[Bug 289569] Issues with SR-IOV functionality

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289569

--- Comment #1 from Marek Zarychta <[email protected]> ---
(In reply to Sad Clouds from comment #0)
>3. There seems to be no way to configure multiple TX and RX queues for virtual interfaces.
>
>The following settings in /boot/loader.conf get completely ignored:
>
>dev.ixv.0.iflib.override_qs_enable=1
>dev.ixv.0.iflib.override_nrxqs=4
>dev.ixv.0.iflib.override_ntxqs=4
>
>and all virtual interfaces end up with 1 TX and 1 RX queue:
>
>ixv0: <Intel(R) X520 82599 Virtual Function> at device 0.128 on pci3
>ixv0: Using 2048 TX descriptors and 2048 RX descriptors
>ixv0: Using 1 RX queues 1 TX queues

I wonder why this device is named ixv? ixv(4) seems to be non-existent in
FreeBSD. Are you using custom drivers?

I was also trying to enable SR-IOV on this NIC for many tries, without success,
but the name looks different, and these iflib settings from loader.conf are not
ignored:

dev.ix.0.iflib.override_qs_enable=1
dev.ix.0.iflib.override_nrxqs=16
dev.ix.0.iflib.override_ntxqs=16
dev.ix.0.iflib.override_nrxds="4096"

Device names are ix# in my case:

ix0: <Intel(R) X520 82599ES (SFI/SFP+)> port 0x2020-0x203f mem
0x92100000-0x921fffff,0x92204000-0x92207fff irq 44 at device 0.0 numa-domain 0
on pci5
ix0: Using 4096 TX descriptors and 4096 RX descriptors
ix0: Using 16 RX queues 16 TX queues
ix0: Using MSI-X interrupts with 17 vectors
ix0: allocated for 16 queues
ix0: allocated for 16 rx queues
ix0: Ethernet address: 24:6e:xx:xx:xx:70
ix0: PCI Express Bus: Speed 5.0GT/s Width x8
ix0: Option ROM V19-b0-p12 eTrack 0x8000095c
ix0: netmap queues/slots: TX 16/4096, RX 16/4096

ix1: <Intel(R) X520 82599ES (SFI/SFP+)> port 0x2000-0x201f mem
0x92000000-0x920fffff,0x92200000-0x92203fff irq 40 at device 0.1 numa-domain 0
on pci5
ix1: Using 2048 TX descriptors and 2048 RX descriptors
ix1: Using 8 RX queues 8 TX queues
ix1: Using MSI-X interrupts with 9 vectors
ix1: allocated for 8 queues
ix1: allocated for 8 rx queues
ix1: Ethernet address: 24:6e:xx:xx:xx:72
ix1: PCI Express Bus: Speed 5.0GT/s Width x8
ix1: Option ROM V19-b0-p12 eTrack 0x8000095c
ix1: netmap queues/slots: TX 8/2048, RX 8/2048

Nevertheless, when I try to enable IOV, it results in a constant panic: APEI
Fatal Hardware Error!

The platform is Dell PowerEdge R630 and has been tested many times in the past
on stable/14 and recently on stable/15.

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