Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 367 insertions, 0 deletions

diff --git a/drivers/net/mlx5/mlx5_rss.c b/drivers/net/mlx5/mlx5_rss.c
new file mode 100644
index 00000000..639e935b
--- /dev/null
+++ b/drivers/net/mlx5/mlx5_rss.c
@@ -0,0 +1,367 @@
+/*-
+ *   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"
+
+/**
+ * Get a RSS configuration hash key.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param rss_hf
+ *   RSS hash functions configuration must be retrieved for.
+ *
+ * @return
+ *   Pointer to a RSS configuration structure or NULL if rss_hf cannot
+ *   be matched.
+ */
+static struct rte_eth_rss_conf *
+rss_hash_get(struct priv *priv, uint64_t rss_hf)
+{
+	unsigned int i;
+
+	for (i = 0; (i != hash_rxq_init_n); ++i) {
+		uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
+
+		if (!(dpdk_rss_hf & rss_hf))
+			continue;
+		return (*priv->rss_conf)[i];
+	}
+	return NULL;
+}
+
+/**
+ * Register a RSS key.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param key
+ *   Hash key to register.
+ * @param key_len
+ *   Hash key length in bytes.
+ * @param rss_hf
+ *   RSS hash functions the provided key applies to.
+ *
+ * @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, uint64_t rss_hf)
+{
+	unsigned int i;
+
+	for (i = 0; (i != hash_rxq_init_n); ++i) {
+		struct rte_eth_rss_conf *rss_conf;
+		uint64_t dpdk_rss_hf = hash_rxq_init[i].dpdk_rss_hf;
+
+		if (!(dpdk_rss_hf & rss_hf))
+			continue;
+		rss_conf = rte_realloc((*priv->rss_conf)[i],
+				       (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;
+		rss_conf->rss_hf = dpdk_rss_hf;
+		memcpy(rss_conf->rss_key, key, key_len);
+		(*priv->rss_conf)[i] = 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,
+						rss_conf->rss_hf);
+	/* Store protocols for which RSS is enabled. */
+	priv->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;
+	struct rte_eth_rss_conf *priv_rss_conf;
+
+	priv_lock(priv);
+
+	assert(priv->rss_conf != NULL);
+
+	priv_rss_conf = rss_hash_get(priv, rss_conf->rss_hf);
+	if (!priv_rss_conf) {
+		rss_conf->rss_hf = 0;
+		priv_unlock(priv);
+		return -EINVAL;
+	}
+	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;
+	rss_conf->rss_hf = priv_rss_conf->rss_hf;
+
+	priv_unlock(priv);
+	return 0;
+}
+
+/**
+ * Allocate/reallocate RETA index table.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @praram reta_size
+ *   The size of the array to allocate.
+ *
+ * @return
+ *   0 on success, errno value on failure.
+ */
+int
+priv_rss_reta_index_resize(struct priv *priv, unsigned int reta_size)
+{
+	void *mem;
+	unsigned int old_size = priv->reta_idx_n;
+
+	if (priv->reta_idx_n == reta_size)
+		return 0;
+
+	mem = rte_realloc(priv->reta_idx,
+			  reta_size * sizeof((*priv->reta_idx)[0]), 0);
+	if (!mem)
+		return ENOMEM;
+	priv->reta_idx = mem;
+	priv->reta_idx_n = reta_size;
+
+	if (old_size < reta_size)
+		memset(&(*priv->reta_idx)[old_size], 0,
+		       (reta_size - old_size) *
+		       sizeof((*priv->reta_idx)[0]));
+	return 0;
+}
+
+/**
+ * Query RETA table.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param[in, out] reta_conf
+ *   Pointer to the first RETA configuration structure.
+ * @param reta_size
+ *   Number of entries.
+ *
+ * @return
+ *   0 on success, errno value on failure.
+ */
+static int
+priv_dev_rss_reta_query(struct priv *priv,
+			struct rte_eth_rss_reta_entry64 *reta_conf,
+			unsigned int reta_size)
+{
+	unsigned int idx;
+	unsigned int i;
+	int ret;
+
+	/* See RETA comment in mlx5_dev_infos_get(). */
+	ret = priv_rss_reta_index_resize(priv, priv->ind_table_max_size);
+	if (ret)
+		return ret;
+
+	/* Fill each entry of the table even if its bit is not set. */
+	for (idx = 0, i = 0; (i != reta_size); ++i) {
+		idx = i / RTE_RETA_GROUP_SIZE;
+		reta_conf[idx].reta[i % RTE_RETA_GROUP_SIZE] =
+			(*priv->reta_idx)[i];
+	}
+	return 0;
+}
+
+/**
+ * Update RETA table.
+ *
+ * @param priv
+ *   Pointer to private structure.
+ * @param[in] reta_conf
+ *   Pointer to the first RETA configuration structure.
+ * @param reta_size
+ *   Number of entries.
+ *
+ * @return
+ *   0 on success, errno value on failure.
+ */
+static int
+priv_dev_rss_reta_update(struct priv *priv,
+			 struct rte_eth_rss_reta_entry64 *reta_conf,
+			 unsigned int reta_size)
+{
+	unsigned int idx;
+	unsigned int i;
+	unsigned int pos;
+	int ret;
+
+	/* See RETA comment in mlx5_dev_infos_get(). */
+	ret = priv_rss_reta_index_resize(priv, priv->ind_table_max_size);
+	if (ret)
+		return ret;
+
+	for (idx = 0, i = 0; (i != reta_size); ++i) {
+		idx = i / RTE_RETA_GROUP_SIZE;
+		pos = i % RTE_RETA_GROUP_SIZE;
+		if (((reta_conf[idx].mask >> i) & 0x1) == 0)
+			continue;
+		assert(reta_conf[idx].reta[pos] < priv->rxqs_n);
+		(*priv->reta_idx)[i] = reta_conf[idx].reta[pos];
+	}
+	return 0;
+}
+
+/**
+ * DPDK callback to get the RETA indirection table.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param reta_conf
+ *   Pointer to RETA configuration structure array.
+ * @param reta_size
+ *   Size of the RETA table.
+ *
+ * @return
+ *   0 on success, negative errno value on failure.
+ */
+int
+mlx5_dev_rss_reta_query(struct rte_eth_dev *dev,
+			struct rte_eth_rss_reta_entry64 *reta_conf,
+			uint16_t reta_size)
+{
+	int ret;
+	struct priv *priv = dev->data->dev_private;
+
+	priv_lock(priv);
+	ret = priv_dev_rss_reta_query(priv, reta_conf, reta_size);
+	priv_unlock(priv);
+	return -ret;
+}
+
+/**
+ * DPDK callback to update the RETA indirection table.
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param reta_conf
+ *   Pointer to RETA configuration structure array.
+ * @param reta_size
+ *   Size of the RETA table.
+ *
+ * @return
+ *   0 on success, negative errno value on failure.
+ */
+int
+mlx5_dev_rss_reta_update(struct rte_eth_dev *dev,
+			 struct rte_eth_rss_reta_entry64 *reta_conf,
+			 uint16_t reta_size)
+{
+	int ret;
+	struct priv *priv = dev->data->dev_private;
+
+	priv_lock(priv);
+	ret = priv_dev_rss_reta_update(priv, reta_conf, reta_size);
+	priv_unlock(priv);
+	return -ret;
+}