+#define SRIOV_VALID_STATE(flags) (!!((flags) & MLX4_FLAG_SRIOV) ==\
+ !!((flags) & MLX4_FLAG_MASTER))
+
+static u64 mlx4_enable_sriov(struct mlx4_dev *dev, struct pci_dev *pdev,
+ u8 total_vfs, int existing_vfs)
+{
+ u64 dev_flags = dev->flags;
+
+ dev->dev_vfs = kzalloc(
+ total_vfs * sizeof(*dev->dev_vfs),
+ GFP_KERNEL);
+ if (NULL == dev->dev_vfs) {
+ mlx4_err(dev, "Failed to allocate memory for VFs\n");
+ goto disable_sriov;
+ } else if (!(dev->flags & MLX4_FLAG_SRIOV)) {
+ int err = 0;
+
+ atomic_inc(&pf_loading);
+ if (existing_vfs) {
+ if (existing_vfs != total_vfs)
+ mlx4_err(dev, "SR-IOV was already enabled, but with num_vfs (%d) different than requested (%d)\n",
+ existing_vfs, total_vfs);
+ } else {
+ mlx4_warn(dev, "Enabling SR-IOV with %d VFs\n", total_vfs);
+ err = pci_enable_sriov(pdev, total_vfs);
+ }
+ if (err) {
+ mlx4_err(dev, "Failed to enable SR-IOV, continuing without SR-IOV (err = %d)\n",
+ err);
+ atomic_dec(&pf_loading);
+ goto disable_sriov;
+ } else {
+ mlx4_warn(dev, "Running in master mode\n");
+ dev_flags |= MLX4_FLAG_SRIOV |
+ MLX4_FLAG_MASTER;
+ dev_flags &= ~MLX4_FLAG_SLAVE;
+ dev->num_vfs = total_vfs;
+ }
+ }
+ return dev_flags;
+
+disable_sriov:
+ dev->num_vfs = 0;
+ kfree(dev->dev_vfs);
+ return dev_flags & ~MLX4_FLAG_MASTER;
+}
+