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ovs/lib/dpif-linux.c
Ben Pfaff b0ec0f279e datapath: Change listing ports to use an iterator concept. 
One of the goals for Open vSwitch is to decouple kernel and userspace
software, so that either one can be upgraded or rolled back independent of
the other.  To do this in full generality, it must be possible to add new
features to the kernel vport layer without changing userspace software.  In
turn, that means that the odp_port structure must become variable-length.
This does not, however, fit in well with the ODP_PORT_LIST ioctl in its
current form, because that would require userspace to know how much space
to allocate for each port in advance, or to allocate as much space as
could possibly be needed.  Neither choice is very attractive.

This commit prepares for a different solution, by replacing ODP_PORT_LIST
by a new ioctl ODP_VPORT_DUMP that retrieves information about a single
vport from the datapath on each call.  It is much cleaner to allocate the
maximum amount of space for a single vport than to do so for possibly a
large number of vports.

It would be faster to retrieve a number of vports in batch instead of just
one at a time, but that will naturally happen later when the kernel
datapath interface is changed to use Netlink, so this patch does not bother
with it.

The Netlink version won't need to take the starting port number from
userspace, since Netlink sockets can keep track of that state as part
of their "dump" feature.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
2011-01-27 21:08:36 -08:00

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/*
* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "dpif.h"
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <net/if.h>
#include <linux/types.h>
#include <linux/ethtool.h>
#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "dpif-provider.h"
#include "netdev.h"
#include "netdev-vport.h"
#include "netlink.h"
#include "ofpbuf.h"
#include "openvswitch/tunnel.h"
#include "packets.h"
#include "poll-loop.h"
#include "rtnetlink.h"
#include "rtnetlink-link.h"
#include "shash.h"
#include "svec.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_linux);
/* Datapath interface for the openvswitch Linux kernel module. */
struct dpif_linux {
struct dpif dpif;
int fd;
/* Used by dpif_linux_get_all_names(). */
char *local_ifname;
int minor;
/* Change notification. */
int local_ifindex; /* Ifindex of local port. */
struct shash changed_ports; /* Ports that have changed. */
struct rtnetlink_notifier port_notifier;
bool change_error;
};
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
static int do_ioctl(const struct dpif *, int cmd, const void *arg);
static int lookup_minor(const char *name, int *minor);
static int finish_open(struct dpif *, const char *local_ifname);
static int get_openvswitch_major(void);
static int create_minor(const char *name, int minor, struct dpif **dpifp);
static int open_minor(int minor, struct dpif **dpifp);
static int make_openvswitch_device(int minor, char **fnp);
static void dpif_linux_port_changed(const struct rtnetlink_link_change *,
void *dpif);
static struct dpif_linux *
dpif_linux_cast(const struct dpif *dpif)
{
dpif_assert_class(dpif, &dpif_linux_class);
return CONTAINER_OF(dpif, struct dpif_linux, dpif);
}
static int
dpif_linux_enumerate(struct svec *all_dps)
{
int major;
int error;
int i;
/* Check that the Open vSwitch module is loaded. */
major = get_openvswitch_major();
if (major < 0) {
return -major;
}
error = 0;
