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ovs/lib/dpif-netdev.c
Ilya Maximets ce179f1163 dpif-netdev: Add dpif-netdev/pmd-rxq-show appctl command. 
This command can be used to check the port/rxq assignment to
pmd threads. For each pmd thread of the datapath shows list
of queue-ids with port names.

Additionally log message from pmd_thread_main() extended with
queue-id, and type of this message changed from INFO to DBG.

Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>
2016-02-22 16:37:17 -08:00

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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2016 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-netdev.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 "bitmap.h"
#include "cmap.h"
#include "csum.h"
#include "dp-packet.h"
#include "dpif.h"
#include "dpif-provider.h"
#include "dummy.h"
#include "dynamic-string.h"
#include "fat-rwlock.h"
#include "flow.h"
#include "cmap.h"
#include "coverage.h"
#include "latch.h"
#include "list.h"
#include "match.h"
#include "netdev.h"
#include "netdev-dpdk.h"
#include "netdev-vport.h"
#include "netlink.h"
#include "odp-execute.h"
#include "odp-util.h"
#include "ofp-print.h"
#include "ofpbuf.h"
#include "ovs-numa.h"
#include "ovs-rcu.h"
#include "packets.h"
#include "poll-loop.h"
#include "pvector.h"
#include "random.h"
#include "seq.h"
#include "shash.h"
#include "sset.h"
#include "timeval.h"
#include "tnl-neigh-cache.h"
#include "tnl-ports.h"
#include "unixctl.h"
#include "util.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(dpif_netdev);
#define FLOW_DUMP_MAX_BATCH 50
/* Use per thread recirc_depth to prevent recirculation loop. */
#define MAX_RECIRC_DEPTH 5
DEFINE_STATIC_PER_THREAD_DATA(uint32_t, recirc_depth, 0)
/* Configuration parameters. */
enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in flow table. */
/* Protects against changes to 'dp_netdevs'. */
static struct ovs_mutex dp_netdev_mutex = OVS_MUTEX_INITIALIZER;
/* Contains all 'struct dp_netdev's. */
static struct shash dp_netdevs OVS_GUARDED_BY(dp_netdev_mutex)
= SHASH_INITIALIZER(&dp_netdevs);
static struct vlog_rate_limit upcall_rl = VLOG_RATE_LIMIT_INIT(600, 600);
static struct odp_support dp_netdev_support = {
.max_mpls_depth = SIZE_MAX,
.recirc = true,
};
/* Stores a miniflow with inline values */
struct netdev_flow_key {
uint32_t hash; /* Hash function differs for different users. */
uint32_t len; /* Length of the following miniflow (incl. map). */
struct miniflow mf;
uint64_t buf[FLOW_MAX_PACKET_U64S];
};
/* Exact match cache for frequently used flows
*
* The cache uses a 32-bit hash of the packet (which can be the RSS hash) to
* search its entries for a miniflow that matches exactly the miniflow of the
* packet. It stores the 'dpcls_rule' (rule) that matches the miniflow.
*
* A cache entry holds a reference to its 'dp_netdev_flow'.
*
* A miniflow with a given hash can be in one of EM_FLOW_HASH_SEGS different
* entries. The 32-bit hash is split into EM_FLOW_HASH_SEGS values (each of
* them is EM_FLOW_HASH_SHIFT bits wide and the remainder is thrown away). Each
* value is the index of a cache entry where the miniflow could be.
*
*
* Thread-safety
* =============
*
* Each pmd_thread has its own private exact match cache.
* If dp_netdev_input is not called from a pmd thread, a mutex is used.
*/
#define EM_FLOW_HASH_SHIFT 13
#define EM_FLOW_HASH_ENTRIES (1u << EM_FLOW_HASH_SHIFT)
#define EM_FLOW_HASH_MASK (EM_FLOW_HASH_ENTRIES - 1)
#define EM_FLOW_HASH_SEGS 2
struct emc_entry {
struct dp_netdev_flow *flow;
struct netdev_flow_key key; /* key.hash used for emc hash value. */
};
struct emc_cache {
struct emc_entry entries[EM_FLOW_HASH_ENTRIES];
int sweep_idx; /* For emc_cache_slow_sweep(). */
};
/* Iterate in the exact match cache through every entry that might contain a
* miniflow with hash 'HASH'. */
#define EMC_FOR_EACH_POS_WITH_HASH(EMC, CURRENT_ENTRY, HASH) \
for (uint32_t i__ = 0, srch_hash__ = (HASH); \
(CURRENT_ENTRY) = &(EMC)->entries[srch_hash__ & EM_FLOW_HASH_MASK], \
i__ < EM_FLOW_HASH_SEGS; \
i__++, srch_hash__ >>= EM_FLOW_HASH_SHIFT)
/* Simple non-wildcarding single-priority classifier. */
struct dpcls {
struct cmap subtables_map;
struct pvector subtables;
};
/* A rule to be inserted to the classifier. */
struct dpcls_rule {
struct cmap_node cmap_node; /* Within struct dpcls_subtable 'rules'. */
struct netdev_flow_key *mask; /* Subtable's mask. */
struct netdev_flow_key flow; /* Matching key. */
/* 'flow' must be the last field, additional space is allocated here. */
};
static void dpcls_init(struct dpcls *);
static void dpcls_destroy(struct dpcls *);
static void dpcls_insert(struct dpcls *, struct dpcls_rule *,
const struct netdev_flow_key *mask);
static void dpcls_remove(struct dpcls *, struct dpcls_rule *);
static bool dpcls_lookup(const struct dpcls *cls,
const struct netdev_flow_key keys[],
struct dpcls_rule **rules, size_t cnt);
/* Datapath based on the network device interface from netdev.h.
*
*
* Thread-safety
* =============
*
* Some members, marked 'const', are immutable. Accessing other members
* requires synchronization, as noted in more detail below.
*
* Acquisition order is, from outermost to innermost:
*
* dp_netdev_mutex (global)
* port_mutex
*/
struct dp_netdev {
const struct dpif_class *const class;
const char *const name;
struct dpif *dpif;
struct ovs_refcount ref_cnt;
atomic_flag destroyed;
/* Ports.
*
* Protected by RCU. Take the mutex to add or remove ports. */
struct ovs_mutex port_mutex;
struct cmap ports;
struct seq *port_seq; /* Incremented whenever a port changes. */
/* Protects access to ofproto-dpif-upcall interface during revalidator
* thread synchronization. */
struct fat_rwlock upcall_rwlock;
upcall_callback *upcall_cb; /* Callback function for executing upcalls. */
void *upcall_aux;
/* Callback function for notifying the purging of dp flows (during
* reseting pmd deletion). */
dp_purge_callback *dp_purge_cb;
void *dp_purge_aux;
/* Stores all 'struct dp_netdev_pmd_thread's. */
struct cmap poll_threads;
/* Protects the access of the 'struct dp_netdev_pmd_thread'
* instance for non-pmd thread. */
struct ovs_mutex non_pmd_mutex;
/* Each pmd thread will store its pointer to
* 'struct dp_netdev_pmd_thread' in 'per_pmd_key'. */
ovsthread_key_t per_pmd_key;
/* Cpu mask for pin of pmd threads. */
char *pmd_cmask;
uint64_t last_tnl_conf_seq;
};
static struct dp_netdev_port *dp_netdev_lookup_port(const struct dp_netdev *dp,
odp_port_t);
enum dp_stat_type {
DP_STAT_EXACT_HIT, /* Packets that had an exact match (emc). */
DP_STAT_MASKED_HIT, /* Packets that matched in the flow table. */
DP_STAT_MISS, /* Packets that did not match. */
DP_STAT_LOST, /* Packets not passed up to the client. */
DP_N_STATS
};
enum pmd_cycles_counter_type {
PMD_CYCLES_POLLING, /* Cycles spent polling NICs. */
PMD_CYCLES_PROCESSING, /* Cycles spent processing packets */
PMD_N_CYCLES
};
/* A port in a netdev-based datapath. */
struct dp_netdev_port {
odp_port_t port_no;
struct netdev *netdev;
struct cmap_node node; /* Node in dp_netdev's 'ports'. */
struct netdev_saved_flags *sf;
struct netdev_rxq **rxq;
struct ovs_refcount ref_cnt;
char *type; /* Port type as requested by user. */
int latest_requested_n_rxq; /* Latest requested from netdev number
of rx queues. */
};
/* Contained by struct dp_netdev_flow's 'stats' member. */
struct dp_netdev_flow_stats {
atomic_llong used; /* Last used time, in monotonic msecs. */
atomic_ullong packet_count; /* Number of packets matched. */
atomic_ullong byte_count; /* Number of bytes matched. */
atomic_uint16_t tcp_flags; /* Bitwise-OR of seen tcp_flags values. */
};
/* A flow in 'dp_netdev_pmd_thread's 'flow_table'.
*
*
* Thread-safety
* =============
*
* Except near the beginning or ending of its lifespan, rule 'rule' belongs to
* its pmd thread's classifier. The text below calls this classifier 'cls'.
*
* Motivation
* ----------
*
* The thread safety rules described here for "struct dp_netdev_flow" are
* motivated by two goals:
*
* - Prevent threads that read members of "struct dp_netdev_flow" from
* reading bad data due to changes by some thread concurrently modifying
* those members.
*
* - Prevent two threads making changes to members of a given "struct
* dp_netdev_flow" from interfering with each other.
*
*
* Rules
* -----
*
* A flow 'flow' may be accessed without a risk of being freed during an RCU
* grace period. Code that needs to hold onto a flow for a while
* should try incrementing 'flow->ref_cnt' with dp_netdev_flow_ref().
*
* 'flow->ref_cnt' protects 'flow' from being freed. It doesn't protect the
* flow from being deleted from 'cls' and it doesn't protect members of 'flow'
* from modification.
*
* Some members, marked 'const', are immutable. Accessing other members
* requires synchronization, as noted in more detail below.
*/
struct dp_netdev_flow {
const struct flow flow; /* Unmasked flow that created this entry. */
/* Hash table index by unmasked flow. */
const struct cmap_node node; /* In owning dp_netdev_pmd_thread's */
/* 'flow_table'. */
const ovs_u128 ufid; /* Unique flow identifier. */
const unsigned pmd_id; /* The 'core_id' of pmd thread owning this */
/* flow. */
/* Number of references.
* The classifier owns one reference.
* Any thread trying to keep a rule from being freed should hold its own
* reference. */
struct ovs_refcount ref_cnt;
bool dead;
/* Statistics. */
struct dp_netdev_flow_stats stats;
/* Actions. */
OVSRCU_TYPE(struct dp_netdev_actions *) actions;
/* While processing a group of input packets, the datapath uses the next
* member to store a pointer to the output batch for the flow. It is
* reset after the batch has been sent out (See dp_netdev_queue_batches(),
* packet_batch_init() and packet_batch_execute()). */
struct packet_batch *batch;
/* Packet classification. */
struct dpcls_rule cr; /* In owning dp_netdev's 'cls'. */
/* 'cr' must be the last member. */
};
static void dp_netdev_flow_unref(struct dp_netdev_flow *);
static bool dp_netdev_flow_ref(struct dp_netdev_flow *);
static int dpif_netdev_flow_from_nlattrs(const struct nlattr *, uint32_t,
struct flow *);
/* A set of datapath actions within a "struct dp_netdev_flow".
*
*
* Thread-safety
* =============
*
* A struct dp_netdev_actions 'actions' is protected with RCU. */
struct dp_netdev_actions {
/* These members are immutable: they do not change during the struct's
* lifetime. */
unsigned int size; /* Size of 'actions', in bytes. */
struct nlattr actions[]; /* Sequence of OVS_ACTION_ATTR_* attributes. */
};
struct dp_netdev_actions *dp_netdev_actions_create(const struct nlattr *,
size_t);
struct dp_netdev_actions *dp_netdev_flow_get_actions(
const struct dp_netdev_flow *);
static void dp_netdev_actions_free(struct dp_netdev_actions *);
/* Contained by struct dp_netdev_pmd_thread's 'stats' member. */
struct dp_netdev_pmd_stats {
/* Indexed by DP_STAT_*. */
atomic_ullong n[DP_N_STATS];
};
/* Contained by struct dp_netdev_pmd_thread's 'cycle' member. */
struct dp_netdev_pmd_cycles {
/* Indexed by PMD_CYCLES_*. */
atomic_ullong n[PMD_N_CYCLES];
};
/* Contained by struct dp_netdev_pmd_thread's 'poll_list' member. */
struct rxq_poll {
struct dp_netdev_port *port;
struct netdev_rxq *rx;
struct ovs_list node;
};
/* PMD: Poll modes drivers. PMD accesses devices via polling to eliminate
* the performance overhead of interrupt processing. Therefore netdev can
* not implement rx-wait for these devices. dpif-netdev needs to poll
* these device to check for recv buffer. pmd-thread does polling for
* devices assigned to itself.
*
* DPDK used PMD for accessing NIC.
*
* Note, instance with cpu core id NON_PMD_CORE_ID will be reserved for
* I/O of all non-pmd threads. There will be no actual thread created
* for the instance.
*
* Each struct has its own flow table and classifier. Packets received
* from managed ports are looked up in the corresponding pmd thread's
* flow table, and are executed with the found actions.
* */
struct dp_netdev_pmd_thread {
struct dp_netdev *dp;
struct ovs_refcount ref_cnt; /* Every reference must be refcount'ed. */
struct cmap_node node; /* In 'dp->poll_threads'. */
pthread_cond_t cond; /* For synchronizing pmd thread reload. */
struct ovs_mutex cond_mutex; /* Mutex for condition variable. */
/* Per thread exact-match cache. Note, the instance for cpu core
* NON_PMD_CORE_ID can be accessed by multiple threads, and thusly
* need to be protected (e.g. by 'dp_netdev_mutex'). All other
* instances will only be accessed by its own pmd thread. */
struct emc_cache flow_cache;
/* Classifier and Flow-Table.
*
* Writers of 'flow_table' must take the 'flow_mutex'. Corresponding
* changes to 'cls' must be made while still holding the 'flow_mutex'.
*/
struct ovs_mutex flow_mutex;
struct dpcls cls;
struct cmap flow_table OVS_GUARDED; /* Flow table. */
/* Statistics. */
struct dp_netdev_pmd_stats stats;
/* Cycles counters */
struct dp_netdev_pmd_cycles cycles;
/* Used to count cicles. See 'cycles_counter_end()' */
unsigned long long last_cycles;
struct latch exit_latch; /* For terminating the pmd thread. */
atomic_uint change_seq; /* For reloading pmd ports. */
pthread_t thread;
int index; /* Idx of this pmd thread among pmd*/
/* threads on same numa node. */
unsigned core_id; /* CPU core id of this pmd thread. */
int numa_id; /* numa node id of this pmd thread. */
atomic_int tx_qid; /* Queue id used by this pmd thread to
* send packets on all netdevs */
struct ovs_mutex poll_mutex; /* Mutex for poll_list. */
/* List of rx queues to poll. */
struct ovs_list poll_list OVS_GUARDED;
int poll_cnt; /* Number of elemints in poll_list. */
/* Only a pmd thread can write on its own 'cycles' and 'stats'.
