The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netatm/atm_stack.h

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    1 /*-
    2  *
    3  * ===================================
    4  * HARP  |  Host ATM Research Platform
    5  * ===================================
    6  *
    7  *
    8  * This Host ATM Research Platform ("HARP") file (the "Software") is
    9  * made available by Network Computing Services, Inc. ("NetworkCS")
   10  * "AS IS".  NetworkCS does not provide maintenance, improvements or
   11  * support of any kind.
   12  *
   13  * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
   14  * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
   15  * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
   16  * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
   17  * In no event shall NetworkCS be responsible for any damages, including
   18  * but not limited to consequential damages, arising from or relating to
   19  * any use of the Software or related support.
   20  *
   21  * Copyright 1994-1998 Network Computing Services, Inc.
   22  *
   23  * Copies of this Software may be made, however, the above copyright
   24  * notice must be reproduced on all copies.
   25  *
   26  *      @(#) $FreeBSD: src/sys/netatm/atm_stack.h,v 1.6 2005/01/07 01:45:36 imp Exp $
   27  *
   28  */
   29 
   30 /*
   31  * Core ATM Services
   32  * -----------------
   33  *
   34  * ATM Stack definitions
   35  *
   36  */
   37 
   38 #ifndef _NETATM_ATM_STACK_H
   39 #define _NETATM_ATM_STACK_H
   40 
   41 #ifdef _KERNEL
   42 /*
   43  * Structure used to define a kernel-provided ATM stack service and its
   44  * associated entry points.  Each stack service provider must register
   45  * themselves before they will be used.  ATM stack service providers include 
   46  * kernel modules (both linked and loaded) and device drivers, which must list
   47  * (via its atm_pif) any of its available hardware-supplied stack services 
   48  * (such as on-card AAL processing).
   49  */
   50 struct stack_defn {
   51         struct stack_defn *sd_next;     /* Next in registry list */
   52         Sap_t           sd_sap;         /* Stack instance SAP */
   53         u_char          sd_flag;        /* Flags (see below) */
   54 /* Exported functions */
   55         int             (*sd_inst)      /* Stack instantiation */
   56                                 (struct stack_defn **, Atm_connvc *);
   57         void            (*sd_lower)     /* Lower (from above) command handler */
   58                                 (int, void *, intptr_t, intptr_t);
   59         void            (*sd_upper)     /* Upper (from below) command handler */
   60                                 (int, void *, intptr_t, intptr_t);
   61 /* Variables used during stack instantiation */
   62         void            *sd_toku;       /* Stack service instance token */
   63 };
   64 
   65 /*
   66  * Stack Service Flags
   67  */
   68 #define SDF_TERM        0x01            /* Terminal (to lowest layer) service */
   69 
   70 
   71 /*
   72  * Stack Specification List  
   73  *
   74  * The list names the stack services and their layering relationships in
   75  * order to construct a stack to provide the protocol services defined
   76  * by the list.  The list is ordered starting from the stack service 
   77  * interfacing with the user "down" to the ATM cell service.
   78  */
   79 #define STACK_CNT       8               /* Max services in a stack list */
   80 struct stack_list {
   81         Sap_t           sl_sap[STACK_CNT];      /* Stack service SAP list */
   82 };
   83 
   84 
   85 /*
   86  * Structure used during the construction and instantiation of a stack 
   87  * instance from a supplied stack list.  It contains pointers to the stack 
   88  * service definitions which will be used to implement the stack.  The first 
   89  * element in the array is reserved for the user's "stack service".
   90  */
   91 struct stack_inst {
   92         struct stack_defn *si_srvc[STACK_CNT+1];        /* Assigned services */
   93 };
   94 
   95 
   96 /*
   97  * Macros to update buffer headroom values during stack instantiation.
   98  *
   99  * These values are advisory, i.e. every service must verify the amount
  100  * of available space in input/output messages and allocate new buffers
  101  * if needed.
  102  *
  103  * The 'maximum' and 'minimum' values used below may be chosen by a 
  104  * service to reflect the typical, expected message traffic pattern 
  105  * for a specific connection.
