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 | |
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, nr_virtfn: 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 | |
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 | |
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, force: false); |
70 | else |
71 | return efx_ef100_pci_sriov_enable(efx, num_vfs); |
72 | } |
73 | |