ethernet/sfc/ef100_sriov.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /****************************************************************************
0003  * Driver for Solarflare network controllers and boards
0004  * Copyright 2019 Solarflare Communications Inc.
0005  * Copyright 2020-2022 Xilinx Inc.
0006  *
0007  * This program is free software; you can redistribute it and/or modify it
0008  * under the terms of the GNU General Public License version 2 as published
0009  * by the Free Software Foundation, incorporated herein by reference.
0010  */
0011
0012 #include "ef100_sriov.h"
0013 #include "ef100_nic.h"
0014 #include "ef100_rep.h"
0015
0016 static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
0017 {
0018     struct ef100_nic_data *nic_data = efx->nic_data;
0019     struct pci_dev *dev = efx->pci_dev;
0020     struct efx_rep *efv, *next;
0021     int rc, i;
0022
0023     efx->vf_count = num_vfs;
0024     rc = pci_enable_sriov(dev, num_vfs);
0025     if (rc)
0026         goto fail1;
0027
0028     if (!nic_data->grp_mae)
0029         return 0;
0030
0031     for (i = 0; i < num_vfs; i++) {
0032         rc = efx_ef100_vfrep_create(efx, i);
0033         if (rc)
0034             goto fail2;
0035     }
0036     return 0;
0037
0038 fail2:
0039     list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
0040         efx_ef100_vfrep_destroy(efx, efv);
0041     pci_disable_sriov(dev);
0042 fail1:
0043     netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
0044     efx->vf_count = 0;
0045     return rc;
0046 }
0047
0048 int efx_ef100_pci_sriov_disable(struct efx_nic *efx, bool force)
0049 {
0050     struct pci_dev *dev = efx->pci_dev;
0051     unsigned int vfs_assigned;
0052
0053     vfs_assigned = pci_vfs_assigned(dev);
0054     if (vfs_assigned && !force) {
0055         netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
0056                "please detach them before disabling SR-IOV\n");
0057         return -EBUSY;
0058     }
0059
0060     efx_ef100_fini_vfreps(efx);
0061     if (!vfs_assigned)
0062         pci_disable_sriov(dev);
0063     return 0;
0064 }
0065
0066 int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs)
0067 {
0068     if (num_vfs == 0)
0069         return efx_ef100_pci_sriov_disable(efx, false);
0070     else
0071         return efx_ef100_pci_sriov_enable(efx, num_vfs);
0072 }