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/*
* Copyright (c) 2014, Mellanox Technologies inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/pci.h>
#include <linux/mlx5/driver.h>
#include "mlx5_core.h"
#ifdef CONFIG_MLX5_CORE_EN
#include "eswitch.h"
#endif
bool mlx5_sriov_is_enabled(struct mlx5_core_dev *dev)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
return !!sriov->num_vfs;
}
static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
int err;
int vf;
if (sriov->enabled_vfs) {
mlx5_core_warn(dev,
"failed to enable SRIOV on device, already enabled with %d vfs\n",
sriov->enabled_vfs);
return -EBUSY;
}
#ifdef CONFIG_MLX5_CORE_EN
err = mlx5_eswitch_enable_sriov(dev->priv.eswitch, num_vfs, SRIOV_LEGACY);
if (err) {
mlx5_core_warn(dev,
"failed to enable eswitch SRIOV (%d)\n", err);
return err;
}
#endif
for (vf = 0; vf < num_vfs; vf++) {
err = mlx5_core_enable_hca(dev, vf + 1);
if (err) {
mlx5_core_warn(dev, "failed to enable VF %d (%d)\n", vf, err);
continue;
}
sriov->vfs_ctx[vf].enabled = 1;
sriov->enabled_vfs++;
mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
}
return 0;
}
static void mlx5_device_disable_sriov(struct mlx5_core_dev *dev)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
int err;
int vf;
if (!sriov->enabled_vfs)
#ifdef CONFIG_MLX5_CORE_EN
goto disable_sriov_resources;
#else
return;
#endif
for (vf = 0; vf < sriov->num_vfs; vf++) {
if (!sriov->vfs_ctx[vf].enabled)
continue;
err = mlx5_core_disable_hca(dev, vf + 1);
if (err) {
mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
continue;
}
sriov->vfs_ctx[vf].enabled = 0;
sriov->enabled_vfs--;
}
#ifdef CONFIG_MLX5_CORE_EN
disable_sriov_resources:
mlx5_eswitch_disable_sriov(dev->priv.eswitch);
#endif
if (mlx5_wait_for_vf_pages(dev))
mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
}
static int mlx5_pci_enable_sriov(struct pci_dev *pdev, int num_vfs)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
int err = 0;
if (pci_num_vf(pdev)) {
mlx5_core_warn(dev, "Unable to enable pci sriov, already enabled\n");
return -EBUSY;
}
err = pci_enable_sriov(pdev, num_vfs);
if (err)
mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
return err;
}
static void mlx5_pci_disable_sriov(struct pci_dev *pdev)
{
pci_disable_sriov(pdev);
}
static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
int err = 0;
err = mlx5_device_enable_sriov(dev, num_vfs);
if (err) {
mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
return err;
}
err = mlx5_pci_enable_sriov(pdev, num_vfs);
if (err) {
mlx5_core_warn(dev, "mlx5_pci_enable_sriov failed : %d\n", err);
mlx5_device_disable_sriov(dev);
return err;
}
sriov->num_vfs = num_vfs;
return 0;
}
static void mlx5_sriov_disable(struct pci_dev *pdev)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
mlx5_pci_disable_sriov(pdev);
mlx5_device_disable_sriov(dev);
sriov->num_vfs = 0;
}
int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
int err = 0;
mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
if (!mlx5_core_is_pf(dev))
return -EPERM;
if (num_vfs) {
int ret;
ret = mlx5_lag_forbid(dev);
if (ret && (ret != -ENODEV))
return ret;
}
if (num_vfs) {
err = mlx5_sriov_enable(pdev, num_vfs);
} else {
mlx5_sriov_disable(pdev);
mlx5_lag_allow(dev);
}
return err ? err : num_vfs;
}
int mlx5_sriov_attach(struct mlx5_core_dev *dev)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
if (!mlx5_core_is_pf(dev) || !sriov->num_vfs)
return 0;
/* If sriov VFs exist in PCI level, enable them in device level */
return mlx5_device_enable_sriov(dev, sriov->num_vfs);
}
void mlx5_sriov_detach(struct mlx5_core_dev *dev)
{
if (!mlx5_core_is_pf(dev))
return;
mlx5_device_disable_sriov(dev);
}
int mlx5_sriov_init(struct mlx5_core_dev *dev)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
struct pci_dev *pdev = dev->pdev;
int total_vfs;
if (!mlx5_core_is_pf(dev))
return 0;
total_vfs = pci_sriov_get_totalvfs(pdev);
sriov->num_vfs = pci_num_vf(pdev);
sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
if (!sriov->vfs_ctx)
return -ENOMEM;
return 0;
}
void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
{
struct mlx5_core_sriov *sriov = &dev->priv.sriov;
if (!mlx5_core_is_pf(dev))
return;
kfree(sriov->vfs_ctx);
}
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