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alistair23-linux/drivers/uwb/drp.c
Kees Cook e99e88a9d2 treewide: setup_timer() -> timer_setup() 
This converts all remaining cases of the old setup_timer() API into using
timer_setup(), where the callback argument is the structure already
holding the struct timer_list. These should have no behavioral changes,
since they just change which pointer is passed into the callback with
the same available pointers after conversion. It handles the following
examples, in addition to some other variations.

Casting from unsigned long:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, ptr);

and forced object casts:

    void my_callback(struct something *ptr)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);

become:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

Direct function assignments:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    ptr->my_timer.function = my_callback;

have a temporary cast added, along with converting the args:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;

And finally, callbacks without a data assignment:

    void my_callback(unsigned long data)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, 0);

have their argument renamed to verify they're unused during conversion:

    void my_callback(struct timer_list *unused)
    {
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

The conversion is done with the following Coccinelle script:

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/timer_setup.cocci

@fix_address_of@
expression e;
@@

 setup_timer(
-&(e)
+&e
 , ...)

// Update any raw setup_timer() usages that have a NULL callback, but
// would otherwise match change_timer_function_usage, since the latter
// will update all function assignments done in the face of a NULL
// function initialization in setup_timer().
@change_timer_function_usage_NULL@
expression _E;
identifier _timer;
type _cast_data;
@@

(
-setup_timer(&_E->_timer, NULL, _E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E->_timer, NULL, (_cast_data)_E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, &_E);
+timer_setup(&_E._timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, (_cast_data)&_E);
+timer_setup(&_E._timer, NULL, 0);
)

@change_timer_function_usage@
expression _E;
identifier _timer;
struct timer_list _stl;
identifier _callback;
type _cast_func, _cast_data;
@@

(
-setup_timer(&_E->_timer, _callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
 _E->_timer@_stl.function = _callback;
|
 _E->_timer@_stl.function = &_callback;
|
 _E->_timer@_stl.function = (_cast_func)_callback;
|
 _E->_timer@_stl.function = (_cast_func)&_callback;
|
 _E._timer@_stl.function = _callback;
|
 _E._timer@_stl.function = &_callback;
|
 _E._timer@_stl.function = (_cast_func)_callback;
|
 _E._timer@_stl.function = (_cast_func)&_callback;
)

// callback(unsigned long arg)
@change_callback_handle_cast
 depends on change_timer_function_usage@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
identifier _handle;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
(
	... when != _origarg
	_handletype *_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
)
 }

// callback(unsigned long arg) without existing variable
@change_callback_handle_cast_no_arg
 depends on change_timer_function_usage &&
                     !change_callback_handle_cast@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
+	_handletype *_origarg = from_timer(_origarg, t, _timer);
+
	... when != _origarg
-	(_handletype *)_origarg
+	_origarg
	... when != _origarg
 }

// Avoid already converted callbacks.
@match_callback_converted
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
	    !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier t;
@@

 void _callback(struct timer_list *t)
 { ... }

// callback(struct something *handle)
@change_callback_handle_arg
 depends on change_timer_function_usage &&
	    !match_callback_converted &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
@@

 void _callback(
-_handletype *_handle
+struct timer_list *t
 )
 {
+	_handletype *_handle = from_timer(_handle, t, _timer);
	...
 }

// If change_callback_handle_arg ran on an empty function, remove
// the added handler.
@unchange_callback_handle_arg
 depends on change_timer_function_usage &&
	    change_callback_handle_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
identifier t;
@@

 void _callback(struct timer_list *t)
 {
-	_handletype *_handle = from_timer(_handle, t, _timer);
 }

// We only want to refactor the setup_timer() data argument if we've found
// the matching callback. This undoes changes in change_timer_function_usage.
@unchange_timer_function_usage
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg &&
	    !change_callback_handle_arg@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type change_timer_function_usage._cast_data;
@@

(
-timer_setup(&_E->_timer, _callback, 0);
+setup_timer(&_E->_timer, _callback, (_cast_data)_E);
|
-timer_setup(&_E._timer, _callback, 0);
+setup_timer(&_E._timer, _callback, (_cast_data)&_E);
)

// If we fixed a callback from a .function assignment, fix the
// assignment cast now.
@change_timer_function_assignment
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_func;
typedef TIMER_FUNC_TYPE;
@@

(
 _E->_timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-&_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
)

