diff mbox series

[net-next,2/6] gve: Add adminq command to report nic timestamp

Message ID 20250418221254.112433-3-hramamurthy@google.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series gve: Add Rx HW timestamping support | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch
netdev/apply success Patch already applied to net-next-0

Commit Message

Harshitha Ramamurthy April 18, 2025, 10:12 p.m. UTC 
From: John Fraker <jfraker@google.com>

This patch adds an adminq command to read NIC's hardware clock. The
driver allocates dma memory and passes that dma memory address to the
device. The device then writes the clock to the given address.

Co-developed-by: Jeff Rogers <jefrogers@google.com>
Signed-off-by: Jeff Rogers <jefrogers@google.com>
Co-developed-by: Ziwei Xiao <ziweixiao@google.com>
Signed-off-by: Ziwei Xiao <ziweixiao@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: John Fraker <jfraker@google.com>
Signed-off-by: Harshitha Ramamurthy <hramamurthy@google.com>
---
 drivers/net/ethernet/google/gve/gve.h         |  1 +
 drivers/net/ethernet/google/gve/gve_adminq.c  | 20 +++++++++++++++++++
 drivers/net/ethernet/google/gve/gve_adminq.h  | 17 ++++++++++++++++
 drivers/net/ethernet/google/gve/gve_ethtool.c |  3 ++-
 4 files changed, 40 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/google/gve/gve.h
index e9b2c1394b1f..cf6947731a9b 100644
--- a/drivers/net/ethernet/google/gve/gve.h
+++ b/drivers/net/ethernet/google/gve/gve.h
@@ -813,6 +813,7 @@  struct gve_priv {
 	u32 adminq_set_driver_parameter_cnt;
 	u32 adminq_report_stats_cnt;
 	u32 adminq_report_link_speed_cnt;
+	u32 adminq_report_nic_timestamp_cnt;
 	u32 adminq_get_ptype_map_cnt;
 	u32 adminq_verify_driver_compatibility_cnt;
 	u32 adminq_query_flow_rules_cnt;
diff --git a/drivers/net/ethernet/google/gve/gve_adminq.c b/drivers/net/ethernet/google/gve/gve_adminq.c
index ae20d2f7e6e1..f57913a673b4 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.c
+++ b/drivers/net/ethernet/google/gve/gve_adminq.c
@@ -326,6 +326,7 @@  int gve_adminq_alloc(struct device *dev, struct gve_priv *priv)
 	priv->adminq_set_driver_parameter_cnt = 0;
 	priv->adminq_report_stats_cnt = 0;
 	priv->adminq_report_link_speed_cnt = 0;
+	priv->adminq_report_nic_timestamp_cnt = 0;
 	priv->adminq_get_ptype_map_cnt = 0;
 	priv->adminq_query_flow_rules_cnt = 0;
 	priv->adminq_cfg_flow_rule_cnt = 0;
@@ -564,6 +565,9 @@  static int gve_adminq_issue_cmd(struct gve_priv *priv,
 	case GVE_ADMINQ_REPORT_LINK_SPEED:
 		priv->adminq_report_link_speed_cnt++;
 		break;
+	case GVE_ADMINQ_REPORT_NIC_TIMESTAMP:
+		priv->adminq_report_nic_timestamp_cnt++;
+		break;
 	case GVE_ADMINQ_GET_PTYPE_MAP:
 		priv->adminq_get_ptype_map_cnt++;
 		break;
@@ -1229,6 +1233,22 @@  int gve_adminq_report_link_speed(struct gve_priv *priv)
 	return err;
 }
 
