Date:   Fri, 2 Oct 2020 10:26:04 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum_v2()

On Thu, Oct 1, 2020 at 10:34 PM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> I have a problem with the following code in ndo_start_xmit() of
> the r8169 driver. A user reported the WARN being triggered due
> to gso_size > 0 and gso_type = 0. The chip supports TSO(6).
> The driver is widely used, therefore I'd expect much more such
> reports if it should be a common problem. Not sure what's special.
> My primary question: Is it a valid use case that gso_size is
> greater than 0, and no SKB_GSO_ flag is set?
> Any hint would be appreciated.
>
>

Maybe this is not a TCP packet ? But in this case GSO should have taken place.

You might add a
pr_err_once("gso_type=%x\n", shinfo->gso_type);

>
> u32 mss = shinfo->gso_size;
>
>         if (mss) {



>                 if (shinfo->gso_type & SKB_GSO_TCPV4) {
>                         opts[0] |= TD1_GTSENV4;
>                 } else if (shinfo->gso_type & SKB_GSO_TCPV6) {
>                         if (skb_cow_head(skb, 0))
>                                 return false;
>
>                         tcp_v6_gso_csum_prep(skb);
>                         opts[0] |= TD1_GTSENV6;
>                 } else {
>                         WARN_ON_ONCE(1);
>                 }
>
>
>
>
> -------- Forwarded Message --------
> Subject: [Bug 209423] WARN_ON_ONCE() at rtl8169_tso_csum_v2()
> Date: Thu, 01 Oct 2020 19:19:24 +0000
> From: bugzilla-daemon@...zilla.kernel.org
> To: hkallweit1@...il.com
>
> https://bugzilla.kernel.org/show_bug.cgi?id=209423
>
> --- Comment #7 from Damian Wrobel (dwrobel@...elnet.rybnik.pl) ---
> Here it comes:
>
> [86678.377120] ------------[ cut here ]------------
> [86678.377155] gso_size = 1448, gso_type = 0x00000000
> [86678.377381] WARNING: CPU: 0 PID: 0 at
> drivers/net/ethernet/realtek/r8169_main.c:4095 rtl8169_start_xmit+0x489/0x800
> [r8169]
> [86678.377393] Modules linked in: tun nft_nat nft_masq nft_objref
> nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4
> nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject
> nft_ct nft_chain_nat ip_set_hash_net ip6table_nat ip6table_mangle ip6table_raw
> ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
> iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink
> ip6table_filter ip6_tables iptable_filter sunrpc vfat fat snd_hda_codec_realtek
> edac_mce_amd snd_hda_codec_generic snd_hda_codec_hdmi ledtrig_audio kvm_amd
> snd_hda_intel snd_intel_dspcfg ccp snd_hda_codec kvm snd_hda_core snd_hwdep
> snd_pcm hp_wmi snd_timer wmi_bmof sparse_keymap irqbypass snd sp5100_tco
> i2c_piix4 soundcore k10temp fam15h_power rfkill_gpio rfkill acpi_cpufreq
> ip_tables xfs amdgpu iommu_v2 gpu_sched i2c_algo_bit ttm drm_kms_helper cec drm
> crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ax88179_178a
> usbnet serio_raw r8169 mii
> [86678.377442]  wmi video
> [86678.377486] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.12-201.fc32.x86_64
> #1
> [86678.377495] Hardware name: HP HP t630 Thin Client/8158, BIOS M40 v01.12
> 02/04/2020
