/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. NET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions used by the ARCnet driver. * * Authors: Avery Pennarun and David Woodhouse
*/ #ifndef _LINUX_ARCDEVICE_H #define _LINUX_ARCDEVICE_H
/* * RECON_THRESHOLD is the maximum number of RECON messages to receive * within one minute before printing a "cabling problem" warning. The * default value should be fine. * * After that, a "cabling restored" message will be printed on the next IRQ * if no RECON messages have been received for 10 seconds. * * Do not define RECON_THRESHOLD at all if you want to disable this feature.
*/ #define RECON_THRESHOLD 30
/* * Define this to the minimum "timeout" value. If a transmit takes longer * than TX_TIMEOUT jiffies, Linux will abort the TX and retry. On a large * network, or one with heavy network traffic, this timeout may need to be * increased. The larger it is, though, the longer it will be between * necessary transmits - don't set this too high.
*/ #define TX_TIMEOUT (HZ * 200 / 1000)
/* Display warnings about the driver being an ALPHA version. */ #undef ALPHA_WARNING
/* * Debugging bitflags: each option can be enabled individually. * * Note: only debug flags included in the ARCNET_DEBUG_MAX define will * actually be available. GCC will (at least, GCC 2.7.0 will) notice * lines using a BUGLVL not in ARCNET_DEBUG_MAX and automatically optimize * them out.
*/ #define D_NORMAL 1 /* important operational info */ #define D_EXTRA 2 /* useful, but non-vital information */ #define D_INIT 4 /* show init/probe messages */ #define D_INIT_REASONS 8 /* show reasons for discarding probes */ #define D_RECON 32 /* print a message whenever token is lost */ #define D_PROTO 64 /* debug auto-protocol support */ /* debug levels below give LOTS of output during normal operation! */ #define D_DURING 128 /* trace operations (including irq's) */ #define D_TX 256 /* show tx packets */ #define D_RX 512 /* show rx packets */ #define D_SKB 1024 /* show skb's */ #define D_SKB_SIZE 2048 /* show skb sizes */ #define D_TIMING 4096 /* show time needed to copy buffers to card */ #define D_DEBUG 8192 /* Very detailed debug line for line */
#ifndef ARCNET_DEBUG_MAX #define ARCNET_DEBUG_MAX (127) /* change to ~0 if you want detailed debugging */ #endif
/* macros to simplify debug checking */ #define arc_printk(x, dev, fmt, ...) \ do { \ if (BUGLVL(x)) { \ if ((x) == D_NORMAL) \
netdev_warn(dev, fmt, ##__VA_ARGS__); \ elseif ((x) < D_DURING) \
netdev_info(dev, fmt, ##__VA_ARGS__); \ else \
netdev_dbg(dev, fmt, ##__VA_ARGS__); \
} \
} while (0)
#define arc_cont(x, fmt, ...) \ do { \ if (BUGLVL(x)) \
pr_cont(fmt, ##__VA_ARGS__); \
} while (0)
/* see how long a function call takes to run, expressed in CPU cycles */ #define TIME(dev, name, bytes, call) \ do { \ if (BUGLVL(D_TIMING)) { \ unsignedlong _x, _y; \
_x = get_cycles(); \
call; \
_y = get_cycles(); \
arc_printk(D_TIMING, dev, \ "%s: %d bytes in %lu cycles == %lu Kbytes/100Mcycle\n", \
name, bytes, _y - _x, \
100000000 / 1024 * bytes / (_y - _x + 1)); \
} else { \
call; \
} \
} while (0)
/* * Time needed to reset the card - in ms (milliseconds). This works on my * SMC PC100. I can't find a reference that tells me just how long I * should wait.
*/ #define RESETtime (300)
/* * These are the max/min lengths of packet payload, not including the * arc_hardware header, but definitely including the soft header. * * Note: packet sizes 254, 255, 256 are impossible because of the way * ARCnet registers work That's why RFC1201 defines "exception" packets. * In non-RFC1201 protocols, we have to just tack some extra bytes on the * end.
