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 bool mlx5_sriov_is_enabled(struct mlx5_core_dev *dev)
  41 {
  42         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  43
  44         return !!sriov->num_vfs;
  45 }
  46
  47 static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
  48 {
  49         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  50         int err;
  51         int vf;
  52
  53         if (sriov->enabled_vfs) {
  54                 mlx5_core_warn(dev,
  55                                "failed to enable SRIOV on device, already enabled with %d vfs\n",
  56                                sriov->enabled_vfs);
  57                 return -EBUSY;
  58         }
  59
  60 #ifdef CONFIG_MLX5_CORE_EN
  61         err = mlx5_eswitch_enable_sriov(dev->priv.eswitch, num_vfs, SRIOV_LEGACY);
  62         if (err) {
  63                 mlx5_core_warn(dev,
  64                                "failed to enable eswitch SRIOV (%d)\n", err);
  65                 return err;
  66         }
  67 #endif
  68
  69         for (vf = 0; vf < num_vfs; vf++) {
  70                 err = mlx5_core_enable_hca(dev, vf + 1);
  71                 if (err) {
  72                         mlx5_core_warn(dev, "failed to enable VF %d (%d)\n", vf, err);
  73                         continue;
  74                 }
  75                 sriov->vfs_ctx[vf].enabled = 1;
  76                 sriov->enabled_vfs++;
  77                 mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
  78
  79         }
  80
  81         return 0;
  82 }
  83
  84 static void mlx5_device_disable_sriov(struct mlx5_core_dev *dev)
  85 {
  86         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
  87         int err;
  88         int vf;
  89
  90         if (!sriov->enabled_vfs)
  91 #ifdef CONFIG_MLX5_CORE_EN
  92                 goto disable_sriov_resources;
  93 #else
  94                 return;
  95 #endif
  96
  97         for (vf = 0; vf < sriov->num_vfs; vf++) {
  98                 if (!sriov->vfs_ctx[vf].enabled)
  99                         continue;
 100                 err = mlx5_core_disable_hca(dev, vf + 1);
 101                 if (err) {
 102                         mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
 103                         continue;
 104                 }
 105                 sriov->vfs_ctx[vf].enabled = 0;
 106                 sriov->enabled_vfs--;
 107         }
 108
 109 #ifdef CONFIG_MLX5_CORE_EN
 110 disable_sriov_resources:
 111         mlx5_eswitch_disable_sriov(dev->priv.eswitch);
 112 #endif
 113
 114         if (mlx5_wait_for_vf_pages(dev))
 115                 mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
 116 }
 117
 118 static int mlx5_pci_enable_sriov(struct pci_dev *pdev, int num_vfs)
 119 {
 120         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 121         int err = 0;
 122
 123         if (pci_num_vf(pdev)) {
 124                 mlx5_core_warn(dev, "Unable to enable pci sriov, already enabled\n");
 125                 return -EBUSY;
 126         }
 127
 128         err = pci_enable_sriov(pdev, num_vfs);
 129         if (err)
 130                 mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
 131
 132         return err;
 133 }
 134
 135 static void mlx5_pci_disable_sriov(struct pci_dev *pdev)
 136 {
 137         pci_disable_sriov(pdev);
 138 }
 139
 140 static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
 141 {
 142         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 143         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 144         int err = 0;
 145
 146         err = mlx5_device_enable_sriov(dev, num_vfs);
 147         if (err) {
 148                 mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
 149                 return err;
 150         }
 151
 152         err = mlx5_pci_enable_sriov(pdev, num_vfs);
 153         if (err) {
 154                 mlx5_core_warn(dev, "mlx5_pci_enable_sriov failed : %d\n", err);
 155                 mlx5_device_disable_sriov(dev);
 156                 return err;
 157         }
 158
 159         sriov->num_vfs = num_vfs;
 160
 161         return 0;
 162 }
 163
 164 static void mlx5_sriov_disable(struct pci_dev *pdev)
 165 {
 166         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 167         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 168
 169         mlx5_pci_disable_sriov(pdev);
 170         mlx5_device_disable_sriov(dev);
 171         sriov->num_vfs = 0;
 172 }
 173
 174 int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
 175 {
 176         struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
 177         int err = 0;
 178
 179         mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
 180         if (!mlx5_core_is_pf(dev))
 181                 return -EPERM;
 182
 183         if (num_vfs) {
 184                 int ret;
 185
 186                 ret = mlx5_lag_forbid(dev);
 187                 if (ret && (ret != -ENODEV))
 188                         return ret;
 189         }
 190
 191         if (num_vfs) {
 192                 err = mlx5_sriov_enable(pdev, num_vfs);
 193         } else {
 194                 mlx5_sriov_disable(pdev);
 195                 mlx5_lag_allow(dev);
 196         }
 197
 198         return err ? err : num_vfs;
 199 }
 200
 201 int mlx5_sriov_attach(struct mlx5_core_dev *dev)
 202 {
 203         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 204
 205         if (!mlx5_core_is_pf(dev) || !sriov->num_vfs)
 206                 return 0;
 207
 208         /* If sriov VFs exist in PCI level, enable them in device level */
 209         return mlx5_device_enable_sriov(dev, sriov->num_vfs);
 210 }
 211
 212 void mlx5_sriov_detach(struct mlx5_core_dev *dev)
 213 {
 214         if (!mlx5_core_is_pf(dev))
 215                 return;
 216
 217         mlx5_device_disable_sriov(dev);
 218 }
 219
 220 int mlx5_sriov_init(struct mlx5_core_dev *dev)
 221 {
 222         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 223         struct pci_dev *pdev = dev->pdev;
 224         int total_vfs;
 225
 226         if (!mlx5_core_is_pf(dev))
 227                 return 0;
 228
 229         total_vfs = pci_sriov_get_totalvfs(pdev);
 230         sriov->num_vfs = pci_num_vf(pdev);
 231         sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
 232         if (!sriov->vfs_ctx)
 233                 return -ENOMEM;
 234
 235         return 0;
 236 }
 237
 238 void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
 239 {
 240         struct mlx5_core_sriov *sriov = &dev->priv.sriov;
 241
 242         if (!mlx5_core_is_pf(dev))
 243                 return;
 244
 245         kfree(sriov->vfs_ctx);
 246 }