freebsd-dev/sys/dev/fxp/if_fxpvar.h
Luigi Rizzo e4fc250c15 Device Polling code for -current.
Non-SMP, i386-only, no polling in the idle loop at the moment.

To use this code you must compile a kernel with

        options DEVICE_POLLING

and at runtime enable polling with

        sysctl kern.polling.enable=1

The percentage of CPU reserved to userland can be set with

        sysctl kern.polling.user_frac=NN (default is 50)

while the remainder is used by polling device drivers and netisr's.
These are the only two variables that you should need to touch. There
are a few more parameters in kern.polling but the default values
are adequate for all purposes. See the code in kern_poll.c for
more details on them.

Polling in the idle loop will be implemented shortly by introducing
a kernel thread which does the job. Until then, the amount of CPU
dedicated to polling will never exceed (100-user_frac).
The equivalent (actually, better) code for -stable is at

	http://info.iet.unipi.it/~luigi/polling/

and also supports polling in the idle loop.

NOTE to Alpha developers:
There is really nothing in this code that is i386-specific.
If you move the 2 lines supporting the new option from
sys/conf/{files,options}.i386 to sys/conf/{files,options} I am
pretty sure that this should work on the Alpha as well, just that
I do not have a suitable test box to try it. If someone feels like
trying it, I would appreciate it.

NOTE to other developers:
sure some things could be done better, and as always I am open to
constructive criticism, which a few of you have already given and
I greatly appreciated.
However, before proposing radical architectural changes, please
take some time to possibly try out this code, or at the very least
read the comments in kern_poll.c, especially re. the reason why I
am using a soft netisr and cannot (I believe) replace it with a
simple timeout.

Quick description of files touched by this commit:

sys/conf/files.i386
        new file kern/kern_poll.c
sys/conf/options.i386
        new option
sys/i386/i386/trap.c
        poll in trap (disabled by default)
sys/kern/kern_clock.c
        initialization and hardclock hooks.
sys/kern/kern_intr.c
        minor swi_net changes
sys/kern/kern_poll.c
        the bulk of the code.
sys/net/if.h
        new flag
sys/net/if_var.h
        declaration for functions used in device drivers.
sys/net/netisr.h
        NETISR_POLL
sys/dev/fxp/if_fxp.c
sys/dev/fxp/if_fxpvar.h
sys/pci/if_dc.c
sys/pci/if_dcreg.h
sys/pci/if_sis.c
sys/pci/if_sisreg.h
        device driver modifications
2001-12-14 17:56:12 +00:00

178 lines
6.6 KiB
C

/*
* 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)
#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 */
/* 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