[unix-history] / usr / src / sys / vax / if / if_uba.c

/*	if_uba.c	4.11	82/05/19	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/map.h"
#include "../h/pte.h"
#include "../h/buf.h"
#include "../h/ubareg.h"
#include "../h/ubavar.h"
#include "../h/cmap.h"
#include "../h/mtpr.h"
#include "../h/vmmac.h"
#include "../h/socket.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/if_uba.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;

COUNT(IF_UBAINIT);
	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;

COUNT(IF_UBAALLOC);
	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;

COUNT(IF_RUBAGET);

	top = 0;
	mp = &top;
	while (totlen > 0) {
		MGET(m, 0);
		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;

COUNT(IF_WUBAPUT);
	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
176c481f	1	/* if_uba.c 4.11 82/05/19 */
0468e5fa BJ	2
	3	#include "../h/param.h"
	4	#include "../h/systm.h"
	5	#include "../h/mbuf.h"
	6	#include "../h/map.h"
	7	#include "../h/pte.h"
8a13b737	8	#include "../h/buf.h"
0468e5fa BJ	9	#include "../h/ubareg.h"
	10	#include "../h/ubavar.h"
	11	#include "../h/cmap.h"
	12	#include "../h/mtpr.h"
8a13b737	13	#include "../h/vmmac.h"
ee787340	14	#include "../h/socket.h"
8a13b737 BJ	15	#include "../net/in.h"
	16	#include "../net/in_systm.h"
	17	#include "../net/if.h"
0468e5fa BJ	18	#include "../net/if_uba.h"
	19
	20	/*
	21	* Routines supporting UNIBUS network interfaces.
	22	*
	23	* TODO:
	24	* Support interfaces using only one BDP statically.
	25	*/
	26
	27	/*
	28	* Init UNIBUS for interface on uban whose headers of size hlen are to
	29	* end on a page boundary. We allocate a UNIBUS map register for the page
	30	* with the header, and nmr more UNIBUS map registers for i/o on the adapter,
	31	* doing this twice: once for reading and once for writing. We also
	32	* allocate page frames in the mbuffer pool for these pages.
	33	*/
	34	if_ubainit(ifu, uban, hlen, nmr)
	35	register struct ifuba *ifu;
	36	int uban, hlen, nmr;
	37	{
97da2a42 BJ	38	register caddr_t cp;
97da2a42 BJ	39	int i, ncl;
0468e5fa	40
8a13b737	41	COUNT(IF_UBAINIT);
97da2a42	42	ncl = clrnd(nmr + CLSIZE) / CLSIZE;
176c481f BJ	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	}
b454c3ea	55	if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0)
0468e5fa	56	goto bad;
b454c3ea	57	if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0)
0468e5fa	58	goto bad2;
b454c3ea	59	for (i = 0; i < nmr; i++)
97da2a42	60	ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i];
8a13b737	61	ifu->ifu_xswapd = 0;
0468e5fa BJ	62	return (1);
0468e5fa BJ	63	bad2:
8a13b737	64	ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info);
0468e5fa	65	bad:
97da2a42	66	m_pgfree(cp, 2 * ncl);
176c481f	67	ifu->ifu_r.ifrw_addr = 0;
0468e5fa BJ	68	return (0);
	69	}
	70
	71	/*
	72	* Setup either a ifrw structure by allocating UNIBUS map registers,
d6391cba SL	73	* possibly a buffered data path, and initializing the fields of