  106  * 
  107  * The macro arguments are:
  108  *      cvp = pointer to connection vcc;
  109  *      hi = maximum amount of buffer headroom required by the current
  110  *           service during input message processing;
  111  *      si = minimum amount of buffer data stripped off the front 
  112  *           of an input message by the current service;
  113  *      ho = maximum amount of buffer headroom required by the current
  114  *           service during output message processing;
  115  *      ao = maximum amount of buffer data added to the front 
  116  *           of an output message by the current service;
  117  */
  118 #define HEADIN(cvp, hi, si)                                     \
  119 {                                                               \
  120         short   t = (cvp)->cvc_attr.headin - (si);              \
  121         t = (t >= (hi)) ? t : (hi);                             \
  122         (cvp)->cvc_attr.headin = roundup(t, sizeof(long));      \
  123 }
  124 
  125 #define HEADOUT(cvp, ho, ao)                                    \
  126 {                                                               \
  127         short   t = (cvp)->cvc_attr.headout + (ao);             \
  128         t = (t >= (ho)) ? t : (ho);                             \
  129         (cvp)->cvc_attr.headout = roundup(t, sizeof(long));     \
  130 }
  131 
  132 
  133 /*
  134  * Stack command codes - All stack command codes are specific to the 
  135  * defined stack SAP across which the command is used.  Command values 0-15 
  136  * are reserved for any common codes, which all stack SAPs must support.
  137  */
  138 #define STKCMD(s, d, v) (((s) << 16) | (d) | (v))
  139 #define STKCMD_DOWN     0
  140 #define STKCMD_UP       0x00008000
  141 #define STKCMD_SAP_MASK 0xffff0000
  142 #define STKCMD_VAL_MASK 0x00007fff
  143 
  144 /* Common command values (0-15) */
  145 #define CCV_INIT        1               /* DOWN */
  146 #define CCV_TERM        2               /* DOWN */
  147 
  148 /* SAP_ATM */
  149 #define ATM_INIT                STKCMD(SAP_ATM, STKCMD_DOWN, CCV_INIT)
  150 #define ATM_TERM                STKCMD(SAP_ATM, STKCMD_DOWN, CCV_TERM)
  151 #define ATM_DATA_REQ            STKCMD(SAP_ATM, STKCMD_DOWN, 16)
  152 #define ATM_DATA_IND            STKCMD(SAP_ATM, STKCMD_UP, 17)
  153 
  154 /* SAP_SAR */
  155 #define SAR_INIT                STKCMD(SAP_SAR, STKCMD_DOWN, CCV_INIT)
  156 #define SAR_TERM                STKCMD(SAP_SAR, STKCMD_DOWN, CCV_TERM)
  157 #define SAR_UNITDATA_INV        STKCMD(SAP_SAR, STKCMD_DOWN, 16)
  158 #define SAR_UNITDATA_SIG        STKCMD(SAP_SAR, STKCMD_UP, 17)
  159 #define SAR_UABORT_INV          STKCMD(SAP_SAR, STKCMD_DOWN, 18)
  160 #define SAR_UABORT_SIG          STKCMD(SAP_SAR, STKCMD_UP, 19)
  161 #define SAR_PABORT_SIG          STKCMD(SAP_SAR, STKCMD_UP, 20)
  162 
  163 /* SAP_CPCS */
  164 #define CPCS_INIT               STKCMD(SAP_CPCS, STKCMD_DOWN, CCV_INIT)
  165 #define CPCS_TERM               STKCMD(SAP_CPCS, STKCMD_DOWN, CCV_TERM)
  166 #define CPCS_UNITDATA_INV       STKCMD(SAP_CPCS, STKCMD_DOWN, 16)
  167 #define CPCS_UNITDATA_SIG       STKCMD(SAP_CPCS, STKCMD_UP, 17)
  168 #define CPCS_UABORT_INV         STKCMD(SAP_CPCS, STKCMD_DOWN, 18)
  169 #define CPCS_UABORT_SIG         STKCMD(SAP_CPCS, STKCMD_UP, 19)
