wil6210: add support for link statistics

Driver can request FW to report link statistics using
WMI_LINK_STATS_CMDID.
FW will report statistics with WMI_LINK_STATS_EVENTID.
Two categories of statistics defined: basic and global.

New "link_stats" debugfs is used for requesting basic statistics
report (write) and for reading the basic statistics (read).
"link_stats_global" debugfs is used for requesting and reading the
global statistics.

Signed-off-by: Dedy Lansky <dlansky@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/wil6210/wmi.c

@@ -464,6 +464,8 @@ static const char *cmdid2name(u16 cmdid)
 		return "WMI_BCAST_DESC_RING_ADD_CMD";
 	case WMI_CFG_DEF_RX_OFFLOAD_CMDID:
 		return "WMI_CFG_DEF_RX_OFFLOAD_CMD";
+	case WMI_LINK_STATS_CMDID:
+		return "WMI_LINK_STATS_CMD";
 	default:
 		return "Untracked CMD";
 	}
@@ -598,6 +600,10 @@ static const char *eventid2name(u16 eventid)
 		return "WMI_RX_DESC_RING_CFG_DONE_EVENT";
 	case WMI_CFG_DEF_RX_OFFLOAD_DONE_EVENTID:
 		return "WMI_CFG_DEF_RX_OFFLOAD_DONE_EVENT";
+	case WMI_LINK_STATS_CONFIG_DONE_EVENTID:
+		return "WMI_LINK_STATS_CONFIG_DONE_EVENT";
+	case WMI_LINK_STATS_EVENTID:
+		return "WMI_LINK_STATS_EVENT";
 	default:
 		return "Untracked EVENT";
 	}
@@ -1329,6 +1335,130 @@ wmi_evt_sched_scan_result(struct wil6210_vif *vif, int id, void *d, int len)
 	cfg80211_sched_scan_results(wiphy, 0);
 }
 
