a2dd7d17c0c48b6f5f09c9f475a2c7d12b8c5963
[deb_dpdk.git] / drivers / net / mlx5 / mlx5_rss.c
1 /*-
2  *   BSD LICENSE
3  *
4  *   Copyright 2015 6WIND S.A.
5  *   Copyright 2015 Mellanox.
6  *
7  *   Redistribution and use in source and binary forms, with or without
8  *   modification, are permitted provided that the following conditions
9  *   are met:
10  *
11  *     * Redistributions of source code must retain the above copyright
12  *       notice, this list of conditions and the following disclaimer.
13  *     * Redistributions in binary form must reproduce the above copyright
14  *       notice, this list of conditions and the following disclaimer in
15  *       the documentation and/or other materials provided with the
16  *       distribution.
17  *     * Neither the name of 6WIND S.A. nor the names of its
18  *       contributors may be used to endorse or promote products derived
19  *       from this software without specific prior written permission.
20  *
21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33
34 #include <stddef.h>
35 #include <stdint.h>
36 #include <errno.h>
37 #include <string.h>
38 #include <assert.h>
39
40 /* Verbs header. */
41 /* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
42 #ifdef PEDANTIC
43 #pragma GCC diagnostic ignored "-Wpedantic"
44 #endif
45 #include <infiniband/verbs.h>
46 #ifdef PEDANTIC
47 #pragma GCC diagnostic error "-Wpedantic"
48 #endif
49
50 /* DPDK headers don't like -pedantic. */
51 #ifdef PEDANTIC
52 #pragma GCC diagnostic ignored "-Wpedantic"
53 #endif
54 #include <rte_malloc.h>
55 #include <rte_ethdev.h>
56 #ifdef PEDANTIC
57 #pragma GCC diagnostic error "-Wpedantic"
58 #endif
59
60 #include "mlx5.h"
61 #include "mlx5_rxtx.h"
62
63 /**
64  * Get a RSS configuration hash key.
65  *
66  * @param priv
67  *   Pointer to private structure.
68  * @param rss_hf
69  *   RSS hash functions configuration must be retrieved for.
70  *
71  * @return
72  *   Pointer to a RSS configuration structure or NULL if rss_hf cannot
73  *   be matched.
74  */
75 static struct rte_eth_rss_conf *
76 rss_hash_get(struct priv *priv, uint64_t rss_hf)
77 {
78         unsigned int i;
79
80         for (i = 0; (i != hash_rxq_init_n); ++i) {
81                 uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
82
83                 if (!(dpdk_rss_hf & rss_hf))
84                         continue;
85                 return (*priv->rss_conf)[i];
86         }
87         return NULL;
88 }
89
90 /**
91  * Register a RSS key.
92  *
93  * @param priv
94  *   Pointer to private structure.
95  * @param key
96  *   Hash key to register.
97  * @param key_len
98  *   Hash key length in bytes.
99  * @param rss_hf
100  *   RSS hash functions the provided key applies to.
101  *
102  * @return
103  *   0 on success, errno value on failure.
104  */
105 int
106 rss_hash_rss_conf_new_key(struct priv *priv, const uint8_t *key,
107                           unsigned int key_len, uint64_t rss_hf)
108 {
109         unsigned int i;
110
111         for (i = 0; (i != hash_rxq_init_n); ++i) {
112                 struct rte_eth_rss_conf *rss_conf;
113                 uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
114
115                 if (!(dpdk_rss_hf & rss_hf))
116                         continue;
117                 rss_conf = rte_realloc((*priv->rss_conf)[i],
118                                        (sizeof(*rss_conf) + key_len),
119                                        0);
120                 if (!rss_conf)
121                         return ENOMEM;
122                 rss_conf->rss_key = (void *)(rss_conf + 1);
123                 rss_conf->rss_key_len = key_len;
124                 rss_conf->rss_hf = dpdk_rss_hf;
125                 memcpy(rss_conf->rss_key, key, key_len);
126                 (*priv->rss_conf)[i] = rss_conf;
127         }
128         return 0;
129 }
130
131 /**
132  * DPDK callback to update the RSS hash configuration.
133  *
134  * @param dev
135  *   Pointer to Ethernet device structure.
136  * @param[in] rss_conf
137  *   RSS configuration data.
138  *
139  * @return
140  *   0 on success, negative errno value on failure.
141  */
142 int
143 mlx5_rss_hash_update(struct rte_eth_dev *dev,
144                      struct rte_eth_rss_conf *rss_conf)
145 {
146         struct priv *priv = dev->data->dev_private;
147         int err = 0;
148
149         priv_lock(priv);
150
151         assert(priv->rss_conf != NULL);
152
153         /* Apply configuration. */
154         if (rss_conf->rss_key)
155                 err = rss_hash_rss_conf_new_key(priv,
156                                                 rss_conf->rss_key,
157                                                 rss_conf->rss_key_len,
158                                                 rss_conf->rss_hf);
159         /* Store protocols for which RSS is enabled. */
160         priv->rss_hf = rss_conf->rss_hf;
161         priv_unlock(priv);
162         assert(err >= 0);
163         return -err;
164 }
165
166 /**
167  * DPDK callback to get the RSS hash configuration.
168  *
169  * @param dev
170  *   Pointer to Ethernet device structure.
171  * @param[in, out] rss_conf
172  *   RSS configuration data.
173  *
174  * @return
175  *   0 on success, negative errno value on failure.
176  */
177 int
178 mlx5_rss_hash_conf_get(struct rte_eth_dev *dev,
179                        struct rte_eth_rss_conf *rss_conf)
180 {
181         struct priv *priv = dev->data->dev_private;
182         struct rte_eth_rss_conf *priv_rss_conf;
183
184         priv_lock(priv);
185
186         assert(priv->rss_conf != NULL);
187
188         priv_rss_conf = rss_hash_get(priv, rss_conf->rss_hf);
189         if (!priv_rss_conf) {
190                 rss_conf->rss_hf = 0;
191                 priv_unlock(priv);
192                 return -EINVAL;
193         }
194         if (rss_conf->rss_key &&
195             rss_conf->rss_key_len >= priv_rss_conf->rss_key_len)
196                 memcpy(rss_conf->rss_key,
197                        priv_rss_conf->rss_key,
198                        priv_rss_conf->rss_key_len);
199         rss_conf->rss_key_len = priv_rss_conf->rss_key_len;
200         rss_conf->rss_hf = priv_rss_conf->rss_hf;
201
202         priv_unlock(priv);
203         return 0;
204 }
205
206 /**
207  * Allocate/reallocate RETA index table.
208  *
209  * @param priv
210  *   Pointer to private structure.
211  * @praram reta_size
212  *   The size of the array to allocate.
213  *
214  * @return
215  *   0 on success, errno value on failure.
216  */
217 int
218 priv_rss_reta_index_resize(struct priv *priv, unsigned int reta_size)
219 {
220         void *mem;
221         unsigned int old_size = priv->reta_idx_n;
222
223         if (priv->reta_idx_n == reta_size)
224                 return 0;
225
226         mem = rte_realloc(priv->reta_idx,
227                           reta_size * sizeof((*priv->reta_idx)[0]), 0);
228         if (!mem)
229                 return ENOMEM;
230         priv->reta_idx = mem;
231         priv->reta_idx_n = reta_size;
232
233         if (old_size < reta_size)
234                 memset(&(*priv->reta_idx)[old_size], 0,
235                        (reta_size - old_size) *
236                        sizeof((*priv->reta_idx)[0]));
237         return 0;
238 }
239
240 /**
241  * Query RETA table.
242  *
243  * @param priv
244  *   Pointer to private structure.
245  * @param[in, out] reta_conf
246  *   Pointer to the first RETA configuration structure.
