netdev - Re: [PATCH net-next v7 5/6] selftest: tun: Add tests for virtio-net hashing

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Message-ID: <20250228062947.7864a59c@kernel.org>
Date: Fri, 28 Feb 2025 06:29:47 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Akihiko Odaki <akihiko.odaki@...nix.com>
Cc: Jonathan Corbet <corbet@....net>, Willem de Bruijn
 <willemdebruijn.kernel@...il.com>, Jason Wang <jasowang@...hat.com>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, Xuan Zhuo
 <xuanzhuo@...ux.alibaba.com>, Shuah Khan <shuah@...nel.org>,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 netdev@...r.kernel.org, kvm@...r.kernel.org,
 virtualization@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org,
 Yuri Benditovich <yuri.benditovich@...nix.com>, Andrew Melnychenko
 <andrew@...nix.com>, Stephen Hemminger <stephen@...workplumber.org>,
 gur.stavi@...wei.com, Lei Yang <leiyang@...hat.com>
Subject: Re: [PATCH net-next v7 5/6] selftest: tun: Add tests for virtio-net
 hashing

On Fri, 28 Feb 2025 16:58:51 +0900 Akihiko Odaki wrote:
> The added tests confirm tun can perform RSS and hash reporting, and
> reject invalid configurations for them.

The tests may benefit from using FIXTURE_VARIANT(), up to you.

The IPv4 tests fail reliably on a VM with a debug kernel
(kernel/configs/debug.config included in the config):

# 5.90 [+0.00] ok 14 tun_vnet_hash.unclassified
# 5.90 [+0.00] #  RUN           tun_vnet_hash.ipv4 ...
# 6.18 [+0.28] # tun.c:669:ipv4:Expected 0 (0) != tun_vnet_hash_check(self->source_fd, self->dest_fds, &packet, sizeof(packet), 0, VIRTIO_NET_HASH_REPORT_IPv4, 0x6e45d952) (0)
# 15.09 [+8.92] # ipv4: Test failed
# 15.10 [+0.00] #          FAIL  tun_vnet_hash.ipv4
# 15.10 [+0.00] not ok 15 tun_vnet_hash.ipv4
# 15.10 [+0.00] #  RUN           tun_vnet_hash.tcpv4 ...
# 15.36 [+0.26] # tun.c:689:tcpv4:Expected 0 (0) != tun_vnet_hash_check(self->source_fd, self->dest_fds, &packet, sizeof(packet), VIRTIO_NET_HDR_F_DATA_VALID, VIRTIO_NET_HASH_REPORT_TCPv4, 0xfb63539a) (0)
# 24.76 [+9.40] # tcpv4: Test failed
# 24.76 [+0.00] #          FAIL  tun_vnet_hash.tcpv4
# 24.76 [+0.00] not ok 16 tun_vnet_hash.tcpv4
# 24.77 [+0.00] #  RUN           tun_vnet_hash.udpv4 ...
# 25.05 [+0.28] # tun.c:710:udpv4:Expected 0 (0) != tun_vnet_hash_check(self->source_fd, self->dest_fds, &packet, sizeof(packet), VIRTIO_NET_HDR_F_DATA_VALID, VIRTIO_NET_HASH_REPORT_UDPv4, 0xfb63539a) (0)
# 32.11 [+7.06] # udpv4: Test failed
# 32.11 [+0.00] #          FAIL  tun_vnet_hash.udpv4
# 32.11 [+0.00] not ok 17 tun_vnet_hash.udpv4
-- 
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