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9

Implementing the Start Section

The start section of a network device driver transmits data packets across
the network. When the network protocol has a data packet to transmit,
it prepares the packet, then calls the

start

interface for the appropriate

network device driver. The

start

interface transmits the packet. When

the transmission is complete, it frees up the buffers that are associated
with the packet.

The

if_el

device driver implements the following routines in its start

section:

•

el_start( )

(Section 9.1)

•

el_start_locked( )

(Section 9.2)

9.1 Implementing the el_start Routine

The

el_start( )

routine is a jacket routine that performs the following

tasks:

•

Sets the IPL and obtains the simple lock (Section 9.1.1)

•

Calls the

el_start_locked( )

routine (Section 9.1.2)

•

Releases the simple lock and resets the IPL (Section 9.1.3)

9.1.1 Setting the IPL and Obtaining the Simple Lock

The following code shows how the

el_start( )

routine sets the IPL and

acquires the simple lock.

static void el_start(struct ifnet *ifp)

{

register int unit = ifp->if_unit, s;

register struct el_softc *sc = el_softc[unit];

s = splimp();

1

if (!simple_lock_try(&sc->el_softc_lock)) {

2

splx(s);

3

return;

}

1

Calls the

splimp( )

routine to mask all LAN hardware interrupts.

On successful completion,

splimp( )

stores an integer value in the

s

variable. This integer value represents the CPU priority level that
existed before the call to

splimp( )

.

Implementing the Start Section 9–1

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Содержание Tru64 UNIX

Страница 1: ...2000 Product Version Device Driver Kit Version 2 0 Operating System and Version Tru64 UNIX Version 5 0A or higher This manual contains information that systems engineers need to write network device...

Страница 2: ...red for possession use or copying Consistent with FAR 12 211 and 12 212 Commercial Computer Software Computer Software Documentation and Technical Data for Commercial Items are licensed to the U S Gov...

Страница 3: ...on for a Network Driver 1 11 1 9 ioctl Section for a Network Driver 1 11 1 10 Interrupt Section for a Network Driver 1 11 1 11 Output Section for a Network Driver 1 11 2 Defining Device Register Offse...

Страница 4: ...be Routine 5 2 5 1 2 Checking the Maximum Number of Devices That the Driver Supports 5 4 5 1 3 Performing Bus Specific Tasks 5 4 5 1 4 Allocating Memory for the softc Data Structure 5 6 5 1 5 Allocati...

Страница 5: ...and Media Header Lengths 6 2 6 3 Setting Up the Media 6 3 6 4 Initializing Simple Lock Information 6 5 6 5 Printing a Success Message 6 6 6 6 Specifying the Network Driver Interfaces 6 6 6 7 Setting...

Страница 6: ...ia 8 6 8 2 6 Setting a LAN Attribute 8 7 8 2 7 Selecting Memory Mapping 8 7 8 2 8 Resetting the Transmitter and Receiver Again 8 7 8 2 9 Setting the LAN Address 8 8 8 2 10 Processing Special Flags 8 8...

Страница 7: ...r the User Has Removed the PCMCIA Card from the Slot 12 3 12 3 Setting the IPL and Obtaining the Simple Lock 12 3 12 4 Enabling Loopback Mode SIOCENABLBACK ioctl Command 12 4 12 5 Disabling Loopback M...

Страница 8: ...the el_rint Routine 13 5 13 2 1 Counting the Receive Interrupt and Reading the Receive Status 13 5 13 2 2 Pulling the Packets from the FIFO Buffer 13 6 13 2 3 Examining the First Part of the Packet 13...

Страница 9: ...gnostic Registers 2 11 3 1 Typical softc Data Structure 3 2 3 2 Mapping Alternate Names 3 4 Tables 1 1 Driver Specific Macros 1 9 12 1 Network ioctl Commands 12 1 12 2 Network Interface Counter Types...

Страница 10: ......

Страница 11: ...on linked list data structures and multitasking Understand the hardware device for which the driver is being written Understand the basics of the CPU hardware architecture including interrupts direct...

Страница 12: ...on is published by 3Com Corporation and the manual part number is 09 0398 002B You can access the if_el source code in the device driver examples directory if you have installed it on your system Ethe...

Страница 13: ...the sections that make up a network driver and compares them to the sections that are associated with block and character drivers Chapter 2 Describes the device register offset definitions for the if...

