[patch net-next v2 0/9] devlink: features, linecard and reporters locking cleanup

[patch net-next v2 0/9] devlink: features, linecard and reporters locking cleanup

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

This patchset does not change functionality.

In the first patch, no longer needed devlink features are removed.

Patches 2-5 removes linecards and reporters locks and reference counting,
converting them to be protected by devlink instance lock as the rest of
the objects.

Patches 6 and 7 convert linecards and reporters dumpit callbacks to
recently introduced devlink_nl_instance_iter_dump() infra.
Patch 8 removes no longer needed devlink_dump_for_each_instance_get()
helper.

The last patch adds assertion to devl_is_registered() as dependency on
other locks is removed.

---
v1->v2:
- patch 7 bits were unsquashed to patch 8.

Jiri Pirko (9):
  devlink: remove devlink features
  devlink: remove linecards lock
  devlink: remove linecard reference counting
  devlink: remove reporters_lock
  devlink: remove reporter reference counting
  devlink: convert linecards dump to devlink_nl_instance_iter_dump()
  devlink: convert reporters dump to devlink_nl_instance_iter_dump()
  devlink: remove devlink_dump_for_each_instance_get() helper
  devlink: add instance lock assertion in devl_is_registered()

 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |   1 -
 .../hisilicon/hns3/hns3pf/hclge_devlink.c     |   1 -
 .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |   1 -
 drivers/net/ethernet/intel/ice/ice_devlink.c  |   1 -
 drivers/net/ethernet/mellanox/mlx4/main.c     |   1 -
 .../net/ethernet/mellanox/mlx5/core/devlink.c |   9 +-
 .../ethernet/mellanox/mlx5/core/en/health.c   |  12 +
 .../mellanox/mlx5/core/en/reporter_rx.c       |   6 +-
 .../mellanox/mlx5/core/en/reporter_tx.c       |   6 +-
 drivers/net/ethernet/mellanox/mlxsw/core.c    |   9 +-
 .../ethernet/mellanox/mlxsw/core_linecards.c  |   8 +-
 drivers/net/netdevsim/dev.c                   |   1 -
 drivers/net/netdevsim/health.c                |  20 +-
 include/net/devlink.h                         |  26 +-
 net/devlink/core.c                            |  23 -
 net/devlink/devl_internal.h                   |  20 +-
 net/devlink/leftover.c                        | 431 +++++++-----------
 net/devlink/netlink.c                         |  12 +-
 18 files changed, 218 insertions(+), 370 deletions(-)

-- 
2.39.0

[patch net-next v2 1/9] devlink: remove devlink features

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

Devlink features were introduced to disallow devlink reload calls of
userspace before the devlink was fully initialized. The reason for this
workaround was the fact that devlink reload was originally called
without devlink instance lock held.

However, with recent changes that converted devlink reload to be
performed under devlink instance lock, this is redundant so remove
devlink features entirely.

Note that mlx5 used this to enable devlink reload conditionally only
when device didn't act as multi port slave. Move the multi port check
into mlx5_devlink_reload_down() callback alongside with the other
checks preventing the device from reload in certain states.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  1 -
 .../hisilicon/hns3/hns3pf/hclge_devlink.c     |  1 -
 .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |  1 -
 drivers/net/ethernet/intel/ice/ice_devlink.c  |  1 -
 drivers/net/ethernet/mellanox/mlx4/main.c     |  1 -
 .../net/ethernet/mellanox/mlx5/core/devlink.c |  9 +++++----
 drivers/net/ethernet/mellanox/mlxsw/core.c    |  1 -
 drivers/net/netdevsim/dev.c                   |  1 -
 net/devlink/core.c                            | 19 -------------------
 net/devlink/devl_internal.h                   |  1 -
 net/devlink/leftover.c                        |  3 ---
 11 files changed, 5 insertions(+), 34 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 26913dc816d3..8b3e7697390f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -1303,7 +1303,6 @@ int bnxt_dl_register(struct bnxt *bp)
 	if (rc)
 		goto err_dl_port_unreg;
 
-	devlink_set_features(dl, DEVLINK_F_RELOAD);
 out:
 	devlink_register(dl);
 	return 0;
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
index 3d3b69605423..9a939c0b217f 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
@@ -114,7 +114,6 @@ int hclge_devlink_init(struct hclge_dev *hdev)
 	priv->hdev = hdev;
 	hdev->devlink = devlink;
 
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devlink_register(devlink);
 	return 0;
 }
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
index a6c3c5e8f0ab..1b535142c65a 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
@@ -116,7 +116,6 @@ int hclgevf_devlink_init(struct hclgevf_dev *hdev)
 	priv->hdev = hdev;
 	hdev->devlink = devlink;
 
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devlink_register(devlink);
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
index 8286e47b4bae..026f65a4e4ca 100644
--- a/drivers/net/ethernet/intel/ice/ice_devlink.c
+++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
@@ -1376,7 +1376,6 @@ void ice_devlink_register(struct ice_pf *pf)
 {
 	struct devlink *devlink = priv_to_devlink(pf);
 
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devlink_register(devlink);
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 3ae246391549..5e7736be2091 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -4031,7 +4031,6 @@ static int mlx4_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_params_unregister;
 
 	pci_save_state(pdev);
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devl_unlock(devlink);
 	devlink_register(devlink);
 	return 0;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index 5bd83c0275f8..67bc3ade273a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -156,6 +156,11 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
 		return -EOPNOTSUPP;
 	}
 
+	if (mlx5_core_is_mp_slave(dev)) {
+		NL_SET_ERR_MSG_MOD(extack, "reload is unsupported for multi port slave");
+		return -EOPNOTSUPP;
+	}
+
 	if (pci_num_vf(pdev)) {
 		NL_SET_ERR_MSG_MOD(extack, "reload while VFs are present is unfavorable");
 	}
@@ -871,7 +876,6 @@ void mlx5_devlink_traps_unregister(struct devlink *devlink)
 
 int mlx5_devlink_register(struct devlink *devlink)
 {
-	struct mlx5_core_dev *dev = devlink_priv(devlink);
 	int err;
 
 	err = devlink_params_register(devlink, mlx5_devlink_params,
@@ -889,9 +893,6 @@ int mlx5_devlink_register(struct devlink *devlink)
 	if (err)
 		goto max_uc_list_err;
 
-	if (!mlx5_core_is_mp_slave(dev))
-		devlink_set_features(devlink, DEVLINK_F_RELOAD);
-
 	return 0;
 
 max_uc_list_err:
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index a0a06e2eff82..0b791706a9c1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2211,7 +2211,6 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	}
 
 	if (!reload) {
-		devlink_set_features(devlink, DEVLINK_F_RELOAD);
 		devl_unlock(devlink);
 		devlink_register(devlink);
 	}
diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 738784fda117..35a0fb683801 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -1609,7 +1609,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 		goto err_hwstats_exit;
 
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
-	devlink_set_features(devlink, DEVLINK_F_RELOAD);
 	devl_unlock(devlink);
 	return 0;
 
diff --git a/net/devlink/core.c b/net/devlink/core.c
index a31a317626d7..4014a01c8f3d 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c
@@ -114,23 +114,6 @@ struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp)
 	goto retry;
 }
 
-/**
- *	devlink_set_features - Set devlink supported features
- *
- *	@devlink: devlink
- *	@features: devlink support features
- *
- *	This interface allows us to set reload ops separatelly from
- *	the devlink_alloc.
- */
-void devlink_set_features(struct devlink *devlink, u64 features)
-{
-	WARN_ON(features & DEVLINK_F_RELOAD &&
-		!devlink_reload_supported(devlink->ops));
-	devlink->features = features;
-}
-EXPORT_SYMBOL_GPL(devlink_set_features);
-
 /**
  * devl_register - Register devlink instance
  * @devlink: devlink
@@ -297,7 +280,6 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
 	 * all devlink instances from this namespace into init_net.
 	 */
 	devlinks_xa_for_each_registered_get(net, index, devlink) {
-		WARN_ON(!(devlink->features & DEVLINK_F_RELOAD));
 		devl_lock(devlink);
 		err = 0;
 		if (devl_is_registered(devlink))
@@ -307,7 +289,6 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
 					     &actions_performed, NULL);
 		devl_unlock(devlink);
 		devlink_put(devlink);
-
 		if (err && err != -EOPNOTSUPP)
 			pr_warn("Failed to reload devlink instance into init_net\n");
 	}
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 5d2bbe295659..82268c4579a3 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -39,7 +39,6 @@ struct devlink {
 	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;
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 1e23b2da78cc..478b81b85f03 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -4429,9 +4429,6 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
 	u32 actions_performed;
 	int err;
 
-	if (!(devlink->features & DEVLINK_F_RELOAD))
-		return -EOPNOTSUPP;
-
 	err = devlink_resources_validate(devlink, NULL, info);
 	if (err) {
 		NL_SET_ERR_MSG_MOD(info->extack, "resources size validation failed");
-- 
2.39.0

Re: [patch net-next v2 1/9] devlink: remove devlink features

[Ido Schimmel]

