er...@vger.kernel.org; jasow...@redhat.com
> Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> From: KY Srinivasan
> Date: Thu, 17 Sep 2015 19:52:01 +
>
> >
> >
> >> -Original Message-
> >> Have a pre-cooked ring
From: KY Srinivasan
Date: Thu, 17 Sep 2015 19:52:01 +
>
>
>> -Original Message-
>> Have a pre-cooked ring of buffers for these descriptors that you can
>> point the chip at. No per-packet allocation is necessary at all.
>
> Even if I had a ring of buffers, I would still need to ma
l.org;
> linux-ker...@vger.kernel.org; jasow...@redhat.com
> Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> From: KY Srinivasan
> Date: Thu, 17 Sep 2015 15:14:05 +
>
> > I think I can achieve my original goal of not having any allocation
> > in the s
From: KY Srinivasan
Date: Thu, 17 Sep 2015 15:14:05 +
> I think I can achieve my original goal of not having any allocation
> in the send path by carefully using the memory available in the skb:
Please stop flat-out ignoring David L.'s suggestion.
Have a pre-cooked ring of buffers for these
nel.org;
> Jason Wang
> Subject: RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> From: KY Srinivasan
> > Sent: 16 September 2015 23:58
> ...
> > > I think we get that. The question is does the Remote NDIS header and
> > > packet
David Miller writes:
> From: David Laight
> Date: Wed, 16 Sep 2015 16:25:03 +
>
>> Am I right in thinking this is adding an extra 96 unused bytes to the front
>> of almost all skb just so that hyper-v can make its link level header
>> contiguous with whatever follows (IP header ?).
>>
>> Do
From: KY Srinivasan
> Sent: 16 September 2015 23:58
...
> > I think we get that. The question is does the Remote NDIS header and
> > packet info actually need to be a part of the header data? I would
> > argue that it probably doesn't.
> >
> > So for example in netvsc_start_xmit it looks like you
r.kernel.org;
> Jason Wang
> Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> On 09/16/2015 10:55 AM, KY Srinivasan wrote:
> >
> >> -Original Message-
> >> From: David Laight [mailto:david.lai...@aculab.com]
> >>
r.kernel.org;
> Jason Wang
> Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> On 09/16/2015 03:57 PM, KY Srinivasan wrote:
> >
> >> -Original Message-
> >> From: Alexander Duyck [mailto:alexander.du...@gmail.com]
> >>
-ker...@vger.kernel.org;
Jason Wang
Subject: Re: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
On 09/16/2015 10:55 AM, KY Srinivasan wrote:
-Original Message-
From: David Laight [mailto:david.lai...@aculab.com]
Sent: Wednesday, September 16, 2015 9:25 AM
To: Haiyang Zhang
Srinivasan ; Jason Wang
Subject: RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-
V
From: Haiyang Zhang
Sent: 16 September 2015 17:09
-Original Message-
From: Vitaly Kuznetsov [mailto:vkuzn...@redhat.com]
Sent: Wednesday, September 16, 2015 11:50 AM
To: netdev@vger.kernel.org
Cc
From: David Laight
Date: Wed, 16 Sep 2015 16:25:03 +
> Am I right in thinking this is adding an extra 96 unused bytes to the front
> of almost all skb just so that hyper-v can make its link level header
> contiguous with whatever follows (IP header ?).
>
> Doesn't sound ideal.
Agreed, this
n Wang
> Subject: RE: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-
> V
>
> From: Haiyang Zhang
> > Sent: 16 September 2015 17:09
> > > -Original Message-
> > > From: Vitaly Kuznetsov [mailto:vkuzn...@redhat.com]
> > > Sent: Wedne
...@vger.kernel.org;
KY Srinivasan ; Haiyang Zhang
; Jason Wang
Subject: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
Commit b08cc79155fc26d0d112b1470d1ece5034651a4b ("hv_netvsc: Eliminate
memory allocation in the packet send path") introduced skb headroom
request for Hyper-V net
ger.kernel.org;
> > KY Srinivasan ; Haiyang Zhang
> > ; Jason Wang
> > Subject: [PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
> >
> > Commit b08cc79155fc26d0d112b1470d1ece5034651a4b ("hv_netvsc: Eliminate
> > memory allocation in the packet
[PATCH net-next RFC] net: increase LL_MAX_HEADER for Hyper-V
>
> Commit b08cc79155fc26d0d112b1470d1ece5034651a4b ("hv_netvsc: Eliminate
> memory allocation in the packet send path") introduced skb headroom
> request for Hyper-V netvsc driver:
>
>
Commit b08cc79155fc26d0d112b1470d1ece5034651a4b ("hv_netvsc: Eliminate
memory allocation in the packet send path") introduced skb headroom
request for Hyper-V netvsc driver:
max_needed_headroom = sizeof(struct hv_netvsc_packet) +
sizeof(struct rndis_message)
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