GitHub/LineageOS/G12/android_kernel_amlogic_linux-4.9.git
8 years agonet: asix: see 802.3 spec for phy reset
Robert Foss [Mon, 29 Aug 2016 13:32:18 +0000 (09:32 -0400)]
net: asix: see 802.3 spec for phy reset

From: Grant Grundler <grundler@chromium.org>

https://lkml.org/lkml/2014/11/11/947

Ben Hutchings is correct. IEEE 802.3 spec section "22.2.4.1.1 Reset" requires
up to 500ms delay. Mitigate the "max" delay by polling the phy until BCM_RESET
bit is clear.

Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: asix: Fix AX88772x resume failures
Robert Foss [Mon, 29 Aug 2016 13:32:17 +0000 (09:32 -0400)]
net: asix: Fix AX88772x resume failures

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: Allan Chou <allan@asix.com.tw>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: asix: Avoid looping when the device is disconnected
Robert Foss [Mon, 29 Aug 2016 13:32:16 +0000 (09:32 -0400)]
net: asix: Avoid looping when the device is disconnected

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: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: asix: Add in_pm parameter
Robert Foss [Mon, 29 Aug 2016 13:32:15 +0000 (09:32 -0400)]
net: asix: Add in_pm parameter

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: Freddy Xin <freddy@asix.com.tw>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: axienet: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 22:21:23 +0000 (00:21 +0200)]
net: axienet: constify ethtool_ops structures

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: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agor8152: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 22:21:22 +0000 (00:21 +0200)]
r8152: constify ethtool_ops structures

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: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: mediatek: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 22:21:19 +0000 (00:21 +0200)]
net: mediatek: constify ethtool_ops structures

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: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'ppp-recursion'
David S. Miller [Wed, 31 Aug 2016 21:33:09 +0000 (14:33 -0700)]
Merge branch 'ppp-recursion'

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: David S. Miller <davem@davemloft.net>
8 years agoppp: declare PPP devices as LLTX
Guillaume Nault [Sat, 27 Aug 2016 20:22:51 +0000 (22:22 +0200)]
ppp: declare PPP devices as LLTX

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: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoppp: avoid dealock on recursive xmit
Guillaume Nault [Sat, 27 Aug 2016 20:22:32 +0000 (22:22 +0200)]
ppp: avoid dealock on recursive xmit

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: Feng Gao <gfree.wind@gmail.com>
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoxgbe: constify get_netdev_ops and get_ethtool_ops
stephen hemminger [Wed, 31 Aug 2016 15:57:36 +0000 (08:57 -0700)]
xgbe: constify get_netdev_ops and get_ethtool_ops

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: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'dsa-mdb-support'
David S. Miller [Wed, 31 Aug 2016 21:15:43 +0000 (14:15 -0700)]
Merge branch 'dsa-mdb-support'

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: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: dsa: mv88e6xxx: add MDB support
Vivien Didelot [Wed, 31 Aug 2016 15:50:05 +0000 (11:50 -0400)]
net: dsa: mv88e6xxx: add MDB support

Add support for the MDB operations. This consists of
loading/purging/dumping multicast addresses for a given port in the ATU.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: dsa: mv88e6xxx: make switchdev DB ops generic
Vivien Didelot [Wed, 31 Aug 2016 15:50:04 +0000 (11:50 -0400)]
net: dsa: mv88e6xxx: make switchdev DB ops generic

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: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: dsa: add MDB support
Vivien Didelot [Wed, 31 Aug 2016 15:50:03 +0000 (11:50 -0400)]
net: dsa: add MDB support

Add SWITCHDEV_OBJ_ID_PORT_MDB support to the DSA layer.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'liquidio-CN23XX-part-1'
David S. Miller [Wed, 31 Aug 2016 21:12:49 +0000 (14:12 -0700)]
Merge branch 'liquidio-CN23XX-part-1'

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: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX firmware download
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:29 +0000 (11:03 -0700)]
liquidio: CN23XX firmware download

Add firmware download support for cn23xx device.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: MSIX support for CN23XX
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:28 +0000 (11:03 -0700)]
liquidio: MSIX support for CN23XX

This patch adds support msix interrupt for cn23xx device.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX queue manipulation
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:27 +0000 (11:03 -0700)]
liquidio: CN23XX queue manipulation

This patch adds support for cn23xx queue manipulation.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX register setup
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:26 +0000 (11:03 -0700)]
liquidio: CN23XX register setup

Adds support for initializing cn23xx device registers
related to mac, input/output and pf global config.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX device init and sriov config
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:25 +0000 (11:03 -0700)]
liquidio: CN23XX device init and sriov config

Add support for cn23xx device init and sriov queue config.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX queue definitions
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:24 +0000 (11:03 -0700)]
liquidio: CN23XX queue definitions

Add support for cn23xx specific queue definitions and
features.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: CN23XX register definitions
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:23 +0000 (11:03 -0700)]
liquidio: CN23XX register definitions

This patch adds register definitions and structures for new
device cn23xx.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: Common enable irq function
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:22 +0000 (11:03 -0700)]
liquidio: Common enable irq function

Add support of common irq enable functionality for both
iq(instruction queue) and oq(output queue).

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: Firmware version management
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:21 +0000 (11:03 -0700)]
liquidio: Firmware version management

This patch contains changes for firmware version management.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoliquidio: Consolidate common functionality
Raghu Vatsavayi [Wed, 31 Aug 2016 18:03:20 +0000 (11:03 -0700)]
liquidio: Consolidate common functionality

Consolidate common functionality of various devices
from different files into lio_core.c/octeon_console.c.

