/*
- * linux/net/iucv/af_iucv.c
- *
* IUCV protocol stack for Linux on zSeries
*
- * Copyright 2006 IBM Corporation
+ * Copyright IBM Corp. 2006, 2009
*
* Author(s): Jennifer Hunt <jenhunt@us.ibm.com>
+ * Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
+ * PM functions:
+ * Ursula Braun <ursula.braun@de.ibm.com>
*/
#define KMSG_COMPONENT "af_iucv"
#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
#define CB_TRGCLS_LEN (TRGCLS_SIZE)
+#define __iucv_sock_wait(sk, condition, timeo, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ long __timeo = timeo; \
+ ret = 0; \
+ while (!(condition)) { \
+ prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
+ if (!__timeo) { \
+ ret = -EAGAIN; \
+ break; \
+ } \
+ if (signal_pending(current)) { \
+ ret = sock_intr_errno(__timeo); \
+ break; \
+ } \
+ release_sock(sk); \
+ __timeo = schedule_timeout(__timeo); \
+ lock_sock(sk); \
+ ret = sock_error(sk); \
+ if (ret) \
+ break; \
+ } \
+ finish_wait(sk->sk_sleep, &__wait); \
+} while (0)
+
+#define iucv_sock_wait(sk, condition, timeo) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __iucv_sock_wait(sk, condition, timeo, __ret); \
+ __ret; \
+})
static void iucv_sock_kill(struct sock *sk);
static void iucv_sock_close(struct sock *sk);
memcpy(&dst[8], src, 8);
}
+static int afiucv_pm_prepare(struct device *dev)
+{
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "afiucv_pm_prepare\n");
+#endif
+ return 0;
+}
+
+static void afiucv_pm_complete(struct device *dev)
+{
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "afiucv_pm_complete\n");
+#endif
+ return;
+}
+
+/**
+ * afiucv_pm_freeze() - Freeze PM callback
+ * @dev: AFIUCV dummy device
+ *
+ * Sever all established IUCV communication pathes
+ */
+static int afiucv_pm_freeze(struct device *dev)
+{
+ struct iucv_sock *iucv;
+ struct sock *sk;
+ struct hlist_node *node;
+ int err = 0;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "afiucv_pm_freeze\n");
+#endif
+ read_lock(&iucv_sk_list.lock);
+ sk_for_each(sk, node, &iucv_sk_list.head) {
+ iucv = iucv_sk(sk);
+ skb_queue_purge(&iucv->send_skb_q);
+ skb_queue_purge(&iucv->backlog_skb_q);
+ switch (sk->sk_state) {
+ case IUCV_SEVERED:
+ case IUCV_DISCONN:
+ case IUCV_CLOSING:
+ case IUCV_CONNECTED:
+ if (iucv->path) {
+ err = iucv_path_sever(iucv->path, NULL);
+ iucv_path_free(iucv->path);
+ iucv->path = NULL;
+ }
+ break;
+ case IUCV_OPEN:
+ case IUCV_BOUND:
+ case IUCV_LISTEN:
+ case IUCV_CLOSED:
+ default:
+ break;
+ }
+ }
+ read_unlock(&iucv_sk_list.lock);
+ return err;
+}
+
+/**
+ * afiucv_pm_restore_thaw() - Thaw and restore PM callback
+ * @dev: AFIUCV dummy device
+ *
+ * socket clean up after freeze
+ */
+static int afiucv_pm_restore_thaw(struct device *dev)
+{
+ struct iucv_sock *iucv;
+ struct sock *sk;
+ struct hlist_node *node;
+
+#ifdef CONFIG_PM_DEBUG
+ printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
+#endif
+ read_lock(&iucv_sk_list.lock);
+ sk_for_each(sk, node, &iucv_sk_list.head) {
+ iucv = iucv_sk(sk);
+ switch (sk->sk_state) {
+ case IUCV_CONNECTED:
+ sk->sk_err = EPIPE;
+ sk->sk_state = IUCV_DISCONN;
+ sk->sk_state_change(sk);
+ break;
+ case IUCV_DISCONN:
+ case IUCV_SEVERED:
+ case IUCV_CLOSING:
+ case IUCV_LISTEN:
+ case IUCV_BOUND:
+ case IUCV_OPEN:
+ default:
+ break;
+ }
+ }
+ read_unlock(&iucv_sk_list.lock);
+ return 0;
+}
+
+static struct dev_pm_ops afiucv_pm_ops = {
+ .prepare = afiucv_pm_prepare,
+ .complete = afiucv_pm_complete,
+ .freeze = afiucv_pm_freeze,
+ .thaw = afiucv_pm_restore_thaw,
+ .restore = afiucv_pm_restore_thaw,
+};
+
+static struct device_driver af_iucv_driver = {
+ .owner = THIS_MODULE,
+ .name = "afiucv",
+ .bus = &iucv_bus,
+ .pm = &afiucv_pm_ops,
+};
+
+/* dummy device used as trigger for PM functions */
+static struct device *af_iucv_dev;
+
/**
* iucv_msg_length() - Returns the length of an iucv message.
