Date:   Tue, 16 Oct 2018 00:28:06 +0200
From:   Fabio Rossi <rossi.f@...ind.it>
To:     Eric Dumazet <edumazet@...gle.com>,
        Stephen Hemminger <stephen@...workplumber.org>
CC:     netdev <netdev@...r.kernel.org>
Subject: Re: Fw: [Bug 201423] New: eth0: hw csum failure



On 15 October 2018 17:41:47 CEST, Eric Dumazet <edumazet@...gle.com> wrote:
>On Mon, Oct 15, 2018 at 8:15 AM Stephen Hemminger
><stephen@...workplumber.org> wrote:
>>
>>
>>
>> Begin forwarded message:
>>
>> Date: Sun, 14 Oct 2018 10:42:48 +0000
>> From: bugzilla-daemon@...zilla.kernel.org
>> To: stephen@...workplumber.org
>> Subject: [Bug 201423] New: eth0: hw csum failure
>>
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=201423
>>
>>             Bug ID: 201423
>>            Summary: eth0: hw csum failure
>>            Product: Networking
>>            Version: 2.5
>>     Kernel Version: 4.19.0-rc7
>>           Hardware: Intel
>>                 OS: Linux
>>               Tree: Mainline
>>             Status: NEW
>>           Severity: normal
>>           Priority: P1
>>          Component: Other
>>           Assignee: stephen@...workplumber.org
>>           Reporter: rossi.f@...ind.it
>>         Regression: No
>>
>> I have a P6T DELUXE V2 motherboard and using the sky2 driver for the
>ethernet
>> ports. I get the following error message:
>>
>> [  433.727397] eth0: hw csum failure
>> [  433.727406] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.19.0-rc7
>#19
>> [  433.727406] Hardware name: System manufacturer System Product
>Name/P6T
>> DELUXE V2, BIOS 1202    12/22/2010
>> [  433.727407] Call Trace:
>> [  433.727409]  <IRQ>
>> [  433.727415]  dump_stack+0x46/0x5b
>> [  433.727419]  __skb_checksum_complete+0xb0/0xc0
>> [  433.727423]  tcp_v4_rcv+0x528/0xb60
>> [  433.727426]  ? ipt_do_table+0x2d0/0x400
>> [  433.727429]  ip_local_deliver_finish+0x5a/0x110
>> [  433.727430]  ip_local_deliver+0xe1/0xf0
>> [  433.727431]  ? ip_sublist_rcv_finish+0x60/0x60
>> [  433.727432]  ip_rcv+0xca/0xe0
>> [  433.727434]  ? ip_rcv_finish_core.isra.0+0x300/0x300
>> [  433.727436]  __netif_receive_skb_one_core+0x4b/0x70
>> [  433.727438]  netif_receive_skb_internal+0x4e/0x130
>> [  433.727439]  napi_gro_receive+0x6a/0x80
>> [  433.727442]  sky2_poll+0x707/0xd20
>> [  433.727446]  ? rcu_check_callbacks+0x1b4/0x900
>> [  433.727447]  net_rx_action+0x237/0x380
>> [  433.727449]  __do_softirq+0xdc/0x1e0
>> [  433.727452]  irq_exit+0xa9/0xb0
>> [  433.727453]  do_IRQ+0x45/0xc0
>> [  433.727455]  common_interrupt+0xf/0xf
>> [  433.727456]  </IRQ>
>> [  433.727459] RIP: 0010:cpuidle_enter_state+0x124/0x200
>> [  433.727461] Code: 53 60 89 c3 e8 dd 90 ad ff 65 8b 3d 96 58 a7 7e
>e8 d1 8f
>> ad ff 31 ff 49 89 c4 e8 27 99 ad ff fb 48 ba cf f7 53 e3 a5 9b c4 20
><4c> 89 e1
>> 4c 29 e9 48 89 c8 48 c1 f9 3f 48 f7 ea b8 ff ff ff 7f 48
