netdev - RE: [PATCH net-next 05/10] bnxt_en: Fix ethtool -l|-L inconsistent channel counts.

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Date:   Mon, 19 Sep 2016 09:21:51 +0000
From:   "Mintz, Yuval" <Yuval.Mintz@...ium.com>
To:     Michael Chan <michael.chan@...adcom.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 05/10] bnxt_en: Fix ethtool -l|-L inconsistent
 channel counts.

> >> The existing code is inconsistent in reporting and accepting the
> >> combined channel count.  bnxt_get_channels() reports maximum combined
> >> as the maximum rx count.  bnxt_set_channels() accepts combined count
> >> that cannot be bigger than max rx or max tx.
> >>
> >> For example, if max rx = 2 and max tx = 1, we report max supported
> >> combined to be 2.  But if the user tries to set combined to 2, it
> >> will fail because 2 is bigger than max tx which is 1.
> >>
> >> Fix the code to be consistent.  Max allowed combined = max(max_rx,
> max_tx).
> >> We will accept a combined channel count <= max(max_rx, max_tx).
> >
> > Don't you mean the 'max allowed combined = min(max_rx, max_tx)'.
> > How does using 'max' change the faulty scenario you've described?
> 
> I'm fixing the inconsistency described in the first 2 paragraphs.  The driver logic
> allows a combined ring to be rx or tx only.  In the above example, we allow
> combined to be set to 2.  The 2nd combined ring supports rx only.

Then what makes it a combined channel?
Sounds to me like in the above scenario you should have claimed support for:
  - max rx == 2
  - max tx == 1
  - max combined == 1