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

/*	if_uba.c	4.8	81/12/23	*/

#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 "../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;
	cp = m_clalloc(2 * ncl, MPG_SPACE);
	if (cp == 0)
		return (0);
	ifu->ifu_hlen = hlen;
	ifu->ifu_uban = uban;
	ifu->ifu_uba = uba_hd[uban].uh_uba;
	ifu->ifu_r.ifrw_addr = cp + CLBYTES - hlen;
	ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES;
	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);
	return (0);
}

/*
 * Setup either a ifrw structure by allocating UNIBUS map registers,
 * 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,
	        UBA_NEED16|UBA_NEEDBDP);
	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
c7a4fdbf	1	/* if_uba.c 4.8 81/12/23 */
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 BJ	13	#include "../h/vmmac.h"
	14	#include "../net/in.h"
	15	#include "../net/in_systm.h"
	16	#include "../net/if.h"
0468e5fa BJ	17	#include "../net/if_uba.h"
	18
	19	/*
	20	* Routines supporting UNIBUS network interfaces.
	21	*
	22	* TODO:
	23	* Support interfaces using only one BDP statically.
	24	*/
	25
	26	/*
	27	* Init UNIBUS for interface on uban whose headers of size hlen are to
	28	* end on a page boundary. We allocate a UNIBUS map register for the page
	29	* with the header, and nmr more UNIBUS map registers for i/o on the adapter,
	30	* doing this twice: once for reading and once for writing. We also
	31	* allocate page frames in the mbuffer pool for these pages.
	32	*/
	33	if_ubainit(ifu, uban, hlen, nmr)
	34	register struct ifuba *ifu;
	35	int uban, hlen, nmr;
	36	{
97da2a42 BJ	37	register caddr_t cp;
97da2a42 BJ	38	int i, ncl;
0468e5fa	39
8a13b737	40	COUNT(IF_UBAINIT);
97da2a42 BJ	41	ncl = clrnd(nmr + CLSIZE) / CLSIZE;
97da2a42 BJ	42	cp = m_clalloc(2 * ncl, MPG_SPACE);
0468e5fa BJ	43	if (cp == 0)
0468e5fa BJ	44	return (0);
b454c3ea	45	ifu->ifu_hlen = hlen;
8a13b737 BJ	46	ifu->ifu_uban = uban;
8a13b737 BJ	47	ifu->ifu_uba = uba_hd[uban].uh_uba;
97da2a42 BJ	48	ifu->ifu_r.ifrw_addr = cp + CLBYTES - hlen;
97da2a42 BJ	49	ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES;
b454c3ea	50	if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0)
0468e5fa	51	goto bad;
b454c3ea	52	if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0)
0468e5fa	53	goto bad2;
b454c3ea	54	for (i = 0; i < nmr; i++)
97da2a42	55	ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i];
8a13b737	56	ifu->ifu_xswapd = 0;
0468e5fa BJ	57	return (1);
0468e5fa BJ	58	bad2:
8a13b737	59	ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info);
0468e5fa	60	bad:
97da2a42	61	m_pgfree(cp, 2 * ncl);
0468e5fa BJ	62	return (0);
	63	}
	64
	65	/*
	66	* Setup either a ifrw structure by allocating UNIBUS map registers,
	67	* a buffered data path, and initializing the fields of the ifrw structure
	68	* to minimize run-time overhead.
	69	*/
	70	static
b454c3ea	71	if_ubaalloc(ifu, ifrw, nmr)
0468e5fa BJ	72	struct ifuba *ifu;
0468e5fa BJ	73	register struct ifrw *ifrw;
b454c3ea	74	int nmr;
0468e5fa BJ	75	{
	76	register int info;
	77
8a13b737	78	COUNT(IF_UBAALLOC);
0468e5fa	79	info =
b454c3ea	80	uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen,
0468e5fa BJ	81	UBA_NEED16\|UBA_NEEDBDP);
0468e5fa BJ	82	if (info == 0)
8a13b737	83	return (0);
0468e5fa BJ	84	ifrw->ifrw_info = info;
0468e5fa BJ	85	ifrw->ifrw_bdp = UBAI_BDP(info);
97da2a42	86	ifrw->ifrw_proto = UBAMR_MRV \| (UBAI_BDP(info) << UBAMR_DPSHIFT);
8a13b737 BJ	87	ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + 1];
8a13b737 BJ	88	return (1);
0468e5fa BJ	89	}
	90
	91	/*
f1b2fa5b BJ	92	* Pull read data off a interface.
	93	* Len is length of data, with local net header stripped.
	94	* Off is non-zero if a trailer protocol was used, and
	95	* gives the offset of the trailer information.
	96	* We copy the trailer information and then all the normal
	97	* data into mbufs. When full cluster sized units are present
	98	* on the interface on cluster boundaries we can get them more
	99	* easily by remapping, and take advantage of this here.
0468e5fa BJ	100	*/
0468e5fa BJ	101	struct mbuf *
f1b2fa5b	102	if_rubaget(ifu, totlen, off0)
0468e5fa	103	register struct ifuba *ifu;
f1b2fa5b	104	int totlen, off0;
0468e5fa	105	{
b454c3ea BJ	106	struct mbuf top, mp, m;
b454c3ea BJ	107	int off = off0, len;
97da2a42	108	register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
0468e5fa	109
8a13b737	110	COUNT(IF_RUBAGET);
0468e5fa	111
f1b2fa5b BJ	112	top = 0;
	113	mp = &top;
	114	while (totlen > 0) {
0468e5fa BJ	115	MGET(m, 0);
0468e5fa BJ	116	if (m == 0)
8a13b737	117	goto bad;
f1b2fa5b BJ	118	if (off) {
	119	len = totlen - off;
	120	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off;
	121	} else
	122	len = totlen;
97da2a42	123	if (len >= CLBYTES) {
b454c3ea	124	struct mbuf *p;
0468e5fa	125	struct pte cpte, ppte;
b454c3ea	126	int x, *ip, i;
0468e5fa BJ	127
	128	MCLGET(p, 1);
	129	if (p == 0)
	130	goto nopage;
97da2a42	131	len = m->m_len = CLBYTES;
0468e5fa	132	m->m_off = (int)p - (int)m;
b454c3ea	133	if (!claligned(cp))
0468e5fa BJ	134	goto copy;
	135
	136	/*
b454c3ea BJ	137	* Switch pages mapped to UNIBUS with new page p,
b454c3ea BJ	138	* as quick form of copy. Remap UNIBUS and invalidate.
0468e5fa	139	*/
b454c3ea BJ	140	cpte = &Mbmap[mtocl(cp)*CLSIZE];
b454c3ea BJ	141	ppte = &Mbmap[mtocl(p)*CLSIZE];
8a13b737	142	x = btop(cp - ifu->ifu_r.ifrw_addr);
97da2a42	143	ip = (int *)&ifu->ifu_r.ifrw_mr[x];
0468e5fa BJ	144	for (i = 0; i < CLSIZE; i++) {
0468e5fa BJ	145	struct pte t;
b454c3ea	146	t = ppte; ppte++ = cpte; cpte = t;
0468e5fa	147	*ip++ =
8a13b737	148	cpte++->pg_pfnum\|ifu->ifu_r.ifrw_proto;
0468e5fa	149	mtpr(TBIS, cp);
8a13b737	150	cp += NBPG;
0468e5fa	151	mtpr(TBIS, (caddr_t)p);
8a13b737	152	p += NBPG / sizeof (*p);
0468e5fa BJ	153	}
	154	goto nocopy;
	155	}
	156	nopage:
	157	m->m_len = MIN(MLEN, len);
	158	m->m_off = MMINOFF;
	159	copy:
	160	bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
	161	cp += m->m_len;
	162	nocopy:
f1b2fa5b BJ	163	*mp = m;
	164	mp = &m->m_next;
	165	if (off) {
b454c3ea	166	/* sort of an ALGOL-W style for statement... */
f1b2fa5b BJ	167	off += m->m_len;
	168	if (off == totlen) {
	169	cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
	170	off = 0;
97da2a42	171	totlen = off0;
f1b2fa5b	172	}
97da2a42	173	} else
c7a4fdbf	174	totlen -= m->m_len;
0468e5fa BJ	175	}
	176	return (top);
	177	bad:
	178	m_freem(top);
	179	return (0);
	180	}
	181
	182	/*
	183	* Map a chain of mbufs onto a network interface
	184	* in preparation for an i/o operation.
	185	* The argument chain of mbufs includes the local network
	186	* header which is copied to be in the mapped, aligned
	187	* i/o space.
	188	*/
	189	if_wubaput(ifu, m)
	190	register struct ifuba *ifu;
	191	register struct mbuf *m;
	192	{
	193	register struct mbuf *mp;
	194	register caddr_t cp, dp;
	195	register int i;
b454c3ea BJ	196	int xswapd = 0;
b454c3ea BJ	197	int x, cc;
0468e5fa	198
8a13b737	199	COUNT(IF_WUBAPUT);
0468e5fa BJ	200	cp = ifu->ifu_w.ifrw_addr;
	201	while (m) {
	202	dp = mtod(m, char *);
97da2a42	203	if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) {
0468e5fa	204	struct pte pte; int ip;
b454c3ea	205	pte = &Mbmap[mtocl(dp)*CLSIZE];
0468e5fa	206	x = btop(cp - ifu->ifu_w.ifrw_addr);
97da2a42	207	ip = (int *)&ifu->ifu_w.ifrw_mr[x];
0468e5fa BJ	208	for (i = 0; i < CLSIZE; i++)
	209	*ip++ =
	210	ifu->ifu_w.ifrw_proto \| pte++->pg_pfnum;
97da2a42	211	xswapd \|= 1 << (x>>(CLSHIFT-PGSHIFT));
b454c3ea BJ	212	mp = m->m_next;
	213	m->m_next = ifu->ifu_xtofree;
	214	ifu->ifu_xtofree = m;
	215	cp += m->m_len;
	216	} else {
0468e5fa	217	bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
b454c3ea BJ	218	cp += m->m_len;
	219	MFREE(m, mp);
	220	}
0468e5fa BJ	221	m = mp;
0468e5fa BJ	222	}
b454c3ea BJ	223
	224	/*
	225	* Xswapd is the set of clusters we just mapped out. Ifu->ifu_xswapd
	226	* is the set of clusters mapped out from before. We compute
	227	* the number of clusters involved in this operation in x.
	228	* Clusters mapped out before and involved in this operation
	229	* should be unmapped so original pages will be accessed by the device.
	230	*/
	231	cc = cp - ifu->ifu_w.ifrw_addr;
	232	x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT;
97da2a42	233	ifu->ifu_xswapd &= ~xswapd;
0468e5fa	234	xswapd &= ~ifu->ifu_xswapd;
97da2a42 BJ	235	while (i = ffs(ifu->ifu_xswapd)) {
	236	i--;
	237	if (i >= x)
	238	break;
	239	ifu->ifu_xswapd &= ~(1<<i);
	240	i *= CLSIZE;
	241	for (x = 0; x < CLSIZE; x++) {
	242	ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i];
	243	i++;
0468e5fa	244	}
97da2a42	245	}
b454c3ea BJ	246	ifu->ifu_xswapd \|= xswapd;
b454c3ea BJ	247	return (cc);
0468e5fa	248	}