mac80211: process and save VHT MU-MIMO group frame

The Group ID Management frame is an Action frame of
category VHT. It is transmitted by the AP to assign
or change the user position of a STA for one or more
group IDs.
Process and save the group membership data. Notify
underlying driver of changes.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 452c0b0..d9ddb89 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -843,6 +843,8 @@ enum ieee80211_vht_opmode_bits {
 };
 
 #define WLAN_SA_QUERY_TR_ID_LEN 2
+#define WLAN_MEMBERSHIP_LEN 8
+#define WLAN_USER_POSITION_LEN 16
 
 /**
  * struct ieee80211_tpc_report_ie
@@ -991,6 +993,11 @@ struct ieee80211_mgmt {
                                } __packed vht_opmode_notif;
                                struct {
                                        u8 action_code;
+                                       u8 membership[WLAN_MEMBERSHIP_LEN];
+                                       u8 position[WLAN_USER_POSITION_LEN];
+                               } __packed vht_group_notif;
+                               struct {
+                                       u8 action_code;
                                        u8 dialog_token;
                                        u8 tpc_elem_id;
                                        u8 tpc_elem_length;

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7c30faf..8da483b 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -298,6 +298,7 @@ struct ieee80211_vif_chanctx_switch {
  *     note that this is only called when it changes after the channel
  *     context had been assigned.
  * @BSS_CHANGED_OCB: OCB join status changed
+ * @BSS_CHANGED_MU_GROUPS: VHT MU-MIMO group id or user position changed
  */
 enum ieee80211_bss_change {
        BSS_CHANGED_ASSOC               = 1<<0,
@@ -323,6 +324,7 @@ enum ieee80211_bss_change {
        BSS_CHANGED_BEACON_INFO         = 1<<20,
        BSS_CHANGED_BANDWIDTH           = 1<<21,
        BSS_CHANGED_OCB                 = 1<<22,
+       BSS_CHANGED_MU_GROUPS           = 1<<23,
 
        /* when adding here, make sure to change ieee80211_reconfig */
 };
@@ -436,6 +438,19 @@ struct ieee80211_event {
 };
 
 /**
+ * struct ieee80211_mu_group_data - STA's VHT MU-MIMO group data
+ *
+ * This structure describes the group id data of VHT MU-MIMO
+ *
+ * @membership: 64 bits array - a bit is set if station is member of the group
+ * @position: 2 bits per group id indicating the position in the group
+ */
+struct ieee80211_mu_group_data {
+       u8 membership[WLAN_MEMBERSHIP_LEN];
+       u8 position[WLAN_USER_POSITION_LEN];
+};
+
+/**
  * struct ieee80211_bss_conf - holds the BSS's changing parameters
  *
  * This structure keeps information about a BSS (and an association
@@ -477,6 +492,7 @@ struct ieee80211_event {
  * @enable_beacon: whether beaconing should be enabled or not
  * @chandef: Channel definition for this BSS -- the hardware might be
  *     configured a higher bandwidth than this BSS uses, for example.
+ * @mu_group: VHT MU-MIMO group membership data
  * @ht_operation_mode: HT operation mode like in &struct ieee80211_ht_operation.
  *     This field is only valid when the channel is a wide HT/VHT channel.
  *     Note that with TDLS this can be the case (channel is HT, protection must
@@ -535,6 +551,7 @@ struct ieee80211_bss_conf {
        s32 cqm_rssi_thold;
        u32 cqm_rssi_hyst;
        struct cfg80211_chan_def chandef;
+       struct ieee80211_mu_group_data mu_group;
        __be32 arp_addr_list[IEEE80211_BSS_ARP_ADDR_LIST_LEN];
        int arp_addr_cnt;
        bool qos;

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index b84f6aa..747402d 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1714,6 +1714,8 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta);
 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta);
 void ieee80211_sta_set_rx_nss(struct sta_info *sta);
+void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
+                                struct ieee80211_mgmt *mgmt);
 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                   struct sta_info *sta, u8 opmode,
                                  enum ieee80211_band band);

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index c9e325d..33ae3c8 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1271,6 +1271,16 @@ static void ieee80211_iface_work(struct work_struct *work)
                                }
                        }
                        mutex_unlock(&local->sta_mtx);
+               } else if (ieee80211_is_action(mgmt->frame_control) &&
+                          mgmt->u.action.category == WLAN_CATEGORY_VHT) {
+                       switch (mgmt->u.action.u.vht_group_notif.action_code) {
+                       case WLAN_VHT_ACTION_GROUPID_MGMT:
+                               ieee80211_process_mu_groups(sdata, mgmt);
+                               break;
+                       default:
+                               WARN_ON(1);
+                               break;
+                       }
                } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
                        struct ieee80211_hdr *hdr = (void *)mgmt;
                        /*

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 1c342e2..31d5881 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2079,6 +2079,13 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
        memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
        memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
        memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
+
+       /* reset MU-MIMO ownership and group data */
+       memset(sdata->vif.bss_conf.mu_group.membership, 0,
+              sizeof(sdata->vif.bss_conf.mu_group.membership));
+       memset(sdata->vif.bss_conf.mu_group.position, 0,
+              sizeof(sdata->vif.bss_conf.mu_group.position));
+       changed |= BSS_CHANGED_MU_GROUPS;
        sdata->flags &= ~IEEE80211_SDATA_MU_MIMO_OWNER;
 
        sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index bc08185..a5668b5 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2738,6 +2738,11 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
                                                    opmode, status->band);
                        goto handled;
                }
+               case WLAN_VHT_ACTION_GROUPID_MGMT: {
+                       if (len < IEEE80211_MIN_ACTION_SIZE + 25)
+                               goto invalid;
+                       goto queue;
+               }
                default:
                        break;
                }

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 3943d4b..f4b2c04 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1928,6 +1928,9 @@ int ieee80211_reconfig(struct ieee80211_local *local)
                          BSS_CHANGED_IDLE |
                          BSS_CHANGED_TXPOWER;
 
+               if (sdata->flags & IEEE80211_SDATA_MU_MIMO_OWNER)
+                       changed |= BSS_CHANGED_MU_GROUPS;
+
                switch (sdata->vif.type) {
                case NL80211_IFTYPE_STATION:
                        changed |= BSS_CHANGED_ASSOC |

diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index c38b2f0..050de08 100644 (file)
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -1,6 +1,9 @@
 /*
  * VHT handling
  *
+ * Portions of this file
+ * Copyright(c) 2015 Intel Deutschland GmbH
+ *
  * 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.
@@ -425,6 +428,28 @@ u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
        return changed;
 }
 
+void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
+                                struct ieee80211_mgmt *mgmt)
+{
+       struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
+
+       if (!(sdata->flags & IEEE80211_SDATA_MU_MIMO_OWNER))
+               return;
+
+       if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
+                   bss_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
+           !memcmp(mgmt->u.action.u.vht_group_notif.membership,
+                   bss_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
+               return;
+
+       memcpy(mgmt->u.action.u.vht_group_notif.membership,
+              bss_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN);
+       memcpy(mgmt->u.action.u.vht_group_notif.position,
+              bss_conf->mu_group.position, WLAN_USER_POSITION_LEN);
+
+       ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_MU_GROUPS);
+}
+
 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
                                 struct sta_info *sta, u8 opmode,
                                 enum ieee80211_band band)