From: Allan Chou <allan@asix.com.tw>

The change fixes AX88772x resume failure by
- Restore incorrect AX88772A PHY registers when resetting
- Need to stop MAC operation when suspending
- Need to restart MII when restoring PHY
Signed-off-by: NAllan Chou <allan@asix.com.tw>
Signed-off-by: NRobert Foss <robert.foss@collabora.com>
Tested-by: NRobert Foss <robert.foss@collabora.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

From: Vincent Palatin <vpalatin@chromium.org>

Check the answers from the USB stack and avoid re-sending multiple times
the request if the device has disappeared.
Signed-off-by: NVincent Palatin <vpalatin@chromium.org>
Signed-off-by: NRobert Foss <robert.foss@collabora.com>
Tested-by: NRobert Foss <robert.foss@collabora.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

From: Freddy Xin <freddy@asix.com.tw>

In order to R/W registers in suspend/resume functions, in_pm flags are
added to some functions to determine whether the nopm version of usb
functions is called.

Save BMCR and ANAR PHY registers in suspend function and restore them
in resume function.

Reset HW in resume function to ensure the PHY works correctly.
Signed-off-by: NFreddy Xin <freddy@asix.com.tw>
Signed-off-by: NRobert Foss <robert.foss@collabora.com>
Tested-by: NRobert Foss <robert.foss@collabora.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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>
Suggested-by: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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>
Suggested-by: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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>
Suggested-by: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NFeng Gao <gfree.wind@gmail.com>
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NStephen Hemminger <stephen@networkplumber.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support for the MDB operations. This consists of
loading/purging/dumping multicast addresses for a given port in the ATU.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add firmware download support for cn23xx device.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds support msix interrupt for cn23xx device.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds support for cn23xx queue manipulation.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Adds support for initializing cn23xx device registers
related to mac, input/output and pf global config.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support for cn23xx device init and sriov queue config.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support for cn23xx specific queue definitions and
features.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch adds register definitions and structures for new
device cn23xx.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add support of common irq enable functionality for both
iq(instruction queue) and oq(output queue).
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch contains changes for firmware version management.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Consolidate common functionality of various devices
from different files into lio_core.c/octeon_console.c.
Signed-off-by: NDerek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: NSatanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: NFelix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: NRaghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NJulia Lawall <Julia.Lawall@lip6.fr>
Acked-by: NMark Einon <mark.einon@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NArnd Bergmann <arnd@arndb.de>
Fixes: 68db9ec2 ("qede: Add support for per-queue stats.")
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NArnd Bergmann <arnd@arndb.de>
Fixes: 0184165b ("ravb: add sleep PM suspend/resume support")
Acked-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NLennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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: NMark Rustad <mark.d.rustad@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Trivial fix to spelling mistake in dev_warn message.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When the PF assigns a new MAC address to a VF it uses the base address
registers to store the MAC address. This allows a VF which loads after
this setup the ability to get the initial address without having to wait
for a mailbox message. Unfortunately to do this, the PF must take queue
ownership away from the VF, which can cause fault errors when there is
already an active VF driver.

This queue ownership assignment causes race condition between the PF and
the VF such that potentially a VF can cause FUM fault errors due to
normal PF/VF driver behavior.

It is not safe to simply allow the PF to write the base address
registers without taking queue ownership back as the PF must also
disable the queues, and this would impact active VF use. The current
code is safe because the queue ownership will prevent the VF from
actually writing but does trigger the FUM fault.

We can do better by simply avoiding the register write process when
a mailbox message suffices. If the message can be sent over the mailbox,
then we will not perform the queue ownership assignment and we won't
update the base address to be the same as the MAC address.

We do still have to write the TXQCTL registers in order to update the
VID of the queue. This is necessary because the TXQCTL register is
read-only from the VF, and thus the VF cannot do this for itself. This
register does not need to wait for the Tx queue to be disabled and is
safe for the PF to write during normal VF operation, so we move this
write to the top of the function above the mailbox message. Without
this, the TXQCTL register would be misconfigured and cause the VF to Tx
hang.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Ensure that other bits in the RXQCTL register do not get cleared. This
ensures that bits related to queue ownership are maintained.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Similar to how we handle VXLAN offload, enable support for a single
Geneve tunnel.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

In preparation for adding Geneve Rx offload support, refactor the
current VXLAN offload flow to be a bit more generic so that it will be
easier to add the new Geneve code. The fm10k hardware supports one VXLAN
and one Geneve tunnel, so we will eventually treat the VXLAN and Geneve
tunnels identically. To this end, factor out the code that handles the
current list so that we can use the generic flow for both tunnels in the
next patch.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

In the event of a surprise remove, we expect the driver to go down,
which includes calling .stop_hw(). However, this function will return an
error because the queues won't appear to cleanly disable. Prevent this
and avoid the unnecessary checks by just returning when
FM10K_REMOVED(hw->hw_addr) is true.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

In the event of an uncorrectable AER error occurring when the driver has
not loaded, the recovery routines are not done. This is done because
future loads of the driver may not be aware of the IO state and may not
be able to recover at all. In this case, when we next load the driver it
fails due to what appears to be a surprise remove event. Instead, add
a check to ensure that the device is in the normal IO state before
continuing to probe. This allows us to give a more descriptive message
of what is wrong.

Without this change, the driver will attempt to probe up to our first
call of .reset_hw() which will be unable to read registers and act as if
a surprise remove event occurred.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>