selftests/net: timestamping: add ptp v2 support

The timestamping tool is supporting now only PTPv1 (IEEE-1588 2002) while
modern HW often supports also/only PTPv2.

Hence timestamping tool is still useful for sanity testing of PTP drivers
HW timestamping capabilities it's reasonable to upstate it to support
PTPv2. This patch adds corresponding support which can be enabled by using
new parameter "PTPV2".

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/20201029190931.30883-1-grygorii.strashko@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/timestamping.c

@@ -59,7 +59,8 @@ static void usage(const char *error)
 	       "  SOF_TIMESTAMPING_SOFTWARE - request reporting of software time stamps\n"
 	       "  SOF_TIMESTAMPING_RAW_HARDWARE - request reporting of raw HW time stamps\n"
 	       "  SIOCGSTAMP - check last socket time stamp\n"
-	       "  SIOCGSTAMPNS - more accurate socket time stamp\n");
+	       "  SIOCGSTAMPNS - more accurate socket time stamp\n"
+	       "  PTPV2 - use PTPv2 messages\n");
 	exit(1);
 }
 
@@ -115,13 +116,28 @@ static const unsigned char sync[] = {
 	0x00, 0x00, 0x00, 0x00
 };
 
-static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len)
+static const unsigned char sync_v2[] = {
+	0x00, 0x02, 0x00, 0x2C,
+	0x00, 0x00, 0x02, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0xFF,
+	0xFE, 0x00, 0x00, 0x00,
+	0x00, 0x01, 0x00, 0x01,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00,
+};
+
+static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len, int ptpv2)
 {
+	size_t sync_len = ptpv2 ? sizeof(sync_v2) : sizeof(sync);
+	const void *sync_p = ptpv2 ? sync_v2 : sync;
 	struct timeval now;
 	int res;
 
-	res = sendto(sock, sync, sizeof(sync), 0,
-		addr, addr_len);
+	res = sendto(sock, sync_p, sync_len, 0, addr, addr_len);
 	gettimeofday(&now, 0);
 	if (res < 0)
 		printf("%s: %s\n", "send", strerror(errno));
@@ -134,9 +150,11 @@ static void sendpacket(int sock, struct sockaddr *addr, socklen_t addr_len)
 static void printpacket(struct msghdr *msg, int res,
 			char *data,
 			int sock, int recvmsg_flags,
-			int siocgstamp, int siocgstampns)
+			int siocgstamp, int siocgstampns, int ptpv2)
 {
 	struct sockaddr_in *from_addr = (struct sockaddr_in *)msg->msg_name;
+	size_t sync_len = ptpv2 ? sizeof(sync_v2) : sizeof(sync);
+	const void *sync_p = ptpv2 ? sync_v2 : sync;
 	struct cmsghdr *cmsg;
 	struct timeval tv;
 	struct timespec ts;
@@ -210,10 +228,9 @@ static void printpacket(struct msghdr *msg, int res,
 					"probably SO_EE_ORIGIN_TIMESTAMPING"
 #endif
 					);
-				if (res < sizeof(sync))
+				if (res < sync_len)
 					printf(" => truncated data?!");
-				else if (!memcmp(sync, data + res - sizeof(sync),
-							sizeof(sync)))
+				else if (!memcmp(sync_p, data + res - sync_len, sync_len))
 					printf(" => GOT OUR DATA BACK (HURRAY!)");
 				break;
 			}
@@ -257,7 +274,7 @@ static void printpacket(struct msghdr *msg, int res,
 }
 
 static void recvpacket(int sock, int recvmsg_flags,
-		       int siocgstamp, int siocgstampns)
+		       int siocgstamp, int siocgstampns, int ptpv2)
 {
 	char data[256];
 	struct msghdr msg;
@@ -288,7 +305,7 @@ static void recvpacket(int sock, int recvmsg_flags,
 	} else {
 		printpacket(&msg, res, data,
 			    sock, recvmsg_flags,
-			    siocgstamp, siocgstampns);
+			    siocgstamp, siocgstampns, ptpv2);
 	}
 }
 
@@ -300,6 +317,7 @@ int main(int argc, char **argv)
 	int siocgstamp = 0;
 	int siocgstampns = 0;
 	int ip_multicast_loop = 0;
+	int ptpv2 = 0;
 	char *interface;
 	int i;
 	int enabled = 1;
@@ -335,6 +353,8 @@ int main(int argc, char **argv)
 			siocgstampns = 1;
 		else if (!strcasecmp(argv[i], "IP_MULTICAST_LOOP"))
 			ip_multicast_loop = 1;
+		else if (!strcasecmp(argv[i], "PTPV2"))
+			ptpv2 = 1;
 		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_HARDWARE"))
 			so_timestamping_flags |= SOF_TIMESTAMPING_TX_HARDWARE;
 		else if (!strcasecmp(argv[i], "SOF_TIMESTAMPING_TX_SOFTWARE"))
@@ -369,6 +389,7 @@ int main(int argc, char **argv)
 		HWTSTAMP_TX_ON : HWTSTAMP_TX_OFF;
 	hwconfig.rx_filter =
 		(so_timestamping_flags & SOF_TIMESTAMPING_RX_HARDWARE) ?
+		ptpv2 ? HWTSTAMP_FILTER_PTP_V2_L4_SYNC :
 		HWTSTAMP_FILTER_PTP_V1_L4_SYNC : HWTSTAMP_FILTER_NONE;
 	hwconfig_requested = hwconfig;
 	if (ioctl(sock, SIOCSHWTSTAMP, &hwtstamp) < 0) {
@@ -496,16 +517,16 @@ int main(int argc, char **argv)
 					printf("has error\n");
 				recvpacket(sock, 0,
 					   siocgstamp,
-					   siocgstampns);
+					   siocgstampns, ptpv2);
 				recvpacket(sock, MSG_ERRQUEUE,
 					   siocgstamp,
-					   siocgstampns);
+					   siocgstampns, ptpv2);
 			}
 		} else {
 			/* write one packet */
 			sendpacket(sock,
 				   (struct sockaddr *)&addr,
-				   sizeof(addr));
+				   sizeof(addr), ptpv2);
 			next.tv_sec += 5;
 			continue;
 		}