wifi: ath12k: support ARP and NS offload

Support ARP and NS offload in WoW state.

Tested this way: put machine A with QCA6390 to WoW state,
ping/ping6 machine A from another machine B, check sniffer to see
any ARP response and Neighbor Advertisement from machine A.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://patch.msgid.link/20240604055407.12506-7-quic_bqiang@quicinc.com

drivers/net/wireless/ath/ath12k/mac.c

@@ -6,6 +6,7 @@
 
 #include <net/mac80211.h>
 #include <linux/etherdevice.h>
+
 #include "mac.h"
 #include "core.h"
 #include "debug.h"

drivers/net/wireless/ath/ath12k/wmi.c

@@ -7783,3 +7783,151 @@ int ath12k_wmi_wow_config_pno(struct ath12k *ar, u32 vdev_id,
 
 	return ath12k_wmi_cmd_send(ar->wmi, skb, WMI_NETWORK_LIST_OFFLOAD_CONFIG_CMDID);
 }
+
+static void ath12k_wmi_fill_ns_offload(struct ath12k *ar,
+				       struct wmi_arp_ns_offload_arg *offload,
+				       void **ptr,
+				       bool enable,
+				       bool ext)
+{
+	struct wmi_ns_offload_params *ns;
+	struct wmi_tlv *tlv;
+	void *buf_ptr = *ptr;
+	u32 ns_cnt, ns_ext_tuples;
+	int i, max_offloads;
+
+	ns_cnt = offload->ipv6_count;
+
+	tlv  = buf_ptr;
+
+	if (ext) {
+		ns_ext_tuples = offload->ipv6_count - WMI_MAX_NS_OFFLOADS;
+		tlv->header = ath12k_wmi_tlv_hdr(WMI_TAG_ARRAY_STRUCT,
+						 ns_ext_tuples * sizeof(*ns));
+		i = WMI_MAX_NS_OFFLOADS;
+		max_offloads = offload->ipv6_count;
+	} else {
+		tlv->header = ath12k_wmi_tlv_hdr(WMI_TAG_ARRAY_STRUCT,
+						 WMI_MAX_NS_OFFLOADS * sizeof(*ns));
+		i = 0;
+		max_offloads = WMI_MAX_NS_OFFLOADS;
+	}
+
+	buf_ptr += sizeof(*tlv);
+
+	for (; i < max_offloads; i++) {
+		ns = buf_ptr;
+		ns->tlv_header = ath12k_wmi_tlv_cmd_hdr(WMI_TAG_NS_OFFLOAD_TUPLE,
+							sizeof(*ns));
+
+		if (enable) {
+			if (i < ns_cnt)
+				ns->flags |= cpu_to_le32(WMI_NSOL_FLAGS_VALID);
+
+			memcpy(ns->target_ipaddr[0], offload->ipv6_addr[i], 16);
+			memcpy(ns->solicitation_ipaddr, offload->self_ipv6_addr[i], 16);
+
+			if (offload->ipv6_type[i])
+				ns->flags |= cpu_to_le32(WMI_NSOL_FLAGS_IS_IPV6_ANYCAST);
+
+			memcpy(ns->target_mac.addr, offload->mac_addr, ETH_ALEN);
+
+			if (!is_zero_ether_addr(ns->target_mac.addr))
+				ns->flags |= cpu_to_le32(WMI_NSOL_FLAGS_MAC_VALID);
+
+			ath12k_dbg(ar->ab, ATH12K_DBG_WMI,
+				   "wmi index %d ns_solicited %pI6 target %pI6",
+				   i, ns->solicitation_ipaddr,
+				   ns->target_ipaddr[0]);
+		}
+
+		buf_ptr += sizeof(*ns);
+	}
+
+	*ptr = buf_ptr;
+}
+
+static void ath12k_wmi_fill_arp_offload(struct ath12k *ar,
+					struct wmi_arp_ns_offload_arg *offload,
+					void **ptr,
+					bool enable)
