1820df7a2d
Host ATM Research Platform (HARP), Network Computing Services, Inc. This software was developed with the support of the Defense Advanced Research Projects Agency (DARPA).
372 lines
7.6 KiB
C
372 lines
7.6 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: fore_transmit.c,v 1.8 1998/07/17 20:19:37 root Exp $
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*
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*/
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/*
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* FORE Systems 200-Series Adapter Support
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* ---------------------------------------
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*
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* Transmit queue management
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*
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*/
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#ifndef lint
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static char *RCSid = "@(#) $Id: fore_transmit.c,v 1.8 1998/07/17 20:19:37 root Exp $";
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#endif
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#include <dev/hfa/fore_include.h>
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/*
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* Allocate Transmit Queue Data Structures
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*
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* Arguments:
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* fup pointer to device unit structure
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*
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* Returns:
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* 0 allocations successful
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* else allocation failed
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*/
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int
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fore_xmit_allocate(fup)
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Fore_unit *fup;
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{
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void *memp;
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H_xmit_queue *hxp;
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int i;
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/*
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* Allocate non-cacheable memory for transmit status words
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*/
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memp = atm_dev_alloc(sizeof(Q_status) * XMIT_QUELEN,
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QSTAT_ALIGN, ATM_DEV_NONCACHE);
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if (memp == NULL) {
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return (1);
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}
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fup->fu_xmit_stat = (Q_status *) memp;
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memp = DMA_GET_ADDR(fup->fu_xmit_stat, sizeof(Q_status) * XMIT_QUELEN,
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QSTAT_ALIGN, ATM_DEV_NONCACHE);
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if (memp == NULL) {
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return (1);
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}
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fup->fu_xmit_statd = (Q_status *) memp;
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/*
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* Allocate memory for transmit descriptors
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*
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* We will allocate the transmit descriptors individually rather than
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* as a single memory block, which will often be larger than a memory
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* page. On some systems (eg. FreeBSD) the physical addresses of
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* adjacent virtual memory pages are not contiguous.
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*/
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hxp = fup->fu_xmit_q;
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for (i = 0; i < XMIT_QUELEN; i++, hxp++) {
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/*
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* Allocate a transmit descriptor for this queue entry
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*/
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hxp->hxq_descr = atm_dev_alloc(sizeof(Xmit_descr),
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XMIT_DESCR_ALIGN, 0);
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if (hxp->hxq_descr == NULL) {
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return (1);
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}
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hxp->hxq_descr_dma = DMA_GET_ADDR(hxp->hxq_descr,
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sizeof(Xmit_descr), XMIT_DESCR_ALIGN, 0);
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if (hxp->hxq_descr_dma == NULL) {
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return (1);
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}
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}
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return (0);
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}
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/*
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* Transmit Queue Initialization
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*
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* Allocate and initialize the host-resident transmit queue structures
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* and then initialize the CP-resident queue structures.
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*
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* Called at interrupt level.
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*
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* Arguments:
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* fup pointer to device unit structure
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*
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* Returns:
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* none
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*/
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void
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fore_xmit_initialize(fup)
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Fore_unit *fup;
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{
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Aali *aap = fup->fu_aali;
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Xmit_queue *cqp;
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H_xmit_queue *hxp;
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Q_status *qsp;
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Q_status *qsp_dma;
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int i;
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/*
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* Point to CP-resident transmit queue
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*/
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cqp = (Xmit_queue *)(fup->fu_ram + CP_READ(aap->aali_xmit_q));
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/*
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* Point to host-resident transmit queue structures
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*/
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hxp = fup->fu_xmit_q;
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qsp = fup->fu_xmit_stat;
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qsp_dma = fup->fu_xmit_statd;
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/*
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* Loop thru all queue entries and do whatever needs doing
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*/
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for (i = 0; i < XMIT_QUELEN; i++) {
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/*
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* Set queue status word to free
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*/
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*qsp = QSTAT_FREE;
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/*
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* Set up host queue entry and link into ring
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*/
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hxp->hxq_cpelem = cqp;
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hxp->hxq_status = qsp;
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if (i == (XMIT_QUELEN - 1))
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hxp->hxq_next = fup->fu_xmit_q;
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else
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hxp->hxq_next = hxp + 1;
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/*
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* Now let the CP into the game
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*/
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cqp->cq_status = (CP_dma) CP_WRITE(qsp_dma);
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/*
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* Bump all queue pointers
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*/
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hxp++;
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qsp++;
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qsp_dma++;
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cqp++;
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}
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/*
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* Initialize queue pointers
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*/
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fup->fu_xmit_head = fup->fu_xmit_tail = fup->fu_xmit_q;
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return;
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}
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/*
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* Drain Transmit Queue
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*
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* This function will free all completed entries at the head of the
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* transmit queue. Freeing the entry includes releasing the transmit
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* buffers (buffer chain) back to the kernel.
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*
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* May be called in interrupt state.
