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Date: Mon, 10 Jun 2013 14:52:25 +0200
From: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
To: linux-kernel@...r.kernel.org
Cc: netdev@...r.kernel.org, davem@...emloft.net,
Alessandro Rubini <rubini@...dd.com>,
Federico Vaga <federico.vaga@...il.com>
Subject: [PATCH 1/3] net: add support for MOST protocol
This patch adds core support for the MOST protocol. More information
about the protocol can be found at: http://www.mostcooperation.com/
See the lkml message "[PATCH 0/3] MOST network protocol" sent on Jun
10th 2013 about this code and the missing "Signed-off" lines.
---
include/linux/socket.h | 4 +-
include/net/most/most.h | 238 ++++++++++++
net/Kconfig | 1 +
net/Makefile | 1 +
net/core/sock.c | 9 +-
net/most/Kconfig | 15 +
net/most/Makefile | 6 +
net/most/af_most.c | 967 +++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 1237 insertions(+), 4 deletions(-)
create mode 100644 include/net/most/most.h
create mode 100644 net/most/Kconfig
create mode 100644 net/most/Makefile
create mode 100644 net/most/af_most.c
diff --git a/include/linux/socket.h b/include/linux/socket.h
index b10ce4b..b1e6669 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -179,7 +179,8 @@ struct ucred {
#define AF_ALG 38 /* Algorithm sockets */
#define AF_NFC 39 /* NFC sockets */
#define AF_VSOCK 40 /* vSockets */
-#define AF_MAX 41 /* For now.. */
+#define AF_MOST 41 /* MOST sockets */
+#define AF_MAX 42 /* For now.. */
/* Protocol families, same as address families. */
#define PF_UNSPEC AF_UNSPEC
@@ -223,6 +224,7 @@ struct ucred {
#define PF_ALG AF_ALG
#define PF_NFC AF_NFC
#define PF_VSOCK AF_VSOCK
+#define PF_MOST AF_MOST
#define PF_MAX AF_MAX
/* Maximum queue length specifiable by listen. */
diff --git a/include/net/most/most.h b/include/net/most/most.h
new file mode 100644
index 0000000..f266fc7
--- /dev/null
+++ b/include/net/most/most.h
@@ -0,0 +1,238 @@
+#ifndef __MOST_H
+#define __MOST_H
+
+#include <linux/interrupt.h>
+#include <net/sock.h>
+
+/* Reserve for core and drivers use */
+#define MOST_SKB_RESERVE 8
+
+#define CTL_FRAME_SIZE 32
+
+#define MOSTPROTO_DEV 0
+#define MOSTPROTO_CTL 1
+#define MOSTPROTO_SYNC 2
+#define MOSTPROTO_ASYNC 3
+
+#define MOST_NO_CHANNEL 0xFE
+
+#define MOST_CONF_FLAG_UP 0x01
+#define MOST_CONF_FLAG_TX 0x02
+
+enum most_dev_state {
+ MOST_DEV_DOWN = 0,
+ MOST_DEV_UP
+};
+
+enum most_chan_type {
+ CHAN_DEV = 0,
+ CHAN_CTL,
+ CHAN_SYNC,
+ CHAN_ASYNC,
+};
+
+enum {
+ MOST_CONNECTED = 1, /* Equal to TCP_ESTABLISHED makes net code happy */
+ MOST_OPEN,
+ MOST_BOUND,
+};
+
+struct sockaddr_most {
+ sa_family_t most_family;
+ unsigned short most_dev;
+ unsigned char rx_channel;
+ unsigned char tx_channel;
+};
+
+struct sockaddr_mostdev {
+ sa_family_t most_family;
+ unsigned short most_dev;
+};
+
+/* MOST Dev ioctl defines */
+#define MOSTDEVUP _IOW('M', 201, int)
+#define MOSTDEVDOWN _IOW('M', 202, int)
+
+#define MOSTGETDEVLIST _IOR('M', 210, int)
+
+struct most_dev_req {
+ uint16_t dev_id;
+};
+
+struct most_dev_list_req {
+ uint16_t dev_num;
+ struct most_dev_req dev_req[0];
+};
+
+struct most_skb_cb {
+ __u8 channel_type;
+ __u8 channel;
+};
+#define most_cb(skb) ((struct most_skb_cb *)(skb->cb))
+
+struct most_sock {
+ struct sock sk;
+ u8 channel_type;
+ u8 rx_channel;
+ u8 tx_channel;
+ int dev_id;
+ struct most_dev *mdev;
+};
+#define most_sk(sk) ((struct most_sock *)sk)
+
+static inline struct sock *most_sk_alloc(struct net *net,
+ struct proto *pops, u8 channel_type)
+{
+ struct sock *sk = sk_alloc(net, PF_MOST, GFP_ATOMIC, pops);
+ if (sk) {
+ most_sk(sk)->channel_type = channel_type;
