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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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2
include/linux/uwb/debug-cmd.h
View file

@ -43,7 +43,7 @@ struct uwb_dbg_cmd_rsv_establish {
__u8 type;
__u16 max_mas;
__u16 min_mas;
__u8 sparsity;
__u8 max_interval;
};
struct uwb_dbg_cmd_rsv_terminate {

25
include/linux/uwb/spec.h
View file

@ -58,6 +58,11 @@ enum { UWB_NUM_ZONES = 16 };
*/
#define UWB_MAS_PER_ZONE (UWB_NUM_MAS / UWB_NUM_ZONES)
/*
* Number of MAS required before a row can be considered available.
*/
#define UWB_USABLE_MAS_PER_ROW (UWB_NUM_ZONES - 1)
/*
* Number of streams per DRP reservation between a pair of devices.
*
@ -93,6 +98,26 @@ enum { UWB_BEACON_SLOT_LENGTH_US = 85 };
*/
enum { UWB_MAX_LOST_BEACONS = 3 };
/*
* mDRPBackOffWinMin
*
* The minimum number of superframes to wait before trying to reserve
* extra MAS.
*
* [ECMA-368] section 17.16
*/
enum { UWB_DRP_BACKOFF_WIN_MIN = 2 };
/*
* mDRPBackOffWinMax
*
* The maximum number of superframes to wait before trying to reserve
* extra MAS.
*
* [ECMA-368] section 17.16
*/
enum { UWB_DRP_BACKOFF_WIN_MAX = 16 };
/*
* Length of a superframe in microseconds.
*/