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df5e198723
before adding/removing packets from the queue. Also, the if_obytes and if_omcasts fields should only be manipulated under protection of the mutex. IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on the queue. An IF_LOCK macro is provided, as well as the old (mutex-less) versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which needs them, but their use is discouraged. Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF, which takes care of locking/enqueue, and also statistics updating/start if necessary.
889 lines
22 KiB
C
889 lines
22 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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* Efficient ENI Adapter Support
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* -----------------------------
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*
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* Receive management
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <netinet/in.h>
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#include <netatm/port.h>
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#include <netatm/queue.h>
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#include <netatm/atm.h>
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#include <netatm/atm_sys.h>
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#include <netatm/atm_sap.h>
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#include <netatm/atm_cm.h>
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#include <netatm/atm_if.h>
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#include <netatm/atm_vc.h>
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#include <netatm/atm_stack.h>
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#include <netatm/atm_pcb.h>
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#include <netatm/atm_var.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("@(#) $FreeBSD$");
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#endif
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static void eni_recv_stack __P((void *, KBuffer *));
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#ifdef DIAGNOSTIC
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extern int eni_pdu_print;
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#endif
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/*
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* Procedure to remove VCs from the Service List and generate DMA
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* requests to move the associated PDUs into host memory. As PDUs
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* are completed in adapter memory, the adapter examines the IN_SERVICE
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* bit for the VC in the VC table. If this bit is not set, the adapter
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* will place the VC number at the end of the service list queue, set
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* the IN_SERVICE bit in the VC table, and interrupt the host. The host
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* will remove VCs from the service list, clear the IN_SERVICE bit in
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* the VC table, and create a DMA list to move the PDU into host buffers.
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*
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* Arguments:
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* eup pointer to per unit structure
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*
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* Returns:
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* none
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*
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*/
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void
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eni_do_service ( eup )
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Eni_unit *eup;
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{
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int vcc;
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Eni_vcc *evp;
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u_long servwrite;
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VCI_Table *vct;
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u_long rdptr;
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u_long *rxp;
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KBuffer *m;
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u_long dma[TEMP_DMA_SIZE];
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u_long i, j;
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u_long dma_rd, dma_wr;
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u_long dma_avail;
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int pdulen;
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int mask;
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u_long *upp;
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/*
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* Where is the adapter currently inserting entries?
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*/
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servwrite = eup->eu_midway[MIDWAY_SVCWR] & SVC_SIZE_MASK;
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/*
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* As long as we're not caught up with the adapter, keep
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* removing VCs from the service list.
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*/
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while ( servwrite != eup->eu_servread ) {
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int vci_hdr;
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u_long descr;
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/*
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* Get VC number and find VC table entry.
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*/
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vcc = eup->eu_svclist[eup->eu_servread];
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vct = &eup->eu_vcitbl[vcc];
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vci_hdr = vct->vci_control; /* Current status */
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/*
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* Check that this VCC still needs servicing. We
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* might have closed this VCC down in between
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* the adapter setting the flag and our checking
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* the flag. Also check that we haven't placed the
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* VCC into TRASH mode.
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*/
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if ( ( vci_hdr & VCI_IN_SERVICE ) == 0 ||
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( (vci_hdr & ~VCI_MODE_MASK) ==
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(VCI_MODE_TRASH << VCI_MODE_SHIFT) ) )
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goto next_vcc;
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/*
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* Find the size of this VCs buffer
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*/
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mask = (vci_hdr >> VCI_SIZE_SHIFT) & VCI_SIZE_MASK;
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mask = 1 << (ENI_LOC_PREDIV + mask);
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/* Turn byte count into word count */
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mask >>= 2;
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/*
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* Find the start of the adapter buffer for this VC.
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*/
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rxp = (u_long *)
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((int)(((vci_hdr >> VCI_LOC_SHIFT ) & VCI_LOC_MASK)
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<< ENI_LOC_PREDIV) + (int)eup->eu_ram);
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/*
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* Locate incoming VCC for this PDU and find where we
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* should next read from.