+ most_sk(sk)->dev_id = -1;
+ }
+
+ return sk;
+}
+static inline struct sk_buff *most_skb_alloc(unsigned int len, gfp_t how)
+{
+ struct sk_buff *skb = alloc_skb(len + MOST_SKB_RESERVE, how);
+
+ if (skb)
+ skb_reserve(skb, MOST_SKB_RESERVE);
+
+ return skb;
+}
+
+static inline struct sk_buff *most_skb_send_alloc(struct sock *sk,
+ unsigned long len, int nb, int *err)
+{
+ struct sk_buff *skb =
+ sock_alloc_send_skb(sk, len + MOST_SKB_RESERVE, nb, err);
+
+ if (skb)
+ skb_reserve(skb, MOST_SKB_RESERVE);
+
+ return skb;
+}
+
+struct most_sock_list {
+ struct hlist_head head;
+ rwlock_t lock;
+};
+
+
+struct most_dev {
+
+ struct list_head list;
+ atomic_t refcnt;
+
+ char name[8];
+
+ __u16 id;
+ enum most_dev_state state;
+
+ struct module *owner;
+
+ struct tasklet_struct rx_task;
+ struct tasklet_struct tx_task;
+
+ struct sk_buff_head rx_q;
+ struct sk_buff_head ctl_q;
+ struct sk_buff_head async_q;
+ struct sk_buff_head sync_q;
+
+ /* set by the driver */
+
+ void *driver_data;
+ struct device *parent;
+
+ int (*open)(struct most_dev *mdev);
+ int (*close)(struct most_dev *mdev);
+ int (*conf_channel)(struct most_dev *mdev, enum most_chan_type type,
+ u8 channel, u8 flags);
+ int (*send)(struct sk_buff *skb);
+ int (*can_send)(struct sk_buff *skb);
+};
+
+static inline struct most_dev *most_dev_hold(struct most_dev *d)
+{
+ if (try_module_get(d->owner))
+ return d;
+ return NULL;
+}
+
+static inline void most_dev_put(struct most_dev *d)
+{
+ module_put(d->owner);
+}
+
+static inline void most_sched_tx(struct most_dev *mdev)
+{
+ tasklet_schedule(&mdev->tx_task);
+}
+
+static inline void most_sched_rx(struct most_dev *mdev)
+{
+ tasklet_schedule(&mdev->rx_task);
+}
+
+static inline int most_recv_frame(struct sk_buff *skb)
+{
+ struct most_dev *mdev = (struct most_dev *) skb->dev;
+
+ /* Time stamp */
+ __net_timestamp(skb);
+
+ /* Queue frame for rx task */
+ skb_queue_tail(&mdev->rx_q, skb);
+ most_sched_rx(mdev);
+ return 0;
+}
+
+static inline int __most_configure_channel(struct most_dev *mdev,
+ u8 channel_type, u8 channel, u8 up)
+{
+ if (mdev->state != MOST_DEV_UP)
+ return -ENETDOWN;
+
+ if (mdev->conf_channel)
+ if (channel != MOST_NO_CHANNEL)
+ return mdev->conf_channel(mdev, channel_type, channel,
+ up);
+ return 0;
+}
+
+static inline int most_configure_channels(struct most_dev *mdev,
+ struct most_sock *sk, u8 up)
+{
+ int err;
+ u8 flags = (up) ? MOST_CONF_FLAG_UP : 0;
+
+ err = __most_configure_channel(mdev, sk->channel_type, sk->rx_channel,
+ flags);
+ if (err)
+ return err;
+
+ err = __most_configure_channel(mdev, sk->channel_type, sk->tx_channel,
+ flags | MOST_CONF_FLAG_TX);
+ if (err)
+ __most_configure_channel(mdev, sk->channel_type, sk->rx_channel,
+ (up) ? 0 : MOST_CONF_FLAG_UP);
+ return err;
+}
+
+struct most_dev *most_alloc_dev(void);
+void most_free_dev(struct most_dev *mdev);
+int most_register_dev(struct most_dev *mdev);
+int most_unregister_dev(struct most_dev *mdev);
+
+int most_get_dev_list(void __user *arg);
+int most_open_dev(u16 dev_id);
+int most_close_dev(u16 dev_id);
+
+struct most_dev *most_dev_get(int index);
+
+void most_sock_link(struct sock *s);
+void most_sock_unlink(struct sock *sk);
+
+int most_send_to_sock(int dev_id, struct sk_buff *skb);
+
+#endif /* __MOST_H */
diff --git a/net/Kconfig b/net/Kconfig
index 2273655..8bfc9a2 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -327,6 +327,7 @@ source "net/can/Kconfig"
source "net/irda/Kconfig"
source "net/bluetooth/Kconfig"
source "net/rxrpc/Kconfig"
+source "net/most/Kconfig"
config FIB_RULES
bool
diff --git a/net/Makefile b/net/Makefile
