netdev - RE: [PATCH net-next 1/3] cxgb4: Add support for loopback between VI of same port

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Date:	Fri, 22 May 2015 16:49:03 +0000
From:	Casey Leedom <leedom@...lsio.com>
To:	David Miller <davem@...emloft.net>
CC:	Hariprasad S <hariprasad@...lsio.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Nirranjan Kirubaharan <nirranjan@...lsio.com>
Subject: RE: [PATCH net-next 1/3] cxgb4: Add support for loopback between VI
 of same port

| From: David Miller [davem@...emloft.net]
| Sent: Thursday, May 21, 2015 12:30 PM
| 
| The prevailing assumption is that it's OK to have configuration
| settings that can't be undone.
| 
| And that's bogus from the beginning.

  Oh I definitely understand that and agree.  Unfortunately I've
inherited a driver architecture that makes that ... "difficult"
for many operations ...  And I have an internal bug filed
against me to fix those particular issues.

  However, that doesn't answer at least one of my questions
which was how do I pass information into the driver _before_
it does the device probe?  In this case, telling it to _not_
attempt to attached to the chip firmware in order to debug,
load firmware, etc.?

  And, I still need to know what mechanism we need to use
to tell the driver to use one kind of transmit functionality
or another.  [[And in this case, we _can_ switch back and
forth at will.]]

Casey--
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