--- /dev/null
+/*
+ * Linux ARCnet driver - device-independent routines
+ *
+ * Written 1997 by David Woodhouse.
+ * Written 1994-1999 by Avery Pennarun.
+ * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
+ * Derived from skeleton.c by Donald Becker.
+ *
+ * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
+ * for sponsoring the further development of this driver.
+ *
+ * **********************
+ *
+ * The original copyright was as follows:
+ *
+ * skeleton.c Written 1993 by Donald Becker.
+ * Copyright 1993 United States Government as represented by the
+ * Director, National Security Agency. This software may only be used
+ * and distributed according to the terms of the GNU General Public License as
+ * modified by SRC, incorporated herein by reference.
+ *
+ * **********************
+ *
+ * The change log is now in a file called ChangeLog in this directory.
+ *
+ * Sources:
+ * - Crynwr arcnet.com/arcether.com packet drivers.
+ * - arcnet.c v0.00 dated 1/1/94 and apparently by
+ * Donald Becker - it didn't work :)
+ * - skeleton.c v0.05 dated 11/16/93 by Donald Becker
+ * (from Linux Kernel 1.1.45)
+ * - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
+ * - The official ARCnet COM9026 data sheets (!) thanks to
+ * Ken Cornetet <kcornete@nyx10.cs.du.edu>
+ * - The official ARCnet COM20020 data sheets.
+ * - Information on some more obscure ARCnet controller chips, thanks
+ * to the nice people at SMSC.
+ * - net/inet/eth.c (from kernel 1.1.50) for header-building info.
+ * - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
+ * - Textual information and more alternate source from Joachim Koenig
+ * <jojo@repas.de>
+ */
+
+#define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <net/arp.h>
+#include <linux/init.h>
+#include <linux/arcdevice.h>
+#include <linux/jiffies.h>
+
+/* "do nothing" functions for protocol drivers */
+static void null_rx(struct net_device *dev, int bufnum,
+ struct archdr *pkthdr, int length);
+static int null_build_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, uint8_t daddr);
+static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
+ int length, int bufnum);
+
+static void arcnet_rx(struct net_device *dev, int bufnum);
+
+/*
+ * one ArcProto per possible proto ID. None of the elements of
+ * arc_proto_map are allowed to be NULL; they will get set to
+ * arc_proto_default instead. It also must not be NULL; if you would like
+ * to set it to NULL, set it to &arc_proto_null instead.
+ */
+ struct ArcProto *arc_proto_map[256], *arc_proto_default,
+ *arc_bcast_proto, *arc_raw_proto;
+
+static struct ArcProto arc_proto_null =
+{
+ .suffix = '?',
+ .mtu = XMTU,
+ .is_ip = 0,
+ .rx = null_rx,
+ .build_header = null_build_header,
+ .prepare_tx = null_prepare_tx,
+ .continue_tx = NULL,
+ .ack_tx = NULL
+};
+
+/* Exported function prototypes */
+int arcnet_debug = ARCNET_DEBUG;
+
+EXPORT_SYMBOL(arc_proto_map);
+EXPORT_SYMBOL(arc_proto_default);
+EXPORT_SYMBOL(arc_bcast_proto);
+EXPORT_SYMBOL(arc_raw_proto);
+EXPORT_SYMBOL(arcnet_unregister_proto);
+EXPORT_SYMBOL(arcnet_debug);
+EXPORT_SYMBOL(alloc_arcdev);
+EXPORT_SYMBOL(arcnet_interrupt);
+EXPORT_SYMBOL(arcnet_open);
+EXPORT_SYMBOL(arcnet_close);
+EXPORT_SYMBOL(arcnet_send_packet);
+EXPORT_SYMBOL(arcnet_timeout);
+
+/* Internal function prototypes */
+static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, const void *daddr,
+ const void *saddr, unsigned len);
+static int go_tx(struct net_device *dev);
+
+static int debug = ARCNET_DEBUG;
+module_param(debug, int, 0);
+MODULE_LICENSE("GPL");
+
+static int __init arcnet_init(void)
+{
+ int count;
+
+ arcnet_debug = debug;
+
