Eric Lee / smarc-fsl-linux-kernel

04 Mar, 2020

1 commit

19 Jun, 2019

1 commit

  • 32c28f7e4   page_pool: add tracepoints for page_pool with details need by XDP ... Browse Code »

    The xdp tracepoints for mem id disconnect don't carry information about, why
    it was not safe_to_remove. The tracepoint page_pool:page_pool_inflight in
    this patch can be used for extract this info for further debugging.

    This patchset also adds tracepoint for the pages_state_* release/hold
    transitions, including a pointer to the page. This can be used for stats
    about in-flight pages, or used to debug page leakage via keeping track of
    page pointer and combining this with kprobe for __put_page().

    Signed-off-by: Jesper Dangaard Brouer
    Signed-off-by: David S. Miller

    Jesper Dangaard Brouer
     

18 Feb, 2019

1 commit

25 May, 2018

1 commit

04 Nov, 2017

1 commit

02 Nov, 2017

1 commit

  • b24413180   License cleanup: add SPDX GPL-2.0 license identifier to files with no license ... Browse Code »

    Many source files in the tree are missing licensing information, which
    makes it harder for compliance tools to determine the correct license.

    By default all files without license information are under the default
    license of the kernel, which is GPL version 2.

    Update the files which contain no license information with the 'GPL-2.0'
    SPDX license identifier. The SPDX identifier is a legally binding
    shorthand, which can be used instead of the full boiler plate text.

    This patch is based on work done by Thomas Gleixner and Kate Stewart and
    Philippe Ombredanne.

    How this work was done:

    Patches were generated and checked against linux-4.14-rc6 for a subset of
    the use cases:
    - file had no licensing information it it.
    - file was a */uapi/* one with no licensing information in it,
    - file was a */uapi/* one with existing licensing information,

    Further patches will be generated in subsequent months to fix up cases
    where non-standard license headers were used, and references to license
    had to be inferred by heuristics based on keywords.

    The analysis to determine which SPDX License Identifier to be applied to
    a file was done in a spreadsheet of side by side results from of the
    output of two independent scanners (ScanCode & Windriver) producing SPDX
    tag:value files created by Philippe Ombredanne. Philippe prepared the
    base worksheet, and did an initial spot review of a few 1000 files.

    The 4.13 kernel was the starting point of the analysis with 60,537 files
    assessed. Kate Stewart did a file by file comparison of the scanner
    results in the spreadsheet to determine which SPDX license identifier(s)
    to be applied to the file. She confirmed any determination that was not
    immediately clear with lawyers working with the Linux Foundation.

    Criteria used to select files for SPDX license identifier tagging was:
    - Files considered eligible had to be source code files.
    - Make and config files were included as candidates if they contained >5
    lines of source
    - File already had some variant of a license header in it (even if
    Reviewed-by: Philippe Ombredanne
    Reviewed-by: Thomas Gleixner
    Signed-off-by: Greg Kroah-Hartman

    Greg Kroah-Hartman
     

24 Oct, 2017

1 commit

15 Oct, 2017

1 commit

  • e086101b1   tcp: add a tracepoint for tcp retransmission ... Browse Code »

    We need a real-time notification for tcp retransmission
    for monitoring.

    Of course we could use ftrace to dynamically instrument this
    kernel function too, however we can't retrieve the connection
    information at the same time, for example perf-tools [1] reads
    /proc/net/tcp for socket details, which is slow when we have
    a lots of connections.

    Therefore, this patch adds a tracepoint for __tcp_retransmit_skb()
    and exposes src/dst IP addresses and ports of the connection.
    This also makes it easier to integrate into perf.

    Note, I expose both IPv4 and IPv6 addresses at the same time:
    for a IPv4 socket, v4 mapped address is used as IPv6 addresses,
    for a IPv6 socket, LOOPBACK4_IPV6 is already filled by kernel.
    Also, add sk and skb pointers as they are useful for BPF.

