2 * Copyright (c) 1994-2000
3 * Paul Richards. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * verbatim and that no modifications are made prior to this
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name Paul Richards may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY PAUL RICHARDS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL PAUL RICHARDS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * $FreeBSD: src/sys/dev/lnc/if_lnc.c,v 1.89 2001/07/04 13:00:19 nyan Exp $
31 * $DragonFly: src/sys/dev/netif/lnc/Attic/if_lnc.c,v 1.22 2005/06/14 11:41:37 joerg Exp $
40 * Check all the XXX comments -- some of them are just things I've left
41 * unfinished rather than "difficult" problems that were hacked around.
45 * Check how all the arpcom flags get set and used.
47 * Re-inline and re-static all routines after debugging.
49 * Remember to assign iobase in SHMEM probe routines.
51 * Replace all occurences of LANCE-controller-card etc in prints by the name
52 * strings of the appropriate type -- nifty window dressing
54 * Add DEPCA support -- mostly done.
60 /* Some defines that should really be in generic locations */
62 #define MULTICAST_FILTER_LEN 8
64 #include <sys/param.h>
65 #include <sys/systm.h>
67 #include <sys/kernel.h>
68 #include <sys/malloc.h>
70 #include <sys/module.h>
71 #include <sys/socket.h>
72 #include <sys/sockio.h>
73 #include <sys/syslog.h>
74 #include <sys/thread2.h>
76 #include <machine/bus.h>
77 #include <machine/resource.h>
80 #include <net/ethernet.h>
82 #include <net/ifq_var.h>
83 #include <net/if_dl.h>
84 #include <net/if_types.h>
86 #include <netinet/in.h>
87 #include <netinet/if_ether.h>
91 #include <machine/md_var.h>
93 #include <dev/netif/lnc/if_lncvar.h>
94 #include <dev/netif/lnc/if_lncreg.h>
96 DECLARE_DUMMY_MODULE(if_lnc);
98 devclass_t lnc_devclass;
100 static char const * const nic_ident[] = {
105 "CNET98S", /* PC-98 */
108 static char const * const ic_ident[] = {
123 static void lnc_setladrf(struct lnc_softc *sc);
124 static void lnc_reset(struct lnc_softc *sc);
125 static void lnc_free_mbufs(struct lnc_softc *sc);
126 static __inline int alloc_mbuf_cluster(struct lnc_softc *sc,
127 struct host_ring_entry *desc);
128 static __inline struct mbuf *chain_mbufs(struct lnc_softc *sc,
131 static __inline struct mbuf *mbuf_packet(struct lnc_softc *sc,
134 static void lnc_rint(struct lnc_softc *sc);
135 static void lnc_tint(struct lnc_softc *sc);
137 static void lnc_init(void *);
138 static __inline int mbuf_to_buffer(struct mbuf *m, char *buffer);
139 static __inline struct mbuf *chain_to_cluster(struct mbuf *m);
140 static void lnc_start(struct ifnet *ifp);
141 static int lnc_ioctl(struct ifnet *ifp, u_long command, caddr_t data,
143 static void lnc_watchdog(struct ifnet *ifp);
145 void lnc_dump_state(struct lnc_softc *sc);
146 void mbuf_dump_chain(struct mbuf *m);
150 read_csr(struct lnc_softc *sc, u_short port)
152 lnc_outw(sc->rap, port);
153 return (lnc_inw(sc->rdp));
157 write_csr(struct lnc_softc *sc, u_short port, u_short val)
159 lnc_outw(sc->rap, port);
160 lnc_outw(sc->rdp, val);
164 write_bcr(struct lnc_softc *sc, u_short port, u_short val)
166 lnc_outw(sc->rap, port);
167 lnc_outw(sc->bdp, val);
170 static __inline u_short
171 read_bcr(struct lnc_softc *sc, u_short port)
173 lnc_outw(sc->rap, port);
174 return (lnc_inw(sc->bdp));
178 lance_probe(struct lnc_softc *sc)
180 write_csr(sc, CSR0, STOP);
182 if ((lnc_inw(sc->rdp) & STOP) && ! (read_csr(sc, CSR3))) {
184 * Check to see if it's a C-LANCE. For the LANCE the INEA bit
185 * cannot be set while the STOP bit is. This restriction is
186 * removed for the C-LANCE.
188 write_csr(sc, CSR0, INEA);
189 if (read_csr(sc, CSR0) & INEA)
197 static __inline u_long
198 ether_crc(const u_char *ether_addr)
200 #define POLYNOMIAL 0xEDB88320UL
202 u_int crc = 0xFFFFFFFFUL;
204 for (i = 0; i < ETHER_ADDR_LEN; i++) {
205 addr = *ether_addr++;
206 for (j = 0; j < MULTICAST_FILTER_LEN; j++) {
207 crc = (crc >> 1) ^ (((crc ^ addr) & 1) ? POLYNOMIAL : 0);
216 * Set up the logical address filter for multicast packets
219 lnc_setladrf(struct lnc_softc *sc)
221 struct ifnet *ifp = &sc->arpcom.ac_if;
222 struct ifmultiaddr *ifma;
226 if (sc->flags & IFF_ALLMULTI) {
227 for (i=0; i < MULTICAST_FILTER_LEN; i++)
228 sc->init_block->ladrf[i] = 0xFF;
233 * For each multicast address, calculate a crc for that address and
234 * then use the high order 6 bits of the crc as a hash code where
235 * bits 3-5 select the byte of the address filter and bits 0-2 select
236 * the bit within that byte.
