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selftests: mptcp: join: allow changing ifaces nr per test

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By default, 4 network interfaces are created per subtest in a dedicated
net namespace. Each netns has a dedicated pair of v4 and v6 addresses.
Future tests will need more.

Simply always creating more network interfaces per test will increase
the execution time for all other tests, for no other benefits. So now it
is possible to change this number only when needed, by setting ifaces_nr
when calling 'reset' and 'init_shapers', e.g.

  ifaces_nr=8 reset "Subtest title"
  ifaces_nr=8 init_shapers

Note that it might also be interesting to decrease the default value to
2 to reduce the setup time, especially when a debug kernel config is
being used.

Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260508-net-next-mptcp-pm-inc-limits-v1-5-c84e3fdf9b6a@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matthieu Baerts (NGI0) 2026-05-08 17:40:50 +02:00 committed by Jakub Kicinski
parent e845e6397d
commit e1515a1a49
1 changed files with 3 additions and 2 deletions
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5
tools/testing/selftests/net/mptcp/mptcp_join.sh
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@ -63,6 +63,7 @@ unset fastclose
unset fullmesh
unset speed
unset bind_addr
unset ifaces_nr
unset join_syn_rej
unset join_csum_ns1
unset join_csum_ns2
@ -146,7 +147,7 @@ init_partial()
# ns1eth4 ns2eth4
local i
for i in $(seq 1 4); do
for i in $(seq 1 "${ifaces_nr:-4}"); do
ip link add ns1eth$i netns "$ns1" type veth peer name ns2eth$i netns "$ns2"
ip -net "$ns1" addr add 10.0.$i.1/24 dev ns1eth$i
ip -net "$ns1" addr add dead:beef:$i::1/64 dev ns1eth$i nodad
@ -165,7 +166,7 @@ init_partial()
init_shapers()
{
local i
for i in $(seq 1 4); do
for i in $(seq 1 "${ifaces_nr:-4}"); do
tc -n $ns1 qdisc add dev ns1eth$i root netem rate 20mbit delay 1ms
tc -n $ns2 qdisc add dev ns2eth$i root netem rate 20mbit delay 1ms
done