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nfp: set driver VF limit

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PCI subsystem has support for drivers limiting the number of VFs
available below what the IOV capability claims.  Make use of it.

While at it remove the #ifdef/#endif on CONFIG_PCI_IOV, it was
there to avoid unnecessary warnings in case device read failed
but kernel doesn't have SR-IOV support anyway.  Device reads
should not fail.

Note that we still need the driver-internal check for the case
where max VFs is 0 since PCI subsystem treats 0 as limit not set.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-05-28 17:52:54 -07:00 committed by David S. Miller
parent 9d3727595b
commit 651e1f2f19
1 changed files with 16 additions and 9 deletions
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25
drivers/net/ethernet/netronome/nfp/nfp_main.c
View file

@ -73,20 +73,22 @@ static const struct pci_device_id nfp_pci_device_ids[] = {
};
MODULE_DEVICE_TABLE(pci, nfp_pci_device_ids);
static void nfp_pcie_sriov_read_nfd_limit(struct nfp_pf *pf)
static int nfp_pcie_sriov_read_nfd_limit(struct nfp_pf *pf)
{
#ifdef CONFIG_PCI_IOV
int err;
pf->limit_vfs = nfp_rtsym_read_le(pf->cpp, "nfd_vf_cfg_max_vfs", &err);
if (!err)
return;
return pci_sriov_set_totalvfs(pf->pdev, pf->limit_vfs);
pf->limit_vfs = ~0;
pci_sriov_set_totalvfs(pf->pdev, 0); /* 0 is unset */
/* Allow any setting for backwards compatibility if symbol not found */
if (err != -ENOENT)
nfp_warn(pf->cpp, "Warning: VF limit read failed: %d\n", err);
#endif
if (err == -ENOENT)
return 0;
nfp_warn(pf->cpp, "Warning: VF limit read failed: %d\n", err);
return err;
}
static int nfp_pcie_sriov_enable(struct pci_dev *pdev, int num_vfs)
@ -373,14 +375,18 @@ static int nfp_pci_probe(struct pci_dev *pdev,
if (err)
goto err_devlink_unreg;
nfp_pcie_sriov_read_nfd_limit(pf);
err = nfp_net_pci_probe(pf);
err = nfp_pcie_sriov_read_nfd_limit(pf);
if (err)
goto err_fw_unload;
err = nfp_net_pci_probe(pf);
if (err)
goto err_sriov_unlimit;
return 0;
err_sriov_unlimit:
pci_sriov_set_totalvfs(pf->pdev, 0);
err_fw_unload:
if (pf->fw_loaded)
nfp_fw_unload(pf);
@ -411,6 +417,7 @@ static void nfp_pci_remove(struct pci_dev *pdev)
nfp_net_pci_remove(pf);
nfp_pcie_sriov_disable(pdev);
pci_sriov_set_totalvfs(pf->pdev, 0);
devlink_unregister(devlink);