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Date: Fri, 30 Mar 2018 08:45:50 -0600
From: David Ahern <dsahern@...il.com>
To: Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, jiri@...lanox.com, petrm@...lanox.com,
mlxsw@...lanox.com
Subject: Re: [PATCH net-next 09/11] devlink: convert occ_get op to separate
registration
On 3/29/18 2:33 PM, Ido Schimmel wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> This resolves race during initialization where the resources with
> ops are registered before driver and the structures used by occ_get
> op is initialized. So keep occ_get callbacks registered only when
> all structs are initialized.
Why can't the occ_get handler look at some flag in an mlxsw struct to
know if the system has initialized?
Separate registration here is awkward. You register a resource and then
register its op later.
Also, this should be a standalone patch rather than embedded in a
'mlxsw: Various cleanups' set.
>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> ---
> drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 24 ++-----
> drivers/net/ethernet/mellanox/mlxsw/spectrum.h | 1 -
> .../net/ethernet/mellanox/mlxsw/spectrum_kvdl.c | 67 ++++++++++++--------
> include/net/devlink.h | 40 ++++++++----
> net/core/devlink.c | 74 +++++++++++++++++++---
> 5 files changed, 134 insertions(+), 72 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
> index b831af38e0a1..0d95d2cb73e3 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
> @@ -3805,18 +3805,6 @@ static const struct mlxsw_config_profile mlxsw_sp_config_profile = {
> },
> };
>
> -static u64 mlxsw_sp_resource_kvd_linear_occ_get(struct devlink *devlink)
> -{
> - struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> - struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
> -
> - return mlxsw_sp_kvdl_occ_get(mlxsw_sp);
> -}
> -
> -static const struct devlink_resource_ops mlxsw_sp_resource_kvd_linear_ops = {
> - .occ_get = mlxsw_sp_resource_kvd_linear_occ_get,
> -};
> -
> static void
> mlxsw_sp_resource_size_params_prepare(struct mlxsw_core *mlxsw_core,
> struct devlink_resource_size_params *kvd_size_params,
> @@ -3877,8 +3865,7 @@ static int mlxsw_sp_resources_register(struct mlxsw_core *mlxsw_core)
> err = devlink_resource_register(devlink, MLXSW_SP_RESOURCE_NAME_KVD,
> kvd_size, MLXSW_SP_RESOURCE_KVD,
> DEVLINK_RESOURCE_ID_PARENT_TOP,
> - &kvd_size_params,
> - NULL);
> + &kvd_size_params);
> if (err)
> return err;
>
> @@ -3887,8 +3874,7 @@ static int mlxsw_sp_resources_register(struct mlxsw_core *mlxsw_core)
> linear_size,
> MLXSW_SP_RESOURCE_KVD_LINEAR,
> MLXSW_SP_RESOURCE_KVD,
> - &linear_size_params,
> - &mlxsw_sp_resource_kvd_linear_ops);
> + &linear_size_params);
> if (err)
> return err;
>
> @@ -3905,8 +3891,7 @@ static int mlxsw_sp_resources_register(struct mlxsw_core *mlxsw_core)
> double_size,
> MLXSW_SP_RESOURCE_KVD_HASH_DOUBLE,
> MLXSW_SP_RESOURCE_KVD,
> - &hash_double_size_params,
> - NULL);
> + &hash_double_size_params);
> if (err)
> return err;
>
> @@ -3915,8 +3900,7 @@ static int mlxsw_sp_resources_register(struct mlxsw_core *mlxsw_core)
> single_size,
> MLXSW_SP_RESOURCE_KVD_HASH_SINGLE,
> MLXSW_SP_RESOURCE_KVD,
> - &hash_single_size_params,
> - NULL);
> + &hash_single_size_params);
> if (err)
> return err;
>
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
> index 21bee8f19894..c59a0d7d81d5 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
> @@ -442,7 +442,6 @@ void mlxsw_sp_kvdl_free(struct mlxsw_sp *mlxsw_sp, int entry_index);
> int mlxsw_sp_kvdl_alloc_size_query(struct mlxsw_sp *mlxsw_sp,
> unsigned int entry_count,
> unsigned int *p_alloc_size);
> -u64 mlxsw_sp_kvdl_occ_get(const struct mlxsw_sp *mlxsw_sp);
> int mlxsw_sp_kvdl_resources_register(struct devlink *devlink);
>
> struct mlxsw_sp_acl_rule_info {
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
> index 7b28f65d6407..1b7280168e6b 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