d6391cba SL	74	* the ifrw structure to minimize run-time overhead.
0468e5fa BJ	75	*/
0468e5fa BJ	76	static
b454c3ea	77	if_ubaalloc(ifu, ifrw, nmr)
0468e5fa BJ	78	struct ifuba *ifu;
0468e5fa BJ	79	register struct ifrw *ifrw;
b454c3ea	80	int nmr;
0468e5fa BJ	81	{
	82	register int info;
	83
8a13b737	84	COUNT(IF_UBAALLOC);
0468e5fa	85	info =
b454c3ea	86	uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen,
d6391cba	87	ifu->ifu_flags);
0468e5fa	88	if (info == 0)
8a13b737	89	return (0);
0468e5fa BJ	90	ifrw->ifrw_info = info;
0468e5fa BJ	91	ifrw->ifrw_bdp = UBAI_BDP(info);
97da2a42	92	ifrw->ifrw_proto = UBAMR_MRV \| (UBAI_BDP(info) << UBAMR_DPSHIFT);
8a13b737 BJ	93	ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + 1];
8a13b737 BJ	94	return (1);
0468e5fa BJ	95	}
	96
	97	/*
f1b2fa5b BJ	98	* Pull read data off a interface.
	99	* Len is length of data, with local net header stripped.
	100	* Off is non-zero if a trailer protocol was used, and
	101	* gives the offset of the trailer information.
	102	* We copy the trailer information and then all the normal
	103	* data into mbufs. When full cluster sized units are present
	104	* on the interface on cluster boundaries we can get them more
	105	* easily by remapping, and take advantage of this here.
0468e5fa BJ	106	*/
0468e5fa BJ	107	struct mbuf *
f1b2fa5b	108	if_rubaget(ifu, totlen, off0)
0468e5fa	109	register struct ifuba *ifu;
f1b2fa5b	110	int totlen, off0;
0468e5fa	111	{
b454c3ea BJ	112	struct mbuf top, mp, m;
b454c3ea BJ	113	int off = off0, len;
97da2a42	114	register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
0468e5fa	115
8a13b737	116	COUNT(IF_RUBAGET);
0468e5fa	117
f1b2fa5b BJ	118	top = 0;
	119	mp = &top;
	120	while (totlen > 0) {
0468e5fa BJ	121	MGET(m, 0);
0468e5fa BJ	122	if (m == 0)
8a13b737	123	goto bad;
f1b2fa5b BJ	124	if (off) {
	125	len = totlen - off;
	126	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off;
	127	} else
	128	len = totlen;
97da2a42	129	if (len >= CLBYTES) {
b454c3ea	130	struct mbuf *p;
0468e5fa	131	struct pte cpte, ppte;
b454c3ea	132	int x, *ip, i;
0468e5fa BJ	133
	134	MCLGET(p, 1);
	135	if (p == 0)
	136	goto nopage;
97da2a42	137	len = m->m_len = CLBYTES;
0468e5fa	138	m->m_off = (int)p - (int)m;
b454c3ea	139	if (!claligned(cp))
0468e5fa BJ	140	goto copy;
	141
	142	/*
b454c3ea BJ	143	* Switch pages mapped to UNIBUS with new page p,
b454c3ea BJ	144	* as quick form of copy. Remap UNIBUS and invalidate.
0468e5fa	145	*/
b454c3ea BJ	146	cpte = &Mbmap[mtocl(cp)*CLSIZE];
b454c3ea BJ	147	ppte = &Mbmap[mtocl(p)*CLSIZE];
8a13b737	148	x = btop(cp - ifu->ifu_r.ifrw_addr);
97da2a42	149	ip = (int *)&ifu->ifu_r.ifrw_mr[x];
0468e5fa BJ	150	for (i = 0; i < CLSIZE; i++) {
0468e5fa BJ	151	struct pte t;
b454c3ea	152	t = ppte; ppte++ = cpte; cpte = t;
0468e5fa	153	*ip++ =
8a13b737	154	cpte++->pg_pfnum\|ifu->ifu_r.ifrw_proto;
0468e5fa	155	mtpr(TBIS, cp);
8a13b737	156	cp += NBPG;
0468e5fa	157	mtpr(TBIS, (caddr_t)p);
