From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: handle ioctls SIOCINQ, SIOCOUTQ, and SIOCOUTQNSD
Patch-mainline: v4.18-rc1
Git-commit: 9b67e26f936cd40a551da98914ed56dc5606686b
References: FATE#325694, LTC#167874, bsc#1113480

Summary:     net/smc: SMC-R MVP
Description: Add latest upstream patches to push SMC-R to the MVP level

Upstream-Description:

             net/smc: handle ioctls SIOCINQ, SIOCOUTQ, and SIOCOUTQNSD

             SIOCINQ returns the amount of unread data in the RMB.
             SIOCOUTQ returns the amount of unsent or unacked sent data in the send
             buffer.
             SIOCOUTQNSD returns the amount of data prepared for sending, but
             not yet sent.

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

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/af_smc.c |   33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -29,6 +29,7 @@
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <net/smc.h>
+#include <asm/ioctls.h>
 
 #include "smc.h"
 #include "smc_clc.h"
@@ -1386,12 +1387,38 @@ static int smc_ioctl(struct socket *sock
 		     unsigned long arg)
 {
 	struct smc_sock *smc;
+	int answ;
 
 	smc = smc_sk(sock->sk);
-	if (smc->use_fallback)
+	if (smc->use_fallback) {
+		if (!smc->clcsock)
+			return -EBADF;
 		return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
-	else
-		return sock_no_ioctl(sock, cmd, arg);
+	}
+	switch (cmd) {
+	case SIOCINQ: /* same as FIONREAD */
+		if (smc->sk.sk_state == SMC_LISTEN)
+			return -EINVAL;
+		answ = atomic_read(&smc->conn.bytes_to_rcv);
+		break;
+	case SIOCOUTQ:
+		/* output queue size (not send + not acked) */
+		if (smc->sk.sk_state == SMC_LISTEN)
+			return -EINVAL;
+		answ = smc->conn.sndbuf_size -
+					atomic_read(&smc->conn.sndbuf_space);
+		break;
+	case SIOCOUTQNSD:
+		/* output queue size (not send only) */
+		if (smc->sk.sk_state == SMC_LISTEN)
+			return -EINVAL;
+		answ = smc_tx_prepared_sends(&smc->conn);
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return put_user(answ, (int __user *)arg);
 }
 
 static ssize_t smc_sendpage(struct socket *sock, struct page *page,