1. 01 Sep, 2016 6 commits
  2. 31 Aug, 2016 34 commits
    • David S. Miller's avatar
      Merge branch 'ppp-recursion' · 127661a4
      David S. Miller authored
      Guillaume Nault says:
      
      ====================
      ppp: fix deadlock upon recursive xmit
      
      This series fixes the issue reported by Feng where packets looping
      through a ppp device makes the module deadlock:
      https://marc.info/?l=linux-netdev&m=147134567319038&w=2
      
      The problem can occur on virtual interfaces (e.g. PPP over L2TP, or
      PPPoE on vxlan devices), when a PPP packet is routed back to the PPP
      interface.
      
      PPP's xmit path isn't reentrant, so patch #1 uses a per-cpu variable
      to detect and break recursion. Patch #2 sets the NETIF_F_LLTX flag to
      avoid lock inversion issues between ppp and txqueue locks.
      
      There are multiple entry points to the PPP xmit path. This series has
      been tested with lockdep and should address recursion issues no matter
      how the packet entered the path.
      
      A similar issue in L2TP is not covered by this series:
      l2tp_xmit_skb() also isn't reentrant, and it can be called as part of
      PPP's xmit path (pppol2tp_xmit()), or directly from the L2TP socket
      (l2tp_ppp_sendmsg()). If a packet is sent by l2tp_ppp_sendmsg() and
      routed to the parent PPP interface, then it's going to hit
      l2tp_xmit_skb() again.
      
      Breaking recursion as done in ppp_generic is not enough, because we'd
      still have a lock inversion issue (locking in l2tp_xmit_skb() can
      happen before or after locking in ppp_generic). The best approach would
      be to use the ip_tunnel functions and remove the socket locking in
      l2tp_xmit_skb(). But that'd be something for net-next.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      127661a4
    • Guillaume Nault's avatar
      ppp: declare PPP devices as LLTX · 07712770
      Guillaume Nault authored
      ppp_xmit_process() already locks the xmit path. If HARD_TX_LOCK() tries
      to hold the _xmit_lock we can get lock inversion.
      
