/*      $NetBSD: ofnet.c,v 1.63 2020/01/29 06:18:17 thorpej Exp $       */

/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofnet.c,v 1.63 2020/01/29 06:18:17 thorpej Exp $");

#include "ofnet.h"
#include "opt_inet.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/device.h>
#include <sys/disk.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>

#include <net/if.h>
#include <net/if_ether.h>
#include <net/bpf.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif

#include <dev/ofw/openfirm.h>

struct ofnet_softc {
       device_t sc_dev;
       int sc_phandle;
       int sc_ihandle;
       struct ethercom sc_ethercom;
       struct callout sc_callout;
};

static int ofnet_match (device_t, cfdata_t, void *);
static void ofnet_attach (device_t, device_t, void *);

CFATTACH_DECL_NEW(ofnet, sizeof(struct ofnet_softc),
   ofnet_match, ofnet_attach, NULL, NULL);

static void ofnet_read (struct ofnet_softc *);
static void ofnet_timer (void *);
static void ofnet_init (struct ofnet_softc *);
static void ofnet_stop (struct ofnet_softc *);

static void ofnet_start (struct ifnet *);
static int ofnet_ioctl (struct ifnet *, u_long, void *);
static void ofnet_watchdog (struct ifnet *);

static int
ofnet_match(device_t parent, cfdata_t match, void *aux)
{
       struct ofbus_attach_args *oba = aux;
       char type[32];
       int l;

       if (strcmp(oba->oba_busname, "ofw"))
               return (0);
       if ((l = OF_getprop(oba->oba_phandle, "device_type", type,
           sizeof type - 1)) < 0)
               return 0;
       if (l >= sizeof type)
               return 0;
       type[l] = 0;
       if (strcmp(type, "network"))
               return 0;
       return 1;
}

static void
ofnet_attach(device_t parent, device_t self, void *aux)
{
       struct ofnet_softc *of = device_private(self);
       struct ifnet *ifp = &of->sc_ethercom.ec_if;
       struct ofbus_attach_args *oba = aux;
       char path[256];
       int l;
       u_int8_t myaddr[ETHER_ADDR_LEN];

       of->sc_dev = self;

       of->sc_phandle = oba->oba_phandle;

       if ((l = OF_package_to_path(oba->oba_phandle, path,
           sizeof path - 1)) < 0 ||
           l >= sizeof path ||
           (path[l] = 0, !(of->sc_ihandle = OF_open(path))))
               panic("ofnet_attach: unable to open");
       if (OF_getprop(oba->oba_phandle, "mac-address", myaddr,
           sizeof myaddr) < 0)
               panic("ofnet_attach: no mac-address");
       printf(": address %s\n", ether_sprintf(myaddr));

       callout_init(&of->sc_callout, 0);

       strlcpy(ifp->if_xname, device_xname(of->sc_dev), IFNAMSIZ);
       ifp->if_softc = of;
       ifp->if_start = ofnet_start;
       ifp->if_ioctl = ofnet_ioctl;
       ifp->if_watchdog = ofnet_watchdog;
       ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX;
       IFQ_SET_READY(&ifp->if_snd);

       if_attach(ifp);
       ether_ifattach(ifp, myaddr);
}

static char buf[ETHER_MAX_LEN];

static void
ofnet_read(struct ofnet_softc *of)
{
       struct ifnet *ifp = &of->sc_ethercom.ec_if;
       struct mbuf *m, **mp, *head;
       int s, l, len;
       char *bufp;

       s = splnet();

       for (;;) {
               len = OF_read(of->sc_ihandle, buf, sizeof buf);
               if (len == -2 || len == 0)
                       break;
               if (len < sizeof(struct ether_header)) {
                       if_statinc(ifp, if_ierrors);
                       continue;
               }
               bufp = buf;

               /*
                * We don't know if the interface included the FCS
                * or not.  For now, assume that it did if we got
                * a packet length that looks like it could include
                * the FCS.
                *
                * XXX Yuck.
                */
               if (len > ETHER_MAX_LEN - ETHER_CRC_LEN)
                       len = ETHER_MAX_LEN - ETHER_CRC_LEN;

               /* Allocate a header mbuf */
               MGETHDR(m, M_DONTWAIT, MT_DATA);
               if (m == 0) {
                       if_statinc(ifp, if_ierrors);
                       continue;
               }
               m_set_rcvif(m, ifp);
               m->m_pkthdr.len = len;

               l = MHLEN;
               head = 0;
               mp = &head;

               while (len > 0) {
                       if (head) {
                               MGET(m, M_DONTWAIT, MT_DATA);
                               if (m == 0) {
                                       if_statinc(ifp, if_ierrors);
                                       m_freem(head);
                                       head = 0;
                                       break;
                               }
                               l = MLEN;
                       }
                       if (len >= MINCLSIZE) {
                               MCLGET(m, M_DONTWAIT);
                               if ((m->m_flags & M_EXT) == 0) {
                                       if_statinc(ifp, if_ierrors);
                                       m_free(m);
                                       m_freem(head);
                                       head = 0;
                                       break;
                               }
                               l = MCLBYTES;
                       }

