usr/src/sys/vax/if/if_uba.c

/*	if_uba.c	4.16	82/12/17	*/

#include "../machine/pte.h"

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/map.h"
#include "../h/buf.h"
#include "../h/cmap.h"
#include "../h/vmmac.h"
#include "../h/socket.h"

#include "../net/if.h"

#include "../vax/mtpr.h"
#include "../vaxif/if_uba.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"

/*
 * Routines supporting UNIBUS network interfaces.
 *
 * TODO:
 *	Support interfaces using only one BDP statically.
 */

/*
 * Init UNIBUS for interface on uban whose headers of size hlen are to
 * end on a page boundary.  We allocate a UNIBUS map register for the page
 * with the header, and nmr more UNIBUS map registers for i/o on the adapter,
 * doing this twice: once for reading and once for writing.  We also
 * allocate page frames in the mbuffer pool for these pages.
 */
if_ubainit(ifu, uban, hlen, nmr)
	register struct ifuba *ifu;
	int uban, hlen, nmr;
{
	register caddr_t cp;
	int i, ncl;

	ncl = clrnd(nmr + CLSIZE) / CLSIZE;
	if (ifu->ifu_r.ifrw_addr)
		cp = ifu->ifu_r.ifrw_addr - (CLBYTES - hlen);
	else {
		cp = m_clalloc(2 * ncl, MPG_SPACE);
		if (cp == 0)
			return (0);
		ifu->ifu_r.ifrw_addr = cp + CLBYTES - hlen;
		ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES;
		ifu->ifu_hlen = hlen;
		ifu->ifu_uban = uban;
		ifu->ifu_uba = uba_hd[uban].uh_uba;
	}
	if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0)
		goto bad;
	if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0)
		goto bad2;
	for (i = 0; i < nmr; i++)
		ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i];
	ifu->ifu_xswapd = 0;
	return (1);
bad2:
	ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info);
bad:
	m_pgfree(cp, 2 * ncl);
	ifu->ifu_r.ifrw_addr = 0;
	return (0);
}

/*
 * Setup either a ifrw structure by allocating UNIBUS map registers,
 * possibly a buffered data path, and initializing the fields of
 * the ifrw structure to minimize run-time overhead.
 */
static
if_ubaalloc(ifu, ifrw, nmr)
	struct ifuba *ifu;
	register struct ifrw *ifrw;
	int nmr;
{
	register int info;

	info =
	    uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen,
	        ifu->ifu_flags);
	if (info == 0)
		return (0);
	ifrw->ifrw_info = info;
	ifrw->ifrw_bdp = UBAI_BDP(info);
	ifrw->ifrw_proto = UBAMR_MRV | (UBAI_BDP(info) << UBAMR_DPSHIFT);
	ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + 1];
	return (1);
}

/*
 * Pull read data off a interface.
 * Len is length of data, with local net header stripped.
 * Off is non-zero if a trailer protocol was used, and
 * gives the offset of the trailer information.
 * We copy the trailer information and then all the normal
 * data into mbufs.  When full cluster sized units are present
 * on the interface on cluster boundaries we can get them more
 * easily by remapping, and take advantage of this here.
 */
struct mbuf *
if_rubaget(ifu, totlen, off0)
	register struct ifuba *ifu;
	int totlen, off0;
{
	struct mbuf *top, **mp, *m;
	int off = off0, len;
	register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;


	top = 0;
	mp = &top;
	while (totlen > 0) {
		MGET(m, M_DONTWAIT, MT_DATA);
		if (m == 0)
			goto bad;
		if (off) {
			len = totlen - off;
			cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off;
		} else
			len = totlen;
		if (len >= CLBYTES) {
			struct mbuf *p;
			struct pte *cpte, *ppte;
			int x, *ip, i;

			MCLGET(p, 1);
			if (p == 0)
				goto nopage;
			len = m->m_len = CLBYTES;
			m->m_off = (int)p - (int)m;
			if (!claligned(cp))
				goto copy;

