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ovs/lib/dpif-netdev.c
Alex Wang 71c24bb0f8 dpif-netdev: Fix memory leak. 
In dpif_netdev_flow_del() and dp_netdev_port_input(), the
referenced 'netdev_flow' is not un-referenced.  This causes
the leak of the struct's memory.

This commit fixes the above issue by calling dp_netdev_flow_unref()
after using the reference.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
2014-02-21 14:07:46 -08:00

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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 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 "dpif.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <unistd.h>
#include "classifier.h"
#include "csum.h"
#include "dpif.h"
#include "dpif-provider.h"
#include "dummy.h"
#include "dynamic-string.h"
#include "flow.h"
#include "hmap.h"
#include "latch.h"
#include "list.h"
#include "meta-flow.h"
#include "netdev.h"
#include "netdev-vport.h"
#include "netlink.h"
#include "odp-execute.h"
#include "odp-util.h"
#include "ofp-print.h"
#include "ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
#include "random.h"
#include "seq.h"
#include "shash.h"
#include "sset.h"
#include "timeval.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_netdev);
/* By default, choose a priority in the middle. */
#define NETDEV_RULE_PRIORITY 0x8000
/* Configuration parameters. */
enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */
/* Enough headroom to add a vlan tag, plus an extra 2 bytes to allow IP
* headers to be aligned on a 4-byte boundary. */
enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN };
/* Queues. */
enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */
enum { MAX_QUEUE_LEN = 128 }; /* Maximum number of packets per queue. */
enum { QUEUE_MASK = MAX_QUEUE_LEN - 1 };
BUILD_ASSERT_DECL(IS_POW2(MAX_QUEUE_LEN));
/* Protects against changes to 'dp_netdevs'. */
static struct ovs_mutex dp_netdev_mutex = OVS_MUTEX_INITIALIZER;
/* Contains all 'struct dp_netdev's. */
static struct shash dp_netdevs OVS_GUARDED_BY(dp_netdev_mutex)
= SHASH_INITIALIZER(&dp_netdevs);
struct dp_netdev_upcall {
struct dpif_upcall upcall; /* Queued upcall information. */
struct ofpbuf buf; /* ofpbuf instance for upcall.packet. */
};
/* A queue passing packets from a struct dp_netdev to its clients.
*
*
* Thread-safety
* =============
*
* Any access at all requires the owning 'dp_netdev''s queue_mutex. */
struct dp_netdev_queue {
struct dp_netdev_upcall upcalls[MAX_QUEUE_LEN] OVS_GUARDED;
unsigned int head OVS_GUARDED;
unsigned int tail OVS_GUARDED;
};
/* Datapath based on the network device interface from netdev.h.
*
*
* Thread-safety
* =============
*
* Some members, marked 'const', are immutable. Accessing other members
* requires synchronization, as noted in more detail below.
*
* Acquisition order is, from outermost to innermost:
*
* dp_netdev_mutex (global)
* port_rwlock
* flow_mutex
* cls.rwlock
* queue_mutex
*/
struct dp_netdev {
const struct dpif_class *const class;
const char *const name;
struct ovs_refcount ref_cnt;
atomic_flag destroyed;
/* Flows.
*
* Readers of 'cls' and 'flow_table' must take a 'cls->rwlock' read lock.
*
* Writers of 'cls' and 'flow_table' must take the 'flow_mutex' and then
* the 'cls->rwlock' write lock. (The outer 'flow_mutex' allows writers to
* atomically perform multiple operations on 'cls' and 'flow_table'.)
*/
struct ovs_mutex flow_mutex;
struct classifier cls; /* Classifier. Protected by cls.rwlock. */
struct hmap flow_table OVS_GUARDED; /* Flow table. */
/* Queues.
*
* Everything in 'queues' is protected by 'queue_mutex'. */
struct ovs_mutex queue_mutex;
struct dp_netdev_queue queues[N_QUEUES];
struct seq *queue_seq; /* Incremented whenever a packet is queued. */
/* Statistics.
*
* ovsthread_counter is internally synchronized. */
struct ovsthread_counter *n_hit; /* Number of flow table matches. */
struct ovsthread_counter *n_missed; /* Number of flow table misses. */
struct ovsthread_counter *n_lost; /* Number of misses not passed up. */
/* Ports.
*
* Any lookup into 'ports' or any access to the dp_netdev_ports found
* through 'ports' requires taking 'port_rwlock'. */
struct ovs_rwlock port_rwlock;
struct hmap ports OVS_GUARDED;
struct seq *port_seq; /* Incremented whenever a port changes. */
/* Forwarding threads. */
struct latch exit_latch;
struct dp_forwarder *forwarders;
size_t n_forwarders;
};
static struct dp_netdev_port *dp_netdev_lookup_port(const struct dp_netdev *dp,
odp_port_t)
OVS_REQ_RDLOCK(dp->port_rwlock);
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
struct hmap_node node; /* Node in dp_netdev's 'ports'. */
odp_port_t port_no;
struct netdev *netdev;
struct netdev_saved_flags *sf;
struct netdev_rx *rx;
char *type; /* Port type as requested by user. */
};
/* A flow in dp_netdev's 'flow_table'.
*
*
* Thread-safety
* =============
*
* Except near the beginning or ending of its lifespan, rule 'rule' belongs to
* its dp_netdev's classifier. The text below calls this classifier 'cls'.
*
* Motivation
* ----------
*
* The thread safety rules described here for "struct dp_netdev_flow" are
* motivated by two goals:
*
* - Prevent threads that read members of "struct dp_netdev_flow" from
* reading bad data due to changes by some thread concurrently modifying
* those members.
*
* - Prevent two threads making changes to members of a given "struct
* dp_netdev_flow" from interfering with each other.
*
*
* Rules
* -----
*
* A flow 'flow' may be accessed without a risk of being freed by code that
* holds a read-lock or write-lock on 'cls->rwlock' or that owns a reference to
* 'flow->ref_cnt' (or both). Code that needs to hold onto a flow for a while
* should take 'cls->rwlock', find the flow it needs, increment 'flow->ref_cnt'
* with dpif_netdev_flow_ref(), and drop 'cls->rwlock'.
*
* 'flow->ref_cnt' protects 'flow' from being freed. It doesn't protect the
* flow from being deleted from 'cls' (that's 'cls->rwlock') and it doesn't
* protect members of 'flow' from modification (that's 'flow->mutex').
*
* 'flow->mutex' protects the members of 'flow' from modification. It doesn't
* protect the flow from being deleted from 'cls' (that's 'cls->rwlock') and it
* doesn't prevent the flow from being freed (that's 'flow->ref_cnt').
*
* Some members, marked 'const', are immutable. Accessing other members
* requires synchronization, as noted in more detail below.
*/
struct dp_netdev_flow {
/* Packet classification. */
const struct cls_rule cr; /* In owning dp_netdev's 'cls'. */
/* Hash table index by unmasked flow. */
const struct hmap_node node; /* In owning dp_netdev's 'flow_table'. */
const struct flow flow; /* The flow that created this entry. */
/* Number of references.