Страница 14: ...plement an interrupt handler using the if_el device driver s el_intr interrupt handler as an example Chapter 14 Describes the sysconfigtab option entries necessary for configuring network device drive...

Страница 15: ...e and analyze a crash dump file Programming Support Tools describes several commands and utilities in the Tru64 UNIX system including facilities for text manipulation macro and program generation and...

Страница 16: ...to the appropriate Compaq technical support office Information provided with the software media explains how to send problem reports to Compaq Conventions This manual uses the following conventions A...

Страница 17: ...ation these brackets indicate items that are optional Vertical bars separating items that appear in the syntax definitions used in driver configuration indicate that you choose one item from among tho...

Страница 18: ......

Страница 19: ...A configure section Section 1 3 An autoconfiguration support section Section 1 4 An ioctl section Section 1 9 An interrupt section Section 1 10 Similar to a character device driver a network device d...

Страница 20: ...on Reset Section Watchdog Section ZK 0818U AI Unlike for block and character drivers you do not specify network driver entry points in the dsent data structure This means that a network driver has no...

Страница 21: ...network In the case of the Ethernet network interface the upper level code never hands off to the driver a single packet that exceeds 1514 bytes 1 1 Include Files Section for a Network Driver A netwo...

Страница 22: ...header file if_fddi h If you are writing the network driver for Token Ring media you also include the header file if_trn h 4 Includes the devdriver h header file which defines common device driver dat...

Страница 23: ...ocked struct el_softc struct ifnet int static int el_init int static void el_start_locked struct el_softc struct ifnet static void el_start struct ifnet static int el_watch int static void el_reset_lo...

Страница 24: ...struct controller el_info el_MAXDEV 0 3 static int el_isa_tag 0 4 static int el_isa_reset 0 5 decl_simple_lock_info static el_lock_info 6 1 Defines a constant called el_MAXDEV which allocates data str...

Страница 25: ...he if_el driver initializes the following members to nonzero values probe which specifies the driver s probe interface el_probe cattach which specifies the driver s controller attach interface el_atta...

Страница 26: ...fine READ_STS sc READ_BUS_D16 sc regE mb define WRITE_DATA sc val WRITE_BUS_D32 sc data val mb define READ_DATA sc READ_BUS_D32 sc data mb define READ_ND sc READ_BUS_D16 sc reg6 mb define WRITE_ND sc...

Страница 27: ...on control register READ_ACR and WRITE_ACR Read from and write to the 3Com 3C5x9 device s address control register WRITE_RCR Write to the 3Com 3C5x9 device s resource configuration register WRITE_ECR...

Страница 28: ...ation support section for a network device driver contains the following entry points A probe interface which determines if the network device exists and is functional on the system An attach interfac...

Страница 29: ...to do with data packet transmission and reception Typically these tasks relate to turning specific features of the hardware on or off The ioctl section contains an ioctl interface You define this entr...

Страница 30: ...interface to transmit the data All network drivers must set the output member of the ifnet data structure to ether_output 1 12 Network Device Driver Environment...

Страница 31: ...registers However this device register header file can serve as an example of how to set up device register offset definitions See your network device documentation to learn about control and status r...

Страница 32: ..._WINDOW0 0x1 11 0x0 3 define CMD_WINDOW1 0x1 11 0x1 4 define CMD_WINDOW2 0x1 11 0x2 5 define CMD_WINDOW3 0x1 11 0x3 6 define CMD_WINDOW4 0x1 11 0x4 7 define CMD_WINDOW5 0x1 11 0x5 8 define CMD_WINDOW6...

Страница 33: ...stic purposes 8 Defines a second window selector for commands that are used for diagnostic purposes 9 Defines the window selector for commands that are related to gathering device statistics 10 Define...

Страница 34: ...ines the transmit TX start threshold command 27 Defines the statistics enable command 28 Defines the statistics disable command 29 Defines the stop 10Base2 Ethernet cable command 30 Defines the receiv...

Страница 35: ...ters that make up the window 0 configuration register define W0_MID 0x0 1 define W0_AID 0x2 2 define W0_CCR 0x4 3 enum w0_ccr 4 CCR_PCMCIA 0x4000 CCR_AUI 0x2000 CCR_10B2 0x1000 CCR_ENDEC 0x0100 CCR_RE...

