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devlink.c
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devlink.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/core/devlink.c - Network physical/parent device Netlink interface
*
* Heavily inspired by net/wireless/
* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
* Copyright (c) 2016 Jiri Pirko <[email protected]>
*/
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/gfp.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/refcount.h>
#include <linux/workqueue.h>
#include <linux/u64_stats_sync.h>
#include <linux/timekeeping.h>
#include <rdma/ib_verbs.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/devlink.h>
#define CREATE_TRACE_POINTS
#include <trace/events/devlink.h>
#define DEVLINK_RELOAD_STATS_ARRAY_SIZE \
(__DEVLINK_RELOAD_LIMIT_MAX * __DEVLINK_RELOAD_ACTION_MAX)
struct devlink_dev_stats {
u32 reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
u32 remote_reload_stats[DEVLINK_RELOAD_STATS_ARRAY_SIZE];
};
struct devlink {
u32 index;
struct list_head port_list;
struct list_head rate_list;
struct list_head sb_list;
struct list_head dpipe_table_list;
struct list_head resource_list;
struct list_head param_list;
struct list_head region_list;
struct list_head reporter_list;
struct mutex reporters_lock; /* protects reporter_list */
struct devlink_dpipe_headers *dpipe_headers;
struct list_head trap_list;
struct list_head trap_group_list;
struct list_head trap_policer_list;
struct list_head linecard_list;
struct mutex linecards_lock; /* protects linecard_list */
const struct devlink_ops *ops;
u64 features;
struct xarray snapshot_ids;
struct devlink_dev_stats stats;
struct device *dev;
possible_net_t _net;
/* Serializes access to devlink instance specific objects such as
* port, sb, dpipe, resource, params, region, traps and more.
*/
struct mutex lock;
struct lock_class_key lock_key;
u8 reload_failed:1;
refcount_t refcount;
struct completion comp;
struct rcu_head rcu;
char priv[] __aligned(NETDEV_ALIGN);
};
struct devlink_linecard_ops;
struct devlink_linecard_type;
struct devlink_linecard {
struct list_head list;
struct devlink *devlink;
unsigned int index;
refcount_t refcount;
const struct devlink_linecard_ops *ops;
void *priv;
enum devlink_linecard_state state;
struct mutex state_lock; /* Protects state */
const char *type;
struct devlink_linecard_type *types;
unsigned int types_count;
struct devlink *nested_devlink;
};
/**
* struct devlink_resource - devlink resource
* @name: name of the resource
* @id: id, per devlink instance
* @size: size of the resource
* @size_new: updated size of the resource, reload is needed
* @size_valid: valid in case the total size of the resource is valid
* including its children
* @parent: parent resource
* @size_params: size parameters
* @list: parent list
* @resource_list: list of child resources
* @occ_get: occupancy getter callback
* @occ_get_priv: occupancy getter callback priv
*/
struct devlink_resource {
const char *name;
u64 id;
u64 size;
u64 size_new;
bool size_valid;
struct devlink_resource *parent;
struct devlink_resource_size_params size_params;
struct list_head list;
struct list_head resource_list;
devlink_resource_occ_get_t *occ_get;
void *occ_get_priv;
};
void *devlink_priv(struct devlink *devlink)
{
return &devlink->priv;
}
EXPORT_SYMBOL_GPL(devlink_priv);
struct devlink *priv_to_devlink(void *priv)
{
return container_of(priv, struct devlink, priv);
}
EXPORT_SYMBOL_GPL(priv_to_devlink);
struct device *devlink_to_dev(const struct devlink *devlink)
{
return devlink->dev;
}
EXPORT_SYMBOL_GPL(devlink_to_dev);
static struct devlink_dpipe_field devlink_dpipe_fields_ethernet[] = {
{
.name = "destination mac",
.id = DEVLINK_DPIPE_FIELD_ETHERNET_DST_MAC,
.bitwidth = 48,
},
};
struct devlink_dpipe_header devlink_dpipe_header_ethernet = {
.name = "ethernet",
.id = DEVLINK_DPIPE_HEADER_ETHERNET,
.fields = devlink_dpipe_fields_ethernet,
.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ethernet),
.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ethernet);
static struct devlink_dpipe_field devlink_dpipe_fields_ipv4[] = {
