cxgb4: Add support to enable logging of firmware mailbox commands
Add new /sys/kernel/debug/ support to dump a firmware mailbox command issued and replies for debugging purpose. Based on original work by Casey Leedom <leedom@chelsio.com> Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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