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

/*      if_css.c     4.4     82/10/23     */

#include "css.h"

/*
 * DEC/CSS IMP11-A ARPAnet IMP interface driver.
 * Since "imp11a" is such a mouthful, it is called
 * "css" after the LH/DH being called "acc".
 *
 * Configuration notes:
 *
 * As delivered from DEC/CSS, it
 * is addressed and vectored as two DR11-B's.  This makes
 * Autoconfig almost IMPOSSIBLE.  To make it work, the
 * interrupt vectors must be restrapped to make the vectors
 * consecutive.  The 020 hole between the CSR addresses is
 * tolerated, althought that could be cleaned-up also.
 *
 * Additionally, the TRANSMIT side of the IMP11-A has the
 * lower address of the two subunits, so the vector ordering
 * in the CONFIG file is reversed from most other devices.
 * It should be:
 *
 * device css0 ....  cssxint cssrint
 *
 * If you get it wrong, it will still autoconfig, but will just
 * sit there with RECIEVE IDLE indicated on the front panel.
 */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/pte.h"
#include "../h/buf.h"
#include "../h/protosw.h"
#include "../h/socket.h"
#include "../h/vmmac.h"

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

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

int     cssprobe(), cssattach(), cssrint(), cssxint();
struct  uba_device *cssinfo[NCSS];
u_short cssstd[] = { 0 };
struct  uba_driver cssdriver =
        { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
#define CSSUNIT(x)      minor(x)

int     cssinit(), cssstart(), cssreset();

/*
 * "Lower half" of IMP interface driver.
 *
 * Each IMP interface is handled by a common module which handles
 * the IMP-host protocol and a hardware driver which manages the
 * hardware specific details of talking with the IMP.
 *
 * The hardware portion of the IMP driver handles DMA and related
 * management of UNIBUS resources.  The IMP protocol module interprets
 * contents of these messages and "controls" the actions of the
 * hardware module during IMP resets, but not, for instance, during
 * UNIBUS resets.
 *
 * The two modules are coupled at "attach time", and ever after,
 * through the imp interface structure.  Higher level protocols,
 * e.g. IP, interact with the IMP driver, rather than the CSS.
 */
struct  css_softc {
        struct  ifnet *css_if;          /* pointer to IMP's ifnet struct */
        struct  impcb *css_ic;          /* data structure shared with IMP */
        struct  ifuba css_ifuba;        /* UNIBUS resources */
        struct  mbuf *css_iq;           /* input reassembly queue */
        short   css_olen;               /* size of last message sent */
        char    css_flush;              /* flush remainder of message */
} css_softc[NCSS];

/*
 * Reset the IMP and cause a transmitter interrupt by
 * performing a null DMA.
 */
cssprobe(reg)
        caddr_t reg;
{
        register int br, cvec;          /* r11, r10 value-result */
        register struct cssdevice *addr = (struct cssdevice *)reg;

COUNT(CSSPROBE);
#ifdef lint
        br = 0; cvec = br; br = cvec;
        cssrint(0); cssxint(0);
#endif


        addr->css_icsr = CSS_CLR;
        addr->css_ocsr = CSS_CLR;
        DELAY(50000);
	addr->css_icsr = 0;
	addr->css_ocsr = 0;
        DELAY(50000);

	addr->css_oba = 0;
	addr->css_owc = -1;
        addr->css_ocsr = CSS_IE | CSS_GO;	/* enable interrupts */
        DELAY(50000);
        addr->css_ocsr = 0;

        return (1);
}

/*
 * Call the IMP module to allow it to set up its internal
 * state, then tie the two modules together by setting up
 * the back pointers to common data structures.
 */
cssattach(ui)
        struct uba_device *ui;
{
        register struct css_softc *sc = &css_softc[ui->ui_unit];
        register struct impcb *ip;
        struct ifimpcb {
                struct  ifnet ifimp_if;
                struct  impcb ifimp_impcb;
        } *ifimp;

COUNT(CSSATTACH);
        if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
                panic("cssattach");             /* XXX */
        sc->css_if = &ifimp->ifimp_if;
        ip = &ifimp->ifimp_impcb;
        sc->css_ic = ip;
        ip->ic_init = cssinit;
        ip->ic_start = cssstart;
	sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
#ifdef notdef
	sc->css_ifuba.ifu_flags =| UBA_NEEDBDP;
#endif
}

