From: Eran Ben Elisha <eranbe@mellanox.com>
Date: Fri, 12 May 2017 02:47:02 +0300
Subject: net/mlx5e: Add outbound PCI buffer overflow counter
Patch-mainline: v4.14-rc1
Git-commit: efae7f78c45ba37bdc23a95d219b59ac85bdd0a7
References: bsc#1046305 FATE#322943

Add outbound_pci_buffer_overflow to ethtool output for monitoring the
number of packets that were dropped due to lack of PCIe buffers on
receive path from NIC port toward the host(s).

This counter is valid only in case that tx_overflow_buffer_pkt is
supported in MCAM enhanced features.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c |   12 ++++++++++--
 drivers/net/ethernet/mellanox/mlx5/core/en_stats.h   |   14 ++++++++++++++
 include/linux/mlx5/mlx5_ifc.h                        |    6 ++++--
 3 files changed, 28 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -250,9 +250,13 @@ static void mlx5e_fill_stats_strings(str
 		strcpy(data + (idx++) * ETH_GSTRING_LEN,
 		       pcie_perf_stats_desc[i].format);
 
-	for (i = 0; i < NUM_PCIE_PERF_STALL_COUNTERS(priv); i++)
+	for (i = 0; i < NUM_PCIE_PERF_COUNTERS64(priv); i++)
 		strcpy(data + (idx++) * ETH_GSTRING_LEN,
-		       pcie_perf_stall_stats_desc[i].format);
+		       pcie_perf_stats_desc64[i].format);
+
+	for (i = 0; i < NUM_PCIE_PERF_STALL_COUNTERS(priv); i++)
+	 strcpy(data + (idx++) * ETH_GSTRING_LEN,
+		pcie_perf_stall_stats_desc[i].format);
 
 	for (prio = 0; prio < NUM_PPORT_PRIO; prio++) {
 		for (i = 0; i < NUM_PPORT_PER_PRIO_TRAFFIC_COUNTERS; i++)
@@ -389,6 +393,10 @@ void mlx5e_ethtool_get_ethtool_stats(str
 		data[idx++] = MLX5E_READ_CTR32_BE(&priv->stats.pcie.pcie_perf_counters,
 						  pcie_perf_stats_desc, i);
 
+	for (i = 0; i < NUM_PCIE_PERF_COUNTERS64(priv); i++)
+		data[idx++] = MLX5E_READ_CTR64_BE(&priv->stats.pcie.pcie_perf_counters,
+						  pcie_perf_stats_desc64, i);
+
 	for (i = 0; i < NUM_PCIE_PERF_STALL_COUNTERS(priv); i++)
 		data[idx++] = MLX5E_READ_CTR32_BE(&priv->stats.pcie.pcie_perf_counters,
 						  pcie_perf_stall_stats_desc, i);
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
@@ -307,6 +307,12 @@ static const struct counter_desc pport_e
 	MLX5_GET(mpcnt_reg, (pcie_stats)->pcie_perf_counters, \
 		 counter_set.pcie_perf_cntrs_grp_data_layout.c)
 
+#define PCIE_PERF_OFF64(c) \
+	MLX5_BYTE_OFF(mpcnt_reg, counter_set.pcie_perf_cntrs_grp_data_layout.c##_high)
+#define PCIE_PERF_GET64(pcie_stats, c) \
+	MLX5_GET64(mpcnt_reg, (pcie_stats)->pcie_perf_counters, \
+		   counter_set.pcie_perf_cntrs_grp_data_layout.c##_high)
+
 struct mlx5e_pcie_stats {
 	__be64 pcie_perf_counters[MLX5_ST_SZ_QW(mpcnt_reg)];
 };
@@ -316,6 +322,10 @@ static const struct counter_desc pcie_pe
 	{ "tx_pci_signal_integrity", PCIE_PERF_OFF(tx_errors) },
 };
 
+static const struct counter_desc pcie_perf_stats_desc64[] = {
+	{ "outbound_pci_buffer_overflow", PCIE_PERF_OFF64(tx_overflow_buffer_pkt) },
+};
+
 static const struct counter_desc pcie_perf_stall_stats_desc[] = {
 	{ "outbound_pci_stalled_rd", PCIE_PERF_OFF(outbound_stalled_reads) },
 	{ "outbound_pci_stalled_wr", PCIE_PERF_OFF(outbound_stalled_writes) },
@@ -415,6 +425,9 @@ static const struct counter_desc sq_stat
 #define NUM_PCIE_PERF_COUNTERS(priv) \
 	(ARRAY_SIZE(pcie_perf_stats_desc) * \
 	 MLX5_CAP_MCAM_FEATURE((priv)->mdev, pcie_performance_group))
+#define NUM_PCIE_PERF_COUNTERS64(priv) \
+	(ARRAY_SIZE(pcie_perf_stats_desc64) * \
+	 MLX5_CAP_MCAM_FEATURE((priv)->mdev, tx_overflow_buffer_pkt))
 #define NUM_PCIE_PERF_STALL_COUNTERS(priv) \
 	(ARRAY_SIZE(pcie_perf_stall_stats_desc) * \
 	 MLX5_CAP_MCAM_FEATURE((priv)->mdev, pcie_outbound_stalled))
@@ -433,6 +446,7 @@ static const struct counter_desc sq_stat
 					 NUM_PPORT_PRIO + \
 					 NUM_PPORT_ETH_EXT_COUNTERS(priv))
 #define NUM_PCIE_COUNTERS(priv)		(NUM_PCIE_PERF_COUNTERS(priv) + \
+					 NUM_PCIE_PERF_COUNTERS64(priv) +\
 					 NUM_PCIE_PERF_STALL_COUNTERS(priv))
 #define NUM_RQ_STATS			ARRAY_SIZE(rq_stats_desc)
 #define NUM_SQ_STATS			ARRAY_SIZE(sq_stats_desc)
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -1872,7 +1872,9 @@ struct mlx5_ifc_pcie_perf_cntrs_grp_data
 
 	u8         crc_error_tlp[0x20];
 
-	u8         reserved_at_140[0x40];
+	u8         tx_overflow_buffer_pkt_high[0x20];
+
+	u8         tx_overflow_buffer_pkt_low[0x20];
 
 	u8         outbound_stalled_reads[0x20];
 
@@ -7846,7 +7848,7 @@ struct mlx5_ifc_pcam_reg_bits {
 struct mlx5_ifc_mcam_enhanced_features_bits {
 	u8         reserved_at_0[0x7b];
 	u8         pcie_outbound_stalled[0x1];
-	u8         reserved_at_7c[0x1];
+	u8         tx_overflow_buffer_pkt[0x1];
 	u8         mtpps_enh_out_per_adj[0x1];
 	u8         mtpps_fs[0x1];
 	u8         pcie_performance_group[0x1];