/*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include "ofpbuf.h"
#include "packets.h"
#include "poll-loop.h"
+#include "svec.h"
#include "util.h"
#include "valgrind.h"
#include "vlog.h"
#define THIS_MODULE VLM_dpif
-static struct dpif_class *dpif_classes[] = {
+static const struct dpif_class *dpif_classes[] = {
&dpif_linux_class,
+ &dpif_netdev_class,
};
enum { N_DPIF_CLASSES = ARRAY_SIZE(dpif_classes) };
/* Performs periodic work needed by all the various kinds of dpifs.
*
- * If your program opens any dpifs, it must call this function within its main
- * poll loop. */
+ * If your program opens any dpifs, it must call both this function and
+ * netdev_run() within its main poll loop. */
void
dp_run(void)
{
/* Arranges for poll_block() to wake up when dp_run() needs to be called.
*
- * If your program opens any dpifs, it must call this function within its main
- * poll loop. */
+ * If your program opens any dpifs, it must call both this function and
+ * netdev_wait() within its main poll loop. */
void
dp_wait(void)
{
}
}
+/* Clears 'all_dps' and enumerates the names of all known created datapaths,
+ * where possible, into it. The caller must first initialize 'all_dps'.
+ * Returns 0 if successful, otherwise a positive errno value.
+ *
+ * Some kinds of datapaths might not be practically enumerable. This is not
+ * considered an error. */
+int
+dp_enumerate(struct svec *all_dps)
+{
+ int error;
+ int i;
+
+ svec_clear(all_dps);
+ error = 0;
+ for (i = 0; i < N_DPIF_CLASSES; i++) {
+ const struct dpif_class *class = dpif_classes[i];
+ int retval = class->enumerate ? class->enumerate(all_dps) : 0;
+ if (retval) {
+ VLOG_WARN("failed to enumerate %s datapaths: %s",
+ class->name, strerror(retval));
+ if (!error) {
+ error = retval;
+ }
+ }
+ }
+ return error;
+}
+
static int
do_open(const char *name_, bool create, struct dpif **dpifp)
{
/* Tries to create and open a new datapath with the given 'name'. Will fail if
* a datapath named 'name' already exists. Returns 0 if successful, otherwise
* a positive errno value. On success stores a pointer to the datapath in
- * '*dpifp', otherwise a null pointer.*/
+ * '*dpifp', otherwise a null pointer. */
int
dpif_create(const char *name, struct dpif **dpifp)
{
return do_open(name, true, dpifp);
}
+/* Tries to open a datapath with the given 'name', creating it if it does not
+ * exist. Returns 0 if successful, otherwise a positive errno value. On
+ * success stores a pointer to the datapath in '*dpifp', otherwise a null
+ * pointer. */
+int
+dpif_create_and_open(const char *name, struct dpif **dpifp)
+{
+ int error;
+
+ error = dpif_create(name, dpifp);
+ if (error == EEXIST || error == EBUSY) {
+ error = dpif_open(name, dpifp);
+ if (error) {
+ VLOG_WARN("datapath %s already exists but cannot be opened: %s",
+ name, strerror(error));
+ }
+ } else if (error) {
+ VLOG_WARN("failed to create datapath %s: %s", name, strerror(error));
+ }
+ return error;
+}
+
/* Closes and frees the connection to 'dpif'. Does not destroy the datapath
* itself; call dpif_delete() first, instead, if that is desirable. */
void
{
if (dpif) {
char *name = dpif->name;
- dpif->class->close(dpif);
+ dpif->dpif_class->close(dpif);
free(name);
}
}
return dpif->name;
}
+/* Enumerates all names that may be used to open 'dpif' into 'all_names'. The
+ * Linux datapath, for example, supports opening a datapath both by number,
+ * e.g. "dp0", and by the name of the datapath's local port. For some
+ * datapaths, this might be an infinite set (e.g. in a file name, slashes may
+ * be duplicated any number of times), in which case only the names most likely
+ * to be used will be enumerated.