> @@ -315,8 +315,9 @@ static u64 mlxsw_sp_kvdl_part_occ(struct mlxsw_sp_kvdl_part *part)
> return occ;
> }
>
> -u64 mlxsw_sp_kvdl_occ_get(const struct mlxsw_sp *mlxsw_sp)
> +static u64 mlxsw_sp_kvdl_occ_get(void *priv)
> {
> + const struct mlxsw_sp *mlxsw_sp = priv;
> u64 occ = 0;
> int i;
>
> @@ -326,48 +327,33 @@ u64 mlxsw_sp_kvdl_occ_get(const struct mlxsw_sp *mlxsw_sp)
> return occ;
> }
>
> -static u64 mlxsw_sp_kvdl_single_occ_get(struct devlink *devlink)
> +static u64 mlxsw_sp_kvdl_single_occ_get(void *priv)
> {
> - struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> - struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
> + const struct mlxsw_sp *mlxsw_sp = priv;
> struct mlxsw_sp_kvdl_part *part;
>
> part = mlxsw_sp->kvdl->parts[MLXSW_SP_KVDL_PART_ID_SINGLE];
> return mlxsw_sp_kvdl_part_occ(part);
> }
>
> -static u64 mlxsw_sp_kvdl_chunks_occ_get(struct devlink *devlink)
> +static u64 mlxsw_sp_kvdl_chunks_occ_get(void *priv)
> {
> - struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> - struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
> + const struct mlxsw_sp *mlxsw_sp = priv;
> struct mlxsw_sp_kvdl_part *part;
>
> part = mlxsw_sp->kvdl->parts[MLXSW_SP_KVDL_PART_ID_CHUNKS];
> return mlxsw_sp_kvdl_part_occ(part);
> }
>
> -static u64 mlxsw_sp_kvdl_large_chunks_occ_get(struct devlink *devlink)
> +static u64 mlxsw_sp_kvdl_large_chunks_occ_get(void *priv)
> {
> - struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> - struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
> + const struct mlxsw_sp *mlxsw_sp = priv;
> struct mlxsw_sp_kvdl_part *part;
>
> part = mlxsw_sp->kvdl->parts[MLXSW_SP_KVDL_PART_ID_LARGE_CHUNKS];
> return mlxsw_sp_kvdl_part_occ(part);
> }
>
> -static const struct devlink_resource_ops mlxsw_sp_kvdl_single_ops = {
> - .occ_get = mlxsw_sp_kvdl_single_occ_get,
> -};
> -
> -static const struct devlink_resource_ops mlxsw_sp_kvdl_chunks_ops = {
> - .occ_get = mlxsw_sp_kvdl_chunks_occ_get,
> -};
> -
> -static const struct devlink_resource_ops mlxsw_sp_kvdl_chunks_large_ops = {
> - .occ_get = mlxsw_sp_kvdl_large_chunks_occ_get,
> -};
> -
> int mlxsw_sp_kvdl_resources_register(struct devlink *devlink)
> {
> struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
> @@ -386,8 +372,7 @@ int mlxsw_sp_kvdl_resources_register(struct devlink *devlink)
> MLXSW_SP_KVDL_SINGLE_SIZE,
> MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE,
> MLXSW_SP_RESOURCE_KVD_LINEAR,
> - &size_params,
> - &mlxsw_sp_kvdl_single_ops);
> + &size_params);
> if (err)
> return err;
>
> @@ -398,8 +383,7 @@ int mlxsw_sp_kvdl_resources_register(struct devlink *devlink)
> MLXSW_SP_KVDL_CHUNKS_SIZE,
> MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS,
> MLXSW_SP_RESOURCE_KVD_LINEAR,
> - &size_params,
> - &mlxsw_sp_kvdl_chunks_ops);
> + &size_params);
> if (err)
> return err;
>
> @@ -410,13 +394,13 @@ int mlxsw_sp_kvdl_resources_register(struct devlink *devlink)
> MLXSW_SP_KVDL_LARGE_CHUNKS_SIZE,
> MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS,
> MLXSW_SP_RESOURCE_KVD_LINEAR,
> - &size_params,
> - &mlxsw_sp_kvdl_chunks_large_ops);
> + &size_params);
> return err;
> }
>
> int mlxsw_sp_kvdl_init(struct mlxsw_sp *mlxsw_sp)
> {
> + struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
> struct mlxsw_sp_kvdl *kvdl;
> int err;
>
> @@ -429,6 +413,23 @@ int mlxsw_sp_kvdl_init(struct mlxsw_sp *mlxsw_sp)
> if (err)
> goto err_kvdl_parts_init;
>
> + devlink_resource_occ_get_register(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR,
> + mlxsw_sp_kvdl_occ_get,
> + mlxsw_sp);
> + devlink_resource_occ_get_register(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE,
> + mlxsw_sp_kvdl_single_occ_get,
> + mlxsw_sp);
> + devlink_resource_occ_get_register(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS,
> + mlxsw_sp_kvdl_chunks_occ_get,
> + mlxsw_sp);
> + devlink_resource_occ_get_register(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS,
> + mlxsw_sp_kvdl_large_chunks_occ_get,