239 bzero(sc->init_block->ladrf, MULTICAST_FILTER_LEN);
240 LIST_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
241 if (ifma->ifma_addr->sa_family != AF_LINK)
244 index = ether_crc(LLADDR((struct sockaddr_dl *)ifma->ifma_addr))
246 sc->init_block->ladrf[index >> 3] |= 1 << (index & 7);
251 lnc_stop(struct lnc_softc *sc)
253 write_csr(sc, CSR0, STOP);
257 lnc_reset(struct lnc_softc *sc)
263 lnc_free_mbufs(struct lnc_softc *sc)
268 * We rely on other routines to keep the buff.mbuf field valid. If
269 * it's not NULL then we assume it points to an allocated mbuf.
272 for (i = 0; i < NDESC(sc->nrdre); i++)
273 if ((sc->recv_ring + i)->buff.mbuf)
274 m_free((sc->recv_ring + i)->buff.mbuf);
276 for (i = 0; i < NDESC(sc->ntdre); i++)
277 if ((sc->trans_ring + i)->buff.mbuf)
278 m_free((sc->trans_ring + i)->buff.mbuf);
285 alloc_mbuf_cluster(struct lnc_softc *sc, struct host_ring_entry *desc)
287 struct mds *md = desc->md;
291 /* Try and get cluster off local cache */
292 if (sc->mbuf_count) {
295 sc->mbufs = m->m_next;
296 /* XXX m->m_data = m->m_ext.ext_buf;*/
298 m = m_getcl(MB_DONTWAIT, MT_DATA, 0);
304 addr = kvtop(m->m_data);
306 md->md1= ((addr >> 16) & 0xff) | OWN;
307 md->md2 = -(short)(MCLBYTES - sizeof(struct pkthdr));
312 static __inline struct mbuf *
313 chain_mbufs(struct lnc_softc *sc, int start_of_packet, int pkt_len)
315 struct mbuf *head, *m;
316 struct host_ring_entry *desc;
319 * Turn head into a pkthdr mbuf --
320 * assumes a pkthdr type mbuf was
321 * allocated to the descriptor
325 desc = sc->recv_ring + start_of_packet;
327 head = desc->buff.mbuf;
328 head->m_flags |= M_PKTHDR;
329 bzero(&head->m_pkthdr, sizeof(head->m_pkthdr));
334 m->m_len = min((MCLBYTES - sizeof(struct pkthdr)), pkt_len);
336 if (alloc_mbuf_cluster(sc, desc))
337 return((struct mbuf *)NULL);
338 INC_MD_PTR(start_of_packet, sc->nrdre)
339 desc = sc->recv_ring + start_of_packet;
340 m->m_next = desc->buff.mbuf;
341 } while (start_of_packet != sc->recv_next);
347 static __inline struct mbuf *
348 mbuf_packet(struct lnc_softc *sc, int start_of_packet, int pkt_len)
351 struct host_ring_entry *start;
352 struct mbuf *head,*m,*m_prev;
353 char *data,*mbuf_data;
357 /* Get a pkthdr mbuf for the start of packet */
358 MGETHDR(head, MB_DONTWAIT, MT_DATA);
360 LNCSTATS(drop_packet)
366 start = sc->recv_ring + start_of_packet;
367 /*blen = -(start->md->md2);*/
368 blen = RECVBUFSIZE; /* XXX More PCnet-32 crap */
369 data = start->buff.data;
370 mbuf_data = m->m_data;
372 while (start_of_packet != sc->recv_next) {
374 * If the data left fits in a single buffer then set
375 * blen to the size of the data left.
381 * amount is least of data in current ring buffer and
382 * amount of space left in current mbuf.
384 amount = min(blen, M_TRAILINGSPACE(m));
386 /* mbuf must be empty */
388 m = m_getl(pkt_len, MB_DONTWAIT, MT_DATA, 0, NULL);
395 amount = min(blen, M_TRAILINGSPACE(m));
396 mbuf_data = m->m_data;
398 bcopy(data, mbuf_data, amount);
406 start->md->md1 &= HADR;
407 start->md->md1 |= OWN;
408 start->md->md2 = -RECVBUFSIZE; /* XXX - shouldn't be necessary */
409 INC_MD_PTR(start_of_packet, sc->nrdre)
410 start = sc->recv_ring + start_of_packet;
411 data = start->buff.data;
412 /*blen = -(start->md->md2);*/
413 blen = RECVBUFSIZE; /* XXX More PCnet-32 crap */
421 lnc_rint(struct lnc_softc *sc)
423 struct ifnet *ifp = &sc->arpcom.ac_if;
424 struct host_ring_entry *next, *start;
427 struct ether_header *eh;
433 * The LANCE will issue a RINT interrupt when the ownership of the
434 * last buffer of a receive packet has been relinquished by the LANCE.
435 * Therefore, it can be assumed that a complete packet can be found
436 * before hitting buffers that are still owned by the LANCE, if not
437 * then there is a bug in the driver that is causing the descriptors
438 * to get out of sync.
442 if ((sc->recv_ring + sc->recv_next)->md->md1 & OWN) {
443 int unit = ifp->if_dunit;
444 log(LOG_ERR, "lnc%d: Receive interrupt with buffer still owned by controller -- Resetting\n", unit);
448 if (!((sc->recv_ring + sc->recv_next)->md->md1 & STP)) {
449 int unit = ifp->if_dunit;
450 log(LOG_ERR, "lnc%d: Receive interrupt but not start of packet -- Resetting\n", unit);
457 next = sc->recv_ring + sc->recv_next;
458 while ((flags = next->md->md1) & STP) {
460 /* Make a note of the start of the packet */
461 start_of_packet = sc->recv_next;
464 * Find the end of the packet. Even if not data chaining,
465 * jabber packets can overrun into a second descriptor.
