perf: Add CHAN_SIZE parameter to Fast-channel's attributes

Add "CHAN_SIZE" parameter to WORD riscv-non-isa#4.

Signed-off-by: Ley Foon Tan <[email protected]>

src/srvgrp-performance.adoc

@@ -519,18 +519,22 @@ doorbell is not supported.
 !===
 | 2	|PHYS_ADDR_LOW	 | uint32	| Lower `32 bits` of physical address
 | 3	|PHYS_ADDR_HIGH  | uint32	| Upper `32 bits` of physical address
-| 4	|DB_ADDR_LOW	 | uint32	| Lower `32 bits` of doorbell address. This field is unused if
+| 4	|CHAN_SIZE	 | uint32	| Size of the Fast-channel in bytes. +
+The value of this field must be adequate to hold the payload of the message for
+which this Fast-channel is utilized. For additional information regarding
+payload requirements, please refer <<Performance Fast-Channels>>.
+| 5	|DB_ADDR_LOW	 | uint32	| Lower `32 bits` of doorbell address. This field is unused if
 doorbell is not supported.
-| 5	|DB_ADDR_HIGH	 | uint32	| Upper `32 bits` of doorbell address. This field is unused if
+| 6	|DB_ADDR_HIGH	 | uint32	| Upper `32 bits` of doorbell address. This field is unused if
 doorbell is not supported.
-| 6	|DB_ID_LOW	 | uint32	| Lower `32 bits` of doorbell ID. This field is unused if
+| 7	|DB_ID_LOW	 | uint32	| Lower `32 bits` of doorbell ID. This field is unused if
 doorbell is not supported.
-| 7	|DB_ID_HIGH	 | uint32	| Upper `32 bits` of doorbell ID. This field is unused if
+| 8	|DB_ID_HIGH	 | uint32	| Upper `32 bits` of doorbell ID. This field is unused if
 doorbell is not supported.
-| 8	|DB_PRESERVED_LOW | uint32	| A lower `32 bits` doorbell preserved
+| 9	|DB_PRESERVED_LOW | uint32	| A lower `32 bits` doorbell preserved
 mask to apply for this service before ring the doorbell. This field is unused if
 doorbell is not supported.
-| 9	|DB_PRESERVED_HIGH | uint32	| An upper `32 bits` doorbell preserved
+| 10	|DB_PRESERVED_HIGH | uint32	| An upper `32 bits` doorbell preserved
 mask to apply for this service before ring the doorbell. This field is only 
 valid if the doorbell register width is 64 bits. This field is unused if
 doorbell is not supported.