[PATCH 2/4] vhost: avoid function call in data path

[Jianfeng Tan <jianfeng.tan@intel.com>]

Previously, get_device() is a function call. It's OK for slow path
configuration, but takes some cycles for data path.

To avoid that, we turn this function to inline type.

Cc: maxime.coquelin@redhat.com
Cc: yliu@fridaylinux.org

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
---
 lib/librte_vhost/vhost.c | 13 -------------
 lib/librte_vhost/vhost.h | 13 ++++++++++++-
 2 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index a407067..f6f12a0 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -68,19 +68,6 @@ __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	return 0;
 }
 
-struct virtio_net *
-get_device(int vid)
-{
-	struct virtio_net *dev = vhost_devices[vid];
-
-	if (unlikely(!dev)) {
-		RTE_LOG(ERR, VHOST_CONFIG,
-			"(%d) device not found.\n", vid);
-	}
-
-	return dev;
-}
-
 void
 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
 {
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index ecd5b7b..3fce13b 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -343,7 +343,18 @@ gpa_to_hpa(struct virtio_net *dev, uint64_t gpa, uint64_t size)
 	return 0;
 }
 
-struct virtio_net *get_device(int vid);
+static __rte_always_inline struct virtio_net *
+get_device(int vid)
+{
+	struct virtio_net *dev = vhost_devices[vid];
+
+	if (unlikely(!dev)) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"(%d) device not found.\n", vid);
+	}
+
+	return dev;
+}
 
 int vhost_new_device(void);
 void cleanup_device(struct virtio_net *dev, int destroy);
-- 
2.7.4