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Commit 3f52b7e3 authored by Marco Porsch's avatar Marco Porsch Committed by Johannes Berg
Browse files

mac80211: mesh power save basics 



Add routines to
- maintain a PS mode for each peer and a non-peer PS mode
- indicate own PS mode in transmitted frames
- track neighbor STAs power modes
- buffer frames when neighbors are in PS mode
- add TIM and Awake Window IE to beacons
- release frames in Mesh Peer Service Periods

Add local_pm to sta_info to represent the link-specific power
mode at this station towards the remote station. When a peer
link is established, use the default power mode stored in mesh
config. Update the PS status if the peering status of a neighbor
changes.
Maintain a mesh power mode for non-peer mesh STAs. Set the
non-peer power mode to active mode during peering. Authenticated
mesh peering is currently not working when either node is
configured to be in power save mode.

Indicate the current power mode in transmitted frames. Use QoS
Nulls to indicate mesh power mode transitions.
For performance reasons, calls to the function setting the frame
flags are placed in HWMP routing routines, as there the STA
pointer is already available.

Add peer_pm to sta_info to represent the peer's link-specific
power mode towards the local station. Add nonpeer_pm to
represent the peer's power mode towards all non-peer stations.
Track power modes based on received frames.

Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS
neighbor counter and group-addressed frame buffer).

Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame
buffering routines in the tx path. Update num_sta_ps to buffer
and release group-addressed frames after DTIM beacons.

Announce the awake window duration in beacons if in light or
deep sleep mode towards any peer or non-peer. Create a TIM IE
similarly to AP mode and add it to mesh beacons. Parse received
Awake Window IEs and check TIM IEs for buffered frames.

Release frames towards peers in mesh Peer Service Periods. Use
the corresponding trigger frames and monitor the MPSP status.
Append a QoS Null as trigger frame if neccessary to properly end
the MPSP. Currently, in HT channels MPSPs behave imperfectly and
show large delay spikes and frame losses.

Signed-off-by: default avatarMarco Porsch <marco@cozybit.com>
Signed-off-by: default avatarIvan Bezyazychnyy <ivan.bezyazychnyy@gmail.com>
Signed-off-by: default avatarMike Krinkin <krinkin.m.u@gmail.com>
Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 0532d4f1

include/linux/ieee80211.h

+8 −0
Original line number Diff line number Diff line
@@ -151,6 +151,11 @@ 
/* Mesh Control 802.11s */

#define IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT  0x0100



/* Mesh Power Save Level */

#define IEEE80211_QOS_CTL_MESH_PS_LEVEL		0x0200

/* Mesh Receiver Service Period Initiated */

#define IEEE80211_QOS_CTL_RSPI			0x0400



/* U-APSD queue for WMM IEs sent by AP */

#define IEEE80211_WMM_IE_AP_QOSINFO_UAPSD	(1<<7)

#define IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK	0x0f
@@ -675,11 +680,14 @@ struct ieee80211_meshconf_ie { 
 * @IEEE80211_MESHCONF_CAPAB_FORWARDING: the STA forwards MSDUs

 * @IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING: TBTT adjustment procedure

 *	is ongoing

 * @IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL: STA is in deep sleep mode or has

 *	neighbors in deep sleep mode

 */

enum mesh_config_capab_flags {

	IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS		= 0x01,

	IEEE80211_MESHCONF_CAPAB_FORWARDING		= 0x08,

	IEEE80211_MESHCONF_CAPAB_TBTT_ADJUSTING		= 0x20,

	IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL	= 0x40,

};



/**

net/mac80211/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -258,6 +258,17 @@ config MAC80211_MESH_SYNC_DEBUG 


	  Do not select this option.



config MAC80211_MESH_PS_DEBUG

	bool "Verbose mesh powersave debugging"

	depends on MAC80211_DEBUG_MENU

	depends on MAC80211_MESH

	---help---

	  Selecting this option causes mac80211 to print out very verbose mesh

	  powersave debugging messages (when mac80211 is taking part in a

	  mesh network).



	  Do not select this option.



config MAC80211_TDLS_DEBUG

	bool "Verbose TDLS debugging"

	depends on MAC80211_DEBUG_MENU

net/mac80211/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -39,7 +39,8 @@ mac80211-$(CONFIG_MAC80211_MESH) += \ 
	mesh_pathtbl.o \

	mesh_plink.o \

	mesh_hwmp.o \

	mesh_sync.o

	mesh_sync.o \

	mesh_ps.o



mac80211-$(CONFIG_PM) += pm.o

net/mac80211/cfg.c

+26 −1
Original line number Diff line number Diff line
@@ -492,7 +492,10 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) 
#ifdef CONFIG_MAC80211_MESH

		sinfo->filled |= STATION_INFO_LLID |

				 STATION_INFO_PLID |

				 STATION_INFO_PLINK_STATE;

				 STATION_INFO_PLINK_STATE |

				 STATION_INFO_LOCAL_PM |

				 STATION_INFO_PEER_PM |

				 STATION_INFO_NONPEER_PM;



		sinfo->llid = le16_to_cpu(sta->llid);

		sinfo->plid = le16_to_cpu(sta->plid);
@@ -501,6 +504,9 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) 
			sinfo->filled |= STATION_INFO_T_OFFSET;

			sinfo->t_offset = sta->t_offset;

		}

		sinfo->local_pm = sta->local_pm;

		sinfo->peer_pm = sta->peer_pm;

		sinfo->nonpeer_pm = sta->nonpeer_pm;

#endif

	}
@@ -1262,6 +1268,10 @@ static int sta_apply_parameters(struct ieee80211_local *local, 
					changed = mesh_plink_inc_estab_count(

							sdata);

				sta->plink_state = params->plink_state;



				ieee80211_mps_sta_status_update(sta);

				ieee80211_mps_set_sta_local_pm(sta,

					sdata->u.mesh.mshcfg.power_mode);

				break;

			case NL80211_PLINK_LISTEN:

			case NL80211_PLINK_BLOCKED:
@@ -1273,6 +1283,9 @@ static int sta_apply_parameters(struct ieee80211_local *local, 
					changed = mesh_plink_dec_estab_count(

							sdata);

				sta->plink_state = params->plink_state;



				ieee80211_mps_sta_status_update(sta);

				ieee80211_mps_local_status_update(sdata);

				break;

			default:

				/*  nothing  */
@@ -1289,6 +1302,9 @@ static int sta_apply_parameters(struct ieee80211_local *local, 
				break;

			}

		}



		if (params->local_pm)

			ieee80211_mps_set_sta_local_pm(sta, params->local_pm);

#endif

	}
@@ -1777,6 +1793,15 @@ static int ieee80211_update_mesh_config(struct wiphy *wiphy, 
	if (_chg_mesh_attr(NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL, mask))

		conf->dot11MeshHWMPconfirmationInterval =

			nconf->dot11MeshHWMPconfirmationInterval;

	if (_chg_mesh_attr(NL80211_MESHCONF_POWER_MODE, mask)) {

		conf->power_mode = nconf->power_mode;

		ieee80211_mps_local_status_update(sdata);

	}

	if (_chg_mesh_attr(NL80211_MESHCONF_AWAKE_WINDOW, mask)) {

		conf->dot11MeshAwakeWindowDuration =

			nconf->dot11MeshAwakeWindowDuration;

		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);

	}

	return 0;

}

net/mac80211/debug.h

+10 −0
Original line number Diff line number Diff line
@@ -44,6 +44,12 @@ 
#define MAC80211_MESH_SYNC_DEBUG 0

#endif



#ifdef CONFIG_MAC80211_MESH_PS_DEBUG

#define MAC80211_MESH_PS_DEBUG 1

#else

#define MAC80211_MESH_PS_DEBUG 0

#endif



#ifdef CONFIG_MAC80211_TDLS_DEBUG

#define MAC80211_TDLS_DEBUG 1

#else
@@ -151,6 +157,10 @@ do { \ 
	_sdata_dbg(MAC80211_MESH_SYNC_DEBUG,				\

		   sdata, fmt, ##__VA_ARGS__)



#define mps_dbg(sdata, fmt, ...)					\

	_sdata_dbg(MAC80211_MESH_PS_DEBUG,				\

		   sdata, fmt, ##__VA_ARGS__)



#define tdls_dbg(sdata, fmt, ...)					\

	_sdata_dbg(MAC80211_TDLS_DEBUG,					\

		   sdata, fmt, ##__VA_ARGS__)