ath10k: add tracing for rx descriptor

Upon the reception of frame, the descriptor status are reported
to user space by tracepoint. This is useful for collecting rx
statistics.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/htt_rx.c

@@ -316,6 +316,7 @@ static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
 	int msdu_len, msdu_chaining = 0;
 	struct sk_buff *msdu, *next;
 	struct htt_rx_desc *rx_desc;
+	u32 tsf;
 
 	lockdep_assert_held(&htt->rx_ring.lock);
 
@@ -447,6 +448,9 @@ static int ath10k_htt_rx_amsdu_pop(struct ath10k_htt *htt,
 		last_msdu = __le32_to_cpu(rx_desc->msdu_end.info0) &
 				RX_MSDU_END_INFO0_LAST_MSDU;
 
+		tsf = __le32_to_cpu(rx_desc->ppdu_end.tsf_timestamp);
+		trace_ath10k_htt_rx_desc(ar, tsf, &rx_desc->attention,
+					 sizeof(*rx_desc) - sizeof(u32));
 		if (last_msdu) {
 			msdu->next = NULL;
 			break;

drivers/net/wireless/ath/ath10k/trace.h

@@ -281,6 +281,35 @@ TRACE_EVENT(ath10k_htt_pktlog,
 	 )
 );
 
+TRACE_EVENT(ath10k_htt_rx_desc,
+	    TP_PROTO(struct ath10k *ar, u32 tsf, void *rxdesc, u16 len),
+
+	TP_ARGS(ar, tsf, rxdesc, len),
+
+	TP_STRUCT__entry(
+		__string(device, dev_name(ar->dev))
+		__string(driver, dev_driver_string(ar->dev))
+		__field(u32, tsf)
+		__field(u16, len)
+		__dynamic_array(u8, rxdesc, len)
+	),
+
+	TP_fast_assign(
+		__assign_str(device, dev_name(ar->dev));
+		__assign_str(driver, dev_driver_string(ar->dev));
+		__entry->tsf = tsf;
+		__entry->len = len;
+		memcpy(__get_dynamic_array(rxdesc), rxdesc, len);
+	),
+
+	TP_printk(
+		"%s %s %u len %hu",
+		__get_str(driver),
+		__get_str(device),
+		__entry->tsf,
+		__entry->len
+	 )
+);
 #endif /* _TRACE_H_ || TRACE_HEADER_MULTI_READ*/
 
 /* we don't want to use include/trace/events */