linux-next.git/tools/testing/selftests/drivers/net/lib/py/env.py, branch master

selftests: drv-net: print device info at the start

2026-08-06T01:12:07+00:00

When a reviewer asks a developer to run an upstream test during code review, it's often ambiguous whether the test was actually run against a real device, or just against netdevsim. Print the driver name and ifname at the start of the test, e.g.: # Interface: enp0s13f0u1u4, driver: r8152 TAP version 13 1..1 ok 1 ... Reviewed-by: Simon Horman Link: https://patch.msgid.link/20260803211944.2166211-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests: drv-net: Test queue stall upon reconfig

2026-08-04T00:49:32+00:00

Add a reconfig_tx_stall test that detects the possibility of a TX stall after ring reconfiguration. The key observation is that drivers using netif_tx_start_all_queues() are prone to experiencing a stall when reconfiguration completes compared to drivers using netif_tx_wake_all_queues(). start_all_queues only clears DRV_XOFF, while wake_all_queues also calls __netif_schedule() to kick the qdisc. Without the kick, qdisc backlog present at reconfig time can stay stuck until a new trigger is issued. The test caps the TX ring at 64 entries so it fills quickly, then installs FQ on a target TX queue and sends UDP packets with SO_TXTIME scheduled in the future. With napi_defer_hard_irqs slowing completions, the small ring can fill when FQ releases the burst, leaving requeued qdisc backlog with no FQ timer to rescue it. A subsequent ring reconfig must wake the queues to drain the backlog. Simply starting the queues can leave it stuck. Some drivers lack backpressure on the TX path and may not be able to build up the qdisc backlog the test relies on. In that case report an expected failure (xfail) instead of a hard failure. Testing on some of the existing drivers: Driver-A does not have the bug, Driver-B has the bug, Driver-C had the bug but it is fixed now. Driver-A: ./drivers/net/ring_reconfig.py -t reconfig_tx_stall TAP version 13 1..1 Sent 1024 SO_TXTIME packets (+100ms) Backlog before reconfig: 1176378 bytes ok 1 ring_reconfig.reconfig_tx_stall Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 Driver-B: TAP version 13 1..1 Sent 128 SO_TXTIME packets (+100ms) Sent 128 SO_TXTIME packets (+200ms) Backlog before reconfig: 148372 bytes Check| At ./drivers/net/ring_reconfig.py, line 397, in reconfig_tx_stall: Check| ksft_eq(0, backlog, Check failed 0 != 148372 qdisc backlog stuck on queue 1 after ring .... not ok 1 ring_reconfig.reconfig_tx_stall Totals: pass:0 fail:1 xfail:0 xpass:0 skip:0 error:0 Driver-C: TAP version 13 1..1 Sent 128 SO_TXTIME packets (+100ms) Backlog before reconfig: 192278 bytes ok 1 ring_reconfig.reconfig_tx_stall Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 Signed-off-by: Mohsin Bashir Link: https://patch.msgid.link/20260731021543.1058526-1-mohsin.bashr@gmail.com Signed-off-by: Jakub Kicinski

selftests: drv-net: allow switching env IP version

2026-07-08T10:34:23+00:00

NetDrvEpEnv picks a single IP version at init time, preferring IPv6 when both are configured. Add NetDrvEpEnv.set_ipver() to reselect the IP version and recompute the derived address fields. Reviewed-by: Carolina Jubran Reviewed-by: Dragos Tatulea Signed-off-by: Nimrod Oren Link: https://patch.msgid.link/20260702062348.2123960-2-noren@nvidia.com Signed-off-by: Paolo Abeni

selftests/net: Use public NetDrvContEnv API in nk_qlease fixtures

2026-06-16T01:58:01+00:00

Expose the netkit host ifname as a public attribute nk_host_ifname (symmetric with the already-public nk_guest_ifname), rename _attach_bpf to a public attach_bpf, and add a public detach_bpf helper that encapsulates the tc-filter teardown bookkeeping. Switch the fixtures to this public API. No functional change and keeps pylint happy. Signed-off-by: Daniel Borkmann Reviewed-by: Bobby Eshleman Link: https://patch.msgid.link/20260614102607.863838-3-daniel@iogearbox.net Signed-off-by: Jakub Kicinski

