Doug / smarc-fsl-linux-kernel

11 Sep, 2012

1 commit

  • 15e473046   netlink: Rename pid to portid to avoid confusion ... Browse Code »

    It is a frequent mistake to confuse the netlink port identifier with a
    process identifier. Try to reduce this confusion by renaming fields
    that hold port identifiers portid instead of pid.

    I have carefully avoided changing the structures exported to
    userspace to avoid changing the userspace API.

    I have successfully built an allyesconfig kernel with this change.

    Signed-off-by: "Eric W. Biederman"
    Acked-by: Stephen Hemminger
    Signed-off-by: David S. Miller

    Eric W. Biederman
     

10 Aug, 2012

1 commit

  • 1fb9489bf   net: Loopback ifindex is constant now ... Browse Code »

    As pointed out, there are places, that access net->loopback_dev->ifindex
    and after ifindex generation is made per-net this value becomes constant
    equals 1. So go ahead and introduce the LOOPBACK_IFINDEX constant and use
    it where appropriate.

    Signed-off-by: Pavel Emelyanov
    Acked-by: Eric Dumazet
    Signed-off-by: David S. Miller

    Pavel Emelyanov
     

24 Jul, 2012

1 commit

21 Jul, 2012

1 commit

17 Jul, 2012

1 commit

  • 6700c2709   net: Pass optional SKB and SK arguments to dst_ops->{update_pmtu,redirect}() ... Browse Code »

    This will be used so that we can compose a full flow key.

    Even though we have a route in this context, we need more. In the
    future the routes will be without destination address, source address,
    etc. keying. One ipv4 route will cover entire subnets, etc.

    In this environment we have to have a way to possess persistent storage
    for redirects and PMTU information. This persistent storage will exist
    in the FIB tables, and that's why we'll need to be able to rebuild a
    full lookup flow key here. Using that flow key will do a fib_lookup()
    and create/update the persistent entry.

    Signed-off-by: David S. Miller

    David S. Miller
     

12 Jul, 2012

1 commit

11 Jul, 2012

2 commits

05 Jul, 2012

2 commits

28 Jun, 2012

1 commit

27 Jun, 2012

1 commit

16 May, 2012

1 commit

16 Apr, 2012

1 commit

06 Feb, 2012

1 commit

06 Dec, 2011

1 commit

27 Nov, 2011

2 commits

01 Nov, 2011

1 commit

18 Jul, 2011

3 commits

02 Jul, 2011

1 commit

  • 06f8fe11b   decnet: Reduce switch/case indent ... Browse Code »

    Make the case labels the same indent as the switch.

    git diff -w shows differences for line wrapping.
    (fit multiple lines to 80 columns, join where possible)

    Signed-off-by: Joe Perches
    Signed-off-by: David S. Miller

    Joe Perches
     

10 Jun, 2011

1 commit

  • c7ac8679b   rtnetlink: Compute and store minimum ifinfo dump size ... Browse Code »

    The message size allocated for rtnl ifinfo dumps was limited to
    a single page. This is not enough for additional interface info
    available with devices that support SR-IOV and caused a bug in
    which VF info would not be displayed if more than approximately
    40 VFs were created per interface.

    Implement a new function pointer for the rtnl_register service that will
    calculate the amount of data required for the ifinfo dump and allocate
    enough data to satisfy the request.

    Signed-off-by: Greg Rose
    Signed-off-by: Jeff Kirsher

    Greg Rose
     

29 Apr, 2011

2 commits

13 Mar, 2011

2 commits

03 Mar, 2011

1 commit

02 Mar, 2011

1 commit

18 Feb, 2011

1 commit

27 Jan, 2011

1 commit

  • 62fa8a846   net: Implement read-only protection and COW'ing of metrics. ... Browse Code »

    Routing metrics are now copy-on-write.

    Initially a route entry points it's metrics at a read-only location.
    If a routing table entry exists, it will point there. Else it will
    point at the all zero metric place-holder called 'dst_default_metrics'.

    The writeability state of the metrics is stored in the low bits of the
    metrics pointer, we have two bits left to spare if we want to store
    more states.

    For the initial implementation, COW is implemented simply via kmalloc.
    However future enhancements will change this to place the writable
    metrics somewhere else, in order to increase sharing. Very likely
    this "somewhere else" will be the inetpeer cache.

