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Merge branch 'net-openvswitch-masks-cache-enhancements'

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Eelco Chaudron says:

====================
net: openvswitch: masks cache enhancements

This patchset adds two enhancements to the Open vSwitch masks cache.

Changes in v4 [patch 2/2 only]:
 - Remove null check before calling free_percpu()
 - Make ovs_dp_change() return appropriate error codes

Changes in v3 [patch 2/2 only]:
 - Use is_power_of_2() function
 - Use array_size() function
 - Fix remaining sparse errors

Changes in v2 [patch 2/2 only]:
 - Fix sparse warnings
 - Fix netlink policy items reported by Florian Westphal
====================

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-08-03 15:17:48 -07:00
commit b90a126918
5 changed files with 139 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/uapi/linux/openvswitch.h
View File

@ -86,6 +86,7 @@ enum ovs_datapath_attr {
OVS_DP_ATTR_MEGAFLOW_STATS, /* struct ovs_dp_megaflow_stats */
OVS_DP_ATTR_USER_FEATURES, /* OVS_DP_F_* */
OVS_DP_ATTR_PAD,
OVS_DP_ATTR_MASKS_CACHE_SIZE,
__OVS_DP_ATTR_MAX
};
@ -102,8 +103,8 @@ struct ovs_dp_megaflow_stats {
__u64 n_mask_hit; /* Number of masks used for flow lookups. */
__u32 n_masks; /* Number of masks for the datapath. */
__u32 pad0; /* Pad for future expension. */
__u64 n_cache_hit; /* Number of cache matches for flow lookups. */
__u64 pad1; /* Pad for future expension. */
__u64 pad2; /* Pad for future expension. */
};
struct ovs_vport_stats {

22
net/openvswitch/datapath.c
View File

@ -225,13 +225,14 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
struct dp_stats_percpu *stats;
u64 *stats_counter;
u32 n_mask_hit;
u32 n_cache_hit;
int error;
stats = this_cpu_ptr(dp->stats_percpu);
/* Look up flow. */
flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb),
&n_mask_hit);
&n_mask_hit, &n_cache_hit);
if (unlikely(!flow)) {
struct dp_upcall_info upcall;
@ -262,6 +263,7 @@ out:
u64_stats_update_begin(&stats->syncp);
(*stats_counter)++;
stats->n_mask_hit += n_mask_hit;
stats->n_cache_hit += n_cache_hit;
u64_stats_update_end(&stats->syncp);
}
@ -699,6 +701,7 @@ static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
stats->n_missed += local_stats.n_missed;
stats->n_lost += local_stats.n_lost;
mega_stats->n_mask_hit += local_stats.n_mask_hit;
mega_stats->n_cache_hit += local_stats.n_cache_hit;
}
}
@ -1495,6 +1498,7 @@ static size_t ovs_dp_cmd_msg_size(void)
msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_stats));
msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats));
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
return msgsize;
}
@ -1532,6 +1536,10 @@ static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features))
goto nla_put_failure;
if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE,
ovs_flow_tbl_masks_cache_size(&dp->table)))
goto nla_put_failure;
genlmsg_end(skb, ovs_header);
return 0;
@ -1596,6 +1604,16 @@ static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
#endif
}
if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
int err;
u32 cache_size;
cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size);
if (err)
return err;
}
dp->user_features = user_features;
if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
@ -1884,6 +1902,8 @@ static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
[OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
};
static const struct genl_ops dp_datapath_genl_ops[] = {

3
net/openvswitch/datapath.h
View File

@ -38,12 +38,15 @@
* @n_mask_hit: Number of masks looked up for flow match.
* @n_mask_hit / (@n_hit + @n_missed) will be the average masks looked
* up per packet.
* @n_cache_hit: The number of received packets that had their mask found using
* the mask cache.
*/
struct dp_stats_percpu {
u64 n_hit;
u64 n_missed;
u64 n_lost;
u64 n_mask_hit;
u64 n_cache_hit;
struct u64_stats_sync syncp;
};

