GLD_MAC_INFO(9S) Data Structures for Drivers GLD_MAC_INFO(9S)


NAME


gld_mac_info - Generic LAN Driver MAC info data structure

SYNOPSIS


#include <sys/gld.h>


INTERFACE LEVEL


Solaris architecture specific (Solaris DDI).

DESCRIPTION


The Generic LAN Driver (GLD) Media Access Control (MAC) information
(gld_mac_info) structure is the main data interface between the device-
specific driver and GLD. It contains data required by GLD and a pointer
to an optional additional driver-specific information structure.


The gld_mac_info structure should be allocated using gld_mac_alloc() and
deallocated using gld_mac_free(). Drivers can make no assumptions about
the length of this structure, which might be different in different
releases of Solaris and/or GLD. Structure members private to GLD, not
documented here, should not be set or read by the device-specific driver.

STRUCTURE MEMBERS


caddr_t gldm_private; /* Driver private data */
int (*gldm_reset)(); /* Reset device */
int (*gldm_start)(); /* Start device */
int (*gldm_stop)(); /* Stop device */
int (*gldm_set_mac_addr)(); /* Set device phys addr */
int (*gldm_set_multicast)(); /* Set/delete */
/* multicast address */
int (*gldm_set_promiscuous)();
/* Set/reset promiscuous */
/* mode*/
int (*gldm_send)(); /* Transmit routine */
u_int (*gldm_intr)(); /* Interrupt handler */
int (*gldm_get_stats)(); /* Get device statistics */
int (*gldm_ioctl)(); /* Driver-specific ioctls */
char *gldm_ident; /* Driver identity string */
uint32_t gldm_type; /* Device type */
uint32_t gldm_minpkt; /* Minimum packet size */
/* accepted by driver */
uint32_t gldm_maxpkt; /* Maximum packet size */
/* accepted by driver */
uint32_t gldm_addrlen; /* Physical address */
/* length */
int32_t gldm_saplen; /* SAP length for */
/* DL_INFO_ACK */
unsigned char *gldm_broadcast_addr; /* Physical broadcast */
/* addr */
unsigned char *gldm_vendor_addr; /* Factory MAC address */
t_uscalar_t gldm_ppa; /* Physical Point of */
/* Attachment (PPA) number */
dev_info_t *gldm_devinfo; /* Pointer to device's */
/* dev_info node */
ddi_iblock_cookie_tgldm_cookie; /* Device's interrupt */
/* block cookie */
int gldm_margin /* accepted data beyond */
/*gldm_maxpkt */
uint32_t gldm_capabilities; /* Device capabilities */


Below is a description of the members of the gld_mac_info structure that
are visible to the device driver.

gldm_private
This structure member is private to the device-specific
driver and is not used or modified by GLD.
Conventionally, this is used as a pointer to private
data, pointing to a driver-defined and driver-allocated
per-instance data structure.


The following group of structure members must be set by the driver before
calling gld_register(), and should not thereafter be modified by the
driver; gld_register() can use or cache the values of some of these
structure members, so changes made by the driver after calling
gld_register() might cause unpredicted results.

gldm_reset
Pointer to driver entry point; see gld(9E).


gldm_start
Pointer to driver entry point; see gld(9E).


gldm_stop
Pointer to driver entry point; see gld(9E).


gldm_set_mac_addr
Pointer to driver entry point; see gld(9E).


gldm_set_multicast
Pointer to driver entry point; see gld(9E).


gldm_set_promiscuous
Pointer to driver entry point; see gld(9E).


gldm_send
Pointer to driver entry point; see gld(9E).


gldm_intr
Pointer to driver entry point; see gld(9E).


gldm_get_stats
Pointer to driver entry point; see gld(9E).


gldm_ioctl
Pointer to driver entry point; can be NULL; see
gld(9E).


gldm_ident
Pointer to a string containing a short
description of the device. It is used to identify
the device in system messages.


gldm_type
The type of device the driver handles. The values
currently supported by GLD are DL_ETHER (IEEE
802.3 and Ethernet Bus), DL_TPR (IEEE 802.5 Token
Passing Ring), and DL_FDDI (ISO 9314-2 Fibre
Distributed Data Interface). This structure
member must be correctly set for GLD to function
properly.

Support for the DL_TPR and DL_FDDI media types is
obsolete and may be removed in a future release
of Solaris.


gldm_minpkt
Minimum Service Data Unit size -- the minimum
packet size, not including the MAC header, that
the device will transmit. This can be zero if the
device-specific driver can handle any required
padding.


gldm_maxpkt
Maximum Service Data Unit size -- the maximum
size of packet, not including the MAC header,
that can be transmitted by the device. For
Ethernet, this number is 1500.


gldm_addrlen
The length in bytes of physical addresses handled
by the device. For Ethernet, Token Ring, and
FDDI, the value of this structure member should
be 6.


gldm_saplen
The length in bytes of the Service Access Point
(SAP) address used by the driver. For GLD-based
drivers, this should always be set to -2, to
indicate that two-byte SAP values are supported
and that the SAP appears after the physical
address in a DLSAP address. See the description
under ``Message DL_INFO_ACK'' in the DLPI
specification for more details.


gldm_broadcast_addr
Pointer to an array of bytes of length
gldm_addrlen containing the broadcast address to
be used for transmit. The driver must allocate
space to hold the broadcast address, fill it in
with the appropriate value, and set
gldm_broadcast_addr to point at it. For Ethernet,
Token Ring, and FDDI, the broadcast address is
normally 0xFF-FF-FF-FF-FF-FF.


gldm_vendor_addr
Pointer to an array of bytes of length
gldm_addrlen containing the vendor-provided
network physical address of the device. The
driver must allocate space to hold the address,
fill it in with information read from the device,
and set gldm_vendor_addr to point at it.


gldm_ppa
The Physical Point of Attachment (PPA) number for
this instance of the device. Normally this
should be set to the instance number, returned
from ddi_get_instance(9F).


gldm_devinfo
Pointer to the dev_info node for this device.


gldm_cookie
The interrupt block cookie returned by
ddi_get_iblock_cookie(9F), ddi_add_intr(9F),
ddi_get_soft_iblock_cookie(9F), or
ddi_add_softintr(9F). This must correspond to the
device's receive interrupt, from which gld_recv()
is called.


gldm_margin
Drivers set this value to the amount of data in
bytes that the device can transmit beyond
gldm_maxpkt. For example, if an Ethernet device
can handle packets whose payload section is no
greater than 1522 bytes and the gldm_maxpkt is
set to 1500 (as is typical for Ethernet), then
gldm_margin is set to 22. The registered
gldm_margin value is reported in acknowledgements
of the DLIOCMARGININFO ioctl (see dlpi(7P)).


gldm_capabilities
Bit-field of device capabilities. If the device
is capable of reporting media link state, the
GLD_CAP_LINKSTATE bit should be set.


SEE ALSO


gld(7D), dlpi(7P), attach(9E), gld(9E), ddi_add_intr(9F), gld(9F),
gld_stats(9S)


Writing Device Drivers


June 7, 2004 GLD_MAC_INFO(9S)