net/mlx5_core: Add helper function to read IB error counters

Added helper function to read IB standard error counters
via the PPCNT register.

The PPCNT register read command provides the 32-bit error counters
of both IB/RoCE link layer and transport layer.

Signed-off-by: Meny Yossefi <menyy@mellanox.com>
Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/port.c b/drivers/net/ethernet/mellanox/mlx5/core/port.c
index a87e773e93f3..5635ce7ad693 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/port.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/port.c
@@ -324,6 +324,29 @@ int mlx5_query_port_vl_hw_cap(struct mlx5_core_dev *dev,
 }
 EXPORT_SYMBOL_GPL(mlx5_query_port_vl_hw_cap);
 
+int mlx5_core_query_ib_ppcnt(struct mlx5_core_dev *dev,
+                             u8 port_num, void *out, size_t sz)
+{
+        u32 *in;
+        int err;
+
+        in  = mlx5_vzalloc(sz);
+        if (!in) {
+                err = -ENOMEM;
+                return err;
+        }
+
+        MLX5_SET(ppcnt_reg, in, local_port, port_num);
+
+        MLX5_SET(ppcnt_reg, in, grp, MLX5_INFINIBAND_PORT_COUNTERS_GROUP);
+        err = mlx5_core_access_reg(dev, in, sz, out,
+                                   sz, MLX5_REG_PPCNT, 0, 0);
+
+        kvfree(in);
+        return err;
+}
+EXPORT_SYMBOL_GPL(mlx5_core_query_ib_ppcnt);
+
 int mlx5_set_port_pause(struct mlx5_core_dev *dev, u32 rx_pause, u32 tx_pause)
 {
         u32 in[MLX5_ST_SZ_DW(pfcc_reg)];