Date:   Sat, 23 Apr 2022 22:58:07 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
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        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
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        <linux-arm-kernel@...ts.infradead.org>,
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        "kuba@...nel.org" <kuba@...nel.org>
Subject: net: stmmac: dwmac-imx: half duplex crash

Hi there

We lately tried operating the IMX8MPEVK ENET_QOS imx-dwmac driver in half-duplex modes which crashes as
follows:

root@...8mpevk:~# uname -a
Linux imx8mpevk 5.18.0-rc2-next-20220413-00006-gc741306ff2ed #4 SMP PREEMPT Wed Apr 13 15:08:36 CEST 2022
aarch64 aarch64 aarch64 GNU/Linux
root@...8mpevk:~# ethtool -s eth1 advertise 0x004
[  469.685304] imx-dwmac 30bf0000.ethernet eth1: Link is Down
[  469.703528] kauditd_printk_skb: 1 callbacks suppressed
[  469.703539] audit: type=1334 audit(1650754238.319:23): prog-id=17 op=LOAD
[  469.715602] audit: type=1334 audit(1650754238.327:24): prog-id=18 op=LOAD
[  472.737884] imx-dwmac 30bf0000.ethernet eth1: Link is Up - 100Mbps/Half - flow control off
[  472.746205] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[  478.080481] ------------[ cut here ]------------
[  478.085134] NETDEV WATCHDOG: eth1 (imx-dwmac): transmit queue 1 timed out
[  478.091985] WARNING: CPU: 3 PID: 0 at net/sched/sch_generic.c:529 dev_watchdog+0x200/0x210
[  478.100269] Modules linked in: 8021q garp mrp stp llc overlay bluetooth ecdh_generic ecc rfkill caam_jr
caamhash_desc caamalg_desc crypto_engine rng_core authenc libdes dwmac_imx stmmac_platform imx_sdma
crct10dif_ce fsl_imx8_ddr_perf stmmac pcs_xpcs etnaviv gpu_sched flexcan caam snvs_pwrkey error can_dev
rtc_snvs imx_cpufreq_dt imx8mm_thermal fuse drm ipv6
[  478.132142] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.18.0-rc2-next-20220413-00006-gc741306ff2ed #4
[  478.141364] Hardware name: NXP i.MX8MPlus EVK board (DT)
[  478.146676] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  478.153644] pc : dev_watchdog+0x200/0x210
[  478.157662] lr : dev_watchdog+0x200/0x210
[  478.161680] sp : ffff80000a3b3a70
[  478.164992] x29: ffff80000a3b3a70 x28: 0000000000000005 x27: ffff800008e57600
[  478.172140] x26: ffff800009ef79c0 x25: ffff00017f3c7fe8 x24: ffff80000a3b3b40
[  478.179283] x23: ffff800009ef7000 x22: 0000000000000001 x21: ffff0000c4cc039c
[  478.186428] x20: ffff0000c4cc0000 x19: ffff0000c4cc0448 x18: 0000000000000030
[  478.193571] x17: ffff800175a13000 x16: ffff80000a2e4000 x15: ffffffffffffffff
[  478.200713] x14: ffff800009f12388 x13: 00000000000004ec x12: 00000000000001a4
[  478.207860] x11: 712074696d736e61 x10: ffff800009f6a388 x9 : 00000000fffff000
[  478.215003] x8 : ffff800009f12388 x7 : 0000000000000003 x6 : 0000000000000000
[  478.222146] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
[  478.229294] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c01a0000
[  478.236439] Call trace:
[  478.238886]  dev_watchdog+0x200/0x210
[  478.242556]  call_timer_fn.constprop.0+0x24/0x80
[  478.247182]  __run_timers.part.0+0x1f4/0x23c
[  478.251454]  run_timer_softirq+0x3c/0x7c
[  478.255384]  __do_softirq+0x124/0x2a0
[  478.259047]  __irq_exit_rcu+0xe4/0x100
[  478.262804]  irq_exit_rcu+0x10/0x1c
[  478.266300]  el1_interrupt+0x38/0x70
[  478.269881]  el1h_64_irq_handler+0x18/0x24
[  478.273988]  el1h_64_irq+0x64/0x68
[  478.277393]  arch_cpu_idle+0x18/0x2c
[  478.280969]  default_idle_call+0x24/0x6c
[  478.284900]  do_idle+0x22c/0x29c
[  478.288133]  cpu_startup_entry+0x28/0x30
[  478.292065]  secondary_start_kernel+0x140/0x164
[  478.296600]  __secondary_switched+0xa0/0xa4
[  478.300789] ---[ end trace 0000000000000000 ]---
[  478.305451] imx-dwmac 30bf0000.ethernet eth1: Reset adapter.
[  478.332901] imx-dwmac 30bf0000.ethernet eth1: FPE workqueue stop
[  478.339233] imx-dwmac 30bf0000.ethernet eth1: Timeout accessing MAC_VLAN_Tag_Filter
[  478.346962] imx-dwmac 30bf0000.ethernet eth1: failed to kill vid 0081/0
[  478.556494] imx-dwmac 30bf0000.ethernet eth1: PHY [stmmac-1:01] driver [RTL8211F Gigabit Ethernet]
(irq=POLL)
[  478.736560] imx-dwmac 30bf0000.ethernet eth1: Register MEM_TYPE_PAGE_POOL RxQ-0
[  478.744388] imx-dwmac 30bf0000.ethernet eth1: Register MEM_TYPE_PAGE_POOL RxQ-1
[  478.752222] imx-dwmac 30bf0000.ethernet eth1: Register MEM_TYPE_PAGE_POOL RxQ-2
[  478.760126] imx-dwmac 30bf0000.ethernet eth1: Register MEM_TYPE_PAGE_POOL RxQ-3
[  478.767951] imx-dwmac 30bf0000.ethernet eth1: Register MEM_TYPE_PAGE_POOL RxQ-4
[  478.784520] imx-dwmac 30bf0000.ethernet eth1: No Safety Features support found
[  478.791787] imx-dwmac 30bf0000.ethernet eth1: IEEE 1588-2008 Advanced Timestamp supported
[  478.800227] imx-dwmac 30bf0000.ethernet eth1: registered PTP clock
[  478.806610] imx-dwmac 30bf0000.ethernet eth1: FPE workqueue start
[  478.812774] imx-dwmac 30bf0000.ethernet eth1: configuring for phy/rgmii-id link mode
[  478.848739] 8021q: adding VLAN 0 to HW filter on device eth1

Does anybody have any experience in running dwmac in half-duplex mode? Any suggestions?

BTW: It also crashes the same way running NXP's latest downstream LF5.15.5_1.0.0 which I reported here [1].

[1]
https://community.nxp.com/t5/i-MX-Processors/IMX8MPEVK-ENET-QOS-imx-dwmac-Half-Duplex-Crashes/m-p/1448085#M189597

Cheers

Marcel

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