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dpif-netdev.c
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dpif-netdev.c
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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013 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 "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_PORTS = 256 }; /* Maximum number of ports. */
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));
struct dp_netdev_upcall {
struct dpif_upcall upcall; /* Queued upcall information. */
struct ofpbuf buf; /* ofpbuf instance for upcall.packet. */
};
struct dp_netdev_queue {
struct dp_netdev_upcall upcalls[MAX_QUEUE_LEN];
unsigned int head, tail;
};
/* Datapath based on the network device interface from netdev.h. */
struct dp_netdev {
const struct dpif_class *class;
char *name;
int open_cnt;
bool destroyed;
int max_mtu; /* Maximum MTU of any port added so far. */
struct dp_netdev_queue queues[N_QUEUES];
struct classifier cls; /* Classifier. */
struct hmap flow_table; /* Flow table. */
struct seq *queue_seq; /* Incremented whenever a packet is queued. */
/* Statistics. */
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. */
struct dp_netdev_port *ports[MAX_PORTS];
struct list port_list;
struct seq *port_seq; /* Incremented whenever a port changes. */
};
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
odp_port_t port_no; /* Index into dp_netdev's 'ports'. */
struct list node; /* Element in dp_netdev's 'port_list'. */
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'. */
struct dp_netdev_flow {
/* Packet classification. */
struct cls_rule cr; /* In owning dp_netdev's 'cls'. */
/* Hash table index by unmasked flow.*/
struct hmap_node node; /* In owning dp_netdev's 'flow_table'. */
struct flow flow; /* The flow that created this entry. */
/* Statistics. */
long long int used; /* Last used time, in monotonic msecs. */
long long int packet_count; /* Number of packets matched. */
long long int byte_count; /* Number of bytes matched. */
uint16_t tcp_flags; /* Bitwise-OR of seen tcp_flags values. */
/* Actions. */
struct nlattr *actions;
size_t actions_len;
};
/* Interface to netdev-based datapath. */
struct dpif_netdev {
struct dpif dpif;
struct dp_netdev *dp;
uint64_t last_port_seq;
};
/* All netdev-based datapaths. */
static struct shash dp_netdevs = SHASH_INITIALIZER(&dp_netdevs);
/* Global lock for all data. */
static struct ovs_mutex dp_netdev_mutex = OVS_MUTEX_INITIALIZER;
static int get_port_by_number(struct dp_netdev *, odp_port_t port_no,
struct dp_netdev_port **portp);
static int get_port_by_name(struct dp_netdev *, const char *devname,
struct dp_netdev_port **portp);
static void dp_netdev_free(struct dp_netdev *);
static void dp_netdev_flow_flush(struct dp_netdev *);
static int do_add_port(struct dp_netdev *, const char *devname,
const char *type, odp_port_t port_no);
static int do_del_port(struct dp_netdev *, odp_port_t port_no);
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 *, struct ofpbuf *,
int queue_no, const struct flow *,
const struct nlattr *userdata);
static void dp_netdev_execute_actions(struct dp_netdev *, const struct flow *,
struct ofpbuf *, struct pkt_metadata *,
const struct nlattr *actions,
size_t actions_len);
static void dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet,
struct pkt_metadata *md);
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;
dp->open_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)
{
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 < MAX_PORTS
&& !dp->ports[port_no]) {
return u32_to_odp(port_no);
}
break;
}
}
}
for (port_no = 1; port_no < MAX_PORTS; port_no++) {
if (!dp->ports[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)
{
struct dp_netdev *dp;
int error;
int i;
dp = xzalloc(sizeof *dp);
dp->class = class;
dp->name = xstrdup(name);
dp->open_cnt = 0;
dp->max_mtu = ETH_PAYLOAD_MAX;
for (i = 0; i < N_QUEUES; i++) {
dp->queues[i].head = dp->queues[i].tail = 0;
