[dpdk-dev] ugb_uio: r3.8xlarge bind failure

[Gregory Etelson <gregory@weka.io>]

Hello,

There are some AWS R3.8XLARGE instances 
that fail to bind Intel 10G VFs with igb_uio [c05cb4f939082]. 
System dmeg log show this backtrace:

igb_uio: probe of 0000:00:05.0 failed with error -16
IRQ handler type mismatch for IRQ 0
current handler: timer
Pid: 3619, comm: bash Not tainted 2.6.32-642.15.1.el6.x86_64 #1
Call Trace:
 [<ffffffff810f49e2>] ? __setup_irq+0x382/0x3c0
 [<ffffffffa03202a0>] ? uio_interrupt+0x0/0x48 [uio]
 [<ffffffff810f51e3>] ? request_threaded_irq+0x133/0x230
 [<ffffffffa0320193>] ? __uio_register_device+0x553/0x610 [uio]
 [<ffffffffa032698f>] ? igbuio_pci_probe+0x290/0x47a [igb_uio]
 [<ffffffff8129d00a>] ? kobject_get+0x1a/0x30
 [<ffffffff812c04f7>] ? local_pci_probe+0x17/0x20
 [<ffffffff812c16e1>] ? pci_device_probe+0x101/0x120
 [<ffffffff81382152>] ? driver_sysfs_add+0x62/0x90
 [<ffffffff813823fa>] ? driver_probe_device+0xaa/0x3a0
 [<ffffffff8138153a>] ? driver_bind+0xca/0x110
 [<ffffffff813805dc>] ? drv_attr_store+0x2c/0x30
 [<ffffffff812171c5>] ? sysfs_write_file+0xe5/0x170
 [<ffffffff81199e48>] ? vfs_write+0xb8/0x1a0
 [<ffffffff8119b336>] ? fget_light_pos+0x16/0x50
 [<ffffffff8119a981>] ? sys_write+0x51/0xb0

The VFs can be returned back to kernel ixgbevf driver with no faults. 

The instances can bind VFs with igb_uio[b58eedfc7dd57]

I could not find yet why some R3.8XLARGE instances can bind IXGBE VFs with 
igb_uio while other fail

lspci -vvv -s 0000:00:05.0
00:05.0 Ethernet controller: Intel Corporation 82599 Ethernet Controller 
Virtual Function (rev 01)
        Physical Slot: 5
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64
        Region 0: Memory at f3010000 (64-bit, prefetchable) [size=16K]
        Region 3: Memory at f3014000 (64-bit, prefetchable) [size=16K]
        Capabilities: [70] MSI-X: Enable+ Count=3 Masked-
                Vector table: BAR=3 offset=00000000
                PBA: BAR=3 offset=00002000
        Kernel driver in use: ixgbevf
        Kernel modules: ixgbevf

Regards,
Gregory