/*
 * Reset interface after UNIBUS reset.
 * If interface is on specified uba, reset its state.
 */
cssreset(unit, uban)
        int unit, uban;
{
        register struct uba_device *ui;
        struct css_softc *sc;

COUNT(CSSCLR);
        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
            ui->ui_ubanum != uban)
                return;
        printf(" css%d", unit);
        sc = &css_softc[unit];
        /* must go through IMP to allow it to set state */
        (*sc->css_if->if_init)(unit);
}

/*
 * Initialize interface: clear recorded pending operations,
 * and retrieve, and reinitialize UNIBUS resources.
 */
cssinit(unit)
        int unit;
{       
        register struct css_softc *sc;
        register struct uba_device *ui;
        register struct cssdevice *addr;
        int x, info;

COUNT(CSSINIT);
	if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
		printf("css%d: not alive\n", unit);
		return(0);
	}
	sc = &css_softc[unit];

	/*
	 * Header length is 0 to if_ubainit since we have to pass
	 * the IMP leader up to the protocol interpretaion
	 * routines.  If we had the deader length as
	 * sizeof(struct imp_leader), then the if_ routines
	 * would assume we handle it on input and output.
	 */
	
        if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
                printf("css%d: can't initialize\n", unit);
		ui->ui_alive = 0;
		return(0);
        }
        addr = (struct cssdevice *)ui->ui_addr;

        /* reset the imp interface. */
        x = spl5();
        addr->css_icsr = CSS_CLR;
        addr->css_ocsr = CSS_CLR;
	DELAY(100);
	addr->css_icsr = 0;
	addr->css_ocsr = 0;
        addr->css_icsr = IN_HRDY;       /* close the relay */
	DELAY(5000);
        splx(x);

        /*
	 * This may hang if the imp isn't really there.
	 * Will test and verify safe operation.
	 */

	x = 500;
	while (x-- > 0) {
		if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
			break;
                addr->css_icsr = IN_HRDY;	/* close the relay */
                DELAY(5000);
        }

	if (x <= 0) {
		printf("css%d: imp doesn't respond, icsr=%b\n", unit,
			CSS_INBITS, addr->css_icsr);
		goto down;
	}

        /*
         * Put up a read.  We can't restart any outstanding writes
         * until we're back in synch with the IMP (i.e. we've flushed
         * the NOOPs it throws at us).
	 * Note: IMPMTU includes the leader.
         */

        x = spl5();
        info = sc->css_ifuba.ifu_r.ifrw_info;
        addr->css_iba = (u_short)info;
        addr->css_iwc = -(IMPMTU >> 1);
        addr->css_icsr = 
                IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        splx(x);
	return(1);

down:
	ui->ui_alive = 0;
	return(0);
}

/*
 * Start output on an interface.
 */
cssstart(dev)
        dev_t dev;
{
        int unit = CSSUNIT(dev), info;
        struct uba_device *ui = cssinfo[unit];
        register struct css_softc *sc = &css_softc[unit];
        register struct cssdevice *addr;
        struct mbuf *m;
        u_short cmd;

COUNT(CSSSTART);
        if (sc->css_ic->ic_oactive)
                goto restart;
        
        /*
         * Not already active, deqeue a request and
         * map it onto the UNIBUS.  If no more
         * requeusts, just return.
         */
        IF_DEQUEUE(&sc->css_if->if_snd, m);
        if (m == 0) {
                sc->css_ic->ic_oactive = 0;
                return;
        }
        sc->css_olen = if_wubaput(&sc->css_ifuba, m);

restart:
        /*
         * Have request mapped to UNIBUS for transmission.
         * Purge any stale data from the BDP, and start the output.
         */
	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        addr = (struct cssdevice *)ui->ui_addr;
        info = sc->css_ifuba.ifu_w.ifrw_info;
        addr->css_oba = (u_short)info;
        addr->css_owc = -((sc->css_olen + 1) >> 1);
        cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO;
        addr->css_ocsr = cmd;
        sc->css_ic->ic_oactive = 1;
}

/*
 * Output interrupt handler.
 */
cssxint(unit)
{
        register struct uba_device *ui = cssinfo[unit];
        register struct css_softc *sc = &css_softc[unit];
        register struct cssdevice *addr;