for (i = 0; i < ODP_MAX; i++) {
struct dpif *dpif;
char devname[16];
int retval;
sprintf(devname, "dp%d", i);
retval = dpif_open(devname, "system", &dpif);
if (!retval) {
svec_add(all_dps, devname);
dpif_uninit(dpif, true);
} else if (retval != ENODEV && !error) {
error = retval;
}
}
return error;
}
static int
dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
bool create, struct dpif **dpifp)
{
int minor;
minor = !strncmp(name, "dp", 2)
&& isdigit((unsigned char)name[2]) ? atoi(name + 2) : -1;
if (create) {
if (minor >= 0) {
return create_minor(name, minor, dpifp);
} else {
/* Scan for unused minor number. */
for (minor = 0; minor < ODP_MAX; minor++) {
int error = create_minor(name, minor, dpifp);
if (error != EBUSY) {
return error;
}
}
/* All datapath numbers in use. */
return ENOBUFS;
}
} else {
struct dpif_linux *dpif;
struct odp_port port;
int error;
if (minor < 0) {
error = lookup_minor(name, &minor);
if (error) {
return error;
}
}
error = open_minor(minor, dpifp);
if (error) {
return error;
}
dpif = dpif_linux_cast(*dpifp);
/* We need the local port's ifindex for the poll function. Start by
* getting the local port's name. */
memset(&port, 0, sizeof port);
port.port = ODPP_LOCAL;
if (ioctl(dpif->fd, ODP_VPORT_QUERY, &port)) {
error = errno;
if (error != ENODEV) {
VLOG_WARN("%s: probe returned unexpected error: %s",
dpif_name(*dpifp), strerror(error));
}
dpif_uninit(*dpifp, true);
return error;
}
/* Then use that to finish up opening. */
return finish_open(&dpif->dpif, port.devname);
}
}
static void
dpif_linux_close(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
rtnetlink_link_notifier_unregister(&dpif->port_notifier);
shash_destroy(&dpif->changed_ports);
free(dpif->local_ifname);
close(dpif->fd);
free(dpif);
}
static int
dpif_linux_get_all_names(const struct dpif *dpif_, struct svec *all_names)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
svec_add_nocopy(all_names, xasprintf("dp%d", dpif->minor));
svec_add(all_names, dpif->local_ifname);
return 0;
}
static int
dpif_linux_destroy(struct dpif *dpif_)
{
return do_ioctl(dpif_, ODP_DP_DESTROY, NULL);
}
static int
dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
{
memset(stats, 0, sizeof *stats);
return do_ioctl(dpif_, ODP_DP_STATS, stats);
}
static int
dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
{
int drop_frags;
int error;
error = do_ioctl(dpif_, ODP_GET_DROP_FRAGS, &drop_frags);
if (!error) {
*drop_fragsp = drop_frags & 1;
}
return error;
}
static int
dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
{
int drop_frags_int = drop_frags;
return do_ioctl(dpif_, ODP_SET_DROP_FRAGS, &drop_frags_int);
}
static void
translate_vport_type_to_netdev_type(struct odp_port *port)
{
char *type = port->type;
if (!strcmp(type, "netdev")) {
ovs_strlcpy(type, "system", sizeof port->type);
} else if (!strcmp(type, "gre")) {
const struct tnl_port_config *config;
config = (struct tnl_port_config *)port->config;
if (config->flags & TNL_F_IPSEC) {
ovs_strlcpy(type, "ipsec_gre", sizeof port->type);
}
}
}
static void
translate_netdev_type_to_vport_type(struct odp_port *port)
{
char *type = port->type;
if (!strcmp(type, "system")) {
ovs_strlcpy(type, "netdev", sizeof port->type);
} else if (!strcmp(type, "ipsec_gre")) {
ovs_strlcpy(type, "gre", sizeof port->type);
}
}
static int
dpif_linux_port_add(struct dpif *dpif, struct netdev *netdev,
uint16_t *port_nop)
{
const char *name = netdev_get_name(netdev);
const char *type = netdev_get_type(netdev);
struct odp_port port;
int error;