+ printk("arcnet loaded.\n");
+
+#ifdef ALPHA_WARNING
+ BUGLVL(D_EXTRA) {
+ printk("arcnet: ***\n"
+ "arcnet: * Read arcnet.txt for important release notes!\n"
+ "arcnet: *\n"
+ "arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
+ "arcnet: * me if you have any questions, comments, or bug reports.\n"
+ "arcnet: ***\n");
+ }
+#endif
+
+ /* initialize the protocol map */
+ arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
+ for (count = 0; count < 256; count++)
+ arc_proto_map[count] = arc_proto_default;
+
+ BUGLVL(D_DURING)
+ printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
+ sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
+ sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
+ sizeof(struct archdr));
+
+ return 0;
+}
+
+static void __exit arcnet_exit(void)
+{
+}
+
+module_init(arcnet_init);
+module_exit(arcnet_exit);
+
+/*
+ * Dump the contents of an sk_buff
+ */
+#if ARCNET_DEBUG_MAX & D_SKB
+void arcnet_dump_skb(struct net_device *dev,
+ struct sk_buff *skb, char *desc)
+{
+ char hdr[32];
+
+ /* dump the packet */
+ snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
+ print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
+ 16, 1, skb->data, skb->len, true);
+}
+
+EXPORT_SYMBOL(arcnet_dump_skb);
+#endif
+
+
+/*
+ * Dump the contents of an ARCnet buffer
+ */
+#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
+static void arcnet_dump_packet(struct net_device *dev, int bufnum,
+ char *desc, int take_arcnet_lock)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ int i, length;
+ unsigned long flags = 0;
+ static uint8_t buf[512];
+ char hdr[32];
+
+ /* hw.copy_from_card expects IRQ context so take the IRQ lock
+ to keep it single threaded */
+ if(take_arcnet_lock)
+ spin_lock_irqsave(&lp->lock, flags);
+
+ lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
+ if(take_arcnet_lock)
+ spin_unlock_irqrestore(&lp->lock, flags);
+
+ /* if the offset[0] byte is nonzero, this is a 256-byte packet */
+ length = (buf[2] ? 256 : 512);
+
+ /* dump the packet */
+ snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
+ print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
+ 16, 1, buf, length, true);
+}
+
+#else
+
+#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
+
+#endif
+
+
+/*
+ * Unregister a protocol driver from the arc_proto_map. Protocol drivers
+ * are responsible for registering themselves, but the unregister routine
+ * is pretty generic so we'll do it here.
+ */
+void arcnet_unregister_proto(struct ArcProto *proto)
+{
+ int count;
+
+ if (arc_proto_default == proto)
+ arc_proto_default = &arc_proto_null;
+ if (arc_bcast_proto == proto)
+ arc_bcast_proto = arc_proto_default;
+ if (arc_raw_proto == proto)
+ arc_raw_proto = arc_proto_default;
+
+ for (count = 0; count < 256; count++) {
+ if (arc_proto_map[count] == proto)
+ arc_proto_map[count] = arc_proto_default;
+ }
+}
+
+
+/*
+ * Add a buffer to the queue. Only the interrupt handler is allowed to do
+ * this, unless interrupts are disabled.
+ *
+ * Note: we don't check for a full queue, since there aren't enough buffers
+ * to more than fill it.
+ */
+static void release_arcbuf(struct net_device *dev, int bufnum)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ int i;
+
+ lp->buf_queue[lp->first_free_buf++] = bufnum;
+ lp->first_free_buf %= 5;
+
+ BUGLVL(D_DURING) {
+ BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
+ bufnum);
+ for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
+ BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
+ BUGMSG2(D_DURING, "\n");
+ }
+}
+
+
+/*
+ * Get a buffer from the queue. If this returns -1, there are no buffers
+ * available.
