This is a note to let you know that I've just added the patch titled
mlxsw: Use refcount_t for reference counting
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mlxsw-use-refcount_t-for-reference-counting.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 499e3c74b6cc811e61beda346a5a8e38666f3bbd
Author: Amit Cohen <amcohen@xxxxxxxxxx>
Date: Fri Jan 26 19:58:31 2024 +0100
mlxsw: Use refcount_t for reference counting
[ Upstream commit 1267f7223bec186dc26ef4e6075496c6217355de ]
mlxsw driver uses 'unsigned int' for reference counters in several
structures. Instead, use refcount_t type which allows us to catch overflow
and underflow issues. Change the type of the counters and use the
appropriate API.
Signed-off-by: Amit Cohen <amcohen@xxxxxxxxxx>
Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>
Signed-off-by: Ido Schimmel <idosch@xxxxxxxxxx>
Signed-off-by: Petr Machata <petrm@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Stable-dep-of: 627f9c1bb882 ("mlxsw: spectrum_acl_tcam: Fix race in region ID allocation")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
index faa63ea9b83e1..1915fa41c6224 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_actions.c
@@ -95,7 +95,7 @@ struct mlxsw_afa_set {
*/
has_trap:1,
has_police:1;
- unsigned int ref_count;
+ refcount_t ref_count;
struct mlxsw_afa_set *next; /* Pointer to the next set. */
struct mlxsw_afa_set *prev; /* Pointer to the previous set,
* note that set may have multiple
@@ -120,7 +120,7 @@ struct mlxsw_afa_fwd_entry {
struct rhash_head ht_node;
struct mlxsw_afa_fwd_entry_ht_key ht_key;
u32 kvdl_index;
- unsigned int ref_count;
+ refcount_t ref_count;
};
static const struct rhashtable_params mlxsw_afa_fwd_entry_ht_params = {
@@ -282,7 +282,7 @@ static struct mlxsw_afa_set *mlxsw_afa_set_create(bool is_first)
/* Need to initialize the set to pass by default */
mlxsw_afa_set_goto_set(set, MLXSW_AFA_SET_GOTO_BINDING_CMD_TERM, 0);
set->ht_key.is_first = is_first;
- set->ref_count = 1;
+ refcount_set(&set->ref_count, 1);
return set;
}
@@ -330,7 +330,7 @@ static void mlxsw_afa_set_unshare(struct mlxsw_afa *mlxsw_afa,
static void mlxsw_afa_set_put(struct mlxsw_afa *mlxsw_afa,
struct mlxsw_afa_set *set)
{
- if (--set->ref_count)
+ if (!refcount_dec_and_test(&set->ref_count))
return;
if (set->shared)
mlxsw_afa_set_unshare(mlxsw_afa, set);
@@ -350,7 +350,7 @@ static struct mlxsw_afa_set *mlxsw_afa_set_get(struct mlxsw_afa *mlxsw_afa,
set = rhashtable_lookup_fast(&mlxsw_afa->set_ht, &orig_set->ht_key,
mlxsw_afa_set_ht_params);
if (set) {
- set->ref_count++;
+ refcount_inc(&set->ref_count);
mlxsw_afa_set_put(mlxsw_afa, orig_set);
} else {
set = orig_set;
@@ -564,7 +564,7 @@ mlxsw_afa_fwd_entry_create(struct mlxsw_afa *mlxsw_afa, u16 local_port)
if (!fwd_entry)
return ERR_PTR(-ENOMEM);
fwd_entry->ht_key.local_port = local_port;
- fwd_entry->ref_count = 1;
+ refcount_set(&fwd_entry->ref_count, 1);
err = rhashtable_insert_fast(&mlxsw_afa->fwd_entry_ht,
&fwd_entry->ht_node,
@@ -607,7 +607,7 @@ mlxsw_afa_fwd_entry_get(struct mlxsw_afa *mlxsw_afa, u16 local_port)
fwd_entry = rhashtable_lookup_fast(&mlxsw_afa->fwd_entry_ht, &ht_key,
