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freebsd-nq/sys/pci/if_wxvar.h
Matt Jacob 819e7ffdf3 Whack on this soon to be deprecated driver. 
What the heck, the OpenBSD version will benefit.

1. Add wx_txint_delay as a tunable (defaults to 5000 now, or ~5ms) and switch
to using delayed TXDW interrupts. Since the chip continues to reload the
TIDV with this value for each descriptor written back, this allows continued
deferral of the actual interrupt until the last packet completes (assuming
that 5ms between multiple packets transmitting is reasonable).

2. Add two other SYSCTL entities:

hw.wx.dump_stats
hw.wx.clear_stats

to be used, hackey hackey, to get the watchdog routine to dump/clear
the current softc statistics.

Usage would be:

	sysctl -w hw.wx.dump_stats=UNIT

to cause the current stats to be dumped for UNIT.

3. Attempt to clean up wx_detach routine so we don't panic. Well, things
still panic, but given that the code is just like other NIC drivers,
I suspect it's actually something elsewhere, like e1000phy, that's actually
blowing up.

4. Skip the entire test for runt packets- after doing somet thinking
and experimenting, I believe that the chip only doesn't like it if
the whole frame to xmit is < 16 bytes- each TFD can be some fragment
of that. This should improve performance a chunk because of all of the
(14 byte ETHERHEADER + DATA) mbuf chains.

5. Keep track of total frame length. Try not to xmit an odd byte frame-
this is supposed to get around some dumb Cisco switch problems.

