IB/core: Add IP checksum offload support

Add a device capability to show when it can handle checksum offload.
Also add a send flag for inserting checksums and a csum_ok field to
the completion record.

Signed-off-by: Eli Cohen <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

include/rdma/ib_verbs.h

···
 	IB_DEVICE_N_NOTIFY_CQ		= (1<<14),
 	IB_DEVICE_ZERO_STAG		= (1<<15),
 	IB_DEVICE_SEND_W_INV		= (1<<16),
-	IB_DEVICE_MEM_WINDOW		= (1<<17)
+	IB_DEVICE_MEM_WINDOW		= (1<<17),
+	/*
+	 * Devices should set IB_DEVICE_UD_IP_SUM if they support
+	 * insertion of UDP and TCP checksum on outgoing UD IPoIB
+	 * messages and can verify the validity of checksum for
+	 * incoming messages.  Setting this flag implies that the
+	 * IPoIB driver may set NETIF_F_IP_CSUM for datagram mode.
+	 */
+	IB_DEVICE_UD_IP_CSUM		= (1<<18),
 };
 
 enum ib_atomic_cap {
···
 	u8			sl;
 	u8			dlid_path_bits;
 	u8			port_num;	/* valid only for DR SMPs on switches */
+	int			csum_ok;
 };
 
 enum ib_cq_notify_flags {
···
 	IB_SEND_FENCE		= 1,
 	IB_SEND_SIGNALED	= (1<<1),
 	IB_SEND_SOLICITED	= (1<<2),
-	IB_SEND_INLINE		= (1<<3)
+	IB_SEND_INLINE		= (1<<3),
+	IB_SEND_IP_CSUM		= (1<<4)
 };
 
 struct ib_sge {