dpctl: dpif: Add kernel datapath cache hit output.

This patch adds cache usage statistics to the output:

 $ ovs-dpctl show
 system@ovs-system:
   lookups: hit:24 missed:71 lost:0
   flows: 0
   masks: hit:334 total:0 hit/pkt:3.52
   cache: hit:4 hit-rate:4.21%
   port 0: ovs-system (internal)
   port 1: genev_sys_6081 (geneve: packet_type=ptap)
   port 2: br-int (internal)
   port 3: br-ex (internal)
   port 4: eth2
   port 5: sw1p1 (internal)
   port 6: sw0p4 (internal)

Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Acked-by: Paolo Valerio <pvalerio@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/dpctl.c b/lib/dpctl.c
index ef8ae7402..54a42a403 100644
--- a/lib/dpctl.c
+++ b/lib/dpctl.c
@@ -611,6 +611,15 @@ show_dpif(struct dpif *dpif, struct dpctl_params *dpctl_p)
             dpctl_print(dpctl_p, "  masks: hit:%"PRIu64" total:%"PRIu32
                                  " hit/pkt:%.2f\n",
                         stats.n_mask_hit, stats.n_masks, avg);
+
+            if (stats.n_cache_hit != UINT64_MAX) {
+                double avg_hits = n_pkts ?
+                    (double) stats.n_cache_hit / n_pkts * 100 : 0.0;
+
+                dpctl_print(dpctl_p,
+                            "  cache: hit:%"PRIu64" hit-rate:%.2f%%\n",
+                            stats.n_cache_hit, avg_hits);
+            }
         }
     }