Hi Ben,
thanks for the tip! tso was already disabled.
I tried anyway and unfortunately it crashes as before.

I filled a bug report
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197535) and marius@
is giving me a big help on it.

Best regards,
Luca

On Fri, Feb 13, 2015 at 7:34 PM, Ben Perrault <ben.perra...@gmail.com> wrote:
> Luca,
>
> I've had the same issue with this interface on both PCIe boards and embedded 
> in a handful of Lenovo products. The one, fairly ugly workaround I've found 
> that makes it work well enough is disable tso ( i.e. ifconfig re0 down && 
> ifconfig re0 -tso && ifconfig re0 up ). This also seems to stop the panics 
> under current.
>
> I'm not sure it will work for you - but it has on everyone of those 
> interfaces I've dealt with.
>
> Good luck,
> -bp
>
>> On Feb 13, 2015, at 8:06 AM, Luca Pizzamiglio <luca.pizzamig...@gmail.com> 
>> wrote:
>>
>> Hi, I'm Luca,
>>
>> I've some issues using a PCIe Realtek Ethernet board:
>> re0@pci0:3:0:0: class=0x020000 card=0x012310ec chip=0x816810ec rev=0x0c 
>> hdr=0x00
>>    vendor     = 'Realtek Semiconductor Co., Ltd.'
>>    device     = 'RTL8111/8168B PCI Express Gigabit Ethernet controller'
>>    class      = network
>>    subclass   = ethernet
>>    bar   [10] = type I/O Port, range 32, base 0x1000, size 256, enabled
>>    bar   [18] = type Memory, range 64, base 0x90500000, size 4096, enabled
>>    bar   [20] = type Prefetchable Memory, range 64, base 0x90400000,
>> size 16384, enabled
>>    cap 01[40] = powerspec 3  supports D0 D1 D2 D3  current D0
>>    cap 05[50] = MSI supports 1 message, 64 bit
>>    cap 10[70] = PCI-Express 2 endpoint IRQ 1 max data 128(128) link x1(x1)
>>                 speed 2.5(2.5) ASPM disabled(L0s/L1)
>>    cap 11[b0] = MSI-X supports 4 messages
>>                 Table in map 0x20[0x0], PBA in map 0x20[0x800]
>>    cap 03[d0] = VPD
>>    ecap 0001[100] = AER 1 0 fatal 0 non-fatal 0 corrected
>>    ecap 0002[140] = VC 1 max VC0
>>    ecap 0003[160] = Serial 1 01000000684ce000
>>    ecap 0018[170] = LTR 1
>>
>> Rx and Tx don't work. After some minutes the interface is activated I
>> get kernel panic.
>> I've already tried to disable MSIx and MSI.
>> It seems a DMA problem, rx fill the 256 descriptors and the nothing
>> else until the panic. netstat -s shows now new packets.
>>
>> I filled a bug report with more infos:
>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197535
>>
>> could someone kindly pointing some ideas?
>>
>> Best regards,
>> Luca
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