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devlink: Stop reference counting packet trap groups

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Now that drivers explicitly register their supported packet trap groups
there is no for devlink to create them on-demand and destroy them when
their reference count reaches zero.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2020-03-22 20:48:29 +02:00 committed by David S. Miller
parent b29545d840
commit a09b37fc8b
1 changed files with 5 additions and 96 deletions
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101
net/core/devlink.c
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@ -5456,16 +5456,14 @@ struct devlink_stats {
/**
* struct devlink_trap_group_item - Packet trap group attributes.
* @group: Immutable packet trap group attributes.
* @refcount: Number of trap items using the group.
* @list: trap_group_list member.
* @stats: Trap group statistics.
*
* Describes packet trap group attributes. Created by devlink during trap
* registration.
* group registration.
*/
struct devlink_trap_group_item {
const struct devlink_trap_group *group;
refcount_t refcount;
struct list_head list;
struct devlink_stats __percpu *stats;
};
@ -7937,108 +7935,22 @@ devlink_trap_group_notify(struct devlink *devlink,
msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
}
static struct devlink_trap_group_item *
devlink_trap_group_item_create(struct devlink *devlink,
const struct devlink_trap_group *group)
{
struct devlink_trap_group_item *group_item;
int err;
err = devlink_trap_group_verify(group);
if (err)
return ERR_PTR(err);
group_item = kzalloc(sizeof(*group_item), GFP_KERNEL);
if (!group_item)
return ERR_PTR(-ENOMEM);
group_item->stats = netdev_alloc_pcpu_stats(struct devlink_stats);
if (!group_item->stats) {
err = -ENOMEM;
goto err_stats_alloc;
}
group_item->group = group;
refcount_set(&group_item->refcount, 1);
if (devlink->ops->trap_group_init) {
err = devlink->ops->trap_group_init(devlink, group);
if (err)
goto err_group_init;
}
list_add_tail(&group_item->list, &devlink->trap_group_list);
devlink_trap_group_notify(devlink, group_item,
DEVLINK_CMD_TRAP_GROUP_NEW);
return group_item;
err_group_init:
free_percpu(group_item->stats);
err_stats_alloc:
kfree(group_item);
return ERR_PTR(err);
}
static void
devlink_trap_group_item_destroy(struct devlink *devlink,
struct devlink_trap_group_item *group_item)
{
devlink_trap_group_notify(devlink, group_item,
DEVLINK_CMD_TRAP_GROUP_DEL);
list_del(&group_item->list);
free_percpu(group_item->stats);
kfree(group_item);
}
static struct devlink_trap_group_item *
devlink_trap_group_item_get(struct devlink *devlink,
const struct devlink_trap_group *group)
{
struct devlink_trap_group_item *group_item;
group_item = devlink_trap_group_item_lookup(devlink, group->name);
if (group_item) {
refcount_inc(&group_item->refcount);
return group_item;
}
return devlink_trap_group_item_create(devlink, group);
}
static void
devlink_trap_group_item_put(struct devlink *devlink,
struct devlink_trap_group_item *group_item)
{
if (!refcount_dec_and_test(&group_item->refcount))
return;
devlink_trap_group_item_destroy(devlink, group_item);
}
static int
devlink_trap_item_group_link(struct devlink *devlink,
struct devlink_trap_item *trap_item)
{
const struct devlink_trap *trap = trap_item->trap;
struct devlink_trap_group_item *group_item;
group_item = devlink_trap_group_item_get(devlink,
&trap_item->trap->group);
if (IS_ERR(group_item))
return PTR_ERR(group_item);
group_item = devlink_trap_group_item_lookup(devlink, trap->group.name);
if (WARN_ON_ONCE(!group_item))
return -EINVAL;
trap_item->group_item = group_item;
return 0;
}
static void
devlink_trap_item_group_unlink(struct devlink *devlink,
struct devlink_trap_item *trap_item)
{
devlink_trap_group_item_put(devlink, trap_item->group_item);
}
static void devlink_trap_notify(struct devlink *devlink,
const struct devlink_trap_item *trap_item,
enum devlink_command cmd)
@ -8101,7 +8013,6 @@ devlink_trap_register(struct devlink *devlink,
return 0;
err_trap_init:
devlink_trap_item_group_unlink(devlink, trap_item);
err_group_link:
free_percpu(trap_item->stats);
err_stats_alloc:
@ -8122,7 +8033,6 @@ static void devlink_trap_unregister(struct devlink *devlink,
list_del(&trap_item->list);
if (devlink->ops->trap_fini)
devlink->ops->trap_fini(devlink, trap, trap_item);
devlink_trap_item_group_unlink(devlink, trap_item);
free_percpu(trap_item->stats);
kfree(trap_item);
}
@ -8299,7 +8209,6 @@ devlink_trap_group_register(struct devlink *devlink,
}
group_item->group = group;
refcount_set(&group_item->refcount, 1);
if (devlink->ops->trap_group_init) {
err = devlink->ops->trap_group_init(devlink, group);