drivers/net/ethernet/sfc/ef100_sriov.c

   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, 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, false);
  70         else
  71                 return efx_ef100_pci_sriov_enable(efx, num_vfs);
  72 }