[dpdk-dev] [RFC] [PATCH v1 1/3] net/mlx5: add timestamp-to-ns converter from libibverbs

[Patrick Keroulas]

While some devices update their own clock info to provide current time,
mlx5dv part of libibverbs already handles this and also converts any raw
counter cycle to nanoseconds.

Signed-off-by: Patrick Keroulas <patrick.keroulas at radio-canada.ca>
---
 drivers/common/mlx5/mlx5_glue.c | 16 ++++++++++++++++
 drivers/common/mlx5/mlx5_glue.h |  4 ++++
 drivers/net/mlx5/mlx5.c         |  1 +
 drivers/net/mlx5/mlx5.h         |  1 +
 drivers/net/mlx5/mlx5_ethdev.c  | 30 ++++++++++++++++++++++++++++++
 5 files changed, 52 insertions(+)

diff --git a/drivers/common/mlx5/mlx5_glue.c b/drivers/common/mlx5/mlx5_glue.c
index f270f677b..756f24b8b 100644
--- a/drivers/common/mlx5/mlx5_glue.c
+++ b/drivers/common/mlx5/mlx5_glue.c
@@ -80,6 +80,20 @@ mlx5_glue_query_rt_values_ex(struct ibv_context *context,
 	return ibv_query_rt_values_ex(context, values);
 }
 
+static int
+mlx5_glue_get_clock_info(struct ibv_context *context,
+			  struct mlx5dv_clock_info *clock_info)
+{
+	return mlx5dv_get_clock_info(context, clock_info);
+}
+
+static uint64_t
+mlx5_glue_mlx5dv_ts_to_ns(struct mlx5dv_clock_info *clock_info,
+			  uint64_t device_timestamp)
+{
+	return mlx5dv_ts_to_ns(clock_info, device_timestamp);
+}
+
 static int
 mlx5_glue_query_port(struct ibv_context *context, uint8_t port_num,
 		     struct ibv_port_attr *port_attr)
@@ -1195,6 +1209,8 @@ const struct mlx5_glue *mlx5_glue = &(const struct mlx5_glue) {
 	.query_device = mlx5_glue_query_device,
 	.query_device_ex = mlx5_glue_query_device_ex,
 	.query_rt_values_ex = mlx5_glue_query_rt_values_ex,
+	.get_clock_info = mlx5_glue_get_clock_info,
+	.convert_ts_to_ns = mlx5_glue_mlx5dv_ts_to_ns,
 	.query_port = mlx5_glue_query_port,
 	.create_comp_channel = mlx5_glue_create_comp_channel,
 	.destroy_comp_channel = mlx5_glue_destroy_comp_channel,
diff --git a/drivers/common/mlx5/mlx5_glue.h b/drivers/common/mlx5/mlx5_glue.h
index 81d6a2267..d4b3bd793 100644
--- a/drivers/common/mlx5/mlx5_glue.h
+++ b/drivers/common/mlx5/mlx5_glue.h
@@ -123,6 +123,10 @@ struct mlx5_glue {
 			  struct ibv_port_attr *port_attr);
 	struct ibv_comp_channel *(*create_comp_channel)
 		(struct ibv_context *context);
+	int (*get_clock_info)(struct ibv_context *context,
+			       struct mlx5dv_clock_info *clock_info);
+	uint64_t (*convert_ts_to_ns)(struct mlx5dv_clock_info *clock_info,
+			  uint64_t device_timestamp);
 	int (*destroy_comp_channel)(struct ibv_comp_channel *channel);
 	struct ibv_cq *(*create_cq)(struct ibv_context *context, int cqe,
 				    void *cq_context,
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index 5589772eb..7b201844c 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -1569,6 +1569,7 @@ const struct eth_dev_ops mlx5_dev_ops = {
 	.xstats_get_names = mlx5_xstats_get_names,
 	.fw_version_get = mlx5_fw_version_get,
 	.dev_infos_get = mlx5_dev_infos_get,
+	.convert_ts_to_ns = mlx5_convert_ts_to_ns,
 	.read_clock = mlx5_read_clock,
 	.dev_supported_ptypes_get = mlx5_dev_supported_ptypes_get,
 	.vlan_filter_set = mlx5_vlan_filter_set,
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index d9f5d816f..905e24487 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -656,6 +656,7 @@ int mlx5_set_flags(struct rte_eth_dev *dev, unsigned int keep,
 		   unsigned int flags);
 int mlx5_dev_configure(struct rte_eth_dev *dev);
 int mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info);
+int mlx5_convert_ts_to_ns(struct rte_eth_dev *dev, uint64_t *timestamp);
 int mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *clock);
 int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size);
 const uint32_t *mlx5_dev_supported_ptypes_get(struct rte_eth_dev *dev);
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 47f11b963..1d0411f6b 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -690,6 +690,36 @@ mlx5_dev_infos_get(struct rte_eth_dev *dev, struct rte_eth_dev_info *info)
 	return 0;
 }
 
+/**
+ * Convert raw clock counter to nanoseconds
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param[in&out] timestamp
+ *   Pointer to the timestamp to be converted.
+ *
+ * @return
+ *   0 if the clock has correctly been read
+ *   The value of errno in case of error
+ */
+int
+mlx5_convert_ts_to_ns(struct rte_eth_dev *dev, uint64_t *timestamp)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+	struct ibv_context *ctx = priv->sh->ctx;
+	struct mlx5dv_clock_info clock_info;
+
+	int err = mlx5_glue->get_clock_info(ctx, &clock_info);
+	if (err != 0) {
+		DRV_LOG(WARNING, "Could not get the clock info!");
+		return err;
+	}
+
+	*timestamp = mlx5_glue->convert_ts_to_ns(&clock_info, *timestamp);
+
+	return err;
+}
+
 /**
  * Get device current raw clock counter
  *
-- 
2.17.1