[dpdk-dev] [RFC 11/24] vhost: extract vhost_user.c socket I/O into transport
Stefan Hajnoczi
stefanha at redhat.com
Fri Jan 19 14:44:31 CET 2018
The core vhost-user protocol code should not do socket I/O because the
details are transport-specific. Move code to send and receive
vhost-user messages into trans_af_unix.c.
Signed-off-by: Stefan Hajnoczi <stefanha at redhat.com>
---
lib/librte_vhost/vhost.h | 26 ++++++++++++
lib/librte_vhost/vhost_user.h | 6 +--
lib/librte_vhost/trans_af_unix.c | 70 +++++++++++++++++++++++++++++++--
lib/librte_vhost/vhost_user.c | 85 +++++++++++-----------------------------
4 files changed, 115 insertions(+), 72 deletions(-)
diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 757e18391..ac9ceefb9 100644
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -203,6 +203,7 @@ struct guest_page {
struct virtio_net;
struct vhost_user_socket;
+struct VhostUserMsg;
/**
* A structure containing function pointers for transport-specific operations.
@@ -264,6 +265,31 @@ struct vhost_transport_ops {
* 0 on success, -1 on failure
*/
int (*vring_call)(struct virtio_net *dev, struct vhost_virtqueue *vq);
+
+ /**
+ * Send a reply to the master.
+ *
+ * @param dev
+ * vhost device
+ * @param reply
+ * reply message
+ * @return
+ * 0 on success, -1 on failure
+ */
+ int (*send_reply)(struct virtio_net *dev, struct VhostUserMsg *reply);
+
+ /**
+ * Send a slave request to the master.
+ *
+ * @param dev
+ * vhost device
+ * @param req
+ * request message
+ * @return
+ * 0 on success, -1 on failure
+ */
+ int (*send_slave_req)(struct virtio_net *dev,
+ struct VhostUserMsg *req);
};
/** The traditional AF_UNIX vhost-user protocol transport. */
diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h
index d4bd604b9..dec658dff 100644
--- a/lib/librte_vhost/vhost_user.h
+++ b/lib/librte_vhost/vhost_user.h
@@ -110,11 +110,7 @@ typedef struct VhostUserMsg {
/* vhost_user.c */
-int vhost_user_msg_handler(int vid, int fd);
+int vhost_user_msg_handler(int vid, const struct VhostUserMsg *msg);
int vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm);
-/* socket.c */
-int read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num);
-int send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num);
-
#endif
diff --git a/lib/librte_vhost/trans_af_unix.c b/lib/librte_vhost/trans_af_unix.c
index dde3e76cd..9e5a5c127 100644
--- a/lib/librte_vhost/trans_af_unix.c
+++ b/lib/librte_vhost/trans_af_unix.c
@@ -75,7 +75,7 @@ static int vhost_user_start_client(struct vhost_user_socket *vsocket);
static void vhost_user_read_cb(int connfd, void *dat, int *remove);
/* return bytes# of read on success or negative val on failure. */
-int
+static int
read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
{
struct iovec iov;
@@ -117,8 +117,8 @@ read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
return ret;
}
-int
-send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
+static int
+send_fd_message(int sockfd, void *buf, int buflen, int *fds, int fd_num)
{
struct iovec iov;
@@ -160,6 +160,23 @@ send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
return ret;
}
+static int
+af_unix_send_reply(struct virtio_net *dev, struct VhostUserMsg *msg)
+{
+ struct vhost_user_connection *conn =
+ container_of(dev, struct vhost_user_connection, device);
+
+ return send_fd_message(conn->connfd, msg,
+ VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
+}
+
+static int
+af_unix_send_slave_req(struct virtio_net *dev, struct VhostUserMsg *msg)
+{
+ return send_fd_message(dev->slave_req_fd, msg,
+ VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
+}
+
static void
vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
{
@@ -234,6 +251,36 @@ vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
vhost_user_add_connection(fd, vsocket);
}
+/* return bytes# of read on success or negative val on failure. */
+static int
+read_vhost_message(int sockfd, struct VhostUserMsg *msg)
+{
+ int ret;
+
+ ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
+ msg->fds, VHOST_MEMORY_MAX_NREGIONS);
+ if (ret <= 0)
+ return ret;
+
+ if (msg && msg->size) {
+ if (msg->size > sizeof(msg->payload)) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "invalid msg size: %d\n", msg->size);
+ return -1;
+ }
+ ret = read(sockfd, &msg->payload, msg->size);
+ if (ret <= 0)
+ return ret;
+ if (ret != (int)msg->size) {
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "read control message failed\n");
+ return -1;
+ }
+ }
+
+ return ret;
+}
+
static void
vhost_user_read_cb(int connfd, void *dat, int *remove)
{
@@ -241,10 +288,23 @@ vhost_user_read_cb(int connfd, void *dat, int *remove)
struct vhost_user_socket *vsocket = conn->vsocket;
struct af_unix_socket *s =
container_of(vsocket, struct af_unix_socket, socket);
+ struct VhostUserMsg msg;
int ret;
- ret = vhost_user_msg_handler(conn->device.vid, connfd);
+ ret = read_vhost_message(connfd, &msg);
+ if (ret <= 0) {
+ if (ret < 0)
+ RTE_LOG(ERR, VHOST_CONFIG,
+ "vhost read message failed\n");
