bcae2312af
This will not make any of object files that LINT create change; there might be differences with INET disabled, but hardly anything compiled before without INET anyway. Now the 'obvious' things will give a proper error if compiled without inet - ipx_ip, ipfw, tcp_debug. The only thing that _should_ work (but can't be made to compile reasonably easily) is sppp :-( This commit move struct arpcom from <netinet/if_ether.h> to <net/if_arp.h>.
843 lines
20 KiB
C
843 lines
20 KiB
C
/*
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* Cronyx-Sigma adapter driver for FreeBSD.
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* Supports PPP/HDLC and Cisco/HDLC protocol in synchronous mode,
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* and asyncronous channels with full modem control.
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* Keepalive protocol implemented in both Cisco and PPP modes.
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*
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* Copyright (C) 1994 Cronyx Ltd.
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* Author: Serge Vakulenko, <vak@zebub.msk.su>
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*
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* This software is distributed with NO WARRANTIES, not even the implied
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* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Authors grant any other persons or organisations permission to use
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* or modify this software as long as this message is kept with the software,
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* all derivative works or modified versions.
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*
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* Version 1.9, Wed Oct 4 18:58:15 MSK 1995
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*/
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#undef DEBUG
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#include "cx.h"
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#include "bpfilter.h"
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#include "sppp.h"
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#if NSPPP <= 0
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#error The device 'cx' requires sppp.
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/sockio.h>
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#include <sys/socket.h>
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#include <sys/conf.h>
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#include <net/if.h>
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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#include <i386/isa/isa_device.h>
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#ifdef DEVFS
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extern struct cdevsw cx_cdevsw;
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#define watchdog_func_t void(*)(struct ifnet *)
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#define start_func_t void(*)(struct ifnet*)
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#include <net/if_sppp.h>
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#include <machine/cronyx.h>
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#include <i386/isa/cxreg.h>
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/* XXX exported. */
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void cxswitch (cx_chan_t *c, cx_soft_opt_t new);
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static int cxprobe __P((struct isa_device *id));
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static int cxattach __P((struct isa_device *id));
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static void cxput __P((cx_chan_t *c, char b));
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static void cxsend __P((cx_chan_t *c));
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static void cxrinth __P((cx_chan_t *c));
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static int cxtinth __P((cx_chan_t *c));
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#ifdef DEBUG
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# define print(s) printf s
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#else
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# define print(s) {/*void*/}
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#endif
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#define TXTIMEOUT 10 /* transmit timeout in seconds */
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#define DMABUFSZ (6*256) /* buffer size */
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#define PPP_HEADER_LEN 4 /* size of PPP header */
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/*
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* Under BSDI it's possible to use general p2p protocol scheme,
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* as well as our own one. Switching is done via IFF_ALTPHYS flag.
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* Our ifnet pointer holds the buffer large enough to contain
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* any of sppp and p2p structures.
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*/
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#define IFSTRUCTSZ (sizeof (struct sppp))
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#define IFNETSZ (sizeof (struct ifnet))
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static int cxsioctl (struct ifnet *ifp, int cmd, caddr_t data);
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static void cxstart (struct ifnet *ifp);
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static void cxwatchdog (struct ifnet *ifp);
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static void cxinput (cx_chan_t *c, void *buf, unsigned len);
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extern int cxrinta (cx_chan_t *c);
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extern void cxtinta (cx_chan_t *c);
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extern void cxmint (cx_chan_t *c);
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extern timeout_t cxtimeout;
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static void cxdown (cx_chan_t *c);
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static void cxup (cx_chan_t *c);
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cx_board_t cxboard [NCX]; /* adapter state structures */
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cx_chan_t *cxchan [NCX*NCHAN]; /* unit to channel struct pointer */
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static unsigned short irq_valid_values [] = { 3, 5, 7, 10, 11, 12, 15, 0 };
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static unsigned short drq_valid_values [] = { 5, 6, 7, 0 };
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static unsigned short port_valid_values [] = {
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0x240, 0x260, 0x280, 0x300, 0x320, 0x380, 0x3a0, 0,
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};
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/*
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* Check that the value is contained in the list of correct values.
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*/
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static int valid (unsigned short value, unsigned short *list)
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{
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while (*list)
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if (value == *list++)
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return (1);
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return (0);
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}
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/*
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* Print the mbuf chain, for debug purposes only.
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*/
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static void printmbuf (struct mbuf *m)
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{
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printf ("mbuf:");
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for (; m; m=m->m_next) {
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if (m->m_flags & M_PKTHDR)
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printf (" HDR %d:", m->m_pkthdr.len);
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if (m->m_flags & M_EXT)
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printf (" EXT:");
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printf (" %d", m->m_len);
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}
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printf ("\n");
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}
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/*
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* Make an mbuf from data.
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*/
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static struct mbuf *makembuf (void *buf, unsigned len)
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{
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struct mbuf *m, *o, *p;
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MGETHDR (m, M_DONTWAIT, MT_DATA);
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if (! m)
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return (0);
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if (len >= MINCLSIZE)
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MCLGET (m, M_DONTWAIT);
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m->m_pkthdr.len = len;
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m->m_len = 0;
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p = m;
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while (len) {
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unsigned n = M_TRAILINGSPACE (p);
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if (n > len)
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n = len;
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if (! n) {
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/* Allocate new mbuf. */
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o = p;
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MGET (p, M_DONTWAIT, MT_DATA);
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if (! p) {
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m_freem (m);
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return (0);
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}
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if (len >= MINCLSIZE)
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MCLGET (p, M_DONTWAIT);
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p->m_len = 0;
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o->m_next = p;
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n = M_TRAILINGSPACE (p);
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if (n > len)
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n = len;
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}
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bcopy (buf, mtod (p, caddr_t) + p->m_len, n);
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p->m_len += n;
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buf = (char *)buf + n;
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len -= n;
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}
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return (m);
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}
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/*
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* Test the presence of the adapter on the given i/o port.
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*/
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static int
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cxprobe (struct isa_device *id)
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{
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int unit = id->id_unit;
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int iobase = id->id_iobase;
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int irq = id->id_irq;
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int drq = id->id_drq;
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int irqnum;
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irqnum = ffs (irq) - 1;
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print (("cx%d: probe iobase=0x%x irq=%d drq=%d\n",
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unit, iobase, irqnum, drq));
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if (! valid (irqnum, irq_valid_values)) {
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printf ("cx%d: Incorrect IRQ: %d\n", unit, irqnum);
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return (0);
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}
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if (! valid (iobase, port_valid_values)) {
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printf ("cx%d: Incorrect port address: 0x%x\n", unit, iobase);
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return (0);
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}
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if (! valid (drq, drq_valid_values)) {
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printf ("cx%d: Incorrect DMA channel: %d\n", unit, drq);
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return (0);
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}
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if (! cx_probe_board (iobase))
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return (0);
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return (1);
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}
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/*
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* The adapter is present, initialize the driver structures.
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*/
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#ifdef DEVFS
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static void *cx_devfs_token;
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#endif
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static int
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cxattach (struct isa_device *id)
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{
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int unit = id->id_unit;
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int iobase = id->id_iobase;
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int irq = id->id_irq;
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int drq = id->id_drq;
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cx_board_t *b = cxboard + unit;
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int i;
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struct sppp *sp;
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/* Initialize the board structure. */
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cx_init (b, unit, iobase, ffs(irq)-1, drq);
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for (i=0; i<NCHAN; ++i) {
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cx_chan_t *c = b->chan + i;
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int u = b->num*NCHAN + i;
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cxchan[u] = c;
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if (c->type == T_NONE)
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continue;
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/* Allocate the buffer memory. */
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c->arbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
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c->brbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
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c->atbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
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c->btbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
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/* All buffers should be located in lower 16M of memory! */
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if (!c->arbuf || !c->brbuf || !c->atbuf || !c->btbuf) {
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printf ("cx%d.%d: No memory for channel buffers\n",
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c->board->num, c->num);
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c->type = T_NONE;
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}
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switch (c->type) {
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case T_SYNC_RS232:
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case T_SYNC_V35:
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case T_SYNC_RS449:
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case T_UNIV_RS232:
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case T_UNIV_RS449:
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case T_UNIV_V35:
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c->ifp = malloc (IFSTRUCTSZ, M_DEVBUF, M_NOWAIT);
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if (! c->ifp) {
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printf ("cx%d.%d: No memory for ifnet buffer\n",
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c->board->num, c->num);
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c->type = T_NONE;
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continue;
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}
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bzero (c->ifp, IFSTRUCTSZ);
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c->master = c->ifp;
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c->ifp->if_softc = c;
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c->ifp->if_unit = u;
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c->ifp->if_name = "cx";
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c->ifp->if_mtu = PP_MTU;
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c->ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
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c->ifp->if_ioctl = cxsioctl;
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c->ifp->if_start = (start_func_t) cxstart;
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c->ifp->if_watchdog = (watchdog_func_t) cxwatchdog;
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/* Init routine is never called by upper level? */
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sppp_attach (c->ifp);
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if_attach (c->ifp);
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/*
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* Shortcut the sppp tls/tlf actions to up/down
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* events since our lower layer is always ready.
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*/
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sp = (struct sppp*) c->ifp;
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sp->pp_tls = sp->pp_up;
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sp->pp_tlf = sp->pp_down;
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#if NBPFILTER > 0
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/* If BPF is in the kernel, call the attach for it. */
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bpfattach (c->ifp, DLT_PPP, PPP_HEADER_LEN);
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#endif
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}
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}
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/* Reset the adapter. */
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cx_setup_board (b);
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/* Activate the timeout routine. */
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if (unit == 0)
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timeout (cxtimeout, 0, hz*5);
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printf ("cx%d: <Cronyx-%s>\n", unit, b->name);
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#ifdef DEVFS
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cx_devfs_token =
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devfs_add_devswf(&cx_cdevsw, 0, DV_CHR, 0, 0, 0600, "cx");
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#endif
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return (1);
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}
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struct isa_driver cxdriver = { cxprobe, cxattach, "cx" };
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/*
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* Process an ioctl request.
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*/
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static int
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cxsioctl (struct ifnet *ifp, int cmd, caddr_t data)
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{
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cx_chan_t *q, *c = ifp->if_softc;
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int error, s, was_up, should_be_up;
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/*
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* No socket ioctls while the channel is in async mode.
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*/
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if (c->type==T_NONE || c->mode==M_ASYNC)
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return (EINVAL);
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/*
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* Socket ioctls on slave subchannels are not allowed.
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*/
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if (c->master != c->ifp)
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return (EBUSY);
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was_up = (ifp->if_flags & IFF_RUNNING) != 0;
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error = sppp_ioctl (ifp, cmd, data);
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if (error)
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return (error);
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print (("cxioctl (%d.%d, ", c->board->num, c->num));
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switch (cmd) {
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default:
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print (("0x%x)\n", cmd));
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return (0);
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case SIOCADDMULTI:
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print (("SIOCADDMULTI)\n"));
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return (0);
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case SIOCDELMULTI:
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print (("SIOCDELMULTI)\n"));
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return (0);
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case SIOCSIFFLAGS:
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print (("SIOCSIFFLAGS)\n"));
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break;
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case SIOCSIFADDR:
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print (("SIOCSIFADDR)\n"));
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break;
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}
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/* We get here only in case of SIFFLAGS or SIFADDR. */
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s = splimp ();
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should_be_up = (ifp->if_flags & IFF_RUNNING) != 0;
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if (!was_up && should_be_up) {
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/* Interface goes up -- start it. */
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cxup (c);
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/* Start all slave subchannels. */
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for (q=c->slaveq; q; q=q->slaveq)
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cxup (q);
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cxstart (c->ifp);
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} else if (was_up && !should_be_up) {
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/* Interface is going down -- stop it. */
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cxdown (c);
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/* Stop all slave subchannels. */
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for (q=c->slaveq; q; q=q->slaveq)
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cxdown (q);
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/* Flush the interface output queue */
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if (! c->sopt.ext)
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sppp_flush (c->ifp);
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}
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splx (s);
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return (0);
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}
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/*
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* Stop the interface. Called on splimp().
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*/
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static void
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cxdown (cx_chan_t *c)
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{
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unsigned short port = c->chip->port;
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print (("cx%d.%d: cxdown\n", c->board->num, c->num));
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/* The interface is down, stop it */
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c->ifp->if_flags &= ~IFF_OACTIVE;
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/* Reset the channel (for sync modes only) */
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outb (CAR(port), c->num & 3);
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outb (STCR(port), STC_ABORTTX | STC_SNDSPC);
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cx_setup_chan (c);
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}
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/*
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* Start the interface. Called on splimp().