>> [  433.727462] RSP: 0000:ffffc900000a3e98 EFLAGS: 00000282 ORIG_RAX:
>> ffffffffffffffde
>> [  433.727463] RAX: ffff880237b1f280 RBX: 0000000000000004 RCX:
>> 000000000000001f
>> [  433.727464] RDX: 20c49ba5e353f7cf RSI: 000000002fe419c1 RDI:
>> 0000000000000000
>> [  433.727465] RBP: ffff880237b263a0 R08: 0000000000000714 R09:
>> 000000650512105d
>> [  433.727465] R10: 00000000ffffffff R11: 0000000000000342 R12:
>> 00000064fc2a8b1c
>> [  433.727466] R13: 00000064fc25b35f R14: 0000000000000004 R15:
>> ffffffff8204af20
>> [  433.727468]  ? cpuidle_enter_state+0x119/0x200
>> [  433.727471]  do_idle+0x1bf/0x200
>> [  433.727473]  cpu_startup_entry+0x6a/0x70
>> [  433.727475]  start_secondary+0x17f/0x1c0
>> [  433.727476]  secondary_startup_64+0xa4/0xb0
>> [  441.662954] eth0: hw csum failure
>> [  441.662959] CPU: 4 PID: 4347 Comm: radeon_cs:0 Not tainted
>4.19.0-rc7 #19
>> [  441.662960] Hardware name: System manufacturer System Product
>Name/P6T
>> DELUXE V2, BIOS 1202    12/22/2010
>> [  441.662960] Call Trace:
>> [  441.662963]  <IRQ>
>> [  441.662968]  dump_stack+0x46/0x5b
>> [  441.662972]  __skb_checksum_complete+0xb0/0xc0
>> [  441.662975]  tcp_v4_rcv+0x528/0xb60
>> [  441.662979]  ? ipt_do_table+0x2d0/0x400
>> [  441.662981]  ip_local_deliver_finish+0x5a/0x110
>> [  441.662983]  ip_local_deliver+0xe1/0xf0
>> [  441.662985]  ? ip_sublist_rcv_finish+0x60/0x60
>> [  441.662986]  ip_rcv+0xca/0xe0
>> [  441.662988]  ? ip_rcv_finish_core.isra.0+0x300/0x300
>> [  441.662990]  __netif_receive_skb_one_core+0x4b/0x70
>> [  441.662993]  netif_receive_skb_internal+0x4e/0x130
>> [  441.662994]  napi_gro_receive+0x6a/0x80
>> [  441.662998]  sky2_poll+0x707/0xd20
>> [  441.663000]  net_rx_action+0x237/0x380
>> [  441.663002]  __do_softirq+0xdc/0x1e0
>> [  441.663005]  irq_exit+0xa9/0xb0
>> [  441.663007]  do_IRQ+0x45/0xc0
>> [  441.663009]  common_interrupt+0xf/0xf
>> [  441.663010]  </IRQ>
>> [  441.663012] RIP: 0010:merge+0x22/0xb0
>> [  441.663014] Code: c3 31 c0 c3 90 90 90 90 41 56 41 55 41 54 55 48
>89 d5 53
>> 48 89 cb 48 83 ec 18 65 48 8b 04 25 28 00 00 00 48 89 44 24 10 31 c0
><48> 85 c9
>> 74 70 48 85 d2 74 6b 49 89 fd 49 89 f6 49 89 e4 eb 14 48
>> [  441.663015] RSP: 0018:ffffc9000090b988 EFLAGS: 00000246 ORIG_RAX:
>> ffffffffffffffde
>> [  441.663017] RAX: 0000000000000000 RBX: ffff88021ab2d408 RCX:
>> ffff88021ab2d408
>> [  441.663018] RDX: ffff88021ab2d388 RSI: ffffffffa021c440 RDI:
>> 0000000000000000
>> [  441.663019] RBP: ffff88021ab2d388 R08: 0000000000005ecf R09:
>> 0000000000008500
>> [  441.663020] R10: ffffea000877ec00 R11: ffff880236803500 R12:
>> ffffffffa021c440
>> [  441.663021] R13: ffff88021ab2d448 R14: 0000000000000004 R15:
>> ffffc9000090b9e0
>> [  441.663048]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120
>[radeon]
>> [  441.663063]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120
>[radeon]