On Sat, Jan 07, 2023 at 11:11:42AM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> Devlink features were introduced to disallow devlink reload calls of
> userspace before the devlink was fully initialized. The reason for this
> workaround was the fact that devlink reload was originally called
> without devlink instance lock held.
> 
> However, with recent changes that converted devlink reload to be
> performed under devlink instance lock, this is redundant so remove
> devlink features entirely.
> 
> Note that mlx5 used this to enable devlink reload conditionally only
> when device didn't act as multi port slave. Move the multi port check
> into mlx5_devlink_reload_down() callback alongside with the other
> checks preventing the device from reload in certain states.
> 
> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
> ---
>  .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  1 -
>  .../hisilicon/hns3/hns3pf/hclge_devlink.c     |  1 -
>  .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |  1 -
>  drivers/net/ethernet/intel/ice/ice_devlink.c  |  1 -
>  drivers/net/ethernet/mellanox/mlx4/main.c     |  1 -
>  .../net/ethernet/mellanox/mlx5/core/devlink.c |  9 +++++----
>  drivers/net/ethernet/mellanox/mlxsw/core.c    |  1 -
>  drivers/net/netdevsim/dev.c                   |  1 -
>  net/devlink/core.c                            | 19 -------------------
>  net/devlink/devl_internal.h                   |  1 -
>  net/devlink/leftover.c                        |  3 ---
>  11 files changed, 5 insertions(+), 34 deletions(-)

devlink_set_features() needs to be removed from include/net/devlink.h as
well

Re: [patch net-next v2 1/9] devlink: remove devlink features

[Jiri Pirko]

Sun, Jan 08, 2023 at 04:32:12PM CET, idosch@nvidia.com wrote:
>On Sat, Jan 07, 2023 at 11:11:42AM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@nvidia.com>
>> 
>> Devlink features were introduced to disallow devlink reload calls of
>> userspace before the devlink was fully initialized. The reason for this
>> workaround was the fact that devlink reload was originally called
>> without devlink instance lock held.
>> 
>> However, with recent changes that converted devlink reload to be
>> performed under devlink instance lock, this is redundant so remove
>> devlink features entirely.
>> 
>> Note that mlx5 used this to enable devlink reload conditionally only
>> when device didn't act as multi port slave. Move the multi port check
>> into mlx5_devlink_reload_down() callback alongside with the other
>> checks preventing the device from reload in certain states.
>> 
>> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
>> ---
>>  .../net/ethernet/broadcom/bnxt/bnxt_devlink.c |  1 -
>>  .../hisilicon/hns3/hns3pf/hclge_devlink.c     |  1 -
>>  .../hisilicon/hns3/hns3vf/hclgevf_devlink.c   |  1 -
>>  drivers/net/ethernet/intel/ice/ice_devlink.c  |  1 -
>>  drivers/net/ethernet/mellanox/mlx4/main.c     |  1 -
>>  .../net/ethernet/mellanox/mlx5/core/devlink.c |  9 +++++----
>>  drivers/net/ethernet/mellanox/mlxsw/core.c    |  1 -
>>  drivers/net/netdevsim/dev.c                   |  1 -
>>  net/devlink/core.c                            | 19 -------------------
>>  net/devlink/devl_internal.h                   |  1 -
>>  net/devlink/leftover.c                        |  3 ---
>>  11 files changed, 5 insertions(+), 34 deletions(-)
>
>devlink_set_features() needs to be removed from include/net/devlink.h as
>well

Missed this. Fixed.

[patch net-next v2 2/9] devlink: remove linecards lock

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

Similar to other devlink objects, convert the linecards list to be
protected by devlink instance lock. Alongside with that rename the
create/destroy() functions to devl_* to indicated the devlink instance
lock needs to be held while calling them.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 .../ethernet/mellanox/mlxsw/core_linecards.c  |  8 ++--
 include/net/devlink.h                         |  6 +--
 net/devlink/core.c                            |  2 -
 net/devlink/devl_internal.h                   |  1 -
 net/devlink/leftover.c                        | 41 +++++++------------
 5 files changed, 21 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c b/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
index 83d2dc91ba2c..025e0db983fe 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_linecards.c
@@ -1259,9 +1259,9 @@ static int mlxsw_linecard_init(struct mlxsw_core *mlxsw_core,
 	linecard->linecards = linecards;
 	mutex_init(&linecard->lock);
 
-	devlink_linecard = devlink_linecard_create(priv_to_devlink(mlxsw_core),
-						   slot_index, &mlxsw_linecard_ops,
-						   linecard);
+	devlink_linecard = devl_linecard_create(priv_to_devlink(mlxsw_core),
+						slot_index, &mlxsw_linecard_ops,
+						linecard);
 	if (IS_ERR(devlink_linecard))
 		return PTR_ERR(devlink_linecard);
 
@@ -1285,7 +1285,7 @@ static void mlxsw_linecard_fini(struct mlxsw_core *mlxsw_core,
 	if (linecard->active)
 		mlxsw_linecard_active_clear(linecard);
 	mlxsw_linecard_bdev_del(linecard);
-	devlink_linecard_destroy(linecard->devlink_linecard);
+	devl_linecard_destroy(linecard->devlink_linecard);
 	mutex_destroy(&linecard->lock);
 }
 
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 425ecef431b7..d7c9572e5bea 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -1687,9 +1687,9 @@ void devl_rate_nodes_destroy(struct devlink *devlink);
 void devlink_port_linecard_set(struct devlink_port *devlink_port,
 			       struct devlink_linecard *linecard);
 struct devlink_linecard *
-devlink_linecard_create(struct devlink *devlink, unsigned int linecard_index,
-			const struct devlink_linecard_ops *ops, void *priv);
-void devlink_linecard_destroy(struct devlink_linecard *linecard);
+devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
+		     const struct devlink_linecard_ops *ops, void *priv);
+void devl_linecard_destroy(struct devlink_linecard *linecard);
 void devlink_linecard_provision_set(struct devlink_linecard *linecard,
 				    const char *type);
 void devlink_linecard_provision_clear(struct devlink_linecard *linecard);
diff --git a/net/devlink/core.c b/net/devlink/core.c
index 4014a01c8f3d..d223a46fe557 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c
@@ -218,7 +218,6 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 	mutex_init(&devlink->lock);
 	lockdep_set_class(&devlink->lock, &devlink->lock_key);
 	mutex_init(&devlink->reporters_lock);
-	mutex_init(&devlink->linecards_lock);
 	refcount_set(&devlink->refcount, 1);
 
 	return devlink;
@@ -240,7 +239,6 @@ void devlink_free(struct devlink *devlink)
 {
 	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
 
-	mutex_destroy(&devlink->linecards_lock);
 	mutex_destroy(&devlink->reporters_lock);
 	mutex_destroy(&devlink->lock);
 	lockdep_unregister_key(&devlink->lock_key);
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 82268c4579a3..ca49ad31027c 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -37,7 +37,6 @@ struct devlink {
 	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;
 	struct xarray snapshot_ids;
 	struct devlink_dev_stats stats;
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 478b81b85f03..4b01b15f8659 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -282,13 +282,10 @@ devlink_linecard_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
 		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);
+		refcount_inc(&linecard->refcount);
 		return linecard;
 	}
 	return ERR_PTR(-EINVAL);
@@ -2129,7 +2126,7 @@ static int devlink_nl_cmd_linecard_get_dumpit(struct sk_buff *msg,
 	devlink_dump_for_each_instance_get(msg, state, devlink) {
 		int idx = 0;
 
-		mutex_lock(&devlink->linecards_lock);
+		devl_lock(devlink);
 		if (!devl_is_registered(devlink))
 			goto next_devlink;
 
@@ -2147,7 +2144,7 @@ static int devlink_nl_cmd_linecard_get_dumpit(struct sk_buff *msg,
 						       cb->extack);
 			mutex_unlock(&linecard->state_lock);
 			if (err) {
-				mutex_unlock(&devlink->linecards_lock);
+				devl_unlock(devlink);
 				devlink_put(devlink);
 				state->idx = idx;
 				goto out;
@@ -2155,7 +2152,7 @@ static int devlink_nl_cmd_linecard_get_dumpit(struct sk_buff *msg,
 			idx++;
 		}
 next_devlink:
-		mutex_unlock(&devlink->linecards_lock);
+		devl_unlock(devlink);
 		devlink_put(devlink);
 	}
 out:
@@ -10225,7 +10222,7 @@ static void devlink_linecard_types_fini(struct devlink_linecard *linecard)
 }
 
 /**
- *	devlink_linecard_create - Create devlink linecard
+ *	devl_linecard_create - Create devlink linecard
  *
  *	@devlink: devlink
  *	@linecard_index: driver-specific numerical identifier of the linecard
@@ -10238,8 +10235,8 @@ static void devlink_linecard_types_fini(struct devlink_linecard *linecard)
  *	Return: Line card structure or an ERR_PTR() encoded error code.
  */
 struct devlink_linecard *
-devlink_linecard_create(struct devlink *devlink, unsigned int linecard_index,
-			const struct devlink_linecard_ops *ops, void *priv)
+devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
+		     const struct devlink_linecard_ops *ops, void *priv)
 {
 	struct devlink_linecard *linecard;
 	int err;
@@ -10248,17 +10245,13 @@ devlink_linecard_create(struct devlink *devlink, unsigned int linecard_index,
 		    !ops->types_count || !ops->types_get))
 		return ERR_PTR(-EINVAL);
 