Signed-off-by: Derek Chickles <derek.chickles@caviumnetworks.com>
Signed-off-by: Satanand Burla <satananda.burla@caviumnetworks.com>
Signed-off-by: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: wan: sbni: Spelling s/acknoweledge/acknowledge/, Grammar
Geert Uytterhoeven [Wed, 31 Aug 2016 09:41:22 +0000 (11:41 +0200)]
net: wan: sbni: Spelling s/acknoweledge/acknowledge/, Grammar

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: systemport: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 07:30:48 +0000 (09:30 +0200)]
net: systemport: constify ethtool_ops structures

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: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agodwc_eth_qos: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 07:30:47 +0000 (09:30 +0200)]
dwc_eth_qos: constify ethtool_ops structures

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: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: hisilicon: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 07:30:46 +0000 (09:30 +0200)]
net: hisilicon: constify ethtool_ops structures

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: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: bcmgenet: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 07:30:45 +0000 (09:30 +0200)]
net: bcmgenet: constify ethtool_ops structures

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: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: ethernet: et131x: constify ethtool_ops structures
Julia Lawall [Wed, 31 Aug 2016 07:30:44 +0000 (09:30 +0200)]
net: ethernet: et131x: constify ethtool_ops structures

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: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoqede: hide 32-bit compile warning
Arnd Bergmann [Fri, 26 Aug 2016 15:37:53 +0000 (17:37 +0200)]
qede: hide 32-bit compile warning

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: Arnd Bergmann <arnd@arndb.de>
Fixes: 68db9ec2df07 ("qede: Add support for per-queue stats.")
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoravb: avoid unused function warnings
Arnd Bergmann [Fri, 26 Aug 2016 15:30:29 +0000 (17:30 +0200)]
ravb: avoid unused function warnings

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: Arnd Bergmann <arnd@arndb.de>
Fixes: 0184165b2f42 ("ravb: add sleep PM suspend/resume support")
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'mpls-fragmentation-and-gso-fixes'
David S. Miller [Wed, 31 Aug 2016 05:27:18 +0000 (22:27 -0700)]
Merge branch 'mpls-fragmentation-and-gso-fixes'

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: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: veth: Set features for MPLS
David Ahern [Thu, 25 Aug 2016 03:10:45 +0000 (20:10 -0700)]
net: veth: Set features for MPLS

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: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: mpls: Fixups for GSO
David Ahern [Thu, 25 Aug 2016 03:10:44 +0000 (20:10 -0700)]
net: mpls: Fixups for GSO

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: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: lwtunnel: Handle fragmentation
Roopa Prabhu [Thu, 25 Aug 2016 03:10:43 +0000 (20:10 -0700)]
net: lwtunnel: Handle fragmentation

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: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: batch calls to flush_all_backlogs()
Eric Dumazet [Fri, 26 Aug 2016 19:50:39 +0000 (12:50 -0700)]
net: batch calls to flush_all_backlogs()

After commit 145dd5f9c88f ("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: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoixgbe: Eliminate useless message and improve logic
Mark Rustad [Tue, 30 Aug 2016 18:33:43 +0000 (11:33 -0700)]
ixgbe: Eliminate useless message and improve logic

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: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge tag 'rxrpc-rewrite-20160830-1' of git://git.kernel.org/pub/scm/linux/kernel...
David S. Miller [Wed, 31 Aug 2016 05:08:52 +0000 (22:08 -0700)]
Merge tag 'rxrpc-rewrite-20160830-1' of git://git./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: David S. Miller <davem@davemloft.net>
8 years agodrivers: net: stmmac: fix spelling mistake "mulitcast" -> "multicast"
Colin Ian King [Fri, 26 Aug 2016 18:35:25 +0000 (19:35 +0100)]
drivers: net: stmmac: fix spelling mistake "mulitcast" -> "multicast"

Trivial fix to spelling mistake in dev_warn message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agorxrpc: Pass struct socket * to more rxrpc kernel interface functions
David Howells [Tue, 30 Aug 2016 11:00:48 +0000 (12:00 +0100)]
rxrpc: Pass struct socket * to more rxrpc kernel interface functions

Pass struct socket * to more rxrpc kernel interface functions.  They should
be starting from this rather than the socket pointer in the rxrpc_call
struct if they need to access the socket.

I have left:

rxrpc_kernel_is_data_last()
rxrpc_kernel_get_abort_code()
rxrpc_kernel_get_error_number()
rxrpc_kernel_free_skb()
rxrpc_kernel_data_consumed()

unmodified as they're all about to be removed (and, in any case, don't
touch the socket).

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agorxrpc: Use call->peer rather than going to the connection
David Howells [Tue, 30 Aug 2016 11:36:06 +0000 (12:36 +0100)]
rxrpc: Use call->peer rather than going to the connection

Use call->peer rather than call->conn->params.peer as call->conn may become
NULL.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agorxrpc: Provide a way for AFS to ask for the peer address of a call
David Howells [Tue, 30 Aug 2016 08:49:29 +0000 (09:49 +0100)]
rxrpc: Provide a way for AFS to ask for the peer address of a call

Provide a function so that kernel users, such as AFS, can ask for the peer
address of a call:

   void rxrpc_kernel_get_peer(struct rxrpc_call *call,
      struct sockaddr_rxrpc *_srx);

In the future the kernel service won't get sk_buffs to look inside.
Further, this allows us to hide any canonicalisation inside AF_RXRPC for
when IPv6 support is added.

Also propagate this through to afs_find_server() and issue a warning if we
can't handle the address family yet.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agoafs: Need linux/random.h
David Howells [Tue, 30 Aug 2016 15:05:14 +0000 (16:05 +0100)]
afs: Need linux/random.h

We should #include linux/random.h to use get_random().

