#include <linux/if_vlan.h>
#include <net/llc_pdu.h>
#include <linux/kernel.h>
-#include <linux/jhash.h>
+#include <linux/hash.h>
#include <linux/jiffies.h>
#include <linux/llc.h>
#include <linux/module.h>
#include "vlan.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)
{
void ovs_flow_mask_key(struct sw_flow_key *dst, const struct sw_flow_key *src,
const struct sw_flow_mask *mask)
{
- const long *m = (long *)((u8 *)&mask->key + mask->range.start);
- const long *s = (long *)((u8 *)src + mask->range.start);
+ const long *m = (const long *)((const u8 *)&mask->key +
+ mask->range.start);
+ const long *s = (const long *)((const u8 *)src +
+ mask->range.start);
long *d = (long *)((u8 *)dst + mask->range.start);
int i;
struct sw_flow *ovs_flow_alloc(void)
{
struct sw_flow *flow;
+ struct flow_stats *stats;
+ int node;
flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
if (!flow)
return ERR_PTR(-ENOMEM);
- spin_lock_init(&flow->lock);
flow->sf_acts = NULL;
flow->mask = NULL;
+ flow->stats_last_writer = NUMA_NO_NODE;
+
+ /* Initialize the default stat node. */
+ stats = kmem_cache_alloc_node(flow_stats_cache,
+ GFP_KERNEL | __GFP_ZERO, 0);
+ if (!stats)
+ goto err;
+
+ spin_lock_init(&stats->lock);
+
+ RCU_INIT_POINTER(flow->stats[0], stats);
+
+ for_each_node(node)
+ if (node != 0)
+ RCU_INIT_POINTER(flow->stats[node], NULL);
return flow;
+err:
+ kmem_cache_free(flow_cache, flow);
+ return ERR_PTR(-ENOMEM);
+}
+
+int ovs_flow_tbl_count(struct flow_table *table)
+{
+ return table->count;
}
static struct flex_array *alloc_buckets(unsigned int n_buckets)
static void flow_free(struct sw_flow *flow)
{
- kfree((struct sf_flow_acts __force *)flow->sf_acts);
+ int node;
+
+ kfree((struct sw_flow_actions __force *)flow->sf_acts);
+ for_each_node(node)
+ if (flow->stats[node])
+ kmem_cache_free(flow_stats_cache,
+ (struct flow_stats __force *)flow->stats[node]);
kmem_cache_free(flow_cache, flow);
}
flow_free(flow);
}
+static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu)
+{
+ struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu);
+
+ kfree(mask);
+}
+
void ovs_flow_free(struct sw_flow *flow, bool deferred)
{
if (!flow)
return;
- ovs_sw_flow_mask_del_ref(flow->mask, deferred);
-
if (deferred)
call_rcu(&flow->rcu, rcu_free_flow_callback);
else
flex_array_free(buckets);
}
-static void __flow_tbl_destroy(struct flow_table *table)
-{
- int i;
-
- if (table->keep_flows)
- goto skip_flows;
-
- for (i = 0; i < table->n_buckets; i++) {
- struct sw_flow *flow;
- struct hlist_head *head = flex_array_get(table->buckets, i);
- struct hlist_node *n;
- int ver = table->node_ver;
-
- hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
- hlist_del(&flow->hash_node[ver]);
- ovs_flow_free(flow, false);
- }
- }
-
- BUG_ON(!list_empty(table->mask_list));
- kfree(table->mask_list);
-skip_flows:
- free_buckets(table->buckets);
- kfree(table);
+static void __table_instance_destroy(struct table_instance *ti)
+{
+ free_buckets(ti->buckets);
+ kfree(ti);
}
-static struct flow_table *__flow_tbl_alloc(int new_size)
+static struct table_instance *table_instance_alloc(int new_size)
{
- struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
+ struct table_instance *ti = kmalloc(sizeof(*ti), GFP_KERNEL);
- if (!table)
+ if (!ti)
return NULL;
- table->buckets = alloc_buckets(new_size);
+ ti->buckets = alloc_buckets(new_size);
- if (!table->buckets) {
- kfree(table);
+ if (!ti->buckets) {
+ kfree(ti);
return NULL;
}
- table->n_buckets = new_size;
- table->count = 0;
- table->node_ver = 0;
- table->keep_flows = false;
- get_random_bytes(&table->hash_seed, sizeof(u32));
- table->mask_list = NULL;
+ ti->n_buckets = new_size;
+ ti->node_ver = 0;
+ ti->keep_flows = false;
+ get_random_bytes(&ti->hash_seed, sizeof(u32));
- return table;
+ return ti;
}
-struct flow_table *ovs_flow_tbl_alloc(int new_size)
+int ovs_flow_tbl_init(struct flow_table *table)
{
- struct flow_table *table = __flow_tbl_alloc(new_size);
+ struct table_instance *ti;
- if (!table)
- return NULL;
+ ti = table_instance_alloc(TBL_MIN_BUCKETS);
- table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL);
- if (!table->mask_list) {
- table->keep_flows = true;
- __flow_tbl_destroy(table);
- return NULL;
- }
- INIT_LIST_HEAD(table->mask_list);
+ if (!ti)
+ return -ENOMEM;
- return table;
+ rcu_assign_pointer(table->ti, ti);
+ INIT_LIST_HEAD(&table->mask_list);
+ table->last_rehash = jiffies;
+ table->count = 0;
+ return 0;
}
static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
{
- struct flow_table *table = container_of(rcu, struct flow_table, rcu);
+ struct table_instance *ti = container_of(rcu, struct table_instance, rcu);
- __flow_tbl_destroy(table);
