if_bnxt/bnxt_re: add support for driver snapdump

Add a logging module which helps to log and collect the driver`s
various events and state of device data structures.
APIs help modules like l2, RoCE etc. to register and
add logs into thg buffers. A segment header is added to the
data available in buffers.

The final log messages are arranged in following fashion

|SegHeader0|Data0|SegHeader1|Data1|
Logging module provides two different kinds of buffers:
a) A large contiguous memory chunk is used to form circular buffers.

Module need to provide a number of buffers while registering to
the logging module.Please note that, since memory for the
buffers remains with the module as long as it is registered, memory
footprints of the driver could be higher so the modules should
allocate an appropriate number of buffers. Also, due to limited
space, modules should only log important events/messages into
the buffer.
Modules  must use bnxt_log_add_mssg() to add the message into the
list.
b) Live buffer - They are allocated during coredump retrieval and

freed after the coredump data is returned to the user. This helps
to collect live data from the driver. Modules must use the
bnxt_log_live() function to add the log messages.
When coredump is retrieved all the messages available in above buffers are
copied into the coredump buffer.

Test Plan:
Generate the coredump using below niccli command
./niccli.freebsd -i 1 debug --coredump

and then verify the coredump contents using the Broadcom's Coredump decoder.

MFC after:      2 weeks
Reviewed by:    gallatin, ssaxena
Differential Revision: https://reviews.freebsd.org/D56682

0 files changed, 0 insertions, 0 deletions