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288 lines
10 KiB
C
288 lines
10 KiB
C
/*
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*
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* ===================================
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* HARP | Host ATM Research Platform
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* ===================================
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*
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*
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* This Host ATM Research Platform ("HARP") file (the "Software") is
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* made available by Network Computing Services, Inc. ("NetworkCS")
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* "AS IS". NetworkCS does not provide maintenance, improvements or
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* support of any kind.
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*
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* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
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* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
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* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
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* In no event shall NetworkCS be responsible for any damages, including
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* but not limited to consequential damages, arising from or relating to
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* any use of the Software or related support.
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*
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* Copyright 1994-1998 Network Computing Services, Inc.
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*
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* Copies of this Software may be made, however, the above copyright
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* notice must be reproduced on all copies.
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*
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* @(#) $FreeBSD$
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*
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*/
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/*
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* Core ATM Services
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* -----------------
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*
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* ATM Stack definitions
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*
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*/
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#ifndef _NETATM_ATM_STACK_H
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#define _NETATM_ATM_STACK_H
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#ifdef _KERNEL
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/*
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* Structure used to define a kernel-provided ATM stack service and its
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* associated entry points. Each stack service provider must register
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* themselves before they will be used. ATM stack service providers include
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* kernel modules (both linked and loaded) and device drivers, which must list
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* (via its atm_pif) any of its available hardware-supplied stack services
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* (such as on-card AAL processing).
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*/
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struct stack_defn {
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struct stack_defn *sd_next; /* Next in registry list */
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Sap_t sd_sap; /* Stack instance SAP */
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u_char sd_flag; /* Flags (see below) */
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/* Exported functions */
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int (*sd_inst) /* Stack instantiation */
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(struct stack_defn **, Atm_connvc *);
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void (*sd_lower) /* Lower (from above) command handler */
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(int, void *, int, int);
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void (*sd_upper) /* Upper (from below) command handler */
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(int, void *, int, int);
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/* Variables used during stack instantiation */
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void *sd_toku; /* Stack service instance token */
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};
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/*
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* Stack Service Flags
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*/
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#define SDF_TERM 0x01 /* Terminal (to lowest layer) service */
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/*
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* Stack Specification List
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*
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* The list names the stack services and their layering relationships in
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* order to construct a stack to provide the protocol services defined
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* by the list. The list is ordered starting from the stack service
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* interfacing with the user "down" to the ATM cell service.
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*/
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#define STACK_CNT 8 /* Max services in a stack list */
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struct stack_list {
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Sap_t sl_sap[STACK_CNT]; /* Stack service SAP list */
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};
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/*
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* Structure used during the construction and instantiation of a stack
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* instance from a supplied stack list. It contains pointers to the stack
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* service definitions which will be used to implement the stack. The first
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* element in the array is reserved for the user's "stack service".
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*/
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struct stack_inst {
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struct stack_defn *si_srvc[STACK_CNT+1]; /* Assigned services */
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};
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/*
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* Macros to update buffer headroom values during stack instantiation.
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*
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* These values are advisory, i.e. every service must verify the amount
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* of available space in input/output messages and allocate new buffers
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* if needed.
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*
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* The 'maximum' and 'minimum' values used below may be chosen by a
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* service to reflect the typical, expected message traffic pattern
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* for a specific connection.
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*
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* The macro arguments are:
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* cvp = pointer to connection vcc;
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* hi = maximum amount of buffer headroom required by the current
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* service during input message processing;
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* si = minimum amount of buffer data stripped off the front
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* of an input message by the current service;
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* ho = maximum amount of buffer headroom required by the current
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* service during output message processing;
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* ao = maximum amount of buffer data added to the front
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* of an output message by the current service;
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*/
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#define HEADIN(cvp, hi, si) \
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{ \
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short t = (cvp)->cvc_attr.headin - (si); \
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t = (t >= (hi)) ? t : (hi); \
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(cvp)->cvc_attr.headin = roundup(t, sizeof(long)); \
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}
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#define HEADOUT(cvp, ho, ao) \
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{ \
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short t = (cvp)->cvc_attr.headout + (ao); \
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t = (t >= (ho)) ? t : (ho); \
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(cvp)->cvc_attr.headout = roundup(t, sizeof(long)); \
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}
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/*
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* Stack command codes - All stack command codes are specific to the
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* defined stack SAP across which the command is used. Command values 0-15
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* are reserved for any common codes, which all stack SAPs must support.
