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ovs/lib/dpif-linux.c
Harold Lim 428b2eddc9 Rename NOT_REACHED to OVS_NOT_REACHED 
This allows other libraries to use util.h that has already
defined NOT_REACHED.

Signed-off-by: Harold Lim <haroldl@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
2013-12-17 13:16:39 -08:00

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/*
* Copyright (c) 2008, 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-linux.h"
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <net/if.h>
#include <linux/types.h>
#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <linux/sockios.h>
#include <poll.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <unistd.h>
#include "bitmap.h"
#include "dpif-provider.h"
#include "dynamic-string.h"
#include "flow.h"
#include "netdev.h"
#include "netdev-linux.h"
#include "netdev-vport.h"
#include "netlink-notifier.h"
#include "netlink-socket.h"
#include "netlink.h"
#include "odp-util.h"
#include "ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
#include "random.h"
#include "shash.h"
#include "sset.h"
#include "timeval.h"
#include "unaligned.h"
#include "util.h"
#include "vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_linux);
enum { MAX_PORTS = USHRT_MAX };
/* This ethtool flag was introduced in Linux 2.6.24, so it might be
* missing if we have old headers. */
#define ETH_FLAG_LRO (1 << 15) /* LRO is enabled */
struct dpif_linux_dp {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
int dp_ifindex;
/* Attributes. */
const char *name; /* OVS_DP_ATTR_NAME. */
const uint32_t *upcall_pid; /* OVS_DP_ATTR_UPCALL_PID. */
struct ovs_dp_stats stats; /* OVS_DP_ATTR_STATS. */
struct ovs_dp_megaflow_stats megaflow_stats;
/* OVS_DP_ATTR_MEGAFLOW_STATS.*/
};
static void dpif_linux_dp_init(struct dpif_linux_dp *);
static int dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *,
const struct ofpbuf *);
static void dpif_linux_dp_dump_start(struct nl_dump *);
static int dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
static int dpif_linux_dp_get(const struct dpif *, struct dpif_linux_dp *reply,
struct ofpbuf **bufp);
struct dpif_linux_flow {
/* Generic Netlink header. */
uint8_t cmd;
/* struct ovs_header. */
unsigned int nlmsg_flags;
int dp_ifindex;
/* Attributes.
*
* The 'stats' member points to 64-bit data that might only be aligned on
* 32-bit boundaries, so get_unaligned_u64() should be used to access its
* values.
*
* If 'actions' is nonnull then OVS_FLOW_ATTR_ACTIONS will be included in
* the Netlink version of the command, even if actions_len is zero. */
const struct nlattr *key; /* OVS_FLOW_ATTR_KEY. */
size_t key_len;
const struct nlattr *mask; /* OVS_FLOW_ATTR_MASK. */
size_t mask_len;
const struct nlattr *actions; /* OVS_FLOW_ATTR_ACTIONS. */
size_t actions_len;
const struct ovs_flow_stats *stats; /* OVS_FLOW_ATTR_STATS. */
const uint8_t *tcp_flags; /* OVS_FLOW_ATTR_TCP_FLAGS. */
const ovs_32aligned_u64 *used; /* OVS_FLOW_ATTR_USED. */
bool clear; /* OVS_FLOW_ATTR_CLEAR. */
};
static void dpif_linux_flow_init(struct dpif_linux_flow *);
static int dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *,
const struct ofpbuf *);
static void dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *,
struct ofpbuf *);
static int dpif_linux_flow_transact(struct dpif_linux_flow *request,
struct dpif_linux_flow *reply,
struct ofpbuf **bufp);
static void dpif_linux_flow_get_stats(const struct dpif_linux_flow *,
struct dpif_flow_stats *);
/* One of the dpif channels between the kernel and userspace. */
struct dpif_channel {
struct nl_sock *sock; /* Netlink socket. */
long long int last_poll; /* Last time this channel was polled. */
};
static void report_loss(struct dpif *, struct dpif_channel *);
/* Datapath interface for the openvswitch Linux kernel module. */
struct dpif_linux {
struct dpif dpif;
int dp_ifindex;
/* Upcall messages. */
struct ovs_mutex upcall_lock;
int uc_array_size; /* Size of 'channels' and 'epoll_events'. */
struct dpif_channel *channels;
struct epoll_event *epoll_events;
int epoll_fd; /* epoll fd that includes channel socks. */
int n_events; /* Num events returned by epoll_wait(). */
int event_offset; /* Offset into 'epoll_events'. */
/* Change notification. */
struct nl_sock *port_notifier; /* vport multicast group subscriber. */
bool refresh_channels;
};
static struct vlog_rate_limit error_rl = VLOG_RATE_LIMIT_INIT(9999, 5);
/* Generic Netlink family numbers for OVS.
*
* Initialized by dpif_linux_init(). */
static int ovs_datapath_family;
static int ovs_vport_family;
static int ovs_flow_family;
static int ovs_packet_family;
/* Generic Netlink multicast groups for OVS.
*
* Initialized by dpif_linux_init(). */
static unsigned int ovs_vport_mcgroup;
static int dpif_linux_init(void);
static int open_dpif(const struct dpif_linux_dp *, struct dpif **);
static uint32_t dpif_linux_port_get_pid(const struct dpif *,
odp_port_t port_no);
static int dpif_linux_refresh_channels(struct dpif *);
static void dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *,
struct ofpbuf *);
static int dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *,
const struct ofpbuf *);
static struct dpif_linux *
dpif_linux_cast(const struct dpif *dpif)
{
dpif_assert_class(dpif, &dpif_linux_class);
return CONTAINER_OF(dpif, struct dpif_linux, dpif);
}
static int
dpif_linux_enumerate(struct sset *all_dps)
{
struct nl_dump dump;
struct ofpbuf msg;
int error;
error = dpif_linux_init();
if (error) {
return error;
}
dpif_linux_dp_dump_start(&dump);
while (nl_dump_next(&dump, &msg)) {
struct dpif_linux_dp dp;
if (!dpif_linux_dp_from_ofpbuf(&dp, &msg)) {
sset_add(all_dps, dp.name);
}
}
return nl_dump_done(&dump);
}
static int
dpif_linux_open(const struct dpif_class *class OVS_UNUSED, const char *name,
bool create, struct dpif **dpifp)
{
struct dpif_linux_dp dp_request, dp;
struct ofpbuf *buf;
uint32_t upcall_pid;
int error;
error = dpif_linux_init();
if (error) {
return error;
}
/* Create or look up datapath. */
dpif_linux_dp_init(&dp_request);
if (create) {
dp_request.cmd = OVS_DP_CMD_NEW;
upcall_pid = 0;
dp_request.upcall_pid = &upcall_pid;
} else {
dp_request.cmd = OVS_DP_CMD_GET;
}
dp_request.name = name;
error = dpif_linux_dp_transact(&dp_request, &dp, &buf);
if (error) {
return error;
}
error = open_dpif(&dp, dpifp);
ofpbuf_delete(buf);
return error;
}
static int
open_dpif(const struct dpif_linux_dp *dp, struct dpif **dpifp)
{
struct dpif_linux *dpif;
dpif = xzalloc(sizeof *dpif);
dpif->port_notifier = NULL;
ovs_mutex_init(&dpif->upcall_lock);
dpif->epoll_fd = -1;
dpif_init(&dpif->dpif, &dpif_linux_class, dp->name,
dp->dp_ifindex, dp->dp_ifindex);
dpif->dp_ifindex = dp->dp_ifindex;
*dpifp = &dpif->dpif;
return 0;
}
static void
destroy_channels(struct dpif_linux *dpif)
{
unsigned int i;
if (dpif->epoll_fd < 0) {
return;
}
for (i = 0; i < dpif->uc_array_size; i++ ) {
struct dpif_linux_vport vport_request;
struct dpif_channel *ch = &dpif->channels[i];
uint32_t upcall_pid = 0;
if (!ch->sock) {
continue;
}
epoll_ctl(dpif->epoll_fd, EPOLL_CTL_DEL, nl_sock_fd(ch->sock), NULL);
/* Turn off upcalls. */
dpif_linux_vport_init(&vport_request);
vport_request.cmd = OVS_VPORT_CMD_SET;
vport_request.dp_ifindex = dpif->dp_ifindex;
vport_request.port_no = u32_to_odp(i);
vport_request.upcall_pid = &upcall_pid;
dpif_linux_vport_transact(&vport_request, NULL, NULL);
nl_sock_destroy(ch->sock);
}
free(dpif->channels);
dpif->channels = NULL;
dpif->uc_array_size = 0;
free(dpif->epoll_events);
dpif->epoll_events = NULL;
dpif->n_events = dpif->event_offset = 0;
/* Don't close dpif->epoll_fd since that would cause other threads that
* call dpif_recv_wait(dpif) to wait on an arbitrary fd or a closed fd. */
}
static int
add_channel(struct dpif_linux *dpif, odp_port_t port_no, struct nl_sock *sock)
{
struct epoll_event event;
uint32_t port_idx = odp_to_u32(port_no);
if (dpif->epoll_fd < 0) {
return 0;
}
/* We assume that the datapath densely chooses port numbers, which
* can therefore be used as an index into an array of channels. */
if (port_idx >= dpif->uc_array_size) {
uint32_t new_size = port_idx + 1;
uint32_t i;
if (new_size > MAX_PORTS) {
VLOG_WARN_RL(&error_rl, "%s: datapath port %"PRIu32" too big",
dpif_name(&dpif->dpif), port_no);
return EFBIG;
}
dpif->channels = xrealloc(dpif->channels,
new_size * sizeof *dpif->channels);
for (i = dpif->uc_array_size; i < new_size; i++) {
dpif->channels[i].sock = NULL;
}
dpif->epoll_events = xrealloc(dpif->epoll_events,
new_size * sizeof *dpif->epoll_events);
dpif->uc_array_size = new_size;
}
memset(&event, 0, sizeof event);
event.events = EPOLLIN;
event.data.u32 = port_idx;
if (epoll_ctl(dpif->epoll_fd, EPOLL_CTL_ADD, nl_sock_fd(sock),
&event) < 0) {
return errno;
}
nl_sock_destroy(dpif->channels[port_idx].sock);
dpif->channels[port_idx].sock = sock;
dpif->channels[port_idx].last_poll = LLONG_MIN;
return 0;
}
static void
del_channel(struct dpif_linux *dpif, odp_port_t port_no)
{
struct dpif_channel *ch;
uint32_t port_idx = odp_to_u32(port_no);
if (dpif->epoll_fd < 0 || port_idx >= dpif->uc_array_size) {
return;
}
ch = &dpif->channels[port_idx];
if (!ch->sock) {
return;
}
epoll_ctl(dpif->epoll_fd, EPOLL_CTL_DEL, nl_sock_fd(ch->sock), NULL);
dpif->event_offset = dpif->n_events = 0;
nl_sock_destroy(ch->sock);
ch->sock = NULL;
}
static void
dpif_linux_close(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
nl_sock_destroy(dpif->port_notifier);
destroy_channels(dpif);
if (dpif->epoll_fd >= 0) {
close(dpif->epoll_fd);
}
ovs_mutex_destroy(&dpif->upcall_lock);
free(dpif);
}
static int
dpif_linux_destroy(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp dp;
dpif_linux_dp_init(&dp);
dp.cmd = OVS_DP_CMD_DEL;
dp.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_dp_transact(&dp, NULL, NULL);
}
static void
dpif_linux_run(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->refresh_channels) {
dpif->refresh_channels = false;
dpif_linux_refresh_channels(dpif_);
}
}
static int
dpif_linux_get_stats(const struct dpif *dpif_, struct dpif_dp_stats *stats)
{
struct dpif_linux_dp dp;
struct ofpbuf *buf;
int error;
error = dpif_linux_dp_get(dpif_, &dp, &buf);
if (!error) {
stats->n_hit = dp.stats.n_hit;
stats->n_missed = dp.stats.n_missed;
stats->n_lost = dp.stats.n_lost;
stats->n_flows = dp.stats.n_flows;
stats->n_masks = dp.megaflow_stats.n_masks;
stats->n_mask_hit = dp.megaflow_stats.n_mask_hit;
ofpbuf_delete(buf);
}
return error;
}
static const char *
get_vport_type(const struct dpif_linux_vport *vport)
{
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
switch (vport->type) {
case OVS_VPORT_TYPE_NETDEV:
return "system";
case OVS_VPORT_TYPE_INTERNAL:
return "internal";
case OVS_VPORT_TYPE_GRE:
return "gre";
case OVS_VPORT_TYPE_GRE64:
return "gre64";
case OVS_VPORT_TYPE_VXLAN:
return "vxlan";
case OVS_VPORT_TYPE_LISP:
return "lisp";
case OVS_VPORT_TYPE_UNSPEC:
case __OVS_VPORT_TYPE_MAX:
break;
}
VLOG_WARN_RL(&rl, "dp%d: port `%s' has unsupported type %u",
vport->dp_ifindex, vport->name, (unsigned int) vport->type);
return "unknown";
}
static enum ovs_vport_type
netdev_to_ovs_vport_type(const struct netdev *netdev)
{
const char *type = netdev_get_type(netdev);
if (!strcmp(type, "tap") || !strcmp(type, "system")) {
return OVS_VPORT_TYPE_NETDEV;
} else if (!strcmp(type, "internal")) {
return OVS_VPORT_TYPE_INTERNAL;
} else if (strstr(type, "gre64")) {
return OVS_VPORT_TYPE_GRE64;
} else if (strstr(type, "gre")) {
return OVS_VPORT_TYPE_GRE;
} else if (!strcmp(type, "vxlan")) {
return OVS_VPORT_TYPE_VXLAN;
} else if (!strcmp(type, "lisp")) {
return OVS_VPORT_TYPE_LISP;
} else {
return OVS_VPORT_TYPE_UNSPEC;
}
}
static int
dpif_linux_port_add__(struct dpif *dpif_, struct netdev *netdev,
odp_port_t *port_nop)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
const struct netdev_tunnel_config *tnl_cfg;
char namebuf[NETDEV_VPORT_NAME_BUFSIZE];
const char *name = netdev_vport_get_dpif_port(netdev,
namebuf, sizeof namebuf);
const char *type = netdev_get_type(netdev);
struct dpif_linux_vport request, reply;
struct nl_sock *sock = NULL;
uint32_t upcall_pid;
struct ofpbuf *buf;
uint64_t options_stub[64 / 8];
struct ofpbuf options;
int error;
if (dpif->epoll_fd >= 0) {
error = nl_sock_create(NETLINK_GENERIC, &sock);
if (error) {
return error;
}
}
dpif_linux_vport_init(&request);
request.cmd = OVS_VPORT_CMD_NEW;
request.dp_ifindex = dpif->dp_ifindex;
request.type = netdev_to_ovs_vport_type(netdev);
if (request.type == OVS_VPORT_TYPE_UNSPEC) {
VLOG_WARN_RL(&error_rl, "%s: cannot create port `%s' because it has "
"unsupported type `%s'",
dpif_name(dpif_), name, type);
nl_sock_destroy(sock);
return EINVAL;
}
request.name = name;
if (request.type == OVS_VPORT_TYPE_NETDEV) {
netdev_linux_ethtool_set_flag(netdev, ETH_FLAG_LRO, "LRO", false);
}
tnl_cfg = netdev_get_tunnel_config(netdev);
if (tnl_cfg && tnl_cfg->dst_port != 0) {
ofpbuf_use_stack(&options, options_stub, sizeof options_stub);
nl_msg_put_u16(&options, OVS_TUNNEL_ATTR_DST_PORT,
ntohs(tnl_cfg->dst_port));
request.options = options.data;
request.options_len = options.size;
}
