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PCI: Do not attempt to set ExtTag for VFs

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The bit for enabling extended tags is Reserved and Preserved (RsvdP) for
VFs, according to PCIe r7.0 section 7.5.3.4 table 7.21.  Hence, bail out
early from pci_configure_extended_tags() if the device is a VF.

Otherwise, we may see incorrect log messages such as:

  kernel: pci 0000:af:00.2: enabling Extended Tags

(af:00.2 is a VF)

Fixes: 60db3a4d8c ("PCI: Enable PCIe Extended Tags if supported")
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Link: https://patch.msgid.link/20251112095442.1913258-1-haakon.bugge@oracle.com
This commit is contained in:
Håkon Bugge 2025-11-12 10:54:40 +01:00 committed by Bjorn Helgaas
parent 8f0b4cce44
commit 73711730a1
1 changed files with 2 additions and 1 deletions
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3
drivers/pci/probe.c
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@ -2270,7 +2270,8 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign)
u16 ctl;
int ret;
if (!pci_is_pcie(dev))
/* PCI_EXP_DEVCTL_EXT_TAG is RsvdP in VFs */
if (!pci_is_pcie(dev) || dev->is_virtfn)
return 0;
ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);