diff options
Diffstat (limited to 'net/wimax/id-table.c')
| -rw-r--r-- | net/wimax/id-table.c | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/net/wimax/id-table.c b/net/wimax/id-table.c deleted file mode 100644 index 02eee37b7e31..000000000000 --- a/net/wimax/id-table.c +++ /dev/null @@ -1,130 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Linux WiMAX - * Mappping of generic netlink family IDs to net devices - * - * Copyright (C) 2005-2006 Intel Corporation <linux-wimax@intel.com> - * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> - * - * We assign a single generic netlink family ID to each device (to - * simplify lookup). - * - * We need a way to map family ID to a wimax_dev pointer. - * - * The idea is to use a very simple lookup. Using a netlink attribute - * with (for example) the interface name implies a heavier search over - * all the network devices; seemed kind of a waste given that we know - * we are looking for a WiMAX device and that most systems will have - * just a single WiMAX adapter. - * - * We put all the WiMAX devices in the system in a linked list and - * match the generic link family ID against the list. - * - * By using a linked list, the case of a single adapter in the system - * becomes (almost) no overhead, while still working for many more. If - * it ever goes beyond two, I'll be surprised. - */ -#include <linux/device.h> -#include <net/genetlink.h> -#include <linux/netdevice.h> -#include <linux/list.h> -#include <linux/wimax.h> -#include "wimax-internal.h" - - -#define D_SUBMODULE id_table -#include "debug-levels.h" - - -static DEFINE_SPINLOCK(wimax_id_table_lock); -static struct list_head wimax_id_table = LIST_HEAD_INIT(wimax_id_table); - - -/* - * wimax_id_table_add - add a gennetlink familiy ID / wimax_dev mapping - * - * @wimax_dev: WiMAX device descriptor to associate to the Generic - * Netlink family ID. - * - * Look for an empty spot in the ID table; if none found, double the - * table's size and get the first spot. - */ -void wimax_id_table_add(struct wimax_dev *wimax_dev) -{ - d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev); - spin_lock(&wimax_id_table_lock); - list_add(&wimax_dev->id_table_node, &wimax_id_table); - spin_unlock(&wimax_id_table_lock); - d_fnend(3, NULL, "(wimax_dev %p)\n", wimax_dev); -} - - -/* - * wimax_get_netdev_by_info - lookup a wimax_dev from the gennetlink info - * - * The generic netlink family ID has been filled out in the - * nlmsghdr->nlmsg_type field, so we pull it from there, look it up in - * the mapping table and reference the wimax_dev. - * - * When done, the reference should be dropped with - * 'dev_put(wimax_dev->net_dev)'. - */ -struct wimax_dev *wimax_dev_get_by_genl_info( - struct genl_info *info, int ifindex) -{ - struct wimax_dev *wimax_dev = NULL; - - d_fnstart(3, NULL, "(info %p ifindex %d)\n", info, ifindex); - spin_lock(&wimax_id_table_lock); - list_for_each_entry(wimax_dev, &wimax_id_table, id_table_node) { - if (wimax_dev->net_dev->ifindex == ifindex) { - dev_hold(wimax_dev->net_dev); - goto found; - } - } - wimax_dev = NULL; - d_printf(1, NULL, "wimax: no devices found with ifindex %d\n", - ifindex); -found: - spin_unlock(&wimax_id_table_lock); - d_fnend(3, NULL, "(info %p ifindex %d) = %p\n", - info, ifindex, wimax_dev); - return wimax_dev; -} - - -/* - * wimax_id_table_rm - Remove a gennetlink familiy ID / wimax_dev mapping - * - * @id: family ID to remove from the table - */ -void wimax_id_table_rm(struct wimax_dev *wimax_dev) -{ - spin_lock(&wimax_id_table_lock); - list_del_init(&wimax_dev->id_table_node); - spin_unlock(&wimax_id_table_lock); -} - - -/* - * Release the gennetlink family id / mapping table - * - * On debug, verify that the table is empty upon removal. We want the - * code always compiled, to ensure it doesn't bit rot. It will be - * compiled out if CONFIG_BUG is disabled. - */ -void wimax_id_table_release(void) -{ - struct wimax_dev *wimax_dev; - -#ifndef CONFIG_BUG - return; -#endif - spin_lock(&wimax_id_table_lock); - list_for_each_entry(wimax_dev, &wimax_id_table, id_table_node) { - pr_err("BUG: %s wimax_dev %p ifindex %d not cleared\n", - __func__, wimax_dev, wimax_dev->net_dev->ifindex); - WARN_ON(1); - } - spin_unlock(&wimax_id_table_lock); -} |