/*
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* Copyright (c) 2014, Mellanox Technologies inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/pci.h>
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#include <linux/mlx5/driver.h>
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#include <linux/mlx5/vport.h>
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#include "mlx5_core.h"
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#include "eswitch.h"
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static int sriov_restore_guids(struct mlx5_core_dev *dev, int vf)
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{
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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struct mlx5_hca_vport_context *in;
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int err = 0;
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/* Restore sriov guid and policy settings */
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if (sriov->vfs_ctx[vf].node_guid ||
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sriov->vfs_ctx[vf].port_guid ||
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sriov->vfs_ctx[vf].policy != MLX5_POLICY_INVALID) {
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in = kzalloc(sizeof(*in), GFP_KERNEL);
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if (!in)
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return -ENOMEM;
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in->node_guid = sriov->vfs_ctx[vf].node_guid;
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in->port_guid = sriov->vfs_ctx[vf].port_guid;
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in->policy = sriov->vfs_ctx[vf].policy;
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in->field_select =
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!!(in->port_guid) * MLX5_HCA_VPORT_SEL_PORT_GUID |
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!!(in->node_guid) * MLX5_HCA_VPORT_SEL_NODE_GUID |
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!!(in->policy) * MLX5_HCA_VPORT_SEL_STATE_POLICY;
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err = mlx5_core_modify_hca_vport_context(dev, 1, 1, vf + 1, in);
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if (err)
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mlx5_core_warn(dev, "modify vport context failed, unable to restore VF %d settings\n", vf);
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kfree(in);
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}
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return err;
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}
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static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
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{
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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int err;
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int vf;
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if (!MLX5_ESWITCH_MANAGER(dev))
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goto enable_vfs_hca;
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err = mlx5_eswitch_enable(dev->priv.eswitch, num_vfs);
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if (err) {
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mlx5_core_warn(dev,
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"failed to enable eswitch SRIOV (%d)\n", err);
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return err;
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}
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enable_vfs_hca:
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for (vf = 0; vf < num_vfs; vf++) {
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err = mlx5_core_enable_hca(dev, vf + 1);
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if (err) {
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mlx5_core_warn(dev, "failed to enable VF %d (%d)\n", vf, err);
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continue;
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}
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sriov->vfs_ctx[vf].enabled = 1;
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if (MLX5_CAP_GEN(dev, port_type) == MLX5_CAP_PORT_TYPE_IB) {
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err = sriov_restore_guids(dev, vf);
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if (err) {
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mlx5_core_warn(dev,
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"failed to restore VF %d settings, err %d\n",
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vf, err);
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continue;
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}
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}
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mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
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}
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return 0;
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}
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static void
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mlx5_device_disable_sriov(struct mlx5_core_dev *dev, int num_vfs, bool clear_vf)
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{
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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int err;
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int vf;
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for (vf = num_vfs - 1; vf >= 0; vf--) {
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if (!sriov->vfs_ctx[vf].enabled)
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continue;
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err = mlx5_core_disable_hca(dev, vf + 1);
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if (err) {
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mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
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continue;
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}
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sriov->vfs_ctx[vf].enabled = 0;
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}
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if (MLX5_ESWITCH_MANAGER(dev))
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mlx5_eswitch_disable(dev->priv.eswitch, clear_vf);
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if (mlx5_wait_for_pages(dev, &dev->priv.vfs_pages))
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mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
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}
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static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
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{
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struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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int err;
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err = mlx5_device_enable_sriov(dev, num_vfs);
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if (err) {
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mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
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return err;
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}
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err = pci_enable_sriov(pdev, num_vfs);
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if (err) {
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mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
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mlx5_device_disable_sriov(dev, num_vfs, true);
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}
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return err;
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}
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static void mlx5_sriov_disable(struct pci_dev *pdev)
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{
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struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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int num_vfs = pci_num_vf(dev->pdev);
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pci_disable_sriov(pdev);
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mlx5_device_disable_sriov(dev, num_vfs, true);
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}
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int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
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{
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struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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int err = 0;
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mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
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if (num_vfs)
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err = mlx5_sriov_enable(pdev, num_vfs);
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else
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mlx5_sriov_disable(pdev);
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if (!err)
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sriov->num_vfs = num_vfs;
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return err ? err : num_vfs;
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}
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int mlx5_sriov_attach(struct mlx5_core_dev *dev)
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{
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if (!mlx5_core_is_pf(dev) || !pci_num_vf(dev->pdev))
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return 0;
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/* If sriov VFs exist in PCI level, enable them in device level */
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return mlx5_device_enable_sriov(dev, pci_num_vf(dev->pdev));
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}
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void mlx5_sriov_detach(struct mlx5_core_dev *dev)
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{
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if (!mlx5_core_is_pf(dev))
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return;
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mlx5_device_disable_sriov(dev, pci_num_vf(dev->pdev), false);
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}
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static u16 mlx5_get_max_vfs(struct mlx5_core_dev *dev)
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{
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u16 host_total_vfs;
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const u32 *out;
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if (mlx5_core_is_ecpf_esw_manager(dev)) {
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out = mlx5_esw_query_functions(dev);
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/* Old FW doesn't support getting total_vfs from esw func
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* but supports getting it from pci_sriov.
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*/
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if (IS_ERR(out))
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goto done;
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host_total_vfs = MLX5_GET(query_esw_functions_out, out,
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host_params_context.host_total_vfs);
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kvfree(out);
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return host_total_vfs;
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}
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done:
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return pci_sriov_get_totalvfs(dev->pdev);
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}
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int mlx5_sriov_init(struct mlx5_core_dev *dev)
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{
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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struct pci_dev *pdev = dev->pdev;
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int total_vfs;
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if (!mlx5_core_is_pf(dev))
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return 0;
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total_vfs = pci_sriov_get_totalvfs(pdev);
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sriov->max_vfs = mlx5_get_max_vfs(dev);
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sriov->num_vfs = pci_num_vf(pdev);
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sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
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if (!sriov->vfs_ctx)
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return -ENOMEM;
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return 0;
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}
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void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
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{
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struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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if (!mlx5_core_is_pf(dev))
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return;
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kfree(sriov->vfs_ctx);
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}
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