			/*
			 * Switch pages mapped to UNIBUS with new page p,
			 * as quick form of copy.  Remap UNIBUS and invalidate.
			 */
			cpte = &Mbmap[mtocl(cp)*CLSIZE];
			ppte = &Mbmap[mtocl(p)*CLSIZE];
			x = btop(cp - ifu->ifu_r.ifrw_addr);
			ip = (int *)&ifu->ifu_r.ifrw_mr[x];
			for (i = 0; i < CLSIZE; i++) {
				struct pte t;
				t = *ppte; *ppte++ = *cpte; *cpte = t;
				*ip++ =
				    cpte++->pg_pfnum|ifu->ifu_r.ifrw_proto;
				mtpr(TBIS, cp);
				cp += NBPG;
				mtpr(TBIS, (caddr_t)p);
				p += NBPG / sizeof (*p);
			}
			goto nocopy;
		}
nopage:
		m->m_len = MIN(MLEN, len);
		m->m_off = MMINOFF;
copy:
		bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
		cp += m->m_len;
nocopy:
		*mp = m;
		mp = &m->m_next;
		if (off) {
			/* sort of an ALGOL-W style for statement... */
			off += m->m_len;
			if (off == totlen) {
				cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
				off = 0;
				totlen = off0;
			}
		} else
			totlen -= m->m_len;
	}
	return (top);
bad:
	m_freem(top);
	return (0);
}

/*
 * Map a chain of mbufs onto a network interface
 * in preparation for an i/o operation.
 * The argument chain of mbufs includes the local network
 * header which is copied to be in the mapped, aligned
 * i/o space.
 */
if_wubaput(ifu, m)
	register struct ifuba *ifu;
	register struct mbuf *m;
{
	register struct mbuf *mp;
	register caddr_t cp, dp;
	register int i;
	int xswapd = 0;
	int x, cc;

	cp = ifu->ifu_w.ifrw_addr;
	while (m) {
		dp = mtod(m, char *);
		if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) {
			struct pte *pte; int *ip;
			pte = &Mbmap[mtocl(dp)*CLSIZE];
			x = btop(cp - ifu->ifu_w.ifrw_addr);
			ip = (int *)&ifu->ifu_w.ifrw_mr[x];
			for (i = 0; i < CLSIZE; i++)
				*ip++ =
				    ifu->ifu_w.ifrw_proto | pte++->pg_pfnum;
			xswapd |= 1 << (x>>(CLSHIFT-PGSHIFT));
			mp = m->m_next;
			m->m_next = ifu->ifu_xtofree;
			ifu->ifu_xtofree = m;
			cp += m->m_len;
		} else {
			bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
			cp += m->m_len;
			MFREE(m, mp);
		}
		m = mp;
	}