466 * If there is no error, then the ENP flag is set in the last
467 * descriptor of the packet. If there is an error then the ERR
468 * flag will be set in the descriptor where the error occured.
469 * Therefore, to find the last buffer of a packet we search for
473 if (!(flags & (ENP | MDERR))) {
475 INC_MD_PTR(sc->recv_next, sc->nrdre)
476 next = sc->recv_ring + sc->recv_next;
477 flags = next->md->md1;
478 } while (!(flags & (STP | OWN | ENP | MDERR)));
481 int unit = ifp->if_dunit;
482 log(LOG_ERR, "lnc%d: Start of packet found before end of previous in receive ring -- Resetting\n", unit);
489 * Looked ahead into a packet still
492 sc->recv_next = start_of_packet;
495 int unit = ifp->if_dunit;
496 log(LOG_ERR, "lnc%d: End of received packet not found-- Resetting\n", unit);
503 pkt_len = (next->md->md3 & MCNT) - FCS_LEN;
505 /* Move pointer onto start of next packet */
506 INC_MD_PTR(sc->recv_next, sc->nrdre)
507 next = sc->recv_ring + sc->recv_next;
510 int unit = ifp->if_dunit;
513 log(LOG_ERR, "lnc%d: Receive buffer error\n", unit);
516 /* OFLO only valid if ENP is not set */
517 if (!(flags & ENP)) {
519 log(LOG_ERR, "lnc%d: Receive overflow error \n", unit);
521 } else if (flags & ENP) {
522 if ((ifp->if_flags & IFF_PROMISC)==0) {
524 * FRAM and CRC are valid only if ENP
525 * is set and OFLO is not.
529 log(LOG_ERR, "lnc%d: Framing error\n", unit);
531 * FRAM is only set if there's a CRC
532 * error so avoid multiple messages
534 } else if (flags & CRC) {
536 log(LOG_ERR, "lnc%d: Receive CRC error\n", unit);
544 while (start_of_packet != sc->recv_next) {
545 start = sc->recv_ring + start_of_packet;
546 start->md->md2 = -RECVBUFSIZE; /* XXX - shouldn't be necessary */
547 start->md->md1 &= HADR;
548 start->md->md1 |= OWN;
549 INC_MD_PTR(start_of_packet, sc->nrdre)
551 } else { /* Valid packet */
556 if (sc->nic.mem_mode == DMA_MBUF)
557 head = chain_mbufs(sc, start_of_packet, pkt_len);
559 head = mbuf_packet(sc, start_of_packet, pkt_len);
563 * First mbuf in packet holds the
564 * ethernet and packet headers
566 head->m_pkthdr.rcvif = ifp;
567 head->m_pkthdr.len = pkt_len ;
568 eh = mtod(head, struct ether_header *);
571 * vmware ethernet hardware emulation loops
572 * packets back to itself, violates IFF_SIMPLEX.
573 * drop it if it is from myself.
575 if (bcmp(eh->ether_shost,
576 sc->arpcom.ac_enaddr, ETHER_ADDR_LEN) == 0) {
579 (ifp->if_input)(ifp, head);
582 int unit = ifp->if_dunit;
583 log(LOG_ERR,"lnc%d: Packet dropped, no mbufs\n",unit);
584 LNCSTATS(drop_packet)
592 * At this point all completely received packets have been processed
593 * so clear RINT since any packets that have arrived while we were in
594 * here have been dealt with.
597 lnc_outw(sc->rdp, RINT | INEA);
601 lnc_tint(struct lnc_softc *sc)
603 struct host_ring_entry *next, *start;
608 * If the driver is reset in this routine then we return immediately to
609 * the interrupt driver routine. Any interrupts that have occured
610 * since the reset will be dealt with there. sc->trans_next
611 * should point to the start of the first packet that was awaiting
612 * transmission after the last transmit interrupt was dealt with. The
613 * LANCE should have relinquished ownership of that descriptor before
614 * the interrupt. Therefore, sc->trans_next should point to a
615 * descriptor with STP set and OWN cleared. If not then the driver's
616 * pointers are out of sync with the LANCE, which signifies a bug in
617 * the driver. Therefore, the following two checks are really
618 * diagnostic, since if the driver is working correctly they should
623 if ((sc->trans_ring + sc->trans_next)->md->md1 & OWN) {
624 int unit = sc->arpcom.ac_if.if_dunit;
625 log(LOG_ERR, "lnc%d: Transmit interrupt with buffer still owned by controller -- Resetting\n", unit);
633 * The LANCE will write the status information for the packet it just
634 * tried to transmit in one of two places. If the packet was
635 * transmitted successfully then the status will be written into the
636 * last descriptor of the packet. If the transmit failed then the
637 * status will be written into the descriptor that was being accessed
638 * when the error occured and all subsequent descriptors in that
639 * packet will have been relinquished by the LANCE.
641 * At this point we know that sc->trans_next points to the start
642 * of a packet that the LANCE has just finished trying to transmit.
643 * We now search for a buffer with either ENP or ERR set.
649 start_of_packet = sc->trans_next;
650 next = sc->trans_ring + sc->trans_next;
653 if (!(next->md->md1 & STP)) {
654 int unit = sc->arpcom.ac_if.if_dunit;
655 log(LOG_ERR, "lnc%d: Transmit interrupt but not start of packet -- Resetting\n", unit);
662 * Find end of packet.