// Sometimes timer functions are called directly. Replace matched args.
@change_timer_function_calls
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression _E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_data;
@@

 _callback(
(
-(_cast_data)_E
+&_E->_timer
|
-(_cast_data)&_E
+&_E._timer
|
-_E
+&_E->_timer
)
 )

// If a timer has been configured without a data argument, it can be
// converted without regard to the callback argument, since it is unused.
@match_timer_function_unused_data@
expression _E;
identifier _timer;
identifier _callback;
@@

(
-setup_timer(&_E->_timer, _callback, 0);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0L);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0UL);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0L);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0UL);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0L);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0UL);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0L);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0UL);
+timer_setup(_timer, _callback, 0);
)

@change_callback_unused_data
 depends on match_timer_function_unused_data@
identifier match_timer_function_unused_data._callback;
type _origtype;
identifier _origarg;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *unused
 )
 {
	... when != _origarg
 }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:07 -08:00

854 lines
24 KiB
C
Raw Blame History

/*
* Ultra Wide Band
* Dynamic Reservation Protocol handling
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
* Copyright (C) 2008 Cambridge Silicon Radio Ltd.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include "uwb-internal.h"
/* DRP Conflict Actions ([ECMA-368 2nd Edition] 17.4.6) */
enum uwb_drp_conflict_action {
/* Reservation is maintained, no action needed */
UWB_DRP_CONFLICT_MANTAIN = 0,
/* the device shall not transmit frames in conflicting MASs in
* the following superframe. If the device is the reservation
* target, it shall also set the Reason Code in its DRP IE to
* Conflict in its beacon in the following superframe.
*/
UWB_DRP_CONFLICT_ACT1,
/* the device shall not set the Reservation Status bit to ONE
* and shall not transmit frames in conflicting MASs. If the
* device is the reservation target, it shall also set the
* Reason Code in its DRP IE to Conflict.
*/
UWB_DRP_CONFLICT_ACT2,
/* the device shall not transmit frames in conflicting MASs in
* the following superframe. It shall remove the conflicting
* MASs from the reservation or set the Reservation Status to
* ZERO in its beacon in the following superframe. If the
* device is the reservation target, it shall also set the
* Reason Code in its DRP IE to Conflict.
*/
UWB_DRP_CONFLICT_ACT3,
};
static void uwb_rc_set_drp_cmd_done(struct uwb_rc *rc, void *arg,
struct uwb_rceb *reply, ssize_t reply_size)
{
struct uwb_rc_evt_set_drp_ie *r = (struct uwb_rc_evt_set_drp_ie *)reply;
unsigned long flags;
if (r != NULL) {
if (r->bResultCode != UWB_RC_RES_SUCCESS)
dev_err(&rc->uwb_dev.dev, "SET-DRP-IE failed: %s (%d)\n",
uwb_rc_strerror(r->bResultCode), r->bResultCode);
} else
dev_err(&rc->uwb_dev.dev, "SET-DRP-IE: timeout\n");
spin_lock_irqsave(&rc->rsvs_lock, flags);
if (rc->set_drp_ie_pending > 1) {
rc->set_drp_ie_pending = 0;
uwb_rsv_queue_update(rc);
} else {
rc->set_drp_ie_pending = 0;
}
spin_unlock_irqrestore(&rc->rsvs_lock, flags);
}
/**
* Construct and send the SET DRP IE
*