      [  973.726130] ======================================================
      [  973.727311] [ INFO: possible circular locking dependency detected ]
      [  973.728546] 4.8.0-rc2 #1 Tainted: G           O
      [  973.728986] -------------------------------------------------------
      [  973.728986] accel-pppd/1806 is trying to acquire lock:
      [  973.728986]  (&qdisc_xmit_lock_key){+.-...}, at: [<ffffffff8146f6fe>] sch_direct_xmit+0x8d/0x221
      [  973.728986]
      [  973.728986] but task is already holding lock:
      [  973.728986]  (l2tp_sock){+.-...}, at: [<ffffffffa0202c4a>] l2tp_xmit_skb+0x1e8/0x5d7 [l2tp_core]
      [  973.728986]
      [  973.728986] which lock already depends on the new lock.
      [  973.728986]
      [  973.728986]
      [  973.728986] the existing dependency chain (in reverse order) is:
      [  973.728986]
      -> #3 (l2tp_sock){+.-...}:
      [  973.728986]        [<ffffffff810b3130>] lock_acquire+0x150/0x217
      [  973.728986]        [<ffffffff815752f4>] _raw_spin_lock+0x2d/0x3c
      [  973.728986]        [<ffffffffa0202c4a>] l2tp_xmit_skb+0x1e8/0x5d7 [l2tp_core]
      [  973.728986]        [<ffffffffa01b2466>] pppol2tp_xmit+0x1f2/0x25e [l2tp_ppp]
      [  973.728986]        [<ffffffffa0184f59>] ppp_channel_push+0xb5/0x14a [ppp_generic]
      [  973.728986]        [<ffffffffa01853ed>] ppp_write+0x104/0x11c [ppp_generic]
      [  973.728986]        [<ffffffff811b2ec6>] __vfs_write+0x56/0x120
      [  973.728986]        [<ffffffff811b3f4c>] vfs_write+0xbd/0x11b
      [  973.728986]        [<ffffffff811b4cb2>] SyS_write+0x5e/0x96
      [  973.728986]        [<ffffffff81575ba5>] entry_SYSCALL_64_fastpath+0x18/0xa8
      [  973.728986]
      -> #2 (&(&pch->downl)->rlock){+.-...}:
      [  973.728986]        [<ffffffff810b3130>] lock_acquire+0x150/0x217
      [  973.728986]        [<ffffffff81575334>] _raw_spin_lock_bh+0x31/0x40
      [  973.728986]        [<ffffffffa01808e2>] ppp_push+0xa7/0x82d [ppp_generic]
      [  973.728986]        [<ffffffffa0184675>] __ppp_xmit_process+0x48/0x877 [ppp_generic]
      [  973.728986]        [<ffffffffa018505b>] ppp_xmit_process+0x4b/0xaf [ppp_generic]
      [  973.728986]        [<ffffffffa01853f7>] ppp_write+0x10e/0x11c [ppp_generic]
      [  973.728986]        [<ffffffff811b2ec6>] __vfs_write+0x56/0x120
      [  973.728986]        [<ffffffff811b3f4c>] vfs_write+0xbd/0x11b
      [  973.728986]        [<ffffffff811b4cb2>] SyS_write+0x5e/0x96
      [  973.728986]        [<ffffffff81575ba5>] entry_SYSCALL_64_fastpath+0x18/0xa8
      [  973.728986]
      -> #1 (&(&ppp->wlock)->rlock){+.-...}:
      [  973.728986]        [<ffffffff810b3130>] lock_acquire+0x150/0x217
      [  973.728986]        [<ffffffff81575334>] _raw_spin_lock_bh+0x31/0x40
      [  973.728986]        [<ffffffffa0184654>] __ppp_xmit_process+0x27/0x877 [ppp_generic]
      [  973.728986]        [<ffffffffa018505b>] ppp_xmit_process+0x4b/0xaf [ppp_generic]
      [  973.728986]        [<ffffffffa01852da>] ppp_start_xmit+0x21b/0x22a [ppp_generic]
      [  973.728986]        [<ffffffff8143f767>] dev_hard_start_xmit+0x1a9/0x43d
      [  973.728986]        [<ffffffff8146f747>] sch_direct_xmit+0xd6/0x221
      [  973.728986]        [<ffffffff814401e4>] __dev_queue_xmit+0x62a/0x912
      [  973.728986]        [<ffffffff814404d7>] dev_queue_xmit+0xb/0xd
      [  973.728986]        [<ffffffff81449978>] neigh_direct_output+0xc/0xe
      [  973.728986]        [<ffffffff8150e62b>] ip6_finish_output2+0x5a9/0x623
      [  973.728986]        [<ffffffff81512128>] ip6_output+0x15e/0x16a
      [  973.728986]        [<ffffffff8153ef86>] dst_output+0x76/0x7f
      [  973.728986]        [<ffffffff8153f737>] mld_sendpack+0x335/0x404
      [  973.728986]        [<ffffffff81541c61>] mld_send_initial_cr.part.21+0x99/0xa2
      [  973.728986]        [<ffffffff8154441d>] ipv6_mc_dad_complete+0x42/0x71
      [  973.728986]        [<ffffffff8151c4bd>] addrconf_dad_completed+0x1cf/0x2ea
      [  973.728986]        [<ffffffff8151e4fa>] addrconf_dad_work+0x453/0x520
      [  973.728986]        [<ffffffff8107a393>] process_one_work+0x365/0x6f0
      [  973.728986]        [<ffffffff8107aecd>] worker_thread+0x2de/0x421
      [  973.728986]        [<ffffffff810816fb>] kthread+0x121/0x130
      [  973.728986]        [<ffffffff81575dbf>] ret_from_fork+0x1f/0x40
      [  973.728986]
      -> #0 (&qdisc_xmit_lock_key){+.-...}:
      [  973.728986]        [<ffffffff810b28d6>] __lock_acquire+0x1118/0x1483
      [  973.728986]        [<ffffffff810b3130>] lock_acquire+0x150/0x217
      [  973.728986]        [<ffffffff815752f4>] _raw_spin_lock+0x2d/0x3c
      [  973.728986]        [<ffffffff8146f6fe>] sch_direct_xmit+0x8d/0x221
      [  973.728986]        [<ffffffff814401e4>] __dev_queue_xmit+0x62a/0x912
      [  973.728986]        [<ffffffff814404d7>] dev_queue_xmit+0xb/0xd
      [  973.728986]        [<ffffffff81449978>] neigh_direct_output+0xc/0xe
      [  973.728986]        [<ffffffff81487811>] ip_finish_output2+0x5db/0x609
      [  973.728986]        [<ffffffff81489590>] ip_finish_output+0x152/0x15e
      [  973.728986]        [<ffffffff8148a0d4>] ip_output+0x8c/0x96
      [  973.728986]        [<ffffffff81489652>] ip_local_out+0x41/0x4a
      [  973.728986]        [<ffffffff81489e7d>] ip_queue_xmit+0x5a5/0x609
      [  973.728986]        [<ffffffffa0202fe4>] l2tp_xmit_skb+0x582/0x5d7 [l2tp_core]
      [  973.728986]        [<ffffffffa01b2466>] pppol2tp_xmit+0x1f2/0x25e [l2tp_ppp]
      [  973.728986]        [<ffffffffa0184f59>] ppp_channel_push+0xb5/0x14a [ppp_generic]
      [  973.728986]        [<ffffffffa01853ed>] ppp_write+0x104/0x11c [ppp_generic]
      [  973.728986]        [<ffffffff811b2ec6>] __vfs_write+0x56/0x120
      [  973.728986]        [<ffffffff811b3f4c>] vfs_write+0xbd/0x11b
      [  973.728986]        [<ffffffff811b4cb2>] SyS_write+0x5e/0x96
      [  973.728986]        [<ffffffff81575ba5>] entry_SYSCALL_64_fastpath+0x18/0xa8
      [  973.728986]
      [  973.728986] other info that might help us debug this:
      [  973.728986]
      [  973.728986] Chain exists of:
        &qdisc_xmit_lock_key --> &(&pch->downl)->rlock --> l2tp_sock
      
