It is possible for packets traversing the userspace datapath to match a
flow before hitting on EMC by using a mark ID provided by a NIC. Add a
PMD statistic for this hit.

Signed-off-by: Cian Ferriter <[email protected]>
---
 NEWS                     | 2 ++
 lib/dpif-netdev-avx512.c | 3 +++
 lib/dpif-netdev-perf.c   | 3 +++
 lib/dpif-netdev-perf.h   | 1 +
 lib/dpif-netdev.c        | 9 +++++++--
 tests/pmd.at             | 6 ++++--
 6 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/NEWS b/NEWS
index 402ce5969..3eab5f4fa 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,8 @@ Post-v2.15.0
    - Userspace datapath:
      * Auto load balancing of PMDs now partially supports cross-NUMA polling
        cases, e.g if all PMD threads are running on the same NUMA node.
+     * Add a partial HWOL PMD statistic counting hits similar to existing
+     * EMC/SMC/DPCLS stats.
    - ovs-ctl:
      * New option '--no-record-hostname' to disable hostname configuration
        in ovsdb on startup.
diff --git a/lib/dpif-netdev-avx512.c b/lib/dpif-netdev-avx512.c
index e255c9d17..5c6f54799 100644
--- a/lib/dpif-netdev-avx512.c
+++ b/lib/dpif-netdev-avx512.c
@@ -114,6 +114,7 @@ dp_netdev_input_outer_avx512(struct dp_netdev_pmd_thread 
*pmd,
     const uint32_t emc_enabled = pmd->ctx.emc_insert_min != 0;
     const uint32_t smc_enabled = pmd->ctx.smc_enable_db;
 
+    uint32_t phwol_hits = 0;
     uint32_t emc_hits = 0;
     uint32_t smc_hits = 0;
 
@@ -147,6 +148,7 @@ dp_netdev_input_outer_avx512(struct dp_netdev_pmd_thread 
*pmd,
                 pkt_meta[i].tcp_flags = parse_tcp_flags(packet);
 
                 pkt_meta[i].bytes = dp_packet_size(packet);
+                phwol_hits++;
                 hwol_emc_smc_hitmask |= (1 << i);
                 continue;
             }
@@ -235,6 +237,7 @@ dp_netdev_input_outer_avx512(struct dp_netdev_pmd_thread 
*pmd,
 
     /* At this point we don't return error anymore, so commit stats here. */
     pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_RECV, batch_size);
+    pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_PHWOL_HIT, phwol_hits);
     pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_EXACT_HIT, emc_hits);
     pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_SMC_HIT, smc_hits);
     pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_MASKED_HIT,
diff --git a/lib/dpif-netdev-perf.c b/lib/dpif-netdev-perf.c
index 9560e7c3c..7103a2d4d 100644
--- a/lib/dpif-netdev-perf.c
+++ b/lib/dpif-netdev-perf.c
@@ -246,6 +246,7 @@ pmd_perf_format_overall_stats(struct ds *str, struct 
pmd_perf_stats *s,
         ds_put_format(str,
             "  Rx packets:        %12"PRIu64"  (%.0f Kpps, %.0f cycles/pkt)\n"
             "  Datapath passes:   %12"PRIu64"  (%.2f passes/pkt)\n"
+            "  - PHWOL hits:      %12"PRIu64"  (%5.1f %%)\n"
             "  - EMC hits:        %12"PRIu64"  (%5.1f %%)\n"
             "  - SMC hits:        %12"PRIu64"  (%5.1f %%)\n"
             "  - Megaflow hits:   %12"PRIu64"  (%5.1f %%, %.2f "
@@ -255,6 +256,8 @@ pmd_perf_format_overall_stats(struct ds *str, struct 
pmd_perf_stats *s,
             rx_packets, (rx_packets / duration) / 1000,
             1.0 * stats[PMD_CYCLES_ITER_BUSY] / rx_packets,
             passes, rx_packets ? 1.0 * passes / rx_packets : 0,
+            stats[PMD_STAT_PHWOL_HIT],
+            100.0 * stats[PMD_STAT_PHWOL_HIT] / passes,
             stats[PMD_STAT_EXACT_HIT],
             100.0 * stats[PMD_STAT_EXACT_HIT] / passes,
             stats[PMD_STAT_SMC_HIT],
diff --git a/lib/dpif-netdev-perf.h b/lib/dpif-netdev-perf.h
index 72645b6b3..8b1a52387 100644
--- a/lib/dpif-netdev-perf.h
+++ b/lib/dpif-netdev-perf.h
@@ -56,6 +56,7 @@ extern "C" {
 /* Set of counter types maintained in pmd_perf_stats. */
 
