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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (C) 2022 Intel Corporation
*/
#include "mvm.h"
#include "time-sync.h"
#include <linux/ieee80211.h>
void iwl_mvm_init_time_sync(struct iwl_time_sync_data *data)
{
skb_queue_head_init(&data->frame_list);
}
static bool iwl_mvm_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_mvm_time_sync_find_skb(struct iwl_mvm *mvm, u8 *addr,
u8 dialog_token)
{
struct sk_buff *skb;
/* The queue is expected to have only one SKB. If there are other SKBs
* in the queue, they did not get a time sync notification and are
* probably obsolete by now, so drop them.
*/
while ((skb = skb_dequeue(&mvm->time_sync.frame_list))) {
if (iwl_mvm_is_skb_match(skb, addr, dialog_token))
break;
kfree_skb(skb);
skb = NULL;
}
return skb;
}
static u64 iwl_mvm_get_64_bit(__le32 high, __le32 low)
{
return ((u64)le32_to_cpu(high) << 32) | le32_to_cpu(low);
}
void iwl_mvm_time_sync_msmt_event(struct iwl_mvm *mvm,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
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_mvm_time_sync_find_skb(mvm, notif->peer_addr,
le32_to_cpu(notif->dialog_token));
u64 adj_time;
if (!skb) {
IWL_DEBUG_INFO(mvm, "Time sync event but no pending skb\n");
return;
}
ts_10ns = iwl_mvm_get_64_bit(notif->t2_hi, notif->t2_lo);
adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
shwt = skb_hwtstamps(skb);
shwt->hwtstamp = ktime_set(0, adj_time);
ts_10ns = iwl_mvm_get_64_bit(notif->t3_hi, notif->t3_lo);
adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
rx_status = IEEE80211_SKB_RXCB(skb);
rx_status->ack_tx_hwtstamp = ktime_set(0, adj_time);
IWL_DEBUG_INFO(mvm,
"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(mvm->hw, NULL, skb, NULL);
}
void iwl_mvm_time_sync_msmt_confirm_event(struct iwl_mvm *mvm,
struct iwl_rx_cmd_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
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_mvm_time_sync_find_skb(mvm, notif->peer_addr,
le32_to_cpu(notif->dialog_token));
if (!status.skb) {
IWL_DEBUG_INFO(mvm, "Time sync confirm but no pending skb\n");
return;
}
ts_10ns = iwl_mvm_get_64_bit(notif->t1_hi, notif->t1_lo);
adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
shwt = skb_hwtstamps(status.skb);
shwt->hwtstamp = ktime_set(0, adj_time);
ts_10ns = iwl_mvm_get_64_bit(notif->t4_hi, notif->t4_lo);
adj_time = iwl_mvm_ptp_get_adj_time(mvm, ts_10ns * 10);
status.info = IEEE80211_SKB_CB(status.skb);
status.ack_hwtstamp = ktime_set(0, adj_time);
IWL_DEBUG_INFO(mvm,
"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(mvm->hw, &status);
}
int iwl_mvm_time_sync_config(struct iwl_mvm *mvm, const u8 *addr, u32 protocols)
{
struct iwl_time_sync_cfg_cmd cmd = {};
int err;
lockdep_assert_held(&mvm->mutex);
if (!fw_has_capa(&mvm->fw->ucode_capa,
IWL_UCODE_TLV_CAPA_TIME_SYNC_BOTH_FTM_TM))
return -EINVAL;
/* The fw only supports one peer. We do allow reconfiguration of the
* same peer for cases of fw reset etc.
*/
if (mvm->time_sync.active &&
!ether_addr_equal(addr, mvm->time_sync.peer_addr)) {
IWL_DEBUG_INFO(mvm, "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;
cmd.protocols = cpu_to_le32(protocols);
ether_addr_copy(cmd.peer_addr, addr);
err = iwl_mvm_send_cmd_pdu(mvm,
WIDE_ID(DATA_PATH_GROUP,
WNM_80211V_TIMING_MEASUREMENT_CONFIG_CMD),
0, sizeof(cmd), &cmd);
if (err) {
IWL_ERR(mvm, "Failed to send time sync cfg cmd: %d\n", err);
} else {
mvm->time_sync.active = protocols != 0;
ether_addr_copy(mvm->time_sync.peer_addr, addr);
IWL_DEBUG_INFO(mvm, "Time sync: set peer addr=%pM\n", addr);
}
if (!mvm->time_sync.active)
skb_queue_purge(&mvm->time_sync.frame_list);
return err;
}
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