drivers/s390/net/ctcm_main.h

   1 /*
   2  *      drivers/s390/net/ctcm_main.h
   3  *
   4  *      Copyright IBM Corp. 2001, 2007
   5  *      Authors:        Fritz Elfert (felfert@millenux.com)
   6  *                      Peter Tiedemann (ptiedem@de.ibm.com)
   7  */
   8
   9 #ifndef _CTCM_MAIN_H_
  10 #define _CTCM_MAIN_H_
  11
  12 #include <asm/ccwdev.h>
  13 #include <asm/ccwgroup.h>
  14
  15 #include <linux/skbuff.h>
  16 #include <linux/netdevice.h>
  17
  18 #include "fsm.h"
  19 #include "ctcm_dbug.h"
  20 #include "ctcm_mpc.h"
  21
  22 #define CTC_DRIVER_NAME "ctcm"
  23 #define CTC_DEVICE_NAME "ctc"
  24 #define MPC_DEVICE_NAME "mpc"
  25 #define CTC_DEVICE_GENE CTC_DEVICE_NAME "%d"
  26 #define MPC_DEVICE_GENE MPC_DEVICE_NAME "%d"
  27
  28 #define CHANNEL_FLAGS_READ      0
  29 #define CHANNEL_FLAGS_WRITE     1
  30 #define CHANNEL_FLAGS_INUSE     2
  31 #define CHANNEL_FLAGS_BUFSIZE_CHANGED   4
  32 #define CHANNEL_FLAGS_FAILED    8
  33 #define CHANNEL_FLAGS_WAITIRQ   16
  34 #define CHANNEL_FLAGS_RWMASK    1
  35 #define CHANNEL_DIRECTION(f) (f & CHANNEL_FLAGS_RWMASK)
  36
  37 #define LOG_FLAG_ILLEGALPKT     1
  38 #define LOG_FLAG_ILLEGALSIZE    2
  39 #define LOG_FLAG_OVERRUN        4
  40 #define LOG_FLAG_NOMEM          8
  41
  42 #define ctcm_pr_debug(fmt, arg...) printk(KERN_DEBUG fmt, ##arg)
  43
  44 #define CTCM_PR_DEBUG(fmt, arg...) \
  45         do { \
  46                 if (do_debug) \
  47                         printk(KERN_DEBUG fmt, ##arg); \
  48         } while (0)
  49
  50 #define CTCM_PR_DBGDATA(fmt, arg...) \
  51         do { \
  52                 if (do_debug_data) \
  53                         printk(KERN_DEBUG fmt, ##arg); \
  54         } while (0)
  55
  56 #define CTCM_D3_DUMP(buf, len) \
  57         do { \
  58                 if (do_debug_data) \
  59                         ctcmpc_dumpit(buf, len); \
  60         } while (0)
  61
  62 #define CTCM_CCW_DUMP(buf, len) \
  63         do { \
  64                 if (do_debug_ccw) \
  65                         ctcmpc_dumpit(buf, len); \
  66         } while (0)
  67
  68 /**
  69  * Enum for classifying detected devices
  70  */
  71 enum ctcm_channel_types {
  72         /* Device is not a channel  */
  73         ctcm_channel_type_none,
  74
  75         /* Device is a CTC/A */
  76         ctcm_channel_type_parallel,
  77
  78         /* Device is a FICON channel */
  79         ctcm_channel_type_ficon,
  80
  81         /* Device is a ESCON channel */
  82         ctcm_channel_type_escon
  83 };
  84
  85 /*
  86  * CCW commands, used in this driver.