+ __table_instance_destroy(ti);
}
-void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
+static void table_instance_destroy(struct table_instance *ti, bool deferred)
{
- if (!table)
+ int i;
+
+ if (!ti)
return;
+ 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;
+
+ hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
+ hlist_del_rcu(&flow->hash_node[ver]);
+ ovs_flow_free(flow, deferred);
+ }
+ }
+
+skip_flows:
if (deferred)
- call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
+ call_rcu(&ti->rcu, flow_tbl_destroy_rcu_cb);
else
- __flow_tbl_destroy(table);
+ __table_instance_destroy(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 = (struct table_instance __force *)table->ti;
+
+ table_instance_destroy(ti, false);
}
-struct sw_flow *ovs_flow_tbl_dump_next(struct flow_table *table,
+struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *ti,
u32 *bucket, u32 *last)
{
struct sw_flow *flow;
int ver;
int i;
- ver = table->node_ver;
- while (*bucket < table->n_buckets) {
+ ver = ti->node_ver;
+ while (*bucket < ti->n_buckets) {
i = 0;
- head = flex_array_get(table->buckets, *bucket);
+ head = flex_array_get(ti->buckets, *bucket);
hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
if (i < *last) {
i++;
return NULL;
}
-static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
+static struct hlist_head *find_bucket(struct table_instance *ti, u32 hash)
{
- hash = jhash_1word(hash, table->hash_seed);
- return flex_array_get(table->buckets,
- (hash & (table->n_buckets - 1)));
+ hash = jhash_1word(hash, ti->hash_seed);
+ return flex_array_get(ti->buckets,
+ (hash & (ti->n_buckets - 1)));
}
-static void __tbl_insert(struct flow_table *table, struct sw_flow *flow)
+static void table_instance_insert(struct table_instance *ti, struct sw_flow *flow)
{
struct hlist_head *head;
- head = find_bucket(table, flow->hash);
- hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
-
- table->count++;
+ head = find_bucket(ti, flow->hash);
+ hlist_add_head_rcu(&flow->hash_node[ti->node_ver], head);
}
-static void flow_table_copy_flows(struct flow_table *old,
- struct flow_table *new)
+static void flow_table_copy_flows(struct table_instance *old,
+ struct table_instance *new)
{
int old_ver;
int i;
head = flex_array_get(old->buckets, i);
hlist_for_each_entry(flow, head, hash_node[old_ver])
- __tbl_insert(new, flow);
+ table_instance_insert(new, flow);
}
- new->mask_list = old->mask_list;
old->keep_flows = true;
}
-static struct flow_table *__flow_tbl_rehash(struct flow_table *table,
+static struct table_instance *table_instance_rehash(struct table_instance *ti,
int n_buckets)
{
- struct flow_table *new_table;
+ struct table_instance *new_ti;
- new_table = __flow_tbl_alloc(n_buckets);
- if (!new_table)
- return ERR_PTR(-ENOMEM);
+ new_ti = table_instance_alloc(n_buckets);
+ if (!new_ti)
+ return NULL;
- flow_table_copy_flows(table, new_table);
+ flow_table_copy_flows(ti, new_ti);
- return new_table;
+ return new_ti;
}
-struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
+int ovs_flow_tbl_flush(struct flow_table *flow_table)
{
- return __flow_tbl_rehash(table, table->n_buckets);
-}
+ struct table_instance *old_ti;
+ struct table_instance *new_ti;
-struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
-{
- return __flow_tbl_rehash(table, table->n_buckets * 2);
+ old_ti = ovsl_dereference(flow_table->ti);
+ new_ti = table_instance_alloc(TBL_MIN_BUCKETS);
+ if (!new_ti)
+ return -ENOMEM;
+
+ rcu_assign_pointer(flow_table->ti, new_ti);
+ flow_table->last_rehash = jiffies;
+ flow_table->count = 0;
+
+ table_instance_destroy(old_ti, true);
+ return 0;
}
static u32 flow_hash(const struct sw_flow_key *key, int key_start,
int key_end)
{
- u32 *hash_key = (u32 *)((u8 *)key + key_start);
+ 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);
+ return arch_fast_hash2(hash_key, hash_u32s, 0);
}
static int flow_key_start(const struct sw_flow_key *key)
const struct sw_flow_key *key2,
int key_start, int key_end)
{
- const long *cp1 = (long *)((u8 *)key1 + key_start);
- const long *cp2 = (long *)((u8 *)key2 + key_start);
+ 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;
return cmp_key(&flow->unmasked_key, key, key_start, key_end);
}
-static struct sw_flow *masked_flow_lookup(struct flow_table *table,
+static struct sw_flow *masked_flow_lookup(struct table_instance *ti,
const struct sw_flow_key *unmasked,
struct sw_flow_mask *mask)
{
ovs_flow_mask_key(&masked_key, unmasked, mask);
hash = flow_hash(&masked_key, key_start, key_end);
- head = find_bucket(table, hash);
- hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
- if (flow->mask == mask &&
+ head = find_bucket(ti, hash);