request.port_no = *port_nop;
upcall_pid = sock ? nl_sock_pid(sock) : 0;
request.upcall_pid = &upcall_pid;
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (!error) {
*port_nop = reply.port_no;
VLOG_DBG("%s: assigning port %"PRIu32" to netlink pid %"PRIu32,
dpif_name(dpif_), reply.port_no, upcall_pid);
} else {
if (error == EBUSY && *port_nop != ODPP_NONE) {
VLOG_INFO("%s: requested port %"PRIu32" is in use",
dpif_name(dpif_), *port_nop);
}
nl_sock_destroy(sock);
ofpbuf_delete(buf);
return error;
}
ofpbuf_delete(buf);
if (sock) {
error = add_channel(dpif, *port_nop, sock);
if (error) {
VLOG_INFO("%s: could not add channel for port %s",
dpif_name(dpif_), name);
/* Delete the port. */
dpif_linux_vport_init(&request);
request.cmd = OVS_VPORT_CMD_DEL;
request.dp_ifindex = dpif->dp_ifindex;
request.port_no = *port_nop;
dpif_linux_vport_transact(&request, NULL, NULL);
nl_sock_destroy(sock);
return error;
}
}
return 0;
}
static int
dpif_linux_port_add(struct dpif *dpif_, struct netdev *netdev,
odp_port_t *port_nop)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
ovs_mutex_lock(&dpif->upcall_lock);
error = dpif_linux_port_add__(dpif_, netdev, port_nop);
ovs_mutex_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_linux_port_del__(struct dpif *dpif_, odp_port_t port_no)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_vport vport;
int error;
dpif_linux_vport_init(&vport);
vport.cmd = OVS_VPORT_CMD_DEL;
vport.dp_ifindex = dpif->dp_ifindex;
vport.port_no = port_no;
error = dpif_linux_vport_transact(&vport, NULL, NULL);
del_channel(dpif, port_no);
return error;
}
static int
dpif_linux_port_del(struct dpif *dpif_, odp_port_t port_no)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
ovs_mutex_lock(&dpif->upcall_lock);
error = dpif_linux_port_del__(dpif_, port_no);
ovs_mutex_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_linux_port_query__(const struct dpif *dpif, odp_port_t port_no,
const char *port_name, struct dpif_port *dpif_port)
{
struct dpif_linux_vport request;
struct dpif_linux_vport reply;
struct ofpbuf *buf;
int error;
dpif_linux_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.dp_ifindex = dpif_linux_cast(dpif)->dp_ifindex;
request.port_no = port_no;
request.name = port_name;
error = dpif_linux_vport_transact(&request, &reply, &buf);
if (!error) {
if (reply.dp_ifindex != request.dp_ifindex) {
/* A query by name reported that 'port_name' is in some datapath
* other than 'dpif', but the caller wants to know about 'dpif'. */
error = ENODEV;
} else if (dpif_port) {
dpif_port->name = xstrdup(reply.name);
dpif_port->type = xstrdup(get_vport_type(&reply));
dpif_port->port_no = reply.port_no;
}
ofpbuf_delete(buf);
}
return error;
}
static int
dpif_linux_port_query_by_number(const struct dpif *dpif, odp_port_t port_no,
struct dpif_port *dpif_port)
{
return dpif_linux_port_query__(dpif, port_no, NULL, dpif_port);
}
static int
dpif_linux_port_query_by_name(const struct dpif *dpif, const char *devname,
struct dpif_port *dpif_port)
{
return dpif_linux_port_query__(dpif, 0, devname, dpif_port);
}
static uint32_t
dpif_linux_get_max_ports(const struct dpif *dpif OVS_UNUSED)
{
return MAX_PORTS;
}
static uint32_t
dpif_linux_port_get_pid(const struct dpif *dpif_, odp_port_t port_no)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
uint32_t port_idx = odp_to_u32(port_no);
uint32_t pid = 0;
ovs_mutex_lock(&dpif->upcall_lock);
if (dpif->epoll_fd >= 0) {
/* The ODPP_NONE "reserved" port number uses the "ovs-system"'s
* channel, since it is not heavily loaded. */
uint32_t idx = port_idx >= dpif->uc_array_size ? 0 : port_idx;
pid = nl_sock_pid(dpif->channels[idx].sock);
}
ovs_mutex_unlock(&dpif->upcall_lock);
return pid;
}
static int
dpif_linux_flow_flush(struct dpif *dpif_)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow flow;
dpif_linux_flow_init(&flow);
flow.cmd = OVS_FLOW_CMD_DEL;
flow.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_flow_transact(&flow, NULL, NULL);
}
struct dpif_linux_port_state {
struct nl_dump dump;
};
static void
dpif_linux_port_dump_start__(const struct dpif *dpif_, struct nl_dump *dump)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_vport request;
struct ofpbuf *buf;
dpif_linux_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(&request, buf);
nl_dump_start(dump, NETLINK_GENERIC, buf);
ofpbuf_delete(buf);
}
static int
dpif_linux_port_dump_start(const struct dpif *dpif, void **statep)
{
struct dpif_linux_port_state *state;
*statep = state = xmalloc(sizeof *state);
dpif_linux_port_dump_start__(dpif, &state->dump);
return 0;
}
static bool
dpif_linux_port_dump_next__(const struct dpif *dpif_, struct nl_dump *dump,
struct dpif_linux_vport *vport)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct ofpbuf buf;
int error;
if (!nl_dump_next(dump, &buf)) {
return EOF;
}
error = dpif_linux_vport_from_ofpbuf(vport, &buf);
if (error) {
VLOG_WARN_RL(&error_rl, "%s: failed to parse vport record (%s)",
dpif_name(&dpif->dpif), ovs_strerror(error));
}
return error;
}
static int
dpif_linux_port_dump_next(const struct dpif *dpif OVS_UNUSED, void *state_,
struct dpif_port *dpif_port)
{
struct dpif_linux_port_state *state = state_;
struct dpif_linux_vport vport;
int error;
error = dpif_linux_port_dump_next__(dpif, &state->dump, &vport);
if (error) {
return error;
}
dpif_port->name = CONST_CAST(char *, vport.name);
dpif_port->type = CONST_CAST(char *, get_vport_type(&vport));
dpif_port->port_no = vport.port_no;
return 0;
}
static int
dpif_linux_port_dump_done(const struct dpif *dpif_ OVS_UNUSED, void *state_)
{
struct dpif_linux_port_state *state = state_;
int error = nl_dump_done(&state->dump);
free(state);
return error;
}
static int
dpif_linux_port_poll(const struct dpif *dpif_, char **devnamep)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
/* Lazily create the Netlink socket to listen for notifications. */
if (!dpif->port_notifier) {
struct nl_sock *sock;
int error;
error = nl_sock_create(NETLINK_GENERIC, &sock);
if (error) {
return error;
}
error = nl_sock_join_mcgroup(sock, ovs_vport_mcgroup);
if (error) {
nl_sock_destroy(sock);
return error;
}
dpif->port_notifier = sock;
/* We have no idea of the current state so report that everything
* changed. */
return ENOBUFS;
}
for (;;) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
uint64_t buf_stub[4096 / 8];
struct ofpbuf buf;
int error;
ofpbuf_use_stub(&buf, buf_stub, sizeof buf_stub);
error = nl_sock_recv(dpif->port_notifier, &buf, false);
if (!error) {
struct dpif_linux_vport vport;
error = dpif_linux_vport_from_ofpbuf(&vport, &buf);
