SWPTP-1066: add legacy clock adj option for test

Author: abower-amd

src/include/sfptpd_clock.h

@@ -87,6 +87,7 @@ enum sfptpd_time_source {
 enum sfptpd_clock_adj_method {
 	SFPTPD_CLOCK_PREFER_TICKADJ,
 	SFPTPD_CLOCK_PREFER_FREQADJ,
+	SFPTPD_CLOCK_LEGACY_ADJ, /* Used for testing only */
 };
 
 #define SFPTPD_CLOCK_SHORT_NAME_SIZE 16

src/sfptpd_clock.c

@@ -2005,9 +2005,11 @@ int sfptpd_clock_adjust_frequency(struct sfptpd_clock *clock, long double freq_a
 		if (system->adj_method == SFPTPD_CLOCK_PREFER_TICKADJ)
 			tick = roundl(freq_adj_ppb / system->tick_resolution_ppb);
 		else if (freq > system->max_freq_adj) /* SFPTPD_CLOCK_PREFER_FREQADJ */
-			tick = roundl((freq_adj_ppb - system->max_freq_adj) / system->tick_resolution_ppb) + 1;
+			tick = roundl((freq_adj_ppb - system->max_freq_adj) / system->tick_resolution_ppb) +
+			       (system->adj_method == SFPTPD_CLOCK_LEGACY_ADJ ? 0 : 1);
 		else if (freq < -system->max_freq_adj)
-			tick = -roundl((-freq_adj_ppb - system->max_freq_adj) / system->tick_resolution_ppb) - 1;
+			tick = -roundl((-freq_adj_ppb - system->max_freq_adj) / system->tick_resolution_ppb) -
+			       (system->adj_method == SFPTPD_CLOCK_LEGACY_ADJ ? 0 : 1);
 		else
 			tick = 0.0L;
 

src/sfptpd_general_config.c

@@ -2189,6 +2189,8 @@ static int parse_clock_adj_method(struct sfptpd_config_section *section, const c
 		general->clocks.adj_method = SFPTPD_CLOCK_PREFER_TICKADJ;
 	} else if (strcmp(params[0], "prefer-freqadj") == 0) {
 		general->clocks.adj_method = SFPTPD_CLOCK_PREFER_FREQADJ;
+	} else if (strcmp(params[0], "legacy") == 0) {
+		general->clocks.adj_method = SFPTPD_CLOCK_LEGACY_ADJ;
 	} else {
 		return EINVAL;
 	}