[PATCH v2] lib/vhost: add flag for async connection in client mode

["Ушков Даниил" <udav@mts.ru>]

This patch introduces a new flag RTE_VHOST_USER_ASYNC_CONNECT,
which in combination with the flag RTE_VHOST_USER_CLIENT makes
rte_vhost_driver_start connect asynchronously to the vhost server.

Signed-off-by: Ушков Даниил <udav@mts.ru>
---
Fixes:
1. Fix warning about the name in signature.
2. Fix warning about coding style.

P.S.
Is it ok that name is not in ascii?
Sorry, it could be hard to change it now.

 lib/vhost/rte_vhost.h |  1 +
 lib/vhost/socket.c    | 28 ++++++++++++++++------------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/lib/vhost/rte_vhost.h b/lib/vhost/rte_vhost.h
index db92f05344..b0434c4b8d 100644
--- a/lib/vhost/rte_vhost.h
+++ b/lib/vhost/rte_vhost.h
@@ -41,6 +41,7 @@ extern "C" {
 #define RTE_VHOST_USER_ASYNC_COPY	(1ULL << 7)
 #define RTE_VHOST_USER_NET_COMPLIANT_OL_FLAGS	(1ULL << 8)
 #define RTE_VHOST_USER_NET_STATS_ENABLE	(1ULL << 9)
+#define RTE_VHOST_USER_ASYNC_CONNECT	(1ULL << 10)
 
 /* Features. */
 #ifndef VIRTIO_NET_F_GUEST_ANNOUNCE
diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c
index 96b3ab5595..c681d53abb 100644
--- a/lib/vhost/socket.c
+++ b/lib/vhost/socket.c
@@ -45,6 +45,7 @@ struct vhost_user_socket {
 	bool async_copy;
 	bool net_compliant_ol_flags;
 	bool stats_enabled;
+	bool async_connect;
 
 	/*
 	 * The "supported_features" indicates the feature bits the
@@ -533,21 +534,23 @@ vhost_user_start_client(struct vhost_user_socket *vsocket)
 	const char *path = vsocket->path;
 	struct vhost_user_reconnect *reconn;
 
-	ret = vhost_user_connect_nonblock(vsocket->path, fd, (struct sockaddr *)&vsocket->un,
-					  sizeof(vsocket->un));
-	if (ret == 0) {
-		vhost_user_add_connection(fd, vsocket);
-		return 0;
-	}
+	if (!vsocket->async_connect || !vsocket->reconnect) {
+		ret = vhost_user_connect_nonblock(vsocket->path, fd,
+			(struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
+		if (ret == 0) {
+			vhost_user_add_connection(fd, vsocket);
+			return 0;
+		}
 
-	VHOST_CONFIG_LOG(path, WARNING, "failed to connect: %s", strerror(errno));
+		VHOST_CONFIG_LOG(path, WARNING, "failed to connect: %s", strerror(errno));
 
-	if (ret == -2 || !vsocket->reconnect) {
-		close(fd);
-		return -1;
-	}
+		if (ret == -2 || !vsocket->reconnect) {
+			close(fd);
+			return -1;
+		}
 
-	VHOST_CONFIG_LOG(path, INFO, "reconnecting...");
+		VHOST_CONFIG_LOG(path, INFO, "reconnecting...");
+	}
 	reconn = malloc(sizeof(*reconn));
 	if (reconn == NULL) {
 		VHOST_CONFIG_LOG(path, ERR, "failed to allocate memory for reconnect");
@@ -930,6 +933,7 @@ rte_vhost_driver_register(const char *path, uint64_t flags)
 	vsocket->async_copy = flags & RTE_VHOST_USER_ASYNC_COPY;
 	vsocket->net_compliant_ol_flags = flags & RTE_VHOST_USER_NET_COMPLIANT_OL_FLAGS;
 	vsocket->stats_enabled = flags & RTE_VHOST_USER_NET_STATS_ENABLE;
+	vsocket->async_connect = flags & RTE_VHOST_USER_ASYNC_CONNECT;
 	if (vsocket->is_vduse)
 		vsocket->iommu_support = true;
 	else
-- 
2.34.1