netdevsim: replace vfs_lock with devlink instance lock

Similarly to the previous commit, use the devlink instance
lock and let it replace the vfs_lock.

nsim_esw_legacy_enable() was locked by both port lock and
vfs lock so one set of lock/unlocks goes away.

netdevsim's .eswitch_mode_set callback is now ready for
the callback to take the instance lock.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index dd650d4..68cd1de 100644 (file)
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -59,7 +59,7 @@ static struct dentry *nsim_dev_ddir;
 unsigned int nsim_dev_get_vfs(struct nsim_dev *nsim_dev)
 {
        WARN_ON(!lockdep_rtnl_is_held() &&
-               !lockdep_is_held(&nsim_dev->vfs_lock));
+               !devl_lock_is_held(priv_to_devlink(nsim_dev)));
 
        return nsim_dev->nsim_bus_dev->num_vfs;
 }
@@ -275,7 +275,7 @@ static ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
                return -ENOMEM;
 
        nsim_dev = file->private_data;
-       mutex_lock(&nsim_dev->vfs_lock);
+       devl_lock(priv_to_devlink(nsim_dev));
        /* Reject if VFs are configured */
        if (nsim_dev_get_vfs(nsim_dev)) {
                ret = -EBUSY;
@@ -285,7 +285,7 @@ static ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
                *ppos += count;
                ret = count;
        }
-       mutex_unlock(&nsim_dev->vfs_lock);
+       devl_unlock(priv_to_devlink(nsim_dev));
 
        kfree(vfconfigs);
        return ret;
@@ -339,6 +339,7 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
        debugfs_create_bool("fail_trap_policer_counter_get", 0600,
                            nsim_dev->ddir,
                            &nsim_dev->fail_trap_policer_counter_get);
+       /* caution, dev_max_vfs write takes devlink lock */
        debugfs_create_file("max_vfs", 0600, nsim_dev->ddir,
                            nsim_dev, &nsim_dev_max_vfs_fops);
 
@@ -567,6 +568,9 @@ static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)
        devlink_region_destroy(nsim_dev->dummy_region);
 }
 
+static int
+__nsim_dev_port_add(struct nsim_dev *nsim_dev, enum nsim_dev_port_type type,
+                   unsigned int port_index);
 static void __nsim_dev_port_del(struct nsim_dev_port *nsim_dev_port);
 
 static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
@@ -575,12 +579,10 @@ static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
        struct devlink *devlink = priv_to_devlink(nsim_dev);
        struct nsim_dev_port *nsim_dev_port, *tmp;
 
-       devlink_rate_nodes_destroy(devlink);
-       devl_lock(devlink);
+       devl_rate_nodes_destroy(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);
-       devl_unlock(devlink);
        nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
        return 0;
 }
@@ -588,11 +590,11 @@ static int nsim_esw_legacy_enable(struct nsim_dev *nsim_dev,
 static int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev,
                                     struct netlink_ext_ack *extack)
 {
-       struct nsim_bus_dev *nsim_bus_dev = nsim_dev->nsim_bus_dev;
+       struct nsim_dev_port *nsim_dev_port, *tmp;
        int i, err;
 
        for (i = 0; i < nsim_dev_get_vfs(nsim_dev); i++) {
-               err = nsim_drv_port_add(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
+               err = __nsim_dev_port_add(nsim_dev, NSIM_DEV_PORT_TYPE_VF, i);
                if (err) {
                        NL_SET_ERR_MSG_MOD(extack, "Failed to initialize VFs' netdevsim ports");
                        pr_err("Failed to initialize VF id=%d. %d.\n", i, err);
@@ -603,8 +605,9 @@ static int nsim_esw_switchdev_enable(struct nsim_dev *nsim_dev,
        return 0;
 
 err_port_add_vfs:
-       for (i--; i >= 0; i--)
-               nsim_drv_port_del(nsim_bus_dev, NSIM_DEV_PORT_TYPE_VF, i);
+       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);
        return err;
 }
 
@@ -614,7 +617,7 @@ static int nsim_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
        struct nsim_dev *nsim_dev = devlink_priv(devlink);
        int err = 0;
 
-       mutex_lock(&nsim_dev->vfs_lock);
+       devl_lock(devlink);
        if (mode == nsim_dev->esw_mode)
                goto unlock;
 
@@ -626,7 +629,7 @@ static int nsim_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
                err = -EINVAL;
 
 unlock:
-       mutex_unlock(&nsim_dev->vfs_lock);
+       devl_unlock(devlink);
        return err;
 }
 
@@ -1545,7 +1548,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
        nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
        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);
        nsim_dev->fw_update_status = true;
        nsim_dev->fw_update_overwrite_mask = 0;
        nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
@@ -1652,13 +1654,13 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
                return;
        debugfs_remove(nsim_dev->take_snapshot);
 
-       mutex_lock(&nsim_dev->vfs_lock);
+       devl_lock(devlink);
        if (nsim_dev_get_vfs(nsim_dev)) {
                nsim_bus_dev_set_vfs(nsim_dev->nsim_bus_dev, 0);
                if (nsim_esw_mode_is_switchdev(nsim_dev))
                        nsim_esw_legacy_enable(nsim_dev, NULL);
        }
-       mutex_unlock(&nsim_dev->vfs_lock);
+       devl_unlock(devlink);
 
        nsim_dev_port_del_all(nsim_dev);
        nsim_dev_hwstats_exit(nsim_dev);
@@ -1736,9 +1738,10 @@ int nsim_drv_configure_vfs(struct nsim_bus_dev *nsim_bus_dev,
                           unsigned int num_vfs)
 {
        struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
+       struct devlink *devlink = priv_to_devlink(nsim_dev);
        int ret = 0;
 
-       mutex_lock(&nsim_dev->vfs_lock);
+       devl_lock(devlink);
        if (nsim_bus_dev->num_vfs == num_vfs)
                goto exit_unlock;
        if (nsim_bus_dev->num_vfs && num_vfs) {
@@ -1764,7 +1767,7 @@ int nsim_drv_configure_vfs(struct nsim_bus_dev *nsim_bus_dev,
        }
 
 exit_unlock:
-       mutex_unlock(&nsim_dev->vfs_lock);
+       devl_unlock(devlink);
 
        return ret;
 }

diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 8dd6f97..0b12287 100644 (file)
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -261,7 +261,6 @@ struct nsim_dev {
        struct dentry *take_snapshot;
        struct dentry *nodes_ddir;
 
-       struct mutex vfs_lock;  /* Protects vfconfigs */
        struct nsim_vf_config *vfconfigs;
 
        struct bpf_offload_dev *bpf_dev;