![Ursula Braun](/assets/img/avatar_default.png)
The NETIUCV device driver allows to connect a Linux guest on z/VM to another z/VM guest based on the z/VM communication facility IUCV. Multiple output paths to different guests are possible, as well as multiple input paths from different guests. With this feature, you can configure multiple point-to-point NETIUCV interfaces between your Linux on System z instance and another z/VM guest. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2300 lines
59 KiB
C
2300 lines
59 KiB
C
/*
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* IUCV network driver
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*
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* Copyright IBM Corp. 2001, 2009
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*
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* Author(s):
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* Original netiucv driver:
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* Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
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* Sysfs integration and all bugs therein:
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* Cornelia Huck (cornelia.huck@de.ibm.com)
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* PM functions:
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* Ursula Braun (ursula.braun@de.ibm.com)
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*
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* Documentation used:
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* the source of the original IUCV driver by:
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* Stefan Hegewald <hegewald@de.ibm.com>
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* Hartmut Penner <hpenner@de.ibm.com>
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* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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* Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
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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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*/
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#define KMSG_COMPONENT "netiucv"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#undef DEBUG
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/timer.h>
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#include <linux/bitops.h>
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#include <linux/signal.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/ip.h>
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#include <linux/if_arp.h>
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#include <linux/tcp.h>
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#include <linux/skbuff.h>
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#include <linux/ctype.h>
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#include <net/dst.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/ebcdic.h>
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#include <net/iucv/iucv.h>
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#include "fsm.h"
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MODULE_AUTHOR
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("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)");
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MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver");
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/**
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* Debug Facility stuff
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*/
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#define IUCV_DBF_SETUP_NAME "iucv_setup"
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#define IUCV_DBF_SETUP_LEN 64
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#define IUCV_DBF_SETUP_PAGES 2
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#define IUCV_DBF_SETUP_NR_AREAS 1
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#define IUCV_DBF_SETUP_LEVEL 3
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#define IUCV_DBF_DATA_NAME "iucv_data"
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#define IUCV_DBF_DATA_LEN 128
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#define IUCV_DBF_DATA_PAGES 2
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#define IUCV_DBF_DATA_NR_AREAS 1
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#define IUCV_DBF_DATA_LEVEL 2
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#define IUCV_DBF_TRACE_NAME "iucv_trace"
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#define IUCV_DBF_TRACE_LEN 16
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#define IUCV_DBF_TRACE_PAGES 4
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#define IUCV_DBF_TRACE_NR_AREAS 1
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#define IUCV_DBF_TRACE_LEVEL 3
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#define IUCV_DBF_TEXT(name,level,text) \
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do { \
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debug_text_event(iucv_dbf_##name,level,text); \
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} while (0)
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#define IUCV_DBF_HEX(name,level,addr,len) \
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do { \
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debug_event(iucv_dbf_##name,level,(void*)(addr),len); \
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} while (0)
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DECLARE_PER_CPU(char[256], iucv_dbf_txt_buf);
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/* Allow to sort out low debug levels early to avoid wasted sprints */
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static inline int iucv_dbf_passes(debug_info_t *dbf_grp, int level)
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{
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return (level <= dbf_grp->level);
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}
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#define IUCV_DBF_TEXT_(name, level, text...) \
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do { \
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if (iucv_dbf_passes(iucv_dbf_##name, level)) { \
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char* __buf = get_cpu_var(iucv_dbf_txt_buf); \
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sprintf(__buf, text); \
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debug_text_event(iucv_dbf_##name, level, __buf); \
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put_cpu_var(iucv_dbf_txt_buf); \
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} \
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} while (0)
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#define IUCV_DBF_SPRINTF(name,level,text...) \
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do { \
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debug_sprintf_event(iucv_dbf_trace, level, ##text ); \
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debug_sprintf_event(iucv_dbf_trace, level, text ); \
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} while (0)
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/**
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* some more debug stuff
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*/
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#define IUCV_HEXDUMP16(importance,header,ptr) \
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PRINT_##importance(header "%02x %02x %02x %02x %02x %02x %02x %02x " \
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"%02x %02x %02x %02x %02x %02x %02x %02x\n", \
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*(((char*)ptr)),*(((char*)ptr)+1),*(((char*)ptr)+2), \
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*(((char*)ptr)+3),*(((char*)ptr)+4),*(((char*)ptr)+5), \
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*(((char*)ptr)+6),*(((char*)ptr)+7),*(((char*)ptr)+8), \
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*(((char*)ptr)+9),*(((char*)ptr)+10),*(((char*)ptr)+11), \
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*(((char*)ptr)+12),*(((char*)ptr)+13), \
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*(((char*)ptr)+14),*(((char*)ptr)+15)); \
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PRINT_##importance(header "%02x %02x %02x %02x %02x %02x %02x %02x " \
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"%02x %02x %02x %02x %02x %02x %02x %02x\n", \
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*(((char*)ptr)+16),*(((char*)ptr)+17), \
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*(((char*)ptr)+18),*(((char*)ptr)+19), \
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*(((char*)ptr)+20),*(((char*)ptr)+21), \
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*(((char*)ptr)+22),*(((char*)ptr)+23), \
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*(((char*)ptr)+24),*(((char*)ptr)+25), \
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*(((char*)ptr)+26),*(((char*)ptr)+27), \
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*(((char*)ptr)+28),*(((char*)ptr)+29), \
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*(((char*)ptr)+30),*(((char*)ptr)+31));
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#define PRINTK_HEADER " iucv: " /* for debugging */
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/* dummy device to make sure netiucv_pm functions are called */
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static struct device *netiucv_dev;
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static int netiucv_pm_prepare(struct device *);
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static void netiucv_pm_complete(struct device *);
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static int netiucv_pm_freeze(struct device *);
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static int netiucv_pm_restore_thaw(struct device *);
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static const struct dev_pm_ops netiucv_pm_ops = {
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.prepare = netiucv_pm_prepare,
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.complete = netiucv_pm_complete,
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.freeze = netiucv_pm_freeze,
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.thaw = netiucv_pm_restore_thaw,
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.restore = netiucv_pm_restore_thaw,
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};
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static struct device_driver netiucv_driver = {
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.owner = THIS_MODULE,
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.name = "netiucv",
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.bus = &iucv_bus,
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.pm = &netiucv_pm_ops,
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};
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static int netiucv_callback_connreq(struct iucv_path *,
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u8 ipvmid[8], u8 ipuser[16]);
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static void netiucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
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static void netiucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
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static void netiucv_callback_connsusp(struct iucv_path *, u8 ipuser[16]);
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static void netiucv_callback_connres(struct iucv_path *, u8 ipuser[16]);
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static void netiucv_callback_rx(struct iucv_path *, struct iucv_message *);
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static void netiucv_callback_txdone(struct iucv_path *, struct iucv_message *);
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static struct iucv_handler netiucv_handler = {
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.path_pending = netiucv_callback_connreq,
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.path_complete = netiucv_callback_connack,
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.path_severed = netiucv_callback_connrej,
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.path_quiesced = netiucv_callback_connsusp,
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.path_resumed = netiucv_callback_connres,
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.message_pending = netiucv_callback_rx,
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.message_complete = netiucv_callback_txdone
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};
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/**
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* Per connection profiling data
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*/
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struct connection_profile {
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unsigned long maxmulti;
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unsigned long maxcqueue;
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unsigned long doios_single;
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unsigned long doios_multi;
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unsigned long txlen;
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unsigned long tx_time;
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struct timespec send_stamp;
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unsigned long tx_pending;
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unsigned long tx_max_pending;
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};
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/**
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* Representation of one iucv connection
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*/
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struct iucv_connection {
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struct list_head list;
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struct iucv_path *path;
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struct sk_buff *rx_buff;
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struct sk_buff *tx_buff;
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struct sk_buff_head collect_queue;
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struct sk_buff_head commit_queue;
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spinlock_t collect_lock;
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int collect_len;
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int max_buffsize;
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fsm_timer timer;
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fsm_instance *fsm;
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struct net_device *netdev;
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struct connection_profile prof;
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char userid[9];
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char userdata[17];
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};
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/**
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* Linked list of all connection structs.
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*/
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static LIST_HEAD(iucv_connection_list);
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static DEFINE_RWLOCK(iucv_connection_rwlock);
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/**
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* Representation of event-data for the
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* connection state machine.
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*/
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struct iucv_event {
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struct iucv_connection *conn;
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void *data;
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};
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/**
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* Private part of the network device structure
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*/
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struct netiucv_priv {
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struct net_device_stats stats;
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unsigned long tbusy;
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fsm_instance *fsm;
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struct iucv_connection *conn;
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struct device *dev;
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int pm_state;
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};
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/**
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* Link level header for a packet.
