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ovs/lib/netdev.c
David Marchand cf7b86db1f dp-packet: Rework TCP segmentation. 
Rather than mark with a offload flags + mark with a segmentation size,
simply rely on the netdev implementation which sets a segmentation size
when appropriate.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
2025-06-19 21:03:09 +02:00

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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016, 2017 Nicira, Inc.
*
* 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 "netdev.h"
#include <errno.h>
#include <inttypes.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef _WIN32
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/ioctl.h>
#endif
#include "cmap.h"
#include "coverage.h"
#include "dpif.h"
#include "dp-packet.h"
#include "dp-packet-gso.h"
#include "openvswitch/dynamic-string.h"
#include "fatal-signal.h"
#include "hash.h"
#include "openvswitch/list.h"
#include "netdev-offload-provider.h"
#include "netdev-provider.h"
#include "netdev-vport.h"
#include "odp-netlink.h"
#include "openvswitch/json.h"
#include "openflow/openflow.h"
#include "packets.h"
#include "openvswitch/ofp-print.h"
#include "openvswitch/poll-loop.h"
#include "seq.h"
#include "openvswitch/shash.h"
#include "smap.h"
#include "socket-util.h"
#include "sset.h"
#include "svec.h"
#include "openvswitch/vlog.h"
#include "flow.h"
#include "userspace-tso.h"
#include "util.h"
#ifdef __linux__
#include "tc.h"
#endif
VLOG_DEFINE_THIS_MODULE(netdev);
COVERAGE_DEFINE(netdev_received);
COVERAGE_DEFINE(netdev_sent);
COVERAGE_DEFINE(netdev_add_router);
COVERAGE_DEFINE(netdev_get_stats);
COVERAGE_DEFINE(netdev_push_header_drops);
COVERAGE_DEFINE(netdev_soft_seg_good);
COVERAGE_DEFINE(netdev_soft_seg_drops);
struct netdev_saved_flags {
struct netdev *netdev;
struct ovs_list node; /* In struct netdev's saved_flags_list. */
enum netdev_flags saved_flags;
enum netdev_flags saved_values;
};
/* Protects 'netdev_shash' and the mutable members of struct netdev. */
static struct ovs_mutex netdev_mutex = OVS_MUTEX_INITIALIZER;
/* All created network devices. */
static struct shash netdev_shash OVS_GUARDED_BY(netdev_mutex)
= SHASH_INITIALIZER(&netdev_shash);
/* Mutual exclusion of */
static struct ovs_mutex netdev_class_mutex OVS_ACQ_BEFORE(netdev_mutex)
= OVS_MUTEX_INITIALIZER;
/* Contains 'struct netdev_registered_class'es. */
static struct cmap netdev_classes = CMAP_INITIALIZER;
struct netdev_registered_class {
struct cmap_node cmap_node; /* In 'netdev_classes', by class->type. */
const struct netdev_class *class;
/* Number of references: one for the class itself and one for every
* instance of the class. */
struct ovs_refcount refcnt;
};
/* This is set pretty low because we probably won't learn anything from the
* additional log messages. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
static void restore_all_flags(void *aux OVS_UNUSED);
void update_device_args(struct netdev *, const struct shash *args);
#ifdef HAVE_AF_XDP
void signal_remove_xdp(struct netdev *netdev);
#endif
int
netdev_n_txq(const struct netdev *netdev)
{
return netdev->n_txq;
}
int
netdev_n_rxq(const struct netdev *netdev)
{
return netdev->n_rxq;
}
bool
netdev_is_pmd(const struct netdev *netdev)
{
return netdev->netdev_class->is_pmd;
}
bool
netdev_has_tunnel_push_pop(const struct netdev *netdev)
{
return netdev->netdev_class->push_header
&& netdev->netdev_class->pop_header;
}
static void
netdev_initialize(void)
OVS_EXCLUDED(netdev_mutex)
{
static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
if (ovsthread_once_start(&once)) {
fatal_signal_add_hook(restore_all_flags, NULL, NULL, true);
netdev_vport_patch_register();
#ifdef __linux__
netdev_register_provider(&netdev_linux_class);
netdev_register_provider(&netdev_internal_class);
netdev_register_provider(&netdev_tap_class);
netdev_vport_tunnel_register();
netdev_register_flow_api_provider(&netdev_offload_tc);
#ifdef HAVE_AF_XDP
netdev_register_provider(&netdev_afxdp_class);
netdev_register_provider(&netdev_afxdp_nonpmd_class);
#endif
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__)
netdev_register_provider(&netdev_tap_class);
netdev_register_provider(&netdev_bsd_class);
#endif
#ifdef _WIN32
netdev_register_provider(&netdev_windows_class);
netdev_register_provider(&netdev_internal_class);
netdev_vport_tunnel_register();
#endif
ovsthread_once_done(&once);
}
}
/* Performs periodic work needed by all the various kinds of netdevs.
*
* If your program opens any netdevs, it must call this function within its
* main poll loop. */
void
netdev_run(void)
OVS_EXCLUDED(netdev_mutex)
{
netdev_initialize();
struct netdev_registered_class *rc;
CMAP_FOR_EACH (rc, cmap_node, &netdev_classes) {
if (rc->class->run) {
rc->class->run(rc->class);
}
}
}
/* Arranges for poll_block() to wake up when netdev_run() needs to be called.
*
* If your program opens any netdevs, it must call this function within its
* main poll loop. */
void
netdev_wait(void)
OVS_EXCLUDED(netdev_mutex)
{
netdev_initialize();
struct netdev_registered_class *rc;
CMAP_FOR_EACH (rc, cmap_node, &netdev_classes) {
if (rc->class->wait) {
rc->class->wait(rc->class);
}
}
}
static struct netdev_registered_class *
netdev_lookup_class(const char *type)
{
struct netdev_registered_class *rc;
CMAP_FOR_EACH_WITH_HASH (rc, cmap_node, hash_string(type, 0),
&netdev_classes) {
if (!strcmp(type, rc->class->type)) {
return rc;
}
}
return NULL;
}
/* Initializes and registers a new netdev provider. After successful
* registration, new netdevs of that type can be opened using netdev_open(). */
int
netdev_register_provider(const struct netdev_class *new_class)
OVS_EXCLUDED(netdev_class_mutex, netdev_mutex)
{
int error;
ovs_mutex_lock(&netdev_class_mutex);
if (netdev_lookup_class(new_class->type)) {
VLOG_WARN("attempted to register duplicate netdev provider: %s",
new_class->type);
error = EEXIST;
} else {
error = new_class->init ? new_class->init() : 0;
if (!error) {
struct netdev_registered_class *rc;
rc = xmalloc(sizeof *rc);
cmap_insert(&netdev_classes, &rc->cmap_node,
hash_string(new_class->type, 0));
rc->class = new_class;
ovs_refcount_init(&rc->refcnt);
} else {
VLOG_ERR("failed to initialize %s network device class: %s",
new_class->type, ovs_strerror(error));
}
}
ovs_mutex_unlock(&netdev_class_mutex);
return error;
}
/* Unregisters a netdev provider. 'type' must have been previously registered
* and not currently be in use by any netdevs. After unregistration new
* netdevs of that type cannot be opened using netdev_open(). (However, the
* provider may still be accessible from other threads until the next RCU grace
* period, so the caller must not free or re-register the same netdev_class
* until that has passed.) */
int
netdev_unregister_provider(const char *type)
OVS_EXCLUDED(netdev_class_mutex, netdev_mutex)
{
struct netdev_registered_class *rc;
int error;
netdev_initialize();
ovs_mutex_lock(&netdev_class_mutex);
rc = netdev_lookup_class(type);
if (!rc) {
VLOG_WARN("attempted to unregister a netdev provider that is not "
"registered: %s", type);
error = EAFNOSUPPORT;
} else if (ovs_refcount_unref(&rc->refcnt) != 1) {
ovs_refcount_ref(&rc->refcnt);
VLOG_WARN("attempted to unregister in use netdev provider: %s",
type);
error = EBUSY;
} else {
cmap_remove(&netdev_classes, &rc->cmap_node,
hash_string(rc->class->type, 0));
ovsrcu_postpone(free, rc);
error = 0;
}
ovs_mutex_unlock(&netdev_class_mutex);
return error;
}
/* Clears 'types' and enumerates the types of all currently registered netdev
* providers into it. The caller must first initialize the sset. */
void
netdev_enumerate_types(struct sset *types)
OVS_EXCLUDED(netdev_mutex)
{
netdev_initialize();
sset_clear(types);
struct netdev_registered_class *rc;
CMAP_FOR_EACH (rc, cmap_node, &netdev_classes) {
sset_add(types, rc->class->type);
}
}
static const char *
netdev_vport_type_from_name(const char *name)
{
struct netdev_registered_class *rc;
const char *type;
CMAP_FOR_EACH (rc, cmap_node, &netdev_classes) {
const char *dpif_port = netdev_vport_class_get_dpif_port(rc->class);
if (dpif_port && !strncmp(name, dpif_port, strlen(dpif_port))) {
type = rc->class->type;
return type;
}
}
return NULL;
}
/* Check that the network device name is not the same as any of the registered
* vport providers' dpif_port name (dpif_port is NULL if the vport provider
* does not define it) or the datapath internal port name (e.g. ovs-system).