+{
+	struct wmi_arp_offload_params *arp;
+	struct wmi_tlv *tlv;
+	void *buf_ptr = *ptr;
+	int i;
+
+	/* fill arp tuple */
+	tlv = buf_ptr;
+	tlv->header = ath12k_wmi_tlv_hdr(WMI_TAG_ARRAY_STRUCT,
+					 WMI_MAX_ARP_OFFLOADS * sizeof(*arp));
+	buf_ptr += sizeof(*tlv);
+
+	for (i = 0; i < WMI_MAX_ARP_OFFLOADS; i++) {
+		arp = buf_ptr;
+		arp->tlv_header = ath12k_wmi_tlv_cmd_hdr(WMI_TAG_ARP_OFFLOAD_TUPLE,
+							 sizeof(*arp));
+
+		if (enable && i < offload->ipv4_count) {
+			/* Copy the target ip addr and flags */
+			arp->flags = cpu_to_le32(WMI_ARPOL_FLAGS_VALID);
+			memcpy(arp->target_ipaddr, offload->ipv4_addr[i], 4);
+
+			ath12k_dbg(ar->ab, ATH12K_DBG_WMI, "wmi arp offload address %pI4",
+				   arp->target_ipaddr);
+		}
+
+		buf_ptr += sizeof(*arp);
+	}
+
+	*ptr = buf_ptr;
+}
+
+int ath12k_wmi_arp_ns_offload(struct ath12k *ar,
+			      struct ath12k_vif *arvif,
+			      struct wmi_arp_ns_offload_arg *offload,
+			      bool enable)
+{
+	struct wmi_set_arp_ns_offload_cmd *cmd;
+	struct wmi_tlv *tlv;
+	struct sk_buff *skb;
+	void *buf_ptr;
+	size_t len;
+	u8 ns_cnt, ns_ext_tuples = 0;
+
+	ns_cnt = offload->ipv6_count;
+
+	len = sizeof(*cmd) +
+	      sizeof(*tlv) +
+	      WMI_MAX_NS_OFFLOADS * sizeof(struct wmi_ns_offload_params) +
+	      sizeof(*tlv) +
+	      WMI_MAX_ARP_OFFLOADS * sizeof(struct wmi_arp_offload_params);
+
+	if (ns_cnt > WMI_MAX_NS_OFFLOADS) {
+		ns_ext_tuples = ns_cnt - WMI_MAX_NS_OFFLOADS;
+		len += sizeof(*tlv) +
+		       ns_ext_tuples * sizeof(struct wmi_ns_offload_params);
+	}
+
+	skb = ath12k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
+	if (!skb)
+		return -ENOMEM;
+
+	buf_ptr = skb->data;
+	cmd = buf_ptr;
+	cmd->tlv_header = ath12k_wmi_tlv_cmd_hdr(WMI_TAG_SET_ARP_NS_OFFLOAD_CMD,
+						 sizeof(*cmd));
+	cmd->flags = cpu_to_le32(0);
+	cmd->vdev_id = cpu_to_le32(arvif->vdev_id);
+	cmd->num_ns_ext_tuples = cpu_to_le32(ns_ext_tuples);
+
+	buf_ptr += sizeof(*cmd);
+
+	ath12k_wmi_fill_ns_offload(ar, offload, &buf_ptr, enable, 0);
+	ath12k_wmi_fill_arp_offload(ar, offload, &buf_ptr, enable);
+
+	if (ns_ext_tuples)
+		ath12k_wmi_fill_ns_offload(ar, offload, &buf_ptr, enable, 1);
+
+	return ath12k_wmi_cmd_send(ar->wmi, skb, WMI_SET_ARP_NS_OFFLOAD_CMDID);
+}

drivers/net/wireless/ath/ath12k/wmi.h

@@ -24,6 +24,7 @@
 
 struct ath12k_base;
 struct ath12k;
+struct ath12k_vif;
 
 /* There is no signed version of __le32, so for a temporary solution come
  * up with our own version. The idea is from fs/ntfs/endian.h.
@@ -5313,6 +5314,66 @@ struct wmi_hw_data_filter_arg {
 	u32 hw_filter_bitmap;
 };
 
