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![Thomas Pugliese](/assets/img/avatar_default.png)
Fix variable set but not used warnings in UWB. Signed-off-by: Thomas Pugliese <thomas.pugliese@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
609 lines
16 KiB
C
609 lines
16 KiB
C
/*
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* Ultra Wide Band
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* Beacon management
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*
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* Copyright (C) 2005-2006 Intel Corporation
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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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* FIXME: docs
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kdev_t.h>
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#include <linux/slab.h>
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#include "uwb-internal.h"
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/* Start Beaconing command structure */
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struct uwb_rc_cmd_start_beacon {
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struct uwb_rccb rccb;
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__le16 wBPSTOffset;
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u8 bChannelNumber;
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} __attribute__((packed));
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static int uwb_rc_start_beacon(struct uwb_rc *rc, u16 bpst_offset, u8 channel)
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{
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int result;
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struct uwb_rc_cmd_start_beacon *cmd;
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struct uwb_rc_evt_confirm reply;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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return -ENOMEM;
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cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
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cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_START_BEACON);
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cmd->wBPSTOffset = cpu_to_le16(bpst_offset);
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cmd->bChannelNumber = channel;
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reply.rceb.bEventType = UWB_RC_CET_GENERAL;
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reply.rceb.wEvent = UWB_RC_CMD_START_BEACON;
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result = uwb_rc_cmd(rc, "START-BEACON", &cmd->rccb, sizeof(*cmd),
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&reply.rceb, sizeof(reply));
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if (result < 0)
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goto error_cmd;
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if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
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dev_err(&rc->uwb_dev.dev,
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"START-BEACON: command execution failed: %s (%d)\n",
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uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
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result = -EIO;
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}
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error_cmd:
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kfree(cmd);
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return result;
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}
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static int uwb_rc_stop_beacon(struct uwb_rc *rc)
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{
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int result;
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struct uwb_rccb *cmd;
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struct uwb_rc_evt_confirm reply;
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cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
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if (cmd == NULL)
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return -ENOMEM;
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cmd->bCommandType = UWB_RC_CET_GENERAL;
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cmd->wCommand = cpu_to_le16(UWB_RC_CMD_STOP_BEACON);
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reply.rceb.bEventType = UWB_RC_CET_GENERAL;
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reply.rceb.wEvent = UWB_RC_CMD_STOP_BEACON;
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result = uwb_rc_cmd(rc, "STOP-BEACON", cmd, sizeof(*cmd),
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&reply.rceb, sizeof(reply));
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if (result < 0)
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goto error_cmd;
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if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
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dev_err(&rc->uwb_dev.dev,
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"STOP-BEACON: command execution failed: %s (%d)\n",
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uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
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result = -EIO;
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}
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error_cmd:
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kfree(cmd);
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return result;
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}
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/*
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* Start/stop beacons
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*
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* @rc: UWB Radio Controller to operate on
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* @channel: UWB channel on which to beacon (WUSB[table
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* 5-12]). If -1, stop beaconing.
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* @bpst_offset: Beacon Period Start Time offset; FIXME-do zero
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*
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* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
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* of a SET IE command after the device sent the first beacon that includes
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* the IEs specified in the SET IE command. So, after we start beaconing we
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* check if there is anything in the IE cache and call the SET IE command
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* if needed.
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*/
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int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset)
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{
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int result;
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struct device *dev = &rc->uwb_dev.dev;
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dev_dbg(dev, "%s: channel = %d\n", __func__, channel);
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if (channel < 0)
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channel = -1;
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if (channel == -1)
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result = uwb_rc_stop_beacon(rc);
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else {
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/* channel >= 0...dah */
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result = uwb_rc_start_beacon(rc, bpst_offset, channel);
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if (result < 0) {
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dev_err(dev, "Cannot start beaconing: %d\n", result);
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return result;
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}
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if (le16_to_cpu(rc->ies->wIELength) > 0) {
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result = uwb_rc_set_ie(rc, rc->ies);
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if (result < 0) {
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dev_err(dev, "Cannot set new IE on device: "
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"%d\n", result);
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result = uwb_rc_stop_beacon(rc);
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channel = -1;
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bpst_offset = 0;
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}
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}
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}
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if (result >= 0)
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rc->beaconing = channel;
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return result;
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}
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/*
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* Beacon cache
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*
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* The purpose of this is to speed up the lookup of becon information
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* when a new beacon arrives. The UWB Daemon uses it also to keep a
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* tab of which devices are in radio distance and which not. When a
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* device's beacon stays present for more than a certain amount of
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* time, it is considered a new, usable device. When a beacon ceases
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* to be received for a certain amount of time, it is considered that
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* the device is gone.
