LXR linux/drivers/s390/net/ctcm

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *      Copyright IBM Corp. 2001, 2007
   4 *      Authors:        Fritz Elfert (felfert@millenux.com)
   5 *                      Peter Tiedemann (ptiedem@de.ibm.com)
   6 */
   7
   8#ifndef _CTCM_MAIN_H_
   9#define _CTCM_MAIN_H_
  10
  11#include <asm/ccwdev.h>
  12#include <asm/ccwgroup.h>
  13
  14#include <linux/skbuff.h>
  15#include <linux/netdevice.h>
  16
  17#include "fsm.h"
  18#include "ctcm_dbug.h"
  19#include "ctcm_mpc.h"
  20
  21#define CTC_DRIVER_NAME "ctcm"
  22#define CTC_DEVICE_NAME "ctc"
  23#define MPC_DEVICE_NAME "mpc"
  24#define CTC_DEVICE_GENE CTC_DEVICE_NAME "%d"
  25#define MPC_DEVICE_GENE MPC_DEVICE_NAME "%d"
  26
  27#define CHANNEL_FLAGS_READ      0
  28#define CHANNEL_FLAGS_WRITE     1
  29#define CHANNEL_FLAGS_INUSE     2
  30#define CHANNEL_FLAGS_BUFSIZE_CHANGED   4
  31#define CHANNEL_FLAGS_FAILED    8
  32#define CHANNEL_FLAGS_WAITIRQ   16
  33#define CHANNEL_FLAGS_RWMASK    1
  34#define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
  35
  36#define LOG_FLAG_ILLEGALPKT     1
  37#define LOG_FLAG_ILLEGALSIZE    2
  38#define LOG_FLAG_OVERRUN        4
  39#define LOG_FLAG_NOMEM          8
  40
  41#define ctcm_pr_debug(fmt, arg...) printk(KERN_DEBUG fmt, ##arg)
  42
  43#define CTCM_PR_DEBUG(fmt, arg...) \
  44        do { \
  45                if (do_debug) \
  46                        printk(KERN_DEBUG fmt, ##arg); \
  47        } while (0)
  48
  49#define CTCM_PR_DBGDATA(fmt, arg...) \
  50        do { \
  51                if (do_debug_data) \
  52                        printk(KERN_DEBUG fmt, ##arg); \
  53        } while (0)
  54
  55#define CTCM_D3_DUMP(buf, len) \
  56        do { \
  57                if (do_debug_data) \
  58                        ctcmpc_dumpit(buf, len); \
  59        } while (0)
  60
  61#define CTCM_CCW_DUMP(buf, len) \
  62        do { \
  63                if (do_debug_ccw) \
  64                        ctcmpc_dumpit(buf, len); \
  65        } while (0)
  66
  67/**
  68 * Enum for classifying detected devices
  69 */
  70enum ctcm_channel_types {
  71        /* Device is not a channel  */
  72        ctcm_channel_type_none,
  73
  74        /* Device is a CTC/A */
  75        ctcm_channel_type_parallel,
  76
  77        /* Device is a FICON channel */
  78        ctcm_channel_type_ficon,
  79
  80        /* Device is a ESCON channel */
  81        ctcm_channel_type_escon
  82};
  83
  84/*
  85 * CCW commands, used in this driver.
  86 */
  87#define CCW_CMD_WRITE           0x01
  88#define CCW_CMD_READ            0x02
  89#define CCW_CMD_NOOP            0x03
  90#define CCW_CMD_TIC             0x08
  91#define CCW_CMD_SENSE_CMD       0x14
  92#define CCW_CMD_WRITE_CTL       0x17
  93#define CCW_CMD_SET_EXTENDED    0xc3
  94#define CCW_CMD_PREPARE         0xe3
  95
  96#define CTCM_PROTO_S390         0
  97#define CTCM_PROTO_LINUX        1
  98#define CTCM_PROTO_LINUX_TTY    2
  99#define CTCM_PROTO_OS390        3
 100#define CTCM_PROTO_MPC          4
 101#define CTCM_PROTO_MAX          4
 102
 103#define CTCM_BUFSIZE_LIMIT      65535
 104#define CTCM_BUFSIZE_DEFAULT    32768
 105#define MPC_BUFSIZE_DEFAULT     CTCM_BUFSIZE_LIMIT
 106
 107#define CTCM_TIME_1_SEC         1000
 108#define CTCM_TIME_5_SEC         5000
 109#define CTCM_TIME_10_SEC        10000
 110
 111#define CTCM_INITIAL_BLOCKLEN   2
 112
 113#define CTCM_READ               0
 114#define CTCM_WRITE              1
 115
 116#define CTCM_ID_SIZE            20+3
 117
 118struct ctcm_profile {
 119        unsigned long maxmulti;
 120        unsigned long maxcqueue;
 121        unsigned long doios_single;
 122        unsigned long doios_multi;
 123        unsigned long txlen;
 124        unsigned long tx_time;
 125        unsigned long send_stamp;
 126};
 127
 128/*
 129 * Definition of one channel
 130 */
 131struct channel {
 132        struct channel *next;
 133        char id[CTCM_ID_SIZE];
 134        struct ccw_device *cdev;
 135        /*
 136         * Type of this channel.
 137         * CTC/A or Escon for valid channels.
