1. 29 Mar, 2015 1 commit
    • Toshiaki Makita's avatar
      vlan: Add features for stacked vlan device · 8d463504
      Toshiaki Makita authored
      Stacked vlan devices curretly have few features (GRO, HIGHDMA, LLTX).
      Since we have software fallbacks in case the NIC can not handle some
      features for multiple vlans, we can add the same features as the lower
      vlan devices for stacked vlan devices.
      
      This allows stacked vlan devices to create large (GSO) packets and not to
      segment packets. Those packets will be segmented by software on the real
      device, or even can be segmented by the NIC once TSO for multiple vlans
      becomes enabled by the following patches.
      
      The exception is those related to FCoE, which does not have a software
      fallback.
      Signed-off-by: default avatarToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d463504
  2. 03 Mar, 2015 1 commit
  3. 02 Mar, 2015 1 commit
  4. 12 Dec, 2014 1 commit
  5. 21 Nov, 2014 2 commits
  6. 07 Oct, 2014 1 commit
    • Eric Dumazet's avatar
      net: better IFF_XMIT_DST_RELEASE support · 02875878
      Eric Dumazet authored
      Testing xmit_more support with netperf and connected UDP sockets,
      I found strange dst refcount false sharing.
      
      Current handling of IFF_XMIT_DST_RELEASE is not optimal.
      
      Dropping dst in validate_xmit_skb() is certainly too late in case
      packet was queued by cpu X but dequeued by cpu Y
      
      The logical point to take care of drop/force is in __dev_queue_xmit()
      before even taking qdisc lock.
      
      As Julian Anastasov pointed out, need for skb_dst() might come from some
      packet schedulers or classifiers.
      
      This patch adds new helper to cleanly express needs of various drivers
      or qdiscs/classifiers.
      
      Drivers that need skb_dst() in their ndo_start_xmit() should call
      following helper in their setup instead of the prior :
      
      	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
      ->
      	netif_keep_dst(dev);
      
      Instead of using a single bit, we use two bits, one being
      eventually rebuilt in bonding/team drivers.
      
      The other one, is permanent and blocks IFF_XMIT_DST_RELEASE being
      rebuilt in bonding/team. Eventually, we could add something
      smarter later.
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Cc: Julian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      02875878
  7. 07 Jul, 2014 1 commit
  8. 03 Jul, 2014 1 commit
    • Eric Dumazet's avatar
      vlan: free percpu stats in device destructor · a48e5faf
      Eric Dumazet authored
      Madalin-Cristian reported crashs happening after a recent commit
      (5a4ae5f6 "vlan: unnecessary to check if vlan_pcpu_stats is NULL")
      
      -----------------------------------------------------------------------
      root@p5040ds:~# vconfig add eth8 1
      root@p5040ds:~# vconfig rem eth8.1
      Unable to handle kernel paging request for data at address 0x2bc88028
      Faulting instruction address: 0xc058e950
      Oops: Kernel access of bad area, sig: 11 [#1]
      SMP NR_CPUS=8 CoreNet Generic
      Modules linked in:
      CPU: 3 PID: 2167 Comm: vconfig Tainted: G        W     3.16.0-rc3-00346-g65e85bf #2
      task: e7264d90 ti: e2c2c000 task.ti: e2c2c000
      NIP: c058e950 LR: c058ea30 CTR: c058e900
      REGS: e2c2db20 TRAP: 0300   Tainted: G        W      (3.16.0-rc3-00346-g65e85bf)
      MSR: 00029002 <CE,EE,ME>  CR: 48000428  XER: 20000000
      DEAR: 2bc88028 ESR: 00000000
      GPR00: c047299c e2c2dbd0 e7264d90 00000000 2bc88000 00000000 ffffffff 00000000
      GPR08: 0000000f 00000000 000000ff 00000000 28000422 10121928 10100000 10100000
      GPR16: 10100000 00000000 c07c5968 00000000 00000000 00000000 e2c2dc48 e7838000
      GPR24: c07c5bac c07c58a8 e77290cc c07b0000 00000000 c05de6c0 e7838000 e2c2dc48
      NIP [c058e950] vlan_dev_get_stats64+0x50/0x170
      LR [c058ea30] vlan_dev_get_stats64+0x130/0x170
      Call Trace:
      [e2c2dbd0] [ffffffea] 0xffffffea (unreliable)
      [e2c2dc20] [c047299c] dev_get_stats+0x4c/0x140
      [e2c2dc40] [c0488ca8] rtnl_fill_ifinfo+0x3d8/0x960
      [e2c2dd70] [c0489f4c] rtmsg_ifinfo+0x6c/0x110
      [e2c2dd90] [c04731d4] rollback_registered_many+0x344/0x3b0
      [e2c2ddd0] [c047332c] rollback_registered+0x2c/0x50
      [e2c2ddf0] [c0476058] unregister_netdevice_queue+0x78/0xf0
      [e2c2de00] [c058d800] unregister_vlan_dev+0xc0/0x160
      [e2c2de20] [c058e360] vlan_ioctl_handler+0x1c0/0x550
      [e2c2de90] [c045d11c] sock_ioctl+0x28c/0x2f0
      [e2c2deb0] [c010d070] do_vfs_ioctl+0x90/0x7b0
      [e2c2df20] [c010d7d0] SyS_ioctl+0x40/0x80
      [e2c2df40] [c000f924] ret_from_syscall+0x0/0x3c
      
