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tap: add vhost/vhostfd options

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This adds vhost binary option to tap, to enable vhost net accelerator.
Default is off for now, we'll be able to make default on long term
when we know it's stable.

vhostfd option can be used by management, to pass in the fd. Assigning
vhostfd implies vhost=on.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2010-03-17 13:08:24 +02:00 • committed by Anthony Liguori
parent d59700553e
commit 82b0d80ef6
3 changed files with 40 additions and 1 deletions
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29
net/tap.c
View file

@ -42,6 +42,8 @@
#include "net/tap-linux.h"
#include "hw/vhost_net.h"
/* Maximum GSO packet size (64k) plus plenty of room for
* the ethernet and virtio_net headers
*/
@ -58,6 +60,7 @@ typedef struct TAPState {
unsigned int has_vnet_hdr : 1;
unsigned int using_vnet_hdr : 1;
unsigned int has_ufo: 1;
VHostNetState *vhost_net;
} TAPState;
static int launch_script(const char *setup_script, const char *ifname, int fd);
@ -253,6 +256,10 @@ static void tap_cleanup(VLANClientState *nc)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
if (s->vhost_net) {
vhost_net_cleanup(s->vhost_net);
}
qemu_purge_queued_packets(nc);
if (s->down_script[0])
@ -308,6 +315,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan,
s->has_ufo = tap_probe_has_ufo(s->fd);
tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
tap_read_poll(s, 1);
s->vhost_net = NULL;
return s;
}
@ -457,5 +465,26 @@ int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan
}
}
if (qemu_opt_get_bool(opts, "vhost", !!qemu_opt_get(opts, "vhostfd"))) {
int vhostfd, r;
if (qemu_opt_get(opts, "vhostfd")) {
r = net_handle_fd_param(mon, qemu_opt_get(opts, "vhostfd"));
if (r == -1) {
return -1;
}
vhostfd = r;
} else {
vhostfd = -1;
}
s->vhost_net = vhost_net_init(&s->nc, vhostfd);
if (!s->vhost_net) {
error_report("vhost-net requested but could not be initialized");
return -1;
}
} else if (qemu_opt_get(opts, "vhostfd")) {
error_report("vhostfd= is not valid without vhost");
return -1;
}
return 0;
}