wifi: brcmfmac: Add support for SCAN_V3

This is essentially identical to SCAN_V2 with an extra field where we
had a padding byte, so don't bother duplicating the entire structure.
Just add the field and the logic to set the version properly.

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -1093,6 +1093,7 @@ static void brcmf_scan_params_v2_to_v1(struct brcmf_scan_params_v2_le *params_v2
 }
 
 static void brcmf_escan_prep(struct brcmf_cfg80211_info *cfg,
+			     struct brcmf_if *ifp,
 			     struct brcmf_scan_params_v2_le *params_le,
 			     struct cfg80211_scan_request *request)
 {
@@ -1109,8 +1110,13 @@ static void brcmf_escan_prep(struct brcmf_cfg80211_info *cfg,
 
 	length = BRCMF_SCAN_PARAMS_V2_FIXED_SIZE;
 
-	params_le->version = cpu_to_le16(BRCMF_SCAN_PARAMS_VERSION_V2);
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V3))
+		params_le->version = cpu_to_le16(BRCMF_SCAN_PARAMS_VERSION_V3);
+	else
+		params_le->version = cpu_to_le16(BRCMF_SCAN_PARAMS_VERSION_V2);
+
 	params_le->bss_type = DOT11_BSSTYPE_ANY;
+	params_le->ssid_type = 0;
 	params_le->scan_type = cpu_to_le32(BRCMF_SCANTYPE_ACTIVE);
 	params_le->channel_num = 0;
 	params_le->nprobes = cpu_to_le32(-1);
@@ -1204,7 +1210,7 @@ s32 brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
 		/* Do a scan abort to stop the driver's scan engine */
 		brcmf_dbg(SCAN, "ABORT scan in firmware\n");
 
-		brcmf_escan_prep(cfg, &params_v2_le, NULL);
+		brcmf_escan_prep(cfg, ifp, &params_v2_le, NULL);
 
 		/* E-Scan (or anyother type) can be aborted by SCAN */
 		if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V2)) {
@@ -1464,11 +1470,13 @@ brcmf_run_escan(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp,
 		goto exit;
 	}
 	BUG_ON(params_size + sizeof("escan") >= BRCMF_DCMD_MEDLEN);
-	brcmf_escan_prep(cfg, &params->params_v2_le, request);
+	brcmf_escan_prep(cfg, ifp, &params->params_v2_le, request);
 
-	params->version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION_V2);
-
-	if (!brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V2)) {
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V3)) {
+		params->version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION_V3);
+	} else if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_SCAN_V2)) {
+		params->version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION_V2);
+	} else {
 		struct brcmf_escan_params_le *params_v1;
 
 		params_size -= BRCMF_SCAN_PARAMS_V2_FIXED_SIZE;

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.c

@@ -289,6 +289,7 @@ static int brcmf_feat_fwcap_debugfs_read(struct seq_file *seq, void *data)
 void brcmf_feat_attach(struct brcmf_pub *drvr)
 {
 	struct brcmf_if *ifp = brcmf_get_ifp(drvr, 0);
+	struct brcmf_wl_scan_version_le scan_ver;
 	struct brcmf_pno_macaddr_le pfn_mac;
 	struct brcmf_gscan_config gscan_cfg;
 	u32 wowl_cap;
@@ -339,7 +340,20 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
 		ifp->drvr->feat_flags |= BIT(BRCMF_FEAT_SCAN_RANDOM_MAC);
 
 	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_FWSUP, "sup_wpa");
-	brcmf_feat_iovar_int_get(ifp, BRCMF_FEAT_SCAN_V2, "scan_ver");
+
+	err = brcmf_fil_iovar_data_get(ifp, "scan_ver", &scan_ver, sizeof(scan_ver));
+	if (!err) {
+		int ver = le16_to_cpu(scan_ver.scan_ver_major);
+
+		if (ver == 2) {
+			ifp->drvr->feat_flags |= BIT(BRCMF_FEAT_SCAN_V2);
+		} else if (ver == 3) {
+			/* We consider SCAN_V3 a subtype of SCAN_V2 since the
+			 * structure is essentially the same.
+			 */
+			ifp->drvr->feat_flags |= BIT(BRCMF_FEAT_SCAN_V2) | BIT(BRCMF_FEAT_SCAN_V3);
+		}
+	}
 
 	brcmf_feat_wlc_version_overrides(drvr);
 	brcmf_feat_firmware_overrides(drvr);

drivers/net/wireless/broadcom/brcm80211/brcmfmac/feature.h

@@ -57,6 +57,7 @@
 	BRCMF_FEAT_DEF(FWAUTH) \
 	BRCMF_FEAT_DEF(DUMP_OBSS) \
 	BRCMF_FEAT_DEF(SCAN_V2) \
+	BRCMF_FEAT_DEF(SCAN_V3) \
 	BRCMF_FEAT_DEF(PMKID_V2) \
 	BRCMF_FEAT_DEF(PMKID_V3) \
 	BRCMF_FEAT_DEF(SAE_EXT)

drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h

@@ -52,6 +52,7 @@
 
 /* version of brcmf_scan_params structure */
 #define BRCMF_SCAN_PARAMS_VERSION_V2	2
+#define BRCMF_SCAN_PARAMS_VERSION_V3	3
 
 /* masks for channel and ssid count */
 #define BRCMF_SCAN_PARAMS_COUNT_MASK	0x0000ffff
@@ -72,6 +73,7 @@
 #define DOT11_BSSTYPE_ANY		2
 #define BRCMF_ESCAN_REQ_VERSION		1
 #define BRCMF_ESCAN_REQ_VERSION_V2	2
+#define BRCMF_ESCAN_REQ_VERSION_V3	3
 
 #define BRCMF_MAXRATES_IN_SET		16	/* max # of rates in rateset */
 
@@ -414,7 +416,7 @@ struct brcmf_scan_params_v2_le {
 	s8 bss_type;		/* default: any,
 				 * DOT11_BSSTYPE_ANY/INFRASTRUCTURE/INDEPENDENT
 				 */
-	u8 pad;
+	u8 ssid_type;		/* v3 only */
 	__le32 scan_type;	/* flags, 0 use default */
 	__le32 nprobes;		/* -1 use default, number of probes per channel */
 	__le32 active_time;	/* -1 use default, dwell time per channel for
@@ -833,6 +835,17 @@ struct brcmf_wlc_version_le {
 	__le16 wlc_ver_minor;
 };
 
+/**
+ * struct brcmf_wl_scan_version_le - scan interface version
+ */
+struct brcmf_wl_scan_version_le {
+        __le16  version;
+        __le16  length;
+        __le16  scan_ver_major;
+};
+
+#define BRCMF_WL_SCAN_VERSION_VERSION 1
+
 /**
  * struct brcmf_assoclist_le - request assoc list.
  *