+ */
+static int get_arcbuf(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ int buf = -1, i;
+
+ if (!atomic_dec_and_test(&lp->buf_lock)) {
+ /* already in this function */
+ BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
+ lp->buf_lock.counter);
+ }
+ else { /* we can continue */
+ if (lp->next_buf >= 5)
+ lp->next_buf -= 5;
+
+ if (lp->next_buf == lp->first_free_buf)
+ BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
+ else {
+ buf = lp->buf_queue[lp->next_buf++];
+ lp->next_buf %= 5;
+ }
+ }
+
+
+ BUGLVL(D_DURING) {
+ BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
+ for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
+ BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
+ BUGMSG2(D_DURING, "\n");
+ }
+
+ atomic_inc(&lp->buf_lock);
+ return buf;
+}
+
+
+static int choose_mtu(void)
+{
+ int count, mtu = 65535;
+
+ /* choose the smallest MTU of all available encaps */
+ for (count = 0; count < 256; count++) {
+ if (arc_proto_map[count] != &arc_proto_null &&
+ arc_proto_map[count]->mtu < mtu) {
+ mtu = arc_proto_map[count]->mtu;
+ }
+ }
+
+ return mtu == 65535 ? XMTU : mtu;
+}
+
+static const struct header_ops arcnet_header_ops = {
+ .create = arcnet_header,
+};
+
+static const struct net_device_ops arcnet_netdev_ops = {
+ .ndo_open = arcnet_open,
+ .ndo_stop = arcnet_close,
+ .ndo_start_xmit = arcnet_send_packet,
+ .ndo_tx_timeout = arcnet_timeout,
+};
+
+/* Setup a struct device for ARCnet. */
+static void arcdev_setup(struct net_device *dev)
+{
+ dev->type = ARPHRD_ARCNET;
+ dev->netdev_ops = &arcnet_netdev_ops;
+ dev->header_ops = &arcnet_header_ops;
+ dev->hard_header_len = sizeof(struct archdr);
+ dev->mtu = choose_mtu();
+
+ dev->addr_len = ARCNET_ALEN;
+ dev->tx_queue_len = 100;
+ dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
+ dev->watchdog_timeo = TX_TIMEOUT;
+
+ /* New-style flags. */
+ dev->flags = IFF_BROADCAST;
+
+}
+
+struct net_device *alloc_arcdev(const char *name)
+{
+ struct net_device *dev;
+
+ dev = alloc_netdev(sizeof(struct arcnet_local),
+ name && *name ? name : "arc%d", NET_NAME_UNKNOWN,
+ arcdev_setup);
+ if(dev) {
+ struct arcnet_local *lp = netdev_priv(dev);
+ spin_lock_init(&lp->lock);
+ }
+
+ return dev;
+}
+
+/*
+ * Open/initialize the board. This is called sometime after booting when
+ * the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even registers
+ * that "should" only need to be set once at boot, so that there is
+ * non-reboot way to recover if something goes wrong.
+ */
+int arcnet_open(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ int count, newmtu, error;
+
+ BUGMSG(D_INIT,"opened.");
+
+ if (!try_module_get(lp->hw.owner))
+ return -ENODEV;
+
+ BUGLVL(D_PROTO) {
+ BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
+ arc_proto_default->suffix);
+ for (count = 0; count < 256; count++)
+ BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
+ BUGMSG2(D_PROTO, "\n");
+ }
+
+
+ BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
+
+ /* try to put the card in a defined state - if it fails the first
+ * time, actually reset it.
+ */
+ error = -ENODEV;
+ if (ARCRESET(0) && ARCRESET(1))
+ goto out_module_put;
+
+ newmtu = choose_mtu();
+ if (newmtu < dev->mtu)
+ dev->mtu = newmtu;
+
+ BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
+
+ /* autodetect the encapsulation for each host. */
+ memset(lp->default_proto, 0, sizeof(lp->default_proto));
+
+ /* the broadcast address is special - use the 'bcast' protocol */
+ for (count = 0; count < 256; count++) {
+ if (arc_proto_map[count] == arc_bcast_proto) {
+ lp->default_proto[0] = count;
+ break;
+ }
+ }
+
+ /* initialize buffers */
+ atomic_set(&lp->buf_lock, 1);
+
+ lp->next_buf = lp->first_free_buf = 0;
+ release_arcbuf(dev, 0);
+ release_arcbuf(dev, 1);
