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freebsd-dev/sys/dev/mii/miivar.h
Marcel Moolenaar 62d76917b8 Introduce a procedural interface to the ifnet structure. The new 
interface allows the ifnet structure to be defined as an opaque
type in NIC drivers.  This then allows the ifnet structure to be
changed without a need to change or recompile NIC drivers.

Put differently, NIC drivers can be written and compiled once and
be used with different network stack implementations, provided of
course that those network stack implementations have an API and
ABI compatible interface.

This commit introduces the 'if_t' type to replace 'struct ifnet *'
as the type of a network interface. The 'if_t' type is defined as
'void *' to enable the compiler to perform type conversion to
'struct ifnet *' and vice versa where needed and without warnings.
The functions that implement the API are the only functions that
need to have an explicit cast.

The MII code has been converted to use the driver API to avoid
unnecessary code churn. Code churn comes from having to work with
both converted and unconverted drivers in correlation with having
callback functions that take an interface. By converting the MII
code first, the callback functions can be defined so that the
compiler will perform the typecasts automatically.

As soon as all drivers have been converted, the if_t type can be
redefined as needed and the API functions can be fix to not need
an explicit cast.

The immediate benefactors of this change are:
1.  Juniper Networks - The network stack implementation in Junos
    is entirely different from FreeBSD's one and this change
    allows Juniper to build "stock" NIC drivers that can be used
    in combination with both the FreeBSD and Junos stacks.
2.  FreeBSD - This change opens the door towards changing ifnet
    and implementing new features and optimizations in the network
    stack without it requiring a change in the many NIC drivers
    FreeBSD has.

Submitted by:	Anuranjan Shukla <anshukla@juniper.net>
Reviewed by:	glebius@
Obtained from:	Juniper Networks, Inc.
2014-06-02 17:54:39 +00:00

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/* $NetBSD: miivar.h,v 1.8 1999/04/23 04:24:32 thorpej Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* 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.
*
* 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_MII_MIIVAR_H_
#define _DEV_MII_MIIVAR_H_
#include <sys/queue.h>
#include <net/if_var.h> /* XXX driver API temporary */
/*
* Media Independent Interface data structure defintions
*/
struct mii_softc;
/*
* Callbacks from MII layer into network interface device driver.
*/
typedef int (*mii_readreg_t)(struct device *, int, int);
typedef void (*mii_writereg_t)(struct device *, int, int, int);
typedef void (*mii_statchg_t)(struct device *);
/*
* A network interface driver has one of these structures in its softc.
* It is the interface from the network interface driver to the MII
* layer.
*/
struct mii_data {
struct ifmedia mii_media; /* media information */
if_t mii_ifp; /* pointer back to network interface */
/*
* For network interfaces with multiple PHYs, a list of all
* PHYs is required so they can all be notified when a media
* request is made.
*/
LIST_HEAD(mii_listhead, mii_softc) mii_phys;
u_int mii_instance;
/*
* PHY driver fills this in with active media status.
*/
u_int mii_media_status;
u_int mii_media_active;
/*
* Calls from MII layer into network interface driver.
*/
mii_readreg_t mii_readreg;
mii_writereg_t mii_writereg;
mii_statchg_t mii_statchg;
};
typedef struct mii_data mii_data_t;
/*
* Functions provided by the PHY to perform various functions.
*/
struct mii_phy_funcs {
int (*pf_service)(struct mii_softc *, struct mii_data *, int);
void (*pf_status)(struct mii_softc *);
void (*pf_reset)(struct mii_softc *);
};
/*
* Requests that can be made to the downcall.
*/
#define MII_TICK 1 /* once-per-second tick */
#define MII_MEDIACHG 2 /* user changed media; perform the switch */
#define MII_POLLSTAT 3 /* user requested media status; fill it in */
/*
* Each PHY driver's softc has one of these as the first member.
* XXX This would be better named "phy_softc", but this is the name
* XXX BSDI used, and we would like to have the same interface.
*/
struct mii_softc {
device_t mii_dev; /* generic device glue */
LIST_ENTRY(mii_softc) mii_list; /* entry on parent's PHY list */
uint32_t mii_mpd_oui; /* the PHY's OUI (MII_OUI())*/
uint32_t mii_mpd_model; /* the PHY's model (MII_MODEL())*/
uint32_t mii_mpd_rev; /* the PHY's revision (MII_REV())*/
u_int mii_capmask; /* capability mask for BMSR */
u_int mii_phy; /* our MII address */
u_int mii_offset; /* first PHY, second PHY, etc. */
u_int mii_inst; /* instance for ifmedia */
/* Our PHY functions. */
const struct mii_phy_funcs *mii_funcs;
struct mii_data *mii_pdata; /* pointer to parent's mii_data */
u_int mii_flags; /* misc. flags; see below */
u_int mii_capabilities; /* capabilities from BMSR */
u_int mii_extcapabilities; /* extended capabilities */
u_int mii_ticks; /* MII_TICK counter */
u_int mii_anegticks; /* ticks before retrying aneg */
u_int mii_media_active; /* last active media */
u_int mii_media_status; /* last active status */
};
typedef struct mii_softc mii_softc_t;
/* mii_flags */
#define MIIF_INITDONE 0x00000001 /* has been initialized (mii_data) */
#define MIIF_NOISOLATE 0x00000002 /* do not isolate the PHY */
#if 0
#define MIIF_NOLOOP 0x00000004 /* no loopback capability */
#endif
#define MIIF_DOINGAUTO 0x00000008 /* doing autonegotiation (mii_softc) */
#define MIIF_AUTOTSLEEP 0x00000010 /* use tsleep(), not callout() */
#define MIIF_HAVEFIBER 0x00000020 /* from parent: has fiber interface */
#define MIIF_HAVE_GTCR 0x00000040 /* has 100base-T2/1000base-T CR */
#define MIIF_IS_1000X 0x00000080 /* is a 1000BASE-X device */
#define MIIF_DOPAUSE 0x00000100 /* advertise PAUSE capability */
#define MIIF_IS_HPNA 0x00000200 /* is a HomePNA device */
#define MIIF_FORCEANEG 0x00000400 /* force auto-negotiation */
#define MIIF_NOMANPAUSE 0x00100000 /* no manual PAUSE selection */
#define MIIF_FORCEPAUSE 0x00200000 /* force PAUSE advertisement */