	/*
	 * Xswapd is the set of clusters we just mapped out.  Ifu->ifu_xswapd
	 * is the set of clusters mapped out from before.  We compute
	 * the number of clusters involved in this operation in x.
	 * Clusters mapped out before and involved in this operation
	 * should be unmapped so original pages will be accessed by the device.
	 */
	cc = cp - ifu->ifu_w.ifrw_addr;
	x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT;
	ifu->ifu_xswapd &= ~xswapd;
	xswapd &= ~ifu->ifu_xswapd;
	while (i = ffs(ifu->ifu_xswapd)) {
		i--;
		if (i >= x)
			break;
		ifu->ifu_xswapd &= ~(1<<i);
		i *= CLSIZE;
		for (x = 0; x < CLSIZE; x++) {
			ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i];
			i++;
		}
	}
	ifu->ifu_xswapd |= xswapd;
	return (cc);
}
Commit	Line	Data
	1	/* if_uba.c 4.16 82/12/17 */
	2
	3	#include "../machine/pte.h"
	4
	5	#include "../h/param.h"
	6	#include "../h/systm.h"
	7	#include "../h/mbuf.h"
	8	#include "../h/map.h"
	9	#include "../h/buf.h"
	10	#include "../h/cmap.h"
	11	#include "../h/vmmac.h"
	12	#include "../h/socket.h"
	13
	14	#include "../net/if.h"
	15
	16	#include "../vax/mtpr.h"
	17	#include "../vaxif/if_uba.h"
	18	#include "../vaxuba/ubareg.h"
	19	#include "../vaxuba/ubavar.h"
	20
	21	/*
	22	* Routines supporting UNIBUS network interfaces.
	23	*
	24	* TODO:
	25	* Support interfaces using only one BDP statically.
	26	*/
	27
	28	/*
	29	* Init UNIBUS for interface on uban whose headers of size hlen are to
	30	* end on a page boundary. We allocate a UNIBUS map register for the page
	31	* with the header, and nmr more UNIBUS map registers for i/o on the adapter,
	32	* doing this twice: once for reading and once for writing. We also
	33	* allocate page frames in the mbuffer pool for these pages.
	34	*/
	35	if_ubainit(ifu, uban, hlen, nmr)
	36	register struct ifuba *ifu;
	37	int uban, hlen, nmr;
	38	{
	39	register caddr_t cp;
	40	int i, ncl;
	41
	42	ncl = clrnd(nmr + CLSIZE) / CLSIZE;
	43	if (ifu->ifu_r.ifrw_addr)
	44	cp = ifu->ifu_r.ifrw_addr - (CLBYTES - hlen);
	45	else {
	46	cp = m_clalloc(2 * ncl, MPG_SPACE);
	47	if (cp == 0)
	48	return (0);
	49	ifu->ifu_r.ifrw_addr = cp + CLBYTES - hlen;
	50	ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES;
	51	ifu->ifu_hlen = hlen;
	52	ifu->ifu_uban = uban;
	53	ifu->ifu_uba = uba_hd[uban].uh_uba;
	54	}
	55	if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0)
	56	goto bad;
	57	if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0)
	58	goto bad2;
	59	for (i = 0; i < nmr; i++)
	60	ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i];
	61	ifu->ifu_xswapd = 0;
	62	return (1);
	63	bad2:
	64	ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info);
	65	bad:
	66	m_pgfree(cp, 2 * ncl);
	67	ifu->ifu_r.ifrw_addr = 0;
	68	return (0);
	69	}
	70
	71	/*
	72	* Setup either a ifrw structure by allocating UNIBUS map registers,
	73	* possibly a buffered data path, and initializing the fields of
	74	* the ifrw structure to minimize run-time overhead.
	75	*/
	76	static
	77	if_ubaalloc(ifu, ifrw, nmr)
	78	struct ifuba *ifu;
	79	register struct ifrw *ifrw;
	80	int nmr;
	81	{
	82	register int info;
	83
	84	info =
	85	uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen,
	86	ifu->ifu_flags);
	87	if (info == 0)
	88	return (0);
	89	ifrw->ifrw_info = info;
	90	ifrw->ifrw_bdp = UBAI_BDP(info);
	91	ifrw->ifrw_proto = UBAMR_MRV \| (UBAI_BDP(info) << UBAMR_DPSHIFT);
	92	ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + 1];
	93	return (1);
	94	}
	95
	96	/*
	97	* Pull read data off a interface.
	98	* Len is length of data, with local net header stripped.
	99	* Off is non-zero if a trailer protocol was used, and
	100	* gives the offset of the trailer information.
	101	* We copy the trailer information and then all the normal
	102	* data into mbufs. When full cluster sized units are present
	103	* on the interface on cluster boundaries we can get them more
	104	* easily by remapping, and take advantage of this here.