+#define WMI_IPV6_UC_TYPE     0
+#define WMI_IPV6_AC_TYPE     1
+
+#define WMI_IPV6_MAX_COUNT   16
+#define WMI_IPV4_MAX_COUNT   2
+
+struct wmi_arp_ns_offload_arg {
+	u8  ipv4_addr[WMI_IPV4_MAX_COUNT][4];
+	u32 ipv4_count;
+	u32 ipv6_count;
+	u8  ipv6_addr[WMI_IPV6_MAX_COUNT][16];
+	u8  self_ipv6_addr[WMI_IPV6_MAX_COUNT][16];
+	u8  ipv6_type[WMI_IPV6_MAX_COUNT];
+	bool ipv6_valid[WMI_IPV6_MAX_COUNT];
+	u8  mac_addr[ETH_ALEN];
+};
+
+#define WMI_MAX_NS_OFFLOADS           2
+#define WMI_MAX_ARP_OFFLOADS          2
+
+#define WMI_ARPOL_FLAGS_VALID              BIT(0)
+#define WMI_ARPOL_FLAGS_MAC_VALID          BIT(1)
+#define WMI_ARPOL_FLAGS_REMOTE_IP_VALID    BIT(2)
+
+struct wmi_arp_offload_params {
+	__le32 tlv_header;
+	__le32 flags;
+	u8 target_ipaddr[4];
+	u8 remote_ipaddr[4];
+	struct ath12k_wmi_mac_addr_params target_mac;
+} __packed;
+
+#define WMI_NSOL_FLAGS_VALID               BIT(0)
+#define WMI_NSOL_FLAGS_MAC_VALID           BIT(1)
+#define WMI_NSOL_FLAGS_REMOTE_IP_VALID     BIT(2)
+#define WMI_NSOL_FLAGS_IS_IPV6_ANYCAST     BIT(3)
+
+#define WMI_NSOL_MAX_TARGET_IPS    2
+
+struct wmi_ns_offload_params {
+	__le32 tlv_header;
+	__le32 flags;
+	u8 target_ipaddr[WMI_NSOL_MAX_TARGET_IPS][16];
+	u8 solicitation_ipaddr[16];
+	u8 remote_ipaddr[16];
+	struct ath12k_wmi_mac_addr_params target_mac;
+} __packed;
+
+struct wmi_set_arp_ns_offload_cmd {
+	__le32 tlv_header;
+	__le32 flags;
+	__le32 vdev_id;
+	__le32 num_ns_ext_tuples;
+	/* The TLVs follow:
+	 * wmi_ns_offload_params  ns[WMI_MAX_NS_OFFLOADS];
+	 * wmi_arp_offload_params arp[WMI_MAX_ARP_OFFLOADS];
+	 * wmi_ns_offload_params  ns_ext[num_ns_ext_tuples];
+	 */
+} __packed;
+
 void ath12k_wmi_init_qcn9274(struct ath12k_base *ab,
 			     struct ath12k_wmi_resource_config_arg *config);
 void ath12k_wmi_init_wcn7850(struct ath12k_base *ab,
@@ -5478,4 +5539,9 @@ int ath12k_wmi_wow_config_pno(struct ath12k *ar, u32 vdev_id,
 			      struct wmi_pno_scan_req_arg  *pno_scan);
 int ath12k_wmi_hw_data_filter_cmd(struct ath12k *ar,
 				  struct wmi_hw_data_filter_arg *arg);
+int ath12k_wmi_arp_ns_offload(struct ath12k *ar,
+			      struct ath12k_vif *arvif,
+			      struct wmi_arp_ns_offload_arg *offload,
+			      bool enable);
+
 #endif

drivers/net/wireless/ath/ath12k/wow.c

@@ -5,6 +5,10 @@
  */
 
 #include <linux/delay.h>
+#include <linux/inetdevice.h>
+#include <net/addrconf.h>
+#include <net/if_inet6.h>
+#include <net/ipv6.h>
 
 #include "mac.h"
 
