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Re: [PATCH] Ethernet Bridging: Enable Hardware Checksumming

To: niv@xxxxxxxxxx
Subject: Re: [PATCH] Ethernet Bridging: Enable Hardware Checksumming
From: "David S. Miller" <davem@xxxxxxxxxxxxx>
Date: Thu, 19 May 2005 11:51:41 -0700 (PDT)
Cc: herbert@xxxxxxxxxxxxxxxxxxx, jdmason@xxxxxxxxxx, shemminger@xxxxxxxx, netdev@xxxxxxxxxxx
In-reply-to: <428CAC55.4000202@xxxxxxxxxx>
References: <E1DYayB-0005Sk-00@xxxxxxxxxxxxxxxxxxxxxxxx> <428CAC55.4000202@xxxxxxxxxx>
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From: Nivedita Singhvi <niv@xxxxxxxxxx>
Date: Thu, 19 May 2005 08:10:13 -0700

> Fair point - though I would argue that devices that
> support SG are much more common now - so optimizing
> for the more common case might be preferable - since
> people using bridging with devices that support
> checksum offload are taking quite a hit when they
> do bridging - perhaps this could be a conditional?

I disagree.  Many low costs devices are non-SG still,
there is no reason to penalize them explicitly.

I think instead we should look at ways to propagate
the hardware device features to the bridge.  Even if
a bridge is composed of multiple devices, we just
advertise the subset of features actually supported.

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