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
efx_ef100_pci_sriov_enable(struct efx_nic * efx,int num_vfs)16 static 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
38 fail2:
39 list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
40 efx_ef100_vfrep_destroy(efx, efv);
41 pci_disable_sriov(dev);
42 fail1:
43 netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
44 efx->vf_count = 0;
45 return rc;
46 }
47
efx_ef100_pci_sriov_disable(struct efx_nic * efx,bool force)48 int 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
efx_ef100_sriov_configure(struct efx_nic * efx,int num_vfs)66 int 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