brcmfmac: keep ARP and ND offload enabled during WOWL

Currently ARP and ND (IPv6 Neigbor Discovery) offload get disabled
on entering suspend. However when firmwares support the wowl_cap
iovar then these offload routines can be kept enabled as they
will work during WOWL as well.
Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

@@ -3556,6 +3556,7 @@ static s32 brcmf_cfg80211_resume(struct wiphy *wiphy)
 		brcmf_report_wowl_wakeind(wiphy, ifp);
 		brcmf_fil_iovar_int_set(ifp, "wowl_clear", 0);
 		brcmf_config_wowl_pattern(ifp, "clr", NULL, 0, NULL, 0);
+		if (!brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_ARP_ND))
 			brcmf_configure_arp_nd_offload(ifp, true);
 		brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PM,
 				      cfg->wowl.pre_pmmode);
@@ -3580,6 +3581,7 @@ static void brcmf_configure_wowl(struct brcmf_cfg80211_info *cfg,
 
 	brcmf_dbg(TRACE, "Suspend, wowl config.\n");
 
+	if (!brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL_ARP_ND))
 		brcmf_configure_arp_nd_offload(ifp, false);
 	brcmf_fil_cmd_int_get(ifp, BRCMF_C_GET_PM, &cfg->wowl.pre_pmmode);
 	brcmf_fil_cmd_int_set(ifp, BRCMF_C_SET_PM, PM_MAX);

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

@@ -147,6 +147,7 @@ void brcmf_feat_attach(struct brcmf_pub *drvr)
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_WOWL)) {
 		err = brcmf_fil_iovar_int_get(ifp, "wowl_cap", &wowl_cap);
 		if (!err) {
+			ifp->drvr->feat_flags |= BIT(BRCMF_FEAT_WOWL_ARP_ND);
 			if (wowl_cap & BRCMF_WOWL_PFN_FOUND)
 				ifp->drvr->feat_flags |=
 					BIT(BRCMF_FEAT_WOWL_ND);

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

@@ -29,6 +29,7 @@
  * SCAN_RANDOM_MAC: Random MAC during (net detect) scheduled scan.
  * WOWL_ND: WOWL net detect (PNO)
  * WOWL_GTK: (WOWL) GTK rekeying offload
+ * WOWL_ARP_ND: ARP and Neighbor Discovery offload support during WOWL.
  */
 #define BRCMF_FEAT_LIST \
 	BRCMF_FEAT_DEF(MBSS) \
@@ -40,7 +41,8 @@
 	BRCMF_FEAT_DEF(TDLS) \
 	BRCMF_FEAT_DEF(SCAN_RANDOM_MAC) \
 	BRCMF_FEAT_DEF(WOWL_ND) \
-	BRCMF_FEAT_DEF(WOWL_GTK)
+	BRCMF_FEAT_DEF(WOWL_GTK) \
+	BRCMF_FEAT_DEF(WOWL_ARP_ND)
 
 /*
  * Quirks: