
+ jiffies + TIPC_BC_RETR_LIM;
__skb_queue_tail(xmitq, _skb);
TIPC_SKB_CB(skb)->ackers = l->ackers;
l->rcv_unacked = 0;
@@ -995,6 +1018,10 @@ static void tipc_link_advance_backlog(struct tipc_link *l,
hdr = buf_msg(skb);
l->backlog[msg_importance(hdr)].len--;
__skb_queue_tail(&l->transmq, skb);
+ /* next retransmit attempt */
+ if (link_is_bc_sndlink(l))
+ TIPC_SKB_CB(skb)->nxt_retr = jiffies + TIPC_BC_RETR_LIM;
+
__skb_queue_tail(xmitq, _skb);
TIPC_SKB_CB(skb)->ackers = l->ackers;
msg_set_seqno(hdr, seqno);
@@ -1036,14 +1063,20 @@ static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r,
if (!skb)
return 0;
+ if (less(to, from))
+ return 0;
+ trace_tipc_link_retrans(r, from, to, &l->transmq);
/* Detect repeated retransmit failures on same packet */
- if (r->last_retransm != buf_seqno(skb)) {
- r->last_retransm = buf_seqno(skb);
+ if (r->prev_from != from) {
+ r->prev_from = from;
r->stale_limit = jiffies + msecs_to_jiffies(r->tolerance);
r->stale_cnt = 0;
} else if (++r->stale_cnt > 99 && time_after(jiffies, r->stale_limit)) {
link_retransmit_failure(l, skb);
+ trace_tipc_list_dump(&l->transmq, true, "retrans failure!");
+ trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!");
+ trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!");
if (link_is_bc_sndlink(l))
return TIPC_LINK_DOWN_EVT;
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
@@ -1055,6 +1088,11 @@ static int tipc_link_retrans(struct tipc_link *l, struct tipc_link *r,
continue;
if (more(msg_seqno(hdr), to))
break;
+ if (link_is_bc_sndlink(l)) {
+ if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr))
+ continue;
+ TIPC_SKB_CB(skb)->nxt_retr = jiffies + TIPC_BC_RETR_LIM;
+ }
_skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
if (!_skb)
return 0;
@@ -1398,6 +1436,7 @@ static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
l->stats.sent_nacks++;
skb->priority = TC_PRIO_CONTROL;
__skb_queue_tail(xmitq, skb);
+ trace_tipc_proto_build(skb, false, l->name);
}
void tipc_link_create_dummy_tnl_msg(struct tipc_link *l,
@@ -1561,6 +1600,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
char *if_name;
int rc = 0;
+ trace_tipc_proto_rcv(skb, false, l->name);
if (tipc_link_is_blocked(l) || !xmitq)
goto exit;
@@ -1571,8 +1611,11 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
hdr = buf_msg(skb);
data = msg_data(hdr);
- if (!tipc_link_validate_msg(l, hdr))
+ if (!tipc_link_validate_msg(l, hdr)) {
+ trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!");
+ trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!");
goto exit;
+ }
switch (mtyp) {
case RESET_MSG:
@@ -1737,42 +1780,6 @@ void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr)
l->rcv_nxt = peers_snd_nxt;
}
-/* link_bc_retr eval()- check if the indicated range can be retransmitted now
- * - Adjust permitted range if there is overlap with previous retransmission
- */
-static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to)
-{
- unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr);
-
- if (less(*to, *from))
- return false;
-
- /* New retransmission request */
- if ((elapsed > TIPC_BC_RETR_LIMIT) ||
- less(*to, l->prev_from) || more(*from, l->prev_to)) {
- l->prev_from = *from;
- l->prev_to = *to;
- l->prev_retr = jiffies;
- return true;
- }
-
- /* Inside range of previous retransmit */
- if (!less(*from, l->prev_from) && !more(*to, l->prev_to))
- return false;
-
- /* Fully or partially outside previous range => exclude overlap */
- if (less(*from, l->prev_from)) {
- *to = l->prev_from - 1;
- l->prev_from = *from;
- }
- if (more(*to, l->prev_to)) {
- *from = l->prev_to + 1;
- l->prev_to = *to;
- }
- l->prev_retr = jiffies;
- return true;
-}
-
/* tipc_link_bc_sync_rcv - update rcv link according to peer's send state
*/
int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
@@ -1803,8 +1810,7 @@ int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
if (more(peers_snd_nxt, l->rcv_nxt + l->window))
return rc;
- if (link_bc_retr_eval(snd_l, &from, &to))
- rc = tipc_link_retrans(snd_l, l, from, to, xmitq);
+ rc = tipc_link_retrans(snd_l, l, from, to, xmitq);
l->snd_nxt = peers_snd_nxt;
if (link_bc_rcv_gap(l))
@@ -1852,6 +1858,7 @@ void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked,
if (!more(acked, l->acked))
return;
+ trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq);
/* Skip over packets peer has already acked */
skb_queue_walk(&snd_l->transmq, skb) {
if (more(buf_seqno(skb), l->acked))
@@ -2255,3 +2262,122 @@ void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
{
l->abort_limit = limit;
}
+
+char *tipc_link_name_ext(struct tipc_link *l, char *buf)
+{
+ if (!l)
+ scnprintf(buf, TIPC_MAX_LINK_NAME, "null");
+ else if (link_is_bc_sndlink(l))
+ scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender");
+ else if (link_is_bc_rcvlink(l))
+ scnprintf(buf, TIPC_MAX_LINK_NAME,
+ "broadcast-receiver, peer %x", l->addr);
+ else
+ memcpy(buf, l->name, TIPC_MAX_LINK_NAME);
+
+ return buf;
+}
+
+/**
+ * tipc_link_dump - dump TIPC link data
+ * @l: tipc link to be dumped
+ * @dqueues: bitmask to decide if any link queue to be dumped?
