mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Tonghao Zhang](/assets/img/avatar_default.png)
When calling the flow_free() to free the flow, we call many times (cpu_possible_mask, eg. 128 as default) cpumask_next(). That will take up our CPU usage if we call the flow_free() frequently. When we put all packets to userspace via upcall, and OvS will send them back via netlink to ovs_packet_cmd_execute(will call flow_free). The test topo is shown as below. VM01 sends TCP packets to VM02, and OvS forward packtets. When testing, we use perf to report the system performance. VM01 --- OvS-VM --- VM02 Without this patch, perf-top show as below: The flow_free() is 3.02% CPU usage. 4.23% [kernel] [k] _raw_spin_unlock_irqrestore 3.62% [kernel] [k] __do_softirq 3.16% [kernel] [k] __memcpy 3.02% [kernel] [k] flow_free 2.42% libc-2.17.so [.] __memcpy_ssse3_back 2.18% [kernel] [k] copy_user_generic_unrolled 2.17% [kernel] [k] find_next_bit When applied this patch, perf-top show as below: Not shown on the list anymore. 4.11% [kernel] [k] _raw_spin_unlock_irqrestore 3.79% [kernel] [k] __do_softirq 3.46% [kernel] [k] __memcpy 2.73% libc-2.17.so [.] __memcpy_ssse3_back 2.25% [kernel] [k] copy_user_generic_unrolled 1.89% libc-2.17.so [.] _int_malloc 1.53% ovs-vswitchd [.] xlate_actions With this patch, the TCP throughput(we dont use Megaflow Cache + Microflow Cache) between VMs is 1.18Gbs/sec up to 1.30Gbs/sec (maybe ~10% performance imporve). This patch adds cpumask struct, the cpu_used_mask stores the cpu_id that the flow used. And we only check the flow_stats on the cpu we used, and it is unncessary to check all possible cpu when getting, cleaning, and updating the flow_stats. Adding the cpu_used_mask to sw_flow struct does’t increase the cacheline number. Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
777 lines
19 KiB
C
777 lines
19 KiB
C
/*
|
|
* Copyright (c) 2007-2014 Nicira, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301, USA
|
|
*/
|
|
|
|
#include "flow.h"
|
|
#include "datapath.h"
|
|
#include "flow_netlink.h"
|
|
#include <linux/uaccess.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <net/llc_pdu.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/jhash.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/llc.h>
|
|
#include <linux/module.h>
|
|
#include <linux/in.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/sctp.h>
|
|
#include <linux/tcp.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/icmp.h>
|
|
#include <linux/icmpv6.h>
|
|
#include <linux/rculist.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ndisc.h>
|
|
|
|
#define TBL_MIN_BUCKETS 1024
|
|
#define REHASH_INTERVAL (10 * 60 * HZ)
|
|
|
|
static struct kmem_cache *flow_cache;
|
|
struct kmem_cache *flow_stats_cache __read_mostly;
|
|
|
|
static u16 range_n_bytes(const struct sw_flow_key_range *range)
|
|
{
|
|
return range->end - range->start;
|
|
}
|
|
|
|
void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
|
|
bool full, const struct sw_flow_mask *mask)
|
|
{
|
|
int start = full ? 0 : mask->range.start;
|
|
int len = full ? sizeof *dst : range_n_bytes(&mask->range);
|
|
const long *m = (const long *)((const u8 *)&mask->key + start);
|
|
const long *s = (const long *)((const u8 *)src + start);
|
|
long *d = (long *)((u8 *)dst + start);
|
|
int i;
|
|
|
|
/* If 'full' is true then all of 'dst' is fully initialized. Otherwise,
|
|
* if 'full' is false the memory outside of the 'mask->range' is left
|
|
* uninitialized. This can be used as an optimization when further
|
|
* operations on 'dst' only use contents within 'mask->range'.