{
.name = "destination ip",
.id = DEVLINK_DPIPE_FIELD_IPV4_DST_IP,
.bitwidth = 32,
},
};
struct devlink_dpipe_header devlink_dpipe_header_ipv4 = {
.name = "ipv4",
.id = DEVLINK_DPIPE_HEADER_IPV4,
.fields = devlink_dpipe_fields_ipv4,
.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv4),
.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ipv4);
static struct devlink_dpipe_field devlink_dpipe_fields_ipv6[] = {
{
.name = "destination ip",
.id = DEVLINK_DPIPE_FIELD_IPV6_DST_IP,
.bitwidth = 128,
},
};
struct devlink_dpipe_header devlink_dpipe_header_ipv6 = {
.name = "ipv6",
.id = DEVLINK_DPIPE_HEADER_IPV6,
.fields = devlink_dpipe_fields_ipv6,
.fields_count = ARRAY_SIZE(devlink_dpipe_fields_ipv6),
.global = true,
};
EXPORT_SYMBOL_GPL(devlink_dpipe_header_ipv6);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwmsg);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_hwerr);
EXPORT_TRACEPOINT_SYMBOL_GPL(devlink_trap_report);
static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_ATTR_MAX + 1] = {
[DEVLINK_PORT_FUNCTION_ATTR_HW_ADDR] = { .type = NLA_BINARY },
[DEVLINK_PORT_FN_ATTR_STATE] =
NLA_POLICY_RANGE(NLA_U8, DEVLINK_PORT_FN_STATE_INACTIVE,
DEVLINK_PORT_FN_STATE_ACTIVE),
};
static const struct nla_policy devlink_selftest_nl_policy[DEVLINK_ATTR_SELFTEST_ID_MAX + 1] = {
[DEVLINK_ATTR_SELFTEST_ID_FLASH] = { .type = NLA_FLAG },
};
static DEFINE_XARRAY_FLAGS(devlinks, XA_FLAGS_ALLOC);
#define DEVLINK_REGISTERED XA_MARK_1
#define DEVLINK_UNREGISTERING XA_MARK_2
/* devlink instances are open to the access from the user space after
* devlink_register() call. Such logical barrier allows us to have certain
* expectations related to locking.
*
* Before *_register() - we are in initialization stage and no parallel
* access possible to the devlink instance. All drivers perform that phase
* by implicitly holding device_lock.
*
* After *_register() - users and driver can access devlink instance at
* the same time.
*/
#define ASSERT_DEVLINK_REGISTERED(d) \
WARN_ON_ONCE(!xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
#define ASSERT_DEVLINK_NOT_REGISTERED(d) \
WARN_ON_ONCE(xa_get_mark(&devlinks, (d)->index, DEVLINK_REGISTERED))
struct net *devlink_net(const struct devlink *devlink)
{
return read_pnet(&devlink->_net);
}
EXPORT_SYMBOL_GPL(devlink_net);
static void __devlink_put_rcu(struct rcu_head *head)
{
struct devlink *devlink = container_of(head, struct devlink, rcu);
complete(&devlink->comp);
}
void devlink_put(struct devlink *devlink)
{
if (refcount_dec_and_test(&devlink->refcount))
/* Make sure unregister operation that may await the completion
* is unblocked only after all users are after the end of
* RCU grace period.
*/
call_rcu(&devlink->rcu, __devlink_put_rcu);
}
struct devlink *__must_check devlink_try_get(struct devlink *devlink)
{
if (refcount_inc_not_zero(&devlink->refcount))
return devlink;
return NULL;
}
void devl_assert_locked(struct devlink *devlink)
{
lockdep_assert_held(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devl_assert_locked);
#ifdef CONFIG_LOCKDEP
/* For use in conjunction with LOCKDEP only e.g. rcu_dereference_protected() */
bool devl_lock_is_held(struct devlink *devlink)
{
return lockdep_is_held(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devl_lock_is_held);
#endif
void devl_lock(struct devlink *devlink)
{
mutex_lock(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devl_lock);
int devl_trylock(struct devlink *devlink)
{
return mutex_trylock(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devl_trylock);
void devl_unlock(struct devlink *devlink)
{
mutex_unlock(&devlink->lock);
}
EXPORT_SYMBOL_GPL(devl_unlock);
static struct devlink *
devlinks_xa_find_get(struct net *net, unsigned long *indexp, xa_mark_t filter,
void * (*xa_find_fn)(struct xarray *, unsigned long *,
unsigned long, xa_mark_t))
{
struct devlink *devlink;
rcu_read_lock();
retry:
devlink = xa_find_fn(&devlinks, indexp, ULONG_MAX, DEVLINK_REGISTERED);
if (!devlink)
goto unlock;
/* In case devlink_unregister() was already called and "unregistering"
* mark was set, do not allow to get a devlink reference here.
