# Re: \[PATCH RFC v3 2/5\] net: Add NETIF\_F\_GRO\_LIST feature

- From: Subash Abhinov Kasiviswanathan \<hidden\>
- Date: 2019-09-19 02:06:42 
- List: netdev
- Page: https://ratatoskr.run/netdev/2019/09/11147923
- Thread: https://ratatoskr.run/netdev/2019/09/11147879/t.md

```text
On 2019-09-18 10:10, Willem de Bruijn wrote:
> On Wed, Sep 18, 2019 at 3:25 AM Steffen Klassert
> [ref] wrote:
>>
>> This adds a new NETIF_F_GRO_LIST feature flag. I will be used
>> to configure listfyed GRO what will be implemented with some
>> followup paches.
>
> This should probably simultaneously introduce SKB_GSO_FRAGLIST as well
> as a BUILD_BUG_ON in net_gso_ok.
>
> Please also in the commit describe the constraints of skbs that have
> this type. If I'm not mistaken, an skb with either gso_size linear
> data or one gso_sized frag, followed by a frag_list of the same. With
> the exception of the last frag_list member, whose mss may be less than
> gso_size. This will help when reasoning about all the types of skbs we
> may see at segmentation, as we recently had to do [1]
>

Would it be preferrable to allow any size skbs for the listification.
Since the original skbs are being restored, single gso_size shoudln't
be a constraint here.

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```