* The main thread keeps 'stats_zero' and 'cycles_zero' as base
* values and subtracts them from 'stats' and 'cycles' before
* reporting to the user */
unsigned long long stats_zero[DP_N_STATS];
uint64_t cycles_zero[PMD_N_CYCLES];
};
#define PMD_INITIAL_SEQ 1
/* Interface to netdev-based datapath. */
struct dpif_netdev {
struct dpif dpif;
struct dp_netdev *dp;
uint64_t last_port_seq;
};
static int get_port_by_number(struct dp_netdev *dp, odp_port_t port_no,
struct dp_netdev_port **portp);
static int get_port_by_name(struct dp_netdev *dp, const char *devname,
struct dp_netdev_port **portp);
static void dp_netdev_free(struct dp_netdev *)
OVS_REQUIRES(dp_netdev_mutex);
static int do_add_port(struct dp_netdev *dp, const char *devname,
const char *type, odp_port_t port_no)
OVS_REQUIRES(dp->port_mutex);
static void do_del_port(struct dp_netdev *dp, struct dp_netdev_port *)
OVS_REQUIRES(dp->port_mutex);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static void dp_netdev_execute_actions(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **, int c,
bool may_steal,
const struct nlattr *actions,
size_t actions_len);
static void dp_netdev_input(struct dp_netdev_pmd_thread *,
struct dp_packet **, int cnt, odp_port_t port_no);
static void dp_netdev_recirculate(struct dp_netdev_pmd_thread *,
struct dp_packet **, int cnt);
static void dp_netdev_disable_upcall(struct dp_netdev *);
static void dp_netdev_pmd_reload_done(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_configure_pmd(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev *dp, int index,
unsigned core_id, int numa_id);
static void dp_netdev_destroy_pmd(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_set_nonpmd(struct dp_netdev *dp);
static struct dp_netdev_pmd_thread *dp_netdev_get_pmd(struct dp_netdev *dp,
unsigned core_id);
static struct dp_netdev_pmd_thread *
dp_netdev_pmd_get_next(struct dp_netdev *dp, struct cmap_position *pos);
static void dp_netdev_destroy_all_pmds(struct dp_netdev *dp);
static void dp_netdev_del_pmds_on_numa(struct dp_netdev *dp, int numa_id);
static void dp_netdev_set_pmds_on_numa(struct dp_netdev *dp, int numa_id);
static void
dp_netdev_add_rxq_to_pmd(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev_port *port, struct netdev_rxq *rx);
static struct dp_netdev_pmd_thread *
dp_netdev_less_loaded_pmd_on_numa(struct dp_netdev *dp, int numa_id);
static void dp_netdev_reset_pmd_threads(struct dp_netdev *dp);
static bool dp_netdev_pmd_try_ref(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_pmd_unref(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_pmd_flow_flush(struct dp_netdev_pmd_thread *pmd);
static inline bool emc_entry_alive(struct emc_entry *ce);
static void emc_clear_entry(struct emc_entry *ce);
static void
emc_cache_init(struct emc_cache *flow_cache)
{
int i;
flow_cache->sweep_idx = 0;
for (i = 0; i < ARRAY_SIZE(flow_cache->entries); i++) {
flow_cache->entries[i].flow = NULL;
flow_cache->entries[i].key.hash = 0;
flow_cache->entries[i].key.len = sizeof(struct miniflow);
flowmap_init(&flow_cache->entries[i].key.mf.map);
}
}
static void
emc_cache_uninit(struct emc_cache *flow_cache)
{
int i;
for (i = 0; i < ARRAY_SIZE(flow_cache->entries); i++) {
emc_clear_entry(&flow_cache->entries[i]);
}
}
/* Check and clear dead flow references slowly (one entry at each
* invocation). */
static void
emc_cache_slow_sweep(struct emc_cache *flow_cache)
{
struct emc_entry *entry = &flow_cache->entries[flow_cache->sweep_idx];
if (!emc_entry_alive(entry)) {
emc_clear_entry(entry);
}
flow_cache->sweep_idx = (flow_cache->sweep_idx + 1) & EM_FLOW_HASH_MASK;
}
/* Returns true if 'dpif' is a netdev or dummy dpif, false otherwise. */
bool
dpif_is_netdev(const struct dpif *dpif)
{
return dpif->dpif_class->open == dpif_netdev_open;
}
static struct dpif_netdev *
dpif_netdev_cast(const struct dpif *dpif)
{
ovs_assert(dpif_is_netdev(dpif));
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;
}
enum pmd_info_type {
PMD_INFO_SHOW_STATS, /* Show how cpu cycles are spent. */
PMD_INFO_CLEAR_STATS, /* Set the cycles count to 0. */
PMD_INFO_SHOW_RXQ /* Show poll-lists of pmd threads. */
};
static void
pmd_info_show_stats(struct ds *reply,
struct dp_netdev_pmd_thread *pmd,
unsigned long long stats[DP_N_STATS],
uint64_t cycles[PMD_N_CYCLES])
{
unsigned long long total_packets = 0;
uint64_t total_cycles = 0;
int i;
/* These loops subtracts reference values ('*_zero') from the counters.
* Since loads and stores are relaxed, it might be possible for a '*_zero'
* value to be more recent than the current value we're reading from the
* counter. This is not a big problem, since these numbers are not
* supposed to be too accurate, but we should at least make sure that
* the result is not negative. */
for (i = 0; i < DP_N_STATS; i++) {
if (stats[i] > pmd->stats_zero[i]) {
stats[i] -= pmd->stats_zero[i];
} else {
stats[i] = 0;
}
if (i != DP_STAT_LOST) {
/* Lost packets are already included in DP_STAT_MISS */
total_packets += stats[i];
}
}
for (i = 0; i < PMD_N_CYCLES; i++) {
if (cycles[i] > pmd->cycles_zero[i]) {
cycles[i] -= pmd->cycles_zero[i];
} else {
cycles[i] = 0;
}
total_cycles += cycles[i];
}
ds_put_cstr(reply, (pmd->core_id == NON_PMD_CORE_ID)
? "main thread" : "pmd thread");
if (pmd->numa_id != OVS_NUMA_UNSPEC) {
ds_put_format(reply, " numa_id %d", pmd->numa_id);
}
if (pmd->core_id != OVS_CORE_UNSPEC && pmd->core_id != NON_PMD_CORE_ID) {
ds_put_format(reply, " core_id %u", pmd->core_id);
}
ds_put_cstr(reply, ":\n");
ds_put_format(reply,
"\temc hits:%llu\n\tmegaflow hits:%llu\n"
"\tmiss:%llu\n\tlost:%llu\n",
stats[DP_STAT_EXACT_HIT], stats[DP_STAT_MASKED_HIT],
stats[DP_STAT_MISS], stats[DP_STAT_LOST]);
if (total_cycles == 0) {
return;
}
ds_put_format(reply,
"\tpolling cycles:%"PRIu64" (%.02f%%)\n"
"\tprocessing cycles:%"PRIu64" (%.02f%%)\n",
cycles[PMD_CYCLES_POLLING],
cycles[PMD_CYCLES_POLLING] / (double)total_cycles * 100,
cycles[PMD_CYCLES_PROCESSING],
cycles[PMD_CYCLES_PROCESSING] / (double)total_cycles * 100);
if (total_packets == 0) {
return;
}
ds_put_format(reply,
"\tavg cycles per packet: %.02f (%"PRIu64"/%llu)\n",
total_cycles / (double)total_packets,
total_cycles, total_packets);
ds_put_format(reply,
"\tavg processing cycles per packet: "
"%.02f (%"PRIu64"/%llu)\n",
cycles[PMD_CYCLES_PROCESSING] / (double)total_packets,
cycles[PMD_CYCLES_PROCESSING], total_packets);
}
static void
pmd_info_clear_stats(struct ds *reply OVS_UNUSED,
struct dp_netdev_pmd_thread *pmd,
unsigned long long stats[DP_N_STATS],
uint64_t cycles[PMD_N_CYCLES])
{
int i;
/* We cannot write 'stats' and 'cycles' (because they're written by other
* threads) and we shouldn't change 'stats' (because they're used to count
* datapath stats, which must not be cleared here). Instead, we save the
* current values and subtract them from the values to be displayed in the
* future */
for (i = 0; i < DP_N_STATS; i++) {
pmd->stats_zero[i] = stats[i];
}
for (i = 0; i < PMD_N_CYCLES; i++) {
pmd->cycles_zero[i] = cycles[i];
}
}
static void
pmd_info_show_rxq(struct ds *reply, struct dp_netdev_pmd_thread *pmd)
{
if (pmd->core_id != NON_PMD_CORE_ID) {
struct rxq_poll *poll;
const char *prev_name = NULL;
ds_put_format(reply, "pmd thread numa_id %d core_id %u:\n",
pmd->numa_id, pmd->core_id);
ovs_mutex_lock(&pmd->poll_mutex);
LIST_FOR_EACH (poll, node, &pmd->poll_list) {
const char *name = netdev_get_name(poll->port->netdev);
if (!prev_name || strcmp(name, prev_name)) {
if (prev_name) {
ds_put_cstr(reply, "\n");
}
ds_put_format(reply, "\tport: %s\tqueue-id:",
netdev_get_name(poll->port->netdev));
}
ds_put_format(reply, " %d", netdev_rxq_get_queue_id(poll->rx));
prev_name = name;
}
ovs_mutex_unlock(&pmd->poll_mutex);
ds_put_cstr(reply, "\n");
}
}
static void
dpif_netdev_pmd_info(struct unixctl_conn *conn, int argc, const char *argv[],
void *aux)
{
struct ds reply = DS_EMPTY_INITIALIZER;
struct dp_netdev_pmd_thread *pmd;
struct dp_netdev *dp = NULL;
enum pmd_info_type type = *(enum pmd_info_type *) aux;
ovs_mutex_lock(&dp_netdev_mutex);
if (argc == 2) {
dp = shash_find_data(&dp_netdevs, argv[1]);
} else if (shash_count(&dp_netdevs) == 1) {
/* There's only one datapath */
dp = shash_first(&dp_netdevs)->data;
}
if (!dp) {
ovs_mutex_unlock(&dp_netdev_mutex);
unixctl_command_reply_error(conn,
"please specify an existing datapath");
return;
}
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (type == PMD_INFO_SHOW_RXQ) {
pmd_info_show_rxq(&reply, pmd);
} else {
unsigned long long stats[DP_N_STATS];
uint64_t cycles[PMD_N_CYCLES];
int i;
/* Read current stats and cycle counters */
for (i = 0; i < ARRAY_SIZE(stats); i++) {
atomic_read_relaxed(&pmd->stats.n[i], &stats[i]);
}
for (i = 0; i < ARRAY_SIZE(cycles); i++) {
atomic_read_relaxed(&pmd->cycles.n[i], &cycles[i]);
}
if (type == PMD_INFO_CLEAR_STATS) {
pmd_info_clear_stats(&reply, pmd, stats, cycles);
} else if (type == PMD_INFO_SHOW_STATS) {
pmd_info_show_stats(&reply, pmd, stats, cycles);
}
}
}
ovs_mutex_unlock(&dp_netdev_mutex);
unixctl_command_reply(conn, ds_cstr(&reply));
ds_destroy(&reply);
}
static int
dpif_netdev_init(void)
{
static enum pmd_info_type show_aux = PMD_INFO_SHOW_STATS,
clear_aux = PMD_INFO_CLEAR_STATS,
poll_aux = PMD_INFO_SHOW_RXQ;
unixctl_command_register("dpif-netdev/pmd-stats-show", "[dp]",
0, 1, dpif_netdev_pmd_info,
(void *)&show_aux);
unixctl_command_register("dpif-netdev/pmd-stats-clear", "[dp]",
0, 1, dpif_netdev_pmd_info,
(void *)&clear_aux);
unixctl_command_register("dpif-netdev/pmd-rxq-show", "[dp]",
0, 1, dpif_netdev_pmd_info,
(void *)&poll_aux);
return 0;
}
static int
dpif_netdev_enumerate(struct sset *all_dps,
const struct dpif_class *dpif_class)
{
struct shash_node *node;
ovs_mutex_lock(&dp_netdev_mutex);
SHASH_FOR_EACH(node, &dp_netdevs) {
struct dp_netdev *dp = node->data;
if (dpif_class != dp->class) {
/* 'dp_netdevs' contains both "netdev" and "dummy" dpifs.
* If the class doesn't match, skip this dpif. */
continue;
}
sset_add(all_dps, node->name);
}
ovs_mutex_unlock(&dp_netdev_mutex);
return 0;
}
static bool
dpif_netdev_class_is_dummy(const struct dpif_class *class)
{
return class != &dpif_netdev_class;
}
static const char *
dpif_netdev_port_open_type(const struct dpif_class *class, const char *type)
{
return strcmp(type, "internal") ? type
: dpif_netdev_class_is_dummy(class) ? "dummy"
: "tap";
}
static struct dpif *
create_dpif_netdev(struct dp_netdev *dp)
{
uint16_t netflow_id = hash_string(dp->name, 0);
struct dpif_netdev *dpif;
ovs_refcount_ref(&dp->ref_cnt);
dpif = xmalloc(sizeof *dpif);
dpif_init(&dpif->dpif, dp->class, dp->name, netflow_id >> 8, netflow_id);
dpif->dp = dp;
dpif->last_port_seq = seq_read(dp->port_seq);
return &dpif->dpif;
}
/* Choose an unused, non-zero port number and return it on success.
* Return ODPP_NONE on failure. */
static odp_port_t
choose_port(struct dp_netdev *dp, const char *name)
OVS_REQUIRES(dp->port_mutex)
{
uint32_t port_no;
if (dp->class != &dpif_netdev_class) {
const char *p;
int start_no = 0;
/* If the port name begins with "br", start the number search at
* 100 to make writing tests easier. */
if (!strncmp(name, "br", 2)) {
start_no = 100;
}
/* If the port name contains a number, try to assign that port number.
* This can make writing unit tests easier because port numbers are
* predictable. */
for (p = name; *p != '\0'; p++) {
if (isdigit((unsigned char) *p)) {
port_no = start_no + strtol(p, NULL, 10);
if (port_no > 0 && port_no != odp_to_u32(ODPP_NONE)
&& !dp_netdev_lookup_port(dp, u32_to_odp(port_no))) {
return u32_to_odp(port_no);
}
break;
}
}
}
for (port_no = 1; port_no <= UINT16_MAX; port_no++) {
if (!dp_netdev_lookup_port(dp, u32_to_odp(port_no))) {
return u32_to_odp(port_no);
}
}
return ODPP_NONE;
}
static int
create_dp_netdev(const char *name, const struct dpif_class *class,
struct dp_netdev **dpp)
OVS_REQUIRES(dp_netdev_mutex)
{
struct dp_netdev *dp;
int error;
dp = xzalloc(sizeof *dp);
shash_add(&dp_netdevs, name, dp);
*CONST_CAST(const struct dpif_class **, &dp->class) = class;
*CONST_CAST(const char **, &dp->name) = xstrdup(name);
ovs_refcount_init(&dp->ref_cnt);
atomic_flag_clear(&dp->destroyed);
ovs_mutex_init(&dp->port_mutex);
cmap_init(&dp->ports);
dp->port_seq = seq_create();
fat_rwlock_init(&dp->upcall_rwlock);
/* Disable upcalls by default. */
dp_netdev_disable_upcall(dp);
dp->upcall_aux = NULL;
dp->upcall_cb = NULL;
cmap_init(&dp->poll_threads);
ovs_mutex_init_recursive(&dp->non_pmd_mutex);
ovsthread_key_create(&dp->per_pmd_key, NULL);
dp_netdev_set_nonpmd(dp);
ovs_mutex_lock(&dp->port_mutex);
error = do_add_port(dp, name, "internal", ODPP_LOCAL);
ovs_mutex_unlock(&dp->port_mutex);
if (error) {
dp_netdev_free(dp);
return error;
}
dp->last_tnl_conf_seq = seq_read(tnl_conf_seq);
*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);
dp->dpif = *dpifp;
}
ovs_mutex_unlock(&dp_netdev_mutex);
return error;
}
static void
dp_netdev_destroy_upcall_lock(struct dp_netdev *dp)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
/* Check that upcalls are disabled, i.e. that the rwlock is taken */
ovs_assert(fat_rwlock_tryrdlock(&dp->upcall_rwlock));
/* Before freeing a lock we should release it */
fat_rwlock_unlock(&dp->upcall_rwlock);
fat_rwlock_destroy(&dp->upcall_rwlock);
}
/* Requires dp_netdev_mutex so that we can't get a new reference to 'dp'
* through the 'dp_netdevs' shash while freeing 'dp'. */
static void
dp_netdev_free(struct dp_netdev *dp)
OVS_REQUIRES(dp_netdev_mutex)
{
struct dp_netdev_port *port;
shash_find_and_delete(&dp_netdevs, dp->name);
dp_netdev_destroy_all_pmds(dp);
ovs_mutex_destroy(&dp->non_pmd_mutex);
ovsthread_key_delete(dp->per_pmd_key);
ovs_mutex_lock(&dp->port_mutex);
CMAP_FOR_EACH (port, node, &dp->ports) {
/* PMD threads are destroyed here. do_del_port() cannot quiesce */
do_del_port(dp, port);
}
ovs_mutex_unlock(&dp->port_mutex);
cmap_destroy(&dp->poll_threads);
seq_destroy(dp->port_seq);
cmap_destroy(&dp->ports);
/* Upcalls must be disabled at this point */
dp_netdev_destroy_upcall_lock(dp);
free(dp->pmd_cmask);
free(CONST_CAST(char *, dp->name));
free(dp);
}
static void
dp_netdev_unref(struct dp_netdev *dp)
{
if (dp) {
/* Take dp_netdev_mutex so that, if dp->ref_cnt falls to zero, we can't
* get a new reference to 'dp' through the 'dp_netdevs' shash. */
ovs_mutex_lock(&dp_netdev_mutex);
if (ovs_refcount_unref_relaxed(&dp->ref_cnt) == 1) {
dp_netdev_free(dp);
}
ovs_mutex_unlock(&dp_netdev_mutex);
}
}
static void
dpif_netdev_close(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_unref(dp);
free(dpif);
}
static int
dpif_netdev_destroy(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
if (!atomic_flag_test_and_set(&dp->destroyed)) {
if (ovs_refcount_unref_relaxed(&dp->ref_cnt) == 1) {
/* Can't happen: 'dpif' still owns a reference to 'dp'. */
OVS_NOT_REACHED();
}
}
return 0;
}
/* Add 'n' to the atomic variable 'var' non-atomically and using relaxed
* load/store semantics. While the increment is not atomic, the load and
* store operations are, making it impossible to read inconsistent values.
