linux/drivers/uwb/ie.c

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/*
* Ultra Wide Band
* Information Element Handling
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* Reinette Chatre <reinette.chatre@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*/
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
#include <linux/slab.h>
#include "uwb-internal.h"
/**
* uwb_ie_next - get the next IE in a buffer
* @ptr: start of the buffer containing the IE data
* @len: length of the buffer
*
* Both @ptr and @len are updated so subsequent calls to uwb_ie_next()
* will get the next IE.
*
* NULL is returned (and @ptr and @len will not be updated) if there
* are no more IEs in the buffer or the buffer is too short.
*/
struct uwb_ie_hdr *uwb_ie_next(void **ptr, size_t *len)
{
struct uwb_ie_hdr *hdr;
size_t ie_len;
if (*len < sizeof(struct uwb_ie_hdr))
return NULL;
hdr = *ptr;
ie_len = sizeof(struct uwb_ie_hdr) + hdr->length;
if (*len < ie_len)
return NULL;
*ptr += ie_len;
*len -= ie_len;
return hdr;
}
EXPORT_SYMBOL_GPL(uwb_ie_next);
/**
* uwb_ie_dump_hex - print IEs to a character buffer
* @ies: the IEs to print.
* @len: length of all the IEs.
* @buf: the destination buffer.
* @size: size of @buf.
*
* Returns the number of characters written.
*/
int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
char *buf, size_t size)
{
void *ptr;
const struct uwb_ie_hdr *ie;
int r = 0;
u8 *d;
ptr = (void *)ies;
for (;;) {
ie = uwb_ie_next(&ptr, &len);
if (!ie)
break;
r += scnprintf(buf + r, size - r, "%02x %02x",
(unsigned)ie->element_id,
(unsigned)ie->length);
d = (uint8_t *)ie + sizeof(struct uwb_ie_hdr);
while (d != ptr && r < size)
r += scnprintf(buf + r, size - r, " %02x", (unsigned)*d++);
if (r < size)
buf[r++] = '\n';
};
return r;
}
/**
* Get the IEs that a radio controller is sending in its beacon
*
* @uwb_rc: UWB Radio Controller
* @returns: Size read from the system
*
* We don't need to lock the uwb_rc's mutex because we don't modify
* anything. Once done with the iedata buffer, call
* uwb_rc_ie_release(iedata). Don't call kfree on it.
*/
static
ssize_t uwb_rc_get_ie(struct uwb_rc *uwb_rc, struct uwb_rc_evt_get_ie **pget_ie)
{
ssize_t result;
struct device *dev = &uwb_rc->uwb_dev.dev;
struct uwb_rccb *cmd = NULL;
struct uwb_rceb *reply = NULL;
struct uwb_rc_evt_get_ie *get_ie;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
return -ENOMEM;
cmd->bCommandType = UWB_RC_CET_GENERAL;
cmd->wCommand = cpu_to_le16(UWB_RC_CMD_GET_IE);
result = uwb_rc_vcmd(uwb_rc, "GET_IE", cmd, sizeof(*cmd),
UWB_RC_CET_GENERAL, UWB_RC_CMD_GET_IE,
&reply);
kfree(cmd);
if (result < 0)
return result;
get_ie = container_of(reply, struct uwb_rc_evt_get_ie, rceb);
if (result < sizeof(*get_ie)) {
dev_err(dev, "not enough data returned for decoding GET IE "
"(%zu bytes received vs %zu needed)\n",
result, sizeof(*get_ie));
return -EINVAL;
} else if (result < sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength)) {
dev_err(dev, "not enough data returned for decoding GET IE "
"payload (%zu bytes received vs %zu needed)\n", result,
sizeof(*get_ie) + le16_to_cpu(get_ie->wIELength));
return -EINVAL;
}
*pget_ie = get_ie;
return result;
}
/**
* Replace all IEs currently being transmitted by a device
*
* @cmd: pointer to the SET-IE command with the IEs to set
* @size: size of @buf
*/
int uwb_rc_set_ie(struct uwb_rc *rc, struct uwb_rc_cmd_set_ie *cmd)
{
int result;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rc_evt_set_ie reply;
reply.rceb.bEventType = UWB_RC_CET_GENERAL;
reply.rceb.wEvent = UWB_RC_CMD_SET_IE;
result = uwb_rc_cmd(rc, "SET-IE", &cmd->rccb,
sizeof(*cmd) + le16_to_cpu(cmd->wIELength),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
else if (result != sizeof(reply)) {
dev_err(dev, "SET-IE: not enough data to decode reply "
"(%d bytes received vs %zu needed)\n",
result, sizeof(reply));
result = -EIO;
} else if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
dev_err(dev, "SET-IE: command execution failed: %s (%d)\n",
uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
result = -EIO;
} else
result = 0;
error_cmd:
return result;
}
/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_init(struct uwb_rc *uwb_rc)
{
mutex_init(&uwb_rc->ies_mutex);
}
/**
* uwb_rc_ie_setup - setup a radio controller's IE manager
* @uwb_rc: the radio controller.
*
* The current set of IEs are obtained from the hardware with a GET-IE
* command (since the radio controller is not yet beaconing this will
* be just the hardware's MAC and PHY Capability IEs).
*
* Returns 0 on success; -ve on an error.