index 9492e8c..ee1a125 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_ATM) += atm/
obj-$(CONFIG_L2TP) += l2tp/
obj-$(CONFIG_DECNET) += decnet/
obj-$(CONFIG_PHONET) += phonet/
+obj-$(CONFIG_MOST) += most/
ifneq ($(CONFIG_VLAN_8021Q),)
obj-y += 8021q/
endif
diff --git a/net/core/sock.c b/net/core/sock.c
index 88868a9..920b68f 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -210,7 +210,8 @@ static const char *const af_family_key_strings[AF_MAX+1] = {
"sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
"sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
"sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
- "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX"
+ "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MOST" ,
+ "sk_lock-AF_MAX"
};
static const char *const af_family_slock_key_strings[AF_MAX+1] = {
"slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
@@ -226,7 +227,8 @@ static const char *const af_family_slock_key_strings[AF_MAX+1] = {
"slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
"slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
"slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
- "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX"
+ "slock-AF_NFC" , "slock-AF_VSOCK" , "slock-AF_MOST" ,
+ "slock-AF_MAX"
};
static const char *const af_family_clock_key_strings[AF_MAX+1] = {
"clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
@@ -242,7 +244,8 @@ static const char *const af_family_clock_key_strings[AF_MAX+1] = {
"clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
"clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
"clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
- "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX"
+ "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MOST" ,
+ "clock-AF_MAX"
};
/*
diff --git a/net/most/Kconfig b/net/most/Kconfig
new file mode 100644
index 0000000..6158836
--- /dev/null
+++ b/net/most/Kconfig
@@ -0,0 +1,15 @@
+#
+# Media Oriented Systems Transport (MOST) network layer core configuration
+#
+
+menuconfig MOST
+ depends on NET
+ tristate "MOST bus subsystem support"
+ ---help---
+ Media Oriented Systems Transport (MOST) is a multimedia
+ communications protocol in the automotive industry.
+ You also need a low level for the hardware.
+ Isochronous channels are currently not supported.
+ If you want MOST support you should say Y here.
+
+source "drivers/net/most/Kconfig"
diff --git a/net/most/Makefile b/net/most/Makefile
new file mode 100644
index 0000000..eadb570
--- /dev/null
+++ b/net/most/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the Linux Media Oriented Systems Transport core.
+#
+
+obj-$(CONFIG_MOST) += most.o
+most-objs := af_most.o
diff --git a/net/most/af_most.c b/net/most/af_most.c
new file mode 100644
index 0000000..d51ab1d
--- /dev/null
+++ b/net/most/af_most.c
@@ -0,0 +1,967 @@
+/*
+ * af_most.c Support for the MOST address family
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <net/sock.h>
+#include <net/most/most.h>
+
+#define MOST_MAX_PROTO 4
+static struct net_proto_family most_net_proto_family_ops[];
+static struct proto most_proto[];
+
+/* MOST device list */
+LIST_HEAD(most_dev_list);
+DEFINE_RWLOCK(most_dev_list_lock);
+
+/* * * * * * * * * * * * * * PROTO OPS * * * * * * * * * * * * */
+
+static struct most_sock_list most_sk_list = {
+ .lock = __RW_LOCK_UNLOCKED(ctl_sk_list.lock)
+};
+
+void most_sock_link(struct sock *sk)
+{
+ write_lock_bh(&most_sk_list.lock);
+ sk_add_node(sk, &most_sk_list.head);
+ write_unlock_bh(&most_sk_list.lock);
+}
+EXPORT_SYMBOL(most_sock_link);
+