*
* This is used to update thread local stats counters. */
static void
non_atomic_ullong_add(atomic_ullong *var, unsigned long long n)
{
unsigned long long tmp;
atomic_read_relaxed(var, &tmp);
tmp += n;
atomic_store_relaxed(var, tmp);
}
static int
dpif_netdev_get_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_pmd_thread *pmd;
stats->n_flows = stats->n_hit = stats->n_missed = stats->n_lost = 0;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
unsigned long long n;
stats->n_flows += cmap_count(&pmd->flow_table);
atomic_read_relaxed(&pmd->stats.n[DP_STAT_MASKED_HIT], &n);
stats->n_hit += n;
atomic_read_relaxed(&pmd->stats.n[DP_STAT_EXACT_HIT], &n);
stats->n_hit += n;
atomic_read_relaxed(&pmd->stats.n[DP_STAT_MISS], &n);
stats->n_missed += n;
atomic_read_relaxed(&pmd->stats.n[DP_STAT_LOST], &n);
stats->n_lost += n;
}
stats->n_masks = UINT32_MAX;
stats->n_mask_hit = UINT64_MAX;
return 0;
}
static void
dp_netdev_reload_pmd__(struct dp_netdev_pmd_thread *pmd)
{
int old_seq;
if (pmd->core_id == NON_PMD_CORE_ID) {
return;
}
ovs_mutex_lock(&pmd->cond_mutex);
atomic_add_relaxed(&pmd->change_seq, 1, &old_seq);
ovs_mutex_cond_wait(&pmd->cond, &pmd->cond_mutex);
ovs_mutex_unlock(&pmd->cond_mutex);
}
static uint32_t
hash_port_no(odp_port_t port_no)
{
return hash_int(odp_to_u32(port_no), 0);
}
static int
do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
odp_port_t port_no)
OVS_REQUIRES(dp->port_mutex)
{
struct netdev_saved_flags *sf;
struct dp_netdev_port *port;
struct netdev *netdev;
enum netdev_flags flags;
const char *open_type;
int error;
int i;
/* Reject devices already in 'dp'. */
if (!get_port_by_name(dp, devname, &port)) {
return EEXIST;
}
/* 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;
}
if (netdev_is_pmd(netdev)) {
int n_cores = ovs_numa_get_n_cores();
if (n_cores == OVS_CORE_UNSPEC) {
VLOG_ERR("%s, cannot get cpu core info", devname);
return ENOENT;
}
/* There can only be ovs_numa_get_n_cores() pmd threads,
* so creates a txq for each, and one extra for the non
* pmd threads. */
error = netdev_set_multiq(netdev, n_cores + 1,
netdev_requested_n_rxq(netdev));
if (error && (error != EOPNOTSUPP)) {
VLOG_ERR("%s, cannot set multiq", devname);
return errno;
}
}
port = xzalloc(sizeof *port);
port->port_no = port_no;
port->netdev = netdev;
port->rxq = xmalloc(sizeof *port->rxq * netdev_n_rxq(netdev));
port->type = xstrdup(type);
port->latest_requested_n_rxq = netdev_requested_n_rxq(netdev);
for (i = 0; i < netdev_n_rxq(netdev); i++) {
error = netdev_rxq_open(netdev, &port->rxq[i], i);
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);
free(port->type);
free(port->rxq);
free(port);
return error;
}
}
error = netdev_turn_flags_on(netdev, NETDEV_PROMISC, &sf);
if (error) {
for (i = 0; i < netdev_n_rxq(netdev); i++) {
netdev_rxq_close(port->rxq[i]);
}
netdev_close(netdev);
free(port->type);
free(port->rxq);
free(port);
return error;
}
port->sf = sf;
ovs_refcount_init(&port->ref_cnt);
cmap_insert(&dp->ports, &port->node, hash_port_no(port_no));
if (netdev_is_pmd(netdev)) {
int numa_id = netdev_get_numa_id(netdev);
struct dp_netdev_pmd_thread *pmd;
/* Cannot create pmd threads for invalid numa node. */
ovs_assert(ovs_numa_numa_id_is_valid(numa_id));
for (i = 0; i < netdev_n_rxq(netdev); i++) {
pmd = dp_netdev_less_loaded_pmd_on_numa(dp, numa_id);
if (!pmd) {
/* There is no pmd threads on this numa node. */
dp_netdev_set_pmds_on_numa(dp, numa_id);
/* Assigning of rx queues done. */
break;
}
ovs_mutex_lock(&pmd->poll_mutex);
dp_netdev_add_rxq_to_pmd(pmd, port, port->rxq[i]);
ovs_mutex_unlock(&pmd->poll_mutex);
dp_netdev_reload_pmd__(pmd);
}
}
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->port_mutex);
dpif_port = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf);
if (*port_nop != ODPP_NONE) {
port_no = *port_nop;
error = dp_netdev_lookup_port(dp, *port_nop) ? EBUSY : 0;
} else {
port_no = choose_port(dp, dpif_port);
error = port_no == ODPP_NONE ? EFBIG : 0;
}
if (!error) {
*port_nop = port_no;
error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no);
}
ovs_mutex_unlock(&dp->port_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->port_mutex);
if (port_no == ODPP_LOCAL) {
error = EINVAL;
} else {
struct dp_netdev_port *port;
error = get_port_by_number(dp, port_no, &port);
if (!error) {
do_del_port(dp, port);
}
}
ovs_mutex_unlock(&dp->port_mutex);
return error;
}
static bool
is_valid_port_number(odp_port_t port_no)
{
return port_no != ODPP_NONE;
}
static struct dp_netdev_port *
dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t port_no)
{
struct dp_netdev_port *port;
CMAP_FOR_EACH_WITH_HASH (port, node, hash_port_no(port_no), &dp->ports) {
if (port->port_no == port_no) {
return port;
}
}
return NULL;
}
static int
get_port_by_number(struct dp_netdev *dp,
odp_port_t port_no, struct dp_netdev_port **portp)
{
if (!is_valid_port_number(port_no)) {
*portp = NULL;
return EINVAL;
} else {
*portp = dp_netdev_lookup_port(dp, port_no);
return *portp ? 0 : ENOENT;
}
}
static void
port_ref(struct dp_netdev_port *port)
{
if (port) {
ovs_refcount_ref(&port->ref_cnt);
}
}
static void
port_unref(struct dp_netdev_port *port)
{
if (port && ovs_refcount_unref_relaxed(&port->ref_cnt) == 1) {
int n_rxq = netdev_n_rxq(port->netdev);
int i;
netdev_close(port->netdev);
netdev_restore_flags(port->sf);
for (i = 0; i < n_rxq; i++) {
netdev_rxq_close(port->rxq[i]);
}
free(port->rxq);
free(port->type);
free(port);
}
}
static int
get_port_by_name(struct dp_netdev *dp,
const char *devname, struct dp_netdev_port **portp)
OVS_REQUIRES(dp->port_mutex)
{
struct dp_netdev_port *port;
CMAP_FOR_EACH (port, node, &dp->ports) {
if (!strcmp(netdev_get_name(port->netdev), devname)) {
*portp = port;
return 0;
}
}
return ENOENT;
}
static int
get_n_pmd_threads(struct dp_netdev *dp)
{
/* There is one non pmd thread in dp->poll_threads */
return cmap_count(&dp->poll_threads) - 1;
}
static int
get_n_pmd_threads_on_numa(struct dp_netdev *dp, int numa_id)
{
struct dp_netdev_pmd_thread *pmd;
int n_pmds = 0;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (pmd->numa_id == numa_id) {
n_pmds++;
}
}
return n_pmds;
}
/* Returns 'true' if there is a port with pmd netdev and the netdev
* is on numa node 'numa_id'. */
static bool
has_pmd_port_for_numa(struct dp_netdev *dp, int numa_id)
{
struct dp_netdev_port *port;
CMAP_FOR_EACH (port, node, &dp->ports) {
if (netdev_is_pmd(port->netdev)
&& netdev_get_numa_id(port->netdev) == numa_id) {
return true;
}
}
return false;
}
static void
do_del_port(struct dp_netdev *dp, struct dp_netdev_port *port)
OVS_REQUIRES(dp->port_mutex)
{
cmap_remove(&dp->ports, &port->node, hash_odp_port(port->port_no));
seq_change(dp->port_seq);
if (netdev_is_pmd(port->netdev)) {
int numa_id = netdev_get_numa_id(port->netdev);
/* PMD threads can not be on invalid numa node. */
ovs_assert(ovs_numa_numa_id_is_valid(numa_id));
/* If there is no netdev on the numa node, deletes the pmd threads
* for that numa. Else, deletes the queues from polling lists. */
if (!has_pmd_port_for_numa(dp, numa_id)) {
dp_netdev_del_pmds_on_numa(dp, numa_id);
} else {
struct dp_netdev_pmd_thread *pmd;
struct rxq_poll *poll, *next;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (pmd->numa_id == numa_id) {
bool found = false;
ovs_mutex_lock(&pmd->poll_mutex);
LIST_FOR_EACH_SAFE (poll, next, node, &pmd->poll_list) {
if (poll->port == port) {
found = true;
port_unref(poll->port);
list_remove(&poll->node);
pmd->poll_cnt--;
free(poll);
}
}
ovs_mutex_unlock(&pmd->poll_mutex);
if (found) {
dp_netdev_reload_pmd__(pmd);
}
}
}
}
}
port_unref(port);
}
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;
error = get_port_by_number(dp, port_no, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
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->port_mutex);
error = get_port_by_name(dp, devname, &port);
if (!error && dpif_port) {
answer_port_query(port, dpif_port);
}
ovs_mutex_unlock(&dp->port_mutex);
return error;
}
static void
dp_netdev_flow_free(struct dp_netdev_flow *flow)
{
dp_netdev_actions_free(dp_netdev_flow_get_actions(flow));
free(flow);
}
static void dp_netdev_flow_unref(struct dp_netdev_flow *flow)
{
if (ovs_refcount_unref_relaxed(&flow->ref_cnt) == 1) {
ovsrcu_postpone(dp_netdev_flow_free, flow);
}
}
static uint32_t
dp_netdev_flow_hash(const ovs_u128 *ufid)
{
return ufid->u32[0];
}
static void
dp_netdev_pmd_remove_flow(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev_flow *flow)
OVS_REQUIRES(pmd->flow_mutex)
{
struct cmap_node *node = CONST_CAST(struct cmap_node *, &flow->node);
dpcls_remove(&pmd->cls, &flow->cr);
flow->cr.mask = NULL; /* Accessing rule's mask after this is not safe. */
cmap_remove(&pmd->flow_table, node, dp_netdev_flow_hash(&flow->ufid));
flow->dead = true;
dp_netdev_flow_unref(flow);
}
static void
dp_netdev_pmd_flow_flush(struct dp_netdev_pmd_thread *pmd)
{
struct dp_netdev_flow *netdev_flow;
ovs_mutex_lock(&pmd->flow_mutex);
CMAP_FOR_EACH (netdev_flow, node, &pmd->flow_table) {
dp_netdev_pmd_remove_flow(pmd, netdev_flow);
}
ovs_mutex_unlock(&pmd->flow_mutex);
}
static int
dpif_netdev_flow_flush(struct dpif *dpif)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_pmd_thread *pmd;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
dp_netdev_pmd_flow_flush(pmd);
}
return 0;
}
struct dp_netdev_port_state {
struct cmap_position position;
char *name;
};
static int
dpif_netdev_port_dump_start(const struct dpif *dpif OVS_UNUSED, void **statep)
{
*statep = xzalloc(sizeof(struct dp_netdev_port_state));
return 0;
}
static int
dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_,
struct dpif_port *dpif_port)
{
struct dp_netdev_port_state *state = state_;
struct dp_netdev *dp = get_dp_netdev(dpif);
struct cmap_node *node;
int retval;
node = cmap_next_position(&dp->ports, &state->position);
if (node) {
struct dp_netdev_port *port;
port = CONTAINER_OF(node, struct dp_netdev_port, node);
free(state->name);
state->name = xstrdup(netdev_get_name(port->netdev));
dpif_port->name = state->name;
dpif_port->type = port->type;
dpif_port->port_no = port->port_no;
retval = 0;
} else {
retval = EOF;
}
return retval;
}
static int
dpif_netdev_port_dump_done(const struct dpif *dpif OVS_UNUSED, void *state_)
{
struct dp_netdev_port_state *state = state_;
free(state->name);
free(state);
return 0;
}
static int
dpif_netdev_port_poll(const struct dpif *dpif_, char **devnamep OVS_UNUSED)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
uint64_t new_port_seq;
int error;
new_port_seq = seq_read(dpif->dp->port_seq);
if (dpif->last_port_seq != new_port_seq) {
dpif->last_port_seq = new_port_seq;
error = ENOBUFS;
} else {
error = EAGAIN;
}
return error;
}
static void
dpif_netdev_port_poll_wait(const struct dpif *dpif_)
{
struct dpif_netdev *dpif = dpif_netdev_cast(dpif_);
seq_wait(dpif->dp->port_seq, dpif->last_port_seq);
}
static struct dp_netdev_flow *
dp_netdev_flow_cast(const struct dpcls_rule *cr)
{
return cr ? CONTAINER_OF(cr, struct dp_netdev_flow, cr) : NULL;
}
static bool dp_netdev_flow_ref(struct dp_netdev_flow *flow)
{
return ovs_refcount_try_ref_rcu(&flow->ref_cnt);
}
/* netdev_flow_key utilities.
*
* netdev_flow_key is basically a miniflow. We use these functions
* (netdev_flow_key_clone, netdev_flow_key_equal, ...) instead of the miniflow
* functions (miniflow_clone_inline, miniflow_equal, ...), because:
*
* - Since we are dealing exclusively with miniflows created by
* miniflow_extract(), if the map is different the miniflow is different.
* Therefore we can be faster by comparing the map and the miniflow in a
* single memcmp().
* - These functions can be inlined by the compiler. */
/* Given the number of bits set in miniflow's maps, returns the size of the
* 'netdev_flow_key.mf' */
static inline size_t
netdev_flow_key_size(size_t flow_u64s)
{
return sizeof(struct miniflow) + MINIFLOW_VALUES_SIZE(flow_u64s);
}
static inline bool
netdev_flow_key_equal(const struct netdev_flow_key *a,
const struct netdev_flow_key *b)
{
/* 'b->len' may be not set yet. */
return a->hash == b->hash && !memcmp(&a->mf, &b->mf, a->len);
}
/* Used to compare 'netdev_flow_key' in the exact match cache to a miniflow.