COUNT(CSSXINT);
        addr = (struct cssdevice *)ui->ui_addr;
        if (sc->css_ic->ic_oactive == 0) {
                printf("css%d: stray output interrupt csr=%b\n",
			unit, addr->css_ocsr, CSS_OUTBITS);
                return;
        }
        sc->css_if->if_opackets++;
        sc->css_ic->ic_oactive = 0;
        if (addr->css_ocsr & CSS_ERR){
                sc->css_if->if_oerrors++;
                printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
                        addr->css_ocsr, CSS_OUTBITS,
			addr->css_icsr, CSS_INBITS);
	}
	if (sc->css_ifuba.ifu_xtofree) {
		m_freem(sc->css_ifuba.ifu_xtofree);
		sc->css_ifuba.ifu_xtofree = 0;
	}
	if (sc->css_if->if_snd.ifq_head)
		cssstart(unit);
}

/*
 * Input interrupt handler
 */
cssrint(unit)
{
        register struct css_softc *sc = &css_softc[unit];
        register struct cssdevice *addr;
        register struct ifqueue *inq;
        struct mbuf *m;
        int len, info;

COUNT(CSSRINT);
        sc->css_if->if_ipackets++;

        /*
         * Purge BDP; flush message if error indicated.
         */

        addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
		UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        if (addr->css_icsr & CSS_ERR) {
                printf("css%d: recv error, csr=%b\n", unit,
                    addr->css_icsr, CSS_INBITS);
                sc->css_if->if_ierrors++;
                sc->css_flush = 1;
        }

        if (sc->css_flush) {
                if (addr->css_icsr & IN_EOM)
                        sc->css_flush = 0;
                goto setup;
        }

        len = IMPMTU + (addr->css_iwc << 1);
	if (len < 0 || len > IMPMTU) {
		printf("css%d: bad length=%d\n", len);
		sc->css_if->if_ierrors++;
		goto setup;
	}

        /*
         * The last parameter is always 0 since using
         * trailers on the ARPAnet is insane.
         */
        m = if_rubaget(&sc->css_ifuba, len, 0);
        if (m == 0)
                goto setup;
        if ((addr->css_icsr & IN_EOM) == 0) {
		if (sc->css_iq)
			m_cat(sc->css_iq, m);
		else
			sc->css_iq = m;
		goto setup;
	}
	if (sc->css_iq) {
		m_cat(sc->css_iq, m);
		m = sc->css_iq;
		sc->css_iq = 0;
        }
        impinput(unit, m);

