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/*
* Linux WiMax
* Export the kernel's WiMAX stack wimaxll_reset() function
*
*
* Copyright (C) 2007-2008 Intel Corporation. All rights reserved.
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <assert.h>
#include <linux/types.h>
#include <netlink/msg.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <wimaxll.h>
#include "internal.h"
#define D_LOCAL 0
#include "debug.h"
/**
* Reset a WiMAX device
*
* \param wmx WiMAX device handle
*
* \return result of the operation.
*
* - 0: wam reset suceeded
* - -ENODEV: warm reset failed and had to resort to a cold/bus
* reset; the device was disconnected from the system and the
* current handle is invalid and should be closed.
* - Any other negative error code: unrecoverable error, shutdown
* and go home
*
* When there is a need to reset the device wimaxll_reset() can be used
* to issue a warm reset. That won't invalidate the existing handles,
* while still moving the device to power on state.
*
* If the device cannot be properly reset, the WiMAX kernel stack may
* fall back to a cold reset, which will most likely disconnect the
* device from the driver (and bus) and reconnect it; that means
* device handles will be invalid from there on. In those cases,
* -ENODEV is returned.
*
* \note This call is synchronous; when success is returned, the
* device has completed its internal reset.
*
* \ingroup device_management
* \internal
*
* This implementation simply marshalls the call to the kernel's
* wimax_reset() and returns it's return code.
*/
int wimaxll_reset(struct wimaxll_handle *wmx)
{
ssize_t result;
struct nl_msg *msg;
d_fnstart(3, wmx, "(wmx %p)\n", wmx);
msg = nlmsg_new();
if (msg == NULL) {
result = errno;
wimaxll_msg(wmx, "E: RESET: cannot allocate generic netlink "
"message: %m\n");
goto error_msg_alloc;
}
if (genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ,
wimaxll_family_id(wmx), 0, 0,
WIMAX_GNL_OP_RESET, WIMAX_GNL_VERSION) == NULL) {
result = -ENOMEM;
wimaxll_msg(wmx, "E: RESET: error preparing message: "
"%d 0x%08x\n", result, result);
goto error_msg_prep;
}
nla_put_u32(msg, WIMAX_GNL_RESET_IFIDX, (__u32) wmx->ifidx);
result = nl_send_auto_complete(wmx->nlh_tx, msg);
if (result < 0) {
wimaxll_msg(wmx, "E: RESET: error sending message: %zd\n",
result);
goto error_msg_send;
}
/* Read the message ACK from netlink */
result = wimaxll_wait_for_ack(wmx);
if (result < 0)
wimaxll_msg(wmx, "E: RESET: operation failed: %zd\n", result);
error_msg_prep:
error_msg_send:
nlmsg_free(msg);
error_msg_alloc:
d_fnend(3, wmx, "(wmx %p) = %d\n", wmx, result);
return result;
}
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