* @msg: Pointer to struct iucv_message, MUST NOT be NULL
return msg->length;
}
+/**
+ * iucv_sock_in_state() - check for specific states
+ * @sk: sock structure
+ * @state: first iucv sk state
+ * @state: second iucv sk state
+ *
+ * Returns true if the socket in either in the first or second state.
+ */
+static int iucv_sock_in_state(struct sock *sk, int state, int state2)
+{
+ return (sk->sk_state == state || sk->sk_state == state2);
+}
+
+/**
+ * iucv_below_msglim() - function to check if messages can be sent
+ * @sk: sock structure
+ *
+ * Returns true if the send queue length is lower than the message limit.
+ * Always returns true if the socket is not connected (no iucv path for
+ * checking the message limit).
+ */
+static inline int iucv_below_msglim(struct sock *sk)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+
+ if (sk->sk_state != IUCV_CONNECTED)
+ return 1;
+ return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
+}
+
+/**
+ * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
+ */
+static void iucv_sock_wake_msglim(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+ if (sk_has_sleeper(sk))
+ wake_up_interruptible_all(sk->sk_sleep);
+ sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+ read_unlock(&sk->sk_callback_lock);
+}
+
/* Timers */
static void iucv_sock_timeout(unsigned long arg)
{
timeo = sk->sk_lingertime;
else
timeo = IUCV_DISCONN_TIMEOUT;
- err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
+ err = iucv_sock_wait(sk,
+ iucv_sock_in_state(sk, IUCV_CLOSED, 0),
+ timeo);
}
case IUCV_CLOSING: /* fall through */
return NULL;
}
-int iucv_sock_wait_state(struct sock *sk, int state, int state2,
- unsigned long timeo)
-{
- DECLARE_WAITQUEUE(wait, current);
- int err = 0;
-
- add_wait_queue(sk->sk_sleep, &wait);
- while (sk->sk_state != state && sk->sk_state != state2) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (!timeo) {
- err = -EAGAIN;
- break;
- }
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
-
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock(sk);
-
- err = sock_error(sk);
- if (err)
- break;
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk->sk_sleep, &wait);
- return err;
-}
-
/* Bind an unbound socket */
static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
int addr_len)
}
if (sk->sk_state != IUCV_CONNECTED) {
- err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
- sock_sndtimeo(sk, flags & O_NONBLOCK));
+ err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
+ IUCV_DISCONN),
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
}
if (sk->sk_state == IUCV_DISCONN) {
struct iucv_message txmsg;
struct cmsghdr *cmsg;
int cmsg_done;
+ long timeo;
char user_id[9];
char appl_id[9];
int err;
+ int noblock = msg->msg_flags & MSG_DONTWAIT;
err = sock_error(sk);
if (err)
goto out;
}
- if (sk->sk_state == IUCV_CONNECTED) {
- /* initialize defaults */
- cmsg_done = 0; /* check for duplicate headers */
- txmsg.class = 0;
+ /* Return if the socket is not in connected state */
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = -ENOTCONN;
+ goto out;
+ }
- /* iterate over control messages */
- for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
- cmsg = CMSG_NXTHDR(msg, cmsg)) {
+ /* initialize defaults */
+ cmsg_done = 0; /* check for duplicate headers */
+ txmsg.class = 0;
- if (!CMSG_OK(msg, cmsg)) {
- err = -EINVAL;
- goto out;
- }
+ /* iterate over control messages */
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
+ cmsg = CMSG_NXTHDR(msg, cmsg)) {
- if (cmsg->cmsg_level != SOL_IUCV)
- continue;
+ if (!CMSG_OK(msg, cmsg)) {
+ err = -EINVAL;
+ goto out;
+ }
- if (cmsg->cmsg_type & cmsg_done) {
+ if (cmsg->cmsg_level != SOL_IUCV)
+ continue;
+
+ if (cmsg->cmsg_type & cmsg_done) {
+ err = -EINVAL;
+ goto out;
+ }
+ cmsg_done |= cmsg->cmsg_type;
+
+ switch (cmsg->cmsg_type) {
+ case SCM_IUCV_TRGCLS:
+ if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
err = -EINVAL;
goto out;
}
- cmsg_done |= cmsg->cmsg_type;
-
- switch (cmsg->cmsg_type) {
- case SCM_IUCV_TRGCLS:
- if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
- err = -EINVAL;
- goto out;
- }
- /* set iucv message target class */
- memcpy(&txmsg.class,
- (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
+ /* set iucv message target class */
+ memcpy(&txmsg.class,
+ (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
- break;
+ break;
- default:
- err = -EINVAL;
- goto out;
- break;
- }
+ default:
+ err = -EINVAL;
+ goto out;
+ break;
}
+ }
- /* allocate one skb for each iucv message:
- * this is fine for SOCK_SEQPACKET (unless we want to support
- * segmented records using the MSG_EOR flag), but
- * for SOCK_STREAM we might want to improve it in future */
- if (!(skb = sock_alloc_send_skb(sk, len,
- msg->msg_flags & MSG_DONTWAIT,
- &err)))
- goto out;
+ /* allocate one skb for each iucv message:
+ * this is fine for SOCK_SEQPACKET (unless we want to support
+ * segmented records using the MSG_EOR flag), but
+ * for SOCK_STREAM we might want to improve it in future */
+ skb = sock_alloc_send_skb(sk, len, noblock, &err);
+ if (!skb)
+ goto out;
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+ err = -EFAULT;
+ goto fail;
+ }
- if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
- err = -EFAULT;
- goto fail;
- }
+ /* wait if outstanding messages for iucv path has reached */
+ timeo = sock_sndtimeo(sk, noblock);
+ err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
+ if (err)
+ goto fail;
- /* increment and save iucv message tag for msg_completion cbk */
- txmsg.tag = iucv->send_tag++;
- memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
- skb_queue_tail(&iucv->send_skb_q, skb);
+ /* return -ECONNRESET if the socket is no longer connected */
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = -ECONNRESET;
+ goto fail;
+ }
- if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
- && skb->len <= 7) {
- err = iucv_send_iprm(iucv->path, &txmsg, skb);
+ /* increment and save iucv message tag for msg_completion cbk */
+ txmsg.tag = iucv->send_tag++;
+ memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
+ skb_queue_tail(&iucv->send_skb_q, skb);
- /* on success: there is no message_complete callback
- * for an IPRMDATA msg; remove skb from send queue */
- if (err == 0) {
- skb_unlink(skb, &iucv->send_skb_q);
- kfree_skb(skb);
- }
+ if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
+ && skb->len <= 7) {
+ err = iucv_send_iprm(iucv->path, &txmsg, skb);
- /* this error should never happen since the
- * IUCV_IPRMDATA path flag is set... sever path */
- if (err == 0x15) {
- iucv_path_sever(iucv->path, NULL);
- skb_unlink(skb, &iucv->send_skb_q);
- err = -EPIPE;
- goto fail;
- }
- } else
- err = iucv_message_send(iucv->path, &txmsg, 0, 0,
- (void *) skb->data, skb->len);
- if (err) {
- if (err == 3) {
- user_id[8] = 0;
- memcpy(user_id, iucv->dst_user_id, 8);
- appl_id[8] = 0;
- memcpy(appl_id, iucv->dst_name, 8);
- pr_err("Application %s on z/VM guest %s"
- " exceeds message limit\n",
- user_id, appl_id);
- }
+ /* on success: there is no message_complete callback
+ * for an IPRMDATA msg; remove skb from send queue */
+ if (err == 0) {
+ skb_unlink(skb, &iucv->send_skb_q);
+ kfree_skb(skb);
+ }
+
+ /* this error should never happen since the
+ * IUCV_IPRMDATA path flag is set... sever path */
+ if (err == 0x15) {
+ iucv_path_sever(iucv->path, NULL);
skb_unlink(skb, &iucv->send_skb_q);
err = -EPIPE;
goto fail;
}
-
- } else {
- err = -ENOTCONN;
- goto out;
+ } else
+ err = iucv_message_send(iucv->path, &txmsg, 0, 0,
+ (void *) skb->data, skb->len);
+ if (err) {
+ if (err == 3) {
+ user_id[8] = 0;
+ memcpy(user_id, iucv->dst_user_id, 8);
+ appl_id[8] = 0;
+ memcpy(appl_id, iucv->dst_name, 8);
+ pr_err("Application %s on z/VM guest %s"
+ " exceeds message limit\n",
+ appl_id, user_id);
+ err = -EAGAIN;
+ } else
+ err = -EPIPE;
+ skb_unlink(skb, &iucv->send_skb_q);
+ goto fail;
}
release_sock(sk);
struct sock *sk = sock->sk;
unsigned int mask = 0;
- poll_wait(file, sk->sk_sleep, wait);
+ sock_poll_wait(file, sk->sk_sleep, wait);
if (sk->sk_state == IUCV_LISTEN)
return iucv_accept_poll(sk);
spin_unlock_irqrestore(&list->lock, flags);
- kfree_skb(this);
+ if (this) {
+ kfree_skb(this);
+ /* wake up any process waiting for sending */
+ iucv_sock_wake_msglim(sk);
+ }
}
BUG_ON(!this);
err = sock_register(&iucv_sock_family_ops);
if (err)
goto out_proto;
+ /* establish dummy device */
+ err = driver_register(&af_iucv_driver);
+ if (err)
+ goto out_sock;
+ af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
+ if (!af_iucv_dev) {
+ err = -ENOMEM;
+ goto out_driver;
+ }
+ dev_set_name(af_iucv_dev, "af_iucv");
+ af_iucv_dev->bus = &iucv_bus;
+ af_iucv_dev->parent = iucv_root;
+ af_iucv_dev->release = (void (*)(struct device *))kfree;
+ af_iucv_dev->driver = &af_iucv_driver;
+ err = device_register(af_iucv_dev);
+ if (err)
+ goto out_driver;
+
return 0;
+out_driver:
+ driver_unregister(&af_iucv_driver);
+out_sock:
+ sock_unregister(PF_IUCV);
out_proto:
proto_unregister(&iucv_proto);
out_iucv:
static void __exit afiucv_exit(void)
{
+ device_unregister(af_iucv_dev);
+ driver_unregister(&af_iucv_driver);
sock_unregister(PF_IUCV);
proto_unregister(&iucv_proto);
iucv_unregister(&af_iucv_handler, 0);
git.openpandora.org / pandora-kernel.git / blobdiff