qcacld-3.0: Fallback to MLSR if partner scan entry is not found

If join ML-probe response doesn't have the per-STA profile for any
of the requesting partner and if the scan entry for that partner
is not found in the scan table, then host should fallback to MLSR
connection.

However, instead of checking the scan entry for the partner links
from the scan table, the driver validates if the partner info is
present in the ml_info of the assoc link scan entry. The assoc link
scan entry would always have the partner info(from RNR IE) even if
the scan entry of that partner is not found.

Directly look up the scan table for every partner link mac.

Change-Id: I896f09a99346459c70ecac8a207dd38b91b58ce2
CRs-Fixed: 3770034

core/mac/src/pe/lim/lim_api.c

@@ -3924,7 +3924,7 @@ lim_validate_probe_rsp_link_info(struct pe_session *session_entry,
 		if (!lim_match_link_info(ml_partner_info.partner_link_info[i].link_id,
 					 &ml_partner_info.partner_link_info[i].link_addr,
 					 &partner_info)) {
-			pe_err("Prb req link info does not match prb resp link info");
+			pe_err("Atleast one Per-STA profile is missing in the ML-probe response");
 			return QDF_STATUS_E_PROTO;
 		}
 	}
@@ -3958,61 +3958,16 @@ lim_clear_ml_partner_info(struct pe_session *session_entry)
 	partner_info->num_partner_links = 0;
 }
 
-static QDF_STATUS
-lim_compare_scan_entry_partner_info_with_join_req(struct mlo_partner_info
-						  *partner_info,
-						  struct partner_link_info
-						  *partner_link)
-{
-	int i;
-	int j;
-	struct mlo_link_info *partner_link_info;
-	struct partner_link_info *scan_info;
-	int num_matching_links = 0;
-	QDF_STATUS status = QDF_STATUS_E_FAILURE;
-
-	for (i = 0; i < WLAN_UMAC_MLO_MAX_VDEVS; i++) {
-		partner_link_info = &partner_info->partner_link_info[i];
-		for (j = 0; j < MLD_MAX_LINKS - 1; j++) {
-			scan_info = &partner_link[j];
-			if (!scan_info)
-				continue;
-			/*
-			 * do not compare if both have freq as zero
-			 */
-			if (scan_info->freq == 0)
-				continue;
-
-			if (scan_info->freq == partner_link_info->chan_freq) {
-				qdf_mem_cmp(partner_link_info->link_addr.bytes,
-					    scan_info->link_addr.bytes,
-					    QDF_MAC_ADDR_SIZE);
-				num_matching_links += 1;
-			}
-		}
-	}
-
-	if (partner_info->num_partner_links == num_matching_links) {
-		pe_debug("num of matching partner links %d",
-			 num_matching_links);
-		status = QDF_STATUS_SUCCESS;
-	}
-
-	return status;
-}
-
 static QDF_STATUS
 lim_check_scan_db_for_join_req_partner_info(struct pe_session *session_entry,
 					    struct mac_context *mac_ctx)
 {
 	struct join_req *lim_join_req;
 	struct wlan_objmgr_pdev *pdev;
-	struct partner_link_info *partner_link = NULL;
-	struct qdf_mac_addr qdf_bssid;
-	QDF_STATUS status = QDF_STATUS_E_FAILURE;
 	struct mlo_partner_info *partner_info;
-	uint16_t join_req_freq = 0;
-	struct scan_cache_entry *cache_entry;
+	struct mlo_link_info *link_info;
+	struct scan_cache_entry *partner_entry;
+	uint8_t i;
 
 	if (!session_entry) {
 		pe_err("session entry is NULL");
@@ -4036,47 +3991,23 @@ lim_check_scan_db_for_join_req_partner_info(struct pe_session *session_entry,
 		return QDF_STATUS_E_NULL_VALUE;
 	}
 
-	partner_link = qdf_mem_malloc(sizeof(struct partner_link_info) *
-			(MLD_MAX_LINKS - 1));
-
-	if (!partner_link)
-		return QDF_STATUS_E_FAILURE;
-
-	qdf_mem_copy(&qdf_bssid,
-		     &(lim_join_req->bssDescription.bssId),
-		     QDF_MAC_ADDR_SIZE);
-
-	join_req_freq = lim_join_req->bssDescription.chan_freq;
-
-	cache_entry = wlan_scan_get_scan_entry_by_mac_freq(pdev,
-							   &qdf_bssid,
-							   join_req_freq);
-
-	if (!cache_entry) {
-		pe_err("failed to get partner link info by mac addr");
-		status = QDF_STATUS_E_FAILURE;
-		goto free_mem;
-	}
-
-	qdf_mem_copy(partner_link, cache_entry->ml_info.link_info,
-		     sizeof(struct partner_link_info) * (MLD_MAX_LINKS - 1));
-
-	util_scan_free_cache_entry(cache_entry);
-
 	partner_info = &lim_join_req->partner_info;
-
-	status = lim_compare_scan_entry_partner_info_with_join_req(
-			partner_info, partner_link);
-
-	if (!QDF_IS_STATUS_SUCCESS(status)) {
-		pe_err("failed to match num of partner links in scan entry");
-		status = QDF_STATUS_E_FAILURE;
-		goto free_mem;
+	for (i = 0; i < partner_info->num_partner_links; i++) {
+		link_info = &partner_info->partner_link_info[i];
+		partner_entry =
+			wlan_scan_get_entry_by_bssid(pdev,
+						     &link_info->link_addr);
+		if (!partner_entry) {
+			pe_err("Scan entry is not found for partner link %d "
+			       QDF_MAC_ADDR_FMT,
+			       link_info->link_id,
+			       QDF_MAC_ADDR_REF(link_info->link_addr.bytes));
+			return QDF_STATUS_E_FAILURE;
+		}
+		util_scan_free_cache_entry(partner_entry);
 	}
 
-free_mem:
-	qdf_mem_free(partner_link);
-	return status;
+	return QDF_STATUS_SUCCESS;
 }
 
 QDF_STATUS lim_update_mlo_mgr_info(struct mac_context *mac_ctx,