* The maps are compared bitwise, so both 'key->mf' 'mf' must have been
* generated by miniflow_extract. */
static inline bool
netdev_flow_key_equal_mf(const struct netdev_flow_key *key,
const struct miniflow *mf)
{
return !memcmp(&key->mf, mf, key->len);
}
static inline void
netdev_flow_key_clone(struct netdev_flow_key *dst,
const struct netdev_flow_key *src)
{
memcpy(dst, src,
offsetof(struct netdev_flow_key, mf) + src->len);
}
/* Slow. */
static void
netdev_flow_key_from_flow(struct netdev_flow_key *dst,
const struct flow *src)
{
struct dp_packet packet;
uint64_t buf_stub[512 / 8];
dp_packet_use_stub(&packet, buf_stub, sizeof buf_stub);
pkt_metadata_from_flow(&packet.md, src);
flow_compose(&packet, src);
miniflow_extract(&packet, &dst->mf);
dp_packet_uninit(&packet);
dst->len = netdev_flow_key_size(miniflow_n_values(&dst->mf));
dst->hash = 0; /* Not computed yet. */
}
/* Initialize a netdev_flow_key 'mask' from 'match'. */
static inline void
netdev_flow_mask_init(struct netdev_flow_key *mask,
const struct match *match)
{
uint64_t *dst = miniflow_values(&mask->mf);
struct flowmap fmap;
uint32_t hash = 0;
size_t idx;
/* Only check masks that make sense for the flow. */
flow_wc_map(&match->flow, &fmap);
flowmap_init(&mask->mf.map);
FLOWMAP_FOR_EACH_INDEX(idx, fmap) {
uint64_t mask_u64 = flow_u64_value(&match->wc.masks, idx);
if (mask_u64) {
flowmap_set(&mask->mf.map, idx, 1);
*dst++ = mask_u64;
hash = hash_add64(hash, mask_u64);
}
}
map_t map;
FLOWMAP_FOR_EACH_MAP (map, mask->mf.map) {
hash = hash_add64(hash, map);
}
size_t n = dst - miniflow_get_values(&mask->mf);
mask->hash = hash_finish(hash, n * 8);
mask->len = netdev_flow_key_size(n);
}
/* Initializes 'dst' as a copy of 'flow' masked with 'mask'. */
static inline void
netdev_flow_key_init_masked(struct netdev_flow_key *dst,
const struct flow *flow,
const struct netdev_flow_key *mask)
{
uint64_t *dst_u64 = miniflow_values(&dst->mf);
const uint64_t *mask_u64 = miniflow_get_values(&mask->mf);
uint32_t hash = 0;
uint64_t value;
dst->len = mask->len;
dst->mf = mask->mf; /* Copy maps. */
FLOW_FOR_EACH_IN_MAPS(value, flow, mask->mf.map) {
*dst_u64 = value & *mask_u64++;
hash = hash_add64(hash, *dst_u64++);
}
dst->hash = hash_finish(hash,
(dst_u64 - miniflow_get_values(&dst->mf)) * 8);
}
/* Iterate through netdev_flow_key TNL u64 values specified by 'FLOWMAP'. */
#define NETDEV_FLOW_KEY_FOR_EACH_IN_FLOWMAP(VALUE, KEY, FLOWMAP) \
MINIFLOW_FOR_EACH_IN_FLOWMAP(VALUE, &(KEY)->mf, FLOWMAP)
/* Returns a hash value for the bits of 'key' where there are 1-bits in
* 'mask'. */
static inline uint32_t
netdev_flow_key_hash_in_mask(const struct netdev_flow_key *key,
const struct netdev_flow_key *mask)
{
const uint64_t *p = miniflow_get_values(&mask->mf);
uint32_t hash = 0;
uint64_t value;
NETDEV_FLOW_KEY_FOR_EACH_IN_FLOWMAP(value, key, mask->mf.map) {
hash = hash_add64(hash, value & *p++);
}
return hash_finish(hash, (p - miniflow_get_values(&mask->mf)) * 8);
}
static inline bool
emc_entry_alive(struct emc_entry *ce)
{
return ce->flow && !ce->flow->dead;
}
static void
emc_clear_entry(struct emc_entry *ce)
{
if (ce->flow) {
dp_netdev_flow_unref(ce->flow);
ce->flow = NULL;
}
}
static inline void
emc_change_entry(struct emc_entry *ce, struct dp_netdev_flow *flow,
const struct netdev_flow_key *key)
{
if (ce->flow != flow) {
if (ce->flow) {
dp_netdev_flow_unref(ce->flow);
}
if (dp_netdev_flow_ref(flow)) {
ce->flow = flow;
} else {
ce->flow = NULL;
}
}
if (key) {
netdev_flow_key_clone(&ce->key, key);
}
}
static inline void
emc_insert(struct emc_cache *cache, const struct netdev_flow_key *key,
struct dp_netdev_flow *flow)
{
struct emc_entry *to_be_replaced = NULL;
struct emc_entry *current_entry;
EMC_FOR_EACH_POS_WITH_HASH(cache, current_entry, key->hash) {
if (netdev_flow_key_equal(&current_entry->key, key)) {
/* We found the entry with the 'mf' miniflow */
emc_change_entry(current_entry, flow, NULL);
return;
}
/* Replacement policy: put the flow in an empty (not alive) entry, or
* in the first entry where it can be */
if (!to_be_replaced
|| (emc_entry_alive(to_be_replaced)
&& !emc_entry_alive(current_entry))
|| current_entry->key.hash < to_be_replaced->key.hash) {
to_be_replaced = current_entry;
}
}
/* We didn't find the miniflow in the cache.
* The 'to_be_replaced' entry is where the new flow will be stored */
emc_change_entry(to_be_replaced, flow, key);
}
static inline struct dp_netdev_flow *
emc_lookup(struct emc_cache *cache, const struct netdev_flow_key *key)
{
struct emc_entry *current_entry;
EMC_FOR_EACH_POS_WITH_HASH(cache, current_entry, key->hash) {
if (current_entry->key.hash == key->hash
&& emc_entry_alive(current_entry)
&& netdev_flow_key_equal_mf(&current_entry->key, &key->mf)) {
/* We found the entry with the 'key->mf' miniflow */
return current_entry->flow;
}
}
return NULL;
}
static struct dp_netdev_flow *
dp_netdev_pmd_lookup_flow(const struct dp_netdev_pmd_thread *pmd,
const struct netdev_flow_key *key)
{
struct dp_netdev_flow *netdev_flow;
struct dpcls_rule *rule;
dpcls_lookup(&pmd->cls, key, &rule, 1);
netdev_flow = dp_netdev_flow_cast(rule);
return netdev_flow;
}
static struct dp_netdev_flow *
dp_netdev_pmd_find_flow(const struct dp_netdev_pmd_thread *pmd,
const ovs_u128 *ufidp, const struct nlattr *key,
size_t key_len)
{
struct dp_netdev_flow *netdev_flow;
struct flow flow;
ovs_u128 ufid;
/* If a UFID is not provided, determine one based on the key. */
if (!ufidp && key && key_len
&& !dpif_netdev_flow_from_nlattrs(key, key_len, &flow)) {
dpif_flow_hash(pmd->dp->dpif, &flow, sizeof flow, &ufid);
ufidp = &ufid;
}
if (ufidp) {
CMAP_FOR_EACH_WITH_HASH (netdev_flow, node, dp_netdev_flow_hash(ufidp),
&pmd->flow_table) {
if (ovs_u128_equals(&netdev_flow->ufid, ufidp)) {
return netdev_flow;
}
}
}
return NULL;
}
static void
get_dpif_flow_stats(const struct dp_netdev_flow *netdev_flow_,
struct dpif_flow_stats *stats)
{
struct dp_netdev_flow *netdev_flow;
unsigned long long n;
long long used;
uint16_t flags;
netdev_flow = CONST_CAST(struct dp_netdev_flow *, netdev_flow_);
atomic_read_relaxed(&netdev_flow->stats.packet_count, &n);
stats->n_packets = n;
atomic_read_relaxed(&netdev_flow->stats.byte_count, &n);
stats->n_bytes = n;
atomic_read_relaxed(&netdev_flow->stats.used, &used);
stats->used = used;
atomic_read_relaxed(&netdev_flow->stats.tcp_flags, &flags);
stats->tcp_flags = flags;
}
/* Converts to the dpif_flow format, using 'key_buf' and 'mask_buf' for
* storing the netlink-formatted key/mask. 'key_buf' may be the same as
* 'mask_buf'. Actions will be returned without copying, by relying on RCU to
* protect them. */
static void
dp_netdev_flow_to_dpif_flow(const struct dp_netdev_flow *netdev_flow,
struct ofpbuf *key_buf, struct ofpbuf *mask_buf,
struct dpif_flow *flow, bool terse)
{
if (terse) {
memset(flow, 0, sizeof *flow);
} else {
struct flow_wildcards wc;
struct dp_netdev_actions *actions;
size_t offset;
struct odp_flow_key_parms odp_parms = {
.flow = &netdev_flow->flow,
.mask = &wc.masks,
.support = dp_netdev_support,
};
miniflow_expand(&netdev_flow->cr.mask->mf, &wc.masks);
/* Key */
offset = key_buf->size;
flow->key = ofpbuf_tail(key_buf);
odp_parms.odp_in_port = netdev_flow->flow.in_port.odp_port;
odp_flow_key_from_flow(&odp_parms, key_buf);
flow->key_len = key_buf->size - offset;
/* Mask */
offset = mask_buf->size;
flow->mask = ofpbuf_tail(mask_buf);
odp_parms.odp_in_port = wc.masks.in_port.odp_port;
odp_parms.key_buf = key_buf;
odp_flow_key_from_mask(&odp_parms, mask_buf);
flow->mask_len = mask_buf->size - offset;
/* Actions */
actions = dp_netdev_flow_get_actions(netdev_flow);
flow->actions = actions->actions;
flow->actions_len = actions->size;
}
flow->ufid = netdev_flow->ufid;
flow->ufid_present = true;
flow->pmd_id = netdev_flow->pmd_id;
get_dpif_flow_stats(netdev_flow, &flow->stats);
}
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_wildcards *wc)
{
enum odp_key_fitness fitness;
fitness = odp_flow_key_to_mask_udpif(mask_key, mask_key_len, key,
key_len, wc, flow);
if (fitness) {
/* This should not happen: it indicates that
* odp_flow_key_from_mask() and odp_flow_key_to_mask()
* disagree on the acceptable form of a mask. Log the problem
* as an error, with enough details to enable debugging. */
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
if (!VLOG_DROP_ERR(&rl)) {
struct ds s;
ds_init(&s);
odp_flow_format(key, key_len, mask_key, mask_key_len, NULL, &s,
true);
VLOG_ERR("internal error parsing flow mask %s (%s)",
ds_cstr(&s), odp_key_fitness_to_string(fitness));
ds_destroy(&s);
}
return EINVAL;
}
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_udpif(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;
}
/* Userspace datapath doesn't support conntrack. */
if (flow->ct_state || flow->ct_zone || flow->ct_mark
|| !ovs_u128_is_zero(&flow->ct_label)) {
return EINVAL;
}
return 0;
}
static int
dpif_netdev_flow_get(const struct dpif *dpif, const struct dpif_flow_get *get)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct dp_netdev_pmd_thread *pmd;
unsigned pmd_id = get->pmd_id == PMD_ID_NULL
? NON_PMD_CORE_ID : get->pmd_id;
int error = 0;
pmd = dp_netdev_get_pmd(dp, pmd_id);
if (!pmd) {
return EINVAL;
}
netdev_flow = dp_netdev_pmd_find_flow(pmd, get->ufid, get->key,
get->key_len);
if (netdev_flow) {
dp_netdev_flow_to_dpif_flow(netdev_flow, get->buffer, get->buffer,
get->flow, false);
} else {
error = ENOENT;
}
dp_netdev_pmd_unref(pmd);
return error;
}
static struct dp_netdev_flow *
dp_netdev_flow_add(struct dp_netdev_pmd_thread *pmd,
struct match *match, const ovs_u128 *ufid,
const struct nlattr *actions, size_t actions_len)
OVS_REQUIRES(pmd->flow_mutex)
{
struct dp_netdev_flow *flow;
struct netdev_flow_key mask;
netdev_flow_mask_init(&mask, match);
/* Make sure wc does not have metadata. */
ovs_assert(!FLOWMAP_HAS_FIELD(&mask.mf.map, metadata)
&& !FLOWMAP_HAS_FIELD(&mask.mf.map, regs));
/* Do not allocate extra space. */
flow = xmalloc(sizeof *flow - sizeof flow->cr.flow.mf + mask.len);
memset(&flow->stats, 0, sizeof flow->stats);
flow->dead = false;
flow->batch = NULL;
*CONST_CAST(unsigned *, &flow->pmd_id) = pmd->core_id;
*CONST_CAST(struct flow *, &flow->flow) = match->flow;
*CONST_CAST(ovs_u128 *, &flow->ufid) = *ufid;
ovs_refcount_init(&flow->ref_cnt);
ovsrcu_set(&flow->actions, dp_netdev_actions_create(actions, actions_len));
netdev_flow_key_init_masked(&flow->cr.flow, &match->flow, &mask);
dpcls_insert(&pmd->cls, &flow->cr, &mask);
cmap_insert(&pmd->flow_table, CONST_CAST(struct cmap_node *, &flow->node),
dp_netdev_flow_hash(&flow->ufid));
if (OVS_UNLIKELY(VLOG_IS_DBG_ENABLED())) {
struct match match;
struct ds ds = DS_EMPTY_INITIALIZER;
match.tun_md.valid = false;
match.flow = flow->flow;
miniflow_expand(&flow->cr.mask->mf, &match.wc.masks);
ds_put_cstr(&ds, "flow_add: ");
odp_format_ufid(ufid, &ds);
ds_put_cstr(&ds, " ");
match_format(&match, &ds, OFP_DEFAULT_PRIORITY);
ds_put_cstr(&ds, ", actions:");
format_odp_actions(&ds, actions, actions_len);
VLOG_DBG_RL(&upcall_rl, "%s", ds_cstr(&ds));
ds_destroy(&ds);
}
return flow;
}
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 netdev_flow_key key;
struct dp_netdev_pmd_thread *pmd;
struct match match;
ovs_u128 ufid;
unsigned pmd_id = put->pmd_id == PMD_ID_NULL
? NON_PMD_CORE_ID : put->pmd_id;
int error;
error = dpif_netdev_flow_from_nlattrs(put->key, put->key_len, &match.flow);
if (error) {
return error;
}
error = dpif_netdev_mask_from_nlattrs(put->key, put->key_len,
put->mask, put->mask_len,
&match.flow, &match.wc);
if (error) {
return error;
}
pmd = dp_netdev_get_pmd(dp, pmd_id);
if (!pmd) {
return EINVAL;
}
/* Must produce a netdev_flow_key for lookup.
* This interface is no longer performance critical, since it is not used
* for upcall processing any more. */
netdev_flow_key_from_flow(&key, &match.flow);
if (put->ufid) {
ufid = *put->ufid;
} else {
dpif_flow_hash(dpif, &match.flow, sizeof match.flow, &ufid);
}
ovs_mutex_lock(&pmd->flow_mutex);
netdev_flow = dp_netdev_pmd_lookup_flow(pmd, &key);
if (!netdev_flow) {
if (put->flags & DPIF_FP_CREATE) {
if (cmap_count(&pmd->flow_table) < MAX_FLOWS) {
if (put->stats) {
memset(put->stats, 0, sizeof *put->stats);
}
dp_netdev_flow_add(pmd, &match, &ufid, put->actions,
put->actions_len);
error = 0;
} else {
error = EFBIG;
}
} else {
error = ENOENT;
}
} else {
if (put->flags & DPIF_FP_MODIFY
&& flow_equal(&match.flow, &netdev_flow->flow)) {
struct dp_netdev_actions *new_actions;
struct dp_netdev_actions *old_actions;
new_actions = dp_netdev_actions_create(put->actions,
put->actions_len);
old_actions = dp_netdev_flow_get_actions(netdev_flow);
ovsrcu_set(&netdev_flow->actions, new_actions);
if (put->stats) {
get_dpif_flow_stats(netdev_flow, put->stats);
}
if (put->flags & DPIF_FP_ZERO_STATS) {
/* XXX: The userspace datapath uses thread local statistics
* (for flows), which should be updated only by the owning
* thread. Since we cannot write on stats memory here,
* we choose not to support this flag. Please note:
* - This feature is currently used only by dpctl commands with
* option --clear.
