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[dragonfly.git] / sys / netproto / atm / atm_device.c

/*
 *
 * ===================================
 * HARP  |  Host ATM Research Platform
 * ===================================
 *
 *
 * This Host ATM Research Platform ("HARP") file (the "Software") is
 * made available by Network Computing Services, Inc. ("NetworkCS")
 * "AS IS".  NetworkCS does not provide maintenance, improvements or
 * support of any kind.
 *
 * NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
 * INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
 * SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
 * In no event shall NetworkCS be responsible for any damages, including
 * but not limited to consequential damages, arising from or relating to
 * any use of the Software or related support.
 *
 * Copyright 1994-1998 Network Computing Services, Inc.
 *
 * Copies of this Software may be made, however, the above copyright
 * notice must be reproduced on all copies.
 *
 *      @(#) $FreeBSD: src/sys/netatm/atm_device.c,v 1.5 1999/08/28 00:48:35 peter Exp $
 *      @(#) $DragonFly: src/sys/netproto/atm/atm_device.c,v 1.9 2006/12/20 18:14:43 dillon Exp $
 */

/*
 * Core ATM Services
 * -----------------
 *
 * ATM device support functions
 *
 */

#include "kern_include.h"

/*
 * Private structures for managing allocated kernel memory resources
 *
 * For each allocation of kernel memory, one Mem_ent will be used.  
 * The Mem_ent structures will be allocated in blocks inside of a 
 * Mem_blk structure.
 */
#define MEM_NMEMENT     10              /* How many Mem_ent's in a Mem_blk */

struct mem_ent {
        void            *me_kaddr;      /* Allocated memory address */
        u_int           me_ksize;       /* Allocated memory length */
        void            *me_uaddr;      /* Memory address returned to caller */
        u_int           me_flags;       /* Flags (see below) */
};
typedef struct mem_ent  Mem_ent;

/*
 * Memory entry flags
 */
#define MEF_NONCACHE    1               /* Memory is noncacheable */


struct mem_blk {
        struct mem_blk  *mb_next;       /* Next block in chain */
        Mem_ent         mb_mement[MEM_NMEMENT]; /* Allocated memory entries */
};
typedef struct mem_blk  Mem_blk;

static Mem_blk          *atm_mem_head = NULL;

static struct t_atm_cause       atm_dev_cause = {
        T_ATM_ITU_CODING,
        T_ATM_LOC_USER,
        T_ATM_CAUSE_VPCI_VCI_ASSIGNMENT_FAILURE,
        {0, 0, 0, 0}
};


/*
 * ATM Device Stack Instantiation
 *
 * Called from a critical section.
 *
 * Arguments
 *      ssp             pointer to array of stack definition pointers
 *                      for connection
 *                      ssp[0] points to upper layer's stack definition
 *                      ssp[1] points to this layer's stack definition
 *                      ssp[2] points to lower layer's stack definition
 *      cvcp            pointer to connection vcc for this stack
 *
 * Returns
 *      0               instantiation successful
 *      err             instantiation failed - reason indicated
 *
 */
int
atm_dev_inst(struct stack_defn **ssp, Atm_connvc *cvcp)
{
        Cmn_unit        *cup = (Cmn_unit *)cvcp->cvc_attr.nif->nif_pif;
        Cmn_vcc         *cvp;
        int             err;

        /*
         * Check to see if device has been initialized
         */
        if ((cup->cu_flags & CUF_INITED) == 0)
                return ( EIO );

        /*
         * Validate lower SAP
         */
        /*
         * Device driver is the lowest layer - no need to validate
         */

        /*
         * Validate PVC vpi.vci
         */
        if (cvcp->cvc_attr.called.addr.address_format == T_ATM_PVC_ADDR) {
                /*
                 * Look through existing circuits - return error if found
                 */
                Atm_addr_pvc    *pp;

                pp = (Atm_addr_pvc *)cvcp->cvc_attr.called.addr.address;
                if (atm_dev_vcc_find(cup, ATM_PVC_GET_VPI(pp),
                                ATM_PVC_GET_VCI(pp), 0))
                        return ( EADDRINUSE );
        }

