--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright 2017 6WIND S.A.
+ * Copyright 2017 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.
+ */
+
+/**
+ * @file
+ * Rx queues configuration for mlx4 driver.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+/* Verbs headers do not support -pedantic. */
+#ifdef PEDANTIC
+#pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+#include <infiniband/mlx4dv.h>
+#include <infiniband/verbs.h>
+#ifdef PEDANTIC
+#pragma GCC diagnostic error "-Wpedantic"
+#endif
+
+#include <rte_byteorder.h>
+#include <rte_common.h>
+#include <rte_errno.h>
+#include <rte_ethdev.h>
+#include <rte_flow.h>
+#include <rte_malloc.h>
+#include <rte_mbuf.h>
+#include <rte_mempool.h>
+
+#include "mlx4.h"
+#include "mlx4_flow.h"
+#include "mlx4_rxtx.h"
+#include "mlx4_utils.h"
+
+/**
+ * Historical RSS hash key.
+ *
+ * This used to be the default for mlx4 in Linux before v3.19 switched to
+ * generating random hash keys through netdev_rss_key_fill().
+ *
+ * It is used in this PMD for consistency with past DPDK releases but can
+ * now be overridden through user configuration.
+ *
+ * Note: this is not const to work around API quirks.
+ */
+uint8_t
+mlx4_rss_hash_key_default[MLX4_RSS_HASH_KEY_SIZE] = {
+ 0x2c, 0xc6, 0x81, 0xd1,
+ 0x5b, 0xdb, 0xf4, 0xf7,
+ 0xfc, 0xa2, 0x83, 0x19,
+ 0xdb, 0x1a, 0x3e, 0x94,
+ 0x6b, 0x9e, 0x38, 0xd9,
+ 0x2c, 0x9c, 0x03, 0xd1,
+ 0xad, 0x99, 0x44, 0xa7,
+ 0xd9, 0x56, 0x3d, 0x59,
+ 0x06, 0x3c, 0x25, 0xf3,
+ 0xfc, 0x1f, 0xdc, 0x2a,
+};
+
+/**
+ * Obtain a RSS context with specified properties.
+ *
+ * Used when creating a flow rule targeting one or several Rx queues.
+ *
+ * If a matching RSS context already exists, it is returned with its
+ * reference count incremented.
+ *
+ * @param priv
+ * Pointer to private structure.
+ * @param fields
+ * Fields for RSS processing (Verbs format).
+ * @param[in] key
+ * Hash key to use (whose size is exactly MLX4_RSS_HASH_KEY_SIZE).
+ * @param queues
+ * Number of target queues.
+ * @param[in] queue_id
+ * Target queues.
+ *
+ * @return
+ * Pointer to RSS context on success, NULL otherwise and rte_errno is set.
+ */
+struct mlx4_rss *
+mlx4_rss_get(struct priv *priv, uint64_t fields,
+ uint8_t key[MLX4_RSS_HASH_KEY_SIZE],
+ uint16_t queues, const uint16_t queue_id[])
+{
+ struct mlx4_rss *rss;
+ size_t queue_id_size = sizeof(queue_id[0]) * queues;
+
+ LIST_FOREACH(rss, &priv->rss, next)
+ if (fields == rss->fields &&
+ queues == rss->queues &&
+ !memcmp(key, rss->key, MLX4_RSS_HASH_KEY_SIZE) &&
+ !memcmp(queue_id, rss->queue_id, queue_id_size)) {
+ ++rss->refcnt;
+ return rss;
+ }
+ rss = rte_malloc(__func__, offsetof(struct mlx4_rss, queue_id) +
+ queue_id_size, 0);
+ if (!rss)
+ goto error;
+ *rss = (struct mlx4_rss){
+ .priv = priv,
+ .refcnt = 1,
+ .usecnt = 0,
+ .qp = NULL,
+ .ind = NULL,
+ .fields = fields,
+ .queues = queues,
+ };
+ memcpy(rss->key, key, MLX4_RSS_HASH_KEY_SIZE);
+ memcpy(rss->queue_id, queue_id, queue_id_size);
+ LIST_INSERT_HEAD(&priv->rss, rss, next);
+ return rss;
+error:
+ rte_errno = ENOMEM;
+ return NULL;
+}
+
+/**
+ * Release a RSS context instance.
+ *
+ * Used when destroying a flow rule targeting one or several Rx queues.
+ *
+ * This function decrements the reference count of the context and destroys
+ * it after reaching 0. The context must have no users at this point; all
+ * prior calls to mlx4_rss_attach() must have been followed by matching
+ * calls to mlx4_rss_detach().
+ *
+ * @param rss
+ * RSS context to release.
+ */
+void
+mlx4_rss_put(struct mlx4_rss *rss)
+{
+ assert(rss->refcnt);
+ if (--rss->refcnt)
+ return;
+ assert(!rss->usecnt);
+ assert(!rss->qp);
+ assert(!rss->ind);
+ LIST_REMOVE(rss, next);
+ rte_free(rss);
+}
+
+/**
+ * Attach a user to a RSS context instance.
+ *
+ * Used when the RSS QP and indirection table objects must be instantiated,
+ * that is, when a flow rule must be enabled.
+ *
+ * This function increments the usage count of the context.
+ *
+ * @param rss
+ * RSS context to attach to.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_rss_attach(struct mlx4_rss *rss)
+{
+ assert(rss->refcnt);
+ if (rss->usecnt++) {
+ assert(rss->qp);
+ assert(rss->ind);
+ return 0;
+ }
+
+ struct ibv_wq *ind_tbl[rss->queues];
+ struct priv *priv = rss->priv;
+ const char *msg;
+ unsigned int i = 0;
+ int ret;
+
+ if (!rte_is_power_of_2(RTE_DIM(ind_tbl))) {
+ ret = EINVAL;
+ msg = "number of RSS queues must be a power of two";
+ goto error;
+ }
+ for (i = 0; i != RTE_DIM(ind_tbl); ++i) {
+ uint16_t id = rss->queue_id[i];
+ struct rxq *rxq = NULL;
+
+ if (id < priv->dev->data->nb_rx_queues)
+ rxq = priv->dev->data->rx_queues[id];
+ if (!rxq) {
+ ret = EINVAL;
+ msg = "RSS target queue is not configured";
+ goto error;
+ }
+ ret = mlx4_rxq_attach(rxq);
+ if (ret) {
+ ret = -ret;
+ msg = "unable to attach RSS target queue";
+ goto error;
+ }
+ ind_tbl[i] = rxq->wq;
+ }
+ rss->ind = ibv_create_rwq_ind_table
+ (priv->ctx,
+ &(struct ibv_rwq_ind_table_init_attr){
+ .log_ind_tbl_size = rte_log2_u32(RTE_DIM(ind_tbl)),
+ .ind_tbl = ind_tbl,
+ .comp_mask = 0,
+ });
+ if (!rss->ind) {
+ ret = errno ? errno : EINVAL;
+ msg = "RSS indirection table creation failure";
+ goto error;
+ }
+ rss->qp = ibv_create_qp_ex
+ (priv->ctx,
+ &(struct ibv_qp_init_attr_ex){
+ .comp_mask = (IBV_QP_INIT_ATTR_PD |
+ IBV_QP_INIT_ATTR_RX_HASH |
+ IBV_QP_INIT_ATTR_IND_TABLE),
+ .qp_type = IBV_QPT_RAW_PACKET,
+ .pd = priv->pd,
+ .rwq_ind_tbl = rss->ind,
+ .rx_hash_conf = {
+ .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
+ .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
+ .rx_hash_key = rss->key,
+ .rx_hash_fields_mask = rss->fields,
+ },
+ });
+ if (!rss->qp) {
+ ret = errno ? errno : EINVAL;
+ msg = "RSS hash QP creation failure";
+ goto error;
+ }
+ ret = ibv_modify_qp
+ (rss->qp,
+ &(struct ibv_qp_attr){
+ .qp_state = IBV_QPS_INIT,
+ .port_num = priv->port,
+ },
+ IBV_QP_STATE | IBV_QP_PORT);
+ if (ret) {
+ msg = "failed to switch RSS hash QP to INIT state";
+ goto error;
+ }
+ ret = ibv_modify_qp
+ (rss->qp,
+ &(struct ibv_qp_attr){
+ .qp_state = IBV_QPS_RTR,
+ },
+ IBV_QP_STATE);
+ if (ret) {
+ msg = "failed to switch RSS hash QP to RTR state";
+ goto error;
+ }
+ return 0;
+error:
+ if (rss->qp) {
+ claim_zero(ibv_destroy_qp(rss->qp));
+ rss->qp = NULL;
+ }
+ if (rss->ind) {
+ claim_zero(ibv_destroy_rwq_ind_table(rss->ind));
+ rss->ind = NULL;
+ }
+ while (i--)
+ mlx4_rxq_detach(priv->dev->data->rx_queues[rss->queue_id[i]]);
+ ERROR("mlx4: %s", msg);
+ --rss->usecnt;
+ rte_errno = ret;
+ return -ret;
+}
+
+/**
+ * Detach a user from a RSS context instance.
+ *
+ * Used when disabling (not destroying) a flow rule.
+ *
+ * This function decrements the usage count of the context and destroys
+ * usage resources after reaching 0.
+ *
+ * @param rss
+ * RSS context to detach from.
+ */
+void
+mlx4_rss_detach(struct mlx4_rss *rss)
+{
+ struct priv *priv = rss->priv;
+ unsigned int i;
+
+ assert(rss->refcnt);
+ assert(rss->qp);
+ assert(rss->ind);
+ if (--rss->usecnt)
+ return;
+ claim_zero(ibv_destroy_qp(rss->qp));
+ rss->qp = NULL;
+ claim_zero(ibv_destroy_rwq_ind_table(rss->ind));
+ rss->ind = NULL;
+ for (i = 0; i != rss->queues; ++i)
+ mlx4_rxq_detach(priv->dev->data->rx_queues[rss->queue_id[i]]);
+}
+
+/**
+ * Initialize common RSS context resources.
+ *
+ * Because ConnectX-3 hardware limitations require a fixed order in the
+ * indirection table, WQs must be allocated sequentially to be part of a
+ * common RSS context.
+ *
+ * Since a newly created WQ cannot be moved to a different context, this
+ * function allocates them all at once, one for each configured Rx queue,
+ * as well as all related resources (CQs and mbufs).
+ *
+ * This must therefore be done before creating any Rx flow rules relying on
+ * indirection tables.
+ *
+ * @param priv
+ * Pointer to private structure.
+ *
+ * @return
+ * 0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_rss_init(struct priv *priv)
+{
+ struct rte_eth_dev *dev = priv->dev;
+ uint8_t log2_range = rte_log2_u32(dev->data->nb_rx_queues);
+ uint32_t wq_num_prev = 0;
+ const char *msg;
+ unsigned int i;
+ int ret;
+
+ /* Prepare range for RSS contexts before creating the first WQ. */
+ ret = mlx4dv_set_context_attr(priv->ctx,
+ MLX4DV_SET_CTX_ATTR_LOG_WQS_RANGE_SZ,
+ &log2_range);
+ if (ret) {
+ ERROR("cannot set up range size for RSS context to %u"
+ " (for %u Rx queues), error: %s",
+ 1 << log2_range, dev->data->nb_rx_queues, strerror(ret));
+ rte_errno = ret;
+ return -ret;
+ }
+ for (i = 0; i != priv->dev->data->nb_rx_queues; ++i) {
+ struct rxq *rxq = priv->dev->data->rx_queues[i];
+ struct ibv_cq *cq;
+ struct ibv_wq *wq;
+ uint32_t wq_num;
+
+ /* Attach the configured Rx queues. */
+ if (rxq) {
+ assert(!rxq->usecnt);
+ ret = mlx4_rxq_attach(rxq);
+ if (!ret) {
+ wq_num = rxq->wq->wq_num;
+ goto wq_num_check;
+ }
+ ret = -ret;
+ msg = "unable to create Rx queue resources";
+ goto error;
+ }
+ /*
+ * WQs are temporarily allocated for unconfigured Rx queues
+ * to maintain proper index alignment in indirection table
+ * by skipping unused WQ numbers.
+ *
+ * The reason this works at all even though these WQs are
+ * immediately destroyed is that WQNs are allocated
+ * sequentially and are guaranteed to never be reused in the
+ * same context by the underlying implementation.
+ */
+ cq = ibv_create_cq(priv->ctx, 1, NULL, NULL, 0);
+ if (!cq) {
+ ret = ENOMEM;
+ msg = "placeholder CQ creation failure";
+ goto error;
+ }
+ wq = ibv_create_wq
+ (priv->ctx,
+ &(struct ibv_wq_init_attr){
+ .wq_type = IBV_WQT_RQ,
+ .max_wr = 1,
+ .max_sge = 1,
+ .pd = priv->pd,
+ .cq = cq,
+ });
+ if (wq) {
+ wq_num = wq->wq_num;
+ claim_zero(ibv_destroy_wq(wq));
+ } else {
+ wq_num = 0; /* Shut up GCC 4.8 warnings. */
+ }
+ claim_zero(ibv_destroy_cq(cq));
+ if (!wq) {
+ ret = ENOMEM;
+ msg = "placeholder WQ creation failure";
+ goto error;
+ }
+wq_num_check:
+ /*
+ * While guaranteed by the implementation, make sure WQ
+ * numbers are really sequential (as the saying goes,
+ * trust, but verify).
+ */
+ if (i && wq_num - wq_num_prev != 1) {
+ if (rxq)
+ mlx4_rxq_detach(rxq);
+ ret = ERANGE;
+ msg = "WQ numbers are not sequential";
+ goto error;
+ }
+ wq_num_prev = wq_num;
+ }
+ return 0;
+error:
+ ERROR("cannot initialize common RSS resources (queue %u): %s: %s",
+ i, msg, strerror(ret));
+ while (i--) {
+ struct rxq *rxq = priv->dev->data->rx_queues[i];
+
+ if (rxq)
+ mlx4_rxq_detach(rxq);
+ }
+ rte_errno = ret;
+ return -ret;
+}
+
+/**
+ * Release common RSS context resources.
+ *
+ * As the reverse of mlx4_rss_init(), this must be done after removing all
+ * flow rules relying on indirection tables.
+ *
+ * @param priv
+ * Pointer to private structure.
+ */
+void
+mlx4_rss_deinit(struct priv *priv)
+{
+ unsigned int i;
+
+ for (i = 0; i != priv->dev->data->nb_rx_queues; ++i) {
+ struct rxq *rxq = priv->dev->data->rx_queues[i];
+
+ if (rxq) {
+ assert(rxq->usecnt == 1);
+ mlx4_rxq_detach(rxq);
+ }
+ }
+}
+
+/**
+ * Attach a user to a Rx queue.
+ *
+ * Used when the resources of an Rx queue must be instantiated for it to
+ * become in a usable state.
+ *
+ * This function increments the usage count of the Rx queue.
+ *
+ * @param rxq
+ * Pointer to Rx queue structure.
+ *
+ * @return
+ * 0 on success, negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_rxq_attach(struct rxq *rxq)
+{
+ if (rxq->usecnt++) {
+ assert(rxq->cq);
+ assert(rxq->wq);
+ assert(rxq->wqes);
+ assert(rxq->rq_db);
+ return 0;
+ }
+
+ struct priv *priv = rxq->priv;
+ const uint32_t elts_n = 1 << rxq->elts_n;
+ const uint32_t sges_n = 1 << rxq->sges_n;
+ struct rte_mbuf *(*elts)[elts_n] = rxq->elts;
+ struct mlx4dv_obj mlxdv;
+ struct mlx4dv_rwq dv_rwq;
+ struct mlx4dv_cq dv_cq = { .comp_mask = MLX4DV_CQ_MASK_UAR, };
+ const char *msg;
+ struct ibv_cq *cq = NULL;
+ struct ibv_wq *wq = NULL;
+ volatile struct mlx4_wqe_data_seg (*wqes)[];
+ unsigned int i;
+ int ret;
+
+ assert(rte_is_power_of_2(elts_n));
+ cq = ibv_create_cq(priv->ctx, elts_n / sges_n, NULL, rxq->channel, 0);
+ if (!cq) {
+ ret = ENOMEM;
+ msg = "CQ creation failure";
+ goto error;
+ }
+ wq = ibv_create_wq
+ (priv->ctx,
+ &(struct ibv_wq_init_attr){
+ .wq_type = IBV_WQT_RQ,
+ .max_wr = elts_n / sges_n,
+ .max_sge = sges_n,
+ .pd = priv->pd,
+ .cq = cq,
+ });
+ if (!wq) {
+ ret = errno ? errno : EINVAL;
+ msg = "WQ creation failure";
+ goto error;
+ }
+ ret = ibv_modify_wq
+ (wq,
+ &(struct ibv_wq_attr){
+ .attr_mask = IBV_WQ_ATTR_STATE,
+ .wq_state = IBV_WQS_RDY,
+ });
+ if (ret) {
+ msg = "WQ state change to IBV_WQS_RDY failed";
+ goto error;
+ }
+ /* Retrieve device queue information. */
+ mlxdv.cq.in = cq;
+ mlxdv.cq.out = &dv_cq;
+ mlxdv.rwq.in = wq;
+ mlxdv.rwq.out = &dv_rwq;
+ ret = mlx4dv_init_obj(&mlxdv, MLX4DV_OBJ_RWQ | MLX4DV_OBJ_CQ);
+ if (ret) {
+ msg = "failed to obtain device information from WQ/CQ objects";
+ goto error;
+ }
+ wqes = (volatile struct mlx4_wqe_data_seg (*)[])
+ ((uintptr_t)dv_rwq.buf.buf + dv_rwq.rq.offset);
+ for (i = 0; i != RTE_DIM(*elts); ++i) {
+ volatile struct mlx4_wqe_data_seg *scat = &(*wqes)[i];
+ struct rte_mbuf *buf = rte_pktmbuf_alloc(rxq->mp);
+
+ if (buf == NULL) {
+ while (i--) {
+ rte_pktmbuf_free_seg((*elts)[i]);
+ (*elts)[i] = NULL;
+ }
+ ret = ENOMEM;
+ msg = "cannot allocate mbuf";
+ goto error;
+ }
+ /* Headroom is reserved by rte_pktmbuf_alloc(). */
+ assert(buf->data_off == RTE_PKTMBUF_HEADROOM);
+ /* Buffer is supposed to be empty. */
+ assert(rte_pktmbuf_data_len(buf) == 0);
+ assert(rte_pktmbuf_pkt_len(buf) == 0);
+ /* Only the first segment keeps headroom. */
+ if (i % sges_n)
+ buf->data_off = 0;
+ buf->port = rxq->port_id;
