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Wed, 05 Aug 2026 13:02:42 -0700 (PDT) Date: Wed, 5 Aug 2026 13:02:37 -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, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, bobbyeshleman@meta.com, linux-kselftest@vger.kernel.org Subject: Re: [PATCH net-next] selftests: drv-net: hw: reset HDS mode after netkit devmem tests Message-ID: References: <20260804151040.2755153-1-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: <20260804151040.2755153-1-kuba@kernel.org> On Tue, Aug 04, 2026 at 08:10:40AM -0700, Jakub Kicinski wrote: > HDS mode has confusing semantics. On GET kernel reports > effective mode. On SET kernel expects explicit config. > Effective mode on GET means that we know the current > state, but we don't know if it's a driver default > or user setting. This matter because driver default > can change automatically when e.g. XDP is attached. > Explicit user setting must not be lost. > > With that in mind, we can't restore the HDS setting > like we restore other NIC config. We should always > reset to default ("unknown"). > > This fixes an issue with tests running after the devmem > test not being able to attach XDP, e.g. > > Exception| File "./xdp_metadata.py", line 105, in test_xdp_rss_hash > [...] > Exception| net.lib.py.utils.CmdExitFailure: Command failed > Exception| CMD: ip link set dev ens9np0 xdpdrv pinned /sys/fs/bpf/xdp_metadata_test/xdp_rss_hash > Exception| EXIT: 2 > Exception| STDERR: Error: unable to install XDP to device using tcp-data-split. > not ok 1 xdp_metadata.test_xdp_rss_hash.tcp > > Signed-off-by: Jakub Kicinski > --- > CC: shuah@kernel.org > CC: hawk@kernel.org > CC: john.fastabend@gmail.com > CC: sdf@fomichev.me > CC: bobbyeshleman@meta.com > CC: linux-kselftest@vger.kernel.org > --- > tools/testing/selftests/drivers/net/hw/devmem_lib.py | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/drivers/net/hw/devmem_lib.py b/tools/testing/selftests/drivers/net/hw/devmem_lib.py > index 0921ff03eb81..4e6316c7de96 100644 > --- a/tools/testing/selftests/drivers/net/hw/devmem_lib.py > +++ b/tools/testing/selftests/drivers/net/hw/devmem_lib.py > @@ -37,14 +37,13 @@ from lib.py import (bkg, cmd, defer, ethtool, rand_port, wait_port_listen, > rings = ethnl.rings_get({'header': {'dev-index': cfg.ifindex}}) > orig_rx_rings = rings['rx'] > orig_hds_thresh = rings.get('hds-thresh', 0) > - orig_data_split = rings.get('tcp-data-split', 'unknown') > > ethnl.rings_set({'header': {'dev-index': cfg.ifindex}, > 'tcp-data-split': 'enabled', > 'hds-thresh': 0, > 'rx': min(64, orig_rx_rings)}) > defer(ethnl.rings_set, {'header': {'dev-index': cfg.ifindex}, > - 'tcp-data-split': orig_data_split, > + 'tcp-data-split': 'unknown', > 'hds-thresh': orig_hds_thresh, > 'rx': orig_rx_rings}) > > -- > 2.55.0 > Reviewed-by: Bobby Eshleman