* The classifier owns one reference.
* Any thread trying to keep a rule from being freed should hold its own
* reference. */
struct ovs_refcount ref_cnt;
/* Protects members marked OVS_GUARDED.
*
* Acquire after datapath's flow_mutex. */
struct ovs_mutex mutex OVS_ACQ_AFTER(dp_netdev_mutex);
/* Statistics.
*
* Reading or writing these members requires 'mutex'. */
long long int used OVS_GUARDED; /* Last used time, in monotonic msecs. */
long long int packet_count OVS_GUARDED; /* Number of packets matched. */
long long int byte_count OVS_GUARDED; /* Number of bytes matched. */
uint16_t tcp_flags OVS_GUARDED; /* Bitwise-OR of seen tcp_flags values. */
/* Actions.
*
* Reading 'actions' requires 'mutex'.
* Writing 'actions' requires 'mutex' and (to allow for transactions) the
* datapath's flow_mutex. */
struct dp_netdev_actions *actions OVS_GUARDED;
};
static struct dp_netdev_flow *dp_netdev_flow_ref(
const struct dp_netdev_flow *);
static void dp_netdev_flow_unref(struct dp_netdev_flow *);
/* A set of datapath actions within a "struct dp_netdev_flow".
*
*
* Thread-safety
* =============
*
* A struct dp_netdev_actions 'actions' may be accessed without a risk of being
* freed by code that holds a read-lock or write-lock on 'flow->mutex' (where
* 'flow' is the dp_netdev_flow for which 'flow->actions == actions') or that
* owns a reference to 'actions->ref_cnt' (or both). */
struct dp_netdev_actions {
struct ovs_refcount ref_cnt;
/* These members are immutable: they do not change during the struct's
* lifetime. */
struct nlattr *actions; /* Sequence of OVS_ACTION_ATTR_* attributes. */
unsigned int size; /* Size of 'actions', in bytes. */
};
struct dp_netdev_actions *dp_netdev_actions_create(const struct nlattr *,
size_t);
struct dp_netdev_actions *dp_netdev_actions_ref(
const struct dp_netdev_actions *);
void dp_netdev_actions_unref(struct dp_netdev_actions *);
/* A thread that receives packets from some ports, looks them up in the flow
* table, and executes the actions it finds. */
struct dp_forwarder {
struct dp_netdev *dp;
pthread_t thread;
char *name;
uint32_t min_hash, max_hash;
};
/* Interface to netdev-based datapath. */
struct dpif_netdev {
struct dpif dpif;
struct dp_netdev *dp;
uint64_t last_port_seq;
};
static int get_port_by_number(struct dp_netdev *dp, odp_port_t port_no,
struct dp_netdev_port **portp)
OVS_REQ_RDLOCK(dp->port_rwlock);
static int get_port_by_name(struct dp_netdev *dp, const char *devname,
struct dp_netdev_port **portp)
OVS_REQ_RDLOCK(dp->port_rwlock);
static void dp_netdev_free(struct dp_netdev *)
OVS_REQUIRES(dp_netdev_mutex);
static void dp_netdev_flow_flush(struct dp_netdev *);
static int do_add_port(struct dp_netdev *dp, const char *devname,
const char *type, odp_port_t port_no)
OVS_REQ_WRLOCK(dp->port_rwlock);
static int do_del_port(struct dp_netdev *dp, odp_port_t port_no)
OVS_REQ_WRLOCK(dp->port_rwlock);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static int dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *,
int queue_no, const struct flow *,
const struct nlattr *userdata)
OVS_EXCLUDED(dp->queue_mutex);
static void dp_netdev_execute_actions(struct dp_netdev *dp,
const struct flow *, struct ofpbuf *,
struct pkt_metadata *,
const struct nlattr *actions,
size_t actions_len)
OVS_REQ_RDLOCK(dp->port_rwlock);
static void dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet,
struct pkt_metadata *)
OVS_REQ_RDLOCK(dp->port_rwlock);
static void dp_netdev_set_threads(struct dp_netdev *, int n);
static struct dpif_netdev *
dpif_netdev_cast(const struct dpif *dpif)
{
ovs_assert(dpif->dpif_class->open == dpif_netdev_open);
return CONTAINER_OF(dpif, struct dpif_netdev, dpif);
}
static struct dp_netdev *
get_dp_netdev(const struct dpif *dpif)
{
return dpif_netdev_cast(dpif)->dp;
}
static int
dpif_netdev_enumerate(struct sset *all_dps)
{
struct shash_node *node;
ovs_mutex_lock(&dp_netdev_mutex);
SHASH_FOR_EACH(node, &dp_netdevs) {
sset_add(all_dps, node->name);
}
ovs_mutex_unlock(&dp_netdev_mutex);
return 0;
}
static bool
dpif_netdev_class_is_dummy(const struct dpif_class *class)
{
return class != &dpif_netdev_class;
}
static const char *
dpif_netdev_port_open_type(const struct dpif_class *class, const char *type)
{
return strcmp(type, "internal") ? type
: dpif_netdev_class_is_dummy(class) ? "dummy"
: "tap";
}
static struct dpif *
create_dpif_netdev(struct dp_netdev *dp)
{
uint16_t netflow_id = hash_string(dp->name, 0);
struct dpif_netdev *dpif;
ovs_refcount_ref(&dp->ref_cnt);
dpif = xmalloc(sizeof *dpif);
dpif_init(&dpif->dpif, dp->class, dp->name, netflow_id >> 8, netflow_id);
dpif->dp = dp;
dpif->last_port_seq = seq_read(dp->port_seq);
return &dpif->dpif;
}
/* Choose an unused, non-zero port number and return it on success.
* Return ODPP_NONE on failure. */
static odp_port_t
choose_port(struct dp_netdev *dp, const char *name)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
uint32_t port_no;
if (dp->class != &dpif_netdev_class) {
const char *p;
int start_no = 0;
/* If the port name begins with "br", start the number search at
* 100 to make writing tests easier. */
if (!strncmp(name, "br", 2)) {
start_no = 100;
}
/* If the port name contains a number, try to assign that port number.