    1. https://github.com/brendangregg/perf-tools/blob/master/net/tcpretrans

    Cc: Eric Dumazet
    Cc: Alexei Starovoitov
    Cc: Hannes Frederic Sowa
    Cc: Brendan Gregg
    Cc: Neal Cardwell
    Signed-off-by: Cong Wang
    Acked-by: Alexei Starovoitov
    Acked-by: Brendan Gregg
    Signed-off-by: David S. Miller

    Cong Wang
     

01 Sep, 2017

1 commit

  • e3cfddd57   bridge: add tracepoint in br_fdb_update ... Browse Code »

    This extends bridge fdb table tracepoints to also cover
    learned fdb entries in the br_fdb_update path. Note that
    unlike other tracepoints I have moved this to when the fdb
    is modified because this is in the datapath and can generate
    a lot of noise in the trace output. br_fdb_update is also called
    from added_by_user context in the NTF_USE case which is already
    traced ..hence the !added_by_user check.

    Signed-off-by: Roopa Prabhu
    Acked-by: Nikolay Aleksandrov
    Signed-off-by: David S. Miller

    Roopa Prabhu
     

30 Aug, 2017

1 commit

17 Aug, 2017

1 commit

  • e543002f7   qdisc: add tracepoint qdisc:qdisc_dequeue for dequeued SKBs ... Browse Code »

    The main purpose of this tracepoint is to monitor bulk dequeue
    in the network qdisc layer, as it cannot be deducted from the
    existing qdisc stats.

    The txq_state can be used for determining the reason for zero packet
    dequeues, see enum netdev_queue_state_t.

    Notice all packets doesn't necessary activate this tracepoint. As
    qdiscs with flag TCQ_F_CAN_BYPASS, can directly invoke
    sch_direct_xmit() when qdisc_qlen is zero.

    Remember that perf record supports filters like:

    perf record -e qdisc:qdisc_dequeue \
    --filter 'ifindex == 4 && (packets > 1 || txq_state > 0)'

    Signed-off-by: Jesper Dangaard Brouer
    Signed-off-by: David S. Miller

    Jesper Dangaard Brouer
     

23 Nov, 2015

1 commit

30 Aug, 2015

1 commit

01 Nov, 2011

1 commit

22 Jun, 2011

2 commits

  • 3847ce32a   core: add tracepoints for queueing skb to rcvbuf ... Browse Code »

    This patch adds 2 tracepoints to get a status of a socket receive queue
    and related parameter.

    One tracepoint is added to sock_queue_rcv_skb. It records rcvbuf size
    and its usage. The other tracepoint is added to __sk_mem_schedule and
    it records limitations of memory for sockets and current usage.

    By using these tracepoints we're able to know detailed reason why kernel
    drop the packet.

    Signed-off-by: Satoru Moriya
    Acked-by: Neil Horman
    Signed-off-by: David S. Miller

    Satoru Moriya
     
  • 296f7ea75   udp: add tracepoints for queueing skb to rcvbuf ... Browse Code »

    This patch adds a tracepoint to __udp_queue_rcv_skb to get the
    return value of ip_queue_rcv_skb. It indicates why kernel drops
    a packet at this point.

    ip_queue_rcv_skb returns following values in the packet drop case:

    rcvbuf is full : -ENOMEM
    sk_filter returns error : -EINVAL, -EACCESS, -ENOMEM, etc.
    __sk_mem_schedule returns error: -ENOBUF

    Signed-off-by: Satoru Moriya
    Acked-by: Neil Horman
    Signed-off-by: David S. Miller

    Satoru Moriya
     

07 Sep, 2010

1 commit

  • cf66ba58b   netdev: Add tracepoints to netdev layer ... Browse Code »

    This patch adds tracepoint to dev_queue_xmit, dev_hard_start_xmit,
    netif_rx and netif_receive_skb. These tracepoints help you to monitor
    network driver's input/output.