#define MIIF_MACPRIV0 0x01000000 /* private to the MAC driver */
#define MIIF_MACPRIV1 0x02000000 /* private to the MAC driver */
#define MIIF_MACPRIV2 0x04000000 /* private to the MAC driver */
#define MIIF_PHYPRIV0 0x10000000 /* private to the PHY driver */
#define MIIF_PHYPRIV1 0x20000000 /* private to the PHY driver */
#define MIIF_PHYPRIV2 0x40000000 /* private to the PHY driver */
/* Default mii_anegticks values */
#define MII_ANEGTICKS 5
#define MII_ANEGTICKS_GIGE 17
#define MIIF_INHERIT_MASK (MIIF_NOISOLATE|MIIF_NOLOOP|MIIF_AUTOTSLEEP)
/*
* Special `locators' passed to mii_attach(). If one of these is not
* an `any' value, we look for *that* PHY and configure it. If both
* are not `any', that is an error, and mii_attach() will fail.
*/
#define MII_OFFSET_ANY -1
#define MII_PHY_ANY -1
/*
* Used to attach a PHY to a parent.
*/
struct mii_attach_args {
struct mii_data *mii_data; /* pointer to parent data */
u_int mii_phyno; /* MII address */
u_int mii_offset; /* first PHY, second PHY, etc. */
uint32_t mii_id1; /* PHY ID register 1 */
uint32_t mii_id2; /* PHY ID register 2 */
u_int mii_capmask; /* capability mask for BMSR */
};
typedef struct mii_attach_args mii_attach_args_t;
/*
* Used to match a PHY.
*/
struct mii_phydesc {
uint32_t mpd_oui; /* the PHY's OUI */
uint32_t mpd_model; /* the PHY's model */
const char *mpd_name; /* the PHY's name */
};
#define MII_PHY_DESC(a, b) { MII_OUI_ ## a, MII_MODEL_ ## a ## _ ## b, \
MII_STR_ ## a ## _ ## b }
#define MII_PHY_END { 0, 0, NULL }
/*
* An array of these structures map MII media types to BMCR/ANAR settings.
*/
struct mii_media {
u_int mm_bmcr; /* BMCR settings for this media */
u_int mm_anar; /* ANAR settings for this media */
u_int mm_gtcr; /* 100base-T2 or 1000base-T CR */
};
#define MII_MEDIA_NONE 0
#define MII_MEDIA_10_T 1
#define MII_MEDIA_10_T_FDX 2
#define MII_MEDIA_100_T4 3
#define MII_MEDIA_100_TX 4
#define MII_MEDIA_100_TX_FDX 5
#define MII_MEDIA_1000_X 6
#define MII_MEDIA_1000_X_FDX 7
#define MII_MEDIA_1000_T 8
#define MII_MEDIA_1000_T_FDX 9
#define MII_NMEDIA 10
#ifdef _KERNEL
#define PHY_READ(p, r) \
MIIBUS_READREG((p)->mii_dev, (p)->mii_phy, (r))
#define PHY_WRITE(p, r, v) \
MIIBUS_WRITEREG((p)->mii_dev, (p)->mii_phy, (r), (v))
#define PHY_SERVICE(p, d, o) \
(*(p)->mii_funcs->pf_service)((p), (d), (o))
#define PHY_STATUS(p) \
(*(p)->mii_funcs->pf_status)(p)
#define PHY_RESET(p) \
(*(p)->mii_funcs->pf_reset)(p)
enum miibus_device_ivars {
MIIBUS_IVAR_FLAGS
};
/*
* Simplified accessors for miibus
*/
#define MIIBUS_ACCESSOR(var, ivar, type) \
__BUS_ACCESSOR(miibus, var, MIIBUS, ivar, type)
MIIBUS_ACCESSOR(flags, FLAGS, u_int)
extern devclass_t miibus_devclass;
extern driver_t miibus_driver;
int mii_attach(device_t, device_t *, if_t, ifm_change_cb_t,
ifm_stat_cb_t, int, int, int, int);
void mii_down(struct mii_data *);
int mii_mediachg(struct mii_data *);
void mii_tick(struct mii_data *);
void mii_pollstat(struct mii_data *);
void mii_phy_add_media(struct mii_softc *);
int mii_phy_auto(struct mii_softc *);
int mii_phy_detach(device_t dev);
void mii_phy_down(struct mii_softc *);
u_int mii_phy_flowstatus(struct mii_softc *);
void mii_phy_reset(struct mii_softc *);
void mii_phy_setmedia(struct mii_softc *sc);
void mii_phy_update(struct mii_softc *, int);
int mii_phy_tick(struct mii_softc *);
const struct mii_phydesc * mii_phy_match(const struct mii_attach_args *ma,
const struct mii_phydesc *mpd);
const struct mii_phydesc * mii_phy_match_gen(const struct mii_attach_args *ma,
const struct mii_phydesc *mpd, size_t endlen);
int mii_phy_dev_probe(device_t dev, const struct mii_phydesc *mpd, int mrv);
void mii_phy_dev_attach(device_t dev, u_int flags,
const struct mii_phy_funcs *mpf, int add_media);
void ukphy_status(struct mii_softc *);
u_int mii_oui(u_int, u_int);
#define MII_OUI(id1, id2) mii_oui(id1, id2)
#define MII_MODEL(id2) (((id2) & IDR2_MODEL) >> 4)
#define MII_REV(id2) ((id2) & IDR2_REV)
#endif /* _KERNEL */
#endif /* _DEV_MII_MIIVAR_H_ */
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