  170 #define CPCS_PABORT_SIG         STKCMD(SAP_CPCS, STKCMD_UP, 20)
  171 
  172 /* SAP_SSCOP */
  173 #define SSCOP_INIT              STKCMD(SAP_SSCOP, STKCMD_DOWN, CCV_INIT)
  174 #define SSCOP_TERM              STKCMD(SAP_SSCOP, STKCMD_DOWN, CCV_TERM)
  175 #define SSCOP_ESTABLISH_REQ     STKCMD(SAP_SSCOP, STKCMD_DOWN, 16)
  176 #define SSCOP_ESTABLISH_IND     STKCMD(SAP_SSCOP, STKCMD_UP, 17)
  177 #define SSCOP_ESTABLISH_RSP     STKCMD(SAP_SSCOP, STKCMD_DOWN, 18)
  178 #define SSCOP_ESTABLISH_CNF     STKCMD(SAP_SSCOP, STKCMD_UP, 19)
  179 #define SSCOP_RELEASE_REQ       STKCMD(SAP_SSCOP, STKCMD_DOWN, 20)
  180 #define SSCOP_RELEASE_IND       STKCMD(SAP_SSCOP, STKCMD_UP, 21)
  181 #define SSCOP_RELEASE_CNF       STKCMD(SAP_SSCOP, STKCMD_UP, 22)
  182 #define SSCOP_DATA_REQ          STKCMD(SAP_SSCOP, STKCMD_DOWN, 23)
  183 #define SSCOP_DATA_IND          STKCMD(SAP_SSCOP, STKCMD_UP, 24)
  184 #define SSCOP_RESYNC_REQ        STKCMD(SAP_SSCOP, STKCMD_DOWN, 25)
  185 #define SSCOP_RESYNC_IND        STKCMD(SAP_SSCOP, STKCMD_UP, 26)
  186 #define SSCOP_RESYNC_RSP        STKCMD(SAP_SSCOP, STKCMD_DOWN, 27)
  187 #define SSCOP_RESYNC_CNF        STKCMD(SAP_SSCOP, STKCMD_UP, 28)
  188 #define SSCOP_RECOVER_IND       STKCMD(SAP_SSCOP, STKCMD_UP, 29)
  189 #define SSCOP_RECOVER_RSP       STKCMD(SAP_SSCOP, STKCMD_DOWN, 30)
  190 #define SSCOP_UNITDATA_REQ      STKCMD(SAP_SSCOP, STKCMD_DOWN, 31)
  191 #define SSCOP_UNITDATA_IND      STKCMD(SAP_SSCOP, STKCMD_UP, 32)
  192 #define SSCOP_RETRIEVE_REQ      STKCMD(SAP_SSCOP, STKCMD_DOWN, 33)
  193 #define SSCOP_RETRIEVE_IND      STKCMD(SAP_SSCOP, STKCMD_UP, 34)
  194 #define SSCOP_RETRIEVECMP_IND   STKCMD(SAP_SSCOP, STKCMD_UP, 35)
  195 
  196 /* SAP_SSCF_UNI */
  197 #define SSCF_UNI_INIT           STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, CCV_INIT)
  198 #define SSCF_UNI_TERM           STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, CCV_TERM)
  199 #define SSCF_UNI_ESTABLISH_REQ  STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 16)
  200 #define SSCF_UNI_ESTABLISH_IND  STKCMD(SAP_SSCF_UNI, STKCMD_UP, 17)
  201 #define SSCF_UNI_ESTABLISH_CNF  STKCMD(SAP_SSCF_UNI, STKCMD_UP, 18)
  202 #define SSCF_UNI_RELEASE_REQ    STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 19)
  203 #define SSCF_UNI_RELEASE_IND    STKCMD(SAP_SSCF_UNI, STKCMD_UP, 20)
  204 #define SSCF_UNI_RELEASE_CNF    STKCMD(SAP_SSCF_UNI, STKCMD_UP, 21)
  205 #define SSCF_UNI_DATA_REQ       STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 22)
  206 #define SSCF_UNI_DATA_IND       STKCMD(SAP_SSCF_UNI, STKCMD_UP, 23)
  207 #define SSCF_UNI_UNITDATA_REQ   STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 24)
  208 #define SSCF_UNI_UNITDATA_IND   STKCMD(SAP_SSCF_UNI, STKCMD_UP, 25)
  209 
  210 
  211 /*
  212  * The STACK_CALL macro must be used for all stack calls between adjacent
  213  * entities.  In order to avoid the problem with recursive stack calls 
  214  * modifying protocol state, this macro will only allow calls to proceed if 
  215  * they are not "against the flow" of any currently pending calls for a
  216  * stack instance.  If the requested call can't be processed now, it will 
  217  * be deferred and queued until a later, safe time (but before control is 
  218  * returned back to the kernel scheduler) when it will be dispatched.
