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path: root/drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c
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Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c')
-rw-r--r--drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c173
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c b/drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c
new file mode 100644
index 000000000000..edae3e24192b
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/time-sync.c
@@ -0,0 +1,173 @@
+// 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;
+}