636 lines
18 KiB
C
636 lines
18 KiB
C
/*
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* Linux WiMAX
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* Initialization, addition and removal of wimax devices
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*
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*
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* Copyright (C) 2005-2006 Intel Corporation <linux-wimax@intel.com>
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* This implements:
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*
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* - basic life cycle of 'struct wimax_dev' [wimax_dev_*()]; on
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* addition/registration initialize all subfields and allocate
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* generic netlink resources for user space communication. On
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* removal/unregistration, undo all that.
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*
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* - device state machine [wimax_state_change()] and support to send
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* reports to user space when the state changes
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* [wimax_gnl_re_state_change*()].
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*
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* See include/net/wimax.h for rationales and design.
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*
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* ROADMAP
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*
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* [__]wimax_state_change() Called by drivers to update device's state
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* wimax_gnl_re_state_change_alloc()
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* wimax_gnl_re_state_change_send()
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*
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* wimax_dev_init() Init a device
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* wimax_dev_add() Register
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* wimax_rfkill_add()
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* wimax_gnl_add() Register all the generic netlink resources.
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* wimax_id_table_add()
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* wimax_dev_rm() Unregister
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* wimax_id_table_rm()
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* wimax_gnl_rm()
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* wimax_rfkill_rm()
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*/
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#include <linux/device.h>
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#include <net/genetlink.h>
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#include <linux/netdevice.h>
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#include <linux/wimax.h>
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#include "wimax-internal.h"
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#define D_SUBMODULE stack
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#include "debug-levels.h"
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static char wimax_debug_params[128];
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module_param_string(debug, wimax_debug_params, sizeof(wimax_debug_params),
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0644);
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MODULE_PARM_DESC(debug,
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"String of space-separated NAME:VALUE pairs, where NAMEs "
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"are the different debug submodules and VALUE are the "
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"initial debug value to set.");
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/*
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* Authoritative source for the RE_STATE_CHANGE attribute policy
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*
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* We don't really use it here, but /me likes to keep the definition
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* close to where the data is generated.
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*/
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/*
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static const
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struct nla_policy wimax_gnl_re_status_change[WIMAX_GNL_ATTR_MAX + 1] = {
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[WIMAX_GNL_STCH_STATE_OLD] = { .type = NLA_U8 },
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[WIMAX_GNL_STCH_STATE_NEW] = { .type = NLA_U8 },
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};
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*/
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/*
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* Allocate a Report State Change message
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*
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* @header: save it, you need it for _send()
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*
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* Creates and fills a basic state change message; different code
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* paths can then add more attributes to the message as needed.
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*
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* Use wimax_gnl_re_state_change_send() to send the returned skb.
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*
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* Returns: skb with the genl message if ok, IS_ERR() ptr on error
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* with an errno code.
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*/
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static
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struct sk_buff *wimax_gnl_re_state_change_alloc(
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struct wimax_dev *wimax_dev,
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enum wimax_st new_state, enum wimax_st old_state,
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void **header)
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{
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int result;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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void *data;
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struct sk_buff *report_skb;
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d_fnstart(3, dev, "(wimax_dev %p new_state %u old_state %u)\n",
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wimax_dev, new_state, old_state);
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result = -ENOMEM;
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report_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (report_skb == NULL) {
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dev_err(dev, "RE_STCH: can't create message\n");
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goto error_new;
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}
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data = genlmsg_put(report_skb, 0, wimax_gnl_mcg.id, &wimax_gnl_family,
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0, WIMAX_GNL_RE_STATE_CHANGE);
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if (data == NULL) {
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dev_err(dev, "RE_STCH: can't put data into message\n");
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goto error_put;
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}
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*header = data;
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result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_OLD, old_state);
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if (result < 0) {
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dev_err(dev, "RE_STCH: Error adding OLD attr: %d\n", result);
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goto error_put;
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}
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result = nla_put_u8(report_skb, WIMAX_GNL_STCH_STATE_NEW, new_state);
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if (result < 0) {
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dev_err(dev, "RE_STCH: Error adding NEW attr: %d\n", result);
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goto error_put;
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}
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result = nla_put_u32(report_skb, WIMAX_GNL_STCH_IFIDX,
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wimax_dev->net_dev->ifindex);
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if (result < 0) {
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dev_err(dev, "RE_STCH: Error adding IFINDEX attribute\n");
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goto error_put;
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}
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d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %p\n",
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wimax_dev, new_state, old_state, report_skb);
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return report_skb;
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error_put:
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nlmsg_free(report_skb);
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error_new:
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d_fnend(3, dev, "(wimax_dev %p new_state %u old_state %u) = %d\n",
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wimax_dev, new_state, old_state, result);
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return ERR_PTR(result);
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}
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/*
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* Send a Report State Change message (as created with _alloc).
