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nl80211: add feature for BSS selection support

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Introducing a new feature that the driver can use to
indicate the driver/firmware supports configuration of BSS
selection criteria upon CONNECT command. This can be useful
when multiple BSS-es are found belonging to the same ESS,
ie. Infra-BSS with same SSID. The criteria can then be used to
offload selection of a preferred BSS.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Lei Zhang <leizh@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
[move wiphy support check into parse_bss_select()]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arend van Spriel 2016-03-02 20:37:18 +01:00 • committed by Johannes Berg
parent f59374eb42
commit 38de03d2a2
4 changed files with 204 additions and 0 deletions
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52
include/uapi/linux/nl80211.h
View file

@ -1797,6 +1797,12 @@ enum nl80211_commands {
* in a PBSS. Specified in %NL80211_CMD_CONNECT to request
* connecting to a PCP, and in %NL80211_CMD_START_AP to start
* a PCP instead of AP. Relevant for DMG networks only.
* @NL80211_ATTR_BSS_SELECT: nested attribute for driver supporting the
* BSS selection feature. When used with %NL80211_CMD_GET_WIPHY it contains
* attributes according &enum nl80211_bss_select_attr to indicate what
* BSS selection behaviours are supported. When used with %NL80211_CMD_CONNECT
* it contains the behaviour-specific attribute containing the parameters for
* BSS selection to be done by driver and/or firmware.
*
* @NUM_NL80211_ATTR: total number of nl80211_attrs available
* @NL80211_ATTR_MAX: highest attribute number currently defined
@ -2174,6 +2180,8 @@ enum nl80211_attrs {
NL80211_ATTR_PBSS,
NL80211_ATTR_BSS_SELECT,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -4667,4 +4675,48 @@ enum nl80211_sched_scan_plan {
__NL80211_SCHED_SCAN_PLAN_AFTER_LAST - 1
};
/**
* struct nl80211_bss_select_rssi_adjust - RSSI adjustment parameters.
*
* @band: band of BSS that must match for RSSI value adjustment.
* @delta: value used to adjust the RSSI value of matching BSS.
*/
struct nl80211_bss_select_rssi_adjust {
__u8 band;
__s8 delta;
} __attribute__((packed));
/**
* enum nl80211_bss_select_attr - attributes for bss selection.
*
* @__NL80211_BSS_SELECT_ATTR_INVALID: reserved.
* @NL80211_BSS_SELECT_ATTR_RSSI: Flag indicating only RSSI-based BSS selection
* is requested.
* @NL80211_BSS_SELECT_ATTR_BAND_PREF: attribute indicating BSS
* selection should be done such that the specified band is preferred.
* When there are multiple BSS-es in the preferred band, the driver
* shall use RSSI-based BSS selection as a second step. The value of
* this attribute is according to &enum nl80211_band (u32).
* @NL80211_BSS_SELECT_ATTR_RSSI_ADJUST: When present the RSSI level for
* BSS-es in the specified band is to be adjusted before doing
* RSSI-based BSS selection. The attribute value is a packed structure
* value as specified by &struct nl80211_bss_select_rssi_adjust.
* @NL80211_BSS_SELECT_ATTR_MAX: highest bss select attribute number.
* @__NL80211_BSS_SELECT_ATTR_AFTER_LAST: internal use.
*
* One and only one of these attributes are found within %NL80211_ATTR_BSS_SELECT
* for %NL80211_CMD_CONNECT. It specifies the required BSS selection behaviour
* which the driver shall use.
*/
enum nl80211_bss_select_attr {
__NL80211_BSS_SELECT_ATTR_INVALID,
NL80211_BSS_SELECT_ATTR_RSSI,
NL80211_BSS_SELECT_ATTR_BAND_PREF,
NL80211_BSS_SELECT_ATTR_RSSI_ADJUST,
/* keep last */
__NL80211_BSS_SELECT_ATTR_AFTER_LAST,
NL80211_BSS_SELECT_ATTR_MAX = __NL80211_BSS_SELECT_ATTR_AFTER_LAST - 1
};
#endif /* __LINUX_NL80211_H */