> [86678.377511] RIP: 0010:rtl8169_start_xmit+0x489/0x800 [r8169]
> [86678.377521] Code: 10 0f 85 43 01 00 00 80 3d bb 20 01 00 00 0f 85 16 fe ff
> ff 44 89 ee 48 c7 c7 b0 72 36 c0 c6 05 a4 20 01 00 01 e8 0d 33 d8 e1 <0f> 0b 44
> 8b 44 24 28 8b 74 24 2c 48 8b 8d c8 00 00 00 e9 e9 fd ff
> [86678.377533] RSP: 0018:ffffa8f280003c80 EFLAGS: 00010282
> [86678.377542] RAX: 0000000000000026 RBX: ffff8d331abc6000 RCX:
> 0000000000000000
> [86678.377551] RDX: ffff8d331b427060 RSI: ffff8d331b418d00 RDI:
> 0000000000000300
> [86678.377559] RBP: ffff8d32b5bb8200 R08: 00000000000003d0 R09:
> 000000000000000d
> [86678.377576] R10: 0000000000000730 R11: ffffa8f280003b15 R12:
> 00000000000001c0
> [86678.377596] R13: 00000000000005a8 R14: 0000000000000022 R15:
> 000000000000001c
> [86678.377606] FS:  0000000000000000(0000) GS:ffff8d331b400000(0000)
> knlGS:0000000000000000
> [86678.377617] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [86678.377624] CR2: 00007fa516f64520 CR3: 00000000b6de6000 CR4:
> 00000000001406f0
> [86678.377632] Call Trace:
> [86678.377641]  <IRQ>
> [86678.377657]  dev_hard_start_xmit+0x8d/0x1d0
> [86678.377676]  sch_direct_xmit+0xeb/0x2f0
> [86678.377687]  __dev_queue_xmit+0x710/0x8a0
> [86678.377713]  ? nf_confirm+0xcb/0xf0 [nf_conntrack]
> [86678.377725]  ? nf_hook_slow+0x3f/0xb0
> [86678.377735]  ip_finish_output2+0x2ad/0x560
> [86678.377746]  __netif_receive_skb_core+0x4f0/0xf40
> [86678.377758]  ? packet_rcv+0x44/0x490
> [86678.377770]  __netif_receive_skb_one_core+0x2d/0x70
> [86678.377779]  process_backlog+0x96/0x160
> [86678.377789]  net_rx_action+0x13c/0x3e0
> [86678.377804]  ? usbnet_bh+0x24/0x2b0 [usbnet]
> [86678.377815]  __do_softirq+0xd9/0x2c4
> [86678.377825]  asm_call_on_stack+0x12/0x20
> [86678.377835]  </IRQ>
> [86678.377845]  do_softirq_own_stack+0x39/0x50
> [86678.377855]  irq_exit_rcu+0xc2/0x100
> [86678.377865]  common_interrupt+0x75/0x140
> [86678.377875]  asm_common_interrupt+0x1e/0x40
> [86678.377885] RIP: 0010:cpuidle_enter_state+0xb6/0x3f0
> [86678.377894] Code: e0 ab 6b 5d e8 ab c4 7b ff 49 89 c7 0f 1f 44 00 00 31 ff
> e8 7c dd 7b ff 80 7c 24 0f 00 0f 85 d4 01 00 00 fb 66 0f 1f 44 00 00 <45> 85 e4
> 0f 88 e0 01 00 00 49 63 d4 4c 2b 7c 24 10 48 8d 04 52 48
> [86678.377907] RSP: 0018:ffffffffa3a03e58 EFLAGS: 00000246
> [86678.377915] RAX: ffff8d331b42a2c0 RBX: ffff8d3312f3e400 RCX:
> 000000000000001f
> [86678.377923] RDX: 0000000000000000 RSI: 00000000401ec2e2 RDI:
> 0000000000000000
> [86678.377931] RBP: ffffffffa3b78960 R08: 00004ed561df8e36 R09:
> 0000000000000006
> [86678.377939] R10: 000000000000001d R11: 000000000000000e R12:
> 0000000000000002
> [86678.377956] R13: ffff8d3312f3e400 R14: 0000000000000002 R15:
> 00004ed561df8e36
> [86678.377970]  ? cpuidle_enter_state+0xa4/0x3f0
> [86678.377980]  cpuidle_enter+0x29/0x40
> [86678.377990]  do_idle+0x1d5/0x2a0
> [86678.377999]  cpu_startup_entry+0x19/0x20
> [86678.378009]  start_kernel+0x7f4/0x804
> [86678.378022]  secondary_startup_64+0xb6/0xc0
> [86678.378032] ---[ end trace 263bcddb7119c953 ]---
>
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