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*
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* FIXME: use an allocator for the entries
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* FIXME: use something faster for search than a list
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*/
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void uwb_bce_kfree(struct kref *_bce)
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{
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struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt);
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kfree(bce->be);
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kfree(bce);
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}
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/* Find a beacon by dev addr in the cache */
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static
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struct uwb_beca_e *__uwb_beca_find_bydev(struct uwb_rc *rc,
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const struct uwb_dev_addr *dev_addr)
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{
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struct uwb_beca_e *bce, *next;
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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if (!memcmp(&bce->dev_addr, dev_addr, sizeof(bce->dev_addr)))
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goto out;
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}
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bce = NULL;
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out:
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return bce;
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}
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/* Find a beacon by dev addr in the cache */
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static
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struct uwb_beca_e *__uwb_beca_find_bymac(struct uwb_rc *rc,
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const struct uwb_mac_addr *mac_addr)
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{
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struct uwb_beca_e *bce, *next;
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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if (!memcmp(bce->mac_addr, mac_addr->data,
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sizeof(struct uwb_mac_addr)))
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goto out;
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}
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bce = NULL;
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out:
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return bce;
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}
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/**
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* uwb_dev_get_by_devaddr - get a UWB device with a specific DevAddr
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* @rc: the radio controller that saw the device
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* @devaddr: DevAddr of the UWB device to find
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*
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* There may be more than one matching device (in the case of a
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* DevAddr conflict), but only the first one is returned.
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*/
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struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
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const struct uwb_dev_addr *devaddr)
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{
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struct uwb_dev *found = NULL;
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struct uwb_beca_e *bce;
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bydev(rc, devaddr);
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if (bce)
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found = uwb_dev_try_get(rc, bce->uwb_dev);
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mutex_unlock(&rc->uwb_beca.mutex);
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return found;
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}
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/**
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* uwb_dev_get_by_macaddr - get a UWB device with a specific EUI-48
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* @rc: the radio controller that saw the device
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* @devaddr: EUI-48 of the UWB device to find
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*/
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struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
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const struct uwb_mac_addr *macaddr)
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{
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struct uwb_dev *found = NULL;
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struct uwb_beca_e *bce;
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(rc, macaddr);
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if (bce)
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found = uwb_dev_try_get(rc, bce->uwb_dev);
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mutex_unlock(&rc->uwb_beca.mutex);
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return found;
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}
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/* Initialize a beacon cache entry */
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static void uwb_beca_e_init(struct uwb_beca_e *bce)
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{
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mutex_init(&bce->mutex);
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kref_init(&bce->refcnt);
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stats_init(&bce->lqe_stats);
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stats_init(&bce->rssi_stats);
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}
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/*
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* Add a beacon to the cache
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*
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* @be: Beacon event information
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* @bf: Beacon frame (part of b, really)
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* @ts_jiffies: Timestamp (in jiffies) when the beacon was received
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*/
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static
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struct uwb_beca_e *__uwb_beca_add(struct uwb_rc *rc,
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struct uwb_rc_evt_beacon *be,
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struct uwb_beacon_frame *bf,
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unsigned long ts_jiffies)
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{
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struct uwb_beca_e *bce;
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bce = kzalloc(sizeof(*bce), GFP_KERNEL);
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if (bce == NULL)
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return NULL;
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uwb_beca_e_init(bce);
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bce->ts_jiffies = ts_jiffies;
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bce->uwb_dev = NULL;
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list_add(&bce->node, &rc->uwb_beca.list);
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return bce;
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}
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/*
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* Wipe out beacon entries that became stale
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*
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* Remove associated devicest too.
