mirror of
https://github.com/openvswitch/ovs
synced 2025-09-05 08:45:23 +00:00
9fe3b9a2ee
I introduced this a long time ago as an efficient way for userspace to find out whether and where an internal device was attached, but I've always considered it an ugly kluge. Now that ODP_VPORT_QUERY can fetch a vport's info regardless of datapath, it is no longer necessary. This commit stops using Ethtool for this purpose and drops the feature. Signed-off-by: Ben Pfaff <blp@nicira.com> Acked-by: Jesse Gross <jesse@nicira.com>
925 lines
25 KiB
C
925 lines
25 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "dpif-linux.h"
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <net/if.h>
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#include <linux/types.h>
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#include <linux/ethtool.h>
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#include <linux/pkt_sched.h>
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#include <linux/rtnetlink.h>
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#include <linux/sockios.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "dpif-provider.h"
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#include "netdev.h"
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#include "netdev-vport.h"
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#include "netlink.h"
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#include "ofpbuf.h"
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#include "openvswitch/tunnel.h"
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#include "packets.h"
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#include "poll-loop.h"
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#include "rtnetlink.h"
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#include "rtnetlink-link.h"
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#include "shash.h"
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#include "svec.h"
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#include "util.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(dpif_linux);
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/* Datapath interface for the openvswitch Linux kernel module. */
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struct dpif_linux {
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struct dpif dpif;
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int fd;
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/* Used by dpif_linux_get_all_names(). */
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char *local_ifname;
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int minor;
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/* Change notification. */
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int local_ifindex; /* Ifindex of local port. */
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struct shash changed_ports; /* Ports that have changed. */
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struct rtnetlink_notifier port_notifier;
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bool change_error;
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};
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static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
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static int do_ioctl(const struct dpif *, int cmd, const void *arg);
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static int lookup_internal_device(const char *name, int *dp_idx, int *port_no);
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static int lookup_minor(const char *name, int *minor);
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static int finish_open(struct dpif *, const char *local_ifname);
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static int get_openvswitch_major(void);
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static int create_minor(const char *name, int minor, struct dpif **dpifp);
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static int open_minor(int minor, struct dpif **dpifp);
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static int make_openvswitch_device(int minor, char **fnp);
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static void dpif_linux_port_changed(const struct rtnetlink_link_change *,
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void *dpif);
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static struct dpif_linux *
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dpif_linux_cast(const struct dpif *dpif)
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{
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dpif_assert_class(dpif, &dpif_linux_class);
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return CONTAINER_OF(dpif, struct dpif_linux, dpif);
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}
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static int
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dpif_linux_enumerate(struct svec *all_dps)
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{
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int major;
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int error;
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int i;
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/* Check that the Open vSwitch module is loaded. */
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major = get_openvswitch_major();
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if (major < 0) {
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return -major;
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}
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error = 0;
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for (i = 0; i < ODP_MAX; i++) {
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struct dpif *dpif;
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char devname[16];
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int retval;
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sprintf(devname, "dp%d", i);
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retval = dpif_open(devname, "system", &dpif);
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if (!retval) {
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svec_add(all_dps, devname);
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dpif_uninit(dpif, true);
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} else if (retval != ENODEV && !error) {
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error = retval;
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}
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}
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return error;
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}
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static int
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dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
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bool create, struct dpif **dpifp)
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{
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int minor;
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minor = !strncmp(name, "dp", 2)
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&& isdigit((unsigned char)name[2]) ? atoi(name + 2) : -1;
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if (create) {
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if (minor >= 0) {
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return create_minor(name, minor, dpifp);
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} else {
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/* Scan for unused minor number. */
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for (minor = 0; minor < ODP_MAX; minor++) {
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int error = create_minor(name, minor, dpifp);
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if (error != EBUSY) {
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return error;
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}
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}
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/* All datapath numbers in use. */
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return ENOBUFS;
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}
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} else {
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struct dpif_linux *dpif;
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struct odp_port port;
