Advanced Communications Controller B.03.32.00 Release Notes

Patches and Fixes for this Version

Chapter 1 21

• JAGad98715

Symptoms: Panic with Data Page Fault with the following stack trace:

panic+0x6c

report_trap_or_int_and_panic+0x94

interrupt+0x208

$ihndlr_rtn+0x0

nacc1_cmplt_read+0x38

nacc2_complete_req+0x34a8

nacc2_end_io+0x580

nacc2_isr+0x126c

sapic_interrupt+0x2c

...

Defect/Fix: When stressing the system by running the tests on 16 cards simultaneously

on a HP rp8400 server, we see the above panic. The panic is because, in

nacc1_cmplt_read, the DMA receive queue is found to be NULL. Dereferencing this

NULL pointer caused the above sustem panic. The fix is to check if qhead is NULL. If it is

NULL, we log a trace message and return.

• JAGad67070

Symptoms: System panics with the Spinlock timeout failure.

Defect/Fix: The Spinlock timeout failure seems to be happening because the function

N2z_Disable_ZLUs() calls the zcntl() holding the SPINLOCK(glock). Because there are no

buffers available, the Zc_gosleep() is eventually called which in turn calls sleep(). This is

causing the spinlock timeout failure to occur because the spinlock should not be held when

the sleep() is called. To fix this, the spinlock is released before calling the zcntl() in

function N2z_Disable_ZLUs().

• JAGae04681

Symptoms: This is an enhancement to diagnostic capabilities of the ACC Firmware.

Tracing the ACC firmware to determine events leading up to and causes of problems has

been difficult to do without specialized equipment. A better ACC firmware tracing

mechanism was needed.

Defect/Fix: A more advanced ACC firmware tracing environment was developed to enable

on-demand, and dynamic tracing of the ACC firmware, without the need for

extra equipment, such as a logic analyzer. This environment also enabled the amount of

trace points within the firmware code to be substantially increased - since the new

mechanism has a very low impact on the ACC card's performance. The new trace

mechanism allows the amount of active tracing to be varied and tracing of individual

modules and protocols be selectively enabled and disabled dynamically. The mechanism

allows tracing to be captured from a running ACC card.