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  1. 27 Apr, 2012 3 commits
    • hartleys's avatar
      crush: include header for global symbols · feb50ac1
      hartleys authored 
      Include the header to pickup the definitions of the global symbols.

Quiets the following sparse warnings:

warning: symbol 'crush_find_rule' was not declared. Should it be static?
warning: symbol 'crush_do_rule' was not declared. Should it be static?
Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Sage Weil <sage@newdream.net>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      feb50ac1
    • hartleys's avatar
      isdn/eicon: use standard __init,__exit function markup · d7398892
      hartleys authored 
      Remove the custom DIVA_{INIT,EXIT}_FUNCTION defines and use
the standard __init,__exit markup.
Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Armin Schindler <mac@melware.de>
Cc: Karsten Keil <isdn@linux-pingi.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d7398892
    • Eric Dumazet's avatar
      ipv6: RTAX_FEATURE_ALLFRAG causes inefficient TCP segment sizing · 67469601
      Eric Dumazet authored 
      Quoting Tore Anderson from :
https://bugzilla.kernel.org/show_bug.cgi?id=42572

When RTAX_FEATURE_ALLFRAG is set on a route, the effective TCP segment
size does not take into account the size of the IPv6 Fragmentation
header that needs to be included in outbound packets, causing every
transmitted TCP segment to be fragmented across two IPv6 packets, the
latter of which will only contain 8 bytes of actual payload.

RTAX_FEATURE_ALLFRAG is typically set on a route in response to
receving a ICMPv6 Packet Too Big message indicating a Path MTU of less
than 1280 bytes. 1280 bytes is the minimum IPv6 MTU, however ICMPv6
PTBs with MTU < 1280 are still valid, in particular when an IPv6
packet is sent to an IPv4 destination through a stateless translator.
Any ICMPv4 Need To Fragment packets originated from the IPv4 part of
the path will be translated to ICMPv6 PTB which may then indicate an
MTU of less than 1280.

The Linux kernel refuses to reduce the effective MTU to anything below
1280 bytes, instead it sets it to exactly 1280 bytes, and
RTAX_FEATURE_ALLFRAG is also set. However, the TCP segment size appears
to be set to 1240 bytes (1280 Path MTU - 40 bytes of IPv6 header),
instead of 1232 (additionally taking into account the 8 bytes required
by the IPv6 Fragmentation extension header).

This in turn results in rather inefficient transmission, as every
transmitted TCP segment now is split in two fragments containing
1232+8 bytes of payload.

After this patch, all the outgoing packets that includes a
Fragmentation header all are "atomic" or "non-fragmented" fragments,
i.e., they both have Offset=0 and More Fragments=0.

With help from David S. Miller
Reported-by: default avatarTore Anderson <tore@fud.no>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Tom Herbert <therbert@google.com>
Tested-by: default avatarTore Anderson <tore@fud.no>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      67469601
  3. 26 Apr, 2012 31 commits
  5. 25 Apr, 2012 1 commit
  7. 24 Apr, 2012 5 commits
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