1. 10 Dec, 2018 1 commit
  2. 05 Oct, 2018 1 commit
    • Cong Wang's avatar
      net_sched: convert idrinfo->lock from spinlock to a mutex · 95278dda
      Cong Wang authored
      In commit ec3ed293 ("net_sched: change tcf_del_walker() to take idrinfo->lock")
      we move fl_hw_destroy_tmplt() to a workqueue to avoid blocking
      with the spinlock held. Unfortunately, this causes a lot of
      troubles here:
      
      1. tcf_chain_destroy() could be called right after we queue the work
         but before the work runs. This is a use-after-free.
      
      2. The chain refcnt is already 0, we can't even just hold it again.
         We can check refcnt==1 but it is ugly.
      
      3. The chain with refcnt 0 is still visible in its block, which means
         it could be still found and used!
      
      4. The block has a refcnt too, we can't hold it without introducing a
         proper API either.
      
      We can make it working but the end result is ugly. Instead of wasting
      time on reviewing it, let's just convert the troubling spinlock to
      a mutex, which allows us to use non-atomic allocations too.
      
      Fixes: ec3ed293 ("net_sched: change tcf_del_walker() to take idrinfo->lock")
      Reported-by: default avatarIdo Schimmel <idosch@idosch.org>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: Vlad Buslov <vladbu@mellanox.com>
      Cc: Jiri Pirko <jiri@mellanox.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Tested-by: default avatarIdo Schimmel <idosch@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      95278dda
  3. 24 Sep, 2018 1 commit
  4. 01 Sep, 2018 1 commit
  5. 21 Aug, 2018 4 commits
  6. 11 Aug, 2018 1 commit
  7. 30 Jul, 2018 1 commit
    • Paolo Abeni's avatar
      tc/act: remove unneeded RCU lock in action callback · 7fd4b288
      Paolo Abeni authored
      Each lockless action currently does its own RCU locking in ->act().
      This allows using plain RCU accessor, even if the context
      is really RCU BH.
      
      This change drops the per action RCU lock, replace the accessors
      with the _bh variant, cleans up a bit the surrounding code and
      documents the RCU status in the relevant header.
      No functional nor performance change is intended.
      
      The goal of this patch is clarifying that the RCU critical section
      used by the tc actions extends up to the classifier's caller.
      
      v1 -> v2:
       - preserve rcu lock in act_bpf: it's needed by eBPF helpers,
         as pointed out by Daniel
      
      v3 -> v4:
       - fixed some typos in the commit message (JiriP)
      Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
      Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7fd4b288
  8. 08 Jul, 2018 7 commits
  9. 26 Jun, 2018 1 commit
  10. 24 Mar, 2018 1 commit
  11. 09 Mar, 2018 2 commits
  12. 16 Feb, 2018 9 commits
  13. 13 Dec, 2017 1 commit
  14. 05 Dec, 2017 1 commit
  15. 09 Nov, 2017 1 commit
  16. 03 Nov, 2017 2 commits
  17. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      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 <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  18. 12 Oct, 2017 2 commits
  19. 13 Sep, 2017 1 commit
    • Cong Wang's avatar
      net_sched: get rid of tcfa_rcu · d7fb60b9
      Cong Wang authored
      gen estimator has been rewritten in commit 1c0d32fd
      ("net_sched: gen_estimator: complete rewrite of rate estimators"),
      the caller is no longer needed to wait for a grace period.
      So this patch gets rid of it.
      
      This also completely closes a race condition between action free
      path and filter chain add/remove path for the following patch.
      Because otherwise the nested RCU callback can't be caught by
      rcu_barrier().
      
      Please see also the comments in code.
      
      Cc: Jiri Pirko <jiri@mellanox.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: Eric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d7fb60b9
  20. 30 Aug, 2017 1 commit