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kernel-ark/drivers/s390/net/netiucv.c
Michael Holzheu 66a464dbc8 [PATCH] s390: debug feature changes 
This patch changes the memory allocation method for the s390 debug feature.
Trace buffers had been allocated using the get_free_pages() function before.
Therefore it was not possible to get big memory areas in a running system due
to memory fragmentation.  Now the trace buffers are subdivided into several
subbuffers with pagesize.  Therefore it is now possible to allocate more
memory for the trace buffers and more trace records can be written.

In addition to that, dynamic specification of the size of the trace buffers is
implemented.  It is now possible to change the size of a trace buffer using a
new debugfs file instance.  When writing a number into this file, the trace
buffer size is changed to 'number * pagesize'.

In the past all the traces could be obtained from userspace by accessing files
in the "proc" filesystem.  Now with debugfs we have a new filesystem which
should be used for debugging purposes.  This patch moves the debug feature
from procfs to debugfs.

Since the interface of debug_register() changed, all device drivers, which use
the debug feature had to be adjusted.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-25 16:24:37 -07:00

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/*
* $Id: netiucv.c,v 1.66 2005/05/11 08:10:17 holzheu Exp $
*
* IUCV network driver
*
* Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
*
* Driverfs integration and all bugs therein by Cornelia Huck(cohuck@de.ibm.com)
*
* Documentation used:
* the source of the original IUCV driver by:
* Stefan Hegewald <hegewald@de.ibm.com>
* Hartmut Penner <hpenner@de.ibm.com>
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
* Alan Altmark (Alan_Altmark@us.ibm.com) Sept. 2000
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* RELEASE-TAG: IUCV network driver $Revision: 1.66 $
*
*/
#undef DEBUG
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/ip.h>
#include <linux/if_arp.h>
#include <linux/tcp.h>
#include <linux/skbuff.h>
#include <linux/ctype.h>
#include <net/dst.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include "iucv.h"
#include "fsm.h"
MODULE_AUTHOR
("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)");
MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver");
#define PRINTK_HEADER " iucv: " /* for debugging */
static struct device_driver netiucv_driver = {
.name = "netiucv",
.bus = &iucv_bus,
};
/**
* Per connection profiling data
*/
struct connection_profile {
unsigned long maxmulti;
unsigned long maxcqueue;
unsigned long doios_single;
unsigned long doios_multi;
unsigned long txlen;
unsigned long tx_time;
struct timespec send_stamp;
unsigned long tx_pending;
unsigned long tx_max_pending;
};
/**
* Representation of one iucv connection
*/
struct iucv_connection {
struct iucv_connection *next;
iucv_handle_t handle;
__u16 pathid;
struct sk_buff *rx_buff;
struct sk_buff *tx_buff;
struct sk_buff_head collect_queue;
struct sk_buff_head commit_queue;
spinlock_t collect_lock;
int collect_len;
int max_buffsize;
fsm_timer timer;
fsm_instance *fsm;
struct net_device *netdev;
struct connection_profile prof;
char userid[9];
};
/**
* Linked list of all connection structs.
*/
static struct iucv_connection *iucv_connections;
/**
* Representation of event-data for the
* connection state machine.
*/
struct iucv_event {
struct iucv_connection *conn;
void *data;
};
/**
* Private part of the network device structure
*/
struct netiucv_priv {
struct net_device_stats stats;
unsigned long tbusy;
fsm_instance *fsm;
struct iucv_connection *conn;
struct device *dev;
};
/**
* Link level header for a packet.
*/
typedef struct ll_header_t {
__u16 next;
} ll_header;
#define NETIUCV_HDRLEN (sizeof(ll_header))
#define NETIUCV_BUFSIZE_MAX 32768
#define NETIUCV_BUFSIZE_DEFAULT NETIUCV_BUFSIZE_MAX
#define NETIUCV_MTU_MAX (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN)
#define NETIUCV_MTU_DEFAULT 9216
#define NETIUCV_QUEUELEN_DEFAULT 50
#define NETIUCV_TIMEOUT_5SEC 5000
/**
* Compatibility macros for busy handling
* of network devices.
