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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (C) 2025 Intel Corporation
*/
#include "mld.h"
#include "hcmd.h"
#include "ptp.h"
#include "time_sync.h"
#include <linux/ieee80211.h>
static int iwl_mld_init_time_sync(struct iwl_mld *mld, u32 protocols,
const u8 *addr)
{
struct iwl_mld_time_sync_data *time_sync = kzalloc(sizeof(*time_sync),
GFP_KERNEL);
if (!time_sync)
return -ENOMEM;
time_sync->active_protocols = protocols;
ether_addr_copy(time_sync->peer_addr, addr);
skb_queue_head_init(&time_sync->frame_list);
rcu_assign_pointer(mld->time_sync, time_sync);
return 0;
}
int iwl_mld_time_sync_fw_config(struct iwl_mld *mld)
{
struct iwl_time_sync_cfg_cmd cmd = {};
struct iwl_mld_time_sync_data *time_sync;
int err;
time_sync = wiphy_dereference(mld->wiphy, mld->time_sync);
if (!time_sync)
return -EINVAL;
cmd.protocols = cpu_to_le32(time_sync->active_protocols);
ether_addr_copy(cmd.peer_addr, time_sync->peer_addr);
err = iwl_mld_send_cmd_pdu(mld,
WIDE_ID(DATA_PATH_GROUP,
WNM_80211V_TIMING_MEASUREMENT_CONFIG_CMD),
&cmd);
if (err)
IWL_ERR(mld, "Failed to send time sync cfg cmd: %d\n", err);
return err;
}
int iwl_mld_time_sync_config(struct iwl_mld *mld, const u8 *addr, u32 protocols)
{
struct iwl_mld_time_sync_data *time_sync;
int err;
time_sync = wiphy_dereference(mld->wiphy, mld->time_sync);
/* The fw only supports one peer. We do allow reconfiguration of the
* same peer for cases of fw reset etc.
*/
if (time_sync && time_sync->active_protocols &&
!ether_addr_equal(addr, time_sync->peer_addr)) {
IWL_DEBUG_INFO(mld, "Time sync: reject config for peer: %pM\n",
addr);
return -ENOBUFS;
}
if (protocols & ~(IWL_TIME_SYNC_PROTOCOL_TM |
IWL_TIME_SYNC_PROTOCOL_FTM))
return -EINVAL;
IWL_DEBUG_INFO(mld, "Time sync: set peer addr=%pM\n", addr);
iwl_mld_deinit_time_sync(mld);
err = iwl_mld_init_time_sync(mld, protocols, addr);
if (err)
return err;
err = iwl_mld_time_sync_fw_config(mld);
return err;
}
void iwl_mld_deinit_time_sync(struct iwl_mld *mld)
{
struct iwl_mld_time_sync_data *time_sync =
wiphy_dereference(mld->wiphy, mld->time_sync);
if (!time_sync)
return;
RCU_INIT_POINTER(mld->time_sync, NULL);
skb_queue_purge(&time_sync->frame_list);
kfree_rcu(time_sync, rcu_head);
}
bool iwl_mld_time_sync_frame(struct iwl_mld *mld, struct sk_buff *skb, u8 *addr)
{
struct iwl_mld_time_sync_data *time_sync;
rcu_read_lock();
time_sync = rcu_dereference(mld->time_sync);
if (time_sync && ether_addr_equal(time_sync->peer_addr, addr) &&
(ieee80211_is_timing_measurement(skb) || ieee80211_is_ftm(skb))) {
skb_queue_tail(&time_sync->frame_list, skb);
rcu_read_unlock();
return true;
}
rcu_read_unlock();
return false;
}
static bool iwl_mld_is_skb_match(struct sk_buff *skb, u8 *addr, u8 dialog_token)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
u8 skb_dialog_token;
if (ieee80211_is_timing_measurement(skb))
skb_dialog_token = mgmt->u.action.u.wnm_timing_msr.dialog_token;
else
skb_dialog_token = mgmt->u.action.u.ftm.dialog_token;
if ((ether_addr_equal(mgmt->sa, addr) ||
ether_addr_equal(mgmt->da, addr)) &&
skb_dialog_token == dialog_token)
return true;
return false;
}
static struct sk_buff *iwl_mld_time_sync_find_skb(struct iwl_mld *mld, u8 *addr,
u8 dialog_token)
{
struct iwl_mld_time_sync_data *time_sync;
struct sk_buff *skb;
rcu_read_lock();
time_sync = rcu_dereference(mld->time_sync);
if (IWL_FW_CHECK(mld, !time_sync,
"Time sync notification but time sync is not initialized\n")) {
rcu_read_unlock();
return NULL;
}
/* The notifications are expected to arrive in the same order of the
* frames. If the incoming notification doesn't match the first SKB
* in the queue, it means there was no time sync notification for this
* SKB and it can be dropped.