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agoafs: Miscellaneous simple cleanups
David Howells [Tue, 30 Aug 2016 08:49:29 +0000 (09:49 +0100)]
afs: Miscellaneous simple cleanups

Remove one #ifndef'd-out variable and a couple of excessive blank lines.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agorxrpc: Trace rxrpc_call usage
David Howells [Tue, 30 Aug 2016 08:49:29 +0000 (09:49 +0100)]
rxrpc: Trace rxrpc_call usage

Add a trace event for debuging rxrpc_call struct usage.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agorxrpc: Calls should only have one terminal state
David Howells [Tue, 30 Aug 2016 08:49:28 +0000 (09:49 +0100)]
rxrpc: Calls should only have one terminal state

Condense the terminal states of a call state machine to a single state,
plus a separate completion type value.  The value is then set, along with
error and abort code values, only when the call is transitioned to the
completion state.

Helpers are provided to simplify this.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agorxrpc: Fix a potential NULL-pointer deref in rxrpc_abort_calls
David Howells [Tue, 30 Aug 2016 08:49:28 +0000 (09:49 +0100)]
rxrpc: Fix a potential NULL-pointer deref in rxrpc_abort_calls

The call pointer in a channel on a connection will be NULL if there's no
active call on that channel.  rxrpc_abort_calls() needs to check for this
before trying to take the call's state_lock.

Signed-off-by: David Howells <dhowells@redhat.com>
8 years agoMerge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next...
David S. Miller [Tue, 30 Aug 2016 05:52:09 +0000 (01:52 -0400)]
Merge branch '100GbE' of git://git./linux/kernel/git/jkirsher/next-queue

Jeff Kirsher says:

====================
100GbE Intel Wired LAN Driver Updates 2016-08-29

This series contains updates to fm10k only.

Jake provides all the changes in this series starting with fixes an issue
where VF devices may fail during an unbind/bind and we will never zero
the reference counter for the pci_dev structure.  Updated the hot path
to use SW counters instead of checking for hardware Tx pending for
possible transmit hangs, which will improve performance.  Fixed the NAPI
budget accounting so that fm10k_poll will return actual work done,
capped at (budget - 1) instead of returning 0.  Added a check to ensure
that the device is in the normal IO state before continuing to probe,
which allows us to give a more descriptive message of what is wrong
in the case of uncorrectable AER error.  In preparation for adding Geneve
Rx offload support, refactored the current VXLAN offload flow to be a bit
more generic.  Added support for receive offloads on one Geneve tunnel.
Ensure that other bits in the RXQCTL register do not get cleared, to
make sure that bits related to queue ownership are maintained.  Fixed
an issue in queue ownership assignment which casued a race condition
between the PF and the VF such that potentially a VF could cause FUM
fault errors due to normal PF/VF driver behavior.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
David S. Miller [Tue, 30 Aug 2016 04:54:02 +0000 (00:54 -0400)]
Merge git://git./linux/kernel/git/davem/net

All three conflicts were cases of simple overlapping
changes.

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge tag 'hwmon-for-linus-v4.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Tue, 30 Aug 2016 02:12:35 +0000 (19:12 -0700)]
Merge tag 'hwmon-for-linus-v4.8-rc5' of git://git./linux/kernel/git/groeck/linux-staging

Pull hwmon fix from Guenter Roeck:
 "Add missing sysfs attribute group terminator to it87 driver"

* tag 'hwmon-for-linus-v4.8-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (it87) Add missing sysfs attribute group terminator

8 years agoMerge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Mon, 29 Aug 2016 19:37:11 +0000 (12:37 -0700)]
Merge tag 'ext4_for_linus_stable' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
 "Fix bugs that could cause kernel deadlocks or file system corruption
  while moving xattrs to expand the extended inode.

  Also add some sanity checks to the block group descriptors to make
  sure we don't end up overwriting the superblock"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: avoid deadlock when expanding inode size
  ext4: properly align shifted xattrs when expanding inodes
  ext4: fix xattr shifting when expanding inodes part 2
  ext4: fix xattr shifting when expanding inodes
  ext4: validate that metadata blocks do not overlap superblock
  ext4: reserve xattr index for the Hurd

8 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Mon, 29 Aug 2016 19:29:13 +0000 (12:29 -0700)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Segregate namespaces properly in conntrack dumps, from Liping Zhang.

 2) tcp listener refcount fix in netfilter tproxy, from Eric Dumazet.

 3) Fix timeouts in qed driver due to xmit_more, from Yuval Mintz.

 4) Fix use-after-free in tcp_xmit_retransmit_queue().

 5) Userspace header fixups (use of __u32, missing includes, etc.) from
    Mikko Rapeli.

 6) Further refinements to fragmentation wrt gso and tunnels, from
    Shmulik Ladkani.

 7) Trigger poll correctly for zero length UDP packets, from Eric
    Dumazet.

 8) TCP window scaling fix, also from Eric Dumazet.

 9) SLAB_DESTROY_BY_RCU is not relevant any more for UDP sockets.

10) Module refcount leak in qdisc_create_dflt(), from Eric Dumazet.

11) Fix deadlock in cp_rx_poll() of 8139cp driver, from Gao Feng.

12) Memory leak in rhashtable's alloc_bucket_locks(), from Eric Dumazet.

