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#include "ef100_rep.h"
15
16static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
17{
18	struct ef100_nic_data *nic_data = efx->nic_data;
19	struct pci_dev *dev = efx->pci_dev;
20	struct efx_rep *efv, *next;
21	int rc, i;
22
23	efx->vf_count = num_vfs;
24	rc = pci_enable_sriov(dev, num_vfs);
25	if (rc)
26		goto fail1;
27
28	if (!nic_data->grp_mae)
29		return 0;
30
31	for (i = 0; i < num_vfs; i++) {
32		rc = efx_ef100_vfrep_create(efx, i);
33		if (rc)
34			goto fail2;
35	}
36	return 0;
37
38fail2:
39	list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
40		efx_ef100_vfrep_destroy(efx, efv);
41	pci_disable_sriov(dev);
42fail1:
43	netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
44	efx->vf_count = 0;
45	return rc;
46}
47
48int efx_ef100_pci_sriov_disable(struct efx_nic *efx, bool force)
49{
50	struct pci_dev *dev = efx->pci_dev;
51	unsigned int vfs_assigned;
52
53	vfs_assigned = pci_vfs_assigned(dev);
54	if (vfs_assigned && !force) {
55		netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
56			   "please detach them before disabling SR-IOV\n");
57		return -EBUSY;
58	}
59
60	efx_ef100_fini_vfreps(efx);
61	if (!vfs_assigned)
62		pci_disable_sriov(dev);
63	return 0;
64}
65
66int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs)
67{
68	if (num_vfs == 0)
69		return efx_ef100_pci_sriov_disable(efx, false);
70	else
71		return efx_ef100_pci_sriov_enable(efx, num_vfs);
72}
73