+static void wil_link_stats_store_basic(struct wil6210_vif *vif,
+				       struct wmi_link_stats_basic *basic)
+{
+	struct wil6210_priv *wil = vif_to_wil(vif);
+	u8 cid = basic->cid;
+	struct wil_sta_info *sta;
+
+	if (cid < 0 || cid >= WIL6210_MAX_CID) {
+		wil_err(wil, "invalid cid %d\n", cid);
+		return;
+	}
+
+	sta = &wil->sta[cid];
+	sta->fw_stats_basic = *basic;
+}
+
+static void wil_link_stats_store_global(struct wil6210_vif *vif,
+					struct wmi_link_stats_global *global)
+{
+	struct wil6210_priv *wil = vif_to_wil(vif);
+
+	wil->fw_stats_global.stats = *global;
+}
+
+static void wmi_link_stats_parse(struct wil6210_vif *vif, u64 tsf,
+				 bool has_next, void *payload,
+				 size_t payload_size)
+{
+	struct wil6210_priv *wil = vif_to_wil(vif);
+	size_t hdr_size = sizeof(struct wmi_link_stats_record);
+	size_t stats_size, record_size, expected_size;
+	struct wmi_link_stats_record *hdr;
+
+	if (payload_size < hdr_size) {
+		wil_err(wil, "link stats wrong event size %zu\n", payload_size);
+		return;
+	}
+
+	while (payload_size >= hdr_size) {
+		hdr = payload;
+		stats_size = le16_to_cpu(hdr->record_size);
+		record_size = hdr_size + stats_size;
+
+		if (payload_size < record_size) {
+			wil_err(wil, "link stats payload ended unexpectedly, size %zu < %zu\n",
+				payload_size, record_size);
+			return;
+		}
+
+		switch (hdr->record_type_id) {
+		case WMI_LINK_STATS_TYPE_BASIC:
+			expected_size = sizeof(struct wmi_link_stats_basic);
+			if (stats_size < expected_size) {
+				wil_err(wil, "link stats invalid basic record size %zu < %zu\n",
+					stats_size, expected_size);
+				return;
+			}
+			if (vif->fw_stats_ready) {
+				/* clean old statistics */
+				vif->fw_stats_tsf = 0;
+				vif->fw_stats_ready = 0;
+			}
+
+			wil_link_stats_store_basic(vif, payload + hdr_size);
+
+			if (!has_next) {
+				vif->fw_stats_tsf = tsf;
+				vif->fw_stats_ready = 1;
+			}
+
+			break;
+		case WMI_LINK_STATS_TYPE_GLOBAL:
+			expected_size = sizeof(struct wmi_link_stats_global);
+			if (stats_size < sizeof(struct wmi_link_stats_global)) {
+				wil_err(wil, "link stats invalid global record size %zu < %zu\n",
+					stats_size, expected_size);
+				return;
+			}
+
+			if (wil->fw_stats_global.ready) {
+				/* clean old statistics */
+				wil->fw_stats_global.tsf = 0;
+				wil->fw_stats_global.ready = 0;
+			}
+
+			wil_link_stats_store_global(vif, payload + hdr_size);
+
+			if (!has_next) {
+				wil->fw_stats_global.tsf = tsf;
+				wil->fw_stats_global.ready = 1;
+			}
+
+			break;
+		default:
+			break;
+		}
+
+		/* skip to next record */
+		payload += record_size;
+		payload_size -= record_size;
+	}
+}
+
+static void
+wmi_evt_link_stats(struct wil6210_vif *vif, int id, void *d, int len)
+{
+	struct wil6210_priv *wil = vif_to_wil(vif);
+	struct wmi_link_stats_event *evt = d;
+	size_t payload_size;
+
+	if (len < offsetof(struct wmi_link_stats_event, payload)) {
+		wil_err(wil, "stats event way too short %d\n", len);
+		return;
+	}
+	payload_size = le16_to_cpu(evt->payload_size);
+	if (len < sizeof(struct wmi_link_stats_event) + payload_size) {
+		wil_err(wil, "stats event too short %d\n", len);
+		return;
+	}
+
+	wmi_link_stats_parse(vif, le64_to_cpu(evt->tsf), evt->has_next,
+			     evt->payload, payload_size);
+}
+
 /**
  * Some events are ignored for purpose; and need not be interpreted as
  * "unhandled events"
@@ -1359,6 +1489,7 @@ static const struct {
 	{WMI_RING_EN_EVENTID,		wmi_evt_ring_en},
 	{WMI_DATA_PORT_OPEN_EVENTID,		wmi_evt_ignore},
 	{WMI_SCHED_SCAN_RESULT_EVENTID,		wmi_evt_sched_scan_result},
+	{WMI_LINK_STATS_EVENTID,		wmi_evt_link_stats},
 };
 
 /*
@@ -3242,3 +3373,37 @@ int wil_wmi_bcast_desc_ring_add(struct wil6210_vif *vif, int ring_id)
 
 	return 0;
 }
+
+int wmi_link_stats_cfg(struct wil6210_vif *vif, u32 type, u8 cid, u32 interval)
+{
+	struct wil6210_priv *wil = vif_to_wil(vif);
+	struct wmi_link_stats_cmd cmd = {
+		.record_type_mask = cpu_to_le32(type),
+		.cid = cid,
+		.action = WMI_LINK_STATS_SNAPSHOT,
+		.interval_msec = cpu_to_le32(interval),
+	};
+	struct {
+		struct wmi_cmd_hdr wmi;
+		struct wmi_link_stats_config_done_event evt;
+	} __packed reply = {
+		.evt = {.status = WMI_FW_STATUS_FAILURE},
+	};
+	int rc;
+
+	rc = wmi_call(wil, WMI_LINK_STATS_CMDID, vif->mid, &cmd, sizeof(cmd),
+		      WMI_LINK_STATS_CONFIG_DONE_EVENTID, &reply,
+		      sizeof(reply), WIL_WMI_CALL_GENERAL_TO_MS);
+	if (rc) {
+		wil_err(wil, "WMI_LINK_STATS_CMDID failed, rc %d\n", rc);
+		return rc;
+	}
+
+	if (reply.evt.status != WMI_FW_STATUS_SUCCESS) {
+		wil_err(wil, "Link statistics config failed, status %d\n",
+			reply.evt.status);
+		return -EINVAL;
+	}
+
+	return 0;
+}