+ release_arcbuf(dev, 2);
+ release_arcbuf(dev, 3);
+ lp->cur_tx = lp->next_tx = -1;
+ lp->cur_rx = -1;
+
+ lp->rfc1201.sequence = 1;
+
+ /* bring up the hardware driver */
+ if (lp->hw.open)
+ lp->hw.open(dev);
+
+ if (dev->dev_addr[0] == 0)
+ BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
+ "for broadcasts!\n");
+ else if (dev->dev_addr[0] == 255)
+ BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
+ "DOS networking programs!\n");
+
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+ if (ASTATUS() & RESETflag) {
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+ ACOMMAND(CFLAGScmd | RESETclear);
+ }
+
+
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+ /* make sure we're ready to receive IRQ's. */
+ AINTMASK(0);
+ udelay(1); /* give it time to set the mask before
+ * we reset it again. (may not even be
+ * necessary)
+ */
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+ lp->intmask = NORXflag | RECONflag;
+ AINTMASK(lp->intmask);
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+
+ netif_start_queue(dev);
+
+ return 0;
+
+ out_module_put:
+ module_put(lp->hw.owner);
+ return error;
+}
+
+
+/* The inverse routine to arcnet_open - shuts down the card. */
+int arcnet_close(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+
+ netif_stop_queue(dev);
+
+ /* flush TX and disable RX */
+ AINTMASK(0);
+ ACOMMAND(NOTXcmd); /* stop transmit */
+ ACOMMAND(NORXcmd); /* disable receive */
+ mdelay(1);
+
+ /* shut down the card */
+ lp->hw.close(dev);
+ module_put(lp->hw.owner);
+ return 0;
+}
+
+
+static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, const void *daddr,
+ const void *saddr, unsigned len)
+{
+ const struct arcnet_local *lp = netdev_priv(dev);
+ uint8_t _daddr, proto_num;
+ struct ArcProto *proto;
+
+ BUGMSG(D_DURING,
+ "create header from %d to %d; protocol %d (%Xh); size %u.\n",
+ saddr ? *(uint8_t *) saddr : -1,
+ daddr ? *(uint8_t *) daddr : -1,
+ type, type, len);
+
+ if (skb->len!=0 && len != skb->len)
+ BUGMSG(D_NORMAL, "arcnet_header: Yikes! skb->len(%d) != len(%d)!\n",
+ skb->len, len);
+
+
+ /* Type is host order - ? */
+ if(type == ETH_P_ARCNET) {
+ proto = arc_raw_proto;
+ BUGMSG(D_DEBUG, "arc_raw_proto used. proto='%c'\n",proto->suffix);
+ _daddr = daddr ? *(uint8_t *) daddr : 0;
+ }
+ else if (!daddr) {
+ /*
+ * if the dest addr isn't provided, we can't choose an encapsulation!
+ * Store the packet type (eg. ETH_P_IP) for now, and we'll push on a
+ * real header when we do rebuild_header.
+ */
+ *(uint16_t *) skb_push(skb, 2) = type;
+ /*
+ * XXX: Why not use skb->mac_len?
+ */
+ if (skb->network_header - skb->mac_header != 2)
+ BUGMSG(D_NORMAL, "arcnet_header: Yikes! diff (%d) is not 2!\n",
+ (int)(skb->network_header - skb->mac_header));
+ return -2; /* return error -- can't transmit yet! */
+ }
+ else {
+ /* otherwise, we can just add the header as usual. */
+ _daddr = *(uint8_t *) daddr;
+ proto_num = lp->default_proto[_daddr];
+ proto = arc_proto_map[proto_num];
+ BUGMSG(D_DURING, "building header for %02Xh using protocol '%c'\n",
+ proto_num, proto->suffix);
+ if (proto == &arc_proto_null && arc_bcast_proto != proto) {
+ BUGMSG(D_DURING, "actually, let's use '%c' instead.\n",
+ arc_bcast_proto->suffix);
+ proto = arc_bcast_proto;
+ }
+ }
+ return proto->build_header(skb, dev, type, _daddr);
+}
+
+/* Called by the kernel in order to transmit a packet. */
+netdev_tx_t arcnet_send_packet(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ struct archdr *pkt;
+ struct arc_rfc1201 *soft;
+ struct ArcProto *proto;
+ int txbuf;
+ unsigned long flags;
+ int freeskb, retval;
+
+ BUGMSG(D_DURING,
+ "transmit requested (status=%Xh, txbufs=%d/%d, len=%d, protocol %x)\n",
+ ASTATUS(), lp->cur_tx, lp->next_tx, skb->len,skb->protocol);
+
