netdev - [PATCH net-next 11/14] nfp: handle SR-IOV already enabled when driver is probing

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Message-Id: <20170627075028.4009-12-jakub.kicinski@netronome.com>
Date:   Tue, 27 Jun 2017 00:50:25 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org
Cc:     oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next 11/14] nfp: handle SR-IOV already enabled when driver is probing

We assumed that when we probe number of enabled VFs will be at 0.
This doesn't have to be the case for example if previous driver left
SR-IOV enabled due to some VFs being assigned.  Read the number of VFs
enabled.  Fail probe if it's above current FWs limit.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Simon Horman <simon.horman@...ronome.com>
---
 drivers/net/ethernet/netronome/nfp/nfp_main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 748e54cc885e..d47adb4c86d6 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -414,6 +414,14 @@ static int nfp_pci_probe(struct pci_dev *pdev,
 	if (err)
 		goto err_fw_unload;
 
+	pf->num_vfs = pci_num_vf(pdev);
+	if (pf->num_vfs > pf->limit_vfs) {
+		dev_err(&pdev->dev,
+			"Error: %d VFs already enabled, but loaded FW can only support %d\n",
+			pf->num_vfs, pf->limit_vfs);
+		goto err_fw_unload;
+	}
+
 	err = nfp_net_pci_probe(pf);
 	if (err)
 		goto err_sriov_unlimit;
-- 
2.11.0