+ *
+ * The caller must already have initialized 'all_names'. Any existing names in
+ * 'all_names' will not be disturbed. */
+int
+dpif_get_all_names(const struct dpif *dpif, struct svec *all_names)
+{
+ if (dpif->dpif_class->get_all_names) {
+ int error = dpif->dpif_class->get_all_names(dpif, all_names);
+ if (error) {
+ VLOG_WARN_RL(&error_rl,
+ "failed to retrieve names for datpath %s: %s",
+ dpif_name(dpif), strerror(error));
+ }
+ return error;
+ } else {
+ svec_add(all_names, dpif_name(dpif));
+ return 0;
+ }
+}
+
/* Destroys the datapath that 'dpif' is connected to, first removing all of its
* ports. After calling this function, it does not make sense to pass 'dpif'
* to any functions other than dpif_name() or dpif_close(). */
COVERAGE_INC(dpif_destroy);
- error = dpif->class->delete(dpif);
+ error = dpif->dpif_class->destroy(dpif);
log_operation(dpif, "delete", error);
return error;
}
int
dpif_get_dp_stats(const struct dpif *dpif, struct odp_stats *stats)
{
- int error = dpif->class->get_stats(dpif, stats);
+ int error = dpif->dpif_class->get_stats(dpif, stats);
if (error) {
memset(stats, 0, sizeof *stats);
}
int
dpif_get_drop_frags(const struct dpif *dpif, bool *drop_frags)
{
- int error = dpif->class->get_drop_frags(dpif, drop_frags);
+ int error = dpif->dpif_class->get_drop_frags(dpif, drop_frags);
if (error) {
*drop_frags = false;
}
int
dpif_set_drop_frags(struct dpif *dpif, bool drop_frags)
{
- int error = dpif->class->set_drop_frags(dpif, drop_frags);
+ int error = dpif->dpif_class->set_drop_frags(dpif, drop_frags);
log_operation(dpif, "set_drop_frags", error);
return error;
}
COVERAGE_INC(dpif_port_add);
- error = dpif->class->port_add(dpif, devname, flags, &port_no);
+ error = dpif->dpif_class->port_add(dpif, devname, flags, &port_no);
if (!error) {
VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu16,
dpif_name(dpif), devname, port_no);
COVERAGE_INC(dpif_port_del);
- error = dpif->class->port_del(dpif, port_no);
+ error = dpif->dpif_class->port_del(dpif, port_no);
log_operation(dpif, "port_del", error);
return error;
}
dpif_port_query_by_number(const struct dpif *dpif, uint16_t port_no,
struct odp_port *port)
{
- int error = dpif->class->port_query_by_number(dpif, port_no, port);
+ int error = dpif->dpif_class->port_query_by_number(dpif, port_no, port);
if (!error) {
VLOG_DBG_RL(&dpmsg_rl, "%s: port %"PRIu16" is device %s",
dpif_name(dpif), port_no, port->devname);
dpif_port_query_by_name(const struct dpif *dpif, const char *devname,
struct odp_port *port)
{
- int error = dpif->class->port_query_by_name(dpif, devname, port);
+ int error = dpif->dpif_class->port_query_by_name(dpif, devname, port);
if (!error) {
VLOG_DBG_RL(&dpmsg_rl, "%s: device %s is on port %"PRIu16,
dpif_name(dpif), devname, port->port);
struct odp_port **portsp, size_t *n_portsp)
{
struct odp_port *ports;
- size_t n_ports;
+ size_t n_ports = 0;
int error;
for (;;) {
}
ports = xcalloc(stats.n_ports, sizeof *ports);
- retval = dpif->class->port_list(dpif, ports, stats.n_ports);
+ retval = dpif->dpif_class->port_list(dpif, ports, stats.n_ports);
if (retval < 0) {
/* Hard error. */
error = -retval;
return error;
}
+/* Polls for changes in the set of ports in 'dpif'. If the set of ports in
+ * 'dpif' has changed, this function does one of the following:
+ *
+ * - Stores the name of the device that was added to or deleted from 'dpif' in
+ * '*devnamep' and returns 0. The caller is responsible for freeing
+ * '*devnamep' (with free()) when it no longer needs it.