120
net/openvswitch/flow_table.c
View File

@ -38,8 +38,8 @@
#define MASK_ARRAY_SIZE_MIN 16
#define REHASH_INTERVAL (10 * 60 * HZ)
#define MC_DEFAULT_HASH_ENTRIES 256
#define MC_HASH_SHIFT 8
#define MC_HASH_ENTRIES (1u << MC_HASH_SHIFT)
#define MC_HASH_SEGS ((sizeof(uint32_t) * 8) / MC_HASH_SHIFT)
static struct kmem_cache *flow_cache;
@ -341,15 +341,79 @@ static void flow_mask_remove(struct flow_table *tbl, struct sw_flow_mask *mask)
}
}
static void __mask_cache_destroy(struct mask_cache *mc)
{
free_percpu(mc->mask_cache);
kfree(mc);
}
static void mask_cache_rcu_cb(struct rcu_head *rcu)
{
struct mask_cache *mc = container_of(rcu, struct mask_cache, rcu);
__mask_cache_destroy(mc);
}
static struct mask_cache *tbl_mask_cache_alloc(u32 size)
{
struct mask_cache_entry __percpu *cache = NULL;
struct mask_cache *new;
/* Only allow size to be 0, or a power of 2, and does not exceed
* percpu allocation size.
*/
if ((!is_power_of_2(size) && size != 0) ||
(size * sizeof(struct mask_cache_entry)) > PCPU_MIN_UNIT_SIZE)
return NULL;
new = kzalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return NULL;
new->cache_size = size;
if (new->cache_size > 0) {
cache = __alloc_percpu(array_size(sizeof(struct mask_cache_entry),
new->cache_size),
__alignof__(struct mask_cache_entry));
if (!cache) {
kfree(new);
return NULL;
}
}
new->mask_cache = cache;
return new;
}
int ovs_flow_tbl_masks_cache_resize(struct flow_table *table, u32 size)
{
struct mask_cache *mc = rcu_dereference(table->mask_cache);
struct mask_cache *new;
if (size == mc->cache_size)
return 0;
if ((!is_power_of_2(size) && size != 0) ||
(size * sizeof(struct mask_cache_entry)) > PCPU_MIN_UNIT_SIZE)
return -EINVAL;
new = tbl_mask_cache_alloc(size);
if (!new)
return -ENOMEM;
rcu_assign_pointer(table->mask_cache, new);
call_rcu(&mc->rcu, mask_cache_rcu_cb);
return 0;
}
int ovs_flow_tbl_init(struct flow_table *table)
{
struct table_instance *ti, *ufid_ti;
struct mask_cache *mc;
struct mask_array *ma;
table->mask_cache = __alloc_percpu(sizeof(struct mask_cache_entry) *
MC_HASH_ENTRIES,
__alignof__(struct mask_cache_entry));
if (!table->mask_cache)
mc = tbl_mask_cache_alloc(MC_DEFAULT_HASH_ENTRIES);
if (!mc)
return -ENOMEM;
ma = tbl_mask_array_alloc(MASK_ARRAY_SIZE_MIN);
@ -367,6 +431,7 @@ int ovs_flow_tbl_init(struct flow_table *table)
rcu_assign_pointer(table->ti, ti);
rcu_assign_pointer(table->ufid_ti, ufid_ti);
rcu_assign_pointer(table->mask_array, ma);
rcu_assign_pointer(table->mask_cache, mc);
table->last_rehash = jiffies;
table->count = 0;
table->ufid_count = 0;
@ -377,7 +442,7 @@ free_ti:
free_mask_array:
__mask_array_destroy(ma);
free_mask_cache:
free_percpu(table->mask_cache);
__mask_cache_destroy(mc);
return -ENOMEM;
}
@ -453,9 +518,11 @@ 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);
struct mask_cache *mc = rcu_dereference(table->mask_cache);
struct mask_array *ma = rcu_dereference_ovsl(table->mask_array);
free_percpu(table->mask_cache);
call_rcu(&table->mask_array->rcu, mask_array_rcu_cb);
call_rcu(&mc->rcu, mask_cache_rcu_cb);
call_rcu(&ma->rcu, mask_array_rcu_cb);
table_instance_destroy(table, ti, ufid_ti, false);
}
@ -667,6 +734,7 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
struct mask_array *ma,
const struct sw_flow_key *key,
u32 *n_mask_hit,
u32 *n_cache_hit,
u32 *index)
{
u64 *usage_counters = this_cpu_ptr(ma->masks_usage_cntr);
@ -682,6 +750,7 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
u64_stats_update_begin(&ma->syncp);
usage_counters[*index]++;
u64_stats_update_end(&ma->syncp);
(*n_cache_hit)++;
return flow;
}
}
@ -719,8 +788,10 @@ static struct sw_flow *flow_lookup(struct flow_table *tbl,
struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
const struct sw_flow_key *key,
u32 skb_hash,
u32 *n_mask_hit)
u32 *n_mask_hit,
u32 *n_cache_hit)
{
struct mask_cache *mc = rcu_dereference(tbl->mask_cache);
struct mask_array *ma = rcu_dereference(tbl->mask_array);
struct table_instance *ti = rcu_dereference(tbl->ti);
struct mask_cache_entry *entries, *ce;
@ -729,10 +800,13 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
int seg;
*n_mask_hit = 0;
if (unlikely(!skb_hash)) {
*n_cache_hit = 0;
if (unlikely(!skb_hash || mc->cache_size == 0)) {
u32 mask_index = 0;
u32 cache = 0;
return flow_lookup(tbl, ti, ma, key, n_mask_hit, &mask_index);
return flow_lookup(tbl, ti, ma, key, n_mask_hit, &cache,
&mask_index);
}
/* Pre and post recirulation flows usually have the same skb_hash
@ -743,17 +817,17 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
ce = NULL;
hash = skb_hash;
entries = this_cpu_ptr(tbl->mask_cache);
entries = this_cpu_ptr(mc->mask_cache);
/* Find the cache entry 'ce' to operate on. */
for (seg = 0; seg < MC_HASH_SEGS; seg++) {
int index = hash & (MC_HASH_ENTRIES - 1);
int index = hash & (mc->cache_size - 1);
struct mask_cache_entry *e;
e = &entries[index];
if (e->skb_hash == skb_hash) {
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit,
&e->mask_index);
n_cache_hit, &e->mask_index);
if (!flow)
e->skb_hash = 0;
return flow;
@ -766,10 +840,12 @@ struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *tbl,
}
/* Cache miss, do full lookup. */
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit, &ce->mask_index);
flow = flow_lookup(tbl, ti, ma, key, n_mask_hit, n_cache_hit,
&ce->mask_index);
if (flow)
ce->skb_hash = skb_hash;
*n_cache_hit = 0;
return flow;
}
@ -779,9 +855,10 @@ struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *tbl,
struct table_instance *ti = rcu_dereference_ovsl(tbl->ti);
struct mask_array *ma = rcu_dereference_ovsl(tbl->mask_array);
u32 __always_unused n_mask_hit;
u32 __always_unused n_cache_hit;
u32 index = 0;
return flow_lookup(tbl, ti, ma, key, &n_mask_hit, &index);
return flow_lookup(tbl, ti, ma, key, &n_mask_hit, &n_cache_hit, &index);
}
struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,
@ -858,6 +935,13 @@ int ovs_flow_tbl_num_masks(const struct flow_table *table)
return READ_ONCE(ma->count);
}
u32 ovs_flow_tbl_masks_cache_size(const struct flow_table *table)
{
struct mask_cache *mc = rcu_dereference(table->mask_cache);
return READ_ONCE(mc->cache_size);
}
static struct table_instance *table_instance_expand(struct table_instance *ti,
bool ufid)
{
@ -1086,8 +1170,8 @@ void ovs_flow_masks_rebalance(struct flow_table *table)
for (i = 0; i < masks_entries; i++) {
int index = masks_and_count[i].index;
new->masks[new->count++] =
rcu_dereference_ovsl(ma->masks[index]);
if (ovsl_dereference(ma->masks[index]))
new->masks[new->count++] = ma->masks[index];
}
rcu_assign_pointer(table->mask_array, new);

