mem: fix allocation failure on non-NUMA kernel

Running dpdk-helloworld on Linux with lib numa present, but no kernel
support for NUMA (CONFIG_NUMA=n) causes rte_service_init() to fail with
EAL: error allocating rte services array.

alloc_seg() calls get_mempolicy to verify that the allocation
has happened on the correct socket, but receives ENOSYS from
the kernel and fails the allocation.

The allocated socket should only be verified if check_numa() is true.

Fixes: 2a96c88be83e ("mem: ease init in a docker container")
Cc: stable@dpdk.org
Signed-off-by: Nick Connolly <nick.connolly@mayadata.io>
Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/linux/eal_memalloc.c b/lib/librte_eal/linux/eal_memalloc.c
index 40a5c4a..6dc1b2b 100644 (file)
--- a/lib/librte_eal/linux/eal_memalloc.c
+++ b/lib/librte_eal/linux/eal_memalloc.c
@@ -625,17 +625,25 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
        }
 
 #ifdef RTE_EAL_NUMA_AWARE_HUGEPAGES
-       ret = get_mempolicy(&cur_socket_id, NULL, 0, addr,
-                           MPOL_F_NODE | MPOL_F_ADDR);
-       if (ret < 0) {
-               RTE_LOG(DEBUG, EAL, "%s(): get_mempolicy: %s\n",
-                       __func__, strerror(errno));
-               goto mapped;
-       } else if (cur_socket_id != socket_id) {
-               RTE_LOG(DEBUG, EAL,
-                               "%s(): allocation happened on wrong socket (wanted %d, got %d)\n",
-                       __func__, socket_id, cur_socket_id);
-               goto mapped;
+       /*
+        * If the kernel has been built without NUMA support, get_mempolicy()
+        * will return an error. If check_numa() returns false, memory
+        * allocation is not NUMA aware and the socket_id should not be
+        * checked.
+        */
+       if (check_numa()) {
+               ret = get_mempolicy(&cur_socket_id, NULL, 0, addr,
+                                       MPOL_F_NODE | MPOL_F_ADDR);
+               if (ret < 0) {
+                       RTE_LOG(DEBUG, EAL, "%s(): get_mempolicy: %s\n",
+                               __func__, strerror(errno));
+                       goto mapped;
+               } else if (cur_socket_id != socket_id) {
+                       RTE_LOG(DEBUG, EAL,
+                                       "%s(): allocation happened on wrong socket (wanted %d, got %d)\n",
+                               __func__, socket_id, cur_socket_id);
+                       goto mapped;
+               }
        }
 #else
        if (rte_socket_count() > 1)