+ buf->data_len = rte_pktmbuf_tailroom(buf);
+ buf->pkt_len = rte_pktmbuf_tailroom(buf);
+ buf->nb_segs = 1;
+ *scat = (struct mlx4_wqe_data_seg){
+ .addr = rte_cpu_to_be_64(rte_pktmbuf_mtod(buf,
+ uintptr_t)),
+ .byte_count = rte_cpu_to_be_32(buf->data_len),
+ .lkey = rte_cpu_to_be_32(rxq->mr->lkey),
+ };
+ (*elts)[i] = buf;
+ }
+ DEBUG("%p: allocated and configured %u segments (max %u packets)",
+ (void *)rxq, elts_n, elts_n / sges_n);
+ rxq->cq = cq;
+ rxq->wq = wq;
+ rxq->wqes = wqes;
+ rxq->rq_db = dv_rwq.rdb;
+ rxq->mcq.buf = dv_cq.buf.buf;
+ rxq->mcq.cqe_cnt = dv_cq.cqe_cnt;
+ rxq->mcq.set_ci_db = dv_cq.set_ci_db;
+ rxq->mcq.cqe_64 = (dv_cq.cqe_size & 64) ? 1 : 0;
+ rxq->mcq.arm_db = dv_cq.arm_db;
+ rxq->mcq.arm_sn = dv_cq.arm_sn;
+ rxq->mcq.cqn = dv_cq.cqn;
+ rxq->mcq.cq_uar = dv_cq.cq_uar;
+ rxq->mcq.cq_db_reg = (uint8_t *)dv_cq.cq_uar + MLX4_CQ_DOORBELL;
+ /* Update doorbell counter. */
+ rxq->rq_ci = elts_n / sges_n;
+ rte_wmb();
+ *rxq->rq_db = rte_cpu_to_be_32(rxq->rq_ci);
+ return 0;
+error:
+ if (wq)
+ claim_zero(ibv_destroy_wq(wq));
+ if (cq)
+ claim_zero(ibv_destroy_cq(cq));
+ rte_errno = ret;
+ ERROR("error while attaching Rx queue %p: %s: %s",
+ (void *)rxq, msg, strerror(ret));
+ return -ret;
+}
+
+/**
+ * Detach a user from a Rx queue.
+ *
+ * This function decrements the usage count of the Rx queue and destroys
+ * usage resources after reaching 0.
+ *
+ * @param rxq
+ * Pointer to Rx queue structure.
+ */
+void
+mlx4_rxq_detach(struct rxq *rxq)
+{
+ unsigned int i;
+ struct rte_mbuf *(*elts)[1 << rxq->elts_n] = rxq->elts;
+
+ if (--rxq->usecnt)
+ return;
+ rxq->rq_ci = 0;
+ memset(&rxq->mcq, 0, sizeof(rxq->mcq));
+ rxq->rq_db = NULL;
+ rxq->wqes = NULL;
+ claim_zero(ibv_destroy_wq(rxq->wq));
+ rxq->wq = NULL;
+ claim_zero(ibv_destroy_cq(rxq->cq));
+ rxq->cq = NULL;
+ DEBUG("%p: freeing Rx queue elements", (void *)rxq);
+ for (i = 0; (i != RTE_DIM(*elts)); ++i) {
+ if (!(*elts)[i])
+ continue;
+ rte_pktmbuf_free_seg((*elts)[i]);
+ (*elts)[i] = NULL;
+ }
+}
+
+/**
+ * DPDK callback to configure a Rx queue.
+ *
+ * @param dev
+ * Pointer to Ethernet device structure.
+ * @param idx
+ * Rx queue index.
+ * @param desc
+ * Number of descriptors to configure in queue.
+ * @param socket
+ * NUMA socket on which memory must be allocated.
+ * @param[in] conf
+ * Thresholds parameters.
+ * @param mp
+ * Memory pool for buffer allocations.
