netdev - [patch net-next 3/5] mlxsw: spectrum_buffers: Query shared buffer size from firmware

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Date:   Fri, 24 Mar 2017 08:02:49 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com
Subject: [patch net-next 3/5] mlxsw: spectrum_buffers: Query shared buffer size from firmware

From: Ido Schimmel <idosch@...lanox.com>

Instead of hard coding the size of the shared buffer in the driver,
query it from the firmware, as it may change in future devices.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
index 3ab853d..7e67d0e 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
@@ -536,12 +536,15 @@ static int mlxsw_sp_sb_mms_init(struct mlxsw_sp *mlxsw_sp)
 	return 0;
 }
 
-#define MLXSW_SP_SB_SIZE (16 * 1024 * 1024)
-
 int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp)
 {
+	u64 sb_size;
 	int err;
 
+	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MAX_BUFFER_SIZE))
+		return -EIO;
+	sb_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE);
+
 	err = mlxsw_sp_sb_ports_init(mlxsw_sp);
 	if (err)
 		return err;
@@ -554,8 +557,7 @@ int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp)
 	err = mlxsw_sp_sb_mms_init(mlxsw_sp);
 	if (err)
 		goto err_sb_mms_init;
-	err = devlink_sb_register(priv_to_devlink(mlxsw_sp->core), 0,
-				  MLXSW_SP_SB_SIZE,
+	err = devlink_sb_register(priv_to_devlink(mlxsw_sp->core), 0, sb_size,
 				  MLXSW_SP_SB_POOL_COUNT,
 				  MLXSW_SP_SB_POOL_COUNT,
 				  MLXSW_SP_SB_TC_COUNT,
-- 
2.7.4