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freebsd-dev/sys/dev/le/lancevar.h
Marius Strobl 60c430f511 - Revert if_le_pci.c rev. 1.2; although lnc(4) is now gone, le_pci_probe() 
still should return BUS_PROBE_LOW_PRIORITY instead of BUS_PROBE_DEFAULT
  in order to give pcn(4) a chance to attach in case it probes after le(4).
- Rearrange the code related to RX interrupt handling so that ownership of
  RX descriptors is immediately returned to the NIC after we have copied
  the data of the hardware, allowing the NIC to already reuse the descriptor
  while we are processing the data in ifp->if_input(). This results in a
  small but measurable increase in RX throughput.
  As a side-effect, this moves the workaround for the LANCE revision C bug
  to am7900.c (still off by default as I doubt we will actually encounter
  such an old chip in a machine running FreeBSD) and the workaround for the
  bug in the VMware PCnet-PCI emulation to am79000.c, which is now also
  only compiled on i386 (resulting in a small increase in RX throughput on
  the other platforms).
- Change the RX interrupt handlers so that the descriptor error bits are
  only check once in case there was no error instead of twice (inspired
  by the NetBSD pcn(4), which additionally predicts the error branch as
  false).
- Fix the debugging output of the RX and TX interrupt handlers; while
  looping through the descriptors print info about the currently processed
  one instead of always the previously last used one; remove pointless
  printing of info about the RX descriptor bits after their values were
  reset.
- Create the DMA tags used to allocate the memory for the init block,
  descriptors and packet buffers with the alignment the respective NIC
  actually requires rather than using PAGE_SIZE unconditionally. This might
  as well fix the alignment of the memory as it seems we do not inherit
  the alignment constraint from the parent DMA tag.
- For the PCI variants double the number of RX descriptors and buffers
  from 8 to 16 as this minimizes the number of RX overflows im seeing with
  one NIC-mainboard combination. Nevertheless move reporting of overflows
  under debugging as they seem unavoidable with some crappy hardware.
- Set the software style of the PCI variants to ILACC rather than PCnet-PCI
  as the former is was am79000.c actually implements. Should not make a
  difference for this driver though.
- Fix the driver name part in the MODULE_DEPEND of the PCI front-end for
  ether.
- Use different device descriptions for PCnet-Home and PCnet-PCI.
- Fix some 0/NULL confusion in lance_get().
- Use bus_addr_t for sc_addr and bus_size_t for sc_memsize as these are
  more appropriate than u_long for these.
- Remove the unused LE_DRIVER_NAME macro.
- Add a comment describing why we are taking the LE_HTOLE* etc approach
  instead of using byteorder(9) functions directly.
- Improve some comments and fix some wording.

MFC after:	2 weeks
2006-05-16 21:04:01 +00:00

215 lines
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/* $NetBSD: lancevar.h,v 1.10 2005/12/11 12:21:27 christos Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace
* Simulation Facility, NASA Ames Research Center.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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.
*/
/* $FreeBSD$ */
#ifndef _DEV_LE_LANCEVAR_H_
#define _DEV_LE_LANCEVAR_H_
extern devclass_t le_devclass;
struct lance_softc {
struct ifnet *sc_ifp;
struct ifmedia sc_media;
struct mtx sc_mtx;
/*
* Memory functions:
*
* copy to/from descriptor
* copy to/from buffer
* zero bytes in buffer
*/
void (*sc_copytodesc)(struct lance_softc *, void *, int, int);
void (*sc_copyfromdesc)(struct lance_softc *, void *, int, int);
void (*sc_copytobuf)(struct lance_softc *, void *, int, int);
void (*sc_copyfrombuf)(struct lance_softc *, void *, int, int);
void (*sc_zerobuf)(struct lance_softc *, int, int);
/*
* Machine-dependent functions:
*
* read/write CSR
* hardware reset hook - may be NULL
* hardware init hook - may be NULL
* no carrier hook - may be NULL
* media change hook - may be NULL
*/
uint16_t (*sc_rdcsr)(struct lance_softc *, uint16_t);
void (*sc_wrcsr)(struct lance_softc *, uint16_t, uint16_t);
void (*sc_hwreset)(struct lance_softc *);
void (*sc_hwinit)(struct lance_softc *);
int (*sc_hwintr)(struct lance_softc *);
void (*sc_nocarrier)(struct lance_softc *);
int (*sc_mediachange)(struct lance_softc *);
void (*sc_mediastatus)(struct lance_softc *, struct ifmediareq *);
/*
* Media-supported by this interface. If this is NULL,
* the only supported media is assumed to be "manual".