|
|
*/
|
|
for (i = 0; i < len; i += sizeof(long))
|
|
*d++ = *s++ & *m++;
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_alloc(void)
|
|
{
|
|
struct sw_flow *flow;
|
|
struct flow_stats *stats;
|
|
|
|
flow = kmem_cache_zalloc(flow_cache, GFP_KERNEL);
|
|
if (!flow)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
flow->stats_last_writer = -1;
|
|
|
|
/* Initialize the default stat node. */
|
|
stats = kmem_cache_alloc_node(flow_stats_cache,
|
|
GFP_KERNEL | __GFP_ZERO,
|
|
node_online(0) ? 0 : NUMA_NO_NODE);
|
|
if (!stats)
|
|
goto err;
|
|
|
|
spin_lock_init(&stats->lock);
|
|
|
|
RCU_INIT_POINTER(flow->stats[0], stats);
|
|
|
|
cpumask_set_cpu(0, &flow->cpu_used_mask);
|
|
|
|
return flow;
|
|
err:
|
|
kmem_cache_free(flow_cache, flow);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
int ovs_flow_tbl_count(const struct flow_table *table)
|
|
{
|
|
return table->count;
|
|
}
|
|
|
|
static struct flex_array *alloc_buckets(unsigned int n_buckets)
|
|
{
|
|
struct flex_array *buckets;
|
|
int i, err;
|
|
|
|
buckets = flex_array_alloc(sizeof(struct hlist_head),
|
|
n_buckets, GFP_KERNEL);
|
|
if (!buckets)
|
|
return NULL;
|
|
|
|
err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
|
|
if (err) {
|
|
flex_array_free(buckets);
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; i < n_buckets; i++)
|
|
INIT_HLIST_HEAD((struct hlist_head *)
|
|
flex_array_get(buckets, i));
|
|
|
|
return buckets;
|
|
}
|
|
|
|
static void flow_free(struct sw_flow *flow)
|
|
{
|
|
int cpu;
|
|
|
|
if (ovs_identifier_is_key(&flow->id))
|
|
kfree(flow->id.unmasked_key);
|
|
if (flow->sf_acts)
|
|
ovs_nla_free_flow_actions((struct sw_flow_actions __force *)flow->sf_acts);
|
|
/* We open code this to make sure cpu 0 is always considered */
|
|
for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask))
|
|
if (flow->stats[cpu])
|
|
kmem_cache_free(flow_stats_cache,
|
|
(struct flow_stats __force *)flow->stats[cpu]);
|
|
kmem_cache_free(flow_cache, flow);
|
|
}
|
|
|
|
static void rcu_free_flow_callback(struct rcu_head *rcu)
|
|
{
|
|
struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
|
|
|
|
flow_free(flow);
|
|
}
|
|
|
|
void ovs_flow_free(struct sw_flow *flow, bool deferred)
|
|
{
|
|
if (!flow)
|
|
return;
|
|
|
|
if (deferred)
|
|
call_rcu(&flow->rcu, rcu_free_flow_callback);
|
|
else
|
|
flow_free(flow);
|
|
}
|
|
|
|
static void free_buckets(struct flex_array *buckets)
|
|
{
|
|
flex_array_free(buckets);
|
|
}
|
|
|
|
|
|
static void __table_instance_destroy(struct table_instance *ti)
|
|
{
|
|
free_buckets(ti->buckets);
|
|
kfree(ti);
|
|
}
|
|
|
|
static struct table_instance *table_instance_alloc(int new_size)
|
|
{
|
|
struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL);
|
|
|
|
if (!ti)
|
|
return NULL;
|
|
|
|
ti->buckets = alloc_buckets(new_size);
|
|
|
|
if (!ti->buckets) {
|
|
kfree(ti);
|
|
return NULL;
|
|
}
|
|
ti->n_buckets = new_size;
|
|
ti->node_ver = 0;
|
|
ti->keep_flows = false;
|
|
get_random_bytes(&ti->hash_seed, sizeof(u32));
|
|
|
|
return ti;
|
|
}
|
|
|
|
int ovs_flow_tbl_init(struct flow_table *table)
