netdev - Re: [PATCH 1/5] send-crc: Add framework to allow sending packets with customized CRC.

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Message-ID: <CAHXqBFKe+nAGk8gjjOxRSbgtPSPHXcz3_fNjaBaxh48vPvDysQ@mail.gmail.com>
Date:	Tue, 7 Feb 2012 21:33:29 +0100
From:	Michał Mirosław <mirqus@...il.com>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/5] send-crc: Add framework to allow sending packets with
 customized CRC.

2012/2/7  <greearb@...delatech.com>:
> From: Ben Greear <greearb@...delatech.com>
>
> This is useful for testing RX handling of frames with bad
> CRCs.
>
> Requires driver support to actually put the packet on the
> wire properly.
[...]

I like this idea. I think that this is not a feature to have in
dev->features to toggle, though. Driver either supports this or not,
so it's better to put it in dev->priv_flags instead. Disabling of FCS
inserting is a per-packet option in the drivers, isn't it?

For one problem with toggling: if you create a socket using it and
later turn off the feature, the socket will still send skbs with FCS
appended.

Best Regards,
Michał Mirosław
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