[dpdk-dev] [PATCH 23/49] net/ice/base: add support for reading REPC statistics

[Leyi Rong]

Add a new ice_stat_update_repc function which will read the register and
increment the appropriate statistics in the ice_eth_stats structure.

Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr at intel.com>
Signed-off-by: Leyi Rong <leyi.rong at intel.com>
---
 drivers/net/ice/base/ice_common.c | 51 +++++++++++++++++++++++++++++++
 drivers/net/ice/base/ice_common.h |  3 ++
 drivers/net/ice/base/ice_type.h   |  2 ++
 3 files changed, 56 insertions(+)

diff --git a/drivers/net/ice/base/ice_common.c b/drivers/net/ice/base/ice_common.c
index da72434d3..b4a9172b9 100644
--- a/drivers/net/ice/base/ice_common.c
+++ b/drivers/net/ice/base/ice_common.c
@@ -4138,6 +4138,57 @@ ice_stat_update32(struct ice_hw *hw, u32 reg, bool prev_stat_loaded,
 		*cur_stat = (new_data + BIT_ULL(32)) - *prev_stat;
 }
 
+/**
+ * ice_stat_update_repc - read GLV_REPC stats from chip and update stat values
+ * @hw: ptr to the hardware info
+ * @vsi_handle: VSI handle
+ * @prev_stat_loaded: bool to specify if the previous stat values are loaded
+ * @cur_stats: ptr to current stats structure
+ *
+ * The GLV_REPC statistic register actually tracks two 16bit statistics, and
+ * thus cannot be read using the normal ice_stat_update32 function.
+ *
+ * Read the GLV_REPC register associated with the given VSI, and update the
+ * rx_no_desc and rx_error values in the ice_eth_stats structure.
+ *
+ * Because the statistics in GLV_REPC stick at 0xFFFF, the register must be
+ * cleared each time it's read.
+ *
+ * Note that the GLV_RDPC register also counts the causes that would trigger
+ * GLV_REPC. However, it does not give the finer grained detail about why the
+ * packets are being dropped. The GLV_REPC values can be used to distinguish
+ * whether Rx packets are dropped due to errors or due to no available
+ * descriptors.
+ */
+void
+ice_stat_update_repc(struct ice_hw *hw, u16 vsi_handle, bool prev_stat_loaded,
+		     struct ice_eth_stats *cur_stats)
+{
+	u16 vsi_num, no_desc, error_cnt;
+	u32 repc;
+
+	if (!ice_is_vsi_valid(hw, vsi_handle))
+		return;
+
+	vsi_num = ice_get_hw_vsi_num(hw, vsi_handle);
+
+	/* If we haven't loaded stats yet, just clear the current value */
+	if (!prev_stat_loaded) {
+		wr32(hw, GLV_REPC(vsi_num), 0);
+		return;
+	}
+
+	repc = rd32(hw, GLV_REPC(vsi_num));
+	no_desc = (repc & GLV_REPC_NO_DESC_CNT_M) >> GLV_REPC_NO_DESC_CNT_S;
+	error_cnt = (repc & GLV_REPC_ERROR_CNT_M) >> GLV_REPC_ERROR_CNT_S;
+
+	/* Clear the count by writing to the stats register */
+	wr32(hw, GLV_REPC(vsi_num), 0);
+
+	cur_stats->rx_no_desc += no_desc;
+	cur_stats->rx_errors += error_cnt;
+}
+
 
 /**
  * ice_sched_query_elem - query element information from HW
diff --git a/drivers/net/ice/base/ice_common.h b/drivers/net/ice/base/ice_common.h
index 10131b473..2ea4a6e8e 100644
--- a/drivers/net/ice/base/ice_common.h
+++ b/drivers/net/ice/base/ice_common.h
@@ -205,6 +205,9 @@ ice_stat_update40(struct ice_hw *hw, u32 hireg, u32 loreg,
 void
 ice_stat_update32(struct ice_hw *hw, u32 reg, bool prev_stat_loaded,
 		  u64 *prev_stat, u64 *cur_stat);
+void
+ice_stat_update_repc(struct ice_hw *hw, u16 vsi_handle, bool prev_stat_loaded,
+		     struct ice_eth_stats *cur_stats);
 enum ice_status
 ice_sched_query_elem(struct ice_hw *hw, u32 node_teid,
 		     struct ice_aqc_get_elem *buf);
diff --git a/drivers/net/ice/base/ice_type.h b/drivers/net/ice/base/ice_type.h
index 3523b0c35..477f34595 100644
--- a/drivers/net/ice/base/ice_type.h
+++ b/drivers/net/ice/base/ice_type.h
@@ -853,6 +853,8 @@ struct ice_eth_stats {
 	u64 rx_broadcast;		/* bprc */
 	u64 rx_discards;		/* rdpc */
 	u64 rx_unknown_protocol;	/* rupp */
+	u64 rx_no_desc;			/* repc */
+	u64 rx_errors;			/* repc */
 	u64 tx_bytes;			/* gotc */
 	u64 tx_unicast;			/* uptc */
 	u64 tx_multicast;		/* mptc */
-- 
2.17.1