[dpdk-dev] [PATCH 1/4] net/mlx5: fix memory event on secondary process

[Yongseok Koh <yskoh@mellanox.com>]

As the memory event is propagated to secondary processes, the event is
processed redundantly. This should be processed once because the data
structure used for MR and the event is global across the processes.

Fixes: 974f1e7ef146 ("net/mlx5: add new memory region support")
Cc: stable@dpdk.org

Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
---
 drivers/net/mlx5/mlx5.c    | 5 +++--
 drivers/net/mlx5/mlx5_mr.c | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 9706e351aa..f0ad5c73af 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -157,9 +157,10 @@ mlx5_prepare_shared_data(void)
 		if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 			LIST_INIT(&mlx5_shared_data->mem_event_cb_list);
 			rte_rwlock_init(&mlx5_shared_data->mem_event_rwlock);
+			rte_mem_event_callback_register("MLX5_MEM_EVENT_CB",
+							mlx5_mr_mem_event_cb,
+							NULL);
 		}
-		rte_mem_event_callback_register("MLX5_MEM_EVENT_CB",
-						mlx5_mr_mem_event_cb, NULL);
 	}
 	rte_spinlock_unlock(&mlx5_shared_data_lock);
 }
diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index 700d83d1bc..d336a77e40 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -891,6 +891,8 @@ mlx5_mr_mem_event_cb(enum rte_mem_event event_type, const void *addr,
 	struct mlx5_priv *priv;
 	struct mlx5_dev_list *dev_list = &mlx5_shared_data->mem_event_cb_list;
 
+	/* Must be called from the primary process. */
+	assert(rte_eal_process_type() == RTE_PROC_PRIMARY);
 	switch (event_type) {
 	case RTE_MEM_EVENT_FREE:
 		rte_rwlock_write_lock(&mlx5_shared_data->mem_event_rwlock);
-- 
2.11.0