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Date: Sun, 30 Aug 2009 20:04:42 +0300
From: "Michael S. Tsirkin" <mst@...hat.com>
To: David Miller <davem@...emloft.net>, m.s.tsirkin@...il.com
Cc: mst@...hat.com, netdev@...r.kernel.org, herbert@...dor.apana.org.au
Subject: [PATCH] tun: reuse struct sock fields
As tun always has an embeedded struct sock,
use sk and sk_receive_queue fields instead of
duplicating them in tun_struct.
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
This patch is on top of net-next.
Any comments? Thanks.
drivers/net/tun.c | 30 ++++++++++++------------------
1 files changed, 12 insertions(+), 18 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2533f5c..37e13af 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -103,13 +103,10 @@ struct tun_struct {
uid_t owner;
gid_t group;
- struct sk_buff_head readq;
-
struct net_device *dev;
struct fasync_struct *fasync;
struct tap_filter txflt;
- struct sock *sk;
struct socket socket;
#ifdef TUN_DEBUG
@@ -155,7 +152,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
tfile->tun = tun;
tun->tfile = tfile;
dev_hold(tun->dev);
- sock_hold(tun->sk);
+ sock_hold(tun->socket.sk);
atomic_inc(&tfile->count);
out:
@@ -171,7 +168,7 @@ static void __tun_detach(struct tun_struct *tun)
netif_tx_unlock_bh(tun->dev);
/* Drop read queue */
- skb_queue_purge(&tun->readq);
+ skb_queue_purge(&tun->socket.sk->sk_receive_queue);
/* Drop the extra count on the net device */
dev_put(tun->dev);
@@ -340,7 +337,7 @@ static void tun_free_netdev(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
- sock_put(tun->sk);
+ sock_put(tun->socket.sk);
}
/* Net device open. */
@@ -374,7 +371,7 @@ static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
if (!check_filter(&tun->txflt, skb))
goto drop;
- if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) {
+ if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) {
if (!(tun->flags & TUN_ONE_QUEUE)) {
/* Normal queueing mode. */
/* Packet scheduler handles dropping of further packets. */
@@ -391,7 +388,7 @@ static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
}
/* Enqueue packet */
- skb_queue_tail(&tun->readq, skb);
+ skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb);
dev->trans_start = jiffies;
/* Notify and wake up reader process */
@@ -492,13 +489,13 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
if (!tun)
return POLLERR;
- sk = tun->sk;
+ sk = tun->socket.sk;
DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name);
poll_wait(file, &tun->socket.wait, wait);
- if (!skb_queue_empty(&tun->readq))
+ if (!skb_queue_empty(&sk->sk_receive_queue))
mask |= POLLIN | POLLRDNORM;
if (sock_writeable(sk) ||
@@ -519,7 +516,7 @@ static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
size_t prepad, size_t len,
size_t linear, int noblock)
{
- struct sock *sk = tun->sk;
+ struct sock *sk = tun->socket.sk;
struct sk_buff *skb;
int err;
@@ -787,7 +784,7 @@ static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
current->state = TASK_INTERRUPTIBLE;
/* Read frames from the queue */
- if (!(skb=skb_dequeue(&tun->readq))) {
+ if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) {
if (file->f_flags & O_NONBLOCK) {
ret = -EAGAIN;
break;
@@ -824,8 +821,6 @@ static void tun_setup(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
- skb_queue_head_init(&tun->readq);
-
tun->owner = -1;
tun->group = -1;
@@ -991,7 +986,6 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
sk->sk_write_space = tun_sock_write_space;
sk->sk_sndbuf = INT_MAX;
- tun->sk = sk;
container_of(sk, struct tun_sock, sk)->tun = tun;
tun_net_init(dev);
@@ -1249,7 +1244,7 @@ static long tun_chr_ioctl(struct file *file, unsigned int cmd,
break;
case TUNGETSNDBUF:
- sndbuf = tun->sk->sk_sndbuf;
+ sndbuf = tun->socket.sk->sk_sndbuf;
if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
ret = -EFAULT;
break;
@@ -1260,7 +1255,7 @@ static long tun_chr_ioctl(struct file *file, unsigned int cmd,
break;
}
- tun->sk->sk_sndbuf = sndbuf;
+ tun->socket.sk->sk_sndbuf = sndbuf;
break;
default:
@@ -1343,7 +1338,7 @@ static int tun_chr_close(struct inode *inode, struct file *file)
tun = tfile->tun;
if (tun)
- sock_put(tun->sk);
+ sock_put(tun->socket.sk);
put_net(tfile->net);
kfree(tfile);
--
1.6.2.5
--
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