+ *
+ * - Returns ENOBUFS and sets '*devnamep' to NULL.
+ *
+ * This function may also return 'false positives', where it returns 0 and
+ * '*devnamep' names a device that was not actually added or deleted or it
+ * returns ENOBUFS without any change.
+ *
+ * Returns EAGAIN if the set of ports in 'dpif' has not changed. May also
+ * return other positive errno values to indicate that something has gone
+ * wrong. */
+int
+dpif_port_poll(const struct dpif *dpif, char **devnamep)
+{
+ int error = dpif->dpif_class->port_poll(dpif, devnamep);
+ if (error) {
+ *devnamep = NULL;
+ }
+ return error;
+}
+
+/* Arranges for the poll loop to wake up when port_poll(dpif) will return a
+ * value other than EAGAIN. */
+void
+dpif_port_poll_wait(const struct dpif *dpif)
+{
+ dpif->dpif_class->port_poll_wait(dpif);
+}
+
/* Retrieves a list of the port numbers in port group 'group' in 'dpif'.
*
* On success, returns 0 and points '*ports' to a newly allocated array of
*ports = NULL;
*n_ports = 0;
for (;;) {
- int retval = dpif->class->port_group_get(dpif, group,
- *ports, *n_ports);
+ int retval = dpif->dpif_class->port_group_get(dpif, group,
+ *ports, *n_ports);
if (retval < 0) {
/* Hard error. */
error = -retval;
COVERAGE_INC(dpif_port_group_set);
- error = dpif->class->port_group_set(dpif, group, ports, n_ports);
+ error = dpif->dpif_class->port_group_set(dpif, group, ports, n_ports);
log_operation(dpif, "port_group_set", error);
return error;
}
COVERAGE_INC(dpif_flow_flush);
- error = dpif->class->flow_flush(dpif);
+ error = dpif->dpif_class->flow_flush(dpif);
log_operation(dpif, "flow_flush", error);
return error;
}
COVERAGE_INC(dpif_flow_get);
check_rw_odp_flow(flow);
- error = dpif->class->flow_get(dpif, flow, 1);
+ error = dpif->dpif_class->flow_get(dpif, flow, 1);
if (!error) {
error = flow->stats.error;
}
check_rw_odp_flow(&flows[i]);
}
- error = dpif->class->flow_get(dpif, flows, n);
+ error = dpif->dpif_class->flow_get(dpif, flows, n);
log_operation(dpif, "flow_get_multiple", error);
return error;
}
COVERAGE_INC(dpif_flow_put);
- error = dpif->class->flow_put(dpif, put);
+ error = dpif->dpif_class->flow_put(dpif, put);
if (should_log_flow_message(error)) {
log_flow_put(dpif, error, put);
}
check_rw_odp_flow(flow);
memset(&flow->stats, 0, sizeof flow->stats);
- error = dpif->class->flow_del(dpif, flow);
+ error = dpif->dpif_class->flow_del(dpif, flow);
if (should_log_flow_message(error)) {
log_flow_operation(dpif, "delete flow", error, flow);
}
flows[i].n_actions = 0;
}
}
- retval = dpif->class->flow_list(dpif, flows, n);
+ retval = dpif->dpif_class->flow_list(dpif, flows, n);
if (retval < 0) {
*n_out = 0;
VLOG_WARN_RL(&error_rl, "%s: flow list failed (%s)",
COVERAGE_INC(dpif_execute);
if (n_actions > 0) {
- error = dpif->class->execute(dpif, in_port, actions, n_actions, buf);
+ error = dpif->dpif_class->execute(dpif, in_port, actions,
+ n_actions, buf);
} else {
error = 0;
}
int
dpif_recv_get_mask(const struct dpif *dpif, int *listen_mask)
{
- int error = dpif->class->recv_get_mask(dpif, listen_mask);
+ int error = dpif->dpif_class->recv_get_mask(dpif, listen_mask);
if (error) {
*listen_mask = 0;
}
int
dpif_recv_set_mask(struct dpif *dpif, int listen_mask)
{
- int error = dpif->class->recv_set_mask(dpif, listen_mask);
+ int error = dpif->dpif_class->recv_set_mask(dpif, listen_mask);
log_operation(dpif, "recv_set_mask", error);
return error;
}
+/* Retrieve the sFlow sampling probability. '*probability' is expressed as the
+ * number of packets out of UINT_MAX to sample, e.g. probability/UINT_MAX is
+ * the probability of sampling a given packet.
