devlink: Add auto dump flag to health reporter

On low memory system, run time dumps can consume too much memory. Add
administrator ability to disable auto dumps per reporter as part of the
error flow handle routine.

This attribute is not relevant while executing
DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET.

By default, auto dump is activated for any reporter that has a dump method,
as part of the reporter registration to devlink.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index dfdffc42e87d46ff27ed445dcec9f5451e375c7d..e7891d1d2ebd943f1ee78aca4444c952c8ef143f 100644 (file)
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -429,6 +429,8 @@ enum devlink_attr {
        DEVLINK_ATTR_NETNS_FD,                  /* u32 */
        DEVLINK_ATTR_NETNS_PID,                 /* u32 */
        DEVLINK_ATTR_NETNS_ID,                  /* u32 */
+
+       DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP, /* u8 */
        /* 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 963d0daea10a7ee914bc72b4902db707bf761611..85c7887356f6ef41b62fc224f2fa05af7e2a59f1 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -5089,6 +5089,7 @@ struct devlink_health_reporter {
        struct mutex dump_lock; /* lock parallel read/write from dump buffers */
        u64 graceful_period;
        bool auto_recover;
+       bool auto_dump;
        u8 health_state;
        u64 dump_ts;
        u64 dump_real_ts;
@@ -5155,6 +5156,7 @@ devlink_health_reporter_create(struct devlink *devlink,
        reporter->devlink = devlink;
        reporter->graceful_period = graceful_period;
        reporter->auto_recover = !!ops->recover;
+       reporter->auto_dump = !!ops->dump;
        mutex_init(&reporter->dump_lock);
        refcount_set(&reporter->refcount, 1);
        list_add_tail(&reporter->list, &devlink->reporter_list);
@@ -5235,6 +5237,10 @@ devlink_nl_health_reporter_fill(struct sk_buff *msg,
            nla_put_u64_64bit(msg, DEVLINK_ATTR_HEALTH_REPORTER_DUMP_TS_NS,
                              reporter->dump_real_ts, DEVLINK_ATTR_PAD))
                goto reporter_nest_cancel;
+       if (reporter->ops->dump &&
+           nla_put_u8(msg, DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP,
+                      reporter->auto_dump))
+               goto reporter_nest_cancel;
 
        nla_nest_end(msg, reporter_attr);
        genlmsg_end(msg, hdr);
@@ -5381,10 +5387,12 @@ int devlink_health_report(struct devlink_health_reporter *reporter,
 
        reporter->health_state = DEVLINK_HEALTH_REPORTER_STATE_ERROR;
 
-       mutex_lock(&reporter->dump_lock);
-       /* store current dump of current error, for later analysis */
-       devlink_health_do_dump(reporter, priv_ctx, NULL);
-       mutex_unlock(&reporter->dump_lock);
+       if (reporter->auto_dump) {
+               mutex_lock(&reporter->dump_lock);
+               /* store current dump of current error, for later analysis */
+               devlink_health_do_dump(reporter, priv_ctx, NULL);
+               mutex_unlock(&reporter->dump_lock);
+       }
 
        if (reporter->auto_recover)
                return devlink_health_reporter_recover(reporter,
@@ -5558,6 +5566,11 @@ devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
                err = -EOPNOTSUPP;
                goto out;
        }
+       if (!reporter->ops->dump &&
+           info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP]) {
+               err = -EOPNOTSUPP;
+               goto out;
+       }
 
        if (info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD])
                reporter->graceful_period =
@@ -5567,6 +5580,10 @@ devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
                reporter->auto_recover =
                        nla_get_u8(info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER]);
 
+       if (info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP])
+               reporter->auto_dump =
+               nla_get_u8(info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP]);
+
        devlink_health_reporter_put(reporter);
        return 0;
 out:
@@ -6313,6 +6330,7 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
        [DEVLINK_ATTR_NETNS_PID] = { .type = NLA_U32 },
        [DEVLINK_ATTR_NETNS_FD] = { .type = NLA_U32 },
        [DEVLINK_ATTR_NETNS_ID] = { .type = NLA_U32 },
+       [DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP] = { .type = NLA_U8 },
 };
 
 static const struct genl_ops devlink_nl_ops[] = {