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revalidator: Refactor revalidation early exit.
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Shift the early-exit conditions for revalidation into a separate
function.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>
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@joestringer
joestringer committed Sep 29, 2016
1 parent c1c5c12 commit 95beec1
Showing 1 changed file with 78 additions and 58 deletions.
136 changes: 78 additions & 58 deletions ofproto/ofproto-dpif-upcall.c
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Expand Up @@ -1806,6 +1806,11 @@ should_revalidate(const struct udpif *udpif, uint64_t packets,
{
long long int metric, now, duration;

if (!used) {
/* Always revalidate the first time a flow is dumped. */
return true;
}

if (udpif->dump_duration < 200) {
/* We are likely to handle full revalidation for the flows. */
return true;
Expand Down Expand Up @@ -1884,39 +1889,18 @@ xlate_ukey(struct udpif *udpif, const struct udpif_key *ukey,
return 0;
}


/* Verifies that the datapath actions of 'ukey' are still correct, and pushes
* 'stats' for it.
*
* Returns a recommended action for 'ukey', options include:
* UKEY_DELETE The ukey should be deleted.
* UKEY_KEEP The ukey is fine as is.
* UKEY_MODIFY The ukey's actions should be changed but is otherwise
* fine. Callers should change the actions to those found
* in the caller supplied 'odp_actions' buffer. The
* recirculation references can be found in 'recircs' and
* must be handled by the caller.
*
* If the result is UKEY_MODIFY, then references to all recirc_ids used by the
* new flow will be held within 'recircs' (which may be none).
*
* The caller is responsible for both initializing 'recircs' prior this call,
* and ensuring any references are eventually freed.
*/
static enum reval_result
revalidate_ukey(struct udpif *udpif, struct udpif_key *ukey,
const struct dpif_flow_stats *stats,
struct ofpbuf *odp_actions, uint64_t reval_seq,
struct recirc_refs *recircs)
revalidate_ukey__(struct udpif *udpif, struct udpif_key *ukey,
const struct dpif_flow_stats *push,
struct ofpbuf *odp_actions, uint64_t reval_seq,
struct recirc_refs *recircs)
OVS_REQUIRES(ukey->mutex)
{
bool need_revalidate = (ukey->reval_seq != reval_seq);
struct xlate_out *xoutp;
struct netflow *netflow;
struct dpif_flow_stats push;
struct flow_wildcards dp_mask, wc;
enum reval_result result;
long long int last_used;
struct reval_context ctx = {
.odp_actions = odp_actions,
.netflow = &netflow,
Expand All @@ -1927,43 +1911,14 @@ revalidate_ukey(struct udpif *udpif, struct udpif_key *ukey,
xoutp = NULL;
netflow = NULL;

ofpbuf_clear(odp_actions);
last_used = ukey->stats.used;
push.used = stats->used;
push.tcp_flags = stats->tcp_flags;
push.n_packets = (stats->n_packets > ukey->stats.n_packets
? stats->n_packets - ukey->stats.n_packets
: 0);
push.n_bytes = (stats->n_bytes > ukey->stats.n_bytes
? stats->n_bytes - ukey->stats.n_bytes
: 0);

if (need_revalidate && last_used
&& !should_revalidate(udpif, push.n_packets, last_used)) {
goto exit;
}

/* We will push the stats, so update the ukey stats cache. */
ukey->stats = *stats;
if (!push.n_packets && !need_revalidate) {
result = UKEY_KEEP;
goto exit;
}

if (ukey->xcache && !need_revalidate) {
xlate_push_stats(ukey->xcache, &push);
result = UKEY_KEEP;
goto exit;
}

if (need_revalidate) {
xlate_cache_clear(ukey->xcache);
}
if (!ukey->xcache) {
ukey->xcache = xlate_cache_new();
}
ctx.xcache = ukey->xcache;
if (xlate_ukey(udpif, ukey, &push, &ctx)) {
if (xlate_ukey(udpif, ukey, push, &ctx)) {
goto exit;
}
xoutp = &ctx.xout;
Expand Down Expand Up @@ -2006,16 +1961,81 @@ revalidate_ukey(struct udpif *udpif, struct udpif_key *ukey,
result = UKEY_KEEP;

exit:
if (result != UKEY_DELETE) {
ukey->reval_seq = reval_seq;
}
if (netflow && result == UKEY_DELETE) {
netflow_flow_clear(netflow, &ctx.flow);
}
xlate_out_uninit(xoutp);
return result;
}

/* Verifies that the datapath actions of 'ukey' are still correct, and pushes
* 'stats' for it.
*
* Returns a recommended action for 'ukey', options include:
* UKEY_DELETE The ukey should be deleted.
* UKEY_KEEP The ukey is fine as is.
* UKEY_MODIFY The ukey's actions should be changed but is otherwise
* fine. Callers should change the actions to those found
* in the caller supplied 'odp_actions' buffer. The
* recirculation references can be found in 'recircs' and
* must be handled by the caller.
*
* If the result is UKEY_MODIFY, then references to all recirc_ids used by the
* new flow will be held within 'recircs' (which may be none).
*
* The caller is responsible for both initializing 'recircs' prior this call,
* and ensuring any references are eventually freed.
*/
static enum reval_result
revalidate_ukey(struct udpif *udpif, struct udpif_key *ukey,
const struct dpif_flow_stats *stats,
struct ofpbuf *odp_actions, uint64_t reval_seq,
struct recirc_refs *recircs)
OVS_REQUIRES(ukey->mutex)
{
bool need_revalidate = ukey->reval_seq != reval_seq;
enum reval_result result = UKEY_DELETE;
struct dpif_flow_stats push;

ofpbuf_clear(odp_actions);

push.used = stats->used;
push.tcp_flags = stats->tcp_flags;
push.n_packets = (stats->n_packets > ukey->stats.n_packets
? stats->n_packets - ukey->stats.n_packets
: 0);
push.n_bytes = (stats->n_bytes > ukey->stats.n_bytes
? stats->n_bytes - ukey->stats.n_bytes
: 0);

if (need_revalidate
&& !should_revalidate(udpif, push.n_packets, ukey->stats.used)) {
goto exit;
}

/* We will push the stats, so update the ukey stats cache. */
ukey->stats = *stats;
if (!push.n_packets && !need_revalidate) {
result = UKEY_KEEP;
goto exit;
}

if (ukey->xcache && !need_revalidate) {
xlate_push_stats(ukey->xcache, &push);
result = UKEY_KEEP;
goto exit;
}

result = revalidate_ukey__(udpif, ukey, &push, odp_actions, reval_seq,
recircs);

exit:
if (result != UKEY_DELETE) {
ukey->reval_seq = reval_seq;
}
return result;
}

static void
delete_op_init__(struct udpif *udpif, struct ukey_op *op,
const struct dpif_flow *flow)
Expand Down

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