eventdev: add API to get service id

In case of sw event device the scheduling can be done on a service core
using the service registered at the time of probe.
This patch adds a helper function to get the service id that can be used
by the application to assign a lcore for the service to run on.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

diff --git a/lib/librte_eventdev/rte_eventdev.c b/lib/librte_eventdev/rte_eventdev.c
index 250bfc8..ce6a5dc 100644 (file)
--- a/lib/librte_eventdev/rte_eventdev.c
+++ b/lib/librte_eventdev/rte_eventdev.c
@@ -962,6 +962,23 @@ rte_event_dequeue_timeout_ticks(uint8_t dev_id, uint64_t ns,
        return (*dev->dev_ops->timeout_ticks)(dev, ns, timeout_ticks);
 }
 
+int
+rte_event_dev_service_id_get(uint8_t dev_id, uint32_t *service_id)
+{
+       struct rte_eventdev *dev;
+
+       RTE_EVENTDEV_VALID_DEVID_OR_ERR_RET(dev_id, -EINVAL);
+       dev = &rte_eventdevs[dev_id];
+
+       if (service_id == NULL)
+               return -EINVAL;
+
+       if (dev->data->service_inited)
+               *service_id = dev->data->service_id;
+
+       return dev->data->service_inited ? 0 : -ESRCH;
+}
+
 int
 rte_event_dev_dump(uint8_t dev_id, FILE *f)
 {

diff --git a/lib/librte_eventdev/rte_eventdev.h b/lib/librte_eventdev/rte_eventdev.h
index b9d1b98..a7973a9 100644 (file)
--- a/lib/librte_eventdev/rte_eventdev.h
+++ b/lib/librte_eventdev/rte_eventdev.h
@@ -1103,6 +1103,10 @@ struct rte_eventdev_data {
        /**< Event device capabilities(RTE_EVENT_DEV_CAP_)*/
        struct rte_event_dev_config dev_conf;
        /**< Configuration applied to device. */
+       uint8_t service_inited;
+       /* Service initialization state */
+       uint32_t service_id;
+       /* Service ID*/
 
        RTE_STD_C11
        uint8_t dev_started : 1;
@@ -1605,6 +1609,24 @@ int
 rte_event_port_links_get(uint8_t dev_id, uint8_t port_id,
                         uint8_t queues[], uint8_t priorities[]);
 
+/**
+ * Retrieve the service ID of the event dev. If the adapter doesn't use
+ * a rte_service function, this function returns -ESRCH.
+ *
+ * @param dev_id
+ *   The identifier of the device.
+ *
+ * @param [out] service_id
+ *   A pointer to a uint32_t, to be filled in with the service id.
+ *
+ * @return
+ *   - 0: Success
+ *   - <0: Error code on failure, if the event dev doesn't use a rte_service
+ *   function, this function returns -ESRCH.
+ */
+int
+rte_event_dev_service_id_get(uint8_t dev_id, uint32_t *service_id);
+
 /**
  * Dump internal information about *dev_id* to the FILE* provided in *f*.
  *

diff --git a/lib/librte_eventdev/rte_eventdev_version.map b/lib/librte_eventdev/rte_eventdev_version.map
index 800ca6e..108ae61 100644 (file)
--- a/lib/librte_eventdev/rte_eventdev_version.map
+++ b/lib/librte_eventdev/rte_eventdev_version.map
@@ -51,6 +51,7 @@ DPDK_17.11 {
        global:
 
        rte_event_dev_attr_get;
+       rte_event_dev_service_id_get;
        rte_event_port_attr_get;
        rte_event_queue_attr_get;