Re: [PATCH net-next v5 5/5] selftests: net: Add two test cases for link netns

On 12/9/24 15:01, Xiao Liang wrote:
>  - Add test for creating link in another netns when a link of the same
>    name and ifindex exists in current netns.
>  - Add test for link netns atomicity - create link directly in target
>    netns, and no notifications should be generated in current netns.
> 
> Signed-off-by: Xiao Liang <[email protected]>
> ---
>  tools/testing/selftests/net/Makefile        |  1 +
>  tools/testing/selftests/net/netns-name.sh   | 10 ++++++
>  tools/testing/selftests/net/netns_atomic.py | 39 +++++++++++++++++++++
>  3 files changed, 50 insertions(+)
>  create mode 100755 tools/testing/selftests/net/netns_atomic.py
> 
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index cb2fc601de66..f9f7a765d645 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -34,6 +34,7 @@ TEST_PROGS += gre_gso.sh
>  TEST_PROGS += cmsg_so_mark.sh
>  TEST_PROGS += cmsg_time.sh cmsg_ipv6.sh
>  TEST_PROGS += netns-name.sh
> +TEST_PROGS += netns_atomic.py
>  TEST_PROGS += nl_netdev.py
>  TEST_PROGS += srv6_end_dt46_l3vpn_test.sh
>  TEST_PROGS += srv6_end_dt4_l3vpn_test.sh
> diff --git a/tools/testing/selftests/net/netns-name.sh b/tools/testing/selftests/net/netns-name.sh
> index 6974474c26f3..0be1905d1f2f 100755
> --- a/tools/testing/selftests/net/netns-name.sh
> +++ b/tools/testing/selftests/net/netns-name.sh
> @@ -78,6 +78,16 @@ ip -netns $NS link show dev $ALT_NAME 2> /dev/null &&
>      fail "Can still find alt-name after move"
>  ip -netns $test_ns link del $DEV || fail
>  
> +#
> +# Test no conflict of the same name/ifindex in different netns
> +#
> +ip -netns $NS link add name $DEV index 100 type dummy || fail
> +ip -netns $NS link add netns $test_ns name $DEV index 100 type dummy ||
> +    fail "Can create in netns without moving"
> +ip -netns $test_ns link show dev $DEV >> /dev/null || fail "Device not found"
> +ip -netns $NS link del $DEV || fail
> +ip -netns $test_ns link del $DEV || fail
> +
>  echo -ne "$(basename $0) \t\t\t\t"
>  if [ $RET_CODE -eq 0 ]; then
>      echo "[  OK  ]"
> diff --git a/tools/testing/selftests/net/netns_atomic.py b/tools/testing/selftests/net/netns_atomic.py
> new file mode 100755
> index 000000000000..d350a3fc0a91
> --- /dev/null
> +++ b/tools/testing/selftests/net/netns_atomic.py
> @@ -0,0 +1,39 @@
> +#!/usr/bin/env python3
> +# SPDX-License-Identifier: GPL-2.0
> +
> +import time
> +
> +from lib.py import ksft_run, ksft_exit, ksft_true
> +from lib.py import ip
> +from lib.py import NetNS, NetNSEnter
> +from lib.py import RtnlFamily
> +
> +
> +def test_event(ns1, ns2) -> None:
> +    with NetNSEnter(str(ns1)):
> +        rtnl = RtnlFamily()
> +
> +    rtnl.ntf_subscribe("rtnlgrp-link")
> +
> +    ip(f"netns set {ns1} 0", ns=str(ns2))
> +
> +    ip(f"link add netns {ns2} link-netnsid 0 dummy1 type dummy")
> +    ip(f"link add netns {ns2} dummy2 type dummy", ns=str(ns1))
> +
> +    ip("link del dummy1", ns=str(ns2))
> +    ip("link del dummy2", ns=str(ns2))
> +
> +    time.sleep(1)
> +    rtnl.check_ntf()
> +    ksft_true(rtnl.async_msg_queue.empty(),
> +              "Received unexpected link notification")

I think we need a much larger coverage here, possibly testing all the
update drivers and more 'netns', 'link-netnsid', 'peer netns'
permutations for the devices that allow them.

Thanks,

Paolo