*
* Returns true if there is a name conflict, false otherwise. */
bool
netdev_is_reserved_name(const char *name)
OVS_EXCLUDED(netdev_mutex)
{
netdev_initialize();
struct netdev_registered_class *rc;
CMAP_FOR_EACH (rc, cmap_node, &netdev_classes) {
const char *dpif_port = netdev_vport_class_get_dpif_port(rc->class);
if (dpif_port && !strncmp(name, dpif_port, strlen(dpif_port))) {
return true;
}
}
if (!strncmp(name, "ovs-", 4)) {
struct sset types;
const char *type;
sset_init(&types);
dp_enumerate_types(&types);
SSET_FOR_EACH (type, &types) {
if (!strcmp(name+4, type)) {
sset_destroy(&types);
return true;
}
}
sset_destroy(&types);
}
return false;
}
/* Opens the network device named 'name' (e.g. "eth0") of the specified 'type'
* (e.g. "system") and returns zero if successful, otherwise a positive errno
* value. On success, sets '*netdevp' to the new network device, otherwise to
* null.
*
* Some network devices may need to be configured (with netdev_set_config())
* before they can be used.
*
* Before opening rxqs or sending packets, '*netdevp' may need to be
* reconfigured (with netdev_is_reconf_required() and netdev_reconfigure()).
* */
int
netdev_open(const char *name, const char *type, struct netdev **netdevp)
OVS_EXCLUDED(netdev_mutex)
{
struct netdev *netdev;
int error = 0;
if (!name[0]) {
/* Reject empty names. This saves the providers having to do this. At
* least one screwed this up: the netdev-linux "tap" implementation
* passed the name directly to the Linux TUNSETIFF call, which treats
* an empty string as a request to generate a unique name. */
return EINVAL;
}
netdev_initialize();
ovs_mutex_lock(&netdev_mutex);
netdev = shash_find_data(&netdev_shash, name);
if (netdev && type && type[0]) {
if (strcmp(type, netdev->netdev_class->type)) {
if (netdev->auto_classified) {
/* If this device was first created without a classification
* type, for example due to routing or tunneling code, and they
* keep a reference, a "classified" call to open will fail.
* In this case we remove the classless device, and re-add it
* below. We remove the netdev from the shash, and change the
* sequence, so owners of the old classless device can
* release/cleanup. */
if (netdev->node) {
shash_delete(&netdev_shash, netdev->node);
netdev->node = NULL;
netdev_change_seq_changed(netdev);
}
netdev = NULL;
} else {
error = EEXIST;
}
} else if (netdev->auto_classified) {
/* If netdev reopened with type "system", clear auto_classified. */
netdev->auto_classified = false;
}
}
if (!netdev) {
struct netdev_registered_class *rc;
rc = netdev_lookup_class(type && type[0] ? type : "system");
if (rc && ovs_refcount_try_ref_rcu(&rc->refcnt)) {
netdev = rc->class->alloc();
if (netdev) {
memset(netdev, 0, sizeof *netdev);
netdev->netdev_class = rc->class;
netdev->auto_classified = type && type[0] ? false : true;
netdev->name = xstrdup(name);
netdev->change_seq = 1;
netdev->reconfigure_seq = seq_create();
netdev->last_reconfigure_seq =
seq_read(netdev->reconfigure_seq);
ovsrcu_set(&netdev->flow_api, NULL);
netdev->hw_info.oor = false;
atomic_init(&netdev->hw_info.miss_api_supported, false);
netdev->node = shash_add(&netdev_shash, name, netdev);
/* By default enable one tx and rx queue per netdev. */
netdev->n_txq = netdev->netdev_class->send ? 1 : 0;
netdev->n_rxq = netdev->netdev_class->rxq_alloc ? 1 : 0;
ovs_list_init(&netdev->saved_flags_list);
error = rc->class->construct(netdev);
if (!error) {
netdev_change_seq_changed(netdev);
} else {
ovs_refcount_unref(&rc->refcnt);
seq_destroy(netdev->reconfigure_seq);
free(netdev->name);
ovs_assert(ovs_list_is_empty(&netdev->saved_flags_list));
shash_delete(&netdev_shash, netdev->node);
rc->class->dealloc(netdev);
}
} else {
error = ENOMEM;
}
} else {
VLOG_WARN("could not create netdev %s of unknown type %s",
name, type);
error = EAFNOSUPPORT;
}
}
if (!error) {
netdev->ref_cnt++;
*netdevp = netdev;
} else {
*netdevp = NULL;
}
ovs_mutex_unlock(&netdev_mutex);
return error;
}
/* Returns a reference to 'netdev_' for the caller to own. Returns null if
* 'netdev_' is null. */
struct netdev *
netdev_ref(const struct netdev *netdev_)
OVS_EXCLUDED(netdev_mutex)
{
struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
if (netdev) {
ovs_mutex_lock(&netdev_mutex);
ovs_assert(netdev->ref_cnt > 0);
netdev->ref_cnt++;
ovs_mutex_unlock(&netdev_mutex);
}
return netdev;
}
/* Reconfigures the device 'netdev' with 'args'. 'args' may be empty
* or NULL if none are needed. */
int
netdev_set_config(struct netdev *netdev, const struct smap *args, char **errp)
OVS_EXCLUDED(netdev_mutex)
{
if (netdev->netdev_class->set_config) {
const struct smap no_args = SMAP_INITIALIZER(&no_args);
char *verbose_error = NULL;
int error;
error = netdev->netdev_class->set_config(netdev,
args ? args : &no_args,
&verbose_error);
if (error) {
VLOG_WARN_BUF(verbose_error ? NULL : errp,
"%s: could not set configuration (%s)",
netdev_get_name(netdev), ovs_strerror(error));
if (verbose_error) {
if (errp) {
*errp = verbose_error;
} else {
free(verbose_error);
}
}
}
return error;
} else if (args && !smap_is_empty(args)) {
VLOG_WARN_BUF(errp, "%s: arguments provided to device that is not configurable",
netdev_get_name(netdev));
}
return 0;
}
/* Returns the current configuration for 'netdev' in 'args'. The caller must
* have already initialized 'args' with smap_init(). Returns 0 on success, in
* which case 'args' will be filled with 'netdev''s configuration. On failure
* returns a positive errno value, in which case 'args' will be empty.
*
* The caller owns 'args' and its contents and must eventually free them with
* smap_destroy(). */
int
netdev_get_config(const struct netdev *netdev, struct smap *args)
OVS_EXCLUDED(netdev_mutex)
{
int error;
smap_clear(args);
if (netdev->netdev_class->get_config) {
error = netdev->netdev_class->get_config(netdev, args);
if (error) {
smap_clear(args);
}
} else {
error = 0;
}
return error;
}
const struct netdev_tunnel_config *
netdev_get_tunnel_config(const struct netdev *netdev)
OVS_EXCLUDED(netdev_mutex)
{
if (netdev->netdev_class->get_tunnel_config) {
return netdev->netdev_class->get_tunnel_config(netdev);
} else {
return NULL;
}
}
/* Returns the id of the numa node the 'netdev' is on. If the function
* is not implemented, returns NETDEV_NUMA_UNSPEC. */
int
netdev_get_numa_id(const struct netdev *netdev)
{
if (netdev->netdev_class->get_numa_id) {
return netdev->netdev_class->get_numa_id(netdev);
} else {
return NETDEV_NUMA_UNSPEC;
}
}
static void
netdev_unref(struct netdev *dev)
OVS_RELEASES(netdev_mutex)
{
ovs_assert(dev->ref_cnt);
if (!--dev->ref_cnt) {
const struct netdev_class *class = dev->netdev_class;
struct netdev_registered_class *rc;
netdev_uninit_flow_api(dev);
dev->netdev_class->destruct(dev);
if (dev->node) {
shash_delete(&netdev_shash, dev->node);
}
free(dev->name);
seq_destroy(dev->reconfigure_seq);
dev->netdev_class->dealloc(dev);
ovs_mutex_unlock(&netdev_mutex);
rc = netdev_lookup_class(class->type);
ovs_refcount_unref(&rc->refcnt);
} else {
ovs_mutex_unlock(&netdev_mutex);
}
}
/* Closes and destroys 'netdev'. */
void
netdev_close(struct netdev *netdev)
OVS_EXCLUDED(netdev_mutex)
{
if (netdev) {
ovs_mutex_lock(&netdev_mutex);
netdev_unref(netdev);
}
}
/* Removes 'netdev' from the global shash and unrefs 'netdev'.
*
* This allows handler and revalidator threads to still retain references
* to this netdev while the main thread changes interface configuration.
*
* This function should only be called by the main thread when closing
* netdevs during user configuration changes. Otherwise, netdev_close should be
* used to close netdevs. */
void
netdev_remove(struct netdev *netdev)
{
if (netdev) {
ovs_mutex_lock(&netdev_mutex);
if (netdev->node) {
shash_delete(&netdev_shash, netdev->node);
netdev->node = NULL;
netdev_change_seq_changed(netdev);
}
netdev_unref(netdev);
}
}
/* Parses 'netdev_name_', which is of the form [type@]name into its component
* pieces. 'name' and 'type' must be freed by the caller. */
void
netdev_parse_name(const char *netdev_name_, char **name, char **type)
{
char *netdev_name = xstrdup(netdev_name_);
char *separator;
separator = strchr(netdev_name, '@');
if (separator) {
*separator = '\0';
*type = netdev_name;
*name = xstrdup(separator + 1);
} else {
*name = netdev_name;
*type = xstrdup("system");
}
}
/* Attempts to open a netdev_rxq handle for obtaining packets received on
* 'netdev'. On success, returns 0 and stores a nonnull 'netdev_rxq *' into
* '*rxp'. On failure, returns a positive errno value and stores NULL into
* '*rxp'.