6. On the last packet, also set Interrupt Delay && Report Packet Sent
(see #1 above)

7. Attempt to do xmit garbage collection *first* in order to avoid setting
IFF_OACTIVE if at all possible.

MFC after:	1 week
2001-10-15 06:59:41 +00:00

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/* $FreeBSD$ */
/*
* Principal Author: Matthew Jacob
* Copyright (c) 1999, 2001 by Traakan Software
* 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.
*
* Additional Copyright (c) 2001 by Parag Patel
* under same licence for MII PHY code.
*/
/*
* Softc definitions for the Intel Gigabit Ethernet driver.
*
* Guidance and inspiration from David Greenman's
* if_fxp driver gratefully acknowledged here.
*/
/*
* Platform specific defines and inline functions go here.
* Look further below for more generic structures.
*/
/*
* Enable for FreeBSD 5.0 SMP code
*/
#define SMPNG 1
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#include <net/bpf.h>
#include <sys/sockio.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <net/ethernet.h>
#include <net/if_arp.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/clock.h>
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include <pci/if_wxreg.h>
#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <sys/sysctl.h>
#define NBPFILTER 1
MODULE_DEPEND(wx, miibus, 1, 1, 1);
#include "miibus_if.h"
#include "opt_bdg.h"
#ifdef BRIDGE
#include <net/if_types.h>
#include <net/bridge.h>
#endif
struct wxmdvar {
/*
* arpcom must be first
*/
struct arpcom arpcom; /* per-interface network data */
struct device * dev; /* backpointer to device */
struct resource * mem; /* resource descriptor for registers */
struct resource * irq; /* resource descriptor for interrupt */
void * ih; /* interrupt handler cookie */
u_int16_t cmdw;
struct callout_handle sch; /* handle for timeouts */
char name[8];
bus_space_tag_t st; /* bus space tag */
bus_space_handle_t sh; /* bus space handle */
struct ifmedia ifm;
device_t miibus;
struct wx_softc * next;
#ifdef SMPNG
struct mtx wxmtx;
#else
int spl;
#endif
};
#define wx_dev w.dev
#define wx_enaddr w.arpcom.ac_enaddr
#define wx_cmdw w.cmdw
#define wx_media w.ifm
#define wx_next w.next
#define wx_if w.arpcom.ac_if
#define wx_name w.name
#define wx_mtx w.wxmtx
#define IOCTL_CMD_TYPE u_long
#define WXMALLOC(len) malloc(len, M_DEVBUF, M_NOWAIT)
#define WXFREE(ptr) free(ptr, M_DEVBUF)
#define SOFTC_IFP(ifp) ifp->if_softc
#define WX_BPFTAP_ARG(ifp) ifp
#define VTIMEOUT(sc, func, arg, time) (void) timeout(func, arg, time)
#define TIMEOUT(sc, func, arg, time) (sc)->w.sch = timeout(func, arg, time)
#define UNTIMEOUT(f, arg, sc) untimeout(f, arg, (sc)->w.sch)
#define INLINE __inline
#ifdef SMPNG
#define WX_LOCK(_sc) mtx_lock(&(_sc)->wx_mtx)
#define WX_UNLOCK(_sc) mtx_unlock(&(_sc)->wx_mtx)
#define WX_ILOCK(_sc) mtx_lock(&(_sc)->wx_mtx)
#define WX_IUNLK(_sc) mtx_unlock(&(_sc)->wx_mtx)
#else
#define WX_LOCK(_sc) _sc->w.spl = splimp()
#define WX_UNLOCK(_sc) splx(_sc->w.spl)
#define WX_ILOCK(_sc)
#define WX_IUNLK(_sc)
#endif
#define WX_SOFTC_FROM_MII_ARG(x) device_get_softc(x)
#define WX_MII_FROM_SOFTC(x) device_get_softc((x)->w.miibus)
#define READ_CSR(sc, reg) \
bus_space_read_4((sc)->w.st, (sc)->w.sh, (reg))
#define WRITE_CSR(sc, reg, val) \
bus_space_write_4((sc)->w.st, (sc)->w.sh, (reg), (val))
/*
* Transmit soft descriptor, used to manage packets as they come in.
*/
typedef struct rxpkt {
struct mbuf *dptr; /* pointer to receive frame */
u_int32_t dma_addr; /* dma address */
} rxpkt_t;
/*
* Transmit soft descriptor, used to manage packets as they are transmitted.
*/
typedef struct txpkt {
struct txpkt *next; /* next in a chain */
struct mbuf *dptr; /* pointer to mbuf being sent */
u_int32_t sidx; /* start index */
u_int32_t eidx; /* end index */
} txpkt_t;
typedef struct wx_softc {
/*
* OS dependent storage... must be first...
*/
struct wxmdvar w;
/*
* misc goodies
*/
u_int32_t : 22,
wx_needreinit : 1,
wx_mii : 1, /* non-zero if we have a PHY */
wx_no_flow : 1,
wx_ilos : 1,
wx_no_ilos : 1,
wx_verbose : 1,
wx_debug : 1,
ane_failed : 1,
linkup : 1,
all_mcasts : 1;
u_int32_t wx_idnrev; /* chip revision && PCI ID */
u_int16_t wx_cfg1;
u_int16_t wx_unused;
u_int32_t wx_ienable; /* current ienable to use */
u_int32_t wx_dcr; /* dcr used */
u_int32_t wx_icr; /* last icr */
/*
* Statistics, soft && hard
*/
u_int32_t wx_intr;
u_int32_t wx_linkintr;
u_int32_t wx_rxintr;
u_int32_t wx_txqe;
u_int32_t wx_xmitgc;
u_int32_t wx_xmitpullup;
u_int32_t wx_xmitcluster;
u_int32_t wx_xmitputback;
u_int32_t wx_xmitwanted;
u_int32_t wx_xmitblocked;
u_int32_t wx_xmitrunt;
u_int32_t wx_rxnobuf;
u_int32_t wx_oddpkt;
/*
* Soft copies of multicast addresses. We're only
* using (right now) the rest of the receive address
* registers- not the hashed multicast table.
*/
u_int8_t wx_mcaddr[WX_RAL_TAB_SIZE-1][6];
u_int8_t wx_nmca; /* # active multicast addrs */
/*
* Receive Management
* We have software and shared memory rings in a buddy store format.
*/
wxrd_t *rdescriptors; /* receive descriptor ring */
rxpkt_t *rbase; /* base of soft rdesc list */
u_int16_t rnxt; /* next descriptor to check */
u_int16_t _pad;
struct mbuf *rpending; /* pending partial packet */
/*
* Transmit Management
* We have software and shared memory rings in a buddy store format.
*/
txpkt_t *tbase; /* base of soft soft management */
txpkt_t *tbsyf, *tbsyl; /* linked busy list */
wxtd_t *tdescriptors; /* transmit descriptor ring */
u_int16_t tnxtfree; /* next free index (circular) */
u_int16_t tactive; /* # active */
} wx_softc_t;
/*
* We offset the the receive frame header by two bytes so that the actual
* payload is 32 bit aligned. On platforms that require strict structure
* alignment, this means that the ethernet frame header may have to be shifted
* to align it at interrupt time, but because it's such a small amount
* (fourteen bytes) and processors have gotten pretty fast, that's okay.
* It may even turn out on some platforms that this doesn't have to happen.
*/
#define WX_RX_OFFSET_VALUE 2
/*
* Tunable Parameters.
*
* Descriptor lengths must be in multiples of 8.
*/
#define WX_MAX_TDESC 256 /* number of transmit descriptors */
#define T_NXT_IDX(x) ((x + 1) & (WX_MAX_TDESC - 1))
#define T_PREV_IDX(x) ((x - 1) & (WX_MAX_TDESC - 1))
#define WX_MAX_RDESC 256 /* number of receive descriptors */
#ifdef PADDED_CELL
#define RXINCR 2
#else
#define RXINCR 1
#endif
#define R_NXT_IDX(x) ((x + RXINCR) & (WX_MAX_RDESC - 1))
#define R_PREV_IDX(x) ((x - RXINCR) & (WX_MAX_RDESC - 1))
/*
* Link Up timeout, in milliseconds.
*/
#define WX_LINK_UP_TIMEOUT 500
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