netdev - Re: [PATCH net-next 01/14] bnxt_en: Suppress all error messages in hwrm_do_send

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Date:   Sun, 25 Aug 2019 22:15:07 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     michael.chan@...adcom.com
Cc:     netdev@...r.kernel.org, vasundhara-v.volam@...adcom.com,
        jiri@...lanox.com, ray.jui@...adcom.com
Subject: Re: [PATCH net-next 01/14] bnxt_en: Suppress all error messages in
 hwrm_do_send_msg() in silent mode.

From: Michael Chan <michael.chan@...adcom.com>
Date: Sun, 25 Aug 2019 23:54:52 -0400

> If the silent parameter is set, suppress all messages when there is
> no response from firmware.  When polling for firmware to come out of
> reset, no response may be normal and we want to suppress the error
> messages.  Also, don't poll for the firmware DMA response if Bus Master
> is disabled.  This is in preparation for error recovery when firmware
> may be in error or reset state or Bus Master is disabled.
> 
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>

The function bnxt_hwrm_do_send_msg() seems to be an interesting mix of return
values, what are the semantics?

It seems to use 0 for success, some error codes, and -1.  Does -1 have special
meaning?

Just curious, and really this unorthodox return value semantic should
be documented into a comment above the function.