      Fix this problem by freeing percpu stats from dev->destructor() instead
      of ndo_uninit()
      Reported-by: default avatarMadalin-Cristian Bucur <madalin.bucur@freescale.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Tested-by: default avatarMadalin-Cristian Bucur <madalin.bucur@freescale.com>
      Fixes: 5a4ae5f6 ("vlan: unnecessary to check if vlan_pcpu_stats is NULL")
      Cc: Li RongQing <roy.qing.li@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a48e5faf
  9. 22 May, 2014 1 commit
    • Michal Kubeček's avatar
      vlan: more careful checksum features handling · da08143b
      Michal Kubeček authored
      When combining real_dev's features and vlan_features, simple
      bitwise AND is used. This doesn't work well for checksum
      offloading features as if one set has NETIF_F_HW_CSUM and the
      other NETIF_F_IP_CSUM and/or NETIF_F_IPV6_CSUM, we end up with
      no checksum offloading. However, from the logical point of view
      (how can_checksum_protocol() works), NETIF_F_HW_CSUM contains
      the functionality of NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM so
      that the result should be IP/IPV6.
      
      Add helper function netdev_intersect_features() implementing
      this logic and use it in vlan_dev_fix_features().
      Signed-off-by: default avatarMichal Kubecek <mkubecek@suse.cz>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      da08143b
  10. 17 May, 2014 1 commit
  11. 23 Apr, 2014 1 commit
  12. 18 Apr, 2014 1 commit
    • dingtianhong's avatar
      vlan: Fix lockdep warning when vlan dev handle notification · dc8eaaa0
      dingtianhong authored
      When I open the LOCKDEP config and run these steps:
      
      modprobe 8021q
      vconfig add eth2 20
      vconfig add eth2.20 30
      ifconfig eth2 xx.xx.xx.xx
      
      then the Call Trace happened:
      
