1. 02 Nov, 2017 24 commits
  2. 01 Nov, 2017 2 commits
  3. 29 Oct, 2017 14 commits
    • Linus Torvalds's avatar
      Linux 4.14-rc7 · 0b07194b
      Linus Torvalds authored
      0b07194b
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 19e12196
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix route leak in xfrm_bundle_create().
      
       2) In mac80211, validate user rate mask before configuring it. From
          Johannes Berg.
      
       3) Properly enforce memory limits in fair queueing code, from Toke
          Hoiland-Jorgensen.
      
       4) Fix lockdep splat in inet_csk_route_req(), from Eric Dumazet.
      
       5) Fix TSO header allocation and management in mvpp2 driver, from Yan
          Markman.
      
       6) Don't take socket lock in BH handler in strparser code, from Tom
          Herbert.
      
       7) Don't show sockets from other namespaces in AF_UNIX code, from
          Andrei Vagin.
      
       8) Fix double free in error path of tap_open(), from Girish Moodalbail.
      
       9) Fix TX map failure path in igb and ixgbe, from Jean-Philippe Brucker
          and Alexander Duyck.
      
      10) Fix DCB mode programming in stmmac driver, from Jose Abreu.
      
      11) Fix err_count handling in various tunnels (ipip, ip6_gre). From Xin
          Long.
      
      12) Properly align SKB head before building SKB in tuntap, from Jason
          Wang.
      
      13) Avoid matching qdiscs with a zero handle during lookups, from Cong
          Wang.
      
      14) Fix various endianness bugs in sctp, from Xin Long.
      
      15) Fix tc filter callback races and add selftests which trigger the
          problem, from Cong Wang.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (73 commits)
        selftests: Introduce a new test case to tc testsuite
        selftests: Introduce a new script to generate tc batch file
        net_sched: fix call_rcu() race on act_sample module removal
        net_sched: add rtnl assertion to tcf_exts_destroy()
        net_sched: use tcf_queue_work() in tcindex filter
        net_sched: use tcf_queue_work() in rsvp filter
        net_sched: use tcf_queue_work() in route filter
        net_sched: use tcf_queue_work() in u32 filter
        net_sched: use tcf_queue_work() in matchall filter
        net_sched: use tcf_queue_work() in fw filter
        net_sched: use tcf_queue_work() in flower filter
        net_sched: use tcf_queue_work() in flow filter
        net_sched: use tcf_queue_work() in cgroup filter
        net_sched: use tcf_queue_work() in bpf filter
        net_sched: use tcf_queue_work() in basic filter
        net_sched: introduce a workqueue for RCU callbacks of tc filter
        sctp: fix some type cast warnings introduced since very beginning
        sctp: fix a type cast warnings that causes a_rwnd gets the wrong value
        sctp: fix some type cast warnings introduced by transport rhashtable
        sctp: fix some type cast warnings introduced by stream reconf
        ...
      19e12196
    • David S. Miller's avatar
      Merge branch 'net_sched-fix-races-with-RCU-callbacks' · 6c325f4e
      David S. Miller authored
      Cong Wang says:
      
      ====================
      net_sched: fix races with RCU callbacks
      
      Recently, the RCU callbacks used in TC filters and TC actions keep
      drawing my attention, they introduce at least 4 race condition bugs:
      
      1. A simple one fixed by Daniel:
      
      commit c78e1746
      Author: Daniel Borkmann <daniel@iogearbox.net>
      Date:   Wed May 20 17:13:33 2015 +0200
      
          net: sched: fix call_rcu() race on classifier module unloads
      
      2. A very nasty one fixed by me:
      
      commit 1697c4bb
      Author: Cong Wang <xiyou.wangcong@gmail.com>
      Date:   Mon Sep 11 16:33:32 2017 -0700
      
          net_sched: carefully handle tcf_block_put()
      
      3. Two more bugs found by Chris:
      https://patchwork.ozlabs.org/patch/826696/
      https://patchwork.ozlabs.org/patch/826695/
      
      Usually RCU callbacks are simple, however for TC filters and actions,
      they are complex because at least TC actions could be destroyed
      together with the TC filter in one callback. And RCU callbacks are
      invoked in BH context, without locking they are parallel too. All of
      these contribute to the cause of these nasty bugs.
      
