![Martin Schwidefsky](/assets/img/avatar_default.png)
The message limit on the iucv connect call for the smsg module is too low. Therefore increase the smsg message limit to 255. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
190 lines
4.7 KiB
C
190 lines
4.7 KiB
C
/*
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* IUCV special message driver
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*
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* Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <asm/cpcmd.h>
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#include <asm/ebcdic.h>
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#include "iucv.h"
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struct smsg_callback {
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struct list_head list;
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char *prefix;
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int len;
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void (*callback)(char *from, char *str);
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};
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MODULE_AUTHOR
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("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
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MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
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static iucv_handle_t smsg_handle;
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static unsigned short smsg_pathid;
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static DEFINE_SPINLOCK(smsg_list_lock);
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static struct list_head smsg_list = LIST_HEAD_INIT(smsg_list);
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static void
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smsg_connection_complete(iucv_ConnectionComplete *eib, void *pgm_data)
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{
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}
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static void
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smsg_message_pending(iucv_MessagePending *eib, void *pgm_data)
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{
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struct smsg_callback *cb;
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unsigned char *msg;
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unsigned char sender[9];
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unsigned short len;
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int rc, i;
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len = eib->ln1msg2.ipbfln1f;
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msg = kmalloc(len + 1, GFP_ATOMIC|GFP_DMA);
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if (!msg) {
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iucv_reject(eib->ippathid, eib->ipmsgid, eib->iptrgcls);
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return;
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}
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rc = iucv_receive(eib->ippathid, eib->ipmsgid, eib->iptrgcls,
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msg, len, 0, 0, 0);
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if (rc == 0) {
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msg[len] = 0;
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EBCASC(msg, len);
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memcpy(sender, msg, 8);
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sender[8] = 0;
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/* Remove trailing whitespace from the sender name. */
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for (i = 7; i >= 0; i--) {
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if (sender[i] != ' ' && sender[i] != '\t')
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break;
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sender[i] = 0;
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}
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spin_lock(&smsg_list_lock);
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list_for_each_entry(cb, &smsg_list, list)
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if (strncmp(msg + 8, cb->prefix, cb->len) == 0) {
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cb->callback(sender, msg + 8);
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break;
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}
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spin_unlock(&smsg_list_lock);
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}
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kfree(msg);
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}
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static iucv_interrupt_ops_t smsg_ops = {
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.ConnectionComplete = smsg_connection_complete,
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.MessagePending = smsg_message_pending,
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};
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static struct device_driver smsg_driver = {
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.name = "SMSGIUCV",
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.bus = &iucv_bus,
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};
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int
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smsg_register_callback(char *prefix, void (*callback)(char *from, char *str))
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{
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struct smsg_callback *cb;
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cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
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if (!cb)
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return -ENOMEM;
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cb->prefix = prefix;
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cb->len = strlen(prefix);
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cb->callback = callback;
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spin_lock(&smsg_list_lock);
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list_add_tail(&cb->list, &smsg_list);
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spin_unlock(&smsg_list_lock);
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return 0;
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}
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void
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smsg_unregister_callback(char *prefix, void (*callback)(char *from, char *str))
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{
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struct smsg_callback *cb, *tmp;
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spin_lock(&smsg_list_lock);
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cb = 0;
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list_for_each_entry(tmp, &smsg_list, list)
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if (tmp->callback == callback &&
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strcmp(tmp->prefix, prefix) == 0) {
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cb = tmp;
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list_del(&cb->list);
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break;
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}
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spin_unlock(&smsg_list_lock);
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kfree(cb);
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}
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static void __exit
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smsg_exit(void)
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{
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if (smsg_handle > 0) {
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cpcmd("SET SMSG OFF", NULL, 0, NULL);
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iucv_sever(smsg_pathid, 0);
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iucv_unregister_program(smsg_handle);
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driver_unregister(&smsg_driver);
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}
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return;
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}
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static int __init
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smsg_init(void)
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{
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static unsigned char pgmmask[24] = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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int rc;
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rc = driver_register(&smsg_driver);
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if (rc != 0) {
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printk(KERN_ERR "SMSGIUCV: failed to register driver.\n");
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return rc;
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}
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smsg_handle = iucv_register_program("SMSGIUCV ", "*MSG ",
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pgmmask, &smsg_ops, 0);
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if (!smsg_handle) {
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printk(KERN_ERR "SMSGIUCV: failed to register to iucv");
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driver_unregister(&smsg_driver);
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return -EIO; /* better errno ? */
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}
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rc = iucv_connect (&smsg_pathid, 255, 0, "*MSG ", 0, 0, 0, 0,
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smsg_handle, 0);
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if (rc) {
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printk(KERN_ERR "SMSGIUCV: failed to connect to *MSG");
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iucv_unregister_program(smsg_handle);
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driver_unregister(&smsg_driver);
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smsg_handle = 0;
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return -EIO;
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}
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cpcmd("SET SMSG IUCV", NULL, 0, NULL);
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return 0;
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}
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module_init(smsg_init);
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module_exit(smsg_exit);
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(smsg_register_callback);
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EXPORT_SYMBOL(smsg_unregister_callback);
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