* This prevents live-lock of devlink_unregister() wait for completion.
*/
if (xa_get_mark(&devlinks, *indexp, DEVLINK_UNREGISTERING))
goto retry;
/* For a possible retry, the xa_find_after() should be always used */
xa_find_fn = xa_find_after;
if (!devlink_try_get(devlink))
goto retry;
if (!net_eq(devlink_net(devlink), net)) {
devlink_put(devlink);
goto retry;
}
unlock:
rcu_read_unlock();
return devlink;
}
static struct devlink *devlinks_xa_find_get_first(struct net *net,
unsigned long *indexp,
xa_mark_t filter)
{
return devlinks_xa_find_get(net, indexp, filter, xa_find);
}
static struct devlink *devlinks_xa_find_get_next(struct net *net,
unsigned long *indexp,
xa_mark_t filter)
{
return devlinks_xa_find_get(net, indexp, filter, xa_find_after);
}
/* Iterate over devlink pointers which were possible to get reference to.
* devlink_put() needs to be called for each iterated devlink pointer
* in loop body in order to release the reference.
*/
#define devlinks_xa_for_each_get(net, index, devlink, filter) \
for (index = 0, \
devlink = devlinks_xa_find_get_first(net, &index, filter); \
devlink; devlink = devlinks_xa_find_get_next(net, &index, filter))
#define devlinks_xa_for_each_registered_get(net, index, devlink) \
devlinks_xa_for_each_get(net, index, devlink, DEVLINK_REGISTERED)
static struct devlink *devlink_get_from_attrs(struct net *net,
struct nlattr **attrs)
{
struct devlink *devlink;
unsigned long index;
char *busname;
char *devname;
if (!attrs[DEVLINK_ATTR_BUS_NAME] || !attrs[DEVLINK_ATTR_DEV_NAME])
return ERR_PTR(-EINVAL);
busname = nla_data(attrs[DEVLINK_ATTR_BUS_NAME]);
devname = nla_data(attrs[DEVLINK_ATTR_DEV_NAME]);
devlinks_xa_for_each_registered_get(net, index, devlink) {
if (strcmp(devlink->dev->bus->name, busname) == 0 &&
strcmp(dev_name(devlink->dev), devname) == 0)
return devlink;
devlink_put(devlink);
}
return ERR_PTR(-ENODEV);
}
#define ASSERT_DEVLINK_PORT_REGISTERED(devlink_port) \
WARN_ON_ONCE(!(devlink_port)->registered)
#define ASSERT_DEVLINK_PORT_NOT_REGISTERED(devlink_port) \
WARN_ON_ONCE((devlink_port)->registered)
#define ASSERT_DEVLINK_PORT_INITIALIZED(devlink_port) \
WARN_ON_ONCE(!(devlink_port)->initialized)
static struct devlink_port *devlink_port_get_by_index(struct devlink *devlink,
unsigned int port_index)
{
struct devlink_port *devlink_port;
list_for_each_entry(devlink_port, &devlink->port_list, list) {
if (devlink_port->index == port_index)
return devlink_port;
}
return NULL;
}
static bool devlink_port_index_exists(struct devlink *devlink,
unsigned int port_index)
{
return devlink_port_get_by_index(devlink, port_index);
}
static struct devlink_port *devlink_port_get_from_attrs(struct devlink *devlink,
struct nlattr **attrs)
{
if (attrs[DEVLINK_ATTR_PORT_INDEX]) {
u32 port_index = nla_get_u32(attrs[DEVLINK_ATTR_PORT_INDEX]);
struct devlink_port *devlink_port;
devlink_port = devlink_port_get_by_index(devlink, port_index);
if (!devlink_port)
return ERR_PTR(-ENODEV);
return devlink_port;
}
return ERR_PTR(-EINVAL);
}
static struct devlink_port *devlink_port_get_from_info(struct devlink *devlink,
struct genl_info *info)
{
return devlink_port_get_from_attrs(devlink, info->attrs);
}
static inline bool
devlink_rate_is_leaf(struct devlink_rate *devlink_rate)
{
return devlink_rate->type == DEVLINK_RATE_TYPE_LEAF;
}
static inline bool
devlink_rate_is_node(struct devlink_rate *devlink_rate)
{
return devlink_rate->type == DEVLINK_RATE_TYPE_NODE;
}
static struct devlink_rate *
