Implementing the Interrupt Section | Compaq AA-RNG2A-TE guide

13

Implementing the Interrupt Section

The interrupt section of a network device driver contains the code that is called whenever the network interface transmits or receives a frame.

The if_el device driver implements the following routines in its interrupt section:

•el_intr( ) (Section 13.1)

•el_rint( ) (Section 13.2)

•el_tint( ) (Section 13.3)

•el_error( ) (Section 13.4)

______________________ Note _______________________

The if_el device driver implements a shared interrupt handler. A shared interrupt handler is a driver routine that is registered to take advantage of the shared interrupt framework that Tru64 UNIX provides for hardware devices that share an interrupt line.

The ISA bus does not currently support shared interrupts.

13.1 Implementing the el_intr Routine

The if_el device driver implements an interrupt handler called el_intr( ), which performs the following tasks:

•Sets the interrupt and priority level (IPL) and obtains the simple lock (Section 13.1.1)

•Rearms the next timeout (Section 13.1.2)

•Reads the interrupt status (Section 13.1.3)

•Processes completed receive and transmit operations (Section 13.1.4)

•Acknowledges the interrupt (Section 13.1.5)

•Transmits pending frames (Section 13.1.6)

•Releases the simple lock and resets the IPL (Section 13.1.7)

•Indicates that the interrupt was serviced (Section 13.1.8)

Implementing the Interrupt Section 13–1

Image 139

Compaq AA-RNG2A-TE manual Implementing the Interrupt Section, Implementing the elintr Routine

