[dpdk-dev] [PATCH v2 1/6] rte_ethdev: add function to check if device is owned

[Stephen Hemminger <stephen@networkplumber.org>]

This is a simple helper function to check if device is owned
(being used as a sub-device). It is more convienent than having
applications call rte_eth_dev_owner_get and check the result.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v2 - rename the helper function and use rte_eth_dev_owner_get

 lib/librte_ethdev/rte_ethdev.c           | 12 ++++++++++++
 lib/librte_ethdev/rte_ethdev.h           | 13 +++++++++++++
 lib/librte_ethdev/rte_ethdev_version.map |  3 +++
 3 files changed, 28 insertions(+)

diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 774c721b3484..6e2d0110f65e 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -737,6 +737,18 @@ rte_eth_dev_owner_get(const uint16_t port_id, struct rte_eth_dev_owner *owner)
 	return ret;
 }
 
+int
+rte_eth_dev_is_owned(uint16_t port_id)
+{
+	struct rte_eth_dev_owner owner;
+	int ret;
+
+	ret = rte_eth_dev_owner_get(port_id, &owner);
+	if (ret == 0)
+		ret = (owner.id != RTE_ETH_DEV_NO_OWNER);
+	return ret;
+}
+
 int
 rte_eth_dev_socket_id(uint16_t port_id)
 {
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index d1a593ad112a..3a8a4bcde4b7 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -1693,6 +1693,19 @@ __rte_experimental
 int rte_eth_dev_owner_get(const uint16_t port_id,
 		struct rte_eth_dev_owner *owner);
 
+/**
+ * Check if port_id is part of a sub-device
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device
+ * @return
+ *   - 1 if device is associated with an owner
+ *   - 0 if port is not owned
+ *   - negative errno value on error.
+ */
+__rte_experimental
+int rte_eth_dev_is_owned(uint16_t port_id);
+
 /**
  * Get the number of ports which are usable for the application.
  *
diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
index 3f32fdecf722..435df2dba149 100644
--- a/lib/librte_ethdev/rte_ethdev_version.map
+++ b/lib/librte_ethdev/rte_ethdev_version.map
@@ -230,4 +230,7 @@ EXPERIMENTAL {
 
 	# added in 20.02
 	rte_flow_dev_dump;
+
+	# added in 20.05
+	rte_eth_dev_is_owned;
 };
-- 
2.20.1