brcmfmac: detect firmware support for radiotap monitor frames

Depending on used build-time options some firmwares may already include
radiotap header in passed monitor frames. Add a new feature flag to
store info about it. It's needed for proper handling of received frames
before passing them up.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -49,6 +49,7 @@ static const struct brcmf_feat_fwcap brcmf_fwcap_map[] = {
 	{ BRCMF_FEAT_MCHAN, "mchan" },
 	{ BRCMF_FEAT_P2P, "p2p" },
 	{ BRCMF_FEAT_MONITOR, "monitor" },
+	{ BRCMF_FEAT_MONITOR_FMT_RADIOTAP, "rtap" },
 };
 
 #ifdef DEBUG

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

@@ -34,6 +34,7 @@
  * GSCAN: enhanced scan offload feature.
  * FWSUP: Firmware supplicant.
  * MONITOR: firmware can pass monitor packets to host.
+ * MONITOR_FMT_RADIOTAP: firmware provides monitor packets with radiotap header
  */
 #define BRCMF_FEAT_LIST \
 	BRCMF_FEAT_DEF(MBSS) \
@@ -50,7 +51,8 @@
 	BRCMF_FEAT_DEF(MFP) \
 	BRCMF_FEAT_DEF(GSCAN) \
 	BRCMF_FEAT_DEF(FWSUP) \
-	BRCMF_FEAT_DEF(MONITOR)
+	BRCMF_FEAT_DEF(MONITOR) \
+	BRCMF_FEAT_DEF(MONITOR_FMT_RADIOTAP)
 
 /*
  * Quirks: