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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 		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 
96 		err = mlx5_set_msix_vec_count(dev, vf + 1, num_msix_count);
97 		if (err) {
98 			mlx5_core_warn(dev,
99 				       "failed to set MSI-X vector counts VF %d, err %d\n",
100 				       vf, err);
101 			continue;
102 		}
103 
104 		sriov->vfs_ctx[vf].enabled = 1;
105 		if (MLX5_CAP_GEN(dev, port_type) == MLX5_CAP_PORT_TYPE_IB) {
106 			err = sriov_restore_guids(dev, vf);
107 			if (err) {
108 				mlx5_core_warn(dev,
109 					       "failed to restore VF %d settings, err %d\n",
110 					       vf, err);
111 				continue;
112 			}
113 		}
114 		mlx5_core_dbg(dev, "successfully enabled VF* %d\n", vf);
115 	}
116 
117 	return 0;
118 }
119 
120 static void
mlx5_device_disable_sriov(struct mlx5_core_dev * dev,int num_vfs,bool clear_vf)121 mlx5_device_disable_sriov(struct mlx5_core_dev *dev, int num_vfs, bool clear_vf)
122 {
123 	struct mlx5_core_sriov *sriov = &dev->priv.sriov;
124 	int err;
125 	int vf;
126 
127 	for (vf = num_vfs - 1; vf >= 0; vf--) {
128 		if (!sriov->vfs_ctx[vf].enabled)
129 			continue;
130 		err = mlx5_core_disable_hca(dev, vf + 1);
131 		if (err) {
132 			mlx5_core_warn(dev, "failed to disable VF %d\n", vf);
133 			continue;
134 		}
135 		sriov->vfs_ctx[vf].enabled = 0;
136 	}
137 
138 	if (MLX5_ESWITCH_MANAGER(dev))
139 		mlx5_eswitch_disable(dev->priv.eswitch, clear_vf);
140 
141 	if (mlx5_wait_for_pages(dev, &dev->priv.vfs_pages))
142 		mlx5_core_warn(dev, "timeout reclaiming VFs pages\n");
143 }
144 
mlx5_sriov_enable(struct pci_dev * pdev,int num_vfs)145 static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
146 {
147 	struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
148 	int err;
149 
150 	err = mlx5_device_enable_sriov(dev, num_vfs);
151 	if (err) {
152 		mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
153 		return err;
154 	}
155 
156 	err = pci_enable_sriov(pdev, num_vfs);
157 	if (err) {
158 		mlx5_core_warn(dev, "pci_enable_sriov failed : %d\n", err);
159 		mlx5_device_disable_sriov(dev, num_vfs, true);
160 	}
161 	return err;
162 }
163 
mlx5_sriov_disable(struct pci_dev * pdev)164 static void mlx5_sriov_disable(struct pci_dev *pdev)
165 {
166 	struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
167 	int num_vfs = pci_num_vf(dev->pdev);
168 
169 	pci_disable_sriov(pdev);
170 	mlx5_device_disable_sriov(dev, num_vfs, true);
171 }
172 
mlx5_core_sriov_configure(struct pci_dev * pdev,int num_vfs)173 int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
174 {
175 	struct mlx5_core_dev *dev  = pci_get_drvdata(pdev);
176 	struct mlx5_core_sriov *sriov = &dev->priv.sriov;
177 	int err = 0;
178 
179 	mlx5_core_dbg(dev, "requested num_vfs %d\n", num_vfs);
180 
181 	if (num_vfs)
182 		err = mlx5_sriov_enable(pdev, num_vfs);
183 	else
184 		mlx5_sriov_disable(pdev);
185 
186 	if (!err)
187 		sriov->num_vfs = num_vfs;
188 	return err ? err : num_vfs;
189 }
190 
mlx5_core_sriov_set_msix_vec_count(struct pci_dev * vf,int msix_vec_count)191 int mlx5_core_sriov_set_msix_vec_count(struct pci_dev *vf, int msix_vec_count)
192 {
193 	struct pci_dev *pf = pci_physfn(vf);
194 	struct mlx5_core_sriov *sriov;
195 	struct mlx5_core_dev *dev;
196 	int num_vf_msix, id;
197 
198 	dev = pci_get_drvdata(pf);
199 	num_vf_msix = MLX5_CAP_GEN_MAX(dev, num_total_dynamic_vf_msix);
200 	if (!num_vf_msix)
201 		return -EOPNOTSUPP;
202 
203 	if (!msix_vec_count)
204 		msix_vec_count =
205 			mlx5_get_default_msix_vec_count(dev, pci_num_vf(pf));
206 
207 	sriov = &dev->priv.sriov;
208 
209 	/* Reversed translation of PCI VF function number to the internal
210 	 * function_id, which exists in the name of virtfn symlink.