* This can make writing unit tests easier because port numbers are
* predictable. */
for (p = name; *p != '\0'; p++) {
if (isdigit((unsigned char) *p)) {
port_no = start_no + strtol(p, NULL, 10);
if (port_no > 0 && port_no != odp_to_u32(ODPP_NONE)
&& !dp_netdev_lookup_port(dp, u32_to_odp(port_no))) {
return u32_to_odp(port_no);
}
break;
}
}
}
for (port_no = 1; port_no <= UINT16_MAX; port_no++) {
if (!dp_netdev_lookup_port(dp, u32_to_odp(port_no))) {
return u32_to_odp(port_no);
}
}
return ODPP_NONE;
}
static int
create_dp_netdev(const char *name, const struct dpif_class *class,
struct dp_netdev **dpp)
OVS_REQUIRES(dp_netdev_mutex)
{
struct dp_netdev *dp;
int error;
int i;
dp = xzalloc(sizeof *dp);
shash_add(&dp_netdevs, name, dp);
*CONST_CAST(const struct dpif_class **, &dp->class) = class;
*CONST_CAST(const char **, &dp->name) = xstrdup(name);
ovs_refcount_init(&dp->ref_cnt);
atomic_flag_init(&dp->destroyed);
ovs_mutex_init(&dp->flow_mutex);
classifier_init(&dp->cls, NULL);
hmap_init(&dp->flow_table);
ovs_mutex_init(&dp->queue_mutex);
ovs_mutex_lock(&dp->queue_mutex);
for (i = 0; i < N_QUEUES; i++) {
dp->queues[i].head = dp->queues[i].tail = 0;
}
ovs_mutex_unlock(&dp->queue_mutex);
dp->queue_seq = seq_create();
dp->n_hit = ovsthread_counter_create();
dp->n_missed = ovsthread_counter_create();
dp->n_lost = ovsthread_counter_create();
ovs_rwlock_init(&dp->port_rwlock);
hmap_init(&dp->ports);
dp->port_seq = seq_create();
latch_init(&dp->exit_latch);
ovs_rwlock_wrlock(&dp->port_rwlock);
error = do_add_port(dp, name, "internal", ODPP_LOCAL);
ovs_rwlock_unlock(&dp->port_rwlock);
if (error) {
dp_netdev_free(dp);
return error;
}
dp_netdev_set_threads(dp, 2);
*dpp = dp;
return 0;
}
static int
dpif_netdev_open(const struct dpif_class *class, const char *name,
bool create, struct dpif **dpifp)
{
struct dp_netdev *dp;
int error;
ovs_mutex_lock(&dp_netdev_mutex);
dp = shash_find_data(&dp_netdevs, name);
if (!dp) {
error = create ? create_dp_netdev(name, class, &dp) : ENODEV;
} else {
error = (dp->class != class ? EINVAL
: create ? EEXIST
: 0);
}
if (!error) {
*dpifp = create_dpif_netdev(dp);
}
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static void
dp_netdev_purge_queues(struct dp_netdev *dp)
{
int i;
ovs_mutex_lock(&dp->queue_mutex);
for (i = 0; i < N_QUEUES; i++) {
struct dp_netdev_queue *q = &dp->queues[i];
while (q->tail != q->head) {
struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK];
ofpbuf_uninit(&u->upcall.packet);
ofpbuf_uninit(&u->buf);
}
}
ovs_mutex_unlock(&dp->queue_mutex);
}
/* Requires dp_netdev_mutex so that we can't get a new reference to 'dp'
* through the 'dp_netdevs' shash while freeing 'dp'. */
static void
dp_netdev_free(struct dp_netdev *dp)
OVS_REQUIRES(dp_netdev_mutex)
{
struct dp_netdev_port *port, *next;
shash_find_and_delete(&dp_netdevs, dp->name);
dp_netdev_set_threads(dp, 0);
free(dp->forwarders);
dp_netdev_flow_flush(dp);
ovs_rwlock_wrlock(&dp->port_rwlock);
HMAP_FOR_EACH_SAFE (port, next, node, &dp->ports) {
do_del_port(dp, port->port_no);
}
ovs_rwlock_unlock(&dp->port_rwlock);
ovsthread_counter_destroy(dp->n_hit);
ovsthread_counter_destroy(dp->n_missed);
ovsthread_counter_destroy(dp->n_lost);
dp_netdev_purge_queues(dp);
seq_destroy(dp->queue_seq);
ovs_mutex_destroy(&dp->queue_mutex);
classifier_destroy(&dp->cls);
hmap_destroy(&dp->flow_table);
ovs_mutex_destroy(&dp->flow_mutex);
seq_destroy(dp->port_seq);
hmap_destroy(&dp->ports);
atomic_flag_destroy(&dp->destroyed);
ovs_refcount_destroy(&dp->ref_cnt);
latch_destroy(&dp->exit_latch);
free(CONST_CAST(char *, dp->name));
free(dp);
}
static void
dp_netdev_unref(struct dp_netdev *dp)
{
if (dp) {
/* Take dp_netdev_mutex so that, if dp->ref_cnt falls to zero, we can't
* get a new reference to 'dp' through the 'dp_netdevs' shash. */
ovs_mutex_lock(&dp_netdev_mutex);
if (ovs_refcount_unref(&dp->ref_cnt) == 1) {
dp_netdev_free(dp);
}
ovs_mutex_unlock(&dp_netdev_mutex);
}
}
static void
dpif_netdev_close(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_unref(dp);
free(dpif);
}
static int
dpif_netdev_destroy(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
if (!atomic_flag_test_and_set(&dp->destroyed)) {
if (ovs_refcount_unref(&dp->ref_cnt) == 1) {
/* Can't happen: 'dpif' still owns a reference to 'dp'. */
OVS_NOT_REACHED();
}
}
return 0;
}
static int
dpif_netdev_get_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
fat_rwlock_rdlock(&dp->cls.rwlock);
stats->n_flows = hmap_count(&dp->flow_table);
fat_rwlock_unlock(&dp->cls.rwlock);
stats->n_hit = ovsthread_counter_read(dp->n_hit);
stats->n_missed = ovsthread_counter_read(dp->n_missed);
stats->n_lost = ovsthread_counter_read(dp->n_lost);
stats->n_masks = UINT32_MAX;
stats->n_mask_hit = UINT64_MAX;
return 0;
}
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
odp_port_t port_no)
OVS_REQ_WRLOCK(dp->port_rwlock)
{
struct netdev_saved_flags *sf;
struct dp_netdev_port *port;
struct netdev *netdev;
struct netdev_rx *rx;
enum netdev_flags flags;
const char *open_type;
int error;
/* XXX reject devices already in some dp_netdev. */
/* Open and validate network device. */
open_type = dpif_netdev_port_open_type(dp->class, type);
error = netdev_open(devname, open_type, &netdev);
if (error) {
return error;
}
/* XXX reject non-Ethernet devices */
netdev_get_flags(netdev, &flags);
if (flags & NETDEV_LOOPBACK) {
VLOG_ERR("%s: cannot add a loopback device", devname);
netdev_close(netdev);
return EINVAL;
}
error = netdev_rx_open(netdev, &rx);
if (error
&& !(error == EOPNOTSUPP && dpif_netdev_class_is_dummy(dp->class))) {
VLOG_ERR("%s: cannot receive packets on this network device (%s)",
devname, ovs_strerror(errno));
netdev_close(netdev);
return error;
}
