cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ef100_sriov.c (1420B)

      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
     15static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
     16{
     17	struct pci_dev *dev = efx->pci_dev;
     18	int rc;
     19
     20	efx->vf_count = num_vfs;
     21	rc = pci_enable_sriov(dev, num_vfs);
     22	if (rc)
     23		goto fail;
     24
     25	return 0;
     26
     27fail:
     28	netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
     29	efx->vf_count = 0;
     30	return rc;
     31}
     32
     33int efx_ef100_pci_sriov_disable(struct efx_nic *efx)
     34{
     35	struct pci_dev *dev = efx->pci_dev;
     36	unsigned int vfs_assigned;
     37
     38	vfs_assigned = pci_vfs_assigned(dev);
     39	if (vfs_assigned) {
     40		netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
     41			   "please detach them before disabling SR-IOV\n");
     42		return -EBUSY;
     43	}
     44
     45	pci_disable_sriov(dev);
     46
     47	return 0;
     48}
     49
     50int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs)
     51{
     52	if (num_vfs == 0)
     53		return efx_ef100_pci_sriov_disable(efx);
     54	else
     55		return efx_ef100_pci_sriov_enable(efx, num_vfs);
     56}