net/mlx5: allocate packet pacing context

This patch allocates the Packet Pacing context from the kernel,
configures one according to requested pace send scheduling
granularity and assigns to Clock Queue.

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 61a93f9..e8a7b10 100644 (file)
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -568,6 +568,8 @@ struct mlx5_dev_txpp {
        struct mlx5dv_devx_event_channel *echan; /* Event Channel. */
        struct mlx5_txpp_wq clock_queue; /* Clock Queue. */
        struct mlx5_txpp_wq rearm_queue; /* Clock Queue. */
+       struct mlx5dv_pp *pp; /* Packet pacing context. */
+       uint16_t pp_id; /* Packet pacing context index. */
 };
 
 /*

diff --git a/drivers/net/mlx5/mlx5_txpp.c b/drivers/net/mlx5/mlx5_txpp.c
index f600fc5..a0ee872 100644 (file)
--- a/drivers/net/mlx5/mlx5_txpp.c
+++ b/drivers/net/mlx5/mlx5_txpp.c
@@ -6,6 +6,7 @@
 #include <rte_interrupts.h>
 #include <rte_alarm.h>
 #include <rte_malloc.h>
+#include <rte_cycles.h>
 
 #include "mlx5.h"
 #include "mlx5_rxtx.h"
@@ -48,6 +49,69 @@ mlx5_txpp_create_eqn(struct mlx5_dev_ctx_shared *sh)
        return 0;
 }
 
+static void
+mlx5_txpp_free_pp_index(struct mlx5_dev_ctx_shared *sh)
+{
+       if (sh->txpp.pp) {
+               mlx5_glue->dv_free_pp(sh->txpp.pp);
+               sh->txpp.pp = NULL;
+               sh->txpp.pp_id = 0;
+       }
+}
+
+/* Allocate Packet Pacing index from kernel via mlx5dv call. */
+static int
+mlx5_txpp_alloc_pp_index(struct mlx5_dev_ctx_shared *sh)
+{
+#ifdef HAVE_MLX5DV_PP_ALLOC
+       uint32_t pp[MLX5_ST_SZ_DW(set_pp_rate_limit_context)];
+       uint64_t rate;
+
+       MLX5_ASSERT(!sh->txpp.pp);
+       memset(&pp, 0, sizeof(pp));
+       rate = NS_PER_S / sh->txpp.tick;
+       if (rate * sh->txpp.tick != NS_PER_S)
+               DRV_LOG(WARNING, "Packet pacing frequency is not precise.");
+       if (sh->txpp.test) {
+               uint32_t len;
+
+               len = RTE_MAX(MLX5_TXPP_TEST_PKT_SIZE,
+                             (size_t)RTE_ETHER_MIN_LEN);
+               MLX5_SET(set_pp_rate_limit_context, &pp,
+                        burst_upper_bound, len);
+               MLX5_SET(set_pp_rate_limit_context, &pp,
+                        typical_packet_size, len);
+               /* Convert packets per second into kilobits. */
+               rate = (rate * len) / (1000ul / CHAR_BIT);
+               DRV_LOG(INFO, "Packet pacing rate set to %" PRIu64, rate);
+       }
+       MLX5_SET(set_pp_rate_limit_context, &pp, rate_limit, rate);
+       MLX5_SET(set_pp_rate_limit_context, &pp, rate_mode,
+                sh->txpp.test ? MLX5_DATA_RATE : MLX5_WQE_RATE);
+       sh->txpp.pp = mlx5_glue->dv_alloc_pp
+                               (sh->ctx, sizeof(pp), &pp,
+                                MLX5DV_PP_ALLOC_FLAGS_DEDICATED_INDEX);
+       if (sh->txpp.pp == NULL) {
+               DRV_LOG(ERR, "Failed to allocate packet pacing index.");
+               rte_errno = errno;
+               return -errno;
+       }
+       if (!sh->txpp.pp->index) {
+               DRV_LOG(ERR, "Zero packet pacing index allocated.");
+               mlx5_txpp_free_pp_index(sh);
+               rte_errno = ENOTSUP;
+               return -ENOTSUP;
+       }
+       sh->txpp.pp_id = sh->txpp.pp->index;
+       return 0;
+#else
+       RTE_SET_USED(sh);
+       DRV_LOG(ERR, "Allocating pacing index is not supported.");
+       rte_errno = ENOTSUP;
+       return -ENOTSUP;
+#endif
+}
+
 static void
 mlx5_txpp_destroy_send_queue(struct mlx5_txpp_wq *wq)
 {
@@ -457,6 +521,7 @@ mlx5_txpp_create_clock_queue(struct mlx5_dev_ctx_shared *sh)
        }
        sq_attr.state = MLX5_SQC_STATE_RST;
        sq_attr.cqn = wq->cq->id;
+       sq_attr.packet_pacing_rate_limit_index = sh->txpp.pp_id;
        sq_attr.wq_attr.cd_slave = 1;
        sq_attr.wq_attr.uar_page = sh->tx_uar->page_id;
        sq_attr.wq_attr.wq_type = MLX5_WQ_TYPE_CYCLIC;
@@ -503,6 +568,7 @@ error:
  * - Clock CQ/SQ
  * - Rearm CQ/SQ
  * - attaches rearm interrupt handler
+ * - starts Clock Queue
  *
  * Returns 0 on success, negative otherwise
  */
@@ -518,6 +584,9 @@ mlx5_txpp_create(struct mlx5_dev_ctx_shared *sh, struct mlx5_priv *priv)
        sh->txpp.skew = priv->config.tx_skew;
        sh->txpp.freq = priv->config.hca_attr.dev_freq_khz;
        ret = mlx5_txpp_create_eqn(sh);
+       if (ret)
+               goto exit;
+       ret = mlx5_txpp_alloc_pp_index(sh);
        if (ret)
                goto exit;
        ret = mlx5_txpp_create_clock_queue(sh);
@@ -530,6 +599,7 @@ exit:
        if (ret) {
                mlx5_txpp_destroy_rearm_queue(sh);
                mlx5_txpp_destroy_clock_queue(sh);
+               mlx5_txpp_free_pp_index(sh);
                mlx5_txpp_destroy_eqn(sh);
                sh->txpp.tick = 0;
                sh->txpp.test = 0;
@@ -550,6 +620,7 @@ mlx5_txpp_destroy(struct mlx5_dev_ctx_shared *sh)
 {
        mlx5_txpp_destroy_rearm_queue(sh);
        mlx5_txpp_destroy_clock_queue(sh);
+       mlx5_txpp_free_pp_index(sh);
        mlx5_txpp_destroy_eqn(sh);
        sh->txpp.tick = 0;
        sh->txpp.test = 0;