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ofproto-dpif: Make it easier to credit statistics for resubmits.

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Until now, crediting statistics to OpenFlow rules due to "resubmit" actions
has required setting up a "resubmit hook" with a callback function and
auxiliary data.  This commit makes it easier to do, by adding a member to
struct action_xlate_ctx that specifies statistics to credit to each
resubmitted rule.

This commit includes one small behavioral change as an optimization.
Previously, rule_execute() translated the rule twice: once to get the ODP
actions, then a second time after executing the ODP actions to credit
statistics to the rules.  After this commit, rule_execute() translates the
rule only once, crediting statistics as a side effect.  The difference only
becomes visible when executing the actions fails: previously the statistics
would not be incremented, after this commit they will be.  It is very
unusual for executing actions to fail (generally this indicates a bug) so
I'm not concerned about it.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-04-13 14:09:10 -07:00
parent c23740be66
commit 112bc5f46f
2 changed files with 59 additions and 61 deletions
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3
lib/dpif.c
View File

@@ -674,8 +674,7 @@ dpif_port_poll_wait(const struct dpif *dpif)
}
/* Extracts the flow stats for a packet. The 'flow' and 'packet'
* arguments must have been initialized through a call to flow_extract().
*/
* arguments must have been initialized through a call to flow_extract(). */
void
dpif_flow_stats_extract(const struct flow *flow, const struct ofpbuf *packet,
struct dpif_flow_stats *stats)

