datapath: Shrink sw_flow_mask by 8 bytes (64-bit) or 4 bytes (32-bit).

We won't normally have a ton of flow masks but using a size_t to store
values no bigger than sizeof(struct sw_flow_key) seems excessive.

This reduces sw_flow_key_range and sw_flow_mask by 4 bytes on 32-bit
systems.  On 64-bit systems it shrinks sw_flow_key_range by 12 bytes but
sw_flow_mask only by 8 bytes due to padding.

Compile tested only.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>

diff --git a/datapath/flow.h b/datapath/flow.h
index fdc309f..6b68cf1 100644 (file)
--- a/datapath/flow.h
+++ b/datapath/flow.h
@@ -125,8 +125,8 @@ struct sw_flow_key {
 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
 
 struct sw_flow_key_range {
-       size_t start;
-       size_t end;
+       unsigned short int start;
+       unsigned short int end;
 };
 
 struct sw_flow_mask {