diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/net/netiucv.c | 2216 |
1 files changed, 2216 insertions, 0 deletions
diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c new file mode 100644 index 000000000..5ce2424ca --- /dev/null +++ b/drivers/s390/net/netiucv.c @@ -0,0 +1,2216 @@ +// 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"); |