[dpdk-dev] [PATCH 2/2] net/mlx5: add fine grain dynamic flag support

[Ori Kam <orika@mellanox.com>]

The inline feature is designed to save PCI bandwidth by copying some
of the data to the wqe. This feature if enabled works for all packets.

In some cases when using external memory, the PCI bandwidth is not
relevant since the memory can be accessed by other means.

This commit introduce the ability to control the inline with mbuf
granularity.

In order to use this feature the application should register the field
name, and restart the port.

Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
---
 drivers/net/mlx5/mlx5.c                   | 15 +++++++++++++++
 drivers/net/mlx5/mlx5_rxtx.c              |  2 ++
 drivers/net/mlx5/mlx5_rxtx.h              |  3 +++
 drivers/net/mlx5/mlx5_trigger.c           |  8 ++++++++
 drivers/net/mlx5/rte_pmd_mlx5.h           | 32 +++++++++++++++++++++++++++++++
 drivers/net/mlx5/rte_pmd_mlx5_version.map |  7 +++++++
 6 files changed, 67 insertions(+)
 create mode 100644 drivers/net/mlx5/rte_pmd_mlx5.h

diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 50960c9..27dbe27 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -46,6 +46,7 @@
 #include "mlx5_glue.h"
 #include "mlx5_mr.h"
 #include "mlx5_flow.h"
+#include "rte_pmd_mlx5.h"
 
 /* Device parameter to enable RX completion queue compression. */
 #define MLX5_RXQ_CQE_COMP_EN "rxq_cqe_comp_en"
@@ -1988,6 +1989,20 @@ struct mlx5_flow_id_pool *
 	return ret;
 }
 
+int
+rte_pmd_mlx5_get_dyn_flag_names(char *names[], uint16_t n)
+{
+	static const char *const dynf_names[] = {
+		RTE_PMD_MLX5_FINE_GRANULARITY_INLINE,
+	};
+	int num = RTE_MIN(n, RTE_DIM(dynf_names));
+	int i;
+
+	for (i = 0; i < num; i++)
+		strcpy(names[i], dynf_names[i]);
+	return num;
+}
+
 /**
  * Check sibling device configurations.
  *
diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 67cafd1..aa6aa22 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -126,6 +126,8 @@ enum mlx5_txcmp_code {
 uint8_t mlx5_cksum_table[1 << 10] __rte_cache_aligned;
 uint8_t mlx5_swp_types_table[1 << 10] __rte_cache_aligned;
 
+uint64_t rte_net_mlx5_dynf_inline_mask;
+
 /**
  * Build a table to translate Rx completion flags to packet type.
  *
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index e362b4a..7c38c57 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -42,6 +42,9 @@
 /* Support tunnel matching. */
 #define MLX5_FLOW_TUNNEL 9
 
+/* Mbuf dynamic flag offset for inline. */
+extern uint64_t rte_net_mlx5_dynf_inline_mask;
+
 struct mlx5_rxq_stats {
 #ifdef MLX5_PMD_SOFT_COUNTERS
 	uint64_t ipackets; /**< Total of successfully received packets. */
diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index ab6937a..ab253b2 100644
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -13,6 +13,7 @@
 #include "mlx5.h"
 #include "mlx5_rxtx.h"
 #include "mlx5_utils.h"
+#include "rte_pmd_mlx5.h"
 
 /**
  * Stop traffic on Tx queues.
@@ -270,8 +271,15 @@
 {
 	struct mlx5_priv *priv = dev->data->dev_private;
 	int ret;
+	int fine_inline;
 
 	DRV_LOG(DEBUG, "port %u starting device", dev->data->port_id);
+	fine_inline = rte_mbuf_dynflag_lookup
+		(RTE_PMD_MLX5_FINE_GRANULARITY_INLINE, NULL);
+	if (fine_inline > 0)
+		rte_net_mlx5_dynf_inline_mask = 1UL << fine_inline;
+	else
+		rte_net_mlx5_dynf_inline_mask = 0;
 	ret = mlx5_dev_configure_rss_reta(dev);
 	if (ret) {
 		DRV_LOG(ERR, "port %u reta config failed: %s",
diff --git a/drivers/net/mlx5/rte_pmd_mlx5.h b/drivers/net/mlx5/rte_pmd_mlx5.h
new file mode 100644
index 0000000..12e18ca
--- /dev/null
+++ b/drivers/net/mlx5/rte_pmd_mlx5.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2020 Mellanox Technologies, Ltd
+ */
+
+#ifndef RTE_PMD_PRIVATE_MLX5_H_
+#define RTE_PMD_PRIVATE_MLX5_H_
+
+/**
+ * @file
+ * MLX5 public header.
+ *
+ * This interface provides the ability to support private PMD
+ * dynamic flags.
+ */
+
+#define RTE_PMD_MLX5_FINE_GRANULARITY_INLINE "mlx5_fine_granularity_inline"
+
+/**
+ * Returns the dynamic flags name, that are supported.
+ *
+ * @param[out] names
+ *   Array that is used to return the supported dynamic flags names.
+ * @param[in] n
+ *   The number of elements in the names array.
+ *
+ * @return
+ *   The number of dynamic flags that were copied.
+ */
+__rte_experimental
+int rte_pmd_mlx5_get_dyn_flag_names(char *names[], uint16_t n);
+
+#endif
diff --git a/drivers/net/mlx5/rte_pmd_mlx5_version.map b/drivers/net/mlx5/rte_pmd_mlx5_version.map
index f9f17e4..c8b1031 100644
--- a/drivers/net/mlx5/rte_pmd_mlx5_version.map
+++ b/drivers/net/mlx5/rte_pmd_mlx5_version.map
@@ -1,3 +1,10 @@
 DPDK_20.0 {
 	local: *;
 };
+
+EXPERIMENTAL {
+        global:
+
+        # added in 20.02
+	rte_pmd_mlx5_get_dyn_flag_names;
+};
-- 
1.8.3.1