[PATCH net-next RFC v4 02/15] devlink: Add reload action limit level

Moshe Shemesh
2020-09-14T06:09:07Z

Add reload action limit level to demand restrictions on actions.
Reload action limit levels supported:
none (default): No constrains on actions. Driver implementation may
include reset or downtime as needed to perform the
actions.
no_reset: No reset allowed, no down time allowed, no link flap and no
configuration is lost.

The no_reset limit level will have usecase in this patchset to
implement restricted fw_activate on mlx5.

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
---
v3 -> v4:
- New patch
---
drivers/net/ethernet/mellanox/mlx4/main.c | 3 ++
.../net/ethernet/mellanox/mlx5/core/devlink.c | 3 ++
drivers/net/ethernet/mellanox/mlxsw/core.c | 3 ++
drivers/net/netdevsim/dev.c | 6 ++-
include/net/devlink.h | 6 ++-
include/uapi/linux/devlink.h | 17 ++++++++
net/core/devlink.c | 40 ++++++++++++++++---
7 files changed, 70 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index aadf1676a0ed..681b4507b2ba 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -3947,6 +3947,7 @@ static int mlx4_restart_one_up(struct pci_dev *pdev, bool reload,

static int mlx4_devlink_reload_down(struct devlink *devlink, bool netns_change,
enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
struct netlink_ext_ack *extack)
{
struct mlx4_priv *priv = devlink_priv(devlink);
@@ -3964,6 +3965,7 @@ static int mlx4_devlink_reload_down(struct devlink *devlink, bool netns_change,
}

static int mlx4_devlink_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)
{
struct mlx4_priv *priv = devlink_priv(devlink);
@@ -3986,6 +3988,7 @@ static int mlx4_devlink_reload_up(struct devlink *devlink, enum devlink_reload_a
static const struct devlink_ops mlx4_devlink_ops = {
.port_type_set = mlx4_devlink_port_type_set,
.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+ .supported_reload_action_limit_levels = BIT(DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE),
.reload_down = mlx4_devlink_reload_down,
.reload_up = mlx4_devlink_reload_up,
};
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index 9cd6b6c884e3..f6b29deaf02e 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -90,6 +90,7 @@ mlx5_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,

static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
struct netlink_ext_ack *extack)
{
struct mlx5_core_dev *dev = devlink_priv(devlink);
@@ -99,6 +100,7 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
}

static int mlx5_devlink_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)
{
struct mlx5_core_dev *dev = devlink_priv(devlink);
@@ -127,6 +129,7 @@ static const struct devlink_ops mlx5_devlink_ops = {
.flash_update = mlx5_devlink_flash_update,
.info_get = mlx5_devlink_info_get,
.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+ .supported_reload_action_limit_levels = BIT(DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE),
.reload_down = mlx5_devlink_reload_down,
.reload_up = mlx5_devlink_reload_up,
};
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index c0a32f685b85..e2b21e5878f3 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -1114,6 +1114,7 @@ mlxsw_devlink_info_get(struct devlink *devlink, struct devlink_info_req *req,
static int
mlxsw_devlink_core_bus_device_reload_down(struct devlink *devlink,
bool netns_change, enum devlink_reload_action action,
+ enum devlink_reload_action_limit_level limit_level,
struct netlink_ext_ack *extack)
{
struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
@@ -1127,6 +1128,7 @@ mlxsw_devlink_core_bus_device_reload_down(struct devlink *devlink,

static int
mlxsw_devlink_core_bus_device_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)
{
@@ -1279,6 +1281,7 @@ mlxsw_devlink_trap_policer_counter_get(struct devlink *devlink,
static const struct devlink_ops mlxsw_devlink_ops = {
.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
+ .supported_reload_action_limit_levels = BIT(DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE),
.reload_down = mlxsw_devlink_core_bus_device_reload_down,
.reload_up = mlxsw_devlink_core_bus_device_reload_up,
.port_type_set = mlxsw_devlink_port_type_set,
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index f0919fa0cd8b..12fbaf56f722 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -697,7 +697,9 @@ static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev);

static int nsim_dev_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)
{
struct nsim_dev *nsim_dev = devlink_priv(devlink);

@@ -714,6 +716,7 @@ static int nsim_dev_reload_down(struct devlink *devlink, bool netns_change,
}

static int nsim_dev_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)
{
struct nsim_dev *nsim_dev = devlink_priv(devlink);
@@ -883,6 +886,7 @@ nsim_dev_devlink_trap_policer_counter_get(struct devlink *devlink,

static const struct devlink_ops nsim_dev_devlink_ops = {
.supported_reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT),
+ .supported_reload_action_limit_levels = BIT(DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE),
.reload_down = nsim_dev_reload_down,
.reload_up = nsim_dev_reload_up,
.info_get = nsim_dev_info_get,
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) {
+ 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");
+ 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;
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