devlink_rate_leaf_get_from_info(struct devlink *devlink, struct genl_info *info)
{
struct devlink_rate *devlink_rate;
struct devlink_port *devlink_port;
devlink_port = devlink_port_get_from_attrs(devlink, info->attrs);
if (IS_ERR(devlink_port))
return ERR_CAST(devlink_port);
devlink_rate = devlink_port->devlink_rate;
return devlink_rate ?: ERR_PTR(-ENODEV);
}
static struct devlink_rate *
devlink_rate_node_get_by_name(struct devlink *devlink, const char *node_name)
{
static struct devlink_rate *devlink_rate;
list_for_each_entry(devlink_rate, &devlink->rate_list, list) {
if (devlink_rate_is_node(devlink_rate) &&
!strcmp(node_name, devlink_rate->name))
return devlink_rate;
}
return ERR_PTR(-ENODEV);
}
static struct devlink_rate *
devlink_rate_node_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
{
const char *rate_node_name;
size_t len;
if (!attrs[DEVLINK_ATTR_RATE_NODE_NAME])
return ERR_PTR(-EINVAL);
rate_node_name = nla_data(attrs[DEVLINK_ATTR_RATE_NODE_NAME]);
len = strlen(rate_node_name);
/* Name cannot be empty or decimal number */
if (!len || strspn(rate_node_name, "0123456789") == len)
return ERR_PTR(-EINVAL);
return devlink_rate_node_get_by_name(devlink, rate_node_name);
}
static struct devlink_rate *
devlink_rate_node_get_from_info(struct devlink *devlink, struct genl_info *info)
{
return devlink_rate_node_get_from_attrs(devlink, info->attrs);
}
static struct devlink_rate *
devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
if (attrs[DEVLINK_ATTR_PORT_INDEX])
return devlink_rate_leaf_get_from_info(devlink, info);
else if (attrs[DEVLINK_ATTR_RATE_NODE_NAME])
return devlink_rate_node_get_from_info(devlink, info);
else
return ERR_PTR(-EINVAL);
}
static struct devlink_linecard *
devlink_linecard_get_by_index(struct devlink *devlink,
unsigned int linecard_index)
{
struct devlink_linecard *devlink_linecard;
list_for_each_entry(devlink_linecard, &devlink->linecard_list, list) {
if (devlink_linecard->index == linecard_index)
return devlink_linecard;
}
return NULL;
}
static bool devlink_linecard_index_exists(struct devlink *devlink,
unsigned int linecard_index)
{
return devlink_linecard_get_by_index(devlink, linecard_index);
}
static struct devlink_linecard *
devlink_linecard_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
{
if (attrs[DEVLINK_ATTR_LINECARD_INDEX]) {
u32 linecard_index = nla_get_u32(attrs[DEVLINK_ATTR_LINECARD_INDEX]);
struct devlink_linecard *linecard;
mutex_lock(&devlink->linecards_lock);
linecard = devlink_linecard_get_by_index(devlink, linecard_index);
if (linecard)
refcount_inc(&linecard->refcount);
mutex_unlock(&devlink->linecards_lock);
if (!linecard)
return ERR_PTR(-ENODEV);
return linecard;
}
return ERR_PTR(-EINVAL);
}
static struct devlink_linecard *
devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info)
{
return devlink_linecard_get_from_attrs(devlink, info->attrs);
}
static void devlink_linecard_put(struct devlink_linecard *linecard)
{
if (refcount_dec_and_test(&linecard->refcount)) {
mutex_destroy(&linecard->state_lock);
kfree(linecard);
}
}
struct devlink_sb {
struct list_head list;
unsigned int index;
u32 size;
u16 ingress_pools_count;
u16 egress_pools_count;
u16 ingress_tc_count;
u16 egress_tc_count;
};
static u16 devlink_sb_pool_count(struct devlink_sb *devlink_sb)
{
return devlink_sb->ingress_pools_count + devlink_sb->egress_pools_count;
}
static struct devlink_sb *devlink_sb_get_by_index(struct devlink *devlink,
unsigned int sb_index)
{
struct devlink_sb *devlink_sb;
list_for_each_entry(devlink_sb, &devlink->sb_list, list) {