* @rc: UWB Host controller
* @returns: >= 0 number of bytes still available in the beacon
* < 0 errno code on error.
*
* See WUSB[8.6.2.7]: The host must set all the DRP IEs that it wants the
* device to include in its beacon at the same time. We thus have to
* traverse all reservations and include the DRP IEs of all PENDING
* and NEGOTIATED reservations in a SET DRP command for transmission.
*
* A DRP Availability IE is appended.
*
* rc->rsvs_mutex is held
*
* FIXME We currently ignore the returned value indicating the remaining space
* in beacon. This could be used to deny reservation requests earlier if
* determined that they would cause the beacon space to be exceeded.
*/
int uwb_rc_send_all_drp_ie(struct uwb_rc *rc)
{
int result;
struct uwb_rc_cmd_set_drp_ie *cmd;
struct uwb_rsv *rsv;
struct uwb_rsv_move *mv;
int num_bytes = 0;
u8 *IEDataptr;
result = -ENOMEM;
/* First traverse all reservations to determine memory needed. */
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->drp_ie != NULL) {
num_bytes += rsv->drp_ie->hdr.length + 2;
if (uwb_rsv_has_two_drp_ies(rsv) &&
(rsv->mv.companion_drp_ie != NULL)) {
mv = &rsv->mv;
num_bytes +=
mv->companion_drp_ie->hdr.length + 2;
}
}
}
num_bytes += sizeof(rc->drp_avail.ie);
cmd = kzalloc(sizeof(*cmd) + num_bytes, GFP_KERNEL);
if (cmd == NULL)
goto error;
cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SET_DRP_IE);
cmd->wIELength = num_bytes;
IEDataptr = (u8 *)&cmd->IEData[0];
/* FIXME: DRV avail IE is not always needed */
/* put DRP avail IE first */
memcpy(IEDataptr, &rc->drp_avail.ie, sizeof(rc->drp_avail.ie));
IEDataptr += sizeof(struct uwb_ie_drp_avail);
/* Next traverse all reservations to place IEs in allocated memory. */
list_for_each_entry(rsv, &rc->reservations, rc_node) {
if (rsv->drp_ie != NULL) {
memcpy(IEDataptr, rsv->drp_ie,
rsv->drp_ie->hdr.length + 2);
IEDataptr += rsv->drp_ie->hdr.length + 2;
if (uwb_rsv_has_two_drp_ies(rsv) &&
(rsv->mv.companion_drp_ie != NULL)) {
mv = &rsv->mv;
memcpy(IEDataptr, mv->companion_drp_ie,
mv->companion_drp_ie->hdr.length + 2);
IEDataptr +=
mv->companion_drp_ie->hdr.length + 2;
}
}
}
result = uwb_rc_cmd_async(rc, "SET-DRP-IE",
&cmd->rccb, sizeof(*cmd) + num_bytes,
UWB_RC_CET_GENERAL, UWB_RC_CMD_SET_DRP_IE,
uwb_rc_set_drp_cmd_done, NULL);
rc->set_drp_ie_pending = 1;
kfree(cmd);
error:
return result;
}
/*
* Evaluate the action to perform using conflict resolution rules
*
* Return a uwb_drp_conflict_action.
*/
static int evaluate_conflict_action(struct uwb_ie_drp *ext_drp_ie, int ext_beacon_slot,
struct uwb_rsv *rsv, int our_status)
{
int our_tie_breaker = rsv->tiebreaker;
int our_type = rsv->type;
int our_beacon_slot = rsv->rc->uwb_dev.beacon_slot;
int ext_tie_breaker = uwb_ie_drp_tiebreaker(ext_drp_ie);
int ext_status = uwb_ie_drp_status(ext_drp_ie);
int ext_type = uwb_ie_drp_type(ext_drp_ie);
/* [ECMA-368 2nd Edition] 17.4.6 */
if (ext_type == UWB_DRP_TYPE_PCA && our_type == UWB_DRP_TYPE_PCA) {
return UWB_DRP_CONFLICT_MANTAIN;
}
/* [ECMA-368 2nd Edition] 17.4.6-1 */
if (our_type == UWB_DRP_TYPE_ALIEN_BP) {
return UWB_DRP_CONFLICT_MANTAIN;
}
/* [ECMA-368 2nd Edition] 17.4.6-2 */
if (ext_type == UWB_DRP_TYPE_ALIEN_BP) {
/* here we know our_type != UWB_DRP_TYPE_ALIEN_BP */
return UWB_DRP_CONFLICT_ACT1;
}
/* [ECMA-368 2nd Edition] 17.4.6-3 */
if (our_status == 0 && ext_status == 1) {
return UWB_DRP_CONFLICT_ACT2;
}
/* [ECMA-368 2nd Edition] 17.4.6-4 */
if (our_status == 1 && ext_status == 0) {