+void most_sock_unlink(struct sock *sk)
+{
+ write_lock_bh(&most_sk_list.lock);
+ sk_del_node_init(sk);
+ write_unlock_bh(&most_sk_list.lock);
+}
+EXPORT_SYMBOL(most_sock_unlink);
+
+static int channel_in_use(int dev_id, u8 channel)
+{
+ struct sock *sk;
+
+ read_lock_bh(&most_sk_list.lock);
+
+ sk_for_each(sk, &most_sk_list.head)
+ if (most_sk(sk)->dev_id == dev_id &&
+ sk->sk_state == MOST_BOUND &&
+ (most_sk(sk)->rx_channel == channel ||
+ most_sk(sk)->tx_channel == channel))
+ goto found;
+
+ sk = NULL;
+found:
+ read_unlock_bh(&most_sk_list.lock);
+
+ return sk != NULL;
+}
+
+int most_send_to_sock(int dev_id, struct sk_buff *skb)
+{
+ struct sock *sk;
+
+ read_lock(&most_sk_list.lock);
+ sk_for_each(sk, &most_sk_list.head) {
+ if (most_sk(sk)->dev_id == dev_id &&
+ most_sk(sk)->channel_type == most_cb(skb)->channel_type
+ && most_sk(sk)->rx_channel == most_cb(skb)->channel &&
+ sk->sk_state == MOST_BOUND) {
+
+ struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
+ if (nskb)
+ if (sock_queue_rcv_skb(sk, nskb))
+ kfree_skb(nskb);
+ }
+
+ }
+ read_unlock(&most_sk_list.lock);
+
+ return 0;
+}
+EXPORT_SYMBOL(most_send_to_sock);
+
+static int most_sock_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct most_dev *mdev;
+
+ pr_debug("%s: sock %p sk %p\n", __func__, sock, sk);
+
+ if (!sk)
+ return 0;
+
+ mdev = most_sk(sk)->mdev;
+
+ most_sock_unlink(sk);
+
+ if (mdev) {
+ if (sk->sk_state == MOST_BOUND)
+ most_configure_channels(mdev, most_sk(sk), 0);
+
+ most_dev_put(mdev);
+ }
+
+ sock_orphan(sk);
+ sock_put(sk);
+ return 0;
+}
+
+static int most_sock_bind(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ struct sockaddr_most *maddr = (struct sockaddr_most *)addr;
+ struct sock *sk = sock->sk;
+ struct most_dev *mdev = NULL;
+ int err = 0;
+
+ if (!maddr || maddr->most_family != AF_MOST)
+ return -EINVAL;
+
+ pr_debug("%s: sock %p sk %p, rx: %d, tx: %d\n",
+ __func__, sock, sk, maddr->rx_channel, maddr->tx_channel);
+
+ lock_sock(sk);
+
+ if (sk->sk_state != MOST_OPEN) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ if (most_sk(sk)->mdev) {
+ err = -EALREADY;
+ goto done;
+ }
+
+ if (channel_in_use(maddr->most_dev, maddr->rx_channel) ||
+ channel_in_use(maddr->most_dev, maddr->tx_channel)) {
+ err = -EADDRINUSE;
+ goto done;
+ } else {
+ most_sk(sk)->rx_channel = maddr->rx_channel;
+ most_sk(sk)->tx_channel = maddr->tx_channel;
+ }
+
+ mdev = most_dev_get(maddr->most_dev);
+ if (!mdev) {
+ err = -ENODEV;
+ goto done;
+ }
+
+ err = most_configure_channels(mdev, most_sk(sk), 1);
+ if (err) {
+ most_dev_put(mdev);
+ goto done;
+ }
+
+ most_sk(sk)->mdev = mdev;
+ most_sk(sk)->dev_id = mdev->id;
+
+ sk->sk_state = MOST_BOUND;
+
+done:
+ release_sock(sk);
+ return err;
+}
+
+
+static int most_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ pr_debug("%s\n", __func__);
+ return -EINVAL;
+}
+
+static int most_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len, int flags)
+{
+ int noblock = flags & MSG_DONTWAIT;
+ struct sock *sk = sock->sk;
+ struct sk_buff *skb;
+ int copied, err;
+
+ pr_debug("%s\n", __func__);
+
+ if (most_sk(sk)->rx_channel == MOST_NO_CHANNEL)
+ return -EOPNOTSUPP;
+
+ if (flags & (MSG_OOB))
+ return -EOPNOTSUPP;
+
+ if (sk->sk_state != MOST_BOUND)
+ return 0;
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ return err;
+
+ msg->msg_namelen = 0;
+
+ copied = skb->len;
+ if (len < copied) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+
+ skb_reset_transport_header(skb);
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+
+ skb_free_datagram(sk, skb);
+
+ return err ? : copied;
+}
+