        /*
         * Validate our SAP type
         */
        switch ((*(ssp+1))->sd_sap) {
        case SAP_CPCS_AAL3_4:
        case SAP_CPCS_AAL5:
        case SAP_ATM:
                break;
        default:
                return (EINVAL);
        }

        /*
         * Allocate a VCC control block
         */
        if ( ( cvp = (Cmn_vcc *)atm_allocate(cup->cu_vcc_pool) ) == NULL )
                return ( ENOMEM );
        
        cvp->cv_state = CVS_INST;
        cvp->cv_toku = (*ssp)->sd_toku;
        cvp->cv_upper = (*ssp)->sd_upper;
        cvp->cv_connvc = cvcp;

        /*
         * Let device have a look at the connection request
         */
        err = (*cup->cu_instvcc)(cup, cvp);
        if (err) {
                atm_free((caddr_t)cvp);
                return (err);
        }

        /*
         * Looks good so far, so link in device VCC
         */
        LINK2TAIL ( cvp, Cmn_vcc, cup->cu_vcc, cv_next );

        /*
         * Save my token
         */
        (*++ssp)->sd_toku = cvp;

        /*
         * Pass instantiation down the stack
         */
        /*
         * No need - we're the lowest point.
         */
        /* err = (*(ssp + 1))->sd_inst(ssp, cvcp); */

        /*
         * Save the lower layer's interface info
         */
        /*
         * No need - we're the lowest point
         */
        /* cvp->cv_lower = (*++ssp)->sd_lower; */
        /* cvp->cv_tok1 = (*ssp)->sd_toku; */

        return (0);
}


/*
 * ATM Device Stack Command Handler
 *
 * Arguments
 *      cmd             stack command code
 *      tok             session token (Cmn_vcc)
 *      arg1            command specific argument
 *      arg2            command specific argument
 *
 * Returns
 *      none
 *
 */
/*ARGSUSED*/
void
atm_dev_lower(int cmd, void *tok, int arg1, int arg2)
{
        Cmn_vcc         *cvp = (Cmn_vcc *)tok;
        Atm_connvc      *cvcp = cvp->cv_connvc;
        Cmn_unit        *cup = (Cmn_unit *)cvcp->cvc_attr.nif->nif_pif;
        struct vccb     *vcp;
        u_int           state;

        switch ( cmd ) {

        case CPCS_INIT:
                /*
                 * Sanity check
                 */
                if ( cvp->cv_state != CVS_INST ) {
                        log ( LOG_ERR,
                                "atm_dev_lower: INIT: tok=%p, state=%d\n",
                                tok, cvp->cv_state );
                        break;
                }

                vcp = cvp->cv_connvc->cvc_vcc;

                /*
                 * Validate SVC vpi.vci
                 */
                if ( vcp->vc_type & VCC_SVC ) {

                        if (atm_dev_vcc_find(cup, vcp->vc_vpi, vcp->vc_vci,
                                        vcp->vc_type & (VCC_IN | VCC_OUT))
                                                != cvp){
                                log ( LOG_ERR,
                                  "atm_dev_lower: dup SVC (%d,%d) tok=%p\n",
                                        vcp->vc_vpi, vcp->vc_vci, tok );
                                atm_cm_abort(cvp->cv_connvc, &atm_dev_cause);
                                break;
                        }
                }

                /*
                 * Tell the device to open the VCC
                 */
                cvp->cv_state = CVS_INITED;
                crit_enter();
                if ((*cup->cu_openvcc)(cup, cvp)) {
                        atm_cm_abort(cvp->cv_connvc, &atm_dev_cause);
                        crit_exit();
                        break;
                }
                crit_exit();
                break;

        case CPCS_TERM: {
                KBuffer         *m, *prev, *next;
                int             *ip;

                crit_enter();

                /*
                 * Disconnect the VCC - ignore return code
                 */
                if ((cvp->cv_state == CVS_INITED) || 
                    (cvp->cv_state == CVS_ACTIVE)) {
                        (*cup->cu_closevcc)(cup, cvp);
                }
                cvp->cv_state = CVS_TERM;

                /*
                 * Remove from interface list
                 */
                UNLINK ( cvp, Cmn_vcc, cup->cu_vcc, cv_next );