return UWB_DRP_CONFLICT_MANTAIN;
}
/* [ECMA-368 2nd Edition] 17.4.6-5a */
if (our_tie_breaker == ext_tie_breaker &&
our_beacon_slot < ext_beacon_slot) {
return UWB_DRP_CONFLICT_MANTAIN;
}
/* [ECMA-368 2nd Edition] 17.4.6-5b */
if (our_tie_breaker != ext_tie_breaker &&
our_beacon_slot > ext_beacon_slot) {
return UWB_DRP_CONFLICT_MANTAIN;
}
if (our_status == 0) {
if (our_tie_breaker == ext_tie_breaker) {
/* [ECMA-368 2nd Edition] 17.4.6-6a */
if (our_beacon_slot > ext_beacon_slot) {
return UWB_DRP_CONFLICT_ACT2;
}
} else {
/* [ECMA-368 2nd Edition] 17.4.6-6b */
if (our_beacon_slot < ext_beacon_slot) {
return UWB_DRP_CONFLICT_ACT2;
}
}
} else {
if (our_tie_breaker == ext_tie_breaker) {
/* [ECMA-368 2nd Edition] 17.4.6-7a */
if (our_beacon_slot > ext_beacon_slot) {
return UWB_DRP_CONFLICT_ACT3;
}
} else {
/* [ECMA-368 2nd Edition] 17.4.6-7b */
if (our_beacon_slot < ext_beacon_slot) {
return UWB_DRP_CONFLICT_ACT3;
}
}
}
return UWB_DRP_CONFLICT_MANTAIN;
}
static void handle_conflict_normal(struct uwb_ie_drp *drp_ie,
int ext_beacon_slot,
struct uwb_rsv *rsv,
struct uwb_mas_bm *conflicting_mas)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_rsv_move *mv = &rsv->mv;
struct uwb_drp_backoff_win *bow = &rc->bow;
int action;
action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, uwb_rsv_status(rsv));
if (uwb_rsv_is_owner(rsv)) {
switch(action) {
case UWB_DRP_CONFLICT_ACT2:
/* try move */
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_TO_BE_MOVED);
if (bow->can_reserve_extra_mases == false)
uwb_rsv_backoff_win_increment(rc);
break;
case UWB_DRP_CONFLICT_ACT3:
uwb_rsv_backoff_win_increment(rc);
/* drop some mases with reason modified */
/* put in the companion the mases to be dropped */
bitmap_and(mv->companion_mas.bm, rsv->mas.bm, conflicting_mas->bm, UWB_NUM_MAS);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
default:
break;
}
} else {
switch(action) {
case UWB_DRP_CONFLICT_ACT2:
case UWB_DRP_CONFLICT_ACT3:
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
default:
break;
}
}
}
static void handle_conflict_expanding(struct uwb_ie_drp *drp_ie, int ext_beacon_slot,
struct uwb_rsv *rsv, bool companion_only,
struct uwb_mas_bm *conflicting_mas)
{
struct uwb_rc *rc = rsv->rc;
struct uwb_drp_backoff_win *bow = &rc->bow;
struct uwb_rsv_move *mv = &rsv->mv;
int action;
if (companion_only) {
/* status of companion is 0 at this point */
action = evaluate_conflict_action(drp_ie, ext_beacon_slot, rsv, 0);
if (uwb_rsv_is_owner(rsv)) {
switch(action) {
case UWB_DRP_CONFLICT_ACT2:
case UWB_DRP_CONFLICT_ACT3:
uwb_rsv_set_state(rsv,
UWB_RSV_STATE_O_ESTABLISHED);
rsv->needs_release_companion_mas = false;
if (bow->can_reserve_extra_mases == false)
uwb_rsv_backoff_win_increment(rc);
uwb_drp_avail_release(rsv->rc,
&rsv->mv.companion_mas);
}
} else { /* rsv is target */
switch(action) {
case UWB_DRP_CONFLICT_ACT2:
case UWB_DRP_CONFLICT_ACT3:
uwb_rsv_set_state(rsv,
UWB_RSV_STATE_T_EXPANDING_CONFLICT);
/* send_drp_avail_ie = true; */
}
}
} else { /* also base part of the reservation is conflicting */
if (uwb_rsv_is_owner(rsv)) {
uwb_rsv_backoff_win_increment(rc);
/* remove companion part */
uwb_drp_avail_release(rsv->rc, &rsv->mv.companion_mas);
/* drop some mases with reason modified */
/* put in the companion the mases to be dropped */
bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm,
conflicting_mas->bm, UWB_NUM_MAS);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
} else { /* it is a target rsv */