if (!error) {
if (vport.dp_ifindex == dpif->dp_ifindex
&& (vport.cmd == OVS_VPORT_CMD_NEW
|| vport.cmd == OVS_VPORT_CMD_DEL
|| vport.cmd == OVS_VPORT_CMD_SET)) {
VLOG_DBG("port_changed: dpif:%s vport:%s cmd:%"PRIu8,
dpif->dpif.full_name, vport.name, vport.cmd);
if (vport.cmd == OVS_VPORT_CMD_DEL) {
dpif->refresh_channels = true;
}
*devnamep = xstrdup(vport.name);
ofpbuf_uninit(&buf);
return 0;
}
}
} else if (error != EAGAIN) {
VLOG_WARN_RL(&rl, "error reading or parsing netlink (%s)",
ovs_strerror(error));
nl_sock_drain(dpif->port_notifier);
error = ENOBUFS;
}
ofpbuf_uninit(&buf);
if (error) {
return error;
}
}
}
static void
dpif_linux_port_poll_wait(const struct dpif *dpif_)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if (dpif->port_notifier) {
nl_sock_wait(dpif->port_notifier, POLLIN);
} else {
poll_immediate_wake();
}
}
static int
dpif_linux_flow_get__(const struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow request;
dpif_linux_flow_init(&request);
request.cmd = OVS_FLOW_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
request.key = key;
request.key_len = key_len;
return dpif_linux_flow_transact(&request, reply, bufp);
}
static int
dpif_linux_flow_get(const struct dpif *dpif_,
const struct nlattr *key, size_t key_len,
struct ofpbuf **actionsp, struct dpif_flow_stats *stats)
{
struct dpif_linux_flow reply;
struct ofpbuf *buf;
int error;
error = dpif_linux_flow_get__(dpif_, key, key_len, &reply, &buf);
if (!error) {
if (stats) {
dpif_linux_flow_get_stats(&reply, stats);
}
if (actionsp) {
buf->data = CONST_CAST(struct nlattr *, reply.actions);
buf->size = reply.actions_len;
*actionsp = buf;
} else {
ofpbuf_delete(buf);
}
}
return error;
}
static void
dpif_linux_init_flow_put(struct dpif *dpif_, const struct dpif_flow_put *put,
struct dpif_linux_flow *request)
{
static const struct nlattr dummy_action;
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
dpif_linux_flow_init(request);
request->cmd = (put->flags & DPIF_FP_CREATE
? OVS_FLOW_CMD_NEW : OVS_FLOW_CMD_SET);
request->dp_ifindex = dpif->dp_ifindex;
request->key = put->key;
request->key_len = put->key_len;
request->mask = put->mask;
request->mask_len = put->mask_len;
/* Ensure that OVS_FLOW_ATTR_ACTIONS will always be included. */
request->actions = (put->actions
? put->actions
: CONST_CAST(struct nlattr *, &dummy_action));
request->actions_len = put->actions_len;
if (put->flags & DPIF_FP_ZERO_STATS) {
request->clear = true;
}
request->nlmsg_flags = put->flags & DPIF_FP_MODIFY ? 0 : NLM_F_CREATE;
}
static int
dpif_linux_flow_put(struct dpif *dpif_, const struct dpif_flow_put *put)
{
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_init_flow_put(dpif_, put, &request);
error = dpif_linux_flow_transact(&request,
put->stats ? &reply : NULL,
put->stats ? &buf : NULL);
if (!error && put->stats) {
dpif_linux_flow_get_stats(&reply, put->stats);
ofpbuf_delete(buf);
}
return error;
}
static void
dpif_linux_init_flow_del(struct dpif *dpif_, const struct dpif_flow_del *del,
struct dpif_linux_flow *request)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
dpif_linux_flow_init(request);
request->cmd = OVS_FLOW_CMD_DEL;
request->dp_ifindex = dpif->dp_ifindex;
request->key = del->key;
request->key_len = del->key_len;
}
static int
dpif_linux_flow_del(struct dpif *dpif_, const struct dpif_flow_del *del)
{
struct dpif_linux_flow request, reply;
struct ofpbuf *buf;
int error;
dpif_linux_init_flow_del(dpif_, del, &request);
error = dpif_linux_flow_transact(&request,
del->stats ? &reply : NULL,
del->stats ? &buf : NULL);
if (!error && del->stats) {
dpif_linux_flow_get_stats(&reply, del->stats);
ofpbuf_delete(buf);
}
return error;
}
struct dpif_linux_flow_state {
struct nl_dump dump;
struct dpif_linux_flow flow;
struct dpif_flow_stats stats;
struct ofpbuf *buf;
};
static int
dpif_linux_flow_dump_start(const struct dpif *dpif_, void **statep)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_flow_state *state;
struct dpif_linux_flow request;
struct ofpbuf *buf;
*statep = state = xmalloc(sizeof *state);
dpif_linux_flow_init(&request);
request.cmd = OVS_FLOW_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(&request, buf);
nl_dump_start(&state->dump, NETLINK_GENERIC, buf);
ofpbuf_delete(buf);
state->buf = NULL;
return 0;
}
static int
dpif_linux_flow_dump_next(const struct dpif *dpif_ OVS_UNUSED, 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 dpif_linux_flow_state *state = state_;
struct ofpbuf buf;
int error;
do {
ofpbuf_delete(state->buf);
state->buf = NULL;
if (!nl_dump_next(&state->dump, &buf)) {
return EOF;
}
error = dpif_linux_flow_from_ofpbuf(&state->flow, &buf);
if (error) {
return error;
}
if (actions && !state->flow.actions) {
error = dpif_linux_flow_get__(dpif_, state->flow.key,
state->flow.key_len,
&state->flow, &state->buf);
if (error == ENOENT) {
VLOG_DBG("dumped flow disappeared on get");
} else if (error) {
VLOG_WARN("error fetching dumped flow: %s",
ovs_strerror(error));
}
}
} while (error);
if (actions) {
*actions = state->flow.actions;
*actions_len = state->flow.actions_len;
}
if (key) {
*key = state->flow.key;
*key_len = state->flow.key_len;
}
if (mask) {
*mask = state->flow.mask;
*mask_len = state->flow.mask ? state->flow.mask_len : 0;
}
if (stats) {
dpif_linux_flow_get_stats(&state->flow, &state->stats);
*stats = &state->stats;
}
return error;
}
static int
dpif_linux_flow_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dpif_linux_flow_state *state = state_;
int error = nl_dump_done(&state->dump);
ofpbuf_delete(state->buf);
free(state);
return error;
}
static void
dpif_linux_encode_execute(int dp_ifindex, const struct dpif_execute *d_exec,
struct ofpbuf *buf)
{
struct ovs_header *k_exec;
ofpbuf_prealloc_tailroom(buf, (64
+ d_exec->packet->size
+ d_exec->key_len
+ d_exec->actions_len));
nl_msg_put_genlmsghdr(buf, 0, ovs_packet_family, NLM_F_REQUEST,
OVS_PACKET_CMD_EXECUTE, OVS_PACKET_VERSION);
k_exec = ofpbuf_put_uninit(buf, sizeof *k_exec);
k_exec->dp_ifindex = dp_ifindex;
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_PACKET,
d_exec->packet->data, d_exec->packet->size);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_KEY, d_exec->key, d_exec->key_len);
nl_msg_put_unspec(buf, OVS_PACKET_ATTR_ACTIONS,
d_exec->actions, d_exec->actions_len);
}
static int
dpif_linux_execute__(int dp_ifindex, const struct dpif_execute *execute)
{
uint64_t request_stub[1024 / 8];
struct ofpbuf request;
int error;
ofpbuf_use_stub(&request, request_stub, sizeof request_stub);
