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tap: vhost busy polling support

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This patch add the capability of basic vhost net busy polling which is
supported by recent kernel. User could configure the maximum number of
us that could be spent on busy polling through a new property of tap
"poll-us".

Cc: Greg Kurz <groug@kaod.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2016-07-06 09:57:55 +08:00
parent 91d3550990
commit 69e87b3268
11 changed files with 70 additions and 6 deletions
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7
net/tap.c
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@ -663,6 +663,11 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
options.net_backend = &s->nc;
if (tap->has_poll_us) {
options.busyloop_timeout = tap->poll_us;
} else {
options.busyloop_timeout = 0;
}
if (vhostfdname) {
vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
@ -687,7 +692,7 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
return;
}
} else if (vhostfdname) {
error_setg(errp, "vhostfd= is not valid without vhost");
error_setg(errp, "vhostfd(s)= is not valid without vhost");
}
}