Re: [PATCH v4 0/4] RDMA/rxe: Add the support that rxe can work in net namespace

[Zhu Yanjun <yanjun.zhu@linux.dev>]

在 2026/3/8 16:35, Zhu Yanjun 写道:
> Currently rxe does not work correctly in network namespaces.
>
> When the rdma_rxe module is loaded, a UDP socket listening on port
> 4791 is created in init_net. When users run:
>
>      ip link add ... type rxe
>
> inside another network namespace, the RXE RDMA link is created but it
> cannot function properly because the underlying UDP socket belongs to
> init_net. Other network namespaces cannot use that socket.
>
> To address this issue, this series introduces net namespace support
> for rxe and moves socket management to be per network namespace.
>
> The series first introduces per-net namespace management for the IPv4
> and IPv6 sockets used by rxe. The sockets are created when the network
> namespace becomes active and are released when the namespace is
> destroyed.
>
> Based on this infrastructure, rxe RDMA links are then created and
> destroyed within each network namespace. This ensures that both the
> UDP sockets and RDMA links are correctly scoped to the namespace in
> which they are used.
>
> With these changes, rxe RDMA links can be created and used both in
> init_net and in other network namespaces, and resources are properly
> cleaned up during namespace teardown.
>
> The series also includes a selftest to verify RXE functionality in
> network namespaces.

The selftest result is as below:

"
# make -C tools/testing/selftests/ TARGETS=rdma run_tests
make: Entering directory '/root/Development/linux/tools/testing/selftests'
make[1]: Nothing to be done for 'all'.
TAP version 13
1..4
# timeout set to 45
# selftests: rdma: rxe_rping_between_netns.sh
# server DISCONNECT EVENT...
# wait for RDMA_READ_ADV state 10
ok 1 selftests: rdma: rxe_rping_between_netns.sh
# timeout set to 45
# selftests: rdma: rxe_ipv6.sh
ok 2 selftests: rdma: rxe_ipv6.sh
# timeout set to 45
# selftests: rdma: rxe_socket_with_netns.sh
ok 3 selftests: rdma: rxe_socket_with_netns.sh
# timeout set to 45
# selftests: rdma: rxe_test_NETDEV_UNREGISTER.sh
ok 4 selftests: rdma: rxe_test_NETDEV_UNREGISTER.sh
make: Leaving directory '/root/Development/linux/tools/testing/selftests'
"

Zhu Yanjun

>
> V3 -> V4: Squash all the changes about rxe_ns.c/h into one commit.
> V2 -> V3: Fix build warnings
> V1 -> V2: Fix the problems based on David Ahern.
>
>
> Zhu Yanjun (4):
>    RDMA/nldev: Add dellink function pointer
>    RDMA/rxe: Add net namespace support for IPv4/IPv6 sockets
>    RDMA/rxe: Support RDMA link creation and destruction per net namespace
>    RDMA/rxe: Add testcase for net namespace rxe
>
>   MAINTAINERS                                   |   1 +
>   drivers/infiniband/core/nldev.c               |   6 +
>   drivers/infiniband/sw/rxe/Makefile            |   3 +-
>   drivers/infiniband/sw/rxe/rxe.c               |  38 ++++-
>   drivers/infiniband/sw/rxe/rxe_net.c           | 145 +++++++++++++-----
>   drivers/infiniband/sw/rxe/rxe_net.h           |   9 +-
>   drivers/infiniband/sw/rxe/rxe_ns.c            | 136 ++++++++++++++++
>   drivers/infiniband/sw/rxe/rxe_ns.h            |  17 ++
>   include/rdma/rdma_netlink.h                   |   2 +
>   tools/testing/selftests/Makefile              |   1 +
>   tools/testing/selftests/rdma/Makefile         |   7 +
>   tools/testing/selftests/rdma/config           |   3 +
>   tools/testing/selftests/rdma/rxe_ipv6.sh      |  47 ++++++
>   .../selftests/rdma/rxe_rping_between_netns.sh |  57 +++++++
>   .../selftests/rdma/rxe_socket_with_netns.sh   |  64 ++++++++
>   .../rdma/rxe_test_NETDEV_UNREGISTER.sh        |  38 +++++
>   16 files changed, 527 insertions(+), 47 deletions(-)
>   create mode 100644 drivers/infiniband/sw/rxe/rxe_ns.c
>   create mode 100644 drivers/infiniband/sw/rxe/rxe_ns.h
>   create mode 100644 tools/testing/selftests/rdma/Makefile
>   create mode 100644 tools/testing/selftests/rdma/config
>   create mode 100755 tools/testing/selftests/rdma/rxe_ipv6.sh
>   create mode 100755 tools/testing/selftests/rdma/rxe_rping_between_netns.sh
>   create mode 100755 tools/testing/selftests/rdma/rxe_socket_with_netns.sh
>   create mode 100755 tools/testing/selftests/rdma/rxe_test_NETDEV_UNREGISTER.sh
>
-- 
Best Regards,
Yanjun.Zhu