net: Use more bit fields in napi_gro_cb

[ Upstream commit baa32ff4 ]

This patch moves the free and same_flow fields to be bit fields
(2 and 1 bit sized respectively). This frees up some space for u16's.
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

include/linux/netdevice.h

@@ -1888,20 +1888,15 @@ struct napi_gro_cb {
 	/* Number of segments aggregated. */
 	u16	count;
 
-	/* This is non-zero if the packet may be of the same flow. */
-	u8	same_flow;
-
-	/* Free the skb? */
-	u8	free;
-#define NAPI_GRO_FREE		  1
-#define NAPI_GRO_FREE_STOLEN_HEAD 2
-
 	/* jiffies when first packet was created/queued */
 	unsigned long age;
 
 	/* Used in ipv6_gro_receive() and foo-over-udp */
 	u16	proto;
 
+	/* This is non-zero if the packet may be of the same flow. */
+	u8	same_flow:1;
+
 	/* Used in udp_gro_receive */
 	u8	udp_mark:1;
 
@@ -1911,9 +1906,16 @@ struct napi_gro_cb {
 	/* Number of checksums via CHECKSUM_UNNECESSARY */
 	u8	csum_cnt:3;
 
+	/* Free the skb? */
+	u8	free:2;
+#define NAPI_GRO_FREE		  1
+#define NAPI_GRO_FREE_STOLEN_HEAD 2
+
 	/* Used in foo-over-udp, set in udp[46]_gro_receive */
 	u8	is_ipv6:1;
 
+	/* 7 bit hole */
+
 	/* used to support CHECKSUM_COMPLETE for tunneling protocols */
 	__wsum	csum;