sfc: add tracing of MCDI commands
MCDI tracing is conditional on CONFIG_SFC_MCDI_LOGGING, which is enabled by default. Each MCDI command will produce a console line like sfc dom:bus:dev:fn ifname: MCDI RPC REQ: xxxxxxxx [yyyyyyyy...] where xxxxxxxx etc. are the raw MCDI payload in 32-bit hex chunks. The response will then produce a similar line with "RESP" instead of "REQ", and containing the MCDI response payload (if any). Signed-off-by: Edward Cree <ecree@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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