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*/
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evp = (Eni_vcc *) atm_dev_vcc_find ( (Cmn_unit *)eup,
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0, vcc, VCC_IN );
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if ( evp == (Eni_vcc *)NULL )
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goto next_vcc; /* VCI no longer active */
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rdptr = evp->ev_rxpos;
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/*
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* Find out where the adapter is currently reassembling.
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* The PDU which starts at descr is not yet complete so we
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* must stop there.
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*/
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descr = ( vct->vci_descr >> 16 ) & 0x7FFF;
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/*
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* As long as we haven't processed all the completed PDUs on
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* this VC, keep going...
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*/
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while ( rdptr != descr )
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{
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int n_cells;
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int pdu_descr;
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int aal5;
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/*
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* Ensure that the following are reset for every new
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* PDU.
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*/
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upp = NULL;
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m = NULL;
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/*
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* Fisrt build a DMA with JK to skip the descriptor word.
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* We must always skip the descriptor even if it turns out
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* that there isn't any PDU here.
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*/
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j = 0;
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dma[j++] = (((rdptr + 1) & (mask-1)) << DMA_COUNT_SHIFT ) |
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( vcc << DMA_VCC_SHIFT ) | DMA_JK;
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dma[j++] = 0;
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/*
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* We'll use some of the values below for skipping
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* bad PDUs or counting statistics so compute them
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* now.
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*/
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/*
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* Grab a copy of the descriptor word
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*/
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pdu_descr = rxp[rdptr];
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/*
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* Strip out cell count from descriptor word.
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* At this point, we still don't know if there
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* is any real data until after we check for
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* TRASH mode.
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*/
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n_cells = pdu_descr & DESCR_CELL_COUNT;
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/*
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* Is this an AAL5 PDU? Check MODE in vci_hdr.
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*/
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aal5 = ( ( vci_hdr & ~VCI_MODE_MASK ) ==
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VCI_MODE_AAL5 << VCI_MODE_SHIFT );
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/*
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* Now check to see if we're trashing on this vcc.
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* If so, there is no data with this VC and the
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* next word after the current descriptor is the
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* descriptor for the next PDU.
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*/
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if ( ( pdu_descr & DESCR_TRASH_BIT ) != 0 ) {
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if ( aal5 )
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/*
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* Count as number of AAL5 cells dropped
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*/
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eup->eu_stats.eni_st_aal5.aal5_drops += n_cells;
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else
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/*
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* Count as number of AAL0 cells dropped
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*/
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eup->eu_stats.eni_st_aal0.aal0_drops += n_cells;
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eup->eu_pif.pif_ierrors++;
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/*
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* When cells have been trashed, all we have in the
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* buffer is a descriptor word. There are no data
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* words. Set the number of cells to zero so that
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* we correctly skip to the next word which will
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* be the descriptor for the next PDU.
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*/
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n_cells = 0;
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/*
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* Go issue the DMA to skip this descriptor word.
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*/
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goto send_dma;
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}
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/*
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* Data length: number of cells * cell size
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*/
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pdulen = n_cells * BYTES_PER_CELL;
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/*
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* If this is an AAL5 PDU, then we need to check
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* for the presence of any CRC errors. If there
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* is one or more CRC errors, then we are going to
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* drop this PDU.
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*/
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if ( aal5 && ( pdu_descr & DESCR_CRC_ERR ) ) {
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/*
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* Count the stat
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*/
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eup->eu_pif.pif_ierrors++;
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eup->eu_stats.eni_st_aal5.aal5_pdu_crc++;
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if ( evp->ev_connvc->cvc_vcc )
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evp->ev_connvc->cvc_vcc->vc_ierrors++;
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/*
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* Build a DMA entry to skip the rest of this
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* PDU.
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*/
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dma[j++] =
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(((rdptr + n_cells*WORDS_PER_CELL + 1)
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& (mask-1)) << DMA_COUNT_SHIFT ) |
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(vcc << DMA_VCC_SHIFT ) | DMA_JK;
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dma[j++] = 0;
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/*
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* All done with this PDU. Get a buffer to save some
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* data for reclamation services.
