[dpdk-dev] [PATCH v8 04/21] mem: do not check for invalid socket ID

Anatoly Burakov anatoly.burakov at intel.com
Mon Oct 1 14:56:12 CEST 2018


We will be assigning "invalid" socket ID's to external heap, and
malloc will now be able to verify if a supplied socket ID is in
fact a valid one, rendering parameter checks for sockets
obsolete.

This changes the semantics of what we understand by "socket ID",
so document the change in the release notes.

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 doc/guides/rel_notes/release_18_11.rst     | 7 +++++++
 lib/librte_eal/common/eal_common_memzone.c | 8 +++++---
 lib/librte_eal/common/malloc_heap.c        | 2 +-
 lib/librte_eal/common/rte_malloc.c         | 4 ----
 4 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index c627c1e88..9583f3eda 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -107,6 +107,13 @@ API Changes
   for any users of memseg-walk-related functions, as they will now have to skip
   externally allocated segments in most cases if the intent is to only iterate
   over internal DPDK memory.
+  ``socket_id`` parameter across the entire DPDK has gained additional meaning,
+  as some socket ID's will now be representing externally allocated memory. No
+  changes will be required for existing code as backwards compatibility will be
+  kept, and those who do not use this feature will not see these extra socket
+  ID's. Any new API's must not check socket ID parameters themselves, and must
+  instead leave it to the memory subsystem to decide whether socket ID is a
+  valid one.
 
 * mbuf: The ``__rte_mbuf_raw_free()`` and ``__rte_pktmbuf_prefree_seg()``
   functions were deprecated since 17.05 and are replaced by
diff --git a/lib/librte_eal/common/eal_common_memzone.c b/lib/librte_eal/common/eal_common_memzone.c
index 7300fe05d..b7081afbf 100644
--- a/lib/librte_eal/common/eal_common_memzone.c
+++ b/lib/librte_eal/common/eal_common_memzone.c
@@ -120,13 +120,15 @@ memzone_reserve_aligned_thread_unsafe(const char *name, size_t len,
 		return NULL;
 	}
 
-	if ((socket_id != SOCKET_ID_ANY) &&
-	    (socket_id >= RTE_MAX_NUMA_NODES || socket_id < 0)) {
+	if ((socket_id != SOCKET_ID_ANY) && socket_id < 0) {
 		rte_errno = EINVAL;
 		return NULL;
 	}
 
-	if (!rte_eal_has_hugepages())
+	/* only set socket to SOCKET_ID_ANY if we aren't allocating for an
+	 * external heap.
+	 */
+	if (!rte_eal_has_hugepages() && socket_id < RTE_MAX_NUMA_NODES)
 		socket_id = SOCKET_ID_ANY;
 
 	contig = (flags & RTE_MEMZONE_IOVA_CONTIG) != 0;
diff --git a/lib/librte_eal/common/malloc_heap.c b/lib/librte_eal/common/malloc_heap.c
index a9cfa423f..09b06061d 100644
--- a/lib/librte_eal/common/malloc_heap.c
+++ b/lib/librte_eal/common/malloc_heap.c
@@ -651,7 +651,7 @@ malloc_heap_alloc(const char *type, size_t size, int socket_arg,
 	if (size == 0 || (align && !rte_is_power_of_2(align)))
 		return NULL;
 
-	if (!rte_eal_has_hugepages())
+	if (!rte_eal_has_hugepages() && socket_arg < RTE_MAX_NUMA_NODES)
 		socket_arg = SOCKET_ID_ANY;
 
 	if (socket_arg == SOCKET_ID_ANY)
diff --git a/lib/librte_eal/common/rte_malloc.c b/lib/librte_eal/common/rte_malloc.c
index 73d6df31d..9ba1472c3 100644
--- a/lib/librte_eal/common/rte_malloc.c
+++ b/lib/librte_eal/common/rte_malloc.c
@@ -47,10 +47,6 @@ rte_malloc_socket(const char *type, size_t size, unsigned int align,
 	if (!rte_eal_has_hugepages())
 		socket_arg = SOCKET_ID_ANY;
 
-	/* Check socket parameter */
-	if (socket_arg >= RTE_MAX_NUMA_NODES)
-		return NULL;
-
 	return malloc_heap_alloc(type, size, socket_arg, 0,
 			align == 0 ? 1 : align, 0, false);
 }
-- 
2.17.1


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