[net] devlink: Add method for time-stamp on reporter's dump

[Aya Levin]

When setting the dump's time-stamp, use ktime_get_real in addition to
jiffies. This simplifies the user space implementation and bypasses
some inconsistent behavior with translating jiffies to current time.

Fixes: c8e1da0bf923 ("devlink: Add health report functionality")
Signed-off-by: Aya Levin <a...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
---
 include/uapi/linux/devlink.h | 2 ++
 net/core/devlink.c           | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index ffc993256527..4dd4e4e7b19b 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -348,6 +348,8 @@ enum devlink_attr {
        DEVLINK_ATTR_PORT_PCI_PF_NUMBER,        /* u16 */
        DEVLINK_ATTR_PORT_PCI_VF_NUMBER,        /* u16 */
 
+       DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TSPEC,
+
        /* add new attributes above here, update the policy in devlink.c */
 
        __DEVLINK_ATTR_MAX,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index d3dbb904bf3b..b26875c4329b 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4577,6 +4577,7 @@ struct devlink_health_reporter {
        bool auto_recover;
        u8 health_state;
        u64 dump_ts;
+       struct timespec dump_real_ts;
        u64 error_count;
        u64 recovery_count;
        u64 last_recovery_ts;
@@ -4749,6 +4750,7 @@ static int devlink_health_do_dump(struct 
devlink_health_reporter *reporter,
                goto dump_err;
 
        reporter->dump_ts = jiffies;
+       reporter->dump_real_ts = ktime_to_timespec(ktime_get_real());
 
        return 0;
 
@@ -4911,6 +4913,10 @@ devlink_nl_health_reporter_fill(struct sk_buff *msg,
                              jiffies_to_msecs(reporter->dump_ts),
                              DEVLINK_ATTR_PAD))
                goto reporter_nest_cancel;
+       if (reporter->dump_fmsg &&
+           nla_put(msg, DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TSPEC,
+                   sizeof(reporter->dump_real_ts), &reporter->dump_real_ts))
+               goto reporter_nest_cancel;
 
        nla_nest_end(msg, reporter_attr);
        genlmsg_end(msg, hdr);
-- 
2.14.1