mac80211: mlme: remove duplicate AID bookkeeping

Maintain the connection AID only in sdata->vif.bss_conf.aid, not
also in sdata->u.mgd.aid.

Keep setting that where we set ifmgd->aid before, which has the
side effect of exposing the AID to the driver before the station
entry (AP) is marked associated, in case it needs it then.
Requested-by: NFelix Fietkau <nbd@nbd.name>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
Tested-by: NLorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/20200417123802.085d4a322b0c.I2e7a2ceceea8c6880219f9e9ee4d4ac985fd295a@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

net/mac80211/debugfs_netdev.c

@@ -236,7 +236,7 @@ IEEE80211_IF_FILE_R(hw_queues);
 
 /* STA attributes */
 IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
-IEEE80211_IF_FILE(aid, u.mgd.aid, DEC);
+IEEE80211_IF_FILE(aid, vif.bss_conf.aid, DEC);
 IEEE80211_IF_FILE(beacon_timeout, u.mgd.beacon_timeout, JIFFIES_TO_MS);
 
 static int ieee80211_set_smps(struct ieee80211_sub_if_data *sdata,

net/mac80211/ieee80211_i.h

@@ -450,8 +450,6 @@ struct ieee80211_if_managed {
 
 	u8 bssid[ETH_ALEN] __aligned(2);
 
-	u16 aid;
-
 	bool powersave; /* powersave requested for this iface */
 	bool broken_ap; /* AP is broken -- turn off powersave */
 	bool have_beacon;

net/mac80211/mlme.c

@@ -3249,7 +3249,7 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 		return false;
 	}
 
-	ifmgd->aid = aid;
+	sdata->vif.bss_conf.aid = aid;
 	ifmgd->tdls_chan_switch_prohibited =
 		elems->ext_capab && elems->ext_capab_len >= 5 &&
 		(elems->ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
@@ -3521,9 +3521,8 @@ static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
 		bss_conf->protected_keep_alive = false;
 	}
 
-	/* set AID and assoc capability,
+	/* set assoc capability (AID was already set earlier),
 	 * ieee80211_set_associated() will tell the driver */
-	bss_conf->aid = aid;
 	bss_conf->assoc_capability = capab_info;
 	ieee80211_set_associated(sdata, cbss, changed);
 
@@ -3948,7 +3947,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 					  mgmt->bssid, bssid);
 
 	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
-	    ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
+	    ieee80211_check_tim(elems.tim, elems.tim_len, bss_conf->aid)) {
 		if (local->hw.conf.dynamic_ps_timeout > 0) {
 			if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 				local->hw.conf.flags &= ~IEEE80211_CONF_PS;

net/mac80211/tdls.c

@@ -226,12 +226,11 @@ static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata,
 static void
 ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 {
-	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 	u8 *pos = skb_put(skb, 4);
 
 	*pos++ = WLAN_EID_AID;
 	*pos++ = 2; /* len */
-	put_unaligned_le16(ifmgd->aid, pos);
+	put_unaligned_le16(sdata->vif.bss_conf.aid, pos);
 }
 
 /* translate numbering in the WMM parameter IE to the mac80211 notation */

net/mac80211/tx.c

@@ -5006,7 +5006,7 @@ struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
 	pspoll = skb_put_zero(skb, sizeof(*pspoll));
 	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
 					    IEEE80211_STYPE_PSPOLL);
-	pspoll->aid = cpu_to_le16(ifmgd->aid);
+	pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid);
 
 	/* aid in PS-Poll has its two MSBs each set to 1 */
 	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);