memset(&port, 0, sizeof port);
strncpy(port.devname, name, sizeof port.devname);
strncpy(port.type, type, sizeof port.type);
netdev_vport_get_config(netdev, port.config);
translate_netdev_type_to_vport_type(&port);
error = do_ioctl(dpif, ODP_VPORT_ATTACH, &port);
if (!error) {
*port_nop = port.port;
}
return error;
}
static int
dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no_)
{
int port_no = port_no_; /* Kernel expects an "int". */
return do_ioctl(dpif_, ODP_VPORT_DETACH, &port_no);
}
static int
dpif_linux_port_query__(const struct dpif *dpif, struct odp_port *port)
{
int error = do_ioctl(dpif, ODP_VPORT_QUERY, port);
if (!error) {
translate_vport_type_to_netdev_type(port);
}
return error;
}
static int
dpif_linux_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct odp_port *port)
{
memset(port, 0, sizeof *port);
port->port = port_no;
return dpif_linux_port_query__(dpif, port);
}
static int
dpif_linux_port_query_by_name(const struct dpif *dpif, const char *devname,
struct odp_port *port)
{
memset(port, 0, sizeof *port);
strncpy(port->devname, devname, sizeof port->devname);
return dpif_linux_port_query__(dpif, port);
}
static int
dpif_linux_flow_flush(struct dpif *dpif_)
{
return do_ioctl(dpif_, ODP_FLOW_FLUSH, NULL);
}
static int
dpif_linux_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct odp_vport_dump));
return 0;
}
static int
dpif_linux_port_dump_next(const struct dpif *dpif, void *state,
struct odp_port *port)
{
struct odp_vport_dump *dump = state;
int error;
dump->port = port;
error = do_ioctl(dpif, ODP_VPORT_DUMP, dump);
if (error) {
return error;
} else if (port->devname[0] == '\0') {
return EOF;
} else {
dump->port_no = port->port + 1;
translate_vport_type_to_netdev_type(port);
return 0;
}
}
static int
dpif_linux_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state)
{
free(state);
return 0;
}
static int
dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->change_error) {
dpif->change_error = false;
shash_clear(&dpif->changed_ports);
return ENOBUFS;
} else if (!shash_is_empty(&dpif->changed_ports)) {
struct shash_node *node = shash_first(&dpif->changed_ports);
*devnamep = shash_steal(&dpif->changed_ports, node);
return 0;
} else {
return EAGAIN;
}
}
static void
dpif_linux_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (!shash_is_empty(&dpif->changed_ports) || dpif->change_error) {
poll_immediate_wake();
} else {
rtnetlink_link_notifier_wait();
}
}
static int
dpif_linux_flow_get(const struct dpif *dpif_, struct odp_flow flows[], int n)
{
struct odp_flowvec fv;
fv.flows = flows;
fv.n_flows = n;
return do_ioctl(dpif_, ODP_FLOW_GET, &fv);
}
static int
dpif_linux_flow_put(struct dpif *dpif_, struct odp_flow_put *put)
{
return do_ioctl(dpif_, ODP_FLOW_PUT, put);
}
static int
dpif_linux_flow_del(struct dpif *dpif_, struct odp_flow *flow)
{
return do_ioctl(dpif_, ODP_FLOW_DEL, flow);
}
static int
dpif_linux_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct odp_flow_dump));
return 0;
}
static int
dpif_linux_flow_dump_next(const struct dpif *dpif, void *state,
struct odp_flow *flow)
{
struct odp_flow_dump *dump = state;
int error;
dump->flow = flow;
error = do_ioctl(dpif, ODP_FLOW_DUMP, dump);
return error ? error : flow->flags & ODPFF_EOF ? EOF : 0;
}
static int
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state)
{
free(state);
return 0;
}
static int
dpif_linux_execute(struct dpif *dpif_,
const struct nlattr *actions, size_t actions_len,
const struct ofpbuf *buf)
{
struct odp_execute execute;
memset(&execute, 0, sizeof execute);