@@ -599,6 +603,179 @@ static int ath12k_wow_clear_hw_filter(struct ath12k *ar)
 	return 0;
 }
 
+static void ath12k_wow_generate_ns_mc_addr(struct ath12k_base *ab,
+					   struct wmi_arp_ns_offload_arg *offload)
+{
+	int i;
+
+	for (i = 0; i < offload->ipv6_count; i++) {
+		offload->self_ipv6_addr[i][0] = 0xff;
+		offload->self_ipv6_addr[i][1] = 0x02;
+		offload->self_ipv6_addr[i][11] = 0x01;
+		offload->self_ipv6_addr[i][12] = 0xff;
+		offload->self_ipv6_addr[i][13] =
+					offload->ipv6_addr[i][13];
+		offload->self_ipv6_addr[i][14] =
+					offload->ipv6_addr[i][14];
+		offload->self_ipv6_addr[i][15] =
+					offload->ipv6_addr[i][15];
+		ath12k_dbg(ab, ATH12K_DBG_WOW, "NS solicited addr %pI6\n",
+			   offload->self_ipv6_addr[i]);
+	}
+}
+
+static void ath12k_wow_prepare_ns_offload(struct ath12k_vif *arvif,
+					  struct wmi_arp_ns_offload_arg *offload)
+{
+	struct net_device *ndev = ieee80211_vif_to_wdev(arvif->vif)->netdev;
+	struct ath12k_base *ab = arvif->ar->ab;
+	struct inet6_ifaddr *ifa6;
+	struct ifacaddr6 *ifaca6;
+	struct inet6_dev *idev;
+	u32 count = 0, scope;
+
+	if (!ndev)
+		return;
+
+	idev = in6_dev_get(ndev);
+	if (!idev)
+		return;
+
+	ath12k_dbg(ab, ATH12K_DBG_WOW, "wow prepare ns offload\n");
+
+	read_lock_bh(&idev->lock);
+
+	/* get unicast address */
+	list_for_each_entry(ifa6, &idev->addr_list, if_list) {
+		if (count >= WMI_IPV6_MAX_COUNT)
+			goto unlock;
+
+		if (ifa6->flags & IFA_F_DADFAILED)
+			continue;
+
+		scope = ipv6_addr_src_scope(&ifa6->addr);
+		if (scope != IPV6_ADDR_SCOPE_LINKLOCAL &&
+		    scope != IPV6_ADDR_SCOPE_GLOBAL) {
+			ath12k_dbg(ab, ATH12K_DBG_WOW,
+				   "Unsupported ipv6 scope: %d\n", scope);
+			continue;
+		}
+
+		memcpy(offload->ipv6_addr[count], &ifa6->addr.s6_addr,
+		       sizeof(ifa6->addr.s6_addr));
+		offload->ipv6_type[count] = WMI_IPV6_UC_TYPE;
+		ath12k_dbg(ab, ATH12K_DBG_WOW, "mac count %d ipv6 uc %pI6 scope %d\n",
+			   count, offload->ipv6_addr[count],
+			   scope);
+		count++;
+	}
+
+	/* get anycast address */
+	rcu_read_lock();
+
+	for (ifaca6 = rcu_dereference(idev->ac_list); ifaca6;
+	     ifaca6 = rcu_dereference(ifaca6->aca_next)) {
+		if (count >= WMI_IPV6_MAX_COUNT) {
+			rcu_read_unlock();
+			goto unlock;
+		}
+
+		scope = ipv6_addr_src_scope(&ifaca6->aca_addr);
+		if (scope != IPV6_ADDR_SCOPE_LINKLOCAL &&
+		    scope != IPV6_ADDR_SCOPE_GLOBAL) {
+			ath12k_dbg(ab, ATH12K_DBG_WOW,
+				   "Unsupported ipv scope: %d\n", scope);
+			continue;
+		}
+
+		memcpy(offload->ipv6_addr[count], &ifaca6->aca_addr,
+		       sizeof(ifaca6->aca_addr));
+		offload->ipv6_type[count] = WMI_IPV6_AC_TYPE;
+		ath12k_dbg(ab, ATH12K_DBG_WOW, "mac count %d ipv6 ac %pI6 scope %d\n",
+			   count, offload->ipv6_addr[count],
+			   scope);
+		count++;
+	}
+
+	rcu_read_unlock();
