NFSv4.1: Add tracepoints for debugging slot table operations

Add tracepoints to nfs41_setup_sequence and nfs41_sequence_done
to track session and slot table state changes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

5 files changed, 154 insertions, 0 deletions

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index c0749305189b..b25ed7e3e937 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -464,6 +464,7 @@ out:
         } else
                 res->csr_status = status;
 
+        trace_nfs4_cb_sequence(args, res, status);
         dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
                 ntohl(status), ntohl(res->csr_status));
         return status;
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c8b5ff6effe9..a745f7c41758 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -508,6 +508,7 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
                 interrupted = true;
         }
 
+        trace_nfs4_sequence_done(session, res);
         /* Check the SEQUENCE operation status */
         switch (res->sr_status) {
         case 0:
@@ -660,6 +661,7 @@ int nfs41_setup_sequence(struct nfs4_session *session,
          * set to 1 if an rpc level failure occurs.
          */
         res->sr_status = 1;
+        trace_nfs4_setup_sequence(session, args);
 out_success:
         rpc_call_start(task);
         return 0;
diff --git a/fs/nfs/nfs4session.h b/fs/nfs/nfs4session.h
index 86a066926f24..e3e6ce357f69 100644
--- a/fs/nfs/nfs4session.h
+++ b/fs/nfs/nfs4session.h
@@ -117,6 +117,16 @@ static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
         return 0;
 }
 
+#ifdef CONFIG_CRC32
+/*
+ * nfs_session_id_hash - calculate the crc32 hash for the session id
+ * @session - pointer to session
+ */
+#define nfs_session_id_hash(sess_id) \
+        (~crc32_le(0xFFFFFFFF, &(sess_id)->data[0], sizeof((sess_id)->data)))
+#else
+#define nfs_session_id_hash(session) (0)
+#endif
 #else /* defined(CONFIG_NFS_V4_1) */
 
 static inline int nfs4_init_session(struct nfs_client *clp)
diff --git a/fs/nfs/nfs4trace.c b/fs/nfs/nfs4trace.c
index f8409743c5c5..d774335cc8bc 100644
--- a/fs/nfs/nfs4trace.c
+++ b/fs/nfs/nfs4trace.c
@@ -4,6 +4,8 @@
 #include <linux/nfs_fs.h>
 #include "nfs4_fs.h"
 #include "internal.h"
+#include "nfs4session.h"
+#include "callback.h"
 