      [  973.728986]  Possible unsafe locking scenario:
      [  973.728986]
      [  973.728986]        CPU0                    CPU1
      [  973.728986]        ----                    ----
      [  973.728986]   lock(l2tp_sock);
      [  973.728986]                                lock(&(&pch->downl)->rlock);
      [  973.728986]                                lock(l2tp_sock);
      [  973.728986]   lock(&qdisc_xmit_lock_key);
      [  973.728986]
      [  973.728986]  *** DEADLOCK ***
      [  973.728986]
      [  973.728986] 6 locks held by accel-pppd/1806:
      [  973.728986]  #0:  (&(&pch->downl)->rlock){+.-...}, at: [<ffffffffa0184efa>] ppp_channel_push+0x56/0x14a [ppp_generic]
      [  973.728986]  #1:  (l2tp_sock){+.-...}, at: [<ffffffffa0202c4a>] l2tp_xmit_skb+0x1e8/0x5d7 [l2tp_core]
      [  973.728986]  #2:  (rcu_read_lock){......}, at: [<ffffffff81486981>] rcu_lock_acquire+0x0/0x20
      [  973.728986]  #3:  (rcu_read_lock_bh){......}, at: [<ffffffff81486981>] rcu_lock_acquire+0x0/0x20
      [  973.728986]  #4:  (rcu_read_lock_bh){......}, at: [<ffffffff814340e3>] rcu_lock_acquire+0x0/0x20
      [  973.728986]  #5:  (dev->qdisc_running_key ?: &qdisc_running_key#2){+.....}, at: [<ffffffff8144011e>] __dev_queue_xmit+0x564/0x912
      [  973.728986]
      [  973.728986] stack backtrace:
      [  973.728986] CPU: 2 PID: 1806 Comm: accel-pppd Tainted: G           O    4.8.0-rc2 #1
      [  973.728986] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
      [  973.728986]  ffff7fffffffffff ffff88003436f850 ffffffff812a20f4 ffffffff82156e30
      [  973.728986]  ffffffff82156920 ffff88003436f890 ffffffff8115c759 ffff88003344ae00
      [  973.728986]  ffff88003344b5c0 0000000000000002 0000000000000006 ffff88003344b5e8
      [  973.728986] Call Trace:
      [  973.728986]  [<ffffffff812a20f4>] dump_stack+0x67/0x90
      [  973.728986]  [<ffffffff8115c759>] print_circular_bug+0x22e/0x23c
      [  973.728986]  [<ffffffff810b28d6>] __lock_acquire+0x1118/0x1483
      [  973.728986]  [<ffffffff810b3130>] lock_acquire+0x150/0x217
      [  973.728986]  [<ffffffff810b3130>] ? lock_acquire+0x150/0x217
      [  973.728986]  [<ffffffff8146f6fe>] ? sch_direct_xmit+0x8d/0x221
      [  973.728986]  [<ffffffff815752f4>] _raw_spin_lock+0x2d/0x3c
      [  973.728986]  [<ffffffff8146f6fe>] ? sch_direct_xmit+0x8d/0x221
      [  973.728986]  [<ffffffff8146f6fe>] sch_direct_xmit+0x8d/0x221
      [  973.728986]  [<ffffffff814401e4>] __dev_queue_xmit+0x62a/0x912
      [  973.728986]  [<ffffffff814404d7>] dev_queue_xmit+0xb/0xd
      [  973.728986]  [<ffffffff81449978>] neigh_direct_output+0xc/0xe
      [  973.728986]  [<ffffffff81487811>] ip_finish_output2+0x5db/0x609
      [  973.728986]  [<ffffffff81486853>] ? dst_mtu+0x29/0x2e
      [  973.728986]  [<ffffffff81489590>] ip_finish_output+0x152/0x15e
      [  973.728986]  [<ffffffff8148a0bc>] ? ip_output+0x74/0x96
      [  973.728986]  [<ffffffff8148a0d4>] ip_output+0x8c/0x96
      [  973.728986]  [<ffffffff81489652>] ip_local_out+0x41/0x4a
      [  973.728986]  [<ffffffff81489e7d>] ip_queue_xmit+0x5a5/0x609
      [  973.728986]  [<ffffffff814c559e>] ? udp_set_csum+0x207/0x21e
      [  973.728986]  [<ffffffffa0202fe4>] l2tp_xmit_skb+0x582/0x5d7 [l2tp_core]
      [  973.728986]  [<ffffffffa01b2466>] pppol2tp_xmit+0x1f2/0x25e [l2tp_ppp]
      [  973.728986]  [<ffffffffa0184f59>] ppp_channel_push+0xb5/0x14a [ppp_generic]
      [  973.728986]  [<ffffffffa01853ed>] ppp_write+0x104/0x11c [ppp_generic]
      [  973.728986]  [<ffffffff811b2ec6>] __vfs_write+0x56/0x120
      [  973.728986]  [<ffffffff8124c11d>] ? fsnotify_perm+0x27/0x95
      [  973.728986]  [<ffffffff8124d41d>] ? security_file_permission+0x4d/0x54
      [  973.728986]  [<ffffffff811b3f4c>] vfs_write+0xbd/0x11b
      [  973.728986]  [<ffffffff811b4cb2>] SyS_write+0x5e/0x96
      [  973.728986]  [<ffffffff81575ba5>] entry_SYSCALL_64_fastpath+0x18/0xa8
      [  973.728986]  [<ffffffff810ae0fa>] ? trace_hardirqs_off_caller+0x121/0x12f
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      07712770
    • Guillaume Nault's avatar
      ppp: avoid dealock on recursive xmit · 55454a56
      Guillaume Nault authored
      In case of misconfiguration, a virtual PPP channel might send packets
      back to their parent PPP interface. This typically happens in
      misconfigured L2TP setups, where PPP's peer IP address is set with the
      IP of the L2TP peer.
      When that happens the system hangs due to PPP trying to recursively
      lock its xmit path.
      