|
|
{
|
|
struct table_instance *ti, *ufid_ti;
|
|
|
|
ti = table_instance_alloc(TBL_MIN_BUCKETS);
|
|
|
|
if (!ti)
|
|
return -ENOMEM;
|
|
|
|
ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
|
|
if (!ufid_ti)
|
|
goto free_ti;
|
|
|
|
rcu_assign_pointer(table->ti, ti);
|
|
rcu_assign_pointer(table->ufid_ti, ufid_ti);
|
|
INIT_LIST_HEAD(&table->mask_list);
|
|
table->last_rehash = jiffies;
|
|
table->count = 0;
|
|
table->ufid_count = 0;
|
|
return 0;
|
|
|
|
free_ti:
|
|
__table_instance_destroy(ti);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
|
|
{
|
|
struct table_instance *ti = container_of(rcu, struct table_instance, rcu);
|
|
|
|
__table_instance_destroy(ti);
|
|
}
|
|
|
|
static void table_instance_destroy(struct table_instance *ti,
|
|
struct table_instance *ufid_ti,
|
|
bool deferred)
|
|
{
|
|
int i;
|
|
|
|
if (!ti)
|
|
return;
|
|
|
|
BUG_ON(!ufid_ti);
|
|
if (ti->keep_flows)
|
|
goto skip_flows;
|
|
|
|
for (i = 0; i < ti->n_buckets; i++) {
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head = flex_array_get(ti->buckets, i);
|
|
struct hlist_node *n;
|
|
int ver = ti->node_ver;
|
|
int ufid_ver = ufid_ti->node_ver;
|
|
|
|
hlist_for_each_entry_safe(flow, n, head, flow_table.node[ver]) {
|
|
hlist_del_rcu(&flow->flow_table.node[ver]);
|
|
if (ovs_identifier_is_ufid(&flow->id))
|
|
hlist_del_rcu(&flow->ufid_table.node[ufid_ver]);
|
|
ovs_flow_free(flow, deferred);
|
|
}
|
|
}
|
|
|
|
skip_flows:
|
|
if (deferred) {
|
|
call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
|
|
call_rcu(&ufid_ti->rcu, flow_tbl_destroy_rcu_cb);
|
|
} else {
|
|
__table_instance_destroy(ti);
|
|
__table_instance_destroy(ufid_ti);
|
|
}
|
|
}
|
|
|
|
/* No need for locking this function is called from RCU callback or
|
|
* error path.
|
|
*/
|
|
void ovs_flow_tbl_destroy(struct flow_table *table)
|
|
{
|
|
struct table_instance *ti = rcu_dereference_raw(table->ti);
|
|
struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
|
|
|
|
table_instance_destroy(ti, ufid_ti, false);
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
|
|
u32 *bucket, u32 *last)
|
|
{
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
int ver;
|
|
int i;
|
|
|
|
ver = ti->node_ver;
|
|
while (*bucket < ti->n_buckets) {
|
|
i = 0;
|
|
head = flex_array_get(ti->buckets, *bucket);
|
|
hlist_for_each_entry_rcu(flow, head, flow_table.node[ver]) {
|
|
if (i < *last) {
|
|
i++;
|
|
continue;
|
|
}
|
|
*last = i + 1;
|
|
return flow;
|
|
}
|
|
(*bucket)++;
|
|
*last = 0;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash)
|
|
{
|
|
hash = jhash_1word(hash, ti->hash_seed);
|
|
return flex_array_get(ti->buckets,
|
|
(hash & (ti->n_buckets - 1)));
|
|
}
|
|
|
|
static void table_instance_insert(struct table_instance *ti,
|
|
struct sw_flow *flow)
|
|
{
|
|
struct hlist_head *head;
|
|
|
|
head = find_bucket(ti, flow->flow_table.hash);
|
|
hlist_add_head_rcu(&flow->flow_table.node[ti->node_ver], head);
|
|
}
|
|
|
|
static void ufid_table_instance_insert(struct table_instance *ti,
|
|
struct sw_flow *flow)
|
|
{
|
|
struct hlist_head *head;
|
|
|
|
head = find_bucket(ti, flow->ufid_table.hash);
|
|
hlist_add_head_rcu(&flow->ufid_table.node[ti->node_ver], head);
|
|
}
|
|
|
|
static void flow_table_copy_flows(struct table_instance *old,
|
|
struct table_instance *new, bool ufid)
|
|
{
|
|
int old_ver;
|
|
int i;
|
|
|
|
old_ver = old->node_ver;
|
|
new->node_ver = !old_ver;
|
|
|
|
/* Insert in new table. */
|
|
for (i = 0; i < old->n_buckets; i++) {
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
|
|
head = flex_array_get(old->buckets, i);
|
|
|
|
if (ufid)
|
|
hlist_for_each_entry(flow, head,
|
|
ufid_table.node[old_ver])
|
|
ufid_table_instance_insert(new, flow);
|
|
else
|
|
hlist_for_each_entry(flow, head,
|
|
flow_table.node[old_ver])
|
|
table_instance_insert(new, flow);
|
|
}
|
|
|
|
old->keep_flows = true;
|
|
}
|
|
|
|
static struct table_instance *table_instance_rehash(struct table_instance *ti,
|
|
int n_buckets, bool ufid)
|
|
{
|
|
struct table_instance *new_ti;
|
|
|
|
new_ti = table_instance_alloc(n_buckets);
|
|
if (!new_ti)
|
|
return NULL;
|
|
|
|
flow_table_copy_flows(ti, new_ti, ufid);
|
|
|
|
return new_ti;
|
|
}
|
|
|
|
int ovs_flow_tbl_flush(struct flow_table *flow_table)
|
|
{
|
|
struct table_instance *old_ti, *new_ti;
|
|
struct table_instance *old_ufid_ti, *new_ufid_ti;
|
|
|
|
new_ti = table_instance_alloc(TBL_MIN_BUCKETS);
|
|
if (!new_ti)
|
|
return -ENOMEM;
|
|
new_ufid_ti = table_instance_alloc(TBL_MIN_BUCKETS);
|
|
if (!new_ufid_ti)
|
|
goto err_free_ti;
|
|
|
|
old_ti = ovsl_dereference(flow_table->ti);
|
|
old_ufid_ti = ovsl_dereference(flow_table->ufid_ti);
|
|
|
|
rcu_assign_pointer(flow_table->ti, new_ti);
|
|
rcu_assign_pointer(flow_table->ufid_ti, new_ufid_ti);
|
|
flow_table->last_rehash = jiffies;
|
|
flow_table->count = 0;
|
|
flow_table->ufid_count = 0;
|
|
|
|
table_instance_destroy(old_ti, old_ufid_ti, true);
|
|
return 0;
|
|
|
|
err_free_ti:
|
|
__table_instance_destroy(new_ti);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static u32 flow_hash(const struct sw_flow_key *key,
|
|
const struct sw_flow_key_range *range)
|
|
{
|
|
int key_start = range->start;
|
|
int key_end = range->end;
|
|
const u32 *hash_key = (const u32 *)((const u8 *)key + key_start);
|
|
int hash_u32s = (key_end - key_start) >> 2;
|
|
|
|
/* Make sure number of hash bytes are multiple of u32. */
|
|
BUILD_BUG_ON(sizeof(long) % sizeof(u32));
|
|
|
|
return jhash2(hash_key, hash_u32s, 0);
|
|
}
|
|
|
|
static int flow_key_start(const struct sw_flow_key *key)
|
|
{
|
|
if (key->tun_proto)
|
|
return 0;
|
|
else
|
|
return rounddown(offsetof(struct sw_flow_key, phy),
|
|
sizeof(long));
|
|
}
|
|
|
|
static bool cmp_key(const struct sw_flow_key *key1,
|
|
const struct sw_flow_key *key2,
|
|
int key_start, int key_end)
|
|
{
|
|
const long *cp1 = (const long *)((const u8 *)key1 + key_start);
|
|
const long *cp2 = (const long *)((const u8 *)key2 + key_start);
|
|
long diffs = 0;
|
|
int i;
|
|
|
|
for (i = key_start; i < key_end; i += sizeof(long))
|
|
diffs |= *cp1++ ^ *cp2++;
|
|
|
|
return diffs == 0;
|
|
}
|
|
|
|