+static int most_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct most_dev *mdev;
+ struct sk_buff *skb;
+ int err;
+
+ pr_debug("%s: sock %p sk %p, channeltype: %d\n",
+ __func__, sock, sk, most_sk(sk)->channel_type);
+
+ if (most_sk(sk)->tx_channel == MOST_NO_CHANNEL)
+ return -EOPNOTSUPP;
+
+ if (msg->msg_flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
+ return -EINVAL;
+
+ lock_sock(sk);
+
+ mdev = most_sk(sk)->mdev;
+ if (!mdev) {
+ err = -EBADFD;
+ goto done;
+ }
+
+ skb = sock_alloc_send_skb(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
+ if (!skb)
+ goto done;
+
+ most_cb(skb)->channel = most_sk(sk)->tx_channel;
+ most_cb(skb)->channel_type = most_sk(sk)->channel_type;
+
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+ err = -EFAULT;
+ goto drop;
+ }
+
+ skb->dev = (void *) mdev;
+
+ skb_queue_tail(&mdev->ctl_q, skb);
+ most_sched_tx(mdev);
+
+ err = len;
+
+done:
+ release_sock(sk);
+ return err;
+
+drop:
+ kfree_skb(skb);
+ goto done;
+}
+
+static int most_sock_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ pr_debug("%s: sk %p", __func__, sk);
+
+ lock_sock(sk);
+
+ switch (optname) {
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int most_sock_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ int err = 0;
+
+ pr_debug("%s: sk %p", __func__, sk);
+
+ lock_sock(sk);
+
+ switch (optname) {
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+
+ release_sock(sk);
+ return err;
+}
+
+static int most_sock_getname(struct socket *sock, struct sockaddr *addr,
+ int *addr_len, int peer)
+{
+ struct sockaddr_most *maddr = (struct sockaddr_most *)addr;
+ struct sock *sk = sock->sk;
+ struct most_dev *mdev = most_sk(sk)->mdev;
+
+ if (!mdev)
+ return -EBADFD;
+
+ lock_sock(sk);
+
+ *addr_len = sizeof(struct sockaddr_most);
+ maddr->most_family = AF_MOST;
+ maddr->most_dev = mdev->id;
+ /* FIXME dev_sock did not use rx and tx */
+ maddr->rx_channel = most_sk(sk)->rx_channel;
+ maddr->tx_channel = most_sk(sk)->tx_channel;
+
+ release_sock(sk);
+ return 0;
+}
+
+static const struct proto_ops most_sock_ops = {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .release = most_sock_release,
+ .bind = most_sock_bind,
+ .getname = most_sock_getname,
+ .sendmsg = most_sock_sendmsg,
+ .recvmsg = most_sock_recvmsg,
+ .ioctl = most_sock_ioctl,
+ .poll = datagram_poll,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = most_sock_setsockopt,
+ .getsockopt = most_sock_getsockopt,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .mmap = sock_no_mmap
+};
+
+
+static int dev_sock_ioctl(struct socket *sock, unsigned int cmd,
+ unsigned long arg)
+{
+ void __user *argp = (void __user *) arg;
+
+ switch (cmd) {
+ case MOSTDEVUP:
+ return most_open_dev(arg & 0xffff);
+ case MOSTDEVDOWN:
+ return most_close_dev(arg & 0xffff);
+ case MOSTGETDEVLIST:
+ return most_get_dev_list(argp);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int dev_sock_bind(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ return -ENOSYS;
+}
+
+static int dev_sock_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ return -ENOSYS;
+}
+
+static int dev_sock_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ return -ENOSYS;
+}
+
+static const struct proto_ops dev_sock_ops = {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .release = most_sock_release,
+ .bind = dev_sock_bind,
+ .getname = most_sock_getname,
+ .sendmsg = sock_no_sendmsg,
+ .recvmsg = sock_no_recvmsg,
+ .ioctl = dev_sock_ioctl,
+ .poll = sock_no_poll,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = dev_sock_setsockopt,
+ .getsockopt = dev_sock_getsockopt,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .mmap = sock_no_mmap
