net/ncsi: NCSI response packet handler

The NCSI response packets are sent to MC (Management Controller)
from the remote end. They are responses of NCSI command packets
for multiple purposes: completion status of NCSI command packets,
return NCSI channel's capability or configuration etc.

This defines struct to represent NCSI response packets and introduces
function ncsi_rcv_rsp() which will be used to receive NCSI response
packets and parse them.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ncsi/Makefile

 #
 # Makefile for NCSI API
 #
-obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-manage.o
+obj-$(CONFIG_NET_NCSI) += ncsi-cmd.o ncsi-rsp.o ncsi-manage.o

net/ncsi/internal.h

@@ -271,5 +271,7 @@ struct ncsi_dev *ncsi_find_dev(struct net_device *dev);
 /* Packet handlers */
 u32 ncsi_calculate_checksum(unsigned char *data, int len);
 int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca);
+int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
+		 struct packet_type *pt, struct net_device *orig_dev);
 
 #endif /* __NCSI_INTERNAL_H__ */