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*/
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KB_ALLOCPKT ( m, ENI_SMALL_BSIZE, KB_F_NOWAIT,
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KB_T_DATA );
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if ( m ) {
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u_long *up;
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KB_DATASTART ( m, up, u_long * );
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/*
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* Indicate no PDU
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*/
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KB_PLENSET ( m, 0 );
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/*
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* Set buffer length - only driver overhead
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*/
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KB_LEN ( m ) = 3 * sizeof ( u_long );
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/*
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* Insert vcc, space for DMA pointers,
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* and pdulen
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*/
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*up++ = vcc;
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upp = up; /* Remember location */
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up++; /* And skip it */
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/* - to be filled later */
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*up = pdulen; /* Actual PDU length if it */
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/* were valid */
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} else {
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/*
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* We've a real problem here as now we can't
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* reclaim/advance resources/safety pointers.
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*/
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eup->eu_stats.eni_st_drv.drv_rv_norsc++;
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#ifdef DO_LOG
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log ( LOG_ERR,
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"eni_do_service: No drain buffers available. Receiver about to lock.\n" );
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#endif
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}
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goto send_dma;
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}
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/*
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* Do we need to strip the AAL layer? Yes if this
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* is an AAL5 PDU.
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*/
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if ( aal5 ) {
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/*
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* Grab the CS-PDU length. Find the address of the
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* last word, back up one word to skip CRC, and
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* then mask the whole thing to handle circular wraps.
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*/
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pdulen = rxp[(rdptr + n_cells*WORDS_PER_CELL - 1)
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& (mask-1)]
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& 0xFFFF;
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}
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/*
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* We now have a valid PDU of some length. Build
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* the necessary DMA list to move it into host
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* memory.
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*/
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/*
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* Get an initial buffer.
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*/
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KB_ALLOCPKT ( m, ENI_SMALL_BSIZE, KB_F_NOWAIT, KB_T_DATA );
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/*
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* Do we have a valid buffer?
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*/
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if ( m != (KBuffer *)NULL )
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{
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int len;
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u_long *up;
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KBuffer *m0;
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KB_DATASTART ( m, up, u_long * );
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/*
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* Fill in pdulen in PKTHDR structure (for IP).
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*/
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KB_PLENSET ( m, pdulen );
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/*
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* We're going to save the VCI nuber, the start
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* and stop DMA pointers, and the PDU length at
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* the head of the buffer. We'll pull this out
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* later after the DMA has completed.
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*
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* Insert VCI number as first word in first buffer,
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* remeber where we want to store the start/stop
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* pointers, and store the PDU length.
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*/
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*up++ = vcc; /* PDU's VCC */
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upp = up; /* Remember where we are */
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up++; /* To stuff start/stop pointers in */
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*up++ = pdulen; /* PDU's length */
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/*
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* Leave some extra room in case a higher protocol
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* (IP) wants to do a pullup. Maybe we can keep
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* someone from having to allocate another buffer
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* a do a larger memory copy.
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*/
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len = MIN ( ENI_SMALL_BSIZE, pdulen );
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(void) eni_set_dma ( eup, 1, dma, TEMP_DMA_SIZE, &j,
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vcc, (u_long)up, len );
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/*
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* Adjust length of remaining data in PDU
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*/
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pdulen -= len;
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/*
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* Set buffer length, including our overhead
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*/
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KB_LEN ( m ) = len + 3 * sizeof ( u_long );
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/*
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* Finish by moving anything which won't fit in
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* first buffer
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*/
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m0 = m;
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while ( pdulen ) {
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KBuffer *m1;
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u_long data_addr;
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/*
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* Get another buffer
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*/
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KB_ALLOCEXT ( m1, ENI_LARGE_BSIZE, KB_F_NOWAIT,
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KB_T_DATA );
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/*
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* If we succeeded...
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*/
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if ( m1 ) {
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/*
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* Figure out how much we can move into
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* this buffer.
