1 // SPDX-License-Identifier: GPL-2.0-only
2 /****************************************************************************
3 * Driver for Solarflare network controllers and boards
4 * Copyright 2019 Solarflare Communications Inc.
5 * Copyright 2020-2022 Xilinx Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation, incorporated herein by reference.
10 */
11
12 #include "ef100_sriov.h"
13 #include "ef100_nic.h"
14
efx_ef100_pci_sriov_enable(struct efx_nic * efx,int num_vfs)15 static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
16 {
17 struct pci_dev *dev = efx->pci_dev;
18 int rc;
19
20 efx->vf_count = num_vfs;
21 rc = pci_enable_sriov(dev, num_vfs);
22 if (rc)
23 goto fail;
24
25 return 0;
26
27 fail:
28 netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
29 efx->vf_count = 0;
30 return rc;
31 }
32
efx_ef100_pci_sriov_disable(struct efx_nic * efx)33 int efx_ef100_pci_sriov_disable(struct efx_nic *efx)
34 {
35 struct pci_dev *dev = efx->pci_dev;
36 unsigned int vfs_assigned;
37
38 vfs_assigned = pci_vfs_assigned(dev);
39 if (vfs_assigned) {
40 netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
41 "please detach them before disabling SR-IOV\n");
42 return -EBUSY;
43 }
44
45 pci_disable_sriov(dev);
46
47 return 0;
48 }
49
efx_ef100_sriov_configure(struct efx_nic * efx,int num_vfs)50 int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs)
51 {
52 if (num_vfs == 0)
53 return efx_ef100_pci_sriov_disable(efx);
54 else
55 return efx_ef100_pci_sriov_enable(efx, num_vfs);
56 }
57