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Commit fc56be47 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

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: d9f9b9a4 ("devlink: Add support for resource abstraction")
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 55711961

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

+4 −20
Original line number Diff line number Diff line
@@ -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;

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

+0 −1
Original line number Diff line number Diff line
@@ -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 mlxsw_core *mlxsw_core);



struct mlxsw_sp_acl_rule_info {

drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c

+39 −28
Original line number Diff line number Diff line
@@ -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 mlxsw_core *mlxsw_core)

{

	struct devlink *devlink = priv_to_devlink(mlxsw_core);
@@ -386,8 +372,7 @@ int mlxsw_sp_kvdl_resources_register(struct mlxsw_core *mlxsw_core) 
					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 mlxsw_core *mlxsw_core) 
					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 mlxsw_core *mlxsw_core) 
					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);

}

drivers/net/netdevsim/devlink.c

+31 −34
Original line number Diff line number Diff line
@@ -30,52 +30,36 @@ static struct net *nsim_devlink_net(struct devlink *devlink) 


/* IPv4

 */

static u64 nsim_ipv4_fib_resource_occ_get(struct devlink *devlink)

static u64 nsim_ipv4_fib_resource_occ_get(void *priv)

{

	struct net *net = nsim_devlink_net(devlink);

	struct net *net = priv;



	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, false);

}



static struct devlink_resource_ops nsim_ipv4_fib_res_ops = {

	.occ_get = nsim_ipv4_fib_resource_occ_get,

};



static u64 nsim_ipv4_fib_rules_res_occ_get(struct devlink *devlink)

static u64 nsim_ipv4_fib_rules_res_occ_get(void *priv)

{

	struct net *net = nsim_devlink_net(devlink);

	struct net *net = priv;



	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, false);

}



static struct devlink_resource_ops nsim_ipv4_fib_rules_res_ops = {

	.occ_get = nsim_ipv4_fib_rules_res_occ_get,

};



/* IPv6

 */

static u64 nsim_ipv6_fib_resource_occ_get(struct devlink *devlink)

static u64 nsim_ipv6_fib_resource_occ_get(void *priv)

{

	struct net *net = nsim_devlink_net(devlink);

	struct net *net = priv;



	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, false);

}



static struct devlink_resource_ops nsim_ipv6_fib_res_ops = {

	.occ_get = nsim_ipv6_fib_resource_occ_get,

};



static u64 nsim_ipv6_fib_rules_res_occ_get(struct devlink *devlink)

static u64 nsim_ipv6_fib_rules_res_occ_get(void *priv)

{

	struct net *net = nsim_devlink_net(devlink);

	struct net *net = priv;



	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, false);

}



static struct devlink_resource_ops nsim_ipv6_fib_rules_res_ops = {

	.occ_get = nsim_ipv6_fib_rules_res_occ_get,

};



static int devlink_resources_register(struct devlink *devlink)

{

	struct devlink_resource_size_params params = {
@@ -91,7 +75,7 @@ static int devlink_resources_register(struct devlink *devlink) 
	err = devlink_resource_register(devlink, "IPv4", (u64)-1,

					NSIM_RESOURCE_IPV4,

					DEVLINK_RESOURCE_ID_PARENT_TOP,

					&params, NULL);

					&params);

	if (err) {

		pr_err("Failed to register IPv4 top resource\n");

		goto out;
@@ -100,8 +84,7 @@ static int devlink_resources_register(struct devlink *devlink) 
	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, true);

	err = devlink_resource_register(devlink, "fib", n,

					NSIM_RESOURCE_IPV4_FIB,

					NSIM_RESOURCE_IPV4,

					&params, &nsim_ipv4_fib_res_ops);

					NSIM_RESOURCE_IPV4, &params);

	if (err) {

		pr_err("Failed to register IPv4 FIB resource\n");

		return err;
@@ -110,8 +93,7 @@ static int devlink_resources_register(struct devlink *devlink) 
	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, true);

	err = devlink_resource_register(devlink, "fib-rules", n,

					NSIM_RESOURCE_IPV4_FIB_RULES,

					NSIM_RESOURCE_IPV4,

					&params, &nsim_ipv4_fib_rules_res_ops);

					NSIM_RESOURCE_IPV4, &params);

	if (err) {

		pr_err("Failed to register IPv4 FIB rules resource\n");

		return err;
@@ -121,7 +103,7 @@ static int devlink_resources_register(struct devlink *devlink) 
	err = devlink_resource_register(devlink, "IPv6", (u64)-1,

					NSIM_RESOURCE_IPV6,

					DEVLINK_RESOURCE_ID_PARENT_TOP,

					&params, NULL);

					&params);

	if (err) {

		pr_err("Failed to register IPv6 top resource\n");

		goto out;
@@ -130,8 +112,7 @@ static int devlink_resources_register(struct devlink *devlink) 
	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, true);

	err = devlink_resource_register(devlink, "fib", n,

					NSIM_RESOURCE_IPV6_FIB,

					NSIM_RESOURCE_IPV6,

					&params, &nsim_ipv6_fib_res_ops);

					NSIM_RESOURCE_IPV6, &params);

	if (err) {

		pr_err("Failed to register IPv6 FIB resource\n");

		return err;
@@ -140,12 +121,28 @@ static int devlink_resources_register(struct devlink *devlink) 
	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, true);

	err = devlink_resource_register(devlink, "fib-rules", n,

					NSIM_RESOURCE_IPV6_FIB_RULES,

					NSIM_RESOURCE_IPV6,

					&params, &nsim_ipv6_fib_rules_res_ops);

					NSIM_RESOURCE_IPV6, &params);

	if (err) {

		pr_err("Failed to register IPv6 FIB rules resource\n");

		return err;

	}



	devlink_resource_occ_get_register(devlink,

					  NSIM_RESOURCE_IPV4_FIB,

					  nsim_ipv4_fib_resource_occ_get,

					  net);

	devlink_resource_occ_get_register(devlink,

					  NSIM_RESOURCE_IPV4_FIB_RULES,

					  nsim_ipv4_fib_rules_res_occ_get,

					  net);

	devlink_resource_occ_get_register(devlink,

					  NSIM_RESOURCE_IPV6_FIB,

					  nsim_ipv6_fib_resource_occ_get,

					  net);

	devlink_resource_occ_get_register(devlink,

					  NSIM_RESOURCE_IPV6_FIB_RULES,

					  nsim_ipv6_fib_rules_res_occ_get,

					  net);

out:

	return err;

}

include/net/devlink.h

+26 −14
Original line number Diff line number Diff line
@@ -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_ */