  87  */
  88 #define CCW_CMD_WRITE           0x01
  89 #define CCW_CMD_READ            0x02
  90 #define CCW_CMD_NOOP            0x03
  91 #define CCW_CMD_TIC             0x08
  92 #define CCW_CMD_SENSE_CMD       0x14
  93 #define CCW_CMD_WRITE_CTL       0x17
  94 #define CCW_CMD_SET_EXTENDED    0xc3
  95 #define CCW_CMD_PREPARE         0xe3
  96
  97 #define CTCM_PROTO_S390         0
  98 #define CTCM_PROTO_LINUX        1
  99 #define CTCM_PROTO_LINUX_TTY    2
 100 #define CTCM_PROTO_OS390        3
 101 #define CTCM_PROTO_MPC          4
 102 #define CTCM_PROTO_MAX          4
 103
 104 #define CTCM_BUFSIZE_LIMIT      65535
 105 #define CTCM_BUFSIZE_DEFAULT    32768
 106 #define MPC_BUFSIZE_DEFAULT     CTCM_BUFSIZE_LIMIT
 107
 108 #define CTCM_TIME_1_SEC         1000
 109 #define CTCM_TIME_5_SEC         5000
 110 #define CTCM_TIME_10_SEC        10000
 111
 112 #define CTCM_INITIAL_BLOCKLEN   2
 113
 114 #define READ                    0
 115 #define WRITE                   1
 116
 117 #define CTCM_ID_SIZE            20+3
 118
 119 struct ctcm_profile {
 120         unsigned long maxmulti;
 121         unsigned long maxcqueue;
 122         unsigned long doios_single;
 123         unsigned long doios_multi;
 124         unsigned long txlen;
 125         unsigned long tx_time;
 126         struct timespec send_stamp;
 127 };
 128
 129 /*
 130  * Definition of one channel
 131  */
 132 struct channel {
 133         struct channel *next;
 134         char id[CTCM_ID_SIZE];
 135         struct ccw_device *cdev;
 136         /*
 137          * Type of this channel.
 138          * CTC/A or Escon for valid channels.
 139          */
 140         enum ctcm_channel_types type;
 141         /*
 142          * Misc. flags. See CHANNEL_FLAGS_... below
 143          */
 144         __u32 flags;
 145         __u16 protocol;         /* protocol of this channel (4 = MPC) */
 146         /*
 147          * I/O and irq related stuff
 148          */
 149         struct ccw1 *ccw;
 150         struct irb *irb;
 151         /*
 152          * RX/TX buffer size
 153          */
 154         int max_bufsize;
 155         struct sk_buff *trans_skb;      /* transmit/receive buffer */
 156         struct sk_buff_head io_queue;   /* universal I/O queue */
 157         struct tasklet_struct ch_tasklet;       /* MPC ONLY */
 158         /*
 159          * TX queue for collecting skb's during busy.
 160          */
 161         struct sk_buff_head collect_queue;
 162         /*
 163          * Amount of data in collect_queue.
 164          */
 165         int collect_len;
 166         /*
 167          * spinlock for collect_queue and collect_len
 168          */
 169         spinlock_t collect_lock;
 170         /*
 171          * Timer for detecting unresposive
 172          * I/O operations.