+ pkt = (struct archdr *) skb->data;
+ soft = &pkt->soft.rfc1201;
+ proto = arc_proto_map[soft->proto];
+
+ BUGMSG(D_SKB_SIZE, "skb: transmitting %d bytes to %02X\n",
+ skb->len, pkt->hard.dest);
+ BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "tx");
+
+ /* fits in one packet? */
+ if (skb->len - ARC_HDR_SIZE > XMTU && !proto->continue_tx) {
+ BUGMSG(D_NORMAL, "fixme: packet too large: compensating badly!\n");
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK; /* don't try again */
+ }
+
+ /* We're busy transmitting a packet... */
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&lp->lock, flags);
+ AINTMASK(0);
+ if(lp->next_tx == -1)
+ txbuf = get_arcbuf(dev);
+ else {
+ txbuf = -1;
+ }
+ if (txbuf != -1) {
+ if (proto->prepare_tx(dev, pkt, skb->len, txbuf) &&
+ !proto->ack_tx) {
+ /* done right away and we don't want to acknowledge
+ the package later - forget about it now */
+ dev->stats.tx_bytes += skb->len;
+ freeskb = 1;
+ } else {
+ /* do it the 'split' way */
+ lp->outgoing.proto = proto;
+ lp->outgoing.skb = skb;
+ lp->outgoing.pkt = pkt;
+
+ freeskb = 0;
+
+ if (proto->continue_tx &&
+ proto->continue_tx(dev, txbuf)) {
+ BUGMSG(D_NORMAL,
+ "bug! continue_tx finished the first time! "
+ "(proto='%c')\n", proto->suffix);
+ }
+ }
+ retval = NETDEV_TX_OK;
+ lp->next_tx = txbuf;
+ } else {
+ retval = NETDEV_TX_BUSY;
+ freeskb = 0;
+ }
+
+ BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
+ /* make sure we didn't ignore a TX IRQ while we were in here */
+ AINTMASK(0);
+
+ BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
+ lp->intmask |= TXFREEflag|EXCNAKflag;
+ AINTMASK(lp->intmask);
+ BUGMSG(D_DEBUG, "%s: %d: %s, status: %x\n",__FILE__,__LINE__,__func__,ASTATUS());
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+ if (freeskb) {
+ dev_kfree_skb(skb);
+ }
+ return retval; /* no need to try again */
+}
+
+
+/*
+ * Actually start transmitting a packet that was loaded into a buffer
+ * by prepare_tx. This should _only_ be called by the interrupt handler.
+ */
+static int go_tx(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+
+ BUGMSG(D_DURING, "go_tx: status=%Xh, intmask=%Xh, next_tx=%d, cur_tx=%d\n",
+ ASTATUS(), lp->intmask, lp->next_tx, lp->cur_tx);
+
+ if (lp->cur_tx != -1 || lp->next_tx == -1)
+ return 0;
+
+ BUGLVL(D_TX) arcnet_dump_packet(dev, lp->next_tx, "go_tx", 0);
+
+ lp->cur_tx = lp->next_tx;
+ lp->next_tx = -1;
+
+ /* start sending */
+ ACOMMAND(TXcmd | (lp->cur_tx << 3));
+
+ dev->stats.tx_packets++;
+ lp->lasttrans_dest = lp->lastload_dest;
+ lp->lastload_dest = 0;
+ lp->excnak_pending = 0;
+ lp->intmask |= TXFREEflag|EXCNAKflag;
+
+ return 1;
+}
+
+
+/* Called by the kernel when transmit times out */
+void arcnet_timeout(struct net_device *dev)
+{
+ unsigned long flags;
+ struct arcnet_local *lp = netdev_priv(dev);
+ int status = ASTATUS();
+ char *msg;
+
+ spin_lock_irqsave(&lp->lock, flags);
+ if (status & TXFREEflag) { /* transmit _DID_ finish */
+ msg = " - missed IRQ?";
+ } else {
+ msg = "";
+ dev->stats.tx_aborted_errors++;
+ lp->timed_out = 1;
+ ACOMMAND(NOTXcmd | (lp->cur_tx << 3));
+ }
+ dev->stats.tx_errors++;
+
+ /* make sure we didn't miss a TX or a EXC NAK IRQ */
+ AINTMASK(0);
+ lp->intmask |= TXFREEflag|EXCNAKflag;
+ AINTMASK(lp->intmask);
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+
+ if (time_after(jiffies, lp->last_timeout + 10*HZ)) {
+ BUGMSG(D_EXTRA, "tx timed out%s (status=%Xh, intmask=%Xh, dest=%02Xh)\n",
+ msg, status, lp->intmask, lp->lasttrans_dest);
+ lp->last_timeout = jiffies;
+ }
+
+ if (lp->cur_tx == -1)
+ netif_wake_queue(dev);
+}
+
+
+/*
+ * The typical workload of the driver: Handle the network interface
+ * interrupts. Establish which device needs attention, and call the correct
+ * chipset interrupt handler.