mlxsw_afa_fwd_entry_ht_params);
if (fwd_entry) {
- fwd_entry->ref_count++;
+ refcount_inc(&fwd_entry->ref_count);
return fwd_entry;
}
return mlxsw_afa_fwd_entry_create(mlxsw_afa, local_port);
@@ -616,7 +616,7 @@ mlxsw_afa_fwd_entry_get(struct mlxsw_afa *mlxsw_afa, u16 local_port)
static void mlxsw_afa_fwd_entry_put(struct mlxsw_afa *mlxsw_afa,
struct mlxsw_afa_fwd_entry *fwd_entry)
{
- if (--fwd_entry->ref_count)
+ if (!refcount_dec_and_test(&fwd_entry->ref_count))
return;
mlxsw_afa_fwd_entry_destroy(mlxsw_afa, fwd_entry);
}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
index 0d5e6f9b466ec..947500f8ed714 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_acl_flex_keys.c
@@ -5,6 +5,7 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/errno.h>
+#include <linux/refcount.h>
#include "item.h"
#include "core_acl_flex_keys.h"
@@ -107,7 +108,7 @@ EXPORT_SYMBOL(mlxsw_afk_destroy);
struct mlxsw_afk_key_info {
struct list_head list;
- unsigned int ref_count;
+ refcount_t ref_count;
unsigned int blocks_count;
int element_to_block[MLXSW_AFK_ELEMENT_MAX]; /* index is element, value
* is index inside "blocks"
@@ -334,7 +335,7 @@ mlxsw_afk_key_info_create(struct mlxsw_afk *mlxsw_afk,
if (err)
goto err_picker;
list_add(&key_info->list, &mlxsw_afk->key_info_list);
- key_info->ref_count = 1;
+ refcount_set(&key_info->ref_count, 1);
return key_info;
err_picker:
@@ -356,7 +357,7 @@ mlxsw_afk_key_info_get(struct mlxsw_afk *mlxsw_afk,
key_info = mlxsw_afk_key_info_find(mlxsw_afk, elusage);
if (key_info) {
- key_info->ref_count++;
+ refcount_inc(&key_info->ref_count);
return key_info;
}
return mlxsw_afk_key_info_create(mlxsw_afk, elusage);
@@ -365,7 +366,7 @@ EXPORT_SYMBOL(mlxsw_afk_key_info_get);
void mlxsw_afk_key_info_put(struct mlxsw_afk_key_info *key_info)
{
- if (--key_info->ref_count)
+ if (!refcount_dec_and_test(&key_info->ref_count))
return;
mlxsw_afk_key_info_destroy(key_info);
}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
index 7c59c8a135840..b01b000bc71c1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl.c
@@ -9,6 +9,7 @@
#include <linux/rhashtable.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
+#include <linux/refcount.h>
#include <net/net_namespace.h>
#include <net/tc_act/tc_vlan.h>
@@ -55,7 +56,7 @@ struct mlxsw_sp_acl_ruleset {
struct rhash_head ht_node; /* Member of acl HT */
struct mlxsw_sp_acl_ruleset_ht_key ht_key;
struct rhashtable rule_ht;
- unsigned int ref_count;
+ refcount_t ref_count;
unsigned int min_prio;
unsigned int max_prio;
unsigned long priv[];
@@ -99,7 +100,7 @@ static bool
mlxsw_sp_acl_ruleset_is_singular(const struct mlxsw_sp_acl_ruleset *ruleset)
{
/* We hold a reference on ruleset ourselves */
- return ruleset->ref_count == 2;
+ return refcount_read(&ruleset->ref_count) == 2;
}
int mlxsw_sp_acl_ruleset_bind(struct mlxsw_sp *mlxsw_sp,
@@ -176,7 +177,7 @@ mlxsw_sp_acl_ruleset_create(struct mlxsw_sp *mlxsw_sp,
ruleset = kzalloc(alloc_size, GFP_KERNEL);
if (!ruleset)
return ERR_PTR(-ENOMEM);
- ruleset->ref_count = 1;
+ refcount_set(&ruleset->ref_count, 1);
ruleset->ht_key.block = block;
ruleset->ht_key.chain_index = chain_index;
ruleset->ht_key.ops = ops;