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
/* send_drp_avail_ie = true; */
}
}
}
static void uwb_drp_handle_conflict_rsv(struct uwb_rc *rc, struct uwb_rsv *rsv,
struct uwb_rc_evt_drp *drp_evt,
struct uwb_ie_drp *drp_ie,
struct uwb_mas_bm *conflicting_mas)
{
struct uwb_rsv_move *mv;
/* check if the conflicting reservation has two drp_ies */
if (uwb_rsv_has_two_drp_ies(rsv)) {
mv = &rsv->mv;
if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm,
UWB_NUM_MAS)) {
handle_conflict_expanding(drp_ie,
drp_evt->beacon_slot_number,
rsv, false, conflicting_mas);
} else {
if (bitmap_intersects(mv->companion_mas.bm,
conflicting_mas->bm, UWB_NUM_MAS)) {
handle_conflict_expanding(
drp_ie, drp_evt->beacon_slot_number,
rsv, true, conflicting_mas);
}
}
} else if (bitmap_intersects(rsv->mas.bm, conflicting_mas->bm,
UWB_NUM_MAS)) {
handle_conflict_normal(drp_ie, drp_evt->beacon_slot_number,
rsv, conflicting_mas);
}
}
static void uwb_drp_handle_all_conflict_rsv(struct uwb_rc *rc,
struct uwb_rc_evt_drp *drp_evt,
struct uwb_ie_drp *drp_ie,
struct uwb_mas_bm *conflicting_mas)
{
struct uwb_rsv *rsv;
list_for_each_entry(rsv, &rc->reservations, rc_node) {
uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie,
conflicting_mas);
}
}
static void uwb_drp_process_target_accepted(struct uwb_rc *rc,
struct uwb_rsv *rsv, struct uwb_rc_evt_drp *drp_evt,
struct uwb_ie_drp *drp_ie, struct uwb_mas_bm *mas)
{
struct uwb_rsv_move *mv = &rsv->mv;
int status;
status = uwb_ie_drp_status(drp_ie);
if (rsv->state == UWB_RSV_STATE_T_CONFLICT) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_CONFLICT);
return;
}
if (rsv->state == UWB_RSV_STATE_T_EXPANDING_ACCEPTED) {
/* drp_ie is companion */
if (!bitmap_equal(rsv->mas.bm, mas->bm, UWB_NUM_MAS)) {
/* stroke companion */
uwb_rsv_set_state(rsv,
UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
}
} else {
if (!bitmap_equal(rsv->mas.bm, mas->bm, UWB_NUM_MAS)) {
if (uwb_drp_avail_reserve_pending(rc, mas) == -EBUSY) {
/* FIXME: there is a conflict, find
* the conflicting reservations and
* take a sensible action. Consider
* that in drp_ie there is the
* "neighbour" */
uwb_drp_handle_all_conflict_rsv(rc, drp_evt,
drp_ie, mas);
} else {
/* accept the extra reservation */
bitmap_copy(mv->companion_mas.bm, mas->bm,
UWB_NUM_MAS);
uwb_rsv_set_state(rsv,
UWB_RSV_STATE_T_EXPANDING_ACCEPTED);
}
} else {
if (status) {
uwb_rsv_set_state(rsv,
UWB_RSV_STATE_T_ACCEPTED);
}
}
}
}
/*
* Based on the DRP IE, transition a target reservation to a new
* state.
*/
static void uwb_drp_process_target(struct uwb_rc *rc, struct uwb_rsv *rsv,
struct uwb_ie_drp *drp_ie, struct uwb_rc_evt_drp *drp_evt)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_rsv_move *mv = &rsv->mv;
int status;
enum uwb_drp_reason reason_code;
struct uwb_mas_bm mas;
status = uwb_ie_drp_status(drp_ie);
reason_code = uwb_ie_drp_reason_code(drp_ie);
uwb_drp_ie_to_bm(&mas, drp_ie);
switch (reason_code) {
case UWB_DRP_REASON_ACCEPTED:
uwb_drp_process_target_accepted(rc, rsv, drp_evt, drp_ie, &mas);
break;
case UWB_DRP_REASON_MODIFIED:
/* check to see if we have already modified the reservation */
if (bitmap_equal(rsv->mas.bm, mas.bm, UWB_NUM_MAS)) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_ACCEPTED);
break;
}
/* find if the owner wants to expand or reduce */
if (bitmap_subset(mas.bm, rsv->mas.bm, UWB_NUM_MAS)) {
/* owner is reducing */
bitmap_andnot(mv->companion_mas.bm, rsv->mas.bm, mas.bm,
UWB_NUM_MAS);