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*/
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static void
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cxup (cx_chan_t *c)
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{
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unsigned short port = c->chip->port;
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/* The interface is up, start it */
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print (("cx%d.%d: cxup\n", c->board->num, c->num));
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/* Initialize channel, enable receiver and transmitter */
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cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX);
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/* Repeat the command, to avoid the rev.H bug */
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cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX);
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/* Start receiver */
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outw (ARBCNT(port), DMABUFSZ);
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outb (ARBSTS(port), BSTS_OWN24);
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outw (BRBCNT(port), DMABUFSZ);
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outb (BRBSTS(port), BSTS_OWN24);
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/* Raise DTR and RTS */
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cx_chan_dtr (c, 1);
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cx_chan_rts (c, 1);
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/* Enable interrupts */
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outb (IER(port), IER_RXD | IER_TXD);
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}
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/*
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* Fill transmitter buffer with data.
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*/
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static void
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cxput (cx_chan_t *c, char b)
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{
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struct mbuf *m;
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unsigned char *buf;
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unsigned short port = c->chip->port, len, cnt_port, sts_port;
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/* Choose the buffer. */
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if (b == 'A') {
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buf = c->atbuf;
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cnt_port = ATBCNT(port);
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sts_port = ATBSTS(port);
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} else {
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buf = c->btbuf;
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cnt_port = BTBCNT(port);
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sts_port = BTBSTS(port);
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}
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/* Is it busy? */
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if (inb (sts_port) & BSTS_OWN24) {
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if (c->ifp->if_flags & IFF_DEBUG)
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print (("cx%d.%d: tbuf %c already busy, bsts=%b\n",
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c->board->num, c->num, b,
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inb (sts_port), BSTS_BITS));
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goto ret;
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}
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/* Get the packet to send. */
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m = sppp_dequeue (c->master);
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if (! m)
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return;
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len = m->m_pkthdr.len;
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/* Count the transmitted bytes to the subchannel, not the master. */
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c->master->if_obytes -= len + 3;
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c->ifp->if_obytes += len + 3;
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c->stat->obytes += len + 3;
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if (len >= DMABUFSZ) {
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printf ("cx%d.%d: too long packet: %d bytes: ",
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c->board->num, c->num, len);
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printmbuf (m);
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m_freem (m);
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return;
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}
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m_copydata (m, 0, len, buf);
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#if NBPFILTER > 0
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if (c->ifp->if_bpf)
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bpf_mtap (c->ifp, m);
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#endif
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m_freem (m);
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/* Start transmitter. */
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outw (cnt_port, len);
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outb (sts_port, BSTS_EOFR | BSTS_INTR | BSTS_OWN24);
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if (c->ifp->if_flags & IFF_DEBUG)
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print (("cx%d.%d: enqueue %d bytes to %c\n",
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c->board->num, c->num, len, buf==c->atbuf ? 'A' : 'B'));
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ret:
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c->ifp->if_flags |= IFF_OACTIVE;
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}
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/*
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* Start output on the (slave) interface. Get another datagram to send
|
|
* off of the interface queue, and copy it to the interface
|
|
* before starting the output.
|
|
*/
|
|
static void
|
|
cxsend (cx_chan_t *c)
|
|
{
|
|
unsigned short port = c->chip->port;
|
|
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
print (("cx%d.%d: cxsend\n", c->board->num, c->num));
|
|
|
|
/* No output if the interface is down. */
|
|
if (! (c->ifp->if_flags & IFF_RUNNING))
|
|
return;
|
|
|
|
/* Set the current channel number. */
|
|
outb (CAR(port), c->num & 3);
|
|
|
|
/* Determine the buffer order. */
|
|
if (inb (DMABSTS(port)) & DMABSTS_NTBUF) {
|
|
cxput (c, 'B');
|
|
cxput (c, 'A');
|
|
} else {
|
|
cxput (c, 'A');
|
|
cxput (c, 'B');
|
|
}
|
|
|
|
/* Set up transmit timeout. */
|
|
if (c->master->if_flags & IFF_OACTIVE)
|
|
c->master->if_timer = TXTIMEOUT;
|
|
|
|
/*
|
|
* Enable TXMPTY interrupt,
|
|
* to catch the case when the second buffer is empty.