> + mlxsw_sp);
> +
> return 0;
>
> err_kvdl_parts_init:
> @@ -438,6 +439,16 @@ int mlxsw_sp_kvdl_init(struct mlxsw_sp *mlxsw_sp)
>
> void mlxsw_sp_kvdl_fini(struct mlxsw_sp *mlxsw_sp)
> {
> + struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
> +
> + devlink_resource_occ_get_unregister(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS);
> + devlink_resource_occ_get_unregister(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS);
> + devlink_resource_occ_get_unregister(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE);
> + devlink_resource_occ_get_unregister(devlink,
> + MLXSW_SP_RESOURCE_KVD_LINEAR);
> mlxsw_sp_kvdl_parts_fini(mlxsw_sp);
> kfree(mlxsw_sp->kvdl);
> }
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index e21d8cadd480..2e4f71e16e95 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
> @@ -231,14 +231,6 @@ struct devlink_dpipe_headers {
> unsigned int headers_count;
> };
>
> -/**
> - * struct devlink_resource_ops - resource ops
> - * @occ_get: get the occupied size
> - */
> -struct devlink_resource_ops {
> - u64 (*occ_get)(struct devlink *devlink);
> -};
> -
> /**
> * struct devlink_resource_size_params - resource's size parameters
> * @size_min: minimum size which can be set
> @@ -265,6 +257,8 @@ devlink_resource_size_params_init(struct devlink_resource_size_params *size_para
> size_params->unit = unit;
> }
>
> +typedef u64 devlink_resource_occ_get_t(void *priv);
> +
> /**
> * struct devlink_resource - devlink resource
> * @name: name of the resource
> @@ -277,7 +271,6 @@ devlink_resource_size_params_init(struct devlink_resource_size_params *size_para
> * @size_params: size parameters
> * @list: parent list
> * @resource_list: list of child resources
> - * @resource_ops: resource ops
> */
> struct devlink_resource {
> const char *name;
> @@ -289,7 +282,8 @@ struct devlink_resource {
> struct devlink_resource_size_params size_params;
> struct list_head list;
> struct list_head resource_list;
> - const struct devlink_resource_ops *resource_ops;
> + devlink_resource_occ_get_t *occ_get;
> + void *occ_get_priv;
> };
>
> #define DEVLINK_RESOURCE_ID_PARENT_TOP 0
> @@ -409,8 +403,7 @@ int devlink_resource_register(struct devlink *devlink,
> u64 resource_size,
> u64 resource_id,
> u64 parent_resource_id,
> - const struct devlink_resource_size_params *size_params,
> - const struct devlink_resource_ops *resource_ops);
> + const struct devlink_resource_size_params *size_params);
> void devlink_resources_unregister(struct devlink *devlink,
> struct devlink_resource *resource);
> int devlink_resource_size_get(struct devlink *devlink,
> @@ -419,6 +412,12 @@ int devlink_resource_size_get(struct devlink *devlink,
> int devlink_dpipe_table_resource_set(struct devlink *devlink,
> const char *table_name, u64 resource_id,
> u64 resource_units);
> +void devlink_resource_occ_get_register(struct devlink *devlink,
> + u64 resource_id,
> + devlink_resource_occ_get_t *occ_get,
> + void *occ_get_priv);
> +void devlink_resource_occ_get_unregister(struct devlink *devlink,
> + u64 resource_id);
>
> #else
>
> @@ -562,8 +561,7 @@ devlink_resource_register(struct devlink *devlink,
> u64 resource_size,
> u64 resource_id,
> u64 parent_resource_id,
> - const struct devlink_resource_size_params *size_params,
> - const struct devlink_resource_ops *resource_ops)
> + const struct devlink_resource_size_params *size_params)
> {
> return 0;
> }
> @@ -589,6 +587,20 @@ devlink_dpipe_table_resource_set(struct devlink *devlink,
> return -EOPNOTSUPP;
> }
>
> +static inline void
> +devlink_resource_occ_get_register(struct devlink *devlink,
> + u64 resource_id,
> + devlink_resource_occ_get_t *occ_get,
> + void *occ_get_priv)
> +{
> +}
> +
> +static inline void
> +devlink_resource_occ_get_unregister(struct devlink *devlink,
> + u64 resource_id)
> +{
> +}
> +
> #endif
>
> #endif /* _NET_DEVLINK_H_ */
> diff --git a/net/core/devlink.c b/net/core/devlink.c
> index 9236e421bd62..ad1317376798 100644
