libvhost-user: introduce and use vu_has_protocol_feature()

This simplifies the various has_feature() checks, we already
have vu_has_feature() but it checks features, not protocol
features.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Message-Id: <20190904065021.1360-1-johannes@sipsolutions.net>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

contrib/libvhost-user/libvhost-user.c

@@ -94,6 +94,11 @@ bool vu_has_feature(VuDev *dev,
     return has_feature(dev->features, fbit);
 }
 
+static inline bool vu_has_protocol_feature(VuDev *dev, unsigned int fbit)
+{
+    return has_feature(dev->protocol_features, fbit);
+}
+
 static const char *
 vu_request_to_string(unsigned int req)
 {
@@ -951,8 +956,7 @@ vu_check_queue_inflights(VuDev *dev, VuVirtq *vq)
 {
     int i = 0;
 
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -1097,8 +1101,7 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
 
     vmsg.fd_num = fd_num;
 
-    if (!has_feature(dev->protocol_features,
-                     VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) {
         return false;
     }
 
@@ -2191,8 +2194,7 @@ vu_queue_map_desc(VuDev *dev, VuVirtq *vq, unsigned int idx, size_t sz)
 static int
 vu_queue_inflight_get(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -2209,8 +2211,7 @@ vu_queue_inflight_get(VuDev *dev, VuVirtq *vq, int desc_idx)
 static int
 vu_queue_inflight_pre_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }
 
@@ -2226,8 +2227,7 @@ vu_queue_inflight_pre_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 static int
 vu_queue_inflight_post_put(VuDev *dev, VuVirtq *vq, int desc_idx)
 {
-    if (!has_feature(dev->protocol_features,
-        VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
+    if (!vu_has_protocol_feature(dev, VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)) {
         return 0;
     }