error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, &sf);
if (error) {
netdev_rx_close(rx);
netdev_close(netdev);
return error;
}
port = xmalloc(sizeof *port);
port->port_no = port_no;
port->netdev = netdev;
port->sf = sf;
port->rx = rx;
port->type = xstrdup(type);
hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0));
seq_change(dp->port_seq);
return 0;
}
static int
dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
odp_port_t *port_nop)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
const char *dpif_port;
odp_port_t port_no;
int error;
ovs_rwlock_wrlock(&dp->port_rwlock);
dpif_port = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf);
if (*port_nop != ODPP_NONE) {
port_no = *port_nop;
error = dp_netdev_lookup_port(dp, *port_nop) ? EBUSY : 0;
} else {
port_no = choose_port(dp, dpif_port);
error = port_no == ODPP_NONE ? EFBIG : 0;
}
if (!error) {
*port_nop = port_no;
error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no);
}
ovs_rwlock_unlock(&dp->port_rwlock);
return error;
}
static int
dpif_netdev_port_del(struct dpif *dpif, odp_port_t port_no)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
int error;
ovs_rwlock_wrlock(&dp->port_rwlock);
error = port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no);
ovs_rwlock_unlock(&dp->port_rwlock);
return error;
}
static bool
is_valid_port_number(odp_port_t port_no)
{
return port_no != ODPP_NONE;
}
static struct dp_netdev_port *
dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t port_no)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
struct dp_netdev_port *port;
HMAP_FOR_EACH_IN_BUCKET (port, node, hash_int(odp_to_u32(port_no), 0),
&dp->ports) {
if (port->port_no == port_no) {
return port;
}
}
return NULL;
}
static int
get_port_by_number(struct dp_netdev *dp,
odp_port_t port_no, struct dp_netdev_port **portp)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
if (!is_valid_port_number(port_no)) {
*portp = NULL;
return EINVAL;
} else {
*portp = dp_netdev_lookup_port(dp, port_no);
return *portp ? 0 : ENOENT;
}
}
static int
get_port_by_name(struct dp_netdev *dp,
const char *devname, struct dp_netdev_port **portp)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
struct dp_netdev_port *port;
HMAP_FOR_EACH (port, node, &dp->ports) {
if (!strcmp(netdev_get_name(port->netdev), devname)) {
*portp = port;
return 0;
}
}
return ENOENT;
}
static int
do_del_port(struct dp_netdev *dp, odp_port_t port_no)
OVS_REQ_WRLOCK(dp->port_rwlock)
{
struct dp_netdev_port *port;
int error;
error = get_port_by_number(dp, port_no, &port);
if (error) {
return error;
}
hmap_remove(&dp->ports, &port->node);
seq_change(dp->port_seq);
netdev_close(port->netdev);
netdev_restore_flags(port->sf);
netdev_rx_close(port->rx);
free(port->type);
free(port);
return 0;
}
static void
answer_port_query(const struct dp_netdev_port *port,
struct dpif_port *dpif_port)
{
dpif_port->name = xstrdup(netdev_get_name(port->netdev));
dpif_port->type = xstrdup(port->type);
dpif_port->port_no = port->port_no;
}
static int
dpif_netdev_port_query_by_number(const struct dpif *dpif, odp_port_t port_no,
struct dpif_port *dpif_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
ovs_rwlock_rdlock(&dp->port_rwlock);
error = get_port_by_number(dp, port_no, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
ovs_rwlock_unlock(&dp->port_rwlock);
return error;
}
static int
dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname,
struct dpif_port *dpif_port)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_port *port;
int error;
ovs_rwlock_rdlock(&dp->port_rwlock);
error = get_port_by_name(dp, devname, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
ovs_rwlock_unlock(&dp->port_rwlock);
return error;
}
static void
dp_netdev_remove_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow)
OVS_REQ_WRLOCK(dp->cls.rwlock)
OVS_REQUIRES(dp->flow_mutex)
{
struct cls_rule *cr = CONST_CAST(struct cls_rule *, &flow->cr);
struct hmap_node *node = CONST_CAST(struct hmap_node *, &flow->node);
classifier_remove(&dp->cls, cr);
hmap_remove(&dp->flow_table, node);
dp_netdev_flow_unref(flow);
}
static struct dp_netdev_flow *
dp_netdev_flow_ref(const struct dp_netdev_flow *flow_)
{
struct dp_netdev_flow *flow = CONST_CAST(struct dp_netdev_flow *, flow_);
if (flow) {
ovs_refcount_ref(&flow->ref_cnt);
}
return flow;
}
static void
dp_netdev_flow_unref(struct dp_netdev_flow *flow)
{
if (flow && ovs_refcount_unref(&flow->ref_cnt) == 1) {
cls_rule_destroy(CONST_CAST(struct cls_rule *, &flow->cr));
ovs_mutex_lock(&flow->mutex);
dp_netdev_actions_unref(flow->actions);
ovs_refcount_destroy(&flow->ref_cnt);
ovs_mutex_unlock(&flow->mutex);
ovs_mutex_destroy(&flow->mutex);
free(flow);
}
}
static void
dp_netdev_flow_flush(struct dp_netdev *dp)
{
struct dp_netdev_flow *netdev_flow, *next;
ovs_mutex_lock(&dp->flow_mutex);
fat_rwlock_wrlock(&dp->cls.rwlock);
HMAP_FOR_EACH_SAFE (netdev_flow, next, node, &dp->flow_table) {
dp_netdev_remove_flow(dp, netdev_flow);
}
fat_rwlock_unlock(&dp->cls.rwlock);
ovs_mutex_unlock(&dp->flow_mutex);
}
static int
dpif_netdev_flow_flush(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_flow_flush(dp);
return 0;
}
struct dp_netdev_port_state {
uint32_t bucket;
uint32_t offset;
char *name;
};
static int
dpif_netdev_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct dp_netdev_port_state));
return 0;
}
static int
dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_,
struct dpif_port *dpif_port)
{
struct dp_netdev_port_state *state = state_;
struct dp_netdev *dp = get_dp_netdev(dpif);
struct hmap_node *node;
int retval;
ovs_rwlock_rdlock(&dp->port_rwlock);
node = hmap_at_position(&dp->ports, &state->bucket, &state->offset);
if (node) {
