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Re: [Qemu-devel] [RFC] net: 'Remove vhostforce option in addition to vho
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [RFC] net: 'Remove vhostforce option in addition to vhost param' |
Date: |
Thu, 12 Feb 2015 11:29:32 +0100 |
On Thu, Feb 12, 2015 at 11:50:05AM +0530, Pankaj Gupta wrote:
> 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 <address@hidden>
The patch doesn't seem to do what it says.
Did you try with a non MSIX guest and vhost=on, to check that
it actually runs vhost and not userspace virtio?
> ---
> 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