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Fri, 06 Nov 2026 10:34:34 -0800 (PST) Received: from localhost ([2620:10d:c091:500::5:81c8]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91ea6900b00sm26542996d6.4.2026.11.06.10.34.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 06 Nov 2026 10:34:34 -0800 (PST) X-Mailing-List: bpf@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Fri, 06 Nov 2026 13:34:33 -0500 Message-Id: Cc: "Simon Horman" , "Jakub Sitnicki" , "Daniel Zahka" , "Willem de Bruijn" , , , , Subject: Re: [PATCH net v3 2/2] selftests/net: psp: test bidirectional data transfer From: "Daniel Zahka" To: "Wei Wang" , "David S . Miller" , "Jakub Kicinski" , "Paolo Abeni" , "Andrew Lunn" , "Shuah Khan" X-Mailer: aerc 0.21.0-threadmapfix References: <20261106182007.374660-1-weiwan@google.com> <20261106182007.374660-3-weiwan@google.com> In-Reply-To: <20261106182007.374660-3-weiwan@google.com> On Fri Nov 6, 2026 at 1:20 PM EST, Wei Wang wrote: > _data_basic_send() and _data_basic_send_netkit_psp_assoc() currently > only verify unidirectional data transmission from the test socket to > psp_responder. As a result, they do not exercise the receive path for > PSP-encrypted TCP data segments arriving at the test socket (such as > packets redirected across a netkit interface associated via dev-assoc, > which relies on SKB_EXT_PSP surviving packet scrubbing). > > Use the existing "data echo" command in psp_responder to verify that the > test socket can also receive PSP-encrypted data from the peer in both > _data_basic_send() and _data_basic_send_netkit_psp_assoc(). > > Signed-off-by: Wei Wang Reviewed-by: Daniel Zahka > --- > tools/testing/selftests/drivers/net/psp.py | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/tools/testing/selftests/drivers/net/psp.py b/tools/testing/s= elftests/drivers/net/psp.py > index 473500901879..c114d2245135 100755 > --- a/tools/testing/selftests/drivers/net/psp.py > +++ b/tools/testing/selftests/drivers/net/psp.py > @@ -120,6 +120,26 @@ def _check_data_rx(cfg, exp_len): > ksft_eq(read_len, exp_len) > =20 > =20 > +def _recv_careful(s, target, timeout=3D2): > + """Read exactly target bytes, tolerating short reads""" > + data =3D b'' > + end =3D time.monotonic() + timeout > + while time.monotonic() < end: > + try: > + data +=3D s.recv(target - len(data), socket.MSG_DONTWAIT) > + if len(data) =3D=3D target: > + return data > + except BlockingIOError: > + time.sleep(0.001) > + raise KsftFailEx(f"short read, got {len(data)} of {target} bytes") > + > + > +def _req_echo(cfg, s): > + """Ask the peer to echo, and check the reply arrives intact""" > + _send_with_ack(cfg, b'data echo\0') > + ksft_eq(_recv_careful(s, 5), b'echo\0') > + > + > def _check_data_outq(s, exp_len, force_wait=3DFalse): > outq =3D 0 > for _ in range(10): > @@ -478,6 +498,7 @@ def _data_basic_send(cfg, version, ipver): > =20 > data_len =3D _send_careful(cfg, s, 100) > _check_data_rx(cfg, data_len) > + _req_echo(cfg, s) > _close_psp_conn(cfg, s) > =20 > =20 > @@ -726,6 +747,7 @@ def _data_basic_send_netkit_psp_assoc(cfg, version, i= pver): > =20 > data_len =3D _send_careful(cfg, sock, 100) > _check_data_rx(cfg, data_len) > + _req_echo(cfg, sock) > _close_psp_conn(cfg, sock) > =20 > =20