1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright (C) 2022 Intel Corporation
4 */
5
6#include "mvm.h"
7#include "time-sync.h"
8#include <linux/ieee80211.h>
9
10void iwl_mvm_init_time_sync(struct iwl_time_sync_data *data)
11{
12	skb_queue_head_init(&data->frame_list);
13}
14
15static bool iwl_mvm_is_skb_match(struct sk_buff *skb, u8 *addr, u8 dialog_token)
16{
17	struct ieee80211_mgmt *mgmt = (void *)skb->data;
18	u8 skb_dialog_token;
19
20	if (ieee80211_is_timing_measurement(skb))
21		skb_dialog_token = mgmt->u.action.u.wnm_timing_msr.dialog_token;
22	else
23		skb_dialog_token = mgmt->u.action.u.ftm.dialog_token;
24
25	if ((ether_addr_equal(mgmt->sa, addr) ||
26	     ether_addr_equal(mgmt->da, addr)) &&
27	    skb_dialog_token == dialog_token)
28		return true;
29
30	return false;
31}
32
33static struct sk_buff *iwl_mvm_time_sync_find_skb(struct iwl_mvm *mvm, u8 *addr,
34						  u8 dialog_token)
35{
36	struct sk_buff *skb;
37
38	/* The queue is expected to have only one SKB. If there are other SKBs
39	 * in the queue, they did not get a time sync notification and are
40	 * probably obsolete by now, so drop them.
41	 */
42	while ((skb = skb_dequeue(&mvm->time_sync.frame_list))) {
43		if (iwl_mvm_is_skb_match(skb, addr, dialog_token))
44			break;
45
46		kfree_skb(skb);
47		skb = NULL;
48	}
49
50	return skb;
51}
52
53static u64 iwl_mvm_get_64_bit(__le32 high, __le32 low)
54{
55	return ((u64)le32_to_cpu(high) << 32) | le32_to_cpu(low);
56}
57
58void iwl_mvm_time_sync_msmt_event(struct iwl_mvm *mvm,
59				  struct iwl_rx_cmd_buffer *rxb)
60{
61	struct iwl_rx_packet *pkt = rxb_addr(rxb);
62	struct iwl_time_msmt_notify *notif = (void *)pkt->data;
63	struct ieee80211_rx_status *rx_status;
64	struct skb_shared_hwtstamps *shwt;
65	u64 ts_10ns;
66	struct sk_buff *skb =
67		iwl_mvm_time_sync_find_skb(mvm, notif->peer_addr,
68					   le32_to_cpu(notif->dialog_token));
69	u64 adj_time;
70
71	if (!skb) {
72		IWL_DEBUG_INFO(mvm, "Time sync event but no pending skb\n");
73		return;
74	}
75
76	ts_10ns = iwl_mvm_get_64_bit(notif->t2_hi, notif->t2_lo);
77	adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
78	shwt = skb_hwtstamps(skb);
79	shwt->hwtstamp = ktime_set(0, adj_time);
80
81	ts_10ns = iwl_mvm_get_64_bit(notif->t3_hi, notif->t3_lo);
82	adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
83	rx_status = IEEE80211_SKB_RXCB(skb);
84	rx_status->ack_tx_hwtstamp = ktime_set(0, adj_time);
85
86	IWL_DEBUG_INFO(mvm,
87		       "Time sync: RX event - report frame t2=%llu t3=%llu\n",
88		       ktime_to_ns(shwt->hwtstamp),
89		       ktime_to_ns(rx_status->ack_tx_hwtstamp));
90	ieee80211_rx_napi(mvm->hw, NULL, skb, NULL);
91}
92
93void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
94					  struct iwl_rx_cmd_buffer *rxb)
95{
96	struct iwl_rx_packet *pkt = rxb_addr(rxb);
97	struct iwl_time_msmt_cfm_notify *notif = (void *)pkt->data;
98	struct ieee80211_tx_status status = {};
99	struct skb_shared_hwtstamps *shwt;
100	u64 ts_10ns, adj_time;
101
102	status.skb =
103		iwl_mvm_time_sync_find_skb(mvm, notif->peer_addr,
104					   le32_to_cpu(notif->dialog_token));
105
106	if (!status.skb) {
107		IWL_DEBUG_INFO(mvm, "Time sync confirm but no pending skb\n");
108		return;
109	}
110
111	ts_10ns = iwl_mvm_get_64_bit(notif->t1_hi, notif->t1_lo);
112	adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
113	shwt = skb_hwtstamps(status.skb);
114	shwt->hwtstamp = ktime_set(0, adj_time);
115
116	ts_10ns = iwl_mvm_get_64_bit(notif->t4_hi, notif->t4_lo);
117	adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
118	status.info = IEEE80211_SKB_CB(status.skb);
119	status.ack_hwtstamp = ktime_set(0, adj_time);
120
121	IWL_DEBUG_INFO(mvm,
122		       "Time sync: TX event - report frame t1=%llu t4=%llu\n",
123		       ktime_to_ns(shwt->hwtstamp),
124		       ktime_to_ns(status.ack_hwtstamp));
125	ieee80211_tx_status_ext(mvm->hw, &status);
126}
127
128int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, const u8 *addr, u32 protocols)
129{
130	struct iwl_time_sync_cfg_cmd cmd = {};
131	int err;
132
133	lockdep_assert_held(&mvm->mutex);
134
135	if (!fw_has_capa(&mvm->fw->ucode_capa,
136			 IWL_UCODE_TLV_CAPA_TIME_SYNC_BOTH_FTM_TM))
137		return -EINVAL;
138
139	/* The fw only supports one peer. We do allow reconfiguration of the
140	 * same peer for cases of fw reset etc.
141	 */
142	if (mvm->time_sync.active &&
143	    !ether_addr_equal(addr, mvm->time_sync.peer_addr)) {
144		IWL_DEBUG_INFO(mvm, "Time sync: reject config for peer: %pM\n",
145			       addr);
146		return -ENOBUFS;
147	}
148
149	if (protocols & ~(IWL_TIME_SYNC_PROTOCOL_TM |
150			  IWL_TIME_SYNC_PROTOCOL_FTM))
151		return -EINVAL;
152
153	cmd.protocols = cpu_to_le32(protocols);
154
155	ether_addr_copy(cmd.peer_addr, addr);
156
157	err = iwl_mvm_send_cmd_pdu(mvm,
158				   WIDE_ID(DATA_PATH_GROUP,
159					   WNM_80211V_TIMING_MEASUREMENT_CONFIG_CMD),
160				   0, sizeof(cmd), &cmd);
161	if (err) {
162		IWL_ERR(mvm, "Failed to send time sync cfg cmd: %d\n", err);
163	} else {
164		mvm->time_sync.active = protocols != 0;
165		ether_addr_copy(mvm->time_sync.peer_addr, addr);
166		IWL_DEBUG_INFO(mvm, "Time sync: set peer addr=%pM\n", addr);
167	}
168
169	if (!mvm->time_sync.active)
170		skb_queue_purge(&mvm->time_sync.frame_list);
171
172	return err;
173}
174