                /*
                 * Free any buffers from this VCC on the ATM interrupt queue
                 */
                prev = NULL;
                for (m = atm_intrq.ifq_head; m; m = next) {
                        next = KB_QNEXT(m);

                        /*
                         * See if this entry is for the terminating VCC
                         */
                        KB_DATASTART(m, ip, int *);
                        ip++;
                        if (*ip == (int)cvp) {
                                /*
                                 * Yep, so dequeue the entry
                                 */
                                if (prev == NULL)
                                        atm_intrq.ifq_head = next;
                                else
                                        KB_QNEXT(prev) = next;

                                if (next == NULL)
                                        atm_intrq.ifq_tail = prev;

                                atm_intrq.ifq_len--;

                                /*
                                 * Free the unwanted buffers
                                 */
                                KB_FREEALL(m);
                        } else {
                                prev = m;
                        }
                }
                crit_exit();

                /*
                 * Free VCC resources
                 */
                atm_free((caddr_t)cvp);
                break;
                }

        case CPCS_UNITDATA_INV:

                /*
                 * Sanity check
                 *
                 * Use temp state variable since we dont want to lock out
                 * interrupts, but initial VC activation interrupt may
                 * happen here, changing state somewhere in the middle.
                 */
                state = cvp->cv_state;
                if ((state != CVS_ACTIVE) && 
                    (state != CVS_INITED)) {
                        log ( LOG_ERR,
                            "atm_dev_lower: UNITDATA: tok=%p, state=%d\n",
                                tok, state );
                        KB_FREEALL((KBuffer *)arg1);
                        break;
                }

                /*
                 * Hand the data off to the device
                 */
                (*cup->cu_output)(cup, cvp, (KBuffer *)arg1);

                break;

        case CPCS_UABORT_INV:
                log ( LOG_ERR,
                    "atm_dev_lower: unimplemented stack cmd 0x%x, tok=%p\n",
                        cmd, tok );
                break;

        default:
                log ( LOG_ERR,
                        "atm_dev_lower: unknown stack cmd 0x%x, tok=%p\n",
                        cmd, tok );

        }

        return;
}



/*
 * Allocate kernel memory block
 * 
 * This function will allocate a kernel memory block of the type specified
 * in the flags parameter.  The returned address will point to a memory
 * block of the requested size and alignment.  The memory block will also 
 * be zeroed.  The alloc/free functions will manage/mask both the OS-specific 
 * kernel memory management requirements and the bookkeeping required to
 * deal with data alignment issues. 
 *
 * This function should not be called from interrupt level.
 *
 * Arguments:
 *      size    size of memory block to allocate
 *      align   data alignment requirement 
 *      flags   allocation flags (ATM_DEV_*)
 *
 * Returns:
 *      uaddr   pointer to aligned memory block
 *      NULL    unable to allocate memory
 *
 */
void *         
atm_dev_alloc(u_int size, u_int align, u_int flags)
{
        Mem_blk         *mbp;
        Mem_ent         *mep;
        u_int           kalign, ksize;
        int             i;

        crit_enter();

        /*
         * Find a free Mem_ent
         */
        mep = NULL;
        for (mbp = atm_mem_head; mbp && mep == NULL; mbp = mbp->mb_next) {
                for (i = 0; i < MEM_NMEMENT; i++) {
                        if (mbp->mb_mement[i].me_uaddr == NULL) {
                                mep = &mbp->mb_mement[i];
                                break;
                        }
                }
        }

        /*
         * If there are no free Mem_ent's, then allocate a new Mem_blk
         * and link it into the chain
         */
        if (mep == NULL) {
                mbp = KM_ALLOC(sizeof(Mem_blk), M_DEVBUF, 
                                M_INTWAIT | M_NULLOK);
                if (mbp == NULL) {
                        log(LOG_ERR, "atm_dev_alloc: Mem_blk failure\n");
                        crit_exit();
                        return (NULL);
                }
                KM_ZERO(mbp, sizeof(Mem_blk));

                mbp->mb_next = atm_mem_head;
                atm_mem_head = mbp;
                mep = mbp->mb_mement;
        }

        /*
         * Now we need to get the kernel's allocation alignment minimum
         *
         * This is obviously very OS-specific stuff
         */
        kalign = MINALLOCSIZE;