static bool flow_cmp_masked_key(const struct sw_flow *flow,
|
|
const struct sw_flow_key *key,
|
|
const struct sw_flow_key_range *range)
|
|
{
|
|
return cmp_key(&flow->key, key, range->start, range->end);
|
|
}
|
|
|
|
static bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
|
|
const struct sw_flow_match *match)
|
|
{
|
|
struct sw_flow_key *key = match->key;
|
|
int key_start = flow_key_start(key);
|
|
int key_end = match->range.end;
|
|
|
|
BUG_ON(ovs_identifier_is_ufid(&flow->id));
|
|
return cmp_key(flow->id.unmasked_key, key, key_start, key_end);
|
|
}
|
|
|
|
static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
|
|
const struct sw_flow_key *unmasked,
|
|
const struct sw_flow_mask *mask)
|
|
{
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
u32 hash;
|
|
struct sw_flow_key masked_key;
|
|
|
|
ovs_flow_mask_key(&masked_key, unmasked, false, mask);
|
|
hash = flow_hash(&masked_key, &mask->range);
|
|
head = find_bucket(ti, hash);
|
|
hlist_for_each_entry_rcu(flow, head, flow_table.node[ti->node_ver]) {
|
|
if (flow->mask == mask && flow->flow_table.hash == hash &&
|
|
flow_cmp_masked_key(flow, &masked_key, &mask->range))
|
|
return flow;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
|
|
const struct sw_flow_key *key,
|
|
u32 *n_mask_hit)
|
|
{
|
|
struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
|
|
struct sw_flow_mask *mask;
|
|
struct sw_flow *flow;
|
|
|
|
*n_mask_hit = 0;
|
|
list_for_each_entry_rcu(mask, &tbl->mask_list, list) {
|
|
(*n_mask_hit)++;
|
|
flow = masked_flow_lookup(ti, key, mask);
|
|
if (flow) /* Found */
|
|
return flow;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
|
|
const struct sw_flow_key *key)
|
|
{
|
|
u32 __always_unused n_mask_hit;
|
|
|
|
return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit);
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
|
|
const struct sw_flow_match *match)
|
|
{
|
|
struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
|
|
struct sw_flow_mask *mask;
|
|
struct sw_flow *flow;
|
|
|
|
/* Always called under ovs-mutex. */
|
|
list_for_each_entry(mask, &tbl->mask_list, list) {
|
|
flow = masked_flow_lookup(ti, match->key, mask);
|
|
if (flow && ovs_identifier_is_key(&flow->id) &&
|
|
ovs_flow_cmp_unmasked_key(flow, match))
|
|
return flow;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static u32 ufid_hash(const struct sw_flow_id *sfid)
|
|
{
|
|
return jhash(sfid->ufid, sfid->ufid_len, 0);
|
|
}
|
|
|
|
static bool ovs_flow_cmp_ufid(const struct sw_flow *flow,
|
|
const struct sw_flow_id *sfid)
|
|
{
|
|
if (flow->id.ufid_len != sfid->ufid_len)
|
|
return false;
|
|
|
|
return !memcmp(flow->id.ufid, sfid->ufid, sfid->ufid_len);
|
|
}
|
|
|
|
bool ovs_flow_cmp(const struct sw_flow *flow, const struct sw_flow_match *match)
|
|
{
|
|
if (ovs_identifier_is_ufid(&flow->id))
|
|
return flow_cmp_masked_key(flow, match->key, &match->range);
|
|
|
|
return ovs_flow_cmp_unmasked_key(flow, match);
|
|
}
|
|
|
|
struct sw_flow *ovs_flow_tbl_lookup_ufid(struct flow_table *tbl,
|
|
const struct sw_flow_id *ufid)
|
|
{
|
|
