nfp: don't fail probe on pci_sriov_set_totalvfs() errors

On machines with buggy ACPI tables or when SR-IOV is already enabled
we may not be able to set the SR-IOV VF limit in sysfs, it's not fatal
because the limit is imposed by the driver anyway.  Only the sysfs
'sriov_totalvfs' attribute will be too high.  Print an error to inform
user about the failure but allow probe to continue.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c
index 152283d..4a540c5 100644 (file)
--- a/drivers/net/ethernet/netronome/nfp/nfp_main.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c
@@ -236,16 +236,20 @@ static int nfp_pcie_sriov_read_nfd_limit(struct nfp_pf *pf)
        int err;
 
        pf->limit_vfs = nfp_rtsym_read_le(pf->rtbl, "nfd_vf_cfg_max_vfs", &err);
-       if (!err)
-               return pci_sriov_set_totalvfs(pf->pdev, pf->limit_vfs);
+       if (err) {
+               /* For backwards compatibility if symbol not found allow all */
+               pf->limit_vfs = ~0;
+               if (err == -ENOENT)
+                       return 0;
 
-       pf->limit_vfs = ~0;
-       /* Allow any setting for backwards compatibility if symbol not found */
-       if (err == -ENOENT)
-               return 0;
+               nfp_warn(pf->cpp, "Warning: VF limit read failed: %d\n", err);
+               return err;
+       }
 
-       nfp_warn(pf->cpp, "Warning: VF limit read failed: %d\n", err);
-       return err;
+       err = pci_sriov_set_totalvfs(pf->pdev, pf->limit_vfs);
+       if (err)
+               nfp_warn(pf->cpp, "Failed to set VF count in sysfs: %d\n", err);
+       return 0;
 }
 
 static int nfp_pcie_sriov_enable(struct pci_dev *pdev, int num_vfs)