+ * - TIPC_DUMP_NONE: don't dump link queues
+ * - TIPC_DUMP_TRANSMQ: dump link transmq queue
+ * - TIPC_DUMP_BACKLOGQ: dump link backlog queue
+ * - TIPC_DUMP_DEFERDQ: dump link deferd queue
+ * - TIPC_DUMP_INPUTQ: dump link input queue
+ * - TIPC_DUMP_WAKEUP: dump link wakeup queue
+ * - TIPC_DUMP_ALL: dump all the link queues above
+ * @buf: returned buffer of dump data in format
+ */
+int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf)
+{
+ int i = 0;
+ size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN;
+ struct sk_buff_head *list;
+ struct sk_buff *hskb, *tskb;
+ u32 len;
+
+ if (!l) {
+ i += scnprintf(buf, sz, "link data: (null)\n");
+ return i;
+ }
+
+ i += scnprintf(buf, sz, "link data: %x", l->addr);
+ i += scnprintf(buf + i, sz - i, " %x", l->state);
+ i += scnprintf(buf + i, sz - i, " %u", l->in_session);
+ i += scnprintf(buf + i, sz - i, " %u", l->session);
+ i += scnprintf(buf + i, sz - i, " %u", l->peer_session);
+ i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt);
+ i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt);
+ i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state);
+ i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state);
+ i += scnprintf(buf + i, sz - i, " %x", l->peer_caps);
+ i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt);
+ i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt);
+ i += scnprintf(buf + i, sz - i, " %u", l->prev_from);
+ i += scnprintf(buf + i, sz - i, " %u", l->stale_cnt);
+ i += scnprintf(buf + i, sz - i, " %u", l->acked);
+
+ list = &l->transmq;
+ len = skb_queue_len(list);
+ hskb = skb_peek(list);
+ tskb = skb_peek_tail(list);
+ i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
+ (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
+ (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
+
+ list = &l->deferdq;
+ len = skb_queue_len(list);
+ hskb = skb_peek(list);
+ tskb = skb_peek_tail(list);
+ i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
+ (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
+ (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
+
+ list = &l->backlogq;
+ len = skb_queue_len(list);
+ hskb = skb_peek(list);
+ tskb = skb_peek_tail(list);
+ i += scnprintf(buf + i, sz - i, " | %u %u %u", len,
+ (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
+ (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
+
+ list = l->inputq;
+ len = skb_queue_len(list);
+ hskb = skb_peek(list);
+ tskb = skb_peek_tail(list);
+ i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len,
+ (hskb) ? msg_seqno(buf_msg(hskb)) : 0,
+ (tskb) ? msg_seqno(buf_msg(tskb)) : 0);
+
+ if (dqueues & TIPC_DUMP_TRANSMQ) {
+ i += scnprintf(buf + i, sz - i, "transmq: ");
+ i += tipc_list_dump(&l->transmq, false, buf + i);
+ }
+ if (dqueues & TIPC_DUMP_BACKLOGQ) {
+ i += scnprintf(buf + i, sz - i,
+ "backlogq: <%u %u %u %u %u>, ",
+ l->backlog[TIPC_LOW_IMPORTANCE].len,
+ l->backlog[TIPC_MEDIUM_IMPORTANCE].len,
+ l->backlog[TIPC_HIGH_IMPORTANCE].len,
+ l->backlog[TIPC_CRITICAL_IMPORTANCE].len,
+ l->backlog[TIPC_SYSTEM_IMPORTANCE].len);
+ i += tipc_list_dump(&l->backlogq, false, buf + i);
+ }
+ if (dqueues & TIPC_DUMP_DEFERDQ) {
+ i += scnprintf(buf + i, sz - i, "deferdq: ");
+ i += tipc_list_dump(&l->deferdq, false, buf + i);
+ }
+ if (dqueues & TIPC_DUMP_INPUTQ) {
+ i += scnprintf(buf + i, sz - i, "inputq: ");
+ i += tipc_list_dump(l->inputq, false, buf + i);
+ }
+ if (dqueues & TIPC_DUMP_WAKEUP) {
+ i += scnprintf(buf + i, sz - i, "wakeup: ");
+ i += tipc_list_dump(&l->wakeupq, false, buf + i);
+ }
+
+ return i;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.