diff mbox series

[net-next,v2,3/5] netdevsim: replace port_list_lock with devlink instance lock

Message ID 20220318192344.1587891-4-kuba@kernel.org (mailing list archive)
State Accepted
Commit 76eea6c2e663f7e9fbc258c82811ad9e657e085f
Delegated to: Netdev Maintainers
Headers show
Series devlink: hold the instance lock in eswitch callbacks | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 1 maintainers not CCed: pabeni@redhat.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 156 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jakub Kicinski March 18, 2022, 7:23 p.m. UTC 
Take advantage of the devlink instance lock for protecting
the port list. This will simplify locking even more once
all devlink callbacks hold the instance lock.

We need to add locking in nsim_dev_port_add_all() which used
to assume higher layer protection when accessing the list.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/netdevsim/dev.c       | 40 +++++++++++++++----------------
 drivers/net/netdevsim/netdevsim.h |  1 -
 2 files changed, 20 insertions(+), 21 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index dbc8e88d2841..dd650d4301e5 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -576,11 +576,11 @@  static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
 	struct nsim_dev_port *nsim_dev_port, *tmp;
 
 	devlink_rate_nodes_destroy(devlink);
-	mutex_lock(&nsim_dev->port_list_lock);
+	devl_lock(devlink);
 	list_for_each_entry_safe(nsim_dev_port, tmp, &nsim_dev->port_list, list)
 		if (nsim_dev_port_is_vf(nsim_dev_port))
 			__nsim_dev_port_del(nsim_dev_port);
-	mutex_unlock(&nsim_dev->port_list_lock);
+	devl_unlock(devlink);
 	nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 	return 0;
 }
@@ -835,14 +835,14 @@  static void nsim_dev_trap_report_work(struct work_struct *work)
 	/* For each running port and enabled packet trap, generate a UDP
 	 * packet with a random 5-tuple and report it.
 	 */
-	mutex_lock(&nsim_dev->port_list_lock);
+	devl_lock(priv_to_devlink(nsim_dev));
 	list_for_each_entry(nsim_dev_port, &nsim_dev->port_list, list) {
 		if (!netif_running(nsim_dev_port->ns->netdev))
 			continue;
 
 		nsim_dev_trap_report(nsim_dev_port);
 	}
-	mutex_unlock(&nsim_dev->port_list_lock);
+	devl_unlock(priv_to_devlink(nsim_dev));
 
 	schedule_delayed_work(&nsim_dev->trap_data->trap_report_dw,
 			      msecs_to_jiffies(NSIM_TRAP_REPORT_INTERVAL_MS));
@@ -924,6 +924,7 @@  static void nsim_dev_traps_exit(struct devlink *devlink)
 {
 	struct nsim_dev *nsim_dev = devlink_priv(devlink);
 
+	/* caution, trap work takes devlink lock */
 	cancel_delayed_work_sync(&nsim_dev->trap_data->trap_report_dw);
 	devlink_traps_unregister(devlink, nsim_traps_arr,
 				 ARRAY_SIZE(nsim_traps_arr));
@@ -1380,8 +1381,8 @@  static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_typ
 	memcpy(attrs.switch_id.id, nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 	attrs.switch_id.id_len = nsim_dev->switch_id.id_len;
 	devlink_port_attrs_set(devlink_port, &attrs);
-	err = devlink_port_register(priv_to_devlink(nsim_dev), devlink_port,
-				    nsim_dev_port->port_index);
+	err = devl_port_register(priv_to_devlink(nsim_dev), devlink_port,
+				 nsim_dev_port->port_index);
 	if (err)
 		goto err_port_free;
 
@@ -1396,8 +1397,8 @@  static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_typ
 	}
 
 	if (nsim_dev_port_is_vf(nsim_dev_port)) {
-		err = devlink_rate_leaf_create(&nsim_dev_port->devlink_port,
-					       nsim_dev_port);
+		err = devl_rate_leaf_create(&nsim_dev_port->devlink_port,
+					    nsim_dev_port);
 		if (err)
 			goto err_nsim_destroy;
 	}
@@ -1412,7 +1413,7 @@  static int __nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_typ
 err_port_debugfs_exit:
 	nsim_dev_port_debugfs_exit(nsim_dev_port);
 err_dl_port_unregister:
-	devlink_port_unregister(devlink_port);
+	devl_port_unregister(devlink_port);
 err_port_free:
 	kfree(nsim_dev_port);
 	return err;
@@ -1424,11 +1425,11 @@  static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port)
 
 	list_del(&nsim_dev_port->list);
 	if (nsim_dev_port_is_vf(nsim_dev_port))
-		devlink_rate_leaf_destroy(&nsim_dev_port->devlink_port);
+		devl_rate_leaf_destroy(&nsim_dev_port->devlink_port);
 	devlink_port_type_clear(devlink_port);
 	nsim_destroy(nsim_dev_port->ns);
 	nsim_dev_port_debugfs_exit(nsim_dev_port);
-	devlink_port_unregister(devlink_port);
+	devl_port_unregister(devlink_port);
 	kfree(nsim_dev_port);
 }
 