*
* Some kinds of network devices might not support receiving packets. This
* function returns EOPNOTSUPP in that case.*/
int
netdev_rxq_open(struct netdev *netdev, struct netdev_rxq **rxp, int id)
OVS_EXCLUDED(netdev_mutex)
{
int error;
if (netdev->netdev_class->rxq_alloc && id < netdev->n_rxq) {
struct netdev_rxq *rx = netdev->netdev_class->rxq_alloc();
if (rx) {
rx->netdev = netdev;
rx->queue_id = id;
error = netdev->netdev_class->rxq_construct(rx);
if (!error) {
netdev_ref(netdev);
*rxp = rx;
return 0;
}
netdev->netdev_class->rxq_dealloc(rx);
} else {
error = ENOMEM;
}
} else {
error = EOPNOTSUPP;
}
*rxp = NULL;
return error;
}
/* Closes 'rx'. */
void
netdev_rxq_close(struct netdev_rxq *rx)
OVS_EXCLUDED(netdev_mutex)
{
if (rx) {
struct netdev *netdev = rx->netdev;
netdev->netdev_class->rxq_destruct(rx);
netdev->netdev_class->rxq_dealloc(rx);
netdev_close(netdev);
}
}
bool netdev_rxq_enabled(struct netdev_rxq *rx)
{
bool enabled = true;
if (rx->netdev->netdev_class->rxq_enabled) {
enabled = rx->netdev->netdev_class->rxq_enabled(rx);
}
return enabled;
}
/* Attempts to receive a batch of packets from 'rx'. 'batch' should point to
* the beginning of an array of NETDEV_MAX_BURST pointers to dp_packet. If
* successful, this function stores pointers to up to NETDEV_MAX_BURST
* dp_packets into the array, transferring ownership of the packets to the
* caller, stores the number of received packets in 'batch->count', and returns
* 0.
*
* The implementation does not necessarily initialize any non-data members of
* 'batch'. That is, the caller must initialize layer pointers and metadata
* itself, if desired, e.g. with pkt_metadata_init() and miniflow_extract().
*
* Returns EAGAIN immediately if no packet is ready to be received or another
* positive errno value if an error was encountered. */
int
netdev_rxq_recv(struct netdev_rxq *rx, struct dp_packet_batch *batch,
int *qfill)
{
int retval;
retval = rx->netdev->netdev_class->rxq_recv(rx, batch, qfill);
if (!retval) {
COVERAGE_INC(netdev_received);
} else {
batch->count = 0;
}
return retval;
}
/* Arranges for poll_block() to wake up when a packet is ready to be received
* on 'rx'. */
void
netdev_rxq_wait(struct netdev_rxq *rx)
{
rx->netdev->netdev_class->rxq_wait(rx);
}
/* Discards any packets ready to be received on 'rx'. */
int
netdev_rxq_drain(struct netdev_rxq *rx)
{
return (rx->netdev->netdev_class->rxq_drain
? rx->netdev->netdev_class->rxq_drain(rx)
: 0);
}
/* Configures the number of tx queues of 'netdev'. Returns 0 if successful,
* otherwise a positive errno value.
*
* 'n_txq' specifies the exact number of transmission queues to create.
*
* The change might not effective immediately. The caller must check if a
* reconfiguration is required with netdev_is_reconf_required() and eventually
* call netdev_reconfigure() before using the new queues.
*
* On error, the tx queue configuration is unchanged */
int
netdev_set_tx_multiq(struct netdev *netdev, unsigned int n_txq)
{
int error;
error = (netdev->netdev_class->set_tx_multiq
? netdev->netdev_class->set_tx_multiq(netdev, MAX(n_txq, 1))
: EOPNOTSUPP);
if (error && error != EOPNOTSUPP) {
VLOG_DBG_RL(&rl, "failed to set tx queue for network device %s:"
"%s", netdev_get_name(netdev), ovs_strerror(error));
}
return error;
}
enum netdev_pt_mode
netdev_get_pt_mode(const struct netdev *netdev)
{
return (netdev->netdev_class->get_pt_mode
? netdev->netdev_class->get_pt_mode(netdev)
: NETDEV_PT_LEGACY_L2);
}
/* Attempts to segment GSO flagged packets and send them as multiple bundles.
* This function is only used if at least one packet in the current batch is
* flagged for TSO and the netdev does not support this.
*
* The return value is 0 if all batches sent successfully, and an error code
* from netdev_class->send() if at least one batch failed to send. */
static int
netdev_send_tso(struct netdev *netdev, int qid,
struct dp_packet_batch *batch, bool concurrent_txq)
{
struct dp_packet_batch *batches;
struct dp_packet *packet;
int retval = 0;
int n_packets;
int n_batches;
int error;
/* Calculate the total number of packets in the batch after
* the segmentation. */
n_packets = 0;
DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
if (dp_packet_get_tso_segsz(packet)) {
n_packets += dp_packet_gso_nr_segs(packet);
} else {
n_packets++;
}
}
if (!n_packets) {
return 0;
}
/* Allocate enough batches to store all the packets in order. */
n_batches = DIV_ROUND_UP(n_packets, NETDEV_MAX_BURST);
batches = xmalloc(n_batches * sizeof *batches);
struct dp_packet_batch *curr_batch = batches;
struct dp_packet_batch *last_batch = &batches[n_batches - 1];
for (curr_batch = batches; curr_batch <= last_batch; curr_batch++) {
dp_packet_batch_init(curr_batch);
}
/* Do the packet segmentation if TSO is flagged. */
size_t size = dp_packet_batch_size(batch);
size_t k;
curr_batch = batches;
DP_PACKET_BATCH_REFILL_FOR_EACH (k, size, packet, batch) {
if (dp_packet_get_tso_segsz(packet)) {
if (dp_packet_gso(packet, &curr_batch)) {
COVERAGE_INC(netdev_soft_seg_good);
} else {
COVERAGE_INC(netdev_soft_seg_drops);
}
dp_packet_delete(packet);
} else {
if (dp_packet_batch_is_full(curr_batch)) {
curr_batch++;
}
dp_packet_batch_add(curr_batch, packet);
}
}
for (curr_batch = batches; curr_batch <= last_batch; curr_batch++) {
DP_PACKET_BATCH_FOR_EACH (i, packet, curr_batch) {
dp_packet_ol_send_prepare(packet, netdev->ol_flags);
}
error = netdev->netdev_class->send(netdev, qid, curr_batch,
concurrent_txq);
if (!error) {
COVERAGE_INC(netdev_sent);
} else {
retval = error;
}
}
free(batches);
return retval;
}
/* Sends 'batch' on 'netdev'. Returns 0 if successful (for every packet),
* otherwise a positive errno value. Returns EAGAIN without blocking if
* at least one the packets cannot be queued immediately. Returns EMSGSIZE
* if a partial packet was transmitted or if a packet is too big or too small
* to transmit on the device.
*
* The caller must make sure that 'netdev' supports sending by making sure that
* 'netdev_n_txq(netdev)' returns >= 1.
*
* If the function returns a non-zero value, some of the packets might have
* been sent anyway.
*
* The caller transfers ownership of all the packets to the network device,
* regardless of success.
*
* If 'concurrent_txq' is true, the caller may perform concurrent calls
* to netdev_send() with the same 'qid'. The netdev provider is responsible
* for making sure that these concurrent calls do not create a race condition
* by using locking or other synchronization if required.
*
* The network device is expected to maintain one or more packet
* transmission queues, so that the caller does not ordinarily have to
* do additional queuing of packets. 'qid' specifies the queue to use
* and can be ignored if the implementation does not support multiple
* queues. */
int
netdev_send(struct netdev *netdev, int qid, struct dp_packet_batch *batch,
bool concurrent_txq)
{
const uint64_t netdev_flags = netdev->ol_flags;
struct dp_packet *packet;
int error;
if (userspace_tso_enabled()) {
if (!(netdev_flags & NETDEV_TX_OFFLOAD_TCP_TSO)) {
DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
if (dp_packet_get_tso_segsz(packet)) {
return netdev_send_tso(netdev, qid, batch, concurrent_txq);
}
}
} else if (!(netdev_flags & (NETDEV_TX_VXLAN_TNL_TSO |
NETDEV_TX_GRE_TNL_TSO |
NETDEV_TX_GENEVE_TNL_TSO))) {
DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
if (dp_packet_get_tso_segsz(packet)
&& dp_packet_tunnel(packet)) {
return netdev_send_tso(netdev, qid, batch, concurrent_txq);
}
}
} else if (!(netdev_flags & NETDEV_TX_OFFLOAD_OUTER_UDP_CKSUM)) {
DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
if (dp_packet_get_tso_segsz(packet)
&& (dp_packet_tunnel_vxlan(packet)
|| dp_packet_tunnel_geneve(packet))
&& dp_packet_l4_checksum_partial(packet)) {
return netdev_send_tso(netdev, qid, batch, concurrent_txq);
}
}
}
}
DP_PACKET_BATCH_FOR_EACH (i, packet, batch) {
dp_packet_ol_send_prepare(packet, netdev_flags);
}
error = netdev->netdev_class->send(netdev, qid, batch, concurrent_txq);
if (!error) {
COVERAGE_INC(netdev_sent);
}
return error;
}
/* Pop tunnel header, build tunnel metadata and resize 'batch->packets'
* for further processing.
