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OpenCloudOS-Kernel
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nfp: reorder SR-IOV config and nfp_app SR-IOV callbacks 

We previously assumed that app callback can be guaranteed to be
executed before SR-IOV is actually enabled.  Given that we can't
guarantee that SR-IOV will be disabled during probe or that we
will be able to disable it on remove, we should reorder the callbacks.
We should also call the app's sriov_enable if SR-IOV was enabled
during probe.

Application FW must be able to disable VFs internally and not depend
on them being removed at PCIe level.

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 00:50:26 -07:00 committed by David S. Miller
parent 0dc7862191
commit e3f28473b8
2 changed files with 27 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/net/ethernet/netronome/nfp/nfp_main.c
View File

@ -107,17 +107,18 @@ static int nfp_pcie_sriov_enable(struct pci_dev *pdev, int num_vfs)
goto err_unlock;
}
err = nfp_app_sriov_enable(pf->app, num_vfs);
err = pci_enable_sriov(pdev, num_vfs);
if (err) {
dev_warn(&pdev->dev, "App specific PCI sriov configuration failed: %d\n",
err);
dev_warn(&pdev->dev, "Failed to enable PCI SR-IOV: %d\n", err);
goto err_unlock;
}
err = pci_enable_sriov(pdev, num_vfs);
err = nfp_app_sriov_enable(pf->app, num_vfs);
if (err) {
dev_warn(&pdev->dev, "Failed to enable PCI sriov: %d\n", err);
goto err_app_sriov_disable;
dev_warn(&pdev->dev,
"App specific PCI SR-IOV configuration failed: %d\n",
err);
goto err_sriov_disable;
}
pf->num_vfs = num_vfs;
@ -127,8 +128,8 @@ static int nfp_pcie_sriov_enable(struct pci_dev *pdev, int num_vfs)
mutex_unlock(&pf->lock);
return num_vfs;
err_app_sriov_disable:
nfp_app_sriov_disable(pf->app);
err_sriov_disable:
pci_disable_sriov(pdev);
err_unlock:
mutex_unlock(&pf->lock);
return err;
@ -136,17 +137,20 @@ err_unlock:
return 0;
}
static int __nfp_pcie_sriov_disable(struct pci_dev *pdev)
static int nfp_pcie_sriov_disable(struct pci_dev *pdev)
{
#ifdef CONFIG_PCI_IOV
struct nfp_pf *pf = pci_get_drvdata(pdev);
mutex_lock(&pf->lock);
/* If the VFs are assigned we cannot shut down SR-IOV without
* causing issues, so just leave the hardware available but
* disabled
*/
if (pci_vfs_assigned(pdev)) {
dev_warn(&pdev->dev, "Disabling while VFs assigned - VFs will not be deallocated\n");
mutex_unlock(&pf->lock);
return -EPERM;
}
@ -156,22 +160,12 @@ static int __nfp_pcie_sriov_disable(struct pci_dev *pdev)
pci_disable_sriov(pdev);
dev_dbg(&pdev->dev, "Removed VFs.\n");
mutex_unlock(&pf->lock);
#endif
return 0;
}
static int nfp_pcie_sriov_disable(struct pci_dev *pdev)
{
struct nfp_pf *pf = pci_get_drvdata(pdev);
int err;
mutex_lock(&pf->lock);
err = __nfp_pcie_sriov_disable(pdev);
mutex_unlock(&pf->lock);
return err;
}
static int nfp_pcie_sriov_configure(struct pci_dev *pdev, int num_vfs)
{
if (num_vfs == 0)
@ -471,11 +465,11 @@ static void nfp_pci_remove(struct pci_dev *pdev)
devlink = priv_to_devlink(pf);
nfp_net_pci_remove(pf);
nfp_pcie_sriov_disable(pdev);
pci_sriov_set_totalvfs(pf->pdev, 0);
nfp_net_pci_remove(pf);
devlink_unregister(devlink);
kfree(pf->rtbl);

10
drivers/net/ethernet/netronome/nfp/nfp_net_main.c
View File

@ -488,8 +488,16 @@ static int nfp_net_pf_app_start(struct nfp_pf *pf)
if (err)
goto err_ctrl_stop;
if (pf->num_vfs) {
err = nfp_app_sriov_enable(pf->app, pf->num_vfs);
if (err)
goto err_app_stop;
}
return 0;
err_app_stop:
nfp_app_stop(pf->app);
err_ctrl_stop:
nfp_net_pf_app_stop_ctrl(pf);
return err;
@ -497,6 +505,8 @@ err_ctrl_stop:
static void nfp_net_pf_app_stop(struct nfp_pf *pf)
{
if (pf->num_vfs)
nfp_app_sriov_disable(pf->app);
nfp_app_stop(pf->app);
nfp_net_pf_app_stop_ctrl(pf);
}