ath11k: implement hardware data filter

Host needs to set hardware data filter before entering WoW to
let firmware drop needless broadcast/mulitcast frames to avoid
frequent wakeup. Host clears hardware data filter when leaving WoW.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Signed-off-by: Carl Huang <quic_cjhuang@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1644308006-22784-4-git-send-email-quic_cjhuang@quicinc.com

drivers/net/wireless/ath/ath11k/wmi.c

@@ -8165,6 +8165,39 @@ void ath11k_wmi_detach(struct ath11k_base *ab)
 	ath11k_wmi_free_dbring_caps(ab);
 }
 
+int ath11k_wmi_hw_data_filter_cmd(struct ath11k *ar, u32 vdev_id,
+				  u32 filter_bitmap, bool enable)
+{
+	struct wmi_hw_data_filter_cmd *cmd;
+	struct sk_buff *skb;
+	int len;
+
+	len = sizeof(*cmd);
+	skb = ath11k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
+
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = (struct wmi_hw_data_filter_cmd *)skb->data;
+	cmd->tlv_header = FIELD_PREP(WMI_TLV_TAG, WMI_TAG_HW_DATA_FILTER_CMD) |
+			  FIELD_PREP(WMI_TLV_LEN, sizeof(*cmd) - TLV_HDR_SIZE);
+
+	cmd->vdev_id = vdev_id;
+	cmd->enable = enable;
+
+	/* Set all modes in case of disable */
+	if (cmd->enable)
+		cmd->hw_filter_bitmap = filter_bitmap;
+	else
+		cmd->hw_filter_bitmap = ((u32)~0U);
+
+	ath11k_dbg(ar->ab, ATH11K_DBG_WMI,
+		   "wmi hw data filter enable %d filter_bitmap 0x%x\n",
+		   enable, filter_bitmap);
+
+	return ath11k_wmi_cmd_send(ar->wmi, skb, WMI_HW_DATA_FILTER_CMDID);
+}
+
 int ath11k_wmi_wow_host_wakeup_ind(struct ath11k *ar)
 {
 	struct wmi_wow_host_wakeup_ind *cmd;

drivers/net/wireless/ath/ath11k/wmi.h

@@ -5390,6 +5390,19 @@ struct ath11k_wmi_base {
 	struct ath11k_targ_cap *targ_cap;
 };
 
+/* Definition of HW data filtering */
+enum hw_data_filter_type {
+	WMI_HW_DATA_FILTER_DROP_NON_ARP_BC = BIT(0),
+	WMI_HW_DATA_FILTER_DROP_NON_ICMPV6_MC = BIT(1),
+};
+
+struct wmi_hw_data_filter_cmd {
+	u32 tlv_header;
+	u32 vdev_id;
+	u32 enable;
+	u32 hw_filter_bitmap;
+} __packed;
+
 /* WOW structures */
 enum wmi_wow_wakeup_event {
 	WOW_BMISS_EVENT = 0,
@@ -5953,4 +5966,6 @@ int ath11k_wmi_wow_add_pattern(struct ath11k *ar, u32 vdev_id, u32 pattern_id,
 int ath11k_wmi_wow_add_wakeup_event(struct ath11k *ar, u32 vdev_id,
 				    enum wmi_wow_wakeup_event event,
 				    u32 enable);
+int ath11k_wmi_hw_data_filter_cmd(struct ath11k *ar, u32 vdev_id,
+				  u32 filter_bitmap, bool enable);
 #endif

drivers/net/wireless/ath/ath11k/wow.c

@@ -514,6 +514,50 @@ static int ath11k_wow_nlo_cleanup(struct ath11k *ar)
 	return 0;
 }
 
+static int ath11k_wow_set_hw_filter(struct ath11k *ar)
+{
+	struct ath11k_vif *arvif;
+	u32 bitmap;
+	int ret;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	list_for_each_entry(arvif, &ar->arvifs, list) {
+		bitmap = WMI_HW_DATA_FILTER_DROP_NON_ICMPV6_MC |
+			WMI_HW_DATA_FILTER_DROP_NON_ARP_BC;
+		ret = ath11k_wmi_hw_data_filter_cmd(ar, arvif->vdev_id,
+						    bitmap,
+						    true);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to set hw data filter on vdev %i: %d\n",
+				    arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int ath11k_wow_clear_hw_filter(struct ath11k *ar)
+{
+	struct ath11k_vif *arvif;
+	int ret;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	list_for_each_entry(arvif, &ar->arvifs, list) {
+		ret = ath11k_wmi_hw_data_filter_cmd(ar, arvif->vdev_id, 0, false);
+
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to clear hw data filter on vdev %i: %d\n",
+				    arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 int ath11k_wow_op_suspend(struct ieee80211_hw *hw,
 			  struct cfg80211_wowlan *wowlan)
 {
@@ -542,6 +586,13 @@ int ath11k_wow_op_suspend(struct ieee80211_hw *hw,
 		goto cleanup;
 	}
 
+	ret = ath11k_wow_set_hw_filter(ar);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to set hw filter: %d\n",
+			    ret);
+		goto cleanup;
+	}
+
 	ret = ath11k_wow_enable(ar->ab);
 	if (ret) {
 		ath11k_warn(ar->ab, "failed to start wow: %d\n", ret);
@@ -610,6 +661,12 @@ int ath11k_wow_op_resume(struct ieee80211_hw *hw)
 		goto exit;
 	}
 
+	ret = ath11k_wow_clear_hw_filter(ar);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to clear hw filter: %d\n", ret);
+		goto exit;
+	}
+
 exit:
 	if (ret) {
 		switch (ar->state) {