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*/
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void uwb_beca_purge(struct uwb_rc *rc)
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{
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struct uwb_beca_e *bce, *next;
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unsigned long expires;
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mutex_lock(&rc->uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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expires = bce->ts_jiffies + msecs_to_jiffies(beacon_timeout_ms);
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if (time_after(jiffies, expires)) {
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uwbd_dev_offair(bce);
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}
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}
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mutex_unlock(&rc->uwb_beca.mutex);
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}
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/* Clean up the whole beacon cache. Called on shutdown */
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void uwb_beca_release(struct uwb_rc *rc)
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{
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struct uwb_beca_e *bce, *next;
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mutex_lock(&rc->uwb_beca.mutex);
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list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) {
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list_del(&bce->node);
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uwb_bce_put(bce);
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}
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mutex_unlock(&rc->uwb_beca.mutex);
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}
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static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be,
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struct uwb_beacon_frame *bf)
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{
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char macbuf[UWB_ADDR_STRSIZE];
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char devbuf[UWB_ADDR_STRSIZE];
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char dstbuf[UWB_ADDR_STRSIZE];
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uwb_mac_addr_print(macbuf, sizeof(macbuf), &bf->Device_Identifier);
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uwb_dev_addr_print(devbuf, sizeof(devbuf), &bf->hdr.SrcAddr);
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uwb_dev_addr_print(dstbuf, sizeof(dstbuf), &bf->hdr.DestAddr);
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dev_info(&rc->uwb_dev.dev,
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"BEACON from %s to %s (ch%u offset %u slot %u MAC %s)\n",
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devbuf, dstbuf, be->bChannelNumber, be->wBPSTOffset,
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bf->Beacon_Slot_Number, macbuf);
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}
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/*
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* @bce: beacon cache entry, referenced
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*/
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ssize_t uwb_bce_print_IEs(struct uwb_dev *uwb_dev, struct uwb_beca_e *bce,
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char *buf, size_t size)
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{
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ssize_t result = 0;
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struct uwb_rc_evt_beacon *be;
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struct uwb_beacon_frame *bf;
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int ies_len;
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struct uwb_ie_hdr *ies;
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mutex_lock(&bce->mutex);
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be = bce->be;
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if (be) {
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bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
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ies_len = be->wBeaconInfoLength - sizeof(struct uwb_beacon_frame);
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ies = (struct uwb_ie_hdr *)bf->IEData;
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result = uwb_ie_dump_hex(ies, ies_len, buf, size);
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}
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mutex_unlock(&bce->mutex);
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return result;
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}
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/*
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* Verify that the beacon event, frame and IEs are ok
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*/
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static int uwb_verify_beacon(struct uwb_rc *rc, struct uwb_event *evt,
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struct uwb_rc_evt_beacon *be)
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{
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int result = -EINVAL;
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struct uwb_beacon_frame *bf;
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struct device *dev = &rc->uwb_dev.dev;
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/* Is there enough data to decode a beacon frame? */
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if (evt->notif.size < sizeof(*be) + sizeof(*bf)) {
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dev_err(dev, "BEACON event: Not enough data to decode "
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"(%zu vs %zu bytes needed)\n", evt->notif.size,
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sizeof(*be) + sizeof(*bf));
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goto error;
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}
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/* FIXME: make sure beacon frame IEs are fine and that the whole thing
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* is consistent */
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result = 0;
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error:
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return result;
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}
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/*
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* Handle UWB_RC_EVT_BEACON events
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*
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* We check the beacon cache to see how the received beacon fares. If
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* is there already we refresh the timestamp. If not we create a new
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* entry.
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*
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* According to the WHCI and WUSB specs, only one beacon frame is
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* allowed per notification block, so we don't bother about scanning
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* for more.