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*/
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len = MIN ( ENI_LARGE_BSIZE, pdulen );
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/*
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* Setup DMA list for this buffer
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*/
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KB_DATASTART ( m1, data_addr, u_long );
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(void) eni_set_dma
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( eup, 1, dma, TEMP_DMA_SIZE, &j, vcc,
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data_addr, len );
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/*
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* Adjust remaining length
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*/
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pdulen -= len;
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/*
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* Set buffer length
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*/
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KB_LEN ( m1 ) = len;
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/*
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* Link new buffer onto end and advance
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* pointer
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*/
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KB_NEXT ( m0 ) = m1;
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m0 = m1;
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} else {
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/*
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* Either we were unable to grab another
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* buffer or there are no large buffers
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* available. We know that the first
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* buffer is valid, so drop everything
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* else, build a JK DMA to skip/drop this
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* PDU, set the pointers to reclaim
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* resources/advance pointers, and
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* finish this PDU now.
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*/
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if ( KB_NEXT ( m ) )
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KB_FREEALL ( KB_NEXT ( m ) );
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eup->eu_pif.pif_ierrors++;
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j = 2;
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dma[j++] =
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(((rdptr + n_cells*WORDS_PER_CELL + 1)
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& (mask-1)) << DMA_COUNT_SHIFT ) |
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(vcc << DMA_VCC_SHIFT ) |
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DMA_JK;
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dma[j++] = 0;
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/*
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* Reset PDU length to zero
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*/
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KB_PLENSET ( m, 0 );
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/*
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* Count some statistics
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*/
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/*
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* Count this as dropped cells
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*/
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if ( aal5 ) {
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eup->eu_stats.eni_st_aal5.aal5_drops +=
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n_cells;
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eup->eu_stats.eni_st_aal5.aal5_pdu_drops++;
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} else
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eup->eu_stats.eni_st_aal0.aal0_drops +=
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n_cells;
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/*
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* Drop it
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*/
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goto send_dma;
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}
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}
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/*
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* If necessary, skip AAL layer
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*/
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if ( aal5 ) {
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dma[j++] =
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(((rdptr + n_cells*WORDS_PER_CELL + 1)
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& (mask-1)) << DMA_COUNT_SHIFT)
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| (vcc << DMA_VCC_SHIFT) | DMA_JK;
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dma[j++] = 0;
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}
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} else {
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/*
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* We failed to get an initial buffer. Since we
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* haven't changed anything for this PDU yet and the
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* PDU is still valid, exit now and try to service it
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* next time around. We're not very likely to get
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* another buffer right now anyways.
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*/
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eup->eu_stats.eni_st_drv.drv_rv_nobufs++;
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#ifdef DO_LOG
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log ( LOG_ERR,
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"eni_do_service: No buffers available. Exiting without servicing service list.\n" );
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#endif
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/*
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* Clear the IN_SERVICE indicator for this VCC
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*/
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vct->vci_control &= ~VCI_IN_SERVICE;
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return;
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}
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send_dma:
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/*
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* Set the end bit on the last DMA for this PDU
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*/
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dma[j-2] |= DMA_END_BIT;
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/*
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* Where are the current DMA pointers
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*/
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dma_rd = eup->eu_midway[MIDWAY_RX_RD];
|
|
dma_wr = eup->eu_midway[MIDWAY_RX_WR];
|
|
|
|
/*
|
|
* Check how much space is available
|
|
*/
|
|
if ( dma_rd == dma_wr )
|
|
dma_avail = DMA_LIST_SIZE;
|
|
else
|
|
dma_avail = ( dma_rd + DMA_LIST_SIZE - dma_wr )
|
|
& (DMA_LIST_SIZE-1);
|
|
|
|
/*
|
|
* Check for queue full or wrap past write okay pointer
|
|
*/
|
|
if ( dma_avail < j ||
|
|
( dma_wr + j > eup->eu_rxdmawr + DMA_LIST_SIZE ) ) {
|
|
/*
|
|
* There's no room in the DMA list to insert
|
|
* this request. Since we haven't changed anything
|
|
* yet and the PDU is good, exit now and service
|
|
* it next time around. What we really need to do
|
|
* is wait for the RX list to drain and that won't
|
|
* happen if we keep trying to process PDUs here.