setup:
        /*
         * Setup for next message.
         */
        info = sc->css_ifuba.ifu_r.ifrw_info;
        addr->css_iba = (u_short)info;
        addr->css_iwc = - (IMPMTU >> 1);
        addr->css_icsr =
                IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
}
Commit	Line	Data
50241bf5	1	/* if_css.c 4.4 82/10/23 */
ee6d9923 SL	2
	3	#include "css.h"
	4
	5	/*
	6	* DEC/CSS IMP11-A ARPAnet IMP interface driver.
	7	* Since "imp11a" is such a mouthful, it is called
	8	* "css" after the LH/DH being called "acc".
	9	*
	10	* Configuration notes:
	11	*
	12	* As delivered from DEC/CSS, it
	13	* is addressed and vectored as two DR11-B's. This makes
	14	* Autoconfig almost IMPOSSIBLE. To make it work, the
	15	* interrupt vectors must be restrapped to make the vectors
	16	* consecutive. The 020 hole between the CSR addresses is
	17	* tolerated, althought that could be cleaned-up also.
	18	*
	19	* Additionally, the TRANSMIT side of the IMP11-A has the
	20	* lower address of the two subunits, so the vector ordering
	21	* in the CONFIG file is reversed from most other devices.
	22	* It should be:
	23	*
	24	* device css0 .... cssxint cssrint
	25	*
	26	* If you get it wrong, it will still autoconfig, but will just
	27	* sit there with RECIEVE IDLE indicated on the front panel.
	28	*/
	29
	30	#include "../h/param.h"
	31	#include "../h/systm.h"
	32	#include "../h/mbuf.h"
	33	#include "../h/pte.h"
	34	#include "../h/buf.h"
	35	#include "../h/protosw.h"
	36	#include "../h/socket.h"
ee6d9923	37	#include "../h/vmmac.h"
a9687d27	38
ee6d9923	39	#include "../net/if.h"
d2cc167c	40	#include "../netimp/if_imp.h"
a9687d27 BJ	41
	42	#include "../vax/cpu.h"
	43	#include "../vax/mtpr.h"
	44	#include "../vaxif/if_css.h"
d2cc167c	45	#include "../vaxif/if_uba.h"
a9687d27 BJ	46	#include "../vaxuba/ubareg.h"
a9687d27 BJ	47	#include "../vaxuba/ubavar.h"
ee6d9923 SL	48
	49	int cssprobe(), cssattach(), cssrint(), cssxint();
	50	struct uba_device *cssinfo[NCSS];
	51	u_short cssstd[] = { 0 };
	52	struct uba_driver cssdriver =
	53	{ cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
	54	#define CSSUNIT(x) minor(x)
	55
	56	int cssinit(), cssstart(), cssreset();
	57
	58	/*
	59	* "Lower half" of IMP interface driver.
	60	*
	61	* Each IMP interface is handled by a common module which handles
	62	* the IMP-host protocol and a hardware driver which manages the
	63	* hardware specific details of talking with the IMP.
	64	*
	65	* The hardware portion of the IMP driver handles DMA and related
	66	* management of UNIBUS resources. The IMP protocol module interprets
	67	* contents of these messages and "controls" the actions of the
	68	* hardware module during IMP resets, but not, for instance, during
	69	* UNIBUS resets.
	70	*
	71	* The two modules are coupled at "attach time", and ever after,
	72	* through the imp interface structure. Higher level protocols,
	73	* e.g. IP, interact with the IMP driver, rather than the CSS.
	74	*/
	75	struct css_softc {
	76	struct ifnet css_if; / pointer to IMP's ifnet struct */
	77	struct impcb css_ic; / data structure shared with IMP */
	78	struct ifuba css_ifuba; /* UNIBUS resources */
	79	struct mbuf css_iq; / input reassembly queue */
	80	short css_olen; /* size of last message sent */
	81	char css_flush; /* flush remainder of message */
	82	} css_softc[NCSS];
	83
	84	/*
	85	* Reset the IMP and cause a transmitter interrupt by
	86	* performing a null DMA.
	87	*/
	88	cssprobe(reg)
	89	caddr_t reg;
	90	{
	91	register int br, cvec; /* r11, r10 value-result */
	92	register struct cssdevice addr = (struct cssdevice )reg;
	93
	94	COUNT(CSSPROBE);
	95	#ifdef lint
	96	br = 0; cvec = br; br = cvec;
	97	cssrint(0); cssxint(0);
	98	#endif
	99
	100
	101	addr->css_icsr = CSS_CLR;
	102	addr->css_ocsr = CSS_CLR;
	103	DELAY(50000);
	104	addr->css_icsr = 0;
