kernel/tools/testing/selftests/drivers/net/hw/devmem.py, branch master

selftests: drv-net: add HDS payload sweep test for devmem TCP

2026-02-17T09:40:14Z

Add check_rx_hds test that verifies header/data split works across payload sizes. The test sweeps payload sizes from 1 byte to 8KB, if any data propagates up to userspace as SCM_DEVMEM_LINEAR, then the test fails. This shows that regardless of payload size, ncdevmem's configuration of hds-thresh to 0 is respected. Add -L (--fail-on-linear) flag to ncdevmem that causes the receiver to fail if any SCM_DEVMEM_LINEAR cmsg is received. Use socat option for fixed block sizing and tcp nodelay to disable nagle's algo to avoid buffering. Signed-off-by: Bobby Eshleman Link: https://patch.msgid.link/20260211-fbnic-tcp-hds-fixes-v1-4-55d050e6f606@meta.com Signed-off-by: Paolo Abeni

selftests: drv-net: devmem: flip the direction of Tx tests

2025-08-13T01:27:43Z

The Device Under Test should always be the local system. While the Rx test gets this right the Tx test is sending from remote to local. So Tx of DMABUF memory happens on remote. These tests never run in NIPA since we don't have a compatible device so we haven't caught this. Reviewed-by: Joe Damato Reviewed-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250811231334.561137-6-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests: drv-net: devmem: add / correct the IPv6 support

2025-08-13T01:27:42Z

We need to use bracketed IPv6 addresses for socat. Reviewed-by: Joe Damato Reviewed-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250811231334.561137-4-kuba@kernel.org Signed-off-by: Jakub Kicinski

selftests: devmem: add ipv4 support to chunks test

2025-06-18T01:00:27Z

Add ipv4 support to the recently added chunks tests, which was added as ipv6 only. Signed-off-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250615203511.591438-3-almasrymina@google.com Signed-off-by: Jakub Kicinski

net: devmem: ksft: upgrade rx test to send 1K data

2025-05-28T02:19:36Z

The current test just sends "hello\nworld" and verifies that is the string received on the RX side. That is fine, but improve the test a bit by sending 1K data. The test should be improved further to send more data, but for now this should be a welcome improvement. The test will send a repeating pattern of 0x01, 0x02, ... 0x06. The ncdevmem `-v 7` flag will verify this pattern. ncdevmem will provide useful debugging info when the test fails, such as the frags received and verified fine, and which frag exactly failed, what was the expected byte pattern, and what is the actual byte pattern received. All this debug information will be useful when the test fails. Signed-off-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250523230524.1107879-8-almasrymina@google.com Signed-off-by: Jakub Kicinski

net: devmem: ksft: add 5 tuple FS support

2025-05-28T02:19:36Z

ncdevmem supports drivers that are limited to either 3-tuple or 5-tuple FS support, but the ksft is currently 3-tuple only. Support drivers that have 5-tuple FS supported by adding a ksft arg. Signed-off-by: Mina Almasry fix 5-tuple fix 5-tuple Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250523230524.1107879-7-almasrymina@google.com Signed-off-by: Jakub Kicinski

net: devmem: ksft: add exit_wait to make rx test pass

2025-05-28T02:19:35Z

This exit_wait seems necessary to make the rx side test pass for me. I think this is just missed from the original test add patch. Add it now. Signed-off-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250523230524.1107879-6-almasrymina@google.com Signed-off-by: Jakub Kicinski

net: devmem: ksft: add ipv4 support

2025-05-28T02:19:35Z

ncdevmem supports both ipv4 and ipv6, but the ksft is currently ipv6-only. Propagate the ipv4 support to the ksft, so that folks that are limited to these networks can also test. Signed-off-by: Mina Almasry Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250523230524.1107879-5-almasrymina@google.com Signed-off-by: Jakub Kicinski

selftests: ncdevmem: add tx test with multiple IOVs

2025-05-26T09:00:48Z

Use prime 3 for length to make offset slowly drift away. Signed-off-by: Stanislav Fomichev Acked-by: Mina Almasry Signed-off-by: David S. Miller

selftests: ncdevmem: Implement devmem TCP TX

2025-05-13T09:12:49Z

Add support for devmem TX in ncdevmem. This is a combination of the ncdevmem from the devmem TCP series RFCv1 which included the TX path, and work by Stan to include the netlink API and refactored on top of his generic memory_provider support. Signed-off-by: Mina Almasry Signed-off-by: Stanislav Fomichev Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20250508004830.4100853-10-almasrymina@google.com Signed-off-by: Paolo Abeni