13
net/openvswitch/flow_table.h
View File

@ -27,6 +27,12 @@ struct mask_cache_entry {
u32 mask_index;
};
struct mask_cache {
struct rcu_head rcu;
u32 cache_size; /* Must be ^2 value. */
struct mask_cache_entry __percpu *mask_cache;
};
struct mask_count {
int index;
u64 counter;
@ -53,7 +59,7 @@ struct table_instance {
struct flow_table {
struct table_instance __rcu *ti;
struct table_instance __rcu *ufid_ti;
struct mask_cache_entry __percpu *mask_cache;
struct mask_cache __rcu *mask_cache;
struct mask_array __rcu *mask_array;
unsigned long last_rehash;
unsigned int count;
@ -77,12 +83,15 @@ int ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
const struct sw_flow_mask *mask);
void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow);
int ovs_flow_tbl_num_masks(const struct flow_table *table);
u32 ovs_flow_tbl_masks_cache_size(const struct flow_table *table);
int ovs_flow_tbl_masks_cache_resize(struct flow_table *table, u32 size);
struct sw_flow *ovs_flow_tbl_dump_next(struct table_instance *table,
u32 *bucket, u32 *idx);
struct sw_flow *ovs_flow_tbl_lookup_stats(struct flow_table *,
const struct sw_flow_key *,
u32 skb_hash,
u32 *n_mask_hit);
u32 *n_mask_hit,
u32 *n_cache_hit);
struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *,
const struct sw_flow_key *);
struct sw_flow *ovs_flow_tbl_lookup_exact(struct flow_table *tbl,