        /*
         * Figure out how much memory we must allocate to satify the
         * user's size and alignment needs
         */
        if (align <= kalign)
                ksize = size;
        else
                ksize = size + align - kalign;

        /*
         * Finally, go get the memory
         */
        if (flags & ATM_DEV_NONCACHE) {
                mep->me_kaddr = KM_ALLOC(ksize, M_DEVBUF, M_INTWAIT | M_NULLOK);
        } else {
                mep->me_kaddr = KM_ALLOC(ksize, M_DEVBUF, M_INTWAIT | M_NULLOK);
        }

        if (mep->me_kaddr == NULL) {
                log(LOG_ERR, "atm_dev_alloc: %skernel memory unavailable\n",
                        (flags & ATM_DEV_NONCACHE) ? "non-cacheable " : "");
                crit_exit();
                return (NULL);
        }

        /*
         * Calculate correct alignment address to pass back to user
         */
        mep->me_uaddr = (void *) roundup((u_int)mep->me_kaddr, align);
        mep->me_ksize = ksize;
        mep->me_flags = flags;

        /*
         * Clear memory for user
         */
        KM_ZERO(mep->me_uaddr, size);

        ATM_DEBUG4("atm_dev_alloc: size=%d, align=%d, flags=%d, uaddr=%p\n", 
                size, align, flags, mep->me_uaddr);

        crit_exit();

        return (mep->me_uaddr);
}


/*
 * Free kernel memory block
 * 
 * This function will free a kernel memory block previously allocated by
 * the atm_dev_alloc function.  
 *
 * This function should not be called from interrupt level.
 *
 * Arguments:
 *      uaddr   pointer to allocated aligned memory block
 *
 * Returns:
 *      none
 *
 */
void
atm_dev_free(volatile void *uaddr)
{
        Mem_blk         *mbp;
        Mem_ent         *mep;
        int             i;

        ATM_DEBUG1("atm_dev_free: uaddr=%p\n", uaddr);

        crit_enter();

        /*
         * Protect ourselves...
         */
        if (uaddr == NULL)
                panic("atm_dev_free: trying to free null address");

        /*
         * Find our associated entry
         */
        mep = NULL;
        for (mbp = atm_mem_head; mbp && mep == NULL; mbp = mbp->mb_next) {
                for (i = 0; i < MEM_NMEMENT; i++) {
                        if (mbp->mb_mement[i].me_uaddr == uaddr) {
                                mep = &mbp->mb_mement[i];
                                break;
                        }
                }
        }

        /*
         * If we didn't find our entry, then unceremoniously let the caller
         * know they screwed up (it certainly couldn't be a bug here...)
         */
        if (mep == NULL)
                panic("atm_dev_free: trying to free unknown address");
        
        /*
         * Give the memory space back to the kernel
         */
        if (mep->me_flags & ATM_DEV_NONCACHE) {
                KM_FREE(mep->me_kaddr, mep->me_ksize, M_DEVBUF);
        } else {
                KM_FREE(mep->me_kaddr, mep->me_ksize, M_DEVBUF);
        }

        /*
         * Free our entry
         */
        mep->me_uaddr = NULL;

        crit_exit();

        return;
}

/*
 * Compress buffer chain
 * 
 * This function will compress a supplied buffer chain into a minimum number
 * of kernel buffers.  Typically, this function will be used because the
 * number of buffers in an output buffer chain is too large for a device's
 * DMA capabilities.  This should only be called as a last resort, since
 * all the data copying will surely kill any hopes of decent performance.
 *
 * Arguments:
 *      m       pointer to source buffer chain
 *
 * Returns:
 *      n       pointer to compressed buffer chain
 *
 */
KBuffer *         
atm_dev_compress(KBuffer *m)
{
        KBuffer         *n, *n0, **np;
        int             len, space;
        caddr_t         src, dst;

        n = n0 = NULL;
        np = &n0;
        dst = NULL;
        space = 0;

