[dpdk-dev] [[PATCH v3 1/4] net/mlx5: query device frequency

[Patrick Keroulas <patrick.keroulas@radio-canada.ca>]

Get clock frequency (constant) from HCA attributes and add an accessor.

Signed-off-by: Patrick Keroulas <patrick.keroulas@radio-canada.ca>
---
 drivers/common/mlx5/mlx5_devx_cmds.c    |  2 ++
 drivers/common/mlx5/mlx5_devx_cmds.h    |  1 +
 drivers/net/mlx5/linux/mlx5_ethdev_os.c | 22 ++++++++++++++++++++++
 drivers/net/mlx5/linux/mlx5_os.c        |  1 +
 drivers/net/mlx5/mlx5.h                 |  1 +
 5 files changed, 27 insertions(+)

diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c
index d1c674c7cf..e6671e3122 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.c
+++ b/drivers/common/mlx5/mlx5_devx_cmds.c
@@ -673,6 +673,8 @@ mlx5_devx_cmd_query_hca_attr(void *ctx,
 			MLX5_GET(cmd_hca_cap, hcattr, flow_counter_bulk_alloc);
 	attr->flow_counters_dump = MLX5_GET(cmd_hca_cap, hcattr,
 					    flow_counters_dump);
+	attr->device_frequency_khz = MLX5_GET(cmd_hca_cap, hcattr,
+					    device_frequency_khz);
 	attr->log_max_rqt_size = MLX5_GET(cmd_hca_cap, hcattr,
 					  log_max_rqt_size);
 	attr->eswitch_manager = MLX5_GET(cmd_hca_cap, hcattr, eswitch_manager);
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h
index 528cb7bdd1..cbe450c4b1 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.h
+++ b/drivers/common/mlx5/mlx5_devx_cmds.h
@@ -87,6 +87,7 @@ struct mlx5_hca_attr {
 	uint32_t lro_timer_supported_periods[MLX5_LRO_NUM_SUPP_PERIODS];
 	uint32_t flex_parser_protocols;
 	uint32_t hairpin:1;
+	uint32_t device_frequency_khz:20;
 	uint32_t log_max_hairpin_queues:5;
 	uint32_t log_max_hairpin_wq_data_sz:5;
 	uint32_t log_max_hairpin_num_packets:5;
diff --git a/drivers/net/mlx5/linux/mlx5_ethdev_os.c b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
index 3d3dd2e862..628a909c8d 100644
--- a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
+++ b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
@@ -301,6 +301,28 @@ mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *clock)
 	return 0;
 }
 
+/**
+ * Get the clock frequency of ethernet device, in Hz
+ *
+ * @param dev
+ *   Pointer to Ethernet device structure.
+ * @param[out] freq
+ *   Pointer to the device clock frequency.
+ *
+ * @return
+ *   0 if the clock has correctly been read
+ *   The value of errno in case of error
+ */
+int
+mlx5_get_clock_freq(struct rte_eth_dev *dev, uint64_t *freq)
+{
+	struct mlx5_priv *priv = dev->data->dev_private;
+
+	*freq = priv->config.hca_attr.device_frequency_khz * 1000;
+
+	return 0;
+}
+
 /**
  * Retrieve the master device for representor in the same switch domain.
  *
diff --git a/drivers/net/mlx5/linux/mlx5_os.c b/drivers/net/mlx5/linux/mlx5_os.c
index fa3b02787e..234e95dbb1 100644
--- a/drivers/net/mlx5/linux/mlx5_os.c
+++ b/drivers/net/mlx5/linux/mlx5_os.c
@@ -2342,6 +2342,7 @@ const struct eth_dev_ops mlx5_os_dev_ops = {
 	.fw_version_get = mlx5_fw_version_get,
 	.dev_infos_get = mlx5_dev_infos_get,
 	.read_clock = mlx5_txpp_read_clock,
+	.get_clock_freq = mlx5_get_clock_freq,
 	.dev_supported_ptypes_get = mlx5_dev_supported_ptypes_get,
 	.vlan_filter_set = mlx5_vlan_filter_set,
 	.rx_queue_setup = mlx5_rx_queue_setup,
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index a92194d2dd..0ccfb6b8d9 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -820,6 +820,7 @@ int mlx5_get_mac(struct rte_eth_dev *dev, uint8_t (*mac)[RTE_ETHER_ADDR_LEN]);
 int mlx5_get_mtu(struct rte_eth_dev *dev, uint16_t *mtu);
 int mlx5_set_mtu(struct rte_eth_dev *dev, uint16_t mtu);
 int mlx5_read_clock(struct rte_eth_dev *dev, uint64_t *clock);
+int mlx5_get_clock_freq(struct rte_eth_dev *dev, uint64_t *freq);
 int mlx5_link_update(struct rte_eth_dev *dev, int wait_to_complete);
 int mlx5_dev_get_flow_ctrl(struct rte_eth_dev *dev,
 			   struct rte_eth_fc_conf *fc_conf);
-- 
2.17.1