struct table_instance *ti = rcu_dereference_ovsl(tbl->ufid_ti);
|
|
struct sw_flow *flow;
|
|
struct hlist_head *head;
|
|
u32 hash;
|
|
|
|
hash = ufid_hash(ufid);
|
|
head = find_bucket(ti, hash);
|
|
hlist_for_each_entry_rcu(flow, head, ufid_table.node[ti->node_ver]) {
|
|
if (flow->ufid_table.hash == hash &&
|
|
ovs_flow_cmp_ufid(flow, ufid))
|
|
return flow;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int ovs_flow_tbl_num_masks(const struct flow_table *table)
|
|
{
|
|
struct sw_flow_mask *mask;
|
|
int num = 0;
|
|
|
|
list_for_each_entry(mask, &table->mask_list, list)
|
|
num++;
|
|
|
|
return num;
|
|
}
|
|
|
|
static struct table_instance *table_instance_expand(struct table_instance *ti,
|
|
bool ufid)
|
|
{
|
|
return table_instance_rehash(ti, ti->n_buckets * 2, ufid);
|
|
}
|
|
|
|
/* Remove 'mask' from the mask list, if it is not needed any more. */
|
|
static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
|
|
{
|
|
if (mask) {
|
|
/* ovs-lock is required to protect mask-refcount and
|
|
* mask list.
|
|
*/
|
|
ASSERT_OVSL();
|
|
BUG_ON(!mask->ref_count);
|
|
mask->ref_count--;
|
|
|
|
if (!mask->ref_count) {
|
|
list_del_rcu(&mask->list);
|
|
kfree_rcu(mask, rcu);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Must be called with OVS mutex held. */
|
|
void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
struct table_instance *ti = ovsl_dereference(table->ti);
|
|
struct table_instance *ufid_ti = ovsl_dereference(table->ufid_ti);
|
|
|
|
BUG_ON(table->count == 0);
|
|
hlist_del_rcu(&flow->flow_table.node[ti->node_ver]);
|
|
table->count--;
|
|
if (ovs_identifier_is_ufid(&flow->id)) {
|
|
hlist_del_rcu(&flow->ufid_table.node[ufid_ti->node_ver]);
|
|
table->ufid_count--;
|
|
}
|
|
|
|
/* RCU delete the mask. 'flow->mask' is not NULLed, as it should be
|
|
* accessible as long as the RCU read lock is held.
|
|
*/
|
|
flow_mask_remove(table, flow->mask);
|
|
}
|
|
|
|
static struct sw_flow_mask *mask_alloc(void)
|
|
{
|
|
struct sw_flow_mask *mask;
|
|
|
|
mask = kmalloc(sizeof(*mask), GFP_KERNEL);
|
|
if (mask)
|
|
mask->ref_count = 1;
|
|
|
|
return mask;
|
|
}
|
|
|
|
static bool mask_equal(const struct sw_flow_mask *a,
|
|
const struct sw_flow_mask *b)
|
|
{
|
|
const u8 *a_ = (const u8 *)&a->key + a->range.start;
|
|
const u8 *b_ = (const u8 *)&b->key + b->range.start;
|
|
|
|
return (a->range.end == b->range.end)
|
|
&& (a->range.start == b->range.start)
|
|
&& (memcmp(a_, b_, range_n_bytes(&a->range)) == 0);
|
|
}
|
|
|
|
static struct sw_flow_mask *flow_mask_find(const struct flow_table *tbl,
|
|
const struct sw_flow_mask *mask)
|
|
{
|
|
struct list_head *ml;
|
|
|
|
list_for_each(ml, &tbl->mask_list) {
|
|
struct sw_flow_mask *m;
|
|
m = container_of(ml, struct sw_flow_mask, list);
|
|
if (mask_equal(mask, m))
|
|
return m;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Add 'mask' into the mask list, if it is not already there. */
|
|
static int flow_mask_insert(struct flow_table *tbl, struct sw_flow *flow,
|
|
const struct sw_flow_mask *new)
|
|
{
|
|
struct sw_flow_mask *mask;
|
|
mask = flow_mask_find(tbl, new);
