commit 399907db7f9dc3f57c3f9831b3b4da705a2c51a3
Author: Erez Geva <erezgeva2@gmail.com>
Date:   Tue Aug 28 22:05:28 2018 +0200

    config: Add hardware time stamp filter setting mode
    
    Add global option for the hardware time stamp setting.
    The function could:
    Normally set the filters as the PTP daemon require.
    Check that the filters are proper but do not change them.
    Full, set the RX filter to all and the TX filter as the PTP daemon require.
    
    [ RC: added missing extern keyword and fixed indentation. ]
    
    Signed-off-by: Erez Geva <erez.geva.ext@siemens.com>
    Signed-off-by: Erez Geva <ErezGeva2@gmail.com>

diff --git a/config.c b/config.c
index 7914ba4..3530ce6 100644
--- a/config.c
+++ b/config.c
@@ -164,6 +164,13 @@ static struct config_enum delay_mech_enu[] = {
 	{ NULL, 0 },
 };
 
+static struct config_enum hwts_filter_enu[] = {
+	{ "normal",  HWTS_FILTER_NORMAL  },
+	{ "check",   HWTS_FILTER_CHECK   },
+	{ "full",    HWTS_FILTER_FULL    },
+	{ NULL, 0 },
+};
+
 static struct config_enum nw_trans_enu[] = {
 	{ "L2",    TRANS_IEEE_802_3 },
 	{ "UDPv4", TRANS_UDP_IPV4   },
@@ -215,6 +222,7 @@ struct config_item config_tab[] = {
 	GLOB_ITEM_INT("G.8275.defaultDS.localPriority", 128, 1, UINT8_MAX),
 	PORT_ITEM_INT("G.8275.portDS.localPriority", 128, 1, UINT8_MAX),
 	GLOB_ITEM_INT("gmCapable", 1, 0, 1),
+	GLOB_ITEM_ENU("hwts_filter", HWTS_FILTER_NORMAL, hwts_filter_enu),
 	PORT_ITEM_INT("hybrid_e2e", 0, 0, 1),
 	PORT_ITEM_INT("ignore_transport_specific", 0, 0, 1),
 	PORT_ITEM_INT("ingressLatency", 0, INT_MIN, INT_MAX),
diff --git a/ptp4l.8 b/ptp4l.8
index 10c5c2f..39bf36e 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -661,6 +661,15 @@ The time source is a single byte code that gives an idea of the kind
 of local clock in use. The value is purely informational, having no
 effect on the outcome of the Best Master Clock algorithm, and is
 advertised when the clock becomes grand master.
+.TP
+.B hwts_filter
+Select the hardware time stamp filter setting mode.
+Possible values are normal, check, full.
+Normal mode set the filters as needed.
+Check mode only check but do not set.
+Full mode set the receive filter to mark all packets with hardware time stamp,
+ so all applications can get them.
+The default is normal.
 
 .SH UNICAST DISCOVERY OPTIONS
 
diff --git a/ptp4l.c b/ptp4l.c
index 9ef8169..3a9f084 100644
--- a/ptp4l.c
+++ b/ptp4l.c
@@ -191,6 +191,7 @@ int main(int argc, char *argv[])
 	assume_two_step = config_get_int(cfg, NULL, "assume_two_step");
 	sk_check_fupsync = config_get_int(cfg, NULL, "check_fup_sync");
 	sk_tx_timeout = config_get_int(cfg, NULL, "tx_timestamp_timeout");
+	sk_hwts_filter_mode = config_get_int(cfg, NULL, "hwts_filter");
 
 	if (config_get_int(cfg, NULL, "clock_servo") == CLOCK_SERVO_NTPSHM) {
 		config_set_int(cfg, "kernel_leap", 0);
diff --git a/sk.c b/sk.c
index f18b2bf..43f1800 100644
--- a/sk.c
+++ b/sk.c
@@ -40,39 +40,76 @@
 
 int sk_tx_timeout = 1;
 int sk_check_fupsync;
+enum hwts_filter_mode sk_hwts_filter_mode = HWTS_FILTER_NORMAL;
 
 /* private methods */
 
-static int hwts_init(int fd, const char *device, int rx_filter, int tx_type)
+static void init_ifreq(struct ifreq *ifreq, struct hwtstamp_config *cfg,
+	const char *device)
 {
-	struct ifreq ifreq;
-	struct hwtstamp_config cfg, req;
-	int err;
+	memset(ifreq, 0, sizeof(*ifreq));
+	memset(cfg, 0, sizeof(*cfg));
 
-	memset(&ifreq, 0, sizeof(ifreq));
-	memset(&cfg, 0, sizeof(cfg));
+	strncpy(ifreq->ifr_name, device, sizeof(ifreq->ifr_name) - 1);
 
-	strncpy(ifreq.ifr_name, device, sizeof(ifreq.ifr_name) - 1);
+	ifreq->ifr_data = (void *) cfg;
+}
 
