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freebsd-nq/sys/dev/fxp/if_fxpvar.h
Ian Dowse 947e381597 Properly fix the occassional random crash issue that revision 1.142 
just limited to the DEVICE_POLLING case. This removes the FXP_RFA_RNRMARK
hack, and replaces it with a softc flag that is used to record when
the handling of a no-resource condition was deferred due to running
out of DEVICE_POLLING cycles. This was tested on -stable, but the
code is essentially the same as in -current. It should only affect
the case where DEVICE_POLLING is defined.

The details of the mechanism behind the crashes are still uncertain
but the most likely cause seems to be some kind of hardware confusion
when the no-resource recovery code is accidentally invoked while
the receiver is still active. This could have happened if the
hardware left the 0x4000 bit of the RFA status word set. The comments
in the commit log for revision 1.142 stating that the driver could
clash with the hardware writing to this status word were not correct.

Tested by:	Guy Helmer <ghelmer@palisadesys.com>
2002-11-07 16:04:07 +00:00

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/*
* Copyright (c) 1995, David Greenman
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
/*
* Misc. defintions for the Intel EtherExpress Pro/100B PCI Fast
* Ethernet driver
*/
/*
* Number of transmit control blocks. This determines the number
* of transmit buffers that can be chained in the CB list.
* This must be a power of two.
*/
#define FXP_NTXCB 128
/*
* Number of completed TX commands at which point an interrupt
* will be generated to garbage collect the attached buffers.
* Must be at least one less than FXP_NTXCB, and should be
* enough less so that the transmitter doesn't becomes idle
* during the buffer rundown (which would reduce performance).
*/
#define FXP_CXINT_THRESH 120
/*
* TxCB list index mask. This is used to do list wrap-around.
*/
#define FXP_TXCB_MASK (FXP_NTXCB - 1)
/*
* Number of receive frame area buffers. These are large so chose
* wisely.
*/
#ifdef DEVICE_POLLING
#define FXP_NRFABUFS 192
#else
#define FXP_NRFABUFS 64
#endif
/*
* Maximum number of seconds that the receiver can be idle before we
* assume it's dead and attempt to reset it by reprogramming the
* multicast filter. This is part of a work-around for a bug in the
* NIC. See fxp_stats_update().
*/
#define FXP_MAX_RX_IDLE 15
/*
* Default maximum time, in microseconds, that an interrupt may be delayed
* in an attempt to coalesce interrupts. This is only effective if the Intel
* microcode is loaded, and may be changed via either loader tunables or
* sysctl. See also the CPUSAVER_DWORD entry in rcvbundl.h.
*/
#define TUNABLE_INT_DELAY 1000
/*
* Default number of packets that will be bundled, before an interrupt is
* generated. This is only effective if the Intel microcode is loaded, and
* may be changed via either loader tunables or sysctl. This may not be
* present in all microcode revisions, see also the CPUSAVER_BUNDLE_MAX_DWORD
* entry in rcvbundl.h.
*/
#define TUNABLE_BUNDLE_MAX 6
#if __FreeBSD_version < 500000
#define FXP_LOCK(_sc)
#define FXP_UNLOCK(_sc)
#define mtx_init(a, b, c, d)
#define mtx_destroy(a)
struct mtx { int dummy; };
#else
#define FXP_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define FXP_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#endif
#ifdef __alpha__
#undef vtophys
#define vtophys(va) alpha_XXX_dmamap((vm_offset_t)(va))
#endif /* __alpha__ */
/*
* NOTE: Elements are ordered for optimal cacheline behavior, and NOT
* for functional grouping.
*/
struct fxp_softc {
struct arpcom arpcom; /* per-interface network data */
struct resource *mem; /* resource descriptor for registers */
int rtp; /* register resource type */
int rgd; /* register descriptor in use */
struct resource *irq; /* resource descriptor for interrupt */
void *ih; /* interrupt handler cookie */
struct mtx sc_mtx;
bus_space_tag_t sc_st; /* bus space tag */
bus_space_handle_t sc_sh; /* bus space handle */
struct mbuf *rfa_headm; /* first mbuf in receive frame area */
struct mbuf *rfa_tailm; /* last mbuf in receive frame area */
struct fxp_cb_tx *cbl_first; /* first active TxCB in list */
int tx_queued; /* # of active TxCB's */
int need_mcsetup; /* multicast filter needs programming */
struct fxp_cb_tx *cbl_last; /* last active TxCB in list */
struct fxp_stats *fxp_stats; /* Pointer to interface stats */
int rx_idle_secs; /* # of seconds RX has been idle */
struct callout_handle stat_ch; /* Handle for canceling our stat timeout */
struct fxp_cb_tx *cbl_base; /* base of TxCB list */
struct fxp_cb_mcs *mcsp; /* Pointer to mcast setup descriptor */
struct ifmedia sc_media; /* media information */
device_t miibus;
device_t dev;
struct sysctl_ctx_list sysctl_ctx;
struct sysctl_oid *sysctl_tree;
int tunable_int_delay; /* interrupt delay value for ucode */
int tunable_bundle_max; /* max # frames per interrupt (ucode) */
int eeprom_size; /* size of serial EEPROM */
int suspended; /* 0 = normal 1 = suspended (APM) */
int cu_resume_bug;
int revision;
int flags;
u_int32_t saved_maps[5]; /* pci data */
u_int32_t saved_biosaddr;
u_int8_t saved_intline;
u_int8_t saved_cachelnsz;
u_int8_t saved_lattimer;
};
#define FXP_FLAG_MWI_ENABLE 0x0001 /* MWI enable */
#define FXP_FLAG_READ_ALIGN 0x0002 /* align read access with cacheline */
#define FXP_FLAG_WRITE_ALIGN 0x0004 /* end write on cacheline */
#define FXP_FLAG_EXT_TXCB 0x0008 /* enable use of extended TXCB */
#define FXP_FLAG_SERIAL_MEDIA 0x0010 /* 10Mbps serial interface */
#define FXP_FLAG_LONG_PKT_EN 0x0020 /* enable long packet reception */
#define FXP_FLAG_ALL_MCAST 0x0040 /* accept all multicast frames */
#define FXP_FLAG_CU_RESUME_BUG 0x0080 /* requires workaround for CU_RESUME */
#define FXP_FLAG_UCODE 0x0100 /* ucode is loaded */
#define FXP_FLAG_DEFERRED_RNR 0x0200 /* DEVICE_POLLING deferred RNR */
/* Macros to ease CSR access. */
#define CSR_READ_1(sc, reg) \
bus_space_read_1((sc)->sc_st, (sc)->sc_sh, (reg))
#define CSR_READ_2(sc, reg) \
bus_space_read_2((sc)->sc_st, (sc)->sc_sh, (reg))
#define CSR_READ_4(sc, reg) \
bus_space_read_4((sc)->sc_st, (sc)->sc_sh, (reg))
#define CSR_WRITE_1(sc, reg, val) \
bus_space_write_1((sc)->sc_st, (sc)->sc_sh, (reg), (val))
#define CSR_WRITE_2(sc, reg, val) \
bus_space_write_2((sc)->sc_st, (sc)->sc_sh, (reg), (val))
#define CSR_WRITE_4(sc, reg, val) \
bus_space_write_4((sc)->sc_st, (sc)->sc_sh, (reg), (val))
#define sc_if arpcom.ac_if
#define FXP_UNIT(_sc) (_sc)->arpcom.ac_if.if_unit
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