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Wed, 09 Sep 2026 11:40:47 -0700 (PDT) Date: Wed, 9 Sep 2026 11:40:44 -0700 From: Bobby Eshleman To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, shuah@kernel.org, bobbyeshleman@meta.com, sdf@fomichev.me, leitao@debian.org, razor@blackwall.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH net-next] selftests: drv-net: devmem: set reuseaddr on the sender's source port Message-ID: References: <20260908183420.1369630-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260908183420.1369630-1-kuba@kernel.org> On Tue, Sep 08, 2026 at 11:34:20AM -0700, Jakub Kicinski wrote: > devmem.py fails on the HW runners with: > > CMD[remote]: dd if=/dev/zero bs=512 count=1 2>/dev/null | socat -b 512 \ > -u - TCP6:[fd00:2::1]:50051,bind=[fd00:2::2]:50051,nodelay > STDERR: socat[41018] W bind(5, {AF=10 [fd00:2::2]:50051}, 28): \ > Address already in use > > ncdevmem installs a 5-tuple flow rule which matches the source port, so > socat has to bind it explicitly. The port comes from rand_port(), which > checks availability on the DUT - but we bind on the remote... > That said the failure rate seems to high to be random collisions > (~2% per sub-test). It's probably TIME_WAIT sockets on the remote, > run_rx_hds() alone creates 12 of them. > > Set reuseaddr so a TIME_WAIT socket does not fail the bind. Collisions > with a live socket are still possible, we'll see if they are frequent > enough to care. > > Signed-off-by: Jakub Kicinski > --- > CC: shuah@kernel.org > CC: bobbyeshleman@meta.com > CC: sdf@fomichev.me > CC: leitao@debian.org > CC: razor@blackwall.org > CC: linux-kselftest@vger.kernel.org > --- > tools/testing/selftests/drivers/net/hw/devmem_lib.py | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/drivers/net/hw/devmem_lib.py b/tools/testing/selftests/drivers/net/hw/devmem_lib.py > index 3554954a6691..b6e52fa9dda5 100644 > --- a/tools/testing/selftests/drivers/net/hw/devmem_lib.py > +++ b/tools/testing/selftests/drivers/net/hw/devmem_lib.py > @@ -201,7 +201,7 @@ def ncdevmem_rx(cfg, port, verify=True, fail_on_linear=False, flow_steer=False, > else: > addr = cfg.baddr > > - suffix = f",bind={cfg.remote_baddr}:{port}" > + suffix = f",bind={cfg.remote_baddr}:{port},reuseaddr" > > buf = "" > if buf_size: > -- > 2.55.0 > Reviewed-by: Bobby Eshleman