wifi: ath12k: support GTK rekey offload

Host sets GTK related info to firmware before WoW is enabled, and
gets rekey replay_count and then disables GTK rekey when WoW quits.

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/20240604055407.12506-8-quic_bqiang@quicinc.com

1 files changed, 112 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index 8b80d5b6bc01..0e41386bca45 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -7091,6 +7091,56 @@ static void ath12k_wmi_event_wow_wakeup_host(struct ath12k_base *ab, struct sk_b
 	complete(&ab->wow.wakeup_completed);
 }
 
+static void ath12k_wmi_gtk_offload_status_event(struct ath12k_base *ab,
+						struct sk_buff *skb)
+{
+	const struct wmi_gtk_offload_status_event *ev;
+	struct ath12k_vif *arvif;
+	__be64 replay_ctr_be;
+	u64 replay_ctr;
+	const void **tb;
+	int ret;
+
+	tb = ath12k_wmi_tlv_parse_alloc(ab, skb, GFP_ATOMIC);
+	if (IS_ERR(tb)) {
+		ret = PTR_ERR(tb);
+		ath12k_warn(ab, "failed to parse tlv: %d\n", ret);
+		return;
+	}
+
+	ev = tb[WMI_TAG_GTK_OFFLOAD_STATUS_EVENT];
+	if (!ev) {
+		ath12k_warn(ab, "failed to fetch gtk offload status ev");
+		kfree(tb);
+		return;
+	}
+
+	rcu_read_lock();
+	arvif = ath12k_mac_get_arvif_by_vdev_id(ab, le32_to_cpu(ev->vdev_id));
+	if (!arvif) {
+		rcu_read_unlock();
+		ath12k_warn(ab, "failed to get arvif for vdev_id:%d\n",
+			    le32_to_cpu(ev->vdev_id));
+		kfree(tb);
+		return;
+	}
+
+	replay_ctr = le64_to_cpu(ev->replay_ctr);
+	arvif->rekey_data.replay_ctr = replay_ctr;
+	ath12k_dbg(ab, ATH12K_DBG_WMI, "wmi gtk offload event refresh_cnt %d replay_ctr %llu\n",
+		   le32_to_cpu(ev->refresh_cnt), replay_ctr);
+
+	/* supplicant expects big-endian replay counter */
+	replay_ctr_be = cpu_to_be64(replay_ctr);
+
+	ieee80211_gtk_rekey_notify(arvif->vif, arvif->bssid,
+				   (void *)&replay_ctr_be, GFP_ATOMIC);
+
+	rcu_read_unlock();
+
+	kfree(tb);
+}
+
 static void ath12k_wmi_op_rx(struct ath12k_base *ab, struct sk_buff *skb)
 {
 	struct wmi_cmd_hdr *cmd_hdr;
@@ -7214,6 +7264,9 @@ static void ath12k_wmi_op_rx(struct ath12k_base *ab, struct sk_buff *skb)
 	case WMI_WOW_WAKEUP_HOST_EVENTID:
 		ath12k_wmi_event_wow_wakeup_host(ab, skb);
 		break;
+	case WMI_GTK_OFFLOAD_STATUS_EVENTID:
+		ath12k_wmi_gtk_offload_status_event(ab, skb);
+		break;
 	/* TODO: Add remaining events */
 	default:
 		ath12k_dbg(ab, ATH12K_DBG_WMI, "Unknown eventid: 0x%x\n", id);
@@ -7931,3 +7984,62 @@ int ath12k_wmi_arp_ns_offload(struct ath12k *ar,
 
 	return ath12k_wmi_cmd_send(ar->wmi, skb, WMI_SET_ARP_NS_OFFLOAD_CMDID);
 }
+
+int ath12k_wmi_gtk_rekey_offload(struct ath12k *ar,
+				 struct ath12k_vif *arvif, bool enable)
+{
+	struct ath12k_rekey_data *rekey_data = &arvif->rekey_data;
+	struct wmi_gtk_rekey_offload_cmd *cmd;
+	struct sk_buff *skb;
+	__le64 replay_ctr;
+	int len;
+
+	len = sizeof(*cmd);
+	skb =  ath12k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = (struct wmi_gtk_rekey_offload_cmd *)skb->data;
+	cmd->tlv_header = ath12k_wmi_tlv_cmd_hdr(WMI_TAG_GTK_OFFLOAD_CMD, sizeof(*cmd));
+	cmd->vdev_id = cpu_to_le32(arvif->vdev_id);
+
+	if (enable) {
+		cmd->flags = cpu_to_le32(GTK_OFFLOAD_ENABLE_OPCODE);
+
+		/* the length in rekey_data and cmd is equal */
+		memcpy(cmd->kck, rekey_data->kck, sizeof(cmd->kck));
+		memcpy(cmd->kek, rekey_data->kek, sizeof(cmd->kek));
+
+		replay_ctr = cpu_to_le64(rekey_data->replay_ctr);
+		memcpy(cmd->replay_ctr, &replay_ctr,
+		       sizeof(replay_ctr));
+	} else {
+		cmd->flags = cpu_to_le32(GTK_OFFLOAD_DISABLE_OPCODE);
+	}
+
+	ath12k_dbg(ar->ab, ATH12K_DBG_WMI, "offload gtk rekey vdev: %d %d\n",
+		   arvif->vdev_id, enable);
+	return ath12k_wmi_cmd_send(ar->wmi, skb, WMI_GTK_OFFLOAD_CMDID);
+}
+
+int ath12k_wmi_gtk_rekey_getinfo(struct ath12k *ar,
+				 struct ath12k_vif *arvif)
+{
+	struct wmi_gtk_rekey_offload_cmd *cmd;
+	struct sk_buff *skb;
+	int len;
+
+	len = sizeof(*cmd);
+	skb =  ath12k_wmi_alloc_skb(ar->wmi->wmi_ab, len);
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = (struct wmi_gtk_rekey_offload_cmd *)skb->data;
+	cmd->tlv_header = ath12k_wmi_tlv_cmd_hdr(WMI_TAG_GTK_OFFLOAD_CMD, sizeof(*cmd));
+	cmd->vdev_id = cpu_to_le32(arvif->vdev_id);
+	cmd->flags = cpu_to_le32(GTK_OFFLOAD_REQUEST_STATUS_OPCODE);
+
+	ath12k_dbg(ar->ab, ATH12K_DBG_WMI, "get gtk rekey vdev_id: %d\n",
+		   arvif->vdev_id);
+	return ath12k_wmi_cmd_send(ar->wmi, skb, WMI_GTK_OFFLOAD_CMDID);
+}