665 if (!(next->md->md1 & (ENP | MDERR))) {
667 INC_MD_PTR(sc->trans_next, sc->ntdre)
668 next = sc->trans_ring + sc->trans_next;
669 } while (!(next->md->md1 & (STP | OWN | ENP | MDERR)));
671 if (next->md->md1 & STP) {
672 int unit = sc->arpcom.ac_if.if_dunit;
673 log(LOG_ERR, "lnc%d: Start of packet found before end of previous in transmit ring -- Resetting\n", unit);
677 if (next->md->md1 & OWN) {
680 * Looked ahead into a packet still
683 sc->trans_next = start_of_packet;
686 int unit = sc->arpcom.ac_if.if_dunit;
687 log(LOG_ERR, "lnc%d: End of transmitted packet not found -- Resetting\n", unit);
694 * Check for ERR first since other flags are irrelevant if an
697 if (next->md->md1 & MDERR) {
699 int unit = sc->arpcom.ac_if.if_dunit;
702 sc->arpcom.ac_if.if_oerrors++;
704 if (next->md->md3 & LCOL) {
706 log(LOG_ERR, "lnc%d: Transmit late collision -- Net error?\n", unit);
707 sc->arpcom.ac_if.if_collisions++;
709 * Clear TBUFF since it's not valid when LCOL
712 next->md->md3 &= ~TBUFF;
714 if (next->md->md3 & LCAR) {
716 log(LOG_ERR, "lnc%d: Loss of carrier during transmit -- Net error?\n", unit);
718 if (next->md->md3 & RTRY) {
720 log(LOG_ERR, "lnc%d: Transmit of packet failed after 16 attempts -- TDR = %d\n", unit, ((sc->trans_ring + sc->trans_next)->md->md3 & TDR));
721 sc->arpcom.ac_if.if_collisions += 16;
723 * Clear TBUFF since it's not valid when RTRY
726 next->md->md3 &= ~TBUFF;
729 * TBUFF is only valid if neither LCOL nor RTRY are set.
730 * We need to check UFLO after LCOL and RTRY so that we
731 * know whether or not TBUFF is valid. If either are
732 * set then TBUFF will have been cleared above. A
733 * UFLO error will turn off the transmitter so we
738 if (next->md->md3 & UFLO) {
741 * If an UFLO has occured it's possibly due
744 if (next->md->md3 & TBUFF) {
746 log(LOG_ERR, "lnc%d: Transmit buffer error -- Resetting\n", unit);
748 log(LOG_ERR, "lnc%d: Transmit underflow error -- Resetting\n", unit);
753 INC_MD_PTR(sc->trans_next, sc->ntdre)
754 next = sc->trans_ring + sc->trans_next;
755 } while (!(next->md->md1 & STP) && (sc->trans_next != sc->next_to_send));
759 * Since we check for ERR first then if we get here
760 * the packet was transmitted correctly. There may
761 * still have been non-fatal errors though.
762 * Don't bother checking for DEF, waste of time.
765 sc->arpcom.ac_if.if_opackets++;
767 if (next->md->md1 & MORE) {
769 sc->arpcom.ac_if.if_collisions += 2;
773 * ONE is invalid if LCOL is set. If LCOL was set then
774 * ERR would have also been set and we would have
775 * returned from lnc_tint above. Therefore we can
776 * assume if we arrive here that ONE is valid.
780 if (next->md->md1 & ONE) {
782 sc->arpcom.ac_if.if_collisions++;
784 INC_MD_PTR(sc->trans_next, sc->ntdre)
785 next = sc->trans_ring + sc->trans_next;
789 * Clear descriptors and free any mbufs.
793 start = sc->trans_ring + start_of_packet;
794 start->md->md1 &= HADR;
795 if (sc->nic.mem_mode == DMA_MBUF) {
796 /* Cache clusters on a local queue */
797 if ((start->buff.mbuf->m_flags & M_EXT) && (sc->mbuf_count < MBUF_CACHE_LIMIT)) {
798 if (sc->mbuf_count) {
799 start->buff.mbuf->m_next = sc->mbufs;
800 sc->mbufs = start->buff.mbuf;
802 sc->mbufs = start->buff.mbuf;
804 start->buff.mbuf = 0;
806 m_free(start->buff.mbuf);
807 start->buff.mbuf = NULL;
810 sc->pending_transmits--;
811 INC_MD_PTR(start_of_packet, sc->ntdre)
812 }while (start_of_packet != sc->trans_next);
815 * There's now at least one free descriptor
816 * in the ring so indicate that we can accept
817 * more packets again.
820 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
824 } while (sc->pending_transmits && !(next->md->md1 & OWN));
827 * Clear TINT since we've dealt with all
828 * the completed transmissions.