      [  243.332155] BUG: spinlock recursion on CPU#1, accel-pppd/926
      [  243.333272]  lock: 0xffff880033d90f18, .magic: dead4ead, .owner: accel-pppd/926, .owner_cpu: 1
      [  243.334859] CPU: 1 PID: 926 Comm: accel-pppd Not tainted 4.8.0-rc2 #1
      [  243.336010] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
      [  243.336018]  ffff7fffffffffff ffff8800319a77a0 ffffffff8128de85 ffff880033d90f18
      [  243.336018]  ffff880033ad8000 ffff8800319a77d8 ffffffff810ad7c0 ffffffff0000039e
      [  243.336018]  ffff880033d90f18 ffff880033d90f60 ffff880033d90f18 ffff880033d90f28
      [  243.336018] Call Trace:
      [  243.336018]  [<ffffffff8128de85>] dump_stack+0x4f/0x65
      [  243.336018]  [<ffffffff810ad7c0>] spin_dump+0xe1/0xeb
      [  243.336018]  [<ffffffff810ad7f0>] spin_bug+0x26/0x28
      [  243.336018]  [<ffffffff810ad8b9>] do_raw_spin_lock+0x5c/0x160
      [  243.336018]  [<ffffffff815522aa>] _raw_spin_lock_bh+0x35/0x3c
      [  243.336018]  [<ffffffffa01a88e2>] ? ppp_push+0xa7/0x82d [ppp_generic]
      [  243.336018]  [<ffffffffa01a88e2>] ppp_push+0xa7/0x82d [ppp_generic]
      [  243.336018]  [<ffffffff810adada>] ? do_raw_spin_unlock+0xc2/0xcc
      [  243.336018]  [<ffffffff81084962>] ? preempt_count_sub+0x13/0xc7
      [  243.336018]  [<ffffffff81552438>] ? _raw_spin_unlock_irqrestore+0x34/0x49
      [  243.336018]  [<ffffffffa01ac657>] ppp_xmit_process+0x48/0x877 [ppp_generic]
      [  243.336018]  [<ffffffff81084962>] ? preempt_count_sub+0x13/0xc7
      [  243.336018]  [<ffffffff81408cd3>] ? skb_queue_tail+0x71/0x7c
      [  243.336018]  [<ffffffffa01ad1c5>] ppp_start_xmit+0x21b/0x22a [ppp_generic]
      [  243.336018]  [<ffffffff81426af1>] dev_hard_start_xmit+0x15e/0x32c
      [  243.336018]  [<ffffffff81454ed7>] sch_direct_xmit+0xd6/0x221
      [  243.336018]  [<ffffffff814273a8>] __dev_queue_xmit+0x52a/0x820
      [  243.336018]  [<ffffffff814276a9>] dev_queue_xmit+0xb/0xd
      [  243.336018]  [<ffffffff81430a3c>] neigh_direct_output+0xc/0xe
      [  243.336018]  [<ffffffff8146b5d7>] ip_finish_output2+0x4d2/0x548
      [  243.336018]  [<ffffffff8146a8e6>] ? dst_mtu+0x29/0x2e
      [  243.336018]  [<ffffffff8146d49c>] ip_finish_output+0x152/0x15e
      [  243.336018]  [<ffffffff8146df84>] ? ip_output+0x74/0x96
      [  243.336018]  [<ffffffff8146df9c>] ip_output+0x8c/0x96
      [  243.336018]  [<ffffffff8146d55e>] ip_local_out+0x41/0x4a
      [  243.336018]  [<ffffffff8146dd15>] ip_queue_xmit+0x531/0x5c5
      [  243.336018]  [<ffffffff814a82cd>] ? udp_set_csum+0x207/0x21e
      [  243.336018]  [<ffffffffa01f2f04>] l2tp_xmit_skb+0x582/0x5d7 [l2tp_core]
      [  243.336018]  [<ffffffffa01ea458>] pppol2tp_xmit+0x1eb/0x257 [l2tp_ppp]
      [  243.336018]  [<ffffffffa01acf17>] ppp_channel_push+0x91/0x102 [ppp_generic]
      [  243.336018]  [<ffffffffa01ad2d8>] ppp_write+0x104/0x11c [ppp_generic]
      [  243.336018]  [<ffffffff811a3c1e>] __vfs_write+0x56/0x120
      [  243.336018]  [<ffffffff81239801>] ? fsnotify_perm+0x27/0x95
      [  243.336018]  [<ffffffff8123ab01>] ? security_file_permission+0x4d/0x54
      [  243.336018]  [<ffffffff811a4ca4>] vfs_write+0xbd/0x11b
      [  243.336018]  [<ffffffff811a5a0a>] SyS_write+0x5e/0x96
      [  243.336018]  [<ffffffff81552a1b>] entry_SYSCALL_64_fastpath+0x13/0x94
      
      The main entry points for sending packets over a PPP unit are the
      .write() and .ndo_start_xmit() callbacks (simplified view):
      