-	mutex_lock(&devlink->linecards_lock);
-	if (devlink_linecard_index_exists(devlink, linecard_index)) {
-		mutex_unlock(&devlink->linecards_lock);
+	if (devlink_linecard_index_exists(devlink, linecard_index))
 		return ERR_PTR(-EEXIST);
-	}
+
 
 	linecard = kzalloc(sizeof(*linecard), GFP_KERNEL);
-	if (!linecard) {
-		mutex_unlock(&devlink->linecards_lock);
+	if (!linecard)
 		return ERR_PTR(-ENOMEM);
-	}
 
 	linecard->devlink = devlink;
 	linecard->index = linecard_index;
@@ -10271,35 +10264,29 @@ devlink_linecard_create(struct devlink *devlink, unsigned int linecard_index,
 	if (err) {
 		mutex_destroy(&linecard->state_lock);
 		kfree(linecard);
-		mutex_unlock(&devlink->linecards_lock);
 		return ERR_PTR(err);
 	}
 
 	list_add_tail(&linecard->list, &devlink->linecard_list);
 	refcount_set(&linecard->refcount, 1);
-	mutex_unlock(&devlink->linecards_lock);
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	return linecard;
 }
-EXPORT_SYMBOL_GPL(devlink_linecard_create);
+EXPORT_SYMBOL_GPL(devl_linecard_create);
 
 /**
- *	devlink_linecard_destroy - Destroy devlink linecard
+ *	devl_linecard_destroy - Destroy devlink linecard
  *
  *	@linecard: devlink linecard
  */
-void devlink_linecard_destroy(struct devlink_linecard *linecard)
+void devl_linecard_destroy(struct devlink_linecard *linecard)
 {
-	struct devlink *devlink = linecard->devlink;
-
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
-	mutex_lock(&devlink->linecards_lock);
 	list_del(&linecard->list);
 	devlink_linecard_types_fini(linecard);
-	mutex_unlock(&devlink->linecards_lock);
 	devlink_linecard_put(linecard);
 }
-EXPORT_SYMBOL_GPL(devlink_linecard_destroy);
+EXPORT_SYMBOL_GPL(devl_linecard_destroy);
 
 /**
  *	devlink_linecard_provision_set - Set provisioning on linecard
-- 
2.39.0

Re: [patch net-next v2 2/9] devlink: remove linecards lock

[Ido Schimmel]

On Sat, Jan 07, 2023 at 11:11:43AM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> Similar to other devlink objects, convert the linecards list to be
> protected by devlink instance lock. Alongside with that rename the
> create/destroy() functions to devl_* to indicated the devlink instance

s/indicated/indicate/

> lock needs to be held while calling them.
> 
> Signed-off-by: Jiri Pirko <jiri@nvidia.com>

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

Re: [patch net-next v2 2/9] devlink: remove linecards lock

[Jiri Pirko]

Sun, Jan 08, 2023 at 04:42:45PM CET, idosch@nvidia.com wrote:
>On Sat, Jan 07, 2023 at 11:11:43AM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@nvidia.com>
>> 
>> Similar to other devlink objects, convert the linecards list to be
>> protected by devlink instance lock. Alongside with that rename the
>> create/destroy() functions to devl_* to indicated the devlink instance
>
>s/indicated/indicate/
>
>> lock needs to be held while calling them.
>> 
>> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
>
>Reviewed-by: Ido Schimmel <idosch@nvidia.com>

Thanks.

[patch net-next v2 3/9] devlink: remove linecard reference counting

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

As long as the linecard live time is protected by devlink instance
lock, the reference counting is no longer needed. Remove it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 net/devlink/leftover.c | 14 ++------------
 net/devlink/netlink.c  |  5 -----
 2 files changed, 2 insertions(+), 17 deletions(-)

diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 4b01b15f8659..2208711b4b18 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -37,7 +37,6 @@ 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;
@@ -285,7 +284,6 @@ devlink_linecard_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
 		linecard = devlink_linecard_get_by_index(devlink, linecard_index);
 		if (!linecard)
 			return ERR_PTR(-ENODEV);
-		refcount_inc(&linecard->refcount);
 		return linecard;
 	}
 	return ERR_PTR(-EINVAL);
@@ -297,14 +295,6 @@ devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info)
 	return devlink_linecard_get_from_attrs(devlink, info->attrs);
 }
 
-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;
@@ -10268,7 +10258,6 @@ devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
 	}
 
 	list_add_tail(&linecard->list, &devlink->linecard_list);
-	refcount_set(&linecard->refcount, 1);
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	return linecard;
 }
@@ -10284,7 +10273,8 @@ void devl_linecard_destroy(struct devlink_linecard *linecard)
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
 	list_del(&linecard->list);
 	devlink_linecard_types_fini(linecard);
-	devlink_linecard_put(linecard);
+	mutex_destroy(&linecard->state_lock);
+	kfree(linecard);
 }
 EXPORT_SYMBOL_GPL(devl_linecard_destroy);
 
diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index b5b8ac6db2d1..3f2ab4360f11 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -170,14 +170,9 @@ static int devlink_nl_pre_doit(const struct genl_split_ops *ops,
 static void devlink_nl_post_doit(const struct genl_split_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);
 }
-- 
2.39.0

Re: [patch net-next v2 3/9] devlink: remove linecard reference counting

[Ido Schimmel]

On Sat, Jan 07, 2023 at 11:11:44AM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> As long as the linecard live time is protected by devlink instance

s/live/life/

> lock, the reference counting is no longer needed. Remove it.
> 
> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
> ---
>  net/devlink/leftover.c | 14 ++------------
>  net/devlink/netlink.c  |  5 -----
>  2 files changed, 2 insertions(+), 17 deletions(-)

devlink_linecard_put() needs to be removed from
net/devlink/devl_internal.h

Re: [patch net-next v2 3/9] devlink: remove linecard reference counting

[Jiri Pirko]

Sun, Jan 08, 2023 at 04:50:36PM CET, idosch@nvidia.com wrote:
>On Sat, Jan 07, 2023 at 11:11:44AM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@nvidia.com>
>> 
>> As long as the linecard live time is protected by devlink instance
>
>s/live/life/
>
>> lock, the reference counting is no longer needed. Remove it.
>> 
>> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
>> ---
>>  net/devlink/leftover.c | 14 ++------------
>>  net/devlink/netlink.c  |  5 -----
>>  2 files changed, 2 insertions(+), 17 deletions(-)
>
>devlink_linecard_put() needs to be removed from
>net/devlink/devl_internal.h

Missed this. Fixed.

[patch net-next v2 4/9] devlink: remove reporters_lock

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

Similar to other devlink objects, convert the reporters list to be
protected by devlink instance lock. Alongside add unlocked versions
of health reporter create functions and remove port-specific destroy
function which is no longer needed.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 .../ethernet/mellanox/mlx5/core/en/health.c   |  12 ++
 .../mellanox/mlx5/core/en/reporter_rx.c       |   6 +-
 .../mellanox/mlx5/core/en/reporter_tx.c       |   6 +-
 drivers/net/ethernet/mellanox/mlxsw/core.c    |   8 +-
 drivers/net/netdevsim/health.c                |  20 +--
 include/net/devlink.h                         |  20 +--
 net/devlink/core.c                            |   2 -
 net/devlink/devl_internal.h                   |   1 -
 net/devlink/leftover.c                        | 131 +++++++-----------
 9 files changed, 96 insertions(+), 110 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
index 6f4e6c34b2a2..acc4b1ebdfb8 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/health.c
@@ -137,14 +137,26 @@ int mlx5e_health_eq_diag_fmsg(struct mlx5_eq_comp *eq, struct devlink_fmsg *fmsg
 
 void mlx5e_health_create_reporters(struct mlx5e_priv *priv)
 {
+	struct devlink *devlink = priv_to_devlink(priv->mdev);
+
+	if (!(priv->mdev->priv.flags & MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW))
+		devl_lock(devlink);
 	mlx5e_reporter_tx_create(priv);
 	mlx5e_reporter_rx_create(priv);
+	if (!(priv->mdev->priv.flags & MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW))
+		devl_unlock(devlink);
 }
 
 void mlx5e_health_destroy_reporters(struct mlx5e_priv *priv)
 {
+	struct devlink *devlink = priv_to_devlink(priv->mdev);
+
+	if (!(priv->mdev->priv.flags & MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW))
+		devl_lock(devlink);
 	mlx5e_reporter_rx_destroy(priv);
 	mlx5e_reporter_tx_destroy(priv);
+	if (!(priv->mdev->priv.flags & MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW))
+		devl_unlock(devlink);
 }
 
 void mlx5e_health_channels_update(struct mlx5e_priv *priv)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
index 1ae15b8536a8..662df2c21747 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c
@@ -739,8 +739,8 @@ void mlx5e_reporter_rx_create(struct mlx5e_priv *priv)
 	struct devlink_port *dl_port = mlx5e_devlink_get_dl_port(priv);
 	struct devlink_health_reporter *reporter;
 
-	reporter = devlink_port_health_reporter_create(dl_port, &mlx5_rx_reporter_ops,
-						       MLX5E_REPORTER_RX_GRACEFUL_PERIOD, priv);
+	reporter = devl_port_health_reporter_create(dl_port, &mlx5_rx_reporter_ops,
+						    MLX5E_REPORTER_RX_GRACEFUL_PERIOD, priv);
 	if (IS_ERR(reporter)) {
 		netdev_warn(priv->netdev, "Failed to create rx reporter, err = %ld\n",
 			    PTR_ERR(reporter));
@@ -754,6 +754,6 @@ void mlx5e_reporter_rx_destroy(struct mlx5e_priv *priv)
 	if (!priv->rx_reporter)
 		return;
 
