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devlink: Use xarray to store devlink instances

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We can use xarray instead of linearly organized linked lists for the
devlink instances. This will let us revise the locking scheme in favour
of internal xarray locking that protects database.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Leon Romanovsky 2021-08-14 12:57:29 +03:00 committed by David S. Miller
parent 437ebfd90a
commit 11a861d767
2 changed files with 50 additions and 22 deletions
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2
include/net/devlink.h
View File

@ -32,7 +32,7 @@ struct devlink_dev_stats {
struct devlink_ops;
struct devlink {
struct list_head list;
u32 index;
struct list_head port_list;
struct list_head rate_list;
struct list_head sb_list;

70
net/core/devlink.c
View File

@ -92,7 +92,8 @@ static const struct nla_policy devlink_function_nl_policy[DEVLINK_PORT_FUNCTION_
DEVLINK_PORT_FN_STATE_ACTIVE),
};
static LIST_HEAD(devlink_list);
static DEFINE_XARRAY_FLAGS(devlinks, XA_FLAGS_ALLOC);
#define DEVLINK_REGISTERED XA_MARK_1
/* devlink_mutex
*
@ -123,6 +124,7 @@ static struct devlink *devlink_get_from_attrs(struct net *net,
struct nlattr **attrs)
{
struct devlink *devlink;
unsigned long index;
bool found = false;
char *busname;
char *devname;
@ -135,7 +137,7 @@ static struct devlink *devlink_get_from_attrs(struct net *net,
lockdep_assert_held(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (strcmp(devlink->dev->bus->name, busname) == 0 &&
strcmp(dev_name(devlink->dev), devname) == 0 &&
net_eq(devlink_net(devlink), net)) {
@ -1087,11 +1089,12 @@ static int devlink_nl_cmd_rate_get_dumpit(struct sk_buff *msg,
struct devlink_rate *devlink_rate;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -1189,11 +1192,12 @@ static int devlink_nl_cmd_get_dumpit(struct sk_buff *msg,
{
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -1251,11 +1255,12 @@ static int devlink_nl_cmd_port_get_dumpit(struct sk_buff *msg,
struct devlink *devlink;
struct devlink_port *devlink_port;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -1916,11 +1921,12 @@ static int devlink_nl_cmd_sb_get_dumpit(struct sk_buff *msg,
struct devlink *devlink;
struct devlink_sb *devlink_sb;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -2067,11 +2073,12 @@ static int devlink_nl_cmd_sb_pool_get_dumpit(struct sk_buff *msg,
struct devlink *devlink;
struct devlink_sb *devlink_sb;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -2287,11 +2294,12 @@ static int devlink_nl_cmd_sb_port_pool_get_dumpit(struct sk_buff *msg,
struct devlink *devlink;
struct devlink_sb *devlink_sb;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -2535,11 +2543,12 @@ devlink_nl_cmd_sb_tc_pool_bind_get_dumpit(struct sk_buff *msg,
struct devlink *devlink;
struct devlink_sb *devlink_sb;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -4611,11 +4620,12 @@ static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
struct devlink_param_item *param_item;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -4886,11 +4896,12 @@ static int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
struct devlink_port *devlink_port;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -5462,11 +5473,12 @@ static int devlink_nl_cmd_region_get_dumpit(struct sk_buff *msg,
{
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -5995,11 +6007,12 @@ static int devlink_nl_cmd_info_get_dumpit(struct sk_buff *msg,
{
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err = 0;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -7176,11 +7189,12 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
struct devlink_port *port;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -7210,7 +7224,7 @@ retry_rep:
devlink_put(devlink);
}
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -7771,11 +7785,12 @@ static int devlink_nl_cmd_trap_get_dumpit(struct sk_buff *msg,
struct devlink_trap_item *trap_item;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -7997,11 +8012,12 @@ static int devlink_nl_cmd_trap_group_get_dumpit(struct sk_buff *msg,
u32 portid = NETLINK_CB(cb->skb).portid;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -8310,11 +8326,12 @@ static int devlink_nl_cmd_trap_policer_get_dumpit(struct sk_buff *msg,
u32 portid = NETLINK_CB(cb->skb).portid;
struct devlink *devlink;
int start = cb->args[0];
unsigned long index;
int idx = 0;
int err;
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;
@ -8899,6 +8916,8 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
struct device *dev)
{
struct devlink *devlink;
static u32 last_id;
int ret;
WARN_ON(!ops || !dev);
if (!devlink_reload_actions_valid(ops))
@ -8908,6 +8927,13 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
if (!devlink)
return NULL;
ret = xa_alloc_cyclic(&devlinks, &devlink->index, devlink, xa_limit_31b,
&last_id, GFP_KERNEL);
if (ret < 0) {
kfree(devlink);
return NULL;
}
devlink->dev = dev;
devlink->ops = ops;
xa_init_flags(&devlink->snapshot_ids, XA_FLAGS_ALLOC);
@ -8940,7 +8966,7 @@ EXPORT_SYMBOL_GPL(devlink_alloc_ns);
int devlink_register(struct devlink *devlink)
{
mutex_lock(&devlink_mutex);
list_add_tail(&devlink->list, &devlink_list);
xa_set_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
devlink_notify(devlink, DEVLINK_CMD_NEW);
mutex_unlock(&devlink_mutex);
return 0;
@ -8961,7 +8987,7 @@ void devlink_unregister(struct devlink *devlink)
WARN_ON(devlink_reload_supported(devlink->ops) &&
devlink->reload_enabled);
devlink_notify(devlink, DEVLINK_CMD_DEL);
list_del(&devlink->list);
xa_clear_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
mutex_unlock(&devlink_mutex);
}
EXPORT_SYMBOL_GPL(devlink_unregister);
@ -9023,6 +9049,7 @@ void devlink_free(struct devlink *devlink)
WARN_ON(!list_empty(&devlink->port_list));
xa_destroy(&devlink->snapshot_ids);
xa_erase(&devlinks, devlink->index);
kfree(devlink);
}
@ -11497,13 +11524,14 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
{
struct devlink *devlink;
u32 actions_performed;
unsigned long index;
int err;
/* In case network namespace is getting destroyed, reload
* all devlink instances from this namespace into init_net.
*/
mutex_lock(&devlink_mutex);
list_for_each_entry(devlink, &devlink_list, list) {
xa_for_each_marked(&devlinks, index, devlink, DEVLINK_REGISTERED) {
if (!devlink_try_get(devlink))
continue;