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Message-ID: <469a6ab2edf1486ea5013091c258710c@bgmail102.nvidia.com>
Date: Fri, 1 Dec 2017 15:39:23 +0000
From: Bhadram Varka <vbhadram@...dia.com>
To: Giuseppe CAVALLARO <peppe.cavallaro@...com>,
"Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>
CC: linux-netdev <netdev@...r.kernel.org>
Subject: RE: NETDEV WATCHDOG: eth0 (dwc-eth-dwmac): transmit queue 1 timed out
Hi Giuseppe,
I don't see any issue with if we execute "ping -s 1400" case. I believe in this case TSO not triggered.
Thanks,
Bhadram.
-----Original Message-----
From: Giuseppe CAVALLARO [mailto:peppe.cavallaro@...com]
Sent: Thursday, November 23, 2017 11:58 AM
To: Bhadram Varka <vbhadram@...dia.com>; Joao.Pinto@...opsys.com
Cc: linux-netdev <netdev@...r.kernel.org>
Subject: Re: NETDEV WATCHDOG: eth0 (dwc-eth-dwmac): transmit queue 1 timed out
Hi Bhadram
you said that In normal ping scenario this is not observed, I wonder if you could try for example, ping with -s 1400. In that case, if still fail I think the issue could be the FIFO tuning and I expect overflow on RX MMC counters.
Let me know
Regards,
Peppe
On 11/20/2017 3:22 PM, Bhadram Varka wrote:
> Hi Giuseppe,
>
> Thanks for responding.
>
> Actually I am using net-next tree for making the changes. Below patches already present in code base.
>
> a0daae1 net: stmmac: Disable flow ctrl for RX AVB queues and really
> enable TX AVB queues
> 52a7623 net: stmmac: Use correct values in TQS/RQS fields
>
> Thanks,
> Bhadram.
>
> -----Original Message-----
> From: Giuseppe CAVALLARO [mailto:peppe.cavallaro@...com]
> Sent: Monday, November 20, 2017 6:37 PM
> To: Bhadram Varka <vbhadram@...dia.com>; Joao.Pinto@...opsys.com
> Cc: linux-netdev <netdev@...r.kernel.org>
> Subject: Re: NETDEV WATCHDOG: eth0 (dwc-eth-dwmac): transmit queue 1
> timed out
>
> Hello Bhadram
>
> there are some new patches actually in net/net-next repo that you should have; for example:
>
> [PATCH net-next v2 0/2] net: stmmac: Improvements for
> multi-queuing and for AVB
>
> Let me know if these help you.
>
> Regards
> Peppe
>
> On 11/20/2017 7:38 AM, Bhadram Varka wrote:
>> Hi Joao/Peppe,
>>
>> Observed this issue more frequently with multi-channel case. Am I missing something in DT ?
>> Please help here to understand the issue.
>>
>> Thanks,
>> Bhadram
>>
>> -----Original Message-----
>> From: Bhadram Varka
>> Sent: Thursday, November 16, 2017 9:41 AM
>> To: linux-netdev <netdev@...r.kernel.org>
>> Subject: NETDEV WATCHDOG: eth0 (dwc-eth-dwmac): transmit queue 1
>> timed out
>>
>> Hi,
>>
>> I am trying to enable multi-queue in Tegra186 EQOS (which has support for 4 channels). Observed below netdev watchdog warning. Its easily reproable with iperf test.
>> In normal ping scenario this is not observed. I did not observe any issue if we disable TSO. Looks like issue in stmmac_tso_xmit() in multi-channel scenario.