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*/
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struct ll_header {
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u16 next;
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};
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#define NETIUCV_HDRLEN (sizeof(struct ll_header))
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#define NETIUCV_BUFSIZE_MAX 65537
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#define NETIUCV_BUFSIZE_DEFAULT NETIUCV_BUFSIZE_MAX
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#define NETIUCV_MTU_MAX (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN)
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#define NETIUCV_MTU_DEFAULT 9216
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#define NETIUCV_QUEUELEN_DEFAULT 50
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#define NETIUCV_TIMEOUT_5SEC 5000
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/**
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* Compatibility macros for busy handling
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* of network devices.
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*/
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static inline void netiucv_clear_busy(struct net_device *dev)
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{
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struct netiucv_priv *priv = netdev_priv(dev);
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clear_bit(0, &priv->tbusy);
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netif_wake_queue(dev);
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}
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static inline int netiucv_test_and_set_busy(struct net_device *dev)
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{
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struct netiucv_priv *priv = netdev_priv(dev);
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netif_stop_queue(dev);
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return test_and_set_bit(0, &priv->tbusy);
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}
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static u8 iucvMagic_ascii[16] = {
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0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
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0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
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};
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static u8 iucvMagic_ebcdic[16] = {
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0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
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0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
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};
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/**
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* Convert an iucv userId to its printable
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* form (strip whitespace at end).
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*
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* @param An iucv userId
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*
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* @returns The printable string (static data!!)
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*/
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static char *netiucv_printname(char *name, int len)
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{
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static char tmp[17];
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char *p = tmp;
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memcpy(tmp, name, len);
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tmp[len] = '\0';
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while (*p && ((p - tmp) < len) && (!isspace(*p)))
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p++;
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*p = '\0';
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return tmp;
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}
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static char *netiucv_printuser(struct iucv_connection *conn)
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{
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static char tmp_uid[9];
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static char tmp_udat[17];
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static char buf[100];
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if (memcmp(conn->userdata, iucvMagic_ebcdic, 16)) {
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tmp_uid[8] = '\0';
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tmp_udat[16] = '\0';
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memcpy(tmp_uid, conn->userid, 8);
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memcpy(tmp_uid, netiucv_printname(tmp_uid, 8), 8);
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memcpy(tmp_udat, conn->userdata, 16);
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EBCASC(tmp_udat, 16);
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memcpy(tmp_udat, netiucv_printname(tmp_udat, 16), 16);
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sprintf(buf, "%s.%s", tmp_uid, tmp_udat);
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return buf;
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} else
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return netiucv_printname(conn->userid, 8);
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}
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/**
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* States of the interface statemachine.
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*/
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enum dev_states {
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DEV_STATE_STOPPED,
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DEV_STATE_STARTWAIT,
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DEV_STATE_STOPWAIT,
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DEV_STATE_RUNNING,
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/**
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* MUST be always the last element!!
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*/
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NR_DEV_STATES
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};
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static const char *dev_state_names[] = {
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"Stopped",
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"StartWait",
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"StopWait",
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"Running",
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};
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/**
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* Events of the interface statemachine.
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*/
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enum dev_events {
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DEV_EVENT_START,
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DEV_EVENT_STOP,
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DEV_EVENT_CONUP,
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DEV_EVENT_CONDOWN,
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/**
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* MUST be always the last element!!
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*/
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NR_DEV_EVENTS
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};
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static const char *dev_event_names[] = {
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"Start",
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"Stop",
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"Connection up",
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"Connection down",
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};
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/**
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* Events of the connection statemachine
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*/
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enum conn_events {
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/**
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* Events, representing callbacks from
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* lowlevel iucv layer)
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*/
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CONN_EVENT_CONN_REQ,
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CONN_EVENT_CONN_ACK,
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CONN_EVENT_CONN_REJ,
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CONN_EVENT_CONN_SUS,
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CONN_EVENT_CONN_RES,
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CONN_EVENT_RX,
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CONN_EVENT_TXDONE,
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/**
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* Events, representing errors return codes from
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* calls to lowlevel iucv layer
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*/
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/**
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* Event, representing timer expiry.
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*/
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CONN_EVENT_TIMER,
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/**
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* Events, representing commands from upper levels.
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*/
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CONN_EVENT_START,
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CONN_EVENT_STOP,
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/**
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* MUST be always the last element!!
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*/
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NR_CONN_EVENTS,
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};
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static const char *conn_event_names[] = {
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"Remote connection request",
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"Remote connection acknowledge",
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"Remote connection reject",
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"Connection suspended",
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"Connection resumed",
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"Data received",
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"Data sent",
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"Timer",
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"Start",
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"Stop",
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};
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/**
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* States of the connection statemachine.
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*/
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enum conn_states {
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/**
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* Connection not assigned to any device,
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* initial state, invalid
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*/
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CONN_STATE_INVALID,
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/**
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* Userid assigned but not operating
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*/
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CONN_STATE_STOPPED,
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/**
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* Connection registered,
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* no connection request sent yet,
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* no connection request received
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*/
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CONN_STATE_STARTWAIT,
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/**
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* Connection registered and connection request sent,
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* no acknowledge and no connection request received yet.
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*/
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CONN_STATE_SETUPWAIT,
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/**
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* Connection up and running idle
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*/
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CONN_STATE_IDLE,
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/**
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* Data sent, awaiting CONN_EVENT_TXDONE
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*/
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CONN_STATE_TX,
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/**
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* Error during registration.
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*/
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CONN_STATE_REGERR,
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/**
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* Error during registration.
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*/
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CONN_STATE_CONNERR,
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/**
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* MUST be always the last element!!
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*/
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NR_CONN_STATES,
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};
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static const char *conn_state_names[] = {
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"Invalid",
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"Stopped",
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"StartWait",
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"SetupWait",
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"Idle",
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"TX",
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"Terminating",
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"Registration error",
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"Connect error",
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};
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/**
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* Debug Facility Stuff
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*/
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static debug_info_t *iucv_dbf_setup = NULL;
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|
static debug_info_t *iucv_dbf_data = NULL;
|
|
static debug_info_t *iucv_dbf_trace = NULL;
|
|
|
|
DEFINE_PER_CPU(char[256], iucv_dbf_txt_buf);
|
|
|
|
static void iucv_unregister_dbf_views(void)
|
|
{
|
|
if (iucv_dbf_setup)
|
|
debug_unregister(iucv_dbf_setup);
|
|
if (iucv_dbf_data)
|
|
debug_unregister(iucv_dbf_data);
|
|
if (iucv_dbf_trace)
|
|
debug_unregister(iucv_dbf_trace);
|
|
}
|
|
static int iucv_register_dbf_views(void)
|
|
{
|
|
iucv_dbf_setup = debug_register(IUCV_DBF_SETUP_NAME,
|
|
IUCV_DBF_SETUP_PAGES,
|
|
IUCV_DBF_SETUP_NR_AREAS,
|
|
IUCV_DBF_SETUP_LEN);
|
|
iucv_dbf_data = debug_register(IUCV_DBF_DATA_NAME,
|
|
IUCV_DBF_DATA_PAGES,
|
|
IUCV_DBF_DATA_NR_AREAS,
|
|
IUCV_DBF_DATA_LEN);
|
|
iucv_dbf_trace = debug_register(IUCV_DBF_TRACE_NAME,
|
|
IUCV_DBF_TRACE_PAGES,
|
|
IUCV_DBF_TRACE_NR_AREAS,
|
|
IUCV_DBF_TRACE_LEN);
|
|
|
|
if ((iucv_dbf_setup == NULL) || (iucv_dbf_data == NULL) ||
|
|
(iucv_dbf_trace == NULL)) {
|
|
iucv_unregister_dbf_views();
|
|
return -ENOMEM;
|
|
}
|
|
debug_register_view(iucv_dbf_setup, &debug_hex_ascii_view);
|
|
debug_set_level(iucv_dbf_setup, IUCV_DBF_SETUP_LEVEL);
|
|
|
|
debug_register_view(iucv_dbf_data, &debug_hex_ascii_view);
|
|
debug_set_level(iucv_dbf_data, IUCV_DBF_DATA_LEVEL);
|
|
|
|
debug_register_view(iucv_dbf_trace, &debug_hex_ascii_view);
|
|
debug_set_level(iucv_dbf_trace, IUCV_DBF_TRACE_LEVEL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Callback-wrappers, called from lowlevel iucv layer.
|
|
*/
|
|
|
|
static void netiucv_callback_rx(struct iucv_path *path,
|
|
struct iucv_message *msg)
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
struct iucv_event ev;
|
|
|
|
ev.conn = conn;
|
|
ev.data = msg;
|
|
fsm_event(conn->fsm, CONN_EVENT_RX, &ev);
|
|
}
|
|
|
|
static void netiucv_callback_txdone(struct iucv_path *path,
|
|
struct iucv_message *msg)
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
struct iucv_event ev;
|
|
|
|
ev.conn = conn;
|
|
ev.data = msg;
|
|
fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev);
|
|
}
|
|
|
|
static void netiucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
|
|
fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, conn);
|
|
}
|
|
|
|
static int netiucv_callback_connreq(struct iucv_path *path,
|
|
u8 ipvmid[8], u8 ipuser[16])
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
struct iucv_event ev;
|
|
static char tmp_user[9];
|
|
static char tmp_udat[17];
|
|
int rc;
|
|
|
|
rc = -EINVAL;
|
|
memcpy(tmp_user, netiucv_printname(ipvmid, 8), 8);
|
|
memcpy(tmp_udat, ipuser, 16);
|
|
EBCASC(tmp_udat, 16);
|
|
read_lock_bh(&iucv_connection_rwlock);
|
|
list_for_each_entry(conn, &iucv_connection_list, list) {
|
|
if (strncmp(ipvmid, conn->userid, 8) ||
|
|
strncmp(ipuser, conn->userdata, 16))
|
|
continue;
|
|
/* Found a matching connection for this path. */
|
|
conn->path = path;
|
|
ev.conn = conn;
|
|
ev.data = path;
|
|
fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev);
|
|
rc = 0;
|
|
}
|
|
IUCV_DBF_TEXT_(setup, 2, "Connection requested for %s.%s\n",
|
|
tmp_user, netiucv_printname(tmp_udat, 16));
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
return rc;
|
|
}
|
|
|
|
static void netiucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
|
|
fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, conn);
|
|
}
|
|
|
|
static void netiucv_callback_connsusp(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
|
|
fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, conn);
|
|
}
|
|
|
|
static void netiucv_callback_connres(struct iucv_path *path, u8 ipuser[16])
|
|
{
|
|
struct iucv_connection *conn = path->private;
|
|
|
|
fsm_event(conn->fsm, CONN_EVENT_CONN_RES, conn);
|
|
}
|
|
|
|
/**
|
|
* NOP action for statemachines
|
|
*/
|
|
static void netiucv_action_nop(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Actions of the connection statemachine
|
|
*/
|
|
|
|
/**
|
|
* netiucv_unpack_skb
|
|
* @conn: The connection where this skb has been received.
|
|
* @pskb: The received skb.
|
|
*
|
|
* Unpack a just received skb and hand it over to upper layers.
|
|
* Helper function for conn_action_rx.
|
|
*/
|
|
static void netiucv_unpack_skb(struct iucv_connection *conn,
|
|
struct sk_buff *pskb)
|
|
{
|
|
struct net_device *dev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
u16 offset = 0;
|
|
|
|
skb_put(pskb, NETIUCV_HDRLEN);
|
|
pskb->dev = dev;
|
|
pskb->ip_summed = CHECKSUM_NONE;
|
|
pskb->protocol = ntohs(ETH_P_IP);
|
|
|
|
while (1) {
|
|
struct sk_buff *skb;
|
|
struct ll_header *header = (struct ll_header *) pskb->data;
|
|
|
|
if (!header->next)
|
|
break;
|
|
|
|
skb_pull(pskb, NETIUCV_HDRLEN);
|
|
header->next -= offset;
|
|
offset += header->next;
|
|
header->next -= NETIUCV_HDRLEN;
|
|
if (skb_tailroom(pskb) < header->next) {
|
|
IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n",
|
|
header->next, skb_tailroom(pskb));
|
|
return;
|
|
}
|
|
skb_put(pskb, header->next);
|
|
skb_reset_mac_header(pskb);
|
|
skb = dev_alloc_skb(pskb->len);
|
|
if (!skb) {
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"Out of memory in netiucv_unpack_skb\n");
|
|
privptr->stats.rx_dropped++;
|
|
return;
|
|
}
|
|
skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
|
|
pskb->len);
|
|
skb_reset_mac_header(skb);
|
|
skb->dev = pskb->dev;
|
|
skb->protocol = pskb->protocol;
|
|
pskb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
privptr->stats.rx_packets++;
|
|
privptr->stats.rx_bytes += skb->len;
|
|
/*
|
|
* Since receiving is always initiated from a tasklet (in iucv.c),
|
|
* we must use netif_rx_ni() instead of netif_rx()
|
|
*/
|
|
netif_rx_ni(skb);
|
|
skb_pull(pskb, header->next);
|
|
skb_put(pskb, NETIUCV_HDRLEN);
|
|
}
|
|
}
|
|
|
|
static void conn_action_rx(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_event *ev = arg;
|
|
struct iucv_connection *conn = ev->conn;
|
|
struct iucv_message *msg = ev->data;
|
|
struct netiucv_priv *privptr = netdev_priv(conn->netdev);
|
|
int rc;
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
|
|
if (!conn->netdev) {
|
|
iucv_message_reject(conn->path, msg);
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"Received data for unlinked connection\n");
|
|
return;
|
|
}
|
|
if (msg->length > conn->max_buffsize) {
|
|
iucv_message_reject(conn->path, msg);
|
|
privptr->stats.rx_dropped++;
|
|
IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n",
|
|
msg->length, conn->max_buffsize);
|
|
return;
|
|
}
|
|
conn->rx_buff->data = conn->rx_buff->head;
|
|
skb_reset_tail_pointer(conn->rx_buff);
|
|
conn->rx_buff->len = 0;
|
|
rc = iucv_message_receive(conn->path, msg, 0, conn->rx_buff->data,
|
|
msg->length, NULL);
|
|
if (rc || msg->length < 5) {
|
|
privptr->stats.rx_errors++;
|
|
IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_receive\n", rc);
|
|
return;
|
|
}
|
|
netiucv_unpack_skb(conn, conn->rx_buff);
|
|
}
|
|
|
|
static void conn_action_txdone(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_event *ev = arg;
|
|
struct iucv_connection *conn = ev->conn;
|
|
struct iucv_message *msg = ev->data;
|
|
struct iucv_message txmsg;
|
|
struct netiucv_priv *privptr = NULL;
|
|
u32 single_flag = msg->tag;
|
|
u32 txbytes = 0;
|
|
u32 txpackets = 0;
|
|
u32 stat_maxcq = 0;
|
|
struct sk_buff *skb;
|
|
unsigned long saveflags;
|
|
struct ll_header header;
|
|
int rc;
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
|
|
if (conn && conn->netdev)
|
|
privptr = netdev_priv(conn->netdev);
|
|
conn->prof.tx_pending--;
|
|
if (single_flag) {
|
|
if ((skb = skb_dequeue(&conn->commit_queue))) {
|
|
atomic_dec(&skb->users);
|
|
if (privptr) {
|
|
privptr->stats.tx_packets++;
|
|
privptr->stats.tx_bytes +=
|
|
(skb->len - NETIUCV_HDRLEN
|
|
- NETIUCV_HDRLEN);
|
|
}
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
}
|
|
conn->tx_buff->data = conn->tx_buff->head;
|
|
skb_reset_tail_pointer(conn->tx_buff);
|
|
conn->tx_buff->len = 0;
|
|
spin_lock_irqsave(&conn->collect_lock, saveflags);
|
|
while ((skb = skb_dequeue(&conn->collect_queue))) {
|
|
header.next = conn->tx_buff->len + skb->len + NETIUCV_HDRLEN;
|
|
memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
|
|
NETIUCV_HDRLEN);
|
|
skb_copy_from_linear_data(skb,
|
|
skb_put(conn->tx_buff, skb->len),
|
|
skb->len);
|
|
txbytes += skb->len;
|
|
txpackets++;
|
|
stat_maxcq++;
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
if (conn->collect_len > conn->prof.maxmulti)
|
|
conn->prof.maxmulti = conn->collect_len;
|
|
conn->collect_len = 0;
|
|
spin_unlock_irqrestore(&conn->collect_lock, saveflags);
|
|
if (conn->tx_buff->len == 0) {
|
|
fsm_newstate(fi, CONN_STATE_IDLE);
|
|
return;
|
|
}
|
|
|
|
header.next = 0;
|
|
memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
|
|
conn->prof.send_stamp = current_kernel_time();
|
|
txmsg.class = 0;
|
|
txmsg.tag = 0;
|
|
rc = iucv_message_send(conn->path, &txmsg, 0, 0,
|
|
conn->tx_buff->data, conn->tx_buff->len);
|
|
conn->prof.doios_multi++;
|
|
conn->prof.txlen += conn->tx_buff->len;
|
|
conn->prof.tx_pending++;
|
|
if (conn->prof.tx_pending > conn->prof.tx_max_pending)
|
|
conn->prof.tx_max_pending = conn->prof.tx_pending;
|
|
if (rc) {
|
|
conn->prof.tx_pending--;
|
|
fsm_newstate(fi, CONN_STATE_IDLE);
|
|
if (privptr)
|
|
privptr->stats.tx_errors += txpackets;
|
|
IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
|
|
} else {
|
|
if (privptr) {
|
|
privptr->stats.tx_packets += txpackets;
|
|
privptr->stats.tx_bytes += txbytes;
|
|
}
|
|
if (stat_maxcq > conn->prof.maxcqueue)
|
|
conn->prof.maxcqueue = stat_maxcq;
|
|
}
|
|
}
|
|
|
|
static void conn_action_connaccept(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_event *ev = arg;
|
|
struct iucv_connection *conn = ev->conn;
|
|
struct iucv_path *path = ev->data;
|
|
struct net_device *netdev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(netdev);
|
|
int rc;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
conn->path = path;
|
|
path->msglim = NETIUCV_QUEUELEN_DEFAULT;
|
|
path->flags = 0;
|
|
rc = iucv_path_accept(path, &netiucv_handler, conn->userdata , conn);
|
|
if (rc) {
|
|
IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc);
|
|
return;
|
|
}
|
|
fsm_newstate(fi, CONN_STATE_IDLE);
|
|
netdev->tx_queue_len = conn->path->msglim;
|
|
fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
|
|
}
|
|
|
|
static void conn_action_connreject(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_event *ev = arg;
|
|
struct iucv_path *path = ev->data;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
iucv_path_sever(path, NULL);
|
|
}
|
|
|
|
static void conn_action_connack(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_connection *conn = arg;
|
|
struct net_device *netdev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(netdev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
fsm_deltimer(&conn->timer);
|
|
fsm_newstate(fi, CONN_STATE_IDLE);
|
|
netdev->tx_queue_len = conn->path->msglim;
|
|
fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
|
|
}
|
|
|
|
static void conn_action_conntimsev(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_connection *conn = arg;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
fsm_deltimer(&conn->timer);
|
|
iucv_path_sever(conn->path, conn->userdata);
|
|
fsm_newstate(fi, CONN_STATE_STARTWAIT);
|
|
}
|
|
|
|
static void conn_action_connsever(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_connection *conn = arg;
|
|
struct net_device *netdev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(netdev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
fsm_deltimer(&conn->timer);
|
|
iucv_path_sever(conn->path, conn->userdata);
|
|
dev_info(privptr->dev, "The peer z/VM guest %s has closed the "
|
|
"connection\n", netiucv_printuser(conn));
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"conn_action_connsever: Remote dropped connection\n");
|
|
fsm_newstate(fi, CONN_STATE_STARTWAIT);
|
|
fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
|
|
}
|
|
|
|
static void conn_action_start(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_connection *conn = arg;
|
|
struct net_device *netdev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(netdev);
|
|
int rc;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
fsm_newstate(fi, CONN_STATE_STARTWAIT);
|
|
|
|
/*
|
|
* We must set the state before calling iucv_connect because the
|
|
* callback handler could be called at any point after the connection
|
|
* request is sent
|
|
*/
|
|
|
|
fsm_newstate(fi, CONN_STATE_SETUPWAIT);
|
|
conn->path = iucv_path_alloc(NETIUCV_QUEUELEN_DEFAULT, 0, GFP_KERNEL);
|
|
IUCV_DBF_TEXT_(setup, 2, "%s: connecting to %s ...\n",
|
|
netdev->name, netiucv_printuser(conn));
|
|
|
|
rc = iucv_path_connect(conn->path, &netiucv_handler, conn->userid,
|
|
NULL, conn->userdata, conn);
|
|
switch (rc) {
|
|
case 0:
|
|
netdev->tx_queue_len = conn->path->msglim;
|
|
fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC,
|
|
CONN_EVENT_TIMER, conn);
|
|
return;
|
|
case 11:
|
|
dev_warn(privptr->dev,
|
|
"The IUCV device failed to connect to z/VM guest %s\n",
|
|
netiucv_printname(conn->userid, 8));
|
|
fsm_newstate(fi, CONN_STATE_STARTWAIT);
|
|
break;
|
|
case 12:
|
|
dev_warn(privptr->dev,
|
|
"The IUCV device failed to connect to the peer on z/VM"
|
|
" guest %s\n", netiucv_printname(conn->userid, 8));
|
|
fsm_newstate(fi, CONN_STATE_STARTWAIT);
|
|
break;
|
|
case 13:
|
|
dev_err(privptr->dev,
|
|
"Connecting the IUCV device would exceed the maximum"
|
|
" number of IUCV connections\n");
|
|
fsm_newstate(fi, CONN_STATE_CONNERR);
|
|
break;
|
|
case 14:
|
|
dev_err(privptr->dev,
|
|
"z/VM guest %s has too many IUCV connections"
|
|
" to connect with the IUCV device\n",
|
|
netiucv_printname(conn->userid, 8));
|
|
fsm_newstate(fi, CONN_STATE_CONNERR);
|
|
break;
|
|
case 15:
|
|
dev_err(privptr->dev,
|
|
"The IUCV device cannot connect to a z/VM guest with no"
|
|
" IUCV authorization\n");
|
|
fsm_newstate(fi, CONN_STATE_CONNERR);
|
|
break;
|
|
default:
|
|
dev_err(privptr->dev,
|
|
"Connecting the IUCV device failed with error %d\n",
|
|
rc);
|
|
fsm_newstate(fi, CONN_STATE_CONNERR);
|
|
break;
|
|
}
|
|
IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc);
|
|
kfree(conn->path);
|
|
conn->path = NULL;
|
|
}
|
|
|
|
static void netiucv_purge_skb_queue(struct sk_buff_head *q)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(q))) {
|
|
atomic_dec(&skb->users);
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
}
|
|
|
|
static void conn_action_stop(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_event *ev = arg;
|
|
struct iucv_connection *conn = ev->conn;
|
|
struct net_device *netdev = conn->netdev;
|
|
struct netiucv_priv *privptr = netdev_priv(netdev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
fsm_deltimer(&conn->timer);
|
|
fsm_newstate(fi, CONN_STATE_STOPPED);
|
|
netiucv_purge_skb_queue(&conn->collect_queue);
|
|
if (conn->path) {
|
|
IUCV_DBF_TEXT(trace, 5, "calling iucv_path_sever\n");
|
|
iucv_path_sever(conn->path, conn->userdata);
|
|
kfree(conn->path);
|
|
conn->path = NULL;
|
|
}
|
|
netiucv_purge_skb_queue(&conn->commit_queue);
|
|
fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
|
|
}
|
|
|
|
static void conn_action_inval(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct iucv_connection *conn = arg;
|
|
struct net_device *netdev = conn->netdev;
|
|
|
|
IUCV_DBF_TEXT_(data, 2, "%s('%s'): conn_action_inval called\n",
|
|
netdev->name, conn->userid);
|
|
}
|
|
|
|
static const fsm_node conn_fsm[] = {
|
|
{ CONN_STATE_INVALID, CONN_EVENT_START, conn_action_inval },
|
|
{ CONN_STATE_STOPPED, CONN_EVENT_START, conn_action_start },
|
|
|
|
{ CONN_STATE_STOPPED, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_STARTWAIT, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_SETUPWAIT, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_IDLE, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_TX, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_REGERR, CONN_EVENT_STOP, conn_action_stop },
|
|
{ CONN_STATE_CONNERR, CONN_EVENT_STOP, conn_action_stop },
|
|
|
|
{ CONN_STATE_STOPPED, CONN_EVENT_CONN_REQ, conn_action_connreject },
|
|
{ CONN_STATE_STARTWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
|
|
{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
|
|
{ CONN_STATE_IDLE, CONN_EVENT_CONN_REQ, conn_action_connreject },
|
|
{ CONN_STATE_TX, CONN_EVENT_CONN_REQ, conn_action_connreject },
|
|
|
|
{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_ACK, conn_action_connack },
|
|
{ CONN_STATE_SETUPWAIT, CONN_EVENT_TIMER, conn_action_conntimsev },
|
|
|
|
{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REJ, conn_action_connsever },
|
|
{ CONN_STATE_IDLE, CONN_EVENT_CONN_REJ, conn_action_connsever },
|
|
{ CONN_STATE_TX, CONN_EVENT_CONN_REJ, conn_action_connsever },
|
|
|
|
{ CONN_STATE_IDLE, CONN_EVENT_RX, conn_action_rx },
|
|
{ CONN_STATE_TX, CONN_EVENT_RX, conn_action_rx },
|
|
|
|
{ CONN_STATE_TX, CONN_EVENT_TXDONE, conn_action_txdone },
|
|
{ CONN_STATE_IDLE, CONN_EVENT_TXDONE, conn_action_txdone },
|
|
};
|
|
|
|
static const int CONN_FSM_LEN = sizeof(conn_fsm) / sizeof(fsm_node);
|
|
|
|
|
|
/*
|
|
* Actions for interface - statemachine.
|
|
*/
|
|
|
|
/**
|
|
* dev_action_start
|
|
* @fi: An instance of an interface statemachine.
|
|
* @event: The event, just happened.
|
|
* @arg: Generic pointer, casted from struct net_device * upon call.
|
|
*
|
|
* Startup connection by sending CONN_EVENT_START to it.
|
|
*/
|
|
static void dev_action_start(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT);
|
|
fsm_event(privptr->conn->fsm, CONN_EVENT_START, privptr->conn);
|
|
}
|
|
|
|
/**
|
|
* Shutdown connection by sending CONN_EVENT_STOP to it.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_stop(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
struct iucv_event ev;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
ev.conn = privptr->conn;
|
|
|
|
fsm_newstate(fi, DEV_STATE_STOPWAIT);
|
|
fsm_event(privptr->conn->fsm, CONN_EVENT_STOP, &ev);
|
|
}
|
|
|
|
/**
|
|
* Called from connection statemachine
|
|
* when a connection is up and running.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_connup(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
struct net_device *dev = arg;
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
switch (fsm_getstate(fi)) {
|
|
case DEV_STATE_STARTWAIT:
|
|
fsm_newstate(fi, DEV_STATE_RUNNING);
|
|
dev_info(privptr->dev,
|
|
"The IUCV device has been connected"
|
|
" successfully to %s\n",
|
|
netiucv_printuser(privptr->conn));
|
|
IUCV_DBF_TEXT(setup, 3,
|
|
"connection is up and running\n");
|
|
break;
|
|
case DEV_STATE_STOPWAIT:
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"dev_action_connup: in DEV_STATE_STOPWAIT\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called from connection statemachine
|
|
* when a connection has been shutdown.
|
|
*
|
|
* @param fi An instance of an interface statemachine.
|
|
* @param event The event, just happened.
|
|
* @param arg Generic pointer, casted from struct net_device * upon call.
|
|
*/
|
|
static void
|
|
dev_action_conndown(fsm_instance *fi, int event, void *arg)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
switch (fsm_getstate(fi)) {
|
|
case DEV_STATE_RUNNING:
|
|
fsm_newstate(fi, DEV_STATE_STARTWAIT);
|
|
break;
|
|
case DEV_STATE_STOPWAIT:
|
|
fsm_newstate(fi, DEV_STATE_STOPPED);
|
|
IUCV_DBF_TEXT(setup, 3, "connection is down\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static const fsm_node dev_fsm[] = {
|
|
{ DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
|
|
|
|
{ DEV_STATE_STOPWAIT, DEV_EVENT_START, dev_action_start },
|
|
{ DEV_STATE_STOPWAIT, DEV_EVENT_CONDOWN, dev_action_conndown },
|
|
|
|
{ DEV_STATE_STARTWAIT, DEV_EVENT_STOP, dev_action_stop },
|
|
{ DEV_STATE_STARTWAIT, DEV_EVENT_CONUP, dev_action_connup },
|
|
|
|
{ DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
|
|
{ DEV_STATE_RUNNING, DEV_EVENT_CONDOWN, dev_action_conndown },
|
|
{ DEV_STATE_RUNNING, DEV_EVENT_CONUP, netiucv_action_nop },
|
|
};
|
|
|
|
static const int DEV_FSM_LEN = sizeof(dev_fsm) / sizeof(fsm_node);
|
|
|
|
/**
|
|
* Transmit a packet.
|
|
* This is a helper function for netiucv_tx().
|
|
*
|
|
* @param conn Connection to be used for sending.
|
|
* @param skb Pointer to struct sk_buff of packet to send.
|
|
* The linklevel header has already been set up
|
|
* by netiucv_tx().
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int netiucv_transmit_skb(struct iucv_connection *conn,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct iucv_message msg;
|
|
unsigned long saveflags;
|
|
struct ll_header header;
|
|
int rc;
|
|
|
|
if (fsm_getstate(conn->fsm) != CONN_STATE_IDLE) {
|
|
int l = skb->len + NETIUCV_HDRLEN;
|
|
|
|
spin_lock_irqsave(&conn->collect_lock, saveflags);
|
|
if (conn->collect_len + l >
|
|
(conn->max_buffsize - NETIUCV_HDRLEN)) {
|
|
rc = -EBUSY;
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"EBUSY from netiucv_transmit_skb\n");
|
|
} else {
|
|
atomic_inc(&skb->users);
|
|
skb_queue_tail(&conn->collect_queue, skb);
|
|
conn->collect_len += l;
|
|
rc = 0;
|
|
}
|
|
spin_unlock_irqrestore(&conn->collect_lock, saveflags);
|
|
} else {
|
|
struct sk_buff *nskb = skb;
|
|
/**
|
|
* Copy the skb to a new allocated skb in lowmem only if the
|
|
* data is located above 2G in memory or tailroom is < 2.
|
|
*/
|
|
unsigned long hi = ((unsigned long)(skb_tail_pointer(skb) +
|
|
NETIUCV_HDRLEN)) >> 31;
|
|
int copied = 0;
|
|
if (hi || (skb_tailroom(skb) < 2)) {
|
|
nskb = alloc_skb(skb->len + NETIUCV_HDRLEN +
|
|
NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA);
|
|
if (!nskb) {
|
|
IUCV_DBF_TEXT(data, 2, "alloc_skb failed\n");
|
|
rc = -ENOMEM;
|
|
return rc;
|
|
} else {
|
|
skb_reserve(nskb, NETIUCV_HDRLEN);
|
|
memcpy(skb_put(nskb, skb->len),
|
|
skb->data, skb->len);
|
|
}
|
|
copied = 1;
|
|
}
|
|
/**
|
|
* skb now is below 2G and has enough room. Add headers.
|
|
*/
|
|
header.next = nskb->len + NETIUCV_HDRLEN;
|
|
memcpy(skb_push(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
|
|
header.next = 0;
|
|
memcpy(skb_put(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
|
|
|
|
fsm_newstate(conn->fsm, CONN_STATE_TX);
|
|
conn->prof.send_stamp = current_kernel_time();
|
|
|
|
msg.tag = 1;
|
|
msg.class = 0;
|
|
rc = iucv_message_send(conn->path, &msg, 0, 0,
|
|
nskb->data, nskb->len);
|
|
conn->prof.doios_single++;
|
|
conn->prof.txlen += skb->len;
|
|
conn->prof.tx_pending++;
|
|
if (conn->prof.tx_pending > conn->prof.tx_max_pending)
|
|
conn->prof.tx_max_pending = conn->prof.tx_pending;
|
|
if (rc) {
|
|
struct netiucv_priv *privptr;
|
|
fsm_newstate(conn->fsm, CONN_STATE_IDLE);
|
|
conn->prof.tx_pending--;
|
|
privptr = netdev_priv(conn->netdev);
|
|
if (privptr)
|
|
privptr->stats.tx_errors++;
|
|
if (copied)
|
|
dev_kfree_skb(nskb);
|
|
else {
|
|
/**
|
|
* Remove our headers. They get added
|
|
* again on retransmit.
|
|
*/
|
|
skb_pull(skb, NETIUCV_HDRLEN);
|
|
skb_trim(skb, skb->len - NETIUCV_HDRLEN);
|
|
}
|
|
IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
|
|
} else {
|
|
if (copied)
|
|
dev_kfree_skb(skb);
|
|
atomic_inc(&nskb->users);
|
|
skb_queue_tail(&conn->commit_queue, nskb);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Interface API for upper network layers
|
|
*/
|
|
|
|
/**
|
|
* Open an interface.
|
|
* Called from generic network layer when ifconfig up is run.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int netiucv_open(struct net_device *dev)
|
|
{
|
|
struct netiucv_priv *priv = netdev_priv(dev);
|
|
|
|
fsm_event(priv->fsm, DEV_EVENT_START, dev);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Close an interface.
|
|
* Called from generic network layer when ifconfig down is run.
|
|
*
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 on success, -ERRNO on failure. (Never fails.)
|
|
*/
|
|
static int netiucv_close(struct net_device *dev)
|
|
{
|
|
struct netiucv_priv *priv = netdev_priv(dev);
|
|
|
|
fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
|
|
return 0;
|
|
}
|
|
|
|
static int netiucv_pm_prepare(struct device *dev)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
return 0;
|
|
}
|
|
|
|
static void netiucv_pm_complete(struct device *dev)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* netiucv_pm_freeze() - Freeze PM callback
|
|
* @dev: netiucv device
|
|
*
|
|
* close open netiucv interfaces
|
|
*/
|
|
static int netiucv_pm_freeze(struct device *dev)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
struct net_device *ndev = NULL;
|
|
int rc = 0;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
if (priv && priv->conn)
|
|
ndev = priv->conn->netdev;
|
|
if (!ndev)
|
|
goto out;
|
|
netif_device_detach(ndev);
|
|
priv->pm_state = fsm_getstate(priv->fsm);
|
|
rc = netiucv_close(ndev);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* netiucv_pm_restore_thaw() - Thaw and restore PM callback
|
|
* @dev: netiucv device
|
|
*
|
|
* re-open netiucv interfaces closed during freeze
|
|
*/
|
|
static int netiucv_pm_restore_thaw(struct device *dev)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
struct net_device *ndev = NULL;
|
|
int rc = 0;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
if (priv && priv->conn)
|
|
ndev = priv->conn->netdev;
|
|
if (!ndev)
|
|
goto out;
|
|
switch (priv->pm_state) {
|
|
case DEV_STATE_RUNNING:
|
|
case DEV_STATE_STARTWAIT:
|
|
rc = netiucv_open(ndev);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
netif_device_attach(ndev);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* Start transmission of a packet.
|
|
* Called from generic network device layer.
|
|
*
|
|
* @param skb Pointer to buffer containing the packet.
|
|
* @param dev Pointer to interface struct.
|
|
*
|
|
* @return 0 if packet consumed, !0 if packet rejected.
|
|
* Note: If we return !0, then the packet is free'd by
|
|
* the generic network layer.
|
|
*/
|
|
static int netiucv_tx(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
int rc;
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
/**
|
|
* Some sanity checks ...
|
|
*/
|
|
if (skb == NULL) {
|
|
IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n");
|
|
privptr->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
if (skb_headroom(skb) < NETIUCV_HDRLEN) {
|
|
IUCV_DBF_TEXT(data, 2,
|
|
"netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n");
|
|
dev_kfree_skb(skb);
|
|
privptr->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/**
|
|
* If connection is not running, try to restart it
|
|
* and throw away packet.
|
|
*/
|
|
if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
|
|
dev_kfree_skb(skb);
|
|
privptr->stats.tx_dropped++;
|
|
privptr->stats.tx_errors++;
|
|
privptr->stats.tx_carrier_errors++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
if (netiucv_test_and_set_busy(dev)) {
|
|
IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n");
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
dev->trans_start = jiffies;
|
|
rc = netiucv_transmit_skb(privptr->conn, skb);
|
|
netiucv_clear_busy(dev);
|
|
return rc ? NETDEV_TX_BUSY : NETDEV_TX_OK;
|
|
}
|
|
|
|
/**
|
|
* netiucv_stats
|
|
* @dev: Pointer to interface struct.
|
|
*
|
|
* Returns interface statistics of a device.
|
|
*
|
|
* Returns pointer to stats struct of this interface.
|
|
*/
|
|
static struct net_device_stats *netiucv_stats (struct net_device * dev)
|
|
{
|
|
struct netiucv_priv *priv = netdev_priv(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return &priv->stats;
|
|
}
|
|
|
|
/**
|
|
* netiucv_change_mtu
|
|
* @dev: Pointer to interface struct.
|
|
* @new_mtu: The new MTU to use for this interface.
|
|
*
|
|
* Sets MTU of an interface.
|
|
*
|
|
* Returns 0 on success, -EINVAL if MTU is out of valid range.
|
|
* (valid range is 576 .. NETIUCV_MTU_MAX).
|
|
*/
|
|
static int netiucv_change_mtu(struct net_device * dev, int new_mtu)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
if (new_mtu < 576 || new_mtu > NETIUCV_MTU_MAX) {
|
|
IUCV_DBF_TEXT(setup, 2, "given MTU out of valid range\n");
|
|
return -EINVAL;
|
|
}
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* attributes in sysfs
|
|
*/
|
|
|
|
static ssize_t user_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%s\n", netiucv_printuser(priv->conn));
|
|
}
|
|
|
|
static int netiucv_check_user(const char *buf, size_t count, char *username,
|
|
char *userdata)
|
|
{
|
|
const char *p;
|
|
int i;
|
|
|
|
p = strchr(buf, '.');
|
|
if ((p && ((count > 26) ||
|
|
((p - buf) > 8) ||
|
|
(buf + count - p > 18))) ||
|
|
(!p && (count > 9))) {
|
|
IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0, p = buf; i < 8 && *p && *p != '.'; i++, p++) {
|
|
if (isalnum(*p) || *p == '$') {
|
|
username[i] = toupper(*p);
|
|
continue;
|
|
}
|
|
if (*p == '\n')
|
|
/* trailing lf, grr */
|
|
break;
|
|
IUCV_DBF_TEXT_(setup, 2,
|
|
"conn_write: invalid character %02x\n", *p);
|
|
return -EINVAL;
|
|
}
|
|
while (i < 8)
|
|
username[i++] = ' ';
|
|
username[8] = '\0';
|
|
|
|
if (*p == '.') {
|
|
p++;
|
|
for (i = 0; i < 16 && *p; i++, p++) {
|
|
if (*p == '\n')
|
|
break;
|
|
userdata[i] = toupper(*p);
|
|
}
|
|
while (i > 0 && i < 16)
|
|
userdata[i++] = ' ';
|
|
} else
|
|
memcpy(userdata, iucvMagic_ascii, 16);
|
|
userdata[16] = '\0';
|
|
ASCEBC(userdata, 16);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t user_write(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
struct net_device *ndev = priv->conn->netdev;
|
|
char username[9];
|
|
char userdata[17];
|
|
int rc;
|
|
struct iucv_connection *cp;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
rc = netiucv_check_user(buf, count, username, userdata);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (memcmp(username, priv->conn->userid, 9) &&
|
|
(ndev->flags & (IFF_UP | IFF_RUNNING))) {
|
|
/* username changed while the interface is active. */
|
|
IUCV_DBF_TEXT(setup, 2, "user_write: device active\n");
|
|
return -EPERM;
|
|
}
|
|
read_lock_bh(&iucv_connection_rwlock);
|
|
list_for_each_entry(cp, &iucv_connection_list, list) {
|
|
if (!strncmp(username, cp->userid, 9) &&
|
|
!strncmp(userdata, cp->userdata, 17) && cp->netdev != ndev) {
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
IUCV_DBF_TEXT_(setup, 2, "user_write: Connection to %s "
|
|
"already exists\n", netiucv_printuser(cp));
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
memcpy(priv->conn->userid, username, 9);
|
|
memcpy(priv->conn->userdata, userdata, 17);
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(user, 0644, user_show, user_write);
|
|
|
|
static ssize_t buffer_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%d\n", priv->conn->max_buffsize);
|
|
}
|
|
|
|
static ssize_t buffer_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
struct net_device *ndev = priv->conn->netdev;
|
|
char *e;
|
|
int bs1;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
if (count >= 39)
|
|
return -EINVAL;
|
|
|
|
bs1 = simple_strtoul(buf, &e, 0);
|
|
|
|
if (e && (!isspace(*e))) {
|
|
IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %02x\n",
|
|
*e);
|
|
return -EINVAL;
|
|
}
|
|
if (bs1 > NETIUCV_BUFSIZE_MAX) {
|
|
IUCV_DBF_TEXT_(setup, 2,
|
|
"buffer_write: buffer size %d too large\n",
|
|
bs1);
|
|
return -EINVAL;
|
|
}
|
|
if ((ndev->flags & IFF_RUNNING) &&
|
|
(bs1 < (ndev->mtu + NETIUCV_HDRLEN + 2))) {
|
|
IUCV_DBF_TEXT_(setup, 2,
|
|
"buffer_write: buffer size %d too small\n",
|
|
bs1);
|
|
return -EINVAL;
|
|
}
|
|
if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) {
|
|
IUCV_DBF_TEXT_(setup, 2,
|
|
"buffer_write: buffer size %d too small\n",
|
|
bs1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
priv->conn->max_buffsize = bs1;
|
|
if (!(ndev->flags & IFF_RUNNING))
|
|
ndev->mtu = bs1 - NETIUCV_HDRLEN - NETIUCV_HDRLEN;
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
|
|
|
|
static ssize_t dev_fsm_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%s\n", fsm_getstate_str(priv->fsm));
|
|
}
|
|
|
|
static DEVICE_ATTR(device_fsm_state, 0444, dev_fsm_show, NULL);
|
|
|
|
static ssize_t conn_fsm_show (struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%s\n", fsm_getstate_str(priv->conn->fsm));
|
|
}
|
|
|
|
static DEVICE_ATTR(connection_fsm_state, 0444, conn_fsm_show, NULL);
|
|
|
|
static ssize_t maxmulti_show (struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.maxmulti);
|
|
}
|
|
|
|
static ssize_t maxmulti_write (struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.maxmulti = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(max_tx_buffer_used, 0644, maxmulti_show, maxmulti_write);
|
|
|
|
static ssize_t maxcq_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.maxcqueue);
|
|
}
|
|
|
|
static ssize_t maxcq_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.maxcqueue = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(max_chained_skbs, 0644, maxcq_show, maxcq_write);
|
|
|
|
static ssize_t sdoio_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.doios_single);
|
|
}
|
|
|
|
static ssize_t sdoio_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.doios_single = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(tx_single_write_ops, 0644, sdoio_show, sdoio_write);
|
|
|
|
static ssize_t mdoio_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.doios_multi);
|
|
}
|
|
|
|
static ssize_t mdoio_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
priv->conn->prof.doios_multi = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(tx_multi_write_ops, 0644, mdoio_show, mdoio_write);
|
|
|
|
static ssize_t txlen_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.txlen);
|
|
}
|
|
|
|
static ssize_t txlen_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.txlen = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(netto_bytes, 0644, txlen_show, txlen_write);
|
|
|
|
static ssize_t txtime_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.tx_time);
|
|
}
|
|
|
|
static ssize_t txtime_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.tx_time = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(max_tx_io_time, 0644, txtime_show, txtime_write);
|
|
|
|
static ssize_t txpend_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.tx_pending);
|
|
}
|
|
|
|
static ssize_t txpend_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.tx_pending = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(tx_pending, 0644, txpend_show, txpend_write);
|
|
|
|
static ssize_t txmpnd_show (struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 5, __func__);
|
|
return sprintf(buf, "%ld\n", priv->conn->prof.tx_max_pending);
|
|
}
|
|
|
|
static ssize_t txmpnd_write (struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct netiucv_priv *priv = dev_get_drvdata(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 4, __func__);
|
|
priv->conn->prof.tx_max_pending = 0;
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(tx_max_pending, 0644, txmpnd_show, txmpnd_write);
|
|
|
|
static struct attribute *netiucv_attrs[] = {
|
|
&dev_attr_buffer.attr,
|
|
&dev_attr_user.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group netiucv_attr_group = {
|
|
.attrs = netiucv_attrs,
|
|
};
|
|
|
|
static struct attribute *netiucv_stat_attrs[] = {
|
|
&dev_attr_device_fsm_state.attr,
|
|
&dev_attr_connection_fsm_state.attr,
|
|
&dev_attr_max_tx_buffer_used.attr,
|
|
&dev_attr_max_chained_skbs.attr,
|
|
&dev_attr_tx_single_write_ops.attr,
|
|
&dev_attr_tx_multi_write_ops.attr,
|
|
&dev_attr_netto_bytes.attr,
|
|
&dev_attr_max_tx_io_time.attr,
|
|
&dev_attr_tx_pending.attr,
|
|
&dev_attr_tx_max_pending.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group netiucv_stat_attr_group = {
|
|
.name = "stats",
|
|
.attrs = netiucv_stat_attrs,
|
|
};
|
|
|
|
static int netiucv_add_files(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
ret = sysfs_create_group(&dev->kobj, &netiucv_attr_group);
|
|
if (ret)
|
|
return ret;
|
|
ret = sysfs_create_group(&dev->kobj, &netiucv_stat_attr_group);
|
|
if (ret)
|
|
sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
|
|
return ret;
|
|
}
|
|
|
|
static void netiucv_remove_files(struct device *dev)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
sysfs_remove_group(&dev->kobj, &netiucv_stat_attr_group);
|
|
sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
|
|
}
|
|
|
|
static int netiucv_register_device(struct net_device *ndev)
|
|
{
|
|
struct netiucv_priv *priv = netdev_priv(ndev);
|
|
struct device *dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
int ret;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
if (dev) {
|
|
dev_set_name(dev, "net%s", ndev->name);
|
|
dev->bus = &iucv_bus;
|
|
dev->parent = iucv_root;
|
|
/*
|
|
* The release function could be called after the
|
|
* module has been unloaded. It's _only_ task is to
|
|
* free the struct. Therefore, we specify kfree()
|
|
* directly here. (Probably a little bit obfuscating
|
|
* but legitime ...).
|
|
*/
|
|
dev->release = (void (*)(struct device *))kfree;
|
|
dev->driver = &netiucv_driver;
|
|
} else
|
|
return -ENOMEM;
|
|
|
|
ret = device_register(dev);
|
|
if (ret) {
|
|
put_device(dev);
|
|
return ret;
|
|
}
|
|
ret = netiucv_add_files(dev);
|
|
if (ret)
|
|
goto out_unreg;
|
|
priv->dev = dev;
|
|
dev_set_drvdata(dev, priv);
|
|
return 0;
|
|
|
|
out_unreg:
|
|
device_unregister(dev);
|
|
return ret;
|
|
}
|
|
|
|
static void netiucv_unregister_device(struct device *dev)
|
|
{
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
netiucv_remove_files(dev);
|
|
device_unregister(dev);
|
|
}
|
|
|
|
/**
|
|
* Allocate and initialize a new connection structure.
|
|
* Add it to the list of netiucv connections;
|
|
*/
|
|
static struct iucv_connection *netiucv_new_connection(struct net_device *dev,
|
|
char *username,
|
|
char *userdata)
|
|
{
|
|
struct iucv_connection *conn;
|
|
|
|
conn = kzalloc(sizeof(*conn), GFP_KERNEL);
|
|
if (!conn)
|
|
goto out;
|
|
skb_queue_head_init(&conn->collect_queue);
|
|
skb_queue_head_init(&conn->commit_queue);
|
|
spin_lock_init(&conn->collect_lock);
|
|
conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;
|
|
conn->netdev = dev;
|
|
|
|
conn->rx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
|
|
if (!conn->rx_buff)
|
|
goto out_conn;
|
|
conn->tx_buff = alloc_skb(conn->max_buffsize, GFP_KERNEL | GFP_DMA);
|
|
if (!conn->tx_buff)
|
|
goto out_rx;
|
|
conn->fsm = init_fsm("netiucvconn", conn_state_names,
|
|
conn_event_names, NR_CONN_STATES,
|
|
NR_CONN_EVENTS, conn_fsm, CONN_FSM_LEN,
|
|
GFP_KERNEL);
|
|
if (!conn->fsm)
|
|
goto out_tx;
|
|
|
|
fsm_settimer(conn->fsm, &conn->timer);
|
|
fsm_newstate(conn->fsm, CONN_STATE_INVALID);
|
|
|
|
if (userdata)
|
|
memcpy(conn->userdata, userdata, 17);
|
|
if (username) {
|
|
memcpy(conn->userid, username, 9);
|
|
fsm_newstate(conn->fsm, CONN_STATE_STOPPED);
|
|
}
|
|
|
|
write_lock_bh(&iucv_connection_rwlock);
|
|
list_add_tail(&conn->list, &iucv_connection_list);
|
|
write_unlock_bh(&iucv_connection_rwlock);
|
|
return conn;
|
|
|
|
out_tx:
|
|
kfree_skb(conn->tx_buff);
|
|
out_rx:
|
|
kfree_skb(conn->rx_buff);
|
|
out_conn:
|
|
kfree(conn);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* Release a connection structure and remove it from the
|
|
* list of netiucv connections.
|
|
*/
|
|
static void netiucv_remove_connection(struct iucv_connection *conn)
|
|
{
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
write_lock_bh(&iucv_connection_rwlock);
|
|
list_del_init(&conn->list);
|
|
write_unlock_bh(&iucv_connection_rwlock);
|
|
fsm_deltimer(&conn->timer);
|
|
netiucv_purge_skb_queue(&conn->collect_queue);
|
|
if (conn->path) {
|
|
iucv_path_sever(conn->path, conn->userdata);
|
|
kfree(conn->path);
|
|
conn->path = NULL;
|
|
}
|
|
netiucv_purge_skb_queue(&conn->commit_queue);
|
|
kfree_fsm(conn->fsm);
|
|
kfree_skb(conn->rx_buff);
|
|
kfree_skb(conn->tx_buff);
|
|
}
|
|
|
|
/**
|
|
* Release everything of a net device.
|
|
*/
|
|
static void netiucv_free_netdevice(struct net_device *dev)
|
|
{
|
|
struct netiucv_priv *privptr = netdev_priv(dev);
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
if (!dev)
|
|
return;
|
|
|
|
if (privptr) {
|
|
if (privptr->conn)
|
|
netiucv_remove_connection(privptr->conn);
|
|
if (privptr->fsm)
|
|
kfree_fsm(privptr->fsm);
|
|
privptr->conn = NULL; privptr->fsm = NULL;
|
|
/* privptr gets freed by free_netdev() */
|
|
}
|
|
free_netdev(dev);
|
|
}
|
|
|
|
/**
|
|
* Initialize a net device. (Called from kernel in alloc_netdev())
|
|
*/
|
|
static const struct net_device_ops netiucv_netdev_ops = {
|
|
.ndo_open = netiucv_open,
|
|
.ndo_stop = netiucv_close,
|
|
.ndo_get_stats = netiucv_stats,
|
|
.ndo_start_xmit = netiucv_tx,
|
|
.ndo_change_mtu = netiucv_change_mtu,
|
|
};
|
|
|
|
static void netiucv_setup_netdevice(struct net_device *dev)
|
|
{
|
|
dev->mtu = NETIUCV_MTU_DEFAULT;
|
|
dev->destructor = netiucv_free_netdevice;
|
|
dev->hard_header_len = NETIUCV_HDRLEN;
|
|
dev->addr_len = 0;
|
|
dev->type = ARPHRD_SLIP;
|
|
dev->tx_queue_len = NETIUCV_QUEUELEN_DEFAULT;
|
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
|
|
dev->netdev_ops = &netiucv_netdev_ops;
|
|
}
|
|
|
|
/**
|
|
* Allocate and initialize everything of a net device.
|
|
*/
|
|
static struct net_device *netiucv_init_netdevice(char *username, char *userdata)
|
|
{
|
|
struct netiucv_priv *privptr;
|
|
struct net_device *dev;
|
|
|
|
dev = alloc_netdev(sizeof(struct netiucv_priv), "iucv%d",
|
|
netiucv_setup_netdevice);
|
|
if (!dev)
|
|
return NULL;
|
|
if (dev_alloc_name(dev, dev->name) < 0)
|
|
goto out_netdev;
|
|
|
|
privptr = netdev_priv(dev);
|
|
privptr->fsm = init_fsm("netiucvdev", dev_state_names,
|
|
dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS,
|
|
dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
|
|
if (!privptr->fsm)
|
|
goto out_netdev;
|
|
|
|
privptr->conn = netiucv_new_connection(dev, username, userdata);
|
|
if (!privptr->conn) {
|
|
IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n");
|
|
goto out_fsm;
|
|
}
|
|
fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
|
|
return dev;
|
|
|
|
out_fsm:
|
|
kfree_fsm(privptr->fsm);
|
|
out_netdev:
|
|
free_netdev(dev);
|
|
return NULL;
|
|
}
|
|
|
|
static ssize_t conn_write(struct device_driver *drv,
|
|
const char *buf, size_t count)
|
|
{
|
|
char username[9];
|
|
char userdata[17];
|
|
int rc;
|
|
struct net_device *dev;
|
|
struct netiucv_priv *priv;
|
|
struct iucv_connection *cp;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
rc = netiucv_check_user(buf, count, username, userdata);
|
|
if (rc)
|
|
return rc;
|
|
|
|
read_lock_bh(&iucv_connection_rwlock);
|
|
list_for_each_entry(cp, &iucv_connection_list, list) {
|
|
if (!strncmp(username, cp->userid, 9) &&
|
|
!strncmp(userdata, cp->userdata, 17)) {
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
IUCV_DBF_TEXT_(setup, 2, "conn_write: Connection to %s "
|
|
"already exists\n", netiucv_printuser(cp));
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
|
|
dev = netiucv_init_netdevice(username, userdata);
|
|
if (!dev) {
|
|
IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
rc = netiucv_register_device(dev);
|
|
if (rc) {
|
|
IUCV_DBF_TEXT_(setup, 2,
|
|
"ret %d from netiucv_register_device\n", rc);
|
|
goto out_free_ndev;
|
|
}
|
|
|
|
/* sysfs magic */
|
|
priv = netdev_priv(dev);
|
|
SET_NETDEV_DEV(dev, priv->dev);
|
|
|
|
rc = register_netdev(dev);
|
|
if (rc)
|
|
goto out_unreg;
|
|
|
|
dev_info(priv->dev, "The IUCV interface to %s has been established "
|
|
"successfully\n",
|
|
netiucv_printuser(priv->conn));
|
|
|
|
return count;
|
|
|
|
out_unreg:
|
|
netiucv_unregister_device(priv->dev);
|
|
out_free_ndev:
|
|
netiucv_free_netdevice(dev);
|
|
return rc;
|
|
}
|
|
|
|
static DRIVER_ATTR(connection, 0200, NULL, conn_write);
|
|
|
|
static ssize_t remove_write (struct device_driver *drv,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct iucv_connection *cp;
|
|
struct net_device *ndev;
|
|
struct netiucv_priv *priv;
|
|
struct device *dev;
|
|
char name[IFNAMSIZ];
|
|
const char *p;
|
|
int i;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
|
|
if (count >= IFNAMSIZ)
|
|
count = IFNAMSIZ - 1;
|
|
|
|
for (i = 0, p = buf; i < count && *p; i++, p++) {
|
|
if (*p == '\n' || *p == ' ')
|
|
/* trailing lf, grr */
|
|
break;
|
|
name[i] = *p;
|
|
}
|
|
name[i] = '\0';
|
|
|
|
read_lock_bh(&iucv_connection_rwlock);
|
|
list_for_each_entry(cp, &iucv_connection_list, list) {
|
|
ndev = cp->netdev;
|
|
priv = netdev_priv(ndev);
|
|
dev = priv->dev;
|
|
if (strncmp(name, ndev->name, count))
|
|
continue;
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
|
|
dev_warn(dev, "The IUCV device is connected"
|
|
" to %s and cannot be removed\n",
|
|
priv->conn->userid);
|
|
IUCV_DBF_TEXT(data, 2, "remove_write: still active\n");
|
|
return -EPERM;
|
|
}
|
|
unregister_netdev(ndev);
|
|
netiucv_unregister_device(dev);
|
|
return count;
|
|
}
|
|
read_unlock_bh(&iucv_connection_rwlock);
|
|
IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
static DRIVER_ATTR(remove, 0200, NULL, remove_write);
|
|
|
|
static struct attribute * netiucv_drv_attrs[] = {
|
|
&driver_attr_connection.attr,
|
|
&driver_attr_remove.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group netiucv_drv_attr_group = {
|
|
.attrs = netiucv_drv_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *netiucv_drv_attr_groups[] = {
|
|
&netiucv_drv_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static void netiucv_banner(void)
|
|
{
|
|
pr_info("driver initialized\n");
|
|
}
|
|
|
|
static void __exit netiucv_exit(void)
|
|
{
|
|
struct iucv_connection *cp;
|
|
struct net_device *ndev;
|
|
struct netiucv_priv *priv;
|
|
struct device *dev;
|
|
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
while (!list_empty(&iucv_connection_list)) {
|
|
cp = list_entry(iucv_connection_list.next,
|
|
struct iucv_connection, list);
|
|
ndev = cp->netdev;
|
|
priv = netdev_priv(ndev);
|
|
dev = priv->dev;
|
|
|
|
unregister_netdev(ndev);
|
|
netiucv_unregister_device(dev);
|
|
}
|
|
|
|
device_unregister(netiucv_dev);
|
|
driver_unregister(&netiucv_driver);
|
|
iucv_unregister(&netiucv_handler, 1);
|
|
iucv_unregister_dbf_views();
|
|
|
|
pr_info("driver unloaded\n");
|
|
return;
|
|
}
|
|
|
|
static int __init netiucv_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = iucv_register_dbf_views();
|
|
if (rc)
|
|
goto out;
|
|
rc = iucv_register(&netiucv_handler, 1);
|
|
if (rc)
|
|
goto out_dbf;
|
|
IUCV_DBF_TEXT(trace, 3, __func__);
|
|
netiucv_driver.groups = netiucv_drv_attr_groups;
|
|
rc = driver_register(&netiucv_driver);
|
|
if (rc) {
|
|
IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", rc);
|
|
goto out_iucv;
|
|
}
|
|
/* establish dummy device */
|
|
netiucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
|
|
if (!netiucv_dev) {
|
|
rc = -ENOMEM;
|
|
goto out_driver;
|
|
}
|
|
dev_set_name(netiucv_dev, "netiucv");
|
|
netiucv_dev->bus = &iucv_bus;
|
|
netiucv_dev->parent = iucv_root;
|
|
netiucv_dev->release = (void (*)(struct device *))kfree;
|
|
netiucv_dev->driver = &netiucv_driver;
|
|
rc = device_register(netiucv_dev);
|
|
if (rc) {
|
|
put_device(netiucv_dev);
|
|
goto out_driver;
|
|
}
|
|
netiucv_banner();
|
|
return rc;
|
|
|
|
out_driver:
|
|
driver_unregister(&netiucv_driver);
|
|
out_iucv:
|
|
iucv_unregister(&netiucv_handler, 1);
|
|
out_dbf:
|
|
iucv_unregister_dbf_views();
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
module_init(netiucv_init);
|
|
module_exit(netiucv_exit);
|
|
MODULE_LICENSE("GPL");
|