netdev - Re: [RFC PATCH 01/14] packet: introduce AF

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Date:   Wed, 15 Nov 2017 14:34:32 -0800
From:   chet l <loke.chetan@...il.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     magnus.karlsson@...el.com, alexander.h.duyck@...el.com,
        Alexander Duyck <alexander.duyck@...il.com>,
        John Fastabend <john.fastabend@...il.com>, ast@...com,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        michael.lundkvist@...csson.com, ravineet.singh@...csson.com,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        jesse.brandeburg@...el.com, anjali.singhai@...el.com,
        rami.rosen@...el.com, jeffrey.b.shaw@...el.com,
        ferruh.yigit@...el.com, qi.z.zhang@...el.com
Subject: Re: [RFC PATCH 01/14] packet: introduce AF_PACKET V4 userspace API

On Tue, Oct 31, 2017 at 5:41 AM, Björn Töpel <bjorn.topel@...il.com> wrote:
> From: Björn Töpel <bjorn.topel@...el.com>
>

> +/*
> + * struct tpacket_memreg_req is used in conjunction with PACKET_MEMREG
> + * to register user memory which should be used to store the packet
> + * data.
> + *
> + * There are some constraints for the memory being registered:
> + * - The memory area has to be memory page size aligned.
> + * - The frame size has to be a power of 2.
> + * - The frame size cannot be smaller than 2048B.
> + * - The frame size cannot be larger than the memory page size.
> + *
> + * Corollary: The number of frames that can be stored is
> + * len / frame_size.
> + *
> + */
> +struct tpacket_memreg_req {
> +       unsigned long   addr;           /* Start of packet data area */
> +       unsigned long   len;            /* Length of packet data area */
> +       unsigned int    frame_size;     /* Frame size */
> +       unsigned int    data_headroom;  /* Frame head room */
> +};
> +

I have not reviewed the entire patchset but I think if we could add a
version_hdr and then unionize the fields, it might be easier to add
SVM support without having to spin v5. I could be wrong though.


Chetan