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| ce - Cassini Gigabit-Ethernet device
driver |
SYNOPSIS
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The ce Sun Gigabit-Ethernet driver is a multi-threaded, loadable, clonable,
STREAMS hardware driver supporting the connectionless Data Link Provider Interface, dlpi(7P), over all
implementations of PCI Cassini Gigabit-Ethernet add-in adapters. Multiple
Cassini-based adapters installed within the system are supported by the driver.
The ce driver provides basic support for the Cassini-based
Ethernet hardware and handles the pci108e,abba (PCI Cassini) devices. Functions
include chip initialization, frame transmit and receive, multicast and promiscuous
support, and error recovery and reporting. The Cassini device provides 1000BASE-SX
networking interfaces using the Cassini ASIC external SERDES and fiber optical
transceiver, or 10/100/1000BASE-T using a Cassini ASIC attached to a GMII
twisted pair copper transceiver, or 10/100BASE-T using a Cassini ASIC attached
to a MII twisted pair copper transceiver.
The 1000Base-SX standard specifies an auto-negotiation protocol to automatically
select the mode of operation. In addition to the duplex mode of operation,
the Cassini ASIC can auto-negotiate for IEEE 802.3x
frame-based flow control capabilities. The Cassini PCS can perform auto-negotiation
with the link's remote-end (link partner) and receives the capabilities of
the remote end. It selects the highest common denominator mode of operation
based on the priorities. It also supports forced-mode of operation where
the driver selects the mode of operation.
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The /dev/ce cloning character-special device is
used to access all ce controllers installed on the system.
ce and DLPI
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The ce driver is a Style 2 data link service provider.
All M_PROTO and M_PCPROTO type messages are interpreted as DLPI primitives. Valid DLPI
primitives are defined in <sys/dlpi.h>. Refer to dlpi(7P) for more
information. An explicit DL_ATTACH_REQ
message by the user is required to associate the opened stream with a particular
device (ppa). The ppa ID is interpreted
as an unsigned long data type and indicates the corresponding
device instance (unit) number. An error (DL_ERROR_ACK)
is returned by the driver if the ppa field value does not
correspond to a valid device instance number for this system. The device is
initialized on first attach and de-initialized (stopped) upon last detach.
The values returned by the driver in the DL_INFO_ACK primitive in response to the DL_INFO_REQ are as follows:
- Maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>).
- Minimum SDU is 0.
- The dlsap address length is 8.
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MAC type is DL_ETHER.
- The sap length value is -2 meaning
the physical address component is followed immediately by a 2 byte sap component within the DLSAP
address.
- Service mode is DL_CLDLS.
- Optional quality of service (QOS) is not supported; the QOS
fields are 0.
- Provider style is DL_STYLE2.
- Version is DL_VERSION_2.
- Broadcast address value is Ethernet/IEEE broadcast address
(0xFFFFFF.)
Once in the DL_ATTACHED state,
you must send a DL_BIND_REQ to associate
a particular SAP (Service Access Pointer)
with the stream. The ce driver interprets the sap field within the DL_BIND_REQ as an Ethernet "type," therefore valid values for the sap field are in the range [0-0xFFFF]. Only
one Ethernet type can be bound to the stream at any time.
If you select a sap with a value of 0, the receiver will be in 802.3 mode.
All frames received from the media having a "type" field in the
range [0-1500] are assumed to be 802.3
frames and are routed up all open streams which are bound to sap value 0 . If more than one stream is
in 802.3 mode, the frame will be duplicated and routed
up multiple streams as DL_UNITDATA_IND
messages.
In transmission, the driver checks the sap field
of the DL_BIND_REQ to verify that
the sap value is 0, and that the destination
type field is in the range [0-1500]. If either is true,
the driver computes the length of the message, not including initial M_PROTO mblk (message block), of all subsequent DL_UNITDATA_REQ messages and transmits 802.3 frames that have this value in the MAC frame header length
field.
The ce driver DLSAP address format consists of the 6 byte physical (Ethernet) address
component followed immediately by the 2 byte sap (type)
component producing an 8 byte DLSAP
address. Applications should not hard code to this particular
implementation-specific DLSAP address
format, but use information returned in the DL_INFO_ACK primitive to compose and decompose DLSAP addresses. The sap length, full DLSAP length, and sap/physical
ordering are included within the DL_INFO_ACK. The physical address length can be computed by subtracting the sap length from the full DLSAP address length or by issuing the DL_PHYS_ADDR_REQ to obtain the current physical address associated
with the stream.