uwb_drp_avail_release(rsv->rc, &mv->companion_mas);
}
bitmap_copy(rsv->mas.bm, mas.bm, UWB_NUM_MAS);
uwb_rsv_set_state(rsv, UWB_RSV_STATE_T_RESIZED);
break;
default:
dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
reason_code, status);
}
}
static void uwb_drp_process_owner_accepted(struct uwb_rsv *rsv,
struct uwb_mas_bm *mas)
{
struct uwb_rsv_move *mv = &rsv->mv;
switch (rsv->state) {
case UWB_RSV_STATE_O_PENDING:
case UWB_RSV_STATE_O_INITIATED:
case UWB_RSV_STATE_O_ESTABLISHED:
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
break;
case UWB_RSV_STATE_O_MODIFIED:
if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
else
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MODIFIED);
break;
case UWB_RSV_STATE_O_MOVE_REDUCING: /* shouldn' t be a problem */
if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_ESTABLISHED);
else
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
break;
case UWB_RSV_STATE_O_MOVE_EXPANDING:
if (bitmap_equal(mas->bm, mv->companion_mas.bm, UWB_NUM_MAS)) {
/* Companion reservation accepted */
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
} else {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_EXPANDING);
}
break;
case UWB_RSV_STATE_O_MOVE_COMBINING:
if (bitmap_equal(mas->bm, rsv->mas.bm, UWB_NUM_MAS))
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_REDUCING);
else
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_MOVE_COMBINING);
break;
default:
break;
}
}
/*
* Based on the DRP IE, transition an owner reservation to a new
* state.
*/
static void uwb_drp_process_owner(struct uwb_rc *rc, struct uwb_rsv *rsv,
struct uwb_dev *src, struct uwb_ie_drp *drp_ie,
struct uwb_rc_evt_drp *drp_evt)
{
struct device *dev = &rc->uwb_dev.dev;
int status;
enum uwb_drp_reason reason_code;
struct uwb_mas_bm mas;
status = uwb_ie_drp_status(drp_ie);
reason_code = uwb_ie_drp_reason_code(drp_ie);
uwb_drp_ie_to_bm(&mas, drp_ie);
if (status) {
switch (reason_code) {
case UWB_DRP_REASON_ACCEPTED:
uwb_drp_process_owner_accepted(rsv, &mas);
break;
default:
dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
reason_code, status);
}
} else {
switch (reason_code) {
case UWB_DRP_REASON_PENDING:
uwb_rsv_set_state(rsv, UWB_RSV_STATE_O_PENDING);
break;
case UWB_DRP_REASON_DENIED:
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
break;
case UWB_DRP_REASON_CONFLICT:
/* resolve the conflict */
bitmap_complement(mas.bm, src->last_availability_bm,
UWB_NUM_MAS);
uwb_drp_handle_conflict_rsv(rc, rsv, drp_evt, drp_ie, &mas);
break;
default:
dev_warn(dev, "ignoring invalid DRP IE state (%d/%d)\n",
reason_code, status);
}
}
}
static void uwb_cnflt_alien_stroke_timer(struct uwb_cnflt_alien *cnflt)
{
unsigned timeout_us = UWB_MAX_LOST_BEACONS * UWB_SUPERFRAME_LENGTH_US;
mod_timer(&cnflt->timer, jiffies + usecs_to_jiffies(timeout_us));
}
static void uwb_cnflt_update_work(struct work_struct *work)
{
struct uwb_cnflt_alien *cnflt = container_of(work,
struct uwb_cnflt_alien,
cnflt_update_work);
struct uwb_cnflt_alien *c;
struct uwb_rc *rc = cnflt->rc;
unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
mutex_lock(&rc->rsvs_mutex);
list_del(&cnflt->rc_node);
/* update rc global conflicting alien bitmap */
bitmap_zero(rc->cnflt_alien_bitmap.bm, UWB_NUM_MAS);
list_for_each_entry(c, &rc->cnflt_alien_list, rc_node) {
bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm,
c->mas.bm, UWB_NUM_MAS);
}
queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work,