if (devlink_sb->index == sb_index)
return devlink_sb;
}
return NULL;
}
static bool devlink_sb_index_exists(struct devlink *devlink,
unsigned int sb_index)
{
return devlink_sb_get_by_index(devlink, sb_index);
}
static struct devlink_sb *devlink_sb_get_from_attrs(struct devlink *devlink,
struct nlattr **attrs)
{
if (attrs[DEVLINK_ATTR_SB_INDEX]) {
u32 sb_index = nla_get_u32(attrs[DEVLINK_ATTR_SB_INDEX]);
struct devlink_sb *devlink_sb;
devlink_sb = devlink_sb_get_by_index(devlink, sb_index);
if (!devlink_sb)
return ERR_PTR(-ENODEV);
return devlink_sb;
}
return ERR_PTR(-EINVAL);
}
static struct devlink_sb *devlink_sb_get_from_info(struct devlink *devlink,
struct genl_info *info)
{
return devlink_sb_get_from_attrs(devlink, info->attrs);
}
static int devlink_sb_pool_index_get_from_attrs(struct devlink_sb *devlink_sb,
struct nlattr **attrs,
u16 *p_pool_index)
{
u16 val;
if (!attrs[DEVLINK_ATTR_SB_POOL_INDEX])
return -EINVAL;
val = nla_get_u16(attrs[DEVLINK_ATTR_SB_POOL_INDEX]);
if (val >= devlink_sb_pool_count(devlink_sb))
return -EINVAL;
*p_pool_index = val;
return 0;
}
static int devlink_sb_pool_index_get_from_info(struct devlink_sb *devlink_sb,
struct genl_info *info,
u16 *p_pool_index)
{
return devlink_sb_pool_index_get_from_attrs(devlink_sb, info->attrs,
p_pool_index);
}
static int
devlink_sb_pool_type_get_from_attrs(struct nlattr **attrs,
enum devlink_sb_pool_type *p_pool_type)
{
u8 val;
if (!attrs[DEVLINK_ATTR_SB_POOL_TYPE])
return -EINVAL;
val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_TYPE]);
if (val != DEVLINK_SB_POOL_TYPE_INGRESS &&
val != DEVLINK_SB_POOL_TYPE_EGRESS)
return -EINVAL;
*p_pool_type = val;
return 0;
}
static int
devlink_sb_pool_type_get_from_info(struct genl_info *info,
enum devlink_sb_pool_type *p_pool_type)
{
return devlink_sb_pool_type_get_from_attrs(info->attrs, p_pool_type);
}
static int
devlink_sb_th_type_get_from_attrs(struct nlattr **attrs,
enum devlink_sb_threshold_type *p_th_type)
{
u8 val;
if (!attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE])
return -EINVAL;
val = nla_get_u8(attrs[DEVLINK_ATTR_SB_POOL_THRESHOLD_TYPE]);
if (val != DEVLINK_SB_THRESHOLD_TYPE_STATIC &&
val != DEVLINK_SB_THRESHOLD_TYPE_DYNAMIC)
return -EINVAL;
*p_th_type = val;
return 0;
}
static int
devlink_sb_th_type_get_from_info(struct genl_info *info,
enum devlink_sb_threshold_type *p_th_type)
{
return devlink_sb_th_type_get_from_attrs(info->attrs, p_th_type);
}
static int
devlink_sb_tc_index_get_from_attrs(struct devlink_sb *devlink_sb,
struct nlattr **attrs,
enum devlink_sb_pool_type pool_type,
u16 *p_tc_index)
{
u16 val;
if (!attrs[DEVLINK_ATTR_SB_TC_INDEX])
return -EINVAL;
val = nla_get_u16(attrs[DEVLINK_ATTR_SB_TC_INDEX]);
if (pool_type == DEVLINK_SB_POOL_TYPE_INGRESS &&
val >= devlink_sb->ingress_tc_count)
return -EINVAL;
if (pool_type == DEVLINK_SB_POOL_TYPE_EGRESS &&
val >= devlink_sb->egress_tc_count)
return -EINVAL;
*p_tc_index = val;
return 0;
}
static int
devlink_sb_tc_index_get_from_info(struct devlink_sb *devlink_sb,
struct genl_info *info,
enum devlink_sb_pool_type pool_type,
u16 *p_tc_index)
{
return devlink_sb_tc_index_get_from_attrs(devlink_sb, info->attrs,
pool_type, p_tc_index);
}
struct devlink_region {
struct devlink *devlink;
struct devlink_port *port;
struct list_head list;
union {
const struct devlink_region_ops *ops;
const struct devlink_port_region_ops *port_ops;
};
struct mutex snapshot_lock; /* protects snapshot_list,
* max_snapshots and cur_snapshots
* consistency.