*/
const int *sc_supmedia;
int sc_nsupmedia;
int sc_defaultmedia;
uint16_t sc_conf3; /* CSR3 value */
void *sc_mem; /* base address of RAM - CPU's view */
bus_addr_t sc_addr; /* base address of RAM - LANCE's view */
bus_size_t sc_memsize; /* size of RAM */
int sc_nrbuf; /* number of receive buffers */
int sc_ntbuf; /* number of transmit buffers */
int sc_last_rd;
int sc_first_td;
int sc_last_td;
int sc_no_td;
int sc_initaddr;
int sc_rmdaddr;
int sc_tmdaddr;
int sc_rbufaddr;
int sc_tbufaddr;
uint8_t sc_enaddr[ETHER_ADDR_LEN];
void (*sc_meminit)(struct lance_softc *);
void (*sc_start_locked)(struct lance_softc *);
int sc_flags;
#define LE_ALLMULTI (1 << 0)
#define LE_BSWAP (1 << 1)
#define LE_CARRIER (1 << 2)
#define LE_DEBUG (1 << 3)
#define LE_PROMISC (1 << 4)
};
#define LE_LOCK_INIT(_sc, _name) \
mtx_init(&(_sc)->sc_mtx, _name, MTX_NETWORK_LOCK, MTX_DEF)
#define LE_LOCK_INITIALIZED(_sc) mtx_initialized(&(_sc)->sc_mtx)
#define LE_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define LE_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define LE_LOCK_ASSERT(_sc, _what) mtx_assert(&(_sc)->sc_mtx, (_what))
#define LE_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx)
/*
* Unfortunately, manual byte swapping is only necessary for the PCnet-PCI
* variants but not for the original LANCE or ILACC so we cannot do this
* with #ifdefs resolved at compile time.
*/
#define LE_HTOLE16(v) (((sc)->sc_flags & LE_BSWAP) ? htole16(v) : (v))
#define LE_HTOLE32(v) (((sc)->sc_flags & LE_BSWAP) ? htole32(v) : (v))
#define LE_LE16TOH(v) (((sc)->sc_flags & LE_BSWAP) ? le16toh(v) : (v))
#define LE_LE32TOH(v) (((sc)->sc_flags & LE_BSWAP) ? le32toh(v) : (v))
int lance_config(struct lance_softc *, const char*, int);
void lance_attach(struct lance_softc *);
void lance_detach(struct lance_softc *);
void lance_suspend(struct lance_softc *);
void lance_resume(struct lance_softc *);
void lance_init_locked(struct lance_softc *);
int lance_put(struct lance_softc *, int, struct mbuf *);
struct mbuf *lance_get(struct lance_softc *, int, int);
void lance_setladrf(struct lance_softc *, u_int16_t *);
/*
* The following functions are only useful on certain CPU/bus
* combinations. They should be written in assembly language for
* maximum efficiency, but machine-independent versions are provided
* for drivers that have not yet been optimized.
*/
void lance_copytobuf_contig(struct lance_softc *, void *, int, int);
void lance_copyfrombuf_contig(struct lance_softc *, void *, int, int);
void lance_zerobuf_contig(struct lance_softc *, int, int);
#if 0 /* Example only - see lance.c */
void lance_copytobuf_gap2(struct lance_softc *, void *, int, int);
void lance_copyfrombuf_gap2(struct lance_softc *, void *, int, int);
void lance_zerobuf_gap2(struct lance_softc *, int, int);
void lance_copytobuf_gap16(struct lance_softc *, void *, int, int);
void lance_copyfrombuf_gap16(struct lance_softc *, void *, int, int);
void lance_zerobuf_gap16(struct lance_softc *, int, int);
#endif /* Example only */
/*
* Compare two Ether/802 addresses for equality, inlined and
* unrolled for speed. Use this like memcmp().
*
* XXX: Add <machine/inlines.h> for stuff like this?
* XXX: or maybe add it to libkern.h instead?
*
* "I'd love to have an inline assembler version of this."
* XXX: Who wanted that? mycroft? I wrote one, but this
* version in C is as good as hand-coded assembly. -gwr
*
* Please do NOT tweak this without looking at the actual
* assembly code generated before and after your tweaks!
*/
static inline uint16_t
ether_cmp(void *one, void *two)
{
uint16_t *a = (u_short *)one;
uint16_t *b = (u_short *)two;
uint16_t diff;
#ifdef m68k
/*
* The post-increment-pointer form produces the best
* machine code for m68k. This was carefully tuned
* so it compiles to just 8 short (2-byte) op-codes!
*/
diff = *a++ - *b++;
diff |= *a++ - *b++;
diff |= *a++ - *b++;
#else
/*
* Most modern CPUs do better with a single expresion.
* Note that short-cut evaluation is NOT helpful here,
* because it just makes the code longer, not faster!
*/
diff = (a[0] - b[0]) | (a[1] - b[1]) | (a[2] - b[2]);
#endif
return (diff);
}
#endif /* _DEV_LE_LANCEVAR_H_ */
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