ath11k: Add basic WoW functionalities

Implement basic WoW functionalities such as magic-packet, disconnect
and pattern. The logic is very similar to ath10k.

When WoW is configured, ath11k_core_suspend and ath11k_core_resume
are skipped as WoW configuration and hif suspend/resume are done in
ath11k_wow_op_suspend() and ath11k_wow_op_resume().

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: Baochen Qiang <quic_bqiang@quicinc.com>
Signed-off-by: Wen Gong <quic_wgong@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/1644308006-22784-2-git-send-email-quic_cjhuang@quicinc.com

1 files changed, 414 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath11k/wow.c b/drivers/net/wireless/ath/ath11k/wow.c
index 43c62e99dd0e..837dab469ab2 100644
--- a/drivers/net/wireless/ath/ath11k/wow.c
+++ b/drivers/net/wireless/ath/ath11k/wow.c
@@ -6,12 +6,22 @@
 #include <linux/delay.h>
 
 #include "mac.h"
+
+#include <net/mac80211.h>
 #include "core.h"
 #include "hif.h"
 #include "debug.h"
 #include "wmi.h"
 #include "wow.h"
 
+static const struct wiphy_wowlan_support ath11k_wowlan_support = {
+	.flags = WIPHY_WOWLAN_DISCONNECT |
+		 WIPHY_WOWLAN_MAGIC_PKT,
+	.pattern_min_len = WOW_MIN_PATTERN_SIZE,
+	.pattern_max_len = WOW_MAX_PATTERN_SIZE,
+	.max_pkt_offset = WOW_MAX_PKT_OFFSET,
+};
+
 int ath11k_wow_enable(struct ath11k_base *ab)
 {
 	struct ath11k *ar = ath11k_ab_to_ar(ab, 0);
@@ -71,3 +81,407 @@ int ath11k_wow_wakeup(struct ath11k_base *ab)
 
