Eric Lee / smarc-fsl-linux-kernel

13 Jan, 2012

1 commit

  • cf778b00e   net: reintroduce missing rcu_assign_pointer() calls ... Browse Code »

    commit a9b3cd7f32 (rcu: convert uses of rcu_assign_pointer(x, NULL) to
    RCU_INIT_POINTER) did a lot of incorrect changes, since it did a
    complete conversion of rcu_assign_pointer(x, y) to RCU_INIT_POINTER(x,
    y).

    We miss needed barriers, even on x86, when y is not NULL.

    Signed-off-by: Eric Dumazet
    CC: Stephen Hemminger
    CC: Paul E. McKenney
    Signed-off-by: David S. Miller

    Eric Dumazet
     

08 Aug, 2011

2 commits

02 Aug, 2011

1 commit

  • a9b3cd7f3   rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER ... Browse Code »

    When assigning a NULL value to an RCU protected pointer, no barrier
    is needed. The rcu_assign_pointer, used to handle that but will soon
    change to not handle the special case.

    Convert all rcu_assign_pointer of NULL value.

    //smpl
    @@ expression P; @@

    - rcu_assign_pointer(P, NULL)
    + RCU_INIT_POINTER(P, NULL)

    //

    Signed-off-by: Stephen Hemminger
    Acked-by: Paul E. McKenney
    Signed-off-by: David S. Miller

    Stephen Hemminger
     

31 Mar, 2011

1 commit

18 Jan, 2011

4 commits

  • 94b27cc36   netfilter: allow NFQUEUE bypass if no listener is available ... Browse Code »

    If an skb is to be NF_QUEUE'd, but no program has opened the queue, the
    packet is dropped.

    This adds a v2 target revision of xt_NFQUEUE that allows packets to
    continue through the ruleset instead.

    Because the actual queueing happens outside of the target context, the
    'bypass' flag has to be communicated back to the netfilter core.

    Unfortunately the only choice to do this without adding a new function
    argument is to use the target function return value (i.e. the verdict).

    In the NF_QUEUE case, the upper 16bit already contain the queue number
    to use. The previous patch reduced NF_VERDICT_MASK to 0xff, i.e.
    we now have extra room for a new flag.

    If a hook issued a NF_QUEUE verdict, then the netfilter core will
    continue packet processing if the queueing hook
    returns -ESRCH (== "this queue does not exist") and the new
    NF_VERDICT_FLAG_QUEUE_BYPASS flag is set in the verdict value.

    Note: If the queue exists, but userspace does not consume packets fast
    enough, the skb will still be dropped.

    Signed-off-by: Florian Westphal
    Signed-off-by: Patrick McHardy

    Florian Westphal
     
  • f615df76e   netfilter: reduce NF_VERDICT_MASK to 0xff ... Browse Code »

    NF_VERDICT_MASK is currently 0xffff. This is because the upper
    16 bits are used to store errno (for NF_DROP) or the queue number
    (NF_QUEUE verdict).

    As there are up to 0xffff different queues available, there is no more
    room to store additional flags.

    At the moment there are only 6 different verdicts, i.e. we can reduce
    NF_VERDICT_MASK to 0xff to allow storing additional flags in the 0xff00 space.

    NF_VERDICT_BITS would then be reduced to 8, but because the value is
    exported to userspace, this might cause breakage; e.g.:

    e.g. 'queuenr = (1 << NF_VERDICT_BITS) | NF_QUEUE' would now break.

    Thus, remove NF_VERDICT_BITS usage in the kernel and move the old value
    to the 'userspace compat' section.

    Signed-off-by: Florian Westphal
    Signed-off-by: Patrick McHardy

    Florian Westphal
     
  • 06cdb6349   netfilter: nfnetlink_queue: do not free skb on error ... Browse Code »

    Move free responsibility from nf_queue to caller.
    This enables more flexible error handling; we can now accept the skb
    instead of freeing it.

    Signed-off-by: Florian Westphal
    Signed-off-by: Patrick McHardy

    Florian Westphal
     
  • f15850861   netfilter: nfnetlink_queue: return error number to caller ... Browse Code »

    instead of returning -1 on error, return an error number to allow the
    caller to handle some errors differently.