>> [  441.663065]  ? merge+0x57/0xb0
>> [  441.663080]  ? radeon_irq_kms_set_irq_n_enabled+0x120/0x120
>[radeon]
>> [  441.663082]  list_sort+0x8b/0x230
>> [  441.663094]  radeon_cs_parser_fini+0xdf/0x110 [radeon]
>> [  441.663110]  radeon_cs_ioctl+0x2a4/0x710 [radeon]
>> [  441.663113]  ? __switch_to_asm+0x34/0x70
>> [  441.663114]  ? __switch_to_asm+0x40/0x70
>> [  441.663130]  ? radeon_cs_parser_init+0x20/0x20 [radeon]
>> [  441.663141]  drm_ioctl_kernel+0xa3/0xe0 [drm]
>> [  441.663149]  drm_ioctl+0x2e2/0x380 [drm]
>> [  441.663164]  ? radeon_cs_parser_init+0x20/0x20 [radeon]
>> [  441.663168]  ? page_add_new_anon_rmap+0x42/0x70
>> [  441.663171]  do_vfs_ioctl+0x9a/0x600
>> [  441.663173]  ksys_ioctl+0x35/0x60
>> [  441.663175]  __x64_sys_ioctl+0x11/0x20
>> [  441.663177]  do_syscall_64+0x3d/0xf0
>> [  441.663179]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> [  441.663180] RIP: 0033:0x7f9377377f37
>> [  441.663182] Code: 00 00 00 75 0c 48 c7 c0 ff ff ff ff 48 83 c4 18
>c3 e8 ad
>> db 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 10 00 00 00 0f 05
><48> 3d 01
>> f0 ff ff 73 01 c3 48 8b 0d 21 4f 2c 00 f7 d8 64 89 01 48
>> [  441.663183] RSP: 002b:00007f92c3130d28 EFLAGS: 00000246 ORIG_RAX:
>> 0000000000000010
>> [  441.663185] RAX: ffffffffffffffda RBX: 0000564498327ec0 RCX:
>> 00007f9377377f37
>> [  441.663186] RDX: 0000564498337ec8 RSI: 00000000c0206466 RDI:
>> 0000000000000010
>> [  441.663186] RBP: 0000564498337ec8 R08: 0000000000000000 R09:
>> 0000000000000000
>> [  441.663187] R10: 0000000000000000 R11: 0000000000000246 R12:
>> 00000000c0206466
>> [  441.663188] R13: 0000000000000010 R14: 0000000000000000 R15:
>> 0000564497a38120
>> [  462.833418] eth0: hw csum failure
>> [  462.833428] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 4.19.0-rc7
>#19
>> [  462.833429] Hardware name: System manufacturer System Product
>Name/P6T
>> DELUXE V2, BIOS 1202    12/22/2010
>> [  462.833429] Call Trace:
>> [  462.833432]  <IRQ>
>> [  462.833438]  dump_stack+0x46/0x5b
>> [  462.833442]  __skb_checksum_complete+0xb0/0xc0
>> [  462.833446]  tcp_v4_rcv+0x528/0xb60
>> [  462.833449]  ? ipt_do_table+0x2d0/0x400
>> [  462.833452]  ip_local_deliver_finish+0x5a/0x110
>> [  462.833454]  ip_local_deliver+0xe1/0xf0
>> [  462.833455]  ? ip_sublist_rcv_finish+0x60/0x60
>> [  462.833457]  ip_rcv+0xca/0xe0
>> [  462.833459]  ? ip_rcv_finish_core.isra.0+0x300/0x300
>> [  462.833461]  __netif_receive_skb_one_core+0x4b/0x70
>> [  462.833464]  netif_receive_skb_internal+0x4e/0x130
>> [  462.833466]  napi_gro_receive+0x6a/0x80
>> [  462.833469]  sky2_poll+0x707/0xd20
>> [  462.833471]  net_rx_action+0x237/0x380
>> [  462.833474]  __do_softirq+0xdc/0x1e0
>> [  462.833477]  irq_exit+0xa9/0xb0
>> [  462.833479]  do_IRQ+0x45/0xc0
>> [  462.833481]  common_interrupt+0xf/0xf
>> [  462.833482]  </IRQ>
>> [  462.833486] RIP: 0010:cpuidle_enter_state+0x124/0x200
