mlx5: support RSS hash update and get
[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,
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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 "-pedantic"
44 #endif
45 #include <infiniband/verbs.h>
46 #ifdef PEDANTIC
47 #pragma GCC diagnostic error "-pedantic"
48 #endif
49
50 /* DPDK headers don't like -pedantic. */
51 #ifdef PEDANTIC
52 #pragma GCC diagnostic ignored "-pedantic"
53 #endif
54 #include <rte_malloc.h>
55 #include <rte_ethdev.h>
56 #ifdef PEDANTIC
57 #pragma GCC diagnostic error "-pedantic"
58 #endif
59
60 #include "mlx5.h"
61 #include "mlx5_rxtx.h"
62
63 /**
64  * Register a RSS key.
65  *
66  * @param priv
67  *   Pointer to private structure.
68  * @param key
69  *   Hash key to register.
70  * @param key_len
71  *   Hash key length in bytes.
72  *
73  * @return
74  *   0 on success, errno value on failure.
75  */
76 int
77 rss_hash_rss_conf_new_key(struct priv *priv, const uint8_t *key,
78                           unsigned int key_len)
79 {
80         struct rte_eth_rss_conf *rss_conf;
81
82         rss_conf = rte_realloc(priv->rss_conf,
83                                (sizeof(*rss_conf) + key_len),
84                                0);
85         if (!rss_conf)
86                 return ENOMEM;
87         rss_conf->rss_key = (void *)(rss_conf + 1);
88         rss_conf->rss_key_len = key_len;
89         memcpy(rss_conf->rss_key, key, key_len);
90         priv->rss_conf = rss_conf;
91         return 0;
92 }
93
94 /**
95  * DPDK callback to update the RSS hash configuration.
96  *
97  * @param dev
98  *   Pointer to Ethernet device structure.
99  * @param[in] rss_conf
100  *   RSS configuration data.
101  *
102  * @return
103  *   0 on success, negative errno value on failure.
104  */
105 int
106 mlx5_rss_hash_update(struct rte_eth_dev *dev,
107                      struct rte_eth_rss_conf *rss_conf)
108 {
109         struct priv *priv = dev->data->dev_private;
110         int err = 0;
111
112         priv_lock(priv);
113
114         assert(priv->rss_conf != NULL);
115
116         /* Apply configuration. */
117         if (rss_conf->rss_key)
118                 err = rss_hash_rss_conf_new_key(priv,
119                                                 rss_conf->rss_key,
120                                                 rss_conf->rss_key_len);
121         else
122                 err = rss_hash_rss_conf_new_key(priv,
123                                                 rss_hash_default_key,
124                                                 rss_hash_default_key_len);
125
126         /* Store the configuration set into port configure.
127          * This will enable/disable hash RX queues associated to the protocols
128          * enabled/disabled by this update. */
129         priv->dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf =
130                 rss_conf->rss_hf;
131         priv_unlock(priv);
132         assert(err >= 0);
133         return -err;
134 }
135
136 /**
137  * DPDK callback to get the RSS hash configuration.
138  *
139  * @param dev
140  *   Pointer to Ethernet device structure.
141  * @param[in, out] rss_conf
142  *   RSS configuration data.
143  *
144  * @return
145  *   0 on success, negative errno value on failure.
146  */
147 int
148 mlx5_rss_hash_conf_get(struct rte_eth_dev *dev,
149                        struct rte_eth_rss_conf *rss_conf)
150 {
151         struct priv *priv = dev->data->dev_private;
152
153         priv_lock(priv);
154
155         assert(priv->rss_conf != NULL);
156
157         if (rss_conf->rss_key &&
158             rss_conf->rss_key_len >= priv->rss_conf->rss_key_len)
159                 memcpy(rss_conf->rss_key,
160                        priv->rss_conf->rss_key,
161                        priv->rss_conf->rss_key_len);
162         rss_conf->rss_key_len = priv->rss_conf->rss_key_len;
163         /* FIXME: rss_hf should be more specific. */
164         rss_conf->rss_hf = ETH_RSS_PROTO_MASK;
165
166         priv_unlock(priv);
167         return 0;
168 }