+ */
+irqreturn_t arcnet_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct arcnet_local *lp;
+ int recbuf, status, diagstatus, didsomething, boguscount;
+ int retval = IRQ_NONE;
+
+ BUGMSG(D_DURING, "\n");
+
+ BUGMSG(D_DURING, "in arcnet_interrupt\n");
+
+ lp = netdev_priv(dev);
+ BUG_ON(!lp);
+
+ spin_lock(&lp->lock);
+
+ /*
+ * RESET flag was enabled - if device is not running, we must clear it right
+ * away (but nothing else).
+ */
+ if (!netif_running(dev)) {
+ if (ASTATUS() & RESETflag)
+ ACOMMAND(CFLAGScmd | RESETclear);
+ AINTMASK(0);
+ spin_unlock(&lp->lock);
+ return retval;
+ }
+
+ BUGMSG(D_DURING, "in arcnet_inthandler (status=%Xh, intmask=%Xh)\n",
+ ASTATUS(), lp->intmask);
+
+ boguscount = 5;
+ do {
+ status = ASTATUS();
+ diagstatus = (status >> 8) & 0xFF;
+
+ BUGMSG(D_DEBUG, "%s: %d: %s: status=%x\n",
+ __FILE__,__LINE__,__func__,status);
+ didsomething = 0;
+
+ /*
+ * RESET flag was enabled - card is resetting and if RX is
+ * disabled, it's NOT because we just got a packet.
+ *
+ * The card is in an undefined state. Clear it out and start over.
+ */
+ if (status & RESETflag) {
+ BUGMSG(D_NORMAL, "spurious reset (status=%Xh)\n", status);
+ arcnet_close(dev);
+ arcnet_open(dev);
+
+ /* get out of the interrupt handler! */
+ break;
+ }
+ /*
+ * RX is inhibited - we must have received something. Prepare to
+ * receive into the next buffer.
+ *
+ * We don't actually copy the received packet from the card until
+ * after the transmit handler runs (and possibly launches the next
+ * tx); this should improve latency slightly if we get both types
+ * of interrupts at once.
+ */
+ recbuf = -1;
+ if (status & lp->intmask & NORXflag) {
+ recbuf = lp->cur_rx;
+ BUGMSG(D_DURING, "Buffer #%d: receive irq (status=%Xh)\n",
+ recbuf, status);
+
+ lp->cur_rx = get_arcbuf(dev);
+ if (lp->cur_rx != -1) {
+ BUGMSG(D_DURING, "enabling receive to buffer #%d\n",
+ lp->cur_rx);
+ ACOMMAND(RXcmd | (lp->cur_rx << 3) | RXbcasts);
+ }
+ didsomething++;
+ }
+
+ if((diagstatus & EXCNAKflag)) {
+ BUGMSG(D_DURING, "EXCNAK IRQ (diagstat=%Xh)\n",
+ diagstatus);
+
+ ACOMMAND(NOTXcmd); /* disable transmit */
+ lp->excnak_pending = 1;
+
+ ACOMMAND(EXCNAKclear);
+ lp->intmask &= ~(EXCNAKflag);
+ didsomething++;
+ }
+
+
+ /* a transmit finished, and we're interested in it. */
+ if ((status & lp->intmask & TXFREEflag) || lp->timed_out) {
+ lp->intmask &= ~(TXFREEflag|EXCNAKflag);
+
+ BUGMSG(D_DURING, "TX IRQ (stat=%Xh)\n", status);
+
+ if (lp->cur_tx != -1 && !lp->timed_out) {
+ if(!(status & TXACKflag)) {
+ if (lp->lasttrans_dest != 0) {
+ BUGMSG(D_EXTRA,
+ "transmit was not acknowledged! "
+ "(status=%Xh, dest=%02Xh)\n",
+ status, lp->lasttrans_dest);
+ dev->stats.tx_errors++;
+ dev->stats.tx_carrier_errors++;
+ } else {
+ BUGMSG(D_DURING,
+ "broadcast was not acknowledged; that's normal "
+ "(status=%Xh, dest=%02Xh)\n",
+ status, lp->lasttrans_dest);
+ }
+ }
+
+ if (lp->outgoing.proto &&
+ lp->outgoing.proto->ack_tx) {
+ int ackstatus;
+ if(status & TXACKflag)
+ ackstatus=2;
+ else if(lp->excnak_pending)
+ ackstatus=1;
+ else
+ ackstatus=0;
+
+ lp->outgoing.proto
+ ->ack_tx(dev, ackstatus);
+ }
+ }
+ if (lp->cur_tx != -1)