usecs_to_jiffies(delay_us));
kfree(cnflt);
mutex_unlock(&rc->rsvs_mutex);
}
static void uwb_cnflt_timer(struct timer_list *t)
{
struct uwb_cnflt_alien *cnflt = from_timer(cnflt, t, timer);
queue_work(cnflt->rc->rsv_workq, &cnflt->cnflt_update_work);
}
/*
* We have received an DRP_IE of type Alien BP and we need to make
* sure we do not transmit in conflicting MASs.
*/
static void uwb_drp_handle_alien_drp(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_mas_bm mas;
struct uwb_cnflt_alien *cnflt;
unsigned long delay_us = UWB_MAS_LENGTH_US * UWB_MAS_PER_ZONE;
uwb_drp_ie_to_bm(&mas, drp_ie);
list_for_each_entry(cnflt, &rc->cnflt_alien_list, rc_node) {
if (bitmap_equal(cnflt->mas.bm, mas.bm, UWB_NUM_MAS)) {
/* Existing alien BP reservation conflicting
* bitmap, just reset the timer */
uwb_cnflt_alien_stroke_timer(cnflt);
return;
}
}
/* New alien BP reservation conflicting bitmap */
/* alloc and initialize new uwb_cnflt_alien */
cnflt = kzalloc(sizeof(struct uwb_cnflt_alien), GFP_KERNEL);
if (!cnflt) {
dev_err(dev, "failed to alloc uwb_cnflt_alien struct\n");
return;
}
INIT_LIST_HEAD(&cnflt->rc_node);
timer_setup(&cnflt->timer, uwb_cnflt_timer, 0);
cnflt->rc = rc;
INIT_WORK(&cnflt->cnflt_update_work, uwb_cnflt_update_work);
bitmap_copy(cnflt->mas.bm, mas.bm, UWB_NUM_MAS);
list_add_tail(&cnflt->rc_node, &rc->cnflt_alien_list);
/* update rc global conflicting alien bitmap */
bitmap_or(rc->cnflt_alien_bitmap.bm, rc->cnflt_alien_bitmap.bm, mas.bm, UWB_NUM_MAS);
queue_delayed_work(rc->rsv_workq, &rc->rsv_alien_bp_work, usecs_to_jiffies(delay_us));
/* start the timer */
uwb_cnflt_alien_stroke_timer(cnflt);
}
static void uwb_drp_process_not_involved(struct uwb_rc *rc,
struct uwb_rc_evt_drp *drp_evt,
struct uwb_ie_drp *drp_ie)
{
struct uwb_mas_bm mas;
uwb_drp_ie_to_bm(&mas, drp_ie);
uwb_drp_handle_all_conflict_rsv(rc, drp_evt, drp_ie, &mas);
}
static void uwb_drp_process_involved(struct uwb_rc *rc, struct uwb_dev *src,
struct uwb_rc_evt_drp *drp_evt,
struct uwb_ie_drp *drp_ie)
{
struct uwb_rsv *rsv;
rsv = uwb_rsv_find(rc, src, drp_ie);
if (!rsv) {
/*
* No reservation? It's either for a recently
* terminated reservation; or the DRP IE couldn't be
* processed (e.g., an invalid IE or out of memory).
*/
return;
}
/*
* Do nothing with DRP IEs for reservations that have been
* terminated.
*/
if (rsv->state == UWB_RSV_STATE_NONE) {
uwb_rsv_set_state(rsv, UWB_RSV_STATE_NONE);
return;
}
if (uwb_ie_drp_owner(drp_ie))
uwb_drp_process_target(rc, rsv, drp_ie, drp_evt);
else
uwb_drp_process_owner(rc, rsv, src, drp_ie, drp_evt);
}
static bool uwb_drp_involves_us(struct uwb_rc *rc, struct uwb_ie_drp *drp_ie)
{
return uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, &drp_ie->dev_addr) == 0;
}
/*
* Process a received DRP IE.
*/
static void uwb_drp_process(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
struct uwb_dev *src, struct uwb_ie_drp *drp_ie)
{
if (uwb_ie_drp_type(drp_ie) == UWB_DRP_TYPE_ALIEN_BP)
uwb_drp_handle_alien_drp(rc, drp_ie);
else if (uwb_drp_involves_us(rc, drp_ie))
uwb_drp_process_involved(rc, src, drp_evt, drp_ie);
else
uwb_drp_process_not_involved(rc, drp_evt, drp_ie);
}
/*
* Process a received DRP Availability IE
*/
static void uwb_drp_availability_process(struct uwb_rc *rc, struct uwb_dev *src,
struct uwb_ie_drp_avail *drp_availability_ie)
{
bitmap_copy(src->last_availability_bm,
drp_availability_ie->bmp, UWB_NUM_MAS);
}
/*
* Process all the DRP IEs (both DRP IEs and the DRP Availability IE)