execute.actions = (struct nlattr *) actions;
execute.actions_len = actions_len;
execute.data = buf->data;
execute.length = buf->size;
return do_ioctl(dpif_, ODP_EXECUTE, &execute);
}
static int
dpif_linux_recv_get_mask(const struct dpif *dpif_, int *listen_mask)
{
return do_ioctl(dpif_, ODP_GET_LISTEN_MASK, listen_mask);
}
static int
dpif_linux_recv_set_mask(struct dpif *dpif_, int listen_mask)
{
return do_ioctl(dpif_, ODP_SET_LISTEN_MASK, &listen_mask);
}
static int
dpif_linux_get_sflow_probability(const struct dpif *dpif_,
uint32_t *probability)
{
return do_ioctl(dpif_, ODP_GET_SFLOW_PROBABILITY, probability);
}
static int
dpif_linux_set_sflow_probability(struct dpif *dpif_, uint32_t probability)
{
return do_ioctl(dpif_, ODP_SET_SFLOW_PROBABILITY, &probability);
}
static int
dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
uint32_t queue_id, uint32_t *priority)
{
if (queue_id < 0xf000) {
*priority = TC_H_MAKE(1 << 16, queue_id + 1);
return 0;
} else {
return EINVAL;
}
}
static int
parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall)
{
static const struct nl_policy odp_packet_policy[] = {
/* Always present. */
[ODP_PACKET_ATTR_TYPE] = { .type = NL_A_U32 },
[ODP_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
.min_len = ETH_HEADER_LEN },
[ODP_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
/* _ODPL_ACTION_NR only. */
[ODP_PACKET_ATTR_USERDATA] = { .type = NL_A_U64, .optional = true },
/* _ODPL_SFLOW_NR only. */
[ODP_PACKET_ATTR_SAMPLE_POOL] = { .type = NL_A_U32, .optional = true },
[ODP_PACKET_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
};
struct odp_packet *odp_packet = buf->data;
struct nlattr *a[ARRAY_SIZE(odp_packet_policy)];
if (!nl_policy_parse(buf, sizeof *odp_packet, odp_packet_policy,
a, ARRAY_SIZE(odp_packet_policy))) {
return EINVAL;
}
memset(upcall, 0, sizeof *upcall);
upcall->type = nl_attr_get_u32(a[ODP_PACKET_ATTR_TYPE]);
upcall->packet = buf;
upcall->packet->data = (void *) nl_attr_get(a[ODP_PACKET_ATTR_PACKET]);
upcall->packet->size = nl_attr_get_size(a[ODP_PACKET_ATTR_PACKET]);
upcall->key = (void *) nl_attr_get(a[ODP_PACKET_ATTR_KEY]);
upcall->key_len = nl_attr_get_size(a[ODP_PACKET_ATTR_KEY]);
upcall->userdata = (a[ODP_PACKET_ATTR_USERDATA]
? nl_attr_get_u64(a[ODP_PACKET_ATTR_USERDATA])
: 0);
upcall->sample_pool = (a[ODP_PACKET_ATTR_SAMPLE_POOL]
? nl_attr_get_u32(a[ODP_PACKET_ATTR_SAMPLE_POOL])
: 0);
if (a[ODP_PACKET_ATTR_ACTIONS]) {
upcall->actions = (void *) nl_attr_get(a[ODP_PACKET_ATTR_ACTIONS]);
upcall->actions_len = nl_attr_get_size(a[ODP_PACKET_ATTR_ACTIONS]);
}
return 0;
}
static int
dpif_linux_recv(struct dpif *dpif_, struct dpif_upcall *upcall)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct ofpbuf *buf;
int retval;
int error;
buf = ofpbuf_new(65536);
retval = read(dpif->fd, ofpbuf_tail(buf), ofpbuf_tailroom(buf));
if (retval < 0) {
error = errno;
if (error != EAGAIN) {
VLOG_WARN_RL(&error_rl, "%s: read failed: %s",
dpif_name(dpif_), strerror(error));
}
} else if (retval >= sizeof(struct odp_packet)) {
struct odp_packet *odp_packet = buf->data;
buf->size += retval;
if (odp_packet->len <= retval) {
error = parse_odp_packet(buf, upcall);
} else {
VLOG_WARN_RL(&error_rl, "%s: discarding message truncated "
"from %"PRIu32" bytes to %d",
dpif_name(dpif_), odp_packet->len, retval);
error = ERANGE;
}
} else if (!retval) {
VLOG_WARN_RL(&error_rl, "%s: unexpected end of file", dpif_name(dpif_));
error = EPROTO;
} else {
VLOG_WARN_RL(&error_rl, "%s: discarding too-short message (%d bytes)",
dpif_name(dpif_), retval);