	105	addr->css_ocsr = 0;
	106	DELAY(50000);
	107
	108	addr->css_oba = 0;
	109	addr->css_owc = -1;
	110	addr->css_ocsr = CSS_IE \| CSS_GO; /* enable interrupts */
	111	DELAY(50000);
112	addr->css_ocsr = 0;
113
114	return (1);
115	}
116
117	/*
118	* Call the IMP module to allow it to set up its internal
119	* state, then tie the two modules together by setting up
120	* the back pointers to common data structures.
121	*/
122	cssattach(ui)
123	struct uba_device *ui;
124	{
125	register struct css_softc *sc = &css_softc[ui->ui_unit];
126	register struct impcb *ip;
127	struct ifimpcb {
128	struct ifnet ifimp_if;
129	struct impcb ifimp_impcb;
130	} *ifimp;
131
132	COUNT(CSSATTACH);
50241bf5	133	if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
ee6d9923 SL	134	panic("cssattach"); /* XXX */
	135	sc->css_if = &ifimp->ifimp_if;
	136	ip = &ifimp->ifimp_impcb;
	137	sc->css_ic = ip;
	138	ip->ic_init = cssinit;
	139	ip->ic_start = cssstart;
	140	sc->css_ifuba.ifu_flags = UBA_CANTWAIT \| UBA_NEED16;
	141	#ifdef notdef
	142	sc->css_ifuba.ifu_flags =\| UBA_NEEDBDP;
	143	#endif
	144	}
	145
	146	/*
	147	* Reset interface after UNIBUS reset.
	148	* If interface is on specified uba, reset its state.
	149	*/
	150	cssreset(unit, uban)
	151	int unit, uban;
	152	{
	153	register struct uba_device *ui;
	154	struct css_softc *sc;
	155
	156	COUNT(CSSCLR);
	157	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0 \|\|
	158	ui->ui_ubanum != uban)
	159	return;
	160	printf(" css%d", unit);
	161	sc = &css_softc[unit];
	162	/* must go through IMP to allow it to set state */
	163	(*sc->css_if->if_init)(unit);
	164	}
	165
	166	/*
	167	* Initialize interface: clear recorded pending operations,
	168	* and retrieve, and reinitialize UNIBUS resources.
	169	*/
	170	cssinit(unit)
	171	int unit;
	172	{
	173	register struct css_softc *sc;
	174	register struct uba_device *ui;
	175	register struct cssdevice *addr;
	176	int x, info;
	177
	178	COUNT(CSSINIT);
	179	if (unit >= NCSS \|\| (ui = cssinfo[unit]) == 0 \|\| ui->ui_alive == 0) {
	180	printf("css%d: not alive\n", unit);
	181	return(0);
	182	}
	183	sc = &css_softc[unit];
	184
	185	/*
	186	* Header length is 0 to if_ubainit since we have to pass
	187	* the IMP leader up to the protocol interpretaion
	188	* routines. If we had the deader length as
	189	* sizeof(struct imp_leader), then the if_ routines
	190	* would assume we handle it on input and output.
	191	*/
	192
	193	if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
	194	printf("css%d: can't initialize\n", unit);
	195	ui->ui_alive = 0;
	196	return(0);
	197	}
198	addr = (struct cssdevice *)ui->ui_addr;
199
200	/* reset the imp interface. */
201	x = spl5();
202	addr->css_icsr = CSS_CLR;
203	addr->css_ocsr = CSS_CLR;
204	DELAY(100);
205	addr->css_icsr = 0;
206	addr->css_ocsr = 0;
207	addr->css_icsr = IN_HRDY; /* close the relay */
208	DELAY(5000);
209	splx(x);
210
211	/*
212	* This may hang if the imp isn't really there.
213	* Will test and verify safe operation.
214	*/
215
216	x = 500;
217	while (x-- > 0) {
218	if ((addr->css_icsr & (IN_HRDY\|IN_IMPNR)) == IN_HRDY)
219	break;
220	addr->css_icsr = IN_HRDY; /* close the relay */
221	DELAY(5000);
222	}
223
224	if (x <= 0) {
225	printf("css%d: imp doesn't respond, icsr=%b\n", unit,
226	CSS_INBITS, addr->css_icsr);
227	goto down;
228	}
229
230	/*
231	* Put up a read. We can't restart any outstanding writes
232	* until we're back in synch with the IMP (i.e. we've flushed
233	* the NOOPs it throws at us).
234	* Note: IMPMTU includes the leader.
235	*/
236
237	x = spl5();
238	info = sc->css_ifuba.ifu_r.ifrw_info;
239	addr->css_iba = (u_short)info;
240	addr->css_iwc = -(IMPMTU >> 1);
241	addr->css_icsr =
242	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
243	splx(x);
244	return(1);
245
246	down:
247	ui->ui_alive = 0;
248	return(0);
249	}