      .write(unit fd) or .ndo_start_xmit()
             \
              CALL ppp_xmit_process()
                     \
                      LOCK unit's xmit path (ppp->wlock)
                      |
                      CALL ppp_push()
                             \
                              LOCK channel's xmit path (chan->downl)
                              |
                              CALL lower layer's .start_xmit() callback
                                     \
                                      ... might recursively call .ndo_start_xmit() ...
                                     /
                              RETURN from .start_xmit()
                              |
                              UNLOCK channel's xmit path
                             /
                      RETURN from ppp_push()
                      |
                      UNLOCK unit's xmit path
                     /
              RETURN from ppp_xmit_process()
      
      Packets can also be directly sent on channels (e.g. LCP packets):
      
      .write(channel fd) or ppp_output_wakeup()
             \
              CALL ppp_channel_push()
                     \
                      LOCK channel's xmit path (chan->downl)
                      |
                      CALL lower layer's .start_xmit() callback
                             \
                              ... might call .ndo_start_xmit() ...
                             /
                      RETURN from .start_xmit()
                      |
                      UNLOCK channel's xmit path
                     /
              RETURN from ppp_channel_push()
      
      Key points about the lower layer's .start_xmit() callback:
      
        * It can be called directly by a channel fd .write() or by
          ppp_output_wakeup() or indirectly by a unit fd .write() or by
          .ndo_start_xmit().
      
        * In any case, it's always called with chan->downl held.
      
        * It might route the packet back to its parent unit using
          .ndo_start_xmit() as entry point.
      
      This patch detects and breaks recursion in ppp_xmit_process(). This
      function is a good candidate for the task because it's called early
      enough after .ndo_start_xmit(), it's always part of the recursion
      loop and it's on the path of whatever entry point is used to send
      a packet on a PPP unit.
      
      Recursion detection is done using the per-cpu ppp_xmit_recursion
      variable.
      
      Since ppp_channel_push() too locks the channel's xmit path and calls
      the lower layer's .start_xmit() callback, we need to also increment
      ppp_xmit_recursion there. However there's no need to check for
      recursion, as it's out of the recursion loop.
      Reported-by: default avatarFeng Gao <gfree.wind@gmail.com>
      Signed-off-by: default avatarGuillaume Nault <g.nault@alphalink.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      55454a56
    • stephen hemminger's avatar
      xgbe: constify get_netdev_ops and get_ethtool_ops · ce0b15d1
      stephen hemminger authored
      Casting away const is bad practice. Since this is ARM specific driver
      don't have hardware actually test this.
      
      Having getter functions for ops is really unnecessary code bloat, but
      not going to touch that.
      Signed-off-by: default avatarStephen Hemminger <stephen@networkplumber.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ce0b15d1
    • David S. Miller's avatar
      Merge branch 'dsa-mdb-support' · 07469f8c
      David S. Miller authored
      Vivien Didelot says:
      
      ====================
      net: dsa: add MDB support
      
      This patchset adds the switchdev MDB object support to the DSA layer.
      
      The MDB support for the mv88e6xxx driver is very similar to the FDB
      support. The FDB operations care about unicast addresses while the MDB
      operations care about multicast addresses.
      
      Both operation set load/purge/dump the Address Translation Table (ATU),
      thus common code is used.
      
      Changes in v2 based on Andrew's comments:
        - drop "group" in multicast database related doc and comment
        - change _one for more relevant _fid in mv88e6xxx_port_db_dump_one
        - return -EOPNOTSUPP if switchdev obj ID is neither _FDB nor _MDB
      ====================
      Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      07469f8c
    • Vivien Didelot's avatar
      net: dsa: mv88e6xxx: add MDB support · 7df8fbdd
      Vivien Didelot authored
      Add support for the MDB operations. This consists of
      loading/purging/dumping multicast addresses for a given port in the ATU.
      Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7df8fbdd
    • Vivien Didelot's avatar
      net: dsa: mv88e6xxx: make switchdev DB ops generic · 83dabd1f
      Vivien Didelot authored
      The MDB support for the mv88e6xxx driver will be very similar to the FDB
      support, since it consists of loading/purging/dumping address to/from
      the Address Translation Unit (ATU).
      
      Prepare the support for MDB by making the FDB code accessing the ATU
      generic. The FDB operations now provide access to the unicast addresses
      while the MDB operations will provide access to the multicast addresses.
      Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83dabd1f
    • Vivien Didelot's avatar
      net: dsa: add MDB support · 8df30255
      Vivien Didelot authored
      Add SWITCHDEV_OBJ_ID_PORT_MDB support to the DSA layer.
      Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8df30255
    • David S. Miller's avatar
      Merge branch 'liquidio-CN23XX-part-1' · dbeb714a
      David S. Miller authored
      Raghu Vatsavayi says:
      
      ====================
      liquidio CN23XX support
      
      Following patchset adds support for new device "CN23XX" in
      liquidio family of adapters. As adviced by you I have split
      the previous V3 patch of 18 patches into two halves. This
      first patchset has first 10 patches, which are tested against
      net-next. I will post the second half after this one.
      
      This V4 patch also addressed all the comments from previous
      submission:
      1) Avoid busy loop while reading registers.
      2) Other minor comments about debug messages and constants.
      
