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1ae5dc342a
Now that core network takes care of trans_start updates, dont do it in drivers themselves, if possible. Drivers can avoid one cache miss (on dev->trans_start) in their start_xmit() handler. Exceptions are NETIF_F_LLTX drivers Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1102 lines
30 KiB
C
1102 lines
30 KiB
C
/*
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* Linux ARCnet driver - device-independent routines
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*
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* Written 1997 by David Woodhouse.
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* Written 1994-1999 by Avery Pennarun.
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* Written 1999-2000 by Martin Mares <mj@ucw.cz>.
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* Derived from skeleton.c by Donald Becker.
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*
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* Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
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* for sponsoring the further development of this driver.
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*
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* **********************
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*
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* The original copyright was as follows:
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*
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* skeleton.c Written 1993 by Donald Becker.
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* Copyright 1993 United States Government as represented by the
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* Director, National Security Agency. This software may only be used
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* and distributed according to the terms of the GNU General Public License as
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* modified by SRC, incorporated herein by reference.
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*
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* **********************
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*
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* The change log is now in a file called ChangeLog in this directory.
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*
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* Sources:
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* - Crynwr arcnet.com/arcether.com packet drivers.
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* - arcnet.c v0.00 dated 1/1/94 and apparently by
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* Donald Becker - it didn't work :)
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* - skeleton.c v0.05 dated 11/16/93 by Donald Becker
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* (from Linux Kernel 1.1.45)
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* - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
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* - The official ARCnet COM9026 data sheets (!) thanks to
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* Ken Cornetet <kcornete@nyx10.cs.du.edu>
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* - The official ARCnet COM20020 data sheets.
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* - Information on some more obscure ARCnet controller chips, thanks
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* to the nice people at SMSC.
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* - net/inet/eth.c (from kernel 1.1.50) for header-building info.
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* - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
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* - Textual information and more alternate source from Joachim Koenig
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* <jojo@repas.de>
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*/
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#define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <net/arp.h>
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#include <linux/init.h>
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#include <linux/arcdevice.h>
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#include <linux/jiffies.h>
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/* "do nothing" functions for protocol drivers */
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static void null_rx(struct net_device *dev, int bufnum,
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struct archdr *pkthdr, int length);
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static int null_build_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, uint8_t daddr);
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static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
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int length, int bufnum);
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static void arcnet_rx(struct net_device *dev, int bufnum);
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/*
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* one ArcProto per possible proto ID. None of the elements of
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* arc_proto_map are allowed to be NULL; they will get set to
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* arc_proto_default instead. It also must not be NULL; if you would like
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* to set it to NULL, set it to &arc_proto_null instead.
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*/
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struct ArcProto *arc_proto_map[256], *arc_proto_default,
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*arc_bcast_proto, *arc_raw_proto;
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static struct ArcProto arc_proto_null =
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{
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.suffix = '?',
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.mtu = XMTU,
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.is_ip = 0,
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.rx = null_rx,
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.build_header = null_build_header,
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.prepare_tx = null_prepare_tx,
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.continue_tx = NULL,
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.ack_tx = NULL
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};
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/* Exported function prototypes */
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int arcnet_debug = ARCNET_DEBUG;
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EXPORT_SYMBOL(arc_proto_map);
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EXPORT_SYMBOL(arc_proto_default);
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EXPORT_SYMBOL(arc_bcast_proto);
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EXPORT_SYMBOL(arc_raw_proto);
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EXPORT_SYMBOL(arcnet_unregister_proto);
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EXPORT_SYMBOL(arcnet_debug);
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EXPORT_SYMBOL(alloc_arcdev);
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EXPORT_SYMBOL(arcnet_interrupt);
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EXPORT_SYMBOL(arcnet_open);
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EXPORT_SYMBOL(arcnet_close);
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EXPORT_SYMBOL(arcnet_send_packet);
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EXPORT_SYMBOL(arcnet_timeout);
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/* Internal function prototypes */
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static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
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unsigned short type, const void *daddr,
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const void *saddr, unsigned len);
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static int arcnet_rebuild_header(struct sk_buff *skb);
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static int go_tx(struct net_device *dev);
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static int debug = ARCNET_DEBUG;
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module_param(debug, int, 0);
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MODULE_LICENSE("GPL");
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static int __init arcnet_init(void)
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{
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int count;
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arcnet_debug = debug;
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printk("arcnet loaded.\n");