struct dp_netdev_port *port;
port = CONTAINER_OF(node, struct dp_netdev_port, node);
free(state->name);
state->name = xstrdup(netdev_get_name(port->netdev));
dpif_port->name = state->name;
dpif_port->type = port->type;
dpif_port->port_no = port->port_no;
retval = 0;
} else {
retval = EOF;
}
ovs_rwlock_unlock(&dp->port_rwlock);
return retval;
}
static int
dpif_netdev_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dp_netdev_port_state *state = state_;
free(state->name);
free(state);
return 0;
}
static int
dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
uint64_t new_port_seq;
int error;
new_port_seq = seq_read(dpif->dp->port_seq);
if (dpif->last_port_seq != new_port_seq) {
dpif->last_port_seq = new_port_seq;
error = ENOBUFS;
} else {
error = EAGAIN;
}
return error;
}
static void
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
seq_wait(dpif->dp->port_seq, dpif->last_port_seq);
}
static struct dp_netdev_flow *
dp_netdev_flow_cast(const struct cls_rule *cr)
{
return cr ? CONTAINER_OF(cr, struct dp_netdev_flow, cr) : NULL;
}
static struct dp_netdev_flow *
dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct flow *flow)
OVS_EXCLUDED(dp->cls.rwlock)
{
struct dp_netdev_flow *netdev_flow;
fat_rwlock_rdlock(&dp->cls.rwlock);
netdev_flow = dp_netdev_flow_cast(classifier_lookup(&dp->cls, flow, NULL));
dp_netdev_flow_ref(netdev_flow);
fat_rwlock_unlock(&dp->cls.rwlock);
return netdev_flow;
}
static struct dp_netdev_flow *
dp_netdev_find_flow(const struct dp_netdev *dp, const struct flow *flow)
OVS_REQ_RDLOCK(dp->cls.rwlock)
{
struct dp_netdev_flow *netdev_flow;
HMAP_FOR_EACH_WITH_HASH (netdev_flow, node, flow_hash(flow, 0),
&dp->flow_table) {
if (flow_equal(&netdev_flow->flow, flow)) {
return dp_netdev_flow_ref(netdev_flow);
}
}
return NULL;
}
static void
get_dpif_flow_stats(struct dp_netdev_flow *netdev_flow,
struct dpif_flow_stats *stats)
OVS_REQ_RDLOCK(netdev_flow->mutex)
{
stats->n_packets = netdev_flow->packet_count;
stats->n_bytes = netdev_flow->byte_count;
stats->used = netdev_flow->used;
stats->tcp_flags = netdev_flow->tcp_flags;
}
static int
dpif_netdev_mask_from_nlattrs(const struct nlattr *key, uint32_t key_len,
const struct nlattr *mask_key,
uint32_t mask_key_len, const struct flow *flow,
struct flow *mask)
{
if (mask_key_len) {
enum odp_key_fitness fitness;
fitness = odp_flow_key_to_mask(mask_key, mask_key_len, mask, flow);
if (fitness) {
/* This should not happen: it indicates that
* odp_flow_key_from_mask() and odp_flow_key_to_mask()
* disagree on the acceptable form of a mask. Log the problem
* as an error, with enough details to enable debugging. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
if (!VLOG_DROP_ERR(&rl)) {
struct ds s;
ds_init(&s);
odp_flow_format(key, key_len, mask_key, mask_key_len, NULL, &s,
true);
VLOG_ERR("internal error parsing flow mask %s (%s)",
ds_cstr(&s), odp_key_fitness_to_string(fitness));
ds_destroy(&s);
}
return EINVAL;
}
/* Force unwildcard the in_port. */
mask->in_port.odp_port = u32_to_odp(UINT32_MAX);
} else {
enum mf_field_id id;
/* No mask key, unwildcard everything except fields whose
* prerequisities are not met. */
memset(mask, 0x0, sizeof *mask);
for (id = 0; id < MFF_N_IDS; ++id) {
/* Skip registers and metadata. */
if (!(id >= MFF_REG0 && id < MFF_REG0 + FLOW_N_REGS)
&& id != MFF_METADATA) {
const struct mf_field *mf = mf_from_id(id);
if (mf_are_prereqs_ok(mf, flow)) {
mf_mask_field(mf, mask);
}
}
}
}
return 0;
}
static int
dpif_netdev_flow_from_nlattrs(const struct nlattr *key, uint32_t key_len,
struct flow *flow)
{
odp_port_t in_port;
if (odp_flow_key_to_flow(key, key_len, flow)) {
/* This should not happen: it indicates that odp_flow_key_from_flow()
* and odp_flow_key_to_flow() disagree on the acceptable form of a
* flow. Log the problem as an error, with enough details to enable
* debugging. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
if (!VLOG_DROP_ERR(&rl)) {
struct ds s;
ds_init(&s);
odp_flow_format(key, key_len, NULL, 0, NULL, &s, true);
VLOG_ERR("internal error parsing flow key %s", ds_cstr(&s));
ds_destroy(&s);
}
return EINVAL;
}
in_port = flow->in_port.odp_port;
if (!is_valid_port_number(in_port) && in_port != ODPP_NONE) {
return EINVAL;
}
return 0;
}
static int
dpif_netdev_flow_get(const struct dpif *dpif,
const struct nlattr *nl_key, size_t nl_key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct flow key;
int error;
error = dpif_netdev_flow_from_nlattrs(nl_key, nl_key_len, &key);
if (error) {
return error;
}
fat_rwlock_rdlock(&dp->cls.rwlock);
netdev_flow = dp_netdev_find_flow(dp, &key);
fat_rwlock_unlock(&dp->cls.rwlock);
if (netdev_flow) {
struct dp_netdev_actions *actions = NULL;
ovs_mutex_lock(&netdev_flow->mutex);
if (stats) {
get_dpif_flow_stats(netdev_flow, stats);
}
if (actionsp) {
actions = dp_netdev_actions_ref(netdev_flow->actions);
}
ovs_mutex_unlock(&netdev_flow->mutex);
dp_netdev_flow_unref(netdev_flow);
if (actionsp) {
*actionsp = ofpbuf_clone_data(actions->actions, actions->size);
dp_netdev_actions_unref(actions);
}
} else {
error = ENOENT;
}
return error;
}
static int
dp_netdev_flow_add(struct dp_netdev *dp, const struct flow *flow,
const struct flow_wildcards *wc,
const struct nlattr *actions,
size_t actions_len)
OVS_REQUIRES(dp->flow_mutex)
{
struct dp_netdev_flow *netdev_flow;
struct match match;
netdev_flow = xzalloc(sizeof *netdev_flow);
*CONST_CAST(struct flow *, &netdev_flow->flow) = *flow;
ovs_refcount_init(&netdev_flow->ref_cnt);
ovs_mutex_init(&netdev_flow->mutex);
ovs_mutex_lock(&netdev_flow->mutex);
netdev_flow->actions = dp_netdev_actions_create(actions, actions_len);
match_init(&match, flow, wc);
cls_rule_init(CONST_CAST(struct cls_rule *, &netdev_flow->cr),