 #define CREATE_TRACE_POINTS
 #include "nfs4trace.h"
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index b2a2d8a30c66..05b96a6dac5c 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -240,6 +240,145 @@ DEFINE_NFS4_CLIENTID_EVENT(nfs4_destroy_clientid);
 DEFINE_NFS4_CLIENTID_EVENT(nfs4_bind_conn_to_session);
 DEFINE_NFS4_CLIENTID_EVENT(nfs4_sequence);
 DEFINE_NFS4_CLIENTID_EVENT(nfs4_reclaim_complete);
+
+TRACE_EVENT(nfs4_setup_sequence,
+                TP_PROTO(
+                        const struct nfs4_session *session,
+                        const struct nfs4_sequence_args *args
+                ),
+                TP_ARGS(session, args),
+
+                TP_STRUCT__entry(
+                        __field(unsigned int, session)
+                        __field(unsigned int, slot_nr)
+                        __field(unsigned int, seq_nr)
+                        __field(unsigned int, highest_used_slotid)
+                ),
+
+                TP_fast_assign(
+                        const struct nfs4_slot *sa_slot = args->sa_slot;
+                        __entry->session = nfs_session_id_hash(&session->sess_id);
+                        __entry->slot_nr = sa_slot->slot_nr;
+                        __entry->seq_nr = sa_slot->seq_nr;
+                        __entry->highest_used_slotid =
+                                        sa_slot->table->highest_used_slotid;
+                ),
+                TP_printk(
+                        "session=0x%08x slot_nr=%u seq_nr=%u "
+                        "highest_used_slotid=%u",
+                        __entry->session,
+                        __entry->slot_nr,
+                        __entry->seq_nr,
+                        __entry->highest_used_slotid
+                )
+);
+
+#define show_nfs4_sequence_status_flags(status) \
+        __print_flags((unsigned long)status, "|", \
+                { SEQ4_STATUS_CB_PATH_DOWN, "CB_PATH_DOWN" }, \
+                { SEQ4_STATUS_CB_GSS_CONTEXTS_EXPIRING, \
+                        "CB_GSS_CONTEXTS_EXPIRING" }, \
+                { SEQ4_STATUS_CB_GSS_CONTEXTS_EXPIRED, \
+                        "CB_GSS_CONTEXTS_EXPIRED" }, \
+                { SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED, \
+                        "EXPIRED_ALL_STATE_REVOKED" }, \
+                { SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED, \
+                        "EXPIRED_SOME_STATE_REVOKED" }, \
+                { SEQ4_STATUS_ADMIN_STATE_REVOKED, \
+                        "ADMIN_STATE_REVOKED" }, \
+                { SEQ4_STATUS_RECALLABLE_STATE_REVOKED,  \
+                        "RECALLABLE_STATE_REVOKED" }, \
+                { SEQ4_STATUS_LEASE_MOVED, "LEASE_MOVED" }, \
+                { SEQ4_STATUS_RESTART_RECLAIM_NEEDED, \
+                        "RESTART_RECLAIM_NEEDED" }, \
+                { SEQ4_STATUS_CB_PATH_DOWN_SESSION, \
+                        "CB_PATH_DOWN_SESSION" }, \
+                { SEQ4_STATUS_BACKCHANNEL_FAULT, \
+                        "BACKCHANNEL_FAULT" })
+
+TRACE_EVENT(nfs4_sequence_done,
+                TP_PROTO(
+                        const struct nfs4_session *session,
+                        const struct nfs4_sequence_res *res
+                ),
+                TP_ARGS(session, res),
+
+                TP_STRUCT__entry(
+                        __field(unsigned int, session)
+                        __field(unsigned int, slot_nr)
+                        __field(unsigned int, seq_nr)
+                        __field(unsigned int, highest_slotid)
+                        __field(unsigned int, target_highest_slotid)
+                        __field(unsigned int, status_flags)
+                        __field(int, error)
+                ),
+
+                TP_fast_assign(
+                        const struct nfs4_slot *sr_slot = res->sr_slot;
+                        __entry->session = nfs_session_id_hash(&session->sess_id);
+                        __entry->slot_nr = sr_slot->slot_nr;
+                        __entry->seq_nr = sr_slot->seq_nr;
+                        __entry->highest_slotid = res->sr_highest_slotid;
+                        __entry->target_highest_slotid =
+                                        res->sr_target_highest_slotid;
+                        __entry->error = res->sr_status;
+                ),
+                TP_printk(
+                        "error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
+                        "highest_slotid=%u target_highest_slotid=%u "
+                        "status_flags=%u (%s)",
+                        __entry->error,
+                        show_nfsv4_errors(__entry->error),
+                        __entry->session,
+                        __entry->slot_nr,
+                        __entry->seq_nr,
+                        __entry->highest_slotid,
+                        __entry->target_highest_slotid,
+                        __entry->status_flags,
+                        show_nfs4_sequence_status_flags(__entry->status_flags)
+                )
+);
+
+struct cb_sequenceargs;
+struct cb_sequenceres;
+
+TRACE_EVENT(nfs4_cb_sequence,
+                TP_PROTO(
+                        const struct cb_sequenceargs *args,
+                        const struct cb_sequenceres *res,
+                        __be32 status
+                ),
+                TP_ARGS(args, res, status),
+
+                TP_STRUCT__entry(
+                        __field(unsigned int, session)
+                        __field(unsigned int, slot_nr)
+                        __field(unsigned int, seq_nr)
+                        __field(unsigned int, highest_slotid)
+                        __field(unsigned int, cachethis)
+                        __field(int, error)
+                ),
+
+                TP_fast_assign(
+                        __entry->session = nfs_session_id_hash(&args->csa_sessionid);
+                        __entry->slot_nr = args->csa_slotid;
+                        __entry->seq_nr = args->csa_sequenceid;
+                        __entry->highest_slotid = args->csa_highestslotid;
+                        __entry->cachethis = args->csa_cachethis;
+                        __entry->error = -be32_to_cpu(status);
+                ),
+
+                TP_printk(
+                        "error=%d (%s) session=0x%08x slot_nr=%u seq_nr=%u "
+                        "highest_slotid=%u",
+                        __entry->error,
+                        show_nfsv4_errors(__entry->error),
+                        __entry->session,
+                        __entry->slot_nr,
+                        __entry->seq_nr,
+                        __entry->highest_slotid
+                )
+);
 #endif /* CONFIG_NFS_V4_1 */
 
 DECLARE_EVENT_CLASS(nfs4_open_event,