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#ifdef ALPHA_WARNING
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BUGLVL(D_EXTRA) {
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printk("arcnet: ***\n"
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"arcnet: * Read arcnet.txt for important release notes!\n"
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"arcnet: *\n"
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"arcnet: * This is an ALPHA version! (Last stable release: v3.02) E-mail\n"
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"arcnet: * me if you have any questions, comments, or bug reports.\n"
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"arcnet: ***\n");
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}
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#endif
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/* initialize the protocol map */
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arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
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for (count = 0; count < 256; count++)
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arc_proto_map[count] = arc_proto_default;
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BUGLVL(D_DURING)
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printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
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sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
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sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
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sizeof(struct archdr));
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return 0;
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}
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static void __exit arcnet_exit(void)
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{
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}
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module_init(arcnet_init);
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module_exit(arcnet_exit);
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/*
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* Dump the contents of an sk_buff
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*/
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#if ARCNET_DEBUG_MAX & D_SKB
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void arcnet_dump_skb(struct net_device *dev,
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struct sk_buff *skb, char *desc)
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{
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char hdr[32];
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/* dump the packet */
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snprintf(hdr, sizeof(hdr), "%6s:%s skb->data:", dev->name, desc);
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print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
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16, 1, skb->data, skb->len, true);
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}
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EXPORT_SYMBOL(arcnet_dump_skb);
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#endif
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/*
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* Dump the contents of an ARCnet buffer
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*/
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#if (ARCNET_DEBUG_MAX & (D_RX | D_TX))
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static void arcnet_dump_packet(struct net_device *dev, int bufnum,
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char *desc, int take_arcnet_lock)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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int i, length;
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unsigned long flags = 0;
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static uint8_t buf[512];
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char hdr[32];
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/* hw.copy_from_card expects IRQ context so take the IRQ lock
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to keep it single threaded */
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if(take_arcnet_lock)
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spin_lock_irqsave(&lp->lock, flags);
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lp->hw.copy_from_card(dev, bufnum, 0, buf, 512);
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if(take_arcnet_lock)
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spin_unlock_irqrestore(&lp->lock, flags);
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/* if the offset[0] byte is nonzero, this is a 256-byte packet */
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length = (buf[2] ? 256 : 512);
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/* dump the packet */
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snprintf(hdr, sizeof(hdr), "%6s:%s packet dump:", dev->name, desc);
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print_hex_dump(KERN_DEBUG, hdr, DUMP_PREFIX_OFFSET,
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16, 1, buf, length, true);
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}
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#else
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#define arcnet_dump_packet(dev, bufnum, desc,take_arcnet_lock) do { } while (0)
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#endif
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/*
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* Unregister a protocol driver from the arc_proto_map. Protocol drivers
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* are responsible for registering themselves, but the unregister routine
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* is pretty generic so we'll do it here.
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*/
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void arcnet_unregister_proto(struct ArcProto *proto)
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{
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int count;
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if (arc_proto_default == proto)
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arc_proto_default = &arc_proto_null;
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if (arc_bcast_proto == proto)
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arc_bcast_proto = arc_proto_default;
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if (arc_raw_proto == proto)
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arc_raw_proto = arc_proto_default;
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for (count = 0; count < 256; count++) {
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if (arc_proto_map[count] == proto)
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arc_proto_map[count] = arc_proto_default;
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}
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}
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/*
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* Add a buffer to the queue. Only the interrupt handler is allowed to do
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* this, unless interrupts are disabled.
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*
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* Note: we don't check for a full queue, since there aren't enough buffers
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* to more than fill it.
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*/
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static void release_arcbuf(struct net_device *dev, int bufnum)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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int i;
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lp->buf_queue[lp->first_free_buf++] = bufnum;
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lp->first_free_buf %= 5;
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BUGLVL(D_DURING) {
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BUGMSG(D_DURING, "release_arcbuf: freed #%d; buffer queue is now: ",
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bufnum);
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for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
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BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
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BUGMSG2(D_DURING, "\n");
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}
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}
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/*
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* Get a buffer from the queue. If this returns -1, there are no buffers
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* available.
