From: Harry van Haaren <harry.van.haaren@intel.com>
Date: Tue, 11 Jul 2017 14:19:31 +0000 (+0100)
Subject: event/sw: add service capability
X-Git-Tag: spdx-start~2477
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=a599eb31f2e477674fc6176cdf989ee17432b552;p=dpdk.git

event/sw: add service capability

This commit shows how easy it is to enable a specific
DPDK component with a service callback, in order to get
CPU cycles for it.

The beauty of this method is that the service is unaware
of how much CPU time it is getting - the application can
decide how to split and slice cores and map them to the
registered services.

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---

diff --git a/doc/guides/eventdevs/sw.rst b/doc/guides/eventdevs/sw.rst
index fb63c84442..a3e66243e6 100644
--- a/doc/guides/eventdevs/sw.rst
+++ b/doc/guides/eventdevs/sw.rst
@@ -32,7 +32,9 @@ Software Eventdev Poll Mode Driver
 
 The software eventdev is an implementation of the eventdev API, that provides a
 wide range of the eventdev features. The eventdev relies on a CPU core to
-perform event scheduling.
+perform event scheduling. This PMD can use the service core library to run the
+scheduling function, allowing an application to utilize the power of service
+cores to multiplex other work on the same core if required.
 
 
 Features
diff --git a/drivers/event/sw/sw_evdev.c b/drivers/event/sw/sw_evdev.c
index 5b33bfdc4e..9c534b7f93 100644
--- a/drivers/event/sw/sw_evdev.c
+++ b/drivers/event/sw/sw_evdev.c
@@ -39,6 +39,7 @@
 #include <rte_ring.h>
 #include <rte_errno.h>
 #include <rte_event_ring.h>
+#include <rte_service_component.h>
 
 #include "sw_evdev.h"
 #include "iq_ring.h"
@@ -614,6 +615,13 @@ sw_start(struct rte_eventdev *dev)
 {
 	unsigned int i, j;
 	struct sw_evdev *sw = sw_pmd_priv(dev);
+
+	/* check a service core is mapped to this service */
+	struct rte_service_spec *s = rte_service_get_by_name(sw->service_name);
+	if (!rte_service_is_running(s))
+		SW_LOG_ERR("Warning: No Service core enabled on service %s\n",
+				s->name);
+
 	/* check all ports are set up */
 	for (i = 0; i < sw->port_count; i++)
 		if (sw->ports[i].rx_worker_ring == NULL) {
@@ -716,6 +724,14 @@ set_credit_quanta(const char *key __rte_unused, const char *value, void *opaque)
 	return 0;
 }
 
+
+static int32_t sw_sched_service_func(void *args)
+{
+	struct rte_eventdev *dev = args;
+	sw_event_schedule(dev);
+	return 0;
+}
+
 static int
 sw_probe(struct rte_vdev_device *vdev)
 {
@@ -829,6 +845,22 @@ sw_probe(struct rte_vdev_device *vdev)
 	sw->credit_update_quanta = credit_quanta;
 	sw->sched_quanta = sched_quanta;
 
+	/* register service with EAL */
+	struct rte_service_spec service;
+	memset(&service, 0, sizeof(struct rte_service_spec));
+	snprintf(service.name, sizeof(service.name), "%s_service", name);
+	snprintf(sw->service_name, sizeof(sw->service_name), "%s_service",
+			name);
+	service.socket_id = socket_id;
+	service.callback = sw_sched_service_func;
+	service.callback_userdata = (void *)dev;
+
+	int32_t ret = rte_service_register(&service);
+	if (ret) {
+		SW_LOG_ERR("service register() failed");
+		return -ENOEXEC;
+	}
+
 	return 0;
 }
 
diff --git a/drivers/event/sw/sw_evdev.h b/drivers/event/sw/sw_evdev.h
index 6ef03ceb85..71de3c14a0 100644
--- a/drivers/event/sw/sw_evdev.h
+++ b/drivers/event/sw/sw_evdev.h
@@ -59,6 +59,7 @@
 
 #define EVENTDEV_NAME_SW_PMD event_sw
 #define SW_PMD_NAME RTE_STR(event_sw)
+#define SW_PMD_NAME_MAX 64
 
 #define SW_SCHED_TYPE_DIRECT (RTE_SCHED_TYPE_PARALLEL + 1)
 
@@ -276,6 +277,8 @@ struct sw_evdev {
 	/* store num stats and offset of the stats for each queue */
 	uint16_t xstats_count_per_qid[RTE_EVENT_MAX_QUEUES_PER_DEV];
 	uint16_t xstats_offset_for_qid[RTE_EVENT_MAX_QUEUES_PER_DEV];
+
+	char service_name[SW_PMD_NAME_MAX];
 };
 
 static inline struct sw_evdev *