13) Add new device ID to alx driver, from Owen Lin.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (83 commits)
  Add Killer E2500 device ID in alx driver.
  net: smc91x: fix SMC accesses
  Documentation: networking: dsa: Remove platform device TODO
  net/mlx5: Increase number of ethtool steering priorities
  net/mlx5: Add error prints when validate ETS failed
  net/mlx5e: Fix memory leak if refreshing TIRs fails
  net/mlx5e: Add ethtool counter for TX xmit_more
  net/mlx5e: Fix ethtool -g/G rx ring parameter report with striding RQ
  net/mlx5e: Don't wait for SQ completions on close
  net/mlx5e: Don't post fragmented MPWQE when RQ is disabled
  net/mlx5e: Don't wait for RQ completions on close
  net/mlx5e: Limit UMR length to the device's limitation
  rhashtable: fix a memory leak in alloc_bucket_locks()
  sfc: fix potential stack corruption from running past stat bitmask
  team: loadbalance: push lacpdus to exact delivery
  net: hns: dereference ppe_cb->ppe_common_cb if it is non-null
  8139cp: Fix one possible deadloop in cp_rx_poll
  i40e: Change some init flow for the client
  Revert "phy: IRQ cannot be shared"
  net: dsa: bcm_sf2: Fix race condition while unmasking interrupts
  ...

8 years agoMerge tag 'platform-drivers-x86-v4.8-4' of git://git.infradead.org/users/dvhart/linux...
Linus Torvalds [Mon, 29 Aug 2016 19:20:22 +0000 (12:20 -0700)]
Merge tag 'platform-drivers-x86-v4.8-4' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform driver fixes from Darren Hart:
 "Remove module related code from two drivers that are only configurable
  as built-in: intel_pmic_gpio and platform/olpc"

* tag 'platform-drivers-x86-v4.8-4' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
  intel_pmic_gpio: Make explicitly non-modular
  platform/olpc: Make ec explicitly non-modular

8 years agoMerge tag 'powerpc-4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Mon, 29 Aug 2016 19:12:15 +0000 (12:12 -0700)]
Merge tag 'powerpc-4.8-4' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Ben Herrenschmidt:
 "This was meant to be sent early last week, but I has a change pending
  on one of the fixes and other things made me forget all about.  Ugh.

  We have some misc fixes for powerpc 4.8.  Some trivial bits and some
  regressions, and a trivial cleanup or two that I saw no point in
  letting rot in patchwork"

* tag 'powerpc-4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc: signals: Discard transaction state from signal frames
  powerpc/powernv : Drop reference added by kset_find_obj()
  powerpc/tm: do not use r13 for tabort_syscall
  powerpc: move hmi.c to arch/powerpc/kvm/
  powerpc: sysdev: cpm: fix gpio save_regs functions
  powerpc/pseries: PACA save area fix for MCE vs MCE
  powerpc/pseries: PACA save area fix for general exception vs MCE
  powerpc/prom: Fix sub-processor option passed to ibm, client-architecture-support
  powerpc, hotplug: Avoid to touch non-existent cpumasks.
  powerpc: migrate exception table users off module.h and onto extable.h
  powerpc/powernv/pci: fix iterator signedness
  powerpc/pseries: use pci_host_bridge.release_fn() to kfree(phb)
  cxl: use pcibios_free_controller_deferred() when removing vPHBs
  powerpc: mpc8349emitx: Delete unnecessary assignment for the field "owner"
  powerpc/512x: Delete unnecessary assignment for the field "owner"
  drivers/macintosh: Delete owner assignment
  powerpc: cputhreads: Add missing include file

8 years agohwmon: (it87) Add missing sysfs attribute group terminator
Jean Delvare [Mon, 29 Aug 2016 11:18:23 +0000 (13:18 +0200)]
hwmon: (it87) Add missing sysfs attribute group terminator

Attribute array it87_attributes_in lacks its NULL terminator,
causing random behavior when operating on the attribute group.

Fixes: 52929715634a ("hwmon: (it87) Use is_visible for voltage sensors")
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
8 years agofm10k: don't re-map queues when a mailbox message suffices
Jacob Keller [Tue, 9 Aug 2016 00:08:19 +0000 (17:08 -0700)]
fm10k: don't re-map queues when a mailbox message suffices

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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: don't clear the RXQCTL register when enabling or disabling queues
Jacob Keller [Wed, 3 Aug 2016 22:05:27 +0000 (15:05 -0700)]
fm10k: don't clear the RXQCTL register when enabling or disabling queues

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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: remove unnecessary extra parenthesis around ((~value))
Jacob Keller [Fri, 22 Jul 2016 23:00:37 +0000 (16:00 -0700)]
fm10k: remove unnecessary extra parenthesis around ((~value))

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: add support for Rx offloads on one Geneve tunnel
Jacob Keller [Thu, 23 Jun 2016 20:54:03 +0000 (13:54 -0700)]
fm10k: add support for Rx offloads on one Geneve tunnel

Similar to how we handle VXLAN offload, enable support for a single
Geneve tunnel.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: rework vxlan_port offload before adding geneve support
Jacob Keller [Fri, 26 Aug 2016 07:14:34 +0000 (00:14 -0700)]
fm10k: rework vxlan_port offload before adding geneve support

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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: don't try to stop queues if we've lost hw_addr
Jacob Keller [Thu, 23 Jun 2016 20:54:01 +0000 (13:54 -0700)]
fm10k: don't try to stop queues if we've lost hw_addr

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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: don't continue probe if PCI device not in normal IO state
Jacob Keller [Thu, 23 Jun 2016 20:31:01 +0000 (13:31 -0700)]
fm10k: don't continue probe if PCI device not in normal IO state

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: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: print error code when pci_enable_device_mem fails during probe
Jacob Keller [Thu, 23 Jun 2016 20:31:00 +0000 (13:31 -0700)]
fm10k: print error code when pci_enable_device_mem fails during probe

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: NAPI polling routine must return actual work done
Jacob Keller [Mon, 20 Jun 2016 17:39:32 +0000 (10:39 -0700)]
fm10k: NAPI polling routine must return actual work done

When fm10k_poll fully cleans rings it returns 0. This is incorrect as it
messes up the budget accounting in the core NAPI code. Fix this by
returning actual work done, capped at budget - 1 since the core doesn't
expect a return of the full budget when the driver modifies the NAPI
status.

Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Venkatesh Srinivas <venkateshs@google.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: prefer READ_ONCE instead of ACCESS_ONCE
Jacob Keller [Fri, 17 Jun 2016 23:21:11 +0000 (16:21 -0700)]
fm10k: prefer READ_ONCE instead of ACCESS_ONCE

While technically not needed, as all our uses of ACCESS_ONCE are scalar
types, we already use READ_ONCE in a few places, and for code
readability we can swap all the uses of the older ACCESS_ONCE into
READ_ONCE.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: remove fm10k_get_reta_size from namespace
Jacob Keller [Fri, 17 Jun 2016 21:36:45 +0000 (14:36 -0700)]
fm10k: remove fm10k_get_reta_size from namespace

The function is only used in fm10k_ethtool.c, so make it static.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: use variadic form of alloc_workqueue
Jacob Keller [Thu, 9 Jun 2016 22:42:36 +0000 (15:42 -0700)]
fm10k: use variadic form of alloc_workqueue

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: use software values when checking for Tx hangs in hot path
Jacob Keller [Thu, 9 Jun 2016 21:56:05 +0000 (14:56 -0700)]
fm10k: use software values when checking for Tx hangs in hot path

A previous patch added support to check for hardware Tx pending in the
fm10k_down routine. This support was intended to ensure that we
accurately check what the hardware state is. However, checking for Tx
hangs in this manor during the hotpath results in a large performance
hit. Avoid this by making the hotpath check use the SW counters instead.

Fixes: a0f53cf49cb0 ("fm10k: use actual hardware registers when checking for pending Tx", 2016-06-08)
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agofm10k: fix PCI device enable_cnt leak in .io_slot_reset
Jacob Keller [Thu, 9 Jun 2016 19:02:03 +0000 (12:02 -0700)]
fm10k: fix PCI device enable_cnt leak in .io_slot_reset

A previous patch removed the pci_disable_device() call in
.io_error_detected. This call corresponded to a pci_enable_device_mem()
call within .io_slot_reset handler. Change the call here to
a pci_reenable_device() so that it does not increment and leak the
enable_cnt reference count for the device. Without this change, VF
devices may fail during an unbind/bind, and we'll never zero the
reference counter for the pci_dev structure.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
8 years agointel_pmic_gpio: Make explicitly non-modular
Paul Gortmaker [Mon, 15 Aug 2016 22:24:59 +0000 (18:24 -0400)]
intel_pmic_gpio: Make explicitly non-modular

The Kconfig entry controlling compilation of this code is:

drivers/platform/x86/Kconfig:config GPIO_INTEL_PMIC
drivers/platform/x86/Kconfig:   bool "Intel PMIC GPIO support"

...meaning that it currently is not being built as a module by anyone.

Lets remove the couple traces of modular infrastructure use, so that
when reading the driver there is no doubt it is builtin-only.

We delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.

We don't replace module.h with init.h since the file already has that.

Cc: Alek Du <alek.du@intel.com>
Cc: platform-driver-x86@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
8 years agoplatform/olpc: Make ec explicitly non-modular
Paul Gortmaker [Mon, 15 Aug 2016 22:25:17 +0000 (18:25 -0400)]
platform/olpc: Make ec explicitly non-modular

The Kconfig entry controlling compilation of this code is:

arch/x86/Kconfig:config OLPC
arch/x86/Kconfig:       bool "One Laptop Per Child support"

...meaning that it currently is not being built as a module by anyone.

Lets remove the couple traces of modular infrastructure use, so that
when reading the driver there is no doubt it is builtin-only.

We delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.

Cc: platform-driver-x86@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
8 years agonet_sched: fix use of uninitialized ethertype variable in cls_flower
Arnd Bergmann [Fri, 26 Aug 2016 15:25:45 +0000 (17:25 +0200)]
net_sched: fix use of uninitialized ethertype variable in cls_flower

The addition of VLAN support caused a possible use of uninitialized
data if we encounter a zero TCA_FLOWER_KEY_ETH_TYPE key, as pointed
out by "gcc -Wmaybe-uninitialized":

net/sched/cls_flower.c: In function 'fl_change':
net/sched/cls_flower.c:366:22: error: 'ethertype' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This changes the code to only set the ethertype field if it
was nonzero, as before the patch.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 9399ae9a6cb2 ("net_sched: flower: Add vlan support")
Cc: Hadar Hen Zion <hadarh@mellanox.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/xgene: fix error handling during reset
Arnd Bergmann [Fri, 26 Aug 2016 15:25:46 +0000 (17:25 +0200)]
net/xgene: fix error handling during reset

The newly added reset logic uses helper functions for the MMIO that
may fail. However, when the read operation fails, we end up writing
back uninitialized data to the register, as gcc warns:

drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c: In function 'xgene_enet_link_state':
drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c:213:2: error: 'data' may be used uninitialized in this function [-Werror=maybe-uninitialized]
drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c:209:6: note: 'data' was declared here
  u32 data;

We already print a warning to the console log if that happens,
the best alternative that I can see is skip the rest of the reset
sequence if the register value cannot be read: Most likely the
write would fail as well, and if it succeeded, worse things could
happen.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 3eb7cb9dc946 ("drivers: net: xgene: XFI PCS reset when link is down")
Cc: Fushen Chen <fchen@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: ethtool: add support for 1000BaseX and missing 10G link modes
Vidya Sagar Ravipati [Fri, 26 Aug 2016 08:25:50 +0000 (01:25 -0700)]
net: ethtool: add support for 1000BaseX and missing 10G link modes

This patch enhances ethtool link mode bitmap to include
missing interface modes for 1G/10G speeds

Changes:
1000baseX is the mode introduced to cover all 1G Fiber cases.
All modes under 1000BaseX i.e. 1000BASE-SX, 1000BASE-LX, 1000BASE-LX10
and 1000BASE-BX10 are not explicitly defined at this moment.
10G CR,SR,LR and ER link modes are included for 10G speed..