>>
>> [ 88.801672] NETDEV WATCHDOG: eth0 (dwc-eth-dwmac): transmit queue 0 timed out
>> [ 88.808818] ------------[ cut here ]------------
>> [ 88.813435] WARNING: CPU: 5 PID: 0 at net/sched/sch_generic.c:320 dev_watchdog+0x2cc/0x2d8
>> [ 88.821681] Modules linked in: dwmac_dwc_qos_eth stmmac_platform crc32_ce crct10dif_ce stmmac ip_tables x_tables ipv6
>> [ 88.832290] CPU: 5 PID: 0 Comm: swapper/5 Tainted: G S 4.14.0-rc7-01956-g9395db5-dirty #21
>> [ 88.841663] Hardware name: NVIDIA Tegra186 P2771-0000 Development Board (DT)
>> [ 88.848697] task: ffff8001ec8fd400 task.stack: ffff000009e38000
>> [ 88.854606] PC is at dev_watchdog+0x2cc/0x2d8
>> [ 88.858952] LR is at dev_watchdog+0x2cc/0x2d8
>> [ 88.863300] pc : [<ffff00000894a76c>] lr : [<ffff00000894a76c>] pstate: 20000145
>> [ 88.870678] sp : ffff00000802bd80
>> [ 88.873983] x29: ffff00000802bd80 x28: 00000000000000a0
>> [ 88.879287] x27: 00000000ffffffff x26: ffff8001eae2c3b0
>> [ 88.884589] x25: 0000000000000005 x24: ffff8001ecb6be80
>> [ 88.889891] x23: ffff8001eae2c39c x22: ffff8001eae2bfb0
>> [ 88.895192] x21: ffff8001eae2c000 x20: ffff000008fe7000
>> [ 88.900493] x19: 0000000000000001 x18: 0000000000000010
>> [ 88.905795] x17: 0000000000000000 x16: 0000000000000000
>> [ 88.911098] x15: ffffffffffffffff x14: 756f2064656d6974
>> [ 88.916399] x13: 2031206575657571 x12: ffff000008fe9df0
>> [ 88.921699] x11: ffff000008586180 x10: 642d6874652d6377
>> [ 88.927000] x9 : 0000000000000016 x8 : 3a474f4448435441
>> [ 88.932301] x7 : 572056454454454e x6 : 000000000000014f
>> [ 88.937602] x5 : 0000000000000020 x4 : 0000000000000000
>> [ 88.942902] x3 : 0000000000000000 x2 : ffff000008fec4c0
>> [ 88.948203] x1 : ffff8001ec8fd400 x0 : 0000000000000041
>> [ 88.953504] Call trace:
>> [ 88.955944] Exception stack(0xffff00000802bc40 to 0xffff00000802bd80)
>> [ 88.962371] bc40: 0000000000000041 ffff8001ec8fd400 ffff000008fec4c0 0000000000000000
>> [ 88.970184] bc60: 0000000000000000 0000000000000020 000000000000014f 572056454454454e
>> [ 88.977998] bc80: 3a474f4448435441 0000000000000016 642d6874652d6377 ffff000008586180
>> [ 88.985811] bca0: ffff000008fe9df0 2031206575657571 756f2064656d6974 ffffffffffffffff
>> [ 88.993624] bcc0: 0000000000000000 0000000000000000 0000000000000010 0000000000000001
>> [ 89.001439] bce0: ffff000008fe7000 ffff8001eae2c000 ffff8001eae2bfb0 ffff8001eae2c39c
>> [ 89.009252] bd00: ffff8001ecb6be80 0000000000000005 ffff8001eae2c3b0 00000000ffffffff
>> [ 89.017065] bd20: 00000000000000a0 ffff00000802bd80 ffff00000894a76c ffff00000802bd80
>> [ 89.024879] bd40: ffff00000894a76c 0000000020000145 ffff000000b67570 0000000000000001
>> [ 89.032693] bd60: 0001000000000000 ffff8001ecb6b200 ffff00000802bd80 ffff00000894a76c
>> [ 89.040508] [<ffff00000894a76c>] dev_watchdog+0x2cc/0x2d8
>> [ 89.045900] [<ffff000008130d1c>] call_timer_fn.isra.5+0x24/0x80
>> [ 89.051809] [<ffff000008130e1c>] expire_timers+0xa4/0xb0
