net: Add save_acked_features callback to vhost_net

This commit introduces a save_acked_features function pointer to
vhost_net and converts the vhost_net function into a generic dispatcher.

The vhost-user backend provides the callback, making its function static.
With this change, no other module has a direct dependency on the
vhost-user implementation.

This cleanup allows for the complete removal of the net/vhost-user.h
header file.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

hw/net/vhost_net-stub.c

@@ -13,7 +13,6 @@
 #include "qemu/osdep.h"
 #include "net/net.h"
 #include "net/tap.h"
-#include "net/vhost-user.h"
 
 #include "hw/virtio/virtio-net.h"
 #include "net/vhost_net.h"

hw/net/vhost_net.c

@@ -16,7 +16,6 @@
 #include "qemu/osdep.h"
 #include "net/net.h"
 #include "net/tap.h"
-#include "net/vhost-user.h"
 #include "net/vhost-vdpa.h"
 
 #include "standard-headers/linux/vhost_types.h"
@@ -70,11 +69,11 @@ uint64_t vhost_net_get_acked_features(VHostNetState *net)
 
 void vhost_net_save_acked_features(NetClientState *nc)
 {
-#ifdef CONFIG_VHOST_NET_USER
-    if (nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
-        vhost_user_save_acked_features(nc);
+    struct vhost_net *net = get_vhost_net(nc);
+
+    if (net && net->save_acked_features) {
+        net->save_acked_features(nc);
     }
-#endif
 }
 
 static void vhost_net_disable_notifiers_nvhosts(VirtIODevice *dev,
@@ -245,6 +244,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
     net->nc = options->net_backend;
     net->dev.nvqs = options->nvqs;
     net->feature_bits = options->feature_bits;
+    net->save_acked_features = options->save_acked_features;
 
     net->dev.max_queues = 1;
     net->dev.vqs = net->vqs;

include/hw/virtio/vhost.h

@@ -1,6 +1,7 @@
 #ifndef VHOST_H
 #define VHOST_H
 
+#include "net/vhost_net.h"
 #include "hw/virtio/vhost-backend.h"
 #include "hw/virtio/virtio.h"
 #include "system/memory.h"
@@ -144,6 +145,7 @@ struct vhost_net {
     struct vhost_virtqueue vqs[2];
     int backend;
     const int *feature_bits;
+    SaveAcketFeatures *save_acked_features;
     NetClientState *nc;
 };
 

include/net/vhost-user.h

@@ -1,16 +0,0 @@
-/*
- * vhost-user.h
- *
- * Copyright (c) 2013 Virtual Open Systems Sarl.
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or later.
- * See the COPYING file in the top-level directory.
- *
- */
-
-#ifndef VHOST_USER_H
-#define VHOST_USER_H
-
-void vhost_user_save_acked_features(NetClientState *nc);
-
-#endif /* VHOST_USER_H */

include/net/vhost_net.h

@@ -8,6 +8,7 @@ struct vhost_net;
 typedef struct vhost_net VHostNetState;
 
 typedef uint64_t (GetAckedFeatures)(NetClientState *nc);
+typedef void (SaveAcketFeatures)(NetClientState *nc);
 
 typedef struct VhostNetOptions {
     VhostBackendType backend_type;
@@ -16,6 +17,7 @@ typedef struct VhostNetOptions {
     unsigned int nvqs;
     const int *feature_bits;
     GetAckedFeatures *get_acked_features;
+    SaveAcketFeatures *save_acked_features;
     void *opaque;
 } VhostNetOptions;
 

net/tap.c

@@ -745,6 +745,7 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
         options.nvqs = 2;
         options.feature_bits = kernel_feature_bits;
         options.get_acked_features = NULL;
+        options.save_acked_features = NULL;
 
         s->vhost_net = vhost_net_init(&options);
         if (!s->vhost_net) {

net/vhost-user-stub.c

@@ -11,7 +11,6 @@
 #include "qemu/osdep.h"
 #include "clients.h"
 #include "net/vhost_net.h"
-#include "net/vhost-user.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 

net/vhost-user.c

@@ -11,7 +11,6 @@
 #include "qemu/osdep.h"
 #include "clients.h"
 #include "net/vhost_net.h"
-#include "net/vhost-user.h"
 #include "hw/virtio/vhost.h"
 #include "hw/virtio/vhost-user.h"
 #include "standard-headers/linux/virtio_net.h"
@@ -88,7 +87,7 @@ static uint64_t vhost_user_get_acked_features(NetClientState *nc)
     return s->acked_features;
 }
 
-void vhost_user_save_acked_features(NetClientState *nc)
+static void vhost_user_save_acked_features(NetClientState *nc)
 {
     NetVhostUserState *s;
 
@@ -140,6 +139,7 @@ static int vhost_user_start(int queues, NetClientState *ncs[],
         options.nvqs = 2;
         options.feature_bits = user_feature_bits;
         options.get_acked_features = vhost_user_get_acked_features;
+        options.save_acked_features = vhost_user_save_acked_features;
 
         net = vhost_net_init(&options);
         if (!net) {

net/vhost-vdpa.c

@@ -203,6 +203,7 @@ static int vhost_vdpa_add(NetClientState *ncs, void *be,
     options.nvqs = nvqs;
     options.feature_bits = vdpa_feature_bits;
     options.get_acked_features = NULL;
+    options.save_acked_features = NULL;
 
     net = vhost_net_init(&options);
     if (!net) {