8a13b737	158	p += NBPG / sizeof (*p);
0468e5fa BJ	159	}
	160	goto nocopy;
	161	}
	162	nopage:
	163	m->m_len = MIN(MLEN, len);
	164	m->m_off = MMINOFF;
	165	copy:
	166	bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
	167	cp += m->m_len;
	168	nocopy:
f1b2fa5b BJ	169	*mp = m;
	170	mp = &m->m_next;
	171	if (off) {
b454c3ea	172	/* sort of an ALGOL-W style for statement... */
f1b2fa5b BJ	173	off += m->m_len;
	174	if (off == totlen) {
	175	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
	176	off = 0;
97da2a42	177	totlen = off0;
f1b2fa5b	178	}
97da2a42	179	} else
c7a4fdbf	180	totlen -= m->m_len;
0468e5fa BJ	181	}
	182	return (top);
	183	bad:
	184	m_freem(top);
	185	return (0);
	186	}
	187
	188	/*
	189	* Map a chain of mbufs onto a network interface
	190	* in preparation for an i/o operation.
	191	* The argument chain of mbufs includes the local network
	192	* header which is copied to be in the mapped, aligned
	193	* i/o space.
	194	*/
	195	if_wubaput(ifu, m)
	196	register struct ifuba *ifu;
	197	register struct mbuf *m;
	198	{
	199	register struct mbuf *mp;
	200	register caddr_t cp, dp;
	201	register int i;
b454c3ea BJ	202	int xswapd = 0;
b454c3ea BJ	203	int x, cc;
0468e5fa	204
8a13b737	205	COUNT(IF_WUBAPUT);
0468e5fa BJ	206	cp = ifu->ifu_w.ifrw_addr;
	207	while (m) {
	208	dp = mtod(m, char *);
97da2a42	209	if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) {
0468e5fa	210	struct pte pte; int ip;
b454c3ea	211	pte = &Mbmap[mtocl(dp)*CLSIZE];
0468e5fa	212	x = btop(cp - ifu->ifu_w.ifrw_addr);
97da2a42	213	ip = (int *)&ifu->ifu_w.ifrw_mr[x];
0468e5fa BJ	214	for (i = 0; i < CLSIZE; i++)
	215	*ip++ =
	216	ifu->ifu_w.ifrw_proto \| pte++->pg_pfnum;
97da2a42	217	xswapd \|= 1 << (x>>(CLSHIFT-PGSHIFT));
b454c3ea BJ	218	mp = m->m_next;
	219	m->m_next = ifu->ifu_xtofree;
	220	ifu->ifu_xtofree = m;
	221	cp += m->m_len;
	222	} else {
0468e5fa	223	bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
b454c3ea BJ	224	cp += m->m_len;
	225	MFREE(m, mp);
	226	}
0468e5fa BJ	227	m = mp;
0468e5fa BJ	228	}
b454c3ea BJ	229
	230	/*
	231	* Xswapd is the set of clusters we just mapped out. Ifu->ifu_xswapd
	232	* is the set of clusters mapped out from before. We compute
	233	* the number of clusters involved in this operation in x.
	234	* Clusters mapped out before and involved in this operation
	235	* should be unmapped so original pages will be accessed by the device.
	236	*/
	237	cc = cp - ifu->ifu_w.ifrw_addr;
	238	x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT;
97da2a42	239	ifu->ifu_xswapd &= ~xswapd;
0468e5fa	240	xswapd &= ~ifu->ifu_xswapd;
97da2a42 BJ	241	while (i = ffs(ifu->ifu_xswapd)) {
	242	i--;
	243	if (i >= x)
	244	break;
	245	ifu->ifu_xswapd &= ~(1<<i);
	246	i *= CLSIZE;
	247	for (x = 0; x < CLSIZE; x++) {
	248	ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i];
	249	i++;
0468e5fa	250	}
97da2a42	251	}
b454c3ea BJ	252	ifu->ifu_xswapd \|= xswapd;
b454c3ea BJ	253	return (cc);
0468e5fa	254	}