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IXP1200 Network Processor Family ATM OC-3/12/Ethernet IP Router Example Design
Application Note 47
Modified on: 3/20/02,
• On hardware, counters.c is compiled into the atm_utils.o VxWorks-loadable module to
provide counters at the VxWorks console.
4.8.1 Global Parameters
4.8.2 Use of the Counter Subsystem
In this design, system_config.h controls the counter subsystem and defines a handle for each
counter. This handle provides the parameters to counter_inc() in the microcode. For example,
counter_inc(ATM_RX_CELL_DROP_VC_CLOSED) is invoked in ATM Receive threads every
time a cell is discarded because it arrived on a VC that is not open.
#define ATM_RX_CELL_DROP_VC_CLOSED COUNTERS_BASE, 5, COUNT_CELL_DROP
The counter handle has three members:
• The base address of the counter array.
• The index of the counter in the array.
• The flags to determine at compile-time if the counter should be invoked.
4.8.2.1 Counter Base Address
The base address of the counter array is defined so that it starts immediately after the per-port
exception counters defined in mem_map.h, and it is used as the first member of every counter
handle. (This is why the counter example in “counters_print()”starts at (decimal) scratchpad
location 195.)
#define COUNTERS_BASE 0xc3
4.8.2.2 Counter Index
The index of the counter is simply entered directly into the list of counter handle definitions. Be
careful not to duplicate any counter indexes, because it would cause multiple handles to increment
the same location.
Parameter Description
COUNTERS_BASE Base address of the scratchpad counter array (mandatory)
COUNTER_LOCATIONS Size of the counter array (optional). Default is 64
COUNTER_STRINGn
String to print for counter n, where n is from 0 until
COUNTER_LOCATIONS -1 (optional). Default is "Counter n"