* from a device.
*/
static
void uwb_drp_process_all(struct uwb_rc *rc, struct uwb_rc_evt_drp *drp_evt,
size_t ielen, struct uwb_dev *src_dev)
{
struct device *dev = &rc->uwb_dev.dev;
struct uwb_ie_hdr *ie_hdr;
void *ptr;
ptr = drp_evt->ie_data;
for (;;) {
ie_hdr = uwb_ie_next(&ptr, &ielen);
if (!ie_hdr)
break;
switch (ie_hdr->element_id) {
case UWB_IE_DRP_AVAILABILITY:
uwb_drp_availability_process(rc, src_dev, (struct uwb_ie_drp_avail *)ie_hdr);
break;
case UWB_IE_DRP:
uwb_drp_process(rc, drp_evt, src_dev, (struct uwb_ie_drp *)ie_hdr);
break;
default:
dev_warn(dev, "unexpected IE in DRP notification\n");
break;
}
}
if (ielen > 0)
dev_warn(dev, "%d octets remaining in DRP notification\n",
(int)ielen);
}
/**
* uwbd_evt_handle_rc_drp - handle a DRP_IE event
* @evt: the DRP_IE event from the radio controller
*
* This processes DRP notifications from the radio controller, either
* initiating a new reservation or transitioning an existing
* reservation into a different state.
*
* DRP notifications can occur for three different reasons:
*
* - UWB_DRP_NOTIF_DRP_IE_RECVD: one or more DRP IEs with the RC as
* the target or source have been received.
*
* These DRP IEs could be new or for an existing reservation.
*
* If the DRP IE for an existing reservation ceases to be to
* received for at least mMaxLostBeacons, the reservation should be
* considered to be terminated. Note that the TERMINATE reason (see
* below) may not always be signalled (e.g., the remote device has
* two or more reservations established with the RC).
*
* - UWB_DRP_NOTIF_CONFLICT: DRP IEs from any device in the beacon
* group conflict with the RC's reservations.
*
* - UWB_DRP_NOTIF_TERMINATE: DRP IEs are no longer being received
* from a device (i.e., it's terminated all reservations).
*
* Only the software state of the reservations is changed; the setting
* of the radio controller's DRP IEs is done after all the events in
* an event buffer are processed. This saves waiting multiple times
* for the SET_DRP_IE command to complete.
*/
int uwbd_evt_handle_rc_drp(struct uwb_event *evt)
{
struct device *dev = &evt->rc->uwb_dev.dev;
struct uwb_rc *rc = evt->rc;
struct uwb_rc_evt_drp *drp_evt;
size_t ielength, bytes_left;
struct uwb_dev_addr src_addr;
struct uwb_dev *src_dev;
/* Is there enough data to decode the event (and any IEs in
its payload)? */
if (evt->notif.size < sizeof(*drp_evt)) {
dev_err(dev, "DRP event: Not enough data to decode event "
"[%zu bytes left, %zu needed]\n",
evt->notif.size, sizeof(*drp_evt));
return 0;
}
bytes_left = evt->notif.size - sizeof(*drp_evt);
drp_evt = container_of(evt->notif.rceb, struct uwb_rc_evt_drp, rceb);
ielength = le16_to_cpu(drp_evt->ie_length);
if (bytes_left != ielength) {
dev_err(dev, "DRP event: Not enough data in payload [%zu"
"bytes left, %zu declared in the event]\n",
bytes_left, ielength);
return 0;
}
memcpy(src_addr.data, &drp_evt->src_addr, sizeof(src_addr));
src_dev = uwb_dev_get_by_devaddr(rc, &src_addr);
if (!src_dev) {
/*
* A DRP notification from an unrecognized device.
*
* This is probably from a WUSB device that doesn't
* have an EUI-48 and therefore doesn't show up in the
* UWB device database. It's safe to simply ignore
* these.
*/
return 0;
}
mutex_lock(&rc->rsvs_mutex);
/* We do not distinguish from the reason */
uwb_drp_process_all(rc, drp_evt, ielength, src_dev);
mutex_unlock(&rc->rsvs_mutex);
uwb_dev_put(src_dev);
return 0;
}
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