On Mon, May 8, 2017 at 9:56 AM, Jan Kiszka <jan.kis...@siemens.com> wrote:
> On 2017-03-15 12:04, Joao Pinto wrote:
>> This patch prepares DMA Operation Mode configuration for multiple queues.
>> The work consisted on breaking the DMA operation Mode configuration function
>> into RX and TX scope and adapting its mechanism in stmmac_main.
> Starting with this patch, the stmmac-based network adapters of the Intel
> Quark SoC stop working. I'm getting an IP via DHCP, I can ping, but TCP
> connections can no longer be established.
>
> Moving on a few patches (didn't bisect the exact one yet), the TX
> watchdog starts to fire, and DHCP fails completely. And if I go to
> current master in Linus tree (reverting an unrelated boot regression), I
> even get a crash in stmmac_xmit.
>
> Here are some details about the hw from dma_cap POV, if this helps:
>
> ==============================
> DMA HW features
> ==============================
> 10/100 Mbps: Y
> 1000 Mbps: N
> Half duplex: Y
> Hash Filter: Y
> Multiple MAC address registers: N
> PCS (TBI/SGMII/RTBI PHY interfaces): N
> SMA (MDIO) Interface: Y
> PMT Remote wake up: N
> PMT Magic Frame: N
> RMON module: Y
> IEEE 1588-2002 Time Stamp: N
> IEEE 1588-2008 Advanced Time Stamp: Y
> 802.3az - Energy-Efficient Ethernet (EEE): N
> AV features: N
> Checksum Offload in TX: Y
> IP Checksum Offload (type1) in RX: N
> IP Checksum Offload (type2) in RX: Y
> RXFIFO > 2048bytes: Y
> Number of Additional RX channel: 0
> Number of Additional TX channel: 0
> Enhanced descriptors: Y
>
> Given the number of different failure modes, my feeling is that there
> are multiple regressions coming with these patches...
>
> I've tested on the IOT2000 board, but I suspect the Galileo Gen2 will be
> affected equally. If you don't have access to any such device, let me
> know what I can debug for you.
JFYI: With today's linux-next when _kexec:ed_ kernel boots I tried and
got the following:
# ip a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferre[ 130.403995] random: fast init done
d_lft forever
2: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
4: sit0@NONE: <NOARP> mtu 1480 qdisc noop qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
# udhcpc -i eth0
udhcpc: started, v1.26.2
[ 140.825131] stmmaceth 0000:00:14.6 eth0: device MAC address 98:4f:ee:05:ac:47
[ 140.834304] Generic PHY stmmac-a6:01: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=stmmac-a6:01, irq=-1)
[ 140.930871] stmmaceth 0000:00:14.6 eth0: IEEE 1588-2008 Advanced
Timestamp supported
[ 140.941109] stmmaceth 0000:00:14.6 eth0: registered PTP clock
[ 140.953626] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
udhcpc: sending discover
[ 142.979557] stmmaceth 0000:00:14.6 eth0: Link is Up - 100Mbps/Full
- flow control off
[ 142.988756] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 142.998810] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 143.006193] IP: stmmac_xmit+0xf1/0x1080
[ 143.010168] *pde = 00000000
[ 143.010177]
[ 143.014762] Oops: 0002 [#1]