&match, NETDEV_RULE_PRIORITY);
fat_rwlock_wrlock(&dp->cls.rwlock);
classifier_insert(&dp->cls,
CONST_CAST(struct cls_rule *, &netdev_flow->cr));
hmap_insert(&dp->flow_table,
CONST_CAST(struct hmap_node *, &netdev_flow->node),
flow_hash(flow, 0));
fat_rwlock_unlock(&dp->cls.rwlock);
ovs_mutex_unlock(&netdev_flow->mutex);
return 0;
}
static void
clear_stats(struct dp_netdev_flow *netdev_flow)
OVS_REQUIRES(netdev_flow->mutex)
{
netdev_flow->used = 0;
netdev_flow->packet_count = 0;
netdev_flow->byte_count = 0;
netdev_flow->tcp_flags = 0;
}
static int
dpif_netdev_flow_put(struct dpif *dpif, const struct dpif_flow_put *put)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct flow flow;
struct flow_wildcards wc;
int error;
error = dpif_netdev_flow_from_nlattrs(put->key, put->key_len, &flow);
if (error) {
return error;
}
error = dpif_netdev_mask_from_nlattrs(put->key, put->key_len,
put->mask, put->mask_len,
&flow, &wc.masks);
if (error) {
return error;
}
ovs_mutex_lock(&dp->flow_mutex);
netdev_flow = dp_netdev_lookup_flow(dp, &flow);
if (!netdev_flow) {
if (put->flags & DPIF_FP_CREATE) {
if (hmap_count(&dp->flow_table) < MAX_FLOWS) {
if (put->stats) {
memset(put->stats, 0, sizeof *put->stats);
}
error = dp_netdev_flow_add(dp, &flow, &wc, put->actions,
put->actions_len);
} else {
error = EFBIG;
}
} else {
error = ENOENT;
}
} else {
if (put->flags & DPIF_FP_MODIFY
&& flow_equal(&flow, &netdev_flow->flow)) {
struct dp_netdev_actions *new_actions;
struct dp_netdev_actions *old_actions;
new_actions = dp_netdev_actions_create(put->actions,
put->actions_len);
ovs_mutex_lock(&netdev_flow->mutex);
old_actions = netdev_flow->actions;
netdev_flow->actions = new_actions;
if (put->stats) {
get_dpif_flow_stats(netdev_flow, put->stats);
}
if (put->flags & DPIF_FP_ZERO_STATS) {
clear_stats(netdev_flow);
}
ovs_mutex_unlock(&netdev_flow->mutex);
dp_netdev_actions_unref(old_actions);
} else if (put->flags & DPIF_FP_CREATE) {
error = EEXIST;
} else {
/* Overlapping flow. */
error = EINVAL;
}
dp_netdev_flow_unref(netdev_flow);
}
ovs_mutex_unlock(&dp->flow_mutex);
return error;
}
static int
dpif_netdev_flow_del(struct dpif *dpif, const struct dpif_flow_del *del)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct flow key;
int error;
error = dpif_netdev_flow_from_nlattrs(del->key, del->key_len, &key);
if (error) {
return error;
}
ovs_mutex_lock(&dp->flow_mutex);
fat_rwlock_wrlock(&dp->cls.rwlock);
netdev_flow = dp_netdev_find_flow(dp, &key);
if (netdev_flow) {
if (del->stats) {
ovs_mutex_lock(&netdev_flow->mutex);
get_dpif_flow_stats(netdev_flow, del->stats);
ovs_mutex_unlock(&netdev_flow->mutex);
}
dp_netdev_remove_flow(dp, netdev_flow);
dp_netdev_flow_unref(netdev_flow);
} else {
error = ENOENT;
}
fat_rwlock_unlock(&dp->cls.rwlock);
ovs_mutex_unlock(&dp->flow_mutex);
return error;
}
struct dp_netdev_flow_state {
uint32_t bucket;
uint32_t offset;
struct dp_netdev_actions *actions;
struct odputil_keybuf keybuf;
struct odputil_keybuf maskbuf;
struct dpif_flow_stats stats;
};
static int
dpif_netdev_flow_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
struct dp_netdev_flow_state *state;
*statep = state = xmalloc(sizeof *state);
state->bucket = 0;
state->offset = 0;
state->actions = NULL;
return 0;
}
static int
dpif_netdev_flow_dump_next(const struct dpif *dpif, void *state_,
const struct nlattr **key, size_t *key_len,
const struct nlattr **mask, size_t *mask_len,
const struct nlattr **actions, size_t *actions_len,
const struct dpif_flow_stats **stats)
{
struct dp_netdev_flow_state *state = state_;
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct hmap_node *node;
fat_rwlock_rdlock(&dp->cls.rwlock);
node = hmap_at_position(&dp->flow_table, &state->bucket, &state->offset);
if (node) {
netdev_flow = CONTAINER_OF(node, struct dp_netdev_flow, node);
dp_netdev_flow_ref(netdev_flow);
}
fat_rwlock_unlock(&dp->cls.rwlock);
if (!node) {
return EOF;
}
if (key) {
struct ofpbuf buf;
ofpbuf_use_stack(&buf, &state->keybuf, sizeof state->keybuf);
odp_flow_key_from_flow(&buf, &netdev_flow->flow,
netdev_flow->flow.in_port.odp_port);
*key = buf.data;
*key_len = buf.size;
}
if (key && mask) {
struct ofpbuf buf;
struct flow_wildcards wc;
ofpbuf_use_stack(&buf, &state->maskbuf, sizeof state->maskbuf);
minimask_expand(&netdev_flow->cr.match.mask, &wc);
odp_flow_key_from_mask(&buf, &wc.masks, &netdev_flow->flow,
odp_to_u32(wc.masks.in_port.odp_port),
SIZE_MAX);
*mask = buf.data;
*mask_len = buf.size;
}
if (actions || stats) {
dp_netdev_actions_unref(state->actions);
state->actions = NULL;
ovs_mutex_lock(&netdev_flow->mutex);
if (actions) {
state->actions = dp_netdev_actions_ref(netdev_flow->actions);
*actions = state->actions->actions;
*actions_len = state->actions->size;
}
if (stats) {
get_dpif_flow_stats(netdev_flow, &state->stats);
*stats = &state->stats;
}
ovs_mutex_unlock(&netdev_flow->mutex);
}
dp_netdev_flow_unref(netdev_flow);
return 0;
}
static int
dpif_netdev_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dp_netdev_flow_state *state = state_;
dp_netdev_actions_unref(state->actions);
free(state);
return 0;
}
static int
dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct pkt_metadata *md = &execute->md;
struct flow key;
if (execute->packet->size < ETH_HEADER_LEN ||
execute->packet->size > UINT16_MAX) {
return EINVAL;
}
/* Extract flow key. */
flow_extract(execute->packet, md->skb_priority, md->pkt_mark, &md->tunnel,
(union flow_in_port *)&md->in_port, &key);
ovs_rwlock_rdlock(&dp->port_rwlock);
dp_netdev_execute_actions(dp, &key, execute->packet, md, execute->actions,
execute->actions_len);
ovs_rwlock_unlock(&dp->port_rwlock);
return 0;
}
static int
dpif_netdev_recv_set(struct dpif *dpif OVS_UNUSED, bool enable OVS_UNUSED)