        /*
         * Copy each source buffer into compressed chain
         */
        while (m) {

                if (space == 0) {

                        /*
                         * Allocate another buffer for compressed chain
                         */
                        KB_ALLOCEXT(n, ATM_DEV_CMPR_LG, KB_F_NOWAIT, KB_T_DATA);
                        if (n) {
                                space = ATM_DEV_CMPR_LG;
                        } else {
                                KB_ALLOC(n, ATM_DEV_CMPR_SM, KB_F_NOWAIT, 
                                        KB_T_DATA);
                                if (n) {
                                        space = ATM_DEV_CMPR_SM;
                                } else {
                                        /*
                                         * Unable to get any new buffers, so
                                         * just return the partially compressed
                                         * chain and hope...
                                         */
                                        *np = m;
                                        break;
                                }
                        }

                        KB_HEADSET(n, 0);
                        KB_LEN(n) = 0;
                        KB_BFRSTART(n, dst, caddr_t);

                        *np = n;
                        np = &KB_NEXT(n);
                }

                /*
                 * Copy what we can from source buffer
                 */
                len = MIN(space, KB_LEN(m));
                KB_DATASTART(m, src, caddr_t);
                KM_COPY(src, dst, len);

                /*
                 * Adjust for copied data
                 */
                dst += len;
                space -= len;

                KB_HEADADJ(m, -len);
                KB_TAILADJ(n, len);

                /*
                 * If we've exhausted our current source buffer, free it
                 * and move to the next one
                 */
                if (KB_LEN(m) == 0) {
                        KB_FREEONE(m, m);
                }
        }

        return (n0);
}


/*
 * Locate VCC entry
 * 
 * This function will return the VCC entry for a specified interface and
 * VPI/VCI value.
 *
 * Arguments:
 *      cup     pointer to interface unit structure
 *      vpi     VPI value
 *      vci     VCI value
 *      type    VCC type
 *
 * Returns:
 *      vcp     pointer to located VCC entry matching
 *      NULL    no VCC found
 *
 */
Cmn_vcc *
atm_dev_vcc_find(Cmn_unit *cup, u_int vpi, u_int vci, u_int type)
{
        Cmn_vcc         *cvp;

        crit_enter();
        /*
         * Go find VCC
         *
         * (Probably should stick in a hash table some time)
         */
        for (cvp = cup->cu_vcc; cvp; cvp = cvp->cv_next) {
                struct vccb     *vcp;

                vcp = cvp->cv_connvc->cvc_vcc;
                if ((vcp->vc_vci == vci) && (vcp->vc_vpi == vpi) && 
                    ((vcp->vc_type & type) == type))
                        break;
        }
        crit_exit();
        return (cvp);
}


#ifdef notdef
/*
 * Module unloading notification
 * 
 * This function must be called just prior to unloading the module from 
 * memory.  All allocated memory will be freed here and anything else that
 * needs cleaning up.
 *
 * Arguments:
 *      none
 *
 * Returns:
 *      none
 *
 */
void
atm_unload(void)
{
        Mem_blk         *mbp;
        Mem_ent         *mep;
        int             i;

        crit_enter();

        /*
         * Free up all of our memory management storage
         */
        while (mbp = atm_mem_head) {

                /*
                 * Make sure users have freed up all of their memory
                 */
                for (i = 0; i < MEM_NMEMENT; i++) {
                        if (mbp->mb_mement[i].me_uaddr != NULL) {
                                panic("atm_unload: unfreed memory");
                        }
                }

                atm_mem_head = mbp->mb_next;

                /*
                 * Hand this block back to the kernel
                 */
                KM_FREE((caddr_t) mbp, sizeof(Mem_blk), M_DEVBUF);
        }

        crit_exit();

        return;
}
#endif  /* notdef */


/*
 * Print a PDU
 * 
 * Arguments:
 *      cup     pointer to device unit
 *      cvp     pointer to VCC control block
 *      m       pointer to pdu buffer chain
 *      msg     pointer to message string
 *
 * Returns:
 *      none
 *
 */
void
atm_dev_pdu_print(Cmn_unit *cup, Cmn_vcc *cvp, KBuffer *m, char *msg)
{
        char            buf[128];

        ksnprintf(buf, sizeof(buf), "%s vcc=(%d,%d)", msg, 
                cvp->cv_connvc->cvc_vcc->vc_vpi, 
                cvp->cv_connvc->cvc_vcc->vc_vci);

        atm_pdu_print(m, buf);
}