ovs-numa: Add function for getting numa node id from core id.

Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>

2 files changed, 24 insertions, 0 deletions

diff --git a/lib/ovs-numa.c b/lib/ovs-numa.c
index bcdea3b48..46989672c 100644
--- a/lib/ovs-numa.c
+++ b/lib/ovs-numa.c
@@ -168,6 +168,23 @@ ovs_numa_get_n_cores(void)
                                : OVS_CORE_UNSPEC;
 }
 
+/* Given 'core_id', returns the corresponding numa node id.  Returns
+ * OVS_NUMA_UNSPEC if 'core_id' is invalid. */
+int
+ovs_numa_get_numa_id(int core_id)
+{
+    if (ovs_numa_core_id_is_valid(core_id)) {
+        struct cpu_core *core;
+
+        core = CONTAINER_OF(hmap_first_with_hash(&all_cpu_cores,
+                                                 hash_int(core_id, 0)),
+                            struct cpu_core, hmap_node);
+
+        return core->numa->numa_id;
+    }
+    return OVS_NUMA_UNSPEC;
+}
+
 /* Returns the number of cpu cores on numa node.  Returns OVS_CORE_UNSPEC
  * if 'numa_id' is invalid. */
 int
diff --git a/lib/ovs-numa.h b/lib/ovs-numa.h
index d4a57a592..83732fc68 100644
--- a/lib/ovs-numa.h
+++ b/lib/ovs-numa.h
@@ -32,6 +32,7 @@ bool ovs_numa_numa_id_is_valid(int numa_id);
 bool ovs_numa_core_id_is_valid(int core_id);
 int ovs_numa_get_n_numas(void);
 int ovs_numa_get_n_cores(void);
+int ovs_numa_get_numa_id(int core_id);
 int ovs_numa_get_n_cores_on_numa(int numa_id);
 int ovs_numa_get_n_unpinned_cores_on_numa(int numa_id);
 bool ovs_numa_try_pin_core_specific(int core_id);
@@ -72,6 +73,12 @@ ovs_numa_get_n_cores(void)
 }
 
 static inline int
+ovs_numa_get_numa_id(int core_id OVS_UNUSED)
+{
+    return OVS_NUMA_UNSPEC;
+}
+
+static inline int
 ovs_numa_get_n_cores_on_numa(int numa_id OVS_UNUSED)
 {
     return OVS_CORE_UNSPEC;