}
dp->queue_seq = seq_create();
classifier_init(&dp->cls, NULL);
hmap_init(&dp->flow_table);
dp->n_hit = ovsthread_counter_create();
dp->n_missed = ovsthread_counter_create();
dp->n_lost = ovsthread_counter_create();
list_init(&dp->port_list);
dp->port_seq = seq_create();
error = do_add_port(dp, name, "internal", ODPP_LOCAL);
if (error) {
dp_netdev_free(dp);
return error;
}
shash_add(&dp_netdevs, name, dp);
*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;
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);
}
}
}
static void
dp_netdev_free(struct dp_netdev *dp)
{
struct dp_netdev_port *port, *next;
dp_netdev_flow_flush(dp);
LIST_FOR_EACH_SAFE (port, next, node, &dp->port_list) {
do_del_port(dp, port->port_no);
}
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);
classifier_destroy(&dp->cls);
hmap_destroy(&dp->flow_table);
seq_destroy(dp->port_seq);
free(dp->name);
free(dp);
}
static void
dpif_netdev_close(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
ovs_mutex_lock(&dp_netdev_mutex);
ovs_assert(dp->open_cnt > 0);
if (--dp->open_cnt == 0 && dp->destroyed) {
shash_find_and_delete(&dp_netdevs, dp->name);
dp_netdev_free(dp);
}
free(dpif);
ovs_mutex_unlock(&dp_netdev_mutex);
}
static int
dpif_netdev_destroy(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
ovs_mutex_lock(&dp_netdev_mutex);
dp->destroyed = true;
ovs_mutex_unlock(&dp_netdev_mutex);
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);
ovs_mutex_lock(&dp_netdev_mutex);
stats->n_flows = hmap_count(&dp->flow_table);
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;
ovs_mutex_unlock(&dp_netdev_mutex);
return 0;
}
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
odp_port_t port_no)
{
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 mtu;
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);
error = netdev_get_mtu(netdev, &mtu);
if (!error && mtu > dp->max_mtu) {
dp->max_mtu = mtu;
}
list_push_back(&dp->port_list, &port->node);
dp->ports[odp_to_u32(port_no)] = port;
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_mutex_lock(&dp_netdev_mutex);
dpif_port = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf);
if (*port_nop != ODPP_NONE) {
uint32_t port_idx = odp_to_u32(*port_nop);
if (port_idx >= MAX_PORTS) {
error = EFBIG;
} else if (dp->ports[port_idx]) {
error = EBUSY;
} else {
error = 0;
port_no = *port_nop;
}
} 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_mutex_unlock(&dp_netdev_mutex);
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_mutex_lock(&dp_netdev_mutex);
error = port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no);
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static bool
is_valid_port_number(odp_port_t port_no)
{
return odp_to_u32(port_no) < MAX_PORTS;
}
static int
get_port_by_number(struct dp_netdev *dp,
odp_port_t port_no, struct dp_netdev_port **portp)
{
if (!is_valid_port_number(port_no)) {
*portp = NULL;
return EINVAL;
} else {
*portp = dp->ports[odp_to_u32(port_no)];
return *portp ? 0 : ENOENT;
}
}
static int
get_port_by_name(struct dp_netdev *dp,
const char *devname, struct dp_netdev_port **portp)
{
struct dp_netdev_port *port;
LIST_FOR_EACH (port, node, &dp->port_list) {
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)
{
struct dp_netdev_port *port;
int error;
error = get_port_by_number(dp, port_no, &port);
if (error) {
return error;
}
list_remove(&port->node);
dp->ports[odp_to_u32(port_no)] = NULL;
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_mutex_lock(&dp_netdev_mutex);
error = get_port_by_number(dp, port_no, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
ovs_mutex_unlock(&dp_netdev_mutex);
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_mutex_lock(&dp_netdev_mutex);
error = get_port_by_name(dp, devname, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static void
dp_netdev_free_flow(struct dp_netdev *dp, struct dp_netdev_flow *netdev_flow)
{
ovs_rwlock_wrlock(&dp->cls.rwlock);