      Please apply patches in following order as some of the
      patches depend on earlier patches.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dbeb714a
    • Raghu Vatsavayi's avatar
      c0eab5b3
    • Raghu Vatsavayi's avatar
      liquidio: MSIX support for CN23XX · 5b07aee1
      Raghu Vatsavayi authored
      This patch adds support msix interrupt for cn23xx device.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5b07aee1
    • Raghu Vatsavayi's avatar
      liquidio: CN23XX queue manipulation · 1b7c55c4
      Raghu Vatsavayi authored
      This patch adds support for cn23xx queue manipulation.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1b7c55c4
    • Raghu Vatsavayi's avatar
      liquidio: CN23XX register setup · 3451b97c
      Raghu Vatsavayi authored
      Adds support for initializing cn23xx device registers
      related to mac, input/output and pf global config.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3451b97c
    • Raghu Vatsavayi's avatar
      liquidio: CN23XX device init and sriov config · 72c00912
      Raghu Vatsavayi authored
      Add support for cn23xx device init and sriov queue config.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      72c00912
    • Raghu Vatsavayi's avatar
      liquidio: CN23XX queue definitions · e86b1ab6
      Raghu Vatsavayi authored
      Add support for cn23xx specific queue definitions and
      features.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e86b1ab6
    • Raghu Vatsavayi's avatar
      liquidio: CN23XX register definitions · 5bc67f58
      Raghu Vatsavayi authored
      This patch adds register definitions and structures for new
      device cn23xx.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5bc67f58
    • Raghu Vatsavayi's avatar
      liquidio: Common enable irq function · cd8b1eb4
      Raghu Vatsavayi authored
      Add support of common irq enable functionality for both
      iq(instruction queue) and oq(output queue).
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cd8b1eb4
    • Raghu Vatsavayi's avatar
      liquidio: Firmware version management · 83101ce3
      Raghu Vatsavayi authored
      This patch contains changes for firmware version management.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83101ce3
    • Raghu Vatsavayi's avatar
      liquidio: Consolidate common functionality · 32581245
      Raghu Vatsavayi authored
      Consolidate common functionality of various devices
      from different files into lio_core.c/octeon_console.c.
      Signed-off-by: default avatarDerek Chickles <derek.chickles@caviumnetworks.com>
      Signed-off-by: default avatarSatanand Burla <satananda.burla@caviumnetworks.com>
      Signed-off-by: default avatarFelix Manlunas <felix.manlunas@caviumnetworks.com>
      Signed-off-by: default avatarRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      32581245
    • Geert Uytterhoeven's avatar
    • Julia Lawall's avatar
      net: systemport: constify ethtool_ops structures · c1ab0e9c
      Julia Lawall authored
      Check for ethtool_ops structures that are only stored in the ethtool_ops
      field of a net_device structure or passed as the second argument to
      netdev_set_default_ethtool_ops.  These contexts are declared const, so
      ethtool_ops structures that have these properties can be declared as const
      also.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @r disable optional_qualifier@
      identifier i;
      position p;
      @@
      static struct ethtool_ops i@p = { ... };
      
      @ok1@
      identifier r.i;
      struct net_device e;
      position p;
      @@
      e.ethtool_ops = &i@p;
      
      @ok2@
      identifier r.i;
      expression e;
      position p;
      @@
      netdev_set_default_ethtool_ops(e, &i@p)
      
      @bad@
      position p != {r.p,ok1.p,ok2.p};
      identifier r.i;
      @@
      i@p
      
      @depends on !bad disable optional_qualifier@
      identifier r.i;
      @@
      static
      +const
       struct ethtool_ops i = { ... };
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c1ab0e9c
    • Julia Lawall's avatar
      dwc_eth_qos: constify ethtool_ops structures · 777065e5
      Julia Lawall authored
      Check for ethtool_ops structures that are only stored in the ethtool_ops
      field of a net_device structure or passed as the second argument to
      netdev_set_default_ethtool_ops.  These contexts are declared const, so
      ethtool_ops structures that have these properties can be declared as const
      also.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @r disable optional_qualifier@
      identifier i;
      position p;
      @@
      static struct ethtool_ops i@p = { ... };
      
      @ok1@
      identifier r.i;
      struct net_device e;
      position p;
      @@
      e.ethtool_ops = &i@p;
      
      @ok2@
      identifier r.i;
      expression e;
      position p;
      @@
      netdev_set_default_ethtool_ops(e, &i@p)
      
      @bad@
      position p != {r.p,ok1.p,ok2.p};
      identifier r.i;
      @@
      i@p
      
      @depends on !bad disable optional_qualifier@
      identifier r.i;
      @@
      static
      +const
       struct ethtool_ops i = { ... };
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      777065e5
    • Julia Lawall's avatar
      net: hisilicon: constify ethtool_ops structures · bc6f0136
      Julia Lawall authored
      Check for ethtool_ops structures that are only stored in the ethtool_ops
      field of a net_device structure or passed as the second argument to
      netdev_set_default_ethtool_ops.  These contexts are declared const, so
      ethtool_ops structures that have these properties can be declared as const
      also.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @r disable optional_qualifier@
      identifier i;
      position p;
      @@
      static struct ethtool_ops i@p = { ... };
      
      @ok1@
      identifier r.i;
      struct net_device e;
      position p;
      @@
      e.ethtool_ops = &i@p;
      