Страница 36: ...r 5 Defines the offset for the address control register 6 Defines an enumerated data type called w0_acr The if_el device driver can assign one of the following values to W0_ACR the address control reg...

Страница 37: ...that the EEPROM is in test mode ECR_CMD Represents EEPROM command bits ECR_READ Represents an EEPROM read command ECR_WRITE Represents an EEPROM write command ECR_ERASE Represents an EEPROM erase com...

Страница 38: ...0000002 1 Defines the offset for the additional setup information register 2 2 Defines the offset for the additional setup information register 0 3 Defines an enumerated data type called w3_asi The if...

Страница 39: ...W1_RXSTAT Transmit Status Register W1_TXSTAT Request Interrupt After Transmit Completion Register TX_INT Receive Data Register W1_RXDATA Transmit Data Register W1_TXDATA Free Transmit Bytes Register...

Страница 40: ...BYTES Mask used to determine the number of bytes received 3 Defines the offset for the transmit status register 4 Defines an enumerated data type called w1_txstat The if_el device driver can assign on...

Страница 41: ...W4_NET The following code shows the definitions for the window 4 diagnostic registers define W4_MEDIA 0xa 1 enum w4_media 2 MD_TPE 0x8000 MD_COAXE 0x4000 MD_RES1 0x2000 MD_SQE 0x1000 MD_VLB 0x0800 MD...

Страница 42: ...ed MD_COLL Indicates that collisions occurred MD_SQEE Indicates that SQE stats were enabled MD_NCRC Indicates that the CRC strip was disabled 3 Defines the offset for the network diagnostic port regis...

Страница 43: ...M data structure called w3_eeprom This data structure has the following members addr Contains the local area network LAN address pid Contains the product ID mandata Contains manufacturing data mid Con...

Страница 44: ......

Страница 45: ...tion 3 4 Multicast table information Section 3 5 Interrupt handler ID declaration Section 3 6 CSR pointer information Section 3 7 FIFO maintenance information Section 3 8 Bus specific information Sect...

Страница 46: ...e drivers provide in the associated softc data structure and a double asterisk denotes information that is specific to the hardware or bus 3 1 Defining Common Information The common information in a l...

Страница 47: ...tructure to the alternate name ctrblk The ess_ctrblk member is referred to as the counter block and is actually an instance of the estat data structure Figure 3 2 shows the ctrblk alternate name and a...

Страница 48: ...for defining and exporting these attributes To use these routines a network driver must declare a net_hw_mgmt data structure as shown by the following code struct net_hw_mgmt ehm 1 1 Declares a net_hw...

Страница 49: ...ENSE The hardware determines the media 3 Defines an alternate name for referencing the lan_media_state member of the lan_media data structure The lan_media_state member will be set only if lan_media_m...

Страница 50: ...f_el device driver s el_softc data structure Most network device drivers declare this data structure in their softc data structure struct lan_multi is_multi 1 1 Declares a lan_multi data structure and...

Страница 51: ...value that the device keeps on board The following code shows its declaration This information is hardware specific so you can omit it from your network device driver s softc data structure unsigned...

Страница 52: ...ver and therefore is optional in most network device drivers The following code shows the declaration of the broadcast flag in the if_el device driver s el_softc data structure int is_broadcast 1 1 Co...

Страница 53: ...utosense kernel thread variables in the if_el device driver s el_softc data structure The if_el device driver uses kernel threads to perform the tasks that are related to autosensing the media However...

Страница 54: ...ata structure contains the declaration of a simple lock data structure The if_el driver uses a simple lock to protect the data integrity of the el_softc data structure on multiprocessor systems It als...

Страница 55: ...led lan_configure Routines with the prefix lan_ reside in the lan_common c source file A network driver s configure routine can simply call lan_configure to carry out the following tasks CFG_OP_CONFIG...

Страница 56: ...array is where the cfgmgr framework stores the value for the PCMCIA_Option attribute The cfgmgr framework obtains this value from the etc sysconfigtab database 2 Declares a character array called isa...

Страница 57: ..._Per_Second attribute which is specific to this device driver It indicates the polls per second for interrupt processing Similar to the Polling attribute you can only specify a value for this attribut...