* - Should the need arise, this operation can be implemented
* by keeping a base value (to be update here) for each
* counter, and subtracting it before outputting the stats */
error = EOPNOTSUPP;
}
ovsrcu_postpone(dp_netdev_actions_free, old_actions);
} else if (put->flags & DPIF_FP_CREATE) {
error = EEXIST;
} else {
/* Overlapping flow. */
error = EINVAL;
}
}
ovs_mutex_unlock(&pmd->flow_mutex);
dp_netdev_pmd_unref(pmd);
return error;
}
static int
dpif_netdev_flow_del(struct dpif *dpif, const struct dpif_flow_del *del)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_flow *netdev_flow;
struct dp_netdev_pmd_thread *pmd;
unsigned pmd_id = del->pmd_id == PMD_ID_NULL
? NON_PMD_CORE_ID : del->pmd_id;
int error = 0;
pmd = dp_netdev_get_pmd(dp, pmd_id);
if (!pmd) {
return EINVAL;
}
ovs_mutex_lock(&pmd->flow_mutex);
netdev_flow = dp_netdev_pmd_find_flow(pmd, del->ufid, del->key,
del->key_len);
if (netdev_flow) {
if (del->stats) {
get_dpif_flow_stats(netdev_flow, del->stats);
}
dp_netdev_pmd_remove_flow(pmd, netdev_flow);
} else {
error = ENOENT;
}
ovs_mutex_unlock(&pmd->flow_mutex);
dp_netdev_pmd_unref(pmd);
return error;
}
struct dpif_netdev_flow_dump {
struct dpif_flow_dump up;
struct cmap_position poll_thread_pos;
struct cmap_position flow_pos;
struct dp_netdev_pmd_thread *cur_pmd;
int status;
struct ovs_mutex mutex;
};
static struct dpif_netdev_flow_dump *
dpif_netdev_flow_dump_cast(struct dpif_flow_dump *dump)
{
return CONTAINER_OF(dump, struct dpif_netdev_flow_dump, up);
}
static struct dpif_flow_dump *
dpif_netdev_flow_dump_create(const struct dpif *dpif_, bool terse)
{
struct dpif_netdev_flow_dump *dump;
dump = xzalloc(sizeof *dump);
dpif_flow_dump_init(&dump->up, dpif_);
dump->up.terse = terse;
ovs_mutex_init(&dump->mutex);
return &dump->up;
}
static int
dpif_netdev_flow_dump_destroy(struct dpif_flow_dump *dump_)
{
struct dpif_netdev_flow_dump *dump = dpif_netdev_flow_dump_cast(dump_);
ovs_mutex_destroy(&dump->mutex);
free(dump);
return 0;
}
struct dpif_netdev_flow_dump_thread {
struct dpif_flow_dump_thread up;
struct dpif_netdev_flow_dump *dump;
struct odputil_keybuf keybuf[FLOW_DUMP_MAX_BATCH];
struct odputil_keybuf maskbuf[FLOW_DUMP_MAX_BATCH];
};
static struct dpif_netdev_flow_dump_thread *
dpif_netdev_flow_dump_thread_cast(struct dpif_flow_dump_thread *thread)
{
return CONTAINER_OF(thread, struct dpif_netdev_flow_dump_thread, up);
}
static struct dpif_flow_dump_thread *
dpif_netdev_flow_dump_thread_create(struct dpif_flow_dump *dump_)
{
struct dpif_netdev_flow_dump *dump = dpif_netdev_flow_dump_cast(dump_);
struct dpif_netdev_flow_dump_thread *thread;
thread = xmalloc(sizeof *thread);
dpif_flow_dump_thread_init(&thread->up, &dump->up);
thread->dump = dump;
return &thread->up;
}
static void
dpif_netdev_flow_dump_thread_destroy(struct dpif_flow_dump_thread *thread_)
{
struct dpif_netdev_flow_dump_thread *thread
= dpif_netdev_flow_dump_thread_cast(thread_);
free(thread);
}
static int
dpif_netdev_flow_dump_next(struct dpif_flow_dump_thread *thread_,
struct dpif_flow *flows, int max_flows)
{
struct dpif_netdev_flow_dump_thread *thread
= dpif_netdev_flow_dump_thread_cast(thread_);
struct dpif_netdev_flow_dump *dump = thread->dump;
struct dp_netdev_flow *netdev_flows[FLOW_DUMP_MAX_BATCH];
int n_flows = 0;
int i;
ovs_mutex_lock(&dump->mutex);
if (!dump->status) {
struct dpif_netdev *dpif = dpif_netdev_cast(thread->up.dpif);
struct dp_netdev *dp = get_dp_netdev(&dpif->dpif);
struct dp_netdev_pmd_thread *pmd = dump->cur_pmd;
int flow_limit = MIN(max_flows, FLOW_DUMP_MAX_BATCH);
/* First call to dump_next(), extracts the first pmd thread.
* If there is no pmd thread, returns immediately. */
if (!pmd) {
pmd = dp_netdev_pmd_get_next(dp, &dump->poll_thread_pos);
if (!pmd) {
ovs_mutex_unlock(&dump->mutex);
return n_flows;
}
}
do {
for (n_flows = 0; n_flows < flow_limit; n_flows++) {
struct cmap_node *node;
node = cmap_next_position(&pmd->flow_table, &dump->flow_pos);
if (!node) {
break;
}
netdev_flows[n_flows] = CONTAINER_OF(node,
struct dp_netdev_flow,
node);
}
/* When finishing dumping the current pmd thread, moves to
* the next. */
if (n_flows < flow_limit) {
memset(&dump->flow_pos, 0, sizeof dump->flow_pos);
dp_netdev_pmd_unref(pmd);
pmd = dp_netdev_pmd_get_next(dp, &dump->poll_thread_pos);
if (!pmd) {
dump->status = EOF;
break;
}
}
/* Keeps the reference to next caller. */
dump->cur_pmd = pmd;
/* If the current dump is empty, do not exit the loop, since the
* remaining pmds could have flows to be dumped. Just dumps again
* on the new 'pmd'. */
} while (!n_flows);
}
ovs_mutex_unlock(&dump->mutex);
for (i = 0; i < n_flows; i++) {
struct odputil_keybuf *maskbuf = &thread->maskbuf[i];
struct odputil_keybuf *keybuf = &thread->keybuf[i];
struct dp_netdev_flow *netdev_flow = netdev_flows[i];
struct dpif_flow *f = &flows[i];
struct ofpbuf key, mask;
ofpbuf_use_stack(&key, keybuf, sizeof *keybuf);
ofpbuf_use_stack(&mask, maskbuf, sizeof *maskbuf);
dp_netdev_flow_to_dpif_flow(netdev_flow, &key, &mask, f,
dump->up.terse);
}
return n_flows;
}
static int
dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_pmd_thread *pmd;
struct dp_packet *pp;
if (dp_packet_size(execute->packet) < ETH_HEADER_LEN ||
dp_packet_size(execute->packet) > UINT16_MAX) {
return EINVAL;
}
/* Tries finding the 'pmd'. If NULL is returned, that means
* the current thread is a non-pmd thread and should use
* dp_netdev_get_pmd(dp, NON_PMD_CORE_ID). */
pmd = ovsthread_getspecific(dp->per_pmd_key);
if (!pmd) {
pmd = dp_netdev_get_pmd(dp, NON_PMD_CORE_ID);
}
/* If the current thread is non-pmd thread, acquires
* the 'non_pmd_mutex'. */
if (pmd->core_id == NON_PMD_CORE_ID) {
ovs_mutex_lock(&dp->non_pmd_mutex);
ovs_mutex_lock(&dp->port_mutex);
}
pp = execute->packet;
dp_netdev_execute_actions(pmd, &pp, 1, false, execute->actions,
execute->actions_len);
if (pmd->core_id == NON_PMD_CORE_ID) {
dp_netdev_pmd_unref(pmd);
ovs_mutex_unlock(&dp->port_mutex);
ovs_mutex_unlock(&dp->non_pmd_mutex);
}
return 0;
}
static void
dpif_netdev_operate(struct dpif *dpif, struct dpif_op **ops, size_t n_ops)
{
size_t i;
for (i = 0; i < n_ops; i++) {
struct dpif_op *op = ops[i];
switch (op->type) {
case DPIF_OP_FLOW_PUT:
op->error = dpif_netdev_flow_put(dpif, &op->u.flow_put);
break;
case DPIF_OP_FLOW_DEL:
op->error = dpif_netdev_flow_del(dpif, &op->u.flow_del);
break;
case DPIF_OP_EXECUTE:
op->error = dpif_netdev_execute(dpif, &op->u.execute);
break;
case DPIF_OP_FLOW_GET:
op->error = dpif_netdev_flow_get(dpif, &op->u.flow_get);
break;
}
}
}
/* Returns true if the configuration for rx queues or cpu mask
* is changed. */
static bool
pmd_config_changed(const struct dp_netdev *dp, const char *cmask)
{
struct dp_netdev_port *port;
CMAP_FOR_EACH (port, node, &dp->ports) {
struct netdev *netdev = port->netdev;
int requested_n_rxq = netdev_requested_n_rxq(netdev);
if (netdev_is_pmd(netdev)
&& port->latest_requested_n_rxq != requested_n_rxq) {
return true;
}
}
if (dp->pmd_cmask != NULL && cmask != NULL) {
return strcmp(dp->pmd_cmask, cmask);
} else {
return (dp->pmd_cmask != NULL || cmask != NULL);
}
}
/* Resets pmd threads if the configuration for 'rxq's or cpu mask changes. */
static int
dpif_netdev_pmd_set(struct dpif *dpif, const char *cmask)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
if (pmd_config_changed(dp, cmask)) {
struct dp_netdev_port *port;
dp_netdev_destroy_all_pmds(dp);
CMAP_FOR_EACH (port, node, &dp->ports) {
struct netdev *netdev = port->netdev;
int requested_n_rxq = netdev_requested_n_rxq(netdev);
if (netdev_is_pmd(port->netdev)
&& port->latest_requested_n_rxq != requested_n_rxq) {
int i, err;
/* Closes the existing 'rxq's. */
for (i = 0; i < netdev_n_rxq(port->netdev); i++) {
netdev_rxq_close(port->rxq[i]);
port->rxq[i] = NULL;
}
/* Sets the new rx queue config. */
err = netdev_set_multiq(port->netdev,
ovs_numa_get_n_cores() + 1,
requested_n_rxq);
if (err && (err != EOPNOTSUPP)) {
VLOG_ERR("Failed to set dpdk interface %s rx_queue to:"
" %u", netdev_get_name(port->netdev),
requested_n_rxq);
return err;
}
port->latest_requested_n_rxq = requested_n_rxq;
/* If the set_multiq() above succeeds, reopens the 'rxq's. */
port->rxq = xrealloc(port->rxq, sizeof *port->rxq
* netdev_n_rxq(port->netdev));
for (i = 0; i < netdev_n_rxq(port->netdev); i++) {
netdev_rxq_open(port->netdev, &port->rxq[i], i);
}
}
}
/* Reconfigures the cpu mask. */
ovs_numa_set_cpu_mask(cmask);
free(dp->pmd_cmask);
dp->pmd_cmask = cmask ? xstrdup(cmask) : NULL;
/* Restores the non-pmd. */
dp_netdev_set_nonpmd(dp);
/* Restores all pmd threads. */
dp_netdev_reset_pmd_threads(dp);
}
return 0;
}
static int
dpif_netdev_queue_to_priority(const struct dpif *dpif OVS_UNUSED,
uint32_t queue_id, uint32_t *priority)
{
*priority = queue_id;
return 0;
}
/* Creates and returns a new 'struct dp_netdev_actions', whose actions are
* a copy of the 'ofpacts_len' bytes of 'ofpacts'. */
struct dp_netdev_actions *
dp_netdev_actions_create(const struct nlattr *actions, size_t size)
{
struct dp_netdev_actions *netdev_actions;
netdev_actions = xmalloc(sizeof *netdev_actions + size);
memcpy(netdev_actions->actions, actions, size);
netdev_actions->size = size;
return netdev_actions;
}
struct dp_netdev_actions *
dp_netdev_flow_get_actions(const struct dp_netdev_flow *flow)
{
return ovsrcu_get(struct dp_netdev_actions *, &flow->actions);
}
static void
dp_netdev_actions_free(struct dp_netdev_actions *actions)
{
free(actions);
}
static inline unsigned long long
cycles_counter(void)
{
#ifdef DPDK_NETDEV
return rte_get_tsc_cycles();
#else
return 0;
#endif
}
/* Fake mutex to make sure that the calls to cycles_count_* are balanced */
extern struct ovs_mutex cycles_counter_fake_mutex;
/* Start counting cycles. Must be followed by 'cycles_count_end()' */
static inline void
cycles_count_start(struct dp_netdev_pmd_thread *pmd)
OVS_ACQUIRES(&cycles_counter_fake_mutex)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
pmd->last_cycles = cycles_counter();
}
/* Stop counting cycles and add them to the counter 'type' */
static inline void
cycles_count_end(struct dp_netdev_pmd_thread *pmd,
enum pmd_cycles_counter_type type)
OVS_RELEASES(&cycles_counter_fake_mutex)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
unsigned long long interval = cycles_counter() - pmd->last_cycles;
non_atomic_ullong_add(&pmd->cycles.n[type], interval);
}
static void
dp_netdev_process_rxq_port(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev_port *port,
struct netdev_rxq *rxq)
{
struct dp_packet *packets[NETDEV_MAX_BURST];
int error, cnt;
cycles_count_start(pmd);
error = netdev_rxq_recv(rxq, packets, &cnt);
cycles_count_end(pmd, PMD_CYCLES_POLLING);
if (!error) {
*recirc_depth_get() = 0;
cycles_count_start(pmd);
dp_netdev_input(pmd, packets, cnt, port->port_no);
cycles_count_end(pmd, PMD_CYCLES_PROCESSING);
} else if (error != EAGAIN && error != EOPNOTSUPP) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
VLOG_ERR_RL(&rl, "error receiving data from %s: %s",
netdev_get_name(port->netdev), ovs_strerror(error));
}
}
/* Return true if needs to revalidate datapath flows. */
static bool
dpif_netdev_run(struct dpif *dpif)
{
struct dp_netdev_port *port;
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_pmd_thread *non_pmd = dp_netdev_get_pmd(dp,
NON_PMD_CORE_ID);
uint64_t new_tnl_seq;
ovs_mutex_lock(&dp->non_pmd_mutex);
CMAP_FOR_EACH (port, node, &dp->ports) {
if (!netdev_is_pmd(port->netdev)) {
int i;
for (i = 0; i < netdev_n_rxq(port->netdev); i++) {
dp_netdev_process_rxq_port(non_pmd, port, port->rxq[i]);
}
}
}
ovs_mutex_unlock(&dp->non_pmd_mutex);
dp_netdev_pmd_unref(non_pmd);
tnl_neigh_cache_run();
tnl_port_map_run();
new_tnl_seq = seq_read(tnl_conf_seq);
if (dp->last_tnl_conf_seq != new_tnl_seq) {
dp->last_tnl_conf_seq = new_tnl_seq;
return true;
}
return false;
}
static void
dpif_netdev_wait(struct dpif *dpif)
{
struct dp_netdev_port *port;
struct dp_netdev *dp = get_dp_netdev(dpif);
ovs_mutex_lock(&dp_netdev_mutex);
CMAP_FOR_EACH (port, node, &dp->ports) {
if (!netdev_is_pmd(port->netdev)) {
int i;
for (i = 0; i < netdev_n_rxq(port->netdev); i++) {
netdev_rxq_wait(port->rxq[i]);
}
}
}
ovs_mutex_unlock(&dp_netdev_mutex);
seq_wait(tnl_conf_seq, dp->last_tnl_conf_seq);
}
static int
pmd_load_queues(struct dp_netdev_pmd_thread *pmd,
struct rxq_poll **ppoll_list, int poll_cnt)
OVS_REQUIRES(pmd->poll_mutex)
{
struct rxq_poll *poll_list = *ppoll_list;
struct rxq_poll *poll;
int i;
for (i = 0; i < poll_cnt; i++) {
port_unref(poll_list[i].port);
}
poll_list = xrealloc(poll_list, pmd->poll_cnt * sizeof *poll_list);
i = 0;
LIST_FOR_EACH (poll, node, &pmd->poll_list) {
port_ref(poll->port);
poll_list[i++] = *poll;
}
*ppoll_list = poll_list;
return pmd->poll_cnt;
}
static void *
pmd_thread_main(void *f_)
{
struct dp_netdev_pmd_thread *pmd = f_;
unsigned int lc = 0;
struct rxq_poll *poll_list;
unsigned int port_seq = PMD_INITIAL_SEQ;
int poll_cnt;
int i;
poll_cnt = 0;
poll_list = NULL;
/* Stores the pmd thread's 'pmd' to 'per_pmd_key'. */
ovsthread_setspecific(pmd->dp->per_pmd_key, pmd);
pmd_thread_setaffinity_cpu(pmd->core_id);
reload:
emc_cache_init(&pmd->flow_cache);
ovs_mutex_lock(&pmd->poll_mutex);
poll_cnt = pmd_load_queues(pmd, &poll_list, poll_cnt);
ovs_mutex_unlock(&pmd->poll_mutex);
/* List port/core affinity */
for (i = 0; i < poll_cnt; i++) {
VLOG_DBG("Core %d processing port \'%s\' with queue-id %d\n",
pmd->core_id, netdev_get_name(poll_list[i].port->netdev),
netdev_rxq_get_queue_id(poll_list[i].rx));
}
/* Signal here to make sure the pmd finishes
* reloading the updated configuration. */
dp_netdev_pmd_reload_done(pmd);
for (;;) {
for (i = 0; i < poll_cnt; i++) {
dp_netdev_process_rxq_port(pmd, poll_list[i].port, poll_list[i].rx);
}
if (lc++ > 1024) {
unsigned int seq;
lc = 0;
emc_cache_slow_sweep(&pmd->flow_cache);
coverage_try_clear();
ovsrcu_quiesce();
atomic_read_relaxed(&pmd->change_seq, &seq);
if (seq != port_seq) {
port_seq = seq;
break;
}
}
}
emc_cache_uninit(&pmd->flow_cache);
if (!latch_is_set(&pmd->exit_latch)){
goto reload;
}
for (i = 0; i < poll_cnt; i++) {
port_unref(poll_list[i].port);
}
dp_netdev_pmd_reload_done(pmd);
free(poll_list);
return NULL;
}
static void
dp_netdev_disable_upcall(struct dp_netdev *dp)
OVS_ACQUIRES(dp->upcall_rwlock)
{
fat_rwlock_wrlock(&dp->upcall_rwlock);
}
static void
dpif_netdev_disable_upcall(struct dpif *dpif)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_disable_upcall(dp);
}
static void
dp_netdev_enable_upcall(struct dp_netdev *dp)
OVS_RELEASES(dp->upcall_rwlock)
{
fat_rwlock_unlock(&dp->upcall_rwlock);
}
static void
dpif_netdev_enable_upcall(struct dpif *dpif)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp_netdev_enable_upcall(dp);
}
static void
dp_netdev_pmd_reload_done(struct dp_netdev_pmd_thread *pmd)
{
ovs_mutex_lock(&pmd->cond_mutex);
xpthread_cond_signal(&pmd->cond);
ovs_mutex_unlock(&pmd->cond_mutex);
}
/* Finds and refs the dp_netdev_pmd_thread on core 'core_id'. Returns
* the pointer if succeeds, otherwise, NULL.
