[SCTP]: Extend /proc/net/sctp/snmp to provide more statistics.

This patch adds more statistics info under /proc/net/sctp/snmp
that should be useful for debugging. The additional events that
are counted now include timer expirations, retransmits, packet
and data chunk discards.

The Data chunk discards include all the cases where a data chunk
is discarded including high tsn, bad stream, dup tsn and the most
useful one(out of receive buffer/rwnd).

Also moved the SCTP MIB data structures from the generic include
directories to include/sctp/sctp.h.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 5b5ae7958322..32f57f42af9e 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2663,9 +2663,11 @@ sctp_disposition_t sctp_sf_eat_data_6_2(const struct sctp_endpoint *ep,
                 break;
         case SCTP_IERROR_HIGH_TSN:
         case SCTP_IERROR_BAD_STREAM:
+                SCTP_INC_STATS(SCTP_MIB_IN_DATA_CHUNK_DISCARDS);
                 goto discard_noforce;
         case SCTP_IERROR_DUP_TSN:
         case SCTP_IERROR_IGNORE_TSN:
+                SCTP_INC_STATS(SCTP_MIB_IN_DATA_CHUNK_DISCARDS);
                 goto discard_force;
         case SCTP_IERROR_NO_DATA:
                 goto consume;
@@ -3652,6 +3654,7 @@ sctp_disposition_t sctp_sf_pdiscard(const struct sctp_endpoint *ep,
                                     void *arg,
                                     sctp_cmd_seq_t *commands)
 {
+        SCTP_INC_STATS(SCTP_MIB_IN_PKT_DISCARDS);
         sctp_add_cmd_sf(commands, SCTP_CMD_DISCARD_PACKET, SCTP_NULL());
 
         return SCTP_DISPOSITION_CONSUME;
@@ -4548,6 +4551,8 @@ sctp_disposition_t sctp_sf_do_6_3_3_rtx(const struct sctp_endpoint *ep,
 {
         struct sctp_transport *transport = arg;
 
+        SCTP_INC_STATS(SCTP_MIB_T3_RTX_EXPIREDS);
+
         if (asoc->overall_error_count >= asoc->max_retrans) {
                 sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
                                 SCTP_ERROR(ETIMEDOUT));
@@ -4616,6 +4621,7 @@ sctp_disposition_t sctp_sf_do_6_2_sack(const struct sctp_endpoint *ep,
                                        void *arg,
                                        sctp_cmd_seq_t *commands)
 {
+        SCTP_INC_STATS(SCTP_MIB_DELAY_SACK_EXPIREDS);
         sctp_add_cmd_sf(commands, SCTP_CMD_GEN_SACK, SCTP_FORCE());
         return SCTP_DISPOSITION_CONSUME;
 }
@@ -4650,6 +4656,7 @@ sctp_disposition_t sctp_sf_t1_init_timer_expire(const struct sctp_endpoint *ep,
         int attempts = asoc->init_err_counter + 1;
 
         SCTP_DEBUG_PRINTK("Timer T1 expired (INIT).\n");
+        SCTP_INC_STATS(SCTP_MIB_T1_INIT_EXPIREDS);
 
         if (attempts <= asoc->max_init_attempts) {
                 bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
@@ -4709,6 +4716,7 @@ sctp_disposition_t sctp_sf_t1_cookie_timer_expire(const struct sctp_endpoint *ep
         int attempts = asoc->init_err_counter + 1;
 
         SCTP_DEBUG_PRINTK("Timer T1 expired (COOKIE-ECHO).\n");
+        SCTP_INC_STATS(SCTP_MIB_T1_COOKIE_EXPIREDS);
 
         if (attempts <= asoc->max_init_attempts) {
                 repl = sctp_make_cookie_echo(asoc, NULL);
@@ -4753,6 +4761,8 @@ sctp_disposition_t sctp_sf_t2_timer_expire(const struct sctp_endpoint *ep,
         struct sctp_chunk *reply = NULL;
 
         SCTP_DEBUG_PRINTK("Timer T2 expired.\n");
+        SCTP_INC_STATS(SCTP_MIB_T2_SHUTDOWN_EXPIREDS);
+
         if (asoc->overall_error_count >= asoc->max_retrans) {
                 sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR,
                                 SCTP_ERROR(ETIMEDOUT));
@@ -4814,6 +4824,8 @@ sctp_disposition_t sctp_sf_t4_timer_expire(
         struct sctp_chunk *chunk = asoc->addip_last_asconf;
         struct sctp_transport *transport = chunk->transport;
 
+        SCTP_INC_STATS(SCTP_MIB_T4_RTO_EXPIREDS);
+
         /* ADDIP 4.1 B1) Increment the error counters and perform path failure
          * detection on the appropriate destination address as defined in
          * RFC2960 [5] section 8.1 and 8.2.
@@ -4880,6 +4892,7 @@ sctp_disposition_t sctp_sf_t5_timer_expire(const struct sctp_endpoint *ep,
         struct sctp_chunk *reply = NULL;
 
         SCTP_DEBUG_PRINTK("Timer T5 expired.\n");
+        SCTP_INC_STATS(SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS);
 
         reply = sctp_make_abort(asoc, NULL, 0);
         if (!reply)
@@ -4910,6 +4923,8 @@ sctp_disposition_t sctp_sf_autoclose_timer_expire(
 {
         int disposition;
 
+        SCTP_INC_STATS(SCTP_MIB_AUTOCLOSE_EXPIREDS);
+
         /* From 9.2 Shutdown of an Association
          * Upon receipt of the SHUTDOWN primitive from its upper
          * layer, the endpoint enters SHUTDOWN-PENDING state and