*/
static __inline__ void netiucv_clear_busy(struct net_device *dev)
{
clear_bit(0, &(((struct netiucv_priv *)dev->priv)->tbusy));
netif_wake_queue(dev);
}
static __inline__ int netiucv_test_and_set_busy(struct net_device *dev)
{
netif_stop_queue(dev);
return test_and_set_bit(0, &((struct netiucv_priv *)dev->priv)->tbusy);
}
static __u8 iucv_host[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
static __u8 iucvMagic[16] = {
0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
};
/**
* This mask means the 16-byte IUCV "magic" and the origin userid must
* match exactly as specified in order to give connection_pending()
* control.
*/
static __u8 netiucv_mask[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
/**
* Convert an iucv userId to its printable
* form (strip whitespace at end).
*
* @param An iucv userId
*
* @returns The printable string (static data!!)
*/
static __inline__ char *
netiucv_printname(char *name)
{
static char tmp[9];
char *p = tmp;
memcpy(tmp, name, 8);
tmp[8] = '\0';
while (*p && (!isspace(*p)))
p++;
*p = '\0';
return tmp;
}
/**
* States of the interface statemachine.
*/
enum dev_states {
DEV_STATE_STOPPED,
DEV_STATE_STARTWAIT,
DEV_STATE_STOPWAIT,
DEV_STATE_RUNNING,
/**
* MUST be always the last element!!
*/
NR_DEV_STATES
};
static const char *dev_state_names[] = {
"Stopped",
"StartWait",
"StopWait",
"Running",
};
/**
* Events of the interface statemachine.
*/
enum dev_events {
DEV_EVENT_START,
DEV_EVENT_STOP,
DEV_EVENT_CONUP,
DEV_EVENT_CONDOWN,
/**
* MUST be always the last element!!
*/
NR_DEV_EVENTS
};
static const char *dev_event_names[] = {
"Start",
"Stop",
"Connection up",
"Connection down",
};
/**
* Events of the connection statemachine
*/
enum conn_events {
/**
* Events, representing callbacks from
* lowlevel iucv layer)
*/
CONN_EVENT_CONN_REQ,
CONN_EVENT_CONN_ACK,
CONN_EVENT_CONN_REJ,
CONN_EVENT_CONN_SUS,
CONN_EVENT_CONN_RES,
CONN_EVENT_RX,
CONN_EVENT_TXDONE,
/**
* Events, representing errors return codes from
* calls to lowlevel iucv layer
*/
/**
* Event, representing timer expiry.
*/
CONN_EVENT_TIMER,
/**
* Events, representing commands from upper levels.
*/
CONN_EVENT_START,
CONN_EVENT_STOP,
/**
* MUST be always the last element!!
*/
NR_CONN_EVENTS,
};
static const char *conn_event_names[] = {
"Remote connection request",
"Remote connection acknowledge",
"Remote connection reject",
"Connection suspended",
"Connection resumed",
"Data received",
"Data sent",
"Timer",
"Start",
"Stop",
};
/**
* States of the connection statemachine.
*/
enum conn_states {
/**
* Connection not assigned to any device,
* initial state, invalid
*/
CONN_STATE_INVALID,
/**
* Userid assigned but not operating
*/
CONN_STATE_STOPPED,
/**
* Connection registered,
* no connection request sent yet,
* no connection request received
*/
CONN_STATE_STARTWAIT,
/**
* Connection registered and connection request sent,
* no acknowledge and no connection request received yet.
*/
CONN_STATE_SETUPWAIT,
/**
* Connection up and running idle
*/
CONN_STATE_IDLE,
/**
* Data sent, awaiting CONN_EVENT_TXDONE
*/
CONN_STATE_TX,
/**
* Error during registration.
*/
CONN_STATE_REGERR,
/**
* Error during registration.
*/
CONN_STATE_CONNERR,
/**
* MUST be always the last element!!
*/
NR_CONN_STATES,
};
static const char *conn_state_names[] = {
"Invalid",
"Stopped",
"StartWait",
"SetupWait",
"Idle",
"TX",
"Terminating",
"Registration error",
"Connect error",
};
/**
* Debug Facility Stuff
*/
static debug_info_t *iucv_dbf_setup = NULL;
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(iucv_MessagePending *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_RX, &ev);
}
static void
netiucv_callback_txdone(iucv_MessageComplete *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev);
}
static void
netiucv_callback_connack(iucv_ConnectionComplete *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, &ev);
}
static void
netiucv_callback_connreq(iucv_ConnectionPending *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev);
}
static void
netiucv_callback_connrej(iucv_ConnectionSevered *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, &ev);
}
static void
netiucv_callback_connsusp(iucv_ConnectionQuiesced *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, &ev);
}
static void
netiucv_callback_connres(iucv_ConnectionResumed *eib, void *pgm_data)
{
struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
struct iucv_event ev;
ev.conn = conn;
ev.data = (void *)eib;
fsm_event(conn->fsm, CONN_EVENT_CONN_RES, &ev);
}
static iucv_interrupt_ops_t netiucv_ops = {
.ConnectionPending = netiucv_callback_connreq,
.ConnectionComplete = netiucv_callback_connack,
.ConnectionSevered = netiucv_callback_connrej,
.ConnectionQuiesced = netiucv_callback_connsusp,
.ConnectionResumed = netiucv_callback_connres,
.MessagePending = netiucv_callback_rx,
.MessageComplete = netiucv_callback_txdone
};
/**
* Dummy NOP action for all statemachines
*/
static void
fsm_action_nop(fsm_instance *fi, int event, void *arg)
{
}
/**
* Actions of the connection statemachine
*****************************************************************************/
/**
* Helper function for conn_action_rx()
* Unpack a just received skb and hand it over to
* upper layers.
*
* @param conn The connection where this skb has been received.
* @param pskb The received skb.
*/
//static __inline__ void
static void
netiucv_unpack_skb(struct iucv_connection *conn, struct sk_buff *pskb)
{
struct net_device *dev = conn->netdev;
struct netiucv_priv *privptr = dev->priv;
__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;
ll_header *header = (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) {
PRINT_WARN("%s: Illegal next field in iucv header: "
"%d > %d\n",
dev->name, header->next, skb_tailroom(pskb));
IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n",
header->next, skb_tailroom(pskb));
return;
}
skb_put(pskb, header->next);
pskb->mac.raw = pskb->data;
skb = dev_alloc_skb(pskb->len);
if (!skb) {
PRINT_WARN("%s Out of memory in netiucv_unpack_skb\n",
dev->name);
IUCV_DBF_TEXT(data, 2,
"Out of memory in netiucv_unpack_skb\n");
privptr->stats.rx_dropped++;
return;
}
memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len);
skb->mac.raw = skb->data;
skb->dev = pskb->dev;
skb->protocol = pskb->protocol;
pskb->ip_summed = CHECKSUM_UNNECESSARY;
/*
* 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);
dev->last_rx = jiffies;
privptr->stats.rx_packets++;
privptr->stats.rx_bytes += skb->len;
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 = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
iucv_MessagePending *eib = (iucv_MessagePending *)ev->data;
struct netiucv_priv *privptr =(struct netiucv_priv *)conn->netdev->priv;
__u32 msglen = eib->ln1msg2.ipbfln1f;
int rc;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
if (!conn->netdev) {
/* FRITZ: How to tell iucv LL to drop the msg? */
PRINT_WARN("Received data for unlinked connection\n");
IUCV_DBF_TEXT(data, 2,
"Received data for unlinked connection\n");
return;
}
if (msglen > conn->max_buffsize) {
/* FRITZ: How to tell iucv LL to drop the msg? */
privptr->stats.rx_dropped++;
PRINT_WARN("msglen %d > max_buffsize %d\n",
msglen, conn->max_buffsize);
IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n",
msglen, conn->max_buffsize);
return;
}
conn->rx_buff->data = conn->rx_buff->tail = conn->rx_buff->head;
conn->rx_buff->len = 0;
rc = iucv_receive(conn->pathid, eib->ipmsgid, eib->iptrgcls,
conn->rx_buff->data, msglen, NULL, NULL, NULL);
if (rc || msglen < 5) {
privptr->stats.rx_errors++;
PRINT_WARN("iucv_receive returned %08x\n", rc);
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 = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
iucv_MessageComplete *eib = (iucv_MessageComplete *)ev->data;
struct netiucv_priv *privptr = NULL;
/* Shut up, gcc! skb is always below 2G. */
__u32 single_flag = eib->ipmsgtag;
__u32 txbytes = 0;
__u32 txpackets = 0;
__u32 stat_maxcq = 0;
struct sk_buff *skb;
unsigned long saveflags;
ll_header header;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
if (conn && conn->netdev && conn->netdev->priv)
privptr = (struct netiucv_priv *)conn->netdev->priv;
conn->prof.tx_pending--;
if (single_flag) {
if ((skb = skb_dequeue(&conn->commit_queue))) {
atomic_dec(&skb->users);
dev_kfree_skb_any(skb);
if (privptr) {
privptr->stats.tx_packets++;
privptr->stats.tx_bytes +=
(skb->len - NETIUCV_HDRLEN
- NETIUCV_HDRLEN);
}
}
}
conn->tx_buff->data = conn->tx_buff->tail = conn->tx_buff->head;
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);
memcpy(skb_put(conn->tx_buff, skb->len), skb->data, 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) {
int rc;
header.next = 0;
memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
NETIUCV_HDRLEN);
conn->prof.send_stamp = xtime;
rc = iucv_send(conn->pathid, NULL, 0, 0, 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;
PRINT_WARN("iucv_send returned %08x\n", rc);
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;
}
} else
fsm_newstate(fi, CONN_STATE_IDLE);
}
static void
conn_action_connaccept(fsm_instance *fi, int event, void *arg)
{
struct iucv_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
iucv_ConnectionPending *eib = (iucv_ConnectionPending *)ev->data;
struct net_device *netdev = conn->netdev;
struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
int rc;
__u16 msglimit;
__u8 udata[16];
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
rc = iucv_accept(eib->ippathid, NETIUCV_QUEUELEN_DEFAULT, udata, 0,
conn->handle, conn, NULL, &msglimit);
if (rc) {
PRINT_WARN("%s: IUCV accept failed with error %d\n",
netdev->name, rc);
IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc);
return;
}
fsm_newstate(fi, CONN_STATE_IDLE);
conn->pathid = eib->ippathid;
netdev->tx_queue_len = msglimit;
fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
}
static void
conn_action_connreject(fsm_instance *fi, int event, void *arg)
{
struct iucv_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
struct net_device *netdev = conn->netdev;
iucv_ConnectionPending *eib = (iucv_ConnectionPending *)ev->data;
__u8 udata[16];
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
iucv_sever(eib->ippathid, udata);
if (eib->ippathid != conn->pathid) {
PRINT_INFO("%s: IR Connection Pending; "
"pathid %d does not match original pathid %d\n",
netdev->name, eib->ippathid, conn->pathid);
IUCV_DBF_TEXT_(data, 2,
"connreject: IR pathid %d, conn. pathid %d\n",
eib->ippathid, conn->pathid);
iucv_sever(conn->pathid, udata);
}
}
static void
conn_action_connack(fsm_instance *fi, int event, void *arg)
{
struct iucv_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
iucv_ConnectionComplete *eib = (iucv_ConnectionComplete *)ev->data;
struct net_device *netdev = conn->netdev;
struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
fsm_deltimer(&conn->timer);
fsm_newstate(fi, CONN_STATE_IDLE);
if (eib->ippathid != conn->pathid) {
PRINT_INFO("%s: IR Connection Complete; "
"pathid %d does not match original pathid %d\n",
netdev->name, eib->ippathid, conn->pathid);
IUCV_DBF_TEXT_(data, 2,
"connack: IR pathid %d, conn. pathid %d\n",
eib->ippathid, conn->pathid);
conn->pathid = eib->ippathid;
}
netdev->tx_queue_len = eib->ipmsglim;
fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
}
static void
conn_action_conntimsev(fsm_instance *fi, int event, void *arg)
{
struct iucv_connection *conn = (struct iucv_connection *)arg;
__u8 udata[16];
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
fsm_deltimer(&conn->timer);
iucv_sever(conn->pathid, udata);
fsm_newstate(fi, CONN_STATE_STARTWAIT);
}
static void
conn_action_connsever(fsm_instance *fi, int event, void *arg)
{
struct iucv_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
struct net_device *netdev = conn->netdev;
struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
__u8 udata[16];
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
fsm_deltimer(&conn->timer);
iucv_sever(conn->pathid, udata);
PRINT_INFO("%s: Remote dropped connection\n", netdev->name);
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_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
__u16 msglimit;
int rc;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (!conn->handle) {
IUCV_DBF_TEXT(trace, 5, "calling iucv_register_program\n");
conn->handle =
iucv_register_program(iucvMagic, conn->userid,
netiucv_mask,
&netiucv_ops, conn);
fsm_newstate(fi, CONN_STATE_STARTWAIT);
if (!conn->handle) {
fsm_newstate(fi, CONN_STATE_REGERR);
conn->handle = NULL;
IUCV_DBF_TEXT(setup, 2,
"NULL from iucv_register_program\n");
return;
}
PRINT_DEBUG("%s('%s'): registered successfully\n",
conn->netdev->name, conn->userid);
}
PRINT_DEBUG("%s('%s'): connecting ...\n",
conn->netdev->name, conn->userid);
/* 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);
rc = iucv_connect(&(conn->pathid), NETIUCV_QUEUELEN_DEFAULT, iucvMagic,
conn->userid, iucv_host, 0, NULL, &msglimit,
conn->handle, conn);
switch (rc) {
case 0:
conn->netdev->tx_queue_len = msglimit;
fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC,
CONN_EVENT_TIMER, conn);
return;
case 11:
PRINT_INFO("%s: User %s is currently not available.\n",
conn->netdev->name,
netiucv_printname(conn->userid));
fsm_newstate(fi, CONN_STATE_STARTWAIT);
return;
case 12:
PRINT_INFO("%s: User %s is currently not ready.\n",
conn->netdev->name,
netiucv_printname(conn->userid));
fsm_newstate(fi, CONN_STATE_STARTWAIT);
return;
case 13:
PRINT_WARN("%s: Too many IUCV connections.\n",
conn->netdev->name);
fsm_newstate(fi, CONN_STATE_CONNERR);
break;
case 14:
PRINT_WARN(
"%s: User %s has too many IUCV connections.\n",
conn->netdev->name,
netiucv_printname(conn->userid));
fsm_newstate(fi, CONN_STATE_CONNERR);
break;
case 15:
PRINT_WARN(
"%s: No IUCV authorization in CP directory.\n",
conn->netdev->name);
fsm_newstate(fi, CONN_STATE_CONNERR);
break;
default:
PRINT_WARN("%s: iucv_connect returned error %d\n",
conn->netdev->name, rc);
fsm_newstate(fi, CONN_STATE_CONNERR);
break;
}
IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc);
IUCV_DBF_TEXT(trace, 5, "calling iucv_unregister_program\n");
iucv_unregister_program(conn->handle);
conn->handle = 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 = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
struct net_device *netdev = conn->netdev;
struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
fsm_deltimer(&conn->timer);
fsm_newstate(fi, CONN_STATE_STOPPED);
netiucv_purge_skb_queue(&conn->collect_queue);
if (conn->handle)
IUCV_DBF_TEXT(trace, 5, "calling iucv_unregister_program\n");
iucv_unregister_program(conn->handle);
conn->handle = 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_event *ev = (struct iucv_event *)arg;
struct iucv_connection *conn = ev->conn;
struct net_device *netdev = conn->netdev;
PRINT_WARN("%s: Cannot connect without username\n",
netdev->name);
IUCV_DBF_TEXT(data, 2, "conn_action_inval called\n");
}
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.
*****************************************************************************/
/**
* Startup connection by sending CONN_EVENT_START 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_start(fsm_instance *fi, int event, void *arg)
{
struct net_device *dev = (struct net_device *)arg;
struct netiucv_priv *privptr = dev->priv;
struct iucv_event ev;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
ev.conn = privptr->conn;
fsm_newstate(fi, DEV_STATE_STARTWAIT);
fsm_event(privptr->conn->fsm, CONN_EVENT_START, &ev);
}
/**
* 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 = (struct net_device *)arg;
struct netiucv_priv *privptr = dev->priv;
struct iucv_event ev;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
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 = (struct net_device *)arg;
struct netiucv_priv *privptr = dev->priv;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
switch (fsm_getstate(fi)) {
case DEV_STATE_STARTWAIT:
fsm_newstate(fi, DEV_STATE_RUNNING);
PRINT_INFO("%s: connected with remote side %s\n",
dev->name, privptr->conn->userid);
IUCV_DBF_TEXT(setup, 3,
"connection is up and running\n");
break;
case DEV_STATE_STOPWAIT:
PRINT_INFO(
"%s: got connection UP event during shutdown!\n",
dev->name);
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, __FUNCTION__);
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, fsm_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) {
unsigned long saveflags;
ll_header header;
int rc = 0;
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;
}
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 + 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) {
PRINT_WARN("%s: Could not allocate tx_skb\n",
conn->netdev->name);
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 = xtime;
rc = iucv_send(conn->pathid, NULL, 0, 0, 1 /* single_flag */,
0, nskb->data, nskb->len);
/* Shut up, gcc! nskb is always below 2G. */
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 = (struct netiucv_priv *)conn->netdev->priv;
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);
}
PRINT_WARN("iucv_send returned %08x\n", rc);
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) {
fsm_event(((struct netiucv_priv *)dev->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) {
fsm_event(((struct netiucv_priv *)dev->priv)->fsm, DEV_EVENT_STOP, dev);
return 0;
}
/**
* 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)
{
int rc = 0;
struct netiucv_priv *privptr = dev->priv;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
/**
* Some sanity checks ...
*/
if (skb == NULL) {
PRINT_WARN("%s: NULL sk_buff passed\n", dev->name);
IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n");
privptr->stats.tx_dropped++;
return 0;
}
if (skb_headroom(skb) < NETIUCV_HDRLEN) {
PRINT_WARN("%s: Got sk_buff with head room < %ld bytes\n",
dev->name, NETIUCV_HDRLEN);
IUCV_DBF_TEXT(data, 2,
"netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n");
dev_kfree_skb(skb);
privptr->stats.tx_dropped++;
return 0;
}
/**
* If connection is not running, try to restart it
* and throw away packet.
*/
if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
fsm_event(privptr->fsm, DEV_EVENT_START, dev);
dev_kfree_skb(skb);
privptr->stats.tx_dropped++;
privptr->stats.tx_errors++;
privptr->stats.tx_carrier_errors++;
return 0;
}
if (netiucv_test_and_set_busy(dev)) {
IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n");
return -EBUSY;
}
dev->trans_start = jiffies;
if (netiucv_transmit_skb(privptr->conn, skb))
rc = 1;
netiucv_clear_busy(dev);
return rc;
}
/**
* Returns interface statistics of a device.
*
* @param dev Pointer to interface struct.
*
* @return Pointer to stats struct of this interface.
*/
static struct net_device_stats *
netiucv_stats (struct net_device * dev)
{
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
return &((struct netiucv_priv *)dev->priv)->stats;
}
/**
* Sets MTU of an interface.
*
* @param dev Pointer to interface struct.
* @param new_mtu The new MTU to use for this interface.
*
* @return 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, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
return sprintf(buf, "%s\n", netiucv_printname(priv->conn->userid));
}
static ssize_t
user_write (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct netiucv_priv *priv = dev->driver_data;
struct net_device *ndev = priv->conn->netdev;
char *p;
char *tmp;
char username[10];
int i;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (count>9) {
PRINT_WARN("netiucv: username too long (%d)!\n", (int)count);
IUCV_DBF_TEXT_(setup, 2,
"%d is length of username\n", (int)count);
return -EINVAL;
}
tmp = strsep((char **) &buf, "\n");
for (i=0, p=tmp; i<8 && *p; i++, p++) {
if (isalnum(*p) || (*p == '$'))
username[i]= *p;
else if (*p == '\n') {
/* trailing lf, grr */
break;
} else {
PRINT_WARN("netiucv: Invalid char %c in username!\n",
*p);
IUCV_DBF_TEXT_(setup, 2,
"username: invalid character %c\n",
*p);
return -EINVAL;
}
}
while (i<9)
username[i++] = ' ';
username[9] = '\0';
if (memcmp(username, priv->conn->userid, 8)) {
/* username changed */
if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
PRINT_WARN(
"netiucv: device %s active, connected to %s\n",
dev->bus_id, priv->conn->userid);
PRINT_WARN("netiucv: user cannot be updated\n");
IUCV_DBF_TEXT(setup, 2, "user_write: device active\n");
return -EBUSY;
}
}
memcpy(priv->conn->userid, username, 9);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
struct net_device *ndev = priv->conn->netdev;
char *e;
int bs1;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (count >= 39)
return -EINVAL;
bs1 = simple_strtoul(buf, &e, 0);
if (e && (!isspace(*e))) {
PRINT_WARN("netiucv: Invalid character in buffer!\n");
IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %c\n", *e);
return -EINVAL;
}
if (bs1 > NETIUCV_BUFSIZE_MAX) {
PRINT_WARN("netiucv: Given buffer size %d too large.\n",
bs1);
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))) {
PRINT_WARN("netiucv: Given buffer size %d too small.\n",
bs1);
IUCV_DBF_TEXT_(setup, 2,
"buffer_write: buffer size %d too small\n",
bs1);
return -EINVAL;
}
if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) {
PRINT_WARN("netiucv: Given buffer size %d too small.\n",
bs1);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
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->driver_data;
IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
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 inline int
netiucv_add_files(struct device *dev)
{
int ret;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
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 inline void
netiucv_remove_files(struct device *dev)
{
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
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 = ndev->priv;
struct device *dev = kmalloc(sizeof(struct device), GFP_KERNEL);
int ret;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (dev) {
memset(dev, 0, sizeof(struct device));
snprintf(dev->bus_id, BUS_ID_SIZE, "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)
return ret;
ret = netiucv_add_files(dev);
if (ret)
goto out_unreg;
priv->dev = dev;
dev->driver_data = priv;
return 0;
out_unreg:
device_unregister(dev);
return ret;
}
static void
netiucv_unregister_device(struct device *dev)
{
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
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)
{
struct iucv_connection **clist = &iucv_connections;
struct iucv_connection *conn =
(struct iucv_connection *)
kmalloc(sizeof(struct iucv_connection), GFP_KERNEL);
if (conn) {
memset(conn, 0, sizeof(struct iucv_connection));
skb_queue_head_init(&conn->collect_queue);
skb_queue_head_init(&conn->commit_queue);
conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;
conn->netdev = dev;
conn->rx_buff = alloc_skb(NETIUCV_BUFSIZE_DEFAULT,
GFP_KERNEL | GFP_DMA);
if (!conn->rx_buff) {
kfree(conn);
return NULL;
}
conn->tx_buff = alloc_skb(NETIUCV_BUFSIZE_DEFAULT,
GFP_KERNEL | GFP_DMA);
if (!conn->tx_buff) {
kfree_skb(conn->rx_buff);
kfree(conn);
return NULL;
}
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) {
kfree_skb(conn->tx_buff);
kfree_skb(conn->rx_buff);
kfree(conn);
return NULL;
}
fsm_settimer(conn->fsm, &conn->timer);
fsm_newstate(conn->fsm, CONN_STATE_INVALID);
if (username) {
memcpy(conn->userid, username, 9);
fsm_newstate(conn->fsm, CONN_STATE_STOPPED);
}
conn->next = *clist;
*clist = conn;
}
return conn;
}
/**
* Release a connection structure and remove it from the
* list of netiucv connections.
*/
static void
netiucv_remove_connection(struct iucv_connection *conn)
{
struct iucv_connection **clist = &iucv_connections;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (conn == NULL)
return;
while (*clist) {
if (*clist == conn) {
*clist = conn->next;
if (conn->handle) {
iucv_unregister_program(conn->handle);
conn->handle = NULL;
}
fsm_deltimer(&conn->timer);
kfree_fsm(conn->fsm);
kfree_skb(conn->rx_buff);
kfree_skb(conn->tx_buff);
return;
}
clist = &((*clist)->next);
}
}
/**
* Release everything of a net device.
*/
static void
netiucv_free_netdevice(struct net_device *dev)
{
struct netiucv_priv *privptr;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (!dev)
return;
privptr = (struct netiucv_priv *)dev->priv;
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 void
netiucv_setup_netdevice(struct net_device *dev)
{
memset(dev->priv, 0, sizeof(struct netiucv_priv));
dev->mtu = NETIUCV_MTU_DEFAULT;
dev->hard_start_xmit = netiucv_tx;
dev->open = netiucv_open;
dev->stop = netiucv_close;
dev->get_stats = netiucv_stats;
dev->change_mtu = netiucv_change_mtu;
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;
SET_MODULE_OWNER(dev);
}
/**
* Allocate and initialize everything of a net device.
*/
static struct net_device *
netiucv_init_netdevice(char *username)
{
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) {
free_netdev(dev);
return NULL;
}
privptr = (struct netiucv_priv *)dev->priv;
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) {
free_netdev(dev);
return NULL;
}
privptr->conn = netiucv_new_connection(dev, username);
if (!privptr->conn) {
kfree_fsm(privptr->fsm);
free_netdev(dev);
IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n");
return NULL;
}
fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
return dev;
}
static ssize_t
conn_write(struct device_driver *drv, const char *buf, size_t count)
{
char *p;
char username[10];
int i, ret;
struct net_device *dev;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (count>9) {
PRINT_WARN("netiucv: username too long (%d)!\n", (int)count);
IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n");
return -EINVAL;
}
for (i=0, p=(char *)buf; i<8 && *p; i++, p++) {
if (isalnum(*p) || (*p == '$'))
username[i]= *p;
else if (*p == '\n') {
/* trailing lf, grr */
break;
} else {
PRINT_WARN("netiucv: Invalid character in username!\n");
IUCV_DBF_TEXT_(setup, 2,
"conn_write: invalid character %c\n", *p);
return -EINVAL;
}
}
while (i<9)
username[i++] = ' ';
username[9] = '\0';
dev = netiucv_init_netdevice(username);
if (!dev) {
PRINT_WARN(
"netiucv: Could not allocate network device structure "
"for user '%s'\n", netiucv_printname(username));
IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n");
return -ENODEV;
}
if ((ret = netiucv_register_device(dev))) {
IUCV_DBF_TEXT_(setup, 2,
"ret %d from netiucv_register_device\n", ret);
goto out_free_ndev;
}
/* sysfs magic */
SET_NETDEV_DEV(dev,
(struct device*)((struct netiucv_priv*)dev->priv)->dev);
if ((ret = register_netdev(dev))) {
netiucv_unregister_device((struct device*)
((struct netiucv_priv*)dev->priv)->dev);
goto out_free_ndev;
}
PRINT_INFO("%s: '%s'\n", dev->name, netiucv_printname(username));
return count;
out_free_ndev:
PRINT_WARN("netiucv: Could not register '%s'\n", dev->name);
IUCV_DBF_TEXT(setup, 2, "conn_write: could not register\n");
netiucv_free_netdevice(dev);
return ret;
}
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 **clist = &iucv_connections;
struct net_device *ndev;
struct netiucv_priv *priv;
struct device *dev;
char name[IFNAMSIZ];
char *p;
int i;
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
if (count >= IFNAMSIZ)
count = IFNAMSIZ-1;
for (i=0, p=(char *)buf; i<count && *p; i++, p++) {
if ((*p == '\n') | (*p == ' ')) {
/* trailing lf, grr */
break;
} else {
name[i]=*p;
}
}
name[i] = '\0';
while (*clist) {
ndev = (*clist)->netdev;
priv = (struct netiucv_priv*)ndev->priv;
dev = priv->dev;
if (strncmp(name, ndev->name, count)) {
clist = &((*clist)->next);
continue;
}
if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
PRINT_WARN(
"netiucv: net device %s active with peer %s\n",
ndev->name, priv->conn->userid);
PRINT_WARN("netiucv: %s cannot be removed\n",
ndev->name);
IUCV_DBF_TEXT(data, 2, "remove_write: still active\n");
return -EBUSY;
}
unregister_netdev(ndev);
netiucv_unregister_device(dev);
return count;
}
PRINT_WARN("netiucv: net device %s unknown\n", name);
IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");
return -EINVAL;
}
DRIVER_ATTR(remove, 0200, NULL, remove_write);
static void
netiucv_banner(void)
{
char vbuf[] = "$Revision: 1.66 $";
char *version = vbuf;
if ((version = strchr(version, ':'))) {
char *p = strchr(version + 1, '$');
if (p)
*p = '\0';
} else
version = " ??? ";
PRINT_INFO("NETIUCV driver Version%s initialized\n", version);
}
static void __exit
netiucv_exit(void)
{
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
while (iucv_connections) {
struct net_device *ndev = iucv_connections->netdev;
struct netiucv_priv *priv = (struct netiucv_priv*)ndev->priv;
struct device *dev = priv->dev;
unregister_netdev(ndev);
netiucv_unregister_device(dev);
}
driver_remove_file(&netiucv_driver, &driver_attr_connection);
driver_remove_file(&netiucv_driver, &driver_attr_remove);
driver_unregister(&netiucv_driver);
iucv_unregister_dbf_views();
PRINT_INFO("NETIUCV driver unloaded\n");
return;
}
static int __init
netiucv_init(void)
{
int ret;
ret = iucv_register_dbf_views();
if (ret) {
PRINT_WARN("netiucv_init failed, "
"iucv_register_dbf_views rc = %d\n", ret);
return ret;
}
IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
ret = driver_register(&netiucv_driver);
if (ret) {
PRINT_ERR("NETIUCV: failed to register driver.\n");
IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", ret);
iucv_unregister_dbf_views();
return ret;
}
/* Add entry for specifying connections. */
ret = driver_create_file(&netiucv_driver, &driver_attr_connection);
if (!ret) {
ret = driver_create_file(&netiucv_driver, &driver_attr_remove);
netiucv_banner();
} else {
PRINT_ERR("NETIUCV: failed to add driver attribute.\n");
IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_create_file\n", ret);
driver_unregister(&netiucv_driver);
iucv_unregister_dbf_views();
}
return ret;
}
module_init(netiucv_init);
module_exit(netiucv_exit);
MODULE_LICENSE("GPL");
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