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*
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* @report_skb: as returned by wimax_gnl_re_state_change_alloc()
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* @header: as returned by wimax_gnl_re_state_change_alloc()
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*
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* Returns: 0 if ok, < 0 errno code on error.
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*
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* If the message is NULL, pretend it didn't happen.
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*/
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static
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int wimax_gnl_re_state_change_send(
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struct wimax_dev *wimax_dev, struct sk_buff *report_skb,
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void *header)
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{
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int result = 0;
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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d_fnstart(3, dev, "(wimax_dev %p report_skb %p)\n",
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wimax_dev, report_skb);
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if (report_skb == NULL) {
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result = -ENOMEM;
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goto out;
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}
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genlmsg_end(report_skb, header);
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genlmsg_multicast(report_skb, 0, wimax_gnl_mcg.id, GFP_KERNEL);
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out:
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d_fnend(3, dev, "(wimax_dev %p report_skb %p) = %d\n",
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wimax_dev, report_skb, result);
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return result;
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}
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static
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void __check_new_state(enum wimax_st old_state, enum wimax_st new_state,
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unsigned allowed_states_bm)
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{
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if (WARN_ON(((1 << new_state) & allowed_states_bm) == 0)) {
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printk(KERN_ERR "SW BUG! Forbidden state change %u -> %u\n",
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old_state, new_state);
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}
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}
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/*
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* Set the current state of a WiMAX device [unlocking version of
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* wimax_state_change().
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*/
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void __wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
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{
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struct device *dev = wimax_dev_to_dev(wimax_dev);
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enum wimax_st old_state = wimax_dev->state;
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struct sk_buff *stch_skb;
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void *header;
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d_fnstart(3, dev, "(wimax_dev %p new_state %u [old %u])\n",
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wimax_dev, new_state, old_state);
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if (WARN_ON(new_state >= __WIMAX_ST_INVALID)) {
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dev_err(dev, "SW BUG: requesting invalid state %u\n",
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new_state);
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goto out;
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}
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if (old_state == new_state)
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goto out;
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header = NULL; /* gcc complains? can't grok why */
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stch_skb = wimax_gnl_re_state_change_alloc(
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wimax_dev, new_state, old_state, &header);
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/* Verify the state transition and do exit-from-state actions */
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switch (old_state) {
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case __WIMAX_ST_NULL:
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__check_new_state(old_state, new_state,
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1 << WIMAX_ST_DOWN);
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break;
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case WIMAX_ST_DOWN:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_UNINITIALIZED
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| 1 << WIMAX_ST_RADIO_OFF);
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break;
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case __WIMAX_ST_QUIESCING:
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__check_new_state(old_state, new_state, 1 << WIMAX_ST_DOWN);
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break;
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case WIMAX_ST_UNINITIALIZED:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_RADIO_OFF);
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break;
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case WIMAX_ST_RADIO_OFF:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_READY);
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break;
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case WIMAX_ST_READY:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_RADIO_OFF
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| 1 << WIMAX_ST_SCANNING
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| 1 << WIMAX_ST_CONNECTING
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| 1 << WIMAX_ST_CONNECTED);
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break;
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case WIMAX_ST_SCANNING:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_RADIO_OFF
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| 1 << WIMAX_ST_READY
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| 1 << WIMAX_ST_CONNECTING
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| 1 << WIMAX_ST_CONNECTED);
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break;
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case WIMAX_ST_CONNECTING:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_RADIO_OFF
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| 1 << WIMAX_ST_READY
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| 1 << WIMAX_ST_SCANNING
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| 1 << WIMAX_ST_CONNECTED);
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break;
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case WIMAX_ST_CONNECTED:
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__check_new_state(old_state, new_state,
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1 << __WIMAX_ST_QUIESCING
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| 1 << WIMAX_ST_RADIO_OFF
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| 1 << WIMAX_ST_READY);
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netif_tx_disable(wimax_dev->net_dev);
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netif_carrier_off(wimax_dev->net_dev);
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break;
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case __WIMAX_ST_INVALID:
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default:
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dev_err(dev, "SW BUG: wimax_dev %p is in unknown state %u\n",
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wimax_dev, wimax_dev->state);
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WARN_ON(1);
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goto out;
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}
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/* Execute the actions of entry to the new state */
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switch (new_state) {
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case __WIMAX_ST_NULL:
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dev_err(dev, "SW BUG: wimax_dev %p entering NULL state "
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"from %u\n", wimax_dev, wimax_dev->state);
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WARN_ON(1); /* Nobody can enter this state */
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break;
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case WIMAX_ST_DOWN:
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break;
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case __WIMAX_ST_QUIESCING:
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break;
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case WIMAX_ST_UNINITIALIZED:
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break;
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case WIMAX_ST_RADIO_OFF:
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break;
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case WIMAX_ST_READY:
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break;
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case WIMAX_ST_SCANNING:
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break;
