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

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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>
This commit is contained in:
Ursula Braun 2018-05-02 16:56:46 +02:00 committed by David S. Miller
parent ed75986f4a
commit 9b67e26f93
1 changed files with 30 additions and 3 deletions
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33
net/smc/af_smc.c
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@ -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"
@ -1389,12 +1390,38 @@ static int smc_ioctl(struct socket *sock, unsigned int cmd,
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,