|
|
*/
|
|
eup->eu_stats.eni_st_drv.drv_rv_nodma++;
|
|
#ifdef DO_LOG
|
|
log ( LOG_ERR,
|
|
"eni_do_service: No room in receive DMA list. Postponing service request.\n" );
|
|
#endif
|
|
/*
|
|
* Free the local buffer chain
|
|
*/
|
|
KB_FREEALL ( m );
|
|
/*
|
|
* Clear the IN_SERVICE indicator for this VCC.
|
|
*/
|
|
vct->vci_control &= ~VCI_IN_SERVICE;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we have a buffer chain, save the starting
|
|
* dma_list location.
|
|
*/
|
|
if ( upp ) {
|
|
*upp = dma_wr << 16;
|
|
}
|
|
|
|
/*
|
|
* Stuff the DMA list
|
|
*/
|
|
j >>= 1;
|
|
for ( i = 0; i < j; i++ ) {
|
|
eup->eu_rxdma[dma_wr*2] = dma[i*2];
|
|
eup->eu_rxdma[dma_wr*2+1] = dma[i*2+1];
|
|
dma_wr = (dma_wr+1) & (DMA_LIST_SIZE-1);
|
|
}
|
|
/*
|
|
* If we have a buffer chain, save the location of
|
|
* the ending dma_list location and queue the chain
|
|
* so that we can recover the resources later.
|
|
*/
|
|
if ( upp ) {
|
|
*upp |= dma_wr;
|
|
/*
|
|
* Place buffer on receive queue waiting for RX_DMA
|
|
*/
|
|
if ( _IF_QFULL ( &eup->eu_rxqueue ) ) {
|
|
/*
|
|
* We haven't done anything we can't back out
|
|
* of. Drop request and service it next time.
|
|
* We've inserted the DMA list but it's not
|
|
* valid until we advance the RX_WR pointer,
|
|
* thus it's okay to bail here...
|
|
*/
|
|
eup->eu_stats.eni_st_drv.drv_rv_rxq++;
|
|
#ifdef DO_LOG
|
|
log ( LOG_ERR,
|
|
"eni_do_service: RX drain queue full. Postponing servicing.\n" );
|
|
#endif
|
|
KB_FREEALL ( m );
|
|
/*
|
|
* Clear the IN_SERVICE indicator for this VCC.
|
|
*/
|
|
vct->vci_control &= ~VCI_IN_SERVICE;
|
|
return;
|
|
} else {
|
|
_IF_ENQUEUE ( &eup->eu_rxqueue, m );
|
|
/*
|
|
* Advance the RX_WR pointer to cause
|
|
* the adapter to work on this DMA list.
|
|
*/
|
|
eup->eu_midway[MIDWAY_RX_WR] = dma_wr;
|
|
}
|
|
}
|
|
/*
|
|
* Advance our notion of where the next PDU
|
|
* should start.
|
|
*/
|
|
rdptr = (rdptr + n_cells*WORDS_PER_CELL + 1)
|
|
& (mask-1);
|
|
evp->ev_rxpos = rdptr;
|
|
|
|
/*
|
|
* Increment cells/pdu received stats.
|
|
*/
|
|
eup->eu_stats.eni_st_atm.atm_rcvd += n_cells;
|
|
if ( aal5 ) {
|
|
eup->eu_stats.eni_st_aal5.aal5_rcvd += n_cells;
|
|
eup->eu_stats.eni_st_aal5.aal5_pdu_rcvd++;
|
|
} else {
|
|
eup->eu_stats.eni_st_aal0.aal0_rcvd += n_cells;
|
|
}
|
|
|
|
/*
|
|
* Continue processing PDUs on this same VCI
|
|
*/
|
|
}
|
|
|
|
next_vcc:
|
|
/*
|
|
* Advance to next entry in the service_list.
|
|
*/
|
|
eup->eu_servread = (eup->eu_servread + 1) & SVC_SIZE_MASK;
|
|
|
|
/*
|
|
* And clear the IN_SERVICE indicator for this VCC.
