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nfp: handle SR-IOV already enabled when driver is probing

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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@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-06-27 00:50:25 -07:00 committed by David S. Miller
parent 168c478e10
commit 0dc7862191
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/netronome/nfp/nfp_main.c
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@ -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;