|
|
*/
|
|
if ((inb (ATBSTS(port)) & BSTS_OWN24) &&
|
|
(inb (BTBSTS(port)) & BSTS_OWN24)) {
|
|
outb (IER(port), IER_RXD | IER_TXD | IER_TXMPTY);
|
|
} else
|
|
outb (IER(port), IER_RXD | IER_TXD);
|
|
}
|
|
|
|
/*
|
|
* Start output on the (master) interface and all slave interfaces.
|
|
* Always called on splimp().
|
|
*/
|
|
static void
|
|
cxstart (struct ifnet *ifp)
|
|
{
|
|
cx_chan_t *q, *c = ifp->if_softc;
|
|
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
print (("cx%d.%d: cxstart\n", c->board->num, c->num));
|
|
|
|
/* Start the master subchannel. */
|
|
cxsend (c);
|
|
|
|
/* Start all slave subchannels. */
|
|
if (c->slaveq && ! sppp_isempty (c->master))
|
|
for (q=c->slaveq; q; q=q->slaveq)
|
|
if ((q->ifp->if_flags & IFF_RUNNING) &&
|
|
! (q->ifp->if_flags & IFF_OACTIVE))
|
|
cxsend (q);
|
|
}
|
|
|
|
/*
|
|
* Handle transmit timeouts.
|
|
* Recover after lost transmit interrupts.
|
|
* Always called on splimp().
|
|
*/
|
|
static void
|
|
cxwatchdog (struct ifnet *ifp)
|
|
{
|
|
cx_chan_t *q, *c = ifp->if_softc;
|
|
|
|
if (! (ifp->if_flags & IFF_RUNNING))
|
|
return;
|
|
if (ifp->if_flags & IFF_DEBUG)
|
|
printf ("cx%d.%d: device timeout\n", c->board->num, c->num);
|
|
|
|
cxdown (c);
|
|
for (q=c->slaveq; q; q=q->slaveq)
|
|
cxdown (q);
|
|
|
|
cxup (c);
|
|
for (q=c->slaveq; q; q=q->slaveq)
|
|
cxup (q);
|
|
|
|
cxstart (ifp);
|
|
}
|
|
|
|
/*
|
|
* Handle receive interrupts, including receive errors and
|
|
* receive timeout interrupt.
|
|
*/
|
|
static void
|
|
cxrinth (cx_chan_t *c)
|
|
{
|
|
unsigned short port = c->chip->port;
|
|
unsigned short len, risr = inw (RISR(port));
|
|
|
|
/* Receive errors. */
|
|
if (risr & (RIS_BUSERR | RIS_OVERRUN | RISH_CRCERR | RISH_RXABORT)) {
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
printf ("cx%d.%d: receive error, risr=%b\n",
|
|
c->board->num, c->num, risr, RISH_BITS);
|
|
++c->ifp->if_ierrors;
|
|
++c->stat->ierrs;
|
|
if (risr & RIS_OVERRUN)
|
|
++c->ifp->if_collisions;
|
|
} else if (risr & RIS_EOBUF) {
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
print (("cx%d.%d: hdlc receive interrupt, risr=%b, arbsts=%b, brbsts=%b\n",
|
|
c->board->num, c->num, risr, RISH_BITS,
|
|
inb (ARBSTS(port)), BSTS_BITS,
|
|
inb (BRBSTS(port)), BSTS_BITS));
|
|
++c->stat->ipkts;
|
|
|
|
/* Handle received data. */
|
|
len = (risr & RIS_BB) ? inw(BRBCNT(port)) : inw(ARBCNT(port));
|
|
c->stat->ibytes += len;
|
|
if (len > DMABUFSZ) {
|
|
/* Fatal error: actual DMA transfer size
|
|
* exceeds our buffer size. It could be caused
|
|
* by incorrectly programmed DMA register or
|
|
* hardware fault. Possibly, should panic here. */
|
|
printf ("cx%d.%d: panic! DMA buffer overflow: %d bytes\n",
|
|
c->board->num, c->num, len);
|
|
++c->ifp->if_ierrors;
|
|
} else if (! (risr & RIS_EOFR)) {
|
|
/* The received frame does not fit in the DMA buffer.
