mac80211: prepare sta handling for MLO support

Currently in mac80211 each STA object is represented
using sta_info datastructure with the associated
STA specific information and drivers access ieee80211_sta
part of it.

With MLO (Multi Link Operation) support being added
in 802.11be standard, though the association is logically
with a single Multi Link capable STA, at the physical level
communication can happen via different advertised
links (uniquely identified by Channel, operating class,
BSSID) and hence the need to handle multiple link
STA parameters within a composite sta_info object
called the MLD STA. The different link STA part of
MLD STA are identified using the link address which can
be same or different as the MLD STA address and unique
link id based on the link vif.

To support extension of such a model, the sta_info
datastructure is modified to hold multiple link STA
objects with link specific params currently within
sta_info moved to this new structure. Similarly this is
done for ieee80211_sta as well which will be accessed
within mac80211 as well as by drivers, hence trivial
driver changes are expected to support this.

For current non MLO supported drivers, only one link STA
is present and link information is accessed via 'deflink'
member.

For MLO drivers, we still need to define the APIs etc. to
get the correct link ID and access the correct part of
the station info.

Currently in mac80211, all link STA info are accessed directly
via deflink. These will be updated to access via link pointers
indexed by link id with MLO support patches, with link id
being 0 for non MLO supported cases.

Except for couple of macro related changes, below spatch takes
care of updating mac80211 and driver code to access to the
link STA info via deflink.

  @ieee80211_sta@
  struct ieee80211_sta *s;
  struct sta_info *si;
  identifier var = {supp_rates, ht_cap, vht_cap, he_cap, he_6ghz_capa, eht_cap, rx_nss, bandwidth, txpwr};
  @@

  (
    s->
  -    var
  +    deflink.var
  |
   si->sta.
  -    var
  +    deflink.var
  )

  @sta_info@
  struct sta_info *si;
  identifier var = {gtk, pcpu_rx_stats, rx_stats, rx_stats_avg, status_stats, tx_stats, cur_max_bandwidth};
  @@

  (
    si->
  -    var
  +    deflink.var
  )

Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
Link: https://lore.kernel.org/r/1649086883-13246-1-git-send-email-quic_srirrama@quicinc.com
[remove MLO-drivers notes from commit message, not clear yet; run spatch]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 13 insertions, 13 deletions

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 0416c4d22292..14c04fd48b7a 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -637,7 +637,7 @@ ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid,
 
 	/* make sure mandatory rates are always added */
 	sband = local->hw.wiphy->bands[band];
-	sta->sta.supp_rates[band] = supp_rates |
+	sta->sta.deflink.supp_rates[band] = supp_rates |
 			ieee80211_mandatory_rates(sband, scan_width);
 
 	return ieee80211_ibss_finish_sta(sta);
@@ -1005,7 +1005,7 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 		if (sta) {
 			u32 prev_rates;
 
-			prev_rates = sta->sta.supp_rates[band];
+			prev_rates = sta->sta.deflink.supp_rates[band];
 			/* make sure mandatory rates are always added */
 			scan_width = NL80211_BSS_CHAN_WIDTH_20;
 			if (rx_status->bw == RATE_INFO_BW_5)
@@ -1013,13 +1013,13 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 			else if (rx_status->bw == RATE_INFO_BW_10)
 				scan_width = NL80211_BSS_CHAN_WIDTH_10;
 
-			sta->sta.supp_rates[band] = supp_rates |
+			sta->sta.deflink.supp_rates[band] = supp_rates |
 				ieee80211_mandatory_rates(sband, scan_width);
-			if (sta->sta.supp_rates[band] != prev_rates) {
+			if (sta->sta.deflink.supp_rates[band] != prev_rates) {
 				ibss_dbg(sdata,
 					 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n",
 					 sta->sta.addr, prev_rates,
-					 sta->sta.supp_rates[band]);
+					 sta->sta.deflink.supp_rates[band]);
 				rates_updated = true;
 			}
 		} else {
@@ -1043,7 +1043,7 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 		/* we both use HT */
 		struct ieee80211_ht_cap htcap_ie;
 		struct cfg80211_chan_def chandef;
-		enum ieee80211_sta_rx_bandwidth bw = sta->sta.bandwidth;
+		enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth;
 
 		cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT);
 		ieee80211_chandef_ht_oper(elems->ht_operation, &chandef);
@@ -1058,7 +1058,7 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 		    sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) {
 			/* we both use VHT */
 			struct ieee80211_vht_cap cap_ie;
-			struct ieee80211_sta_vht_cap cap = sta->sta.vht_cap;
+			struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap;
 			u32 vht_cap_info =
 				le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 
@@ -1069,11 +1069,11 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 			memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie));
 			ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
 							    &cap_ie, sta);
-			if (memcmp(&cap, &sta->sta.vht_cap, sizeof(cap)))
+			if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap)))
 				rates_updated |= true;
 		}
 
-		if (bw != sta->sta.bandwidth)
+		if (bw != sta->sta.deflink.bandwidth)
 			rates_updated |= true;
 
 		if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef,
@@ -1083,12 +1083,12 @@ static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata,
 
 	if (sta && rates_updated) {
 		u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED;
-		u8 rx_nss = sta->sta.rx_nss;
+		u8 rx_nss = sta->sta.deflink.rx_nss;
 
 		/* Force rx_nss recalculation */
-		sta->sta.rx_nss = 0;
+		sta->sta.deflink.rx_nss = 0;
 		rate_control_rate_init(sta);
-		if (sta->sta.rx_nss != rx_nss)
+		if (sta->sta.deflink.rx_nss != rx_nss)
 			changed |= IEEE80211_RC_NSS_CHANGED;
 
 		drv_sta_rc_update(local, sdata, &sta->sta, changed);
@@ -1235,7 +1235,7 @@ void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
 
 	/* make sure mandatory rates are always added */
 	sband = local->hw.wiphy->bands[band];
-	sta->sta.supp_rates[band] = supp_rates |
+	sta->sta.deflink.supp_rates[band] = supp_rates |
 			ieee80211_mandatory_rates(sband, scan_width);
 
 	spin_lock(&ifibss->incomplete_lock);