*/
while ((skb = skb_dequeue(&time_sync->frame_list))) {
if (iwl_mld_is_skb_match(skb, addr, dialog_token))
break;
kfree_skb(skb);
skb = NULL;
IWL_DEBUG_DROP(mld,
"Time sync: drop SKB without matching notification\n");
}
rcu_read_unlock();
return skb;
}
static u64 iwl_mld_get_64_bit(__le32 high, __le32 low)
{
return ((u64)le32_to_cpu(high) << 32) | le32_to_cpu(low);
}
void iwl_mld_handle_time_msmt_notif(struct iwl_mld *mld,
struct iwl_rx_packet *pkt)
{
struct ptp_data *data = &mld->ptp_data;
struct iwl_time_msmt_notify *notif = (void *)pkt->data;
struct ieee80211_rx_status *rx_status;
struct skb_shared_hwtstamps *shwt;
u64 ts_10ns;
struct sk_buff *skb =
iwl_mld_time_sync_find_skb(mld, notif->peer_addr,
le32_to_cpu(notif->dialog_token));
u64 adj_time;
if (IWL_FW_CHECK(mld, !skb, "Time sync event but no pending skb\n"))
return;
spin_lock_bh(&data->lock);
ts_10ns = iwl_mld_get_64_bit(notif->t2_hi, notif->t2_lo);
adj_time = iwl_mld_ptp_get_adj_time(mld, ts_10ns * 10);
shwt = skb_hwtstamps(skb);
shwt->hwtstamp = ktime_set(0, adj_time);
ts_10ns = iwl_mld_get_64_bit(notif->t3_hi, notif->t3_lo);
adj_time = iwl_mld_ptp_get_adj_time(mld, ts_10ns * 10);
rx_status = IEEE80211_SKB_RXCB(skb);
rx_status->ack_tx_hwtstamp = ktime_set(0, adj_time);
spin_unlock_bh(&data->lock);
IWL_DEBUG_INFO(mld,
"Time sync: RX event - report frame t2=%llu t3=%llu\n",
ktime_to_ns(shwt->hwtstamp),
ktime_to_ns(rx_status->ack_tx_hwtstamp));
ieee80211_rx_napi(mld->hw, NULL, skb, NULL);
}
void iwl_mld_handle_time_sync_confirm_notif(struct iwl_mld *mld,
struct iwl_rx_packet *pkt)
{
struct ptp_data *data = &mld->ptp_data;
struct iwl_time_msmt_cfm_notify *notif = (void *)pkt->data;
struct ieee80211_tx_status status = {};
struct skb_shared_hwtstamps *shwt;
u64 ts_10ns, adj_time;
status.skb =
iwl_mld_time_sync_find_skb(mld, notif->peer_addr,
le32_to_cpu(notif->dialog_token));
if (IWL_FW_CHECK(mld, !status.skb,
"Time sync confirm but no pending skb\n"))
return;
spin_lock_bh(&data->lock);
ts_10ns = iwl_mld_get_64_bit(notif->t1_hi, notif->t1_lo);
adj_time = iwl_mld_ptp_get_adj_time(mld, ts_10ns * 10);
shwt = skb_hwtstamps(status.skb);
shwt->hwtstamp = ktime_set(0, adj_time);
ts_10ns = iwl_mld_get_64_bit(notif->t4_hi, notif->t4_lo);
adj_time = iwl_mld_ptp_get_adj_time(mld, ts_10ns * 10);
status.info = IEEE80211_SKB_CB(status.skb);
status.ack_hwtstamp = ktime_set(0, adj_time);
spin_unlock_bh(&data->lock);
IWL_DEBUG_INFO(mld,
"Time sync: TX event - report frame t1=%llu t4=%llu\n",
ktime_to_ns(shwt->hwtstamp),
ktime_to_ns(status.ack_hwtstamp));
ieee80211_tx_status_ext(mld->hw, &status);
}
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