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Re: [Qemu-devel] [PATCH v2 2/2] build-sys: do not compile net/vhost-user
From: |
Marc-André Lureau |
Subject: |
Re: [Qemu-devel] [PATCH v2 2/2] build-sys: do not compile net/vhost-user.c if vhost-user is disabled |
Date: |
Tue, 1 Aug 2017 12:15:16 -0400 (EDT) |
Hi
----- Original Message -----
> On Fri, Jul 28, 2017 at 04:13:09PM +0200, Marc-André Lureau wrote:
> > This adds two extra #ifdef that have fairly limited conflict potential.
> >
> > Signed-off-by: Marc-André Lureau <address@hidden>
>
> OK but why can't we keep all ifdefs in net/ where all the
> rest of the features are ifdef'ed?
>
We would need fallback code for vhost_user_get_* functions (see below).
> My concern is no one is going to test this weird configuration
> so we might accidentally re-enable it without noticing.
> net/net.c is where all command line play happens so
> people know a bunch of configs need to be tested when
> changing it.
I am not sure I understand your argument there. You are afraid we 'accidentaly
re-enable' vhost-user... and forget to remove those #ifdef?
I can imagine people don't like having code clutter with #ifdef, but I think
when it doesn't change much the logic (as in here with clean per-case
switch/if), it is fine, ymmv.
>
>
> > ---
> > hw/net/vhost_net.c | 4 ++++
> > net/Makefile.objs | 2 +-
> > 2 files changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> > index e037db63a3..96c4da49e4 100644
> > --- a/hw/net/vhost_net.c
> > +++ b/hw/net/vhost_net.c
> > @@ -193,6 +193,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions
> > *options)
> > }
> > }
> >
> > +#ifdef CONFIG_VHOST_USER
> > /* Set sane init value. Override when guest acks. */
> > if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
> > features = vhost_user_get_acked_features(net->nc);
> > @@ -203,6 +204,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions
> > *options)
> > goto fail;
> > }
> > }
> > +#endif
> >
> > vhost_net_ack_features(net, features);
> >
> > @@ -414,10 +416,12 @@ VHostNetState *get_vhost_net(NetClientState *nc)
> > case NET_CLIENT_DRIVER_TAP:
> > vhost_net = tap_get_vhost_net(nc);
> > break;
> > +#ifdef CONFIG_VHOST_USER
> > case NET_CLIENT_DRIVER_VHOST_USER:
> > vhost_net = vhost_user_get_vhost_net(nc);
> > assert(vhost_net);
> > break;
> > +#endif
> > default:
> > break;
> > }
> > diff --git a/net/Makefile.objs b/net/Makefile.objs
> > index 67ba5e26fb..7cac7ed1e4 100644
> > --- a/net/Makefile.objs
> > +++ b/net/Makefile.objs
> > @@ -3,7 +3,7 @@ common-obj-y += socket.o
> > common-obj-y += dump.o
> > common-obj-y += eth.o
> > common-obj-$(CONFIG_L2TPV3) += l2tpv3.o
> > -common-obj-$(CONFIG_POSIX) += vhost-user.o
> > +common-obj-$(CONFIG_VHOST_USER) += vhost-user.o
So we could have something like:
+common-obj-$(not CONFIG_VHOST_USER) += vhost-user-stubs.o
?
> > common-obj-$(CONFIG_SLIRP) += slirp.o
> > common-obj-$(CONFIG_VDE) += vde.o
> > common-obj-$(CONFIG_NETMAP) += netmap.o
> > --
> > 2.14.0.rc0.1.g40ca67566
>