+ *
+ * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
+ * indicates that 'dpif' does not support sFlow sampling. */
+int
+dpif_get_sflow_probability(const struct dpif *dpif, uint32_t *probability)
+{
+ int error = (dpif->dpif_class->get_sflow_probability
+ ? dpif->dpif_class->get_sflow_probability(dpif, probability)
+ : EOPNOTSUPP);
+ if (error) {
+ *probability = 0;
+ }
+ log_operation(dpif, "get_sflow_probability", error);
+ return error;
+}
+
+/* Set the sFlow sampling probability. 'probability' is expressed as the
+ * number of packets out of UINT_MAX to sample, e.g. probability/UINT_MAX is
+ * the probability of sampling a given packet.
+ *
+ * Returns 0 if successful, otherwise a positive errno value. EOPNOTSUPP
+ * indicates that 'dpif' does not support sFlow sampling. */
+int
+dpif_set_sflow_probability(struct dpif *dpif, uint32_t probability)
+{
+ int error = (dpif->dpif_class->set_sflow_probability
+ ? dpif->dpif_class->set_sflow_probability(dpif, probability)
+ : EOPNOTSUPP);
+ log_operation(dpif, "set_sflow_probability", error);
+ return error;
+}
+
/* Attempts to receive a message from 'dpif'. If successful, stores the
* message into '*packetp'. The message, if one is received, will begin with
* 'struct odp_msg' as a header. Only messages of the types selected with
int
dpif_recv(struct dpif *dpif, struct ofpbuf **packetp)
{
- int error = dpif->class->recv(dpif, packetp);
+ int error = dpif->dpif_class->recv(dpif, packetp);
if (!error) {
if (VLOG_IS_DBG_ENABLED()) {
struct ofpbuf *buf = *packetp;
"%zu on port %"PRIu16": %s", dpif_name(dpif),
(msg->type == _ODPL_MISS_NR ? "miss"
: msg->type == _ODPL_ACTION_NR ? "action"
+ : msg->type == _ODPL_SFLOW_NR ? "sFlow"
: "<unknown>"),
payload_len, msg->port, s);
free(s);
return error;
}
- for (i = 0; i < stats.max_miss_queue + stats.max_action_queue; i++) {
+ for (i = 0; i < stats.max_miss_queue + stats.max_action_queue + stats.max_sflow_queue; i++) {
struct ofpbuf *buf;
error = dpif_recv(dpif, &buf);
if (error) {
void
dpif_recv_wait(struct dpif *dpif)
{
- dpif->class->recv_wait(dpif);
+ dpif->dpif_class->recv_wait(dpif);
}
/* Obtains the NetFlow engine type and engine ID for 'dpif' into '*engine_type'
}
\f
void
-dpif_init(struct dpif *dpif, const struct dpif_class *class, const char *name,
+dpif_init(struct dpif *dpif, const struct dpif_class *dpif_class,
+ const char *name,
uint8_t netflow_engine_type, uint8_t netflow_engine_id)
{
- dpif->class = class;
+ dpif->dpif_class = dpif_class;
dpif->name = xstrdup(name);
dpif->netflow_engine_type = netflow_engine_type;
dpif->netflow_engine_id = netflow_engine_id;
memset(&flow->actions[0], 0xcc, sizeof flow->actions[0]);
}
}
-\f
-#include <net/if.h>
-#include <linux/rtnetlink.h>
-#include <linux/ethtool.h>
-#include <linux/sockios.h>
-#include <netinet/in.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/sysmacros.h>
-#include <unistd.h>
-
-struct dpifmon {
