Help with Network SR-IOV (PF still in reset state. Is the PF interface up?)

From: Bhasker C V <bhasker@unixindia.com>
To: xen-devel@lists.xenproject.org, xen-users@lists.xenproject.org
Subject: Help with Network SR-IOV (PF still in reset state. Is the PF interface up?)
Date: Sat, 4 Sep 2021 16:12:01 +0100	[thread overview]
Message-ID: <CAPLCSGCkdZMph=iRrqf3G5kT881mN5kYaG=qXrMtWS=fTn2O=g@mail.gmail.com> (raw)

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I run  xen-4.14.3-pre from debian

I created 6 vfs for my igb card
06:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network
Connection (rev 01)
I got these
07:10.0 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)
07:10.1 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)
07:10.4 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)
07:10.5 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)
07:11.0 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)
07:11.1 Ethernet controller: Intel Corporation I350 Ethernet Controller
Virtual Function (rev 01)

bcv@bcvibmb1:~$ sudo xl pci-assignable-list
0000:07:10.1

However the guest is not able to see the link up.
bcv@utils:~$ sudo ethtool  enp0s0f1

Settings for enp0s0f1:

        Supported ports: [ ]
...

        Link detected: no

I see this error on the guest

[    6.134890] igbvf 0000:00:00.1: Xen PCI mapped GSI0 to IRQ19

[    6.149577] igbvf 0000:00:00.1: PF still in reset state. Is the PF
interface up?

[    6.149595] igbvf 0000:00:00.1: Assigning random MAC address.

[    6.151552] igbvf 0000:00:00.1: PF still resetting

[    6.153807] igbvf 0000:00:00.1: Intel(R) I350 Virtual Function

[    6.153822] igbvf 0000:00:00.1: Address: 32:91:70:c5:62:bd

and thiis on the host:
[  390.776779] xen-blkback: backend/vbd/3/51713: using 1 queues, protocol 1
(x86_64-abi) persistent grants

[  395.849996] pciback 0000:07:10.1: xen-pciback: Driver tried to write to
a read-only configuration space field at offset 0x1d6, size 2. This may be
harmless, but if you have problems with your device:

[  395.849996] 1) see permissive attribute in sysfs

[  395.849996] 2) report problems to the xen-devel mailing list along with
details of your device obtained from lspci.

[  396.103595] pciback 0000:07:10.1: enabling device (0000 -> 0002)

However if I pass through 07:10.4 it works fine. The host still reports
this  above error but all works well in the guest.

Please could someone help ? I have been using  KVM these years and just
moved to xen and hence new to xen.

Regards
Bhasker C V

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