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case WIMAX_ST_CONNECTING:
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break;
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case WIMAX_ST_CONNECTED:
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netif_carrier_on(wimax_dev->net_dev);
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netif_wake_queue(wimax_dev->net_dev);
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break;
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case __WIMAX_ST_INVALID:
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default:
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BUG();
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}
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__wimax_state_set(wimax_dev, new_state);
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if (stch_skb)
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wimax_gnl_re_state_change_send(wimax_dev, stch_skb, header);
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out:
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d_fnend(3, dev, "(wimax_dev %p new_state %u [old %u]) = void\n",
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wimax_dev, new_state, old_state);
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return;
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}
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/**
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* wimax_state_change - Set the current state of a WiMAX device
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*
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* @wimax_dev: WiMAX device descriptor (properly referenced)
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* @new_state: New state to switch to
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*
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* This implements the state changes for the wimax devices. It will
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*
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* - verify that the state transition is legal (for now it'll just
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* print a warning if not) according to the table in
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* linux/wimax.h's documentation for 'enum wimax_st'.
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*
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* - perform the actions needed for leaving the current state and
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* whichever are needed for entering the new state.
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*
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* - issue a report to user space indicating the new state (and an
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* optional payload with information about the new state).
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*
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* NOTE: @wimax_dev must be locked
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*/
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void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
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{
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/*
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* A driver cannot take the wimax_dev out of the
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* __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
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* the wimax_dev's state is still NULL, we ignore any request
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* to change its state because it means it hasn't been yet
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* registered.
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*
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* There is no need to complain about it, as routines that
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* call this might be shared from different code paths that
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* are called before or after wimax_dev_add() has done its
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* job.
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*/
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mutex_lock(&wimax_dev->mutex);
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if (wimax_dev->state > __WIMAX_ST_NULL)
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__wimax_state_change(wimax_dev, new_state);
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mutex_unlock(&wimax_dev->mutex);
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return;
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}
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EXPORT_SYMBOL_GPL(wimax_state_change);
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/**
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* wimax_state_get() - Return the current state of a WiMAX device
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*
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* @wimax_dev: WiMAX device descriptor
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*
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* Returns: Current state of the device according to its driver.
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*/
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enum wimax_st wimax_state_get(struct wimax_dev *wimax_dev)
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{
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enum wimax_st state;
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mutex_lock(&wimax_dev->mutex);
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state = wimax_dev->state;
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mutex_unlock(&wimax_dev->mutex);
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return state;
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}
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EXPORT_SYMBOL_GPL(wimax_state_get);
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/**
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* wimax_dev_init - initialize a newly allocated instance
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*
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* @wimax_dev: WiMAX device descriptor to initialize.
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*
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* Initializes fields of a freshly allocated @wimax_dev instance. This
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* function assumes that after allocation, the memory occupied by
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* @wimax_dev was zeroed.
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*/
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void wimax_dev_init(struct wimax_dev *wimax_dev)
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{
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INIT_LIST_HEAD(&wimax_dev->id_table_node);
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__wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
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mutex_init(&wimax_dev->mutex);
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mutex_init(&wimax_dev->mutex_reset);
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}
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EXPORT_SYMBOL_GPL(wimax_dev_init);
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/*
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* This extern is declared here because it's easier to keep track --
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* both declarations are a list of the same
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*/
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extern struct genl_ops
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wimax_gnl_msg_from_user,
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wimax_gnl_reset,
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wimax_gnl_rfkill,
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wimax_gnl_state_get;
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static
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struct genl_ops *wimax_gnl_ops[] = {
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&wimax_gnl_msg_from_user,
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&wimax_gnl_reset,
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&wimax_gnl_rfkill,
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&wimax_gnl_state_get,
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};
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static
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size_t wimax_addr_scnprint(char *addr_str, size_t addr_str_size,
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unsigned char *addr, size_t addr_len)
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{
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unsigned cnt, total;
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for (total = cnt = 0; cnt < addr_len; cnt++)
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total += scnprintf(addr_str + total, addr_str_size - total,
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"%02x%c", addr[cnt],
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cnt == addr_len - 1 ? '\0' : ':');
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return total;
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}
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/**
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* wimax_dev_add - Register a new WiMAX device
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*
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* @wimax_dev: WiMAX device descriptor (as embedded in your @net_dev's
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* priv data). You must have called wimax_dev_init() on it before.