 	return 0;
 }
+
+static int ath11k_wow_vif_cleanup(struct ath11k_vif *arvif)
+{
+	struct ath11k *ar = arvif->ar;
+	int i, ret;
+
+	for (i = 0; i < WOW_EVENT_MAX; i++) {
+		ret = ath11k_wmi_wow_add_wakeup_event(ar, arvif->vdev_id, i, 0);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to issue wow wakeup for event %s on vdev %i: %d\n",
+				    wow_wakeup_event(i), arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	for (i = 0; i < ar->wow.max_num_patterns; i++) {
+		ret = ath11k_wmi_wow_del_pattern(ar, arvif->vdev_id, i);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to delete wow pattern %d for vdev %i: %d\n",
+				    i, arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int ath11k_wow_cleanup(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_wow_vif_cleanup(arvif);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to clean wow wakeups on vdev %i: %d\n",
+				    arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+/* Convert a 802.3 format to a 802.11 format.
+ *         +------------+-----------+--------+----------------+
+ * 802.3:  |dest mac(6B)|src mac(6B)|type(2B)|     body...    |
+ *         +------------+-----------+--------+----------------+
+ *                |__         |_______    |____________  |________
+ *                   |                |                |          |
+ *         +--+------------+----+-----------+---------------+-----------+
+ * 802.11: |4B|dest mac(6B)| 6B |src mac(6B)|  8B  |type(2B)|  body...  |
+ *         +--+------------+----+-----------+---------------+-----------+
+ */
+static void ath11k_wow_convert_8023_to_80211(struct cfg80211_pkt_pattern *new,
+					     const struct cfg80211_pkt_pattern *old)
+{
+	u8 hdr_8023_pattern[ETH_HLEN] = {};
+	u8 hdr_8023_bit_mask[ETH_HLEN] = {};
+	u8 hdr_80211_pattern[WOW_HDR_LEN] = {};
+	u8 hdr_80211_bit_mask[WOW_HDR_LEN] = {};
+
+	int total_len = old->pkt_offset + old->pattern_len;
+	int hdr_80211_end_offset;
+
+	struct ieee80211_hdr_3addr *new_hdr_pattern =
+		(struct ieee80211_hdr_3addr *)hdr_80211_pattern;
+	struct ieee80211_hdr_3addr *new_hdr_mask =
+		(struct ieee80211_hdr_3addr *)hdr_80211_bit_mask;
+	struct ethhdr *old_hdr_pattern = (struct ethhdr *)hdr_8023_pattern;
+	struct ethhdr *old_hdr_mask = (struct ethhdr *)hdr_8023_bit_mask;
+	int hdr_len = sizeof(*new_hdr_pattern);
+
+	struct rfc1042_hdr *new_rfc_pattern =
+		(struct rfc1042_hdr *)(hdr_80211_pattern + hdr_len);
+	struct rfc1042_hdr *new_rfc_mask =
+		(struct rfc1042_hdr *)(hdr_80211_bit_mask + hdr_len);
+	int rfc_len = sizeof(*new_rfc_pattern);
+
+	memcpy(hdr_8023_pattern + old->pkt_offset,
+	       old->pattern, ETH_HLEN - old->pkt_offset);
+	memcpy(hdr_8023_bit_mask + old->pkt_offset,
+	       old->mask, ETH_HLEN - old->pkt_offset);
+
+	/* Copy destination address */
+	memcpy(new_hdr_pattern->addr1, old_hdr_pattern->h_dest, ETH_ALEN);
+	memcpy(new_hdr_mask->addr1, old_hdr_mask->h_dest, ETH_ALEN);
+
+	/* Copy source address */
+	memcpy(new_hdr_pattern->addr3, old_hdr_pattern->h_source, ETH_ALEN);
+	memcpy(new_hdr_mask->addr3, old_hdr_mask->h_source, ETH_ALEN);
+
+	/* Copy logic link type */
+	memcpy(&new_rfc_pattern->snap_type,
+	       &old_hdr_pattern->h_proto,
+	       sizeof(old_hdr_pattern->h_proto));
+	memcpy(&new_rfc_mask->snap_type,
+	       &old_hdr_mask->h_proto,
+	       sizeof(old_hdr_mask->h_proto));
+
+	/* Compute new pkt_offset */
+	if (old->pkt_offset < ETH_ALEN)
+		new->pkt_offset = old->pkt_offset +
+			offsetof(struct ieee80211_hdr_3addr, addr1);
+	else if (old->pkt_offset < offsetof(struct ethhdr, h_proto))
+		new->pkt_offset = old->pkt_offset +
+			offsetof(struct ieee80211_hdr_3addr, addr3) -
+			offsetof(struct ethhdr, h_source);
+	else
+		new->pkt_offset = old->pkt_offset + hdr_len + rfc_len - ETH_HLEN;
+
+	/* Compute new hdr end offset */
