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Code Issues Releases Wiki Activity

dpif-netdev: Avoid reading RSS hash when EMC is disabled.

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When EMC is disabled the reading of RSS hash is skipped.
Also, for packets that are not recirculated it retrieves
the hash value without considering the recirc id.

Signed-off-by: Antonio Fischetti <antonio.fischetti@intel.com>
Acked-by: Billy O'Mahony <billy.o.mahony@intel.com>
Signed-off-by: Darrell Ball <dlu998@gmail.com>
This commit is contained in:
Fischetti, Antonio
2017-09-22 01:56:28 -07:00
committed by Darrell Ball
parent 8c319e8b73
commit bde94613e6
1 changed files with 28 additions and 4 deletions
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32
lib/dpif-netdev.c
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@@ -4764,6 +4764,22 @@ dp_netdev_upcall(struct dp_netdev_pmd_thread *pmd, struct dp_packet *packet_,
actions, wc, put_actions, dp->upcall_aux);
}
static inline uint32_t
dpif_netdev_packet_get_rss_hash_orig_pkt(struct dp_packet *packet,
const struct miniflow *mf)
{
uint32_t hash;
if (OVS_LIKELY(dp_packet_rss_valid(packet))) {
hash = dp_packet_get_rss_hash(packet);
} else {
hash = miniflow_hash_5tuple(mf, 0);
dp_packet_set_rss_hash(packet, hash);
}
return hash;
}
static inline uint32_t
dpif_netdev_packet_get_rss_hash(struct dp_packet *packet,
const struct miniflow *mf)
@@ -4902,10 +4918,18 @@ emc_processing(struct dp_netdev_pmd_thread *pmd,
}
miniflow_extract(packet, &key->mf);
key->len = 0; /* Not computed yet. */
key->hash = dpif_netdev_packet_get_rss_hash(packet, &key->mf);
/* If EMC is disabled skip emc_lookup */
flow = (cur_min == 0) ? NULL: emc_lookup(flow_cache, key);
/* If EMC is disabled skip hash computation and emc_lookup */
if (cur_min) {
if (!md_is_valid) {
key->hash = dpif_netdev_packet_get_rss_hash_orig_pkt(packet,
&key->mf);
} else {
key->hash = dpif_netdev_packet_get_rss_hash(packet, &key->mf);
}
flow = emc_lookup(flow_cache, key);
} else {
flow = NULL;
}
if (OVS_LIKELY(flow)) {
dp_netdev_queue_batches(packet, flow, &key->mf, batches,
n_batches);