Eric Lee / smarc-fsl-linux-kernel

25 Jan, 2011

1 commit

21 Jan, 2011

1 commit

  • 9190b3b32   net_sched: accurate bytes/packets stats/rates ... Browse Code »

    In commit 44b8288308ac9d (net_sched: pfifo_head_drop problem), we fixed
    a problem with pfifo_head drops that incorrectly decreased
    sch->bstats.bytes and sch->bstats.packets

    Several qdiscs (CHOKe, SFQ, pfifo_head, ...) are able to drop a
    previously enqueued packet, and bstats cannot be changed, so
    bstats/rates are not accurate (over estimated)

    This patch changes the qdisc_bstats updates to be done at dequeue() time
    instead of enqueue() time. bstats counters no longer account for dropped
    frames, and rates are more correct, since enqueue() bursts dont have
    effect on dequeue() rate.

    Signed-off-by: Eric Dumazet
    Acked-by: Stephen Hemminger
    Signed-off-by: David S. Miller

    Eric Dumazet
     

20 Jan, 2011

1 commit

11 Jan, 2011

1 commit

  • bfe0d0298   net_sched: factorize qdisc stats handling ... Browse Code »

    HTB takes into account skb is segmented in stats updates.
    Generalize this to all schedulers.

    They should use qdisc_bstats_update() helper instead of manipulating
    bstats.bytes and bstats.packets

    Add bstats_update() helper too for classes that use
    gnet_stats_basic_packed fields.

    Note : Right now, TCQ_F_CAN_BYPASS shortcurt can be taken only if no
    stab is setup on qdisc.

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

    Eric Dumazet
     

21 Oct, 2010

1 commit

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
     

20 Nov, 2008

1 commit

14 Nov, 2008

1 commit

  • f30ab418a   pkt_sched: Remove qdisc->ops->requeue() etc. ... Browse Code »

    After implementing qdisc->ops->peek() and changing sch_netem into
    classless qdisc there are no more qdisc->ops->requeue() users. This
    patch removes this method with its wrappers (qdisc_requeue()), and
    also unused qdisc->requeue structure. There are a few minor fixes of
    warnings (htb_enqueue()) and comments btw.

    The idea to kill ->requeue() and a similar patch were first developed
    by David S. Miller.

    Signed-off-by: Jarek Poplawski
    Signed-off-by: David S. Miller

    Jarek Poplawski
     

31 Oct, 2008

1 commit

21 Sep, 2008

1 commit

05 Aug, 2008

2 commits

  • c27f339af   net_sched: Add qdisc __NET_XMIT_BYPASS flag ... Browse Code »

    Patrick McHardy noticed that it would be nice to
    handle NET_XMIT_BYPASS by NET_XMIT_SUCCESS with an internal qdisc flag
    __NET_XMIT_BYPASS and to remove the mapping from dev_queue_xmit().

    David Miller spotted a serious bug in the first
    version of this patch.

    Signed-off-by: Jarek Poplawski
    Signed-off-by: David S. Miller

    Jarek Poplawski
     
  • 378a2f090   net_sched: Add qdisc __NET_XMIT_STOLEN flag ... Browse Code »

    Patrick McHardy noticed:
    "The other problem that affects all qdiscs supporting actions is
    TC_ACT_QUEUED/TC_ACT_STOLEN getting mapped to NET_XMIT_SUCCESS
    even though the packet is not queued, corrupting upper qdiscs'
    qlen counters."

    and later explained:
    "The reason why it translates it at all seems to be to not increase
    the drops counter. Within a single qdisc this could be avoided by
    other means easily, upper qdiscs would still increase the counter
    when we return anything besides NET_XMIT_SUCCESS though.

    This means we need a new NET_XMIT return value to indicate this to
    the upper qdiscs. So I'd suggest to introduce NET_XMIT_STOLEN,
    return that to upper qdiscs and translate it to NET_XMIT_SUCCESS
    in dev_queue_xmit, similar to NET_XMIT_BYPASS."

    David Miller noticed:
    "Maybe these NET_XMIT_* values being passed around should be a set of
    bits. They could be composed of base meanings, combined with specific
    attributes.

    So you could say "NET_XMIT_DROP | __NET_XMIT_NO_DROP_COUNT"

    The attributes get masked out by the top-level ->enqueue() caller,
    such that the base meanings are the only thing that make their
    way up into the stack. If it's only about communication within the
    qdisc tree, let's simply code it that way."

    This patch is trying to realize these ideas.

    Signed-off-by: Jarek Poplawski
    Signed-off-by: David S. Miller

    Jarek Poplawski
     

20 Jul, 2008

2 commits

09 Jul, 2008

2 commits

  • 5ce2d488f   pkt_sched: Remove 'dev' member of struct Qdisc. ... Browse Code »

    It can be obtained via the netdev_queue. So create a helper routine,
    qdisc_dev(), to make the transformations nicer looking.

    Now, qdisc_alloc() now no longer needs a net_device pointer argument.

    Signed-off-by: David S. Miller

    David S. Miller
     
  • bb949fbd1   netdev: Create netdev_queue abstraction. ... Browse Code »

    A netdev_queue is an entity managed by a qdisc.

    Currently there is one RX and one TX queue, and a netdev_queue merely
    contains a backpointer to the net_device.

    The Qdisc struct is augmented with a netdev_queue pointer as well.

    Eventually the 'dev' Qdisc member will go away and we will have the
    resulting hierarchy:

    net_device --> netdev_queue --> Qdisc

    Also, qdisc_alloc() and qdisc_create_dflt() now take a netdev_queue
    pointer argument.

    Signed-off-by: David S. Miller

    David S. Miller
     

02 Jul, 2008

1 commit

04 Jun, 2008

1 commit

  • bc3ed28ca   netlink: Improve returned error codes ... Browse Code »

    Make nlmsg_trim(), nlmsg_cancel(), genlmsg_cancel(), and
    nla_nest_cancel() void functions.

    Return -EMSGSIZE instead of -1 if the provided message buffer is not
    big enough.

    Signed-off-by: Thomas Graf
    Signed-off-by: David S. Miller

    Thomas Graf
     

29 Jan, 2008

8 commits

15 Jul, 2007

2 commits

11 Jul, 2007

1 commit

26 Apr, 2007

4 commits

11 Feb, 2007

1 commit

03 Dec, 2006

3 commits

01 Jul, 2006

1 commit

21 Mar, 2006

1 commit

19 Jun, 2005

1 commit