Re: [PATCH net-next RFC v4 02/15] devlink: Add reload action limit level
From: Moshe Shemesh
Date: Tue Sep 15 2020 - 08:17:04 EST
On 9/14/2020 4:10 PM, Jiri Pirko wrote:
Mon, Sep 14, 2020 at 08:07:49AM CEST, moshe@xxxxxxxxxxxx wrote:
[..]
diff --git a/include/net/devlink.h b/include/net/devlink.h
index b09db891db04..dddd9ee5b8a9 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1012,9 +1012,13 @@ enum devlink_trap_group_generic_id {
struct devlink_ops {
unsigned long supported_reload_actions;
+ unsigned long supported_reload_action_limit_levels;
int (*reload_down)(struct devlink *devlink, bool netns_change,
- enum devlink_reload_action action, struct netlink_ext_ack *extack);
+ enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
+ struct netlink_ext_ack *extack);
int (*reload_up)(struct devlink *devlink, enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
struct netlink_ext_ack *extack, unsigned long *actions_performed);
int (*port_type_set)(struct devlink_port *devlink_port,
enum devlink_port_type port_type);
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index a6f64db0bdf3..b19686fd80ff 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -287,6 +287,22 @@ enum devlink_reload_action {
DEVLINK_RELOAD_ACTION_MAX = __DEVLINK_RELOAD_ACTION_MAX - 1
};
+/**
+ * enum devlink_reload_action_limit_level - Reload action limit level.
+ * @DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE: No constrains on action. Action may include
+ * reset or downtime as needed.
+ * @DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NO_RESET: No reset allowed, no down time allowed,
+ * no link flap and no configuration is lost.
+ */
+enum devlink_reload_action_limit_level {
+ DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE,
+ DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NO_RESET,
+
+ /* Add new reload actions limit level above */
+ __DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX,
+ DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX = __DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX - 1
+};
+
enum devlink_attr {
/* don't change the order or add anything between, this is ABI! */
DEVLINK_ATTR_UNSPEC,
@@ -478,6 +494,7 @@ enum devlink_attr {
DEVLINK_ATTR_RELOAD_ACTION, /* u8 */
DEVLINK_ATTR_RELOAD_ACTIONS_PERFORMED, /* nested */
+ DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL, /* u8 */
/* add new attributes above here, update the policy in devlink.c */
diff --git a/net/core/devlink.c b/net/core/devlink.c
index f4be1e1bf864..60aa0c4a3726 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -468,6 +468,13 @@ devlink_reload_action_is_supported(struct devlink *devlink, enum devlink_reload_
return test_bit(action, &devlink->ops->supported_reload_actions);
}
+static bool
+devlink_reload_action_limit_level_is_supported(struct devlink *devlink,
+ enum devlink_reload_action_limit_level limit_level)
+{
+ return test_bit(limit_level, &devlink->ops->supported_reload_action_limit_levels);
+}
+
static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink,
enum devlink_command cmd, u32 portid,
u32 seq, int flags)
@@ -2975,22 +2982,23 @@ bool devlink_is_reload_failed(const struct devlink *devlink)
EXPORT_SYMBOL_GPL(devlink_is_reload_failed);
static int devlink_reload(struct devlink *devlink, struct net *dest_net,
- enum devlink_reload_action action, struct netlink_ext_ack *extack,
- unsigned long *actions_performed)
+ enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
+ struct netlink_ext_ack *extack, unsigned long *actions_performed)
{
int err;
if (!devlink->reload_enabled)
return -EOPNOTSUPP;
- err = devlink->ops->reload_down(devlink, !!dest_net, action, extack);
+ err = devlink->ops->reload_down(devlink, !!dest_net, action, limit_level, extack);
if (err)
return err;
if (dest_net && !net_eq(dest_net, devlink_net(devlink)))
devlink_reload_netns_change(devlink, dest_net);
- err = devlink->ops->reload_up(devlink, action, extack, actions_performed);
+ err = devlink->ops->reload_up(devlink, action, limit_level, extack, actions_performed);
devlink_reload_failed_set(devlink, !!err);
return err;
}
@@ -3036,6 +3044,7 @@ devlink_nl_reload_actions_performed_fill(struct sk_buff *msg,
static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
{
+ enum devlink_reload_action_limit_level limit_level;
struct devlink *devlink = info->user_ptr[0];
enum devlink_reload_action action;
unsigned long actions_performed;
@@ -3073,7 +3082,20 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
return -EOPNOTSUPP;
}
- err = devlink_reload(devlink, dest_net, action, info->extack, &actions_performed);
+ if (info->attrs[DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL])
+ limit_level = nla_get_u8(info->attrs[DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL]);
+ else
+ limit_level = DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE;
+
+ if (limit_level > DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX) {
Again, not needed, devlink_reload_action_limit_level_is_supported() will
take case of it.
Ack.
+ NL_SET_ERR_MSG_MOD(info->extack, "Invalid limit level");
+ return -EINVAL;
+ } else if (!devlink_reload_action_limit_level_is_supported(devlink, limit_level)) {
+ NL_SET_ERR_MSG_MOD(info->extack, "Requested limit level is not supported");
"..by the driver"?
Ack.
+ return -EOPNOTSUPP;
+ }
+ err = devlink_reload(devlink, dest_net, action, limit_level, info->extack,
+ &actions_performed);
if (dest_net)
put_net(dest_net);
@@ -7126,6 +7148,7 @@ static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {
[DEVLINK_ATTR_TRAP_POLICER_BURST] = { .type = NLA_U64 },
[DEVLINK_ATTR_PORT_FUNCTION] = { .type = NLA_NESTED },
[DEVLINK_ATTR_RELOAD_ACTION] = { .type = NLA_U8 },
+ [DEVLINK_ATTR_RELOAD_ACTION_LIMIT_LEVEL] = { .type = NLA_U8 },
};
static const struct genl_ops devlink_nl_ops[] = {
@@ -7462,6 +7485,10 @@ static int devlink_reload_actions_verify(struct devlink *devlink)
if (WARN_ON(ops->supported_reload_actions >= BIT(__DEVLINK_RELOAD_ACTION_MAX) ||
ops->supported_reload_actions <= BIT(DEVLINK_RELOAD_ACTION_UNSPEC)))
return -EINVAL;
+ if (WARN_ON(!ops->supported_reload_action_limit_levels ||
+ ops->supported_reload_action_limit_levels >=
+ BIT(__DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX)))
+ return -EINVAL;
I think that you can check some insane driver combinations like:
supports only driver-reinit, supports LEVEL_NO_RESET - that is
impossible and should be refused here.
Same goes to the actual user command call. If the user calls for
driver-reinit with LEVEL_NO_RESET, devlink should refuse with proper
extack
I actually holds a counter for this combination too, we said no_reset
can apply to any action, but not really.
return 0;
}
@@ -9756,7 +9783,8 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
if (WARN_ON(!devlink_reload_supported(devlink)))
continue;
err = devlink_reload(devlink, &init_net,
- DEVLINK_RELOAD_ACTION_DRIVER_REINIT, NULL, NULL);
+ DEVLINK_RELOAD_ACTION_DRIVER_REINIT,
+ DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE, NULL, NULL);
if (err && err != -EOPNOTSUPP)
pr_warn("Failed to reload devlink instance into init_net\n");
}
--
2.17.1