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int error;
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if (minor < 0) {
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error = lookup_minor(name, &minor);
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if (error) {
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return error;
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}
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}
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error = open_minor(minor, dpifp);
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if (error) {
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return error;
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}
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dpif = dpif_linux_cast(*dpifp);
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/* We need the local port's ifindex for the poll function. Start by
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* getting the local port's name. */
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memset(&port, 0, sizeof port);
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port.port = ODPP_LOCAL;
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if (ioctl(dpif->fd, ODP_VPORT_QUERY, &port)) {
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error = errno;
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if (error != ENODEV) {
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VLOG_WARN("%s: probe returned unexpected error: %s",
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dpif_name(*dpifp), strerror(error));
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}
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dpif_uninit(*dpifp, true);
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return error;
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}
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/* Then use that to finish up opening. */
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return finish_open(&dpif->dpif, port.devname);
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}
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}
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static void
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dpif_linux_close(struct dpif *dpif_)
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{
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struct dpif_linux *dpif = dpif_linux_cast(dpif_);
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rtnetlink_link_notifier_unregister(&dpif->port_notifier);
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shash_destroy(&dpif->changed_ports);
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free(dpif->local_ifname);
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close(dpif->fd);
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free(dpif);
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}
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static int
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dpif_linux_get_all_names(const struct dpif *dpif_, struct svec *all_names)
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{
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struct dpif_linux *dpif = dpif_linux_cast(dpif_);
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svec_add_nocopy(all_names, xasprintf("dp%d", dpif->minor));
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svec_add(all_names, dpif->local_ifname);
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return 0;
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}
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static int
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dpif_linux_destroy(struct dpif *dpif_)
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{
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return do_ioctl(dpif_, ODP_DP_DESTROY, NULL);
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}
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static int
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dpif_linux_get_stats(const struct dpif *dpif_, struct odp_stats *stats)
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{
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memset(stats, 0, sizeof *stats);
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return do_ioctl(dpif_, ODP_DP_STATS, stats);
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}
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static int
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dpif_linux_get_drop_frags(const struct dpif *dpif_, bool *drop_fragsp)
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{
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int drop_frags;
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int error;
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error = do_ioctl(dpif_, ODP_GET_DROP_FRAGS, &drop_frags);
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if (!error) {
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*drop_fragsp = drop_frags & 1;
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}
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return error;
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}
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static int
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dpif_linux_set_drop_frags(struct dpif *dpif_, bool drop_frags)
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{
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int drop_frags_int = drop_frags;
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return do_ioctl(dpif_, ODP_SET_DROP_FRAGS, &drop_frags_int);
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}
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static void
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translate_vport_type_to_netdev_type(struct odp_port *port)
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{
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char *type = port->type;
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if (!strcmp(type, "netdev")) {
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ovs_strlcpy(type, "system", sizeof port->type);
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} else if (!strcmp(type, "gre")) {
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const struct tnl_port_config *config;
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config = (struct tnl_port_config *)port->config;
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if (config->flags & TNL_F_IPSEC) {
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ovs_strlcpy(type, "ipsec_gre", sizeof port->type);
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}
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}
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}
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static void
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translate_netdev_type_to_vport_type(struct odp_port *port)
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{
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char *type = port->type;
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if (!strcmp(type, "system")) {
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ovs_strlcpy(type, "netdev", sizeof port->type);
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} else if (!strcmp(type, "ipsec_gre")) {
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ovs_strlcpy(type, "gre", sizeof port->type);
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}
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}
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static int
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dpif_linux_port_add(struct dpif *dpif, struct netdev *netdev,
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uint16_t *port_nop)
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{
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const char *name = netdev_get_name(netdev);
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const char *type = netdev_get_type(netdev);
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struct odp_port port;
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int error;
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memset(&port, 0, sizeof port);
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strncpy(port.devname, name, sizeof port.devname);
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strncpy(port.type, type, sizeof port.type);
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netdev_vport_get_config(netdev, port.config);