	105	*/
	106	struct mbuf *
	107	if_rubaget(ifu, totlen, off0)
	108	register struct ifuba *ifu;
	109	int totlen, off0;
	110	{
	111	struct mbuf top, mp, m;
	112	int off = off0, len;
	113	register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
	114
	115
	116	top = 0;
	117	mp = &top;
	118	while (totlen > 0) {
	119	MGET(m, M_DONTWAIT, MT_DATA);
	120	if (m == 0)
	121	goto bad;
	122	if (off) {
	123	len = totlen - off;
	124	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off;
	125	} else
	126	len = totlen;
	127	if (len >= CLBYTES) {
	128	struct mbuf *p;
	129	struct pte cpte, ppte;
	130	int x, *ip, i;
	131
	132	MCLGET(p, 1);
	133	if (p == 0)
	134	goto nopage;
	135	len = m->m_len = CLBYTES;
	136	m->m_off = (int)p - (int)m;
	137	if (!claligned(cp))
	138	goto copy;
	139
	140	/*
	141	* Switch pages mapped to UNIBUS with new page p,
	142	* as quick form of copy. Remap UNIBUS and invalidate.
	143	*/
	144	cpte = &Mbmap[mtocl(cp)*CLSIZE];
	145	ppte = &Mbmap[mtocl(p)*CLSIZE];
	146	x = btop(cp - ifu->ifu_r.ifrw_addr);
	147	ip = (int *)&ifu->ifu_r.ifrw_mr[x];
	148	for (i = 0; i < CLSIZE; i++) {
	149	struct pte t;
	150	t = ppte; ppte++ = cpte; cpte = t;
	151	*ip++ =
	152	cpte++->pg_pfnum\|ifu->ifu_r.ifrw_proto;
	153	mtpr(TBIS, cp);
	154	cp += NBPG;
	155	mtpr(TBIS, (caddr_t)p);
	156	p += NBPG / sizeof (*p);
	157	}
	158	goto nocopy;
	159	}
	160	nopage:
	161	m->m_len = MIN(MLEN, len);
	162	m->m_off = MMINOFF;
	163	copy:
	164	bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
	165	cp += m->m_len;
	166	nocopy:
	167	*mp = m;
	168	mp = &m->m_next;
	169	if (off) {
	170	/* sort of an ALGOL-W style for statement... */
	171	off += m->m_len;
	172	if (off == totlen) {
	173	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
	174	off = 0;
	175	totlen = off0;
	176	}
	177	} else
	178	totlen -= m->m_len;
	179	}
	180	return (top);
	181	bad:
	182	m_freem(top);
	183	return (0);
	184	}
	185
	186	/*
	187	* Map a chain of mbufs onto a network interface
	188	* in preparation for an i/o operation.
	189	* The argument chain of mbufs includes the local network
	190	* header which is copied to be in the mapped, aligned
	191	* i/o space.
	192	*/
	193	if_wubaput(ifu, m)
	194	register struct ifuba *ifu;
	195	register struct mbuf *m;
	196	{
	197	register struct mbuf *mp;
	198	register caddr_t cp, dp;
	199	register int i;
	200	int xswapd = 0;
	201	int x, cc;
	202
	203	cp = ifu->ifu_w.ifrw_addr;
	204	while (m) {
	205	dp = mtod(m, char *);
	206	if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) {
	207	struct pte pte; int ip;
	208	pte = &Mbmap[mtocl(dp)*CLSIZE];
	209	x = btop(cp - ifu->ifu_w.ifrw_addr);
	210	ip = (int *)&ifu->ifu_w.ifrw_mr[x];
	211	for (i = 0; i < CLSIZE; i++)
	212	*ip++ =
	213	ifu->ifu_w.ifrw_proto \| pte++->pg_pfnum;
	214	xswapd \|= 1 << (x>>(CLSHIFT-PGSHIFT));
	215	mp = m->m_next;
	216	m->m_next = ifu->ifu_xtofree;
	217	ifu->ifu_xtofree = m;
	218	cp += m->m_len;
	219	} else {
	220	bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
	221	cp += m->m_len;
	222	MFREE(m, mp);
	223	}
	224	m = mp;
	225	}
	226
	227	/*
	228	* Xswapd is the set of clusters we just mapped out. Ifu->ifu_xswapd
	229	* is the set of clusters mapped out from before. We compute
	230	* the number of clusters involved in this operation in x.
	231	* Clusters mapped out before and involved in this operation
	232	* should be unmapped so original pages will be accessed by the device.
	233	*/
	234	cc = cp - ifu->ifu_w.ifrw_addr;
	235	x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT;
	236	ifu->ifu_xswapd &= ~xswapd;
	237	xswapd &= ~ifu->ifu_xswapd;
	238	while (i = ffs(ifu->ifu_xswapd)) {
	239	i--;
	240	if (i >= x)
	241	break;
	242	ifu->ifu_xswapd &= ~(1<<i);
	243	i *= CLSIZE;
	244	for (x = 0; x < CLSIZE; x++) {
	245	ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i];
	246	i++;
	247	}
	248	}
	249	ifu->ifu_xswapd \|= xswapd;
	250	return (cc);
	251	}