|
|
*/
|
|
vct->vci_control &= ~VCI_IN_SERVICE;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Drain Receive queue
|
|
*
|
|
* As we build DMA lists to move PDUs from adapter buffers into host
|
|
* buffers, we place the request on a private ifqueue so that we can
|
|
* free any resources AFTER we know they've been successfully DMAed.
|
|
* As part of the service processing, we record the PDUs start and stop
|
|
* entries in the DMA list, and prevent wrapping. When we pull the top
|
|
* entry off, we simply check that the current DMA location is outside
|
|
* this PDU and if so, it's okay to free things.
|
|
*
|
|
* Arguments:
|
|
* eup pointer to device unit structure
|
|
*
|
|
* Returns:
|
|
* none
|
|
*
|
|
*/
|
|
void
|
|
eni_recv_drain ( eup )
|
|
Eni_unit *eup;
|
|
{
|
|
KBuffer *m;
|
|
Eni_vcc *evp;
|
|
struct vccb *vcp;
|
|
u_long vcc;
|
|
u_long DMA_Rdptr;
|
|
u_long dma_wrp;
|
|
u_long start, stop;
|
|
int que = 0;
|
|
int s;
|
|
|
|
s = splimp();
|
|
/* Pop first buffer */
|
|
_IF_DEQUEUE ( &eup->eu_rxqueue, m );
|
|
while ( m ) {
|
|
u_long *up;
|
|
u_long pdulen;
|
|
|
|
KB_DATASTART ( m, up, u_long * );
|
|
|
|
/*
|
|
* Grab the VCI number
|
|
*/
|
|
vcc = *up++;
|
|
|
|
/*
|
|
* Check to see if we can process this buffer yet.
|
|
*/
|
|
/* Get current DMA_Rdptr */
|
|
DMA_Rdptr = eup->eu_midway[MIDWAY_RX_RD];
|
|
/* Boundaries for first buffer */
|
|
dma_wrp = *up++;
|
|
start = dma_wrp >> 16;
|
|
stop = dma_wrp & 0xffff;
|
|
/*
|
|
* Start should not equal stop because that would
|
|
* mean we tried inserting a NULL DMA list.
|
|
*/
|
|
if ( start > stop ) { /* We wrapped */
|
|
if ( !(DMA_Rdptr >= stop && DMA_Rdptr < start) ) {
|
|
_IF_PREPEND ( &eup->eu_rxqueue, m );
|
|
goto finish;
|
|
}
|
|
} else {
|
|
if ( DMA_Rdptr < stop && DMA_Rdptr >= start ) {
|
|
_IF_PREPEND ( &eup->eu_rxqueue, m );
|
|
goto finish;
|
|
}
|
|
}
|
|
/*
|
|
* Adapter is finished with this buffer, we can
|
|
* continue processing it now.
|
|
*/
|
|
|
|
/*
|
|
* Locate incoming VCC for this PDU
|
|
*/
|
|
evp = (Eni_vcc *) atm_dev_vcc_find ( (Cmn_unit *)eup,
|
|
0, vcc, VCC_IN );
|
|
|
|
if ( evp == NULL ) {
|
|
eup->eu_stats.eni_st_drv.drv_rv_novcc++;
|
|
KB_FREEALL ( m );
|
|
goto next_buffer;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ( eni_pdu_print )
|
|
atm_dev_pdu_print ( (Cmn_unit *)eup, (Cmn_vcc *)evp, m,
|
|
"eni_stack_drain" );
|
|
#endif
|
|
|
|
/*
|
|
* Grab theoretical PDU length
|
|
*/
|
|
pdulen = *up++;
|
|
|
|
/*
|
|
* Quick, count the PDU
|
|
*/
|
|
eup->eu_pif.pif_ipdus++;
|
|
eup->eu_pif.pif_ibytes += pdulen;
|
|
if ( evp ) {
|
|
vcp = evp->ev_connvc->cvc_vcc;
|
|
if ( vcp ) {
|
|
vcp->vc_ipdus++;
|
|
vcp->vc_ibytes += pdulen;
|
|
if ( vcp->vc_nif ) {
|
|
vcp->vc_nif->nif_ibytes += pdulen;
|
|
vcp->vc_nif->nif_if.if_ipackets++;
|
|
#if (defined(BSD) && (BSD >= 199103))
|
|
vcp->vc_nif->nif_if.if_ibytes += pdulen;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Advance DMA write allowable pointer
|
|
*/
|
|
eup->eu_rxdmawr = stop;
|
|
|
|
/*
|
|
* Get packet PDU length
|
|
*/
|
|
KB_PLENGET ( m, pdulen );
|
|
|
|
/*
|
|
* Only try queueing this if there is data
|
|
* to be handed up to the next layer. Errors
|
|
* such as CRC and VC trashing will get us this
|
|
* far to advance pointers, etc., but the PDU
|
|
* length will be zero.