247  * @param reta_size
248  *   Number of entries.
249  *
250  * @return
251  *   0 on success, errno value on failure.
252  */
253 static int
254 priv_dev_rss_reta_query(struct priv *priv,
255                         struct rte_eth_rss_reta_entry64 *reta_conf,
256                         unsigned int reta_size)
257 {
258         unsigned int idx;
259         unsigned int i;
260
261         if (!reta_size || reta_size > priv->reta_idx_n)
262                 return EINVAL;
263         /* Fill each entry of the table even if its bit is not set. */
264         for (idx = 0, i = 0; (i != reta_size); ++i) {
265                 idx = i / RTE_RETA_GROUP_SIZE;
266                 reta_conf[idx].reta[i % RTE_RETA_GROUP_SIZE] =
267                         (*priv->reta_idx)[i];
268         }
269         return 0;
270 }
271
272 /**
273  * Update RETA table.
274  *
275  * @param priv
276  *   Pointer to private structure.
277  * @param[in] reta_conf
278  *   Pointer to the first RETA configuration structure.
279  * @param reta_size
280  *   Number of entries.
281  *
282  * @return
283  *   0 on success, errno value on failure.
284  */
285 static int
286 priv_dev_rss_reta_update(struct priv *priv,
287                          struct rte_eth_rss_reta_entry64 *reta_conf,
288                          unsigned int reta_size)
289 {
290         unsigned int idx;
291         unsigned int i;
292         unsigned int pos;
293         int ret;
294
295         if (!reta_size)
296                 return EINVAL;
297         ret = priv_rss_reta_index_resize(priv, reta_size);
298         if (ret)
299                 return ret;
300
301         for (idx = 0, i = 0; (i != reta_size); ++i) {
302                 idx = i / RTE_RETA_GROUP_SIZE;
303                 pos = i % RTE_RETA_GROUP_SIZE;
304                 if (((reta_conf[idx].mask >> i) & 0x1) == 0)
305                         continue;
306                 assert(reta_conf[idx].reta[pos] < priv->rxqs_n);
307                 (*priv->reta_idx)[i] = reta_conf[idx].reta[pos];
308         }
309         return 0;
310 }
311
312 /**
313  * DPDK callback to get the RETA indirection table.
314  *
315  * @param dev
316  *   Pointer to Ethernet device structure.
317  * @param reta_conf
318  *   Pointer to RETA configuration structure array.
319  * @param reta_size
320  *   Size of the RETA table.
321  *
322  * @return
323  *   0 on success, negative errno value on failure.
324  */
325 int
326 mlx5_dev_rss_reta_query(struct rte_eth_dev *dev,
327                         struct rte_eth_rss_reta_entry64 *reta_conf,
328                         uint16_t reta_size)
329 {
330         int ret;
331         struct priv *priv = dev->data->dev_private;
332
333         priv_lock(priv);
334         ret = priv_dev_rss_reta_query(priv, reta_conf, reta_size);
335         priv_unlock(priv);
336         return -ret;
337 }
338
339 /**
340  * DPDK callback to update the RETA indirection table.
341  *
342  * @param dev
343  *   Pointer to Ethernet device structure.
344  * @param reta_conf
345  *   Pointer to RETA configuration structure array.
346  * @param reta_size
347  *   Size of the RETA table.
348  *
349  * @return
350  *   0 on success, negative errno value on failure.
351  */
352 int
353 mlx5_dev_rss_reta_update(struct rte_eth_dev *dev,
354                          struct rte_eth_rss_reta_entry64 *reta_conf,
355                          uint16_t reta_size)
356 {
357         int ret;
358         struct priv *priv = dev->data->dev_private;
359
360         mlx5_dev_stop(dev);
361         priv_lock(priv);
362         ret = priv_dev_rss_reta_update(priv, reta_conf, reta_size);
363         priv_unlock(priv);
364         if (ret)
365                 return -ret;
366         return mlx5_dev_start(dev);
367 }