+ release_arcbuf(dev, lp->cur_tx);
+
+ lp->cur_tx = -1;
+ lp->timed_out = 0;
+ didsomething++;
+
+ /* send another packet if there is one */
+ go_tx(dev);
+
+ /* continue a split packet, if any */
+ if (lp->outgoing.proto && lp->outgoing.proto->continue_tx) {
+ int txbuf = get_arcbuf(dev);
+ if (txbuf != -1) {
+ if (lp->outgoing.proto->continue_tx(dev, txbuf)) {
+ /* that was the last segment */
+ dev->stats.tx_bytes += lp->outgoing.skb->len;
+ if(!lp->outgoing.proto->ack_tx)
+ {
+ dev_kfree_skb_irq(lp->outgoing.skb);
+ lp->outgoing.proto = NULL;
+ }
+ }
+ lp->next_tx = txbuf;
+ }
+ }
+ /* inform upper layers of idleness, if necessary */
+ if (lp->cur_tx == -1)
+ netif_wake_queue(dev);
+ }
+ /* now process the received packet, if any */
+ if (recbuf != -1) {
+ BUGLVL(D_RX) arcnet_dump_packet(dev, recbuf, "rx irq", 0);
+
+ arcnet_rx(dev, recbuf);
+ release_arcbuf(dev, recbuf);
+
+ didsomething++;
+ }
+ if (status & lp->intmask & RECONflag) {
+ ACOMMAND(CFLAGScmd | CONFIGclear);
+ dev->stats.tx_carrier_errors++;
+
+ BUGMSG(D_RECON, "Network reconfiguration detected (status=%Xh)\n",
+ status);
+ /* MYRECON bit is at bit 7 of diagstatus */
+ if(diagstatus & 0x80)
+ BUGMSG(D_RECON,"Put out that recon myself\n");
+
+ /* is the RECON info empty or old? */
+ if (!lp->first_recon || !lp->last_recon ||
+ time_after(jiffies, lp->last_recon + HZ * 10)) {
+ if (lp->network_down)
+ BUGMSG(D_NORMAL, "reconfiguration detected: cabling restored?\n");
+ lp->first_recon = lp->last_recon = jiffies;
+ lp->num_recons = lp->network_down = 0;
+
+ BUGMSG(D_DURING, "recon: clearing counters.\n");
+ } else { /* add to current RECON counter */
+ lp->last_recon = jiffies;
+ lp->num_recons++;
+
+ BUGMSG(D_DURING, "recon: counter=%d, time=%lds, net=%d\n",
+ lp->num_recons,
+ (lp->last_recon - lp->first_recon) / HZ,
+ lp->network_down);
+
+ /* if network is marked up;
+ * and first_recon and last_recon are 60+ apart;
+ * and the average no. of recons counted is
+ * > RECON_THRESHOLD/min;
+ * then print a warning message.
+ */
+ if (!lp->network_down &&
+ (lp->last_recon - lp->first_recon) <= HZ * 60 &&
+ lp->num_recons >= RECON_THRESHOLD) {
+ lp->network_down = 1;
+ BUGMSG(D_NORMAL, "many reconfigurations detected: cabling problem?\n");
+ } else if (!lp->network_down &&
+ lp->last_recon - lp->first_recon > HZ * 60) {
+ /* reset counters if we've gone for over a minute. */
+ lp->first_recon = lp->last_recon;
+ lp->num_recons = 1;
+ }
+ }
+ } else if (lp->network_down &&
+ time_after(jiffies, lp->last_recon + HZ * 10)) {
+ if (lp->network_down)
+ BUGMSG(D_NORMAL, "cabling restored?\n");
+ lp->first_recon = lp->last_recon = 0;
+ lp->num_recons = lp->network_down = 0;
+
+ BUGMSG(D_DURING, "not recon: clearing counters anyway.\n");
+ }
+
+ if(didsomething) {
+ retval |= IRQ_HANDLED;
+ }
+ }
+ while (--boguscount && didsomething);
+
+ BUGMSG(D_DURING, "arcnet_interrupt complete (status=%Xh, count=%d)\n",
+ ASTATUS(), boguscount);
+ BUGMSG(D_DURING, "\n");
+
+
+ AINTMASK(0);
+ udelay(1);
+ AINTMASK(lp->intmask);
+
+ spin_unlock(&lp->lock);
+ return retval;
+}
+
+
+/*
+ * This is a generic packet receiver that calls arcnet??_rx depending on the
+ * protocol ID found.