 173          */
 174         fsm_timer timer;
 175         /* MPC ONLY section begin */
 176         __u32   th_seq_num;     /* SNA TH seq number */
 177         __u8    th_seg;
 178         __u32   pdu_seq;
 179         struct sk_buff          *xid_skb;
 180         char                    *xid_skb_data;
 181         struct th_header        *xid_th;
 182         struct xid2             *xid;
 183         char                    *xid_id;
 184         struct th_header        *rcvd_xid_th;
 185         struct xid2             *rcvd_xid;
 186         char                    *rcvd_xid_id;
 187         __u8                    in_mpcgroup;
 188         fsm_timer               sweep_timer;
 189         struct sk_buff_head     sweep_queue;
 190         struct th_header        *discontact_th;
 191         struct tasklet_struct   ch_disc_tasklet;
 192         /* MPC ONLY section end */
 193
 194         int retry;              /* retry counter for misc. operations */
 195         fsm_instance *fsm;      /* finite state machine of this channel */
 196         struct net_device *netdev;      /* corresponding net_device */
 197         struct ctcm_profile prof;
 198         __u8 *trans_skb_data;
 199         __u16 logflags;
 200         __u8  sense_rc; /* last unit check sense code report control */
 201 };
 202
 203 struct ctcm_priv {
 204         struct net_device_stats stats;
 205         unsigned long   tbusy;
 206
 207         /* The MPC group struct of this interface */
 208         struct  mpc_group       *mpcg;  /* MPC only */
 209         struct  xid2            *xid;   /* MPC only */
 210
 211         /* The finite state machine of this interface */
 212         fsm_instance *fsm;
 213
 214         /* The protocol of this device */
 215         __u16 protocol;
 216
 217         /* Timer for restarting after I/O Errors */
 218         fsm_timer       restart_timer;
 219
 220         int buffer_size;        /* ctc only */
 221
 222         struct channel *channel[2];
 223 };
 224
 225 int ctcm_open(struct net_device *dev);
 226 int ctcm_close(struct net_device *dev);
 227
 228 /*
 229  * prototypes for non-static sysfs functions
 230  */
 231 int ctcm_add_attributes(struct device *dev);
 232 void ctcm_remove_attributes(struct device *dev);
 233 int ctcm_add_files(struct device *dev);
 234 void ctcm_remove_files(struct device *dev);
 235
 236 /*
 237  * Compatibility macros for busy handling
 238  * of network devices.
 239  */
 240 static inline void ctcm_clear_busy_do(struct net_device *dev)
 241 {
 242         clear_bit(0, &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
 243         netif_wake_queue(dev);
 244 }
 245
 246 static inline void ctcm_clear_busy(struct net_device *dev)
 247 {
 248         struct mpc_group *grp;
 249         grp = ((struct ctcm_priv *)dev->ml_priv)->mpcg;
 250
 251         if (!(grp && grp->in_sweep))
 252                 ctcm_clear_busy_do(dev);
 253 }
 254
 255
 256 static inline int ctcm_test_and_set_busy(struct net_device *dev)
 257 {
 258         netif_stop_queue(dev);
 259         return test_and_set_bit(0,
 260                         &(((struct ctcm_priv *)dev->ml_priv)->tbusy));
 261 }
 262
 263 extern int loglevel;
 264 extern struct channel *channels;
 265
 266 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 267
 268 /*
 269  * Functions related to setup and device detection.
 270  */
 271
 272 static inline int ctcm_less_than(char *id1, char *id2)
 273 {
 274         unsigned long dev1, dev2;
 275
 276         id1 = id1 + 5;
 277         id2 = id2 + 5;
 278
 279         dev1 = simple_strtoul(id1, &id1, 16);
 280         dev2 = simple_strtoul(id2, &id2, 16);
 281
 282         return (dev1 < dev2);
 283 }
 284
 285 int ctcm_ch_alloc_buffer(struct channel *ch);
 286
 287 static inline int ctcm_checkalloc_buffer(struct channel *ch)
 288 {
 289         if (ch->trans_skb == NULL)
 290                 return ctcm_ch_alloc_buffer(ch);
 291         if (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED) {
 292                 dev_kfree_skb(ch->trans_skb);
 293                 return ctcm_ch_alloc_buffer(ch);
 294         }
 295         return 0;
 296 }
 297
 298 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
 299
 300 /* test if protocol attribute (of struct ctcm_priv or struct channel)
 301  * has MPC protocol setting. Type is not checked
 302  */
 303 #define IS_MPC(p) ((p)->protocol == CTCM_PROTO_MPC)
 304
 305 /* test if struct ctcm_priv of struct net_device has MPC protocol setting */
 306 #define IS_MPCDEV(dev) IS_MPC((struct ctcm_priv *)dev->ml_priv)
 307
 308 static inline gfp_t gfp_type(void)
 309 {
 310         return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
 311 }
 312
 313 /*
 314  * Definition of our link level header.
 315  */
 316 struct ll_header {
 317         __u16 length;
 318         __u16 type;
 319         __u16 unused;
 320 };
 321 #define LL_HEADER_LENGTH (sizeof(struct ll_header))
 322
 323 #endif