-	devlink_port_health_reporter_destroy(priv->rx_reporter);
+	devl_health_reporter_destroy(priv->rx_reporter);
 	priv->rx_reporter = NULL;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
index 60bc5b577ab9..a932878971ea 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
@@ -593,8 +593,8 @@ void mlx5e_reporter_tx_create(struct mlx5e_priv *priv)
 	struct devlink_port *dl_port = mlx5e_devlink_get_dl_port(priv);
 	struct devlink_health_reporter *reporter;
 
-	reporter = devlink_port_health_reporter_create(dl_port, &mlx5_tx_reporter_ops,
-						       MLX5_REPORTER_TX_GRACEFUL_PERIOD, priv);
+	reporter = devl_port_health_reporter_create(dl_port, &mlx5_tx_reporter_ops,
+						    MLX5_REPORTER_TX_GRACEFUL_PERIOD, priv);
 	if (IS_ERR(reporter)) {
 		netdev_warn(priv->netdev,
 			    "Failed to create tx reporter, err = %ld\n",
@@ -609,6 +609,6 @@ void mlx5e_reporter_tx_destroy(struct mlx5e_priv *priv)
 	if (!priv->tx_reporter)
 		return;
 
-	devlink_port_health_reporter_destroy(priv->tx_reporter);
+	devl_health_reporter_destroy(priv->tx_reporter);
 	priv->tx_reporter = NULL;
 }
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 0b791706a9c1..ab07db99eeb3 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2051,8 +2051,8 @@ static int mlxsw_core_health_init(struct mlxsw_core *mlxsw_core)
 	if (!(mlxsw_core->bus->features & MLXSW_BUS_F_TXRX))
 		return 0;
 
-	fw_fatal = devlink_health_reporter_create(devlink, &mlxsw_core_health_fw_fatal_ops,
-						  0, mlxsw_core);
+	fw_fatal = devl_health_reporter_create(devlink, &mlxsw_core_health_fw_fatal_ops,
+					       0, mlxsw_core);
 	if (IS_ERR(fw_fatal)) {
 		dev_err(mlxsw_core->bus_info->dev, "Failed to create fw fatal reporter");
 		return PTR_ERR(fw_fatal);
@@ -2072,7 +2072,7 @@ static int mlxsw_core_health_init(struct mlxsw_core *mlxsw_core)
 err_fw_fatal_config:
 	mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_core_health_listener, mlxsw_core);
 err_trap_register:
-	devlink_health_reporter_destroy(mlxsw_core->health.fw_fatal);
+	devl_health_reporter_destroy(mlxsw_core->health.fw_fatal);
 	return err;
 }
 
@@ -2085,7 +2085,7 @@ static void mlxsw_core_health_fini(struct mlxsw_core *mlxsw_core)
 	mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_core_health_listener, mlxsw_core);
 	/* Make sure there is no more event work scheduled */
 	mlxsw_core_flush_owq();
-	devlink_health_reporter_destroy(mlxsw_core->health.fw_fatal);
+	devl_health_reporter_destroy(mlxsw_core->health.fw_fatal);
 }
 
 static void mlxsw_core_irq_event_handler_init(struct mlxsw_core *mlxsw_core)
diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
index aa77af4a68df..eb04ed715d2d 100644
--- a/drivers/net/netdevsim/health.c
+++ b/drivers/net/netdevsim/health.c
@@ -233,16 +233,16 @@ int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
 	int err;
 
 	health->empty_reporter =
-		devlink_health_reporter_create(devlink,
-					       &nsim_dev_empty_reporter_ops,
-					       0, health);
+		devl_health_reporter_create(devlink,
+					    &nsim_dev_empty_reporter_ops,
+					    0, health);
 	if (IS_ERR(health->empty_reporter))
 		return PTR_ERR(health->empty_reporter);
 
 	health->dummy_reporter =
-		devlink_health_reporter_create(devlink,
-					       &nsim_dev_dummy_reporter_ops,
-					       0, health);
+		devl_health_reporter_create(devlink,
+					    &nsim_dev_dummy_reporter_ops,
+					    0, health);
 	if (IS_ERR(health->dummy_reporter)) {
 		err = PTR_ERR(health->dummy_reporter);
 		goto err_empty_reporter_destroy;
@@ -266,9 +266,9 @@ int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
 	return 0;
 
 err_dummy_reporter_destroy:
-	devlink_health_reporter_destroy(health->dummy_reporter);
+	devl_health_reporter_destroy(health->dummy_reporter);
 err_empty_reporter_destroy:
-	devlink_health_reporter_destroy(health->empty_reporter);
+	devl_health_reporter_destroy(health->empty_reporter);
 	return err;
 }
 
@@ -278,6 +278,6 @@ void nsim_dev_health_exit(struct nsim_dev *nsim_dev)
 
 	debugfs_remove_recursive(health->ddir);
 	kfree(health->recovered_break_msg);
-	devlink_health_reporter_destroy(health->dummy_reporter);
-	devlink_health_reporter_destroy(health->empty_reporter);
+	devl_health_reporter_destroy(health->dummy_reporter);
+	devl_health_reporter_destroy(health->empty_reporter);
 }
diff --git a/include/net/devlink.h b/include/net/devlink.h
index d7c9572e5bea..ef9bea6ecc63 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -146,7 +146,6 @@ struct devlink_port {
 	   initialized:1;
 	struct delayed_work type_warn_dw;
 	struct list_head reporter_list;
-	struct mutex reporters_lock; /* Protects reporter_list */
 
 	struct devlink_rate *devlink_rate;
 	struct devlink_linecard *linecard;
@@ -1864,21 +1863,26 @@ int devlink_fmsg_string_pair_put(struct devlink_fmsg *fmsg, const char *name,
 int devlink_fmsg_binary_pair_put(struct devlink_fmsg *fmsg, const char *name,
 				 const void *value, u32 value_len);
 
+struct devlink_health_reporter *
+devl_port_health_reporter_create(struct devlink_port *port,
+				 const struct devlink_health_reporter_ops *ops,
+				 u64 graceful_period, void *priv);
+
+struct devlink_health_reporter *
+devl_health_reporter_create(struct devlink *devlink,
+			    const struct devlink_health_reporter_ops *ops,
+			    u64 graceful_period, void *priv);
+
 struct devlink_health_reporter *
 devlink_health_reporter_create(struct devlink *devlink,
 			       const struct devlink_health_reporter_ops *ops,
 			       u64 graceful_period, void *priv);
 
-struct devlink_health_reporter *
-devlink_port_health_reporter_create(struct devlink_port *port,
-				    const struct devlink_health_reporter_ops *ops,
-				    u64 graceful_period, void *priv);
-
 void
-devlink_health_reporter_destroy(struct devlink_health_reporter *reporter);
+devl_health_reporter_destroy(struct devlink_health_reporter *reporter);
 
 void
-devlink_port_health_reporter_destroy(struct devlink_health_reporter *reporter);
+devlink_health_reporter_destroy(struct devlink_health_reporter *reporter);
 
 void *
 devlink_health_reporter_priv(struct devlink_health_reporter *reporter);
diff --git a/net/devlink/core.c b/net/devlink/core.c
index d223a46fe557..4142b69ec680 100644
--- a/net/devlink/core.c
+++ b/net/devlink/core.c
@@ -217,7 +217,6 @@ struct devlink *devlink_alloc_ns(const struct devlink_ops *ops,
 	lockdep_register_key(&devlink->lock_key);
 	mutex_init(&devlink->lock);
 	lockdep_set_class(&devlink->lock, &devlink->lock_key);
-	mutex_init(&devlink->reporters_lock);
 	refcount_set(&devlink->refcount, 1);
 
 	return devlink;
@@ -239,7 +238,6 @@ void devlink_free(struct devlink *devlink)
 {
 	ASSERT_DEVLINK_NOT_REGISTERED(devlink);
 
-	mutex_destroy(&devlink->reporters_lock);
 	mutex_destroy(&devlink->lock);
 	lockdep_unregister_key(&devlink->lock_key);
 	WARN_ON(!list_empty(&devlink->trap_policer_list));
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index ca49ad31027c..69d10b93616e 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -31,7 +31,6 @@ struct devlink {
 	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;
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 2208711b4b18..70b8a9f15ac3 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -7278,12 +7278,10 @@ EXPORT_SYMBOL_GPL(devlink_health_reporter_priv);
 
 static struct devlink_health_reporter *
 __devlink_health_reporter_find_by_name(struct list_head *reporter_list,
-				       struct mutex *list_lock,
 				       const char *reporter_name)
 {
 	struct devlink_health_reporter *reporter;
 
-	lockdep_assert_held(list_lock);
 	list_for_each_entry(reporter, reporter_list, list)
 		if (!strcmp(reporter->ops->name, reporter_name))
 			return reporter;
@@ -7295,7 +7293,6 @@ devlink_health_reporter_find_by_name(struct devlink *devlink,
 				     const char *reporter_name)
 {
 	return __devlink_health_reporter_find_by_name(&devlink->reporter_list,
-						      &devlink->reporters_lock,
 						      reporter_name);
 }
 
