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freebsd-dev/sys/dev/hea/eni_receive.c
Peter Wemm c3aac50f28 $Id$ -> $FreeBSD$
1999-08-28 01:08:13 +00:00

872 lines
21 KiB
C
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/*
*
* ===================================
* 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.
*
* @(#) $FreeBSD$
*
*/
/*
* Efficient ENI Adapter Support
* -----------------------------
*
* Receive management
*
*/
#include <netatm/kern_include.h>
#include <dev/hea/eni_stats.h>
#include <dev/hea/eni.h>
#include <dev/hea/eni_var.h>
#ifndef lint
__RCSID("@(#) $FreeBSD$");
#endif
static void eni_recv_stack __P((void *, KBuffer *));
#ifdef DIAGNOSTIC
extern int eni_pdu_print;
#endif
/*
* Procedure to remove VCs from the Service List and generate DMA
* requests to move the associated PDUs into host memory. As PDUs
* are completed in adapter memory, the adapter examines the IN_SERVICE
* bit for the VC in the VC table. If this bit is not set, the adapter
* will place the VC number at the end of the service list queue, set
* the IN_SERVICE bit in the VC table, and interrupt the host. The host
* will remove VCs from the service list, clear the IN_SERVICE bit in
* the VC table, and create a DMA list to move the PDU into host buffers.
*
* Arguments:
* eup pointer to per unit structure
*
* Returns:
* none
*
*/
void
eni_do_service ( eup )
Eni_unit *eup;
{
int vcc;
Eni_vcc *evp;
u_long servwrite;
VCI_Table *vct;
u_long rdptr;
u_long *rxp;
KBuffer *m;
u_long dma[TEMP_DMA_SIZE];
u_long i, j;
u_long dma_rd, dma_wr;
u_long dma_avail;
int pdulen;
int mask;
u_long *upp;
/*
* Where is the adapter currently inserting entries?
*/
servwrite = eup->eu_midway[MIDWAY_SVCWR] & SVC_SIZE_MASK;
/*
* As long as we're not caught up with the adapter, keep
* removing VCs from the service list.
*/
while ( servwrite != eup->eu_servread ) {
int vci_hdr;
u_long descr;
/*
* Get VC number and find VC table entry.
*/
vcc = eup->eu_svclist[eup->eu_servread];
vct = &eup->eu_vcitbl[vcc];
vci_hdr = vct->vci_control; /* Current status */
/*
* Check that this VCC still needs servicing. We
* might have closed this VCC down in between
* the adapter setting the flag and our checking
* the flag. Also check that we haven't placed the
* VCC into TRASH mode.
*/
if ( ( vci_hdr & VCI_IN_SERVICE ) == 0 ||
( (vci_hdr & ~VCI_MODE_MASK) ==
(VCI_MODE_TRASH << VCI_MODE_SHIFT) ) )
goto next_vcc;
/*
* Find the size of this VCs buffer
*/
mask = (vci_hdr >> VCI_SIZE_SHIFT) & VCI_SIZE_MASK;
mask = 1 << (ENI_LOC_PREDIV + mask);
/* Turn byte count into word count */
mask >>= 2;
/*
* Find the start of the adapter buffer for this VC.
*/
rxp = (u_long *)
((int)(((vci_hdr >> VCI_LOC_SHIFT ) & VCI_LOC_MASK)
<< ENI_LOC_PREDIV) + (int)eup->eu_ram);
/*
* Locate incoming VCC for this PDU and find where we
* should next read from.
*/
evp = (Eni_vcc *) atm_dev_vcc_find ( (Cmn_unit *)eup,
0, vcc, VCC_IN );
if ( evp == (Eni_vcc *)NULL )
goto next_vcc; /* VCI no longer active */
rdptr = evp->ev_rxpos;
/*
* Find out where the adapter is currently reassembling.
* The PDU which starts at descr is not yet complete so we
* must stop there.
*/
descr = ( vct->vci_descr >> 16 ) & 0x7FFF;
/*
* As long as we haven't processed all the completed PDUs on
* this VC, keep going...
*/
while ( rdptr != descr )
{
int n_cells;
int pdu_descr;
int aal5;
/*
* Ensure that the following are reset for every new
* PDU.
*/
upp = NULL;
m = NULL;
/*
* Fisrt build a DMA with JK to skip the descriptor word.
* We must always skip the descriptor even if it turns out
* that there isn't any PDU here.
*/
j = 0;
dma[j++] = (((rdptr + 1) & (mask-1)) << DMA_COUNT_SHIFT ) |
( vcc << DMA_VCC_SHIFT ) | DMA_JK;
dma[j++] = 0;
/*
* We'll use some of the values below for skipping
* bad PDUs or counting statistics so compute them
* now.