+	if (total_len > ETH_HLEN)
+		hdr_80211_end_offset = hdr_len + rfc_len;
+	else if (total_len > offsetof(struct ethhdr, h_proto))
+		hdr_80211_end_offset = hdr_len + rfc_len + total_len - ETH_HLEN;
+	else if (total_len > ETH_ALEN)
+		hdr_80211_end_offset = total_len - ETH_ALEN +
+			offsetof(struct ieee80211_hdr_3addr, addr3);
+	else
+		hdr_80211_end_offset = total_len +
+			offsetof(struct ieee80211_hdr_3addr, addr1);
+
+	new->pattern_len = hdr_80211_end_offset - new->pkt_offset;
+
+	memcpy((u8 *)new->pattern,
+	       hdr_80211_pattern + new->pkt_offset,
+	       new->pattern_len);
+	memcpy((u8 *)new->mask,
+	       hdr_80211_bit_mask + new->pkt_offset,
+	       new->pattern_len);
+
+	if (total_len > ETH_HLEN) {
+		/* Copy frame body */
+		memcpy((u8 *)new->pattern + new->pattern_len,
+		       (void *)old->pattern + ETH_HLEN - old->pkt_offset,
+		       total_len - ETH_HLEN);
+		memcpy((u8 *)new->mask + new->pattern_len,
+		       (void *)old->mask + ETH_HLEN - old->pkt_offset,
+		       total_len - ETH_HLEN);
+
+		new->pattern_len += total_len - ETH_HLEN;
+	}
+}
+
+static int ath11k_vif_wow_set_wakeups(struct ath11k_vif *arvif,
+				      struct cfg80211_wowlan *wowlan)
+{
+	int ret, i;
+	unsigned long wow_mask = 0;
+	struct ath11k *ar = arvif->ar;
+	const struct cfg80211_pkt_pattern *patterns = wowlan->patterns;
+	int pattern_id = 0;
+
+	/* Setup requested WOW features */
+	switch (arvif->vdev_type) {
+	case WMI_VDEV_TYPE_IBSS:
+		__set_bit(WOW_BEACON_EVENT, &wow_mask);
+		fallthrough;
+	case WMI_VDEV_TYPE_AP:
+		__set_bit(WOW_DEAUTH_RECVD_EVENT, &wow_mask);
+		__set_bit(WOW_DISASSOC_RECVD_EVENT, &wow_mask);
+		__set_bit(WOW_PROBE_REQ_WPS_IE_EVENT, &wow_mask);
+		__set_bit(WOW_AUTH_REQ_EVENT, &wow_mask);
+		__set_bit(WOW_ASSOC_REQ_EVENT, &wow_mask);
+		__set_bit(WOW_HTT_EVENT, &wow_mask);
+		__set_bit(WOW_RA_MATCH_EVENT, &wow_mask);
+		break;
+	case WMI_VDEV_TYPE_STA:
+		if (wowlan->disconnect) {
+			__set_bit(WOW_DEAUTH_RECVD_EVENT, &wow_mask);
+			__set_bit(WOW_DISASSOC_RECVD_EVENT, &wow_mask);
+			__set_bit(WOW_BMISS_EVENT, &wow_mask);
+			__set_bit(WOW_CSA_IE_EVENT, &wow_mask);
+		}
+
+		if (wowlan->magic_pkt)
+			__set_bit(WOW_MAGIC_PKT_RECVD_EVENT, &wow_mask);
+		break;
+	default:
+		break;
+	}
+
+	for (i = 0; i < wowlan->n_patterns; i++) {
+		u8 bitmask[WOW_MAX_PATTERN_SIZE] = {};
+		u8 ath_pattern[WOW_MAX_PATTERN_SIZE] = {};
+		u8 ath_bitmask[WOW_MAX_PATTERN_SIZE] = {};
+		struct cfg80211_pkt_pattern new_pattern = {};
+		struct cfg80211_pkt_pattern old_pattern = patterns[i];
+		int j;
+
+		new_pattern.pattern = ath_pattern;
+		new_pattern.mask = ath_bitmask;
+		if (patterns[i].pattern_len > WOW_MAX_PATTERN_SIZE)
+			continue;
+		/* convert bytemask to bitmask */
+		for (j = 0; j < patterns[i].pattern_len; j++)
+			if (patterns[i].mask[j / 8] & BIT(j % 8))
+				bitmask[j] = 0xff;
+		old_pattern.mask = bitmask;
+
+		if (ar->wmi->wmi_ab->wlan_resource_config.rx_decap_mode ==
+		    ATH11K_HW_TXRX_NATIVE_WIFI) {
+			if (patterns[i].pkt_offset < ETH_HLEN) {
+				u8 pattern_ext[WOW_MAX_PATTERN_SIZE] = {};
+
+				memcpy(pattern_ext, old_pattern.pattern,
+				       old_pattern.pattern_len);
+				old_pattern.pattern = pattern_ext;
+				ath11k_wow_convert_8023_to_80211(&new_pattern,
+								 &old_pattern);
+			} else {
+				new_pattern = old_pattern;
+				new_pattern.pkt_offset += WOW_HDR_LEN - ETH_HLEN;
+			}
+		}
+
+		if (WARN_ON(new_pattern.pattern_len > WOW_MAX_PATTERN_SIZE))
+			return -EINVAL;
+
+		ret = ath11k_wmi_wow_add_pattern(ar, arvif->vdev_id,
+						 pattern_id,
+						 new_pattern.pattern,
+						 new_pattern.mask,
+						 new_pattern.pattern_len,
+						 new_pattern.pkt_offset);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to add pattern %i to vdev %i: %d\n",
+				    pattern_id,