      [32524.386288] =============================================
      [32524.386293] [ INFO: possible recursive locking detected ]
      [32524.386298] 3.14.0-rc2-0.7-default+ #35 Tainted: G           O
      [32524.386302] ---------------------------------------------
      [32524.386306] ifconfig/3103 is trying to acquire lock:
      [32524.386310]  (&vlan_netdev_addr_lock_key/1){+.....}, at: [<ffffffff814275f4>] dev_mc_sync+0x64/0xb0
      [32524.386326]
      [32524.386326] but task is already holding lock:
      [32524.386330]  (&vlan_netdev_addr_lock_key/1){+.....}, at: [<ffffffff8141af83>] dev_set_rx_mode+0x23/0x40
      [32524.386341]
      [32524.386341] other info that might help us debug this:
      [32524.386345]  Possible unsafe locking scenario:
      [32524.386345]
      [32524.386350]        CPU0
      [32524.386352]        ----
      [32524.386354]   lock(&vlan_netdev_addr_lock_key/1);
      [32524.386359]   lock(&vlan_netdev_addr_lock_key/1);
      [32524.386364]
      [32524.386364]  *** DEADLOCK ***
      [32524.386364]
      [32524.386368]  May be due to missing lock nesting notation
      [32524.386368]
      [32524.386373] 2 locks held by ifconfig/3103:
      [32524.386376]  #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff81431d42>] rtnl_lock+0x12/0x20
      [32524.386387]  #1:  (&vlan_netdev_addr_lock_key/1){+.....}, at: [<ffffffff8141af83>] dev_set_rx_mode+0x23/0x40
      [32524.386398]
      [32524.386398] stack backtrace:
      [32524.386403] CPU: 1 PID: 3103 Comm: ifconfig Tainted: G           O 3.14.0-rc2-0.7-default+ #35
      [32524.386409] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
      [32524.386414]  ffffffff81ffae40 ffff8800d9625ae8 ffffffff814f68a2 ffff8800d9625bc8
      [32524.386421]  ffffffff810a35fb ffff8800d8a8d9d0 00000000d9625b28 ffff8800d8a8e5d0
      [32524.386428]  000003cc00000000 0000000000000002 ffff8800d8a8e5f8 0000000000000000
      [32524.386435] Call Trace:
      [32524.386441]  [<ffffffff814f68a2>] dump_stack+0x6a/0x78
      [32524.386448]  [<ffffffff810a35fb>] __lock_acquire+0x7ab/0x1940
      [32524.386454]  [<ffffffff810a323a>] ? __lock_acquire+0x3ea/0x1940
      [32524.386459]  [<ffffffff810a4874>] lock_acquire+0xe4/0x110
      [32524.386464]  [<ffffffff814275f4>] ? dev_mc_sync+0x64/0xb0
      [32524.386471]  [<ffffffff814fc07a>] _raw_spin_lock_nested+0x2a/0x40
      [32524.386476]  [<ffffffff814275f4>] ? dev_mc_sync+0x64/0xb0
      [32524.386481]  [<ffffffff814275f4>] dev_mc_sync+0x64/0xb0
      [32524.386489]  [<ffffffffa0500cab>] vlan_dev_set_rx_mode+0x2b/0x50 [8021q]
      [32524.386495]  [<ffffffff8141addf>] __dev_set_rx_mode+0x5f/0xb0
      [32524.386500]  [<ffffffff8141af8b>] dev_set_rx_mode+0x2b/0x40
      [32524.386506]  [<ffffffff8141b3cf>] __dev_open+0xef/0x150
      [32524.386511]  [<ffffffff8141b177>] __dev_change_flags+0xa7/0x190
      [32524.386516]  [<ffffffff8141b292>] dev_change_flags+0x32/0x80
      [32524.386524]  [<ffffffff8149ca56>] devinet_ioctl+0x7d6/0x830
      [32524.386532]  [<ffffffff81437b0b>] ? dev_ioctl+0x34b/0x660
      [32524.386540]  [<ffffffff814a05b0>] inet_ioctl+0x80/0xa0
      [32524.386550]  [<ffffffff8140199d>] sock_do_ioctl+0x2d/0x60
      [32524.386558]  [<ffffffff81401a52>] sock_ioctl+0x82/0x2a0
      [32524.386568]  [<ffffffff811a7123>] do_vfs_ioctl+0x93/0x590
      [32524.386578]  [<ffffffff811b2705>] ? rcu_read_lock_held+0x45/0x50
      [32524.386586]  [<ffffffff811b39e5>] ? __fget_light+0x105/0x110
      [32524.386594]  [<ffffffff811a76b1>] SyS_ioctl+0x91/0xb0
      [32524.386604]  [<ffffffff815057e2>] system_call_fastpath+0x16/0x1b
      
      ========================================================================
      
      The reason is that all of the addr_lock_key for vlan dev have the same class,
      so if we change the status for vlan dev, the vlan dev and its real dev will
      hold the same class of addr_lock_key together, so the warning happened.
      
      we should distinguish the lock depth for vlan dev and its real dev.
      
      v1->v2: Convert the vlan_netdev_addr_lock_key to an array of eight elements, which
      	could support to add 8 vlan id on a same vlan dev, I think it is enough for current
      	scene, because a netdev's name is limited to IFNAMSIZ which could not hold 8 vlan id,
      	and the vlan dev would not meet the same class key with its real dev.
      
      	The new function vlan_dev_get_lockdep_subkey() will return the subkey and make the vlan
      	dev could get a suitable class key.
      
      v2->v3: According David's suggestion, I use the subclass to distinguish the lock key for vlan dev
      	and its real dev, but it make no sense, because the difference for subclass in the
      	lock_class_key doesn't mean that the difference class for lock_key, so I use lock_depth
      	to distinguish the different depth for every vlan dev, the same depth of the vlan dev
      	could have the same lock_class_key, I import the MAX_LOCK_DEPTH from the include/linux/sched.h,
      	I think it is enough here, the lockdep should never exceed that value.
      
      v3->v4: Add a huge array of locking keys will waste static kernel memory and is not a appropriate method,
      	we could use _nested() variants to fix the problem, calculate the depth for every vlan dev,
      	and use the depth as the subclass for addr_lock_key.
      Signed-off-by: default avatarDing Tianhong <dingtianhong@huawei.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dc8eaaa0
  13. 29 Mar, 2014 1 commit
  14. 28 Mar, 2014 1 commit
  15. 27 Mar, 2014 1 commit
  16. 15 Mar, 2014 1 commit
  17. 11 Mar, 2014 1 commit
  18. 14 Feb, 2014 1 commit
  19. 22 Jan, 2014 1 commit
  20. 31 Dec, 2013 1 commit
    • David S. Miller's avatar
      vlan: Fix header ops passthru when doing TX VLAN offload. · 2205369a
      David S. Miller authored
      When the vlan code detects that the real device can do TX VLAN offloads
      in hardware, it tries to arrange for the real device's header_ops to
      be invoked directly.
      
      But it does so illegally, by simply hooking the real device's
      header_ops up to the VLAN device.
      
