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dpif-netdev: Use cmap instead of hmap.

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This requires less locking and makes introducing lockless classifier
lookups possible.

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Jarno Rajahalme
2014-07-04 06:38:47 -07:00
parent 6dfee9ae37
commit 9f361d6b29
1 changed files with 26 additions and 34 deletions
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60
lib/dpif-netdev.c
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@@ -39,7 +39,7 @@
#include "dummy.h"
#include "dynamic-string.h"
#include "flow.h"
#include "hmap.h"
#include "cmap.h"
#include "latch.h"
#include "list.h"
#include "meta-flow.h"
@@ -136,15 +136,17 @@ struct dp_netdev {
/* Flows.
*
* Readers of 'cls' and 'flow_table' must take a 'cls->rwlock' read lock.
* Readers of 'cls' must take a 'cls->rwlock' read lock.
*
* Writers of 'cls' and 'flow_table' must take the 'flow_mutex' and then
* the 'cls->rwlock' write lock. (The outer 'flow_mutex' allows writers to
* atomically perform multiple operations on 'cls' and 'flow_table'.)
* Writers of 'flow_table' must take the 'flow_mutex'.
*
* Writers of 'cls' must take the 'flow_mutex' and then the 'cls->rwlock'
* write lock. (The outer 'flow_mutex' allows writers to atomically
* perform multiple operations on 'cls' and 'flow_table'.)
*/
struct ovs_mutex flow_mutex;
struct classifier cls; /* Classifier. Protected by cls.rwlock. */
struct hmap flow_table OVS_GUARDED; /* Flow table. */
struct cmap flow_table OVS_GUARDED; /* Flow table. */
/* Queues.
*
@@ -262,7 +264,7 @@ struct dp_netdev_flow {
const struct cls_rule cr; /* In owning dp_netdev's 'cls'. */
/* Hash table index by unmasked flow. */
const struct hmap_node node; /* In owning dp_netdev's 'flow_table'. */
const struct cmap_node node; /* In owning dp_netdev's 'flow_table'. */
const struct flow flow; /* The flow that created this entry. */
/* Statistics.
@@ -486,7 +488,7 @@ create_dp_netdev(const char *name, const struct dpif_class *class,
ovs_mutex_init(&dp->flow_mutex);
classifier_init(&dp->cls, NULL);
hmap_init(&dp->flow_table);
cmap_init(&dp->flow_table);
fat_rwlock_init(&dp->queue_rwlock);
@@ -587,7 +589,7 @@ dp_netdev_free(struct dp_netdev *dp)
fat_rwlock_destroy(&dp->queue_rwlock);
classifier_destroy(&dp->cls);
hmap_destroy(&dp->flow_table);
cmap_destroy(&dp->flow_table);
ovs_mutex_destroy(&dp->flow_mutex);
seq_destroy(dp->port_seq);
cmap_destroy(&dp->ports);
@@ -641,9 +643,7 @@ dpif_netdev_get_stats(const struct dpif *dpif, struct dpif_dp_stats *stats)
struct dp_netdev_stats *bucket;
size_t i;
fat_rwlock_rdlock(&dp->cls.rwlock);
stats->n_flows = hmap_count(&dp->flow_table);
fat_rwlock_unlock(&dp->cls.rwlock);
stats->n_flows = cmap_count(&dp->flow_table);
stats->n_hit = stats->n_missed = stats->n_lost = 0;
OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &dp->stats) {
@@ -959,10 +959,10 @@ dp_netdev_remove_flow(struct dp_netdev *dp, struct dp_netdev_flow *flow)
OVS_REQUIRES(dp->flow_mutex)
{
struct cls_rule *cr = CONST_CAST(struct cls_rule *, &flow->cr);
struct hmap_node *node = CONST_CAST(struct hmap_node *, &flow->node);
struct cmap_node *node = CONST_CAST(struct cmap_node *, &flow->node);
classifier_remove(&dp->cls, cr);
hmap_remove(&dp->flow_table, node);
cmap_remove(&dp->flow_table, node, flow_hash(&flow->flow, 0));
ovsrcu_postpone(dp_netdev_flow_free, flow);
}
@@ -973,7 +973,7 @@ dp_netdev_flow_flush(struct dp_netdev *dp)
ovs_mutex_lock(&dp->flow_mutex);
fat_rwlock_wrlock(&dp->cls.rwlock);