*
* The caller must make sure that 'netdev' support this operation by checking
* that netdev_has_tunnel_push_pop() returns true. */
void
netdev_pop_header(struct netdev *netdev, struct dp_packet_batch *batch)
{
struct dp_packet *packet;
size_t i, size = dp_packet_batch_size(batch);
DP_PACKET_BATCH_REFILL_FOR_EACH (i, size, packet, batch) {
packet = netdev->netdev_class->pop_header(packet);
if (packet) {
/* Reset the offload flags if present, to avoid wrong
* interpretation in the further packet processing when
* recirculated.*/
dp_packet_reset_offload(packet);
pkt_metadata_init_conn(&packet->md);
dp_packet_batch_refill(batch, packet, i);
}
}
}
void
netdev_init_tnl_build_header_params(struct netdev_tnl_build_header_params *params,
const struct flow *tnl_flow,
const struct in6_addr *src,
struct eth_addr dmac,
struct eth_addr smac)
{
params->flow = tnl_flow;
params->dmac = dmac;
params->smac = smac;
params->s_ip = src;
params->is_ipv6 = !IN6_IS_ADDR_V4MAPPED(src);
}
int netdev_build_header(const struct netdev *netdev,
struct ovs_action_push_tnl *data,
const struct netdev_tnl_build_header_params *params)
{
if (netdev->netdev_class->build_header) {
return netdev->netdev_class->build_header(netdev, data, params);
}
return EOPNOTSUPP;
}
/* Push tunnel header (reading from tunnel metadata) and resize
* 'batch->packets' for further processing.
*
* The caller must make sure that 'netdev' support this operation by checking
* that netdev_has_tunnel_push_pop() returns true. */
int
netdev_push_header(const struct netdev *netdev,
struct dp_packet_batch *batch,
const struct ovs_action_push_tnl *data)
{
struct dp_packet *packet;
size_t i, size = dp_packet_batch_size(batch);
DP_PACKET_BATCH_REFILL_FOR_EACH (i, size, packet, batch) {
if (OVS_UNLIKELY(data->tnl_type != OVS_VPORT_TYPE_GENEVE &&
data->tnl_type != OVS_VPORT_TYPE_VXLAN &&
data->tnl_type != OVS_VPORT_TYPE_GRE &&
data->tnl_type != OVS_VPORT_TYPE_IP6GRE &&
dp_packet_get_tso_segsz(packet))) {
COVERAGE_INC(netdev_push_header_drops);
dp_packet_delete(packet);
VLOG_WARN_RL(&rl, "%s: Tunneling packets with TSO is not "
"supported for %s tunnels: packet dropped",
netdev_get_name(netdev), netdev_get_type(netdev));
} else {
if (data->tnl_type != OVS_VPORT_TYPE_GENEVE &&
data->tnl_type != OVS_VPORT_TYPE_VXLAN &&
data->tnl_type != OVS_VPORT_TYPE_GRE &&
data->tnl_type != OVS_VPORT_TYPE_IP6GRE) {
dp_packet_ol_send_prepare(packet, 0);
} else if (dp_packet_tunnel(packet)) {
if (dp_packet_get_tso_segsz(packet)) {
COVERAGE_INC(netdev_push_header_drops);
dp_packet_delete(packet);
VLOG_WARN_RL(&rl, "%s: Tunneling packets with TSO is not "
"supported with multiple levels of "
"VXLAN, GENEVE, or GRE encapsulation.",
netdev_get_name(netdev));
continue;
}
dp_packet_ol_send_prepare(packet, 0);
}
netdev->netdev_class->push_header(netdev, packet, data);
pkt_metadata_init(&packet->md, data->out_port);
dp_packet_batch_refill(batch, packet, i);
}
}
return 0;
}
/* Registers with the poll loop to wake up from the next call to poll_block()
* when the packet transmission queue has sufficient room to transmit a packet
* with netdev_send().
*
* The network device is expected to maintain one or more packet
* transmission queues, so that the caller does not ordinarily have to
* do additional queuing of packets. 'qid' specifies the queue to use
* and can be ignored if the implementation does not support multiple
* queues. */
void
netdev_send_wait(struct netdev *netdev, int qid)
{
if (netdev->netdev_class->send_wait) {
netdev->netdev_class->send_wait(netdev, qid);
}
}
/* Attempts to set 'netdev''s MAC address to 'mac'. Returns 0 if successful,
* otherwise a positive errno value. */
int
netdev_set_etheraddr(struct netdev *netdev, const struct eth_addr mac)
{
return netdev->netdev_class->set_etheraddr(netdev, mac);
}
/* Retrieves 'netdev''s MAC address. If successful, returns 0 and copies the
* the MAC address into 'mac'. On failure, returns a positive errno value and
* clears 'mac' to all-zeros. */
int
netdev_get_etheraddr(const struct netdev *netdev, struct eth_addr *mac)
{
int error;
error = netdev->netdev_class->get_etheraddr(netdev, mac);
if (error) {
memset(mac, 0, sizeof *mac);
}
return error;
}
/* Returns the name of the network device that 'netdev' represents,
* e.g. "eth0". The caller must not modify or free the returned string. */
const char *
netdev_get_name(const struct netdev *netdev)
{
return netdev->name;
}
/* Retrieves the MTU of 'netdev'. The MTU is the maximum size of transmitted
* (and received) packets, in bytes, not including the hardware header; thus,
* this is typically 1500 bytes for Ethernet devices.
*
* If successful, returns 0 and stores the MTU size in '*mtup'. Returns
* EOPNOTSUPP if 'netdev' does not have an MTU (as e.g. some tunnels do not).
* On other failure, returns a positive errno value. On failure, sets '*mtup'
* to 0. */
int
netdev_get_mtu(const struct netdev *netdev, int *mtup)
{
const struct netdev_class *class = netdev->netdev_class;
int error;
error = class->get_mtu ? class->get_mtu(netdev, mtup) : EOPNOTSUPP;
if (error) {
*mtup = 0;
if (error != EOPNOTSUPP) {
VLOG_DBG_RL(&rl, "failed to retrieve MTU for network device %s: "
"%s", netdev_get_name(netdev), ovs_strerror(error));
}
}
return error;
}
/* Sets the MTU of 'netdev'. The MTU is the maximum size of transmitted
* (and received) packets, in bytes.
*
* If successful, returns 0. Returns EOPNOTSUPP if 'netdev' does not have an
* MTU (as e.g. some tunnels do not). On other failure, returns a positive
* errno value. */
int
netdev_set_mtu(struct netdev *netdev, int mtu)
{
const struct netdev_class *class = netdev->netdev_class;
int error;
error = class->set_mtu ? class->set_mtu(netdev, mtu) : EOPNOTSUPP;
if (error && error != EOPNOTSUPP) {
VLOG_WARN_RL(&rl, "failed to set MTU for network device %s: %s",
netdev_get_name(netdev), ovs_strerror(error));
}
return error;
}
/* If 'user_config' is true, the user wants to control 'netdev''s MTU and we
* should not override it. If 'user_config' is false, we may adjust
* 'netdev''s MTU (e.g., if 'netdev' is internal). */
void
netdev_mtu_user_config(struct netdev *netdev, bool user_config)
{
if (netdev->mtu_user_config != user_config) {
netdev_change_seq_changed(netdev);
netdev->mtu_user_config = user_config;
}
}
/* Returns 'true' if the user explicitly specified an MTU value for 'netdev'.
* Otherwise, returns 'false', in which case we are allowed to adjust the
* device MTU. */
bool
netdev_mtu_is_user_config(struct netdev *netdev)
{
return netdev->mtu_user_config;
}
/* Returns the ifindex of 'netdev', if successful, as a positive number. On
* failure, returns a negative errno value.
*
* The desired semantics of the ifindex value are a combination of those
* specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An ifindex
* value should be unique within a host and remain stable at least until
* reboot. SNMP says an ifindex "ranges between 1 and the value of ifNumber"
* but many systems do not follow this rule anyhow.
*
* Some network devices may not implement support for this function. In such
* cases this function will always return -EOPNOTSUPP.
*/
int
netdev_get_ifindex(const struct netdev *netdev)
{
int (*get_ifindex)(const struct netdev *);
get_ifindex = netdev->netdev_class->get_ifindex;
return get_ifindex ? get_ifindex(netdev) : -EOPNOTSUPP;
}
/* Stores the features supported by 'netdev' into each of '*current',
* '*advertised', '*supported', and '*peer' that are non-null. Each value is a
* bitmap of "enum ofp_port_features" bits, in host byte order. Returns 0 if
* successful, otherwise a positive errno value. On failure, all of the
* passed-in values are set to 0.