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translate_netdev_type_to_vport_type(&port);
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error = do_ioctl(dpif, ODP_VPORT_ATTACH, &port);
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if (!error) {
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*port_nop = port.port;
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}
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return error;
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}
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static int
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dpif_linux_port_del(struct dpif *dpif_, uint16_t port_no_)
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{
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int port_no = port_no_; /* Kernel expects an "int". */
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return do_ioctl(dpif_, ODP_VPORT_DETACH, &port_no);
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}
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static int
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dpif_linux_port_query__(const struct dpif *dpif, struct odp_port *port)
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{
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int error = do_ioctl(dpif, ODP_VPORT_QUERY, port);
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if (!error) {
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translate_vport_type_to_netdev_type(port);
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}
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return error;
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}
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static int
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dpif_linux_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
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struct odp_port *port)
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{
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memset(port, 0, sizeof *port);
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port->port = port_no;
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return dpif_linux_port_query__(dpif, port);
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}
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static int
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dpif_linux_port_query_by_name(const struct dpif *dpif_, const char *devname,
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struct odp_port *port)
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{
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struct dpif_linux *dpif = dpif_linux_cast(dpif_);
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int error;
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memset(port, 0, sizeof *port);
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strncpy(port->devname, devname, sizeof port->devname);
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error = dpif_linux_port_query__(dpif_, port);
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if (!error && port->dp_idx != dpif->minor) {
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/* A vport named 'devname' exists but in some other datapath. */
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error = ENOENT;
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}
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return error;
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}
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static int
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dpif_linux_flow_flush(struct dpif *dpif_)
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{
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return do_ioctl(dpif_, ODP_FLOW_FLUSH, NULL);
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}
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static int
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dpif_linux_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
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{
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*statep = xzalloc(sizeof(struct odp_vport_dump));
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return 0;
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}
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static int
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dpif_linux_port_dump_next(const struct dpif *dpif, void *state,
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struct odp_port *port)
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{
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struct odp_vport_dump *dump = state;
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int error;
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dump->port = port;
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error = do_ioctl(dpif, ODP_VPORT_DUMP, dump);
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if (error) {
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return error;
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} else if (port->devname[0] == '\0') {
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return EOF;
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} else {
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dump->port_no = port->port + 1;
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translate_vport_type_to_netdev_type(port);
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return 0;
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}
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}
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static int
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dpif_linux_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state)
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{
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free(state);
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return 0;
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}
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static int
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dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
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{
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struct dpif_linux *dpif = dpif_linux_cast(dpif_);
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if (dpif->change_error) {
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dpif->change_error = false;
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shash_clear(&dpif->changed_ports);
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return ENOBUFS;
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} else if (!shash_is_empty(&dpif->changed_ports)) {
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struct shash_node *node = shash_first(&dpif->changed_ports);
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*devnamep = shash_steal(&dpif->changed_ports, node);
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return 0;
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} else {
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return EAGAIN;
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}
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}
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static void
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dpif_linux_port_poll_wait(const struct dpif *dpif_)
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{
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struct dpif_linux *dpif = dpif_linux_cast(dpif_);
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if (!shash_is_empty(&dpif->changed_ports) || dpif->change_error) {
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poll_immediate_wake();
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} else {
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rtnetlink_link_notifier_wait();
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}
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}
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static int
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dpif_linux_flow_get(const struct dpif *dpif_, struct odp_flow flows[], int n)
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{
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struct odp_flowvec fv;
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fv.flows = flows;
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fv.n_flows = n;