+ *
+ * @return
+ * 0 on success, negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx4_rx_queue_setup(struct rte_eth_dev *dev, uint16_t idx, uint16_t desc,
+ unsigned int socket, const struct rte_eth_rxconf *conf,
+ struct rte_mempool *mp)
+{
+ struct priv *priv = dev->data->dev_private;
+ uint32_t mb_len = rte_pktmbuf_data_room_size(mp);
+ struct rte_mbuf *(*elts)[rte_align32pow2(desc)];
+ struct rxq *rxq;
+ struct mlx4_malloc_vec vec[] = {
+ {
+ .align = RTE_CACHE_LINE_SIZE,
+ .size = sizeof(*rxq),
+ .addr = (void **)&rxq,
+ },
+ {
+ .align = RTE_CACHE_LINE_SIZE,
+ .size = sizeof(*elts),
+ .addr = (void **)&elts,
+ },
+ };
+ int ret;
+
+ (void)conf; /* Thresholds configuration (ignored). */
+ DEBUG("%p: configuring queue %u for %u descriptors",
+ (void *)dev, idx, desc);
+ if (idx >= dev->data->nb_rx_queues) {
+ rte_errno = EOVERFLOW;
+ ERROR("%p: queue index out of range (%u >= %u)",
+ (void *)dev, idx, dev->data->nb_rx_queues);
+ return -rte_errno;
+ }
+ rxq = dev->data->rx_queues[idx];
+ if (rxq) {
+ rte_errno = EEXIST;
+ ERROR("%p: Rx queue %u already configured, release it first",
+ (void *)dev, idx);
+ return -rte_errno;
+ }
+ if (!desc) {
+ rte_errno = EINVAL;
+ ERROR("%p: invalid number of Rx descriptors", (void *)dev);
+ return -rte_errno;
+ }
+ if (desc != RTE_DIM(*elts)) {
+ desc = RTE_DIM(*elts);
+ WARN("%p: increased number of descriptors in Rx queue %u"
+ " to the next power of two (%u)",
+ (void *)dev, idx, desc);
+ }
+ /* Allocate and initialize Rx queue. */
+ mlx4_zmallocv_socket("RXQ", vec, RTE_DIM(vec), socket);
+ if (!rxq) {
+ ERROR("%p: unable to allocate queue index %u",
+ (void *)dev, idx);
+ return -rte_errno;
+ }
+ *rxq = (struct rxq){
+ .priv = priv,
+ .mp = mp,
+ .port_id = dev->data->port_id,
+ .sges_n = 0,
+ .elts_n = rte_log2_u32(desc),
+ .elts = elts,
+ /* Toggle Rx checksum offload if hardware supports it. */
+ .csum = (priv->hw_csum &&
+ dev->data->dev_conf.rxmode.hw_ip_checksum),
+ .csum_l2tun = (priv->hw_csum_l2tun &&
+ dev->data->dev_conf.rxmode.hw_ip_checksum),
+ .stats = {
+ .idx = idx,
+ },
+ .socket = socket,
+ };
+ /* Enable scattered packets support for this queue if necessary. */
+ assert(mb_len >= RTE_PKTMBUF_HEADROOM);
+ if (dev->data->dev_conf.rxmode.max_rx_pkt_len <=
+ (mb_len - RTE_PKTMBUF_HEADROOM)) {
+ ;
+ } else if (dev->data->dev_conf.rxmode.enable_scatter) {
+ uint32_t size =
+ RTE_PKTMBUF_HEADROOM +
+ dev->data->dev_conf.rxmode.max_rx_pkt_len;
+ uint32_t sges_n;
+
+ /*
+ * Determine the number of SGEs needed for a full packet
+ * and round it to the next power of two.