@@ -7304,7 +7301,6 @@ devlink_port_health_reporter_find_by_name(struct devlink_port *devlink_port,
 					  const char *reporter_name)
 {
 	return __devlink_health_reporter_find_by_name(&devlink_port->reporter_list,
-						      &devlink_port->reporters_lock,
 						      reporter_name);
 }
 
@@ -7334,8 +7330,8 @@ __devlink_health_reporter_create(struct devlink *devlink,
 }
 
 /**
- *	devlink_port_health_reporter_create - create devlink health reporter for
- *	                                      specified port instance
+ *	devl_port_health_reporter_create - create devlink health reporter for
+ *	                                   specified port instance
  *
  *	@port: devlink_port which should contain the new reporter
  *	@ops: ops
@@ -7343,34 +7339,31 @@ __devlink_health_reporter_create(struct devlink *devlink,
  *	@priv: priv
  */
 struct devlink_health_reporter *
-devlink_port_health_reporter_create(struct devlink_port *port,
-				    const struct devlink_health_reporter_ops *ops,
-				    u64 graceful_period, void *priv)
+devl_port_health_reporter_create(struct devlink_port *port,
+				 const struct devlink_health_reporter_ops *ops,
+				 u64 graceful_period, void *priv)
 {
 	struct devlink_health_reporter *reporter;
 
-	mutex_lock(&port->reporters_lock);
+	devl_assert_locked(port->devlink);
+
 	if (__devlink_health_reporter_find_by_name(&port->reporter_list,
-						   &port->reporters_lock, ops->name)) {
-		reporter = ERR_PTR(-EEXIST);
-		goto unlock;
-	}
+						   ops->name))
+		return ERR_PTR(-EEXIST);
 
 	reporter = __devlink_health_reporter_create(port->devlink, ops,
 						    graceful_period, priv);
 	if (IS_ERR(reporter))
-		goto unlock;
+		return reporter;
 
 	reporter->devlink_port = port;
 	list_add_tail(&reporter->list, &port->reporter_list);
-unlock:
-	mutex_unlock(&port->reporters_lock);
 	return reporter;
 }
-EXPORT_SYMBOL_GPL(devlink_port_health_reporter_create);
+EXPORT_SYMBOL_GPL(devl_port_health_reporter_create);
 
 /**
- *	devlink_health_reporter_create - create devlink health reporter
+ *	devl_health_reporter_create - create devlink health reporter
  *
  *	@devlink: devlink
  *	@ops: ops
@@ -7378,26 +7371,38 @@ EXPORT_SYMBOL_GPL(devlink_port_health_reporter_create);
  *	@priv: priv
  */
 struct devlink_health_reporter *
-devlink_health_reporter_create(struct devlink *devlink,
-			       const struct devlink_health_reporter_ops *ops,
-			       u64 graceful_period, void *priv)
+devl_health_reporter_create(struct devlink *devlink,
+			    const struct devlink_health_reporter_ops *ops,
+			    u64 graceful_period, void *priv)
 {
 	struct devlink_health_reporter *reporter;
 
-	mutex_lock(&devlink->reporters_lock);
-	if (devlink_health_reporter_find_by_name(devlink, ops->name)) {
-		reporter = ERR_PTR(-EEXIST);
-		goto unlock;
-	}
+	devl_assert_locked(devlink);
+
+	if (devlink_health_reporter_find_by_name(devlink, ops->name))
+		return ERR_PTR(-EEXIST);
 
 	reporter = __devlink_health_reporter_create(devlink, ops,
 						    graceful_period, priv);
 	if (IS_ERR(reporter))
-		goto unlock;
+		return reporter;
 
 	list_add_tail(&reporter->list, &devlink->reporter_list);
-unlock:
-	mutex_unlock(&devlink->reporters_lock);
+	return reporter;
+}
+EXPORT_SYMBOL_GPL(devl_health_reporter_create);
+
+struct devlink_health_reporter *
+devlink_health_reporter_create(struct devlink *devlink,
+			       const struct devlink_health_reporter_ops *ops,
+			       u64 graceful_period, void *priv)
+{
+	struct devlink_health_reporter *reporter;
+
+	devl_lock(devlink);
+	reporter = devl_health_reporter_create(devlink, ops,
+					       graceful_period, priv);
+	devl_unlock(devlink);
 	return reporter;
 }
 EXPORT_SYMBOL_GPL(devlink_health_reporter_create);
@@ -7418,44 +7423,31 @@ devlink_health_reporter_put(struct devlink_health_reporter *reporter)
 		devlink_health_reporter_free(reporter);
 }
 
-static void
-__devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
-{
-	list_del(&reporter->list);
-	devlink_health_reporter_put(reporter);
-}
-
 /**
- *	devlink_health_reporter_destroy - destroy devlink health reporter
+ *	devl_health_reporter_destroy - destroy devlink health reporter
  *
  *	@reporter: devlink health reporter to destroy
  */
 void
-devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
+devl_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
-	struct mutex *lock = &reporter->devlink->reporters_lock;
+	devl_assert_locked(reporter->devlink);
 
-	mutex_lock(lock);
-	__devlink_health_reporter_destroy(reporter);
-	mutex_unlock(lock);
+	list_del(&reporter->list);
+	devlink_health_reporter_put(reporter);
 }
-EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
+EXPORT_SYMBOL_GPL(devl_health_reporter_destroy);
 
-/**
- *	devlink_port_health_reporter_destroy - destroy devlink port health reporter
- *
- *	@reporter: devlink health reporter to destroy
- */
 void
-devlink_port_health_reporter_destroy(struct devlink_health_reporter *reporter)
+devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
 {
-	struct mutex *lock = &reporter->devlink_port->reporters_lock;
+	struct devlink *devlink = reporter->devlink;
 
-	mutex_lock(lock);
-	__devlink_health_reporter_destroy(reporter);
-	mutex_unlock(lock);
+	devl_lock(devlink);
+	devl_health_reporter_destroy(reporter);
+	devl_unlock(devlink);
 }
-EXPORT_SYMBOL_GPL(devlink_port_health_reporter_destroy);
+EXPORT_SYMBOL_GPL(devlink_health_reporter_destroy);
 
 static int
 devlink_nl_health_reporter_fill(struct sk_buff *msg,
@@ -7696,17 +7688,13 @@ devlink_health_reporter_get_from_attrs(struct devlink *devlink,
 	reporter_name = nla_data(attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME]);
 	devlink_port = devlink_port_get_from_attrs(devlink, attrs);
 	if (IS_ERR(devlink_port)) {
-		mutex_lock(&devlink->reporters_lock);
 		reporter = devlink_health_reporter_find_by_name(devlink, reporter_name);
 		if (reporter)
 			refcount_inc(&reporter->refcount);
-		mutex_unlock(&devlink->reporters_lock);
 	} else {
-		mutex_lock(&devlink_port->reporters_lock);
 		reporter = devlink_port_health_reporter_find_by_name(devlink_port, reporter_name);
 		if (reporter)
 			refcount_inc(&reporter->refcount);
-		mutex_unlock(&devlink_port->reporters_lock);
 	}
 
 	return reporter;
@@ -7802,12 +7790,9 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 		unsigned long port_index;
 		int idx = 0;
 
-		mutex_lock(&devlink->reporters_lock);
-		if (!devl_is_registered(devlink)) {
-			mutex_unlock(&devlink->reporters_lock);
-			devlink_put(devlink);
-			continue;
-		}
+		devl_lock(devlink);
+		if (!devl_is_registered(devlink))
+			goto next_devlink;
 
 		list_for_each_entry(reporter, &devlink->reporter_list,
 				    list) {
@@ -7820,21 +7805,15 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 				NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 				NLM_F_MULTI);
 			if (err) {
-				mutex_unlock(&devlink->reporters_lock);
+				devl_unlock(devlink);
 				devlink_put(devlink);
 				state->idx = idx;
 				goto out;
 			}
 			idx++;
 		}
-		mutex_unlock(&devlink->reporters_lock);
-
-		devl_lock(devlink);
-		if (!devl_is_registered(devlink))
-			goto next_devlink;
 
 		xa_for_each(&devlink->ports, port_index, port) {
-			mutex_lock(&port->reporters_lock);
 			list_for_each_entry(reporter, &port->reporter_list, list) {
 				if (idx < state->idx) {
 					idx++;
@@ -7846,7 +7825,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 					NETLINK_CB(cb->skb).portid,
 					cb->nlh->nlmsg_seq, NLM_F_MULTI);
 				if (err) {
-					mutex_unlock(&port->reporters_lock);
 					devl_unlock(devlink);
 					devlink_put(devlink);
 					state->idx = idx;
@@ -7854,7 +7832,6 @@ devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
 				}
 				idx++;
 			}
-			mutex_unlock(&port->reporters_lock);
 		}
 next_devlink:
 		devl_unlock(devlink);
@@ -9580,12 +9557,9 @@ int devl_port_register(struct devlink *devlink,
 	devlink_port->index = port_index;
 	spin_lock_init(&devlink_port->type_lock);
 	INIT_LIST_HEAD(&devlink_port->reporter_list);
-	mutex_init(&devlink_port->reporters_lock);
 	err = xa_insert(&devlink->ports, port_index, devlink_port, GFP_KERNEL);
-	if (err) {
-		mutex_destroy(&devlink_port->reporters_lock);
+	if (err)
 		return err;
-	}
 