*
* Some network devices may not implement support for this function. In such
* cases this function will always return EOPNOTSUPP. */
int
netdev_get_features(const struct netdev *netdev,
enum netdev_features *current,
enum netdev_features *advertised,
enum netdev_features *supported,
enum netdev_features *peer)
{
int (*get_features)(const struct netdev *netdev,
enum netdev_features *current,
enum netdev_features *advertised,
enum netdev_features *supported,
enum netdev_features *peer);
enum netdev_features dummy[4];
int error;
if (!current) {
current = &dummy[0];
}
if (!advertised) {
advertised = &dummy[1];
}
if (!supported) {
supported = &dummy[2];
}
if (!peer) {
peer = &dummy[3];
}
get_features = netdev->netdev_class->get_features;
error = get_features
? get_features(netdev, current, advertised, supported,
peer)
: EOPNOTSUPP;
if (error) {
*current = *advertised = *supported = *peer = 0;
}
return error;
}
int
netdev_get_speed(const struct netdev *netdev, uint32_t *current, uint32_t *max)
{
uint32_t current_dummy, max_dummy;
int error;
if (!current) {
current = &current_dummy;
}
if (!max) {
max = &max_dummy;
}
error = netdev->netdev_class->get_speed
? netdev->netdev_class->get_speed(netdev, current, max)
: EOPNOTSUPP;
if (error == EOPNOTSUPP) {
enum netdev_features current_f, supported_f;
error = netdev_get_features(netdev, &current_f, NULL,
&supported_f, NULL);
*current = netdev_features_to_bps(current_f, 0) / 1000000;
*max = netdev_features_to_bps(supported_f, 0) / 1000000;
} else if (error) {
*current = *max = 0;
}
return error;
}
/* Returns the maximum speed of a network connection that has the NETDEV_F_*
* bits in 'features', in bits per second. If no bits that indicate a speed
* are set in 'features', returns 'default_bps'. */
uint64_t
netdev_features_to_bps(enum netdev_features features,
uint64_t default_bps)
{
enum {
F_1000000MB = NETDEV_F_1TB_FD,
F_100000MB = NETDEV_F_100GB_FD,
F_40000MB = NETDEV_F_40GB_FD,
F_10000MB = NETDEV_F_10GB_FD,
F_1000MB = NETDEV_F_1GB_HD | NETDEV_F_1GB_FD,
F_100MB = NETDEV_F_100MB_HD | NETDEV_F_100MB_FD,
F_10MB = NETDEV_F_10MB_HD | NETDEV_F_10MB_FD
};
return ( features & F_1000000MB ? UINT64_C(1000000000000)
: features & F_100000MB ? UINT64_C(100000000000)
: features & F_40000MB ? UINT64_C(40000000000)
: features & F_10000MB ? UINT64_C(10000000000)
: features & F_1000MB ? UINT64_C(1000000000)
: features & F_100MB ? UINT64_C(100000000)
: features & F_10MB ? UINT64_C(10000000)
: default_bps);
}
/* Returns true if any of the NETDEV_F_* bits that indicate a full-duplex link
* are set in 'features', otherwise false. */
bool
netdev_features_is_full_duplex(enum netdev_features features)
{
return (features & (NETDEV_F_10MB_FD | NETDEV_F_100MB_FD | NETDEV_F_1GB_FD
| NETDEV_F_10GB_FD | NETDEV_F_40GB_FD
| NETDEV_F_100GB_FD | NETDEV_F_1TB_FD)) != 0;
}
/* Set the features advertised by 'netdev' to 'advertise'. Returns 0 if
* successful, otherwise a positive errno value. */
int
netdev_set_advertisements(struct netdev *netdev,
enum netdev_features advertise)
{
return (netdev->netdev_class->set_advertisements
? netdev->netdev_class->set_advertisements(
netdev, advertise)
: EOPNOTSUPP);
}
static const char *
netdev_feature_to_name(uint32_t bit)
{
enum netdev_features f = bit;
switch (f) {
case NETDEV_F_10MB_HD: return "10MB-HD";
case NETDEV_F_10MB_FD: return "10MB-FD";
case NETDEV_F_100MB_HD: return "100MB-HD";
case NETDEV_F_100MB_FD: return "100MB-FD";
case NETDEV_F_1GB_HD: return "1GB-HD";
case NETDEV_F_1GB_FD: return "1GB-FD";
case NETDEV_F_10GB_FD: return "10GB-FD";
case NETDEV_F_40GB_FD: return "40GB-FD";
case NETDEV_F_100GB_FD: return "100GB-FD";
case NETDEV_F_1TB_FD: return "1TB-FD";
case NETDEV_F_OTHER: return "OTHER";
case NETDEV_F_COPPER: return "COPPER";
case NETDEV_F_FIBER: return "FIBER";
case NETDEV_F_AUTONEG: return "AUTO_NEG";
case NETDEV_F_PAUSE: return "AUTO_PAUSE";
case NETDEV_F_PAUSE_ASYM: return "AUTO_PAUSE_ASYM";
}
return NULL;
}
void
netdev_features_format(struct ds *s, enum netdev_features features)
{
ofp_print_bit_names(s, features, netdev_feature_to_name, ' ');
ds_put_char(s, '\n');
}
/* Assigns 'addr' as 'netdev''s IPv4 address and 'mask' as its netmask. If
* 'addr' is INADDR_ANY, 'netdev''s IPv4 address is cleared. Returns a
* positive errno value. */
int
netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
{
return (netdev->netdev_class->set_in4
? netdev->netdev_class->set_in4(netdev, addr, mask)
: EOPNOTSUPP);
}
static int
netdev_get_addresses_by_name(const char *device_name,
struct in6_addr **addrsp, int *n_addrsp)
{
struct netdev *netdev;
int error = netdev_open(device_name, NULL, &netdev);
if (error) {
*addrsp = NULL;
*n_addrsp = 0;
return error;
}
struct in6_addr *masks;
error = netdev_get_addr_list(netdev, addrsp, &masks, n_addrsp);
netdev_close(netdev);
free(masks);
return error;
}
/* Obtains an IPv4 address from 'device_name' and save the address in '*in4'.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
{
struct in6_addr *addrs;
int n;
int error = netdev_get_addresses_by_name(device_name, &addrs, &n);
in4->s_addr = 0;
if (!error) {
error = ENOENT;
for (int i = 0; i < n; i++) {
if (IN6_IS_ADDR_V4MAPPED(&addrs[i])) {
in4->s_addr = in6_addr_get_mapped_ipv4(&addrs[i]);
error = 0;
break;
}
}
}
free(addrs);
return error;
}
/* Obtains an IPv4 or IPv6 address from 'device_name' and save the address in
* '*in6', representing IPv4 addresses as v6-mapped. Returns 0 if successful,
* otherwise a positive errno value. */
int
netdev_get_ip_by_name(const char *device_name, struct in6_addr *in6)
{
struct in6_addr *addrs;
int n;
int error = netdev_get_addresses_by_name(device_name, &addrs, &n);
*in6 = in6addr_any;
if (!error) {
error = ENOENT;
for (int i = 0; i < n; i++) {
if (!in6_is_lla(&addrs[i])) {
*in6 = addrs[i];
error = 0;
break;
}
}
}
free(addrs);
return error;
}
/* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds
* to 'netdev'. */
int
netdev_add_router(struct netdev *netdev, struct in_addr router)
{
COVERAGE_INC(netdev_add_router);
return (netdev->netdev_class->add_router
? netdev->netdev_class->add_router(netdev, router)
: EOPNOTSUPP);
}
/* Looks up the next hop for 'host' for the TCP/IP stack that corresponds to
* 'netdev'. If a route cannot not be determined, sets '*next_hop' to 0,
* '*netdev_name' to null, and returns a positive errno value. Otherwise, if a
* next hop is found, stores the next hop gateway's address (0 if 'host' is on
* a directly connected network) in '*next_hop' and a copy of the name of the
* device to reach 'host' in '*netdev_name', and returns 0. The caller is
* responsible for freeing '*netdev_name' (by calling free()). */
int
netdev_get_next_hop(const struct netdev *netdev,
const struct in_addr *host, struct in_addr *next_hop,
char **netdev_name)
{
int error = (netdev->netdev_class->get_next_hop
? netdev->netdev_class->get_next_hop(
host, next_hop, netdev_name)
: EOPNOTSUPP);
if (error) {
next_hop->s_addr = 0;
*netdev_name = NULL;
}
return error;
}
/* Populates 'smap' with status information.
*
* Populates 'smap' with 'netdev' specific status information. This
* information may be used to populate the status column of the Interface table
* as defined in ovs-vswitchd.conf.db(5). */
int
netdev_get_status(const struct netdev *netdev, struct smap *smap)
{
int err = EOPNOTSUPP;
/* Set offload status only if relevant. */
if (netdev_get_dpif_type(netdev) &&
strcmp(netdev_get_dpif_type(netdev), "system")) {
#define OL_ADD_STAT(name, bit) \
smap_add(smap, "tx_" name "_offload", \
netdev->ol_flags & bit ? "true" : "false");
OL_ADD_STAT("ip_csum", NETDEV_TX_OFFLOAD_IPV4_CKSUM);
OL_ADD_STAT("tcp_csum", NETDEV_TX_OFFLOAD_TCP_CKSUM);
OL_ADD_STAT("udp_csum", NETDEV_TX_OFFLOAD_UDP_CKSUM);
OL_ADD_STAT("sctp_csum", NETDEV_TX_OFFLOAD_SCTP_CKSUM);
OL_ADD_STAT("tcp_seg", NETDEV_TX_OFFLOAD_TCP_TSO);
OL_ADD_STAT("vxlan_tso", NETDEV_TX_VXLAN_TNL_TSO);
OL_ADD_STAT("gre_tso", NETDEV_TX_GRE_TNL_TSO);
OL_ADD_STAT("geneve_tso", NETDEV_TX_GENEVE_TNL_TSO);
OL_ADD_STAT("out_ip_csum", NETDEV_TX_OFFLOAD_OUTER_IP_CKSUM);
OL_ADD_STAT("out_udp_csum", NETDEV_TX_OFFLOAD_OUTER_UDP_CKSUM);
#undef OL_ADD_STAT
err = 0;
}
if (!netdev->netdev_class->get_status) {
return err;
}
return netdev->netdev_class->get_status(netdev, smap);
}
/* Returns all assigned IP address to 'netdev' and returns 0.
* API allocates array of address and masks and set it to
* '*addr' and '*mask'.
* Otherwise, returns a positive errno value and sets '*addr', '*mask
* and '*n_addr' to NULL.
*
* The following error values have well-defined meanings:
*
* - EADDRNOTAVAIL: 'netdev' has no assigned IPv6 address.
*
* - EOPNOTSUPP: No IPv6 network stack attached to 'netdev'.
*
* 'addr' may be null, in which case the address itself is not reported. */
int
netdev_get_addr_list(const struct netdev *netdev, struct in6_addr **addr,
struct in6_addr **mask, int *n_addr)
{
int error;
error = (netdev->netdev_class->get_addr_list
? netdev->netdev_class->get_addr_list(netdev, addr, mask, n_addr): EOPNOTSUPP);
if (error && addr) {
*addr = NULL;
*mask = NULL;
*n_addr = 0;
}
return error;
}
/* On 'netdev', turns off the flags in 'off' and then turns on the flags in
* 'on'. Returns 0 if successful, otherwise a positive errno value. */
static int
do_update_flags(struct netdev *netdev, enum netdev_flags off,
enum netdev_flags on, enum netdev_flags *old_flagsp,
struct netdev_saved_flags **sfp)
OVS_EXCLUDED(netdev_mutex)
{
struct netdev_saved_flags *sf = NULL;
enum netdev_flags old_flags;
int error;
error = netdev->netdev_class->update_flags(netdev, off & ~on, on,
&old_flags);
if (error) {
VLOG_WARN_RL(&rl, "failed to %s flags for network device %s: %s",
off || on ? "set" : "get", netdev_get_name(netdev),
ovs_strerror(error));
old_flags = 0;
} else if ((off || on) && sfp) {
enum netdev_flags new_flags = (old_flags & ~off) | on;
enum netdev_flags changed_flags = old_flags ^ new_flags;
if (changed_flags) {
ovs_mutex_lock(&netdev_mutex);
*sfp = sf = xmalloc(sizeof *sf);
sf->netdev = netdev;
ovs_list_push_front(&netdev->saved_flags_list, &sf->node);
sf->saved_flags = changed_flags;
sf->saved_values = changed_flags & new_flags;
netdev->ref_cnt++;
ovs_mutex_unlock(&netdev_mutex);
}
}
if (old_flagsp) {
*old_flagsp = old_flags;
}
if (sfp) {
*sfp = sf;
}
return error;
}
/* Obtains the current flags for 'netdev' and stores them into '*flagsp'.
* Returns 0 if successful, otherwise a positive errno value. On failure,
* stores 0 into '*flagsp'. */
int
netdev_get_flags(const struct netdev *netdev_, enum netdev_flags *flagsp)
{
struct netdev *netdev = CONST_CAST(struct netdev *, netdev_);
return do_update_flags(netdev, 0, 0, flagsp, NULL);
}
/* Sets the flags for 'netdev' to 'flags'.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_set_flags(struct netdev *netdev, enum netdev_flags flags,
struct netdev_saved_flags **sfp)
{
return do_update_flags(netdev, -1, flags, NULL, sfp);
}
/* Turns on the specified 'flags' on 'netdev':
*
* - On success, returns 0. If 'sfp' is nonnull, sets '*sfp' to a newly
* allocated 'struct netdev_saved_flags *' that may be passed to
* netdev_restore_flags() to restore the original values of 'flags' on
* 'netdev' (this will happen automatically at program termination if
* netdev_restore_flags() is never called) , or to NULL if no flags were
* actually changed.
*
* - On failure, returns a positive errno value. If 'sfp' is nonnull, sets
* '*sfp' to NULL. */
int
netdev_turn_flags_on(struct netdev *netdev, enum netdev_flags flags,
struct netdev_saved_flags **sfp)
{
return do_update_flags(netdev, 0, flags, NULL, sfp);
}
/* Turns off the specified 'flags' on 'netdev'. See netdev_turn_flags_on() for
* details of the interface. */
int
netdev_turn_flags_off(struct netdev *netdev, enum netdev_flags flags,
struct netdev_saved_flags **sfp)
{
return do_update_flags(netdev, flags, 0, NULL, sfp);
}
/* Restores the flags that were saved in 'sf', and destroys 'sf'.
* Does nothing if 'sf' is NULL. */
void
netdev_restore_flags(struct netdev_saved_flags *sf)
OVS_EXCLUDED(netdev_mutex)
{
if (sf) {
struct netdev *netdev = sf->netdev;
enum netdev_flags old_flags;
netdev->netdev_class->update_flags(netdev,
sf->saved_flags & sf->saved_values,
sf->saved_flags & ~sf->saved_values,
&old_flags);
ovs_mutex_lock(&netdev_mutex);
ovs_list_remove(&sf->node);
free(sf);
netdev_unref(netdev);
}
}
/* Looks up the ARP table entry for 'ip' on 'netdev'. If one exists and can be
* successfully retrieved, it stores the corresponding MAC address in 'mac' and
* returns 0. Otherwise, it returns a positive errno value; in particular,
* ENXIO indicates that there is no ARP table entry for 'ip' on 'netdev'. */
int
netdev_arp_lookup(const struct netdev *netdev,
ovs_be32 ip, struct eth_addr *mac)
{
int error = (netdev->netdev_class->arp_lookup
? netdev->netdev_class->arp_lookup(netdev, ip, mac)
: EOPNOTSUPP);
if (error) {
*mac = eth_addr_zero;
}
return error;
}
/* Returns true if carrier is active (link light is on) on 'netdev'. */
bool
netdev_get_carrier(const struct netdev *netdev)
{
int error;
enum netdev_flags flags;
bool carrier;
netdev_get_flags(netdev, &flags);
if (!(flags & NETDEV_UP)) {
return false;
}
if (!netdev->netdev_class->get_carrier) {
return true;
}
error = netdev->netdev_class->get_carrier(netdev, &carrier);
if (error) {
VLOG_DBG("%s: failed to get network device carrier status, assuming "
"down: %s", netdev_get_name(netdev), ovs_strerror(error));
carrier = false;
}
return carrier;
}
/* Returns the number of times 'netdev''s carrier has changed. */
long long int
netdev_get_carrier_resets(const struct netdev *netdev)
{
return (netdev->netdev_class->get_carrier_resets
? netdev->netdev_class->get_carrier_resets(netdev)
: 0);
}
/* Attempts to force netdev_get_carrier() to poll 'netdev''s MII registers for
* link status instead of checking 'netdev''s carrier. 'netdev''s MII
* registers will be polled once ever 'interval' milliseconds. If 'netdev'
* does not support MII, another method may be used as a fallback. If
* 'interval' is less than or equal to zero, reverts netdev_get_carrier() to
* its normal behavior.
*
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_set_miimon_interval(struct netdev *netdev, long long int interval)
{
return (netdev->netdev_class->set_miimon_interval
? netdev->netdev_class->set_miimon_interval(netdev, interval)
: EOPNOTSUPP);
}
/* Retrieves current device stats for 'netdev'. */
int
netdev_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
{
int error;
/* Statistics are initialized before passing it to particular device
* implementation so all values are filtered out by default. */
memset(stats, 0xFF, sizeof *stats);
COVERAGE_INC(netdev_get_stats);
error = (netdev->netdev_class->get_stats
? netdev->netdev_class->get_stats(netdev, stats)
: EOPNOTSUPP);
if (error) {
/* In case of error all statistics are filtered out */
memset(stats, 0xff, sizeof *stats);
}
return error;
}
/* Retrieves current device custom stats for 'netdev'. */
int
netdev_get_custom_stats(const struct netdev *netdev,
struct netdev_custom_stats *custom_stats)
{
int error;
memset(custom_stats, 0, sizeof *custom_stats);
error = (netdev->netdev_class->get_custom_stats
? netdev->netdev_class->get_custom_stats(netdev, custom_stats)
: EOPNOTSUPP);
return error;
}
/* Attempts to set input rate limiting (policing) policy, such that:
* - up to 'kbits_rate' kbps of traffic is accepted, with a maximum
* accumulative burst size of 'kbits' kb; and
* - up to 'kpkts' kpps of traffic is accepted, with a maximum
* accumulative burst size of 'kpkts' kilo packets.
*/
int
netdev_set_policing(struct netdev *netdev, uint32_t kbits_rate,
uint32_t kbits_burst, uint32_t kpkts_rate,
uint32_t kpkts_burst)
{
return (netdev->netdev_class->set_policing
? netdev->netdev_class->set_policing(netdev,
kbits_rate, kbits_burst, kpkts_rate, kpkts_burst)
: EOPNOTSUPP);
}
/* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves it
* empty if 'netdev' does not support QoS. Any names added to 'types' should
* be documented as valid for the "type" column in the "QoS" table in
* vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
*
* Every network device supports disabling QoS with a type of "", but this type
* will not be added to 'types'.
*
* The caller must initialize 'types' (e.g. with sset_init()) before calling
* this function. The caller is responsible for destroying 'types' (e.g. with
* sset_destroy()) when it is no longer needed.
*
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_get_qos_types(const struct netdev *netdev, struct sset *types)
{
const struct netdev_class *class = netdev->netdev_class;
return (class->get_qos_types
? class->get_qos_types(netdev, types)
: 0);
}
/* Queries 'netdev' for its capabilities regarding the specified 'type' of QoS,
* which should be "" or one of the types returned by netdev_get_qos_types()
* for 'netdev'. Returns 0 if successful, otherwise a positive errno value.