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*
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* @net_dev: net device the @wimax_dev is associated with. The
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* function expects SET_NETDEV_DEV() and register_netdev() were
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* already called on it.
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*
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* Registers the new WiMAX device, sets up the user-kernel control
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* interface (generic netlink) and common WiMAX infrastructure.
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*
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* Note that the parts that will allow interaction with user space are
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* setup at the very end, when the rest is in place, as once that
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* happens, the driver might get user space control requests via
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* netlink or from debugfs that might translate into calls into
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* wimax_dev->op_*().
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*/
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int wimax_dev_add(struct wimax_dev *wimax_dev, struct net_device *net_dev)
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{
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int result;
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struct device *dev = net_dev->dev.parent;
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char addr_str[32];
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d_fnstart(3, dev, "(wimax_dev %p net_dev %p)\n", wimax_dev, net_dev);
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|
/* Do the RFKILL setup before locking, as RFKILL will call
|
|
* into our functions. */
|
|
wimax_dev->net_dev = net_dev;
|
|
result = wimax_rfkill_add(wimax_dev);
|
|
if (result < 0)
|
|
goto error_rfkill_add;
|
|
|
|
/* Set up user-space interaction */
|
|
mutex_lock(&wimax_dev->mutex);
|
|
wimax_id_table_add(wimax_dev);
|
|
result = wimax_debugfs_add(wimax_dev);
|
|
if (result < 0) {
|
|
dev_err(dev, "cannot initialize debugfs: %d\n",
|
|
result);
|
|
goto error_debugfs_add;
|
|
}
|
|
|
|
__wimax_state_set(wimax_dev, WIMAX_ST_DOWN);
|
|
mutex_unlock(&wimax_dev->mutex);
|
|
|
|
wimax_addr_scnprint(addr_str, sizeof(addr_str),
|
|
net_dev->dev_addr, net_dev->addr_len);
|
|
dev_err(dev, "WiMAX interface %s (%s) ready\n",
|
|
net_dev->name, addr_str);
|
|
d_fnend(3, dev, "(wimax_dev %p net_dev %p) = 0\n", wimax_dev, net_dev);
|
|
return 0;
|
|
|
|
error_debugfs_add:
|
|
wimax_id_table_rm(wimax_dev);
|
|
mutex_unlock(&wimax_dev->mutex);
|
|
wimax_rfkill_rm(wimax_dev);
|
|
error_rfkill_add:
|
|
d_fnend(3, dev, "(wimax_dev %p net_dev %p) = %d\n",
|
|
wimax_dev, net_dev, result);
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wimax_dev_add);
|
|
|
|
|
|
/**
|
|
* wimax_dev_rm - Unregister an existing WiMAX device
|
|
*
|
|
* @wimax_dev: WiMAX device descriptor
|
|
*
|
|
* Unregisters a WiMAX device previously registered for use with
|
|
* wimax_add_rm().
|
|
*
|
|
* IMPORTANT! Must call before calling unregister_netdev().
|
|
*
|
|
* After this function returns, you will not get any more user space
|
|
* control requests (via netlink or debugfs) and thus to wimax_dev->ops.
|
|
*
|
|
* Reentrancy control is ensured by setting the state to
|
|
* %__WIMAX_ST_QUIESCING. rfkill operations coming through
|
|
* wimax_*rfkill*() will be stopped by the quiescing state; ops coming
|
|
* from the rfkill subsystem will be stopped by the support being
|
|
* removed by wimax_rfkill_rm().
