netdev - Re: [BNX2] A Netdev Watchdog with kernel stable 3.4

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Date:	Tue, 18 Nov 2014 22:58:39 -0800
From:	Michael Chan <mchan@...adcom.com>
To:	Rui Xiang <rui.xiang@...wei.com>, <sony.chacko@...gic.com>
CC:	<netdev@...r.kernel.org>
Subject: Re: [BNX2] A Netdev Watchdog with kernel stable 3.4

Copying the current maintainer Sony.  The PCI command register looks
strange.  Please see below.

On Wed, 2014-11-19 at 14:28 +0800, Rui Xiang wrote: 
> ping...
> 
> On 2014/11/17 20:42, Rui Xiang wrote:
> > Hi Michael,
> > 
> > On a system that was running stable 3.4.87, I got the below stack.
> > That was a NETDEV WATCHDOG. And we could also see watchdog timeouts with the 
> > BNX2. (After the stack, an oops occurred while running ifconfig. I think it 
> > would be related to this timeout.)
> > 
> > Otherwises, the bnx2_dump_state and bnx2_dump_mcp_state have printed the states. 
> > Through these states info, can we got the real situation of NIC1.
> > Or can we see what resulted the WATCHDOG, a bnx2 device fault or other reasons.
> > 
> > Thanks.
> > 
> > 
> > *The stack*:
> > 
> >  WARNING: at /usr/src/packages/BUILD/kernel-default-3.4.87/linux-3.4/net/sched/sch_generic.c:256 dev_watchdog+0x256/0x260()
> >  NETDEV WATCHDOG: NIC1 (bnx2): transmit queue 3 timed out
> >  Modules linked in: smb3_failover(O) smb2(O) smb(O) smb_manager(O) nfs(O) nfs_acl(O) nfsd(O) lockd(O) nal(O) auth_rpcgss(O) 
> > scsi_dh_hp_sw scsi_dh_alua scsi_dh_emc scsi_dh_rdac scsi_dh scsi_mod [last unloaded: ipmi_msghandler]
> >  Pid: 0, comm: swapper/0 Tainted: P        W  O 3.4.87-default #1
> >  Call Trace:
> >   <IRQ>  [<ffffffff8103fcea>] warn_slowpath_common+0x7a/0xb0
> >   [<ffffffff8103fdc1>] warn_slowpath_fmt+0x41/0x50
> >   [<ffffffff81047749>] ? raise_softirq_irqoff+0x9/0x30
> >   [<ffffffff813ae0f6>] dev_watchdog+0x256/0x260
> >   [<ffffffff813adea0>] ? dev_deactivate_queue.constprop.30+0x70/0x70
> >   [<ffffffff8104edc7>] run_timer_softirq+0x147/0x340
> >   [<ffffffff810470d8>] __do_softirq+0xc8/0x1e0
> >   [<ffffffff8109250f>] ? tick_program_event+0x1f/0x30
> >   [<ffffffff81460a6c>] call_softirq+0x1c/0x30
> >   [<ffffffff8100417d>] do_softirq+0x9d/0xd0
> >   [<ffffffff810474a5>] irq_exit+0xb5/0xc0
> >   [<ffffffff81021b49>] smp_apic_timer_interrupt+0x69/0xa0
> >   [<ffffffff8146006f>] apic_timer_interrupt+0x6f/0x80
> >   <EOI>  [<ffffffff81457bdd>] ? retint_restore_args+0x13/0x13
> >   [<ffffffff81360149>] ? poll_idle+0x49/0x90
> >   [<ffffffff8136011f>] ? poll_idle+0x1f/0x90
> >   [<ffffffff8135fcc9>] cpuidle_enter+0x19/0x20
> >   [<ffffffff813602f2>] cpuidle_idle_call+0xa2/0x250
> >   [<ffffffff8100b08f>] cpu_idle+0x6f/0xe0
> >   [<ffffffff81915960>] ? rawsock_init+0x12/0x12
> >   [<ffffffff814331c9>] rest_init+0x6d/0x74
> >   [<ffffffff818d3be5>] start_kernel+0x3a2/0x3af
> >   [<ffffffff818d3642>] ? repair_env_string+0x5e/0x5e
> >   [<ffffffff818d332a>] x86_64_start_reservations+0x131/0x135
> >   [<ffffffff818d342e>] x86_64_start_kernel+0x100/0x10f
> >  ---[ end trace 497e24e681e0c02d ]---
> >  bnx2 0000:05:00.1: NIC1: DEBUG: intr_sem[0] PCI_CMD[00100002]

The memory bit in PCI_CMD is set, but the bus master bit is not set.
DMA won't work if the bus master bit is not set.  What was happening
before the timeout?  Was it working fine for a while and it suddenly
stopped?

> >  bnx2 0000:05:00.1: NIC1: DEBUG: PCI_PM[19002008] PCI_MISC_CFG[92000088]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: EMAC_TX_STATUS[00000008] EMAC_RX_STATUS[00000000]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: RPM_MGMT_PKT_CTRL[40000088]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: HC_STATS_INTERRUPT_STATUS[01ff0000]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: PBA[00000000]
> >  bnx2 0000:05:00.1: NIC1: <--- start MCP states dump --->
> >  bnx2 0000:05:00.1: NIC1: DEBUG: MCP_STATE_P0[0003e10e] MCP_STATE_P1[0003e10e]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: MCP mode[0000b800] state[80008000] evt_mask[00000500]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: pc[08008f60] pc[0800d21c] instr[00051080]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: shmem states:
> >  bnx2 0000:05:00.1: NIC1: DEBUG: drv_mb[01030003] fw_mb[00000003] link_status[0000006f] drv_pulse_mb[0000073d]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: dev_info_signature[44564907] reset_type[01005254] condition[0003e10e]
> >  bnx2 0000:05:00.1: NIC1: DEBUG: 000003cc: 00000000 00000000 00000000 00000000
> >  bnx2 0000:05:00.1: NIC1: DEBUG: 000003dc: 00000000 00000000 00000000 00000000
> >  bnx2 0000:05:00.1: NIC1: DEBUG: 000003ec: 00000000 00000000 00000000 00000000
> >  bnx2 0000:05:00.1: NIC1: DEBUG: 0x3fc[00000000]
> >  bnx2 0000:05:00.1: NIC1: <--- end MCP states dump --->
> > 
> 
> 


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