+};
+
+int ctl_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
+ struct msghdr *msg, size_t len)
+{
+ if (len != CTL_FRAME_SIZE)
+ return -EINVAL;
+
+ return most_sock_sendmsg(iocb, sock, msg, len);
+}
+
+static const struct proto_ops ctl_sock_ops = {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .release = most_sock_release,
+ .bind = most_sock_bind,
+ .getname = most_sock_getname,
+ .sendmsg = most_sock_sendmsg,
+ .recvmsg = most_sock_recvmsg,
+ .ioctl = most_sock_ioctl,
+ .poll = datagram_poll,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = most_sock_setsockopt,
+ .getsockopt = most_sock_getsockopt,
+ .connect = sock_no_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .mmap = sock_no_mmap
+};
+
+
+/* * * * * * * * * * * * * * SOCKET CREATION * * * * * * * * * * * * */
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key most_lock_key[MOST_MAX_PROTO];
+static const char *most_key_strings[MOST_MAX_PROTO] = {
+ "sk_lock-AF_MOST-MOSTPROTO_DEV",
+ "sk_lock-AF_MOST-MOSTPROTO_CTL",
+ "sk_lock-AF_MOST-MOSTPROTO_SYNC",
+ "sk_lock-AF_MOST-MOSTPROTO_ASYNC",
+};
+
+static struct lock_class_key most_slock_key[MOST_MAX_PROTO];
+static const char *most_slock_key_strings[MOST_MAX_PROTO] = {
+ "slock-AF_MOST-MOSTPROTO_DEV",
+ "slock-AF_MOST-MOSTPROTO_CTL",
+ "slock-AF_MOST-MOSTPROTO_SYNC",
+ "slock-AF_MOST-MOSTPROTO_ASYNC",
+};
+
+static inline void most_sock_reclassify_lock(struct socket *sock, int proto)
+{
+ struct sock *sk = sock->sk;
+
+ if (!sk)
+ return;
+
+ BUG_ON(sock_owned_by_user(sk));
+
+ sock_lock_init_class_and_name(sk,
+ most_slock_key_strings[proto], &most_slock_key[proto],
+ most_key_strings[proto], &most_lock_key[proto]);
+}
+#else
+static inline void most_sock_reclassify_lock(struct socket *sock, int proto)
+{
+}
+#endif
+
+
+static int most_sock_create(struct net *net, struct socket *sock, int proto,
+ int kern)
+{
+ if (net != &init_net)
+ return -EAFNOSUPPORT;
+
+ if (proto < 0 || proto >= MOST_MAX_PROTO)
+ return -EINVAL;
+
+ most_net_proto_family_ops[proto].create(net, sock, proto, kern);
+ most_sock_reclassify_lock(sock, proto);
+
+ return 0;
+}
+
+static struct net_proto_family most_sock_family_ops = {
+ .owner = THIS_MODULE,
+ .family = PF_MOST,
+ .create = most_sock_create,
+};
+
+static int dev_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_RAW)
+ return -ESOCKTNOSUPPORT;
+
+ sock->ops = &dev_sock_ops;
+
+ sk = most_sk_alloc(net, &most_proto[CHAN_DEV], CHAN_DEV);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = protocol;
+
+ sock->state = SS_UNCONNECTED;
+ sk->sk_state = MOST_OPEN;
+
+ most_sock_link(sk);
+ return 0;
+}
+
+static int ctl_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_RAW)
+ return -ESOCKTNOSUPPORT;
+
+ sock->ops = &ctl_sock_ops;
+
+ sk = most_sk_alloc(net, &most_proto[CHAN_CTL], CHAN_CTL);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = protocol;
+
+ sock->state = SS_UNCONNECTED;
+ sk->sk_state = MOST_OPEN;
+
+ most_sock_link(sk);
+ return 0;
+}
+
+static int sync_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_STREAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->ops = &most_sock_ops;
+
+ sk = most_sk_alloc(net, &most_proto[CHAN_SYNC], CHAN_SYNC);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = protocol;
+
+ sock->state = SS_UNCONNECTED;
+ sk->sk_state = MOST_OPEN;
+
+ most_sock_link(sk);
+ return 0;
+}
+
+static int async_sock_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct sock *sk;
+
+ if (sock->type != SOCK_DGRAM)
+ return -ESOCKTNOSUPPORT;
+
+ sock->ops = &most_sock_ops;
+