*/
/*
* Grab a copy of the descriptor word
*/
pdu_descr = rxp[rdptr];
/*
* Strip out cell count from descriptor word.
* At this point, we still don't know if there
* is any real data until after we check for
* TRASH mode.
*/
n_cells = pdu_descr & DESCR_CELL_COUNT;
/*
* Is this an AAL5 PDU? Check MODE in vci_hdr.
*/
aal5 = ( ( vci_hdr & ~VCI_MODE_MASK ) ==
VCI_MODE_AAL5 << VCI_MODE_SHIFT );
/*
* Now check to see if we're trashing on this vcc.
* If so, there is no data with this VC and the
* next word after the current descriptor is the
* descriptor for the next PDU.
*/
if ( ( pdu_descr & DESCR_TRASH_BIT ) != 0 ) {
if ( aal5 )
/*
* Count as number of AAL5 cells dropped
*/
eup->eu_stats.eni_st_aal5.aal5_drops += n_cells;
else
/*
* Count as number of AAL0 cells dropped
*/
eup->eu_stats.eni_st_aal0.aal0_drops += n_cells;
eup->eu_pif.pif_ierrors++;
/*
* When cells have been trashed, all we have in the
* buffer is a descriptor word. There are no data
* words. Set the number of cells to zero so that
* we correctly skip to the next word which will
* be the descriptor for the next PDU.
*/
n_cells = 0;
/*
* Go issue the DMA to skip this descriptor word.
*/
goto send_dma;
}
/*
* Data length: number of cells * cell size
*/
pdulen = n_cells * BYTES_PER_CELL;
/*
* If this is an AAL5 PDU, then we need to check
* for the presence of any CRC errors. If there
* is one or more CRC errors, then we are going to
* drop this PDU.
*/
if ( aal5 && ( pdu_descr & DESCR_CRC_ERR ) ) {
/*
* Count the stat
*/
eup->eu_pif.pif_ierrors++;
eup->eu_stats.eni_st_aal5.aal5_pdu_crc++;
if ( evp->ev_connvc->cvc_vcc )
evp->ev_connvc->cvc_vcc->vc_ierrors++;
/*
* Build a DMA entry to skip the rest of this
* PDU.
*/
dma[j++] =
(((rdptr + n_cells*WORDS_PER_CELL + 1)
& (mask-1)) << DMA_COUNT_SHIFT ) |
(vcc << DMA_VCC_SHIFT ) | DMA_JK;
dma[j++] = 0;
/*
* All done with this PDU. Get a buffer to save some
* data for reclamation services.
*/
KB_ALLOCPKT ( m, ENI_SMALL_BSIZE, KB_F_NOWAIT,
KB_T_DATA );
if ( m ) {
u_long *up;
KB_DATASTART ( m, up, u_long * );
/*
* Indicate no PDU
*/
KB_PLENSET ( m, 0 );
/*
* Set buffer length - only driver overhead
*/
KB_LEN ( m ) = 3 * sizeof ( u_long );
/*
* Insert vcc, space for DMA pointers,
* and pdulen
*/
*up++ = vcc;
upp = up; /* Remember location */
up++; /* And skip it */
/* - to be filled later */
*up = pdulen; /* Actual PDU length if it */
/* were valid */
} else {
/*
* We've a real problem here as now we can't
* reclaim/advance resources/safety pointers.
*/
eup->eu_stats.eni_st_drv.drv_rv_norsc++;
#ifdef DO_LOG
log ( LOG_ERR,
"eni_do_service: No drain buffers available. Receiver about to lock.\n" );
#endif
}
goto send_dma;
}
/*
* Do we need to strip the AAL layer? Yes if this
* is an AAL5 PDU.
*/
if ( aal5 ) {
/*
* Grab the CS-PDU length. Find the address of the
* last word, back up one word to skip CRC, and
* then mask the whole thing to handle circular wraps.
*/
pdulen = rxp[(rdptr + n_cells*WORDS_PER_CELL - 1)
& (mask-1)]
& 0xFFFF;
}
/*
* We now have a valid PDU of some length. Build
* the necessary DMA list to move it into host
* memory.
*/
/*
* Get an initial buffer.
*/
KB_ALLOCPKT ( m, ENI_SMALL_BSIZE, KB_F_NOWAIT, KB_T_DATA );
/*
* Do we have a valid buffer?
*/
if ( m != (KBuffer *)NULL )
{
int len;
u_long *up;
KBuffer *m0;
KB_DATASTART ( m, up, u_long * );
/*
* Fill in pdulen in PKTHDR structure (for IP).