|
|
* It could be caused by serial lie noise,
|
|
* or if the peer has too big MTU. */
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
printf ("cx%d.%d: received frame length exceeds MTU, risr=%b\n",
|
|
c->board->num, c->num, risr, RISH_BITS);
|
|
++c->ifp->if_ierrors;
|
|
} else {
|
|
/* Valid frame received. */
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
print (("cx%d.%d: hdlc received %d bytes\n",
|
|
c->board->num, c->num, len));
|
|
cxinput (c, (risr & RIS_BB) ? c->brbuf : c->arbuf, len);
|
|
++c->ifp->if_ipackets;
|
|
}
|
|
} else if (c->ifp->if_flags & IFF_DEBUG) {
|
|
print (("cx%d.%d: unknown hdlc receive interrupt, risr=%b\n",
|
|
c->board->num, c->num, risr, RISH_BITS));
|
|
++c->stat->ierrs;
|
|
}
|
|
|
|
/* Restart receiver. */
|
|
if (! (inb (ARBSTS(port)) & BSTS_OWN24)) {
|
|
outw (ARBCNT(port), DMABUFSZ);
|
|
outb (ARBSTS(port), BSTS_OWN24);
|
|
}
|
|
if (! (inb (BRBSTS(port)) & BSTS_OWN24)) {
|
|
outw (BRBCNT(port), DMABUFSZ);
|
|
outb (BRBSTS(port), BSTS_OWN24);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle transmit interrupt.
|
|
*/
|
|
static int
|
|
cxtinth (cx_chan_t *c)
|
|
{
|
|
unsigned short port = c->chip->port;
|
|
unsigned char tisr = inb (TISR(port));
|
|
unsigned char teoir = 0;
|
|
|
|
c->ifp->if_flags &= ~IFF_OACTIVE;
|
|
if (c->ifp == c->master)
|
|
c->ifp->if_timer = 0;
|
|
|
|
if (tisr & (TIS_BUSERR | TIS_UNDERRUN)) {
|
|
/* if (c->ifp->if_flags & IFF_DEBUG) */
|
|
print (("cx%d.%d: transmit error, tisr=%b, atbsts=%b, btbsts=%b\n",
|
|
c->board->num, c->num, tisr, TIS_BITS,
|
|
inb (ATBSTS(port)), BSTS_BITS,
|
|
inb (BTBSTS(port)), BSTS_BITS));
|
|
++c->ifp->if_oerrors;
|
|
++c->stat->oerrs;
|
|
|
|
/* Terminate the failed buffer. */
|
|
/* teoir = TEOI_TERMBUFF; */
|
|
} else if (c->ifp->if_flags & IFF_DEBUG)
|
|
print (("cx%d.%d: hdlc transmit interrupt, tisr=%b, atbsts=%b, btbsts=%b\n",
|
|
c->board->num, c->num, tisr, TIS_BITS,
|
|
inb (ATBSTS(port)), BSTS_BITS,
|
|
inb (BTBSTS(port)), BSTS_BITS));
|
|
|
|
if (tisr & TIS_EOFR) {
|
|
++c->ifp->if_opackets;
|
|
++c->stat->opkts;
|
|
}
|
|
|
|
/* Start output on the (sub-) channel. */
|
|
cxsend (c);
|
|
|
|
return (teoir);
|
|
}
|
|
|
|
void
|
|
cxintr (int bnum)
|
|
{
|
|
cx_board_t *b = cxboard + bnum;
|
|
while (! (inw (BSR(b->port)) & BSR_NOINTR)) {
|
|
/* Acknowledge the interrupt to enter the interrupt context. */
|
|
/* Read the local interrupt vector register. */
|
|
unsigned char livr = inb (IACK(b->port, BRD_INTR_LEVEL));
|
|
cx_chan_t *c = b->chan + (livr>>2 & 0xf);
|
|
unsigned short port = c->chip->port;
|
|
unsigned short eoiport = REOIR(port);
|
|
unsigned char eoi = 0;
|
|
|
|
if (c->type == T_NONE) {
|
|
printf ("cx%d.%d: unexpected interrupt, livr=0x%x\n",
|
|
c->board->num, c->num, livr);
|
|
continue; /* incorrect channel number? */
|
|
}
|
|
/* print (("cx%d.%d: interrupt, livr=0x%x\n",
|
|
c->board->num, c->num, livr)); */
|