117
ofproto/ofproto-dpif.c
View File

@@ -105,10 +105,10 @@ static struct rule_dpif *rule_dpif_cast(const struct rule *rule)
static struct rule_dpif *rule_dpif_lookup(struct ofproto_dpif *,
const struct flow *, uint8_t table);
static void rule_credit_stats(struct rule_dpif *,
const struct dpif_flow_stats *);
static void flow_push_stats(struct rule_dpif *, const struct flow *,
uint64_t packets, uint64_t bytes,
long long int used);
const struct dpif_flow_stats *);
static tag_type rule_calculate_tag(const struct flow *,
const struct flow_wildcards *,
uint32_t basis);
@@ -225,13 +225,23 @@ struct action_xlate_ctx {
* timeouts.) */
uint8_t tcp_flags;
/* If nonnull, called just before executing a resubmit action. In
* addition, disables logging of traces when the recursion depth is
* exceeded.
/* If nonnull, flow translation calls this function just before executing a
* resubmit or OFPP_TABLE action. In addition, disables logging of traces
* when the recursion depth is exceeded.
*
* 'rule' is the rule being submitted into. It will be null if the
* resubmit or OFPP_TABLE action didn't find a matching rule.
*
* This is normally null so the client has to set it manually after
* calling action_xlate_ctx_init(). */
void (*resubmit_hook)(struct action_xlate_ctx *, struct rule_dpif *);
void (*resubmit_hook)(struct action_xlate_ctx *, struct rule_dpif *rule);
/* If nonnull, flow translation credits the specified statistics to each
* rule reached through a resubmit or OFPP_TABLE action.
*
* This is normally null so the client has to set it manually after
* calling action_xlate_ctx_init(). */
const struct dpif_flow_stats *resubmit_stats;
/* xlate_actions() initializes and uses these members. The client might want
* to look at them after it returns. */
@@ -3767,68 +3777,52 @@ facet_reset_counters(struct facet *facet)
static void
facet_push_stats(struct facet *facet)
{
uint64_t new_packets, new_bytes;
struct dpif_flow_stats stats;
assert(facet->packet_count >= facet->prev_packet_count);
assert(facet->byte_count >= facet->prev_byte_count);
assert(facet->used >= facet->prev_used);
new_packets = facet->packet_count - facet->prev_packet_count;
new_bytes = facet->byte_count - facet->prev_byte_count;
stats.n_packets = facet->packet_count - facet->prev_packet_count;
stats.n_bytes = facet->byte_count - facet->prev_byte_count;
stats.used = facet->used;
stats.tcp_flags = 0;
if (new_packets || new_bytes || facet->used > facet->prev_used) {
if (stats.n_packets || stats.n_bytes || facet->used > facet->prev_used) {
facet->prev_packet_count = facet->packet_count;
facet->prev_byte_count = facet->byte_count;
facet->prev_used = facet->used;
flow_push_stats(facet->rule, &facet->flow,
new_packets, new_bytes, facet->used);
flow_push_stats(facet->rule, &facet->flow, &stats);
update_mirror_stats(ofproto_dpif_cast(facet->rule->up.ofproto),
facet->mirrors, new_packets, new_bytes);
facet->mirrors, stats.n_packets, stats.n_bytes);
}
}
struct ofproto_push {
struct action_xlate_ctx ctx;
uint64_t packets;
uint64_t bytes;
long long int used;
};
static void
push_resubmit(struct action_xlate_ctx *ctx, struct rule_dpif *rule)
rule_credit_stats(struct rule_dpif *rule, const struct dpif_flow_stats *stats)
{
struct ofproto_push *push = CONTAINER_OF(ctx, struct ofproto_push, ctx);
if (rule) {
rule->packet_count += push->packets;
rule->byte_count += push->bytes;
ofproto_rule_update_used(&rule->up, push->used);
}
rule->packet_count += stats->n_packets;
rule->byte_count += stats->n_bytes;
ofproto_rule_update_used(&rule->up, stats->used);
}
/* Pushes flow statistics to the rules which 'flow' resubmits into given
* 'rule''s actions and mirrors. */
static void
flow_push_stats(struct rule_dpif *rule,
const struct flow *flow, uint64_t packets, uint64_t bytes,
long long int used)
const struct flow *flow, const struct dpif_flow_stats *stats)
{
struct ofproto_dpif *ofproto = ofproto_dpif_cast(rule->up.ofproto);
struct ofproto_push push;
struct action_xlate_ctx ctx;
push.packets = packets;
push.bytes = bytes;
push.used = used;
ofproto_rule_update_used(&rule->up, stats->used);
ofproto_rule_update_used(&rule->up, used);
action_xlate_ctx_init(&push.ctx, ofproto, flow, flow->vlan_tci, rule,
action_xlate_ctx_init(&ctx, ofproto, flow, flow->vlan_tci, rule,
0, NULL);
push.ctx.resubmit_hook = push_resubmit;
xlate_actions_for_side_effects(&push.ctx,
rule->up.actions, rule->up.n_actions);
ctx.resubmit_stats = stats;
xlate_actions_for_side_effects(&ctx, rule->up.actions, rule->up.n_actions);
}
/* Subfacets. */
@@ -4262,22 +4256,24 @@ rule_execute(struct rule *rule_, const struct flow *flow,
struct rule_dpif *rule = rule_dpif_cast(rule_);
struct ofproto_dpif *ofproto = ofproto_dpif_cast(rule->up.ofproto);
size_t size = packet->size;
struct dpif_flow_stats stats;
struct action_xlate_ctx ctx;
uint64_t odp_actions_stub[1024 / 8];
struct ofpbuf odp_actions;
dpif_flow_stats_extract(flow, packet, &stats);
rule_credit_stats(rule, &stats);
ofpbuf_use_stub(&odp_actions, odp_actions_stub, sizeof odp_actions_stub);
action_xlate_ctx_init(&ctx, ofproto, flow, flow->vlan_tci,
rule, packet_get_tcp_flags(packet, flow), packet);
rule, stats.tcp_flags, packet);
ctx.resubmit_stats = &stats;
xlate_actions(&ctx, rule->up.actions, rule->up.n_actions, &odp_actions);
if (execute_odp_actions(ofproto, flow, odp_actions.data,
odp_actions.size, packet)) {
rule->packet_count++;
rule->byte_count += size;
flow_push_stats(rule, flow, 1, size, time_msec());
}
execute_odp_actions(ofproto, flow, odp_actions.data,
odp_actions.size, packet);
ofpbuf_uninit(&odp_actions);
return 0;
@@ -4540,6 +4536,10 @@ xlate_table_action(struct action_xlate_ctx *ctx,
if (rule) {
struct rule_dpif *old_rule = ctx->rule;
if (ctx->resubmit_stats) {
rule_credit_stats(rule, ctx->resubmit_stats);
}
ctx->recurse++;
ctx->rule = rule;
do_xlate_actions(rule->up.actions, rule->up.n_actions, ctx);
@@ -5140,6 +5140,7 @@ action_xlate_ctx_init(struct action_xlate_ctx *ctx,
ctx->may_learn = packet != NULL;
ctx->tcp_flags = tcp_flags;
ctx->resubmit_hook = NULL;
ctx->resubmit_stats = NULL;
}
/* Translates the 'n_in' "union ofp_action"s in 'in' into datapath actions in
@@ -5951,28 +5952,26 @@ packet_out(struct ofproto *ofproto_, struct ofpbuf *packet,
ofproto->max_ports);
if (!error) {
struct odputil_keybuf keybuf;
struct dpif_flow_stats stats;
struct ofpbuf key;
struct action_xlate_ctx ctx;
uint64_t odp_actions_stub[1024 / 8];
struct ofpbuf odp_actions;
struct ofproto_push push;
ofpbuf_use_stack(&key, &keybuf, sizeof keybuf);
odp_flow_key_from_flow(&key, flow);
action_xlate_ctx_init(&push.ctx, ofproto, flow, flow->vlan_tci, NULL,
packet_get_tcp_flags(packet, flow), packet);
dpif_flow_stats_extract(flow, packet, &stats);
/* Ensure that resubmits in 'ofp_actions' get accounted to their
* matching rules. */
push.packets = 1;
push.bytes = packet->size;
push.used = time_msec();
push.ctx.resubmit_hook = push_resubmit;
action_xlate_ctx_init(&ctx, ofproto, flow, flow->vlan_tci, NULL,
packet_get_tcp_flags(packet, flow), packet);
ctx.resubmit_stats = &stats;
ofpbuf_use_stub(&odp_actions,
odp_actions_stub, sizeof odp_actions_stub);
xlate_actions(&push.ctx, ofp_actions, n_ofp_actions, &odp_actions);
xlate_actions(&ctx, ofp_actions, n_ofp_actions, &odp_actions);
dpif_execute(ofproto->dpif, key.data, key.size,
odp_actions.data, odp_actions.size, packet);
ofpbuf_uninit(&odp_actions);