brcmfmac: add tracepoint for capturing the SDPCM header

Having the SDPCM header information in the traces is a valuable
piece of information.

Reviewed-by: Franky Lin <frankyl@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c

@@ -1147,6 +1147,8 @@ static int brcmf_sdio_hdparse(struct brcmf_sdio *bus, u8 *header,
 	u8 rx_seq, fc, tx_seq_max;
 	u32 swheader;
 
+	trace_brcmf_sdpcm_hdr(false, header);
+
 	/* hw header */
 	len = get_unaligned_le16(header);
 	checksum = get_unaligned_le16(header + sizeof(u16));
@@ -1269,6 +1271,7 @@ static void brcmf_sdio_hdpack(struct brcmf_sdio *bus, u8 *header,
 		     SDPCM_DOFFSET_MASK;
 	*(((__le32 *)header) + 1) = cpu_to_le32(sw_header);
 	*(((__le32 *)header) + 2) = 0;
+	trace_brcmf_sdpcm_hdr(true, header);
 }
 
 static u8 brcmf_sdbrcm_rxglom(struct brcmf_sdio *bus, u8 rxseq)

drivers/net/wireless/brcm80211/brcmfmac/tracepoint.h

@@ -110,6 +110,23 @@ TRACE_EVENT(brcmf_bdchdr,
 	TP_printk("bdc: prio=%d siglen=%d", __entry->prio, __entry->siglen)
 );
 
+TRACE_EVENT(brcmf_sdpcm_hdr,
+	TP_PROTO(bool tx, void *data),
+	TP_ARGS(tx, data),
+	TP_STRUCT__entry(
+		__field(u8, tx)
+		__field(u16, len)
+		__array(u8, hdr, 12)
+	),
+	TP_fast_assign(
+		memcpy(__entry->hdr, data, 12);
+		__entry->len = __entry->hdr[0] | (__entry->hdr[1] << 8);
+		__entry->tx = tx ? 1 : 0;
+	),
+	TP_printk("sdpcm: %s len %u, seq %d", __entry->tx ? "TX" : "RX",
+		  __entry->len, __entry->hdr[4])
+);
+
 #ifdef CONFIG_BRCM_TRACING
 
 #undef TRACE_INCLUDE_PATH