831 lnc_outw(sc->rdp, TINT | INEA);
835 lnc_attach_common(device_t dev)
837 lnc_softc_t *sc = device_get_softc(dev);
838 struct ifnet *ifp = &sc->arpcom.ac_if;
842 switch (sc->nic.ident) {
852 /* Set default mode */
853 sc->nic.mode = NORMAL;
855 /* Fill in arpcom structure entries */
858 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
859 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
861 ifp->if_start = lnc_start;
862 ifp->if_ioctl = lnc_ioctl;
863 ifp->if_watchdog = lnc_watchdog;
864 ifp->if_init = lnc_init;
865 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
866 ifq_set_ready(&ifp->if_snd);
868 /* Extract MAC address from PROM */
869 for (i = 0; i < ETHER_ADDR_LEN; i++)
870 sc->arpcom.ac_enaddr[i] = lnc_inb(i * skip);
873 * XXX -- should check return status of if_attach
876 ether_ifattach(&sc->arpcom.ac_if, sc->arpcom.ac_enaddr);
878 if (sc->nic.ic == LANCE || sc->nic.ic == C_LANCE)
879 if_printf(ifp, "%s (%s)", nic_ident[sc->nic.ident],
880 ic_ident[sc->nic.ic]);
882 if_printf(ifp, "%s\n", ic_ident[sc->nic.ic]);
891 struct lnc_softc *sc = xsc;
897 /* Shut down interface */
899 sc->arpcom.ac_if.if_flags |= IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; /* XXX??? */
902 * This sets up the memory area for the controller. Memory is set up for
903 * the initialisation block (12 words of contiguous memory starting
904 * on a word boundary),the transmit and receive ring structures (each
905 * entry is 4 words long and must start on a quadword boundary) and
908 * The alignment tests are particularly paranoid.
912 sc->trans_ring = sc->recv_ring + NDESC(sc->nrdre);
915 if (sc->nic.mem_mode == SHMEM)
916 lnc_mem = (char *) sc->nic.iobase;
918 lnc_mem = (char *) (sc->trans_ring + NDESC(sc->ntdre));
920 lnc_mem = (char *)(((int)lnc_mem + 1) & ~1);
921 sc->init_block = (struct init_block *) ((int) lnc_mem & ~1);
922 lnc_mem = (char *) (sc->init_block + 1);
923 lnc_mem = (char *)(((int)lnc_mem + 7) & ~7);
925 /* Initialise pointers to descriptor entries */
926 for (i = 0; i < NDESC(sc->nrdre); i++) {
927 (sc->recv_ring + i)->md = (struct mds *) lnc_mem;
928 lnc_mem += sizeof(struct mds);
930 for (i = 0; i < NDESC(sc->ntdre); i++) {
931 (sc->trans_ring + i)->md = (struct mds *) lnc_mem;
932 lnc_mem += sizeof(struct mds);
935 /* Initialise the remaining ring entries */
937 if (sc->nic.mem_mode == DMA_MBUF) {
942 /* Free previously allocated mbufs */
943 if (sc->flags & LNC_INITIALISED)
947 for (i = 0; i < NDESC(sc->nrdre); i++) {
948 if (alloc_mbuf_cluster(sc, sc->recv_ring+i)) {
949 log(LOG_ERR, "Initialisation failed -- no mbufs\n");
955 for (i = 0; i < NDESC(sc->ntdre); i++) {
956 (sc->trans_ring + i)->buff.mbuf = 0;
957 (sc->trans_ring + i)->md->md0 = 0;
958 (sc->trans_ring + i)->md->md1 = 0;
959 (sc->trans_ring + i)->md->md2 = 0;
960 (sc->trans_ring + i)->md->md3 = 0;
963 for (i = 0; i < NDESC(sc->nrdre); i++) {
964 (sc->recv_ring + i)->md->md0 = kvtop(lnc_mem);
965 (sc->recv_ring + i)->md->md1 = ((kvtop(lnc_mem) >> 16) & 0xff) | OWN;
966 (sc->recv_ring + i)->md->md2 = -RECVBUFSIZE;
967 (sc->recv_ring + i)->md->md3 = 0;
968 (sc->recv_ring + i)->buff.data = lnc_mem;
969 lnc_mem += RECVBUFSIZE;
971 for (i = 0; i < NDESC(sc->ntdre); i++) {
972 (sc->trans_ring + i)->md->md0 = kvtop(lnc_mem);
973 (sc->trans_ring + i)->md->md1 = ((kvtop(lnc_mem) >> 16) & 0xff);
974 (sc->trans_ring + i)->md->md2 = 0;
975 (sc->trans_ring + i)->md->md3 = 0;
976 (sc->trans_ring + i)->buff.data = lnc_mem;
977 lnc_mem += TRANSBUFSIZE;
981 sc->next_to_send = 0;
983 /* Set up initialisation block */
985 sc->init_block->mode = sc->nic.mode;
987 for (i = 0; i < ETHER_ADDR_LEN; i++)
988 sc->init_block->padr[i] = sc->arpcom.ac_enaddr[i];
992 sc->init_block->rdra = kvtop(sc->recv_ring->md);
993 sc->init_block->rlen = ((kvtop(sc->recv_ring->md) >> 16) & 0xff) | (sc->nrdre << 13);
994 sc->init_block->tdra = kvtop(sc->trans_ring->md);
995 sc->init_block->tlen = ((kvtop(sc->trans_ring->md) >> 16) & 0xff) | (sc->ntdre << 13);
998 /* Set flags to show that the memory area is valid */
999 sc->flags |= LNC_INITIALISED;
1001 sc->pending_transmits = 0;
1003 /* Give the LANCE the physical address of the initialisation block */
1005 if (sc->nic.ic == PCnet_Home) {
1007 /* Set PHY_SEL to HomeRun */
1008 media = read_bcr(sc, BCR49);
1011 write_bcr(sc, BCR49, media);
1014 write_csr(sc, CSR1, kvtop(sc->init_block));
1015 write_csr(sc, CSR2, (kvtop(sc->init_block) >> 16) & 0xff);
1018 * Depending on which controller this is, CSR3 has different meanings.
1019 * For the Am7990 it controls DMA operations, for the Am79C960 it
1020 * controls interrupt masks and transmitter algorithms. In either
1021 * case, none of the flags are set.
