From 651e1f2f19995c7585f34688331cda4f88e8df47 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Sun, 28 May 2017 17:52:54 -0700 Subject: [PATCH] nfp: set driver VF limit 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 Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/nfp_main.c | 23 ++++++++++++------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_main.c b/drivers/net/ethernet/netronome/nfp/nfp_main.c index f22f56c9218f..ba174e163834 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_main.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_main.c @@ -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_pcie_sriov_read_nfd_limit(pf); + if (err) + goto err_fw_unload; err = nfp_net_pci_probe(pf); if (err) - goto err_fw_unload; + 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); -- 2.20.1