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tap: factor out common tap initialization 

This patch factors out the common initialization of tap into a new helper
net_init_tap_one(). This will be used by multiqueue tap patches.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jason Wang 2013-01-30 19:12:30 +08:00 committed by Anthony Liguori
parent 4e4f9ae7da
commit 5193e5fbb5
1 changed files with 73 additions and 57 deletions
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130
net/tap.c
View File

@ -591,6 +591,73 @@ static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
return fd;
}
static int net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
const char *model, const char *name,
const char *ifname, const char *script,
const char *downscript, const char *vhostfdname,
int vnet_hdr, int fd)
{
TAPState *s;
s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
if (!s) {
close(fd);
return -1;
}
if (tap_set_sndbuf(s->fd, tap) < 0) {
return -1;
}
if (tap->has_fd) {
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
} else if (tap->has_helper) {
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
tap->helper);
} else {
const char *downscript;
downscript = tap->has_downscript ? tap->downscript :
DEFAULT_NETWORK_DOWN_SCRIPT;
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"ifname=%s,script=%s,downscript=%s", ifname, script,
downscript);
if (strcmp(downscript, "no") != 0) {
snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
snprintf(s->down_script_arg, sizeof(s->down_script_arg),
"%s", ifname);
}
}
if (tap->has_vhost ? tap->vhost :
vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
int vhostfd;
if (tap->has_vhostfd) {
vhostfd = monitor_handle_fd_param(cur_mon, vhostfdname);
if (vhostfd == -1) {
return -1;
}
} else {
vhostfd = -1;
}
s->vhost_net = vhost_net_init(&s->nc, vhostfd,
tap->has_vhostforce && tap->vhostforce);
if (!s->vhost_net) {
error_report("vhost-net requested but could not be initialized");
return -1;
}
} else if (tap->has_vhostfd) {
error_report("vhostfd= is not valid without vhost");
return -1;
}
return 0;
}
int net_init_tap(const NetClientOptions *opts, const char *name,
NetClientState *peer)
{
@ -598,10 +665,10 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
int fd, vnet_hdr = 0;
const char *model;
TAPState *s;
/* for the no-fd, no-helper case */
const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
const char *downscript = NULL;
char ifname[128];
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_TAP);
@ -647,6 +714,8 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
} else {
script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
downscript = tap->has_downscript ? tap->downscript :
DEFAULT_NETWORK_DOWN_SCRIPT;
fd = net_tap_init(tap, &vnet_hdr, script, ifname, sizeof ifname);
if (fd == -1) {
return -1;
@ -655,62 +724,9 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
model = "tap";
}
s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
if (!s) {
close(fd);
return -1;
}
if (tap_set_sndbuf(s->fd, tap) < 0) {
return -1;
}
if (tap->has_fd) {
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
} else if (tap->has_helper) {
snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
tap->helper);
} else {
const char *downscript;
downscript = tap->has_downscript ? tap->downscript :
DEFAULT_NETWORK_DOWN_SCRIPT;
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"ifname=%s,script=%s,downscript=%s", ifname, script,
downscript);
if (strcmp(downscript, "no") != 0) {
snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname);
}
}
if (tap->has_vhost ? tap->vhost :
tap->has_vhostfd || (tap->has_vhostforce && tap->vhostforce)) {
int vhostfd;
if (tap->has_vhostfd) {
vhostfd = monitor_handle_fd_param(cur_mon, tap->vhostfd);
if (vhostfd == -1) {
return -1;
}
} else {
vhostfd = -1;
}
s->vhost_net = vhost_net_init(&s->nc, vhostfd,
tap->has_vhostforce && tap->vhostforce);
if (!s->vhost_net) {
error_report("vhost-net requested but could not be initialized");
return -1;
}
} else if (tap->has_vhostfd) {
error_report("vhostfd= is not valid without vhost");
return -1;
}
return 0;
return net_init_tap_one(tap, peer, model, name, ifname, script,
downscript, tap->has_vhostfd ? tap->vhostfd : NULL,
vnet_hdr, fd);
}
VHostNetState *tap_get_vhost_net(NetClientState *nc)