net/smc: support extended GID in SMC-D lgr netlink attribute

Virtual ISM devices introduced in SMCv2.1 requires a 128 bit extended
GID vs. the existing ISM 64bit GID. So the 2nd 64 bit of extended GID
should be included in SMC-D linkgroup netlink attribute as well.

Signed-off-by: Wen Gu <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/uapi/linux/smc.h

···
 	SMC_NLA_LGR_D_CHID,		/* u16 */
 	SMC_NLA_LGR_D_PAD,		/* flag */
 	SMC_NLA_LGR_D_V2_COMMON,	/* nest */
+	SMC_NLA_LGR_D_EXT_GID,		/* u64 */
+	SMC_NLA_LGR_D_PEER_EXT_GID,	/* u64 */
 	__SMC_NLA_LGR_D_MAX,
 	SMC_NLA_LGR_D_MAX = __SMC_NLA_LGR_D_MAX - 1
 };

include/uapi/linux/smc_diag.h

···
 	__aligned_u64	my_gid;		/* My GID */
 	__aligned_u64	token;		/* Token of DMB */
 	__aligned_u64	peer_token;	/* Token of remote DMBE */
+	__aligned_u64	peer_gid_ext;	/* Peer GID (extended part) */
+	__aligned_u64	my_gid_ext;	/* My GID (extended part) */
 };
 
 #endif /* _UAPI_SMC_DIAG_H_ */

net/smc/smc_core.c

···
 	if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID,
 			      smcd_gid.gid, SMC_NLA_LGR_D_PAD))
 		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_EXT_GID,
+			      smcd_gid.gid_ext, SMC_NLA_LGR_D_PAD))
+		goto errattr;
 	if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid.gid,
 			      SMC_NLA_LGR_D_PAD))
+		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_EXT_GID,
+			      lgr->peer_gid.gid_ext, SMC_NLA_LGR_D_PAD))
 		goto errattr;
 	if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
 		goto errattr;

net/smc/smc_diag.c

···
 
 		dinfo.linkid = *((u32 *)conn->lgr->id);
 		dinfo.peer_gid = conn->lgr->peer_gid.gid;
+		dinfo.peer_gid_ext = conn->lgr->peer_gid.gid_ext;
 		smcd->ops->get_local_gid(smcd, &smcd_gid);
 		dinfo.my_gid = smcd_gid.gid;
+		dinfo.my_gid_ext = smcd_gid.gid_ext;
 		dinfo.token = conn->rmb_desc->token;
 		dinfo.peer_token = conn->peer_token;