    -0 [001] 112447.902030: netif_rx: dev=eth1 skbaddr=f3ef0900 len=84
    -0 [001] 112447.902039: netif_receive_skb: dev=eth1 skbaddr=f3ef0900 len=84
    sshd-6828 [000] 112447.903257: net_dev_queue: dev=eth4 skbaddr=f3fca538 len=226
    sshd-6828 [000] 112447.903260: net_dev_xmit: dev=eth4 skbaddr=f3fca538 len=226 rc=0

    Signed-off-by: Koki Sanagi
    Acked-by: David S. Miller
    Acked-by: Neil Horman
    Cc: Mathieu Desnoyers
    Cc: Kaneshige Kenji
    Cc: Izumo Taku
    Cc: Kosaki Motohiro
    Cc: Lai Jiangshan
    Cc: Scott Mcmillan
    Cc: Steven Rostedt
    Cc: Eric Dumazet
    LKML-Reference:
    Signed-off-by: Frederic Weisbecker

    Koki Sanagi
     

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
     

15 Jun, 2009

1 commit

22 May, 2009

1 commit

  • 4ea7e3869   dropmon: add ability to detect when hardware dropsrxpackets ... Browse Code »

    Patch to add the ability to detect drops in hardware interfaces via dropwatch.
    Adds a tracepoint to net_rx_action to signal everytime a napi instance is
    polled. The dropmon code then periodically checks to see if the rx_frames
    counter has changed, and if so, adds a drop notification to the netlink
    protocol, using the reserved all-0's vector to indicate the drop location was in
    hardware, rather than somewhere in the code.

    Signed-off-by: Neil Horman

    include/linux/net_dropmon.h | 8 ++
    include/trace/napi.h | 11 +++
    net/core/dev.c | 5 +
    net/core/drop_monitor.c | 124 ++++++++++++++++++++++++++++++++++++++++++--
    net/core/net-traces.c | 4 +
    net/core/netpoll.c | 2
    6 files changed, 149 insertions(+), 5 deletions(-)
    Signed-off-by: David S. Miller

    Neil Horman
     

15 Apr, 2009

2 commits

  • ad8d75fff   tracing/events: move trace point headers into include/trace/events ... Browse Code »

    Impact: clean up

    Create a sub directory in include/trace called events to keep the
    trace point headers in their own separate directory. Only headers that
    declare trace points should be defined in this directory.

    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Neil Horman
    Cc: Zhao Lei
    Cc: Eduard - Gabriel Munteanu
    Cc: Pekka Enberg
    Signed-off-by: Steven Rostedt

    Steven Rostedt
     
  • a8d154b00   tracing: create automated trace defines ... Browse Code »

    This patch lowers the number of places a developer must modify to add
    new tracepoints. The current method to add a new tracepoint
    into an existing system is to write the trace point macro in the
    trace header with one of the macros TRACE_EVENT, TRACE_FORMAT or
    DECLARE_TRACE, then they must add the same named item into the C file
    with the macro DEFINE_TRACE(name) and then add the trace point.

    This change cuts out the needing to add the DEFINE_TRACE(name).
    Every file that uses the tracepoint must still include the trace/.h
    file, but the one C file must also add a define before the including
    of that file.

    #define CREATE_TRACE_POINTS
    #include

    This will cause the trace/mytrace.h file to also produce the C code
    necessary to implement the trace point.

    Note, if more than one trace/.h is used to create the C code
    it is best to list them all together.

    #define CREATE_TRACE_POINTS
    #include
    #include
    #include

    Thanks to Mathieu Desnoyers and Christoph Hellwig for coming up with
    the cleaner solution of the define above the includes over my first
    design to have the C code include a "special" header.

    This patch converts sched, irq and lockdep and skb to use this new
    method.

    Cc: Peter Zijlstra
    Cc: Thomas Gleixner
    Cc: Neil Horman
    Cc: Zhao Lei
    Cc: Eduard - Gabriel Munteanu
    Cc: Pekka Enberg
    Signed-off-by: Steven Rostedt

    Steven Rostedt
     

14 Mar, 2009

1 commit