{
return 0;
}
static int
dpif_netdev_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
uint32_t queue_id, uint32_t *priority)
{
*priority = queue_id;
return 0;
}
static struct dp_netdev_queue *
find_nonempty_queue(struct dp_netdev *dp)
OVS_REQUIRES(dp->queue_mutex)
{
int i;
for (i = 0; i < N_QUEUES; i++) {
struct dp_netdev_queue *q = &dp->queues[i];
if (q->head != q->tail) {
return q;
}
}
return NULL;
}
static int
dpif_netdev_recv(struct dpif *dpif, struct dpif_upcall *upcall,
struct ofpbuf *buf)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_queue *q;
int error;
ovs_mutex_lock(&dp->queue_mutex);
q = find_nonempty_queue(dp);
if (q) {
struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK];
*upcall = u->upcall;
ofpbuf_uninit(buf);
*buf = u->buf;
error = 0;
} else {
error = EAGAIN;
}
ovs_mutex_unlock(&dp->queue_mutex);
return error;
}
static void
dpif_netdev_recv_wait(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
uint64_t seq;
ovs_mutex_lock(&dp->queue_mutex);
seq = seq_read(dp->queue_seq);
if (find_nonempty_queue(dp)) {
poll_immediate_wake();
} else {
seq_wait(dp->queue_seq, seq);
}
ovs_mutex_unlock(&dp->queue_mutex);
}
static void
dpif_netdev_recv_purge(struct dpif *dpif)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
dp_netdev_purge_queues(dpif_netdev->dp);
}
/* Creates and returns a new 'struct dp_netdev_actions', with a reference count
* of 1, whose actions are a copy of from the 'ofpacts_len' bytes of
* 'ofpacts'. */
struct dp_netdev_actions *
dp_netdev_actions_create(const struct nlattr *actions, size_t size)
{
struct dp_netdev_actions *netdev_actions;
netdev_actions = xmalloc(sizeof *netdev_actions);
ovs_refcount_init(&netdev_actions->ref_cnt);
netdev_actions->actions = xmemdup(actions, size);
netdev_actions->size = size;
return netdev_actions;
}
/* Increments 'actions''s refcount. */
struct dp_netdev_actions *
dp_netdev_actions_ref(const struct dp_netdev_actions *actions_)
{
struct dp_netdev_actions *actions;
actions = CONST_CAST(struct dp_netdev_actions *, actions_);
if (actions) {
ovs_refcount_ref(&actions->ref_cnt);
}
return actions;
}
/* Decrements 'actions''s refcount and frees 'actions' if the refcount reaches
* 0. */
void
dp_netdev_actions_unref(struct dp_netdev_actions *actions)
{
if (actions && ovs_refcount_unref(&actions->ref_cnt) == 1) {
ovs_refcount_destroy(&actions->ref_cnt);
free(actions->actions);
free(actions);
}
}
static void *
dp_forwarder_main(void *f_)
{
struct dp_forwarder *f = f_;
struct dp_netdev *dp = f->dp;
struct ofpbuf packet;
f->name = xasprintf("forwarder_%u", ovsthread_id_self());
set_subprogram_name("%s", f->name);
ofpbuf_init(&packet, 0);
while (!latch_is_set(&dp->exit_latch)) {
bool received_anything;
int i;
ovs_rwlock_rdlock(&dp->port_rwlock);
for (i = 0; i < 50; i++) {
struct dp_netdev_port *port;
received_anything = false;
HMAP_FOR_EACH (port, node, &f->dp->ports) {
if (port->rx
&& port->node.hash >= f->min_hash
&& port->node.hash <= f->max_hash) {
int buf_size;
int error;
int mtu;
if (netdev_get_mtu(port->netdev, &mtu)) {
mtu = ETH_PAYLOAD_MAX;
}
buf_size = DP_NETDEV_HEADROOM + VLAN_ETH_HEADER_LEN + mtu;
ofpbuf_clear(&packet);
ofpbuf_reserve_with_tailroom(&packet, DP_NETDEV_HEADROOM,
buf_size);
error = netdev_rx_recv(port->rx, &packet);
if (!error) {
struct pkt_metadata md
= PKT_METADATA_INITIALIZER(port->port_no);
dp_netdev_port_input(dp, &packet, &md);
received_anything = true;
} else if (error != EAGAIN && error != EOPNOTSUPP) {
static struct vlog_rate_limit rl
= VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
netdev_get_name(port->netdev),
ovs_strerror(error));
}
}
}
if (!received_anything) {
break;
}
}
if (received_anything) {
poll_immediate_wake();
} else {
struct dp_netdev_port *port;
HMAP_FOR_EACH (port, node, &f->dp->ports)
if (port->rx
&& port->node.hash >= f->min_hash
&& port->node.hash <= f->max_hash) {
netdev_rx_wait(port->rx);
}
seq_wait(dp->port_seq, seq_read(dp->port_seq));
latch_wait(&dp->exit_latch);
}
ovs_rwlock_unlock(&dp->port_rwlock);
poll_block();
}
ofpbuf_uninit(&packet);
free(f->name);
return NULL;
}
static void
dp_netdev_set_threads(struct dp_netdev *dp, int n)
{
int i;
if (n == dp->n_forwarders) {
return;
}
/* Stop existing threads. */
latch_set(&dp->exit_latch);
for (i = 0; i < dp->n_forwarders; i++) {
struct dp_forwarder *f = &dp->forwarders[i];
xpthread_join(f->thread, NULL);
}
latch_poll(&dp->exit_latch);
free(dp->forwarders);
/* Start new threads. */
dp->forwarders = xmalloc(n * sizeof *dp->forwarders);
dp->n_forwarders = n;
for (i = 0; i < n; i++) {
struct dp_forwarder *f = &dp->forwarders[i];
f->dp = dp;
f->min_hash = UINT32_MAX / n * i;
f->max_hash = UINT32_MAX / n * (i + 1) - 1;
if (i == n - 1) {
f->max_hash = UINT32_MAX;
}
xpthread_create(&f->thread, NULL, dp_forwarder_main, f);
}
}
static void
dp_netdev_flow_used(struct dp_netdev_flow *netdev_flow,
const struct ofpbuf *packet)
OVS_REQUIRES(netdev_flow->mutex)
{
netdev_flow->used = time_msec();
netdev_flow->packet_count++;
netdev_flow->byte_count += packet->size;
netdev_flow->tcp_flags |= packet_get_tcp_flags(packet, &netdev_flow->flow);
}
static void
dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet,
struct pkt_metadata *md)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
struct dp_netdev_flow *netdev_flow;
struct flow key;
if (packet->size < ETH_HEADER_LEN) {
return;
}
flow_extract(packet, md->skb_priority, md->pkt_mark, &md->tunnel,
(union flow_in_port *)&md->in_port, &key);
netdev_flow = dp_netdev_lookup_flow(dp, &key);
if (netdev_flow) {
struct dp_netdev_actions *actions;
ovs_mutex_lock(&netdev_flow->mutex);
dp_netdev_flow_used(netdev_flow, packet);
actions = dp_netdev_actions_ref(netdev_flow->actions);
