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milan-avb: gptp: query CURRENT_DATA_SET for canonical is_grandmaster check

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This commit is contained in:
hackerman-kl 2026-04-29 07:46:36 +02:00
parent c877ea4243
commit 55bb0b6a6a
2 changed files with 64 additions and 5 deletions
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61
src/modules/module-avb/gptp.c
View file

@ -66,6 +66,10 @@ struct gptp {
uint32_t tick_count;
bool data_valid;
uint16_t steps_removed;
int64_t offset_from_master_scaled_ns;
bool data_valid_current;
};
static int make_bind_path(char *out, size_t out_size, uint64_t entity_id)
@ -368,6 +372,41 @@ static void handle_port_data_set(struct gptp *gptp,
update_avb_interface_port(gptp, pds);
}
static void handle_current_data_set(struct gptp *gptp,
const struct ptp_management_msg *res,
const uint8_t *payload, size_t payload_len)
{
const struct ptp_current_data_set *cds;
uint16_t data_len;
uint16_t steps_removed;
int64_t offset_from_master;
data_len = ntohs(res->management_message_length_be) - 2;
if (data_len != sizeof(struct ptp_current_data_set) ||
payload_len < sizeof(struct ptp_current_data_set)) {
pw_log_warn("Unexpected PTP GET CURRENT_DATA_SET response length: "
"tlv=%u payload=%zu expected=%zu",
data_len, payload_len,
sizeof(struct ptp_current_data_set));
return;
}
cds = (const struct ptp_current_data_set *)payload;
steps_removed = ntohs(cds->steps_removed_be);
offset_from_master = (int64_t)be64toh((uint64_t)cds->offset_from_master_be);
if (!gptp->data_valid_current ||
gptp->steps_removed != steps_removed) {
pw_log_info("PTP currentDS: steps_removed=%u offset_from_master=%"
PRId64 " (scaled ns)",
steps_removed, offset_from_master);
}
gptp->steps_removed = steps_removed;
gptp->offset_from_master_scaled_ns = offset_from_master;
gptp->data_valid_current = true;
}
static void on_ptp_mgmt_data(void *data, int fd, uint32_t mask)
{
struct gptp *gptp = data;
@ -457,6 +496,11 @@ static void on_ptp_mgmt_data(void *data, int fd, uint32_t mask)
buf + sizeof(struct ptp_management_msg),
(size_t)ret - sizeof(struct ptp_management_msg));
break;
case PTP_MGMT_ID_CURRENT_DATA_SET:
handle_current_data_set(gptp, &res,
buf + sizeof(struct ptp_management_msg),
(size_t)ret - sizeof(struct ptp_management_msg));
break;
default:
pw_log_debug("Unhandled PTP management ID: %04x", mgmt_id);
break;
@ -467,10 +511,11 @@ static void on_ptp_mgmt_data(void *data, int fd, uint32_t mask)
static uint16_t next_management_id(uint32_t tick_count)
{
switch (tick_count % 10) {
case 0: return PTP_MGMT_ID_DEFAULT_DATA_SET;
case 5: return PTP_MGMT_ID_PORT_DATA_SET;
default: return PTP_MGMT_ID_PARENT_DATA_SET;
switch (tick_count % 4) {
case 0: return PTP_MGMT_ID_PARENT_DATA_SET;
case 1: return PTP_MGMT_ID_CURRENT_DATA_SET;
case 2: return PTP_MGMT_ID_DEFAULT_DATA_SET;
default: return PTP_MGMT_ID_PORT_DATA_SET;
}
}
@ -587,7 +632,13 @@ bool avb_gptp_get_grandmaster_id(const struct avb_gptp *agptp, uint64_t *gm_id_b
bool avb_gptp_is_grandmaster(const struct avb_gptp *agptp)
{
const struct gptp *gptp = (const struct gptp *)agptp;
if (gptp == NULL || !gptp->data_valid) {
if (gptp == NULL) {
return false;
}
if (gptp->data_valid_current) {
return gptp->steps_removed == 0;
}
if (!gptp->data_valid) {
return false;
}
return memcmp(gptp->clock_id, gptp->gm_id, 8) == 0;

8
src/modules/module-avb/gptp.h
View file

@ -25,6 +25,7 @@ extern "C" {
#define PTP_MGMT_ACTION_RESPONSE 2
#define PTP_TLV_TYPE_MGMT 0x0001
#define PTP_MGMT_ID_DEFAULT_DATA_SET 0x2000
#define PTP_MGMT_ID_CURRENT_DATA_SET 0x2001
#define PTP_MGMT_ID_PARENT_DATA_SET 0x2002
#define PTP_MGMT_ID_PORT_DATA_SET 0x2004
@ -91,6 +92,13 @@ struct ptp_default_data_set {
uint8_t reserved2;
} __attribute__((packed));
/* IEEE 1588-2008 Section 15.5.1.2 currentDS */
struct ptp_current_data_set {
uint16_t steps_removed_be;
int64_t offset_from_master_be;
int64_t mean_path_delay_be;
} __attribute__((packed));
/* IEEE 1588-2008 Section 15.5.1.4 portDS */
struct ptp_port_data_set {
uint8_t port_clock_identity[8];