-	ifreq.ifr_data = (void *) &cfg;
-	cfg.tx_type    = tx_type;
-	cfg.rx_filter  = rx_filter;
-	req = cfg;
-	err = ioctl(fd, SIOCSHWTSTAMP, &ifreq);
-	if (err < 0)
-		return err;
+static int hwts_init(int fd, const char *device, int rx_filter,
+	int rx_filter2, int tx_type)
+{
+	struct ifreq ifreq;
+	struct hwtstamp_config cfg;
+	int err;
 
-	if (memcmp(&cfg, &req, sizeof(cfg))) {
+	init_ifreq(&ifreq, &cfg, device);
 
-		pr_debug("driver changed our HWTSTAMP options");
-		pr_debug("tx_type   %d not %d", cfg.tx_type, req.tx_type);
-		pr_debug("rx_filter %d not %d", cfg.rx_filter, req.rx_filter);
+	switch (sk_hwts_filter_mode) {
+	case HWTS_FILTER_CHECK:
+		err = ioctl(fd, SIOCGHWTSTAMP, &ifreq);
+		if (err < 0) {
+			pr_err("ioctl SIOCGHWTSTAMP failed: %m");
+			return err;
+		}
+		break;
+	case HWTS_FILTER_FULL:
+		cfg.tx_type   = tx_type;
+		cfg.rx_filter = HWTSTAMP_FILTER_ALL;
+		err = ioctl(fd, SIOCSHWTSTAMP, &ifreq);
+		if (err < 0) {
+			pr_err("ioctl SIOCSHWTSTAMP failed: %m");
+			return err;
+		}
+		break;
+	case HWTS_FILTER_NORMAL:
+		cfg.tx_type   = tx_type;
+		cfg.rx_filter = rx_filter;
+		err = ioctl(fd, SIOCSHWTSTAMP, &ifreq);
+		if (err < 0) {
+			pr_info("driver rejected most general HWTSTAMP filter");
 
-		if (cfg.tx_type != req.tx_type ||
-		    (cfg.rx_filter != HWTSTAMP_FILTER_ALL &&
-		     cfg.rx_filter != HWTSTAMP_FILTER_PTP_V2_EVENT)) {
-			return -1;
+			init_ifreq(&ifreq, &cfg, device);
+			cfg.tx_type   = tx_type;
+			cfg.rx_filter = rx_filter2;
+
+			err = ioctl(fd, SIOCSHWTSTAMP, &ifreq);
+			if (err < 0) {
+				pr_err("ioctl SIOCSHWTSTAMP failed: %m");
+				return err;
+			}
 		}
+		break;
+	}
+
+	if (cfg.tx_type != tx_type ||
+	    (cfg.rx_filter != rx_filter &&
+	     cfg.rx_filter != rx_filter2 &&
+	     cfg.rx_filter != HWTSTAMP_FILTER_ALL)) {
+		pr_debug("tx_type   %d not %d", cfg.tx_type, tx_type);
+		pr_debug("rx_filter %d not %d or %d", cfg.rx_filter, rx_filter,
+			 rx_filter2);
+		pr_err("The current filter does not match the required");
+		return -1;
 	}
 
 	return 0;
@@ -450,15 +487,9 @@ int sk_timestamping_init(int fd, const char *device, enum timestamp_type type,
 		case TRANS_UDS:
 			return -1;
 		}
-		err = hwts_init(fd, device, filter1, tx_type);
-		if (err) {
-			pr_info("driver rejected most general HWTSTAMP filter");
-			err = hwts_init(fd, device, filter2, tx_type);
-			if (err) {
-				pr_err("ioctl SIOCSHWTSTAMP failed: %m");
-				return err;
-			}
-		}
+		err = hwts_init(fd, device, filter1, filter2, tx_type);
+		if (err)
+			return err;
 	}
 
 	if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMPING,
diff --git a/sk.h b/sk.h
index d91d5d8..fd4d820 100644
--- a/sk.h
+++ b/sk.h
@@ -23,6 +23,16 @@
 #include "address.h"
 #include "transport.h"
 
+/**
+ * Defines the available Hardware time-stamp setting modes.
+ */
+
+enum hwts_filter_mode {
+	HWTS_FILTER_NORMAL,    /* set hardware filters in normal way */
+	HWTS_FILTER_CHECK,     /* check filters but do not change them */
+	HWTS_FILTER_FULL,      /* Use time-stamp on all received packets */
+};
+
 /**
  * Contains timestamping information returned by the GET_TS_INFO ioctl.
  * @valid:            set to non-zero when the info struct contains valid data.
@@ -131,4 +141,9 @@ extern int sk_tx_timeout;
  */
 extern int sk_check_fupsync;
 
+/**
+ * Hardware time-stamp setting mode
+ */
+extern enum hwts_filter_mode sk_hwts_filter_mode;
+
 #endif