Issue:
ethtool on  1G/10G SFP port reports Base-T
as this port supports 1000baseX,10G CR, SR and LR modes.

root@tor-02$ ethtool swp1
Settings for swp1:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseT/Full
                                10000baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Advertised link modes:  1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: off
        Current message level: 0x00000000 (0)

        Link detected: yes

After fix:
root@tor-02$ ethtool swp1
Settings for swp1:
        Supported ports: [ FIBRE ]
        Supported link modes:   1000baseX/Full
                                10000baseCR/Full
                                10000baseSR/Full
                                10000baseLR/Full
                                10000baseER/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Advertised link modes:  1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Speed: 10000Mb/s
        Duplex: Full
        Port: FIBRE
        PHYAD: 0
        Transceiver: external
        Auto-negotiation: off
        Current message level: 0x00000000 (0)
        Link detected: yes

Signed-off-by: Vidya Sagar Ravipati <vidya@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoamd-xgbe: Reset running devices after resume from hibernate
James Morse [Fri, 26 Aug 2016 08:21:23 +0000 (09:21 +0100)]
amd-xgbe: Reset running devices after resume from hibernate

After resume from hibernate on arm64, any amd-xgbe devices that were
running when we hibernated are reported as down, even when it is not.

Re-plugging the cables does not cause the interface to come back, the
link must be marked as down then up via 'ip set link' using the serial
console.

This happens because the device has been power-cycled and possibly
re-initialised by firmware, whereas the driver's memory structures have
been restored from the hibernate image and the two do not agree.

Schedule a restart of the device after powerup in case the world changed
while we were asleep.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoAdd Killer E2500 device ID in alx driver.
Owen Lin [Fri, 26 Aug 2016 05:49:09 +0000 (13:49 +0800)]
Add Killer E2500 device ID in alx driver.

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agotcp: add tcp_add_backlog()
Eric Dumazet [Sat, 27 Aug 2016 14:37:54 +0000 (07:37 -0700)]
tcp: add tcp_add_backlog()

When TCP operates in lossy environments (between 1 and 10 % packet
losses), many SACK blocks can be exchanged, and I noticed we could
drop them on busy senders, if these SACK blocks have to be queued
into the socket backlog.

While the main cause is the poor performance of RACK/SACK processing,
we can try to avoid these drops of valuable information that can lead to
spurious timeouts and retransmits.

Cause of the drops is the skb->truesize overestimation caused by :

- drivers allocating ~2048 (or more) bytes as a fragment to hold an
  Ethernet frame.

- various pskb_may_pull() calls bringing the headers into skb->head
  might have pulled all the frame content, but skb->truesize could
  not be lowered, as the stack has no idea of each fragment truesize.

The backlog drops are also more visible on bidirectional flows, since
their sk_rmem_alloc can be quite big.

Let's add some room for the backlog, as only the socket owner
can selectively take action to lower memory needs, like collapsing
receive queues or partial ofo pruning.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: smc91x: fix SMC accesses
Russell King [Sat, 27 Aug 2016 16:33:03 +0000 (17:33 +0100)]
net: smc91x: fix SMC accesses

Commit b70661c70830 ("net: smc91x: use run-time configuration on all ARM
machines") broke some ARM platforms through several mistakes.  Firstly,
the access size must correspond to the following rule:

(a) at least one of 16-bit or 8-bit access size must be supported
(b) 32-bit accesses are optional, and may be enabled in addition to
    the above.

Secondly, it provides no emulation of 16-bit accesses, instead blindly
making 16-bit accesses even when the platform specifies that only 8-bit
is supported.

Reorganise smc91x.h so we can make use of the existing 16-bit access
emulation already provided - if 16-bit accesses are supported, use
16-bit accesses directly, otherwise if 8-bit accesses are supported,
use the provided 16-bit access emulation.  If neither, BUG().  This
exactly reflects the driver behaviour prior to the commit being fixed.

Since the conversion incorrectly cut down the available access sizes on
several platforms, we also need to go through every platform and fix up
the overly-restrictive access size: Arnd assumed that if a platform can
perform 32-bit, 16-bit and 8-bit accesses, then only a 32-bit access
size needed to be specified - not so, all available access sizes must
be specified.

This likely fixes some performance regressions in doing this: if a
platform does not support 8-bit accesses, 8-bit accesses have been
emulated by performing a 16-bit read-modify-write access.

Tested on the Intel Assabet/Neponset platform, which supports only 8-bit
accesses, which was broken by the original commit.