+ sk = most_sk_alloc(net, &most_proto[CHAN_ASYNC], CHAN_ASYNC);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ sk->sk_protocol = protocol;
+
+ sock->state = SS_UNCONNECTED;
+ sk->sk_state = MOST_OPEN;
+
+ most_sock_link(sk);
+ return 0;
+}
+
+
+/* * * * * * * * * * * * * * DEVICE REGISTRATION * * * * * * * * * * * * */
+
+int most_open_dev(u16 dev_id)
+{
+ struct most_dev *mdev = most_dev_get(dev_id);
+ int err = 0;
+
+ if (!mdev)
+ return -ENODEV;
+
+ pr_debug("%s: %s, state: %d\n", __func__, mdev->name, mdev->state);
+
+ if (mdev->state == MOST_DEV_UP)
+ err = -EALREADY;
+
+ if (!err)
+ err = mdev->open(mdev);
+ if (!err)
+ mdev->state = MOST_DEV_UP;
+
+ most_dev_put(mdev);
+ pr_debug("%s: %s, state: %d, err: %d\n", __func__,
+ mdev->name, mdev->state, err);
+ return err;
+}
+
+static int __most_close_dev(struct most_dev *mdev)
+{
+ int err = 0;
+
+ pr_debug("%s: %s, state: %d\n", __func__, mdev ? mdev->name : "nil",
+ mdev ? mdev->state : -1);
+
+ if (!mdev)
+ return -ENODEV;
+
+ if (mdev->state == MOST_DEV_DOWN)
+ err = -EALREADY;
+
+ if (!err)
+ err = mdev->close(mdev);
+ if (!err)
+ mdev->state = MOST_DEV_DOWN;
+
+ most_dev_put(mdev);
+ pr_debug("%s: %s, state: %d, err: %d\n", __func__,
+ mdev->name, mdev->state, err);
+ return err;
+}
+
+int most_close_dev(u16 dev_id)
+{
+ return __most_close_dev(most_dev_get(dev_id));
+}
+
+int most_get_dev_list(void __user *arg)
+{
+ struct most_dev_list_req *dl;
+ struct most_dev_req *dr;
+ struct list_head *p;
+ int n = 0, size, err;
+ u16 dev_num;
+
+ if (get_user(dev_num, (u16 __user *) arg))
+ return -EFAULT;
+
+ if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr))
+ return -EINVAL;
+
+ size = sizeof(*dl) + dev_num * sizeof(*dr);
+
+ dl = kzalloc(size, GFP_KERNEL);
+ if (!dl)
+ return -ENOMEM;
+
+ dr = dl->dev_req;
+
+ read_lock_bh(&most_dev_list_lock);
+ list_for_each(p, &most_dev_list) {
+ struct most_dev *mdev;
+ mdev = list_entry(p, struct most_dev, list);
+ (dr + n)->dev_id = mdev->id;
+ if (++n >= dev_num)
+ break;
+ }
+ read_unlock_bh(&most_dev_list_lock);
+
+ dl->dev_num = n;
+ size = sizeof(*dl) + n * sizeof(*dr);
+
+ err = copy_to_user(arg, dl, size);
+ kfree(dl);
+
+ return err ? -EFAULT : 0;
+}
+
+static int most_send_frame(struct sk_buff *skb)
+{
+ struct most_dev *mdev = (struct most_dev *) skb->dev;
+
+ if (!mdev) {
+ kfree_skb(skb);
+ return -ENODEV;
+ }
+
+ pr_debug("%s: %s type %d len %d\n", __func__, mdev->name,
+ most_cb(skb)->channel_type, skb->len);
+
+ /* Get rid of skb owner, prior to sending to the driver. */
+ skb_orphan(skb);
+
+ return mdev->send(skb);
+}
+
+static void most_send_queue(struct sk_buff_head *q)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(q))) {
+ struct most_dev *mdev = (struct most_dev *)skb->dev;
+
+ pr_debug("%s: skb %p len %d\n", __func__, skb, skb->len);
+
+ if (!mdev->can_send || mdev->can_send(skb))
+ most_send_frame(skb);
+ else {
+ pr_debug("%s, could not send frame, requeueing\n",
+ __func__);
+ skb_queue_tail(q, skb);
+ break;
+ }
+ }
+}
+
+static void most_tx_task(unsigned long arg)
+{
+ struct most_dev *mdev = (struct most_dev *) arg;
+
+ pr_debug("%s: %s\n", __func__, mdev->name);
+
+ most_send_queue(&mdev->ctl_q);
+ most_send_queue(&mdev->sync_q);
+ most_send_queue(&mdev->async_q);
+}
+
+static void most_rx_task(unsigned long arg)
+{
+ struct most_dev *mdev = (struct most_dev *) arg;
+ struct sk_buff *skb = skb_dequeue(&mdev->rx_q);
+
+ pr_debug("%s: %s\n", __func__, mdev->name);
+
+ while (skb) {
+ /* Send to the sockets */
+ most_send_to_sock(mdev->id, skb);
+ kfree_skb(skb);
+ skb = skb_dequeue(&mdev->rx_q);
+ }
+}
+
+
+/* Get MOST device by index.
