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devlink: convert occ_get op to separate registration

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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: d9f9b9a4d0 ("devlink: Add support for resource abstraction")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2018-04-05 22:13:21 +02:00 committed by David S. Miller
parent 5571196135
commit fc56be47da
6 changed files with 165 additions and 106 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -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;

1
drivers/net/ethernet/mellanox/mlxsw/spectrum.h
View File

@ -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 {

67
drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
View File

@ -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 @@ err_kvdl_parts_init:
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);
}

65
drivers/net/netdevsim/devlink.c
View File

@ -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;
}

40
include/net/devlink.h
View File

@ -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_ */

74
net/core/devlink.c
View File

@ -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 @@ out:
}
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);