net/smc: provide smc mode in smc_diag.c

Rename field diag_fallback into diag_mode and set the smc mode of a
connection explicitly.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/smc_diag.h

@@ -20,7 +20,7 @@ struct smc_diag_req {
 struct smc_diag_msg {
 	__u8	diag_family;
 	__u8	diag_state;
-	__u8	diag_fallback;
+	__u8	diag_mode;
 	__u8	diag_shutdown;
 	struct inet_diag_sockid id;
 
@@ -28,6 +28,13 @@ struct smc_diag_msg {
 	__u64	diag_inode;
 };
 
+/* Mode of a connection */
+enum {
+	SMC_DIAG_MODE_SMCR,
+	SMC_DIAG_MODE_FALLBACK_TCP,
+	SMC_DIAG_MODE_SMCD,
+};
+
 /* Extensions */
 
 enum {

net/smc/smc_diag.c

@@ -91,7 +91,12 @@ static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
 	r = nlmsg_data(nlh);
 	smc_diag_msg_common_fill(r, sk);
 	r->diag_state = sk->sk_state;
-	r->diag_fallback = smc->use_fallback;
+	if (smc->use_fallback)
+		r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
+	else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
+		r->diag_mode = SMC_DIAG_MODE_SMCD;
+	else
+		r->diag_mode = SMC_DIAG_MODE_SMCR;
 	user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
 	if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
 		goto errout;