hv_netvsc: Rearrange the hv_negtvsc_packet to be space efficient

BugLink: http://bugs.launchpad.net/bugs/1583357

Rearrange the elements of struct hv_negtvsc_packet for optimal layout -
eliminate unnecessary padding.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 934d2022)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/net/hyperv/hyperv_net.h

@@ -128,32 +128,34 @@ struct ndis_tcp_ip_checksum_info;
 struct hv_netvsc_packet {
 	/* Bookkeeping stuff */
 	u8 status;
-
 	u8 is_data_pkt;
 	u8 xmit_more; /* from skb */
 	u8 cp_partial; /* partial copy into send buffer */
 
-	u16 vlan_tci;
+	u8 rmsg_size; /* RNDIS header and PPI size */
+	u8 rmsg_pgcnt; /* page count of RNDIS header and PPI */
+	u8 page_buf_cnt;
+	u8 pad0;
 
+	u16 vlan_tci;
 	u16 q_idx;
+	u32 send_buf_index;
+
+	u32 total_data_buflen;
+	u32 pad1;
+
 	struct vmbus_channel *channel;
 
 	u64 send_completion_tid;
 	void *send_completion_ctx;
 	void (*send_completion)(void *context);
 
-	u32 send_buf_index;
 
 	/* This points to the memory after page_buf */
 	struct rndis_message *rndis_msg;
 
-	u8 rmsg_size; /* RNDIS header and PPI size */
-	u8 rmsg_pgcnt; /* page count of RNDIS header and PPI */
-
-	u32 total_data_buflen;
 	/* Points to the send/receive buffer where the ethernet frame is */
 	void *data;
-	u8 page_buf_cnt;
 	struct hv_page_buffer *page_buf;
 };