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uwb: improved MAS allocator and reservation conflict handling

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Greatly enhance the MAS allocator:
  - Handle row and column reservations.
  - Permit all the available MAS to be allocated.
  - Follows the WiMedia rules on MAS selection.

Take appropriate action when reservation conflicts are detected.
  - Correctly identify which reservation wins the conflict.
  - Protect alien BP reservations.
  - If an owned reservation loses, resize/move it.
  - Follow the backoff procedure before requesting additional MAS.

When reservations are terminated, move the remaining reservations (if
necessary) so they keep following the MAS allocation rules.

Signed-off-by: Stefano Panella <stefano.panella@csr.com>
Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
Stefano Panella
2008-12-12 13:00:06 +00:00
committed by David Vrabel
parent c35fa3ea1a
commit 5b37717a23
12 changed files with 1605 additions and 329 deletions
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47
include/linux/uwb.h
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@ -67,6 +67,7 @@ struct uwb_dev {
struct uwb_dev_addr dev_addr;
int beacon_slot;
DECLARE_BITMAP(streams, UWB_NUM_STREAMS);
DECLARE_BITMAP(last_availability_bm, UWB_NUM_MAS);
};
#define to_uwb_dev(d) container_of(d, struct uwb_dev, dev)
@ -109,6 +110,9 @@ struct uwbd {
*/
struct uwb_mas_bm {
DECLARE_BITMAP(bm, UWB_NUM_MAS);
DECLARE_BITMAP(unsafe_bm, UWB_NUM_MAS);
int safe;
int unsafe;
};
/**
@ -134,14 +138,24 @@ struct uwb_mas_bm {
* FIXME: further target states TBD.
*/
enum uwb_rsv_state {
UWB_RSV_STATE_NONE,
UWB_RSV_STATE_NONE = 0,
UWB_RSV_STATE_O_INITIATED,
UWB_RSV_STATE_O_PENDING,
UWB_RSV_STATE_O_MODIFIED,
UWB_RSV_STATE_O_ESTABLISHED,
UWB_RSV_STATE_O_TO_BE_MOVED,
UWB_RSV_STATE_O_MOVE_EXPANDING,
UWB_RSV_STATE_O_MOVE_COMBINING,
UWB_RSV_STATE_O_MOVE_REDUCING,
UWB_RSV_STATE_T_ACCEPTED,
UWB_RSV_STATE_T_DENIED,
UWB_RSV_STATE_T_CONFLICT,
UWB_RSV_STATE_T_PENDING,
UWB_RSV_STATE_T_EXPANDING_ACCEPTED,
UWB_RSV_STATE_T_EXPANDING_CONFLICT,
UWB_RSV_STATE_T_EXPANDING_PENDING,
UWB_RSV_STATE_T_EXPANDING_DENIED,
UWB_RSV_STATE_T_RESIZED,
UWB_RSV_STATE_LAST,
};
@ -166,6 +180,12 @@ struct uwb_rsv_target {
};
};
struct uwb_rsv_move {
struct uwb_mas_bm final_mas;
struct uwb_ie_drp *companion_drp_ie;
struct uwb_mas_bm companion_mas;
};
/*
* Number of streams reserved for reservations targeted at DevAddrs.
*/
@ -203,6 +223,7 @@ typedef void (*uwb_rsv_cb_f)(struct uwb_rsv *rsv);
*
* @status: negotiation status
* @stream: stream index allocated for this reservation
* @tiebreaker: conflict tiebreaker for this reservation
* @mas: reserved MAS
* @drp_ie: the DRP IE
* @ie_valid: true iff the DRP IE matches the reservation parameters
@ -225,19 +246,22 @@ struct uwb_rsv {
enum uwb_drp_type type;
int max_mas;
int min_mas;
int sparsity;
int max_interval;
bool is_multicast;
uwb_rsv_cb_f callback;
void *pal_priv;
enum uwb_rsv_state state;
bool needs_release_companion_mas;
u8 stream;
u8 tiebreaker;
struct uwb_mas_bm mas;
struct uwb_ie_drp *drp_ie;
struct uwb_rsv_move mv;
bool ie_valid;
struct timer_list timer;
bool expired;
struct work_struct handle_timeout_work;
};
static const
@ -279,6 +303,13 @@ struct uwb_drp_avail {
bool ie_valid;
};
struct uwb_drp_backoff_win {
u8 window;
u8 n;
int total_expired;
struct timer_list timer;
bool can_reserve_extra_mases;
};
const char *uwb_rsv_state_str(enum uwb_rsv_state state);
const char *uwb_rsv_type_str(enum uwb_drp_type type);
@ -294,6 +325,8 @@ void uwb_rsv_terminate(struct uwb_rsv *rsv);
void uwb_rsv_accept(struct uwb_rsv *rsv, uwb_rsv_cb_f cb, void *pal_priv);
void uwb_rsv_get_usable_mas(struct uwb_rsv *orig_rsv, struct uwb_mas_bm *mas);
/**
* Radio Control Interface instance
*
@ -364,12 +397,18 @@ struct uwb_rc {
struct uwbd uwbd;
struct uwb_drp_backoff_win bow;
struct uwb_drp_avail drp_avail;
struct list_head reservations;
struct list_head cnflt_alien_list;
struct uwb_mas_bm cnflt_alien_bitmap;
struct mutex rsvs_mutex;
spinlock_t rsvs_lock;
struct workqueue_struct *rsv_workq;
struct work_struct rsv_update_work;
struct delayed_work rsv_update_work;
struct delayed_work rsv_alien_bp_work;
int set_drp_ie_pending;
struct mutex ies_mutex;
struct uwb_rc_cmd_set_ie *ies;
size_t ies_capacity;