[dpdk-dev] [PATCH v3 02/30] net/ena/base: make allocation macros thread-safe

[Michal Krawczyk <mk@semihalf.com>]

From: Igor Chauskin <igorch@amazon.com>

Memory allocation region id could possibly be non-unique
due to non-atomic increment, causing allocation failure.

Fixes: 9ba7981ec992 ("ena: add communication layer for DPDK")
Cc: stable@dpdk.org

Signed-off-by: Igor Chauskin <igorch@amazon.com>
Reviewed-by: Michal Krawczyk <mk@semihalf.com>
Reviewed-by: Guy Tzalik <gtzalik@amazon.com>
---
v3:
  * Update the copyright date in modified files

 drivers/net/ena/base/ena_plat_dpdk.h | 10 ++++++----
 drivers/net/ena/ena_ethdev.c         |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ena/base/ena_plat_dpdk.h b/drivers/net/ena/base/ena_plat_dpdk.h
index b611fb204b..70261bdbc6 100644
--- a/drivers/net/ena/base/ena_plat_dpdk.h
+++ b/drivers/net/ena/base/ena_plat_dpdk.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: BSD-3-Clause
- * Copyright (c) 2015-2019 Amazon.com, Inc. or its affiliates.
+ * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
  * All rights reserved.
  */
 
@@ -180,7 +180,7 @@ do {                                                                   \
  * Each rte_memzone should have unique name.
  * To satisfy it, count number of allocations and add it to name.
  */
-extern uint32_t ena_alloc_cnt;
+extern rte_atomic32_t ena_alloc_cnt;
 
 #define ENA_MEM_ALLOC_COHERENT(dmadev, size, virt, phys, handle)	\
 	do {								\
@@ -188,7 +188,8 @@ extern uint32_t ena_alloc_cnt;
 		char z_name[RTE_MEMZONE_NAMESIZE];			\
 		ENA_TOUCH(dmadev); ENA_TOUCH(handle);			\
 		snprintf(z_name, sizeof(z_name),			\
-				"ena_alloc_%d", ena_alloc_cnt++);	\
+			 "ena_alloc_%d",				\
+			 rte_atomic32_add_return(&ena_alloc_cnt, 1));	\
 		mz = rte_memzone_reserve(z_name, size, SOCKET_ID_ANY,	\
 				RTE_MEMZONE_IOVA_CONTIG);		\
 		handle = mz;						\
@@ -213,7 +214,8 @@ extern uint32_t ena_alloc_cnt;
 		char z_name[RTE_MEMZONE_NAMESIZE];			\
 		ENA_TOUCH(dmadev); ENA_TOUCH(dev_node);			\
 		snprintf(z_name, sizeof(z_name),			\
-				"ena_alloc_%d", ena_alloc_cnt++);	\
+			 "ena_alloc_%d",				\
+			 rte_atomic32_add_return(&ena_alloc_cnt, 1));	\
 		mz = rte_memzone_reserve(z_name, size, node,		\
 				RTE_MEMZONE_IOVA_CONTIG);		\
 		mem_handle = mz;					\
diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index 64aabbbb19..e0ed28419c 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -89,7 +89,7 @@ struct ena_stats {
  * Each rte_memzone should have unique name.
  * To satisfy it, count number of allocation and add it to name.
  */
-uint32_t ena_alloc_cnt;
+rte_atomic32_t ena_alloc_cnt;
 
 static const struct ena_stats ena_stats_global_strings[] = {
 	ENA_STAT_GLOBAL_ENTRY(wd_expired),
-- 
2.20.1