- struct dpif *dpif;
- struct nl_sock *sock;
- int local_ifindex;
-};
-
-int
-dpifmon_create(const char *datapath_name, struct dpifmon **monp)
-{
- struct dpifmon *mon;
- char local_name[IFNAMSIZ];
- int error;
-
- mon = *monp = xmalloc(sizeof *mon);
-
- error = dpif_open(datapath_name, &mon->dpif);
- if (error) {
- goto error;
- }
- error = dpif_port_get_name(mon->dpif, ODPP_LOCAL,
- local_name, sizeof local_name);
- if (error) {
- goto error_close_dpif;
- }
-
- mon->local_ifindex = if_nametoindex(local_name);
- if (!mon->local_ifindex) {
- error = errno;
- VLOG_WARN("could not get ifindex of %s device: %s",
- local_name, strerror(errno));
- goto error_close_dpif;
- }
-
- error = nl_sock_create(NETLINK_ROUTE, RTNLGRP_LINK, 0, 0, &mon->sock);
- if (error) {
- VLOG_WARN("could not create rtnetlink socket: %s", strerror(error));
- goto error_close_dpif;
- }
-
- return 0;
-
-error_close_dpif:
- dpif_close(mon->dpif);
-error:
- free(mon);
- *monp = NULL;
- return error;
-}
-
-void
-dpifmon_destroy(struct dpifmon *mon)
-{
- if (mon) {
- dpif_close(mon->dpif);
- nl_sock_destroy(mon->sock);
- }
-}
-
-int
-dpifmon_poll(struct dpifmon *mon, char **devnamep)
-{
- static struct vlog_rate_limit slow_rl = VLOG_RATE_LIMIT_INIT(1, 5);
- static const struct nl_policy rtnlgrp_link_policy[] = {
- [IFLA_IFNAME] = { .type = NL_A_STRING },
- [IFLA_MASTER] = { .type = NL_A_U32, .optional = true },
- };
- struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
- struct ofpbuf *buf;
- int error;
-
- *devnamep = NULL;
-again:
- error = nl_sock_recv(mon->sock, &buf, false);
- switch (error) {
- case 0:
- if (!nl_policy_parse(buf, NLMSG_HDRLEN + sizeof(struct ifinfomsg),
- rtnlgrp_link_policy,
- attrs, ARRAY_SIZE(rtnlgrp_link_policy))) {
- VLOG_WARN_RL(&slow_rl, "received bad rtnl message");
- error = ENOBUFS;
- } else {
- const char *devname = nl_attr_get_string(attrs[IFLA_IFNAME]);
- bool for_us;
-
- if (attrs[IFLA_MASTER]) {
- uint32_t master_ifindex = nl_attr_get_u32(attrs[IFLA_MASTER]);
- for_us = master_ifindex == mon->local_ifindex;
- } else {
- /* It's for us if that device is one of our ports. */
- struct odp_port port;
- for_us = !dpif_port_query_by_name(mon->dpif, devname, &port);
- }
-
- if (!for_us) {
- /* Not for us, try again. */
- ofpbuf_delete(buf);
- COVERAGE_INC(dpifmon_poll_false_wakeup);
- goto again;
- }
- COVERAGE_INC(dpifmon_poll_changed);
- *devnamep = xstrdup(devname);
- }
- ofpbuf_delete(buf);
- break;
-
- case EAGAIN:
- /* Nothing to do. */
- break;
-
- case ENOBUFS:
- VLOG_WARN_RL(&slow_rl, "dpifmon socket overflowed");
- break;
-
- default:
- VLOG_WARN_RL(&slow_rl, "error on dpifmon socket: %s", strerror(error));
- break;
- }
- return error;
-}
-
-void
-dpifmon_run(struct dpifmon *mon UNUSED)
-{
- /* Nothing to do in this implementation. */
-}
-
-void
-dpifmon_wait(struct dpifmon *mon)
-{
- nl_sock_wait(mon->sock, POLLIN);
-}
projects / cascardo / ovs.git / blobdiff