> --- a/net/core/devlink.c
> +++ b/net/core/devlink.c
> @@ -2405,6 +2405,16 @@ devlink_resource_size_params_put(struct devlink_resource *resource,
> return 0;
> }
>
> +static int devlink_resource_occ_put(struct devlink_resource *resource,
> + struct sk_buff *skb)
> +{
> + if (!resource->occ_get)
> + return 0;
> + return nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_OCC,
> + resource->occ_get(resource->occ_get_priv),
> + DEVLINK_ATTR_PAD);
> +}
> +
> static int devlink_resource_put(struct devlink *devlink, struct sk_buff *skb,
> struct devlink_resource *resource)
> {
> @@ -2425,11 +2435,8 @@ static int devlink_resource_put(struct devlink *devlink, struct sk_buff *skb,
> if (resource->size != resource->size_new)
> nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_SIZE_NEW,
> resource->size_new, DEVLINK_ATTR_PAD);
> - if (resource->resource_ops && resource->resource_ops->occ_get)
> - if (nla_put_u64_64bit(skb, DEVLINK_ATTR_RESOURCE_OCC,
> - resource->resource_ops->occ_get(devlink),
> - DEVLINK_ATTR_PAD))
> - goto nla_put_failure;
> + if (devlink_resource_occ_put(resource, skb))
> + goto nla_put_failure;
> if (devlink_resource_size_params_put(resource, skb))
> goto nla_put_failure;
> if (list_empty(&resource->resource_list))
> @@ -3162,15 +3169,13 @@ EXPORT_SYMBOL_GPL(devlink_dpipe_table_unregister);
> * @resource_id: resource's id
> * @parent_reosurce_id: resource's parent id
> * @size params: size parameters
> - * @resource_ops: resource ops
> */
> int devlink_resource_register(struct devlink *devlink,
> const char *resource_name,
> u64 resource_size,
> u64 resource_id,
> u64 parent_resource_id,
> - const struct devlink_resource_size_params *size_params,
> - const struct devlink_resource_ops *resource_ops)
> + const struct devlink_resource_size_params *size_params)
> {
> struct devlink_resource *resource;
> struct list_head *resource_list;
> @@ -3213,7 +3218,6 @@ int devlink_resource_register(struct devlink *devlink,
> resource->size = resource_size;
> resource->size_new = resource_size;
> resource->id = resource_id;
> - resource->resource_ops = resource_ops;
> resource->size_valid = true;
> memcpy(&resource->size_params, size_params,
> sizeof(resource->size_params));
> @@ -3315,6 +3319,58 @@ int devlink_dpipe_table_resource_set(struct devlink *devlink,
> }
> EXPORT_SYMBOL_GPL(devlink_dpipe_table_resource_set);
>
> +/**
> + * devlink_resource_occ_get_register - register occupancy getter
> + *
> + * @devlink: devlink
> + * @resource_id: resource id
> + * @occ_get: occupancy getter callback
> + * @occ_get_priv: occupancy getter callback priv
> + */
> +void devlink_resource_occ_get_register(struct devlink *devlink,
> + u64 resource_id,
> + devlink_resource_occ_get_t *occ_get,
> + void *occ_get_priv)
> +{
> + struct devlink_resource *resource;
> +
> + mutex_lock(&devlink->lock);
> + resource = devlink_resource_find(devlink, NULL, resource_id);
> + if (WARN_ON(!resource))
> + goto out;
> + WARN_ON(resource->occ_get);
> +
> + resource->occ_get = occ_get;
> + resource->occ_get_priv = occ_get_priv;
> +out:
> + mutex_unlock(&devlink->lock);
> +}
> +EXPORT_SYMBOL_GPL(devlink_resource_occ_get_register);
> +
> +/**
> + * devlink_resource_occ_get_unregister - unregister occupancy getter
> + *
> + * @devlink: devlink
> + * @resource_id: resource id
> + */
> +void devlink_resource_occ_get_unregister(struct devlink *devlink,
> + u64 resource_id)
> +{
> + struct devlink_resource *resource;
> +
> + mutex_lock(&devlink->lock);
> + resource = devlink_resource_find(devlink, NULL, resource_id);
> + if (WARN_ON(!resource))
> + goto out;
> + WARN_ON(!resource->occ_get);
> +
> + resource->occ_get = NULL;
> + resource->occ_get_priv = NULL;
> +out:
> + mutex_unlock(&devlink->lock);
> +}
> +EXPORT_SYMBOL_GPL(devlink_resource_occ_get_unregister);
> +
> static int __init devlink_module_init(void)
> {
> return genl_register_family(&devlink_nl_family);
>
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