+
+unlock:
+	read_unlock_bh(&idev->lock);
+
+	in6_dev_put(idev);
+
+	offload->ipv6_count = count;
+	ath12k_wow_generate_ns_mc_addr(ab, offload);
+}
+
+static void ath12k_wow_prepare_arp_offload(struct ath12k_vif *arvif,
+					   struct wmi_arp_ns_offload_arg *offload)
+{
+	struct ieee80211_vif *vif = arvif->vif;
+	struct ieee80211_vif_cfg vif_cfg = vif->cfg;
+	struct ath12k_base *ab = arvif->ar->ab;
+	u32 ipv4_cnt;
+
+	ath12k_dbg(ab, ATH12K_DBG_WOW, "wow prepare arp offload\n");
+
+	ipv4_cnt = min(vif_cfg.arp_addr_cnt, WMI_IPV4_MAX_COUNT);
+	memcpy(offload->ipv4_addr, vif_cfg.arp_addr_list, ipv4_cnt * sizeof(u32));
+	offload->ipv4_count = ipv4_cnt;
+
+	ath12k_dbg(ab, ATH12K_DBG_WOW,
+		   "wow arp_addr_cnt %d vif->addr %pM, offload_addr %pI4\n",
+		   vif_cfg.arp_addr_cnt, vif->addr, offload->ipv4_addr);
+}
+
+static int ath12k_wow_arp_ns_offload(struct ath12k *ar, bool enable)
+{
+	struct wmi_arp_ns_offload_arg *offload;
+	struct ath12k_vif *arvif;
+	int ret;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	offload = kmalloc(sizeof(*offload), GFP_KERNEL);
+	if (!offload)
+		return -ENOMEM;
+
+	list_for_each_entry(arvif, &ar->arvifs, list) {
+		if (arvif->vdev_type != WMI_VDEV_TYPE_STA)
+			continue;
+
+		memset(offload, 0, sizeof(*offload));
+
+		memcpy(offload->mac_addr, arvif->vif->addr, ETH_ALEN);
+		ath12k_wow_prepare_ns_offload(arvif, offload);
+		ath12k_wow_prepare_arp_offload(arvif, offload);
+
+		ret = ath12k_wmi_arp_ns_offload(ar, arvif, offload, enable);
+		if (ret) {
+			ath12k_warn(ar->ab, "failed to set arp ns offload vdev %i: enable %d, ret %d\n",
+				    arvif->vdev_id, enable, ret);
+			return ret;
+		}
+	}
+
+	kfree(offload);
+
+	return 0;
+}
+
+static int ath12k_wow_protocol_offload(struct ath12k *ar, bool enable)
+{
+	int ret;
+
+	ret = ath12k_wow_arp_ns_offload(ar, enable);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to offload ARP and NS %d %d\n",
+			    enable, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 int ath12k_wow_op_suspend(struct ieee80211_hw *hw,
 			  struct cfg80211_wowlan *wowlan)
 {
@@ -622,6 +799,13 @@ int ath12k_wow_op_suspend(struct ieee80211_hw *hw,
 		goto cleanup;
 	}
 
+	ret = ath12k_wow_protocol_offload(ar, true);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to set wow protocol offload events: %d\n",
+			    ret);
+		goto cleanup;
+	}
+
 	ret = ath12k_mac_wait_tx_complete(ar);
 	if (ret) {
 		ath12k_warn(ar->ab, "failed to wait tx complete: %d\n", ret);
@@ -708,6 +892,13 @@ int ath12k_wow_op_resume(struct ieee80211_hw *hw)
 		goto exit;
 	}
 
+	ret = ath12k_wow_protocol_offload(ar, false);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to clear wow protocol offload events: %d\n",
+			    ret);
+		goto exit;
+	}
+
 exit:
 	if (ret) {
 		switch (ah->state) {