dpif_linux_encode_execute(dp_ifindex, execute, &request);
error = nl_transact(NETLINK_GENERIC, &request, NULL);
ofpbuf_uninit(&request);
return error;
}
static int
dpif_linux_execute(struct dpif *dpif_, const struct dpif_execute *execute)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
return dpif_linux_execute__(dpif->dp_ifindex, execute);
}
#define MAX_OPS 50
static void
dpif_linux_operate__(struct dpif *dpif_, struct dpif_op **ops, size_t n_ops)
{
const struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct op_auxdata {
struct nl_transaction txn;
struct ofpbuf request;
uint64_t request_stub[1024 / 8];
struct ofpbuf reply;
uint64_t reply_stub[1024 / 8];
} auxes[MAX_OPS];
struct nl_transaction *txnsp[MAX_OPS];
size_t i;
ovs_assert(n_ops <= MAX_OPS);
for (i = 0; i < n_ops; i++) {
struct op_auxdata *aux = &auxes[i];
struct dpif_op *op = ops[i];
struct dpif_flow_put *put;
struct dpif_flow_del *del;
struct dpif_execute *execute;
struct dpif_linux_flow flow;
ofpbuf_use_stub(&aux->request,
aux->request_stub, sizeof aux->request_stub);
aux->txn.request = &aux->request;
ofpbuf_use_stub(&aux->reply, aux->reply_stub, sizeof aux->reply_stub);
aux->txn.reply = NULL;
switch (op->type) {
case DPIF_OP_FLOW_PUT:
put = &op->u.flow_put;
dpif_linux_init_flow_put(dpif_, put, &flow);
if (put->stats) {
flow.nlmsg_flags |= NLM_F_ECHO;
aux->txn.reply = &aux->reply;
}
dpif_linux_flow_to_ofpbuf(&flow, &aux->request);
break;
case DPIF_OP_FLOW_DEL:
del = &op->u.flow_del;
dpif_linux_init_flow_del(dpif_, del, &flow);
if (del->stats) {
flow.nlmsg_flags |= NLM_F_ECHO;
aux->txn.reply = &aux->reply;
}
dpif_linux_flow_to_ofpbuf(&flow, &aux->request);
break;
case DPIF_OP_EXECUTE:
execute = &op->u.execute;
dpif_linux_encode_execute(dpif->dp_ifindex, execute,
&aux->request);
break;
default:
OVS_NOT_REACHED();
}
}
for (i = 0; i < n_ops; i++) {
txnsp[i] = &auxes[i].txn;
}
nl_transact_multiple(NETLINK_GENERIC, txnsp, n_ops);
for (i = 0; i < n_ops; i++) {
struct op_auxdata *aux = &auxes[i];
struct nl_transaction *txn = &auxes[i].txn;
struct dpif_op *op = ops[i];
struct dpif_flow_put *put;
struct dpif_flow_del *del;
op->error = txn->error;
switch (op->type) {
case DPIF_OP_FLOW_PUT:
put = &op->u.flow_put;
if (put->stats) {
if (!op->error) {
struct dpif_linux_flow reply;
op->error = dpif_linux_flow_from_ofpbuf(&reply,
txn->reply);
if (!op->error) {
dpif_linux_flow_get_stats(&reply, put->stats);
}
}
if (op->error) {
memset(put->stats, 0, sizeof *put->stats);
}
}
break;
case DPIF_OP_FLOW_DEL:
del = &op->u.flow_del;
if (del->stats) {
if (!op->error) {
struct dpif_linux_flow reply;
op->error = dpif_linux_flow_from_ofpbuf(&reply,
txn->reply);
if (!op->error) {
dpif_linux_flow_get_stats(&reply, del->stats);
}
}
if (op->error) {
memset(del->stats, 0, sizeof *del->stats);
}
}
break;
case DPIF_OP_EXECUTE:
break;
default:
OVS_NOT_REACHED();
}
ofpbuf_uninit(&aux->request);
ofpbuf_uninit(&aux->reply);
}
}
static void
dpif_linux_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops)
{
while (n_ops > 0) {
size_t chunk = MIN(n_ops, MAX_OPS);
dpif_linux_operate__(dpif, ops, chunk);
ops += chunk;
n_ops -= chunk;
}
}
/* Synchronizes 'dpif->channels' with the set of vports currently in 'dpif' in
* the kernel, by adding a new channel for any kernel vport that lacks one and
* deleting any channels that have no backing kernel vports. */
static int
dpif_linux_refresh_channels(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
unsigned long int *keep_channels;
struct dpif_linux_vport vport;
size_t keep_channels_nbits;
struct nl_dump dump;
int retval = 0;
size_t i;
/* To start with, we need an epoll fd. */
if (dpif->epoll_fd < 0) {
dpif->epoll_fd = epoll_create(10);
if (dpif->epoll_fd < 0) {
return errno;
}
}
keep_channels_nbits = dpif->uc_array_size;
keep_channels = bitmap_allocate(keep_channels_nbits);
dpif->n_events = dpif->event_offset = 0;
dpif_linux_port_dump_start__(dpif_, &dump);
while (dpif_linux_port_dump_next__(dpif_, &dump, &vport)) {
uint32_t port_no = odp_to_u32(vport.port_no);
struct nl_sock *sock = (port_no < dpif->uc_array_size
? dpif->channels[port_no].sock
: NULL);
bool new_sock = !sock;
int error;
if (new_sock) {
error = nl_sock_create(NETLINK_GENERIC, &sock);
if (error) {
retval = error;
goto error;
}
}
/* Configure the vport to deliver misses to 'sock'. */
if (!vport.upcall_pid || *vport.upcall_pid != nl_sock_pid(sock)) {
uint32_t upcall_pid = nl_sock_pid(sock);
struct dpif_linux_vport vport_request;
dpif_linux_vport_init(&vport_request);
vport_request.cmd = OVS_VPORT_CMD_SET;
vport_request.dp_ifindex = dpif->dp_ifindex;
vport_request.port_no = vport.port_no;
vport_request.upcall_pid = &upcall_pid;
error = dpif_linux_vport_transact(&vport_request, NULL, NULL);
if (!error) {
VLOG_DBG("%s: assigning port %"PRIu32" to netlink pid %"PRIu32,
dpif_name(&dpif->dpif), vport_request.port_no,
upcall_pid);
} else {
VLOG_WARN_RL(&error_rl,
"%s: failed to set upcall pid on port: %s",
dpif_name(&dpif->dpif), ovs_strerror(error));
if (error != ENODEV && error != ENOENT) {
retval = error;
} else {
/* The vport isn't really there, even though the dump says
* it is. Probably we just hit a race after a port
* disappeared. */
}
goto error;
}
}
if (new_sock) {
error = add_channel(dpif, vport.port_no, sock);
if (error) {
VLOG_INFO("%s: could not add channel for port %s",
dpif_name(dpif_), vport.name);
retval = error;
goto error;
}
}
if (port_no < keep_channels_nbits) {
bitmap_set1(keep_channels, port_no);
}
continue;
error:
nl_sock_destroy(sock);
}
nl_dump_done(&dump);
/* Discard any saved channels that we didn't reuse. */
for (i = 0; i < keep_channels_nbits; i++) {
if (!bitmap_is_set(keep_channels, i)) {
nl_sock_destroy(dpif->channels[i].sock);
dpif->channels[i].sock = NULL;
}
}
free(keep_channels);
return retval;
}
static int
dpif_linux_recv_set__(struct dpif *dpif_, bool enable)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
if ((dpif->epoll_fd >= 0) == enable) {
return 0;
} else if (!enable) {
destroy_channels(dpif);
return 0;
} else {
return dpif_linux_refresh_channels(dpif_);
}
}
static int
dpif_linux_recv_set(struct dpif *dpif_, bool enable)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
ovs_mutex_lock(&dpif->upcall_lock);
error = dpif_linux_recv_set__(dpif_, enable);
ovs_mutex_unlock(&dpif->upcall_lock);
return error;
}
static int
dpif_linux_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
uint32_t queue_id, uint32_t *priority)
{
if (queue_id < 0xf000) {
*priority = TC_H_MAKE(1 << 16, queue_id + 1);
return 0;
} else {
return EINVAL;
}
}
static int