>> [  462.833488] Code: 53 60 89 c3 e8 dd 90 ad ff 65 8b 3d 96 58 a7 7e
>e8 d1 8f
>> ad ff 31 ff 49 89 c4 e8 27 99 ad ff fb 48 ba cf f7 53 e3 a5 9b c4 20
><4c> 89 e1
>> 4c 29 e9 48 89 c8 48 c1 f9 3f 48 f7 ea b8 ff ff ff 7f 48
>> [  462.833489] RSP: 0018:ffffc900000a3e98 EFLAGS: 00000282 ORIG_RAX:
>> ffffffffffffffde
>> [  462.833491] RAX: ffff880237b1f280 RBX: 0000000000000004 RCX:
>> 000000000000001f
>> [  462.833492] RDX: 20c49ba5e353f7cf RSI: 000000002fe419c1 RDI:
>> 0000000000000000
>> [  462.833493] RBP: ffff880237b263a0 R08: 0000000000000000 R09:
>> 0000000000000000
>> [  462.833494] R10: 00000000ffffffff R11: 0000000000000273 R12:
>> 0000006bc3052131
>> [  462.833495] R13: 0000006bc2f99f57 R14: 0000000000000004 R15:
>> ffffffff8204af20
>> [  462.833498]  ? cpuidle_enter_state+0x119/0x200
>> [  462.833503]  do_idle+0x1bf/0x200
>> [  462.833506]  cpu_startup_entry+0x6a/0x70
>> [  462.833510]  start_secondary+0x17f/0x1c0
>> [  462.833513]  secondary_startup_64+0xa4/0xb0
>>
>> Something is changed between 4.17.12 and 4.18, after bisecting the
>problem I
>> got the following first bad commit:
>>
>> commit 88078d98d1bb085d72af8437707279e203524fa5
>> Author: Eric Dumazet <edumazet@...gle.com>
>> Date:   Wed Apr 18 11:43:15 2018 -0700
>>
>>     net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends
>>
>>     After working on IP defragmentation lately, I found that some
>large
>>     packets defeat CHECKSUM_COMPLETE optimization because of NIC
>adding
>>     zero paddings on the last (small) fragment.
>>
>>     While removing the padding with pskb_trim_rcsum(), we set
>skb->ip_summed
>>     to CHECKSUM_NONE, forcing a full csum validation, even if all
>prior
>>     fragments had CHECKSUM_COMPLETE set.
>>
>>     We can instead compute the checksum of the part we are trimming,
>>     usually smaller than the part we keep.
>>
>>     Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>>     Signed-off-by: David S. Miller <davem@...emloft.net>
>>
>
>Thanks for bisecting !
>
>This commit is known to expose some NIC/driver bugs.
>
>Look at commit 12b03558cef6d655d0d394f5e98a6fd07c1f6c0f
>("net: sungem: fix rx checksum support")  for one driver needing a fix.
>
>I assume SKY2_HW_NEW_LE is not set on your NIC ?

here is the chip found on my motherboard so it seems that flag is not set 

# dmesg | grep sky2

[    0.545661] sky2: driver version 1.30 [    0.545781] sky2 0000:06:00.0: Yukon-2 EC Ultra chip revision 3 [    0.546067] sky2 0000:06:00.0 eth0: addr 00:24:8c:xx:xx:xx [    0.546188] sky2 0000:04:00.0: Yukon-2 EC Ultra chip revision 3 [    0.546484] sky2 0000:04:00.0 eth1: addr 00:24:8c:xx:xx:xx [   38.043074] sky2 0000:06:00.0 eth0: enabling interface [   39.842161] sky2 0000:06:00.0 eth0: Link is up at 100 Mbps, full duplex, flow control rx

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