1025 write_csr(sc, CSR3, 0);
1027 /* Let's see if it starts */
1029 printf("Enabling lnc interrupts\n");
1030 sc->arpcom.ac_if.if_timer = 10;
1031 write_csr(sc, CSR0, INIT|INEA);
1035 * Now that the initialisation is complete there's no reason to
1036 * access anything except CSR0, so we leave RAP pointing there
1037 * so we can just access RDP from now on, saving an outw each
1041 write_csr(sc, CSR0, INIT);
1042 for(i=0; i < 1000; i++)
1043 if (read_csr(sc, CSR0) & IDON)
1046 if (read_csr(sc, CSR0) & IDON) {
1048 * Enable interrupts, start the LANCE, mark the interface as
1049 * running and transmit any pending packets.
1051 write_csr(sc, CSR0, STRT | INEA);
1052 sc->arpcom.ac_if.if_flags |= IFF_RUNNING;
1053 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
1054 lnc_start(&sc->arpcom.ac_if);
1056 log(LOG_ERR, "%s: Initialisation failed\n",
1057 sc->arpcom.ac_if.if_xname);
1063 * The interrupt flag (INTR) will be set and provided that the interrupt enable
1064 * flag (INEA) is also set, the interrupt pin will be driven low when any of
1065 * the following occur:
1067 * 1) Completion of the initialisation routine (IDON). 2) The reception of a
1068 * packet (RINT). 3) The transmission of a packet (TINT). 4) A transmitter
1069 * timeout error (BABL). 5) A missed packet (MISS). 6) A memory error (MERR).
1071 * The interrupt flag is cleared when all of the above conditions are cleared.
1073 * If the driver is reset from this routine then it first checks to see if any
1074 * interrupts have ocurred since the reset and handles them before returning.
1075 * This is because the NIC may signify a pending interrupt in CSR0 using the
1076 * INTR flag even if a hardware interrupt is currently inhibited (at least I
1077 * think it does from reading the data sheets). We may as well deal with
1078 * these pending interrupts now rather than get the overhead of another
1079 * hardware interrupt immediately upon returning from the interrupt handler.
1086 lnc_softc_t *sc = arg;
1087 int unit = sc->arpcom.ac_if.if_dunit;
1091 * INEA is the only bit that can be cleared by writing a 0 to it so
1092 * we have to include it in any writes that clear other flags.
1095 while ((csr0 = lnc_inw(sc->rdp)) & INTR) {
1098 * Clear interrupt flags early to avoid race conditions. The
1099 * controller can still set these flags even while we're in
1100 * this interrupt routine. If the flag is still set from the
1101 * event that caused this interrupt any new events will
1105 lnc_outw(sc->rdp, csr0);
1106 /*lnc_outw(sc->rdp, IDON | CERR | BABL | MISS | MERR | RINT | TINT | INEA);*/
1111 sc->arpcom.ac_if.if_timer = 0;
1112 write_csr(sc, CSR0, STRT | INEA);
1113 sc->arpcom.ac_if.if_flags |= IFF_RUNNING;
1114 sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
1115 lnc_start(&sc->arpcom.ac_if);
1122 log(LOG_ERR, "lnc%d: Heartbeat error -- SQE test failed\n", unit);
1126 log(LOG_ERR, "lnc%d: Babble error - more than 1519 bytes transmitted\n", unit);
1128 sc->arpcom.ac_if.if_oerrors++;
1131 log(LOG_ERR, "lnc%d: Missed packet -- no receive buffer\n", unit);
1133 sc->arpcom.ac_if.if_ierrors++;
1136 log(LOG_ERR, "lnc%d: Memory error -- Resetting\n", unit);
1148 sc->arpcom.ac_if.if_timer = 0;
1153 * If there's room in the transmit descriptor ring then queue
1154 * some more transmit packets.
1157 if (!(sc->arpcom.ac_if.if_flags & IFF_OACTIVE))
1158 lnc_start(&sc->arpcom.ac_if);
1163 mbuf_to_buffer(struct mbuf *m, char *buffer)
1168 for( ; m; m = m->m_next) {
1169 bcopy(mtod(m, caddr_t), buffer, m->m_len);
1177 static __inline struct mbuf *
1178 chain_to_cluster(struct mbuf *m)
1182 new = m_getcl(MB_DONTWAIT, MT_DATA, 0);
1185 new->m_len = mbuf_to_buffer(m, new->m_data);
1191 * IFF_OACTIVE and IFF_RUNNING are checked in ether_output so it's redundant
1192 * to check them again since we wouldn't have got here if they were not
1193 * appropriately set. This is also called from lnc_init and lncintr but the
1194 * flags should be ok at those points too.
1198 lnc_start(struct ifnet *ifp)
1201 struct lnc_softc *sc = ifp->if_softc;
1202 struct host_ring_entry *desc;
1205 struct mbuf *head, *m;
1208 int no_entries_needed;
1211 head = ifq_dequeue(&sc->arpcom.ac_if.if_snd);
1215 if (sc->nic.mem_mode == DMA_MBUF) {
1217 no_entries_needed = 0;
1218 for (m=head; m; m = m->m_next)
1219 no_entries_needed++;
1222 * We try and avoid bcopy as much as possible
1223 * but there are two cases when we use it.
1225 * 1) If there are not enough free entries in the ring
1226 * to hold each mbuf in the chain then compact the
1227 * chain into a single cluster.
1229 * 2) The Am7990 and Am79C90 must not have less than
1230 * 100 bytes in the first descriptor of a chained
1231 * packet so it's necessary to shuffle the mbuf
1232 * contents to ensure this.
