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From: Jiawei Wang <>
Subject: [dpdk-stable] [PATCH 19.11] net/mlx5: free MR resource on device DMA unmap
Date: Mon, 23 Nov 2020 19:52:45 +0200
Message-ID: <> (raw)

[ upstream commit 992e6df3dafebf0625a59a51136a5e07a361000f ]

mlx5 PMD created the MR (Memory Region) resource on the
mlx5_dma_map call to make the memory available for DMA
operations. On the mlx5_dma_unmap call the MR resource
was not freed but inserted to MR Free list for further
garbage collection.
Actual MR resource destroying happened on device stop
call. That caused the runtime out of memory in case of
application performed multiple DMA map/unmap calls.

The fix immediately frees the MR resource on mlx5_dma_unmap
call not engaging the list.

Fixes: 989e999d9305 ("net/mlx5: support PCI device DMA map and unmap")

Signed-off-by: Jiawei Wang <>
 drivers/net/mlx5/mlx5_mr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
index 0d549b6..54a11bd 100644
--- a/drivers/net/mlx5/mlx5_mr.c
+++ b/drivers/net/mlx5/mlx5_mr.c
@@ -1408,7 +1408,7 @@ struct mr_update_mp_data {
 		return -1;
 	LIST_REMOVE(mr, mr);
-	LIST_INSERT_HEAD(&sh->mr.mr_free_list, mr, mr);
+	mr_free(mr);
 	DEBUG("port %u remove MR(%p) from list", dev->data->port_id,
 	      (void *)mr);

             reply	other threads:[~2020-11-23 17:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-23 17:52 Jiawei Wang [this message]
2020-11-24 11:06 ` Luca Boccassi
  -- strict thread matches above, loose matches on Subject: below --
2020-11-23 17:14 Jiawei Wang

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