From: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: ib_ipoib: CSUM support in connected mode
Date: Thu, 2 Oct 2014 16:00:46 +0300 [thread overview]
Message-ID: <20141002130045.GA3592@yuval-lab> (raw)
In-Reply-To: <5417DD0F.9090201-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
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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next prev parent reply other threads:[~2014-10-02 13:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-14 18:46 ib_ipoib: CSUM support in connected mode Yuval Shaia
2014-09-15 14:47 ` Or Gerlitz
[not found] ` <CAJ3xEMhEzdyzcAufQU--VbM7aoAzsw7wV2i_i=kjcS9PbdC0Tw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-15 16:58 ` Jason Gunthorpe
[not found] ` <20140915165820.GB12397-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2014-09-15 17:20 ` Or Gerlitz
[not found] ` <CAJ3xEMir_FgqS7j+fuhugocawdZXHG9hAK-jpArZ_5vkzVjZeg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-15 17:45 ` Jason Gunthorpe
2014-09-15 19:03 ` Yuval Shaia
2014-09-15 18:55 ` Yuval Shaia
2014-09-16 6:47 ` Or Gerlitz
[not found] ` <5417DD0F.9090201-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-09-22 19:28 ` Yuval Shaia
2014-09-30 8:39 ` Yuval Shaia
2014-10-02 13:00 ` Yuval Shaia [this message]
2014-10-01 11:55 ` Yuval Shaia
2014-10-01 12:13 ` Or Gerlitz
[not found] ` <542BEFED.6050203-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-04 18:36 ` Yuval Shaia
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