 	INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);
 	devlink_port_type_warn_schedule(devlink_port);
@@ -9636,7 +9610,6 @@ void devl_port_unregister(struct devlink_port *devlink_port)
 	devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_DEL);
 	xa_erase(&devlink_port->devlink->ports, devlink_port->index);
 	WARN_ON(!list_empty(&devlink_port->reporter_list));
-	mutex_destroy(&devlink_port->reporters_lock);
 	devlink_port->registered = false;
 }
 EXPORT_SYMBOL_GPL(devl_port_unregister);
-- 
2.39.0

Re: [patch net-next v2 4/9] devlink: remove reporters_lock

[Ido Schimmel]

On Sat, Jan 07, 2023 at 11:11:45AM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> Similar to other devlink objects, convert the reporters list to be
> protected by devlink instance lock. Alongside add unlocked versions
> of health reporter create functions and remove port-specific destroy
> function which is no longer needed.
> 
> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
> ---
>  .../ethernet/mellanox/mlx5/core/en/health.c   |  12 ++
>  .../mellanox/mlx5/core/en/reporter_rx.c       |   6 +-
>  .../mellanox/mlx5/core/en/reporter_tx.c       |   6 +-
>  drivers/net/ethernet/mellanox/mlxsw/core.c    |   8 +-
>  drivers/net/netdevsim/health.c                |  20 +--
>  include/net/devlink.h                         |  20 +--
>  net/devlink/core.c                            |   2 -
>  net/devlink/devl_internal.h                   |   1 -
>  net/devlink/leftover.c                        | 131 +++++++-----------
>  9 files changed, 96 insertions(+), 110 deletions(-)

This is quite difficult to review because there are multiple changes
squashed into one patch:

1. Addition of locked versions of both device and port health reporter
while refactoring the code to share code paths.

2. Removal of the reporters mutex.

3. Partial conversion of drivers to use the locked APIs. The conversion
of mlxsw and netdevsim is trivial because they hold the instance lock
during probe, but the conversion of mlx5 is less trivial. I would split
it into a separate patch.

Re: [patch net-next v2 4/9] devlink: remove reporters_lock

[Jiri Pirko]

Sun, Jan 08, 2023 at 05:28:50PM CET, idosch@nvidia.com wrote:
>On Sat, Jan 07, 2023 at 11:11:45AM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@nvidia.com>
>> 
>> Similar to other devlink objects, convert the reporters list to be
>> protected by devlink instance lock. Alongside add unlocked versions
>> of health reporter create functions and remove port-specific destroy
>> function which is no longer needed.
>> 
>> Signed-off-by: Jiri Pirko <jiri@nvidia.com>
>> ---
>>  .../ethernet/mellanox/mlx5/core/en/health.c   |  12 ++
>>  .../mellanox/mlx5/core/en/reporter_rx.c       |   6 +-
>>  .../mellanox/mlx5/core/en/reporter_tx.c       |   6 +-
>>  drivers/net/ethernet/mellanox/mlxsw/core.c    |   8 +-
>>  drivers/net/netdevsim/health.c                |  20 +--
>>  include/net/devlink.h                         |  20 +--
>>  net/devlink/core.c                            |   2 -
>>  net/devlink/devl_internal.h                   |   1 -
>>  net/devlink/leftover.c                        | 131 +++++++-----------
>>  9 files changed, 96 insertions(+), 110 deletions(-)
>
>This is quite difficult to review because there are multiple changes
>squashed into one patch:
>
>1. Addition of locked versions of both device and port health reporter
>while refactoring the code to share code paths.
>
>2. Removal of the reporters mutex.
>
>3. Partial conversion of drivers to use the locked APIs. The conversion
>of mlxsw and netdevsim is trivial because they hold the instance lock
>during probe, but the conversion of mlx5 is less trivial. I would split
>it into a separate patch.

Yeah, I was thinking about splitting this, however since the new lock
needs to be used on locked path with different helpers, it is not easy
to find a good split, was a bit lazy to do that. Anyway, let me think
and try again. Thanks!

[patch net-next v2 5/9] devlink: remove reporter reference counting

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

As long as the reporter live time is protected by devlink instance
lock, the reference counting is no longer needed. Remove it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 net/devlink/leftover.c | 113 +++++++++++------------------------------
 1 file changed, 30 insertions(+), 83 deletions(-)

diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index 70b8a9f15ac3..c512ddb6bd5e 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -7266,7 +7266,6 @@ struct devlink_health_reporter {
 	u64 error_count;
 	u64 recovery_count;
 	u64 last_recovery_ts;
-	refcount_t refcount;
 };
 
 void *
@@ -7325,7 +7324,6 @@ __devlink_health_reporter_create(struct devlink *devlink,
 	reporter->auto_recover = !!ops->recover;
 	reporter->auto_dump = !!ops->dump;
 	mutex_init(&reporter->dump_lock);
-	refcount_set(&reporter->refcount, 1);
 	return reporter;
 }
 
@@ -7416,13 +7414,6 @@ devlink_health_reporter_free(struct devlink_health_reporter *reporter)
 	kfree(reporter);
 }
 
-static void
-devlink_health_reporter_put(struct devlink_health_reporter *reporter)
-{
-	if (refcount_dec_and_test(&reporter->refcount))
-		devlink_health_reporter_free(reporter);
-}
-
 /**
  *	devl_health_reporter_destroy - destroy devlink health reporter
  *
@@ -7434,7 +7425,7 @@ devl_health_reporter_destroy(struct devlink_health_reporter *reporter)
 	devl_assert_locked(reporter->devlink);
 
 	list_del(&reporter->list);
-	devlink_health_reporter_put(reporter);
+	devlink_health_reporter_free(reporter);
 }
 EXPORT_SYMBOL_GPL(devl_health_reporter_destroy);
 
@@ -7678,7 +7669,6 @@ static struct devlink_health_reporter *
 devlink_health_reporter_get_from_attrs(struct devlink *devlink,
 				       struct nlattr **attrs)
 {
-	struct devlink_health_reporter *reporter;
 	struct devlink_port *devlink_port;
 	char *reporter_name;
 
@@ -7687,17 +7677,12 @@ devlink_health_reporter_get_from_attrs(struct devlink *devlink,
 
 	reporter_name = nla_data(attrs[DEVLINK_ATTR_HEALTH_REPORTER_NAME]);
 	devlink_port = devlink_port_get_from_attrs(devlink, attrs);
-	if (IS_ERR(devlink_port)) {
-		reporter = devlink_health_reporter_find_by_name(devlink, reporter_name);
-		if (reporter)
-			refcount_inc(&reporter->refcount);
-	} else {
-		reporter = devlink_port_health_reporter_find_by_name(devlink_port, reporter_name);
-		if (reporter)
-			refcount_inc(&reporter->refcount);
-	}
-
-	return reporter;
+	if (IS_ERR(devlink_port))
+		return devlink_health_reporter_find_by_name(devlink,
+							    reporter_name);
+	else
+		return devlink_port_health_reporter_find_by_name(devlink_port,
+								 reporter_name);
 }
 
 static struct devlink_health_reporter *
@@ -7756,10 +7741,8 @@ static int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,
 		return -EINVAL;
 
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (!msg) {
-		err = -ENOMEM;
-		goto out;
-	}
+	if (!msg)
+		return -ENOMEM;
 
 	err = devlink_nl_health_reporter_fill(msg, reporter,
 					      DEVLINK_CMD_HEALTH_REPORTER_GET,
@@ -7767,13 +7750,10 @@ static int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,
 					      0);
 	if (err) {
 		nlmsg_free(msg);
-		goto out;
+		return err;
 	}
 
-	err = genlmsg_reply(msg, info);
-out:
-	devlink_health_reporter_put(reporter);
-	return err;
+	return genlmsg_reply(msg, info);
 }
 
 static int
@@ -7847,7 +7827,6 @@ devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_health_reporter *reporter;
-	int err;
 
 	reporter = devlink_health_reporter_get_from_info(devlink, info);
 	if (!reporter)
@@ -7855,15 +7834,12 @@ devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 
 	if (!reporter->ops->recover &&
 	    (info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD] ||
-	     info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER])) {
-		err = -EOPNOTSUPP;
-		goto out;
-	}
+	     info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_RECOVER]))
+		return -EOPNOTSUPP;
+
 	if (!reporter->ops->dump &&
-	    info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP]) {
-		err = -EOPNOTSUPP;
-		goto out;
-	}
+	    info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP])
+		return -EOPNOTSUPP;
 
 	if (info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_GRACEFUL_PERIOD])
 		reporter->graceful_period =
@@ -7877,11 +7853,7 @@ devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 		reporter->auto_dump =
 		nla_get_u8(info->attrs[DEVLINK_ATTR_HEALTH_REPORTER_AUTO_DUMP]);
 
-	devlink_health_reporter_put(reporter);
 	return 0;
-out:
-	devlink_health_reporter_put(reporter);
-	return err;
 }
 
 static int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
@@ -7889,16 +7861,12 @@ static int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_health_reporter *reporter;
-	int err;
 
 	reporter = devlink_health_reporter_get_from_info(devlink, info);
 	if (!reporter)
 		return -EINVAL;
 