+ */
+static void arcnet_rx(struct net_device *dev, int bufnum)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ struct archdr pkt;
+ struct arc_rfc1201 *soft;
+ int length, ofs;
+
+ soft = &pkt.soft.rfc1201;
+
+ lp->hw.copy_from_card(dev, bufnum, 0, &pkt, ARC_HDR_SIZE);
+ if (pkt.hard.offset[0]) {
+ ofs = pkt.hard.offset[0];
+ length = 256 - ofs;
+ } else {
+ ofs = pkt.hard.offset[1];
+ length = 512 - ofs;
+ }
+
+ /* get the full header, if possible */
+ if (sizeof(pkt.soft) <= length)
+ lp->hw.copy_from_card(dev, bufnum, ofs, soft, sizeof(pkt.soft));
+ else {
+ memset(&pkt.soft, 0, sizeof(pkt.soft));
+ lp->hw.copy_from_card(dev, bufnum, ofs, soft, length);
+ }
+
+ BUGMSG(D_DURING, "Buffer #%d: received packet from %02Xh to %02Xh "
+ "(%d+4 bytes)\n",
+ bufnum, pkt.hard.source, pkt.hard.dest, length);
+
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += length + ARC_HDR_SIZE;
+
+ /* call the right receiver for the protocol */
+ if (arc_proto_map[soft->proto]->is_ip) {
+ BUGLVL(D_PROTO) {
+ struct ArcProto
+ *oldp = arc_proto_map[lp->default_proto[pkt.hard.source]],
+ *newp = arc_proto_map[soft->proto];
+
+ if (oldp != newp) {
+ BUGMSG(D_PROTO,
+ "got protocol %02Xh; encap for host %02Xh is now '%c'"
+ " (was '%c')\n", soft->proto, pkt.hard.source,
+ newp->suffix, oldp->suffix);
+ }
+ }
+
+ /* broadcasts will always be done with the last-used encap. */
+ lp->default_proto[0] = soft->proto;
+
+ /* in striking contrast, the following isn't a hack. */
+ lp->default_proto[pkt.hard.source] = soft->proto;
+ }
+ /* call the protocol-specific receiver. */
+ arc_proto_map[soft->proto]->rx(dev, bufnum, &pkt, length);
+}
+
+
+static void null_rx(struct net_device *dev, int bufnum,
+ struct archdr *pkthdr, int length)
+{
+ BUGMSG(D_PROTO,
+ "rx: don't know how to deal with proto %02Xh from host %02Xh.\n",
+ pkthdr->soft.rfc1201.proto, pkthdr->hard.source);
+}
+
+
+static int null_build_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, uint8_t daddr)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+
+ BUGMSG(D_PROTO,
+ "tx: can't build header for encap %02Xh; load a protocol driver.\n",
+ lp->default_proto[daddr]);
+
+ /* always fails */
+ return 0;
+}
+
+
+/* the "do nothing" prepare_tx function warns that there's nothing to do. */
+static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
+ int length, int bufnum)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+ struct arc_hardware newpkt;
+
+ BUGMSG(D_PROTO, "tx: no encap for this host; load a protocol driver.\n");
+
+ /* send a packet to myself -- will never get received, of course */
+ newpkt.source = newpkt.dest = dev->dev_addr[0];
+
+ /* only one byte of actual data (and it's random) */
+ newpkt.offset[0] = 0xFF;
+
+ lp->hw.copy_to_card(dev, bufnum, 0, &newpkt, ARC_HDR_SIZE);
+
+ return 1; /* done */
+}
Code Review / kvmfornfv.git / blobdiff