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 <linux/mlx5/vport.h>
36 #include "mlx5_core.h"
37 #include "eswitch.h"
38
sriov_restore_guids(struct mlx5_core_dev * dev,int vf)39 static int sriov_restore_guids(struct mlx5_core_dev *dev, int vf)
40 {
41 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
42 struct mlx5_hca_vport_context *in;
43 int err = 0;
44
45 /* Restore sriov guid and policy settings */
46 if (sriov->vfs_ctx[vf].node_guid ||
47 sriov->vfs_ctx[vf].port_guid ||
48 sriov->vfs_ctx[vf].policy != MLX5_POLICY_INVALID) {
49 in = kzalloc(sizeof(*in), GFP_KERNEL);
50 if (!in)
51 return -ENOMEM;
52
53 in->node_guid = sriov->vfs_ctx[vf].node_guid;
54 in->port_guid = sriov->vfs_ctx[vf].port_guid;
55 in->policy = sriov->vfs_ctx[vf].policy;
56 in->field_select =
57 !!(in->port_guid) * MLX5_HCA_VPORT_SEL_PORT_GUID |
58 !!(in->node_guid) * MLX5_HCA_VPORT_SEL_NODE_GUID |
59 !!(in->policy) * MLX5_HCA_VPORT_SEL_STATE_POLICY;
60
61 err = mlx5_core_modify_hca_vport_context(dev, 1, 1, vf + 1, in);
62 if (err)
63 mlx5_core_warn(dev, "modify vport context failed, unable to restore VF %d settings\n", vf);
64
65 kfree(in);
66 }
67
68 return err;
69 }
70
mlx5_device_enable_sriov(struct mlx5_core_dev * dev,int num_vfs)71 static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
72 {
73 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
74 int err;
75 int vf;
76
77 if (!MLX5_ESWITCH_MANAGER(dev))
78 goto enable_vfs_hca;
79
80 mlx5_eswitch_update_num_of_vfs(dev->priv.eswitch, num_vfs);
81 err = mlx5_eswitch_enable(dev->priv.eswitch, MLX5_ESWITCH_LEGACY);
82 if (err) {
83 mlx5_core_warn(dev,
84 "failed to enable eswitch SRIOV (%d)\n", err);
85 return err;
86 }
87
88 enable_vfs_hca:
89 for (vf = 0; vf < num_vfs; vf++) {
90 err = mlx5_core_enable_hca(dev, vf + 1);
91 if (err) {
92 mlx5_core_warn(dev, "failed to enable VF %d (%d)\n", vf, err);
93 continue;
94 }
95 sriov->vfs_ctx[vf].enabled = 1;
96 if (MLX5_CAP_GEN(dev, port_type) == MLX5_CAP_PORT_TYPE_IB) {
97 err = sriov_restore_guids(dev, vf);
98 if (err) {
99 mlx5_core_warn(dev,
100 "failed to restore VF %d settings, err %d\n",
101 vf, err);
102 continue;
103 }
104 }
105 mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
106 }
107
108 return 0;
109 }
110
mlx5_device_disable_sriov(struct mlx5_core_dev * dev)111 static void mlx5_device_disable_sriov(struct mlx5_core_dev *dev)
112 {
113 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
114 int num_vfs = pci_num_vf(dev->pdev);
115 int err;
116 int vf;
117
118 for (vf = num_vfs - 1; vf >= 0; vf--) {
119 if (!sriov->vfs_ctx[vf].enabled)
120 continue;
121 err = mlx5_core_disable_hca(dev, vf + 1);
122 if (err) {
123 mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
124 continue;
125 }
126 sriov->vfs_ctx[vf].enabled = 0;
127 }
128
129 if (MLX5_ESWITCH_MANAGER(dev))
130 mlx5_eswitch_disable(dev->priv.eswitch);
131
132 if (mlx5_wait_for_pages(dev, &dev->priv.vfs_pages))
133 mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
134 }
135
mlx5_sriov_enable(struct pci_dev * pdev,int num_vfs)136 static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
137 {
138 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
139 int err;
140
141 err = mlx5_device_enable_sriov(dev, num_vfs);
142 if (err) {
143 mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
144 return err;
145 }
146
147 err = pci_enable_sriov(pdev, num_vfs);
148 if (err) {
149 mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
150 mlx5_device_disable_sriov(dev);
151 }
152 return err;
153 }
154
mlx5_sriov_disable(struct pci_dev * pdev)155 static void mlx5_sriov_disable(struct pci_dev *pdev)
156 {
157 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
158
159 pci_disable_sriov(pdev);
160 mlx5_device_disable_sriov(dev);
161 }
162
mlx5_core_sriov_configure(struct pci_dev * pdev,int num_vfs)163 int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
164 {
165 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
166 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
167 int err = 0;
168
169 mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
170
171 if (num_vfs)
172 err = mlx5_sriov_enable(pdev, num_vfs);
173 else
174 mlx5_sriov_disable(pdev);
175
176 if (!err)
177 sriov->num_vfs = num_vfs;
178 return err ? err : num_vfs;
179 }
180
mlx5_sriov_attach(struct mlx5_core_dev * dev)181 int mlx5_sriov_attach(struct mlx5_core_dev *dev)
182 {
183 if (!mlx5_core_is_pf(dev) || !pci_num_vf(dev->pdev))
184 return 0;
185
186 /* If sriov VFs exist in PCI level, enable them in device level */
187 return mlx5_device_enable_sriov(dev, pci_num_vf(dev->pdev));
188 }
189
mlx5_sriov_detach(struct mlx5_core_dev * dev)190 void mlx5_sriov_detach(struct mlx5_core_dev *dev)
191 {
192 if (!mlx5_core_is_pf(dev))
193 return;
194
195 mlx5_device_disable_sriov(dev);
196 }
197
mlx5_get_max_vfs(struct mlx5_core_dev * dev)198 static u16 mlx5_get_max_vfs(struct mlx5_core_dev *dev)
199 {
200 u16 host_total_vfs;
201 const u32 *out;
202
203 if (mlx5_core_is_ecpf_esw_manager(dev)) {
204 out = mlx5_esw_query_functions(dev);
205
206 /* Old FW doesn't support getting total_vfs from esw func
207 * but supports getting it from pci_sriov.
208 */
209 if (IS_ERR(out))
210 goto done;
211 host_total_vfs = MLX5_GET(query_esw_functions_out, out,
212 host_params_context.host_total_vfs);
213 kvfree(out);
214 if (host_total_vfs)
215 return host_total_vfs;
216 }
217
218 done:
219 return pci_sriov_get_totalvfs(dev->pdev);
220 }
221
mlx5_sriov_init(struct mlx5_core_dev * dev)222 int mlx5_sriov_init(struct mlx5_core_dev *dev)
223 {
224 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
225 struct pci_dev *pdev = dev->pdev;
226 int total_vfs;
227
228 if (!mlx5_core_is_pf(dev))
229 return 0;
230
231 total_vfs = pci_sriov_get_totalvfs(pdev);
232 sriov->max_vfs = mlx5_get_max_vfs(dev);
233 sriov->num_vfs = pci_num_vf(pdev);
234 sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
235 if (!sriov->vfs_ctx)
236 return -ENOMEM;
237
238 return 0;
239 }
240
mlx5_sriov_cleanup(struct mlx5_core_dev * dev)241 void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
242 {
243 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
244
245 if (!mlx5_core_is_pf(dev))
246 return;
247
248 kfree(sriov->vfs_ctx);
249 }
250
