+++ /dev/null
-// 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 <linux/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 */
-
-static struct device_driver netiucv_driver = {
- .owner = THIS_MODULE,
- .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;
- 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;
-};
-
-/*
- * 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;
- netif_rx(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 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,
-};
-
-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;
-}
-
-/*
- * Start transmission of a packet.
- * Called from generic network device layer.
- */
-static netdev_tx_t 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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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 sysfs_emit(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;
- int ret;
-
- IUCV_DBF_TEXT(trace, 3, __func__);
-
- dev = iucv_alloc_device(netiucv_attr_groups, &netiucv_driver, NULL,
- "net%s", ndev->name);
- if (!dev)
- 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);
- }
-
- 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;
- }
-
- netiucv_banner();
- return rc;
-
-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");
projects / thirdparty / kernel / stable.git / commitdiff