*
* Caller must unrefs the returned reference. */
static struct dp_netdev_pmd_thread *
dp_netdev_get_pmd(struct dp_netdev *dp, unsigned core_id)
{
struct dp_netdev_pmd_thread *pmd;
const struct cmap_node *pnode;
pnode = cmap_find(&dp->poll_threads, hash_int(core_id, 0));
if (!pnode) {
return NULL;
}
pmd = CONTAINER_OF(pnode, struct dp_netdev_pmd_thread, node);
return dp_netdev_pmd_try_ref(pmd) ? pmd : NULL;
}
/* Sets the 'struct dp_netdev_pmd_thread' for non-pmd threads. */
static void
dp_netdev_set_nonpmd(struct dp_netdev *dp)
{
struct dp_netdev_pmd_thread *non_pmd;
non_pmd = xzalloc(sizeof *non_pmd);
dp_netdev_configure_pmd(non_pmd, dp, 0, NON_PMD_CORE_ID,
OVS_NUMA_UNSPEC);
}
/* Caller must have valid pointer to 'pmd'. */
static bool
dp_netdev_pmd_try_ref(struct dp_netdev_pmd_thread *pmd)
{
return ovs_refcount_try_ref_rcu(&pmd->ref_cnt);
}
static void
dp_netdev_pmd_unref(struct dp_netdev_pmd_thread *pmd)
{
if (pmd && ovs_refcount_unref(&pmd->ref_cnt) == 1) {
ovsrcu_postpone(dp_netdev_destroy_pmd, pmd);
}
}
/* Given cmap position 'pos', tries to ref the next node. If try_ref()
* fails, keeps checking for next node until reaching the end of cmap.
*
* Caller must unrefs the returned reference. */
static struct dp_netdev_pmd_thread *
dp_netdev_pmd_get_next(struct dp_netdev *dp, struct cmap_position *pos)
{
struct dp_netdev_pmd_thread *next;
do {
struct cmap_node *node;
node = cmap_next_position(&dp->poll_threads, pos);
next = node ? CONTAINER_OF(node, struct dp_netdev_pmd_thread, node)
: NULL;
} while (next && !dp_netdev_pmd_try_ref(next));
return next;
}
/* Configures the 'pmd' based on the input argument. */
static void
dp_netdev_configure_pmd(struct dp_netdev_pmd_thread *pmd, struct dp_netdev *dp,
int index, unsigned core_id, int numa_id)
{
pmd->dp = dp;
pmd->index = index;
pmd->core_id = core_id;
pmd->numa_id = numa_id;
pmd->poll_cnt = 0;
atomic_init(&pmd->tx_qid,
(core_id == NON_PMD_CORE_ID)
? ovs_numa_get_n_cores()
: get_n_pmd_threads(dp));
ovs_refcount_init(&pmd->ref_cnt);
latch_init(&pmd->exit_latch);
atomic_init(&pmd->change_seq, PMD_INITIAL_SEQ);
xpthread_cond_init(&pmd->cond, NULL);
ovs_mutex_init(&pmd->cond_mutex);
ovs_mutex_init(&pmd->flow_mutex);
ovs_mutex_init(&pmd->poll_mutex);
dpcls_init(&pmd->cls);
cmap_init(&pmd->flow_table);
list_init(&pmd->poll_list);
/* init the 'flow_cache' since there is no
* actual thread created for NON_PMD_CORE_ID. */
if (core_id == NON_PMD_CORE_ID) {
emc_cache_init(&pmd->flow_cache);
}
cmap_insert(&dp->poll_threads, CONST_CAST(struct cmap_node *, &pmd->node),
hash_int(core_id, 0));
}
static void
dp_netdev_destroy_pmd(struct dp_netdev_pmd_thread *pmd)
{
dp_netdev_pmd_flow_flush(pmd);
dpcls_destroy(&pmd->cls);
cmap_destroy(&pmd->flow_table);
ovs_mutex_destroy(&pmd->flow_mutex);
latch_destroy(&pmd->exit_latch);
xpthread_cond_destroy(&pmd->cond);
ovs_mutex_destroy(&pmd->cond_mutex);
ovs_mutex_destroy(&pmd->poll_mutex);
free(pmd);
}
/* Stops the pmd thread, removes it from the 'dp->poll_threads',
* and unrefs the struct. */
static void
dp_netdev_del_pmd(struct dp_netdev *dp, struct dp_netdev_pmd_thread *pmd)
{
struct rxq_poll *poll;
/* Uninit the 'flow_cache' since there is
* no actual thread uninit it for NON_PMD_CORE_ID. */
if (pmd->core_id == NON_PMD_CORE_ID) {
emc_cache_uninit(&pmd->flow_cache);
} else {
latch_set(&pmd->exit_latch);
dp_netdev_reload_pmd__(pmd);
ovs_numa_unpin_core(pmd->core_id);
xpthread_join(pmd->thread, NULL);
}
/* Unref all ports and free poll_list. */
LIST_FOR_EACH_POP (poll, node, &pmd->poll_list) {
port_unref(poll->port);
free(poll);
}
/* Purges the 'pmd''s flows after stopping the thread, but before
* destroying the flows, so that the flow stats can be collected. */
if (dp->dp_purge_cb) {
dp->dp_purge_cb(dp->dp_purge_aux, pmd->core_id);
}
cmap_remove(&pmd->dp->poll_threads, &pmd->node, hash_int(pmd->core_id, 0));
dp_netdev_pmd_unref(pmd);
}
/* Destroys all pmd threads. */
static void
dp_netdev_destroy_all_pmds(struct dp_netdev *dp)
{
struct dp_netdev_pmd_thread *pmd;
struct dp_netdev_pmd_thread **pmd_list;
size_t k = 0, n_pmds;
n_pmds = cmap_count(&dp->poll_threads);
pmd_list = xcalloc(n_pmds, sizeof *pmd_list);
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
/* We cannot call dp_netdev_del_pmd(), since it alters
* 'dp->poll_threads' (while we're iterating it) and it
* might quiesce. */
ovs_assert(k < n_pmds);
pmd_list[k++] = pmd;
}
for (size_t i = 0; i < k; i++) {
dp_netdev_del_pmd(dp, pmd_list[i]);
}
free(pmd_list);
}
/* Deletes all pmd threads on numa node 'numa_id' and
* fixes tx_qids of other threads to keep them sequential. */
static void
dp_netdev_del_pmds_on_numa(struct dp_netdev *dp, int numa_id)
{
struct dp_netdev_pmd_thread *pmd;
int n_pmds_on_numa, n_pmds;
int *free_idx, k = 0;
struct dp_netdev_pmd_thread **pmd_list;
n_pmds_on_numa = get_n_pmd_threads_on_numa(dp, numa_id);
free_idx = xcalloc(n_pmds_on_numa, sizeof *free_idx);
pmd_list = xcalloc(n_pmds_on_numa, sizeof *pmd_list);
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
/* We cannot call dp_netdev_del_pmd(), since it alters
* 'dp->poll_threads' (while we're iterating it) and it
* might quiesce. */
if (pmd->numa_id == numa_id) {
atomic_read_relaxed(&pmd->tx_qid, &free_idx[k]);
pmd_list[k] = pmd;
ovs_assert(k < n_pmds_on_numa);
k++;
}
}
for (int i = 0; i < k; i++) {
dp_netdev_del_pmd(dp, pmd_list[i]);
}
n_pmds = get_n_pmd_threads(dp);
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
int old_tx_qid;
atomic_read_relaxed(&pmd->tx_qid, &old_tx_qid);
if (old_tx_qid >= n_pmds) {
int new_tx_qid = free_idx[--k];
atomic_store_relaxed(&pmd->tx_qid, new_tx_qid);
}
}
free(pmd_list);
free(free_idx);
}
/* Returns PMD thread from this numa node with fewer rx queues to poll.
* Returns NULL if there is no PMD threads on this numa node.
* Can be called safely only by main thread. */
static struct dp_netdev_pmd_thread *
dp_netdev_less_loaded_pmd_on_numa(struct dp_netdev *dp, int numa_id)
{
int min_cnt = -1;
struct dp_netdev_pmd_thread *pmd, *res = NULL;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
if (pmd->numa_id == numa_id
&& (min_cnt > pmd->poll_cnt || res == NULL)) {
min_cnt = pmd->poll_cnt;
res = pmd;
}
}
return res;
}
/* Adds rx queue to poll_list of PMD thread. */
static void
dp_netdev_add_rxq_to_pmd(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev_port *port, struct netdev_rxq *rx)
OVS_REQUIRES(pmd->poll_mutex)
{
struct rxq_poll *poll = xmalloc(sizeof *poll);
port_ref(port);
poll->port = port;
poll->rx = rx;
list_push_back(&pmd->poll_list, &poll->node);
pmd->poll_cnt++;
}
/* Checks the numa node id of 'netdev' and starts pmd threads for
* the numa node. */
static void
dp_netdev_set_pmds_on_numa(struct dp_netdev *dp, int numa_id)
{
int n_pmds;
if (!ovs_numa_numa_id_is_valid(numa_id)) {
VLOG_ERR("Cannot create pmd threads due to numa id (%d)"
"invalid", numa_id);
return ;
}
n_pmds = get_n_pmd_threads_on_numa(dp, numa_id);
/* If there are already pmd threads created for the numa node
* in which 'netdev' is on, do nothing. Else, creates the
* pmd threads for the numa node. */
if (!n_pmds) {
int can_have, n_unpinned, i, index = 0;
struct dp_netdev_pmd_thread **pmds;
struct dp_netdev_port *port;
n_unpinned = ovs_numa_get_n_unpinned_cores_on_numa(numa_id);
if (!n_unpinned) {
VLOG_ERR("Cannot create pmd threads due to out of unpinned "
"cores on numa node");
return;
}
/* If cpu mask is specified, uses all unpinned cores, otherwise
* tries creating NR_PMD_THREADS pmd threads. */
can_have = dp->pmd_cmask ? n_unpinned : MIN(n_unpinned, NR_PMD_THREADS);
pmds = xzalloc(can_have * sizeof *pmds);
for (i = 0; i < can_have; i++) {
unsigned core_id = ovs_numa_get_unpinned_core_on_numa(numa_id);
pmds[i] = xzalloc(sizeof **pmds);
dp_netdev_configure_pmd(pmds[i], dp, i, core_id, numa_id);
}
/* Distributes rx queues of this numa node between new pmd threads. */
CMAP_FOR_EACH (port, node, &dp->ports) {
if (netdev_is_pmd(port->netdev)
&& netdev_get_numa_id(port->netdev) == numa_id) {
for (i = 0; i < netdev_n_rxq(port->netdev); i++) {
/* Make thread-safety analyser happy. */
ovs_mutex_lock(&pmds[index]->poll_mutex);
dp_netdev_add_rxq_to_pmd(pmds[index], port, port->rxq[i]);
ovs_mutex_unlock(&pmds[index]->poll_mutex);
index = (index + 1) % can_have;
}
}
}
/* Actual start of pmd threads. */
for (i = 0; i < can_have; i++) {
pmds[i]->thread = ovs_thread_create("pmd", pmd_thread_main, pmds[i]);
}
free(pmds);
VLOG_INFO("Created %d pmd threads on numa node %d", can_have, numa_id);
}
}
/* Called after pmd threads config change. Restarts pmd threads with
* new configuration. */
static void
dp_netdev_reset_pmd_threads(struct dp_netdev *dp)
{
struct dp_netdev_port *port;
CMAP_FOR_EACH (port, node, &dp->ports) {
if (netdev_is_pmd(port->netdev)) {
int numa_id = netdev_get_numa_id(port->netdev);
dp_netdev_set_pmds_on_numa(dp, numa_id);
}
}
}
static char *
dpif_netdev_get_datapath_version(void)
{
return xstrdup("<built-in>");
}
static void
dp_netdev_flow_used(struct dp_netdev_flow *netdev_flow, int cnt, int size,
uint16_t tcp_flags, long long now)
{
uint16_t flags;
atomic_store_relaxed(&netdev_flow->stats.used, now);
non_atomic_ullong_add(&netdev_flow->stats.packet_count, cnt);
non_atomic_ullong_add(&netdev_flow->stats.byte_count, size);
atomic_read_relaxed(&netdev_flow->stats.tcp_flags, &flags);
flags |= tcp_flags;
atomic_store_relaxed(&netdev_flow->stats.tcp_flags, flags);
}
static void
dp_netdev_count_packet(struct dp_netdev_pmd_thread *pmd,
enum dp_stat_type type, int cnt)
{
non_atomic_ullong_add(&pmd->stats.n[type], cnt);
}
static int
dp_netdev_upcall(struct dp_netdev_pmd_thread *pmd, struct dp_packet *packet_,
struct flow *flow, struct flow_wildcards *wc, ovs_u128 *ufid,
enum dpif_upcall_type type, const struct nlattr *userdata,
struct ofpbuf *actions, struct ofpbuf *put_actions)
{
struct dp_netdev *dp = pmd->dp;
struct flow_tnl orig_tunnel;
int err;
if (OVS_UNLIKELY(!dp->upcall_cb)) {
return ENODEV;
}
/* Upcall processing expects the Geneve options to be in the translated
* format but we need to retain the raw format for datapath use. */
orig_tunnel.flags = flow->tunnel.flags;
if (flow->tunnel.flags & FLOW_TNL_F_UDPIF) {
orig_tunnel.metadata.present.len = flow->tunnel.metadata.present.len;
memcpy(orig_tunnel.metadata.opts.gnv, flow->tunnel.metadata.opts.gnv,
flow->tunnel.metadata.present.len);
err = tun_metadata_from_geneve_udpif(&orig_tunnel, &orig_tunnel,
&flow->tunnel);
if (err) {
return err;
}
}
if (OVS_UNLIKELY(!VLOG_DROP_DBG(&upcall_rl))) {
struct ds ds = DS_EMPTY_INITIALIZER;
char *packet_str;
struct ofpbuf key;
struct odp_flow_key_parms odp_parms = {
.flow = flow,
.mask = &wc->masks,
.odp_in_port = flow->in_port.odp_port,
.support = dp_netdev_support,
};
ofpbuf_init(&key, 0);
odp_flow_key_from_flow(&odp_parms, &key);
packet_str = ofp_packet_to_string(dp_packet_data(packet_),
dp_packet_size(packet_));
odp_flow_key_format(key.data, key.size, &ds);
VLOG_DBG("%s: %s upcall:\n%s\n%s", dp->name,
dpif_upcall_type_to_string(type), ds_cstr(&ds), packet_str);
ofpbuf_uninit(&key);
free(packet_str);
ds_destroy(&ds);
}
err = dp->upcall_cb(packet_, flow, ufid, pmd->core_id, type, userdata,
actions, wc, put_actions, dp->upcall_aux);
if (err && err != ENOSPC) {
return err;
}
/* Translate tunnel metadata masks to datapath format. */
if (wc) {
if (wc->masks.tunnel.metadata.present.map) {
struct geneve_opt opts[TLV_TOT_OPT_SIZE /
sizeof(struct geneve_opt)];
if (orig_tunnel.flags & FLOW_TNL_F_UDPIF) {
tun_metadata_to_geneve_udpif_mask(&flow->tunnel,
&wc->masks.tunnel,
orig_tunnel.metadata.opts.gnv,
orig_tunnel.metadata.present.len,
opts);
} else {
orig_tunnel.metadata.present.len = 0;
}
memset(&wc->masks.tunnel.metadata, 0,
sizeof wc->masks.tunnel.metadata);
memcpy(&wc->masks.tunnel.metadata.opts.gnv, opts,
orig_tunnel.metadata.present.len);
}
wc->masks.tunnel.metadata.present.len = 0xff;
}
/* Restore tunnel metadata. We need to use the saved options to ensure
* that any unknown options are not lost. The generated mask will have
* the same structure, matching on types and lengths but wildcarding
* option data we don't care about. */
if (orig_tunnel.flags & FLOW_TNL_F_UDPIF) {
memcpy(&flow->tunnel.metadata.opts.gnv, orig_tunnel.metadata.opts.gnv,
orig_tunnel.metadata.present.len);
flow->tunnel.metadata.present.len = orig_tunnel.metadata.present.len;
flow->tunnel.flags |= FLOW_TNL_F_UDPIF;
}
return err;
}
static inline uint32_t
dpif_netdev_packet_get_rss_hash(struct dp_packet *packet,
const struct miniflow *mf)
{
uint32_t hash, recirc_depth;
if (OVS_LIKELY(dp_packet_rss_valid(packet))) {
hash = dp_packet_get_rss_hash(packet);
} else {
hash = miniflow_hash_5tuple(mf, 0);
dp_packet_set_rss_hash(packet, hash);
}
/* The RSS hash must account for the recirculation depth to avoid
* collisions in the exact match cache */
recirc_depth = *recirc_depth_get_unsafe();
if (OVS_UNLIKELY(recirc_depth)) {
hash = hash_finish(hash, recirc_depth);
dp_packet_set_rss_hash(packet, hash);
}
return hash;
}
struct packet_batch {
unsigned int packet_count;
unsigned int byte_count;
uint16_t tcp_flags;
struct dp_netdev_flow *flow;
struct dp_packet *packets[NETDEV_MAX_BURST];
};
static inline void
packet_batch_update(struct packet_batch *batch, struct dp_packet *packet,
const struct miniflow *mf)
{
batch->tcp_flags |= miniflow_get_tcp_flags(mf);
batch->packets[batch->packet_count++] = packet;
batch->byte_count += dp_packet_size(packet);
}
static inline void
packet_batch_init(struct packet_batch *batch, struct dp_netdev_flow *flow)
{
flow->batch = batch;
batch->flow = flow;
batch->packet_count = 0;
batch->byte_count = 0;
batch->tcp_flags = 0;
}
static inline void
packet_batch_execute(struct packet_batch *batch,
struct dp_netdev_pmd_thread *pmd,
long long now)
{
struct dp_netdev_actions *actions;
struct dp_netdev_flow *flow = batch->flow;
dp_netdev_flow_used(flow, batch->packet_count, batch->byte_count,
batch->tcp_flags, now);
actions = dp_netdev_flow_get_actions(flow);
dp_netdev_execute_actions(pmd, batch->packets, batch->packet_count, true,
actions->actions, actions->size);
}
static inline void
dp_netdev_queue_batches(struct dp_packet *pkt,
struct dp_netdev_flow *flow, const struct miniflow *mf,
struct packet_batch *batches, size_t *n_batches)
{
struct packet_batch *batch = flow->batch;
if (OVS_UNLIKELY(!batch)) {
batch = &batches[(*n_batches)++];
packet_batch_init(batch, flow);
}
packet_batch_update(batch, pkt, mf);
}
/* Try to process all ('cnt') the 'packets' using only the exact match cache
* 'pmd->flow_cache'. If a flow is not found for a packet 'packets[i]', the
* miniflow is copied into 'keys' and the packet pointer is moved at the
* beginning of the 'packets' array.