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*/
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static int get_arcbuf(struct net_device *dev)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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int buf = -1, i;
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if (!atomic_dec_and_test(&lp->buf_lock)) {
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/* already in this function */
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BUGMSG(D_NORMAL, "get_arcbuf: overlap (%d)!\n",
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lp->buf_lock.counter);
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}
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else { /* we can continue */
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if (lp->next_buf >= 5)
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lp->next_buf -= 5;
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if (lp->next_buf == lp->first_free_buf)
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BUGMSG(D_NORMAL, "get_arcbuf: BUG: no buffers are available??\n");
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else {
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buf = lp->buf_queue[lp->next_buf++];
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lp->next_buf %= 5;
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}
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}
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BUGLVL(D_DURING) {
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BUGMSG(D_DURING, "get_arcbuf: got #%d; buffer queue is now: ", buf);
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for (i = lp->next_buf; i != lp->first_free_buf; i = (i+1) % 5)
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BUGMSG2(D_DURING, "#%d ", lp->buf_queue[i]);
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BUGMSG2(D_DURING, "\n");
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}
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atomic_inc(&lp->buf_lock);
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return buf;
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}
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static int choose_mtu(void)
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{
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int count, mtu = 65535;
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/* choose the smallest MTU of all available encaps */
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for (count = 0; count < 256; count++) {
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if (arc_proto_map[count] != &arc_proto_null &&
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arc_proto_map[count]->mtu < mtu) {
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mtu = arc_proto_map[count]->mtu;
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}
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}
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return mtu == 65535 ? XMTU : mtu;
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}
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static const struct header_ops arcnet_header_ops = {
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.create = arcnet_header,
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.rebuild = arcnet_rebuild_header,
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};
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static const struct net_device_ops arcnet_netdev_ops = {
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.ndo_open = arcnet_open,
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.ndo_stop = arcnet_close,
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.ndo_start_xmit = arcnet_send_packet,
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.ndo_tx_timeout = arcnet_timeout,
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};
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/* Setup a struct device for ARCnet. */
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static void arcdev_setup(struct net_device *dev)
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{
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dev->type = ARPHRD_ARCNET;
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dev->netdev_ops = &arcnet_netdev_ops;
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dev->header_ops = &arcnet_header_ops;
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dev->hard_header_len = sizeof(struct archdr);
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dev->mtu = choose_mtu();
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dev->addr_len = ARCNET_ALEN;
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dev->tx_queue_len = 100;
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dev->broadcast[0] = 0x00; /* for us, broadcasts are address 0 */
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dev->watchdog_timeo = TX_TIMEOUT;
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/* New-style flags. */
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dev->flags = IFF_BROADCAST;
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}
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struct net_device *alloc_arcdev(const char *name)
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{
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struct net_device *dev;
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dev = alloc_netdev(sizeof(struct arcnet_local),
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name && *name ? name : "arc%d", arcdev_setup);
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if(dev) {
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struct arcnet_local *lp = netdev_priv(dev);
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spin_lock_init(&lp->lock);
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}
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return dev;
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}
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/*
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* Open/initialize the board. This is called sometime after booting when
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* the 'ifconfig' program is run.
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*
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* This routine should set everything up anew at each open, even registers
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* that "should" only need to be set once at boot, so that there is
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* non-reboot way to recover if something goes wrong.
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*/
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int arcnet_open(struct net_device *dev)
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{
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struct arcnet_local *lp = netdev_priv(dev);
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int count, newmtu, error;
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BUGMSG(D_INIT,"opened.");
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if (!try_module_get(lp->hw.owner))
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return -ENODEV;
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BUGLVL(D_PROTO) {
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BUGMSG(D_PROTO, "protocol map (default is '%c'): ",
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arc_proto_default->suffix);
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for (count = 0; count < 256; count++)
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BUGMSG2(D_PROTO, "%c", arc_proto_map[count]->suffix);
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BUGMSG2(D_PROTO, "\n");
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}
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BUGMSG(D_INIT, "arcnet_open: resetting card.\n");
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/* try to put the card in a defined state - if it fails the first
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* time, actually reset it.