1236 if (no_entries_needed > (NDESC(sc->ntdre) - sc->pending_transmits)) {
1237 if (!(head = chain_to_cluster(head))) {
1238 log(LOG_ERR, "%s: Couldn't get mbuf for transmit packet -- Resetting \n ",ifp->if_xname);
1242 } else if ((sc->nic.ic == LANCE) || (sc->nic.ic == C_LANCE)) {
1243 if ((head->m_len < 100) && (head->m_next)) {
1244 len = 100 - head->m_len;
1245 if (M_TRAILINGSPACE(head) < len) {
1247 * Move data to start of data
1248 * area. We assume the first
1249 * mbuf has a packet header
1250 * and is not a cluster.
1252 bcopy((caddr_t)head->m_data, (caddr_t)head->m_pktdat, head->m_len);
1253 head->m_data = head->m_pktdat;
1256 while (m && (len > 0)) {
1257 chunk = min(len, m->m_len);
1258 bcopy(mtod(m, caddr_t), mtod(head, caddr_t) + head->m_len, chunk);
1260 head->m_len += chunk;
1263 if (m->m_len <= 0) {
1271 tmp = sc->next_to_send;
1274 * On entering this loop we know that tmp points to a
1275 * descriptor with a clear OWN bit.
1278 desc = sc->trans_ring + tmp;
1279 len = ETHER_MIN_LEN;
1280 for (m = head; m; m = m->m_next) {
1281 desc->buff.mbuf = m;
1282 addr = kvtop(m->m_data);
1283 desc->md->md0 = addr;
1284 desc->md->md1 = ((addr >> 16) & 0xff);
1286 desc->md->md2 = -m->m_len;
1287 sc->pending_transmits++;
1290 INC_MD_PTR(tmp, sc->ntdre)
1291 desc = sc->trans_ring + tmp;
1294 end_of_packet = tmp;
1295 DEC_MD_PTR(tmp, sc->ntdre)
1296 desc = sc->trans_ring + tmp;
1297 desc->md->md1 |= ENP;
1300 desc->md->md2 -= len;
1303 * Set OWN bits in reverse order, otherwise the Lance
1304 * could start sending the packet before all the
1305 * buffers have been relinquished by the host.
1308 while (tmp != sc->next_to_send) {
1309 desc->md->md1 |= OWN;
1310 DEC_MD_PTR(tmp, sc->ntdre)
1311 desc = sc->trans_ring + tmp;
1313 sc->next_to_send = end_of_packet;
1314 desc->md->md1 |= STP | OWN;
1316 sc->pending_transmits++;
1317 desc = sc->trans_ring + sc->next_to_send;
1318 len = mbuf_to_buffer(head, desc->buff.data);
1320 desc->md->md2 = -max(len, ETHER_MIN_LEN - ETHER_CRC_LEN);
1321 desc->md->md1 |= OWN | STP | ENP;
1322 INC_MD_PTR(sc->next_to_send, sc->ntdre)
1325 /* Force an immediate poll of the transmit ring */
1326 lnc_outw(sc->rdp, TDMD | INEA);
1329 * Set a timer so if the buggy Am7990.h shuts
1330 * down we can wake it up.
1335 BPF_MTAP(&sc->arpcom.ac_if, head);
1337 if (sc->nic.mem_mode != DMA_MBUF)
1340 } while (sc->pending_transmits < NDESC(sc->ntdre));
1343 * Transmit ring is full so set IFF_OACTIVE
1344 * since we can't buffer any more packets.
1347 sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
1348 LNCSTATS(trans_ring_full)
1352 lnc_ioctl(struct ifnet * ifp, u_long command, caddr_t data, struct ucred *cr)
1355 struct lnc_softc *sc = ifp->if_softc;
1363 if (ifp->if_flags & IFF_DEBUG)
1368 if (ifp->if_flags & IFF_PROMISC) {
1369 if (!(sc->nic.mode & PROM)) {
1370 sc->nic.mode |= PROM;
1373 } else if (sc->nic.mode & PROM) {
1374 sc->nic.mode &= ~PROM;
1378 if ((ifp->if_flags & IFF_ALLMULTI) &&
1379 !(sc->flags & LNC_ALLMULTI)) {
1380 sc->flags |= LNC_ALLMULTI;
1382 } else if (!(ifp->if_flags & IFF_ALLMULTI) &&
1383 (sc->flags & LNC_ALLMULTI)) {
1384 sc->flags &= ~LNC_ALLMULTI;
1388 if ((ifp->if_flags & IFF_UP) == 0 &&
1389 (ifp->if_flags & IFF_RUNNING) != 0) {
1391 * If interface is marked down and it is running,
1395 ifp->if_flags &= ~IFF_RUNNING;
1396 } else if ((ifp->if_flags & IFF_UP) != 0 &&
1397 (ifp->if_flags & IFF_RUNNING) == 0) {
1399 * If interface is marked up and it is stopped, then
1411 error = ether_ioctl(ifp, command, data);
1421 lnc_watchdog(struct ifnet *ifp)
1423 log(LOG_ERR, "%s: Device timeout -- Resetting\n", ifp->if_xname);
1425 lnc_reset(ifp->if_softc);
1430 lnc_dump_state(struct lnc_softc *sc)