classifier_remove(&dp->cls, &netdev_flow->cr);
ovs_rwlock_unlock(&dp->cls.rwlock);
cls_rule_destroy(&netdev_flow->cr);
hmap_remove(&dp->flow_table, &netdev_flow->node);
free(netdev_flow->actions);
free(netdev_flow);
}
static void
dp_netdev_flow_flush(struct dp_netdev *dp)
{
struct dp_netdev_flow *netdev_flow, *next;
HMAP_FOR_EACH_SAFE (netdev_flow, next, node, &dp->flow_table) {
dp_netdev_free_flow(dp, netdev_flow);
}
}
static int
dpif_netdev_flow_flush(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
ovs_mutex_lock(&dp_netdev_mutex);
dp_netdev_flow_flush(dp);
ovs_mutex_unlock(&dp_netdev_mutex);
return 0;
}
struct dp_netdev_port_state {
odp_port_t port_no;
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);
uint32_t port_idx;
ovs_mutex_lock(&dp_netdev_mutex);
for (port_idx = odp_to_u32(state->port_no);
port_idx < MAX_PORTS; port_idx++) {
struct dp_netdev_port *port = dp->ports[port_idx];
if (port) {
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;
state->port_no = u32_to_odp(port_idx + 1);
ovs_mutex_unlock(&dp_netdev_mutex);
return 0;
}
}
ovs_mutex_unlock(&dp_netdev_mutex);
return EOF;
}
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;
ovs_mutex_lock(&dp_netdev_mutex);
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;
}
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static void
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
ovs_mutex_lock(&dp_netdev_mutex);
seq_wait(dpif->dp->port_seq, dpif->last_port_seq);
ovs_mutex_unlock(&dp_netdev_mutex);
}
static struct dp_netdev_flow *
dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct flow *flow)
{
struct cls_rule *cr;
ovs_rwlock_wrlock(&dp->cls.rwlock);
cr = classifier_lookup(&dp->cls, flow, NULL);
ovs_rwlock_unlock(&dp->cls.rwlock);
return (cr
? CONTAINER_OF(cr, struct dp_netdev_flow, cr)
: NULL);
}
static struct dp_netdev_flow *
dp_netdev_find_flow(const struct dp_netdev *dp, const struct flow *flow)
{
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 netdev_flow;
}
}
return NULL;
}
static void
get_dpif_flow_stats(struct dp_netdev_flow *netdev_flow,
struct dpif_flow_stats *stats)
{
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) {
if (odp_flow_key_to_mask(mask_key, mask_key_len, mask, flow)) {
/* 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", ds_cstr(&s));
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;
}
ovs_mutex_lock(&dp_netdev_mutex);
netdev_flow = dp_netdev_find_flow(dp, &key);
if (netdev_flow) {
if (stats) {
get_dpif_flow_stats(netdev_flow, stats);
}
if (actionsp) {
*actionsp = ofpbuf_clone_data(netdev_flow->actions,
netdev_flow->actions_len);
}
} else {
error = ENOENT;
}
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static int
set_flow_actions(struct dp_netdev_flow *netdev_flow,
const struct nlattr *actions, size_t actions_len)
{
netdev_flow->actions = xrealloc(netdev_flow->actions, actions_len);
netdev_flow->actions_len = actions_len;
memcpy(netdev_flow->actions, actions, actions_len);
return 0;
}
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)
{
struct dp_netdev_flow *netdev_flow;
struct match match;
int error;
netdev_flow = xzalloc(sizeof *netdev_flow);
netdev_flow->flow = *flow;
match_init(&match, flow, wc);
cls_rule_init(&netdev_flow->cr, &match, NETDEV_RULE_PRIORITY);
ovs_rwlock_wrlock(&dp->cls.rwlock);
classifier_insert(&dp->cls, &netdev_flow->cr);
ovs_rwlock_unlock(&dp->cls.rwlock);
error = set_flow_actions(netdev_flow, actions, actions_len);
if (error) {
ovs_rwlock_wrlock(&dp->cls.rwlock);
classifier_remove(&dp->cls, &netdev_flow->cr);
ovs_rwlock_unlock(&dp->cls.rwlock);
cls_rule_destroy(&netdev_flow->cr);
free(netdev_flow);
return error;
}
hmap_insert(&dp->flow_table, &netdev_flow->node, flow_hash(flow, 0));
return 0;
}
static void
clear_stats(struct dp_netdev_flow *netdev_flow)
{
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_netdev_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)) {
error = set_flow_actions(netdev_flow, put->actions,
put->actions_len);