    ECANCELED is used to indicate that the hook is going away and should be
    ignored.

    A followup patch will introduce more 'ignore this hook' conditions,
    (depending on queue settings) and will move kfree_skb responsibility
    to the caller.

    Signed-off-by: Florian Westphal
    Signed-off-by: Patrick McHardy

    Florian Westphal
     

16 Nov, 2010

1 commit

20 Aug, 2010

1 commit

18 May, 2010

1 commit

  • 7fee226ad   net: add a noref bit on skb dst ... Browse Code »

    Use low order bit of skb->_skb_dst to tell dst is not refcounted.

    Change _skb_dst to _skb_refdst to make sure all uses are catched.

    skb_dst() returns the dst, regardless of noref bit set or not, but
    with a lockdep check to make sure a noref dst is not given if current
    user is not rcu protected.

    New skb_dst_set_noref() helper to set an notrefcounted dst on a skb.
    (with lockdep check)

    skb_dst_drop() drops a reference only if skb dst was refcounted.

    skb_dst_force() helper is used to force a refcount on dst, when skb
    is queued and not anymore RCU protected.

    Use skb_dst_force() in __sk_add_backlog(), __dev_xmit_skb() if
    !IFF_XMIT_DST_RELEASE or skb enqueued on qdisc queue, in
    sock_queue_rcv_skb(), in __nf_queue().

    Use skb_dst_force() in dev_requeue_skb().

    Note: dst_use_noref() still dirties dst, we might transform it
    later to do one dirtying per jiffies.

    Signed-off-by: Eric Dumazet
    Signed-off-by: David S. Miller

    Eric Dumazet
     

13 May, 2010

1 commit

  • 736d58e3a   netfilter: remove unnecessary returns from void function()s ... Browse Code »

    This patch removes from net/ netfilter files
    all the unnecessary return; statements that precede the
    last closing brace of void functions.

    It does not remove the returns that are immediately
    preceded by a label as gcc doesn't like that.

    Done via:
    $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
    xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

    Signed-off-by: Joe Perches
    [Patrick: changed to keep return statements in otherwise empty function bodies]
    Signed-off-by: Patrick McHardy

    Joe Perches
     

30 Mar, 2010

1 commit

  • 5a0e3ad6a   include cleanup: Update gfp.h and slab.h includes to prepare for breaking implic… ... Browse Code »

    …it slab.h inclusion from percpu.h

    percpu.h is included by sched.h and module.h and thus ends up being
    included when building most .c files. percpu.h includes slab.h which
    in turn includes gfp.h making everything defined by the two files
    universally available and complicating inclusion dependencies.

    percpu.h -> slab.h dependency is about to be removed. Prepare for
    this change by updating users of gfp and slab facilities include those
    headers directly instead of assuming availability. As this conversion
    needs to touch large number of source files, the following script is
    used as the basis of conversion.

    http://userweb.kernel.org/~tj/misc/slabh-sweep.py

    The script does the followings.

    * Scan files for gfp and slab usages and update includes such that
    only the necessary includes are there. ie. if only gfp is used,
    gfp.h, if slab is used, slab.h.

    * When the script inserts a new include, it looks at the include
    blocks and try to put the new include such that its order conforms
    to its surrounding. It's put in the include block which contains
    core kernel includes, in the same order that the rest are ordered -
    alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
    doesn't seem to be any matching order.

    * If the script can't find a place to put a new include (mostly
    because the file doesn't have fitting include block), it prints out
    an error message indicating which .h file needs to be added to the
    file.

    The conversion was done in the following steps.

    1. The initial automatic conversion of all .c files updated slightly
    over 4000 files, deleting around 700 includes and adding ~480 gfp.h
    and ~3000 slab.h inclusions. The script emitted errors for ~400
    files.

    2. Each error was manually checked. Some didn't need the inclusion,
    some needed manual addition while adding it to implementation .h or
    embedding .c file was more appropriate for others. This step added
    inclusions to around 150 files.