* On success, initializes 'caps' with the QoS capabilities; on failure, clears
* 'caps' to all zeros. */
int
netdev_get_qos_capabilities(const struct netdev *netdev, const char *type,
struct netdev_qos_capabilities *caps)
{
const struct netdev_class *class = netdev->netdev_class;
if (*type) {
int retval = (class->get_qos_capabilities
? class->get_qos_capabilities(netdev, type, caps)
: EOPNOTSUPP);
if (retval) {
memset(caps, 0, sizeof *caps);
}
return retval;
} else {
/* Every netdev supports turning off QoS. */
memset(caps, 0, sizeof *caps);
return 0;
}
}
/* Obtains the number of queues supported by 'netdev' for the specified 'type'
* of QoS. Returns 0 if successful, otherwise a positive errno value. Stores
* the number of queues (zero on failure) in '*n_queuesp'.
*
* This is just a simple wrapper around netdev_get_qos_capabilities(). */
int
netdev_get_n_queues(const struct netdev *netdev,
const char *type, unsigned int *n_queuesp)
{
struct netdev_qos_capabilities caps;
int retval;
retval = netdev_get_qos_capabilities(netdev, type, &caps);
*n_queuesp = caps.n_queues;
return retval;
}
/* Queries 'netdev' about its currently configured form of QoS. If successful,
* stores the name of the current form of QoS into '*typep', stores any details
* of configuration as string key-value pairs in 'details', and returns 0. On
* failure, sets '*typep' to NULL and returns a positive errno value.
*
* A '*typep' of "" indicates that QoS is currently disabled on 'netdev'.
*
* The caller must initialize 'details' as an empty smap (e.g. with
* smap_init()) before calling this function. The caller must free 'details'
* when it is no longer needed (e.g. with smap_destroy()).
*
* The caller must not modify or free '*typep'.
*
* '*typep' will be one of the types returned by netdev_get_qos_types() for
* 'netdev'. The contents of 'details' should be documented as valid for
* '*typep' in the "other_config" column in the "QoS" table in
* vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). */
int
netdev_get_qos(const struct netdev *netdev,
const char **typep, struct smap *details)
{
const struct netdev_class *class = netdev->netdev_class;
int retval;
if (class->get_qos) {
retval = class->get_qos(netdev, typep, details);
if (retval) {
*typep = NULL;
smap_clear(details);
}
return retval;
} else {
/* 'netdev' doesn't support QoS, so report that QoS is disabled. */
*typep = "";
return 0;
}
}
/* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to 'type'
* with details of configuration from 'details'. Returns 0 if successful,
* otherwise a positive errno value. On error, the previous QoS configuration
* is retained.
*
* When this function changes the type of QoS (not just 'details'), this also
* resets all queue configuration for 'netdev' to their defaults (which depend
* on the specific type of QoS). Otherwise, the queue configuration for
* 'netdev' is unchanged.
*
* 'type' should be "" (to disable QoS) or one of the types returned by
* netdev_get_qos_types() for 'netdev'. The contents of 'details' should be
* documented as valid for the given 'type' in the "other_config" column in the
* "QoS" table in vswitchd/vswitch.xml (which is built as
* ovs-vswitchd.conf.db(8)).
*
* NULL may be specified for 'details' if there are no configuration
* details. */
int
netdev_set_qos(struct netdev *netdev,
const char *type, const struct smap *details)
{
const struct netdev_class *class = netdev->netdev_class;
if (!type) {
type = "";
}
if (class->set_qos) {
if (!details) {
static const struct smap empty = SMAP_INITIALIZER(&empty);
details = &empty;
}
return class->set_qos(netdev, type, details);
} else {
return *type ? EOPNOTSUPP : 0;
}
}
/* Queries 'netdev' for information about the queue numbered 'queue_id'. If
* successful, adds that information as string key-value pairs to 'details'.
* Returns 0 if successful, otherwise a positive errno value.
*
* 'queue_id' must be less than the number of queues supported by 'netdev' for
* the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
*
* The returned contents of 'details' should be documented as valid for the
* given 'type' in the "other_config" column in the "Queue" table in
* vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
*
* The caller must initialize 'details' (e.g. with smap_init()) before calling
* this function. The caller must free 'details' when it is no longer needed
* (e.g. with smap_destroy()). */
int
netdev_get_queue(const struct netdev *netdev,
unsigned int queue_id, struct smap *details)
{
const struct netdev_class *class = netdev->netdev_class;
int retval;
retval = (class->get_queue
? class->get_queue(netdev, queue_id, details)
: EOPNOTSUPP);
if (retval) {
smap_clear(details);
}
return retval;
}
/* Configures the queue numbered 'queue_id' on 'netdev' with the key-value
* string pairs in 'details'. The contents of 'details' should be documented
* as valid for the given 'type' in the "other_config" column in the "Queue"
* table in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
* Returns 0 if successful, otherwise a positive errno value. On failure, the
* given queue's configuration should be unmodified.
*
* 'queue_id' must be less than the number of queues supported by 'netdev' for
* the current form of QoS (e.g. as returned by netdev_get_n_queues(netdev)).
*
* This function does not modify 'details', and the caller retains ownership of
* it. */
int
netdev_set_queue(struct netdev *netdev,
unsigned int queue_id, const struct smap *details)
{
const struct netdev_class *class = netdev->netdev_class;
return (class->set_queue
? class->set_queue(netdev, queue_id, details)
: EOPNOTSUPP);
}
/* Attempts to delete the queue numbered 'queue_id' from 'netdev'. Some kinds
* of QoS may have a fixed set of queues, in which case attempts to delete them
* will fail with EOPNOTSUPP.
*
* Returns 0 if successful, otherwise a positive errno value. On failure, the
* given queue will be unmodified.
*
* 'queue_id' must be less than the number of queues supported by 'netdev' for
* the current form of QoS (e.g. as returned by
* netdev_get_n_queues(netdev)). */
int
netdev_delete_queue(struct netdev *netdev, unsigned int queue_id)
{
const struct netdev_class *class = netdev->netdev_class;
return (class->delete_queue
? class->delete_queue(netdev, queue_id)
: EOPNOTSUPP);
}
/* Obtains statistics about 'queue_id' on 'netdev'. On success, returns 0 and
* fills 'stats' with the queue's statistics; individual members of 'stats' may
* be set to all-1-bits if the statistic is unavailable. On failure, returns a
* positive errno value and fills 'stats' with values indicating unsupported
* statistics. */
int
netdev_get_queue_stats(const struct netdev *netdev, unsigned int queue_id,
struct netdev_queue_stats *stats)
{
const struct netdev_class *class = netdev->netdev_class;
int retval;
retval = (class->get_queue_stats
? class->get_queue_stats(netdev, queue_id, stats)
: EOPNOTSUPP);
if (retval) {
stats->tx_bytes = UINT64_MAX;
stats->tx_packets = UINT64_MAX;
stats->tx_errors = UINT64_MAX;
stats->created = LLONG_MIN;
}
return retval;
}
/* Initializes 'dump' to begin dumping the queues in a netdev.
*
* This function provides no status indication. An error status for the entire
* dump operation is provided when it is completed by calling
* netdev_queue_dump_done().
*/
void
netdev_queue_dump_start(struct netdev_queue_dump *dump,
const struct netdev *netdev)
{
dump->netdev = netdev_ref(netdev);
if (netdev->netdev_class->queue_dump_start) {
dump->error = netdev->netdev_class->queue_dump_start(netdev,
&dump->state);
} else {
dump->error = EOPNOTSUPP;
}
}
/* Attempts to retrieve another queue from 'dump', which must have been
* initialized with netdev_queue_dump_start(). On success, stores a new queue
* ID into '*queue_id', fills 'details' with configuration details for the
* queue, and returns true. On failure, returns false.
*
* Queues are not necessarily dumped in increasing order of queue ID (or any
* other predictable order).
*
* Failure might indicate an actual error or merely that the last queue has
* been dumped. An error status for the entire dump operation is provided when
* it is completed by calling netdev_queue_dump_done().
*
* The returned contents of 'details' should be documented as valid for the
* given 'type' in the "other_config" column in the "Queue" table in
* vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)).
*
* The caller must initialize 'details' (e.g. with smap_init()) before calling
* this function. This function will clear and replace its contents. The
* caller must free 'details' when it is no longer needed (e.g. with
* smap_destroy()). */
bool
netdev_queue_dump_next(struct netdev_queue_dump *dump,
unsigned int *queue_id, struct smap *details)
{
smap_clear(details);
const struct netdev *netdev = dump->netdev;
if (dump->error) {
return false;
}
dump->error = netdev->netdev_class->queue_dump_next(netdev, dump->state,
queue_id, details);
if (dump->error) {
netdev->netdev_class->queue_dump_done(netdev, dump->state);
return false;
}
return true;
}
/* Completes queue table dump operation 'dump', which must have been
* initialized with netdev_queue_dump_start(). Returns 0 if the dump operation
* was error-free, otherwise a positive errno value describing the problem. */
int
netdev_queue_dump_done(struct netdev_queue_dump *dump)
{
const struct netdev *netdev = dump->netdev;
if (!dump->error && netdev->netdev_class->queue_dump_done) {
dump->error = netdev->netdev_class->queue_dump_done(netdev,
dump->state);
}
netdev_close(dump->netdev);
return dump->error == EOF ? 0 : dump->error;
}
/* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's ID,
* its statistics, and the 'aux' specified by the caller. The order of
* iteration is unspecified, but (when successful) each queue is visited
* exactly once.
