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, 18 insertions, 17 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index 62114616317c..974eeecc9153 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -135,7 +135,7 @@ static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 			  struct rs_rate *rate,
 			  const struct rs_tx_column *next_col)
 {
-	if (!sta->ht_cap.ht_supported)
+	if (!sta->deflink.ht_cap.ht_supported)
 		return false;
 
 	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
@@ -157,7 +157,7 @@ static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 			  struct rs_rate *rate,
 			  const struct rs_tx_column *next_col)
 {
-	if (!sta->ht_cap.ht_supported)
+	if (!sta->deflink.ht_cap.ht_supported)
 		return false;
 
 	return true;
@@ -167,8 +167,8 @@ static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 			 struct rs_rate *rate,
 			 const struct rs_tx_column *next_col)
 {
-	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
-	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
+	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
+	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
 
 	if (is_ht20(rate) && (ht_cap->cap &
 			     IEEE80211_HT_CAP_SGI_20))
@@ -1369,13 +1369,13 @@ static s32 rs_get_best_rate(struct iwl_mvm *mvm,
 
 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
 {
-	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->vht_cap;
+	struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
 	struct ieee80211_vht_cap vht_cap = {
 		.vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
 		.supp_mcs = sta_vht_cap->vht_mcs,
 	};
 
-	switch (sta->bandwidth) {
+	switch (sta->deflink.bandwidth) {
 	case IEEE80211_STA_RX_BW_160:
 		/*
 		 * Don't use 160 MHz if VHT extended NSS support
@@ -1388,7 +1388,7 @@ static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
 		if (ieee80211_get_vht_max_nss(&vht_cap,
 					      IEEE80211_VHT_CHANWIDTH_160MHZ,
 					      0, true,
-					      sta->rx_nss) < sta->rx_nss)
+					      sta->deflink.rx_nss) < sta->deflink.rx_nss)
 			return RATE_MCS_CHAN_WIDTH_80;
 		return RATE_MCS_CHAN_WIDTH_160;
 	case IEEE80211_STA_RX_BW_80:
@@ -2537,7 +2537,7 @@ static void rs_get_initial_rate(struct iwl_mvm *mvm,
 	 * In case of VHT/HT when the rssi is low fallback to the case of
 	 * legacy rates.
 	 */
-	if (sta->vht_cap.vht_supported &&
+	if (sta->deflink.vht_cap.vht_supported &&
 	    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
 		/*
 		 * In AP mode, when a new station associates, rs is initialized
@@ -2563,14 +2563,15 @@ static void rs_get_initial_rate(struct iwl_mvm *mvm,
 			nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
 			break;
 		default:
-			IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
+			IWL_ERR(mvm, "Invalid BW %d\n",
+				sta->deflink.bandwidth);
 			goto out;
 		}
 
 		active_rate = lq_sta->active_siso_rate;
 		rate->type = LQ_VHT_SISO;
 		rate->bw = bw;
-	} else if (sta->ht_cap.ht_supported &&
+	} else if (sta->deflink.ht_cap.ht_supported &&
 		   best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
 		initial_rates = rs_optimal_rates_ht;
 		nentries = ARRAY_SIZE(rs_optimal_rates_ht);
@@ -2761,14 +2762,14 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
 
 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
 			if (i == IWL_RATE_MCS_9_INDEX &&
-			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
+			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
 				continue;
 
 			lq_sta->active_siso_rate |= BIT(i);
 		}
 	}
 
-	if (sta->rx_nss < 2)
+	if (sta->deflink.rx_nss < 2)
 		return;
 
 	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
@@ -2779,7 +2780,7 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
 
 			/* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
 			if (i == IWL_RATE_MCS_9_INDEX &&
-			    sta->bandwidth == IEEE80211_STA_RX_BW_20)
+			    sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
 				continue;
 
 			lq_sta->active_mimo2_rate |= BIT(i);
@@ -2916,8 +2917,8 @@ static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 {
 	int i, j;
 	struct ieee80211_hw *hw = mvm->hw;
-	struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
-	struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
+	struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
+	struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
 	struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
 	struct ieee80211_supported_band *sband;
@@ -2953,7 +2954,7 @@ static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 	/*
 	 * active legacy rates as per supported rates bitmap
 	 */
-	supp = sta->supp_rates[sband->band];
+	supp = sta->deflink.supp_rates[sband->band];
 	lq_sta->active_legacy_rate = 0;
 	for_each_set_bit(i, &supp, BITS_PER_LONG)
 		lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
@@ -3246,7 +3247,7 @@ static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
 	IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
 done:
 	/* See if there's a better rate or modulation mode to try. */
-	if (sta->supp_rates[info->band])
+	if (sta->deflink.supp_rates[info->band])
 		rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
 }