selftests/net: Add hugepage kernel config dependency for zcrx

test_iou_zcrx_large_buf in drivers/net/hw/nk_qlease.py runs iou-zcrx
with rx_buf_len > page size, backed by a hugepage-mapped area. Thus

selftests/net: Add hugepage kernel config dependency for zcrx

test_iou_zcrx_large_buf in drivers/net/hw/nk_qlease.py runs iou-zcrx
with rx_buf_len > page size, backed by a hugepage-mapped area. Thus
add to the Kconfig.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260614102607.863838-5-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests/net: Add netkit io_uring ZC test for large rx_buf_len

Add test_iou_zcrx_large_buf, which runs iou-zcrx with rx_buf_len >
page size (-x 2) through a netkit-leased RX queue. The netkit ifind

selftests/net: Add netkit io_uring ZC test for large rx_buf_len

Add test_iou_zcrx_large_buf, which runs iou-zcrx with rx_buf_len >
page size (-x 2) through a netkit-leased RX queue. The netkit ifindex
is opaque to io_uring, but rx_page_size is honoured by the leased
physical qops via netif_mp_open_rxq()'s lease redirect.

Originally, I also added a BIG TCP variant on top, but dropped it
here as fbnic (and the QEMU fbnic model) has no BIG TCP support
to exercise it as this point.

Tested against the QEMU fbnic emulation. The new test exercises
the > page rx_buf_len path only when the leased NIC advertises
QCFG_RX_PAGE_SIZE; otherwise it skips.

For fbnic, I used Bjorn's patches locally [0]:

# ./nk_qlease.py
TAP version 13
1..5
ok 1 nk_qlease.test_iou_zcrx
ok 2 nk_qlease.test_iou_zcrx_large_buf
ok 3 nk_qlease.test_attrs
ok 4 nk_qlease.test_attach_xdp_with_mp
ok 5 nk_qlease.test_destroy
# Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0

Without those patches (aka not advertising QCFG_RX_PAGE_SIZE):

# ./nk_qlease.py
TAP version 13
1..5
ok 1 nk_qlease.test_iou_zcrx
ok 2 nk_qlease.test_iou_zcrx_large_buf # SKIP Large chunks are not supported -95
ok 3 nk_qlease.test_attrs
ok 4 nk_qlease.test_attach_xdp_with_mp
ok 5 nk_qlease.test_destroy
# Totals: pass:4 fail:0 xfail:0 xpass:0 skip:1 error:0

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://lore.kernel.org/netdev/20260522113225.241337-1-bjorn@kernel.org/ [0]
Link: https://patch.msgid.link/20260614102607.863838-4-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests/net: Use public NetDrvContEnv API in nk_qlease fixtures

Expose the netkit host ifname as a public attribute nk_host_ifname
(symmetric with the already-public nk_guest_ifname), rename _atta

selftests/net: Use public NetDrvContEnv API in nk_qlease fixtures

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 <daniel@iogearbox.net>
Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260614102607.863838-3-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests/net: Move netkit lease hw setup into per-test fixtures

The HW counterpart of nk_qlease.py was carrying its lease setup in main()
and stashing src_queue / nk_queue / nk_*_ifname on cfg, whi

selftests/net: Move netkit lease hw setup into per-test fixtures

The HW counterpart of nk_qlease.py was carrying its lease setup in main()
and stashing src_queue / nk_queue / nk_*_ifname on cfg, which had drawbacks
called out during the review at [0].

This is the deferred half of the cleanup that landed in commit e254ffb9502c
("selftests/net: Split netdevsim tests from HW tests in nk_qlease") which
was the SW counterpart of nk_qlease.py.

While at it, convert the open-coded "ip netns exec" prefixes in the test
bodies over to the ns= argument of cmd() / bkg().

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://lore.kernel.org/netdev/20260408162238.16709090@kernel.org/ [0]
Link: https://patch.msgid.link/20260614102607.863838-2-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

io_uring/zcrx: selftests: verify rx_buf_len for large chunks

Check the newly added rx_buf_len page_pool field for io_uring
in the existing large-chunks test after the receiver is up.

Signed-off-by:

io_uring/zcrx: selftests: verify rx_buf_len for large chunks

Check the newly added rx_buf_len page_pool field for io_uring
in the existing large-chunks test after the receiver is up.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Link: https://patch.msgid.link/20260612211709.1456966-4-dtatulea@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests/net: rename _nk_host_ifname to nk_host_ifname

Rename _nk_host_ifname to nk_host_ifname in NetDrvContEnv to make it
a public attribute, matching the nk_guest_ifname rename. Tests that
acces

selftests/net: rename _nk_host_ifname to nk_host_ifname

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 <weibunny@fb.com>
Link: https://patch.msgid.link/20260608233118.2694144-7-weibunny.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: iou-zcrx: defer listen() until after zcrx setup

The server binds the queues for zero-copy after listen(). If the client
does a connect() during this time it can fail with EHOSTUNREACH on

selftests: iou-zcrx: defer listen() until after zcrx setup

The server binds the queues for zero-copy after listen(). If the client
does a connect() during this time it can fail with EHOSTUNREACH on
a cold system. This was encountered with the mlx5 driver where binding
the .ndo_queue_start() is a slow operation during which no packets
can be exchanged.