ovs_mutex_unlock(&netdev_flow->mutex);
dp_netdev_execute_actions(dp, &key, packet, md,
actions->actions, actions->size);
dp_netdev_actions_unref(actions);
dp_netdev_flow_unref(netdev_flow);
ovsthread_counter_inc(dp->n_hit, 1);
} else {
ovsthread_counter_inc(dp->n_missed, 1);
dp_netdev_output_userspace(dp, packet, DPIF_UC_MISS, &key, NULL);
}
}
static int
dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *packet,
int queue_no, const struct flow *flow,
const struct nlattr *userdata)
OVS_EXCLUDED(dp->queue_mutex)
{
struct dp_netdev_queue *q = &dp->queues[queue_no];
int error;
ovs_mutex_lock(&dp->queue_mutex);
if (q->head - q->tail < MAX_QUEUE_LEN) {
struct dp_netdev_upcall *u = &q->upcalls[q->head++ & QUEUE_MASK];
struct dpif_upcall *upcall = &u->upcall;
struct ofpbuf *buf = &u->buf;
size_t buf_size;
upcall->type = queue_no;
/* Allocate buffer big enough for everything. */
buf_size = ODPUTIL_FLOW_KEY_BYTES;
if (userdata) {
buf_size += NLA_ALIGN(userdata->nla_len);
}
ofpbuf_init(buf, buf_size);
/* Put ODP flow. */
odp_flow_key_from_flow(buf, flow, flow->in_port.odp_port);
upcall->key = buf->data;
upcall->key_len = buf->size;
/* Put userdata. */
if (userdata) {
upcall->userdata = ofpbuf_put(buf, userdata,
NLA_ALIGN(userdata->nla_len));
}
/* Steal packet data. */
ovs_assert(packet->source == OFPBUF_MALLOC);
upcall->packet = *packet;
ofpbuf_use(packet, NULL, 0);
seq_change(dp->queue_seq);
error = 0;
} else {
ovsthread_counter_inc(dp->n_lost, 1);
error = ENOBUFS;
}
ovs_mutex_unlock(&dp->queue_mutex);
return error;
}
struct dp_netdev_execute_aux {
struct dp_netdev *dp;
const struct flow *key;
};
static void
dp_execute_cb(void *aux_, struct ofpbuf *packet,
const struct pkt_metadata *md OVS_UNUSED,
const struct nlattr *a, bool may_steal)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
struct dp_netdev_execute_aux *aux = aux_;
int type = nl_attr_type(a);
struct dp_netdev_port *p;
switch ((enum ovs_action_attr)type) {
case OVS_ACTION_ATTR_OUTPUT:
p = dp_netdev_lookup_port(aux->dp, u32_to_odp(nl_attr_get_u32(a)));
if (p) {
netdev_send(p->netdev, packet);
}
break;
case OVS_ACTION_ATTR_USERSPACE: {
const struct nlattr *userdata;
userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA);
/* Make a copy if we are not allowed to steal the packet's data. */
if (!may_steal) {
packet = ofpbuf_clone_with_headroom(packet, DP_NETDEV_HEADROOM);
}
dp_netdev_output_userspace(aux->dp, packet, DPIF_UC_ACTION, aux->key,
userdata);
if (!may_steal) {
ofpbuf_uninit(packet);
}
break;
}
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_PUSH_MPLS:
case OVS_ACTION_ATTR_POP_MPLS:
case OVS_ACTION_ATTR_SET:
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
}
static void
dp_netdev_execute_actions(struct dp_netdev *dp, const struct flow *key,
struct ofpbuf *packet, struct pkt_metadata *md,
const struct nlattr *actions, size_t actions_len)
OVS_REQ_RDLOCK(dp->port_rwlock)
{
struct dp_netdev_execute_aux aux = {dp, key};
odp_execute_actions(&aux, packet, md, actions, actions_len, dp_execute_cb);
}
const struct dpif_class dpif_netdev_class = {
"netdev",
dpif_netdev_enumerate,
dpif_netdev_port_open_type,
dpif_netdev_open,
dpif_netdev_close,
dpif_netdev_destroy,
NULL, /* run */
NULL, /* wait */
dpif_netdev_get_stats,
dpif_netdev_port_add,
dpif_netdev_port_del,
dpif_netdev_port_query_by_number,
dpif_netdev_port_query_by_name,
NULL, /* port_get_pid */
dpif_netdev_port_dump_start,
dpif_netdev_port_dump_next,
dpif_netdev_port_dump_done,
dpif_netdev_port_poll,
dpif_netdev_port_poll_wait,
dpif_netdev_flow_get,
dpif_netdev_flow_put,
dpif_netdev_flow_del,
dpif_netdev_flow_flush,
dpif_netdev_flow_dump_start,
dpif_netdev_flow_dump_next,
dpif_netdev_flow_dump_done,
dpif_netdev_execute,
NULL, /* operate */
dpif_netdev_recv_set,
dpif_netdev_queue_to_priority,
dpif_netdev_recv,
dpif_netdev_recv_wait,
dpif_netdev_recv_purge,
};
static void
dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[], void *aux OVS_UNUSED)
{
struct dp_netdev_port *port;
struct dp_netdev *dp;
odp_port_t port_no;
ovs_mutex_lock(&dp_netdev_mutex);
dp = shash_find_data(&dp_netdevs, argv[1]);
if (!dp || !dpif_netdev_class_is_dummy(dp->class)) {
ovs_mutex_unlock(&dp_netdev_mutex);
unixctl_command_reply_error(conn, "unknown datapath or not a dummy");
return;
}
ovs_refcount_ref(&dp->ref_cnt);
ovs_mutex_unlock(&dp_netdev_mutex);
ovs_rwlock_wrlock(&dp->port_rwlock);
if (get_port_by_name(dp, argv[2], &port)) {
unixctl_command_reply_error(conn, "unknown port");
goto exit;
}
port_no = u32_to_odp(atoi(argv[3]));
if (!port_no || port_no == ODPP_NONE) {
unixctl_command_reply_error(conn, "bad port number");
goto exit;
}
if (dp_netdev_lookup_port(dp, port_no)) {
unixctl_command_reply_error(conn, "port number already in use");
goto exit;
}
hmap_remove(&dp->ports, &port->node);
port->port_no = port_no;
hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0));
seq_change(dp->port_seq);
unixctl_command_reply(conn, NULL);
exit:
ovs_rwlock_unlock(&dp->port_rwlock);
dp_netdev_unref(dp);
}
static void
dpif_dummy_register__(const char *type)
{
struct dpif_class *class;
class = xmalloc(sizeof *class);
*class = dpif_netdev_class;
class->type = xstrdup(type);
dp_register_provider(class);
}
void
dpif_dummy_register(bool override)
{
if (override) {
struct sset types;
const char *type;
sset_init(&types);
dp_enumerate_types(&types);
SSET_FOR_EACH (type, &types) {
if (!dp_unregister_provider(type)) {
dpif_dummy_register__(type);
}
}
sset_destroy(&types);
}
dpif_dummy_register__("dummy");
unixctl_command_register("dpif-dummy/change-port-number",
"DP PORT NEW-NUMBER",
3, 3, dpif_dummy_change_port_number, NULL);
}
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