1434 printf("\nDriver/NIC [%d] state dump\n", sc->arpcom.ac_if.if_dunit);
1435 printf("Memory access mode: %b\n", sc->nic.mem_mode, MEM_MODES);
1436 printf("Host memory\n");
1437 printf("-----------\n");
1439 printf("Receive ring: base = %p, next = %p\n",
1440 (void *)sc->recv_ring, (void *)(sc->recv_ring + sc->recv_next));
1441 for (i = 0; i < NDESC(sc->nrdre); i++)
1442 printf("\t%d:%p md = %p buff = %p\n",
1443 i, (void *)(sc->recv_ring + i),
1444 (void *)(sc->recv_ring + i)->md,
1445 (void *)(sc->recv_ring + i)->buff.data);
1447 printf("Transmit ring: base = %p, next = %p\n",
1448 (void *)sc->trans_ring, (void *)(sc->trans_ring + sc->trans_next));
1449 for (i = 0; i < NDESC(sc->ntdre); i++)
1450 printf("\t%d:%p md = %p buff = %p\n",
1451 i, (void *)(sc->trans_ring + i),
1452 (void *)(sc->trans_ring + i)->md,
1453 (void *)(sc->trans_ring + i)->buff.data);
1454 printf("Lance memory (may be on host(DMA) or card(SHMEM))\n");
1455 printf("Init block = %p\n", (void *)sc->init_block);
1456 printf("\tmode = %b rlen:rdra = %x:%x tlen:tdra = %x:%x\n",
1457 sc->init_block->mode, INIT_MODE, sc->init_block->rlen,
1458 sc->init_block->rdra, sc->init_block->tlen, sc->init_block->tdra);
1459 printf("Receive descriptor ring\n");
1460 for (i = 0; i < NDESC(sc->nrdre); i++)
1461 printf("\t%d buffer = 0x%x%x, BCNT = %d,\tMCNT = %u,\tflags = %b\n",
1462 i, ((sc->recv_ring + i)->md->md1 & HADR),
1463 (sc->recv_ring + i)->md->md0,
1464 -(short) (sc->recv_ring + i)->md->md2,
1465 (sc->recv_ring + i)->md->md3,
1466 (((sc->recv_ring + i)->md->md1 & ~HADR) >> 8), RECV_MD1);
1467 printf("Transmit descriptor ring\n");
1468 for (i = 0; i < NDESC(sc->ntdre); i++)
1469 printf("\t%d buffer = 0x%x%x, BCNT = %d,\tflags = %b %b\n",
1470 i, ((sc->trans_ring + i)->md->md1 & HADR),
1471 (sc->trans_ring + i)->md->md0,
1472 -(short) (sc->trans_ring + i)->md->md2,
1473 ((sc->trans_ring + i)->md->md1 >> 8), TRANS_MD1,
1474 ((sc->trans_ring + i)->md->md3 >> 10), TRANS_MD3);
1475 printf("\nnext_to_send = %x\n", sc->next_to_send);
1476 printf("\n CSR0 = %b CSR1 = %x CSR2 = %x CSR3 = %x\n\n",
1477 read_csr(sc, CSR0), CSR0_FLAGS, read_csr(sc, CSR1),
1478 read_csr(sc, CSR2), read_csr(sc, CSR3));
1480 /* Set RAP back to CSR0 */
1481 lnc_outw(sc->rap, CSR0);
1485 mbuf_dump_chain(struct mbuf * m)
1488 #define MBUF_FLAGS \
1489 "\20\1M_EXT\2M_PKTHDR\3M_EOR\4UNKNOWN\5M_BCAST\6M_MCAST"
1492 log(LOG_DEBUG, "m == NULL\n");
1494 log(LOG_DEBUG, "m = %p\n", (void *)m);
1495 log(LOG_DEBUG, "m_hdr.mh_next = %p\n",
1496 (void *)m->m_hdr.mh_next);
1497 log(LOG_DEBUG, "m_hdr.mh_nextpkt = %p\n",
1498 (void *)m->m_hdr.mh_nextpkt);
1499 log(LOG_DEBUG, "m_hdr.mh_len = %d\n", m->m_hdr.mh_len);
1500 log(LOG_DEBUG, "m_hdr.mh_data = %p\n",
1501 (void *)m->m_hdr.mh_data);
1502 log(LOG_DEBUG, "m_hdr.mh_type = %d\n", m->m_hdr.mh_type);
1503 log(LOG_DEBUG, "m_hdr.mh_flags = %b\n", m->m_hdr.mh_flags,
1505 if (!(m->m_hdr.mh_flags & (M_PKTHDR | M_EXT)))
1506 log(LOG_DEBUG, "M_dat.M_databuf = %p\n",
1507 (void *)m->M_dat.M_databuf);
1509 if (m->m_hdr.mh_flags & M_PKTHDR) {
1510 log(LOG_DEBUG, "M_dat.MH.MH_pkthdr.len = %d\n",
1511 m->M_dat.MH.MH_pkthdr.len);
1513 "M_dat.MH.MH_pkthdr.rcvif = %p\n",
1514 (void *)m->M_dat.MH.MH_pkthdr.rcvif);
1515 if (!(m->m_hdr.mh_flags & M_EXT))
1517 "M_dat.MH.MH_dat.MH_databuf = %p\n",
1518 (void *)m->M_dat.MH.MH_dat.MH_databuf);
1520 if (m->m_hdr.mh_flags & M_EXT) {
1522 "M_dat.MH.MH_dat.MH_ext.ext_buff %p\n",
1523 (void *)m->M_dat.MH.MH_dat.MH_ext.ext_buf);
1525 "M_dat.MH.MH_dat.MH_ext.ext_free %p\n",
1526 (void *)m->M_dat.MH.MH_dat.MH_ext.ext_free);
1528 "M_dat.MH.MH_dat.MH_ext.ext_size %d\n",
1529 m->M_dat.MH.MH_dat.MH_ext.ext_size);
1532 } while ((m = m->m_next) != NULL);