error = ERANGE;
}
if (error) {
ofpbuf_delete(buf);
}
return error;
}
static void
dpif_linux_recv_wait(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
poll_fd_wait(dpif->fd, POLLIN);
}
const struct dpif_class dpif_linux_class = {
"system",
NULL,
NULL,
dpif_linux_enumerate,
dpif_linux_open,
dpif_linux_close,
dpif_linux_get_all_names,
dpif_linux_destroy,
dpif_linux_get_stats,
dpif_linux_get_drop_frags,
dpif_linux_set_drop_frags,
dpif_linux_port_add,
dpif_linux_port_del,
dpif_linux_port_query_by_number,
dpif_linux_port_query_by_name,
dpif_linux_port_dump_start,
dpif_linux_port_dump_next,
dpif_linux_port_dump_done,
dpif_linux_port_poll,
dpif_linux_port_poll_wait,
dpif_linux_flow_get,
dpif_linux_flow_put,
dpif_linux_flow_del,
dpif_linux_flow_flush,
dpif_linux_flow_dump_start,
dpif_linux_flow_dump_next,
dpif_linux_flow_dump_done,
dpif_linux_execute,
dpif_linux_recv_get_mask,
dpif_linux_recv_set_mask,
dpif_linux_get_sflow_probability,
dpif_linux_set_sflow_probability,
dpif_linux_queue_to_priority,
dpif_linux_recv,
dpif_linux_recv_wait,
};
static int get_openvswitch_major(void);
static int get_major(const char *target);
static int
do_ioctl(const struct dpif *dpif_, int cmd, const void *arg)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
return ioctl(dpif->fd, cmd, arg) ? errno : 0;
}
static int
lookup_minor(const char *name, int *minorp)
{
struct ethtool_drvinfo drvinfo;
int minor, port_no;
struct ifreq ifr;
int error;
int sock;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
VLOG_WARN("socket(AF_INET) failed: %s", strerror(errno));
error = errno;
goto error;
}
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
ifr.ifr_data = (caddr_t) &drvinfo;
memset(&drvinfo, 0, sizeof drvinfo);
drvinfo.cmd = ETHTOOL_GDRVINFO;
if (ioctl(sock, SIOCETHTOOL, &ifr)) {
VLOG_WARN("ioctl(SIOCETHTOOL) failed: %s", strerror(errno));
error = errno;
goto error_close_sock;
}
if (strcmp(drvinfo.driver, "openvswitch")) {
VLOG_WARN("%s is not an openvswitch device", name);
error = EOPNOTSUPP;
goto error_close_sock;
}
if (sscanf(drvinfo.bus_info, "%d.%d", &minor, &port_no) != 2) {
VLOG_WARN("%s ethtool bus_info has unexpected format", name);
error = EPROTOTYPE;
goto error_close_sock;
} else if (port_no != ODPP_LOCAL) {
/* This is an Open vSwitch device but not the local port. We
* intentionally support only using the name of the local port as the
* name of a datapath; otherwise, it would be too difficult to
* enumerate all the names of a datapath. */
error = EOPNOTSUPP;
goto error_close_sock;
}
*minorp = minor;
close(sock);
return 0;
error_close_sock:
close(sock);
error:
return error;
}
static int
make_openvswitch_device(int minor, char **fnp)
{
const char dirname[] = "/dev/net";
int major;
dev_t dev;
struct stat s;
char fn[128];
*fnp = NULL;
major = get_openvswitch_major();
if (major < 0) {
return -major;
}
dev = makedev(major, minor);
sprintf(fn, "%s/dp%d", dirname, minor);
if (!stat(fn, &s)) {
if (!S_ISCHR(s.st_mode)) {
VLOG_WARN_RL(&error_rl, "%s is not a character device, fixing",
fn);
} else if (s.st_rdev != dev) {
VLOG_WARN_RL(&error_rl,
"%s is device %u:%u but should be %u:%u, fixing",
fn, major(s.st_rdev), minor(s.st_rdev),
major(dev), minor(dev));
} else {
goto success;
}
if (unlink(fn)) {
VLOG_WARN_RL(&error_rl, "%s: unlink failed (%s)",
fn, strerror(errno));
return errno;
}
} else if (errno == ENOENT) {
if (stat(dirname, &s)) {
if (errno == ENOENT) {
if (mkdir(dirname, 0755)) {
VLOG_WARN_RL(&error_rl, "%s: mkdir failed (%s)",
dirname, strerror(errno));
return errno;