                       /*
                        * Make sure the data after the Ethernet header
                        * is aligned.
                        *
                        * XXX Assumes the device is an ethernet, but
                        * XXX then so does other code in this driver.
                        */
                       if (head == NULL) {
                               char *newdata = (char *)ALIGN(m->m_data +
                                     sizeof(struct ether_header)) -
                                   sizeof(struct ether_header);
                               l -= newdata - m->m_data;
                               m->m_data = newdata;
                       }

                       m->m_len = l = uimin(len, l);
                       memcpy(mtod(m, char *), bufp, l);
                       bufp += l;
                       len -= l;
                       *mp = m;
                       mp = &m->m_next;
               }
               if (head == 0)
                       continue;

               if_percpuq_enqueue(ifp->if_percpuq, head);
       }
       splx(s);
}

static void
ofnet_timer(void *arg)
{
       struct ofnet_softc *of = arg;

       ofnet_read(of);
       callout_reset(&of->sc_callout, 1, ofnet_timer, of);
}

static void
ofnet_init(struct ofnet_softc *of)
{
       struct ifnet *ifp = &of->sc_ethercom.ec_if;

       if (ifp->if_flags & IFF_RUNNING)
               return;

       ifp->if_flags |= IFF_RUNNING;
       /* Start reading from interface */
       ofnet_timer(of);
       /* Attempt to start output */
       ofnet_start(ifp);
}

static void
ofnet_stop(struct ofnet_softc *of)
{
       callout_stop(&of->sc_callout);
       of->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
}

static void
ofnet_start(struct ifnet *ifp)
{
       struct ofnet_softc *of = ifp->if_softc;
       struct mbuf *m, *m0;
       char *bufp;
       int len;

       if (!(ifp->if_flags & IFF_RUNNING))
               return;

       for (;;) {
               /* First try reading any packets */
               ofnet_read(of);

               /* Now get the first packet on the queue */
               IFQ_DEQUEUE(&ifp->if_snd, m0);
               if (!m0)
                       return;

               if (!(m0->m_flags & M_PKTHDR))
                       panic("ofnet_start: no header mbuf");
               len = m0->m_pkthdr.len;

               bpf_mtap(ifp, m0, BPF_D_OUT);

               if (len > ETHERMTU + sizeof(struct ether_header)) {
                       /* packet too large, toss it */
                       if_statinc(ifp, if_oerrors);
                       m_freem(m0);
                       continue;
               }

               for (bufp = buf; (m = m0) != NULL;) {
                       memcpy(bufp, mtod(m, char *), m->m_len);
                       bufp += m->m_len;
                       m0 = m_free(m);
               }

               /*
                * We don't know if the interface will auto-pad for
                * us, so make sure it's at least as large as a
                * minimum size Ethernet packet.
                */

               if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN)) {
                       memset(bufp, 0, ETHER_MIN_LEN - ETHER_CRC_LEN - len);
                       bufp += ETHER_MIN_LEN - ETHER_CRC_LEN - len;
               } else
                       len = bufp - buf;

               if (OF_write(of->sc_ihandle, buf, len) != len)
                       if_statinc(ifp, if_oerrors);
               else
                       if_statinc(ifp, if_opackets);
       }
}

static int
ofnet_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
       struct ofnet_softc *of = ifp->if_softc;
       struct ifaddr *ifa = (struct ifaddr *)data;
       /* struct ifreq *ifr = (struct ifreq *)data; */
       int error = 0;

       switch (cmd) {
       case SIOCINITIFADDR:
               ifp->if_flags |= IFF_UP;

               switch (ifa->ifa_addr->sa_family) {
#ifdef  INET
               case AF_INET:
                       arp_ifinit(ifp, ifa);
                       break;
#endif
               default:
                       break;
               }
               ofnet_init(of);
               break;
       case SIOCSIFFLAGS:
               if ((error = ifioctl_common(ifp, cmd, data)) != 0)
                       break;
               /* XXX re-use ether_ioctl() */
               switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
               case IFF_RUNNING:
                       /* If interface is down, but running, stop it. */
                       ofnet_stop(of);
                       break;
               case IFF_UP:
                       /* If interface is up, but not running, start it. */
                       ofnet_init(of);
                       break;
               default:
                       /* Other flags are ignored. */
                       break;
               }
               break;
       default:
               error = ether_ioctl(ifp, cmd, data);
               break;
       }
       return error;
}

static void
ofnet_watchdog(struct ifnet *ifp)
{
       struct ofnet_softc *of = ifp->if_softc;

       log(LOG_ERR, "%s: device timeout\n", device_xname(of->sc_dev));
       if_statinc(ifp, if_oerrors);
       ofnet_stop(of);
       ofnet_init(of);
}

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