Fixes: b70661c70830 ("net: smc91x: use run-time configuration on all ARM machines")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoDocumentation: networking: dsa: Remove platform device TODO
Florian Fainelli [Sat, 27 Aug 2016 22:34:20 +0000 (15:34 -0700)]
Documentation: networking: dsa: Remove platform device TODO

Since commit 83c0afaec7b7 ("net: dsa: Add new binding implementation"),
the shortcomings of the dsa platform device have been addressed, remove
that TODO item.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agocxgb4/cxgb4vf: fix spelling mistake "provissioned" -> "provisioned"
Colin Ian King [Sun, 28 Aug 2016 11:07:02 +0000 (12:07 +0100)]
cxgb4/cxgb4vf: fix spelling mistake "provissioned" -> "provisioned"

Trivial fix to spelling mistake in dev_warn message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: ucc_geth: fix spelling mistake "propperty" -> "property"
Colin Ian King [Sun, 28 Aug 2016 11:03:27 +0000 (12:03 +0100)]
net: ucc_geth: fix spelling mistake "propperty" -> "property"

Trivial fix to spelling mistake in dev_warn message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agowan/fsl_ucc_hdlc: fix spelling mistake "prameter" -> "parameter"
Colin Ian King [Sun, 28 Aug 2016 10:40:41 +0000 (11:40 +0100)]
wan/fsl_ucc_hdlc: fix spelling mistake "prameter" -> "parameter"

Trivial fix to spelling mistake in dev_err message.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'strp-generalization'
David S. Miller [Mon, 29 Aug 2016 03:32:58 +0000 (23:32 -0400)]
Merge branch 'strp-generalization'

Tom Herbert says:

====================
strp: Generalize stream parser to work with other socket types

Add a read_sock protocol operation function that allows something like
tcp_read_sock to be called for other protocol types.

Specific changes in this patch set:
  - Add read_sock function to proto_ops. This has the same signature as
    tcp_read_sock. sk_read_actor_t is also defined in net.h.
  - Set peek_len and read_sock proto_op functions for TCPv4 and TCPv6
    stream ops.
  - Remove references to tcp in strparser.
  - Call peek_len and read_sock operations from strparser instead of
    calling TCP specific functions.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agokcm: Remove TCP specific references from kcm and strparser
Tom Herbert [Sun, 28 Aug 2016 21:43:19 +0000 (14:43 -0700)]
kcm: Remove TCP specific references from kcm and strparser

kcm and strparser need to work with any type of stream socket not just
TCP. Eliminate references to TCP and call generic proto_ops functions of
read_sock and peek_len. Also in strp_init check if the socket support
the proto_ops read_sock and peek_len.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agotcp: Set read_sock and peek_len proto_ops
Tom Herbert [Sun, 28 Aug 2016 21:43:18 +0000 (14:43 -0700)]
tcp: Set read_sock and peek_len proto_ops

In inet_stream_ops we set read_sock to tcp_read_sock and peek_len to
tcp_peek_len (which is just a stub function that calls tcp_inq).

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet: Add read_sock proto_op
Tom Herbert [Sun, 28 Aug 2016 21:43:17 +0000 (14:43 -0700)]
net: Add read_sock proto_op

Add new function in proto_ops structure. This includes moving the
typedef got sk_read_actor into net.h and removing the definition from
tcp.h.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agoMerge branch 'mlx5-series'
David S. Miller [Mon, 29 Aug 2016 03:24:24 +0000 (23:24 -0400)]
Merge branch 'mlx5-series'

Saeed Mahameed says:

====================
Mellanox 100G mlx5 fixes 2016-08-29

This series contains some bug fixes for the mlx5 core and mlx5
ethernet driver.

From Saeed, Fix UMR to consider hardware translation table field
size limitation when calculating the maximum number of MTTs required
by the driver.  Three patches to speed-up netdevice close time by
serializing channel (SQs & RQs) destruction rather than issuing and
waiting for hardware interrupts to free them.

From Eran, Fix ethtool ring parameter reporting for striding RQ layout.
Add error prints on ETS validation failure.

From Kamal, Fix memory leak on error flow.

From Maor, Fix ethtool steering priorities number.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5: Increase number of ethtool steering priorities
Maor Gottlieb [Sun, 28 Aug 2016 22:13:50 +0000 (01:13 +0300)]
net/mlx5: Increase number of ethtool steering priorities

Ethtool has 11 flow tables, each flow table has its own priority.
Increase the number of priorities to be aligned with the number of flow
tables.

Fixes: 1174fce8d141 ('net/mlx5e: Support l3/l4 flow type specs in ethtool flow steering')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5: Add error prints when validate ETS failed
Eran Ben Elisha [Sun, 28 Aug 2016 22:13:49 +0000 (01:13 +0300)]
net/mlx5: Add error prints when validate ETS failed

Upon set ETS failure due to user invalid input, add error prints to
specify the exact error to the user.

Fixes: cdcf11212b22 ('net/mlx5e: Validate BW weight values of ETS')
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Fix memory leak if refreshing TIRs fails
Kamal Heib [Sun, 28 Aug 2016 22:13:48 +0000 (01:13 +0300)]
net/mlx5e: Fix memory leak if refreshing TIRs fails

Free 'in' command object also when mlx5_core_modify_tir fails.

Fixes: 724b2aa15126 ("net/mlx5e: TIRs management refactoring")
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Add ethtool counter for TX xmit_more
Tariq Toukan [Sun, 28 Aug 2016 22:13:47 +0000 (01:13 +0300)]
net/mlx5e: Add ethtool counter for TX xmit_more

Add a counter in ethtool for the number of times that
TX xmit_more was used.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Fix ethtool -g/G rx ring parameter report with striding RQ
Eran Ben Elisha [Sun, 28 Aug 2016 22:13:46 +0000 (01:13 +0300)]
net/mlx5e: Fix ethtool -g/G rx ring parameter report with striding RQ

The driver RQ has two possible configurations: striding RQ and
non-striding RQ.  Until this patch, the driver always reported the
number of hardware WQEs (ring descriptors). For non striding RQ
configuration, this was OK since we have one WQE per pending packet
For striding RQ, multiple packets can fit into one WQE. For better
user experience we normalize the rx_pending parameter (size of wqe/mtu)
as the average ring size in case of striding RQ.

