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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@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
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;