adding speed field information for interface

Get the interface speed related information using ethtool and
convert interface speed to bit rate in attoseconds per bit.

v4: adding interface bit period in iface_if_info. This bit period
    is updated during init time and whenever there are port events
    like link up and down and speed updates.

Signed-off-by: Greg Armstrong <greg.armstrong.uw@renesas.com>
Signed-off-by: Leon Goldin <leon.goldin.nx@renesas.com>
Signed-off-by: Devasish Dey <devasish.dey@syncmonk.net>
Signed-off-by: Vipin Sharma <vipin.sharma@syncmonk.net>

clock.c

@@ -1005,11 +1005,13 @@ struct clock *clock_create(enum clock_type type, struct config *config,
 		memset(ts_label, 0, sizeof(ts_label));
 		if (!rtnl_get_ts_device(interface_name(iface), ts_label))
 			interface_set_label(iface, ts_label);
+		/* Interface speed information */
+		interface_get_ifinfo(iface);
 		interface_get_tsinfo(iface);
 		if (interface_tsinfo_valid(iface) &&
-		    !interface_tsmodes_supported(iface, required_modes)) {
+				!interface_tsmodes_supported(iface, required_modes)) {
 			pr_err("interface '%s' does not support requested timestamping mode",
-			       interface_name(iface));
+					interface_name(iface));
 			return NULL;
 		}
 	}

interface.c

@@ -12,6 +12,7 @@ struct interface {
 	char name[MAX_IFNAME_SIZE + 1];
 	char ts_label[MAX_IFNAME_SIZE + 1];
 	struct sk_ts_info ts_info;
+	struct sk_if_info if_info;
 	int vclock;
 };
 
@@ -40,11 +41,22 @@ int interface_get_tsinfo(struct interface *iface)
 	return sk_get_ts_info(iface->ts_label, &iface->ts_info);
 }
 
+int interface_get_ifinfo(struct interface *iface)
+{
+	return sk_get_if_info(iface->ts_label, &iface->if_info);
+}
+
 const char *interface_label(struct interface *iface)
 {
 	return iface->ts_label;
 }
 
+bool interface_ifinfo_valid(struct interface *iface)
+{
+       return iface->if_info.valid ? true : false;
+}
+
+
 const char *interface_name(struct interface *iface)
 {
 	return iface->name;

interface.h

@@ -40,6 +40,13 @@ void interface_destroy(struct interface *iface);
  */
 int interface_get_tsinfo(struct interface *iface);
 
+/**
+ * Populate the time stamping information of a given interface.
+ * @param iface  The interface of interest.
+ * @return       zero on success, negative on failure.
+ */
+int interface_get_ifinfo(struct interface *iface);
+
 /**
  * Obtain the time stamping label of a network interface.  This can be
  * different from the name of the interface when bonding is in effect.
@@ -77,6 +84,13 @@ void interface_set_label(struct interface *iface, const char *label);
  */
 bool interface_tsinfo_valid(struct interface *iface);
 
+/**
+ * Tests whether an interface's interface information is valid or not.
+ * @param iface  The interface of interest.
+ * @return       True if the interface information is valid, false otherwise.
+ */
+bool interface_ifinfo_valid(struct interface *iface);
+
 /**
  * Tests whether an interface supports a set of given time stamping modes.
  * @param iface  The interface of interest.

port.c

@@ -2741,6 +2741,11 @@ void port_link_status(void *ctx, int linkup, int ts_index)
 		p->link_status = link_state;
 	} else {
 		p->link_status = link_state | LINK_STATE_CHANGED;
+		/* Update Interface speed information on Link up*/
+		if (linkup) {
+			interface_get_ifinfo(p->iface);
+		}
+
 		pr_notice("%s: link %s", p->log_name, linkup ? "up" : "down");
 	}
 

sk.c

@@ -267,6 +267,8 @@ int sk_get_if_info(const char *name, struct sk_if_info *if_info)
 	if_info->valid = 1;
 	if_info->speed = ecmd.req.speed;
 
+	/* Megabits per second converted to attoseconds per bit */
+	if_info->iface_bit_period = (1000000000000ULL/if_info->speed);
 	return 0;
 failed:
 #endif

sk.h

@@ -54,10 +54,12 @@ struct sk_ts_info {
  * Contains interface information returned by the GLINKSETTINGS ioctl.
  * @valid:            set to non-zero when the info struct contains valid data.
  * @speed:            interface speed.
+ * @iface_bit_period  interface bit period in attoseconds per bit.
  */
 struct sk_if_info {
 	bool valid;
 	uint32_t speed;
+	uint64_t iface_bit_period;
 };
 
 /**