@@ -222,13 +223,13 @@ static void mlxsw_sp_acl_ruleset_destroy(struct mlxsw_sp *mlxsw_sp,
static void mlxsw_sp_acl_ruleset_ref_inc(struct mlxsw_sp_acl_ruleset *ruleset)
{
- ruleset->ref_count++;
+ refcount_inc(&ruleset->ref_count);
}
static void mlxsw_sp_acl_ruleset_ref_dec(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_acl_ruleset *ruleset)
{
- if (--ruleset->ref_count)
+ if (!refcount_dec_and_test(&ruleset->ref_count))
return;
mlxsw_sp_acl_ruleset_destroy(mlxsw_sp, ruleset);
}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
index 50ea1eff02b2f..f20052776b3f2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c
@@ -9,6 +9,7 @@
#include <linux/rhashtable.h>
#include <linux/netdevice.h>
#include <linux/mutex.h>
+#include <linux/refcount.h>
#include <net/devlink.h>
#include <trace/events/mlxsw.h>
@@ -155,7 +156,7 @@ struct mlxsw_sp_acl_tcam_vregion {
struct mlxsw_sp_acl_tcam_rehash_ctx ctx;
} rehash;
struct mlxsw_sp *mlxsw_sp;
- unsigned int ref_count;
+ refcount_t ref_count;
};
struct mlxsw_sp_acl_tcam_vchunk;
@@ -176,7 +177,7 @@ struct mlxsw_sp_acl_tcam_vchunk {
unsigned int priority; /* Priority within the vregion and group */
struct mlxsw_sp_acl_tcam_vgroup *vgroup;
struct mlxsw_sp_acl_tcam_vregion *vregion;
- unsigned int ref_count;
+ refcount_t ref_count;
};
struct mlxsw_sp_acl_tcam_entry {
@@ -769,7 +770,7 @@ mlxsw_sp_acl_tcam_vregion_create(struct mlxsw_sp *mlxsw_sp,
vregion->tcam = tcam;
vregion->mlxsw_sp = mlxsw_sp;
vregion->vgroup = vgroup;
- vregion->ref_count = 1;
+ refcount_set(&vregion->ref_count, 1);
vregion->key_info = mlxsw_afk_key_info_get(afk, elusage);
if (IS_ERR(vregion->key_info)) {
@@ -856,7 +857,7 @@ mlxsw_sp_acl_tcam_vregion_get(struct mlxsw_sp *mlxsw_sp,
*/
return ERR_PTR(-EOPNOTSUPP);
}
- vregion->ref_count++;
+ refcount_inc(&vregion->ref_count);
return vregion;
}
@@ -871,7 +872,7 @@ static void
mlxsw_sp_acl_tcam_vregion_put(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_acl_tcam_vregion *vregion)
{
- if (--vregion->ref_count)
+ if (!refcount_dec_and_test(&vregion->ref_count))
return;
mlxsw_sp_acl_tcam_vregion_destroy(mlxsw_sp, vregion);
}
@@ -924,7 +925,7 @@ mlxsw_sp_acl_tcam_vchunk_create(struct mlxsw_sp *mlxsw_sp,
INIT_LIST_HEAD(&vchunk->ventry_list);
vchunk->priority = priority;
vchunk->vgroup = vgroup;
- vchunk->ref_count = 1;
+ refcount_set(&vchunk->ref_count, 1);
vregion = mlxsw_sp_acl_tcam_vregion_get(mlxsw_sp, vgroup,
priority, elusage);
@@ -1008,7 +1009,7 @@ mlxsw_sp_acl_tcam_vchunk_get(struct mlxsw_sp *mlxsw_sp,
if (WARN_ON(!mlxsw_afk_key_info_subset(vchunk->vregion->key_info,
elusage)))
return ERR_PTR(-EINVAL);
- vchunk->ref_count++;
+ refcount_inc(&vchunk->ref_count);
return vchunk;
}
return mlxsw_sp_acl_tcam_vchunk_create(mlxsw_sp, vgroup,
@@ -1019,7 +1020,7 @@ static void
mlxsw_sp_acl_tcam_vchunk_put(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_acl_tcam_vchunk *vchunk)
{
- if (--vchunk->ref_count)
+ if (!refcount_dec_and_test(&vchunk->ref_count))
return;
mlxsw_sp_acl_tcam_vchunk_destroy(mlxsw_sp, vchunk);
}
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 7164f9e6370fb..87617df694ab2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -501,7 +501,7 @@ struct mlxsw_sp_rt6 {