|
|
|
/* Clear RTS to stop receiver data flow while we are busy
|
|
* processing the interrupt, thus avoiding underruns. */
|
|
if (! c->sopt.norts) {
|
|
outb (MSVR_RTS(port), 0);
|
|
c->rts = 0;
|
|
}
|
|
|
|
switch (livr & 3) {
|
|
case LIV_EXCEP: /* receive exception */
|
|
case LIV_RXDATA: /* receive interrupt */
|
|
++c->stat->rintr;
|
|
switch (c->mode) {
|
|
case M_ASYNC: eoi = cxrinta (c); break;
|
|
case M_HDLC: cxrinth (c); break;
|
|
default:; /* No bisync and X.21 yet */
|
|
}
|
|
break;
|
|
case LIV_TXDATA: /* transmit interrupt */
|
|
++c->stat->tintr;
|
|
eoiport = TEOIR(port);
|
|
switch (c->mode) {
|
|
case M_ASYNC: cxtinta (c); break;
|
|
case M_HDLC: eoi = cxtinth (c); break;
|
|
default:; /* No bisync and X.21 yet */
|
|
}
|
|
break;
|
|
case LIV_MODEM: /* modem/timer interrupt */
|
|
++c->stat->mintr;
|
|
eoiport = MEOIR(port);
|
|
cxmint (c);
|
|
break;
|
|
}
|
|
|
|
/* Raise RTS for this channel if and only if
|
|
* both receive buffers are empty. */
|
|
if (! c->sopt.norts && (inb (CSR(port)) & CSRA_RXEN) &&
|
|
(inb (ARBSTS(port)) & BSTS_OWN24) &&
|
|
(inb (BRBSTS(port)) & BSTS_OWN24)) {
|
|
outb (MSVR_RTS(port), MSV_RTS);
|
|
c->rts = 1;
|
|
}
|
|
|
|
/* Exit from interrupt context. */
|
|
outb (eoiport, eoi);
|
|
|
|
/* Master channel - start output on all idle subchannels. */
|
|
if (c->master == c->ifp && c->slaveq &&
|
|
(livr & 3) == LIV_TXDATA && c->mode == M_HDLC &&
|
|
! sppp_isempty (c->ifp)) {
|
|
cx_chan_t *q;
|
|
|
|
for (q=c->slaveq; q; q=q->slaveq)
|
|
if ((q->ifp->if_flags & IFF_RUNNING) &&
|
|
! (q->ifp->if_flags & IFF_OACTIVE))
|
|
cxsend (q);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process the received packet.
|
|
*/
|
|
static void
|
|
cxinput (cx_chan_t *c, void *buf, unsigned len)
|
|
{
|
|
/* Make an mbuf. */
|
|
struct mbuf *m = makembuf (buf, len);
|
|
if (! m) {
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
printf ("cx%d.%d: no memory for packet\n",
|
|
c->board->num, c->num);
|
|
++c->ifp->if_iqdrops;
|
|
return;
|
|
}
|
|
m->m_pkthdr.rcvif = c->master;
|
|
#ifdef DEBUG
|
|
if (c->ifp->if_flags & IFF_DEBUG)
|
|
printmbuf (m);
|
|
#endif
|
|
|
|
#if NBPFILTER > 0
|
|
/*
|
|
* Check if there's a BPF listener on this interface.
|
|
* If so, hand off the raw packet to bpf.
|
|
*/
|
|
if (c->ifp->if_bpf)
|
|
bpf_tap (c->ifp, buf, len);
|
|
#endif
|
|
|
|
/* Count the received bytes to the subchannel, not the master. */
|
|
c->master->if_ibytes -= len + 3;
|
|
c->ifp->if_ibytes += len + 3;
|
|
|
|
sppp_input (c->master, m);
|
|
}
|
|
|
|
void cxswitch (cx_chan_t *c, cx_soft_opt_t new)
|
|
{
|
|
new.ext = 0;
|
|
if (! new.ext) {
|
|
struct sppp *sp = (struct sppp*) c->ifp;
|
|
|
|
if (new.cisco)
|
|
sp->pp_flags |= PP_CISCO;
|
|
else
|
|
sp->pp_flags &= ~PP_CISCO;
|
|
if (new.keepalive)
|
|
sp->pp_flags |= PP_KEEPALIVE;
|
|
else
|
|
sp->pp_flags &= ~PP_KEEPALIVE;
|
|
}
|
|
c->sopt = new;
|
|
}
|