*/
int uwb_rc_ie_setup(struct uwb_rc *uwb_rc)
{
struct uwb_rc_evt_get_ie *ie_info = NULL;
int capacity;
capacity = uwb_rc_get_ie(uwb_rc, &ie_info);
if (capacity < 0)
return capacity;
mutex_lock(&uwb_rc->ies_mutex);
uwb_rc->ies = (struct uwb_rc_cmd_set_ie *)ie_info;
uwb_rc->ies->rccb.bCommandType = UWB_RC_CET_GENERAL;
uwb_rc->ies->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_IE);
uwb_rc->ies_capacity = capacity;
mutex_unlock(&uwb_rc->ies_mutex);
return 0;
}
/* Cleanup the whole IE management subsystem */
void uwb_rc_ie_release(struct uwb_rc *uwb_rc)
{
kfree(uwb_rc->ies);
uwb_rc->ies = NULL;
uwb_rc->ies_capacity = 0;
}
static int uwb_rc_ie_add_one(struct uwb_rc *rc, const struct uwb_ie_hdr *new_ie)
{
struct uwb_rc_cmd_set_ie *new_ies;
void *ptr, *prev_ie;
struct uwb_ie_hdr *ie;
size_t length, new_ie_len, new_capacity, size, prev_size;
length = le16_to_cpu(rc->ies->wIELength);
new_ie_len = sizeof(struct uwb_ie_hdr) + new_ie->length;
new_capacity = sizeof(struct uwb_rc_cmd_set_ie) + length + new_ie_len;
if (new_capacity > rc->ies_capacity) {
new_ies = krealloc(rc->ies, new_capacity, GFP_KERNEL);
if (!new_ies)
return -ENOMEM;
rc->ies = new_ies;
}
ptr = rc->ies->IEData;
size = length;
for (;;) {
prev_ie = ptr;
prev_size = size;
ie = uwb_ie_next(&ptr, &size);
if (!ie || ie->element_id > new_ie->element_id)
break;
}
memmove(prev_ie + new_ie_len, prev_ie, prev_size);
memcpy(prev_ie, new_ie, new_ie_len);
rc->ies->wIELength = cpu_to_le16(length + new_ie_len);
return 0;
}
/**
* uwb_rc_ie_add - add new IEs to the radio controller's beacon
* @uwb_rc: the radio controller.
* @ies: the buffer containing the new IE or IEs to be added to
* the device's beacon.
* @size: length of all the IEs.
*
* According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB
* after the device sent the first beacon that includes the IEs specified
* in the SET IE command. We thus cannot send this command if the device is
* not beaconing. Instead, a SET IE command will be sent later right after
* we start beaconing.
*
* Setting an IE on the device will overwrite all current IEs in device. So
* we take the current IEs being transmitted by the device, insert the
* new one, and call SET IE with all the IEs needed.
*
* Returns 0 on success; or -ENOMEM.
*/
int uwb_rc_ie_add(struct uwb_rc *uwb_rc,
const struct uwb_ie_hdr *ies, size_t size)
{
int result = 0;
void *ptr;
const struct uwb_ie_hdr *ie;
mutex_lock(&uwb_rc->ies_mutex);
ptr = (void *)ies;
for (;;) {
ie = uwb_ie_next(&ptr, &size);
if (!ie)
break;
result = uwb_rc_ie_add_one(uwb_rc, ie);
if (result < 0)
break;
}
if (result >= 0) {
if (size == 0) {
if (uwb_rc->beaconing != -1)
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
} else
result = -EINVAL;
}
mutex_unlock(&uwb_rc->ies_mutex);
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_add);
/*
* Remove an IE from internal cache
*
* We are dealing with our internal IE cache so no need to verify that the
* IEs are valid (it has been done already).
*
* Should be called with ies_mutex held
*
* We do not break out once an IE is found in the cache. It is currently
* possible to have more than one IE with the same ID included in the
* beacon. We don't reallocate, we just mark the size smaller.
*/
static
void uwb_rc_ie_cache_rm(struct uwb_rc *uwb_rc, enum uwb_ie to_remove)
{
struct uwb_ie_hdr *ie;
size_t len = le16_to_cpu(uwb_rc->ies->wIELength);
void *ptr;
size_t size;
ptr = uwb_rc->ies->IEData;
size = len;
for (;;) {
ie = uwb_ie_next(&ptr, &size);
if (!ie)
break;
if (ie->element_id == to_remove) {
len -= sizeof(struct uwb_ie_hdr) + ie->length;
memmove(ie, ptr, size);
ptr = ie;
}
}
uwb_rc->ies->wIELength = cpu_to_le16(len);
}
/**
* uwb_rc_ie_rm - remove an IE from the radio controller's beacon
* @uwb_rc: the radio controller.
* @element_id: the element ID of the IE to remove.
*
* Only IEs previously added with uwb_rc_ie_add() may be removed.
*
* Returns 0 on success; or -ve the SET-IE command to the radio
* controller failed.
*/
int uwb_rc_ie_rm(struct uwb_rc *uwb_rc, enum uwb_ie element_id)
{
int result = 0;
mutex_lock(&uwb_rc->ies_mutex);
uwb_rc_ie_cache_rm(uwb_rc, element_id);
if (uwb_rc->beaconing != -1)
result = uwb_rc_set_ie(uwb_rc, uwb_rc->ies);
mutex_unlock(&uwb_rc->ies_mutex);
return result;
}
EXPORT_SYMBOL_GPL(uwb_rc_ie_rm);