211 	 */
212 	for (id = 0; id < pci_num_vf(pf); id++) {
213 		if (!sriov->vfs_ctx[id].enabled)
214 			continue;
215 
216 		if (vf->devfn == pci_iov_virtfn_devfn(pf, id))
217 			break;
218 	}
219 
220 	if (id == pci_num_vf(pf) || !sriov->vfs_ctx[id].enabled)
221 		return -EINVAL;
222 
223 	return mlx5_set_msix_vec_count(dev, id + 1, msix_vec_count);
224 }
225 
mlx5_sriov_attach(struct mlx5_core_dev * dev)226 int mlx5_sriov_attach(struct mlx5_core_dev *dev)
227 {
228 	if (!mlx5_core_is_pf(dev) || !pci_num_vf(dev->pdev))
229 		return 0;
230 
231 	/* If sriov VFs exist in PCI level, enable them in device level */
232 	return mlx5_device_enable_sriov(dev, pci_num_vf(dev->pdev));
233 }
234 
mlx5_sriov_detach(struct mlx5_core_dev * dev)235 void mlx5_sriov_detach(struct mlx5_core_dev *dev)
236 {
237 	if (!mlx5_core_is_pf(dev))
238 		return;
239 
240 	mlx5_device_disable_sriov(dev, pci_num_vf(dev->pdev), false);
241 }
242 
mlx5_get_max_vfs(struct mlx5_core_dev * dev)243 static u16 mlx5_get_max_vfs(struct mlx5_core_dev *dev)
244 {
245 	u16 host_total_vfs;
246 	const u32 *out;
247 
248 	if (mlx5_core_is_ecpf_esw_manager(dev)) {
249 		out = mlx5_esw_query_functions(dev);
250 
251 		/* Old FW doesn't support getting total_vfs from esw func
252 		 * but supports getting it from pci_sriov.
253 		 */
254 		if (IS_ERR(out))
255 			goto done;
256 		host_total_vfs = MLX5_GET(query_esw_functions_out, out,
257 					  host_params_context.host_total_vfs);
258 		kvfree(out);
259 		return host_total_vfs;
260 	}
261 
262 done:
263 	return pci_sriov_get_totalvfs(dev->pdev);
264 }
265 
mlx5_sriov_init(struct mlx5_core_dev * dev)266 int mlx5_sriov_init(struct mlx5_core_dev *dev)
267 {
268 	struct mlx5_core_sriov *sriov = &dev->priv.sriov;
269 	struct pci_dev *pdev = dev->pdev;
270 	int total_vfs;
271 
272 	if (!mlx5_core_is_pf(dev))
273 		return 0;
274 
275 	total_vfs = pci_sriov_get_totalvfs(pdev);
276 	sriov->max_vfs = mlx5_get_max_vfs(dev);
277 	sriov->num_vfs = pci_num_vf(pdev);
278 	sriov->vfs_ctx = kcalloc(total_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
279 	if (!sriov->vfs_ctx)
280 		return -ENOMEM;
281 
282 	return 0;
283 }
284 
mlx5_sriov_cleanup(struct mlx5_core_dev * dev)285 void mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
286 {
287 	struct mlx5_core_sriov *sriov = &dev->priv.sriov;
288 
289 	if (!mlx5_core_is_pf(dev))
290 		return;
291 
292 	kfree(sriov->vfs_ctx);
293 }
294