      Alternatively, we could also:
      
      a) Introduce a spinlock to serialize these RCU callbacks. But as I
      said in commit 1697c4bb
      
       ("net_sched: carefully handle
      tcf_block_put()"), it is very hard to do because of tcf_chain_dump().
      Potentially we need to do a lot of work to make it possible (if not
      impossible).
      
      b) Just get rid of these RCU callbacks, because they are not
      necessary at all, callers of these call_rcu() are all on slow paths
      and holding RTNL lock, so blocking is allowed in their contexts.
      However, David and Eric dislike adding synchronize_rcu() here.
      
      As suggested by Paul, we could defer the work to a workqueue and
      gain the permission of holding RTNL again without any performance
      impact, however, in tcf_block_put() we could have a deadlock when
      flushing workqueue while hodling RTNL lock, the trick here is to
      defer the work itself in workqueue and make it queued after all
      other works so that we keep the same ordering to avoid any
      use-after-free. Please see the first patch for details.
      
      Patch 1 introduces the infrastructure, patch 2~12 move each
      tc filter to the new tc filter workqueue, patch 13 adds
      an assertion to catch potential bugs like this, patch 14
      closes another rcu callback race, patch 15 and patch 16 add
      new test cases.
      ====================
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6c325f4e
    • Chris Mi's avatar
      selftests: Introduce a new test case to tc testsuite · 31c2611b
      Chris Mi authored
      
      
      In this patchset, we fixed a tc bug. This patch adds the test case
      that reproduces the bug. To run this test case, user should specify
      an existing NIC device:
        # sudo ./tdc.py -d enp4s0f0
      
      This test case belongs to category "flower". If user doesn't specify
      a NIC device, the test cases belong to "flower" will not be run.
      
      In this test case, we create 1M filters and all filters share the same
      action. When destroying all filters, kernel should not panic. It takes
      about 18s to run it.
      Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
      Acked-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Signed-off-by: default avatarChris Mi <chrism@mellanox.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      31c2611b
    • Chris Mi's avatar
      selftests: Introduce a new script to generate tc batch file · 7f071998
      Chris Mi authored
      
      
        # ./tdc_batch.py -h
        usage: tdc_batch.py [-h] [-n NUMBER] [-o] [-s] [-p] device file
      
        TC batch file generator
      
        positional arguments:
          device                device name
          file                  batch file name
      
        optional arguments:
          -h, --help            show this help message and exit
          -n NUMBER, --number NUMBER
                                how many lines in batch file
          -o, --skip_sw         skip_sw (offload), by default skip_hw
          -s, --share_action    all filters share the same action
          -p, --prio            all filters have different prio
      Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
      Acked-by: default avatarLucas Bates <lucasb@mojatatu.com>
      Signed-off-by: default avatarChris Mi <chrism@mellanox.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7f071998
    • Cong Wang's avatar
      net_sched: fix call_rcu() race on act_sample module removal · 46e235c1
      Cong Wang authored
      Similar to commit c78e1746
      
      
      ("net: sched: fix call_rcu() race on classifier module unloads"),
      we need to wait for flying RCU callback tcf_sample_cleanup_rcu().
      
      Cc: Yotam Gigi <yotamg@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      46e235c1
    • Cong Wang's avatar
      net_sched: add rtnl assertion to tcf_exts_destroy() · 2d132eba
      Cong Wang authored
      
      
      After previous patches, it is now safe to claim that
      tcf_exts_destroy() is always called with RTNL lock.
      
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2d132eba
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in tcindex filter · 27ce4f05
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      27ce4f05
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in rsvp filter · d4f84a41
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d4f84a41
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in route filter · c2f3f31d
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c2f3f31d
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in u32 filter · c0d378ef
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c0d378ef
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in matchall filter · df2735ee
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      df2735ee
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in fw filter · e071dff2
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e071dff2
    • Cong Wang's avatar
      net_sched: use tcf_queue_work() in flower filter · 0552c8af
      Cong Wang authored
      
      
      Defer the tcf_exts_destroy() in RCU callback to
      tc filter workqueue and get RTNL lock.
      Reported-by: default avatarChris Mi <chrism@mellanox.com>
      Cc: Daniel Borkmann <daniel@iogearbox.net>
      Cc: Jiri Pirko <jiri@resnulli.us>
      Cc: John Fastabend <john.fastabend@gmail.com>
      Cc: Jamal Hadi Salim <jhs@mojatatu.com>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0552c8af