*/
KB_PLENSET ( m, pdulen );
/*
* We're going to save the VCI nuber, the start
* and stop DMA pointers, and the PDU length at
* the head of the buffer. We'll pull this out
* later after the DMA has completed.
*
* Insert VCI number as first word in first buffer,
* remeber where we want to store the start/stop
* pointers, and store the PDU length.
*/
*up++ = vcc; /* PDU's VCC */
upp = up; /* Remember where we are */
up++; /* To stuff start/stop pointers in */
*up++ = pdulen; /* PDU's length */
/*
* Leave some extra room in case a higher protocol
* (IP) wants to do a pullup. Maybe we can keep
* someone from having to allocate another buffer
* a do a larger memory copy.
*/
len = MIN ( ENI_SMALL_BSIZE, pdulen );
(void) eni_set_dma ( eup, 1, dma, TEMP_DMA_SIZE, &j,
vcc, (u_long)up, len );
/*
* Adjust length of remaining data in PDU
*/
pdulen -= len;
/*
* Set buffer length, including our overhead
*/
KB_LEN ( m ) = len + 3 * sizeof ( u_long );
/*
* Finish by moving anything which won't fit in
* first buffer
*/
m0 = m;
while ( pdulen ) {
KBuffer *m1;
u_long data_addr;
/*
* Get another buffer
*/
KB_ALLOCEXT ( m1, ENI_LARGE_BSIZE, KB_F_NOWAIT,
KB_T_DATA );
/*
* If we succeeded...
*/
if ( m1 ) {
/*
* Figure out how much we can move into
* this buffer.
*/
len = MIN ( ENI_LARGE_BSIZE, pdulen );
/*
* Setup DMA list for this buffer
*/
KB_DATASTART ( m1, data_addr, u_long );
(void) eni_set_dma
( eup, 1, dma, TEMP_DMA_SIZE, &j, vcc,
data_addr, len );
/*
* Adjust remaining length
*/
pdulen -= len;
/*
* Set buffer length
*/
KB_LEN ( m1 ) = len;
/*
* Link new buffer onto end and advance
* pointer
*/
KB_NEXT ( m0 ) = m1;
m0 = m1;
} else {
/*
* Either we were unable to grab another
* buffer or there are no large buffers
* available. We know that the first
* buffer is valid, so drop everything
* else, build a JK DMA to skip/drop this
* PDU, set the pointers to reclaim
* resources/advance pointers, and
* finish this PDU now.
*/
if ( KB_NEXT ( m ) )
KB_FREEALL ( KB_NEXT ( m ) );
eup->eu_pif.pif_ierrors++;
j = 2;
dma[j++] =
(((rdptr + n_cells*WORDS_PER_CELL + 1)
& (mask-1)) << DMA_COUNT_SHIFT ) |
(vcc << DMA_VCC_SHIFT ) |
DMA_JK;
dma[j++] = 0;
/*
* Reset PDU length to zero
*/
KB_PLENSET ( m, 0 );
/*
* Count some statistics
*/
/*
* Count this as dropped cells
*/
if ( aal5 ) {
eup->eu_stats.eni_st_aal5.aal5_drops +=
n_cells;
eup->eu_stats.eni_st_aal5.aal5_pdu_drops++;
} else
eup->eu_stats.eni_st_aal0.aal0_drops +=
n_cells;
/*
* Drop it
*/
goto send_dma;
}
}
/*
* If necessary, skip AAL layer
*/
if ( aal5 ) {
dma[j++] =
(((rdptr + n_cells*WORDS_PER_CELL + 1)
& (mask-1)) << DMA_COUNT_SHIFT)
| (vcc << DMA_VCC_SHIFT) | DMA_JK;
dma[j++] = 0;
}
} else {
/*
* We failed to get an initial buffer. Since we
* haven't changed anything for this PDU yet and the
* PDU is still valid, exit now and try to service it
* next time around. We're not very likely to get
* another buffer right now anyways.
*/
eup->eu_stats.eni_st_drv.drv_rv_nobufs++;
#ifdef DO_LOG
log ( LOG_ERR,
"eni_do_service: No buffers available. Exiting without servicing service list.\n" );
#endif
/*
* Clear the IN_SERVICE indicator for this VCC
*/
vct->vci_control &= ~VCI_IN_SERVICE;
return;
}
send_dma:
/*
* Set the end bit on the last DMA for this PDU
*/
dma[j-2] |= DMA_END_BIT;
/*
* Where are the current DMA pointers
*/
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_QFULL ( &atm_intrq ) ) {
que++;
IF_ENQUEUE ( &atm_intrq, m );
} 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
KB_FREEALL ( m );
}
} 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;
}
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