 enum pmd_stat_type {
+    PMD_STAT_PHWOL_HIT,     /* Packets that had a partial HWOL hit (phwol). */
     PMD_STAT_EXACT_HIT,     /* Packets that had an exact match (emc). */
     PMD_STAT_SMC_HIT,       /* Packets that had a sig match hit (SMC). */
     PMD_STAT_MASKED_HIT,    /* Packets that matched in the flow table. */
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index b35ccbe3b..f161ae7f5 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -660,6 +660,7 @@ pmd_info_show_stats(struct ds *reply,
                   "  packets received: %"PRIu64"\n"
                   "  packet recirculations: %"PRIu64"\n"
                   "  avg. datapath passes per packet: %.02f\n"
+                  "  phwol hits: %"PRIu64"\n"
                   "  emc hits: %"PRIu64"\n"
                   "  smc hits: %"PRIu64"\n"
                   "  megaflow hits: %"PRIu64"\n"
@@ -668,7 +669,8 @@ pmd_info_show_stats(struct ds *reply,
                   "  miss with failed upcall: %"PRIu64"\n"
                   "  avg. packets per output batch: %.02f\n",
                   total_packets, stats[PMD_STAT_RECIRC],
-                  passes_per_pkt, stats[PMD_STAT_EXACT_HIT],
+                  passes_per_pkt, stats[PMD_STAT_PHWOL_HIT],
+                  stats[PMD_STAT_EXACT_HIT],
                   stats[PMD_STAT_SMC_HIT],
                   stats[PMD_STAT_MASKED_HIT], lookups_per_hit,
                   stats[PMD_STAT_MISS], stats[PMD_STAT_LOST],
@@ -1685,6 +1687,7 @@ dpif_netdev_get_stats(const struct dpif *dpif, struct 
dpif_dp_stats *stats)
     CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
         stats->n_flows += cmap_count(&pmd->flow_table);
         pmd_perf_read_counters(&pmd->perf_stats, pmd_stats);
+        stats->n_hit += pmd_stats[PMD_STAT_PHWOL_HIT];
         stats->n_hit += pmd_stats[PMD_STAT_EXACT_HIT];
         stats->n_hit += pmd_stats[PMD_STAT_SMC_HIT];
         stats->n_hit += pmd_stats[PMD_STAT_MASKED_HIT];
@@ -6697,7 +6700,7 @@ dfc_processing(struct dp_netdev_pmd_thread *pmd,
                bool md_is_valid, odp_port_t port_no)
 {
     struct netdev_flow_key *key = &keys[0];
-    size_t n_missed = 0, n_emc_hit = 0;
+    size_t n_missed = 0, n_emc_hit = 0, n_phwol_hit = 0;
     struct dfc_cache *cache = &pmd->flow_cache;
     struct dp_packet *packet;
     const size_t cnt = dp_packet_batch_size(packets_);
@@ -6739,6 +6742,7 @@ dfc_processing(struct dp_netdev_pmd_thread *pmd,
             flow = mark_to_flow_find(pmd, mark);
             if (OVS_LIKELY(flow)) {
                 tcp_flags = parse_tcp_flags(packet);
+                n_phwol_hit++;
                 if (OVS_LIKELY(batch_enable)) {
                     dp_netdev_queue_batches(packet, flow, tcp_flags, batches,
                                             n_batches);
@@ -6801,6 +6805,7 @@ dfc_processing(struct dp_netdev_pmd_thread *pmd,
     /* Count of packets which are not flow batched. */
     *n_flows = map_cnt;
 
+    pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_PHWOL_HIT, n_phwol_hit);
     pmd_perf_update_counter(&pmd->perf_stats, PMD_STAT_EXACT_HIT, n_emc_hit);
 
     if (!smc_enable_db) {
diff --git a/tests/pmd.at b/tests/pmd.at
index cc5371d5a..34a59d502 100644
--- a/tests/pmd.at
+++ b/tests/pmd.at
@@ -202,11 +202,12 @@ dummy@ovs-dummy: hit:0 missed:0
     p0 7/1: (dummy-pmd: configured_rx_queues=4, 
configured_tx_queues=<cleared>, requested_rx_queues=4, 
requested_tx_queues=<cleared>)
 ])
 
-AT_CHECK([ovs-appctl dpif-netdev/pmd-stats-show | sed SED_NUMA_CORE_PATTERN | 
sed '/cycles/d' | grep pmd -A 9], [0], [dnl
+AT_CHECK([ovs-appctl dpif-netdev/pmd-stats-show | sed SED_NUMA_CORE_PATTERN | 
sed '/cycles/d' | grep pmd -A 10], [0], [dnl
 pmd thread numa_id <cleared> core_id <cleared>:
   packets received: 0
   packet recirculations: 0
   avg. datapath passes per packet: 0.00
+  phwol hits: 0
   emc hits: 0
   smc hits: 0
   megaflow hits: 0
@@ -233,11 +234,12 @@ AT_CHECK([cat ovs-vswitchd.log | filter_flow_install | 
strip_xout], [0], [dnl
 
recirc_id(0),in_port(1),packet_type(ns=0,id=0),eth(src=50:54:00:00:00:77,dst=50:54:00:00:01:78),eth_type(0x0800),ipv4(frag=no),
 actions: <del>
 ])
 
-AT_CHECK([ovs-appctl dpif-netdev/pmd-stats-show | sed SED_NUMA_CORE_PATTERN | 
sed '/cycles/d' | grep pmd -A 9], [0], [dnl
+AT_CHECK([ovs-appctl dpif-netdev/pmd-stats-show | sed SED_NUMA_CORE_PATTERN | 
sed '/cycles/d' | grep pmd -A 10], [0], [dnl
 pmd thread numa_id <cleared> core_id <cleared>:
   packets received: 20
   packet recirculations: 0
   avg. datapath passes per packet: 1.00
+  phwol hits: 0
   emc hits: 19
   smc hits: 0
   megaflow hits: 0
-- 
2.31.1

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