Страница 58: ...luded in indata 4 Declares an argument for user defined configuration operations which can occur when the cfgmgr framework calls the driver s configure interface with the CFG_OP_USERDEFINED operation...

Страница 59: ...evice driver kit The following sections describe how to use the probe interface Implementing the el_probe routine Section 5 1 Implementing the el_shutdown routine Section 5 2 Implementing the el_autos...

Страница 60: ...vice register or memory that is located in bus address space either I O space or memory space This I O handle references the device s I O address space for the bus where the read operation originates...

Страница 61: ...2 8 Declares a variable called reg that stores the I O handle that is passed to the driver s el_probe routine 9 Declares an e_port data structure called port_sel This data structure is associated with...

Страница 62: ...ntrollers that the if_el driver can support 2 Returns the value 0 zero to indicate that the probe operation failed 5 1 3 Performing Bus Specific Tasks The following code shows how the el_probe routine...

Страница 63: ...ociated with this 3Com 3C5x9 device 2 Performs tasks related to the PCMCIA bus if bus_type evaluates to the constant BUS_PCMCIA 3 Adds the I O handle to the base address of the card and stores it in t...

Страница 64: ...em calls the el_isa_reset_all routine to reset all 3Com 3C5x9 adapters on the ISA bus once to clear any bad state data 14 Calls the el_isa_activate routine to attempt to activate the lowest addressed...

Страница 65: ...user did not remove and replace the card calls the MALLOC macro to allocate memory for the el_softc data structure 3 If MALLOC could not allocate the memory calls the printf routine to display an appr...

Страница 66: ...regC reg 0xc 2 sc regA reg 0xa sc reg8 reg 0x8 sc reg6 reg 0x6 sc reg4 reg 0x4 sc reg2 reg 0x2 sc reg0 reg 0x0 sc data reg 0x0 sc basereg reg 3 1 Fills in the regE member of the el_softc data structu...

Страница 67: ...evaluates to BUS_PCMCIA 3 Sets the interrupt request IRQ to the value 3 4 Sets the I O base of the program card to the value 0 zero 5 Indicates that this is a PCMCIA unit and saves the card informatio...

Страница 68: ...le tuple_infop if status SUCCESS tuple_data_infop TupleOffset 0 tuple_data_infop TupleDataMax u_short TUPLE_DATA_MAX status GetTupleData tuple_data_infop if status SUCCESS ee unsigned char sc eeprom f...

Страница 69: ...oes not need to redo much of the initial probe work and will skip to the code shown in Section 5 1 10 2 If this is a multifunction card reads the EEPROM data and saves it in sc eeprom If this is a mul...

Страница 70: ...ice 12 Frees up any memory that was allocated for enhanced hardware management and unregisters this card from the hardware management database 13 Calls the FREE macro which frees the memory that was p...

Страница 71: ...ove return 0 else 2 ed unsigned short ee_copy for i 0 i sizeof struct w3_eeprom 2 i WRITE_ECR sc ECR_READ i DELAY 1000 ed READ_EDR sc ed if bcmp sc eeprom addr ee_copy addr 6 3 for i 0 i 3 i 4 j sc ee...

Страница 72: ...e hardware address that is currently in effect uses the hardware address that was found in the EEPROM Because the EEPROM has changed because the old if_el adapter was removed and a new one inserted it...

Страница 73: ...ucture to el_intr which is the if_el device driver s interrupt handler 3 Sets the param member of the el_intr_info data structure to the controller number for the controller data structure for this 3C...

Страница 74: ...for this instance of the 3Com 3C5x9 device in the array of el_softc data structures The unit number is the offset to the data structure within the el_softc array 2 Saves the controller data structure...

Страница 75: ...ws static void el_shutdown struct el_softc sc 1 WRITE_CMD sc CMD_RESET 2 DELAY 1000 3 1 Specifies the argument that the kernel passes to the routine which is a pointer to the driver s el_softc data st...

Страница 76: ...dia is thin wire LAN_MEDIA_AUI The media is the attachment unit interface AUI The lm_media_state member specifies the current state of the autosensing procedure as follows LAN_MEDIA_STATE_SENSING The...

Страница 77: ...the message to transmit when trying to determine the mode of the device 2 Declares a pointer to the el_softc data structure and calls it sc 3 Declares a pointer to an ifnet data structure and calls it...