|
|
if (!mask) {
|
|
/* Allocate a new mask if none exsits. */
|
|
mask = mask_alloc();
|
|
if (!mask)
|
|
return -ENOMEM;
|
|
mask->key = new->key;
|
|
mask->range = new->range;
|
|
list_add_rcu(&mask->list, &tbl->mask_list);
|
|
} else {
|
|
BUG_ON(!mask->ref_count);
|
|
mask->ref_count++;
|
|
}
|
|
|
|
flow->mask = mask;
|
|
return 0;
|
|
}
|
|
|
|
/* Must be called with OVS mutex held. */
|
|
static void flow_key_insert(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
struct table_instance *new_ti = NULL;
|
|
struct table_instance *ti;
|
|
|
|
flow->flow_table.hash = flow_hash(&flow->key, &flow->mask->range);
|
|
ti = ovsl_dereference(table->ti);
|
|
table_instance_insert(ti, flow);
|
|
table->count++;
|
|
|
|
/* Expand table, if necessary, to make room. */
|
|
if (table->count > ti->n_buckets)
|
|
new_ti = table_instance_expand(ti, false);
|
|
else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL))
|
|
new_ti = table_instance_rehash(ti, ti->n_buckets, false);
|
|
|
|
if (new_ti) {
|
|
rcu_assign_pointer(table->ti, new_ti);
|
|
call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
|
|
table->last_rehash = jiffies;
|
|
}
|
|
}
|
|
|
|
/* Must be called with OVS mutex held. */
|
|
static void flow_ufid_insert(struct flow_table *table, struct sw_flow *flow)
|
|
{
|
|
struct table_instance *ti;
|
|
|
|
flow->ufid_table.hash = ufid_hash(&flow->id);
|
|
ti = ovsl_dereference(table->ufid_ti);
|
|
ufid_table_instance_insert(ti, flow);
|
|
table->ufid_count++;
|
|
|
|
/* Expand table, if necessary, to make room. */
|
|
if (table->ufid_count > ti->n_buckets) {
|
|
struct table_instance *new_ti;
|
|
|
|
new_ti = table_instance_expand(ti, true);
|
|
if (new_ti) {
|
|
rcu_assign_pointer(table->ufid_ti, new_ti);
|
|
call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Must be called with OVS mutex held. */
|
|
int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
|
|
const struct sw_flow_mask *mask)
|
|
{
|
|
int err;
|
|
|
|
err = flow_mask_insert(table, flow, mask);
|
|
if (err)
|
|
return err;
|
|
flow_key_insert(table, flow);
|
|
if (ovs_identifier_is_ufid(&flow->id))
|
|
flow_ufid_insert(table, flow);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Initializes the flow module.
|
|
* Returns zero if successful or a negative error code. */
|
|
int ovs_flow_init(void)
|
|
{
|
|
BUILD_BUG_ON(__alignof__(struct sw_flow_key) % __alignof__(long));
|
|
BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long));
|
|
|
|
flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow)
|
|
+ (nr_cpu_ids
|
|
* sizeof(struct flow_stats *)),
|
|
0, 0, NULL);
|
|
if (flow_cache == NULL)
|
|
return -ENOMEM;
|
|
|
|
flow_stats_cache
|
|
= kmem_cache_create("sw_flow_stats", sizeof(struct flow_stats),
|
|
0, SLAB_HWCACHE_ALIGN, NULL);
|
|
if (flow_stats_cache == NULL) {
|
|
kmem_cache_destroy(flow_cache);
|
|
flow_cache = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Uninitializes the flow module. */
|
|
void ovs_flow_exit(void)
|
|
{
|
|
kmem_cache_destroy(flow_stats_cache);
|
|
kmem_cache_destroy(flow_cache);
|
|
}
|