250
251	/*
252	* Start output on an interface.
253	*/
254	cssstart(dev)
255	dev_t dev;
256	{
257	int unit = CSSUNIT(dev), info;
258	struct uba_device *ui = cssinfo[unit];
259	register struct css_softc *sc = &css_softc[unit];
260	register struct cssdevice *addr;
261	struct mbuf *m;
262	u_short cmd;
263
264	COUNT(CSSSTART);
265	if (sc->css_ic->ic_oactive)
266	goto restart;
267
268	/*
269	* Not already active, deqeue a request and
270	* map it onto the UNIBUS. If no more
271	* requeusts, just return.
272	*/
273	IF_DEQUEUE(&sc->css_if->if_snd, m);
274	if (m == 0) {
275	sc->css_ic->ic_oactive = 0;
276	return;
277	}
278	sc->css_olen = if_wubaput(&sc->css_ifuba, m);
279
280	restart:
281	/*
282	* Have request mapped to UNIBUS for transmission.
283	* Purge any stale data from the BDP, and start the output.
284	*/
285	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
286	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
287	addr = (struct cssdevice *)ui->ui_addr;
288	info = sc->css_ifuba.ifu_w.ifrw_info;
289	addr->css_oba = (u_short)info;
290	addr->css_owc = -((sc->css_olen + 1) >> 1);
291	cmd = CSS_IE \| OUT_ENLB \| ((info & 0x30000) >> 12) \| CSS_GO;
292	addr->css_ocsr = cmd;
293	sc->css_ic->ic_oactive = 1;
294	}
295
296	/*
297	* Output interrupt handler.
298	*/
299	cssxint(unit)
300	{
301	register struct uba_device *ui = cssinfo[unit];
302	register struct css_softc *sc = &css_softc[unit];
303	register struct cssdevice *addr;
304
305	COUNT(CSSXINT);
306	addr = (struct cssdevice *)ui->ui_addr;
307	if (sc->css_ic->ic_oactive == 0) {
308	printf("css%d: stray output interrupt csr=%b\n",
309	unit, addr->css_ocsr, CSS_OUTBITS);
310	return;
311	}
312	sc->css_if->if_opackets++;
313	sc->css_ic->ic_oactive = 0;
314	if (addr->css_ocsr & CSS_ERR){
315	sc->css_if->if_oerrors++;
316	printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
317	addr->css_ocsr, CSS_OUTBITS,
318	addr->css_icsr, CSS_INBITS);
319	}
320	if (sc->css_ifuba.ifu_xtofree) {
321	m_freem(sc->css_ifuba.ifu_xtofree);
322	sc->css_ifuba.ifu_xtofree = 0;
323	}
324	if (sc->css_if->if_snd.ifq_head)
325	cssstart(unit);
326	}
327
328	/*
329	* Input interrupt handler
330	*/
331	cssrint(unit)
332	{
333	register struct css_softc *sc = &css_softc[unit];
334	register struct cssdevice *addr;
335	register struct ifqueue *inq;
336	struct mbuf *m;
337	int len, info;
338
339	COUNT(CSSRINT);
340	sc->css_if->if_ipackets++;
341
342	/*
343	* Purge BDP; flush message if error indicated.
344	*/
345
346	addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
347	if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
348	UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
349	if (addr->css_icsr & CSS_ERR) {
350	printf("css%d: recv error, csr=%b\n", unit,
351	addr->css_icsr, CSS_INBITS);
352	sc->css_if->if_ierrors++;
353	sc->css_flush = 1;
354	}
355
356	if (sc->css_flush) {
357	if (addr->css_icsr & IN_EOM)
358	sc->css_flush = 0;
359	goto setup;
360	}
361
362	len = IMPMTU + (addr->css_iwc << 1);
363	if (len < 0 \|\| len > IMPMTU) {
364	printf("css%d: bad length=%d\n", len);
365	sc->css_if->if_ierrors++;
366	goto setup;
367	}
368
369	/*
370	* The last parameter is always 0 since using
371	* trailers on the ARPAnet is insane.
372	*/
373	m = if_rubaget(&sc->css_ifuba, len, 0);
374	if (m == 0)
375	goto setup;
376	if ((addr->css_icsr & IN_EOM) == 0) {
377	if (sc->css_iq)
378	m_cat(sc->css_iq, m);
379	else
380	sc->css_iq = m;
381	goto setup;
382	}
383	if (sc->css_iq) {
384	m_cat(sc->css_iq, m);
385	m = sc->css_iq;
386	sc->css_iq = 0;
387	}
388	impinput(unit, m);
389
390	setup:
391	/*
392	* Setup for next message.
393	*/
394	info = sc->css_ifuba.ifu_r.ifrw_info;
395	addr->css_iba = (u_short)info;
396	addr->css_iwc = - (IMPMTU >> 1);
397	addr->css_icsr =
398	IN_HRDY \| CSS_IE \| IN_WEN \| ((info & 0x30000) >> 12) \| CSS_GO;
399	}