parse_odp_packet(struct ofpbuf *buf, struct dpif_upcall *upcall,
int *dp_ifindex)
{
static const struct nl_policy ovs_packet_policy[] = {
/* Always present. */
[OVS_PACKET_ATTR_PACKET] = { .type = NL_A_UNSPEC,
.min_len = ETH_HEADER_LEN },
[OVS_PACKET_ATTR_KEY] = { .type = NL_A_NESTED },
/* OVS_PACKET_CMD_ACTION only. */
[OVS_PACKET_ATTR_USERDATA] = { .type = NL_A_UNSPEC, .optional = true },
};
struct ovs_header *ovs_header;
struct nlattr *a[ARRAY_SIZE(ovs_packet_policy)];
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
int type;
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_packet_family
|| !nl_policy_parse(&b, 0, ovs_packet_policy, a,
ARRAY_SIZE(ovs_packet_policy))) {
return EINVAL;
}
type = (genl->cmd == OVS_PACKET_CMD_MISS ? DPIF_UC_MISS
: genl->cmd == OVS_PACKET_CMD_ACTION ? DPIF_UC_ACTION
: -1);
if (type < 0) {
return EINVAL;
}
memset(upcall, 0, sizeof *upcall);
upcall->type = type;
upcall->key = CONST_CAST(struct nlattr *,
nl_attr_get(a[OVS_PACKET_ATTR_KEY]));
upcall->key_len = nl_attr_get_size(a[OVS_PACKET_ATTR_KEY]);
upcall->userdata = a[OVS_PACKET_ATTR_USERDATA];
/* Allow overwriting the netlink attribute header without reallocating. */
ofpbuf_use_stub(&upcall->packet,
CONST_CAST(struct nlattr *,
nl_attr_get(a[OVS_PACKET_ATTR_PACKET])) - 1,
nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]) +
sizeof(struct nlattr));
upcall->packet.data = (char *)upcall->packet.data + sizeof(struct nlattr);
upcall->packet.size = nl_attr_get_size(a[OVS_PACKET_ATTR_PACKET]);
*dp_ifindex = ovs_header->dp_ifindex;
return 0;
}
static int
dpif_linux_recv__(struct dpif *dpif_, struct dpif_upcall *upcall,
struct ofpbuf *buf)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int read_tries = 0;
if (dpif->epoll_fd < 0) {
return EAGAIN;
}
if (dpif->event_offset >= dpif->n_events) {
int retval;
dpif->event_offset = dpif->n_events = 0;
do {
retval = epoll_wait(dpif->epoll_fd, dpif->epoll_events,
dpif->uc_array_size, 0);
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 1);
VLOG_WARN_RL(&rl, "epoll_wait failed (%s)", ovs_strerror(errno));
} else if (retval > 0) {
dpif->n_events = retval;
}
}
while (dpif->event_offset < dpif->n_events) {
int idx = dpif->epoll_events[dpif->event_offset].data.u32;
struct dpif_channel *ch = &dpif->channels[idx];
dpif->event_offset++;
for (;;) {
int dp_ifindex;
int error;
if (++read_tries > 50) {
return EAGAIN;
}
error = nl_sock_recv(ch->sock, buf, false);
if (error == ENOBUFS) {
/* ENOBUFS typically means that we've received so many
* packets that the buffer overflowed. Try again
* immediately because there's almost certainly a packet
* waiting for us. */
report_loss(dpif_, ch);
continue;
}
ch->last_poll = time_msec();
if (error) {
if (error == EAGAIN) {
break;
}
return error;
}
error = parse_odp_packet(buf, upcall, &dp_ifindex);
if (!error && dp_ifindex == dpif->dp_ifindex) {
return 0;
} else if (error) {
return error;
}
}
}
return EAGAIN;
}
static int
dpif_linux_recv(struct dpif *dpif_, struct dpif_upcall *upcall,
struct ofpbuf *buf)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
int error;
ovs_mutex_lock(&dpif->upcall_lock);
error = dpif_linux_recv__(dpif_, upcall, buf);
ovs_mutex_unlock(&dpif->upcall_lock);
return error;
}
static void
dpif_linux_recv_wait(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
ovs_mutex_lock(&dpif->upcall_lock);
if (dpif->epoll_fd >= 0) {
poll_fd_wait(dpif->epoll_fd, POLLIN);
}
ovs_mutex_unlock(&dpif->upcall_lock);
}
static void
dpif_linux_recv_purge(struct dpif *dpif_)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
ovs_mutex_lock(&dpif->upcall_lock);
if (dpif->epoll_fd >= 0) {
struct dpif_channel *ch;
for (ch = dpif->channels; ch < &dpif->channels[dpif->uc_array_size];
ch++) {
if (ch->sock) {
nl_sock_drain(ch->sock);
}
}
}
ovs_mutex_unlock(&dpif->upcall_lock);
}
const struct dpif_class dpif_linux_class = {
"system",
dpif_linux_enumerate,
NULL,
dpif_linux_open,
dpif_linux_close,
dpif_linux_destroy,
dpif_linux_run,
NULL, /* wait */
dpif_linux_get_stats,
dpif_linux_port_add,
dpif_linux_port_del,
dpif_linux_port_query_by_number,
dpif_linux_port_query_by_name,
dpif_linux_get_max_ports,
dpif_linux_port_get_pid,
dpif_linux_port_dump_start,
dpif_linux_port_dump_next,
dpif_linux_port_dump_done,
dpif_linux_port_poll,
dpif_linux_port_poll_wait,
dpif_linux_flow_get,
dpif_linux_flow_put,
dpif_linux_flow_del,
dpif_linux_flow_flush,
dpif_linux_flow_dump_start,
dpif_linux_flow_dump_next,
dpif_linux_flow_dump_done,
dpif_linux_execute,
dpif_linux_operate,
dpif_linux_recv_set,
dpif_linux_queue_to_priority,
dpif_linux_recv,
dpif_linux_recv_wait,
dpif_linux_recv_purge,
};
static int
dpif_linux_init(void)
{
static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
static int error;
if (ovsthread_once_start(&once)) {
error = nl_lookup_genl_family(OVS_DATAPATH_FAMILY,
&ovs_datapath_family);
if (error) {
VLOG_ERR("Generic Netlink family '%s' does not exist. "
"The Open vSwitch kernel module is probably not loaded.",
OVS_DATAPATH_FAMILY);
}
if (!error) {
error = nl_lookup_genl_family(OVS_VPORT_FAMILY, &ovs_vport_family);
}
if (!error) {
error = nl_lookup_genl_family(OVS_FLOW_FAMILY, &ovs_flow_family);
}
if (!error) {
error = nl_lookup_genl_family(OVS_PACKET_FAMILY,
&ovs_packet_family);
}
if (!error) {
error = nl_lookup_genl_mcgroup(OVS_VPORT_FAMILY, OVS_VPORT_MCGROUP,
&ovs_vport_mcgroup);
}
ovsthread_once_done(&once);
}
return error;
}
bool
dpif_linux_is_internal_device(const char *name)
{
struct dpif_linux_vport reply;
struct ofpbuf *buf;
int error;
error = dpif_linux_vport_get(name, &reply, &buf);
if (!error) {
ofpbuf_delete(buf);
} else if (error != ENODEV && error != ENOENT) {
VLOG_WARN_RL(&error_rl, "%s: vport query failed (%s)",
name, ovs_strerror(error));
}
return reply.type == OVS_VPORT_TYPE_INTERNAL;
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" followed
* by Netlink attributes, into 'vport'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'vport' will contain pointers into 'buf', so the caller should not free
* 'buf' while 'vport' is still in use. */
static int
dpif_linux_vport_from_ofpbuf(struct dpif_linux_vport *vport,
const struct ofpbuf *buf)
{
static const struct nl_policy ovs_vport_policy[] = {
[OVS_VPORT_ATTR_PORT_NO] = { .type = NL_A_U32 },
[OVS_VPORT_ATTR_TYPE] = { .type = NL_A_U32 },
[OVS_VPORT_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NL_A_U32 },
[OVS_VPORT_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_vport_stats),
.optional = true },
[OVS_VPORT_ATTR_OPTIONS] = { .type = NL_A_NESTED, .optional = true },
};
