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/dev/smc
x86
The SMC 8003/8013/8216/8416 Ethernet driver is a multi-threaded, loadable, clonable, STREAMS hardware driver supporting the connectionless Data Link Provider Interface, dlpi(7P) , over an SMC 80X3/8216/8416 Ethernet controller. Multiple SMC controllers installed within the system are supported by the driver. The smc driver provides basic support for the SMC hardware. Functions include chip initialization, frame transmit and receive, multicast and "promiscuous" support, and error recovery and reporting.
The smc 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 and indicates the corresponding device instance (unit) number. The unit numbers are assigned sequentially to each board found. The search order is determined by the order defined in the smc.conf file. 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) on last detach.
The values returned by the driver in the DL_INFO_ACK primitive in response to the DL_INFO_REQ from the user are as follows:
- The maximum SDU is 1500 (ETHERMTU - defined in <sys/ethernet.h>).
- The minimum SDU is 0.
- The dlsap address length is 8.
- The MAC type is DL_ETHER or DL_CSMACD .
- The sap length value is -2, meaning the physical address component is followed immediately by a 2-byte sap component within the DLSAP address.
- The service mode is DL_CLDLS .
- No optional quality of service (QOS ) support is included at present, so the QOS fields are 0.
- The provider style is DL_STYLE2 .
- The version is DL_VERSION_2 .
- The broadcast address value is Ethernet/IEEE broadcast address (FF:FF:FF:FF:FF:FF).
Once in the DL_ATTACHED state, the user must send a DL_BIND_REQ to associate a particular SAP (Service Access Pointer) with the stream. The smc driver interprets the sap field within the DL_BIND_REQ as an Ethernet ‘type.’ Therefore valid values for the sap field are in the [0-0xFFFF] range. Only one Ethernet ‘type’ can be bound to the stream at any time.
In addition to Ethernet V2 service, an ‘802.3 mode’ is provided by the driver and works as follows. sap values in the range [0-1500] are treated as equivalent and represent a desire by the user for ‘802.3 mode’. If the value of the sap field of the DL_BIND_REQ is within this range, then the driver computes the length, not including the initial M_PROTO message block, of all subsequent DL_UNITDATA_REQ messages and transmits 802.3 frames having this value in the MAC frame header length field. All frames received from the media having a ‘type’ field in this range are assumed to be 802.3 frames and are routed up all open streams that are bound to any sap value within this range. If more than one stream is in ‘802.3 mode,’ then the frame will be duplicated and routed up multiple streams as DL_UNITDATA_IND messages.
The smc 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 hardcode to this particular implementation-specific DLSAP address format but use information returned by 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, the user may transmit frames on the Ethernet by sending DL_UNITDATA_REQ messages to the smc driver. The smc driver will route received Ethernet frames up all those 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.
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
flag 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
flag set, this enables/disables reception
of all sap (Ethernet type) values. When used with the DL_PROMISC_MULTI
flag 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 that originally opened this stream must be superuser or EPERM is returned in the DL_ERROR_ACK . This primitive is destructive in that it affects all other current and future streams attached to this device. An M_ERROR message is sent up all other streams attached to this device when this primitive on this stream is successful. Once changed, all streams subsequently opened and attached to this device will obtain this new physical address. Once changed, the physical address will remain in effect until this primitive is used to change the physical address again or the system is rebooted, whichever comes first.
- intr
- Specifies the IRQ (Interrupt Request) level for the board.
- reg
- Specifies the shared RAM the board is jumpered for.
It is important to ensure that there are no conflicts for the board’s I/O port, shared RAM, or IRQ level.