drivers/s390/net/ctcm_main.h

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