From fc56be47da8cb111add373c36230b0139139898f Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Thu, 5 Apr 2018 22:13:21 +0200 Subject: devlink: convert occ_get op to separate registration 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. The example flows, as it is in mlxsw: 1) driver load/asic probe: mlxsw_core -> mlxsw_sp_resources_register -> mlxsw_sp_kvdl_resources_register -> devlink_resource_register IDX mlxsw_spectrum -> mlxsw_sp_kvdl_init -> mlxsw_sp_kvdl_parts_init -> mlxsw_sp_kvdl_part_init -> devlink_resource_size_get IDX (to get the current setup size from devlink) -> devlink_resource_occ_get_register IDX (register current occupancy getter) 2) reload triggered by devlink command: -> mlxsw_devlink_core_bus_device_reload -> mlxsw_sp_fini -> mlxsw_sp_kvdl_fini -> devlink_resource_occ_get_unregister IDX (struct mlxsw_sp *mlxsw_sp is freed at this point, call to occ get which is using mlxsw_sp would cause use-after free) -> mlxsw_sp_init -> mlxsw_sp_kvdl_init -> mlxsw_sp_kvdl_parts_init -> mlxsw_sp_kvdl_part_init -> devlink_resource_size_get IDX (to get the current setup size from devlink) -> devlink_resource_occ_get_register IDX (register current occupancy getter) Fixes: d9f9b9a4d05f ("devlink: Add support for resource abstraction") Signed-off-by: Jiri Pirko Signed-off-by: David S. Miller --- include/net/devlink.h | 40 ++++++++++++++++++++++++++-------------- 1 file changed, 26 insertions(+), 14 deletions(-) (limited to 'include/net/devlink.h') 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_ */ -- cgit v1.2.3