SRIOV memory allocation

SRIOV memory allocation

[J.Hwan Kim]

Hi, everyone

I'd like to know what routine of the PCIe allocates SR-IOV BAR memory.

When I put into the network card supporting SR-IOV in my system,
it returns error indicating "MMIO resource" is insufficient when sriov 
is enabled.

The routine is in iov.c

for (i = 0; i < PCI_SRIOV_NUM_BARS/*6*/; i++) {
         res = dev->resource + PCI_IOV_RESOURCES + i;
         if (res->parent)
             nres++;
}
if (nres != iov->nres) {
       dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
       return -ENOMEM;
}

So, I hope to know where the resources of IOV is assigned the parent 
pointer.

Thanks in advance.

Best Regards,
J.Hwan Kim

SRIOV memory allocation

[Peter Teoh]

Is your system 32bit or 64bit?   Before putting the card, there was no
memory problem right?

And after putting in the card, memory resources all get used up right (by
IOV)?   It looked like it is similar to this problem:

http://communities.intel.com/thread/23318

>From above and here:

http://www.mjmwired.net/kernel/Documentation/PCI/pci-iov-howto.txt

it seemed that this hardware feature requires BIOS support, and so if ur
hardware does not have it, SR-IOV is not possible, thus giving rise to
those errors u have seen.

On Sat, Apr 7, 2012 at 4:11 PM, J.Hwan Kim <frog1120@gmail.com> wrote:

> Hi, everyone
>
> I'd like to know what routine of the PCIe allocates SR-IOV BAR memory.
>
> When I put into the network card supporting SR-IOV in my system,
> it returns error indicating "MMIO resource" is insufficient when sriov
> is enabled.
>
> The routine is in iov.c
>
> for (i = 0; i < PCI_SRIOV_NUM_BARS/*6*/; i++) {
>         res = dev->resource + PCI_IOV_RESOURCES + i;
>         if (res->parent)
>             nres++;
> }
> if (nres != iov->nres) {
>       dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
>       return -ENOMEM;
> }
>
> So, I hope to know where the resources of IOV is assigned the parent
> pointer.
>
> Thanks in advance.
>
> Best Regards,
> J.Hwan Kim
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Regards,
Peter Teoh
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SRIOV memory allocation

[Peter Teoh]

More info:

http://communities.intel.com/community/wired/blog/2011/01/19/come-and-get-it-sr-iov-primer-document-updated

as indicated from here:

http://communities.intel.com/message/132184#132184

On Tue, Apr 10, 2012 at 12:15 AM, Peter Teoh <htmldeveloper@gmail.com>wrote:

> Is your system 32bit or 64bit?   Before putting the card, there was no
> memory problem right?
>
> And after putting in the card, memory resources all get used up right (by
> IOV)?   It looked like it is similar to this problem:
>
> http://communities.intel.com/thread/23318
>
> From above and here:
>
> http://www.mjmwired.net/kernel/Documentation/PCI/pci-iov-howto.txt
>
> it seemed that this hardware feature requires BIOS support, and so if ur
> hardware does not have it, SR-IOV is not possible, thus giving rise to
> those errors u have seen.
>
> On Sat, Apr 7, 2012 at 4:11 PM, J.Hwan Kim <frog1120@gmail.com> wrote:
>
>> Hi, everyone
>>
>> I'd like to know what routine of the PCIe allocates SR-IOV BAR memory.
>>
>> When I put into the network card supporting SR-IOV in my system,
>> it returns error indicating "MMIO resource" is insufficient when sriov
>> is enabled.
>>
>> The routine is in iov.c
>>
>> for (i = 0; i < PCI_SRIOV_NUM_BARS/*6*/; i++) {
>>         res = dev->resource + PCI_IOV_RESOURCES + i;
>>         if (res->parent)
>>             nres++;
>> }
>> if (nres != iov->nres) {
>>       dev_err(&dev->dev, "not enough MMIO resources for SR-IOV\n");
>>       return -ENOMEM;
>> }
>>
>> So, I hope to know where the resources of IOV is assigned the parent
>> pointer.
>>
>> Thanks in advance.
>>
>> Best Regards,
>> J.Hwan Kim
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
>
> --
> Regards,
> Peter Teoh
>



-- 
Regards,
Peter Teoh
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