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* Must be called with interrupts locked out.
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*
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* Arguments:
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* fup pointer to device unit structure
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*
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* Returns:
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* none
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*/
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void
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fore_xmit_drain(fup)
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Fore_unit *fup;
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{
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H_xmit_queue *hxp;
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H_dma *sdmap;
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Fore_vcc *fvp;
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struct vccb *vcp;
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KBuffer *m;
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/*
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* Process each completed entry
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*/
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while (*fup->fu_xmit_head->hxq_status & QSTAT_COMPLETED) {
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hxp = fup->fu_xmit_head;
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/*
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* Release the entry's DMA addresses and buffer chain
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*/
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for (m = hxp->hxq_buf, sdmap = hxp->hxq_dma; m;
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m = KB_NEXT(m), sdmap++) {
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caddr_t cp;
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KB_DATASTART(m, cp, caddr_t);
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DMA_FREE_ADDR(cp, *sdmap, KB_LEN(m), 0);
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}
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KB_FREEALL(hxp->hxq_buf);
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/*
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* Get VCC over which data was sent (may be null if
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* VCC has been closed in the meantime)
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*/
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fvp = hxp->hxq_vcc;
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/*
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* Now collect some statistics
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*/
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if (*hxp->hxq_status & QSTAT_ERROR) {
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/*
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* CP ran into problems, not much we can do
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* other than record the event
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*/
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fup->fu_pif.pif_oerrors++;
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if (fvp) {
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vcp = fvp->fv_connvc->cvc_vcc;
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vcp->vc_oerrors++;
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if (vcp->vc_nif)
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vcp->vc_nif->nif_if.if_oerrors++;
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}
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} else {
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/*
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* Good transmission
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*/
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int len = XDS_GET_LEN(hxp->hxq_descr->xd_spec);
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fup->fu_pif.pif_opdus++;
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fup->fu_pif.pif_obytes += len;
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if (fvp) {
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vcp = fvp->fv_connvc->cvc_vcc;
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vcp->vc_opdus++;
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vcp->vc_obytes += len;
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if (vcp->vc_nif) {
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vcp->vc_nif->nif_obytes += len;
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vcp->vc_nif->nif_if.if_opackets++;
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#if (defined(BSD) && (BSD >= 199103))
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vcp->vc_nif->nif_if.if_obytes += len;
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#endif
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}
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}
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}
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/*
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* Mark this entry free for use and bump head pointer
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* to the next entry in the queue
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*/
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*hxp->hxq_status = QSTAT_FREE;
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fup->fu_xmit_head = hxp->hxq_next;
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}
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return;
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}
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/*
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* Free Transmit Queue Data Structures
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*
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* Arguments:
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* fup pointer to device unit structure
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*
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* Returns:
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* none
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*/
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void
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fore_xmit_free(fup)
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Fore_unit *fup;
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{
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H_xmit_queue *hxp;
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H_dma *sdmap;
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KBuffer *m;
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int i;
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/*
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* Free any transmit buffers left on the queue
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*/
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if (fup->fu_flags & CUF_INITED) {
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while (*fup->fu_xmit_head->hxq_status != QSTAT_FREE) {
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hxp = fup->fu_xmit_head;
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/*
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* Release the entry's DMA addresses and buffer chain
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*/
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for (m = hxp->hxq_buf, sdmap = hxp->hxq_dma; m;
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m = KB_NEXT(m), sdmap++) {
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caddr_t cp;
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KB_DATASTART(m, cp, caddr_t);
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DMA_FREE_ADDR(cp, *sdmap, KB_LEN(m), 0);
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}
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KB_FREEALL(hxp->hxq_buf);
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*hxp->hxq_status = QSTAT_FREE;
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fup->fu_xmit_head = hxp->hxq_next;
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}
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}
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/*
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* Free the status words
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*/
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if (fup->fu_xmit_stat) {
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if (fup->fu_xmit_statd) {
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DMA_FREE_ADDR(fup->fu_xmit_stat, fup->fu_xmit_statd,
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sizeof(Q_status) * XMIT_QUELEN,
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ATM_DEV_NONCACHE);
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}
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atm_dev_free((void *)fup->fu_xmit_stat);
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fup->fu_xmit_stat = NULL;
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fup->fu_xmit_statd = NULL;
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}
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/*
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* Free the transmit descriptors
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*/
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hxp = fup->fu_xmit_q;
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for (i = 0; i < XMIT_QUELEN; i++, hxp++) {
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/*
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* Free the transmit descriptor for this queue entry
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*/
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if (hxp->hxq_descr_dma) {
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DMA_FREE_ADDR(hxp->hxq_descr, hxp->hxq_descr_dma,
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sizeof(Xmit_descr), 0);
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hxp->hxq_descr_dma = NULL;
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}
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if (hxp->hxq_descr) {
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atm_dev_free(hxp->hxq_descr);
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hxp->hxq_descr = NULL;
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}
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}
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return;
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}
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