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*/
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#define STKCMD(s, d, v) (((s) << 16) | (d) | (v))
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#define STKCMD_DOWN 0
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#define STKCMD_UP 0x00008000
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#define STKCMD_SAP_MASK 0xffff0000
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#define STKCMD_VAL_MASK 0x00007fff
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/* Common command values (0-15) */
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#define CCV_INIT 1 /* DOWN */
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#define CCV_TERM 2 /* DOWN */
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/* SAP_ATM */
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#define ATM_INIT STKCMD(SAP_ATM, STKCMD_DOWN, CCV_INIT)
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#define ATM_TERM STKCMD(SAP_ATM, STKCMD_DOWN, CCV_TERM)
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#define ATM_DATA_REQ STKCMD(SAP_ATM, STKCMD_DOWN, 16)
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#define ATM_DATA_IND STKCMD(SAP_ATM, STKCMD_UP, 17)
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/* SAP_SAR */
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#define SAR_INIT STKCMD(SAP_SAR, STKCMD_DOWN, CCV_INIT)
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#define SAR_TERM STKCMD(SAP_SAR, STKCMD_DOWN, CCV_TERM)
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#define SAR_UNITDATA_INV STKCMD(SAP_SAR, STKCMD_DOWN, 16)
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#define SAR_UNITDATA_SIG STKCMD(SAP_SAR, STKCMD_UP, 17)
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#define SAR_UABORT_INV STKCMD(SAP_SAR, STKCMD_DOWN, 18)
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#define SAR_UABORT_SIG STKCMD(SAP_SAR, STKCMD_UP, 19)
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#define SAR_PABORT_SIG STKCMD(SAP_SAR, STKCMD_UP, 20)
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/* SAP_CPCS */
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#define CPCS_INIT STKCMD(SAP_CPCS, STKCMD_DOWN, CCV_INIT)
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#define CPCS_TERM STKCMD(SAP_CPCS, STKCMD_DOWN, CCV_TERM)
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#define CPCS_UNITDATA_INV STKCMD(SAP_CPCS, STKCMD_DOWN, 16)
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#define CPCS_UNITDATA_SIG STKCMD(SAP_CPCS, STKCMD_UP, 17)
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#define CPCS_UABORT_INV STKCMD(SAP_CPCS, STKCMD_DOWN, 18)
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#define CPCS_UABORT_SIG STKCMD(SAP_CPCS, STKCMD_UP, 19)
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#define CPCS_PABORT_SIG STKCMD(SAP_CPCS, STKCMD_UP, 20)
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/* SAP_SSCOP */
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#define SSCOP_INIT STKCMD(SAP_SSCOP, STKCMD_DOWN, CCV_INIT)
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#define SSCOP_TERM STKCMD(SAP_SSCOP, STKCMD_DOWN, CCV_TERM)
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#define SSCOP_ESTABLISH_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 16)
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#define SSCOP_ESTABLISH_IND STKCMD(SAP_SSCOP, STKCMD_UP, 17)
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#define SSCOP_ESTABLISH_RSP STKCMD(SAP_SSCOP, STKCMD_DOWN, 18)
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#define SSCOP_ESTABLISH_CNF STKCMD(SAP_SSCOP, STKCMD_UP, 19)
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#define SSCOP_RELEASE_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 20)
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#define SSCOP_RELEASE_IND STKCMD(SAP_SSCOP, STKCMD_UP, 21)
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#define SSCOP_RELEASE_CNF STKCMD(SAP_SSCOP, STKCMD_UP, 22)
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#define SSCOP_DATA_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 23)
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#define SSCOP_DATA_IND STKCMD(SAP_SSCOP, STKCMD_UP, 24)
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#define SSCOP_RESYNC_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 25)
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#define SSCOP_RESYNC_IND STKCMD(SAP_SSCOP, STKCMD_UP, 26)
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#define SSCOP_RESYNC_RSP STKCMD(SAP_SSCOP, STKCMD_DOWN, 27)
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#define SSCOP_RESYNC_CNF STKCMD(SAP_SSCOP, STKCMD_UP, 28)
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#define SSCOP_RECOVER_IND STKCMD(SAP_SSCOP, STKCMD_UP, 29)
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#define SSCOP_RECOVER_RSP STKCMD(SAP_SSCOP, STKCMD_DOWN, 30)
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#define SSCOP_UNITDATA_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 31)
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#define SSCOP_UNITDATA_IND STKCMD(SAP_SSCOP, STKCMD_UP, 32)
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#define SSCOP_RETRIEVE_REQ STKCMD(SAP_SSCOP, STKCMD_DOWN, 33)
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#define SSCOP_RETRIEVE_IND STKCMD(SAP_SSCOP, STKCMD_UP, 34)
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#define SSCOP_RETRIEVECMP_IND STKCMD(SAP_SSCOP, STKCMD_UP, 35)
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/* SAP_SSCF_UNI */
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#define SSCF_UNI_INIT STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, CCV_INIT)
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#define SSCF_UNI_TERM STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, CCV_TERM)
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#define SSCF_UNI_ESTABLISH_REQ STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 16)
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#define SSCF_UNI_ESTABLISH_IND STKCMD(SAP_SSCF_UNI, STKCMD_UP, 17)
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#define SSCF_UNI_ESTABLISH_CNF STKCMD(SAP_SSCF_UNI, STKCMD_UP, 18)
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#define SSCF_UNI_RELEASE_REQ STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 19)
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#define SSCF_UNI_RELEASE_IND STKCMD(SAP_SSCF_UNI, STKCMD_UP, 20)