+int gve_adminq_report_nic_ts(struct gve_priv *priv,
+			     dma_addr_t nic_ts_report_addr)
+{
+	union gve_adminq_command cmd;
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.opcode = cpu_to_be32(GVE_ADMINQ_REPORT_NIC_TIMESTAMP);
+	cmd.report_nic_ts = (struct gve_adminq_report_nic_ts) {
+		.nic_ts_report_len =
+			cpu_to_be64(sizeof(struct gve_nic_ts_report)),
+		.nic_ts_report_addr = cpu_to_be64(nic_ts_report_addr),
+	};
+
+	return gve_adminq_execute_cmd(priv, &cmd);
+}
+
 int gve_adminq_get_ptype_map_dqo(struct gve_priv *priv,
 				 struct gve_ptype_lut *ptype_lut)
 {
diff --git a/drivers/net/ethernet/google/gve/gve_adminq.h b/drivers/net/ethernet/google/gve/gve_adminq.h
index 42466ee640f1..9360b84536d5 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.h
+++ b/drivers/net/ethernet/google/gve/gve_adminq.h
@@ -27,6 +27,7 @@  enum gve_adminq_opcodes {
 	GVE_ADMINQ_GET_PTYPE_MAP		= 0xE,
 	GVE_ADMINQ_VERIFY_DRIVER_COMPATIBILITY	= 0xF,
 	GVE_ADMINQ_QUERY_FLOW_RULES		= 0x10,
+	GVE_ADMINQ_REPORT_NIC_TIMESTAMP		= 0x11,
 	GVE_ADMINQ_QUERY_RSS			= 0x12,
 
 	/* For commands that are larger than 56 bytes */
@@ -401,6 +402,19 @@  struct gve_adminq_report_link_speed {
 
 static_assert(sizeof(struct gve_adminq_report_link_speed) == 8);
 
+struct gve_adminq_report_nic_ts {
+	__be64 nic_ts_report_len;
+	__be64 nic_ts_report_addr;
+};
+
+static_assert(sizeof(struct gve_adminq_report_nic_ts) == 16);
+
+struct gve_nic_ts_report {
+	__be64 nic_timestamp; /* NIC clock in nanoseconds */
+	__be64 reserved1;
+	__be64 reserved2;
+};
+
 struct stats {
 	__be32 stat_name;
 	__be32 queue_id;
@@ -594,6 +608,7 @@  union gve_adminq_command {
 			struct gve_adminq_query_flow_rules query_flow_rules;
 			struct gve_adminq_configure_rss configure_rss;
 			struct gve_adminq_query_rss query_rss;
+			struct gve_adminq_report_nic_ts report_nic_ts;
 			struct gve_adminq_extended_command extended_command;
 		};
 	};
@@ -633,6 +648,8 @@  int gve_adminq_reset_flow_rules(struct gve_priv *priv);
 int gve_adminq_query_flow_rules(struct gve_priv *priv, u16 query_opcode, u32 starting_loc);
 int gve_adminq_configure_rss(struct gve_priv *priv, struct ethtool_rxfh_param *rxfh);
 int gve_adminq_query_rss_config(struct gve_priv *priv, struct ethtool_rxfh_param *rxfh);
+int gve_adminq_report_nic_ts(struct gve_priv *priv,
+			     dma_addr_t nic_ts_report_addr);
 
 struct gve_ptype_lut;
 int gve_adminq_get_ptype_map_dqo(struct gve_priv *priv,
diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c
index eae1a7595a69..76f759309196 100644
--- a/drivers/net/ethernet/google/gve/gve_ethtool.c
+++ b/drivers/net/ethernet/google/gve/gve_ethtool.c
@@ -76,7 +76,7 @@  static const char gve_gstrings_adminq_stats[][ETH_GSTRING_LEN] = {
 	"adminq_dcfg_device_resources_cnt", "adminq_set_driver_parameter_cnt",
 	"adminq_report_stats_cnt", "adminq_report_link_speed_cnt", "adminq_get_ptype_map_cnt",
 	"adminq_query_flow_rules", "adminq_cfg_flow_rule", "adminq_cfg_rss_cnt",
-	"adminq_query_rss_cnt",
+	"adminq_query_rss_cnt", "adminq_report_nic_timestamp_cnt",
 };
 
 static const char gve_gstrings_priv_flags[][ETH_GSTRING_LEN] = {
@@ -456,6 +456,7 @@  gve_get_ethtool_stats(struct net_device *netdev,
 	data[i++] = priv->adminq_cfg_flow_rule_cnt;
 	data[i++] = priv->adminq_cfg_rss_cnt;
 	data[i++] = priv->adminq_query_rss_cnt;
+	data[i++] = priv->adminq_report_nic_timestamp_cnt;
 }
 
 static void gve_get_channels(struct net_device *netdev,