path: root/doc/guides/nics
diff options
authorYongseok Koh <>2019-04-01 14:17:53 -0700
committerFerruh Yigit <>2019-04-05 17:45:22 +0200
commit207fe7ac72ad4a136a68fb979b7b7525161e4235 (patch)
tree5c9cdffc1438b1c17af8ce85dd586d164a83a05e /doc/guides/nics
parent3d1f3c7c8343b43bbb78368cfca7f329b54a19f0 (diff)
net/mlx5: fix external memory registration
Secondary process is not allowed to register MR due to a restriction of library and kernel driver. Fixes: 7e43a32ee060 ("net/mlx5: support externally allocated static memory") Cc: Signed-off-by: Yongseok Koh <> Acked-by: Shahaf Shuler <>
Diffstat (limited to 'doc/guides/nics')
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index f4db921..fa9bf73 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -86,6 +86,11 @@ Limitations
- Forked secondary process not supported.
- All mempools must be initialized before rte_eth_dev_start().
+ - External memory unregistered in EAL memseg list cannot be used for DMA
+ unless such memory has been registered by ``mlx5_mr_update_ext_mp()`` in
+ primary process and remapped to the same virtual address in secondary
+ process. If the external memory is registered by primary process but has
+ different virtual address in secondary process, unexpected error may happen.
- Flow pattern without any specific vlan will match for vlan packets as well: