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 "mlx5_irq.h"
38 #include "eswitch.h"
39
sriov_restore_guids(struct mlx5_core_dev * dev,int vf)40 static int sriov_restore_guids(struct mlx5_core_dev *dev, int vf)
41 {
42 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
43 struct mlx5_hca_vport_context *in;
44 int err = 0;
45
46 /* Restore sriov guid and policy settings */
47 if (sriov->vfs_ctx[vf].node_guid ||
48 sriov->vfs_ctx[vf].port_guid ||
49 sriov->vfs_ctx[vf].policy != MLX5_POLICY_INVALID) {
50 in = kzalloc(sizeof(*in), GFP_KERNEL);
51 if (!in)
52 return -ENOMEM;
53
54 in->node_guid = sriov->vfs_ctx[vf].node_guid;
55 in->port_guid = sriov->vfs_ctx[vf].port_guid;
56 in->policy = sriov->vfs_ctx[vf].policy;
57 in->field_select =
58 !!(in->port_guid) * MLX5_HCA_VPORT_SEL_PORT_GUID |
59 !!(in->node_guid) * MLX5_HCA_VPORT_SEL_NODE_GUID |
60 !!(in->policy) * MLX5_HCA_VPORT_SEL_STATE_POLICY;
61
62 err = mlx5_core_modify_hca_vport_context(dev, 1, 1, vf + 1, in);
63 if (err)
64 mlx5_core_warn(dev, "modify vport context failed, unable to restore VF %d settings\n", vf);
65
66 kfree(in);
67 }
68
69 return err;
70 }
71
mlx5_device_enable_sriov(struct mlx5_core_dev * dev,int num_vfs)72 static int mlx5_device_enable_sriov(struct mlx5_core_dev *dev, int num_vfs)
73 {
74 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
75 int err, vf, num_msix_count;
76
77 if (!MLX5_ESWITCH_MANAGER(dev))
78 goto enable_vfs_hca;
79
80 err = mlx5_eswitch_enable(dev->priv.eswitch, num_vfs);
81 if (err) {
82 mlx5_core_warn(dev,
83 "failed to enable eswitch SRIOV (%d)\n", err);
84 return err;
85 }
86
87 enable_vfs_hca:
88 num_msix_count = mlx5_get_default_msix_vec_count(dev, num_vfs);
89 for (vf = 0; vf < num_vfs; vf++) {
90 /* Notify the VF before its enablement to let it set
91 * some stuff.
92 */
93 blocking_notifier_call_chain(&sriov->vfs_ctx[vf].notifier,
94 MLX5_PF_NOTIFY_ENABLE_VF, dev);
95 err = mlx5_core_enable_hca(dev, vf + 1);
96 if (err) {
97 mlx5_core_warn(dev, "failed to enable VF %d (%d)\n", vf, err);
98 continue;
99 }
100
101 err = mlx5_set_msix_vec_count(dev, vf + 1, num_msix_count);
102 if (err) {
103 mlx5_core_warn(dev,
104 "failed to set MSI-X vector counts VF %d, err %d\n",
105 vf, err);
106 continue;
107 }
108
109 sriov->vfs_ctx[vf].enabled = 1;
110 if (MLX5_CAP_GEN(dev, port_type) == MLX5_CAP_PORT_TYPE_IB) {
111 err = sriov_restore_guids(dev, vf);
112 if (err) {
113 mlx5_core_warn(dev,
114 "failed to restore VF %d settings, err %d\n",
115 vf, err);
116 continue;
117 }
118 }
119 mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
120 }
121
122 return 0;
123 }
124
125 static void
mlx5_device_disable_sriov(struct mlx5_core_dev * dev,int num_vfs,bool clear_vf)126 mlx5_device_disable_sriov(struct mlx5_core_dev *dev, int num_vfs, bool clear_vf)
127 {
128 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
129 int err;
130 int vf;
131
132 for (vf = num_vfs - 1; vf >= 0; vf--) {
133 if (!sriov->vfs_ctx[vf].enabled)
134 continue;
135 /* Notify the VF before its disablement to let it clean
136 * some resources.
137 */
138 blocking_notifier_call_chain(&sriov->vfs_ctx[vf].notifier,
139 MLX5_PF_NOTIFY_DISABLE_VF, dev);
140 err = mlx5_core_disable_hca(dev, vf + 1);
141 if (err) {
142 mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
143 continue;
144 }
145 sriov->vfs_ctx[vf].enabled = 0;
146 }
147
148 mlx5_eswitch_disable_sriov(dev->priv.eswitch, clear_vf);
149
150 if (mlx5_wait_for_pages(dev, &dev->priv.vfs_pages))
151 mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
152 }
153
mlx5_sriov_enable(struct pci_dev * pdev,int num_vfs)154 static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
155 {
156 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
157 struct devlink *devlink = priv_to_devlink(dev);
158 int err;
159
160 devl_lock(devlink);
161 err = mlx5_device_enable_sriov(dev, num_vfs);
162 devl_unlock(devlink);
163 if (err) {
164 mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
165 return err;
166 }
167
168 err = pci_enable_sriov(pdev, num_vfs);
169 if (err) {
170 mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
171 mlx5_device_disable_sriov(dev, num_vfs, true);
172 }
173 return err;
174 }
175
mlx5_sriov_disable(struct pci_dev * pdev)176 void mlx5_sriov_disable(struct pci_dev *pdev)
177 {
178 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
179 struct devlink *devlink = priv_to_devlink(dev);
180 int num_vfs = pci_num_vf(dev->pdev);
181
182 pci_disable_sriov(pdev);
183 devl_lock(devlink);
184 mlx5_device_disable_sriov(dev, num_vfs, true);
185 devl_unlock(devlink);
186 }
187
mlx5_core_sriov_configure(struct pci_dev * pdev,int num_vfs)188 int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
189 {
190 struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
191 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
192 int err = 0;
193
194 mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
195
196 if (num_vfs)
197 err = mlx5_sriov_enable(pdev, num_vfs);
198 else
199 mlx5_sriov_disable(pdev);
200
201 if (!err)
202 sriov->num_vfs = num_vfs;
203 return err ? err : num_vfs;
204 }
205
mlx5_core_sriov_set_msix_vec_count(struct pci_dev * vf,int msix_vec_count)206 int mlx5_core_sriov_set_msix_vec_count(struct pci_dev *vf, int msix_vec_count)
207 {
208 struct pci_dev *pf = pci_physfn(vf);
209 struct mlx5_core_sriov *sriov;
210 struct mlx5_core_dev *dev;
211 int num_vf_msix, id;
212
213 dev = pci_get_drvdata(pf);
214 num_vf_msix = MLX5_CAP_GEN_MAX(dev, num_total_dynamic_vf_msix);
215 if (!num_vf_msix)
216 return -EOPNOTSUPP;
217
218 if (!msix_vec_count)
219 msix_vec_count =
220 mlx5_get_default_msix_vec_count(dev, pci_num_vf(pf));
221
222 sriov = &dev->priv.sriov;
223 id = pci_iov_vf_id(vf);
224 if (id < 0 || !sriov->vfs_ctx[id].enabled)
225 return -EINVAL;
226
227 return mlx5_set_msix_vec_count(dev, id + 1, msix_vec_count);
228 }
229
mlx5_sriov_attach(struct mlx5_core_dev * dev)230 int mlx5_sriov_attach(struct mlx5_core_dev *dev)
231 {
232 if (!mlx5_core_is_pf(dev) || !pci_num_vf(dev->pdev))
233 return 0;
234
235 /* If sriov VFs exist in PCI level, enable them in device level */
236 return mlx5_device_enable_sriov(dev, pci_num_vf(dev->pdev));
237 }
238
mlx5_sriov_detach(struct mlx5_core_dev * dev)239 void mlx5_sriov_detach(struct mlx5_core_dev *dev)
240 {
241 if (!mlx5_core_is_pf(dev))
242 return;
243
244 mlx5_device_disable_sriov(dev, pci_num_vf(dev->pdev), false);
245 }
246
mlx5_get_max_vfs(struct mlx5_core_dev * dev)247 static u16 mlx5_get_max_vfs(struct mlx5_core_dev *dev)
248 {
249 u16 host_total_vfs;
250 const u32 *out;
251
252 if (mlx5_core_is_ecpf_esw_manager(dev)) {
253 out = mlx5_esw_query_functions(dev);
254
255 /* Old FW doesn't support getting total_vfs from esw func
256 * but supports getting it from pci_sriov.
257 */
258 if (IS_ERR(out))
259 goto done;
260 host_total_vfs = MLX5_GET(query_esw_functions_out, out,
261 host_params_context.host_total_vfs);
262 kvfree(out);
263 if (host_total_vfs)
264 return host_total_vfs;
265 }
266
267 done:
268 return pci_sriov_get_totalvfs(dev->pdev);
269 }
270
mlx5_sriov_init(struct mlx5_core_dev * dev)271 int mlx5_sriov_init(struct mlx5_core_dev *dev)
272 {
273 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
274 struct pci_dev *pdev = dev->pdev;
275 int total_vfs, i;
276
277 if (!mlx5_core_is_pf(dev))
278 return 0;
279
280 total_vfs = pci_sriov_get_totalvfs(pdev);
281 sriov->max_vfs = mlx5_get_max_vfs(dev);
282 sriov->num_vfs = pci_num_vf(pdev);
283 sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
284 if (!sriov->vfs_ctx)
285 return -ENOMEM;
286
287 for (i = 0; i < total_vfs; i++)
288 BLOCKING_INIT_NOTIFIER_HEAD(&sriov->vfs_ctx[i].notifier);
289
290 return 0;
291 }
292
mlx5_sriov_cleanup(struct mlx5_core_dev * dev)293 void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
294 {
295 struct mlx5_core_sriov *sriov = &dev->priv.sriov;
296
297 if (!mlx5_core_is_pf(dev))
298 return;
299
300 kfree(sriov->vfs_ctx);
301 }
302
303 /**
304 * mlx5_sriov_blocking_notifier_unregister - Unregister a VF from
305 * a notification block chain.
306 *
307 * @mdev: The mlx5 core device.
308 * @vf_id: The VF id.
309 * @nb: The notifier block to be unregistered.
310 */
mlx5_sriov_blocking_notifier_unregister(struct mlx5_core_dev * mdev,int vf_id,struct notifier_block * nb)311 void mlx5_sriov_blocking_notifier_unregister(struct mlx5_core_dev *mdev,
312 int vf_id,
313 struct notifier_block *nb)
314 {
315 struct mlx5_vf_context *vfs_ctx;
316 struct mlx5_core_sriov *sriov;
317
318 sriov = &mdev->priv.sriov;
319 if (WARN_ON(vf_id < 0 || vf_id >= sriov->num_vfs))
320 return;
321
322 vfs_ctx = &sriov->vfs_ctx[vf_id];
323 blocking_notifier_chain_unregister(&vfs_ctx->notifier, nb);
324 }
325 EXPORT_SYMBOL(mlx5_sriov_blocking_notifier_unregister);
326
327 /**
328 * mlx5_sriov_blocking_notifier_register - Register a VF notification
329 * block chain.
330 *
331 * @mdev: The mlx5 core device.
332 * @vf_id: The VF id.
333 * @nb: The notifier block to be called upon the VF events.
334 *
335 * Returns 0 on success or an error code.
336 */
mlx5_sriov_blocking_notifier_register(struct mlx5_core_dev * mdev,int vf_id,struct notifier_block * nb)337 int mlx5_sriov_blocking_notifier_register(struct mlx5_core_dev *mdev,
338 int vf_id,
339 struct notifier_block *nb)
340 {
341 struct mlx5_vf_context *vfs_ctx;
342 struct mlx5_core_sriov *sriov;
343
344 sriov = &mdev->priv.sriov;
345 if (vf_id < 0 || vf_id >= sriov->num_vfs)
346 return -EINVAL;
347
348 vfs_ctx = &sriov->vfs_ctx[vf_id];
349 return blocking_notifier_chain_register(&vfs_ctx->notifier, nb);
350 }
351 EXPORT_SYMBOL(mlx5_sriov_blocking_notifier_register);
352