struct nlattr *a[ARRAY_SIZE(ovs_vport_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_vport_init(vport);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_vport_family
|| !nl_policy_parse(&b, 0, ovs_vport_policy, a,
ARRAY_SIZE(ovs_vport_policy))) {
return EINVAL;
}
vport->cmd = genl->cmd;
vport->dp_ifindex = ovs_header->dp_ifindex;
vport->port_no = nl_attr_get_odp_port(a[OVS_VPORT_ATTR_PORT_NO]);
vport->type = nl_attr_get_u32(a[OVS_VPORT_ATTR_TYPE]);
vport->name = nl_attr_get_string(a[OVS_VPORT_ATTR_NAME]);
if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
vport->upcall_pid = nl_attr_get(a[OVS_VPORT_ATTR_UPCALL_PID]);
}
if (a[OVS_VPORT_ATTR_STATS]) {
vport->stats = nl_attr_get(a[OVS_VPORT_ATTR_STATS]);
}
if (a[OVS_VPORT_ATTR_OPTIONS]) {
vport->options = nl_attr_get(a[OVS_VPORT_ATTR_OPTIONS]);
vport->options_len = nl_attr_get_size(a[OVS_VPORT_ATTR_OPTIONS]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'vport'. */
static void
dpif_linux_vport_to_ofpbuf(const struct dpif_linux_vport *vport,
struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_vport_family, NLM_F_REQUEST | NLM_F_ECHO,
vport->cmd, OVS_VPORT_VERSION);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = vport->dp_ifindex;
if (vport->port_no != ODPP_NONE) {
nl_msg_put_odp_port(buf, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
}
if (vport->type != OVS_VPORT_TYPE_UNSPEC) {
nl_msg_put_u32(buf, OVS_VPORT_ATTR_TYPE, vport->type);
}
if (vport->name) {
nl_msg_put_string(buf, OVS_VPORT_ATTR_NAME, vport->name);
}
if (vport->upcall_pid) {
nl_msg_put_u32(buf, OVS_VPORT_ATTR_UPCALL_PID, *vport->upcall_pid);
}
if (vport->stats) {
nl_msg_put_unspec(buf, OVS_VPORT_ATTR_STATS,
vport->stats, sizeof *vport->stats);
}
if (vport->options) {
nl_msg_put_nested(buf, OVS_VPORT_ATTR_OPTIONS,
vport->options, vport->options_len);
}
}
/* Clears 'vport' to "empty" values. */
void
dpif_linux_vport_init(struct dpif_linux_vport *vport)
{
memset(vport, 0, sizeof *vport);
vport->port_no = ODPP_NONE;
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be an ovs_vport also, which is decoded
* and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
* reply is no longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_vport_transact(const struct dpif_linux_vport *request,
struct dpif_linux_vport *reply,
struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
error = dpif_linux_init();
if (error) {
if (reply) {
*bufp = NULL;
dpif_linux_vport_init(reply);
}
return error;
}
request_buf = ofpbuf_new(1024);
dpif_linux_vport_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_linux_vport_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_linux_vport_init(reply);
ofpbuf_delete(*bufp);
*bufp = NULL;
}
}
return error;
}
/* Obtains information about the kernel vport named 'name' and stores it into
* '*reply' and '*bufp'. The caller must free '*bufp' when the reply is no
* longer needed ('reply' will contain pointers into '*bufp'). */
int
dpif_linux_vport_get(const char *name, struct dpif_linux_vport *reply,
struct ofpbuf **bufp)
{
struct dpif_linux_vport request;
dpif_linux_vport_init(&request);
request.cmd = OVS_VPORT_CMD_GET;
request.name = name;
return dpif_linux_vport_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" followed
* by Netlink attributes, into 'dp'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'dp' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'dp' is still in use. */
static int
dpif_linux_dp_from_ofpbuf(struct dpif_linux_dp *dp, const struct ofpbuf *buf)
{
static const struct nl_policy ovs_datapath_policy[] = {
[OVS_DP_ATTR_NAME] = { .type = NL_A_STRING, .max_len = IFNAMSIZ },
[OVS_DP_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_dp_stats),
.optional = true },
[OVS_DP_ATTR_MEGAFLOW_STATS] = {
NL_POLICY_FOR(struct ovs_dp_megaflow_stats),
.optional = true },
};
struct nlattr *a[ARRAY_SIZE(ovs_datapath_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_dp_init(dp);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_datapath_family
|| !nl_policy_parse(&b, 0, ovs_datapath_policy, a,
ARRAY_SIZE(ovs_datapath_policy))) {
return EINVAL;
}
dp->cmd = genl->cmd;
dp->dp_ifindex = ovs_header->dp_ifindex;
dp->name = nl_attr_get_string(a[OVS_DP_ATTR_NAME]);
if (a[OVS_DP_ATTR_STATS]) {
/* Can't use structure assignment because Netlink doesn't ensure
* sufficient alignment for 64-bit members. */
memcpy(&dp->stats, nl_attr_get(a[OVS_DP_ATTR_STATS]),
sizeof dp->stats);
}
if (a[OVS_DP_ATTR_MEGAFLOW_STATS]) {
/* Can't use structure assignment because Netlink doesn't ensure
* sufficient alignment for 64-bit members. */
memcpy(&dp->megaflow_stats, nl_attr_get(a[OVS_DP_ATTR_MEGAFLOW_STATS]),
sizeof dp->megaflow_stats);
}
return 0;
}
/* Appends to 'buf' the Generic Netlink message described by 'dp'. */
static void
dpif_linux_dp_to_ofpbuf(const struct dpif_linux_dp *dp, struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_datapath_family,
NLM_F_REQUEST | NLM_F_ECHO, dp->cmd,
OVS_DATAPATH_VERSION);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = dp->dp_ifindex;
if (dp->name) {
nl_msg_put_string(buf, OVS_DP_ATTR_NAME, dp->name);
}
if (dp->upcall_pid) {
nl_msg_put_u32(buf, OVS_DP_ATTR_UPCALL_PID, *dp->upcall_pid);
}
/* Skip OVS_DP_ATTR_STATS since we never have a reason to serialize it. */
}
/* Clears 'dp' to "empty" values. */
static void
dpif_linux_dp_init(struct dpif_linux_dp *dp)
{
memset(dp, 0, sizeof *dp);
dp->megaflow_stats.n_masks = UINT32_MAX;
dp->megaflow_stats.n_mask_hit = UINT64_MAX;
}
static void
dpif_linux_dp_dump_start(struct nl_dump *dump)
{
struct dpif_linux_dp request;
struct ofpbuf *buf;
dpif_linux_dp_init(&request);
request.cmd = OVS_DP_CMD_GET;
buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(&request, buf);
nl_dump_start(dump, NETLINK_GENERIC, buf);
ofpbuf_delete(buf);
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be of the same form, which is decoded
* and stored in '*reply' and '*bufp'. The caller must free '*bufp' when the
* reply is no longer needed ('reply' will contain pointers into '*bufp'). */
static int
dpif_linux_dp_transact(const struct dpif_linux_dp *request,
struct dpif_linux_dp *reply, struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
request_buf = ofpbuf_new(1024);
dpif_linux_dp_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
dpif_linux_dp_init(reply);
if (!error) {
error = dpif_linux_dp_from_ofpbuf(reply, *bufp);
}
if (error) {
ofpbuf_delete(*bufp);
*bufp = NULL;
}
}
return error;
}
/* Obtains information about 'dpif_' and stores it into '*reply' and '*bufp'.