*
* The function returns the number of packets that needs to be processed in the
* 'packets' array (they have been moved to the beginning of the vector).
*
* If 'md_is_valid' is false, the metadata in 'packets' is not valid and must be
* initialized by this function using 'port_no'.
*/
static inline size_t
emc_processing(struct dp_netdev_pmd_thread *pmd, struct dp_packet **packets,
size_t cnt, struct netdev_flow_key *keys,
struct packet_batch batches[], size_t *n_batches,
bool md_is_valid, odp_port_t port_no)
{
struct emc_cache *flow_cache = &pmd->flow_cache;
struct netdev_flow_key *key = &keys[0];
size_t i, n_missed = 0, n_dropped = 0;
for (i = 0; i < cnt; i++) {
struct dp_netdev_flow *flow;
struct dp_packet *packet = packets[i];
if (OVS_UNLIKELY(dp_packet_size(packet) < ETH_HEADER_LEN)) {
dp_packet_delete(packet);
n_dropped++;
continue;
}
if (i != cnt - 1) {
/* Prefetch next packet data and metadata. */
OVS_PREFETCH(dp_packet_data(packets[i+1]));
pkt_metadata_prefetch_init(&packets[i+1]->md);
}
if (!md_is_valid) {
pkt_metadata_init(&packet->md, port_no);
}
miniflow_extract(packet, &key->mf);
key->len = 0; /* Not computed yet. */
key->hash = dpif_netdev_packet_get_rss_hash(packet, &key->mf);
flow = emc_lookup(flow_cache, key);
if (OVS_LIKELY(flow)) {
dp_netdev_queue_batches(packet, flow, &key->mf, batches,
n_batches);
} else {
/* Exact match cache missed. Group missed packets together at
* the beginning of the 'packets' array. */
packets[n_missed] = packet;
/* 'key[n_missed]' contains the key of the current packet and it
* must be returned to the caller. The next key should be extracted
* to 'keys[n_missed + 1]'. */
key = &keys[++n_missed];
}
}
dp_netdev_count_packet(pmd, DP_STAT_EXACT_HIT, cnt - n_dropped - n_missed);
return n_missed;
}
static inline void
fast_path_processing(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **packets, size_t cnt,
struct netdev_flow_key *keys,
struct packet_batch batches[], size_t *n_batches)
{
#if !defined(__CHECKER__) && !defined(_WIN32)
const size_t PKT_ARRAY_SIZE = cnt;
#else
/* Sparse or MSVC doesn't like variable length array. */
enum { PKT_ARRAY_SIZE = NETDEV_MAX_BURST };
#endif
struct dpcls_rule *rules[PKT_ARRAY_SIZE];
struct dp_netdev *dp = pmd->dp;
struct emc_cache *flow_cache = &pmd->flow_cache;
int miss_cnt = 0, lost_cnt = 0;
bool any_miss;
size_t i;
for (i = 0; i < cnt; i++) {
/* Key length is needed in all the cases, hash computed on demand. */
keys[i].len = netdev_flow_key_size(miniflow_n_values(&keys[i].mf));
}
any_miss = !dpcls_lookup(&pmd->cls, keys, rules, cnt);
if (OVS_UNLIKELY(any_miss) && !fat_rwlock_tryrdlock(&dp->upcall_rwlock)) {
uint64_t actions_stub[512 / 8], slow_stub[512 / 8];
struct ofpbuf actions, put_actions;
ovs_u128 ufid;
ofpbuf_use_stub(&actions, actions_stub, sizeof actions_stub);
ofpbuf_use_stub(&put_actions, slow_stub, sizeof slow_stub);
for (i = 0; i < cnt; i++) {
struct dp_netdev_flow *netdev_flow;
struct ofpbuf *add_actions;
struct match match;
int error;
if (OVS_LIKELY(rules[i])) {
continue;
}
/* It's possible that an earlier slow path execution installed
* a rule covering this flow. In this case, it's a lot cheaper
* to catch it here than execute a miss. */
netdev_flow = dp_netdev_pmd_lookup_flow(pmd, &keys[i]);
if (netdev_flow) {
rules[i] = &netdev_flow->cr;
continue;
}
miss_cnt++;
match.tun_md.valid = false;
miniflow_expand(&keys[i].mf, &match.flow);
ofpbuf_clear(&actions);
ofpbuf_clear(&put_actions);
dpif_flow_hash(dp->dpif, &match.flow, sizeof match.flow, &ufid);
error = dp_netdev_upcall(pmd, packets[i], &match.flow, &match.wc,
&ufid, DPIF_UC_MISS, NULL, &actions,
&put_actions);
if (OVS_UNLIKELY(error && error != ENOSPC)) {
dp_packet_delete(packets[i]);
lost_cnt++;
continue;
}
/* The Netlink encoding of datapath flow keys cannot express
* wildcarding the presence of a VLAN tag. Instead, a missing VLAN
* tag is interpreted as exact match on the fact that there is no
* VLAN. Unless we refactor a lot of code that translates between
* Netlink and struct flow representations, we have to do the same
* here. */
if (!match.wc.masks.vlan_tci) {
match.wc.masks.vlan_tci = htons(0xffff);
}
/* We can't allow the packet batching in the next loop to execute
* the actions. Otherwise, if there are any slow path actions,
* we'll send the packet up twice. */
dp_netdev_execute_actions(pmd, &packets[i], 1, true,
actions.data, actions.size);
add_actions = put_actions.size ? &put_actions : &actions;
if (OVS_LIKELY(error != ENOSPC)) {
/* XXX: There's a race window where a flow covering this packet
* could have already been installed since we last did the flow
* lookup before upcall. This could be solved by moving the
* mutex lock outside the loop, but that's an awful long time
* to be locking everyone out of making flow installs. If we
* move to a per-core classifier, it would be reasonable. */
ovs_mutex_lock(&pmd->flow_mutex);
netdev_flow = dp_netdev_pmd_lookup_flow(pmd, &keys[i]);
if (OVS_LIKELY(!netdev_flow)) {
netdev_flow = dp_netdev_flow_add(pmd, &match, &ufid,
add_actions->data,
add_actions->size);
}
ovs_mutex_unlock(&pmd->flow_mutex);
emc_insert(flow_cache, &keys[i], netdev_flow);
}
}
ofpbuf_uninit(&actions);
ofpbuf_uninit(&put_actions);
fat_rwlock_unlock(&dp->upcall_rwlock);
dp_netdev_count_packet(pmd, DP_STAT_LOST, lost_cnt);
} else if (OVS_UNLIKELY(any_miss)) {
for (i = 0; i < cnt; i++) {
if (OVS_UNLIKELY(!rules[i])) {
dp_packet_delete(packets[i]);
lost_cnt++;
miss_cnt++;
}
}
}
for (i = 0; i < cnt; i++) {
struct dp_packet *packet = packets[i];
struct dp_netdev_flow *flow;
if (OVS_UNLIKELY(!rules[i])) {
continue;
}
flow = dp_netdev_flow_cast(rules[i]);
emc_insert(flow_cache, &keys[i], flow);
dp_netdev_queue_batches(packet, flow, &keys[i].mf, batches, n_batches);
}
dp_netdev_count_packet(pmd, DP_STAT_MASKED_HIT, cnt - miss_cnt);
dp_netdev_count_packet(pmd, DP_STAT_MISS, miss_cnt);
dp_netdev_count_packet(pmd, DP_STAT_LOST, lost_cnt);
}
/* Packets enter the datapath from a port (or from recirculation) here.