|
|
*/
|
|
void wimax_dev_rm(struct wimax_dev *wimax_dev)
|
|
{
|
|
d_fnstart(3, NULL, "(wimax_dev %p)\n", wimax_dev);
|
|
|
|
mutex_lock(&wimax_dev->mutex);
|
|
__wimax_state_change(wimax_dev, __WIMAX_ST_QUIESCING);
|
|
wimax_debugfs_rm(wimax_dev);
|
|
wimax_id_table_rm(wimax_dev);
|
|
__wimax_state_change(wimax_dev, WIMAX_ST_DOWN);
|
|
mutex_unlock(&wimax_dev->mutex);
|
|
wimax_rfkill_rm(wimax_dev);
|
|
d_fnend(3, NULL, "(wimax_dev %p) = void\n", wimax_dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(wimax_dev_rm);
|
|
|
|
|
|
/* Debug framework control of debug levels */
|
|
struct d_level D_LEVEL[] = {
|
|
D_SUBMODULE_DEFINE(debugfs),
|
|
D_SUBMODULE_DEFINE(id_table),
|
|
D_SUBMODULE_DEFINE(op_msg),
|
|
D_SUBMODULE_DEFINE(op_reset),
|
|
D_SUBMODULE_DEFINE(op_rfkill),
|
|
D_SUBMODULE_DEFINE(op_state_get),
|
|
D_SUBMODULE_DEFINE(stack),
|
|
};
|
|
size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
|
|
|
|
|
|
struct genl_family wimax_gnl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = "WiMAX",
|
|
.version = WIMAX_GNL_VERSION,
|
|
.hdrsize = 0,
|
|
.maxattr = WIMAX_GNL_ATTR_MAX,
|
|
};
|
|
|
|
struct genl_multicast_group wimax_gnl_mcg = {
|
|
.name = "msg",
|
|
};
|
|
|
|
|
|
|
|
/* Shutdown the wimax stack */
|
|
static
|
|
int __init wimax_subsys_init(void)
|
|
{
|
|
int result, cnt;
|
|
|
|
d_fnstart(4, NULL, "()\n");
|
|
d_parse_params(D_LEVEL, D_LEVEL_SIZE, wimax_debug_params,
|
|
"wimax.debug");
|
|
|
|
snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
|
|
"WiMAX");
|
|
result = genl_register_family(&wimax_gnl_family);
|
|
if (unlikely(result < 0)) {
|
|
printk(KERN_ERR "cannot register generic netlink family: %d\n",
|
|
result);
|
|
goto error_register_family;
|
|
}
|
|
|
|
for (cnt = 0; cnt < ARRAY_SIZE(wimax_gnl_ops); cnt++) {
|
|
result = genl_register_ops(&wimax_gnl_family,
|
|
wimax_gnl_ops[cnt]);
|
|
d_printf(4, NULL, "registering generic netlink op code "
|
|
"%u: %d\n", wimax_gnl_ops[cnt]->cmd, result);
|
|
if (unlikely(result < 0)) {
|
|
printk(KERN_ERR "cannot register generic netlink op "
|
|
"code %u: %d\n",
|
|
wimax_gnl_ops[cnt]->cmd, result);
|
|
goto error_register_ops;
|
|
}
|
|
}
|
|
|
|
result = genl_register_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
|
|
if (result < 0)
|
|
goto error_mc_group;
|
|
d_fnend(4, NULL, "() = 0\n");
|
|
return 0;
|
|
|
|
error_mc_group:
|
|
error_register_ops:
|
|
for (cnt--; cnt >= 0; cnt--)
|
|
genl_unregister_ops(&wimax_gnl_family,
|
|
wimax_gnl_ops[cnt]);
|
|
genl_unregister_family(&wimax_gnl_family);
|
|
error_register_family:
|
|
d_fnend(4, NULL, "() = %d\n", result);
|
|
return result;
|
|
|
|
}
|
|
module_init(wimax_subsys_init);
|
|
|
|
|
|
/* Shutdown the wimax stack */
|
|
static
|
|
void __exit wimax_subsys_exit(void)
|
|
{
|
|
int cnt;
|
|
wimax_id_table_release();
|
|
genl_unregister_mc_group(&wimax_gnl_family, &wimax_gnl_mcg);
|
|
for (cnt = ARRAY_SIZE(wimax_gnl_ops) - 1; cnt >= 0; cnt--)
|
|
genl_unregister_ops(&wimax_gnl_family,
|
|
wimax_gnl_ops[cnt]);
|
|
genl_unregister_family(&wimax_gnl_family);
|
|
}
|
|
module_exit(wimax_subsys_exit);
|
|
|
|
MODULE_AUTHOR("Intel Corporation <linux-wimax@intel.com>");
|
|
MODULE_DESCRIPTION("Linux WiMAX stack");
|
|
MODULE_LICENSE("GPL");
|
|
|