 138         */
 139        enum ctcm_channel_types type;
 140        /*
 141         * Misc. flags. See CHANNEL_FLAGS_... below
 142         */
 143        __u32 flags;
 144        __u16 protocol;         /* protocol of this channel (4 = MPC) */
 145        /*
 146         * I/O and irq related stuff
 147         */
 148        struct ccw1 *ccw;
 149        struct irb *irb;
 150        /*
 151         * RX/TX buffer size
 152         */
 153        int max_bufsize;
 154        struct sk_buff *trans_skb;      /* transmit/receive buffer */
 155        struct sk_buff_head io_queue;   /* universal I/O queue */
 156        struct tasklet_struct ch_tasklet;       /* MPC ONLY */
 157        /*
 158         * TX queue for collecting skb's during busy.
 159         */
 160        struct sk_buff_head collect_queue;
 161        /*
 162         * Amount of data in collect_queue.
 163         */
 164        int collect_len;
 165        /*
 166         * spinlock for collect_queue and collect_len
 167         */
 168        spinlock_t collect_lock;
 169        /*
 170         * Timer for detecting unresposive
 171         * I/O operations.
 172         */
 173        fsm_timer timer;
 174        /* MPC ONLY section begin */
 175        __u32   th_seq_num;     /* SNA TH seq number */
 176        __u8    th_seg;
 177        __u32   pdu_seq;
 178        struct sk_buff          *xid_skb;
 179        char                    *xid_skb_data;
 180        struct th_header        *xid_th;
 181        struct xid2             *xid;
 182        char                    *xid_id;
 183        struct th_header        *rcvd_xid_th;
 184        struct xid2             *rcvd_xid;
 185        char                    *rcvd_xid_id;
 186        __u8                    in_mpcgroup;
 187        fsm_timer               sweep_timer;
 188        struct sk_buff_head     sweep_queue;
 189        struct th_header        *discontact_th;
 190        struct tasklet_struct   ch_disc_tasklet;
 191        /* MPC ONLY section end */
 192
 193        int retry;              /* retry counter for misc. operations */
 194        fsm_instance *fsm;      /* finite state machine of this channel */
 195        struct net_device *netdev;      /* corresponding net_device */
 196        struct ctcm_profile prof;
 197        __u8 *trans_skb_data;
 198        __u16 logflags;
 199        __u8  sense_rc; /* last unit check sense code report control */
 200};
 201
 202struct ctcm_priv {
 203        struct net_device_stats stats;
 204        unsigned long   tbusy;
 205
 206        /* The MPC group struct of this interface */
 207        struct  mpc_group       *mpcg;  /* MPC only */
 208        struct  xid2            *xid;   /* MPC only */
 209
 210        /* The finite state machine of this interface */
 211        fsm_instance *fsm;
 212
 213        /* The protocol of this device */
 214        __u16 protocol;
 215
 216        /* Timer for restarting after I/O Errors */
 217        fsm_timer       restart_timer;
 218
 219        int buffer_size;        /* ctc only */
 220
 221        struct channel *channel[2];
 222};
 223
 224int ctcm_open(struct net_device *dev);
 225int ctcm_close(struct net_device *dev);
 226
 227extern const struct attribute_group *ctcm_attr_groups[];
 228
 229/*
 230 * Compatibility macros for busy handling
 231 * of network devices.
 232 */
 233static inline void ctcm_clear_busy_do(struct net_device *dev)
 234{
 235        clear_bit(0, &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
 236        netif_wake_queue(dev);
 237}
 238
 239static inline void ctcm_clear_busy(struct net_device *dev)
 240{
 241        struct mpc_group *grp;
 242        grp = ((struct ctcm_priv *)dev->ml_priv)->mpcg;
 243
 244        if (!(grp && grp->in_sweep))
 245                ctcm_clear_busy_do(dev);
 246}
 247
 248
 249static inline int ctcm_test_and_set_busy(struct net_device *dev)
 250{
 251        netif_stop_queue(dev);
 252        return test_and_set_bit(0,
 253                        &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
 254}
 255
 256extern int loglevel;
 257extern struct channel *channels;
 258
 259void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 260
 261/*
 262 * Functions related to setup and device detection.
 263 */
 264
 265static inline int ctcm_less_than(char *id1, char *id2)
 266{
 267        unsigned long dev1, dev2;
 268
 269        id1 = id1 + 5;
 270        id2 = id2 + 5;
 271
 272        dev1 = simple_strtoul(id1, &id1, 16);
 273        dev2 = simple_strtoul(id2, &id2, 16);
 274
 275        return (dev1 < dev2);
 276}
 277
 278int ctcm_ch_alloc_buffer(struct channel *ch);
 279
 280static inline int ctcm_checkalloc_buffer(struct channel *ch)
 281{
 282        if (ch->trans_skb == NULL)
 283                return ctcm_ch_alloc_buffer(ch);
 284        if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) {
 285                dev_kfree_skb(ch->trans_skb);
 286                return ctcm_ch_alloc_buffer(ch);
 287        }
 288        return 0;
 289}
 290
 291struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
 292
 293/* test if protocol attribute (of struct ctcm_priv or struct channel)
 294 * has MPC protocol setting. Type is not checked
 295 */
 296#define IS_MPC(p) ((p)->protocol == CTCM_PROTO_MPC)
 297
 298/* test if struct ctcm_priv of struct net_device has MPC protocol setting */
 299#define IS_MPCDEV(dev) IS_MPC((struct ctcm_priv *)dev->ml_priv)
 300
 301static inline gfp_t gfp_type(void)
 302{
 303        return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
 304}
 305
 306/*
 307 * Definition of our link level header.
 308 */
 309struct ll_header {
 310        __u16 length;
 311        __u16 type;
 312        __u16 unused;
 313};
 314#define LL_HEADER_LENGTH (sizeof(struct ll_header))
 315
 316#endif
 317