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*/
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int uwbd_evt_handle_rc_beacon(struct uwb_event *evt)
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{
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int result = -EINVAL;
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struct uwb_rc *rc;
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struct uwb_rc_evt_beacon *be;
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struct uwb_beacon_frame *bf;
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struct uwb_beca_e *bce;
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rc = evt->rc;
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be = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon, rceb);
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result = uwb_verify_beacon(rc, evt, be);
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if (result < 0)
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return result;
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/* FIXME: handle alien beacons. */
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if (be->bBeaconType == UWB_RC_BEACON_TYPE_OL_ALIEN ||
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be->bBeaconType == UWB_RC_BEACON_TYPE_NOL_ALIEN) {
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return -ENOSYS;
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}
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bf = (struct uwb_beacon_frame *) be->BeaconInfo;
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/*
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* Drop beacons from devices with a NULL EUI-48 -- they cannot
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* be uniquely identified.
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*
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* It's expected that these will all be WUSB devices and they
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* have a WUSB specific connection method so ignoring them
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* here shouldn't be a problem.
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*/
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if (uwb_mac_addr_bcast(&bf->Device_Identifier))
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return 0;
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mutex_lock(&rc->uwb_beca.mutex);
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bce = __uwb_beca_find_bymac(rc, &bf->Device_Identifier);
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if (bce == NULL) {
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/* Not in there, a new device is pinging */
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uwb_beacon_print(evt->rc, be, bf);
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bce = __uwb_beca_add(rc, be, bf, evt->ts_jiffies);
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if (bce == NULL) {
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mutex_unlock(&rc->uwb_beca.mutex);
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return -ENOMEM;
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}
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}
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mutex_unlock(&rc->uwb_beca.mutex);
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mutex_lock(&bce->mutex);
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/* purge old beacon data */
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kfree(bce->be);
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/* Update commonly used fields */
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bce->ts_jiffies = evt->ts_jiffies;
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bce->be = be;
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bce->dev_addr = bf->hdr.SrcAddr;
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bce->mac_addr = &bf->Device_Identifier;
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be->wBPSTOffset = le16_to_cpu(be->wBPSTOffset);
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be->wBeaconInfoLength = le16_to_cpu(be->wBeaconInfoLength);
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stats_add_sample(&bce->lqe_stats, be->bLQI - 7);
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stats_add_sample(&bce->rssi_stats, be->bRSSI + 18);
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/*
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* This might be a beacon from a new device.
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*/
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if (bce->uwb_dev == NULL)
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uwbd_dev_onair(evt->rc, bce);
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mutex_unlock(&bce->mutex);
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return 1; /* we keep the event data */
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}
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/*
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* Handle UWB_RC_EVT_BEACON_SIZE events
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*
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* XXXXX
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*/
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int uwbd_evt_handle_rc_beacon_size(struct uwb_event *evt)
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{
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int result = -EINVAL;
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struct device *dev = &evt->rc->uwb_dev.dev;
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|
struct uwb_rc_evt_beacon_size *bs;
|
|
|
|
/* Is there enough data to decode the event? */
|
|
if (evt->notif.size < sizeof(*bs)) {
|
|
dev_err(dev, "BEACON SIZE notification: Not enough data to "
|
|
"decode (%zu vs %zu bytes needed)\n",
|
|
evt->notif.size, sizeof(*bs));
|
|
goto error;
|
|
}
|
|
bs = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon_size, rceb);
|
|
if (0)
|
|
dev_info(dev, "Beacon size changed to %u bytes "
|
|
"(FIXME: action?)\n", le16_to_cpu(bs->wNewBeaconSize));
|
|
else {
|
|
/* temporary hack until we do something with this message... */
|
|
static unsigned count;
|
|
if (++count % 1000 == 0)
|
|
dev_info(dev, "Beacon size changed %u times "
|
|
"(FIXME: action?)\n", count);
|
|
}
|
|
result = 0;
|
|
error:
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* uwbd_evt_handle_rc_bp_slot_change - handle a BP_SLOT_CHANGE event
|
|
* @evt: the BP_SLOT_CHANGE notification from the radio controller
|
|
*
|
|
* If the event indicates that no beacon period slots were available
|
|
* then radio controller has transitioned to a non-beaconing state.
|
|
* Otherwise, simply save the current beacon slot.