Страница 78: ...ling the thread_halt_self routine The thread_halt_self routine does not return to the caller 5 3 4 Starting Up Statistics The following code shows how the el_autosense_thread routine starts up statist...

Страница 79: ..._PASSES m NULL if m m_freem m printf el d Autosense thread cannot determine media n ifp if_unit printf el d Use lan_config to configure if necessary n ifp if_unit else printf el d Autosense thread can...

Страница 80: ...the el_autosense_thread routine builds a test packet to transmit bcopy el_junk_msg mtod m caddr_t EL_JUNK_SIZE 1 bcopy sc is_addr mtod m caddr_t 6 2 bcopy sc is_addr mtod m caddr_t 6 6 3 m m_pkthdr le...

Страница 81: ...thread_block 5 3 13 Testing for Loss of Carrier The following code shows how the el_autosense_thread routine tests for loss of carrier link_beat 0 1 switch sc lm_media case LAN_MEDIA_UTP s splimp simp...

Страница 82: ...ines whether traffic went out successfully 5 3 15 Printing Debug Information The following code shows how the el_autosense_thread routine prints debug information if sc debug 1 if prev_err ifp if_oerr...

Страница 83: ...d Autosense selected s media n ifp if_unit lan_media_strings_10 sc lm_media s splimp 2 simple_lock sc el_softc_lock 3 WRITE_CMD sc CMD_STATSDIS 4 simple_unlock sc el_softc_lock 5 splx s 6 1 Sets the l...

Страница 84: ...l_simple_lock_data routine 4 Calls the WRITE_CMD macro to write data to the command port register In this call el_autosense_thread passes the if_el driver s el_softc data structure pointer The data to...

Страница 85: ...ssage Section 6 5 Specifies the network driver interfaces Section 6 6 Sets the baud rate Section 6 7 Attaches to the packet filter and the network layer Section 6 8 Sets network attributes and registe...

Страница 86: ...called sin 6 2 Initializing the Media Address and Media Header Lengths The el_attach routine sets up the media s address length and header length as follows if sc reprobe 1 ctlr alive ALV_STATIC 2 if...

Страница 87: ...addr 7 sin sin_family AF_INET 8 1 Sets the ac_bcastaddr member of the softc data structure for this device to the Ethernet broadcast address The system stores the Ethernet broadcast address in the eth...

Страница 88: ...for this device to the maximum transmission unit for the media which for Ethernet related media is represented by the constant ETHERMTU Typically you set this member to the same constant that is used...

Страница 89: ...execute on a single the master CPU This setting is not recommended You are encouraged to make your driver SMP safe NETALLCPU Specifies that you do not want to funnel the network device driver because...

Страница 90: ...er_sprintf routine The ether_sprintf routine converts an Ethernet address to a printable ASCII string representation Make sure that your driver prints a similar message during its attach routine 6 6 S...

Страница 91: ...ies that the network interface supports broadcasting and that the associated broadcast address is valid IFF_MULTICAST Signifies that the network interface supports multicast IFF_NOTRAILERS Signifies t...

Страница 92: ...THER_BAND WIDTH_100MB constant FDDI_BANDWIDTH_100MB FDDI line speed is 100 megabits per second The if_fddi h file defines the FDDI_BANDWIDTH_100MB constant TRN_BANDWIDTH_4MB Token Ring line speed is 4...

Страница 93: ...2 Registers the adapter with EHM 6 10 Handling the Reinsert Operation If the user has reinserted the PCMCIA card the if_el device driver does not need to initialize the media address and media length...

Страница 94: ...g_flag 0 2 return 0 1 Starts the polling process if the el_polling attribute specifies that polling is to be done To start the polling process el_attach sets the polling_flag member to 1 true then cal...

Страница 95: ...wn Section 7 2 Obtains and releases the simple lock Section 7 3 Disables the interrupt handler Section 7 4 Terminates the autosense thread Section 7 5 Unregisters the PCMCIA event callback routine Sec...

Страница 96: ...Make sure that other errors returned by if_detach do not stop interface shutdown status if_detach ifp 1 if status EBUSY 2 return status else if status ESUCCESS 3 detachpfilter sc is_ed ifp if_flags I...