*
* For performance reasons a caller may choose not to initialize the metadata
* in 'packets': in this case 'mdinit' is false and this function needs to
* initialize it using 'port_no'. If the metadata in 'packets' is already
* valid, 'md_is_valid' must be true and 'port_no' will be ignored. */
static void
dp_netdev_input__(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **packets, int cnt,
bool md_is_valid, odp_port_t port_no)
{
#if !defined(__CHECKER__) && !defined(_WIN32)
const size_t PKT_ARRAY_SIZE = cnt;
#else
/* Sparse or MSVC doesn't like variable length array. */
enum { PKT_ARRAY_SIZE = NETDEV_MAX_BURST };
#endif
struct netdev_flow_key keys[PKT_ARRAY_SIZE];
struct packet_batch batches[PKT_ARRAY_SIZE];
long long now = time_msec();
size_t newcnt, n_batches, i;
n_batches = 0;
newcnt = emc_processing(pmd, packets, cnt, keys, batches, &n_batches,
md_is_valid, port_no);
if (OVS_UNLIKELY(newcnt)) {
fast_path_processing(pmd, packets, newcnt, keys, batches, &n_batches);
}
for (i = 0; i < n_batches; i++) {
batches[i].flow->batch = NULL;
}
for (i = 0; i < n_batches; i++) {
packet_batch_execute(&batches[i], pmd, now);
}
}
static void
dp_netdev_input(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **packets, int cnt,
odp_port_t port_no)
{
dp_netdev_input__(pmd, packets, cnt, false, port_no);
}
static void
dp_netdev_recirculate(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **packets, int cnt)
{
dp_netdev_input__(pmd, packets, cnt, true, 0);
}
struct dp_netdev_execute_aux {
struct dp_netdev_pmd_thread *pmd;
};
static void
dpif_netdev_register_dp_purge_cb(struct dpif *dpif, dp_purge_callback *cb,
void *aux)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp->dp_purge_aux = aux;
dp->dp_purge_cb = cb;
}
static void
dpif_netdev_register_upcall_cb(struct dpif *dpif, upcall_callback *cb,
void *aux)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
dp->upcall_aux = aux;
dp->upcall_cb = cb;
}
static void
dp_netdev_drop_packets(struct dp_packet **packets, int cnt, bool may_steal)
{
if (may_steal) {
int i;
for (i = 0; i < cnt; i++) {
dp_packet_delete(packets[i]);
}
}
}
static int
push_tnl_action(const struct dp_netdev *dp,
const struct nlattr *attr,
struct dp_packet **packets, int cnt)
{
struct dp_netdev_port *tun_port;
const struct ovs_action_push_tnl *data;
data = nl_attr_get(attr);
tun_port = dp_netdev_lookup_port(dp, u32_to_odp(data->tnl_port));
if (!tun_port) {
return -EINVAL;
}
netdev_push_header(tun_port->netdev, packets, cnt, data);
return 0;
}
static void
dp_netdev_clone_pkt_batch(struct dp_packet **dst_pkts,
struct dp_packet **src_pkts, int cnt)
{
int i;
for (i = 0; i < cnt; i++) {
dst_pkts[i] = dp_packet_clone(src_pkts[i]);
}
}
static void
dp_execute_cb(void *aux_, struct dp_packet **packets, int cnt,
const struct nlattr *a, bool may_steal)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
struct dp_netdev_execute_aux *aux = aux_;
uint32_t *depth = recirc_depth_get();
struct dp_netdev_pmd_thread *pmd = aux->pmd;
struct dp_netdev *dp = pmd->dp;
int type = nl_attr_type(a);
struct dp_netdev_port *p;
int i;
switch ((enum ovs_action_attr)type) {
case OVS_ACTION_ATTR_OUTPUT:
p = dp_netdev_lookup_port(dp, u32_to_odp(nl_attr_get_u32(a)));
if (OVS_LIKELY(p)) {
int tx_qid;
atomic_read_relaxed(&pmd->tx_qid, &tx_qid);
netdev_send(p->netdev, tx_qid, packets, cnt, may_steal);
return;
}
break;
case OVS_ACTION_ATTR_TUNNEL_PUSH:
if (*depth < MAX_RECIRC_DEPTH) {
struct dp_packet *tnl_pkt[NETDEV_MAX_BURST];
int err;
if (!may_steal) {
dp_netdev_clone_pkt_batch(tnl_pkt, packets, cnt);
packets = tnl_pkt;
}
err = push_tnl_action(dp, a, packets, cnt);
if (!err) {
(*depth)++;
dp_netdev_recirculate(pmd, packets, cnt);
(*depth)--;
} else {
dp_netdev_drop_packets(tnl_pkt, cnt, !may_steal);
}
return;
}
break;
case OVS_ACTION_ATTR_TUNNEL_POP:
if (*depth < MAX_RECIRC_DEPTH) {
odp_port_t portno = u32_to_odp(nl_attr_get_u32(a));
p = dp_netdev_lookup_port(dp, portno);
if (p) {
struct dp_packet *tnl_pkt[NETDEV_MAX_BURST];
int err;
if (!may_steal) {
dp_netdev_clone_pkt_batch(tnl_pkt, packets, cnt);
packets = tnl_pkt;
}
err = netdev_pop_header(p->netdev, packets, cnt);
if (!err) {
for (i = 0; i < cnt; i++) {
packets[i]->md.in_port.odp_port = portno;
}
(*depth)++;
dp_netdev_recirculate(pmd, packets, cnt);
(*depth)--;
} else {
dp_netdev_drop_packets(tnl_pkt, cnt, !may_steal);
}
return;
}
}
break;
case OVS_ACTION_ATTR_USERSPACE:
if (!fat_rwlock_tryrdlock(&dp->upcall_rwlock)) {
const struct nlattr *userdata;
struct ofpbuf actions;
struct flow flow;
ovs_u128 ufid;
userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA);
ofpbuf_init(&actions, 0);
for (i = 0; i < cnt; i++) {
int error;
ofpbuf_clear(&actions);
flow_extract(packets[i], &flow);
dpif_flow_hash(dp->dpif, &flow, sizeof flow, &ufid);
error = dp_netdev_upcall(pmd, packets[i], &flow, NULL, &ufid,
DPIF_UC_ACTION, userdata,&actions,
NULL);
if (!error || error == ENOSPC) {
dp_netdev_execute_actions(pmd, &packets[i], 1, may_steal,
actions.data, actions.size);
} else if (may_steal) {
dp_packet_delete(packets[i]);
}
}
ofpbuf_uninit(&actions);
fat_rwlock_unlock(&dp->upcall_rwlock);
return;
}
break;
case OVS_ACTION_ATTR_RECIRC:
if (*depth < MAX_RECIRC_DEPTH) {
struct dp_packet *recirc_pkts[NETDEV_MAX_BURST];
if (!may_steal) {
dp_netdev_clone_pkt_batch(recirc_pkts, packets, cnt);
packets = recirc_pkts;
}
for (i = 0; i < cnt; i++) {
packets[i]->md.recirc_id = nl_attr_get_u32(a);
}
(*depth)++;
dp_netdev_recirculate(pmd, packets, cnt);
(*depth)--;
return;
}
VLOG_WARN("Packet dropped. Max recirculation depth exceeded.");
break;
case OVS_ACTION_ATTR_CT:
/* If a flow with this action is slow-pathed, datapath assistance is
* required to implement it. However, we don't support this action
* in the userspace datapath. */
VLOG_WARN("Cannot execute conntrack action in userspace.");
break;
case OVS_ACTION_ATTR_PUSH_VLAN:
case OVS_ACTION_ATTR_POP_VLAN:
case OVS_ACTION_ATTR_PUSH_MPLS:
case OVS_ACTION_ATTR_POP_MPLS:
case OVS_ACTION_ATTR_SET:
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_SAMPLE:
case OVS_ACTION_ATTR_HASH:
case OVS_ACTION_ATTR_UNSPEC:
case __OVS_ACTION_ATTR_MAX:
OVS_NOT_REACHED();
}
dp_netdev_drop_packets(packets, cnt, may_steal);
}
static void
dp_netdev_execute_actions(struct dp_netdev_pmd_thread *pmd,
struct dp_packet **packets, int cnt,
bool may_steal,
const struct nlattr *actions, size_t actions_len)
{
struct dp_netdev_execute_aux aux = { pmd };
odp_execute_actions(&aux, packets, cnt, may_steal, actions,
actions_len, dp_execute_cb);
}
const struct dpif_class dpif_netdev_class = {
"netdev",
dpif_netdev_init,
dpif_netdev_enumerate,
dpif_netdev_port_open_type,
dpif_netdev_open,
dpif_netdev_close,
dpif_netdev_destroy,
dpif_netdev_run,
dpif_netdev_wait,
dpif_netdev_get_stats,
dpif_netdev_port_add,
dpif_netdev_port_del,
dpif_netdev_port_query_by_number,
dpif_netdev_port_query_by_name,
NULL, /* port_get_pid */
dpif_netdev_port_dump_start,
dpif_netdev_port_dump_next,
dpif_netdev_port_dump_done,
dpif_netdev_port_poll,
dpif_netdev_port_poll_wait,
dpif_netdev_flow_flush,
dpif_netdev_flow_dump_create,
dpif_netdev_flow_dump_destroy,
dpif_netdev_flow_dump_thread_create,
dpif_netdev_flow_dump_thread_destroy,
dpif_netdev_flow_dump_next,
dpif_netdev_operate,
NULL, /* recv_set */
NULL, /* handlers_set */
dpif_netdev_pmd_set,
dpif_netdev_queue_to_priority,
NULL, /* recv */
NULL, /* recv_wait */
NULL, /* recv_purge */
dpif_netdev_register_dp_purge_cb,
dpif_netdev_register_upcall_cb,
dpif_netdev_enable_upcall,
dpif_netdev_disable_upcall,
dpif_netdev_get_datapath_version,
NULL, /* ct_dump_start */
NULL, /* ct_dump_next */
NULL, /* ct_dump_done */
NULL, /* ct_flush */
};
static void
dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[], void *aux OVS_UNUSED)
{
struct dp_netdev_port *old_port;
struct dp_netdev_port *new_port;
struct dp_netdev *dp;
odp_port_t port_no;
ovs_mutex_lock(&dp_netdev_mutex);
dp = shash_find_data(&dp_netdevs, argv[1]);
if (!dp || !dpif_netdev_class_is_dummy(dp->class)) {
ovs_mutex_unlock(&dp_netdev_mutex);
unixctl_command_reply_error(conn, "unknown datapath or not a dummy");
return;
}
ovs_refcount_ref(&dp->ref_cnt);
ovs_mutex_unlock(&dp_netdev_mutex);
ovs_mutex_lock(&dp->port_mutex);
if (get_port_by_name(dp, argv[2], &old_port)) {
unixctl_command_reply_error(conn, "unknown port");
goto exit;
}
port_no = u32_to_odp(atoi(argv[3]));
if (!port_no || port_no == ODPP_NONE) {
unixctl_command_reply_error(conn, "bad port number");
goto exit;
}
if (dp_netdev_lookup_port(dp, port_no)) {
unixctl_command_reply_error(conn, "port number already in use");
goto exit;
}
/* Remove old port. */
cmap_remove(&dp->ports, &old_port->node, hash_port_no(old_port->port_no));
ovsrcu_postpone(free, old_port);
/* Insert new port (cmap semantics mean we cannot re-insert 'old_port'). */
new_port = xmemdup(old_port, sizeof *old_port);
new_port->port_no = port_no;
cmap_insert(&dp->ports, &new_port->node, hash_port_no(port_no));
seq_change(dp->port_seq);
unixctl_command_reply(conn, NULL);
exit:
ovs_mutex_unlock(&dp->port_mutex);
dp_netdev_unref(dp);
}
static void
dpif_dummy_delete_port(struct unixctl_conn *conn, int argc OVS_UNUSED,
const char *argv[], void *aux OVS_UNUSED)
{
struct dp_netdev_port *port;
struct dp_netdev *dp;
ovs_mutex_lock(&dp_netdev_mutex);
dp = shash_find_data(&dp_netdevs, argv[1]);
if (!dp || !dpif_netdev_class_is_dummy(dp->class)) {
ovs_mutex_unlock(&dp_netdev_mutex);
unixctl_command_reply_error(conn, "unknown datapath or not a dummy");
return;
}
ovs_refcount_ref(&dp->ref_cnt);
ovs_mutex_unlock(&dp_netdev_mutex);
ovs_mutex_lock(&dp->port_mutex);
if (get_port_by_name(dp, argv[2], &port)) {
unixctl_command_reply_error(conn, "unknown port");
} else if (port->port_no == ODPP_LOCAL) {
unixctl_command_reply_error(conn, "can't delete local port");
} else {
do_del_port(dp, port);
unixctl_command_reply(conn, NULL);
}
ovs_mutex_unlock(&dp->port_mutex);
dp_netdev_unref(dp);
}
static void
dpif_dummy_register__(const char *type)
{
struct dpif_class *class;
class = xmalloc(sizeof *class);
*class = dpif_netdev_class;
class->type = xstrdup(type);
dp_register_provider(class);
}
static void
dpif_dummy_override(const char *type)
{
int error;
/*
* Ignore EAFNOSUPPORT to allow --enable-dummy=system with
* a userland-only build. It's useful for testsuite.
*/
error = dp_unregister_provider(type);
if (error == 0 || error == EAFNOSUPPORT) {
dpif_dummy_register__(type);
}
}
void
dpif_dummy_register(enum dummy_level level)
{
if (level == DUMMY_OVERRIDE_ALL) {
struct sset types;
const char *type;
sset_init(&types);
dp_enumerate_types(&types);
SSET_FOR_EACH (type, &types) {
dpif_dummy_override(type);
}
sset_destroy(&types);
} else if (level == DUMMY_OVERRIDE_SYSTEM) {
dpif_dummy_override("system");
}
dpif_dummy_register__("dummy");
unixctl_command_register("dpif-dummy/change-port-number",
"dp port new-number",
3, 3, dpif_dummy_change_port_number, NULL);
unixctl_command_register("dpif-dummy/delete-port", "dp port",
2, 2, dpif_dummy_delete_port, NULL);
}
/* Datapath Classifier. */
/* A set of rules that all have the same fields wildcarded. */
struct dpcls_subtable {
/* The fields are only used by writers. */
struct cmap_node cmap_node OVS_GUARDED; /* Within dpcls 'subtables_map'. */
/* These fields are accessed by readers. */
struct cmap rules; /* Contains "struct dpcls_rule"s. */
struct netdev_flow_key mask; /* Wildcards for fields (const). */
/* 'mask' must be the last field, additional space is allocated here. */
};
/* Initializes 'cls' as a classifier that initially contains no classification
* rules. */
static void
dpcls_init(struct dpcls *cls)
{
cmap_init(&cls->subtables_map);
pvector_init(&cls->subtables);
}
static void
dpcls_destroy_subtable(struct dpcls *cls, struct dpcls_subtable *subtable)
{
pvector_remove(&cls->subtables, subtable);
cmap_remove(&cls->subtables_map, &subtable->cmap_node,
subtable->mask.hash);
cmap_destroy(&subtable->rules);
ovsrcu_postpone(free, subtable);
}
/* Destroys 'cls'. Rules within 'cls', if any, are not freed; this is the
* caller's responsibility.
* May only be called after all the readers have been terminated. */
static void
dpcls_destroy(struct dpcls *cls)
{
if (cls) {
struct dpcls_subtable *subtable;
CMAP_FOR_EACH (subtable, cmap_node, &cls->subtables_map) {
ovs_assert(cmap_count(&subtable->rules) == 0);
dpcls_destroy_subtable(cls, subtable);
}
cmap_destroy(&cls->subtables_map);
pvector_destroy(&cls->subtables);
}
}
static struct dpcls_subtable *
dpcls_create_subtable(struct dpcls *cls, const struct netdev_flow_key *mask)
{
struct dpcls_subtable *subtable;
/* Need to add one. */
subtable = xmalloc(sizeof *subtable
- sizeof subtable->mask.mf + mask->len);
cmap_init(&subtable->rules);
netdev_flow_key_clone(&subtable->mask, mask);
cmap_insert(&cls->subtables_map, &subtable->cmap_node, mask->hash);
pvector_insert(&cls->subtables, subtable, 0);
pvector_publish(&cls->subtables);
return subtable;
}
static inline struct dpcls_subtable *
dpcls_find_subtable(struct dpcls *cls, const struct netdev_flow_key *mask)
{
struct dpcls_subtable *subtable;
CMAP_FOR_EACH_WITH_HASH (subtable, cmap_node, mask->hash,
&cls->subtables_map) {
if (netdev_flow_key_equal(&subtable->mask, mask)) {
return subtable;
}
}
return dpcls_create_subtable(cls, mask);
}
/* Insert 'rule' into 'cls'. */
static void
dpcls_insert(struct dpcls *cls, struct dpcls_rule *rule,
const struct netdev_flow_key *mask)
{
struct dpcls_subtable *subtable = dpcls_find_subtable(cls, mask);
rule->mask = &subtable->mask;
cmap_insert(&subtable->rules, &rule->cmap_node, rule->flow.hash);
}
/* Removes 'rule' from 'cls', also destructing the 'rule'. */
static void
dpcls_remove(struct dpcls *cls, struct dpcls_rule *rule)
{
struct dpcls_subtable *subtable;
ovs_assert(rule->mask);
INIT_CONTAINER(subtable, rule->mask, mask);
if (cmap_remove(&subtable->rules, &rule->cmap_node, rule->flow.hash)
== 0) {
dpcls_destroy_subtable(cls, subtable);
pvector_publish(&cls->subtables);
}
}
/* Returns true if 'target' satisfies 'key' in 'mask', that is, if each 1-bit
* in 'mask' the values in 'key' and 'target' are the same. */
static inline bool
dpcls_rule_matches_key(const struct dpcls_rule *rule,
const struct netdev_flow_key *target)
{
const uint64_t *keyp = miniflow_get_values(&rule->flow.mf);
const uint64_t *maskp = miniflow_get_values(&rule->mask->mf);
uint64_t value;
NETDEV_FLOW_KEY_FOR_EACH_IN_FLOWMAP(value, target, rule->flow.mf.map) {
if (OVS_UNLIKELY((value & *maskp++) != *keyp++)) {
return false;
}
}
return true;
}
/* For each miniflow in 'flows' performs a classifier lookup writing the result
* into the corresponding slot in 'rules'. If a particular entry in 'flows' is
* NULL it is skipped.
*
* This function is optimized for use in the userspace datapath and therefore
* does not implement a lot of features available in the standard
* classifier_lookup() function. Specifically, it does not implement
* priorities, instead returning any rule which matches the flow.
*
* Returns true if all flows found a corresponding rule. */
static bool
dpcls_lookup(const struct dpcls *cls, const struct netdev_flow_key keys[],
struct dpcls_rule **rules, const size_t cnt)
{
/* The batch size 16 was experimentally found faster than 8 or 32. */
typedef uint16_t map_type;
#define MAP_BITS (sizeof(map_type) * CHAR_BIT)
#if !defined(__CHECKER__) && !defined(_WIN32)
const int N_MAPS = DIV_ROUND_UP(cnt, MAP_BITS);
#else
enum { N_MAPS = DIV_ROUND_UP(NETDEV_MAX_BURST, MAP_BITS) };
#endif
map_type maps[N_MAPS];
struct dpcls_subtable *subtable;
memset(maps, 0xff, sizeof maps);
if (cnt % MAP_BITS) {
maps[N_MAPS - 1] >>= MAP_BITS - cnt % MAP_BITS; /* Clear extra bits. */
}
memset(rules, 0, cnt * sizeof *rules);
PVECTOR_FOR_EACH (subtable, &cls->subtables) {
const struct netdev_flow_key *mkeys = keys;
struct dpcls_rule **mrules = rules;
map_type remains = 0;
int m;
BUILD_ASSERT_DECL(sizeof remains == sizeof *maps);
for (m = 0; m < N_MAPS; m++, mkeys += MAP_BITS, mrules += MAP_BITS) {
uint32_t hashes[MAP_BITS];
const struct cmap_node *nodes[MAP_BITS];
unsigned long map = maps[m];
int i;
if (!map) {
continue; /* Skip empty maps. */
}
/* Compute hashes for the remaining keys. */
ULLONG_FOR_EACH_1(i, map) {
hashes[i] = netdev_flow_key_hash_in_mask(&mkeys[i],
&subtable->mask);
}
/* Lookup. */
map = cmap_find_batch(&subtable->rules, map, hashes, nodes);
/* Check results. */
ULLONG_FOR_EACH_1(i, map) {
struct dpcls_rule *rule;
CMAP_NODE_FOR_EACH (rule, cmap_node, nodes[i]) {
if (OVS_LIKELY(dpcls_rule_matches_key(rule, &mkeys[i]))) {
mrules[i] = rule;
goto next;
}
}
ULLONG_SET0(map, i); /* Did not match. */
next:
; /* Keep Sparse happy. */
}
maps[m] &= ~map; /* Clear the found rules. */
remains |= maps[m];
}
if (!remains) {
return true; /* All found. */
}
}
return false; /* Some misses. */
}
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