qtnfmac: enable multiple SSIDs scan support

Enable support for multiple SSIDs scans. Get max number of supported
SSIDs from firmware and report to cfg80211 core.
Signed-off-by: Andrey Shevchenko <ashevchenko@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -995,7 +995,8 @@ int qtnf_wiphy_register(struct qtnf_hw_info *hw_info, struct qtnf_wmac *mac)
 	wiphy->retry_long = macinfo->lretry_limit;
 	wiphy->coverage_class = macinfo->coverage_class;
 
-	wiphy->max_scan_ssids = QTNF_MAX_SSID_LIST_LENGTH;
+	wiphy->max_scan_ssids =
+		(hw_info->max_scan_ssids) ? hw_info->max_scan_ssids : 1;
 	wiphy->max_scan_ie_len = QTNF_MAX_VSIE_LEN;
 	wiphy->mgmt_stypes = qtnf_mgmt_stypes;
 	wiphy->max_remain_on_channel_duration = 5000;

drivers/net/wireless/quantenna/qtnfmac/commands.c

@@ -1092,6 +1092,9 @@ qtnf_cmd_resp_proc_hw_info(struct qtnf_bus *bus,
 		case QTN_TLV_ID_UBOOT_VER:
 			uboot_ver = (const void *)tlv->val;
 			break;
+		case QTN_TLV_ID_MAX_SCAN_SSIDS:
+			hwinfo->max_scan_ssids = *tlv->val;
+			break;
 		default:
 			break;
 		}
@@ -2260,11 +2263,6 @@ int qtnf_cmd_send_scan(struct qtnf_wmac *mac)
 	int count = 0;
 	int ret;
 
-	if (scan_req->n_ssids > QTNF_MAX_SSID_LIST_LENGTH) {
-		pr_err("MAC%u: too many SSIDs in scan request\n", mac->macid);
-		return -EINVAL;
-	}
-
 	cmd_skb = qtnf_cmd_alloc_new_cmdskb(mac->macid, QLINK_VIFID_RSVD,
 					    QLINK_CMD_SCAN,
 					    sizeof(struct qlink_cmd));

drivers/net/wireless/quantenna/qtnfmac/core.h

@@ -40,7 +40,6 @@
 #undef pr_fmt
 #define pr_fmt(fmt)	KBUILD_MODNAME ": %s: " fmt, __func__
 
-#define QTNF_MAX_SSID_LIST_LENGTH	2
 #define QTNF_MAX_VSIE_LEN		255
 #define QTNF_MAX_INTF			8
 #define QTNF_MAX_EVENT_QUEUE_LEN	255
@@ -145,6 +144,7 @@ struct qtnf_hw_info {
 	u8 total_rx_chain;
 	char fw_version[ETHTOOL_FWVERS_LEN];
 	u32 hw_version;
+	u8 max_scan_ssids;
 };
 
 struct qtnf_vif *qtnf_mac_get_free_vif(struct qtnf_wmac *mac);

drivers/net/wireless/quantenna/qtnfmac/qlink.h

@@ -1091,6 +1091,8 @@ struct qlink_event_radar {
  * @QTN_TLV_ID_STA_STATS: per-STA statistics as defined by
  *	&struct qlink_sta_stats. Valid values are marked as such in a bitmap
  *	carried by QTN_TLV_ID_STA_STATS_MAP.
+ * @QTN_TLV_ID_MAX_SCAN_SSIDS: maximum number of SSIDs the device can scan
+ *	for in any given scan.
  */
 enum qlink_tlv_id {
 	QTN_TLV_ID_FRAG_THRESH		= 0x0201,
@@ -1119,6 +1121,7 @@ enum qlink_tlv_id {
 	QTN_TLV_ID_CALIBRATION_VER	= 0x0406,
 	QTN_TLV_ID_UBOOT_VER		= 0x0407,
 	QTN_TLV_ID_RANDOM_MAC_ADDR	= 0x0408,
+	QTN_TLV_ID_MAX_SCAN_SSIDS	= 0x0409,
 };
 
 struct qlink_tlv_hdr {