Страница 97: ...Calls the splx routine to reset the CPU priority to the level that is stored in the s variable 7 4 Disabling the Interrupt Handler The following code shows how the el_unattach routine disables and de...

Страница 98: ...void ifp if_unit 2 sc polling_flag 0 3 simple_unlock sc el_softc_lock splx s 1 Stops the polling process if polling had originally been requested by the user 2 Removes the scheduled event from the sys...

Страница 99: ...management and unregisters this card from the hardware management database 7 11 Freeing Resources The following code shows how the el_unattach routine frees data structures and memory that the adapter...

Страница 100: ......

Страница 101: ...orm the initialization Section 8 1 4 Releases the simple lock and resets the IPL Section 8 1 5 Returns the status from el_init_locked Section 8 1 6 8 1 1 Setting Up the el_init Routine The following c...

Страница 102: ...the Simple Lock All network device drivers must set the interrupt priority level IPL to mask all LAN hardware interrupts Raising the IPL protects the driver from interrupts on the same CPU Only networ...

Страница 103: ...easing the simple lock simple_unlock sc el_softc_lock 1 splx s 2 1 Calls the simple_unlock routine to release the simple lock 2 Calls the splx routine to reset the CPU priority to the level that is st...

Страница 104: ...the 3Com 3C5x9 device Make sure that you perform similar initialization tasks for the hardware device that your network driver controls static int el_init_locked struct el_softc sc struct ifnet ifp in...

Страница 105: ...s configuration control register The data to be written consists of the original register contents but with the enable adapter bit CCR_ENA set 2 Calls the WRITE_RCR macro to write data to the 3Com 3C5...

Страница 106: ...CR_BASE the I O base address and the ACR_10B2 Ethernet thin coaxial cable bits 3 Evaluates the value that is stored in the lm_media member of the el_softc data structure for this device 4 Determines w...

Страница 107: ...lan_set_attribute sc ehm current_val NET_MEDIA_NDX lan_media_strings sc lm_media 1 1 Sets the LAN media type attribute for EHM support 8 2 7 Selecting Memory Mapping The following code shows how the e...

Страница 108: ...ddr 5 8 sc is_addr 4 WRITE_AD3 sc i lan_set_attribute sc ehm current_val NET_MAC_NDX ether_sprintf sc is_addr 2 1 Performs several write operations to set the LAN address 2 Sets the LAN MAC address at...

Страница 109: ...and CMD_FILTER with the appropriate flags set 8 2 11 Setting the Debug Flag The following code shows how the el_init_locked routine sets the debug flag for turning on debugging on a running system Thi...

Страница 110: ...MD_ZINTMASK 0xfe WRITE_CMD sc CMD_SINTMASK S_AF S_TC S_RC else 2 WRITE_CMD sc CMD_ZINTMASK 0xfe WRITE_CMD sc CMD_SINTMASK 0 1 If the device is not polling the el_polling flag is not set calls the WRIT...

Страница 111: ...ad_wakeup_one vm_offset_t sc autosense_flag 1 If in autosense mode starts the autosense kernel thread 8 2 17 Starting the Transmit of Pending Packets The following code shows how the el_init_locked ro...

Страница 112: ......

Страница 113: ...a jacket routine that performs the following tasks Sets the IPL and obtains the simple lock Section 9 1 1 Calls the el_start_locked routine Section 9 1 2 Releases the simple lock and resets the IPL Se...

Страница 114: ...n to the caller The argument to simple_lock_try is a pointer to a simple lock data structure The if_el device driver declares the simple lock data structure by calling the decl_simple_lock_data routin...

Страница 115: ...ets Section 9 2 3 Accounts for the outgoing bytes Section 9 2 4 Updates counters frees the transmit buffer and marks the output process as active Section 9 2 5 Indicates when to start the watchdog int...

Страница 116: ...mber of the ifnet data structure for this device The memory buffer information that IF_DEQUEUE manipulates is specified in the instance of the mbuf data structure called m 4 As long as a transmit requ...

Страница 117: ...the chain of mbuf data structures in the ms mbuf pointer The m_next member stores the next memory buffer in the chain Network device drivers typically reference this member through the alternate name...

Страница 118: ...ar len ms m_len while ms NULL io_blockwrite vm_offset_t dat 2 sc data u_long len 3 HANDLE_LONGWORD dat len 3 ms ms m_next i len 4 3 if ms NULL if i val 0 for j 0 j i j val dat 8 j WRITE_DATA sc val el...

