Re: [PATCH v3 net-next 01/11] net: stmmac: prepare dma op mode config for multiple queues

On Mon, May 8, 2017 at 9:56 AM, Jan Kiszka [off-list ref] wrote:

On 2017-03-15 12:04, Joao Pinto wrote:

quoted

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