netdev - Re: [PATCH net-next 2/8] virtio_net: mergeable xdp: introduce mergeable_xdp

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Date:   Wed, 22 Mar 2023 21:52:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        <virtualization@...ts.linux-foundation.org>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/8] virtio_net: mergeable xdp: introduce
 mergeable_xdp_prepare

On Thu, 23 Mar 2023 12:45:41 +0800 Yunsheng Lin wrote:
> >> Also, it seems better to split the xdp_linearize_page() to two functions
> >> as pskb_expand_head() and __skb_linearize() do, one to expand the headroom,
> >> the other one to do the linearizing.  
> > 
> > No skb here.  
> 
> I means following the semantics of pskb_expand_head() and __skb_linearize(),
> not to combine the headroom expanding and linearizing into one function as
> xdp_linearize_page() does now if we want a better refoctor result.

It's a driver-local function, if I was reading the code and saw
xdp_prepare_mergeable() I'd have thought it's a function from XDP core.
If anything the functions are missing local driver prefix. But it's
not a huge deal (given Michael's ping yesterday asking us if we can
expedite merging..)