Contents

Compaq Computer Corporation Houston, Texas December Product VersionPage Contents Implementing the Autoconfiguration Support Section probe Implementing the Configure Section Implementing the unattach Routine Implementing the Autoconfiguration Support Section attach Implementing the Start Section Implementing the Initialization Section Implementing a Watchdog Section Implementing the Reset SectionImplementing the ioctl Section Implementing the Interrupt Section Network Device Driver Configuration Index Tables Page Audience About This Manual Scope of this Manual Organization New and Changed Features Examples Related Documentation Reference Pages Reader’s Comments Conventions That are used in driver configuration, these brackets Page Network Device Driver Environment Network Device Driver Include Files Section for a Network Driver Declarations Section for a Network Driver External and Forward Declarations Declaring softc and controller Data Structure Arrays Defining Driver-Specific Macros Declaring and Initializing the driver Data Structure 8Network Device Driver Environment MacroDescription Driver-Specific Macros Start Section for a Network Driver Configure Section for a Network DriverAutoconfiguration Support Section for a Network Driver Initialization Section for a Network Driver Interrupt Section for a Network Driver Reset Section for a Network DriverWatchdog Section for a Network Driver Ioctl Section for a Network Driver 12Network Device Driver Environment Interrupt and Status Register Offset Definitions Defining Device Register Offsets Command Port Register Offset Definitions Defining Device Register Offsets Window 0 Configuration Register Offset Definitions W0CCR Register Constant Defines the offset for the resource configuration register Window 3 Configuration Register Offset Definitions Window 3 Configuration Registers Window 1 Operational Registers Window 1 Operational Register Offset Definitions 10Defining Device Register Offsets Mdncrc Window 4 Diagnostic Register Offset Definitions 12Defining Device Register Offsets Eeprom Data Structure Definition Page Shows a typical softc data structure Defining the softc Data Structure 2Defining the softc Data Structure Defining Common Information Defining the softc Data Structure Defining Media State Information Enabling Support for Enhanced Hardware Management Media state has been determined Defining CSR Pointer Information Defining the Base RegisterDefining Multicast Table Information Defining the Interrupt Handler ID Defining Bus-Specific Information Defining Fifo Maintenance Information Defining the Broadcast Flag Defining Interrupt and Timeout StatisticsDefining the Debug Flag Defining the Polling Context Flag Defining Autosense Kernel Thread Context Information Declaring the Simple Lock Data Structure Defining a Copy of the w3eeprom Data Structure Implementing the Configure Section Etc/sysconfigtab database Following code shows how to set up the elconfigure routine Setting Up the elconfigure Routine 4Implementing the Configure Section Implementing the elprobe Routine Implementing the Autoconfiguration Support Section probe Following code shows how to set up the elprobe routine Setting Up the elprobe Routine Implementing the Autoconfiguration Support Section probe Performing Bus-Specific Tasks 4Implementing the Autoconfiguration Support Section probe Implementing the Autoconfiguration Support Section probe Allocating Memory for the softc Data Structure 6Implementing the Autoconfiguration Support Section probe Allocating the etherdriver Data Structure Computing the CSR Addresses Setting Bus-Specific Data Structure Members Implementing the Autoconfiguration Support Section probe Handling First-Time Probe Operations 10Implementing the Autoconfiguration Support Section probe Implementing the Autoconfiguration Support Section probe Handling Subsequent Probe Operations 12Implementing the Autoconfiguration Support Section probe Implementing the Autoconfiguration Support Section probe Registering the Interrupt Handler Implementing the Autoconfiguration Support Section probe Trying to Allocate Another controller Data Structure Saving the controller and softc Data Structure Pointers Implementing the elautosensethread Routine Implementing the elshutdown RoutineRegistering the shutdown Routine 18Implementing the Autoconfiguration Support Section probe Blocking Until Awakened Setting Up the elautosensethread Routine Starting Up Statistics Testing for the Termination FlagEntering the Packet Transmit Loop Saving Counters Prior to the Transmit Operation Using the Default from the ROMAllocating Memory for a Test Packet Building the Test Packet Setting the Media in the HardwareTransmitting the Test Packet Testing for Loss of Carrier Setting a Timer for the Current Kernel Thread Determining Whether Packets Were Transmitted Successfully Setting Up New MediaPrinting Debug Information Establishing the Media 26Implementing the Autoconfiguration Support Section probe Setting Up the elattach Routine Implementing the Autoconfiguration Support Section attach Initializing the Media Address and Media Header Lengths Setting Up the Media 4Implementing the Autoconfiguration Support Section attach Initializing Simple Lock Information Specifying the Network Driver Interfaces Printing a Success Message Signifies that the network interface supports Attaching to the Packet Filter and the Network Layer Setting the Baud Rate Handling the Reinsert Operation Setting Network Attributes and Registering the Adapter Starting the Polling Process Enabling the Interrupt Handler Implementing the unattach Routine Setting Up the elunattach Routine Obtaining the Simple Lock and Shutting Down the Device Verifying That the Interface Has Shut Down Terminating the Autosense Kernel Thread Disabling the Interrupt Handler Terminating the Simple Lock Unregistering the Pcmcia Event Callback RoutineStopping the Polling Process Unregistering the Shutdown Routine Freeing Resources Unregistering the Card from the Hardware Management DatabasePage Implementing the Initialization Section Setting Up the elinit RoutineImplementing the elinit Routine Determining Whether the Pcmcia Card Is Present Setting the IPL and Obtaining the Simple Lock Returning the Status from the elinitlocked Routine Releasing the Simple Lock and Resetting the IPLImplementing the elinitlocked Routine Calling the elinitlocked Routine Clearing Interrupts Resetting the Transmitter and Receiver Ensuring That the 10Base2 Transceiver Is Off Starting the Device Setting the LAN Media Resetting the Transmitter and Receiver Again Setting a LAN AttributeSelecting Memory Mapping Processing Special Flags Setting the LAN Address Enabling TX and RX Setting the Debug Flag Enabling Interrupts Setting the Operational WindowMarking the Device as Running Starting the Transmit of Pending Packets Starting the Autosense Kernel ThreadPage Implementing the elstart Routine Implementing the Start Section Calling the elstartlocked Routine Implementing the elstartlocked Routine 4Implementing the Start Section Implementing the Start Section Handlelongword Transmitting the Buffer Accounting for Outgoing Bytes Indicating When to Start the Watchdog Routine Implementing a Watchdog Section Setting the IPL and Obtaining the Simple Lock Releasing the Simple Lock and Resetting the IPL Implementing the elreset Routine Implementing the Reset Section Implementing the elresetlocked Routine Implementing the ioctl Section Ioctl Command Required Description For More Information Following code shows how to set up the elioctl routine Setting Up the elioctl Routine Setting the IPL and Obtaining the Simple Lock Disabling Loopback Mode Siocdisablback ioctl Command Enabling Loopback Mode Siocenablback ioctl Command Setting the Local MAC Address Siocsphysaddr ioctl Command 12-6Implementing the ioctl Section Implementing the ioctl Section Determines whether the cmd argument is Siocrdctrs or Network Interface Counter Types Bringing Up the Device Siocsifaddr ioctl Command Setting the IP MTU Siocsipmtu ioctl Command Using Currently Set Flags Siocsifflags ioctl CommandSetting the Media Speed Siocsmacspeed ioctl Command Setting Device Characteristics Siocifsetchar ioctl Command Resetting the Device Siocifreset ioctl Command 12-12Implementing the ioctl Section If lockon 1 simpleunlock&sc-elsoftclock splxs Return status Page Implementing the elintr Routine Implementing the Interrupt Section Rearming the Next Timeout Processing Completed Receive and Transmit Operations Reading the Interrupt Status Transmitting Pending Frames Acknowledging the Interrupt Implementing the elrint Routine Indicating That the Interrupt Was Serviced Pulling the Packets from the Fifo Buffer Examining the First Part of the Packet 13-8Implementing the Interrupt Section Copying the Received Packet into the mbuf Discarding a Packet Counting the Transmit Interrupt Implementing the eltint Routine Writing to the Status Register to Obtain the Next Value Managing Excessive Data Collisions Queuing Other Transmits Implementing the elerror Routine Network Device Driver Configuration Page Index-1 Index Index-2 Declarations section, 1-4devdriver.h header file, 1-4device Index-3 Interrupt Index-4 Interrupt handler Index-5 Packet Index-6 ROM Index-7 Transmit