HMAP_FOR_EACH_SAFE (netdev_flow, next, node, &dp->flow_table) {
CMAP_FOR_EACH_SAFE (netdev_flow, next, node, &dp->flow_table) {
dp_netdev_remove_flow(dp, netdev_flow);
}
fat_rwlock_unlock(&dp->cls.rwlock);
@@ -1086,11 +1086,10 @@ dp_netdev_lookup_flow(const struct dp_netdev *dp, const struct miniflow *key)
static struct dp_netdev_flow *
dp_netdev_find_flow(const struct dp_netdev *dp, const struct flow *flow)
OVS_REQ_RDLOCK(dp->cls.rwlock)
{
struct dp_netdev_flow *netdev_flow;
HMAP_FOR_EACH_WITH_HASH (netdev_flow, node, flow_hash(flow, 0),
CMAP_FOR_EACH_WITH_HASH (netdev_flow, node, flow_hash(flow, 0),
&dp->flow_table) {
if (flow_equal(&netdev_flow->flow, flow)) {
return netdev_flow;
@@ -1225,9 +1224,7 @@ dpif_netdev_flow_get(const struct dpif *dpif,
return error;
}
fat_rwlock_rdlock(&dp->cls.rwlock);
netdev_flow = dp_netdev_find_flow(dp, &key);
fat_rwlock_unlock(&dp->cls.rwlock);
if (netdev_flow) {
if (stats) {
@@ -1268,12 +1265,12 @@ dp_netdev_flow_add(struct dp_netdev *dp, const struct flow *flow,
match_init(&match, flow, wc);
cls_rule_init(CONST_CAST(struct cls_rule *, &netdev_flow->cr),
&match, NETDEV_RULE_PRIORITY);
cmap_insert(&dp->flow_table,
CONST_CAST(struct cmap_node *, &netdev_flow->node),
flow_hash(flow, 0));
fat_rwlock_wrlock(&dp->cls.rwlock);
classifier_insert(&dp->cls,
CONST_CAST(struct cls_rule *, &netdev_flow->cr));
hmap_insert(&dp->flow_table,
CONST_CAST(struct hmap_node *, &netdev_flow->node),
flow_hash(flow, 0));
fat_rwlock_unlock(&dp->cls.rwlock);
return 0;
@@ -1323,7 +1320,7 @@ dpif_netdev_flow_put(struct dpif *dpif, const struct dpif_flow_put *put)
fat_rwlock_unlock(&dp->cls.rwlock);
if (!netdev_flow) {
if (put->flags & DPIF_FP_CREATE) {
if (hmap_count(&dp->flow_table) < MAX_FLOWS) {
if (cmap_count(&dp->flow_table) < MAX_FLOWS) {
if (put->stats) {
memset(put->stats, 0, sizeof *put->stats);
}
@@ -1382,17 +1379,17 @@ dpif_netdev_flow_del(struct dpif *dpif, const struct dpif_flow_del *del)
}
ovs_mutex_lock(&dp->flow_mutex);
fat_rwlock_wrlock(&dp->cls.rwlock);
netdev_flow = dp_netdev_find_flow(dp, &key);
if (netdev_flow) {
if (del->stats) {
get_dpif_flow_stats(netdev_flow, del->stats);
}
fat_rwlock_wrlock(&dp->cls.rwlock);
dp_netdev_remove_flow(dp, netdev_flow);
fat_rwlock_unlock(&dp->cls.rwlock);
} else {
error = ENOENT;
}
fat_rwlock_unlock(&dp->cls.rwlock);
ovs_mutex_unlock(&dp->flow_mutex);
return error;
@@ -1400,8 +1397,7 @@ dpif_netdev_flow_del(struct dpif *dpif, const struct dpif_flow_del *del)
struct dpif_netdev_flow_dump {
struct dpif_flow_dump up;
uint32_t bucket;
uint32_t offset;
struct cmap_position pos;
int status;
struct ovs_mutex mutex;
};
@@ -1419,8 +1415,7 @@ dpif_netdev_flow_dump_create(const struct dpif *dpif_)
dump = xmalloc(sizeof *dump);
dpif_flow_dump_init(&dump->up, dpif_);
dump->bucket = 0;
dump->offset = 0;
memset(&dump->pos, 0, sizeof dump->pos);
dump->status = 0;
ovs_mutex_init(&dump->mutex);
@@ -1487,13 +1482,11 @@ dpif_netdev_flow_dump_next(struct dpif_flow_dump_thread *thread_,
ovs_mutex_lock(&dump->mutex);
if (!dump->status) {
fat_rwlock_rdlock(&dp->cls.rwlock);
for (n_flows = 0; n_flows < MIN(max_flows, FLOW_DUMP_MAX_BATCH);
n_flows++) {
struct hmap_node *node;
struct cmap_node *node;
node = hmap_at_position(&dp->flow_table, &dump->bucket,
&dump->offset);
node = cmap_next_position(&dp->flow_table, &dump->pos);
if (!node) {
dump->status = EOF;
break;
@@ -1501,7 +1494,6 @@ dpif_netdev_flow_dump_next(struct dpif_flow_dump_thread *thread_,
netdev_flows[n_flows] = CONTAINER_OF(node, struct dp_netdev_flow,
node);
}
fat_rwlock_unlock(&dp->cls.rwlock);
}
ovs_mutex_unlock(&dump->mutex);