      @ok2@
      identifier r.i;
      expression e;
      position p;
      @@
      netdev_set_default_ethtool_ops(e, &i@p)
      
      @bad@
      position p != {r.p,ok1.p,ok2.p};
      identifier r.i;
      @@
      i@p
      
      @depends on !bad disable optional_qualifier@
      identifier r.i;
      @@
      static
      +const
       struct ethtool_ops i = { ... };
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bc6f0136
    • Julia Lawall's avatar
      net: bcmgenet: constify ethtool_ops structures · 70591ab9
      Julia Lawall authored
      Check for ethtool_ops structures that are only stored in the ethtool_ops
      field of a net_device structure or passed as the second argument to
      netdev_set_default_ethtool_ops.  These contexts are declared const, so
      ethtool_ops structures that have these properties can be declared as const
      also.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @r disable optional_qualifier@
      identifier i;
      position p;
      @@
      static struct ethtool_ops i@p = { ... };
      
      @ok1@
      identifier r.i;
      struct net_device e;
      position p;
      @@
      e.ethtool_ops = &i@p;
      
      @ok2@
      identifier r.i;
      expression e;
      position p;
      @@
      netdev_set_default_ethtool_ops(e, &i@p)
      
      @bad@
      position p != {r.p,ok1.p,ok2.p};
      identifier r.i;
      @@
      i@p
      
      @depends on !bad disable optional_qualifier@
      identifier r.i;
      @@
      static
      +const
       struct ethtool_ops i = { ... };
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      70591ab9
    • Julia Lawall's avatar
      net: ethernet: et131x: constify ethtool_ops structures · 1eff7002
      Julia Lawall authored
      Check for ethtool_ops structures that are only stored in the ethtool_ops
      field of a net_device structure or passed as the second argument to
      netdev_set_default_ethtool_ops.  These contexts are declared const, so
      ethtool_ops structures that have these properties can be declared as const
      also.
      
      The semantic patch that makes this change is as follows:
      (http://coccinelle.lip6.fr/)
      
      // <smpl>
      @r disable optional_qualifier@
      identifier i;
      position p;
      @@
      static struct ethtool_ops i@p = { ... };
      
      @ok1@
      identifier r.i;
      struct net_device e;
      position p;
      @@
      e.ethtool_ops = &i@p;
      
      @ok2@
      identifier r.i;
      expression e;
      position p;
      @@
      netdev_set_default_ethtool_ops(e, &i@p)
      
      @bad@
      position p != {r.p,ok1.p,ok2.p};
      identifier r.i;
      @@
      i@p
      
      @depends on !bad disable optional_qualifier@
      identifier r.i;
      @@
      static
      +const
       struct ethtool_ops i = { ... };
      // </smpl>
      Signed-off-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Acked-by: default avatarMark Einon <mark.einon@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1eff7002
    • Arnd Bergmann's avatar
      qede: hide 32-bit compile warning · 84fd1b19
      Arnd Bergmann authored
      The addition of the per-queue statistics introduced a harmless warning
      on all 32-bit architectures:
      
      drivers/net/ethernet/qlogic/qede/qede_ethtool.c: In function 'qede_get_ethtool_stats':
      drivers/net/ethernet/qlogic/qede/qede_ethtool.c:244:31: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
            buf[cnt++] = QEDE_TQSTATS_DATA(edev,
                                     ^
      drivers/net/ethernet/qlogic/qede/qede_ethtool.c:244:22: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
            buf[cnt++] = QEDE_TQSTATS_DATA(edev,
                            ^
      This changes the cast to 'void *' to shut up the warning, which
      avoids the assumptions on the size of the pointer type.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 68db9ec2 ("qede: Add support for per-queue stats.")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      84fd1b19
    • Arnd Bergmann's avatar
      ravb: avoid unused function warnings · 1ddcf41f
      Arnd Bergmann authored
      When CONFIG_PM_SLEEP is disabled, we get a couple of harmless warnings:
      
      drivers/net/ethernet/renesas/ravb_main.c:2117:12: error: 'ravb_resume' defined but not used [-Werror=unused-function]
      drivers/net/ethernet/renesas/ravb_main.c:2104:12: error: 'ravb_suspend' defined but not used [-Werror=unused-function]
      
      The simplest solution here is to replace the #ifdef with __maybe_unused
      annotations, which lets the compiler do the right thing by itself.
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixes: 0184165b ("ravb: add sleep PM suspend/resume support")
      Acked-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1ddcf41f
    • David S. Miller's avatar
      Merge branch 'mpls-fragmentation-and-gso-fixes' · 7ba9d103
      David S. Miller authored
      David Ahern says:
      
      ====================
      net: mpls: fragmentation and gso fixes for locally originated traffic
      
      This series fixes mtu and fragmentation for tunnels using lwtunnel
      output redirect, and fixes GSO for MPLS for locally originated traffic
      reported by Lennert Buytenhek.
      
      A follow on series will address fragmentation and GSO for forwarded
      MPLS traffic. Hardware offload of GSO with MPLS also needs to be
      addressed.
      