struct mlxsw_sp_lpm_tree {
u8 id; /* tree ID */
- unsigned int ref_count;
+ refcount_t ref_count;
enum mlxsw_sp_l3proto proto;
unsigned long prefix_ref_count[MLXSW_SP_PREFIX_COUNT];
struct mlxsw_sp_prefix_usage prefix_usage;
@@ -578,7 +578,7 @@ mlxsw_sp_lpm_tree_find_unused(struct mlxsw_sp *mlxsw_sp)
for (i = 0; i < mlxsw_sp->router->lpm.tree_count; i++) {
lpm_tree = &mlxsw_sp->router->lpm.trees[i];
- if (lpm_tree->ref_count == 0)
+ if (refcount_read(&lpm_tree->ref_count) == 0)
return lpm_tree;
}
return NULL;
@@ -654,7 +654,7 @@ mlxsw_sp_lpm_tree_create(struct mlxsw_sp *mlxsw_sp,
sizeof(lpm_tree->prefix_usage));
memset(&lpm_tree->prefix_ref_count, 0,
sizeof(lpm_tree->prefix_ref_count));
- lpm_tree->ref_count = 1;
+ refcount_set(&lpm_tree->ref_count, 1);
return lpm_tree;
err_left_struct_set:
@@ -678,7 +678,7 @@ mlxsw_sp_lpm_tree_get(struct mlxsw_sp *mlxsw_sp,
for (i = 0; i < mlxsw_sp->router->lpm.tree_count; i++) {
lpm_tree = &mlxsw_sp->router->lpm.trees[i];
- if (lpm_tree->ref_count != 0 &&
+ if (refcount_read(&lpm_tree->ref_count) &&
lpm_tree->proto == proto &&
mlxsw_sp_prefix_usage_eq(&lpm_tree->prefix_usage,
prefix_usage)) {
@@ -691,14 +691,15 @@ mlxsw_sp_lpm_tree_get(struct mlxsw_sp *mlxsw_sp,
static void mlxsw_sp_lpm_tree_hold(struct mlxsw_sp_lpm_tree *lpm_tree)
{
- lpm_tree->ref_count++;
+ refcount_inc(&lpm_tree->ref_count);
}
static void mlxsw_sp_lpm_tree_put(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_lpm_tree *lpm_tree)
{
- if (--lpm_tree->ref_count == 0)
- mlxsw_sp_lpm_tree_destroy(mlxsw_sp, lpm_tree);
+ if (!refcount_dec_and_test(&lpm_tree->ref_count))
+ return;
+ mlxsw_sp_lpm_tree_destroy(mlxsw_sp, lpm_tree);
}
#define MLXSW_SP_LPM_TREE_MIN 1 /* tree 0 is reserved */
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
index 6c749c148148d..6397ff0dc951c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_switchdev.c
@@ -61,7 +61,7 @@ struct mlxsw_sp_bridge_port {
struct mlxsw_sp_bridge_device *bridge_device;
struct list_head list;
struct list_head vlans_list;
- unsigned int ref_count;
+ refcount_t ref_count;
u8 stp_state;
unsigned long flags;
bool mrouter;
@@ -495,7 +495,7 @@ mlxsw_sp_bridge_port_create(struct mlxsw_sp_bridge_device *bridge_device,
BR_MCAST_FLOOD;
INIT_LIST_HEAD(&bridge_port->vlans_list);
list_add(&bridge_port->list, &bridge_device->ports_list);
- bridge_port->ref_count = 1;
+ refcount_set(&bridge_port->ref_count, 1);
err = switchdev_bridge_port_offload(brport_dev, mlxsw_sp_port->dev,
NULL, NULL, NULL, false, extack);
@@ -531,7 +531,7 @@ mlxsw_sp_bridge_port_get(struct mlxsw_sp_bridge *bridge,
bridge_port = mlxsw_sp_bridge_port_find(bridge, brport_dev);
if (bridge_port) {
- bridge_port->ref_count++;
+ refcount_inc(&bridge_port->ref_count);
return bridge_port;
}
@@ -558,7 +558,7 @@ static void mlxsw_sp_bridge_port_put(struct mlxsw_sp_bridge *bridge,
{
struct mlxsw_sp_bridge_device *bridge_device;
- if (--bridge_port->ref_count != 0)
+ if (!refcount_dec_and_test(&bridge_port->ref_count))
return;
bridge_device = bridge_port->bridge_device;
mlxsw_sp_bridge_port_destroy(bridge_port);