-	err = devlink_health_reporter_recover(reporter, NULL, info->extack);
-
-	devlink_health_reporter_put(reporter);
-	return err;
+	return devlink_health_reporter_recover(reporter, NULL, info->extack);
 }
 
 static int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
@@ -7913,36 +7881,27 @@ static int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
 	if (!reporter)
 		return -EINVAL;
 
-	if (!reporter->ops->diagnose) {
-		devlink_health_reporter_put(reporter);
+	if (!reporter->ops->diagnose)
 		return -EOPNOTSUPP;
-	}
 
 	fmsg = devlink_fmsg_alloc();
-	if (!fmsg) {
-		devlink_health_reporter_put(reporter);
+	if (!fmsg)
 		return -ENOMEM;
-	}
 
 	err = devlink_fmsg_obj_nest_start(fmsg);
 	if (err)
-		goto out;
+		return err;
 
 	err = reporter->ops->diagnose(reporter, fmsg, info->extack);
 	if (err)
-		goto out;
+		return err;
 
 	err = devlink_fmsg_obj_nest_end(fmsg);
 	if (err)
-		goto out;
-
-	err = devlink_fmsg_snd(fmsg, info,
-			       DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE, 0);
+		return err;
 
-out:
-	devlink_fmsg_free(fmsg);
-	devlink_health_reporter_put(reporter);
-	return err;
+	return devlink_fmsg_snd(fmsg, info,
+				DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE, 0);
 }
 
 static int
@@ -7957,10 +7916,9 @@ devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb,
 	if (!reporter)
 		return -EINVAL;
 
-	if (!reporter->ops->dump) {
-		err = -EOPNOTSUPP;
-		goto out;
-	}
+	if (!reporter->ops->dump)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&reporter->dump_lock);
 	if (!state->idx) {
 		err = devlink_health_do_dump(reporter, NULL, cb->extack);
@@ -7978,8 +7936,6 @@ devlink_nl_cmd_health_reporter_dump_get_dumpit(struct sk_buff *skb,
 				  DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET);
 unlock:
 	mutex_unlock(&reporter->dump_lock);
-out:
-	devlink_health_reporter_put(reporter);
 	return err;
 }
 
@@ -7994,15 +7950,12 @@ devlink_nl_cmd_health_reporter_dump_clear_doit(struct sk_buff *skb,
 	if (!reporter)
 		return -EINVAL;
 
-	if (!reporter->ops->dump) {
-		devlink_health_reporter_put(reporter);
+	if (!reporter->ops->dump)
 		return -EOPNOTSUPP;
-	}
 
 	mutex_lock(&reporter->dump_lock);
 	devlink_health_dump_clear(reporter);
 	mutex_unlock(&reporter->dump_lock);
-	devlink_health_reporter_put(reporter);
 	return 0;
 }
 
@@ -8011,21 +7964,15 @@ static int devlink_nl_cmd_health_reporter_test_doit(struct sk_buff *skb,
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_health_reporter *reporter;
-	int err;
 
 	reporter = devlink_health_reporter_get_from_info(devlink, info);
 	if (!reporter)
 		return -EINVAL;
 
-	if (!reporter->ops->test) {
-		devlink_health_reporter_put(reporter);
+	if (!reporter->ops->test)
 		return -EOPNOTSUPP;
-	}
-
-	err = reporter->ops->test(reporter, info->extack);
 
-	devlink_health_reporter_put(reporter);
-	return err;
+	return reporter->ops->test(reporter, info->extack);
 }
 
 struct devlink_stats {
-- 
2.39.0

[patch net-next v2 6/9] devlink: convert linecards dump to devlink_nl_instance_iter_dump()

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

Benefit from recently introduced instance iteration and convert
linecards .dumpit generic netlink callback to use it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 net/devlink/devl_internal.h |  1 +
 net/devlink/leftover.c      | 64 ++++++++++++++++---------------------
 net/devlink/netlink.c       |  1 +
 3 files changed, 30 insertions(+), 36 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 69d10b93616e..52d958c1c977 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -165,6 +165,7 @@ extern const struct devlink_gen_cmd devl_gen_info;
 extern const struct devlink_gen_cmd devl_gen_trap;
 extern const struct devlink_gen_cmd devl_gen_trap_group;
 extern const struct devlink_gen_cmd devl_gen_trap_policer;
+extern const struct devlink_gen_cmd devl_gen_linecard;
 
 /* Ports */
 int devlink_port_netdevice_event(struct notifier_block *nb,
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index c512ddb6bd5e..c5feda997932 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -2105,50 +2105,42 @@ static int devlink_nl_cmd_linecard_get_doit(struct sk_buff *skb,
 	return genlmsg_reply(msg, info);
 }
 
-static int devlink_nl_cmd_linecard_get_dumpit(struct sk_buff *msg,
-					      struct netlink_callback *cb)
+static int devlink_nl_cmd_linecard_get_dump_one(struct sk_buff *msg,
+						struct devlink *devlink,
+						struct netlink_callback *cb)
 {
 	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
 	struct devlink_linecard *linecard;
-	struct devlink *devlink;
-	int err;
-
-	devlink_dump_for_each_instance_get(msg, state, devlink) {
-		int idx = 0;
-
-		devl_lock(devlink);
-		if (!devl_is_registered(devlink))
-			goto next_devlink;
+	int idx = 0;
+	int err = 0;
 
-		list_for_each_entry(linecard, &devlink->linecard_list, list) {
-			if (idx < state->idx) {
-				idx++;
-				continue;
-			}
-			mutex_lock(&linecard->state_lock);
-			err = devlink_nl_linecard_fill(msg, devlink, linecard,
-						       DEVLINK_CMD_LINECARD_NEW,
-						       NETLINK_CB(cb->skb).portid,
-						       cb->nlh->nlmsg_seq,
-						       NLM_F_MULTI,
-						       cb->extack);
-			mutex_unlock(&linecard->state_lock);
-			if (err) {
-				devl_unlock(devlink);
-				devlink_put(devlink);
-				state->idx = idx;
-				goto out;
-			}
+	list_for_each_entry(linecard, &devlink->linecard_list, list) {
+		if (idx < state->idx) {
 			idx++;
+			continue;
 		}
-next_devlink:
-		devl_unlock(devlink);
-		devlink_put(devlink);
+		mutex_lock(&linecard->state_lock);
+		err = devlink_nl_linecard_fill(msg, devlink, linecard,
+					       DEVLINK_CMD_LINECARD_NEW,
+					       NETLINK_CB(cb->skb).portid,
+					       cb->nlh->nlmsg_seq,
+					       NLM_F_MULTI,
+					       cb->extack);
+		mutex_unlock(&linecard->state_lock);
+		if (err) {
+			state->idx = idx;
+			break;
+		}
+		idx++;
 	}
-out:
-	return msg->len;
+
+	return err;
 }
 
+const struct devlink_gen_cmd devl_gen_linecard = {
+	.dump_one		= devlink_nl_cmd_linecard_get_dump_one,
+};
+
 static struct devlink_linecard_type *
 devlink_linecard_type_lookup(struct devlink_linecard *linecard,
 			     const char *type)
@@ -8996,7 +8988,7 @@ const struct genl_small_ops devlink_nl_ops[56] = {
 	{
 		.cmd = DEVLINK_CMD_LINECARD_GET,
 		.doit = devlink_nl_cmd_linecard_get_doit,
-		.dumpit = devlink_nl_cmd_linecard_get_dumpit,
+		.dumpit = devlink_nl_instance_iter_dump,
 		.internal_flags = DEVLINK_NL_FLAG_NEED_LINECARD,
 		/* can be retrieved by unprivileged users */
 	},
diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index 3f2ab4360f11..b18e216e09b0 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -191,6 +191,7 @@ static const struct devlink_gen_cmd *devl_gen_cmds[] = {
 	[DEVLINK_CMD_TRAP_GET]		= &devl_gen_trap,
 	[DEVLINK_CMD_TRAP_GROUP_GET]	= &devl_gen_trap_group,
 	[DEVLINK_CMD_TRAP_POLICER_GET]	= &devl_gen_trap_policer,
+	[DEVLINK_CMD_LINECARD_GET]	= &devl_gen_linecard,
 	[DEVLINK_CMD_SELFTESTS_GET]	= &devl_gen_selftests,
 };
 
-- 
2.39.0

Re: [patch net-next v2 6/9] devlink: convert linecards dump to devlink_nl_instance_iter_dump()

[Ido Schimmel]

On Sat, Jan 07, 2023 at 11:11:47AM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@nvidia.com>
> 
> Benefit from recently introduced instance iteration and convert
> linecards .dumpit generic netlink callback to use it.
> 
> Signed-off-by: Jiri Pirko <jiri@nvidia.com>

Code looks good to me and consistent with other objects:

Reviewed-by: Ido Schimmel <idosch@nvidia.com>

[patch net-next v2 7/9] devlink: convert reporters dump to devlink_nl_instance_iter_dump()