+ else if (ret == 0)
+ RTE_LOG(INFO, VHOST_CONFIG,
+ "vhost peer closed\n");
+ goto err;
+ }
+
+ ret = vhost_user_msg_handler(conn->device.vid, &msg);
if (ret < 0) {
+err:
close(connfd);
*remove = 1;
@@ -613,4 +673,6 @@ const struct vhost_transport_ops af_unix_trans_ops = {
.socket_cleanup = af_unix_socket_cleanup,
.socket_start = af_unix_socket_start,
.vring_call = af_unix_vring_call,
+ .send_reply = af_unix_send_reply,
+ .send_slave_req = af_unix_send_slave_req,
};
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index e54795a41..5f89453bc 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1137,48 +1137,8 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg)
return 0;
}
-/* return bytes# of read on success or negative val on failure. */
static int
-read_vhost_message(int sockfd, struct VhostUserMsg *msg)
-{
- int ret;
-
- ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
- msg->fds, VHOST_MEMORY_MAX_NREGIONS);
- if (ret <= 0)
- return ret;
-
- if (msg && msg->size) {
- if (msg->size > sizeof(msg->payload)) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "invalid msg size: %d\n", msg->size);
- return -1;
- }
- ret = read(sockfd, &msg->payload, msg->size);
- if (ret <= 0)
- return ret;
- if (ret != (int)msg->size) {
- RTE_LOG(ERR, VHOST_CONFIG,
- "read control message failed\n");
- return -1;
- }
- }
-
- return ret;
-}
-
-static int
-send_vhost_message(int sockfd, struct VhostUserMsg *msg)
-{
- if (!msg)
- return 0;
-
- return send_fd_message(sockfd, (char *)msg,
- VHOST_USER_HDR_SIZE + msg->size, NULL, 0);
-}
-
-static int
-send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
+send_vhost_reply(struct virtio_net *dev, struct VhostUserMsg *msg)
{
if (!msg)
return 0;
@@ -1188,7 +1148,16 @@ send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
msg->flags |= VHOST_USER_VERSION;
msg->flags |= VHOST_USER_REPLY_MASK;
- return send_vhost_message(sockfd, msg);
+ return dev->trans_ops->send_reply(dev, msg);
+}
+
+static int
+send_vhost_slave_req(struct virtio_net *dev, struct VhostUserMsg *msg)
+{
+ if (!msg)
+ return 0;
+
+ return dev->trans_ops->send_slave_req(dev, msg);
}
/*
@@ -1230,10 +1199,10 @@ vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, VhostUserMsg *msg)
}
int
-vhost_user_msg_handler(int vid, int fd)
+vhost_user_msg_handler(int vid, const struct VhostUserMsg *msg_)
{
+ struct VhostUserMsg msg = *msg_; /* copy so we can build the reply */
struct virtio_net *dev;
- struct VhostUserMsg msg;
int ret;
dev = get_device(vid);
@@ -1250,18 +1219,8 @@ vhost_user_msg_handler(int vid, int fd)
}
}
- ret = read_vhost_message(fd, &msg);
- if (ret <= 0 || msg.request.master >= VHOST_USER_MAX) {
- if (ret < 0)
- RTE_LOG(ERR, VHOST_CONFIG,
- "vhost read message failed\n");
- else if (ret == 0)
- RTE_LOG(INFO, VHOST_CONFIG,
- "vhost peer closed\n");
- else
- RTE_LOG(ERR, VHOST_CONFIG,
- "vhost read incorrect message\n");
-
+ if (msg.request.master >= VHOST_USER_MAX) {
+ RTE_LOG(ERR, VHOST_CONFIG, "vhost read incorrect message\n");
return -1;
}
@@ -1284,7 +1243,7 @@ vhost_user_msg_handler(int vid, int fd)
case VHOST_USER_GET_FEATURES:
msg.payload.u64 = vhost_user_get_features(dev);
msg.size = sizeof(msg.payload.u64);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
break;
case VHOST_USER_SET_FEATURES:
ret = vhost_user_set_features(dev, msg.payload.u64);
@@ -1294,7 +1253,7 @@ vhost_user_msg_handler(int vid, int fd)
case VHOST_USER_GET_PROTOCOL_FEATURES:
vhost_user_get_protocol_features(dev, &msg);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
break;
case VHOST_USER_SET_PROTOCOL_FEATURES:
vhost_user_set_protocol_features(dev, msg.payload.u64);
@@ -1316,7 +1275,7 @@ vhost_user_msg_handler(int vid, int fd)
/* it needs a reply */
msg.size = sizeof(msg.payload.u64);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
break;
case VHOST_USER_SET_LOG_FD:
close(msg.fds[0]);
@@ -1336,7 +1295,7 @@ vhost_user_msg_handler(int vid, int fd)
case VHOST_USER_GET_VRING_BASE:
vhost_user_get_vring_base(dev, &msg);
msg.size = sizeof(msg.payload.state);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
break;
case VHOST_USER_SET_VRING_KICK:
@@ -1355,7 +1314,7 @@ vhost_user_msg_handler(int vid, int fd)
case VHOST_USER_GET_QUEUE_NUM:
msg.payload.u64 = VHOST_MAX_QUEUE_PAIRS;
msg.size = sizeof(msg.payload.u64);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
break;
case VHOST_USER_SET_VRING_ENABLE:
@@ -1386,7 +1345,7 @@ vhost_user_msg_handler(int vid, int fd)
if (msg.flags & VHOST_USER_NEED_REPLY) {
msg.payload.u64 = !!ret;
msg.size = sizeof(msg.payload.u64);
- send_vhost_reply(fd, &msg);
+ send_vhost_reply(dev, &msg);
}
if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
@@ -1421,7 +1380,7 @@ vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
},
};
- ret = send_vhost_message(dev->slave_req_fd, &msg);
+ ret = send_vhost_slave_req(dev, &msg);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"Failed to send IOTLB miss message (%d)\n",
--
2.14.3
More information about the dev
mailing list