libvhost-user: Adopt new backend naming

The Vhost-user specification changed feature and request
naming from _SLAVE_ to _BACKEND_.

This patch adopts the new naming convention.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20230208203259.381326-3-maxime.coquelin@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

subprojects/libvhost-user/libvhost-user.c

@@ -140,7 +140,7 @@ vu_request_to_string(unsigned int req)
         REQ(VHOST_USER_SET_VRING_ENABLE),
         REQ(VHOST_USER_SEND_RARP),
         REQ(VHOST_USER_NET_SET_MTU),
-        REQ(VHOST_USER_SET_SLAVE_REQ_FD),
+        REQ(VHOST_USER_SET_BACKEND_REQ_FD),
         REQ(VHOST_USER_IOTLB_MSG),
         REQ(VHOST_USER_SET_VRING_ENDIAN),
         REQ(VHOST_USER_GET_CONFIG),
@@ -1365,7 +1365,7 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
     int qidx = vq - dev->vq;
     int fd_num = 0;
     VhostUserMsg vmsg = {
-        .request = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
+        .request = VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG,
         .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY_MASK,
         .size = sizeof(vmsg.payload.area),
         .payload.area = {
@@ -1383,7 +1383,7 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
 
     vmsg.fd_num = fd_num;
 
-    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD)) {
         return false;
     }
 
@@ -1461,9 +1461,9 @@ vu_get_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg)
      */
     uint64_t features = 1ULL << VHOST_USER_PROTOCOL_F_MQ |
                         1ULL << VHOST_USER_PROTOCOL_F_LOG_SHMFD |
-                        1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ |
+                        1ULL << VHOST_USER_PROTOCOL_F_BACKEND_REQ |
                         1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER |
-                        1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD |
+                        1ULL << VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD |
                         1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK |
                         1ULL << VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS;
 
@@ -1494,7 +1494,7 @@ vu_set_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg)
 
     if (vu_has_protocol_feature(dev,
                                 VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS) &&
-        (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SLAVE_REQ) ||
+        (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_REQ) ||
          !vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_REPLY_ACK))) {
         /*
          * The use case for using messages for kick/call is simulation, to make
@@ -1507,7 +1507,7 @@ vu_set_protocol_features_exec(VuDev *dev, VhostUserMsg *vmsg)
          * that actually enables the simulation case.
          */
         vu_panic(dev,
-                 "F_IN_BAND_NOTIFICATIONS requires F_SLAVE_REQ && F_REPLY_ACK");
+                 "F_IN_BAND_NOTIFICATIONS requires F_BACKEND_REQ && F_REPLY_ACK");
         return false;
     }
 
@@ -1910,7 +1910,7 @@ vu_process_message(VuDev *dev, VhostUserMsg *vmsg)
         return vu_get_queue_num_exec(dev, vmsg);
     case VHOST_USER_SET_VRING_ENABLE:
         return vu_set_vring_enable_exec(dev, vmsg);
-    case VHOST_USER_SET_SLAVE_REQ_FD:
+    case VHOST_USER_SET_BACKEND_REQ_FD:
         return vu_set_slave_req_fd(dev, vmsg);
     case VHOST_USER_GET_CONFIG:
         return vu_get_config(dev, vmsg);
@@ -2416,9 +2416,9 @@ static void _vu_queue_notify(VuDev *dev, VuVirtq *vq, bool sync)
     if (vq->call_fd < 0 &&
         vu_has_protocol_feature(dev,
                                 VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS) &&
-        vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SLAVE_REQ)) {
+        vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_BACKEND_REQ)) {
         VhostUserMsg vmsg = {
-            .request = VHOST_USER_SLAVE_VRING_CALL,
+            .request = VHOST_USER_BACKEND_VRING_CALL,
             .flags = VHOST_USER_VERSION,
             .size = sizeof(vmsg.payload.state),
             .payload.state = {

subprojects/libvhost-user/libvhost-user.h

@@ -54,12 +54,12 @@ enum VhostUserProtocolFeature {
     VHOST_USER_PROTOCOL_F_RARP = 2,
     VHOST_USER_PROTOCOL_F_REPLY_ACK = 3,
     VHOST_USER_PROTOCOL_F_NET_MTU = 4,
-    VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5,
+    VHOST_USER_PROTOCOL_F_BACKEND_REQ = 5,
     VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6,
     VHOST_USER_PROTOCOL_F_CRYPTO_SESSION = 7,
     VHOST_USER_PROTOCOL_F_PAGEFAULT = 8,
     VHOST_USER_PROTOCOL_F_CONFIG = 9,
-    VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD = 10,
+    VHOST_USER_PROTOCOL_F_BACKEND_SEND_FD = 10,
     VHOST_USER_PROTOCOL_F_HOST_NOTIFIER = 11,
     VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD = 12,
     VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS = 14,
@@ -92,7 +92,7 @@ typedef enum VhostUserRequest {
     VHOST_USER_SET_VRING_ENABLE = 18,
     VHOST_USER_SEND_RARP = 19,
     VHOST_USER_NET_SET_MTU = 20,
-    VHOST_USER_SET_SLAVE_REQ_FD = 21,
+    VHOST_USER_SET_BACKEND_REQ_FD = 21,
     VHOST_USER_IOTLB_MSG = 22,
     VHOST_USER_SET_VRING_ENDIAN = 23,
     VHOST_USER_GET_CONFIG = 24,
@@ -113,13 +113,13 @@ typedef enum VhostUserRequest {
 } VhostUserRequest;
 
 typedef enum VhostUserSlaveRequest {
-    VHOST_USER_SLAVE_NONE = 0,
-    VHOST_USER_SLAVE_IOTLB_MSG = 1,
-    VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2,
-    VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG = 3,
-    VHOST_USER_SLAVE_VRING_CALL = 4,
-    VHOST_USER_SLAVE_VRING_ERR = 5,
-    VHOST_USER_SLAVE_MAX
+    VHOST_USER_BACKEND_NONE = 0,
+    VHOST_USER_BACKEND_IOTLB_MSG = 1,
+    VHOST_USER_BACKEND_CONFIG_CHANGE_MSG = 2,
+    VHOST_USER_BACKEND_VRING_HOST_NOTIFIER_MSG = 3,
+    VHOST_USER_BACKEND_VRING_CALL = 4,
+    VHOST_USER_BACKEND_VRING_ERR = 5,
+    VHOST_USER_BACKEND_MAX
 }  VhostUserSlaveRequest;
 
 typedef struct VhostUserMemoryRegion {