*/ #define MTU 253 /* normal packet max size */ #define MinTU 257 /* extended packet min size */ #define XMTU 508 /* extended packet max size */
/* status/interrupt mask bit fields */ #define TXFREEflag 0x01 /* transmitter available */ #define TXACKflag 0x02 /* transmitted msg. ackd */ #define RECONflag 0x04 /* network reconfigured */ #define TESTflag 0x08 /* test flag */ #define EXCNAKflag 0x08 /* excesive nak flag */ #define RESETflag 0x10 /* power-on-reset */ #define RES1flag 0x20 /* reserved - usually set by jumper */ #define RES2flag 0x40 /* reserved - usually set by jumper */ #define NORXflag 0x80 /* receiver inhibited */
/* Flags used for IO-mapped memory operations */ #define AUTOINCflag 0x40 /* Increase location with each access */ #define IOMAPflag 0x02 /* (for 90xx) Use IO mapped memory, not mmap */ #define ENABLE16flag 0x80 /* (for 90xx) Enable 16-bit mode */
/* card feature flags, set during auto-detection. * (currently only used by com20020pci)
*/ #define ARC_IS_5MBIT 1 /* card default speed is 5MBit */ #define ARC_CAN_10MBIT 2 /* card uses COM20022, supporting 10MBit,
but default is 2.5MBit. */ #define ARC_HAS_LED 4 /* card has software controlled LEDs */ #define ARC_HAS_ROTARY 8 /* card has rotary encoder */
/* information needed to define an encapsulation driver */ struct ArcProto { char suffix; /* a for RFC1201, e for ether-encap, etc. */ int mtu; /* largest possible packet */ int is_ip; /* This is a ip plugin - not a raw thing */
void (*rx)(struct net_device *dev, int bufnum, struct archdr *pkthdr, int length); int (*build_header)(struct sk_buff *skb, struct net_device *dev, unsignedshort ethproto, uint8_t daddr);
/* these functions return '1' if the skb can now be freed */ int (*prepare_tx)(struct net_device *dev, struct archdr *pkt, int length, int bufnum); int (*continue_tx)(struct net_device *dev, int bufnum); int (*ack_tx)(struct net_device *dev, int acked);
};
/* * "Incoming" is information needed for each address that could be sending * to us. Mostly for partially-received split packets.
*/ struct Incoming { struct sk_buff *skb; /* packet data buffer */
__be16 sequence; /* sequence number of assembly */
uint8_t lastpacket, /* number of last packet (from 1) */
numpackets; /* number of packets in split */
};
/* only needed for RFC1201 */ struct Outgoing { struct ArcProto *proto; /* protocol driver that owns this: * if NULL, no packet is pending.
*/ struct sk_buff *skb; /* buffer from upper levels */ struct archdr *pkt; /* a pointer into the skb */
uint16_t length, /* bytes total */
dataleft, /* bytes left */
segnum, /* segment being sent */
numsegs; /* number of segments */
};
#define ARCNET_LED_NAME_SZ (IFNAMSIZ + 6)
struct arcnet_local {
uint8_t config, /* current value of CONFIG register */
timeout, /* Extended timeout for COM20020 */
backplane, /* Backplane flag for COM20020 */
clockp, /* COM20020 clock divider */
clockm, /* COM20020 clock multiplier flag */
setup, /* Contents of setup1 register */
setup2, /* Contents of setup2 register */
intmask; /* current value of INTMASK register */
uint8_t default_proto[256]; /* default encap to use for each host */ int cur_tx, /* buffer used by current transmit, or -1 */
next_tx, /* buffer where a packet is ready to send */
cur_rx; /* current receive buffer */ int lastload_dest, /* can last loaded packet be acked? */
lasttrans_dest; /* can last TX'd packet be acked? */ int timed_out; /* need to process TX timeout and drop packet */ unsignedlong last_timeout; /* time of last reported timeout */ char *card_name; /* card ident string */ int card_flags; /* special card features */
/* On preemtive and SMB a lock is needed */
spinlock_t lock;
struct net_device *dev; int reply_status; struct work_struct reply_work;
/* * Buffer management: an ARCnet card has 4 x 512-byte buffers, each of * which can be used for either sending or receiving. The new dynamic * buffer management routines use a simple circular queue of available * buffers, and take them as they're needed. This way, we simplify * situations in which we (for example) want to pre-load a transmit * buffer, or start receiving while we copy a received packet to * memory. * * The rules: only the interrupt handler is allowed to _add_ buffers to * the queue; thus, this doesn't require a lock. Both the interrupt * handler and the transmit function will want to _remove_ buffers, so * we need to handle the situation where they try to do it at the same * time. * * If next_buf == first_free_buf, the queue is empty. Since there are * only four possible buffers, the queue should never be full.
*/
atomic_t buf_lock; int buf_queue[5]; int next_buf, first_free_buf;
/* network "reconfiguration" handling */ unsignedlong first_recon; /* time of "first" RECON message to count */ unsignedlong last_recon; /* time of most recent RECON */ int num_recons; /* number of RECONs between first and last. */ int network_down; /* do we think the network is down? */
int excnak_pending; /* We just got an excesive nak interrupt */
/* RESET flag handling */ int reset_in_progress; struct work_struct reset_work;
struct {
uint16_t sequence; /* sequence number (incs with each packet) */
__be16 aborted_seq;
struct Incoming incoming[256]; /* one from each address */
} rfc1201;
/* really only used by rfc1201, but we'll pretend it's not */ struct Outgoing outgoing; /* packet currently being sent */
/* hardware-specific functions */ struct { struct module *owner; void (*command)(struct net_device *dev, int cmd); int (*status)(struct net_device *dev); void (*intmask)(struct net_device *dev, int mask); int (*reset)(struct net_device *dev, int really_reset); void (*open)(struct net_device *dev); void (*close)(struct net_device *dev); void (*datatrigger) (struct net_device * dev, int enable); void (*recontrigger) (struct net_device * dev, int enable);
void (*copy_to_card)(struct net_device *dev, int bufnum, int offset, void *buf, int count); void (*copy_from_card)(struct net_device *dev, int bufnum, int offset, void *buf, int count);
} hw;
void __iomem *mem_start; /* pointer to ioremap'ed MMIO */
};
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