When started in automatic mode, the phc2sys program first queries the
local clock identification and then the number of ports immediately
afterwords. However, both of those values come from the default data
set. Make code both simpler and more efficient by caching the entire
data set inside of the agent.
A subsequent patch will fix the run_pmc_get_number_ports() method to
return the cached result.
The active word in the function's name is "query" rather that "get" in
order to distinguish methods that send and receive over the network
from those that merely return a cached value.
Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
phc2sys.c | 20 +++++++++++---------
pmc_agent.c | 46 +++++++++++++++++++++++-----------------------
pmc_agent.h | 15 ++++++++++++++-
3 files changed, 48 insertions(+), 33 deletions(-)
diff --git a/phc2sys.c b/phc2sys.c
index 610b8bb..5386cf4 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -843,23 +843,25 @@ static int phc2sys_recv_subscribed(void *context, struct
ptp_message *msg,
static int auto_init_ports(struct phc2sys_private *priv, int add_rt)
{
- int err, number_ports, res;
- int state, timestamping;
+ int err, number_ports, state, timestamping;
char iface[IFNAMSIZ];
struct clock *clock;
struct port *port;
unsigned int i;
while (1) {
- if (!is_running())
+ if (!is_running()) {
return -1;
- res = run_pmc_clock_identity(priv->node, 1000);
- if (res < 0)
- return -1;
- if (res > 0)
+ }
+ err = pmc_agent_query_dds(priv->node, 1000);
+ if (!err) {
break;
- /* res == 0, timeout */
- pr_notice("Waiting for ptp4l...");
+ }
+ if (err == -ETIMEDOUT) {
+ pr_notice("Waiting for ptp4l...");
+ } else {
+ return -1;
+ }
}
number_ports = run_pmc_get_number_ports(priv->node, 1000);
diff --git a/pmc_agent.c b/pmc_agent.c
index f5ce59d..4c5b18a 100644
--- a/pmc_agent.c
+++ b/pmc_agent.c
@@ -38,8 +38,8 @@ struct pmc_agent {
struct pmc *pmc;
uint64_t pmc_last_update;
- struct ClockIdentity clock_identity;
- int clock_identity_set;
+ struct defaultDS dds;
+ bool dds_valid;
int leap;
int pmc_ds_requested;
bool stay_subscribed;
@@ -63,10 +63,11 @@ static void send_subscription(struct pmc_agent *node)
static int check_clock_identity(struct pmc_agent *node, struct ptp_message
*msg)
{
- if (!node->clock_identity_set)
+ if (!node->dds_valid) {
return 1;
- return cid_eq(&node->clock_identity,
- &msg->header.sourcePortIdentity.clockIdentity);
+ }
+ return cid_eq(&node->dds.clockIdentity,
+ &msg->header.sourcePortIdentity.clockIdentity);
}
static int is_msg_mgt(struct ptp_message *msg)
@@ -251,24 +252,6 @@ void run_pmc_events(struct pmc_agent *node)
run_pmc(node, 0, -1, &msg);
}
-int run_pmc_clock_identity(struct pmc_agent *node, int timeout)
-{
- struct ptp_message *msg;
- struct defaultDS *dds;
- int res;
-
- res = run_pmc(node, timeout, TLV_DEFAULT_DATA_SET, &msg);
- if (res <= 0)
- return res;
-
- dds = (struct defaultDS *) management_tlv_data(msg);
- memcpy(&node->clock_identity, &dds->clockIdentity,
- sizeof(struct ClockIdentity));
- node->clock_identity_set = 1;
- msg_put(msg);
- return 1;
-}
-
int init_pmc_node(struct config *cfg, struct pmc_agent *node, const char *uds,
pmc_node_recv_subscribed_t *recv_subscribed, void *context)
{
@@ -309,6 +292,23 @@ int pmc_agent_get_sync_offset(struct pmc_agent *agent)
return agent->sync_offset;
}
+int pmc_agent_query_dds(struct pmc_agent *node, int timeout)
+{
+ struct ptp_message *msg;
+ struct defaultDS *dds;
+ int res;
+
+ res = run_pmc(node, timeout, TLV_DEFAULT_DATA_SET, &msg);
+ if (is_run_pmc_error(res)) {
+ return run_pmc_err2errno(res);
+ }
+ dds = (struct defaultDS *) management_tlv_data(msg);
+ memcpy(&node->dds, dds, sizeof(node->dds));
+ node->dds_valid = true;
+ msg_put(msg);
+ return 0;
+}
+
int pmc_agent_query_port_properties(struct pmc_agent *node, int timeout,
unsigned int port, int *state,
int *tstamping, char *iface)
diff --git a/pmc_agent.h b/pmc_agent.h
index 7fd37eb..2bb3101 100644
--- a/pmc_agent.h
+++ b/pmc_agent.h
@@ -33,7 +33,6 @@ typedef int pmc_node_recv_subscribed_t(void *context, struct
ptp_message *msg,
int init_pmc_node(struct config *cfg, struct pmc_agent *agent, const char *uds,
pmc_node_recv_subscribed_t *recv_subscribed, void *context);
-int run_pmc_clock_identity(struct pmc_agent *agent, int timeout);
int run_pmc_wait_sync(struct pmc_agent *agent, int timeout);
int run_pmc_get_number_ports(struct pmc_agent *agent, int timeout);
void run_pmc_events(struct pmc_agent *agent);
@@ -64,6 +63,20 @@ int pmc_agent_get_leap(struct pmc_agent *agent);
*/
int pmc_agent_get_sync_offset(struct pmc_agent *agent);
+/**
+ * Queries the local clock's default data set from the ptp4l service.
+ * The result of the query will be cached inside of the agent.
+ *
+ * In addition:
+ *
+ * - The port state notification callback might be invoked.
+ *
+ * @param agent Pointer to a PMC instance obtained via @ref
pmc_agent_create().
+ * @param timeout Transmit and receive timeout in milliseconds.
+ * @return Zero on success, negative error code otherwise.
+ */
+int pmc_agent_query_dds(struct pmc_agent *agent, int timeout);
+
/**
* Queries the port properties of a given port from the ptp4l service.
*
--
2.20.1
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