+ */
+ sges_n = rte_log2_u32((size / mb_len) + !!(size % mb_len));
+ rxq->sges_n = sges_n;
+ /* Make sure sges_n did not overflow. */
+ size = mb_len * (1 << rxq->sges_n);
+ size -= RTE_PKTMBUF_HEADROOM;
+ if (size < dev->data->dev_conf.rxmode.max_rx_pkt_len) {
+ rte_errno = EOVERFLOW;
+ ERROR("%p: too many SGEs (%u) needed to handle"
+ " requested maximum packet size %u",
+ (void *)dev,
+ 1 << sges_n,
+ dev->data->dev_conf.rxmode.max_rx_pkt_len);
+ goto error;
+ }
+ } else {
+ WARN("%p: the requested maximum Rx packet size (%u) is"
+ " larger than a single mbuf (%u) and scattered"
+ " mode has not been requested",
+ (void *)dev,
+ dev->data->dev_conf.rxmode.max_rx_pkt_len,
+ mb_len - RTE_PKTMBUF_HEADROOM);
+ }
+ DEBUG("%p: maximum number of segments per packet: %u",
+ (void *)dev, 1 << rxq->sges_n);
+ if (desc % (1 << rxq->sges_n)) {
+ rte_errno = EINVAL;
+ ERROR("%p: number of Rx queue descriptors (%u) is not a"
+ " multiple of maximum segments per packet (%u)",
+ (void *)dev,
+ desc,
+ 1 << rxq->sges_n);
+ goto error;
+ }
+ /* Use the entire Rx mempool as the memory region. */
+ rxq->mr = mlx4_mr_get(priv, mp);
+ if (!rxq->mr) {
+ ERROR("%p: MR creation failure: %s",
+ (void *)dev, strerror(rte_errno));
+ goto error;
+ }
+ if (dev->data->dev_conf.intr_conf.rxq) {
+ rxq->channel = ibv_create_comp_channel(priv->ctx);
+ if (rxq->channel == NULL) {
+ rte_errno = ENOMEM;
+ ERROR("%p: Rx interrupt completion channel creation"
+ " failure: %s",
+ (void *)dev, strerror(rte_errno));
+ goto error;
+ }
+ if (mlx4_fd_set_non_blocking(rxq->channel->fd) < 0) {
+ ERROR("%p: unable to make Rx interrupt completion"
+ " channel non-blocking: %s",
+ (void *)dev, strerror(rte_errno));
+ goto error;
+ }
+ }
+ DEBUG("%p: adding Rx queue %p to list", (void *)dev, (void *)rxq);
+ dev->data->rx_queues[idx] = rxq;
+ return 0;
+error:
+ dev->data->rx_queues[idx] = NULL;
+ ret = rte_errno;
+ mlx4_rx_queue_release(rxq);
+ rte_errno = ret;
+ assert(rte_errno > 0);
+ return -rte_errno;
+}
+
+/**
+ * DPDK callback to release a Rx queue.
+ *
+ * @param dpdk_rxq
+ * Generic Rx queue pointer.
+ */
+void
+mlx4_rx_queue_release(void *dpdk_rxq)
+{
+ struct rxq *rxq = (struct rxq *)dpdk_rxq;
+ struct priv *priv;
+ unsigned int i;
+
+ if (rxq == NULL)
+ return;
+ priv = rxq->priv;
+ for (i = 0; i != priv->dev->data->nb_rx_queues; ++i)
+ if (priv->dev->data->rx_queues[i] == rxq) {
+ DEBUG("%p: removing Rx queue %p from list",
+ (void *)priv->dev, (void *)rxq);
+ priv->dev->data->rx_queues[i] = NULL;
+ break;
+ }
+ assert(!rxq->cq);
+ assert(!rxq->wq);
+ assert(!rxq->wqes);
+ assert(!rxq->rq_db);
+ if (rxq->channel)
+ claim_zero(ibv_destroy_comp_channel(rxq->channel));
+ if (rxq->mr)
+ mlx4_mr_put(rxq->mr);
+ rte_free(rxq);
+}
Code Review / deb_dpdk.git / blobdiff