Страница 119: ...r and Marking the Output Process as Active The following code shows how the el_start_locked routine updates counters frees the transmit buffer and marks the output process as active ADD_XMIT_PACKET if...

Страница 120: ...lthough this task is optional we recommend that all network drivers perform this task ifp if_timer 3 1 1 Sets the time in seconds for starting the if_el driver s watchdog routine called el_watch After...

Страница 121: ...The watchdog section of a network device driver is an optional interface but we recommend that all network drivers have one The if_el device driver implements a watchdog routine called el_watch which...

Страница 122: ...t Timeout Counter and Resetting the Unit The following code shows how the el_watch routine counts the number of transmit timeouts clears the timer and resets the unit sc xmit_tmo 1 ifp if_timer 0 el_r...

Страница 123: ...forms the following tasks Determines whether the user removes the PCMCIA card from the slot Sets the IPL and obtains the simple lock Calls the el_reset_locked routine to reset the device Releases the...

Страница 124: ...mplementing the el_reset_locked Routine The following code shows how the el_reset_locked routine resets and restarts the hardware static void el_reset_locked struct el_softc sc struct ifnet ifp int un...

Страница 125: ...able 12 1 lists the ioctl commands that network device drivers must recognize Releases the simple lock and resets the IPL Section 12 17 Table 12 1 Network ioctl Commands ioctl Command Required Descrip...

Страница 126: ...gister unit ifp if_unit 5 struct ifreq ifr struct ifreq data 6 struct ifdevea ifd struct ifdevea data 7 struct ctrreq ctr struct ctrreq data 8 struct ifchar ifc struct ifchar data 9 int s i j need_res...

Страница 127: ...use on the device 12 2 Determining Whether the User Has Removed the PCMCIA Card from the Slot The following code shows how the el_ioctl routine determines whether the user has removed the PCMCIA card...

Страница 128: ...if_flags member of the ifnet data structure for this device 4 If the device is running calls the el_reset_locked routine to restart the network interface in loopback mode 12 5 Disabling Loopback Mode...

Страница 129: ...C address that is stored in the driver s el_softc data structure for this device to the ifd data structure 12 7 Setting the Local MAC Address SIOCSPHYSADDR ioctl Command The following code shows how t...

Страница 130: ...ink address 12 8 Adding the Device to a Multicast Group SIOCADDMULTI ioctl Command The following code shows how the el_ioctl routine implements the SIOCADDMULTI ioctl command to add a multicast addres...

Страница 131: ...to be reset 4 If the device is running and multicasts and broadcasts have not already been enabled enables them 5 Builds a text string that lists all currently active multicast addresses and sets thi...

Страница 132: ...ced hardware management EHM attribute for this network device 12 10 Accessing Network Counters SIOCRDCTRS and SIOCRDZCTRS ioctl Commands The SIOCRDCTRS ioctl command returns the values of network coun...

Страница 133: ...the various network interfaces support Table 12 2 Network Interface Counter Types Network Interface Counter Types FDDI FDDI interface statistics Status information SMT attributes MAC attributes Path a...

Страница 134: ...routine implements the SIOCSIPMTU ioctl command to set the IP MTU You must implement this task in your network driver to accommodate the IP layer case SIOCSIPMTU 1 bcopy ifr ifr_data u_char ifmtu siz...

Страница 135: ...octl command to reset the device Support for the SIOCIFRESET command is optional You can choose whether or not your driver supports it case SIOCIFRESET 1 el_reset_locked sc ifp unit 2 break 1 Determin...

Страница 136: ...IOCIFSETCHAR 2 Assumes no device reset is necessary 3 If the LAN speed passed is anything other than 10 1 means no change fails the request 4 Examines the media mode settings If the ioctl request spec...

Страница 137: ...icates that the caller has issued an invalid ioctl command 12 17 Releasing the Simple Lock and Resetting the IPL The following code shows how the el_ioctl routine releases the simple lock and resets t...

Страница 138: ......

Страница 139: ...errupt 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 dev...

Страница 140: ...rrupts 4 Calls the simple_lock routine to assert a lock with exclusive access for the resource that is associated with el_softc_lock 13 1 2 Rearming the Next Timeout The following code shows how the e...

