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 
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 
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 
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