This change moves listen() after queue binding, when the test server is
fully operational.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
Link: https://patch.msgid.link/20260611160341.3697227-2-dtatulea@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: add userns devmem RX test

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 nsen

selftests: drv-net: add userns devmem RX test

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 <bobbyeshleman@meta.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20260602-nl-prov-v2-2-ad721142c641@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: tso: add new tests for ip6tnl, ipip, and sit tunnels

Add new tunnel test cases for ip6tnl, ipip, and sit. ip6tnl supports
ipv[46] as inner l3 header, and the other two tunnels on

selftests: drv-net: tso: add new tests for ip6tnl, ipip, and sit tunnels

Add new tunnel test cases for ip6tnl, ipip, and sit. ip6tnl supports
ipv[46] as inner l3 header, and the other two tunnels only support a
single inner l3 type.

Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
Link: https://patch.msgid.link/20260529-tso-tunnels-v1-1-3771ee9eaaa9@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: add netkit devmem tests

Add nk_devmem.py with four tests for TCP devmem through a netkit device.

These tests are just duplicates of the original devmem tests, with some
adjusted

selftests: drv-net: add netkit devmem tests

Add nk_devmem.py with four tests for TCP devmem through a netkit device.

These tests are just duplicates of the original devmem tests, with some
adjusted parameters such as telling ncdevmem to avoid device setup
(since it only has access to netkit, not a phys device).

Each test uses NetDrvContEnv with primary_rx_redirect=True to set up the
BPF redirect program on the primary netkit interface, then calls a
shared run_*() helper which probes for devmem support and configures
the NIC (HDS, RSS, queue lease) before driving the test. NIC state is
restored per-test via defer() callbacks registered inside the helper.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-8-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: add primary_rx_redirect support to NetDrvContEnv

When sending from a namespace that has access to a netkit device with a
leased queue, the nk primary in the host namespace needs

selftests: drv-net: add primary_rx_redirect support to NetDrvContEnv

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 <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-7-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: refactor devmem command builders into lib module

Adding netkit-based devmem tests is a straight-forward copy of devmem
test commands plus some args for the nk cases, so this patc

selftests: drv-net: refactor devmem command builders into lib module

Adding netkit-based devmem tests is a straight-forward copy of devmem
test commands plus some args for the nk cases, so this patch breaks out
these command builders into helpers used by both.

Though we tried to avoid libraries to avoid increasing the barrier of
entry/complexity (see selftests/drivers/net/README.md, section "Avoid
libraries and frameworks"), factoring out these functions seemed like
the lesser of two evils in this case of using the same commands, just
with slightly different args per environment.

I experimented with just having all of the tests in the same file to
avoid having helpers in a library file, but because ksft_run() is
limited to a single call per file, and the new tests will require
different environments (NetDrvContEnv/NetDrvEpEnv), it would have been
necessary to have each test set up its own environment instead of
sharing one for the entire ksft_run() run. This came at the cost of
ballooning the test time (from under 5s to 30s on my test system), so to
strike a balance these tests were placed in separate files so they could
keep a shared environment across a single ksft_run() run shared across
all tests using the same env type (introduced in subsequent patches).

The helpers work transparently with both plain and netkit environments
by inspecting cfg for netkit-specific attributes (netns, nk_queue,
etc...).

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-6-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: make attr _nk_guest_ifname public

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

selftests: drv-net: make attr _nk_guest_ifname public

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 <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-5-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

selftests: drv-net: ncdevmem: add -n flag to skip NIC configuration

Add a -n (skip_config) flag that causes ncdevmem to skip NIC
configuration when operating as an RX server. When -n is passed,
ncde

selftests: drv-net: ncdevmem: add -n flag to skip NIC configuration

Add a -n (skip_config) flag that causes ncdevmem to skip NIC
configuration when operating as an RX server. When -n is passed,
ncdevmem skips configuring header split, RSS, and flow steering, as well
as their teardown on exit.

This allows ksft tests to pre-configure the NIC in the host namespace
before launching ncdevmem in the guest namespace. This is needed for
netkit devmem tests where the test harness namespace has direct access
to the NIC and the ncdevmem namespace does not.

Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com>
Link: https://patch.msgid.link/20260514-tcp-dm-netkit-v5-4-408c59b91e66@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...