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net/mlx5: Read num_vfs before disabling SR-IOV 

mlx5_device_disable_sriov() currently reads num_vfs from the PCI core.
However when mlx5_device_disable_sriov() is executed, SR-IOV is
already disabled at the PCI level.
Due to this disable_hca() cleanup is not done during SR-IOV disable
flow.

mlx5_sriov_disable()
  pci_enable_sriov()
  mlx5_device_disable_sriov() <- num_vfs is zero here.

When SR-IOV enablement fails during mlx5_sriov_enable(), HCA's are left
in enabled stage because mlx5_device_disable_sriov() relies on num_vfs
from PCI core.

mlx5_sriov_enable()
  mlx5_device_enable_sriov()
  pci_enable_sriov() <- Fails

Hence, to overcome above issues,
(a) Read num_vfs before disabling SR-IOV and use it.
(b) Use num_vfs given when enabling sriov in error unwinding path.

Fixes: d886aba677 ("net/mlx5: Reduce dependency on enabled_vfs counter and num_vfs")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Parav Pandit 2019-10-28 13:29:17 -05:00 committed by Saeed Mahameed
parent 86bb811b08
commit a7cba0a4d5
1 changed files with 6 additions and 5 deletions
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11
drivers/net/ethernet/mellanox/mlx5/core/sriov.c
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@ -108,10 +108,10 @@ static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
return 0;
}
static void mlx5_device_disable_sriov(struct mlx5_core_dev *dev, bool clear_vf)
static void
mlx5_device_disable_sriov(struct mlx5_core_dev *dev, int num_vfs, bool clear_vf)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
int num_vfs = pci_num_vf(dev->pdev);
int err;
int vf;
@ -147,7 +147,7 @@ static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
err = pci_enable_sriov(pdev, num_vfs);
if (err) {
mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
mlx5_device_disable_sriov(dev, true);
mlx5_device_disable_sriov(dev, num_vfs, true);
}
return err;
}
@ -155,9 +155,10 @@ static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
static void mlx5_sriov_disable(struct pci_dev *pdev)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
int num_vfs = pci_num_vf(dev->pdev);
pci_disable_sriov(pdev);
mlx5_device_disable_sriov(dev, true);
mlx5_device_disable_sriov(dev, num_vfs, true);
}
int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
@ -192,7 +193,7 @@ void mlx5_sriov_detach(struct mlx5_core_dev *dev)
if (!mlx5_core_is_pf(dev))
return;
mlx5_device_disable_sriov(dev, false);
mlx5_device_disable_sriov(dev, pci_num_vf(dev->pdev), false);
}
static u16 mlx5_get_max_vfs(struct mlx5_core_dev *dev)