      This doesn't work because we will end up invoking a set of header_ops
      routines which expect a device type which matches the real device, but
      will see a VLAN device instead.
      
      Fix this by providing a pass-thru set of header_ops which will arrange
      to pass the proper real device instead.
      
      To facilitate this add a dev_rebuild_header().  There are
      implementations which provide a ->cache and ->create but not a
      ->rebuild (f.e. PLIP).  So we need a helper function just like
      dev_hard_header() to avoid crashes.
      
      Use this helper in the one existing place where the
      header_ops->rebuild was being invoked, the neighbour code.
      
      With lots of help from Florian Westphal.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2205369a
  21. 11 Nov, 2013 1 commit
  22. 08 Nov, 2013 1 commit
  23. 06 Nov, 2013 1 commit
    • John Stultz's avatar
      net: Explicitly initialize u64_stats_sync structures for lockdep · 827da44c
      John Stultz authored
      In order to enable lockdep on seqcount/seqlock structures, we
      must explicitly initialize any locks.
      
      The u64_stats_sync structure, uses a seqcount, and thus we need
      to introduce a u64_stats_init() function and use it to initialize
      the structure.
      
      This unfortunately adds a lot of fairly trivial initialization code
      to a number of drivers. But the benefit of ensuring correctness makes
      this worth while.
      
      Because these changes are required for lockdep to be enabled, and the
      changes are quite trivial, I've not yet split this patch out into 30-some
      separate patches, as I figured it would be better to get the various
      maintainers thoughts on how to best merge this change along with
      the seqcount lockdep enablement.
      
      Feedback would be appreciated!
      Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
      Acked-by: default avatarJulian Anastasov <ja@ssi.bg>
      Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Eric Dumazet <eric.dumazet@gmail.com>
      Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
      Cc: James Morris <jmorris@namei.org>
      Cc: Jesse Gross <jesse@nicira.com>
      Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Cc: "Michael S. Tsirkin" <mst@redhat.com>
      Cc: Mirko Lindner <mlindner@marvell.com>
      Cc: Patrick McHardy <kaber@trash.net>
      Cc: Roger Luethi <rl@hellgate.ch>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Simon Horman <horms@verge.net.au>
      Cc: Stephen Hemminger <stephen@networkplumber.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
      Cc: Wensong Zhang <wensong@linux-vs.org>
      Cc: netdev@vger.kernel.org
      Link: http://lkml.kernel.org/r/1381186321-4906-2-git-send-email-john.stultz@linaro.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      827da44c
  24. 04 Sep, 2013 1 commit
  25. 03 Aug, 2013 1 commit
    • Wang Sheng-Hui's avatar
      vlan: cleanup the usage of vlan_dev_priv(dev) · 0c0667a8
      Wang Sheng-Hui authored
      This patch cleanup 2 points for the usage of vlan_dev_priv(dev):
      * In vlan_dev.c/vlan_dev_hard_header, we should use the var *vlan directly
        after grabing the pointer at the beginning with
              *vlan = vlan_dev_priv(dev);
        when we need to access the fields of *vlan.
      * In vlan.c/register_vlan_device, add the var *vlan pointer
              struct vlan_dev_priv *vlan;
      to cleanup the code to access the fields of vlan_dev_priv(new_dev).
      Signed-off-by: default avatarWang Sheng-Hui <shhuiw@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0c0667a8
  26. 18 Jul, 2013 1 commit
  27. 02 May, 2013 1 commit
  28. 19 Apr, 2013 3 commits
  29. 12 Feb, 2013 1 commit
    • Neil Horman's avatar
      netpoll: Fix __netpoll_rcu_free so that it can hold the rtnl lock · 2cde6acd
      Neil Horman authored
      __netpoll_rcu_free is used to free netpoll structures when the rtnl_lock is
      already held.  The mechanism is used to asynchronously call __netpoll_cleanup
      outside of the holding of the rtnl_lock, so as to avoid deadlock.
      Unfortunately, __netpoll_cleanup modifies pointers (dev->np), which means the
      rtnl_lock must be held while calling it.  Further, it cannot be held, because
      rcu callbacks may be issued in softirq contexts, which cannot sleep.
      
      Fix this by converting the rcu callback to a work queue that is guaranteed to
      get scheduled in process context, so that we can hold the rtnl properly while
      calling __netpoll_cleanup
      
      Tested successfully by myself.
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      CC: "David S. Miller" <davem@davemloft.net>
      CC: Cong Wang <amwang@redhat.com>
      CC: Eric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2cde6acd
  30. 11 Feb, 2013 1 commit
  31. 07 Jan, 2013 1 commit
  32. 09 Nov, 2012 1 commit
  33. 01 Nov, 2012 1 commit
  34. 14 Aug, 2012 4 commits