This patch allocates the Packet Pacing context from the kernel,
configures one according to requested pace send scheduling
granularuty and assigns to Clock Queue.
Signed-off-by: Viacheslav Ovsiienko <viachesl...@mellanox.com>
Acked-by: Matan Azrad <ma...@mellanox.com>
---
drivers/net/mlx5/mlx5.h | 2 ++
drivers/net/mlx5/mlx5_txpp.c | 71 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+)
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 61a93f9..e8a7b10 100644
--- 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
--- 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"
@@ -49,6 +50,69 @@
}
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)
{
if (wq->sq)
@@ -457,6 +521,7 @@
}
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 @@
* - Clock CQ/SQ
* - Rearm CQ/SQ
* - attaches rearm interrupt handler
+ * - starts Clock Queue
*
* Returns 0 on success, negative otherwise
*/
@@ -520,6 +586,9 @@
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);
if (ret)
goto exit;
@@ -530,6 +599,7 @@
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_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;
--
1.8.3.1
