netdev - Re: [PATCH net-next v14 05/12] selftests/vsock: add namespace helpers to vmtest.sh

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Message-ID: <aWZoXUGyoMjKCm2u@sgarzare-redhat>
Date: Tue, 13 Jan 2026 16:44:39 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Bobby Eshleman <bobbyeshleman@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Stefan Hajnoczi <stefanha@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, 
	Jason Wang <jasowang@...hat.com>, Eugenio Pérez <eperezma@...hat.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, "K. Y. Srinivasan" <kys@...rosoft.com>, 
	Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, 
	Bryan Tan <bryan-bt.tan@...adcom.com>, Vishnu Dasa <vishnu.dasa@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Shuah Khan <shuah@...nel.org>, Long Li <longli@...rosoft.com>, 
	linux-kernel@...r.kernel.org, virtualization@...ts.linux.dev, netdev@...r.kernel.org, 
	kvm@...r.kernel.org, linux-hyperv@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	berrange@...hat.com, Sargun Dhillon <sargun@...gun.me>, 
	Bobby Eshleman <bobbyeshleman@...a.com>
Subject: Re: [PATCH net-next v14 05/12] selftests/vsock: add namespace
 helpers to vmtest.sh

On Mon, Jan 12, 2026 at 07:11:14PM -0800, Bobby Eshleman wrote:
>From: Bobby Eshleman <bobbyeshleman@...a.com>
>
>Add functions for initializing namespaces with the different vsock NS
>modes. Callers can use add_namespaces() and del_namespaces() to create
>namespaces global0, global1, local0, and local1.
>
>The add_namespaces() function initializes global0, local0, etc... with
>their respective vsock NS mode by toggling child_ns_mode before creating
>the namespace.
>
>Remove namespaces upon exiting the program in cleanup(). This is
>unlikely to be needed for a healthy run, but it is useful for tests that
>are manually killed mid-test.
>
>This patch is in preparation for later namespace tests.
>
>Signed-off-by: Bobby Eshleman <bobbyeshleman@...a.com>
>---
>Changes in v13:
>- intialize namespaces to use the child_ns_mode mechanism
>- remove setting modes from init_namespaces() function (this function
>  only sets up the lo device now)
>- remove ns_set_mode(ns) because ns_mode is no longer mutable
>---
> tools/testing/selftests/vsock/vmtest.sh | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/tools/testing/selftests/vsock/vmtest.sh b/tools/testing/selftests/vsock/vmtest.sh
>index c7b270dd77a9..c2bdc293b94c 100755
>--- a/tools/testing/selftests/vsock/vmtest.sh
>+++ b/tools/testing/selftests/vsock/vmtest.sh
>@@ -49,6 +49,7 @@ readonly TEST_DESCS=(
> )
>
> readonly USE_SHARED_VM=(vm_server_host_client vm_client_host_server vm_loopback)
>+readonly NS_MODES=("local" "global")
>
> VERBOSE=0
>
>@@ -103,6 +104,36 @@ check_result() {
> 	fi
> }
>
>+add_namespaces() {
>+	local orig_mode
>+	orig_mode=$(cat /proc/sys/net/vsock/child_ns_mode)
>+
>+	for mode in "${NS_MODES[@]}"; do
>+		echo "${mode}" > /proc/sys/net/vsock/child_ns_mode
>+		ip netns add "${mode}0" 2>/dev/null
>+		ip netns add "${mode}1" 2>/dev/null
>+	done
>+
>+	echo "${orig_mode}" > /proc/sys/net/vsock/child_ns_mode
>+}
>+
>+init_namespaces() {
>+	for mode in "${NS_MODES[@]}"; do
>+		# we need lo for qemu port forwarding
>+		ip netns exec "${mode}0" ip link set dev lo up
>+		ip netns exec "${mode}1" ip link set dev lo up
>+	done
>+}
>+
>+del_namespaces() {
>+	for mode in "${NS_MODES[@]}"; do
>+		ip netns del "${mode}0" &>/dev/null
>+		ip netns del "${mode}1" &>/dev/null
>+		log_host "removed ns ${mode}0"
>+		log_host "removed ns ${mode}1"
>+	done
>+}
>+
> vm_ssh() {
> 	ssh -q -o UserKnownHostsFile=/dev/null -p ${SSH_HOST_PORT} localhost "$@"
> 	return $?
>@@ -110,6 +141,7 @@ vm_ssh() {
>
> cleanup() {
> 	terminate_pidfiles "${!PIDFILES[@]}"
>+	del_namespaces
> }
>
> check_args() {
>
>-- 
>2.47.3
>