[ 143.017672] Modules linked in: at24 nvmem_core pwm_pca9685
[ 143.023338] CPU: 0 PID: 0 Comm: swapper Not tainted 4.11.0-next-20170508+ #2
[ 143.030539] task: c8533580 task.stack: c852c000
[ 143.035237] EIP: stmmac_xmit+0xf1/0x1080
[ 143.039302] EFLAGS: 00010216 CPU: 0
[ 143.042915] EAX: 00000000 EBX: 00000050 ECX: 00000000 EDX: ceb6a0c0
[ 143.049326] ESI: 00000000 EDI: cdd16000 EBP: cdc25d70 ESP: cdc25d20
[ 143.055735] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[ 143.061271] CR0: 80050033 CR2: 00000000 CR3: 0eb5c000 CR4: 00100010
[ 143.067671] Call Trace:
[ 143.070238] <SOFTIRQ>
[ 143.072763] dev_hard_start_xmit+0x7c/0x1a0
[ 143.077120] sch_direct_xmit+0xf0/0x120
[ 143.081130] __dev_queue_xmit+0x181/0x430
[ 143.085311] ? eth_commit_mac_addr_change+0x20/0x20
[ 143.090362] dev_queue_xmit+0xa/0x10
[ 143.094100] neigh_resolve_output+0xdb/0x190
[ 143.098561] ip6_finish_output2+0x184/0x500
[ 143.102945] ip6_finish_output+0x91/0xe0
[ 143.107057] ? ip6_finish_output+0x91/0xe0
[ 143.111338] ip6_output+0x36/0x110
[ 143.114924] ? ip6_fragment+0xb00/0xb00
[ 143.118935] mld_sendpack+0x191/0x2b0
[ 143.122769] ? mld_newpack+0xda/0x180
[ 143.126598] ? ipv6_icmp_sysctl_init+0x30/0x30
[ 143.131224] mld_ifc_timer_expire+0x158/0x240
[ 143.135756] ? find_next_bit+0xa/0x10
[ 143.139584] ? mld_dad_timer_expire+0x50/0x50
[ 143.144112] call_timer_fn+0x2a/0xf0
[ 143.147862] ? mld_dad_timer_expire+0x50/0x50
[ 143.152395] run_timer_softirq+0x158/0x300
[ 143.156668] ? file_free_rcu+0x1e/0x30
[ 143.160589] __do_softirq+0xc4/0x200
[ 143.164341] ? __hrtimer_tasklet_trampoline+0x30/0x30
[ 143.169575] do_softirq_own_stack+0x1e/0x30
[ 143.173902] </SOFTIRQ>
[ 143.176502] irq_exit+0x95/0xa0
[ 143.179812] smp_apic_timer_interrupt+0x31/0x40
[ 143.184530] apic_timer_interrupt+0x32/0x40
[ 143.188889] EIP: default_idle+0xc/0x70
[ 143.192774] EFLAGS: 00000246 CPU: 0
[ 143.196386] EAX: 00000000 EBX: 00000000 ECX: 00000001 EDX: 00000000
[ 143.202795] ESI: 00000000 EDI: c8533580 EBP: c852df54 ESP: c852df4c
[ 143.209205] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[ 143.214780] arch_cpu_idle+0x9/0x10
[ 143.218446] default_idle_call+0x17/0x30
[ 143.222551] do_idle+0xed/0x130
[ 143.225873] cpu_startup_entry+0x15/0x20
[ 143.229965] rest_init+0x5c/0x60
[ 143.233370] start_kernel+0x313/0x318
[ 143.237221] i386_start_kernel+0x98/0x9c
[ 143.241315] startup_32_smp+0x16b/0x16d
[ 143.245289] Code: 84 45 06 00 00 c1 e2 05 03 94 c7 9c 09 00 00 89
55 b0 8b 45 c8 8b 75 bc 8b 55 d8 8d 1c 80 89
75 e4 c1 e3 03 8b 84 1f a4 09 00 00 <89> 14 b0 8b 87 40 0d 00 00 8b 40
24 85 c0 89 45 b8 0f 85 68 02
[ 143.264746] EIP: stmmac_xmit+0xf1/0x1080 SS:ESP: 0068:cdc25d20
[ 143.270727] CR2: 0000000000000000
[ 143.274175] ---[ end trace 79da8ef70f8b98d7 ]---
[ 143.278925] Kernel panic - not syncing: Fatal exception in interrupt
[ 143.285433] Kernel Offset: 0x6a00000 from 0xc1000000 (relocation
range: 0xc0000000-0xd05effff)
[ 143.294268] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
--
With Best Regards,
Andy Shevchenko
