Commit 27c512af authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

selftests: hw-net: toeplitz: make sure NICs have pure Toeplitz configured 



Make sure that the NIC under test is configured for pure Toeplitz
hashing, and no input key transform (no symmetric hashing).

Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20251121040259.3647749-3-kuba@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent f81171fe

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

+18 −11
Original line number Diff line number Diff line
@@ -17,6 +17,9 @@ from lib.py import cmd, bkg, rand_port, defer 
from lib.py import ksft_in

from lib.py import ksft_variants, KsftNamedVariant, KsftSkipEx, KsftFailEx



# "define" for the ID of the Toeplitz hash function

ETH_RSS_HASH_TOP = 1





def _check_rps_and_rfs_not_configured(cfg):

    """Verify that RPS is not already configured."""
@@ -34,16 +37,6 @@ def _check_rps_and_rfs_not_configured(cfg): 
            raise KsftSkipEx(f"RFS already configured {rfs_file}: {val}")





def _get_rss_key(cfg):

    """

    Read the RSS key from the device.

    Return a string in the traditional %02x:%02x:%02x:.. format.

    """



    rss = cfg.ethnl.rss_get({"header": {"dev-index": cfg.ifindex}})

    return ':'.join(f'{b:02x}' for b in rss["hkey"])





def _get_cpu_for_irq(irq):

    with open(f"/proc/irq/{irq}/smp_affinity_list", "r",

              encoding="utf-8") as fp:
@@ -153,8 +146,22 @@ def test(cfg, proto_flag, ipver, grp): 
    # Check that rxhash is enabled

    ksft_in("receive-hashing: on", cmd(f"ethtool -k {cfg.ifname}").stdout)



    rss = cfg.ethnl.rss_get({"header": {"dev-index": cfg.ifindex}})

    # Make sure NIC is configured to use Toeplitz hash, and no key xfrm.

    if rss.get('hfunc') != ETH_RSS_HASH_TOP or rss.get('input-xfrm'):

        cfg.ethnl.rss_set({"header": {"dev-index": cfg.ifindex},

                           "hfunc": ETH_RSS_HASH_TOP,

                           "input-xfrm": {}})

        defer(cfg.ethnl.rss_set, {"header": {"dev-index": cfg.ifindex},

                                  "hfunc": rss.get('hfunc'),

                                  "input-xfrm": rss.get('input-xfrm', {})

                                  })

        # Refresh in case changing hfunc changes things.

        rss = cfg.ethnl.rss_get({"header": {"dev-index": cfg.ifindex}})



    key = ':'.join(f'{b:02x}' for b in rss["hkey"])



    port = rand_port(socket.SOCK_DGRAM)

    key = _get_rss_key(cfg)



    toeplitz_path = cfg.test_dir / "toeplitz"

    rx_cmd = [