Once in the DL_BOUND state,
you can transmit frames on the Ethernet by sending DL_UNITDATA_REQ messages to the ce driver. The ce driver will route received Ethernet frames up all open and bound
streams having a sap which matches the Ethernet type as DL_UNITDATA_IND messages. Received Ethernet
frames are duplicated and routed up multiple open streams, if necessary. The DLSAP address contained within the DL_UNITDATA_REQ and DL_UNITDATA_IND messages consists of both the sap
(type) and physical (Ethernet) components.
In addition to the mandatory connectionless DLPI message set, the driver additionally supports the following
primitives.
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ce Primitives
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The DL_ENABMULTI_REQ and DL_DISABMULTI_REQ primitives enable/disable
reception of individual multicast group addresses. A set of multicast addresses
may be iteratively created and modified on a per-stream basis using these
primitives. These primitives are accepted by the driver in any state following DL_ATTACHED.
The DL_PROMISCON_REQ and DL_PROMISCOFF_REQ primitives with the DL_PROMISC_PHYS option set in the dl_level field enables/disables reception of all "promiscuous
mode" frames on the media, including frames generated by the local host.
When used with the DL_PROMISC_SAP
option set, this enables/disables reception of all sap
(Ethernet type) values. When used with the DL_PROMISC_MULTI option set this enables/disables reception of all
multicast group addresses. The effect of each is always on a per-stream basis
and independent of the other sap and physical level configurations
on this stream or other streams.
The DL_PHYS_ADDR_REQ primitive
returns the 6 octet Ethernet address currently associated (attached) to the
stream in the DL_PHYS_ADDR_ACK primitive.
This primitive is valid only in states following a successful DL_ATTACH_REQ.
The DL_SET_PHYS_ADDR_REQ primitive
changes the 6 octet Ethernet address currently associated (attached) to this
stream. The credentials of the process which originally opened this stream
must be superuser. Otherwise EPERM is returned in
the DL_ERROR_ACK. This primitive
is destructive because it affects all other current and future streams attached
to this device. An M_ERROR is
sent up all other streams attached to this device when this primitive is successful
on this stream. Once changed, all streams subsequently opened and attached
to this device will obtain this new physical address. Once changed, the physical
address will remain until this primitive is used to change the physical address
again or the system is rebooted, whichever comes first.
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ce DRIVER
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By default, the ce driver performs auto-negotiation
to select the mode and flow control capabilities of the link.
The link can assume one of the following modes:
- 1000 Mbps, full-duplex
- 1000 Mbps, half-duplex
- Symmetric pause
- Asymmetric pause
Speeds and modes are described in the 1000Base-TX standard.
The auto-negotiation protocol automatically selects:
- Operation mode (half-duplex or full-duplex)
- Flow control capability (symmetric and/or asymmetric)
The auto-negotiation protocol does the following:
- Gets all modes of operation supported by the link partner.
- Advertises its capabilities to the link partner.
- Selects the highest common denominator mode of operation based
on the priorities.
The Cassini hardware can operate in all modes listed above, providing
auto-negotiation is used by default to bring up the link and select the common
mode of operation with the link partner. The PCS also supports forced-mode
of operation in which the driver can select the mode of operation and the
flow control capabilities, using the ndd utility.
The Cassini device also supports programmable IPG (Inter-Packet Gap)
parameters ipg1 and ipg2. By default, the driver sets ipg1 and ipg2 to 8
and 4 byte-times respectively (which are the standard values). If desired,
you can alter these values from the standard 1000 Mpbs IPG set to 0.096 microseconds.
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ce Parameter List
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The ce driver enables the setting and getting of
various parameters for the Cassini device. The parameter list includes current transceiver status, current link status, inter-packet gap, PCS capabilities and link partner capabilities.
The PCS features two set of capabilities. One set reflects the capabilities
of the hardware and are read-only. The second set, which reflects the values
you choose, are used in speed selection and possess read/write capabilities.
At boot time, these two sets of capabilities are the same. The link partner
capabilities are also read-only because the current default value of these
parameters can be read but not modified.
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/dev/ce
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ce special character
device.
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/kernel/drv/ce.conf
- System-wide default device driver properties
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