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284 lines
6.4 KiB
C
284 lines
6.4 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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* @(#) $Id: eni_vcm.c,v 1.1 1998/09/15 08:22:54 phk Exp $
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*
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*/
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/*
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* Efficient ENI Adapter Support
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* -----------------------------
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*
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* Virtual Channel Managment
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*
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*/
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#include <netatm/kern_include.h>
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#include <dev/hea/eni_stats.h>
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#include <dev/hea/eni.h>
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#include <dev/hea/eni_var.h>
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#ifndef lint
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__RCSID("@(#) $Id: eni_vcm.c,v 1.1 1998/09/15 08:22:54 phk Exp $");
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#endif
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/*
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* VCC Stack Instantiation
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*
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* This function is called via the common driver code during a device VCC
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* stack instantiation. The common code has already validated some of
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* the request so we just need to check a few more ENI-specific details.
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*
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* Called at splnet.
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*
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* Arguments:
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* cup pointer to device common unit
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* cvp pointer to common VCC entry
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*
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* Returns:
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* 0 instantiation successful
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* err instantiation failed - reason indicated
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*
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*/
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int
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eni_instvcc(cup, cvp)
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Cmn_unit *cup;
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Cmn_vcc *cvp;
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{
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Eni_unit *eup = (Eni_unit *)cup;
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Eni_vcc *evp = (Eni_vcc *)cvp;
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Atm_attributes *ap = &evp->ev_connvc->cvc_attr;
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/*
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* Validate requested AAL
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*/
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switch (ap->aal.type) {
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case ATM_AAL0:
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break;
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case ATM_AAL5:
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if ((ap->aal.v.aal5.forward_max_SDU_size > ENI_IFF_MTU) ||
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(ap->aal.v.aal5.backward_max_SDU_size > ENI_IFF_MTU)) {
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eup->eu_stats.eni_st_drv.drv_vc_maxpdu++;
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return (EINVAL);
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}
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break;
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default:
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return (EINVAL);
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}
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return (0);
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}
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/*
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* Open a VCC
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*
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* This function is called via the common driver code after receiving a
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* stack *_INIT* command. The common code has already validated most of
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* the request so we just need to check a few more ENI-specific details.
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*
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* Called at splimp.
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*
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* Arguments:
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* cup pointer to device common unit
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* cvp pointer to common VCC entry
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*
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* Returns:
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* 0 open sucessful
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* err open failed
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*
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*/
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int
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eni_openvcc ( cup, cvp )
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Cmn_unit *cup;
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Cmn_vcc *cvp;
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{
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Eni_unit *eup = (Eni_unit *)cup;
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Eni_vcc *evp = (Eni_vcc *)cvp;
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struct vccb *vcp = evp->ev_connvc->cvc_vcc;
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int err = 0;
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VCI_Table *vct;
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int size;
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int mode;
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int nsize;
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/*
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* Validate the VPI and VCI values
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*/
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if ( (vcp->vc_vpi > eup->eu_pif.pif_maxvpi) ||
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(vcp->vc_vci > eup->eu_pif.pif_maxvci) ) {
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eup->eu_stats.eni_st_drv.drv_vc_badrng++;
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return ( EFAULT );
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}
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/*
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* Check if this VCI is already active
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*/
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vct = &eup->eu_vcitbl[ vcp->vc_vci ];
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if ( vct->vci_control >> VCI_MODE_SHIFT != VCI_MODE_TRASH ) {
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return ( EEXIST );
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}
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/*
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* Allocate some permanent adapter memory for the reassembly
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* buffer. Special case the signalling channel(s) buffer size.
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* Otherwise, the buffer size will be based on whether this is
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* a server or client card.
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*/
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if ( vcp->vc_vci == UNI_SIG_VCI ) /* HACK */
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size = RX_SIG_BSIZE;
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else
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size = (eup->eu_ramsize > MAX_CLIENT_RAM * ENI_BUF_PGSZ) ?