    3. The script was run again and the output was compared to the edits
    from #2 to make sure no file was left behind.

    4. Several build tests were done and a couple of problems were fixed.
    e.g. lib/decompress_*.c used malloc/free() wrappers around slab
    APIs requiring slab.h to be added manually.

    5. The script was run on all .h files but without automatically
    editing them as sprinkling gfp.h and slab.h inclusions around .h
    files could easily lead to inclusion dependency hell. Most gfp.h
    inclusion directives were ignored as stuff from gfp.h was usually
    wildly available and often used in preprocessor macros. Each
    slab.h inclusion directive was examined and added manually as
    necessary.

    6. percpu.h was updated not to include slab.h.

    7. Build test were done on the following configurations and failures
    were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
    distributed build env didn't work with gcov compiles) and a few
    more options had to be turned off depending on archs to make things
    build (like ipr on powerpc/64 which failed due to missing writeq).

    * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
    * powerpc and powerpc64 SMP allmodconfig
    * sparc and sparc64 SMP allmodconfig
    * ia64 SMP allmodconfig
    * s390 SMP allmodconfig
    * alpha SMP allmodconfig
    * um on x86_64 SMP allmodconfig

    8. percpu.h modifications were reverted so that it could be applied as
    a separate patch and serve as bisection point.

    Given the fact that I had only a couple of failures from tests on step
    6, I'm fairly confident about the coverage of this conversion patch.
    If there is a breakage, it's likely to be something in one of the arch
    headers which should be easily discoverable easily on most builds of
    the specific arch.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>

    Tejun Heo
     

19 Feb, 2010

1 commit

  • 64507fdbc   netfilter: nf_queue: fix NF_STOLEN skb leak ... Browse Code »

    commit 3bc38712e3a6e059 (handle NF_STOP and unknown verdicts in
    nf_reinject) was a partial fix to packet leaks.

    If user asks NF_STOLEN status, we must free the skb as well.

    Reported-by: Afi Gjermund
    Signed-off-by: Eric DUmazet
    Signed-off-by: Patrick McHardy

    Eric Dumazet
     

08 May, 2009

1 commit

08 Oct, 2008

2 commits

29 Apr, 2008

1 commit

  • 801678c5a   Remove duplicated unlikely() in IS_ERR() ... Browse Code »

    Some drivers have duplicated unlikely() macros. IS_ERR() already has
    unlikely() in itself.

    This patch cleans up such pointless code.

    Signed-off-by: Hirofumi Nakagawa
    Acked-by: David S. Miller
    Acked-by: Jeff Garzik
    Cc: Paul Clements
    Cc: Richard Purdie
    Cc: Alessandro Zummo
    Cc: David Brownell
    Cc: James Bottomley
    Cc: Michael Halcrow
    Cc: Anton Altaparmakov
    Cc: Al Viro
    Cc: Carsten Otte
    Cc: Patrick McHardy
    Cc: Paul Mundt
    Cc: Jaroslav Kysela
    Cc: Takashi Iwai
    Acked-by: Mike Frysinger
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Hirofumi Nakagawa
     

28 Mar, 2008

1 commit

11 Mar, 2008

1 commit

  • 94be1a3f3   [NETFILTER]: nf_queue: don't return error when unregistering a non-existant handler ... Browse Code »

    Commit ce7663d84:

    [NETFILTER]: nfnetlink_queue: don't unregister handler of other subsystem

    changed nf_unregister_queue_handler to return an error when attempting to
    unregister a queue handler that is not identical to the one passed in.
    This is correct in case we really do have a different queue handler already
    registered, but some existing userspace code always does an unbind before
    bind and aborts if that fails, so try to be nice and return success in
    that case.

    Signed-off-by: Patrick McHardy
    Signed-off-by: David S. Miller

    Patrick McHardy
     

29 Jan, 2008

9 commits

16 Oct, 2007

1 commit

11 Jul, 2007

3 commits

13 Feb, 2007

2 commits

23 Sep, 2006

1 commit

25 Jul, 2006

1 commit

01 Jul, 2006

1 commit

10 Apr, 2006

1 commit