Subject: [PATCH 2/3] PCI/IOV: provide flag to skip VF scanning

From: Sebastian Ott <[email-masked]>
Date: Fri, 21 Dec 2018 15:14:19 +0100

Provide a flag to skip scanning for new VFs after SRIOV enablement.
This can be set by implementations for which the VFs are already
reported by other means.

Signed-off-by: Sebastian Ott <[email-masked]>
Reviewed-by: Christoph Hellwig <[email-masked]>
---
 drivers/pci/iov.c   | 6 ++++++
 include/linux/pci.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 408db232a328..3aa115ed3a65 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -257,6 +257,9 @@ static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
 	unsigned int i;
 	int rc;
 
+	if (dev->no_vf_scan)
+		return 0;
+
 	for (i = 0; i < num_vfs; i++) {
 		rc = pci_iov_add_virtfn(dev, i);
 		if (rc)
@@ -385,6 +388,9 @@ static void sriov_del_vfs(struct pci_dev *dev)
 	struct pci_sriov *iov = dev->sriov;
 	int i;
 
+	if (dev->no_vf_scan)
+		return;
+
 	for (i = 0; i < iov->num_VFs; i++)
 		pci_iov_remove_virtfn(dev, i);
 }
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 11c71c4ecf75..f9bc7651c406 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -405,6 +405,7 @@ struct pci_dev {
 	unsigned int	non_compliant_bars:1;	/* Broken BARs; ignore them */
 	unsigned int	is_probed:1;		/* Device probing in progress */
 	unsigned int	link_active_reporting:1;/* Device capable of reporting link active */
+	unsigned int	no_vf_scan:1;		/* Don't scan for VFs after IOV enablement */
 	pci_dev_flags_t dev_flags;
 	atomic_t	enable_cnt;	/* pci_enable_device has been called */
 
-- 
2.13.4