      Simon: Can you verify this works with OVS for single and multiple
             labels?
      
      v4
      - more updates to mpls_gso_segment per Alex's comments (thanks, Alex)
      - updates to teaching OVS about marking MPLS labels as the network header
      
      v3
      - updates to mpls_gso_segment per Alex's comments
      - dropped skb->encapsulation = 1 from mpls_xmit per Alex's comment
      
      v2
      - consistent use of network_header in skb to fix GSO for MPLS
      - update MPLS code in OVS to network_header and inner_network_header
      ====================
      Tested-by: default avatarSimon Horman <simon.horman@netronome.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7ba9d103
    • David Ahern's avatar
      net: veth: Set features for MPLS · 607fca9a
      David Ahern authored
      veth does not really transmit packets only moves the skb from one
      netdev to another so gso and checksum is not really needed. Add
      the features to mpls_features to get the same benefit and performance
      with MPLS as without it.
      Reported-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
      Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      607fca9a
    • David Ahern's avatar
      net: mpls: Fixups for GSO · 48d2ab60
      David Ahern authored
      As reported by Lennert the MPLS GSO code is failing to properly segment
      large packets. There are a couple of problems:
      
      1. the inner protocol is not set so the gso segment functions for inner
         protocol layers are not getting run, and
      
      2  MPLS labels for packets that use the "native" (non-OVS) MPLS code
         are not properly accounted for in mpls_gso_segment.
      
      The MPLS GSO code was added for OVS. It is re-using skb_mac_gso_segment
      to call the gso segment functions for the higher layer protocols. That
      means skb_mac_gso_segment is called twice -- once with the network
      protocol set to MPLS and again with the network protocol set to the
      inner protocol.
      
      This patch sets the inner skb protocol addressing item 1 above and sets
      the network_header and inner_network_header to mark where the MPLS labels
      start and end. The MPLS code in OVS is also updated to set the two
      network markers.
      
      >From there the MPLS GSO code uses the difference between the network
      header and the inner network header to know the size of the MPLS header
      that was pushed. It then pulls the MPLS header, resets the mac_len and
      protocol for the inner protocol and then calls skb_mac_gso_segment
      to segment the skb.
      
      Afterward the inner protocol segmentation is done the skb protocol
      is set to mpls for each segment and the network and mac headers
      restored.
      Reported-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
      Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      48d2ab60
    • Roopa Prabhu's avatar
      net: lwtunnel: Handle fragmentation · 14972cbd
      Roopa Prabhu authored
      Today mpls iptunnel lwtunnel_output redirect expects the tunnel
      output function to handle fragmentation. This is ok but can be
      avoided if we did not do the mpls output redirect too early.
      ie we could wait until ip fragmentation is done and then call
      mpls output for each ip fragment.
      
      To make this work we will need,
      1) the lwtunnel state to carry encap headroom
      2) and do the redirect to the encap output handler on the ip fragment
      (essentially do the output redirect after fragmentation)
      
      This patch adds tunnel headroom in lwtstate to make sure we
      account for tunnel data in mtu calculations during fragmentation
      and adds new xmit redirect handler to redirect to lwtunnel xmit func
      after ip fragmentation.
      
      This includes IPV6 and some mtu fixes and testing from David Ahern.
      Signed-off-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      14972cbd
    • Eric Dumazet's avatar
      net: batch calls to flush_all_backlogs() · 41852497
      Eric Dumazet authored
      After commit 145dd5f9 ("net: flush the softnet backlog in process
      context"), we can easily batch calls to flush_all_backlogs() for all
      devices processed in rollback_registered_many()
      
      Tested:
      
      Before patch, on an idle host.
      
      modprobe dummy numdummies=10000
      perf stat -e context-switches -a rmmod dummy
      
       Performance counter stats for 'system wide':
      
               1,211,798      context-switches
      
             1.302137465 seconds time elapsed
      
      After patch:
      
      perf stat -e context-switches -a rmmod dummy
      
       Performance counter stats for 'system wide':
      
                 225,523      context-switches
      
             0.721623566 seconds time elapsed
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      41852497
    • Mark Rustad's avatar
      ixgbe: Eliminate useless message and improve logic · ae3cb8cb
      Mark Rustad authored
      Remove a useless log message and improve the logic for setting
      a PHY address from the contents of the MNG_IF_SEL register.
      Signed-off-by: default avatarMark Rustad <mark.d.rustad@intel.com>
      Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
      Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ae3cb8cb
    • David S. Miller's avatar
      Merge tag 'rxrpc-rewrite-20160830-1' of... · 792438e5
      David S. Miller authored
      Merge tag 'rxrpc-rewrite-20160830-1' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
      
      David Howells says:
      
      ====================
      rxrpc: Preparation for removal of use of skbs from AFS
      
      Here's a set of patches that prepare the way for the removal of the use of
      sk_buffs from fs/afs (they'll be entirely retained within net/rxrpc):
      
       (1) Fix a potential NULL-pointer deref in rxrpc_abort_calls().
      
       (2) Condense all the terminal call state machine states to a single one
           plus supplementary info.
      
       (3) Add a trace point for rxrpc call usage debugging.
      
       (4) Cleanups and missing headers.
      
       (5) Provide a way for AFS to ask about a call's peer address without
           having an sk_buff to query.
      
       (6) Use call->peer directly rather than going via call->conn (which might
           be NULL).
      
       (7) Pass struct socket * to various rxrpc kernel interface functions so
           they can use that directly rather than getting it from the rxrpc_call
           struct.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      792438e5