Re: ib_ipoib: CSUM support in connected mode

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On Tue, Sep 16, 2014 at 09:47:43AM +0300, Or Gerlitz wrote:
> 
> On the post you wrote "[...] resolve the issue by removing the physically contiguous memory requirement using Scatter/Gather feature that exists in Linux".
> 
> I assume you refer to NETIF_F_SG, right? so your claim is that Linux will not effectively use the driver ability to serve SG skbs unless the driver also advertizes (say) NETIF_F_IP_CSUM?!
Or,
Correct me if i'm wrong here but i didn't saw any handling of fragmented skb in driver.
The current implementation dma map only skb->data where in fragmented skb there is a need to dma map all frags, right?
> 
> I thought it's the other way around -- that is supporting checksum offloading is useless unless SG is supported. Can you provide pointer into the network stack code/documentation that supports your claim?
> Or.
> 
> 
> 
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