netdev - [PATCH net-next v5 0/2] af-packet: Enhance af-packet to provide a flexible mmap ring buffer scheme.

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Message-Id: <1313785096-911-1-git-send-email-loke.chetan@gmail.com>
Date:	Fri, 19 Aug 2011 16:18:14 -0400
From:	Chetan Loke <loke.chetan@...il.com>
To:	netdev@...r.kernel.org, davem@...emloft.net
Cc:	Chetan Loke <loke.chetan@...il.com>
Subject: [PATCH net-next v5 0/2] af-packet: Enhance af-packet to provide a flexible mmap ring buffer scheme.

Changes in v5:
1) Provide accurate patch description.			(Dave Miller)
   Tightened up patch descriptions.
2) Replace indirect calls with inline tests.		(Dave Miller)
3) Use distinct subject-line per patch.			(Dave Miller)

Changes in v4:
1) Used ALIGN macro                                     (Joe Perches)
2) Deleted duplicate field                              (Eric Dumazet)
3) Re-aligned tpacket fields for disk-capture

Changes in v3:
1) Stripped __packed__ attribute.                       (Dave Miller)
   Replaced with aligned_u64 and padding.
2) Added 'feature_request_word'.
3) Added rx_hash field to the v3-header.                (Chetan L)

Changes in v2:

1) Aligned bdqc members, pr_err to WARN, sob email      (Joe Perches)
2) Added tp_padding                                     (Eric Dumazet)
3) Nuked useless ;) white space                         (Stephen H)
4) Use __u types in headers                             (Ben Hutchings)
5) Added field for creating private area                (Chetan Loke)

Enhanced af-packet to provide a flexible mmap ring buffer scheme by:
A) eliminating fixed frame-size requirement.
B) providing block-level read/poll.

Benefits:
  B1) ~15-20% reduction in cpu-usage.
  B2) ~20% increase in packet capture rate.
  B3) ~2x  increase in packet density(higher capture visibility).
  B4) Capture entire packet payload.
  B5) Captures 99% 64-byte traffic as seen by the kernel.

Detailed description of the enhancement-need/test-setup/etc can be viewed at:
http://thread.gmane.org/gmane.linux.kernel/1158216

Test-suite:
git://lolpcap.git.sourceforge.net/gitroot/lolpcap/lolpcap

----------------------------------------

 include/linux/if_packet.h |  119 ++++++
 net/packet/af_packet.c    |  937 ++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 1010 insertions(+), 46 deletions(-)

-- 
1.7.5.2

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