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RX_SERVER_BSIZE * ENI_BUF_PGSZ :
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RX_CLIENT_BSIZE * ENI_BUF_PGSZ;
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if ( ( evp->ev_rxbuf = eni_allocate_buffer ( eup, (u_long *)&size ) )
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== (caddr_t)NULL ) {
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return ( ENOMEM );
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}
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evp->ev_rxpos = 0;
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/*
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* We only need to open incoming VCI's so outbound VCI's
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* just get set to CVS_ACTIVE state.
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*/
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if ( ( vcp->vc_type & VCC_IN ) == 0 ) {
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/*
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* Set the state and return - nothing else needs to be done.
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*/
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evp->ev_state = CVS_ACTIVE;
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return ( 0 );
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}
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/*
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* Set the VCI Table entry to start receiving
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*/
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mode = ( evp->ev_connvc->cvc_attr.aal.type == ATM_AAL5
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? VCI_MODE_AAL5 : VCI_MODE_AAL0 );
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size >>= ENI_LOC_PREDIV; /* Predivide by 256 WORDS */
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for ( nsize = -1; size; nsize++ )
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size >>= 1;
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vct->vci_control = mode << VCI_MODE_SHIFT |
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PTI_MODE_TRASH << VCI_PTI_SHIFT |
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( (u_int)(evp->ev_rxbuf) >> ENI_LOC_PREDIV ) << VCI_LOC_SHIFT |
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nsize << VCI_SIZE_SHIFT;
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vct->vci_descr = 0; /* Descr = Rdptr = 0 */
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vct->vci_write = 0; /* WritePtr = CellCount = 0 */
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/*
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* Indicate VC active
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*/
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evp->ev_state = CVS_ACTIVE;
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return ( err );
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}
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/*
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* Close a VCC
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*
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* This function is called via the common driver code after receiving a
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* stack *_TERM* command. The common code has already validated most of
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* the request so we just need to check a few more ENI-specific details.
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*
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* Called at splimp.
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*
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* Arguments:
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* cup pointer to device common unit
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* cvp pointer to common VCC entry
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*
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* Returns:
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* 0 close sucessful
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* err close failed
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*
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*/
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int
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eni_closevcc ( cup, cvp )
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Cmn_unit *cup;
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Cmn_vcc *cvp;
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{
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Eni_unit *eup = (Eni_unit *)cup;
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Eni_vcc *evp = (Eni_vcc *)cvp;
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struct vccb *vcp = evp->ev_connvc->cvc_vcc;
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int err = 0;
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VCI_Table *vct;
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/*
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* Clear any references to this VCC in our transmit queue
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*/
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/*
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* We'll simply allow any existing TX requests to be
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* sent as that's easier then pulling them out of
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* everywhere. Besides, they should be ignored at the
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* receiver whenever the other end shuts down.
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*/
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/*
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* Free the adapter receive buffer
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*/
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(void) eni_free_buffer ( eup, (caddr_t)evp->ev_rxbuf );
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/*
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* If this is an outbound only VCI, then we can close
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* immediately.
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*/
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if ( ( vcp->vc_type & VCC_IN ) == 0 ) {
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/*
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* The state will be set to TERM when we return
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* to the *_TERM caller.
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*/
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return ( 0 );
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}
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/*
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* Find VCI entry in VCI Table
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*/
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vct = &eup->eu_vcitbl[ vcp->vc_vci ];
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/*
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* Reset the VCI state
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*/
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vct->vci_control = ( vct->vci_control & VCI_MODE_MASK )
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/* | VCI_MODE_TRASH */;
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DELAY ( MIDWAY_DELAY ); /* Give the adapter time to */
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/* make the transition */
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/*
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* Reset everything
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*/
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KM_ZERO ( (caddr_t)vct, sizeof(VCI_Table) );
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return ( err );
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}
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