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

Benefit from recently introduced instance iteration and convert
reporters .dumpit generic netlink callback to use it.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
v1->v2:
- unsquashed the next patch (devlink: remove
  devlink_dump_for_each_instance_get() helper) from this one
---
 net/devlink/devl_internal.h |  1 +
 net/devlink/leftover.c      | 87 ++++++++++++++++---------------------
 net/devlink/netlink.c       |  1 +
 3 files changed, 40 insertions(+), 49 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 52d958c1c977..1f046b4ab638 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -162,6 +162,7 @@ extern const struct devlink_gen_cmd devl_gen_selftests;
 extern const struct devlink_gen_cmd devl_gen_param;
 extern const struct devlink_gen_cmd devl_gen_region;
 extern const struct devlink_gen_cmd devl_gen_info;
+extern const struct devlink_gen_cmd devl_gen_health_reporter;
 extern const struct devlink_gen_cmd devl_gen_trap;
 extern const struct devlink_gen_cmd devl_gen_trap_group;
 extern const struct devlink_gen_cmd devl_gen_trap_policer;
diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
index c5feda997932..59fa5f543e8f 100644
--- a/net/devlink/leftover.c
+++ b/net/devlink/leftover.c
@@ -7749,70 +7749,59 @@ static int devlink_nl_cmd_health_reporter_get_doit(struct sk_buff *skb,
 }
 
 static int
-devlink_nl_cmd_health_reporter_get_dumpit(struct sk_buff *msg,
-					  struct netlink_callback *cb)
+devlink_nl_cmd_health_reporter_get_dump_one(struct sk_buff *msg,
+					    struct devlink *devlink,
+					    struct netlink_callback *cb)
 {
 	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
-	struct devlink *devlink;
+	struct devlink_health_reporter *reporter;
+	struct devlink_port *port;
+	unsigned long port_index;
+	int idx = 0;
 	int err;
 
-	devlink_dump_for_each_instance_get(msg, state, devlink) {
-		struct devlink_health_reporter *reporter;
-		struct devlink_port *port;
-		unsigned long port_index;
-		int idx = 0;
-
-		devl_lock(devlink);
-		if (!devl_is_registered(devlink))
-			goto next_devlink;
-
-		list_for_each_entry(reporter, &devlink->reporter_list,
-				    list) {
+	list_for_each_entry(reporter, &devlink->reporter_list, list) {
+		if (idx < state->idx) {
+			idx++;
+			continue;
+		}
+		err = devlink_nl_health_reporter_fill(msg, reporter,
+						      DEVLINK_CMD_HEALTH_REPORTER_GET,
+						      NETLINK_CB(cb->skb).portid,
+						      cb->nlh->nlmsg_seq,
+						      NLM_F_MULTI);
+		if (err) {
+			state->idx = idx;
+			return err;
+		}
+		idx++;
+	}
+	xa_for_each(&devlink->ports, port_index, port) {
+		list_for_each_entry(reporter, &port->reporter_list, list) {
 			if (idx < state->idx) {
 				idx++;
 				continue;
 			}
-			err = devlink_nl_health_reporter_fill(
-				msg, reporter, DEVLINK_CMD_HEALTH_REPORTER_GET,
-				NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
-				NLM_F_MULTI);
+			err = devlink_nl_health_reporter_fill(msg, reporter,
+							      DEVLINK_CMD_HEALTH_REPORTER_GET,
+							      NETLINK_CB(cb->skb).portid,
+							      cb->nlh->nlmsg_seq,
+							      NLM_F_MULTI);
 			if (err) {
-				devl_unlock(devlink);
-				devlink_put(devlink);
 				state->idx = idx;
-				goto out;
+				return err;
 			}
 			idx++;
 		}
-
-		xa_for_each(&devlink->ports, port_index, port) {
-			list_for_each_entry(reporter, &port->reporter_list, list) {
-				if (idx < state->idx) {
-					idx++;
-					continue;
-				}
-				err = devlink_nl_health_reporter_fill(
-					msg, reporter,
-					DEVLINK_CMD_HEALTH_REPORTER_GET,
-					NETLINK_CB(cb->skb).portid,
-					cb->nlh->nlmsg_seq, NLM_F_MULTI);
-				if (err) {
-					devl_unlock(devlink);
-					devlink_put(devlink);
-					state->idx = idx;
-					goto out;
-				}
-				idx++;
-			}
-		}
-next_devlink:
-		devl_unlock(devlink);
-		devlink_put(devlink);
 	}
-out:
-	return msg->len;
+
+	return 0;
 }
 
+const struct devlink_gen_cmd devl_gen_health_reporter = {
+	.dump_one		= devlink_nl_cmd_health_reporter_get_dump_one,
+};
+
 static int
 devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 					struct genl_info *info)
@@ -9179,7 +9168,7 @@ const struct genl_small_ops devlink_nl_ops[56] = {
 		.cmd = DEVLINK_CMD_HEALTH_REPORTER_GET,
 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
 		.doit = devlink_nl_cmd_health_reporter_get_doit,
-		.dumpit = devlink_nl_cmd_health_reporter_get_dumpit,
+		.dumpit = devlink_nl_instance_iter_dump,
 		.internal_flags = DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT,
 		/* can be retrieved by unprivileged users */
 	},
diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index b18e216e09b0..d4539c1aedea 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -187,6 +187,7 @@ static const struct devlink_gen_cmd *devl_gen_cmds[] = {
 	[DEVLINK_CMD_PARAM_GET]		= &devl_gen_param,
 	[DEVLINK_CMD_REGION_GET]	= &devl_gen_region,
 	[DEVLINK_CMD_INFO_GET]		= &devl_gen_info,
+	[DEVLINK_CMD_HEALTH_REPORTER_GET] = &devl_gen_health_reporter,
 	[DEVLINK_CMD_RATE_GET]		= &devl_gen_rate_get,
 	[DEVLINK_CMD_TRAP_GET]		= &devl_gen_trap,
 	[DEVLINK_CMD_TRAP_GROUP_GET]	= &devl_gen_trap_group,
-- 
2.39.0

[patch net-next 8/8] devlink: add instance lock assertion in devl_is_registered()

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

After region and linecard lock removals, this helper is always supposed
to be called with instance lock held. So put the assertion here and
remove the comment which is no longer accurate.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 net/devlink/devl_internal.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 2b0e119e7b84..09fc4d60fefb 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -83,9 +83,7 @@ struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);
 
 static inline bool devl_is_registered(struct devlink *devlink)
 {
-	/* To prevent races the caller must hold the instance lock
-	 * or another lock taken during unregistration.
-	 */
+	devl_assert_locked(devlink);
 	return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
 }
 
-- 
2.39.0

[patch net-next v2 8/9] devlink: remove devlink_dump_for_each_instance_get() helper

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

devlink_dump_for_each_instance_get() is currently called from
a single place in netlink.c. As there is no need to use
this helper anywhere else in the future, remove it and
call devlinks_xa_find_get() directly from while loop
in devlink_nl_instance_iter_dump(). Also remove redundant
idx clear on loop end as it is already done
in devlink_nl_instance_iter_dump().

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
v1->v2: new patch, unsquashed from the previous one
---
 net/devlink/devl_internal.h | 11 -----------
 net/devlink/netlink.c       |  5 ++++-
 2 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 1f046b4ab638..2b0e119e7b84 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -121,17 +121,6 @@ struct devlink_gen_cmd {
 			struct netlink_callback *cb);
 };
 
-/* Iterate over registered devlink instances for devlink dump.
- * devlink_put() needs to be called for each iterated devlink pointer
- * in loop body in order to release the reference.
- * Note: this is NOT a generic iterator, it makes assumptions about the use
- *	 of @state and can only be used once per dumpit implementation.
- */
-#define devlink_dump_for_each_instance_get(msg, state, devlink)		\
-	for (; (devlink = devlinks_xa_find_get(sock_net(msg->sk),	\
-					       &state->instance));	\
-	     state->instance++, state->idx = 0)
-
 extern const struct genl_small_ops devlink_nl_ops[56];
 
 struct devlink *
diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
index d4539c1aedea..3f44633af01c 100644
--- a/net/devlink/netlink.c
+++ b/net/devlink/netlink.c
@@ -207,7 +207,8 @@ int devlink_nl_instance_iter_dump(struct sk_buff *msg,
 
 	cmd = devl_gen_cmds[info->op.cmd];
 
-	devlink_dump_for_each_instance_get(msg, state, devlink) {
+	while ((devlink = devlinks_xa_find_get(sock_net(msg->sk),
+					       &state->instance))) {
 		devl_lock(devlink);
 
 		if (devl_is_registered(devlink))
@@ -221,6 +222,8 @@ int devlink_nl_instance_iter_dump(struct sk_buff *msg,
 		if (err)
 			break;
 
+		state->instance++;
+
 		/* restart sub-object walk for the next instance */
 		state->idx = 0;
 	}
-- 
2.39.0

[patch net-next v2 9/9] devlink: add instance lock assertion in devl_is_registered()

[Jiri Pirko]

From: Jiri Pirko <jiri@nvidia.com>

After region and linecard lock removals, this helper is always supposed
to be called with instance lock held. So put the assertion here and
remove the comment which is no longer accurate.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 net/devlink/devl_internal.h | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 2b0e119e7b84..09fc4d60fefb 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -83,9 +83,7 @@ struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp);
 
 static inline bool devl_is_registered(struct devlink *devlink)
 {
-	/* To prevent races the caller must hold the instance lock
-	 * or another lock taken during unregistration.
-	 */
+	devl_assert_locked(devlink);
 	return xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED);
 }
 
-- 
2.39.0