* The caller must free '*bufp' when the reply is no longer needed ('reply'
* will contain pointers into '*bufp'). */
static int
dpif_linux_dp_get(const struct dpif *dpif_, struct dpif_linux_dp *reply,
struct ofpbuf **bufp)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
struct dpif_linux_dp request;
dpif_linux_dp_init(&request);
request.cmd = OVS_DP_CMD_GET;
request.dp_ifindex = dpif->dp_ifindex;
return dpif_linux_dp_transact(&request, reply, bufp);
}
/* Parses the contents of 'buf', which contains a "struct ovs_header" followed
* by Netlink attributes, into 'flow'. Returns 0 if successful, otherwise a
* positive errno value.
*
* 'flow' will contain pointers into 'buf', so the caller should not free 'buf'
* while 'flow' is still in use. */
static int
dpif_linux_flow_from_ofpbuf(struct dpif_linux_flow *flow,
const struct ofpbuf *buf)
{
static const struct nl_policy ovs_flow_policy[] = {
[OVS_FLOW_ATTR_KEY] = { .type = NL_A_NESTED },
[OVS_FLOW_ATTR_MASK] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_ACTIONS] = { .type = NL_A_NESTED, .optional = true },
[OVS_FLOW_ATTR_STATS] = { NL_POLICY_FOR(struct ovs_flow_stats),
.optional = true },
[OVS_FLOW_ATTR_TCP_FLAGS] = { .type = NL_A_U8, .optional = true },
[OVS_FLOW_ATTR_USED] = { .type = NL_A_U64, .optional = true },
/* The kernel never uses OVS_FLOW_ATTR_CLEAR. */
};
struct nlattr *a[ARRAY_SIZE(ovs_flow_policy)];
struct ovs_header *ovs_header;
struct nlmsghdr *nlmsg;
struct genlmsghdr *genl;
struct ofpbuf b;
dpif_linux_flow_init(flow);
ofpbuf_use_const(&b, buf->data, buf->size);
nlmsg = ofpbuf_try_pull(&b, sizeof *nlmsg);
genl = ofpbuf_try_pull(&b, sizeof *genl);
ovs_header = ofpbuf_try_pull(&b, sizeof *ovs_header);
if (!nlmsg || !genl || !ovs_header
|| nlmsg->nlmsg_type != ovs_flow_family
|| !nl_policy_parse(&b, 0, ovs_flow_policy, a,
ARRAY_SIZE(ovs_flow_policy))) {
return EINVAL;
}
flow->nlmsg_flags = nlmsg->nlmsg_flags;
flow->dp_ifindex = ovs_header->dp_ifindex;
flow->key = nl_attr_get(a[OVS_FLOW_ATTR_KEY]);
flow->key_len = nl_attr_get_size(a[OVS_FLOW_ATTR_KEY]);
if (a[OVS_FLOW_ATTR_MASK]) {
flow->mask = nl_attr_get(a[OVS_FLOW_ATTR_MASK]);
flow->mask_len = nl_attr_get_size(a[OVS_FLOW_ATTR_MASK]);
}
if (a[OVS_FLOW_ATTR_ACTIONS]) {
flow->actions = nl_attr_get(a[OVS_FLOW_ATTR_ACTIONS]);
flow->actions_len = nl_attr_get_size(a[OVS_FLOW_ATTR_ACTIONS]);
}
if (a[OVS_FLOW_ATTR_STATS]) {
flow->stats = nl_attr_get(a[OVS_FLOW_ATTR_STATS]);
}
if (a[OVS_FLOW_ATTR_TCP_FLAGS]) {
flow->tcp_flags = nl_attr_get(a[OVS_FLOW_ATTR_TCP_FLAGS]);
}
if (a[OVS_FLOW_ATTR_USED]) {
flow->used = nl_attr_get(a[OVS_FLOW_ATTR_USED]);
}
return 0;
}
/* Appends to 'buf' (which must initially be empty) a "struct ovs_header"
* followed by Netlink attributes corresponding to 'flow'. */
static void
dpif_linux_flow_to_ofpbuf(const struct dpif_linux_flow *flow,
struct ofpbuf *buf)
{
struct ovs_header *ovs_header;
nl_msg_put_genlmsghdr(buf, 0, ovs_flow_family,
NLM_F_REQUEST | flow->nlmsg_flags,
flow->cmd, OVS_FLOW_VERSION);
ovs_header = ofpbuf_put_uninit(buf, sizeof *ovs_header);
ovs_header->dp_ifindex = flow->dp_ifindex;
if (flow->key_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_KEY, flow->key, flow->key_len);
}
if (flow->mask_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_MASK, flow->mask, flow->mask_len);
}
if (flow->actions || flow->actions_len) {
nl_msg_put_unspec(buf, OVS_FLOW_ATTR_ACTIONS,
flow->actions, flow->actions_len);
}
/* We never need to send these to the kernel. */
ovs_assert(!flow->stats);
ovs_assert(!flow->tcp_flags);
ovs_assert(!flow->used);
if (flow->clear) {
nl_msg_put_flag(buf, OVS_FLOW_ATTR_CLEAR);
}
}
/* Clears 'flow' to "empty" values. */
static void
dpif_linux_flow_init(struct dpif_linux_flow *flow)
{
memset(flow, 0, sizeof *flow);
}
/* Executes 'request' in the kernel datapath. If the command fails, returns a
* positive errno value. Otherwise, if 'reply' and 'bufp' are null, returns 0
* without doing anything else. If 'reply' and 'bufp' are nonnull, then the
* result of the command is expected to be a flow also, which is decoded and
* stored in '*reply' and '*bufp'. The caller must free '*bufp' when the reply
* is no longer needed ('reply' will contain pointers into '*bufp'). */
static int
dpif_linux_flow_transact(struct dpif_linux_flow *request,
struct dpif_linux_flow *reply, struct ofpbuf **bufp)
{
struct ofpbuf *request_buf;
int error;
ovs_assert((reply != NULL) == (bufp != NULL));
if (reply) {
request->nlmsg_flags |= NLM_F_ECHO;
}
request_buf = ofpbuf_new(1024);
dpif_linux_flow_to_ofpbuf(request, request_buf);
error = nl_transact(NETLINK_GENERIC, request_buf, bufp);
ofpbuf_delete(request_buf);
if (reply) {
if (!error) {
error = dpif_linux_flow_from_ofpbuf(reply, *bufp);
}
if (error) {
dpif_linux_flow_init(reply);
ofpbuf_delete(*bufp);
*bufp = NULL;
}
}
return error;
}
static void
dpif_linux_flow_get_stats(const struct dpif_linux_flow *flow,
struct dpif_flow_stats *stats)
{
if (flow->stats) {
stats->n_packets = get_unaligned_u64(&flow->stats->n_packets);
stats->n_bytes = get_unaligned_u64(&flow->stats->n_bytes);
} else {
stats->n_packets = 0;
stats->n_bytes = 0;
}
stats->used = flow->used ? get_32aligned_u64(flow->used) : 0;
stats->tcp_flags = flow->tcp_flags ? *flow->tcp_flags : 0;
}
/* Logs information about a packet that was recently lost in 'ch' (in
* 'dpif_'). */
static void
report_loss(struct dpif *dpif_, struct dpif_channel *ch)
{
struct dpif_linux *dpif = dpif_linux_cast(dpif_);
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
struct ds s;
if (VLOG_DROP_WARN(&rl)) {
return;
}
ds_init(&s);
if (ch->last_poll != LLONG_MIN) {
ds_put_format(&s, " (last polled %lld ms ago)",
time_msec() - ch->last_poll);
}
VLOG_WARN("%s: lost packet on channel %"PRIdPTR"%s",
dpif_name(dpif_), ch - dpif->channels, ds_cstr(&s));
ds_destroy(&s);
}
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