wifi: iwlwifi: mvm: rework active links counting

Remove fw_active_links_num counter since we now have a bitmap of
active links in vif. Also, update link activation status only when
LINK_CONTEXT_MODIFY_ACTIVE bit set in changes parameter.
Signed-off-by: NGregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230329100040.1ecfb27b6b84.I3a5e0bc32b3728e4caae8a231bc3f04ea1d89cad@changeidSigned-off-by: NJohannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/link.c

@@ -104,11 +104,6 @@ int iwl_mvm_link_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 			 link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID))
 		return -EINVAL;
 
-	/* cannot activate third link */
-	if (!link_info->active && active &&
-	    mvmvif->fw_active_links_num >= IWL_MVM_FW_MAX_ACTIVE_LINKS_NUM)
-		return -EINVAL;
-
 	if (changes & LINK_CONTEXT_MODIFY_ACTIVE) {
 		/* When activating a link, phy context should be valid;
 		 * when deactivating a link, it also should be valid since
@@ -119,6 +114,22 @@ int iwl_mvm_link_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 		if (!link_info->phy_ctxt)
 			return 0;
 
+		/* check there aren't too many active links */
+		if (!link_info->active && active) {
+			int i, count = 0;
+
+			/* link with phy_ctxt is active in FW */
+			for_each_mvm_vif_valid_link(mvmvif, i)
+				if (mvmvif->link[i]->phy_ctxt)
+					count++;
+
+			/* FIXME: IWL_MVM_FW_MAX_ACTIVE_LINKS_NUM should be
+			 * defined per HW
+			 */
+			if (count >= IWL_MVM_FW_MAX_ACTIVE_LINKS_NUM)
+				return -EINVAL;
+		}
+
 		/* Catch early if driver tries to activate or deactivate a link
 		 * twice.
 		 */
@@ -230,18 +241,8 @@ int iwl_mvm_link_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 	cmd.flags_mask = cpu_to_le32(flags_mask);
 
 	ret = iwl_mvm_link_cmd_send(mvm, &cmd, FW_CTXT_ACTION_MODIFY);
-	if (!ret) {
-		/* the FW is updated, so now it's possible to update the
-		 * activation status. If activating a link, it was already
-		 * checked above that we didn't reach the FW limit.
-		 */
-		if (link_info->active && !active)
-			mvmvif->fw_active_links_num--;
-		else if (!link_info->active && active)
-			mvmvif->fw_active_links_num++;
-
+	if (!ret && (changes & LINK_CONTEXT_MODIFY_ACTIVE))
 		link_info->active = active;
-	}
 
 	return ret;
 }

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -1027,7 +1027,6 @@ static void iwl_mvm_cleanup_iterator(void *data, u8 *mac,
 
 	memset(&mvmvif->bf_data, 0, sizeof(mvmvif->bf_data));
 
-	mvmvif->fw_active_links_num = 0;
 	for_each_mvm_vif_valid_link(mvmvif, link_id) {
 		mvmvif->link[link_id]->ap_sta_id = IWL_MVM_INVALID_STA;
 		mvmvif->link[link_id]->fw_link_id = IWL_MVM_FW_LINK_ID_INVALID;

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -355,7 +355,6 @@ struct iwl_mvm_vif_link_info {
  * @csa_failed: CSA failed to schedule time event, report an error later
  * @csa_bcn_pending: indicates that we are waiting for a beacon on a new channel
  * @features: hw features active for this vif
- * @fw_active_links_num: the number of activated links
  */
 struct iwl_mvm_vif {
 	struct iwl_mvm *mvm;
@@ -439,8 +438,6 @@ struct iwl_mvm_vif {
 		struct ieee80211_key_conf __rcu *keys[2];
 	} bcn_prot;
 
-	u32 fw_active_links_num;
-
 	struct iwl_mvm_vif_link_info deflink;
 	struct iwl_mvm_vif_link_info *link[IEEE80211_MLD_MAX_NUM_LINKS];
 };