+ hlist_for_each_entry_rcu(flow, head, hash_node[ti->node_ver]) {
+ if (flow->mask == mask && flow->hash == hash &&
flow_cmp_masked_key(flow, &masked_key,
key_start, key_end))
return flow;
return NULL;
}
-struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
- const struct sw_flow_key *key)
+struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
+ const struct sw_flow_key *key,
+ u32 *n_mask_hit)
{
- struct sw_flow *flow = NULL;
+ struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
struct sw_flow_mask *mask;
+ struct sw_flow *flow;
- list_for_each_entry_rcu(mask, tbl->mask_list, list) {
- flow = masked_flow_lookup(tbl, key, mask);
+ *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 */
- break;
+ return flow;
}
-
- return flow;
+ return NULL;
}
-void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow)
+struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
+ const struct sw_flow_key *key)
{
- flow->hash = flow_hash(&flow->key, flow->mask->range.start,
- flow->mask->range.end);
- __tbl_insert(table, flow);
-}
+ u32 __always_unused n_mask_hit;
-void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
-{
- BUG_ON(table->count == 0);
- hlist_del_rcu(&flow->hash_node[table->node_ver]);
- table->count--;
+ return ovs_flow_tbl_lookup_stats(tbl, key, &n_mask_hit);
}
-struct sw_flow_mask *ovs_sw_flow_mask_alloc(void)
+int ovs_flow_tbl_num_masks(const struct flow_table *table)
{
struct sw_flow_mask *mask;
+ int num = 0;
- mask = kmalloc(sizeof(*mask), GFP_KERNEL);
- if (mask)
- mask->ref_count = 0;
+ list_for_each_entry(mask, &table->mask_list, list)
+ num++;
- return mask;
+ return num;
}
-void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *mask)
+static struct table_instance *table_instance_expand(struct table_instance *ti)
{
- mask->ref_count++;
+ return table_instance_rehash(ti, ti->n_buckets * 2);
}
-static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu)
+/* 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)
{
- struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu);
+ if (mask) {
+ /* ovs-lock is required to protect mask-refcount and
+ * mask list.
+ */
+ ASSERT_OVSL();
+ BUG_ON(!mask->ref_count);
+ mask->ref_count--;
- kfree(mask);
+ if (!mask->ref_count) {
+ list_del_rcu(&mask->list);
+ call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
+ }
+ }
}
-void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred)
+/* Must be called with OVS mutex held. */
+void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
{
- if (!mask)
- return;
+ struct table_instance *ti = ovsl_dereference(table->ti);
+
+ BUG_ON(table->count == 0);
+ hlist_del_rcu(&flow->hash_node[ti->node_ver]);
+ table->count--;
- BUG_ON(!mask->ref_count);
- mask->ref_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);
+}
- if (!mask->ref_count) {
- list_del_rcu(&mask->list);
- if (deferred)
- call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
- else
- kfree(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)
{
- u8 *a_ = (u8 *)&a->key + a->range.start;
- u8 *b_ = (u8 *)&b->key + b->range.start;
+ 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);
}
-struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *tbl,
+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) {
+ 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 NULL;
}
-/**
- * add a new mask into the mask list.
- * The caller needs to make sure that 'mask' is not the same
- * as any masks that are already on the list.
- */
-void ovs_sw_flow_mask_insert(struct flow_table *tbl, struct sw_flow_mask *mask)
+/* 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,
+ struct sw_flow_mask *new)
{
- list_add_rcu(&mask->list, tbl->mask_list);
+ 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. */
+int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
+ struct sw_flow_mask *mask)
+{
+ struct table_instance *new_ti = NULL;
+ struct table_instance *ti;
+ int err;
+
+ err = flow_mask_insert(table, flow, mask);
+ if (err)
+ return err;
+
+ flow->hash = flow_hash(&flow->key, flow->mask->range.start,
+ flow->mask->range.end);
+ 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);
+ else if (time_after(jiffies, table->last_rehash + REHASH_INTERVAL))
+ new_ti = table_instance_rehash(ti, ti->n_buckets);
+
+ if (new_ti) {
+ rcu_assign_pointer(table->ti, new_ti);
+ table_instance_destroy(ti, true);
+ table->last_rehash = jiffies;
+ }
+ return 0;
}
/* Initializes the flow module.
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), 0,
- 0, NULL);
+ flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow)
+ + (num_possible_nodes()
+ * 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);
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff