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kernel_samsung_a34x-permissive/drivers/s390/net/netiucv.c

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Import A346BXXU1AWB9 kernel source Android 13
2024-04-28 06:49:01 -07:00
// SPDX-License-Identifier: GPL-2.0+
/*
* IUCV network driver
*
* Copyright IBM Corp. 2001, 2009
*
* Author(s):
* Original netiucv driver:
* Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
* Sysfs integration and all bugs therein:
* Cornelia Huck (cornelia.huck@de.ibm.com)
* PM functions:
* Ursula Braun (ursula.braun@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
*/
#define KMSG_COMPONENT "netiucv"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#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/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 <linux/uaccess.h>
#include <asm/ebcdic.h>
#include <net/iucv/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");
/**
* Debug Facility stuff
*/
#define IUCV_DBF_SETUP_NAME "iucv_setup"
#define IUCV_DBF_SETUP_LEN 64
#define IUCV_DBF_SETUP_PAGES 2
#define IUCV_DBF_SETUP_NR_AREAS 1
#define IUCV_DBF_SETUP_LEVEL 3
#define IUCV_DBF_DATA_NAME "iucv_data"
#define IUCV_DBF_DATA_LEN 128
#define IUCV_DBF_DATA_PAGES 2
#define IUCV_DBF_DATA_NR_AREAS 1
#define IUCV_DBF_DATA_LEVEL 2
#define IUCV_DBF_TRACE_NAME "iucv_trace"
#define IUCV_DBF_TRACE_LEN 16
#define IUCV_DBF_TRACE_PAGES 4
#define IUCV_DBF_TRACE_NR_AREAS 1
#define IUCV_DBF_TRACE_LEVEL 3
#define IUCV_DBF_TEXT(name,level,text) \
do { \
debug_text_event(iucv_dbf_##name,level,text); \
} while (0)
#define IUCV_DBF_HEX(name,level,addr,len) \
do { \
debug_event(iucv_dbf_##name,level,(void*)(addr),len); \
} while (0)
DECLARE_PER_CPU(char[256], iucv_dbf_txt_buf);
#define IUCV_DBF_TEXT_(name, level, text...) \
do { \
if (debug_level_enabled(iucv_dbf_##name, level)) { \
char* __buf = get_cpu_var(iucv_dbf_txt_buf); \
sprintf(__buf, text); \
debug_text_event(iucv_dbf_##name, level, __buf); \
put_cpu_var(iucv_dbf_txt_buf); \
} \
} while (0)
#define IUCV_DBF_SPRINTF(name,level,text...) \
do { \
debug_sprintf_event(iucv_dbf_trace, level, ##text ); \
debug_sprintf_event(iucv_dbf_trace, level, text ); \
} while (0)
/**
* some more debug stuff
*/
#define PRINTK_HEADER " iucv: " /* for debugging */
/* dummy device to make sure netiucv_pm functions are called */
static struct device *netiucv_dev;
static int netiucv_pm_prepare(struct device *);
static void netiucv_pm_complete(struct device *);
static int netiucv_pm_freeze(struct device *);
static int netiucv_pm_restore_thaw(struct device *);
static const struct dev_pm_ops netiucv_pm_ops = {
.prepare = netiucv_pm_prepare,
.complete = netiucv_pm_complete,
.freeze = netiucv_pm_freeze,
.thaw = netiucv_pm_restore_thaw,
.restore = netiucv_pm_restore_thaw,
};
static struct device_driver netiucv_driver = {
.owner = THIS_MODULE,
.name = "netiucv",
.bus = &iucv_bus,
.pm = &netiucv_pm_ops,
};
static int netiucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
static void netiucv_callback_connack(struct iucv_path *, u8 *);
static void netiucv_callback_connrej(struct iucv_path *, u8 *);
static void netiucv_callback_connsusp(struct iucv_path *, u8 *);
static void netiucv_callback_connres(struct iucv_path *, u8 *);
static void netiucv_callback_rx(struct iucv_path *, struct iucv_message *);
static void netiucv_callback_txdone(struct iucv_path *, struct iucv_message *);
static struct iucv_handler netiucv_handler = {
.path_pending = netiucv_callback_connreq,
.path_complete = netiucv_callback_connack,
.path_severed = netiucv_callback_connrej,
.path_quiesced = netiucv_callback_connsusp,
.path_resumed = netiucv_callback_connres,
.message_pending = netiucv_callback_rx,
.message_complete = netiucv_callback_txdone
};
/**
* 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;
unsigned long send_stamp;
unsigned long tx_pending;
unsigned long tx_max_pending;
};
/**
* Representation of one iucv connection
*/
struct iucv_connection {
struct list_head list;
struct iucv_path *path;
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];
char userdata[17];
};
/**
* Linked list of all connection structs.
*/
static LIST_HEAD(iucv_connection_list);
static DEFINE_RWLOCK(iucv_connection_rwlock);
/**
* 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;
int pm_state;
};
/**
* Link level header for a packet.
*/
struct ll_header {
u16 next;
};
#define NETIUCV_HDRLEN (sizeof(struct ll_header))
#define NETIUCV_BUFSIZE_MAX 65537
#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 void netiucv_clear_busy(struct net_device *dev)
{
struct netiucv_priv *priv = netdev_priv(dev);
clear_bit(0, &priv->tbusy);
netif_wake_queue(dev);
}
static int netiucv_test_and_set_busy(struct net_device *dev)
{
struct netiucv_priv *priv = netdev_priv(dev);
netif_stop_queue(dev);
return test_and_set_bit(0, &priv->tbusy);
}
static u8 iucvMagic_ascii[16] = {
0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
};
static u8 iucvMagic_ebcdic[16] = {
0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
};
/**
* Convert an iucv userId to its printable
* form (strip whitespace at end).
*
* @param An iucv userId
*
* @returns The printable string (static data!!)
*/
static char *netiucv_printname(char *name, int len)
{
static char tmp[17];
char *p = tmp;
memcpy(tmp, name, len);
tmp[len] = '\0';
while (*p && ((p - tmp) < len) && (!isspace(*p)))
p++;
*p = '\0';
return tmp;
}
static char *netiucv_printuser(struct iucv_connection *conn)
{
static char tmp_uid[9];
static char tmp_udat[17];
static char buf[100];
if (memcmp(conn->userdata, iucvMagic_ebcdic, 16)) {
tmp_uid[8] = '\0';
tmp_udat[16] = '\0';
memcpy(tmp_uid, netiucv_printname(conn->userid, 8), 8);
memcpy(tmp_udat, conn->userdata, 16);
EBCASC(tmp_udat, 16);
memcpy(tmp_udat, netiucv_printname(tmp_udat, 16), 16);
sprintf(buf, "%s.%s", tmp_uid, tmp_udat);
return buf;
} else
return netiucv_printname(conn->userid, 8);
}
/**
* 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)
{
debug_unregister(iucv_dbf_setup);
debug_unregister(iucv_dbf_data);
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,
u8 *ipuser)
{
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)
{
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)
{
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)
{
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 = cpu_to_be16(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) {
IUCV_DBF_TEXT(data, 2,
"Send confirmation for unlinked connection\n");
return;
}
privptr = netdev_priv(conn->netdev);
conn->prof.tx_pending--;
if (single_flag) {
if ((skb = skb_dequeue(&conn->commit_queue))) {
refcount_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;
skb_put_data(conn->tx_buff, &header, NETIUCV_HDRLEN);
skb_copy_from_linear_data(skb,
skb_put(conn->tx_buff, skb->len),
skb->len);
txbytes += skb->len;
txpackets++;
stat_maxcq++;
refcount_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;
skb_put_data(conn->tx_buff, &header, NETIUCV_HDRLEN);
conn->prof.send_stamp = jiffies;
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))) {
refcount_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 {
refcount_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);
skb_put_data(nskb, 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;
skb_put_data(nskb, &header, NETIUCV_HDRLEN);
fsm_newstate(conn->fsm, CONN_STATE_TX);
conn->prof.send_stamp = jiffies;
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);
refcount_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;
}
netif_trans_update(dev);
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;
}
/*
* 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;
unsigned int bs1;
int rc;
IUCV_DBF_TEXT(trace, 3, __func__);
if (count >= 39)
return -EINVAL;
rc = kstrtouint(buf, 0, &bs1);
if (rc == -EINVAL) {
IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %s\n",
buf);
return -EINVAL;
}
if ((rc == -ERANGE) || (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 const struct attribute_group *netiucv_attr_groups[] = {
&netiucv_stat_attr_group,
&netiucv_attr_group,
NULL,
};
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;
dev->groups = netiucv_attr_groups;
/*
* 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;
}
priv->dev = dev;
dev_set_drvdata(dev, priv);
return 0;
}
static void netiucv_unregister_device(struct device *dev)
{
IUCV_DBF_TEXT(trace, 3, __func__);
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() */
}
}
/**
* 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,
};
static void netiucv_setup_netdevice(struct net_device *dev)
{
dev->mtu = NETIUCV_MTU_DEFAULT;
dev->min_mtu = 576;
dev->max_mtu = NETIUCV_MTU_MAX;
dev->needs_free_netdev = true;
dev->priv_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",
NET_NAME_UNKNOWN, netiucv_setup_netdevice);
if (!dev)
return NULL;
rtnl_lock();
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:
rtnl_unlock();
free_netdev(dev);
return NULL;
}
static ssize_t connection_store(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) {
rtnl_unlock();
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_netdevice(dev);
rtnl_unlock();
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_WO(connection);
static ssize_t remove_store(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_WO(remove);
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");
Reference in a new issue Copy permalink