// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2019 Mellanox Technologies. All rights reserved */ #include <linux/debugfs.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/slab.h> #include "netdevsim.h" static struct dentry *nsim_sdev_ddir; static u32 nsim_sdev_id; struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns) { struct netdevsim_shared_dev *sdev; char sdev_ddir_name[10]; int err; if (joinns) { if (WARN_ON(!joinns->sdev)) return ERR_PTR(-EINVAL); sdev = joinns->sdev; sdev->refcnt++; return sdev; } sdev = kzalloc(sizeof(*sdev), GFP_KERNEL); if (!sdev) return ERR_PTR(-ENOMEM); sdev->refcnt = 1; sdev->switch_id = nsim_sdev_id++; sprintf(sdev_ddir_name, "%u", sdev->switch_id); sdev->ddir = debugfs_create_dir(sdev_ddir_name, nsim_sdev_ddir); if (IS_ERR_OR_NULL(sdev->ddir)) { err = PTR_ERR_OR_ZERO(sdev->ddir) ?: -EINVAL; goto err_sdev_free; } return sdev; err_sdev_free: nsim_sdev_id--; kfree(sdev); return ERR_PTR(err); } void nsim_sdev_put(struct netdevsim_shared_dev *sdev) { if (--sdev->refcnt) return; debugfs_remove_recursive(sdev->ddir); kfree(sdev); } int nsim_sdev_init(void) { nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL); if (IS_ERR_OR_NULL(nsim_sdev_ddir)) return -ENOMEM; return 0; } void nsim_sdev_exit(void) { debugfs_remove_recursive(nsim_sdev_ddir); }