}
} else {
VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)",
dirname, strerror(errno));
return errno;
}
}
} else {
VLOG_WARN_RL(&error_rl, "%s: stat failed (%s)", fn, strerror(errno));
return errno;
}
/* The device needs to be created. */
if (mknod(fn, S_IFCHR | 0700, dev)) {
VLOG_WARN_RL(&error_rl,
"%s: creating character device %u:%u failed (%s)",
fn, major(dev), minor(dev), strerror(errno));
return errno;
}
success:
*fnp = xstrdup(fn);
return 0;
}
/* Return the major device number of the Open vSwitch device. If it
* cannot be determined, a negative errno is returned. */
static int
get_openvswitch_major(void)
{
static int openvswitch_major = -1;
if (openvswitch_major < 0) {
openvswitch_major = get_major("openvswitch");
}
return openvswitch_major;
}
static int
get_major(const char *target)
{
const char fn[] = "/proc/devices";
char line[128];
FILE *file;
int ln;
file = fopen(fn, "r");
if (!file) {
VLOG_ERR("opening %s failed (%s)", fn, strerror(errno));
return -errno;
}
for (ln = 1; fgets(line, sizeof line, file); ln++) {
char name[64];
int major;
if (!strncmp(line, "Character", 9) || line[0] == '\0') {
/* Nothing to do. */
} else if (!strncmp(line, "Block", 5)) {
/* We only want character devices, so skip the rest of the file. */
break;
} else if (sscanf(line, "%d %63s", &major, name)) {
if (!strcmp(name, target)) {
fclose(file);
return major;
}
} else {
VLOG_WARN_ONCE("%s:%d: syntax error", fn, ln);
}
}
fclose(file);
VLOG_ERR("%s: %s major not found (is the module loaded?)", fn, target);
return -ENODEV;
}
static int
finish_open(struct dpif *dpif_, const char *local_ifname)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
dpif->local_ifname = xstrdup(local_ifname);
dpif->local_ifindex = if_nametoindex(local_ifname);
if (!dpif->local_ifindex) {
int error = errno;
dpif_uninit(dpif_, true);
VLOG_WARN("could not get ifindex of %s device: %s",
local_ifname, strerror(errno));
return error;
}
return 0;
}
static int
create_minor(const char *name, int minor, struct dpif **dpifp)
{
int error = open_minor(minor, dpifp);
if (!error) {
error = do_ioctl(*dpifp, ODP_DP_CREATE, name);
if (!error) {
error = finish_open(*dpifp, name);
} else {
dpif_uninit(*dpifp, true);
}
}
return error;
}
static int
open_minor(int minor, struct dpif **dpifp)
{
int error;
char *fn;
int fd;
error = make_openvswitch_device(minor, &fn);
if (error) {
return error;
}
fd = open(fn, O_RDONLY | O_NONBLOCK);
if (fd >= 0) {
struct dpif_linux *dpif = xmalloc(sizeof *dpif);
error = rtnetlink_link_notifier_register(&dpif->port_notifier,
dpif_linux_port_changed,
dpif);
if (!error) {
char *name;
name = xasprintf("dp%d", minor);
dpif_init(&dpif->dpif, &dpif_linux_class, name, minor, minor);
free(name);
dpif->fd = fd;
dpif->local_ifname = NULL;
dpif->minor = minor;
dpif->local_ifindex = 0;
shash_init(&dpif->changed_ports);
dpif->change_error = false;
*dpifp = &dpif->dpif;
} else {
free(dpif);
}
} else {
error = errno;
VLOG_WARN("%s: open failed (%s)", fn, strerror(error));
}
free(fn);
return error;
}
static void
dpif_linux_port_changed(const struct rtnetlink_link_change *change,
void *dpif_)
{
struct dpif_linux *dpif = dpif_;
if (change) {
if (change->master_ifindex == dpif->local_ifindex
&& (change->nlmsg_type == RTM_NEWLINK
|| change->nlmsg_type == RTM_DELLINK))
{
/* Our datapath changed, either adding a new port or deleting an
* existing one. */
shash_add_once(&dpif->changed_ports, change->ifname, NULL);
}
} else {
dpif->change_error = true;
}
}
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