*/
struct list_head snapshot_list;
u32 max_snapshots;
u32 cur_snapshots;
u64 size;
};
struct devlink_snapshot {
struct list_head list;
struct devlink_region *region;
u8 *data;
u32 id;
};
static struct devlink_region *
devlink_region_get_by_name(struct devlink *devlink, const char *region_name)
{
struct devlink_region *region;
list_for_each_entry(region, &devlink->region_list, list)
if (!strcmp(region->ops->name, region_name))
return region;
return NULL;
}
static struct devlink_region *
devlink_port_region_get_by_name(struct devlink_port *port,
const char *region_name)
{
struct devlink_region *region;
list_for_each_entry(region, &port->region_list, list)
if (!strcmp(region->ops->name, region_name))
return region;
return NULL;
}
static struct devlink_snapshot *
devlink_region_snapshot_get_by_id(struct devlink_region *region, u32 id)
{
struct devlink_snapshot *snapshot;
list_for_each_entry(snapshot, ®ion->snapshot_list, list)
if (snapshot->id == id)
return snapshot;
return NULL;
}
#define DEVLINK_NL_FLAG_NEED_PORT BIT(0)
#define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT BIT(1)
#define DEVLINK_NL_FLAG_NEED_RATE BIT(2)
#define DEVLINK_NL_FLAG_NEED_RATE_NODE BIT(3)
#define DEVLINK_NL_FLAG_NEED_LINECARD BIT(4)
static int devlink_nl_pre_doit(const struct genl_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
struct devlink_linecard *linecard;
struct devlink_port *devlink_port;
struct devlink *devlink;
int err;
devlink = devlink_get_from_attrs(genl_info_net(info), info->attrs);
if (IS_ERR(devlink))
return PTR_ERR(devlink);
devl_lock(devlink);
info->user_ptr[0] = devlink;
if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_PORT) {
devlink_port = devlink_port_get_from_info(devlink, info);
if (IS_ERR(devlink_port)) {
err = PTR_ERR(devlink_port);
goto unlock;
}
info->user_ptr[1] = devlink_port;
} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT) {
devlink_port = devlink_port_get_from_info(devlink, info);
if (!IS_ERR(devlink_port))
info->user_ptr[1] = devlink_port;
} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_RATE) {
struct devlink_rate *devlink_rate;
devlink_rate = devlink_rate_get_from_info(devlink, info);
if (IS_ERR(devlink_rate)) {
err = PTR_ERR(devlink_rate);
goto unlock;
}
info->user_ptr[1] = devlink_rate;
} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_RATE_NODE) {
struct devlink_rate *rate_node;
rate_node = devlink_rate_node_get_from_info(devlink, info);
if (IS_ERR(rate_node)) {
err = PTR_ERR(rate_node);
goto unlock;
}
info->user_ptr[1] = rate_node;
} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_LINECARD) {
linecard = devlink_linecard_get_from_info(devlink, info);
if (IS_ERR(linecard)) {
err = PTR_ERR(linecard);
goto unlock;
}
info->user_ptr[1] = linecard;
}
return 0;
unlock:
devl_unlock(devlink);
devlink_put(devlink);
return err;
}
static void devlink_nl_post_doit(const struct genl_ops *ops,
struct sk_buff *skb, struct genl_info *info)
{
struct devlink_linecard *linecard;
struct devlink *devlink;
devlink = info->user_ptr[0];
if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_LINECARD) {
linecard = info->user_ptr[1];
devlink_linecard_put(linecard);
}
devl_unlock(devlink);
devlink_put(devlink);
}
static struct genl_family devlink_nl_family;
enum devlink_multicast_groups {
DEVLINK_MCGRP_CONFIG,
};
static const struct genl_multicast_group devlink_nl_mcgrps[] = {
[DEVLINK_MCGRP_CONFIG] = { .name = DEVLINK_GENL_MCGRP_CONFIG_NAME },
};
static int devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
{
if (nla_put_string(msg, DEVLINK_ATTR_BUS_NAME, devlink->dev->bus->name))
return -EMSGSIZE;
