ptp4l: increase default tx_timestamp_retries to 100.

It seems with some cards the current default of 2 is too small, increase
the number to prevent users from having to investigate the EAGAIN error
messages.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>

default.cfg

@@ -27,7 +27,7 @@ assume_two_step		0
 logging_level		6
 path_trace_enabled	0
 follow_up_info		0
-tx_timestamp_retries	2
+tx_timestamp_retries	100
 use_syslog		1
 verbose			0
 #

gPTP.cfg

@@ -26,7 +26,7 @@ assume_two_step		1
 logging_level		6
 path_trace_enabled	1
 follow_up_info		1
-tx_timestamp_retries	2
+tx_timestamp_retries	100
 use_syslog		1
 verbose			0
 #

ptp4l.8

@@ -237,7 +237,7 @@ The default is 0 (disabled).
 .B tx_timestamp_retries
 The number of retries to fetch the tx time stamp from the kernel when a message
 is sent.
-The default is 2.
+The default is 100.
 .TP
 .B clock_servo
 The servo which is used to synchronize the local clock. Currently only one

sk.c

@@ -32,7 +32,7 @@
 
 /* globals */
 
-int sk_tx_retries = 2;
+int sk_tx_retries = 100;
 
 /* private methods */