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*/
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error = -ENODEV;
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if (ARCRESET(0) && ARCRESET(1))
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goto out_module_put;
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newmtu = choose_mtu();
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if (newmtu < dev->mtu)
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dev->mtu = newmtu;
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BUGMSG(D_INIT, "arcnet_open: mtu: %d.\n", dev->mtu);
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/* autodetect the encapsulation for each host. */
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memset(lp->default_proto, 0, sizeof(lp->default_proto));
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/* the broadcast address is special - use the 'bcast' protocol */
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for (count = 0; count < 256; count++) {
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if (arc_proto_map[count] == arc_bcast_proto) {
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lp->default_proto[0] = count;
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break;
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}
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}
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/* initialize buffers */
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atomic_set(&lp->buf_lock, 1);
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lp->next_buf = lp->first_free_buf = 0;
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release_arcbuf(dev, 0);
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release_arcbuf(dev, 1);
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release_arcbuf(dev, 2);
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release_arcbuf(dev, 3);
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lp->cur_tx = lp->next_tx = -1;
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lp->cur_rx = -1;
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lp->rfc1201.sequence = 1;
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/* bring up the hardware driver */
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if (lp->hw.open)
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lp->hw.open(dev);
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if (dev->dev_addr[0] == 0)
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BUGMSG(D_NORMAL, "WARNING! Station address 00 is reserved "
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"for broadcasts!\n");
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else if (dev->dev_addr[0] == 255)
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BUGMSG(D_NORMAL, "WARNING! Station address FF may confuse "
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"DOS networking programs!\n");
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BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
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if (ASTATUS() & RESETflag) {
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BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
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ACOMMAND(CFLAGScmd | RESETclear);
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}
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|
|
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BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
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/* make sure we're ready to receive IRQ's. */
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AINTMASK(0);
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udelay(1); /* give it time to set the mask before
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* we reset it again. (may not even be
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* necessary)
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*/
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BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
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lp->intmask = NORXflag | RECONflag;
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AINTMASK(lp->intmask);
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BUGMSG(D_DEBUG, "%s: %d: %s\n",__FILE__,__LINE__,__func__);
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|
|
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netif_start_queue(dev);
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|
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return 0;
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|
|
|
out_module_put:
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module_put(lp->hw.owner);
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return error;
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|
}
|
|
|
|
|
|
/* The inverse routine to arcnet_open - shuts down the card. */
|
|
int arcnet_close(struct net_device *dev)
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{
|
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struct arcnet_local *lp = netdev_priv(dev);
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|
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netif_stop_queue(dev);
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|
|
|
/* flush TX and disable RX */
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AINTMASK(0);
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ACOMMAND(NOTXcmd); /* stop transmit */
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ACOMMAND(NORXcmd); /* disable receive */
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mdelay(1);
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|
|
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/* shut down the card */
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lp->hw.close(dev);
|
|
module_put(lp->hw.owner);
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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,
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|
"create header from %d to %d; protocol %d (%Xh); size %u.\n",
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|
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);
|
|
}
|
|
|
|
|
|
/*
|
|
* Rebuild the ARCnet hard header. This is called after an ARP (or in the
|
|
* future other address resolution) has completed on this sk_buff. We now
|
|
* let ARP fill in the destination field.
|
|
*/
|
|
static int arcnet_rebuild_header(struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = skb->dev;
|
|
struct arcnet_local *lp = netdev_priv(dev);
|
|
int status = 0; /* default is failure */
|
|
unsigned short type;
|
|
uint8_t daddr=0;
|
|
struct ArcProto *proto;
|
|
/*
|
|
* XXX: Why not use skb->mac_len?
|
|
*/
|
|
if (skb->network_header - skb->mac_header != 2) {
|
|
BUGMSG(D_NORMAL,
|
|
"rebuild_header: shouldn't be here! (hdrsize=%d)\n",
|
|
(int)(skb->network_header - skb->mac_header));
|
|
return 0;
|
|
}
|
|
type = *(uint16_t *) skb_pull(skb, 2);
|
|
BUGMSG(D_DURING, "rebuild header for protocol %Xh\n", type);
|
|
|
|
if (type == ETH_P_IP) {
|
|
#ifdef CONFIG_INET
|
|
BUGMSG(D_DURING, "rebuild header for ethernet protocol %Xh\n", type);
|
|
status = arp_find(&daddr, skb) ? 1 : 0;
|
|
BUGMSG(D_DURING, " rebuilt: dest is %d; protocol %Xh\n",
|
|
daddr, type);
|
|
#endif
|
|
} else {
|
|
BUGMSG(D_NORMAL,
|
|
"I don't understand ethernet protocol %Xh addresses!\n", type);
|
|
dev->stats.tx_errors++;
|
|
dev->stats.tx_aborted_errors++;
|
|
}
|
|
|
|
/* if we couldn't resolve the address... give up. */
|
|
if (!status)
|
|
return 0;
|
|
|
|
/* add the _real_ header this time! */
|
|
proto = arc_proto_map[lp->default_proto[daddr]];
|
|
proto->build_header(skb, dev, type, daddr);
|
|
|
|
return 1; /* success */
|
|
}
|
|
|
|
|
|
|
|
/* 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 IRQ_HANDLED;
|
|
}
|
|
|
|
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, sizeof(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 */
|
|
}
|