Страница 141: ...S_RC bit the transmit complete S_TC bit or the adapter failure S_AF bit set or if the PCMCIA card is out of the slot Calls the simple_unlock routine to release the simple lock for the resource that is...

Страница 142: ...he acknowledge interrupt CMD_ACKINT and interrupt latch S_IL bits specify the data to be written 13 1 6 Transmitting Pending Frames The following code shows how the el_intr routine transmits pending f...

Страница 143: ...ines the first part of the packet Section 13 2 3 Copies the received packet into the mbuf Section 13 2 4 Discards a packet Section 13 2 5 13 2 1 Counting the Receive Interrupt and Reading the Receive...

Страница 144: ...un 0xffff sc ctrblk est_overrun if sc debug printf el d Overrun n ifp if_unit break case RX_ERT 5 case RX_EOS sc ctrblk est_recvfail_bm 4 if sc debug printf el d Bad Sized packet n ifp if_unit break c...

Страница 145: ...buf is allocated This code is an optimization In most cases a driver does not know the size of a receive packet when the buffer resource is allocated 13 2 3 Examining the First Part of the Packet The...

Страница 146: ...r to the data and calculates the number of longwords in the FIFO transfer 5 Because the EtherLink III performs no multicast filtering if the promiscuous bit and all multicast bits are not set determin...

Страница 147: ...stination address source address and ether_type fields 5 Calls the ADD_RECV_PACKET macro to increment the receive packet block count If this packet was destined for a broadcast or multicast address ca...

Страница 148: ...obtain the next value Section 13 3 4 Queues other transmits Section 13 3 5 13 3 1 Counting the Transmit Interrupt The following code shows how the el_tint routine counts the transmit interrupt define...

Страница 149: ...f_collisions 2 if sc ctrblk est_sendfail 0xffff sc ctrblk est_sendfail sc ctrblk est_sendfail_bm 1 2 WRITE_TXS sc status WRITE_CMD sc CMD_TXENA else 1 Increments the output errors because the excessiv...

Страница 150: ...gs IFF_OACTIVE 13 4 Implementing the el_error Routine The if_el driver s el_error routine implements the interface adapter error routine as follows static void el_error struct el_softc sc struct ifnet...

Страница 151: ...etc sysconfigtab database when the driver is installed The startup procedure and the sysconfig utility use the information that the etc sysconfigtab database provides to locate the driver module and...

Страница 152: ......

Страница 153: ...itting 9 6 bus specific information 3 7 initializing 5 8 C carrier checking for transmits 5 23 cfg_subsys_attr_t data structure 4 2 command port register definitions 2 2 common information el_softc da...

Страница 154: ...utine 13 12 el_init_locked routine 8 3 calling in el_init 8 3 returning status from 8 3 el_intr routine 13 1 el_ioctl routine SIOCADDMULTI ioctl command 12 6 SIOCDELMULTI ioctl command 12 7 SIOCDISABL...

Страница 155: ...device driver 1 5 F FIFO maintenance information 3 7 flag processing special 8 8 setting debug 8 9 using currently set 12 10 forward declarations if_el device driver 1 5 frames transmitting pending 13...

Страница 156: ...l_watch 10 2 setting in el_init 8 2 in el_intr 13 2 in el_ioctl 12 3 in el_start 9 1 in el_watch 10 1 ISA bus initializing bus specific data structure 5 8 probing 5 4 K kernel thread blocking 5 19 set...

Страница 157: ...8 11 packet filter attaching 6 8 packet transmit loop entering 5 20 PCI_Option entry sysconfigtab file fragment 14 1 PCMCIA bus discarding all transmits 9 3 initializing bus specific data structure 5...

Страница 158: ...ng 3 10 SIOCADDMULTI ioctl command 12 6 SIOCDELMULTI ioctl command 12 7 SIOCDISABLBACK ioctl command 12 4 SIOCENABLBACK ioctl command 12 4 SIOCIFRESET ioctl command 12 11 SIOCIFSETCHAR ioctl command 1...

Страница 159: ...smitter resetting 8 4 8 7 TX and RX enabling 8 9 U unattach interface 7 1 unit resetting 10 2 V VBA_Option entry sysconfigtab file fragment 14 1 W w3_eeprom data structure 2 13 in el_softc data struct...

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