drivers/net/ethernet/mellanox/mlx5/core/sriov.c

   1 /*
   2  * Copyright (c) 2014, Mellanox Technologies inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/pci.h>
  34 #include <linux/mlx5/driver.h>
  35 #include "mlx5_core.h"
  36 #ifdef CONFIG_MLX5_CORE_EN
  37 #include "eswitch.h"
  38 #endif
  39
  40 static void enable_vfs(struct mlx5_core_dev *dev, int num_vfs)
  41 {
  42         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  43         int err;
  44         int vf;
  45
  46         for (vf = 1; vf <= num_vfs; vf++) {
  47                 err = mlx5_core_enable_hca(dev, vf);
  48                 if (err) {
  49                         mlx5_core_warn(dev, "failed to enable VF %d\n", vf - 1);
  50                 } else {
  51                         sriov->vfs_ctx[vf - 1].enabled = 1;
  52                         mlx5_core_dbg(dev, "successfully enabled VF %d\n", vf - 1);
  53                 }
  54         }
  55 }
  56
  57 static void disable_vfs(struct mlx5_core_dev *dev, int num_vfs)
  58 {
  59         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  60         int vf;
  61
  62         for (vf = 1; vf <= num_vfs; vf++) {
  63                 if (sriov->vfs_ctx[vf - 1].enabled) {
  64                         if (mlx5_core_disable_hca(dev, vf))
  65                                 mlx5_core_warn(dev, "failed to disable VF %d\n", vf - 1);
  66                         else
  67                                 sriov->vfs_ctx[vf - 1].enabled = 0;
  68                 }
  69         }
  70 }
  71
  72 static int mlx5_core_create_vfs(struct pci_dev *pdev, int num_vfs)
  73 {
  74         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
  75         int err;
  76
  77         if (pci_num_vf(pdev))
  78                 pci_disable_sriov(pdev);
  79
  80         enable_vfs(dev, num_vfs);
  81
  82         err = pci_enable_sriov(pdev, num_vfs);
  83         if (err) {
  84                 dev_warn(&pdev->dev, "enable sriov failed %d\n", err);
  85                 goto ex;
  86         }
  87
  88         return 0;
  89
  90 ex:
  91         disable_vfs(dev, num_vfs);
  92         return err;
  93 }
  94
  95 static int mlx5_core_sriov_enable(struct pci_dev *pdev, int num_vfs)
  96 {
  97         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
  98         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  99         int err;
 100
 101         kfree(sriov->vfs_ctx);
 102         sriov->vfs_ctx = kcalloc(num_vfs, sizeof(*sriov->vfs_ctx), GFP_ATOMIC);
 103         if (!sriov->vfs_ctx)
 104                 return -ENOMEM;
 105
 106         sriov->enabled_vfs = num_vfs;
 107         err = mlx5_core_create_vfs(pdev, num_vfs);
 108         if (err) {
 109                 kfree(sriov->vfs_ctx);
 110                 sriov->vfs_ctx = NULL;
 111                 return err;
 112         }
 113
 114         return 0;
 115 }
 116
 117 static void mlx5_core_init_vfs(struct mlx5_core_dev *dev, int num_vfs)
 118 {
 119         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 120
 121         sriov->num_vfs = num_vfs;
 122 }
 123
 124 static void mlx5_core_cleanup_vfs(struct mlx5_core_dev *dev)
 125 {
 126         struct mlx5_core_sriov *sriov;
 127
 128         sriov = &dev->priv.sriov;
 129         disable_vfs(dev, sriov->num_vfs);
 130
 131         if (mlx5_wait_for_vf_pages(dev))
 132                 mlx5_core_warn(dev, "timeout claiming VFs pages\n");
 133
 134         sriov->num_vfs = 0;
 135 }
 136
 137 int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
 138 {
 139         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 140         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 141         int err;
 142
 143         mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
 144         if (!mlx5_core_is_pf(dev))
 145                 return -EPERM;
 146
 147         mlx5_core_cleanup_vfs(dev);
 148
 149         if (!num_vfs) {
 150 #ifdef CONFIG_MLX5_CORE_EN
 151                 mlx5_eswitch_disable_sriov(dev->priv.eswitch);
 152 #endif
 153                 kfree(sriov->vfs_ctx);
 154                 sriov->vfs_ctx = NULL;
 155                 if (!pci_vfs_assigned(pdev))
 156                         pci_disable_sriov(pdev);
 157                 else
 158                         pr_info("unloading PF driver while leaving orphan VFs\n");
 159                 return 0;
 160         }
 161
 162         err = mlx5_core_sriov_enable(pdev, num_vfs);
 163         if (err) {
 164                 dev_warn(&pdev->dev, "mlx5_core_sriov_enable failed %d\n", err);
 165                 return err;
 166         }
 167
 168         mlx5_core_init_vfs(dev, num_vfs);
 169 #ifdef CONFIG_MLX5_CORE_EN
 170         mlx5_eswitch_enable_sriov(dev->priv.eswitch, num_vfs, SRIOV_LEGACY);
 171 #endif
 172
 173         return num_vfs;
 174 }
 175
 176 static int sync_required(struct pci_dev *pdev)
 177 {
 178         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 179         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 180         int cur_vfs = pci_num_vf(pdev);
 181
 182         if (cur_vfs != sriov->num_vfs) {
 183                 pr_info("current VFs %d, registered %d - sync needed\n", cur_vfs, sriov->num_vfs);
 184                 return 1;
 185         }
 186
 187         return 0;
 188 }
 189
 190 int mlx5_sriov_init(struct mlx5_core_dev *dev)
 191 {
 192         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 193         struct pci_dev *pdev = dev->pdev;
 194         int cur_vfs;
 195
 196         if (!mlx5_core_is_pf(dev))
 197                 return 0;
 198
 199         if (!sync_required(dev->pdev))
 200                 return 0;
 201
 202         cur_vfs = pci_num_vf(pdev);
 203         sriov->vfs_ctx = kcalloc(cur_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
 204         if (!sriov->vfs_ctx)
 205                 return -ENOMEM;
 206
 207         sriov->enabled_vfs = cur_vfs;
 208
 209         mlx5_core_init_vfs(dev, cur_vfs);
 210 #ifdef CONFIG_MLX5_CORE_EN
 211         if (cur_vfs)
 212                 mlx5_eswitch_enable_sriov(dev->priv.eswitch, cur_vfs,
 213                                           SRIOV_LEGACY);
 214 #endif
 215
 216         enable_vfs(dev, cur_vfs);
 217
 218         return 0;
 219 }
 220
 221 int mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
 222 {
 223         struct pci_dev *pdev = dev->pdev;
 224         int err;
 225
 226         if (!mlx5_core_is_pf(dev))
 227                 return 0;
 228
 229         err = mlx5_core_sriov_configure(pdev, 0);
 230         if (err)
 231                 return err;
 232
 233         return 0;
 234 }