@@ -1436,11 +1437,11 @@  static void nsim_dev_port_del_all(struct nsim_dev *nsim_dev)
 {
 	struct nsim_dev_port *nsim_dev_port, *tmp;
 
-	mutex_lock(&nsim_dev->port_list_lock);
+	devl_lock(priv_to_devlink(nsim_dev));
 	list_for_each_entry_safe(nsim_dev_port, tmp,
 				 &nsim_dev->port_list, list)
 		__nsim_dev_port_del(nsim_dev_port);
-	mutex_unlock(&nsim_dev->port_list_lock);
+	devl_unlock(priv_to_devlink(nsim_dev));
 }
 
 static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
@@ -1449,7 +1450,9 @@  static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
 	int i, err;
 
 	for (i = 0; i < port_count; i++) {
+		devl_lock(priv_to_devlink(nsim_dev));
 		err = __nsim_dev_port_add(nsim_dev, NSIM_DEV_PORT_TYPE_PF, i);
+		devl_unlock(priv_to_devlink(nsim_dev));
 		if (err)
 			goto err_port_del_all;
 	}
@@ -1470,7 +1473,6 @@  static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 	devlink = priv_to_devlink(nsim_dev);
 	nsim_dev = devlink_priv(devlink);
 	INIT_LIST_HEAD(&nsim_dev->port_list);
-	mutex_init(&nsim_dev->port_list_lock);
 	nsim_dev->fw_update_status = true;
 	nsim_dev->fw_update_overwrite_mask = 0;
 
@@ -1544,7 +1546,6 @@  int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 	get_random_bytes(nsim_dev->switch_id.id, nsim_dev->switch_id.id_len);
 	INIT_LIST_HEAD(&nsim_dev->port_list);
 	mutex_init(&nsim_dev->vfs_lock);
-	mutex_init(&nsim_dev->port_list_lock);
 	nsim_dev->fw_update_status = true;
 	nsim_dev->fw_update_overwrite_mask = 0;
 	nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
@@ -1666,7 +1667,6 @@  static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
 	nsim_fib_destroy(devlink, nsim_dev->fib_data);
 	nsim_dev_traps_exit(devlink);
 	nsim_dev_dummy_region_exit(nsim_dev);
-	mutex_destroy(&nsim_dev->port_list_lock);
 }
 
 void nsim_drv_remove(struct nsim_bus_dev *nsim_bus_dev)
@@ -1706,12 +1706,12 @@  int nsim_drv_port_add(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type
 	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	int err;
 
-	mutex_lock(&nsim_dev->port_list_lock);
+	devl_lock(priv_to_devlink(nsim_dev));
 	if (__nsim_dev_port_lookup(nsim_dev, type, port_index))
 		err = -EEXIST;
 	else
 		err = __nsim_dev_port_add(nsim_dev, type, port_index);
-	mutex_unlock(&nsim_dev->port_list_lock);
+	devl_unlock(priv_to_devlink(nsim_dev));
 	return err;
 }
 
@@ -1722,13 +1722,13 @@  int nsim_drv_port_del(struct nsim_bus_dev *nsim_bus_dev, enum nsim_dev_port_type
 	struct nsim_dev_port *nsim_dev_port;
 	int err = 0;
 
-	mutex_lock(&nsim_dev->port_list_lock);
+	devl_lock(priv_to_devlink(nsim_dev));
 	nsim_dev_port = __nsim_dev_port_lookup(nsim_dev, type, port_index);
 	if (!nsim_dev_port)
 		err = -ENOENT;
 	else
 		__nsim_dev_port_del(nsim_dev_port);
-	mutex_unlock(&nsim_dev->port_list_lock);
+	devl_unlock(priv_to_devlink(nsim_dev));
 	return err;
 }
 
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 128f229d9b4d..8dd6f975f32d 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -274,7 +274,6 @@  struct nsim_dev {
 	struct list_head bpf_bound_maps;
 	struct netdev_phys_item_id switch_id;
 	struct list_head port_list;
-	struct mutex port_list_lock; /* protects port list */
 	bool fw_update_status;
 	u32 fw_update_overwrite_mask;
 	u32 max_macs;