>> [ 89.057111] [<ffff000008130f68>] run_timer_softirq+0x140/0x170
>> [ 89.062933] [<ffff00000808196c>] __do_softirq+0x12c/0x228
>> [ 89.068323] [<ffff0000080ce180>] irq_exit+0xd0/0x108
>> [ 89.073278] [<ffff00000811a180>] __handle_domain_irq+0x60/0xb8
>> [ 89.079098] [<ffff000008081670>] gic_handle_irq+0x58/0xa8
>> [ 89.084484] Exception stack(0xffff000009e3be20 to 0xffff000009e3bf60)
>> [ 89.090910] be20: 0000000000000000 0000000000000000 0000000000000001 0000000000000000
>> [ 89.098724] be40: 0000000000000000 ffff000009e3bf60 00008001ecffd000 0000000000000001
>> [ 89.106537] be60: 0000000000000002 ffff000009e3bee0 0000000000000a00 0000000000000000
>> [ 89.114351] be80: 0000000000000001 0000000000000000 001c3dfbd9959589 00001daf5b7a4860
>> [ 89.122164] bea0: ffff00000825b000 0000000000000000 0000ffffc0311284 ffff000008fc5000
>> [ 89.129978] bec0: ffff000008fe9000 ffff000008fe9000 ffff000008fd04a0 ffff000008fe9e90
>> [ 89.137792] bee0: 0000000000000000 0000000000000000 ffff8001ec8fd400 0000000000000000
>> [ 89.145605] bf00: 0000000000000000 ffff000009e3bf60 ffff00000808548c ffff000009e3bf60
>> [ 89.153418] bf20: ffff000008085490 0000000000000145 0000000000000000 0000000000000000
>> [ 89.161231] bf40: ffffffffffffffff ffff0000081409c4 ffff000009e3bf60 ffff000008085490
>> [ 89.169044] [<ffff0000080830f0>] el1_irq+0xb0/0x124
>> [ 89.173912] [<ffff000008085490>] arch_cpu_idle+0x10/0x18
>> [ 89.179213] [<ffff000008105f10>] do_idle+0x120/0x1e0
>> [ 89.184166] [<ffff00000810616c>] cpu_startup_entry+0x24/0x28
>> [ 89.189814] [<ffff00000808f1c8>] secondary_start_kernel+0x110/0x120
>> [ 89.196067] ---[ end trace 039d403d63546b77 ]---
>>
>> Below are the DT changes -
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>> b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>> index 0b0552c..ffe1b80 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra186.dtsi
>> @@ -27,21 +27,40 @@
>> #gpio-cells = <2>;
>> gpio-controller;
>> };
>> +
>> + mtl_tx_setup: tx-queues-config {
>> + snps,tx-queues-to-use = <0x4>;
>> + snps,tx-sched-sp;
>> + queue0 {
>> + snps,weight = <0x10>;
>> + snps,dcb-algorithm;
>> + snps,priority = <0x0>;
>> + };
>> + queue1 {
>> + snps,avb-algorithm;
>> + snps,send_slope = <0x1000>;
>> + snps,idle_slope = <0x1000>;
>> + snps,high_credit = <0x3E800>;
>> + snps,low_credit = <0xFFC18000>;
>> + snps,priority = <0x1>;
>> + };
>> + };
>> +
>> + mtl_rx_setup: rx-queues-config {
>> + snps,rx-queues-to-use = <0x4>;
>> + snps,rx-sched-sp;
>> + queue0 {
>> + snps,dcb-algorithm;
>> + snps,map-to-dma-channel = <0x0>;
>> + snps,priority = <0x0>;
>> + };
>> + };
>> ethernet@...0000 {
>> compatible = "nvidia,tegra186-eqos",
>> "snps,dwc-qos-ethernet-4.10";
>> reg = <0x0 0x02490000 0x0 0x10000>; @@ -57,6 +76,10 @@
>> snps,burst-map = <0x7>;
>> snps,txpbl = <32>;
>> snps,rxpbl = <8>;
>> +
>> + snps,mtl-tx-config = <&mtl_tx_setup>;
>> + snps,mtl-rx-config = <&mtl_rx_setup>;
>>
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