+ * Device is held on return. */
+struct most_dev *most_dev_get(int index)
+{
+ struct most_dev *mdev = NULL;
+ struct list_head *p;
+
+ if (index < 0)
+ return NULL;
+
+ read_lock(&most_dev_list_lock);
+ list_for_each(p, &most_dev_list) {
+ struct most_dev *d = list_entry(p, struct most_dev, list);
+ if (d->id == index) {
+ mdev = most_dev_hold(d);
+ break;
+ }
+ }
+ read_unlock(&most_dev_list_lock);
+ return mdev;
+}
+EXPORT_SYMBOL(most_dev_get);
+
+
+/* Alloc MOST device */
+struct most_dev *most_alloc_dev(void)
+{
+ struct most_dev *mdev;
+
+ mdev = kzalloc(sizeof(struct most_dev), GFP_KERNEL);
+ if (!mdev)
+ return NULL;
+
+ mdev->state = MOST_DEV_DOWN;
+
+ return mdev;
+}
+EXPORT_SYMBOL(most_alloc_dev);
+
+
+void most_free_dev(struct most_dev *mdev)
+{
+ kfree(mdev);
+}
+EXPORT_SYMBOL(most_free_dev);
+
+
+/* Register MOST device */
+int most_register_dev(struct most_dev *mdev)
+{
+ struct list_head *head = &most_dev_list, *p;
+ int id = 0;
+
+ if (!mdev->open || !mdev->close || !mdev->send)
+ return -EINVAL;
+
+ write_lock_bh(&most_dev_list_lock);
+
+ /* Find first available device id */
+ list_for_each(p, &most_dev_list) {
+ if (list_entry(p, struct most_dev, list)->id != id)
+ break;
+ head = p; id++;
+ }
+
+ sprintf(mdev->name, "most%d", id);
+ mdev->id = id;
+ list_add(&mdev->list, head);
+
+ tasklet_init(&mdev->rx_task, most_rx_task, (unsigned long) mdev);
+ tasklet_init(&mdev->tx_task, most_tx_task, (unsigned long) mdev);
+
+ skb_queue_head_init(&mdev->rx_q);
+ skb_queue_head_init(&mdev->ctl_q);
+ skb_queue_head_init(&mdev->sync_q);
+ skb_queue_head_init(&mdev->async_q);
+
+ write_unlock_bh(&most_dev_list_lock);
+ return 0;
+}
+EXPORT_SYMBOL(most_register_dev);
+
+int most_unregister_dev(struct most_dev *mdev)
+{
+ int ret = 0;
+ pr_debug("%s: %s: state: %d\n", __func__, mdev->name, mdev->state);
+
+ if (mdev->state != MOST_DEV_DOWN)
+ ret = __most_close_dev(mdev);
+
+ write_lock_bh(&most_dev_list_lock);
+ list_del(&mdev->list);
+ write_unlock_bh(&most_dev_list_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL(most_unregister_dev);
+
+
+static struct net_proto_family most_net_proto_family_ops[] = {
+ {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .create = dev_sock_create,
+ },
+ {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .create = ctl_sock_create,
+ },
+ {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .create = sync_sock_create,
+ },
+ {
+ .family = PF_MOST,
+ .owner = THIS_MODULE,
+ .create = async_sock_create,
+ }
+};
+
+static struct proto most_proto[] = {
+ {
+ .name = "DEV",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct most_sock)
+ },
+ {
+ .name = "CTL",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct most_sock)
+ },
+ {
+ .name = "SYNC",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct most_sock)
+ },
+ {
+ .name = "ASYNC",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct most_sock)
+ }
+};
+
+static int __init most_init(void)
+{
+ int i, err;
+
+ err = sock_register(&most_sock_family_ops);
+ if (err < 0)
+ return err;
+
+ for (i = 0; i < ARRAY_SIZE(most_proto); ++i) {
+ err = proto_register(&most_proto[i], 0);
+ if (err)
+ goto out;
+ }
+
+ pr_info(KERN_INFO "MOST is initialized\n");
+
+ return 0;
+out:
+ while (--i >= 0)
+ proto_unregister(&most_proto[i]);
+
+ return err;
+}
+
+static void __exit most_exit(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(most_proto); ++i)
+ proto_unregister(&most_proto[i]);
+
+ sock_unregister(PF_MOST);
+}
+
+subsys_initcall(most_init);
+module_exit(most_exit);
+
+MODULE_DESCRIPTION("MOST Core");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_NETPROTO(PF_MOST);
--
1.7.7.2
--
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