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#define SSCF_UNI_RELEASE_CNF STKCMD(SAP_SSCF_UNI, STKCMD_UP, 21)
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#define SSCF_UNI_DATA_REQ STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 22)
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#define SSCF_UNI_DATA_IND STKCMD(SAP_SSCF_UNI, STKCMD_UP, 23)
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#define SSCF_UNI_UNITDATA_REQ STKCMD(SAP_SSCF_UNI, STKCMD_DOWN, 24)
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#define SSCF_UNI_UNITDATA_IND STKCMD(SAP_SSCF_UNI, STKCMD_UP, 25)
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/*
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* The STACK_CALL macro must be used for all stack calls between adjacent
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* entities. In order to avoid the problem with recursive stack calls
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* modifying protocol state, this macro will only allow calls to proceed if
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* they are not "against the flow" of any currently pending calls for a
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* stack instance. If the requested call can't be processed now, it will
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* be deferred and queued until a later, safe time (but before control is
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* returned back to the kernel scheduler) when it will be dispatched.
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*
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* The STACK_CALL macro arguments are:
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* cmd = command code;
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* fn = Destination entity processing function
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* tok = Destination layer's session token;
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* cvp = Connection VCC address;
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* a1 = command specific argument;
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* a2 = command specific argument;
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* ret = call result value (0 => success)
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*
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* The receiving entity command processing function prototype is:
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*
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* void (fn)(int cmd, int tok, int arg1, int arg2)
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*
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*/
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#define STACK_CALL(cmd, fn, tok, cvp, a1, a2, ret) \
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{ \
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if ((cmd) & STKCMD_UP) { \
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if ((cvp)->cvc_downcnt) { \
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(ret) = atm_stack_enq((cmd), (fn), (tok), \
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(cvp), (a1), (a2)); \
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} else { \
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(cvp)->cvc_upcnt++; \
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(*fn)(cmd, tok, a1, a2); \
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(cvp)->cvc_upcnt--; \
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(ret) = 0; \
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} \
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} else { \
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if ((cvp)->cvc_upcnt) { \
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(ret) = atm_stack_enq((cmd), (fn), (tok), \
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(cvp), (a1), (a2)); \
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} else { \
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(cvp)->cvc_downcnt++; \
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(*fn)(cmd, tok, a1, a2); \
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(cvp)->cvc_downcnt--; \
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(ret) = 0; \
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} \
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} \
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}
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/*
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* Stack queue entry - The stack queue will contain stack calls which have
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* been deferred in order to avoid recursive calls to a single protocol
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* control block. The queue entries are allocated from its own storage pool.
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*/
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struct stackq_entry {
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struct stackq_entry *sq_next; /* Next entry in queue */
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int sq_cmd; /* Stack command */
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void (*sq_func) /* Destination function */
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(int, void *, int, int);
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void *sq_token; /* Destination token */
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int sq_arg1; /* Command-specific argument */
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int sq_arg2; /* Command-specific argument */
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Atm_connvc *sq_connvc; /* Connection VCC */
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};
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/*
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* Macro to avoid unnecessary function call when draining the stack queue.
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*/
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#define STACK_DRAIN() \
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{ \
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if (atm_stackq_head) \
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atm_stack_drain(); \
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}
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#endif /* _KERNEL */
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#endif /* _NETATM_ATM_STACK_H */
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