|
|
*/
|
|
int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *evt)
|
|
{
|
|
struct uwb_rc *rc = evt->rc;
|
|
struct device *dev = &rc->uwb_dev.dev;
|
|
struct uwb_rc_evt_bp_slot_change *bpsc;
|
|
|
|
if (evt->notif.size < sizeof(*bpsc)) {
|
|
dev_err(dev, "BP SLOT CHANGE event: Not enough data\n");
|
|
return -EINVAL;
|
|
}
|
|
bpsc = container_of(evt->notif.rceb, struct uwb_rc_evt_bp_slot_change, rceb);
|
|
|
|
if (uwb_rc_evt_bp_slot_change_no_slot(bpsc)) {
|
|
dev_err(dev, "stopped beaconing: No free slots in BP\n");
|
|
mutex_lock(&rc->uwb_dev.mutex);
|
|
rc->beaconing = -1;
|
|
mutex_unlock(&rc->uwb_dev.mutex);
|
|
} else
|
|
rc->uwb_dev.beacon_slot = uwb_rc_evt_bp_slot_change_slot_num(bpsc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Handle UWB_RC_EVT_BPOIE_CHANGE events
|
|
*
|
|
* XXXXX
|
|
*/
|
|
struct uwb_ie_bpo {
|
|
struct uwb_ie_hdr hdr;
|
|
u8 bp_length;
|
|
u8 data[];
|
|
} __attribute__((packed));
|
|
|
|
int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *evt)
|
|
{
|
|
int result = -EINVAL;
|
|
struct device *dev = &evt->rc->uwb_dev.dev;
|
|
struct uwb_rc_evt_bpoie_change *bpoiec;
|
|
struct uwb_ie_bpo *bpoie;
|
|
static unsigned count; /* FIXME: this is a temp hack */
|
|
size_t iesize;
|
|
|
|
/* Is there enough data to decode it? */
|
|
if (evt->notif.size < sizeof(*bpoiec)) {
|
|
dev_err(dev, "BPOIEC notification: Not enough data to "
|
|
"decode (%zu vs %zu bytes needed)\n",
|
|
evt->notif.size, sizeof(*bpoiec));
|
|
goto error;
|
|
}
|
|
bpoiec = container_of(evt->notif.rceb, struct uwb_rc_evt_bpoie_change, rceb);
|
|
iesize = le16_to_cpu(bpoiec->wBPOIELength);
|
|
if (iesize < sizeof(*bpoie)) {
|
|
dev_err(dev, "BPOIEC notification: Not enough IE data to "
|
|
"decode (%zu vs %zu bytes needed)\n",
|
|
iesize, sizeof(*bpoie));
|
|
goto error;
|
|
}
|
|
if (++count % 1000 == 0) /* Lame placeholder */
|
|
dev_info(dev, "BPOIE: %u changes received\n", count);
|
|
/*
|
|
* FIXME: At this point we should go over all the IEs in the
|
|
* bpoiec->BPOIE array and act on each.
|
|
*/
|
|
result = 0;
|
|
error:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Print beaconing state.
|
|
*/
|
|
static ssize_t uwb_rc_beacon_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
|
|
struct uwb_rc *rc = uwb_dev->rc;
|
|
ssize_t result;
|
|
|
|
mutex_lock(&rc->uwb_dev.mutex);
|
|
result = sprintf(buf, "%d\n", rc->beaconing);
|
|
mutex_unlock(&rc->uwb_dev.mutex);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Start beaconing on the specified channel, or stop beaconing.
|
|
*/
|
|
static ssize_t uwb_rc_beacon_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t size)
|
|
{
|
|
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
|
|
struct uwb_rc *rc = uwb_dev->rc;
|
|
int channel;
|
|
ssize_t result = -EINVAL;
|
|
|
|
result = sscanf(buf, "%d", &channel);
|
|
if (result >= 1)
|
|
result = uwb_radio_force_channel(rc, channel);
|
|
|
|
return result < 0 ? result : size;
|
|
}
|
|
DEVICE_ATTR(beacon, S_IRUGO | S_IWUSR, uwb_rc_beacon_show, uwb_rc_beacon_store);
|