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return do_ioctl(dpif_, ODP_FLOW_GET, &fv);
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}
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static int
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dpif_linux_flow_put(struct dpif *dpif_, struct odp_flow_put *put)
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{
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return do_ioctl(dpif_, ODP_FLOW_PUT, put);
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}
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static int
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dpif_linux_flow_del(struct dpif *dpif_, struct odp_flow *flow)
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{
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return do_ioctl(dpif_, ODP_FLOW_DEL, flow);
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}
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static int
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dpif_linux_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
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{
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*statep = xzalloc(sizeof(struct odp_flow_dump));
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return 0;
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}
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static int
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dpif_linux_flow_dump_next(const struct dpif *dpif, void *state,
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struct odp_flow *flow)
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{
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struct odp_flow_dump *dump = state;
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int error;
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dump->flow = flow;
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error = do_ioctl(dpif, ODP_FLOW_DUMP, dump);
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return error ? error : flow->flags & ODPFF_EOF ? EOF : 0;
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}
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static int
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dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state)
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{
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free(state);
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return 0;
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}
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static int
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dpif_linux_execute(struct dpif *dpif_,
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const struct nlattr *actions, size_t actions_len,
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const struct ofpbuf *buf)
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{
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struct odp_execute execute;
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memset(&execute, 0, sizeof execute);
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execute.actions = (struct nlattr *) actions;
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execute.actions_len = actions_len;
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execute.data = buf->data;
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execute.length = buf->size;
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return do_ioctl(dpif_, ODP_EXECUTE, &execute);
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}
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static int
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dpif_linux_recv_get_mask(const struct dpif *dpif_, int *listen_mask)
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{
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return do_ioctl(dpif_, ODP_GET_LISTEN_MASK, listen_mask);
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}
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static int
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dpif_linux_recv_set_mask(struct dpif *dpif_, int listen_mask)
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{
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return do_ioctl(dpif_, ODP_SET_LISTEN_MASK, &listen_mask);
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}
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static int
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dpif_linux_get_sflow_probability(const struct dpif *dpif_,
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uint32_t *probability)
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{
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return do_ioctl(dpif_, ODP_GET_SFLOW_PROBABILITY, probability);
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}
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static int
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dpif_linux_set_sflow_probability(struct dpif *dpif_, uint32_t probability)
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{
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return do_ioctl(dpif_, ODP_SET_SFLOW_PROBABILITY, &probability);
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}
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static int
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dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
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uint32_t queue_id, uint32_t *priority)
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{
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if (queue_id < 0xf000) {
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*priority = TC_H_MAKE(1 << 16, queue_id + 1);
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return 0;
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} else {
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return EINVAL;
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}
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}
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static int
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parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall)
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{
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static const struct nl_policy odp_packet_policy[] = {
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/* Always present. */
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[ODP_PACKET_ATTR_TYPE] = { .type = NL_A_U32 },
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[ODP_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
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.min_len = ETH_HEADER_LEN },
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[ODP_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
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/* _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_internal_device(const char *name, int *dp_idx, int *port_no)
|
||
{
|
||
struct odp_port odp_port;
|
||
static int dp0_fd = -1;
|
||
|
||
if (dp0_fd < 0) {
|
||
int error;
|
||
char *fn;
|
||
|
||
error = make_openvswitch_device(0, &fn);
|
||
if (error) {
|
||
return error;
|
||
}
|
||
|
||
dp0_fd = open(fn, O_RDONLY | O_NONBLOCK);
|
||
if (dp0_fd < 0) {
|
||
VLOG_WARN_RL(&error_rl, "%s: open failed (%s)",
|
||
fn, strerror(errno));
|
||
free(fn);
|
||
return errno;
|
||
}
|
||
free(fn);
|
||
}
|
||
|
||
memset(&odp_port, 0, sizeof odp_port);
|
||
strncpy(odp_port.devname, name, sizeof odp_port.devname);
|
||
if (ioctl(dp0_fd, ODP_VPORT_QUERY, &odp_port)) {
|
||
if (errno != ENODEV) {
|
||
VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
|
||
name, strerror(errno));
|
||
}
|
||
return errno;
|
||
} else if (!strcmp(odp_port.type, "internal")) {
|
||
*dp_idx = odp_port.dp_idx;
|
||
*port_no = odp_port.port;
|
||
return 0;
|
||
} else {
|
||
return EINVAL;
|
||
}
|
||
}
|
||
|
||
static int
|
||
lookup_minor(const char *name, int *minorp)
|
||
{
|
||
int minor, port_no;
|
||
int error;
|
||
|
||
error = lookup_internal_device(name, &minor, &port_no);
|
||
if (error) {
|
||
return error;
|
||
} 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. */
|
||
return EOPNOTSUPP;
|
||
} else {
|
||
*minorp = minor;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
bool
|
||
dpif_linux_is_internal_device(const char *name)
|
||
{
|
||
int minor, port_no;
|
||
|
||
return !lookup_internal_device(name, &minor, &port_no);
|
||
}
|
||
|
||
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;
|
||
}
|
||
}
|