if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
return -EMSGSIZE;
return 0;
}
static int devlink_nl_put_nested_handle(struct sk_buff *msg, struct devlink *devlink)
{
struct nlattr *nested_attr;
nested_attr = nla_nest_start(msg, DEVLINK_ATTR_NESTED_DEVLINK);
if (!nested_attr)
return -EMSGSIZE;
if (devlink_nl_put_handle(msg, devlink))
goto nla_put_failure;
nla_nest_end(msg, nested_attr);
return 0;
nla_put_failure:
nla_nest_cancel(msg, nested_attr);
return -EMSGSIZE;
}
struct devlink_reload_combination {
enum devlink_reload_action action;
enum devlink_reload_limit limit;
};
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 = DEVLINK_RELOAD_LIMIT_NO_RESET,
},
};
static bool
devlink_reload_combination_is_invalid(enum devlink_reload_action action,
enum devlink_reload_limit limit)
{
int i;
for (i = 0; i < ARRAY_SIZE(devlink_reload_invalid_combinations); i++)
if (devlink_reload_invalid_combinations[i].action == action &&
devlink_reload_invalid_combinations[i].limit == limit)
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->reload_actions);
}
static bool
devlink_reload_limit_is_supported(struct devlink *devlink, enum devlink_reload_limit limit)
{
return test_bit(limit, &devlink->ops->reload_limits);
}
static int devlink_reload_stat_put(struct sk_buff *msg,
enum devlink_reload_limit limit, u32 value)
{
struct nlattr *reload_stats_entry;
reload_stats_entry = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_STATS_ENTRY);
if (!reload_stats_entry)
return -EMSGSIZE;
if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_STATS_LIMIT, limit) ||
nla_put_u32(msg, DEVLINK_ATTR_RELOAD_STATS_VALUE, value))
goto nla_put_failure;
nla_nest_end(msg, reload_stats_entry);
return 0;
nla_put_failure:
nla_nest_cancel(msg, reload_stats_entry);
return -EMSGSIZE;
}
static int devlink_reload_stats_put(struct sk_buff *msg, struct devlink *devlink, bool is_remote)
{
struct nlattr *reload_stats_attr, *act_info, *act_stats;
int i, j, stat_idx;
u32 value;
if (!is_remote)
reload_stats_attr = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_STATS);
else
reload_stats_attr = nla_nest_start(msg, DEVLINK_ATTR_REMOTE_RELOAD_STATS);
if (!reload_stats_attr)
return -EMSGSIZE;
for (i = 0; i <= DEVLINK_RELOAD_ACTION_MAX; i++) {
if ((!is_remote &&
!devlink_reload_action_is_supported(devlink, i)) ||
i == DEVLINK_RELOAD_ACTION_UNSPEC)
continue;
act_info = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_ACTION_INFO);
if (!act_info)
goto nla_put_failure;
if (nla_put_u8(msg, DEVLINK_ATTR_RELOAD_ACTION, i))
goto action_info_nest_cancel;
act_stats = nla_nest_start(msg, DEVLINK_ATTR_RELOAD_ACTION_STATS);
if (!act_stats)
goto action_info_nest_cancel;
for (j = 0; j <= DEVLINK_RELOAD_LIMIT_MAX; j++) {
/* Remote stats are shown even if not locally supported.
* Stats of actions with unspecified limit are shown
* though drivers don't need to register unspecified
* limit.
*/
if ((!is_remote && j != DEVLINK_RELOAD_LIMIT_UNSPEC &&
!devlink_reload_limit_is_supported(devlink, j)) ||
devlink_reload_combination_is_invalid(i, j))
continue;
stat_idx = j * __DEVLINK_RELOAD_ACTION_MAX + i;
if (!is_remote)
value = devlink->stats.reload_stats[stat_idx];
else
value = devlink->stats.remote_reload_stats[stat_idx];
if (devlink_reload_stat_put(msg, j, value))
goto action_stats_nest_cancel;
}
nla_nest_end(msg, act_stats);
nla_nest_end(msg, act_info);
}
nla_nest_end(msg, reload_stats_attr);
return 0;
action_stats_nest_cancel:
nla_nest_cancel(msg, act_stats);
action_info_nest_cancel:
nla_nest_cancel(msg, act_info);
nla_put_failure:
nla_nest_cancel(msg, reload_stats_attr);
return -EMSGSIZE;