net: devmem: ksft: add ipv4 support

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 <almasrymina@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Link: https://patch.msgid.link/20250523230524.1107879-5-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: mina

tools/testing/selftests/drivers/net/hw/devmem.py

@@ -21,30 +21,28 @@ def require_devmem(cfg):
 
 @ksft_disruptive
 def check_rx(cfg) -> None:
-    cfg.require_ipver("6")
     require_devmem(cfg)
 
     port = rand_port()
-    listen_cmd = f"{cfg.bin_local} -l -f {cfg.ifname} -s {cfg.addr_v['6']} -p {port}"
+    listen_cmd = f"{cfg.bin_local} -l -f {cfg.ifname} -s {cfg.addr} -p {port}"
 
-    with bkg(listen_cmd) as socat:
+    with bkg(listen_cmd) as ncdevmem:
         wait_port_listen(port)
-        cmd(f"echo -e \"hello\\nworld\"| socat -u - TCP6:[{cfg.addr_v['6']}]:{port}", host=cfg.remote, shell=True)
+        cmd(f"echo -e \"hello\\nworld\"| socat -u - TCP{cfg.addr_ipver}:{cfg.addr}:{port}", host=cfg.remote, shell=True)
 
-    ksft_eq(socat.stdout.strip(), "hello\nworld")
+    ksft_eq(ncdevmem.stdout.strip(), "hello\nworld")
 
 
 @ksft_disruptive
 def check_tx(cfg) -> None:
-    cfg.require_ipver("6")
     require_devmem(cfg)
 
     port = rand_port()
-    listen_cmd = f"socat -U - TCP6-LISTEN:{port}"
+    listen_cmd = f"socat -U - TCP{cfg.addr_ipver}-LISTEN:{port}"
 
-    with bkg(listen_cmd, exit_wait=True) as socat:
+    with bkg(listen_cmd) 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}", host=cfg.remote, shell=True)
+        cmd(f"echo -e \"hello\\nworld\"| {cfg.bin_remote} -f {cfg.ifname} -s {cfg.addr} -p {port}", host=cfg.remote, shell=True)
 
     ksft_eq(socat.stdout.strip(), "hello\nworld")