+				    arvif->vdev_id, ret);
+			return ret;
+		}
+
+		pattern_id++;
+		__set_bit(WOW_PATTERN_MATCH_EVENT, &wow_mask);
+	}
+
+	for (i = 0; i < WOW_EVENT_MAX; i++) {
+		if (!test_bit(i, &wow_mask))
+			continue;
+		ret = ath11k_wmi_wow_add_wakeup_event(ar, arvif->vdev_id, i, 1);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to enable wakeup event %s on vdev %i: %d\n",
+				    wow_wakeup_event(i), arvif->vdev_id, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int ath11k_wow_set_wakeups(struct ath11k *ar,
+				  struct cfg80211_wowlan *wowlan)
+{
+	struct ath11k_vif *arvif;
+	int ret;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	list_for_each_entry(arvif, &ar->arvifs, list) {
+		ret = ath11k_vif_wow_set_wakeups(arvif, wowlan);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to set wow wakeups 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)
+{
+	struct ath11k *ar = hw->priv;
+	int ret;
+
+	mutex_lock(&ar->conf_mutex);
+
+	ret =  ath11k_wow_cleanup(ar);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to clear wow wakeup events: %d\n",
+			    ret);
+		goto exit;
+	}
+
+	ret = ath11k_wow_set_wakeups(ar, wowlan);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to set wow wakeup events: %d\n",
+			    ret);
+		goto cleanup;
+	}
+
+	ret = ath11k_mac_wait_tx_complete(ar);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to wait tx complete: %d\n", ret);
+		goto cleanup;
+	}
+
+	ret = ath11k_wow_enable(ar->ab);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to start wow: %d\n", ret);
+		goto cleanup;
+	}
+
+	ath11k_ce_stop_shadow_timers(ar->ab);
+	ath11k_dp_stop_shadow_timers(ar->ab);
+
+	ath11k_hif_irq_disable(ar->ab);
+	ath11k_hif_ce_irq_disable(ar->ab);
+
+	ret = ath11k_hif_suspend(ar->ab);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to suspend hif: %d\n", ret);
+		goto wakeup;
+	}
+
+	goto exit;
+
+wakeup:
+	ath11k_wow_wakeup(ar->ab);
+
+cleanup:
+	ath11k_wow_cleanup(ar);
+
+exit:
+	mutex_unlock(&ar->conf_mutex);
+	return ret ? 1 : 0;
+}
+
+void ath11k_wow_op_set_wakeup(struct ieee80211_hw *hw, bool enabled)
+{
+	struct ath11k *ar = hw->priv;
+
+	mutex_lock(&ar->conf_mutex);
+	device_set_wakeup_enable(ar->ab->dev, enabled);
+	mutex_unlock(&ar->conf_mutex);
+}
+
+int ath11k_wow_op_resume(struct ieee80211_hw *hw)
+{
+	struct ath11k *ar = hw->priv;
+	int ret;
+
+	mutex_lock(&ar->conf_mutex);
+
+	ret = ath11k_hif_resume(ar->ab);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to resume hif: %d\n", ret);
+		goto exit;
+	}
+
+	ath11k_hif_ce_irq_enable(ar->ab);
+	ath11k_hif_irq_enable(ar->ab);
+
+	ret = ath11k_wow_wakeup(ar->ab);
+	if (ret)
+		ath11k_warn(ar->ab, "failed to wakeup from wow: %d\n", ret);
+
+exit:
+	if (ret) {
+		switch (ar->state) {
+		case ATH11K_STATE_ON:
+			ar->state = ATH11K_STATE_RESTARTING;
+			ret = 1;
+			break;
+		case ATH11K_STATE_OFF:
+		case ATH11K_STATE_RESTARTING:
+		case ATH11K_STATE_RESTARTED:
+		case ATH11K_STATE_WEDGED:
+			ath11k_warn(ar->ab, "encountered unexpected device state %d on resume, cannot recover\n",
+				    ar->state);
+			ret = -EIO;
+			break;
+		}
+	}
+
+	mutex_unlock(&ar->conf_mutex);
+	return ret;
+}
+
+int ath11k_wow_init(struct ath11k *ar)
+{
+	if (WARN_ON(!test_bit(WMI_TLV_SERVICE_WOW, ar->wmi->wmi_ab->svc_map)))
+		return -EINVAL;
+
+	ar->wow.wowlan_support = ath11k_wowlan_support;
+
+	if (ar->wmi->wmi_ab->wlan_resource_config.rx_decap_mode ==
+	    ATH11K_HW_TXRX_NATIVE_WIFI) {
+		ar->wow.wowlan_support.pattern_max_len -= WOW_MAX_REDUCE;
+		ar->wow.wowlan_support.max_pkt_offset -= WOW_MAX_REDUCE;
+	}
+
+	ar->wow.max_num_patterns = ATH11K_WOW_PATTERNS;
+	ar->wow.wowlan_support.n_patterns = ar->wow.max_num_patterns;
+	ar->hw->wiphy->wowlan = &ar->wow.wowlan_support;
+
+	device_set_wakeup_capable(ar->ab->dev, true);
+
+	return 0;
+}