linux-kernel - [PATCH net-next 3/3] selftests: ncdevmem: add tx test with multiple IOVs

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Message-ID: <20250520203044.2689904-3-stfomichev@gmail.com>
Date: Tue, 20 May 2025 13:30:44 -0700
From: Stanislav Fomichev <stfomichev@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	viro@...iv.linux.org.uk,
	horms@...nel.org,
	andrew+netdev@...n.ch,
	shuah@...nel.org,
	sagi@...mberg.me,
	willemb@...gle.com,
	asml.silence@...il.com,
	almasrymina@...gle.com,
	stfomichev@...il.com,
	jdamato@...tly.com,
	kaiyuanz@...gle.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH net-next 3/3] selftests: ncdevmem: add tx test with multiple IOVs

Use prime 3 for length to make offset slowly drift away.

Signed-off-by: Stanislav Fomichev <stfomichev@...il.com>
---
 .../testing/selftests/drivers/net/hw/devmem.py  | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/drivers/net/hw/devmem.py b/tools/testing/selftests/drivers/net/hw/devmem.py
index 7fc686cf47a2..d7f6a76eb2b7 100755
--- a/tools/testing/selftests/drivers/net/hw/devmem.py
+++ b/tools/testing/selftests/drivers/net/hw/devmem.py
@@ -49,12 +49,27 @@ from lib.py import ksft_disruptive
     ksft_eq(socat.stdout.strip(), "hello\nworld")
 
 
+@...t_disruptive
+def check_tx_chunks(cfg) -> None:
+    cfg.require_ipver("6")
+    require_devmem(cfg)
+
+    port = rand_port()
+    listen_cmd = f"socat -U - TCP6-LISTEN:{port}"
+
+    with bkg(listen_cmd, exit_wait=True) as socat:
+        wait_port_listen(port)
+        cmd(f"echo -e \"hello\\nworld\"| {cfg.bin_remote} -f {cfg.ifname} -s {cfg.addr_v['6']} -p {port} -z 3", host=cfg.remote, shell=True)
+
+    ksft_eq(socat.stdout.strip(), "hello\nworld")
+
+
 def main() -> None:
     with NetDrvEpEnv(__file__) as cfg:
         cfg.bin_local = path.abspath(path.dirname(__file__) + "/ncdevmem")
         cfg.bin_remote = cfg.remote.deploy(cfg.bin_local)
 
-        ksft_run([check_rx, check_tx],
+        ksft_run([check_rx, check_tx, check_tx_chunks],
                  args=(cfg, ))
     ksft_exit()
 
-- 
2.49.0