    Note also that this means that metrics updates may transiently fail
    if we cannot COW the metrics successfully.

    But even by itself, this patch should decrease memory usage and
    increase cache locality especially for routing workloads. In those
    cases the read-only metric copies stay in place and never get written
    to.

    TCP workloads where metrics get updated, and those rare cases where
    PMTU triggers occur, will take a very slight performance hit. But
    that hit will be alleviated when the long-term writable metrics
    move to a more sharable location.

    Since the metrics storage went from a u32 array of RTAX_MAX entries to
    what is essentially a pointer, some retooling of the dst_entry layout
    was necessary.

    Most importantly, we need to preserve the alignment of the reference
    count so that it doesn't share cache lines with the read-mostly state,
    as per Eric Dumazet's alignment assertion checks.

    The only non-trivial bit here is the move of the 'flags' member into
    the writeable cacheline. This is OK since we are always accessing the
    flags around the same moment when we made a modification to the
    reference count.

    Signed-off-by: David S. Miller

    David S. Miller
     

15 Dec, 2010

1 commit

14 Dec, 2010

1 commit

  • 0dbaee3b3   net: Abstract default ADVMSS behind an accessor. ... Browse Code »

    Make all RTAX_ADVMSS metric accesses go through a new helper function,
    dst_metric_advmss().

    Leave the actual default metric as "zero" in the real metric slot,
    and compute the actual default value dynamically via a new dst_ops
    AF specific callback.

    For stacked IPSEC routes, we use the advmss of the path which
    preserves existing behavior.

    Unlike ipv4/ipv6, DecNET ties the advmss to the mtu and thus updates
    advmss on pmtu updates. This inconsistency in advmss handling
    results in more raw metric accesses than I wish we ended up with.

    Signed-off-by: David S. Miller

    David S. Miller
     

10 Dec, 2010

1 commit

  • defb3519a   net: Abstract away all dst_entry metrics accesses. ... Browse Code »

    Use helper functions to hide all direct accesses, especially writes,
    to dst_entry metrics values.

    This will allow us to:

    1) More easily change how the metrics are stored.

    2) Implement COW for metrics.

    In particular this will help us put metrics into the inetpeer
    cache if that is what we end up doing. We can make the _metrics
    member a pointer instead of an array, initially have it point
    at the read-only metrics in the FIB, and then on the first set
    grab an inetpeer entry and point the _metrics member there.

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

    David S. Miller
     

18 Nov, 2010

1 commit

12 Nov, 2010

1 commit

09 Nov, 2010

1 commit

  • fc766e4c4   decnet: RCU conversion and get rid of dev_base_lock ... Browse Code »

    While tracking dev_base_lock users, I found decnet used it in
    dnet_select_source(), but for a wrong purpose:

    Writers only hold RTNL, not dev_base_lock, so readers must use RCU if
    they cannot use RTNL.

    Adds an rcu_head in struct dn_ifaddr and handle proper RCU management.

    Adds __rcu annotation in dn_route as well.

    Signed-off-by: Eric Dumazet
    Acked-by: Steven Whitehouse
    Signed-off-by: David S. Miller

    Eric Dumazet
     

12 Oct, 2010

1 commit

  • fc66f95c6   net dst: use a percpu_counter to track entries ... Browse Code »

    struct dst_ops tracks number of allocated dst in an atomic_t field,
    subject to high cache line contention in stress workload.

    Switch to a percpu_counter, to reduce number of time we need to dirty a
    central location. Place it on a separate cache line to avoid dirtying
    read only fields.

    Stress test :

    (Sending 160.000.000 UDP frames,
    IP route cache disabled, dual E5540 @2.53GHz,
    32bit kernel, FIB_TRIE, SLUB/NUMA)

    Before:

    real 0m51.179s
    user 0m15.329s
    sys 10m15.942s

    After:

    real 0m45.570s
    user 0m15.525s
    sys 9m56.669s

    With a small reordering of struct neighbour fields, subject of a
    following patch, (to separate refcnt from other read mostly fields)

    real 0m41.841s
    user 0m15.261s
    sys 8m45.949s

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

    Eric Dumazet
     

11 Jun, 2010

1 commit