*
* Calling this function may be more efficient than calling
* netdev_get_queue_stats() for every queue.
*
* 'cb' must not modify or free the statistics passed in.
*
* Returns 0 if successful, otherwise a positive errno value. On error, some
* configured queues may not have been included in the iteration. */
int
netdev_dump_queue_stats(const struct netdev *netdev,
netdev_dump_queue_stats_cb *cb, void *aux)
{
const struct netdev_class *class = netdev->netdev_class;
return (class->dump_queue_stats
? class->dump_queue_stats(netdev, cb, aux)
: EOPNOTSUPP);
}
/* Returns the class type of 'netdev'.
*
* The caller must not free the returned value. */
const char *
netdev_get_type(const struct netdev *netdev)
{
return netdev->netdev_class->type;
}
/* Returns the class associated with 'netdev'. */
const struct netdev_class *
netdev_get_class(const struct netdev *netdev)
{
return netdev->netdev_class;
}
/* Set the type of 'dpif' this 'netdev' belongs to. */
void
netdev_set_dpif_type(struct netdev *netdev, const char *type)
{
netdev->dpif_type = type;
}
/* Returns the type of 'dpif' this 'netdev' belongs to.
*
* The caller must not free the returned value. */
const char *
netdev_get_dpif_type(const struct netdev *netdev)
{
return netdev->dpif_type;
}
/* Returns the netdev with 'name' or NULL if there is none.
*
* The caller must free the returned netdev with netdev_close(). */
struct netdev *
netdev_from_name(const char *name)
OVS_EXCLUDED(netdev_mutex)
{
struct netdev *netdev;
ovs_mutex_lock(&netdev_mutex);
netdev = shash_find_data(&netdev_shash, name);
if (netdev) {
netdev->ref_cnt++;
}
ovs_mutex_unlock(&netdev_mutex);
return netdev;
}
/* Fills 'device_list' with devices that match 'netdev_class'.
*
* The caller is responsible for initializing and destroying 'device_list' and
* must close each device on the list. */
void
netdev_get_devices(const struct netdev_class *netdev_class,
struct shash *device_list)
OVS_EXCLUDED(netdev_mutex)
{
struct shash_node *node;
ovs_mutex_lock(&netdev_mutex);
SHASH_FOR_EACH (node, &netdev_shash) {
struct netdev *dev = node->data;
if (dev->netdev_class == netdev_class) {
dev->ref_cnt++;
shash_add(device_list, node->name, node->data);
}
}
ovs_mutex_unlock(&netdev_mutex);
}
/* Extracts pointers to all 'netdev-vports' into an array 'vports'
* and returns it. Stores the size of the array into '*size'.
*
* The caller is responsible for freeing 'vports' and must close
* each 'netdev-vport' in the list. */
struct netdev **
netdev_get_vports(size_t *size)
OVS_EXCLUDED(netdev_mutex)
{
struct netdev **vports;
struct shash_node *node;
size_t n = 0;
if (!size) {
return NULL;
}
/* Explicitly allocates big enough chunk of memory. */
ovs_mutex_lock(&netdev_mutex);
vports = xmalloc(shash_count(&netdev_shash) * sizeof *vports);
SHASH_FOR_EACH (node, &netdev_shash) {
struct netdev *dev = node->data;
if (netdev_vport_is_vport_class(dev->netdev_class)) {
dev->ref_cnt++;
vports[n] = dev;
n++;
}
}
ovs_mutex_unlock(&netdev_mutex);
*size = n;
return vports;
}
const char *
netdev_get_type_from_name(const char *name)
{
struct netdev *dev;
const char *type;
type = netdev_vport_type_from_name(name);
if (type == NULL) {
dev = netdev_from_name(name);
type = dev ? netdev_get_type(dev) : NULL;
netdev_close(dev);
}
return type;
}
struct netdev *
netdev_rxq_get_netdev(const struct netdev_rxq *rx)
{
ovs_assert(rx->netdev->ref_cnt > 0);
return rx->netdev;
}
const char *
netdev_rxq_get_name(const struct netdev_rxq *rx)
{
return netdev_get_name(netdev_rxq_get_netdev(rx));
}
int
netdev_rxq_get_queue_id(const struct netdev_rxq *rx)
{
return rx->queue_id;
}
static void
restore_all_flags(void *aux OVS_UNUSED)
{
struct shash_node *node;
SHASH_FOR_EACH (node, &netdev_shash) {
struct netdev *netdev = node->data;
const struct netdev_saved_flags *sf;
enum netdev_flags saved_values;
enum netdev_flags saved_flags;
saved_values = saved_flags = 0;
LIST_FOR_EACH (sf, node, &netdev->saved_flags_list) {
saved_flags |= sf->saved_flags;
saved_values &= ~sf->saved_flags;
saved_values |= sf->saved_flags & sf->saved_values;
}
if (saved_flags) {
enum netdev_flags old_flags;
netdev->netdev_class->update_flags(netdev,
saved_flags & saved_values,
saved_flags & ~saved_values,
&old_flags);
}
#ifdef HAVE_AF_XDP
if (netdev->netdev_class == &netdev_afxdp_class) {
signal_remove_xdp(netdev);
}
#endif
}
}
uint64_t
netdev_get_change_seq(const struct netdev *netdev)
{
uint64_t change_seq;
atomic_read_explicit(&CONST_CAST(struct netdev *, netdev)->change_seq,
&change_seq, memory_order_acquire);
return change_seq;
}
#ifndef _WIN32
/* This implementation is shared by Linux and BSD. */
static struct ifaddrs *if_addr_list;
static struct ovs_mutex if_addr_list_lock = OVS_MUTEX_INITIALIZER;
void
netdev_get_addrs_list_flush(void)
{
ovs_mutex_lock(&if_addr_list_lock);
if (if_addr_list) {
freeifaddrs(if_addr_list);
if_addr_list = NULL;
}
ovs_mutex_unlock(&if_addr_list_lock);
}
int
netdev_get_addrs(const char dev[], struct in6_addr **paddr,
struct in6_addr **pmask, int *n_in)
{
struct in6_addr *addr_array, *mask_array;
const struct ifaddrs *ifa;
int cnt = 0, i = 0;
int retries = 3;
ovs_mutex_lock(&if_addr_list_lock);
if (!if_addr_list) {
int err;
retry:
err = getifaddrs(&if_addr_list);
if (err) {
ovs_mutex_unlock(&if_addr_list_lock);
return -err;
}
retries--;
}
for (ifa = if_addr_list; ifa; ifa = ifa->ifa_next) {
if (!ifa->ifa_name) {
if (retries) {
/* Older versions of glibc have a bug on race condition with
* address addition which may cause one of the returned
* ifa_name values to be NULL. In such case, we know that we've
* got an inconsistent dump. Retry but beware of an endless
* loop. From glibc 2.28 and beyond, this workaround is not
* needed and should be eventually removed. */
freeifaddrs(if_addr_list);
goto retry;
} else {
VLOG_WARN("Proceeding with an inconsistent dump of "
"interfaces from the kernel. Some may be missing");
}
}
if (ifa->ifa_addr && ifa->ifa_name && ifa->ifa_netmask) {
int family;
family = ifa->ifa_addr->sa_family;
if (family == AF_INET || family == AF_INET6) {
if (!strncmp(ifa->ifa_name, dev, IFNAMSIZ)) {
cnt++;
}
}
}
}
if (!cnt) {
ovs_mutex_unlock(&if_addr_list_lock);
return EADDRNOTAVAIL;
}
addr_array = xzalloc(sizeof *addr_array * cnt);
mask_array = xzalloc(sizeof *mask_array * cnt);
for (ifa = if_addr_list; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_name
&& ifa->ifa_addr
&& ifa->ifa_netmask
&& !strncmp(ifa->ifa_name, dev, IFNAMSIZ)
&& sa_is_ip(ifa->ifa_addr)) {
addr_array[i] = sa_get_address(ifa->ifa_addr);
mask_array[i] = sa_get_address(ifa->ifa_netmask);
i++;
}
}
ovs_mutex_unlock(&if_addr_list_lock);
if (paddr) {
*n_in = cnt;
*paddr = addr_array;
*pmask = mask_array;
} else {
free(addr_array);
free(mask_array);
}
return 0;
}
#endif
void
netdev_wait_reconf_required(struct netdev *netdev)
{
seq_wait(netdev->reconfigure_seq, netdev->last_reconfigure_seq);
}
bool
netdev_is_reconf_required(struct netdev *netdev)
{
return seq_read(netdev->reconfigure_seq) != netdev->last_reconfigure_seq;
}
/* Give a chance to 'netdev' to reconfigure some of its parameters.
*
* If a module uses netdev_send() and netdev_rxq_recv(), it must call this
* function when netdev_is_reconf_required() returns true.
*
* Return 0 if successful, otherwise a positive errno value. If the
* reconfiguration fails the netdev will not be able to send or receive
* packets.
*
* When this function is called, no call to netdev_rxq_recv() or netdev_send()
* must be issued. */
int
netdev_reconfigure(struct netdev *netdev)
{
const struct netdev_class *class = netdev->netdev_class;
netdev->last_reconfigure_seq = seq_read(netdev->reconfigure_seq);
return (class->reconfigure
? class->reconfigure(netdev)
: EOPNOTSUPP);
}
void
netdev_free_custom_stats_counters(struct netdev_custom_stats *custom_stats)
{
if (custom_stats) {
if (custom_stats->counters) {
free(custom_stats->counters);
custom_stats->counters = NULL;
custom_stats->size = 0;
}
}
}
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