mlx5: support RSS hash update and get

[dpdk.git] / drivers / net / mlx5 / mlx5_rss.c

diff --git a/drivers/net/mlx5/mlx5_rss.c b/drivers/net/mlx5/mlx5_rss.c
new file mode 100644 (file)
index 0000000..2dc58e5
--- /dev/null
+++ b/drivers/net/mlx5/mlx5_rss.c
@@ -0,0 +1,168 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright 2015 6WIND S.A.
+ *   Copyright 2015 Mellanox.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of 6WIND S.A. nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+
+/* Verbs header. */
+/* ISO C doesn't support unnamed structs/unions, disabling -pedantic. */
+#ifdef PEDANTIC
+#pragma GCC diagnostic ignored "-pedantic"
+#endif
+#include <infiniband/verbs.h>
+#ifdef PEDANTIC
+#pragma GCC diagnostic error "-pedantic"
+#endif
+
+/* DPDK headers don't like -pedantic. */
+#ifdef PEDANTIC
+#pragma GCC diagnostic ignored "-pedantic"
+#endif
+#include <rte_malloc.h>
+#include <rte_ethdev.h>
+#ifdef PEDANTIC
+#pragma GCC diagnostic error "-pedantic"
+#endif
+
+#include "mlx5.h"
+#include "mlx5_rxtx.h"
+
+/**
+ * Register a RSS key.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param key
+ *   Hash key to register.
+ * @param key_len
+ *   Hash key length in bytes.
+ *
+ * @return
+ *   0 on success, errno value on failure.
+ */
+int
+rss_hash_rss_conf_new_key(struct priv *priv, const uint8_t *key,
+                         unsigned int key_len)
+{
+       struct rte_eth_rss_conf *rss_conf;
+
+       rss_conf = rte_realloc(priv->rss_conf,
+                              (sizeof(*rss_conf) + key_len),
+                              0);
+       if (!rss_conf)
+               return ENOMEM;
+       rss_conf->rss_key = (void *)(rss_conf + 1);
+       rss_conf->rss_key_len = key_len;
+       memcpy(rss_conf->rss_key, key, key_len);
+       priv->rss_conf = rss_conf;
+       return 0;
+}
+
+/**
+ * DPDK callback to update the RSS hash configuration.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param[in] rss_conf
+ *   RSS configuration data.
+ *
+ * @return
+ *   0 on success, negative errno value on failure.
+ */
+int
+mlx5_rss_hash_update(struct rte_eth_dev *dev,
+                    struct rte_eth_rss_conf *rss_conf)
+{
+       struct priv *priv = dev->data->dev_private;
+       int err = 0;
+
+       priv_lock(priv);
+
+       assert(priv->rss_conf != NULL);
+
+       /* Apply configuration. */
+       if (rss_conf->rss_key)
+               err = rss_hash_rss_conf_new_key(priv,
+                                               rss_conf->rss_key,
+                                               rss_conf->rss_key_len);
+       else
+               err = rss_hash_rss_conf_new_key(priv,
+                                               rss_hash_default_key,
+                                               rss_hash_default_key_len);
+
+       /* Store the configuration set into port configure.
+        * This will enable/disable hash RX queues associated to the protocols
+        * enabled/disabled by this update. */
+       priv->dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf =
+               rss_conf->rss_hf;
+       priv_unlock(priv);
+       assert(err >= 0);
+       return -err;
+}
+
+/**
+ * DPDK callback to get the RSS hash configuration.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param[in, out] rss_conf
+ *   RSS configuration data.
+ *
+ * @return
+ *   0 on success, negative errno value on failure.
+ */
+int
+mlx5_rss_hash_conf_get(struct rte_eth_dev *dev,
+                      struct rte_eth_rss_conf *rss_conf)
+{
+       struct priv *priv = dev->data->dev_private;
+
+       priv_lock(priv);
+
+       assert(priv->rss_conf != NULL);
+
+       if (rss_conf->rss_key &&
+           rss_conf->rss_key_len >= priv->rss_conf->rss_key_len)
+               memcpy(rss_conf->rss_key,
+                      priv->rss_conf->rss_key,
+                      priv->rss_conf->rss_key_len);
+       rss_conf->rss_key_len = priv->rss_conf->rss_key_len;
+       /* FIXME: rss_hf should be more specific. */
+       rss_conf->rss_hf = ETH_RSS_PROTO_MASK;
+
+       priv_unlock(priv);
+       return 0;
+}