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
iwl_mvm_init_time_sync(struct iwl_time_sync_data * data)10 void iwl_mvm_init_time_sync(struct iwl_time_sync_data *data)
11 {
12 skb_queue_head_init(&data->frame_list);
13 }
14
iwl_mvm_is_skb_match(struct sk_buff * skb,u8 * addr,u8 dialog_token)15 static 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
iwl_mvm_time_sync_find_skb(struct iwl_mvm * mvm,u8 * addr,u8 dialog_token)33 static 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
iwl_mvm_get_64_bit(__le32 high,__le32 low)53 static 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
iwl_mvm_time_sync_msmt_event(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)58 void 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
iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)93 void 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
iwl_mvm_time_sync_config(struct iwl_mvm * mvm,const u8 * addr,u32 protocols)128 int 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