selftests/net: psp: support PSP in NetDrvContEnv infrastructure

2026-06-13T01:31:33+00:00

Add infrastructure to support PSP tests across network namespaces using NetDrvContEnv with netkit pairs. This enables testing PSP device association, where a non-PSP-capable device (e.g. netkit) in a guest namespace is associated with a real PSP device in the host namespace, allowing the guest to perform PSP encryption/decryption through the host's PSP hardware. The topology is: Host NS: psp_dev_local <---> nk_host | | | | (netkit pair) | | Remote NS: psp_dev_peer Guest NS: nk_guest (responder) (PSP tests) env.py: - nk_guest_ifindex is queried after moving the device into the guest namespace, so tests can use it directly for dev-assoc psp.py: - PSP device lookup supports container environments where the PSP device is on the physical interface, not the test interface - Association helpers handle dev-assoc/dev-disassoc with defer-based cleanup to prevent state leaks on test assertion failures - main() tries NetDrvContEnv with primary_rx_redirect and falls back to NetDrvEpEnv, so existing tests continue to work without the container environment Signed-off-by: Wei Wang Link: https://patch.msgid.link/20260608233118.2694144-8-weibunny.kernel@gmail.com Signed-off-by: Jakub Kicinski

selftests/net: rename _nk_host_ifname to nk_host_ifname

2026-06-13T01:31:33+00:00

Rename _nk_host_ifname to nk_host_ifname in NetDrvContEnv to make it a public attribute, matching the nk_guest_ifname rename. Tests that access the host-side netkit interface name (e.g. for cleanup after deleting the netkit pair) no longer trigger pylint protected-access warnings. Signed-off-by: Wei Wang Link: https://patch.msgid.link/20260608233118.2694144-7-weibunny.kernel@gmail.com Signed-off-by: Jakub Kicinski

selftests/net: add _find_bpf_obj() to search hw/ for BPF objects

2026-06-13T01:31:33+00:00

Add _find_bpf_obj() helper to NetDrvContEnv that searches the test directory first, then falls back to the hw/ subdirectory. This allows tests outside drivers/net/hw/ (e.g. psp.py in drivers/net/) to find BPF objects built in the hw/ directory. Update _attach_bpf() and _attach_primary_rx_redirect_bpf() to use _find_bpf_obj() for BPF object discovery. Signed-off-by: Wei Wang Link: https://patch.msgid.link/20260608233118.2694144-6-weibunny.kernel@gmail.com Signed-off-by: Jakub Kicinski

selftests: drv-net: add userns devmem RX test

2026-06-06T01:10:31+00:00

Add userns_devmem.py, which mirrors nk_devmem.py but places the netkit guest in a netns whose owning user_ns is non-init. ncdevmem is ran there via nsenter so the bind-rx call is issued with creds that hold CAP_NET_ADMIN only in the child user_ns. Without the preceding GENL_UNS_ADMIN_PERM patch the test fails at bind-rx with EPERM, but with the patch the transfer completes and tests pass. Signed-off-by: Bobby Eshleman Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20260602-nl-prov-v2-2-ad721142c641@meta.com Signed-off-by: Jakub Kicinski

selftests: drv-net: add primary_rx_redirect support to NetDrvContEnv

2026-05-19T01:49:07+00:00

When sending from a namespace that has access to a netkit device with a leased queue, the nk primary in the host namespace needs to redirect its RX to the physical device. This patch adds that redirection bpf program and teaches the harness to install it. Add primary_rx_redirect=False parameter to NetDrvContEnv.__init__(). When enabled, _attach_primary_rx_redirect_bpf() attaches a new BPF TC program (nk_primary_rx_redirect.bpf.c) to the primary (host-side) netkit interface. The program redirects non-ICMPv6 IPv6 packets to the physical NIC via bpf_redirect_neigh(), with the physical ifindex configured via the .bss map. ICMPv6 is left on the host's netkit primary so IPv6 neighbor discovery still work locally. Extract _find_bss_map_id() from _attach_bpf() into a reusable helper so other BPF attachment methods can use it. Acked-by: Stanislav Fomichev Signed-off-by: Bobby Eshleman Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-7-408c59b91e66@meta.com Signed-off-by: Jakub Kicinski

selftests: drv-net: make attr _nk_guest_ifname public

2026-05-19T01:49:07+00:00

Subsequent patches will use the _nk_guest_ifname as a public attr for setting up devmem. Rename to nk_guest_ifname to avoid angering the linter about the '_' prefix being used for a non-private attr. Acked-by: Stanislav Fomichev Signed-off-by: Bobby Eshleman Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-5-408c59b91e66@meta.com Signed-off-by: Jakub Kicinski