mlxsw: spectrum_buffers: Allow pools of infinite size

The MC pool should have an infinite size (i.e. no quota).

To that end, add infi_size to the SBPR register and extend
mlxsw_reg_sbpr_pack(). Also add MLXSW_SP_SB_INFI to denote
buffers that should have an infinite size.

Change mlxsw_sp_sb_pr_write() to take as parameter byte size,
instead of cell size, and add the special handling of infinite
buffers. Report pools with infinite size as if they actually
take the full shared buffer size.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 6e8b619b769b..694f6a443769 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -8336,8 +8336,15 @@ MLXSW_ITEM32(reg, sbpr, dir, 0x00, 24, 2);
  */
 MLXSW_ITEM32(reg, sbpr, pool, 0x00, 0, 4);
 
+/* reg_sbpr_infi_size
+ * Size is infinite.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, sbpr, infi_size, 0x04, 31, 1);
+
 /* reg_sbpr_size
  * Pool size in buffer cells.
+ * Reserved when infi_size = 1.
  * Access: RW
  */
 MLXSW_ITEM32(reg, sbpr, size, 0x04, 0, 24);
@@ -8355,13 +8362,15 @@ MLXSW_ITEM32(reg, sbpr, mode, 0x08, 0, 4);
 
 static inline void mlxsw_reg_sbpr_pack(char *payload, u8 pool,
 				       enum mlxsw_reg_sbxx_dir dir,
-				       enum mlxsw_reg_sbpr_mode mode, u32 size)
+				       enum mlxsw_reg_sbpr_mode mode, u32 size,
+				       bool infi_size)
 {
 	MLXSW_REG_ZERO(sbpr, payload);
 	mlxsw_reg_sbpr_pool_set(payload, pool);
 	mlxsw_reg_sbpr_dir_set(payload, dir);
 	mlxsw_reg_sbpr_mode_set(payload, mode);
 	mlxsw_reg_sbpr_size_set(payload, size);
+	mlxsw_reg_sbpr_infi_size_set(payload, infi_size);
 }
 
 /* SBCM - Shared Buffer Class Management Register