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SubjectRe: [PATCH net-next RFC v5 02/15] devlink: Add reload action limit level
On Fri, 18 Sep 2020 19:06:38 +0300 Moshe Shemesh wrote:
> 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.
>
> Some combinations of action and limit level are invalid. For example,
> driver can not reinitialize its entities without any downtime.
>
> 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>
> ---
> v4 -> v5:
> - Remove check DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX
> - Added list of invalid action-limit_level combinations and add check to
> supported actions and levels and check user request
> 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 | 76 +++++++++++++++++--
> 7 files changed, 107 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 1a482120cc0a..f0ef295af477 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);
> @@ -3985,6 +3987,7 @@ 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),

Please cut down the name lenghts, this is just lazy.

'supported_reload_limits' or 'cap_reload_limits' is perfectly
sufficient.

'reload_limits' would be even better. Cause what else would it be if
not a capability.

Besides I don't think drivers should have to fill negative attributes
(that they don't support something). Everyone is always going to
support NONE, since it's "unspecified" / "pick your favorite", right?

> .reload_down = mlx4_devlink_reload_down,
> .reload_up = mlx4_devlink_reload_up,
> };

> diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
> index fdba7ab58a79..0c5d942dcbd5 100644
> --- a/include/uapi/linux/devlink.h
> +++ b/include/uapi/linux/devlink.h
> @@ -289,6 +289,22 @@ 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 {

You reserved UNSPEC for actions but not for 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,
> @@ -480,6 +496,7 @@ 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 318ef29f81f2..fee6fcc7dead 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -462,12 +462,45 @@ static int devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
> return 0;
> }
>
> +struct devlink_reload_combination {
> + enum devlink_reload_action action;
> + enum devlink_reload_action_limit_level limit_level;
> +};
> +
> +static const struct devlink_reload_combination devlink_reload_invalid_combinations[] = {
> + {
> + /* can't reinitialize driver with no down time */
> + .action = DEVLINK_RELOAD_ACTION_DRIVER_REINIT,
> + .limit_level = DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NO_RESET,
> + },
> +};
> +
> +static bool
> +devlink_reload_combination_is_invalid(enum devlink_reload_action action,
> + enum devlink_reload_action_limit_level limit_level)
> +{
> + int i;
> +
> + for (i = 0 ; i < ARRAY_SIZE(devlink_reload_invalid_combinations) ; i++)

Whitespace. Did you checkpatch?

> + if (devlink_reload_invalid_combinations[i].action == action &&
> + devlink_reload_invalid_combinations[i].limit_level == limit_level)
> + return true;
> + return false;
> +}
> +
> static bool
> devlink_reload_action_is_supported(struct devlink *devlink, enum devlink_reload_action action)
> {
> 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);
> +}

This single-use helper just grows LoC and muddies the code IMHO.

> static int devlink_nl_fill(struct sk_buff *msg, struct devlink *devlink,
> enum devlink_command cmd, u32 portid,
> u32 seq, int flags)
> @@ -2975,22 +3008,23 @@ 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);
> if (err)
> return err;
> @@ -3040,6 +3074,7 @@ 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;
> @@ -3077,7 +3112,21 @@ 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 (!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");
> + return -EOPNOTSUPP;
> + }
> + if (devlink_reload_combination_is_invalid(action, limit_level)) {
> + NL_SET_ERR_MSG_MOD(info->extack, "Requested limit level is invalid for this action");
> + return -EINVAL;
> + }
> + err = devlink_reload(devlink, dest_net, action, limit_level, info->extack,
> + &actions_performed);
>
> if (dest_net)
> put_net(dest_net);
> @@ -7154,6 +7203,7 @@ 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 },

range

> };
>
> static const struct genl_ops devlink_nl_ops[] = {
> @@ -7489,6 +7539,9 @@ static struct genl_family devlink_nl_family __ro_after_init = {
>
> static bool devlink_reload_actions_valid(const struct devlink_ops *ops)
> {
> + const struct devlink_reload_combination *comb;
> + int i;
> +
> if (!devlink_reload_supported(ops)) {
> if (WARN_ON(ops->supported_reload_actions))
> return false;
> @@ -7498,6 +7551,18 @@ static bool devlink_reload_actions_valid(const struct devlink_ops *ops)
> if (WARN_ON(ops->supported_reload_actions >= BIT(__DEVLINK_RELOAD_ACTION_MAX) ||
> ops->supported_reload_actions <= BIT(DEVLINK_RELOAD_ACTION_UNSPEC)))
> return false;
> +
> + if (WARN_ON(!ops->supported_reload_action_limit_levels ||
> + ops->supported_reload_action_limit_levels >=
> + BIT(__DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_MAX)))
> + return false;
> +
> + for (i = 0; i < ARRAY_SIZE(devlink_reload_invalid_combinations); i++) {

White space, again.

> + comb = &devlink_reload_invalid_combinations[i];
> + if (ops->supported_reload_actions == BIT(comb->action) &&
> + ops->supported_reload_action_limit_levels == BIT(comb->limit_level))
> + return false;
> + }
> return true;
> }
>
> @@ -9793,6 +9858,7 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
> continue;
> err = devlink_reload(devlink, &init_net,
> DEVLINK_RELOAD_ACTION_DRIVER_REINIT,
> + DEVLINK_RELOAD_ACTION_LIMIT_LEVEL_NONE,
> NULL, &actions_performed);
> if (err && err != -EOPNOTSUPP)
> pr_warn("Failed to reload devlink instance into init_net\n");

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