[dpdk-dev] [PATCH v5 3/4] vhost: using EVENTFD_COPY2

[Pavel Boldin]

Signed-off-by: Pavel Boldin <pboldin at mirantis.com>
---
 lib/librte_vhost/vhost_cuse/eventfd_copy.c   | 54 ++++++++++++++++++----------
 lib/librte_vhost/vhost_cuse/eventfd_copy.h   |  6 ++++
 lib/librte_vhost/vhost_cuse/vhost-net-cdev.c |  3 ++
 3 files changed, 44 insertions(+), 19 deletions(-)

diff --git a/lib/librte_vhost/vhost_cuse/eventfd_copy.c b/lib/librte_vhost/vhost_cuse/eventfd_copy.c
index 4d697a2..1625163 100644
--- a/lib/librte_vhost/vhost_cuse/eventfd_copy.c
+++ b/lib/librte_vhost/vhost_cuse/eventfd_copy.c
@@ -46,6 +46,32 @@
 
 static const char eventfd_cdev[] = "/dev/eventfd-link";
 
+static int eventfd_link = -1;
+
+int
+eventfd_init(void)
+{
+	if (eventfd_link > 0)
+		return 0;
+
+	eventfd_link = open(eventfd_cdev, O_RDWR);
+	if (eventfd_link < 0) {
+		RTE_LOG(ERR, VHOST_CONFIG,
+			"eventfd_link module is not loaded\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int
+eventfd_free(void)
+{
+	if (eventfd_link > 0)
+		close(eventfd_link);
+	return 0;
+}
+
 /*
  * This function uses the eventfd_link kernel module to copy an eventfd file
  * descriptor provided by QEMU in to our process space.
@@ -53,36 +79,26 @@ static const char eventfd_cdev[] = "/dev/eventfd-link";
 int
 eventfd_copy(int target_fd, int target_pid)
 {
-	int eventfd_link, ret;
-	struct eventfd_copy eventfd_copy;
-	int fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+	int ret;
+	struct eventfd_copy2 eventfd_copy2;
 
-	if (fd == -1)
-		return -1;
 
 	/* Open the character device to the kernel module. */
 	/* TODO: check this earlier rather than fail until VM boots! */
-	eventfd_link = open(eventfd_cdev, O_RDWR);
-	if (eventfd_link < 0) {
-		RTE_LOG(ERR, VHOST_CONFIG,
-			"eventfd_link module is not loaded\n");
-		close(fd);
+	if (eventfd_init() < 0)
 		return -1;
-	}
 
-	eventfd_copy.source_fd = fd;
-	eventfd_copy.target_fd = target_fd;
-	eventfd_copy.target_pid = target_pid;
+	eventfd_copy2.fd = target_fd;
+	eventfd_copy2.pid = target_pid;
+	eventfd_copy2.flags = O_NONBLOCK | O_CLOEXEC;
 	/* Call the IOCTL to copy the eventfd. */
-	ret = ioctl(eventfd_link, EVENTFD_COPY, &eventfd_copy);
-	close(eventfd_link);
+	ret = ioctl(eventfd_link, EVENTFD_COPY2, &eventfd_copy2);
 
 	if (ret < 0) {
 		RTE_LOG(ERR, VHOST_CONFIG,
-			"EVENTFD_COPY ioctl failed\n");
-		close(fd);
+			"EVENTFD_COPY2 ioctl failed\n");
 		return -1;
 	}
 
-	return fd;
+	return ret;
 }
diff --git a/lib/librte_vhost/vhost_cuse/eventfd_copy.h b/lib/librte_vhost/vhost_cuse/eventfd_copy.h
index 19ae30d..5f446ca 100644
--- a/lib/librte_vhost/vhost_cuse/eventfd_copy.h
+++ b/lib/librte_vhost/vhost_cuse/eventfd_copy.h
@@ -34,6 +34,12 @@
 #define _EVENTFD_H
 
 int
+eventfd_init(void);
+
+int
+eventfd_free(void);
+
+int
 eventfd_copy(int target_fd, int target_pid);
 
 #endif
diff --git a/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c b/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
index 1ae7c49..ae7ad8d 100644
--- a/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
+++ b/lib/librte_vhost/vhost_cuse/vhost-net-cdev.c
@@ -373,6 +373,9 @@ rte_vhost_driver_register(const char *dev_name)
 		return -1;
 	}
 
+	if (eventfd_init() < 0)
+		return -1;
+
 	/*
 	 * The device name is created. This is passed to QEMU so that it can
 	 * register the device with our application.
-- 
1.9.1