  219  *
  220  * The STACK_CALL macro arguments are:
  221  *      cmd = command code;
  222  *      fn  = Destination entity processing function
  223  *      tok = Destination layer's session token;
  224  *      cvp = Connection VCC address;
  225  *      a1  = command specific argument;
  226  *      a2  = command specific argument;
  227  *      ret = call result value (0 => success)
  228  *
  229  * The receiving entity command processing function prototype is:
  230  *
  231  *      void (fn)(int cmd, int tok, int arg1, int arg2)
  232  *
  233  */
  234 #define STACK_CALL(cmd, fn, tok, cvp, a1, a2, ret)                      \
  235 {                                                                       \
  236         if ((cmd) & STKCMD_UP) {                                        \
  237                 if ((cvp)->cvc_downcnt) {                               \
  238                         (ret) = atm_stack_enq((cmd), (fn), (tok),       \
  239                                                 (cvp), (a1), (a2));     \
  240                 } else {                                                \
  241                         (cvp)->cvc_upcnt++;                             \
  242                         (*fn)(cmd, tok, a1, a2);                        \
  243                         (cvp)->cvc_upcnt--;                             \
  244                         (ret) = 0;                                      \
  245                 }                                                       \
  246         } else {                                                        \
  247                 if ((cvp)->cvc_upcnt) {                                 \
  248                         (ret) = atm_stack_enq((cmd), (fn), (tok),       \
  249                                                 (cvp), (a1), (a2));     \
  250                 } else {                                                \
  251                         (cvp)->cvc_downcnt++;                           \
  252                         (*fn)(cmd, tok, a1, a2);                        \
  253                         (cvp)->cvc_downcnt--;                           \
  254                         (ret) = 0;                                      \
  255                 }                                                       \
  256         }                                                               \
  257 }
  258 
  259 
  260 /*
  261  * Stack queue entry - The stack queue will contain stack calls which have 
  262  * been deferred in order to avoid recursive calls to a single protocol 
  263  * control block.  The queue entries are allocated from its own storage pool.
  264  */
  265 struct stackq_entry {
  266         struct stackq_entry *sq_next;   /* Next entry in queue */
  267         int             sq_cmd;         /* Stack command */
  268         void            (*sq_func)      /* Destination function */
  269                                 (int, void *, intptr_t, intptr_t);
  270         void            *sq_token;      /* Destination token */
  271         intptr_t        sq_arg1;        /* Command-specific argument */
  272         intptr_t        sq_arg2;        /* Command-specific argument */
  273         Atm_connvc      *sq_connvc;     /* Connection VCC */
  274 };
  275 
  276 
  277 /*
  278  * Macro to avoid unnecessary function call when draining the stack queue.
  279  */
  280 #define STACK_DRAIN()                                                   \
  281 {                                                                       \
  282         if (atm_stackq_head)                                            \
  283                 atm_stack_drain();                                      \
  284 }
  285 #endif  /* _KERNEL */
  286 
  287 #endif  /* _NETATM_ATM_STACK_H */

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