net/smc: add SMC-D diag support

This patch adds diag support for SMC-D.
Signed-off-by: NHans Wippel <hwippel@linux.ibm.com>
Signed-off-by: NUrsula Braun <ubraun@linux.ibm.com>
Suggested-by: NThomas Richter <tmricht@linux.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/uapi/linux/smc_diag.h

@@ -35,6 +35,7 @@ enum {
 	SMC_DIAG_CONNINFO,
 	SMC_DIAG_LGRINFO,
 	SMC_DIAG_SHUTDOWN,
+	SMC_DIAG_DMBINFO,
 	__SMC_DIAG_MAX,
 };
 
@@ -83,4 +84,13 @@ struct smc_diag_lgrinfo {
 	struct smc_diag_linkinfo	lnk[1];
 	__u8				role;
 };
+
+struct smcd_diag_dmbinfo {		/* SMC-D Socket internals */
+	__u32 linkid;			/* Link identifier */
+	__u64 peer_gid;			/* Peer GID */
+	__u64 my_gid;			/* My GID */
+	__u64 token;			/* Token of DMB */
+	__u64 peer_token;		/* Token of remote DMBE */
+};
+
 #endif /* _UAPI_SMC_DIAG_H_ */

net/smc/smc_diag.c

@@ -156,6 +156,21 @@ static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
 		if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 			goto errout;
 	}
+	if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
+	    (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
+	    !list_empty(&smc->conn.lgr->list)) {
+		struct smc_connection *conn = &smc->conn;
+		struct smcd_diag_dmbinfo dinfo = {
+			.linkid = *((u32 *)conn->lgr->id),
+			.peer_gid = conn->lgr->peer_gid,
+			.my_gid = conn->lgr->smcd->local_gid,
+			.token = conn->rmb_desc->token,
+			.peer_token = conn->peer_token
+		};
+
+		if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
+			goto errout;
+	}
 
 	nlmsg_end(skb, nlh);
 	return 0;