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Message-ID: <Z7ikpmXut900JqA1@mini-arch>
Date: Fri, 21 Feb 2025 08:07:02 -0800
From: Stanislav Fomichev <stfomichev@...il.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
pabeni@...hat.com, andrew+netdev@...n.ch, horms@...nel.org,
dxu@...uu.xyz, shuah@...nel.org, hawk@...nel.org, petrm@...dia.com,
willemb@...gle.com, jstancek@...hat.com,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net v2 2/2] selftests: drv-net: test XDP, HDS auto and
the ioctl path
On 02/20, Jakub Kicinski wrote:
> Test XDP and HDS interaction. While at it add a test for using the IOCTL,
> as that turned out to be the real culprit.
>
> Testing bnxt:
>
> # NETIF=eth0 ./ksft-net-drv/drivers/net/hds.py
> KTAP version 1
> 1..12
> ok 1 hds.get_hds
> ok 2 hds.get_hds_thresh
> ok 3 hds.set_hds_disable # SKIP disabling of HDS not supported by the device
> ok 4 hds.set_hds_enable
> ok 5 hds.set_hds_thresh_zero
> ok 6 hds.set_hds_thresh_max
> ok 7 hds.set_hds_thresh_gt
> ok 8 hds.set_xdp
> ok 9 hds.enabled_set_xdp
> ok 10 hds.ioctl
> ok 11 hds.ioctl_set_xdp
> ok 12 hds.ioctl_enabled_set_xdp
> # Totals: pass:11 fail:0 xfail:0 xpass:0 skip:1 error:0
>
> and netdevsim:
>
> # ./ksft-net-drv/drivers/net/hds.py
> KTAP version 1
> 1..12
> ok 1 hds.get_hds
> ok 2 hds.get_hds_thresh
> ok 3 hds.set_hds_disable
> ok 4 hds.set_hds_enable
> ok 5 hds.set_hds_thresh_zero
> ok 6 hds.set_hds_thresh_max
> ok 7 hds.set_hds_thresh_gt
> ok 8 hds.set_xdp
> ok 9 hds.enabled_set_xdp
> ok 10 hds.ioctl
> ok 11 hds.ioctl_set_xdp
> ok 12 hds.ioctl_enabled_set_xdp
> # Totals: pass:12 fail:0 xfail:0 xpass:0 skip:0 error:0
>
> Netdevsim needs a sane default for tx/rx ring size.
>
> ethtool 6.11 is needed for the --disable-netlink option.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Acked-by: Stanislav Fomichev <sdf@...ichev.me>
> ---
> Since this is targeting net there is no cfg.rpath(),
> I'll follow up once in net-next.
>
> v2:
> - add the ioctl tests
> - factor out some common logic
>
> CC: shuah@...nel.org
> CC: hawk@...nel.org
> CC: petrm@...dia.com
> CC: willemb@...gle.com
> CC: jstancek@...hat.com
> CC: linux-kselftest@...r.kernel.org
> ---
> tools/testing/selftests/net/lib/Makefile | 3 +
> drivers/net/netdevsim/ethtool.c | 2 +
> .../testing/selftests/net/lib/xdp_dummy.bpf.c | 13 ++
> tools/testing/selftests/drivers/net/hds.py | 145 +++++++++++++++++-
> 4 files changed, 160 insertions(+), 3 deletions(-)
> create mode 100644 tools/testing/selftests/net/lib/xdp_dummy.bpf.c
>
> diff --git a/tools/testing/selftests/net/lib/Makefile b/tools/testing/selftests/net/lib/Makefile
> index bc6b6762baf3..c22623b9a2a5 100644
> --- a/tools/testing/selftests/net/lib/Makefile
> +++ b/tools/testing/selftests/net/lib/Makefile
> @@ -9,7 +9,10 @@ TEST_FILES := ../../../../../Documentation/netlink/specs
> TEST_FILES += ../../../../net/ynl
>
> TEST_GEN_FILES += csum
> +TEST_GEN_FILES += $(patsubst %.c,%.o,$(wildcard *.bpf.c))
>
> TEST_INCLUDES := $(wildcard py/*.py sh/*.sh)
>
> include ../../lib.mk
> +
> +include ../bpf.mk
> diff --git a/drivers/net/netdevsim/ethtool.c b/drivers/net/netdevsim/ethtool.c
> index 5c80fbee7913..7ab358616e03 100644
> --- a/drivers/net/netdevsim/ethtool.c
> +++ b/drivers/net/netdevsim/ethtool.c
> @@ -184,9 +184,11 @@ static const struct ethtool_ops nsim_ethtool_ops = {
>
> static void nsim_ethtool_ring_init(struct netdevsim *ns)
> {
> + ns->ethtool.ring.rx_pending = 512;
> ns->ethtool.ring.rx_max_pending = 4096;
> ns->ethtool.ring.rx_jumbo_max_pending = 4096;
> ns->ethtool.ring.rx_mini_max_pending = 4096;
> + ns->ethtool.ring.tx_pending = 512;
> ns->ethtool.ring.tx_max_pending = 4096;
> }
>
> diff --git a/tools/testing/selftests/net/lib/xdp_dummy.bpf.c b/tools/testing/selftests/net/lib/xdp_dummy.bpf.c
> new file mode 100644
> index 000000000000..d988b2e0cee8
> --- /dev/null
> +++ b/tools/testing/selftests/net/lib/xdp_dummy.bpf.c
> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#define KBUILD_MODNAME "xdp_dummy"
> +#include <linux/bpf.h>
> +#include <bpf/bpf_helpers.h>
> +
> +SEC("xdp")
> +int xdp_dummy_prog(struct xdp_md *ctx)
> +{
> + return XDP_PASS;
> +}
> +
> +char _license[] SEC("license") = "GPL";
> diff --git a/tools/testing/selftests/drivers/net/hds.py b/tools/testing/selftests/drivers/net/hds.py
> index 394971b25c0b..90807b21a6eb 100755
> --- a/tools/testing/selftests/drivers/net/hds.py
> +++ b/tools/testing/selftests/drivers/net/hds.py
> @@ -2,17 +2,54 @@
> # SPDX-License-Identifier: GPL-2.0
>
> import errno
> +import os
> from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_raises, KsftSkipEx
> -from lib.py import EthtoolFamily, NlError
> +from lib.py import CmdExitFailure, EthtoolFamily, NlError
> from lib.py import NetDrvEnv
> +from lib.py import defer, ethtool, ip
>
> -def get_hds(cfg, netnl) -> None:
> +
> +def _get_hds_mode(cfg, netnl) -> str:
> try:
> rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
> except NlError as e:
> raise KsftSkipEx('ring-get not supported by device')
> if 'tcp-data-split' not in rings:
> raise KsftSkipEx('tcp-data-split not supported by device')
> + return rings['tcp-data-split']
> +
> +
> +def _xdp_onoff(cfg):
> + test_dir = os.path.dirname(os.path.realpath(__file__))
> + prog = test_dir + "/../../net/lib/xdp_dummy.bpf.o"
> + ip(f"link set dev %s xdp obj %s sec xdp" %
> + (cfg.ifname, prog))
> + ip(f"link set dev %s xdp off" % cfg.ifname)
nit: any reason you're not using {format} strings here?
ip(f"link set dev {cfg.ifname} xdp obj {prog} sec xdp")
ip(f"link set dev {cfg.ifname} xdp off")
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