netdev - Re: [PATCH v2 net-next af-packet 1/2] Enhance af-packet to provide (near zero)lossless packet capture functionality.

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Message-ID: <CAAsGZS67G8H5NLBxQTY88+T1cRQ3aiwBXK5qa8SJ_TbQ7xqvhw@mail.gmail.com>
Date:	Wed, 6 Jul 2011 17:45:20 -0400
From:	chetan loke <loke.chetan@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com, joe@...ches.com,
	bhutchings@...arflare.com, shemminger@...tta.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next af-packet 1/2] Enhance af-packet to provide
 (near zero)lossless packet capture functionality.

On Tue, Jul 5, 2011 at 11:01 AM, David Miller <davem@...emloft.net> wrote:

>
> That issue only exists because you haven't defined a common header
> struct that the current, and all future, block descriptor variants can
> include at the start of their definitions.

what's common today may not be common tomorrow. After much thinking I
decided to not provide a generic header because I wouldn't want to
enforce anything.

new format:

union bd_header_u {
       /* renamed struct bd_v1 to hdr_v1 */
       struct hdr_v1 h1;
} __attribute__ ((__packed__));

struct block_desc {
       __u16 version;
       __u16 offset_to_priv;
       union bd_header_u hdr;
} __attribute__ ((__packed__));

Is this ok with you?


>
> Use real data structures, not opaque "offset+size" poking into the
> descriptors.
>
Used to writing firmware APIs. APIs use words/bytes so that they can
be interpreted by firmware folks too.

Chetan Loke
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