|
|
*/
|
|
if ( pdulen ) {
|
|
/*
|
|
* We saved three words back in eni_do_service()
|
|
* to use for callback. Since the core only
|
|
* expects two words, skip over the first one.
|
|
* Then, reset up pointer to start of buffer data
|
|
* area and write the callback info.
|
|
*/
|
|
KB_HEADADJ ( m, -sizeof(u_long) );
|
|
KB_DATASTART ( m, up, u_long * );
|
|
*((int *)up) = (int)eni_recv_stack;
|
|
up++;
|
|
*((int *)up) = (int)evp;
|
|
/*
|
|
* Schedule callback
|
|
*/
|
|
if (IF_HANDOFF(&atm_intrq, m, NULL)) {
|
|
que++;
|
|
} else {
|
|
eup->eu_stats.eni_st_drv.drv_rv_intrq++;
|
|
eup->eu_pif.pif_ierrors++;
|
|
#ifdef DO_LOG
|
|
log ( LOG_ERR,
|
|
"eni_receive_drain: ATM_INTRQ is full. Unable to pass up stack.\n" );
|
|
#endif
|
|
}
|
|
} else {
|
|
/*
|
|
* Free zero-length buffer
|
|
*/
|
|
KB_FREEALL(m);
|
|
}
|
|
|
|
next_buffer:
|
|
/*
|
|
* Look for next buffer
|
|
*/
|
|
_IF_DEQUEUE ( &eup->eu_rxqueue, m );
|
|
}
|
|
finish:
|
|
(void) splx(s);
|
|
|
|
/*
|
|
* If we found any completed buffers, schedule a call into
|
|
* the kernel to process the atm_intrq.
|
|
*/
|
|
if ( que )
|
|
SCHED_ATM;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
/*
|
|
* Pass incoming PDU up Stack
|
|
*
|
|
* This function is called via the core ATM interrupt queue callback
|
|
* set in eni_recv_drain(). It will pass the supplied incoming
|
|
* PDU up the incoming VCC's stack.
|
|
*
|
|
* Arguments:
|
|
* tok token to identify stack instantiation
|
|
* m pointer to incoming PDU buffer chain
|
|
*
|
|
* Returns:
|
|
* none
|
|
*/
|
|
static void
|
|
eni_recv_stack ( tok, m )
|
|
void *tok;
|
|
KBuffer *m;
|
|
{
|
|
Eni_vcc *evp = (Eni_vcc *)tok;
|
|
int err;
|
|
|
|
/*
|
|
* This should never happen now but if it does and we don't stop it,
|
|
* we end up panic'ing in netatm when trying to pull a function
|
|
* pointer and token value out of a buffer with address zero.
|
|
*/
|
|
if ( !m ) {
|
|
#ifdef DO_LOG
|
|
log ( LOG_ERR,
|
|
"eni_recv_stack: NULL buffer, tok = %p\n", tok );
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Send the data up the stack
|
|
*/
|
|
STACK_CALL ( CPCS_UNITDATA_SIG, evp->ev_upper,
|
|
(void *)evp->ev_toku, evp->ev_connvc, (int)m, 0, err );
|
|
if ( err ) {
|
|
KB_FREEALL ( m );
|
|
}
|
|
|
|
return;
|
|
}
|
|
|