[Qemu-devel] [RFC] net: 'Remove vhostforce option in addition to vhost param'

[Pankaj Gupta <pagupta@redhat.com>]

 vhostforce was added to enable use of vhost when
 guest don't have MSI-X support.
 Now, we have scenarios which  dont use interrupts
 like DPDK and still use vhost. Also, performance of
 guests without MSI-X support is getting less popular.

 Its ok to remove this extra option and enable vhost
 on the basis of vhost=ON/OFF.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
---
 net/tap.c        |  4 +---
 net/vhost-user.c | 16 ++--------------
 2 files changed, 3 insertions(+), 17 deletions(-)

diff --git a/net/tap.c b/net/tap.c
index 1fe0edf..bd2efa9 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -634,13 +634,11 @@ static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
         }
     }
 
-    if (tap->has_vhost ? tap->vhost :
-        vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
+    if (tap->has_vhost ? tap->vhost : vhostfdname) {
         VhostNetOptions options;
 
         options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
         options.net_backend = &s->nc;
-        options.force = tap->has_vhostforce && tap->vhostforce;
 
         if (tap->has_vhostfd || tap->has_vhostfds) {
             vhostfd = monitor_handle_fd_param(cur_mon, vhostfdname);
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 24e050c..d2d7bf2 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -18,7 +18,6 @@
 typedef struct VhostUserState {
     NetClientState nc;
     CharDriverState *chr;
-    bool vhostforce;
     VHostNetState *vhost_net;
 } VhostUserState;
 
@@ -51,7 +50,6 @@ static int vhost_user_start(VhostUserState *s)
     options.backend_type = VHOST_BACKEND_TYPE_USER;
     options.net_backend = &s->nc;
     options.opaque = s->chr;
-    options.force = s->vhostforce;
 
     s->vhost_net = vhost_net_init(&options);
 
@@ -133,8 +131,7 @@ static void net_vhost_user_event(void *opaque, int event)
 }
 
 static int net_vhost_user_init(NetClientState *peer, const char *device,
-                               const char *name, CharDriverState *chr,
-                               bool vhostforce)
+                               const char *name, CharDriverState *chr)
 {
     NetClientState *nc;
     VhostUserState *s;
@@ -149,7 +146,6 @@ static int net_vhost_user_init(NetClientState *peer, const char *device,
     /* We don't provide a receive callback */
     s->nc.receive_disabled = 1;
     s->chr = chr;
-    s->vhostforce = vhostforce;
 
     qemu_chr_add_handlers(s->chr, NULL, NULL, net_vhost_user_event, s);
 
@@ -230,7 +226,6 @@ int net_init_vhost_user(const NetClientOptions *opts, const char *name,
 {
     const NetdevVhostUserOptions *vhost_user_opts;
     CharDriverState *chr;
-    bool vhostforce;
 
     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
     vhost_user_opts = opts->vhost_user;
@@ -247,12 +242,5 @@ int net_init_vhost_user(const NetClientOptions *opts, const char *name,
         return -1;
     }
 
-    /* vhostforce for non-MSIX */
-    if (vhost_user_opts->has_vhostforce) {
-        vhostforce = vhost_user_opts->vhostforce;
-    } else {
-        vhostforce = false;
-    }
-
-    return net_vhost_user_init(peer, "vhost_user", name, chr, vhostforce);
+    return net_vhost_user_init(peer, "vhost_user", name, chr);
 }
-- 
1.8.3.1