netdev - Re: [PATCH bpf-next v4 0/2] libbpf: adding AF

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Date:   Mon, 11 Feb 2019 07:33:33 +0100
From:   Jean-Mickael Guerin <jmg@...nd.com>
To:     Magnus Karlsson <magnus.karlsson@...el.com>
Cc:     bjorn.topel@...el.com, ast@...nel.org, daniel@...earbox.net,
        netdev@...r.kernel.org, jakub.kicinski@...ronome.com,
        bjorn.topel@...il.com, qi.z.zhang@...el.com, brouer@...hat.com,
        xiaolong.ye@...el.com
Subject: Re: [PATCH bpf-next v4 0/2] libbpf: adding AF_XDP support

Hi Magnus,

> * In a future release, I am planning on adding a higher level data
>   plane interface too. This will be based around recvmsg and sendmsg
>   with the use of struct iovec for batching, without the user having
>   to know anything about the underlying four rings of an AF_XDP
>   socket. There will be one semantic difference though from the
>   standard recvmsg and that is that the kernel will fill in the iovecs
>   instead of the application. But the rest should be the same as the
>   libc versions so that application writers feel at home.

You might consider recvmmsg() and sendmmsg() (bulk of multi segments packets?)

Jean-Mickael