IB/hfi1: Fix a wrapping test to insure the correct timeout

The "2 * UINT_MAX"  statement:
	if ((u64)(ts - cce->timestamp) > 2 * UINT_MAX) {

is equivalent to:
	if ((u64)(ts - cce->timestamp) > UINT_MAX - 1) {

This results in a premature timeout of the cong log entry.

Fix by using unsigned 64 bit integers, removing casts, and using
an algebraic equivalent test to avoid the "2 * UINT_MAX" issue.

Also make use of kernel API to get nanoseconds instead of
open coding.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c
index e648f58..0a867e5 100644 (file)
--- a/drivers/infiniband/hw/hfi1/mad.c
+++ b/drivers/infiniband/hw/hfi1/mad.c
@@ -3760,7 +3760,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am,
        struct hfi1_ibport *ibp = to_iport(ibdev, port);
        struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
        struct opa_hfi1_cong_log *cong_log = (struct opa_hfi1_cong_log *)data;
-       s64 ts;
+       u64 ts;
        int i;
 
        if (am || smp_length_check(sizeof(*cong_log), max_len)) {
@@ -3778,7 +3778,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am,
               ppd->threshold_cong_event_map,
               sizeof(cong_log->threshold_cong_event_map));
        /* keep timestamp in units of 1.024 usec */
-       ts = ktime_to_ns(ktime_get()) / 1024;
+       ts = ktime_get_ns() / 1024;
        cong_log->current_time_stamp = cpu_to_be32(ts);
        for (i = 0; i < OPA_CONG_LOG_ELEMS; i++) {
                struct opa_hfi1_cong_log_event_internal *cce =
@@ -3790,7 +3790,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am,
                 * required to wrap the counter are supposed to
                 * be zeroed (CA10-49 IBTA, release 1.2.1, V1).
                 */
-               if ((u64)(ts - cce->timestamp) > (2 * UINT_MAX))
+               if ((ts - cce->timestamp) / 2 > U32_MAX)
                        continue;
                memcpy(cong_log->events[i].local_qp_cn_entry, &cce->lqpn, 3);
                memcpy(cong_log->events[i].remote_qp_number_cn_entry,

diff --git a/drivers/infiniband/hw/hfi1/mad.h b/drivers/infiniband/hw/hfi1/mad.h
index a4f8ac1..c4938f3 100644 (file)
--- a/drivers/infiniband/hw/hfi1/mad.h
+++ b/drivers/infiniband/hw/hfi1/mad.h
@@ -239,7 +239,7 @@ struct opa_hfi1_cong_log_event_internal {
        u8 sl;
        u8 svc_type;
        u32 rlid;
-       s64 timestamp; /* wider than 32 bits to detect 32 bit rollover */
+       u64 timestamp; /* wider than 32 bits to detect 32 bit rollover */
 };
 
 struct opa_hfi1_cong_log_event {

diff --git a/drivers/infiniband/hw/hfi1/rc.c b/drivers/infiniband/hw/hfi1/rc.c
index 32d7bbe..3f21b05 100644 (file)
--- a/drivers/infiniband/hw/hfi1/rc.c
+++ b/drivers/infiniband/hw/hfi1/rc.c
@@ -1965,7 +1965,7 @@ static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid,
        cc_event->svc_type = svc_type;
        cc_event->rlid = rlid;
        /* keep timestamp in units of 1.024 usec */
-       cc_event->timestamp = ktime_to_ns(ktime_get()) / 1024;
+       cc_event->timestamp = ktime_get_ns() / 1024;
 
        spin_unlock_irqrestore(&ppd->cc_log_lock, flags);
 }