From: David Marchand <david.marchand@redhat.com>
Date: Mon, 6 Jul 2020 20:52:34 +0000 (+0200)
Subject: eal: add multiprocess disable API
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=d2fd16c8b0032c70fcbeea7c25e900d64d4826b6;p=dpdk.git

eal: add multiprocess disable API

The multiprocess feature has been implicitly enabled so far.
Applications might want to explicitly disable like when using the
non-EAL threads registration API.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---

diff --git a/app/test/test_mp_secondary.c b/app/test/test_mp_secondary.c
index ac15ddbf20..3a655c3400 100644
--- a/app/test/test_mp_secondary.c
+++ b/app/test/test_mp_secondary.c
@@ -97,6 +97,13 @@ run_secondary_instances(void)
 			(1 << rte_get_master_lcore()));
 
 	ret |= launch_proc(argv1);
+	printf("### Testing rte_mp_disable() reject:\n");
+	if (rte_mp_disable()) {
+		printf("Error: rte_mp_disable() has been accepted\n");
+		ret |= -1;
+	} else {
+		printf("# Checked rte_mp_disable() is refused\n");
+	}
 	ret |= launch_proc(argv2);
 
 	ret |= !(launch_proc(argv3));
diff --git a/lib/librte_eal/common/eal_common_proc.c b/lib/librte_eal/common/eal_common_proc.c
index 7e115650ca..8ba4a29dc4 100644
--- a/lib/librte_eal/common/eal_common_proc.c
+++ b/lib/librte_eal/common/eal_common_proc.c
@@ -1236,9 +1236,9 @@ rte_mp_reply(struct rte_mp_msg *msg, const char *peer)
 
 /* Internally, the status of the mp feature is represented as a three-state:
  * - "unknown" as long as no secondary process attached to a primary process
- *   and there was no call to __rte_mp_disable yet,
+ *   and there was no call to rte_mp_disable yet,
  * - "enabled" as soon as a secondary process attaches to a primary process,
- * - "disabled" when a primary process successfully called __rte_mp_disable,
+ * - "disabled" when a primary process successfully called rte_mp_disable,
  */
 enum mp_status {
 	MP_STATUS_UNKNOWN,
@@ -1263,7 +1263,7 @@ set_mp_status(enum mp_status status)
 }
 
 bool
-__rte_mp_disable(void)
+rte_mp_disable(void)
 {
 	return set_mp_status(MP_STATUS_DISABLED);
 }
diff --git a/lib/librte_eal/common/eal_common_thread.c b/lib/librte_eal/common/eal_common_thread.c
index 04c2b37528..73a055902a 100644
--- a/lib/librte_eal/common/eal_common_thread.c
+++ b/lib/librte_eal/common/eal_common_thread.c
@@ -261,7 +261,7 @@ rte_thread_register(void)
 		rte_errno = EINVAL;
 		return -1;
 	}
-	if (!__rte_mp_disable()) {
+	if (!rte_mp_disable()) {
 		RTE_LOG(ERR, EAL, "Multiprocess in use, registering non-EAL threads is not supported.\n");
 		rte_errno = EINVAL;
 		return -1;
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 7a89f2d59b..a6a6381567 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -718,11 +718,6 @@ eal_get_internal_configuration(void);
 rte_usage_hook_t
 eal_get_application_usage_hook(void);
 
-/**
- * Mark primary process as not supporting multi-process.
- */
-bool __rte_mp_disable(void);
-
 /**
  * Instruct primary process that a secondary process wants to attach.
  */
diff --git a/lib/librte_eal/include/rte_eal.h b/lib/librte_eal/include/rte_eal.h
index 0292a2cf8f..ddcf6a2e7a 100644
--- a/lib/librte_eal/include/rte_eal.h
+++ b/lib/librte_eal/include/rte_eal.h
@@ -152,6 +152,20 @@ int rte_eal_cleanup(void);
  */
 int rte_eal_primary_proc_alive(const char *config_file_path);
 
+/**
+ * Disable multiprocess.
+ *
+ * This function can be called to indicate that multiprocess won't be used for
+ * the rest of the application life.
+ *
+ * @return
+ *   - true if called from a primary process that had no secondary processes
+ *     attached,
+ *   - false, otherwise.
+ */
+__rte_experimental
+bool rte_mp_disable(void);
+
 #define RTE_MP_MAX_FD_NUM	8    /* The max amount of fds */
 #define RTE_MP_MAX_NAME_LEN	64   /* The max length of action name */
 #define RTE_MP_MAX_PARAM_LEN	256  /* The max length of param */
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index bdbe26c401..bf0c17c233 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -400,6 +400,7 @@ EXPERIMENTAL {
 	rte_lcore_callback_unregister;
 	rte_lcore_dump;
 	rte_lcore_iterate;
+	rte_mp_disable;
 	rte_thread_register;
 	rte_thread_unregister;
 };
diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
index 099c729f37..e50601dd36 100644
--- a/lib/librte_eal/windows/eal.c
+++ b/lib/librte_eal/windows/eal.c
@@ -67,7 +67,7 @@ eal_proc_type_detect(void)
 }
 
 bool
-__rte_mp_disable(void)
+rte_mp_disable(void)
 {
 	return true;
 }