Fixes: 461017cb006a ('net/mlx5e: Support RX multi-packet WQE ...')
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Don't wait for SQ completions on close
Saeed Mahameed [Sun, 28 Aug 2016 22:13:45 +0000 (01:13 +0300)]
net/mlx5e: Don't wait for SQ completions on close

Instead of asking the firmware to flush the SQ (Send Queue) via
asynchronous completions when moved to error, we handle SQ flush
manually (mlx5e_free_tx_descs) same as we did when SQ flush got
timed out or on tx_timeout.

This will reduce SQs flush time and speedup interface down procedure.

Moved mlx5e_free_tx_descs to the end of en_tx.c for tx
critical code locality.

Fixes: 29429f3300a3 ('net/mlx5e: Timeout if SQ doesn't flush during close')
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Don't post fragmented MPWQE when RQ is disabled
Saeed Mahameed [Sun, 28 Aug 2016 22:13:44 +0000 (01:13 +0300)]
net/mlx5e: Don't post fragmented MPWQE when RQ is disabled

ICO (Internal control operations) SQ (Send Queue) is closed/disabled
after RQ (Receive Queue).  After RQ is closed an ICO SQ completion
might post a fragmented MPWQE (Multi Packet Work Queue Element) into
that RQ.

As on regular RQ post, check if we are allowed to post to that
RQ (RQ is enabled). Cleanup in-progress UMR MPWQE on mlx5e_free_rx_descs
if needed.

Fixes: bc77b240b3c5 ('net/mlx5e: Add fragmented memory support for RX multi packet WQE')
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Don't wait for RQ completions on close
Saeed Mahameed [Sun, 28 Aug 2016 22:13:43 +0000 (01:13 +0300)]
net/mlx5e: Don't wait for RQ completions on close

This will significantly reduce receive queue flush time on interface
down.

Instead of asking the firmware to flush the RQ (Receive Queue) via
asynchronous completions when moved to error, we handle RQ flush
manually (mlx5e_free_rx_descs) same as we did when RQ flush got timed
out.

This will reduce RQs flush time and speedup interface down procedure
(ifconfig down) from 6 sec to 0.3 sec on a 48 cores system.

Moved mlx5e_free_rx_descs en_main.c where it is needed, to keep en_rx.c
free form non critical data path code for better code locality.

Fixes: 6cd392a082de ('net/mlx5e: Handle RQ flush in error cases')
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agonet/mlx5e: Limit UMR length to the device's limitation
Saeed Mahameed [Sun, 28 Aug 2016 22:13:42 +0000 (01:13 +0300)]
net/mlx5e: Limit UMR length to the device's limitation

ConnectX-4 UMR (User Memory Region) MTT translation table offset in WQE
is limited to U16_MAX, before this patch we ignored that limitation and
requested the maximum possible UMR translation length that the netdev
might need (MAX channels * MAX pages per channel).
In case of a system with #cores > 32 and when linear WQE allocation fails,
falling back to using UMR WQEs will cause the RQ (Receive Queue) to get
stuck.

Here we limit UMR length to min(U16_MAX, max required pages) (while
considering the required alignments) on driver load, by default U16_MAX is
sufficient since the default RX rings value guarantees that we are in
range, dynamically (on set_ringparam/set_channels) we will check if the
new required UMR length (num mtts) is still in range, if not, fail the
request.

Fixes: bc77b240b3c5 ('net/mlx5e: Add fragmented memory support for RX multi packet WQE')
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
8 years agopowerpc: signals: Discard transaction state from signal frames
Cyril Bur [Tue, 23 Aug 2016 00:46:17 +0000 (10:46 +1000)]
powerpc: signals: Discard transaction state from signal frames

Userspace can begin and suspend a transaction within the signal
handler which means they might enter sys_rt_sigreturn() with the
processor in suspended state.

sys_rt_sigreturn() wants to restore process context (which may have
been in a transaction before signal delivery). To do this it must
restore TM SPRS. To achieve this, any transaction initiated within the
signal frame must be discarded in order to be able to restore TM SPRs
as TM SPRs can only be manipulated non-transactionally..
>From the PowerPC ISA:
  TM Bad Thing Exception [Category: Transactional Memory]
   An attempt is made to execute a mtspr targeting a TM register in
   other than Non-transactional state.

Not doing so results in a TM Bad Thing:
[12045.221359] Kernel BUG at c000000000050a40 [verbose debug info unavailable]
[12045.221470] Unexpected TM Bad Thing exception at c000000000050a40 (msr 0x201033)
[12045.221540] Oops: Unrecoverable exception, sig: 6 [#1]
[12045.221586] SMP NR_CPUS=2048 NUMA PowerNV
[12045.221634] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE
 nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter
 ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables kvm_hv kvm
 uio_pdrv_genirq ipmi_powernv uio powernv_rng ipmi_msghandler autofs4 ses enclosure
 scsi_transport_sas bnx2x ipr mdio libcrc32c
[12045.222167] CPU: 68 PID: 6178 Comm: sigreturnpanic Not tainted 4.7.0 #34
[12045.222224] task: c0000000fce38600 ti: c0000000fceb4000 task.ti: c0000000fceb4000
[12045.222293] NIP: c000000000050a40 LR: c0000000000163bc CTR: 0000000000000000
[12045.222361] REGS: c0000000fceb7ac0 TRAP: 0700   Not tainted (4.7.0)
[12045.222418] MSR: 9000000300201033 <SF,HV,ME,IR,DR,RI,LE,TM[SE]> CR: 28444280  XER: 20000000
[12045.222625] CFAR: c0000000000163b8 SOFTE: 0 PACATMSCRATCH: 900000014280f033
GPR00: 01100000b8000001 c0000000fceb7d40 c00000000139c100 c0000000fce390d0
GPR04: 900000034280f033 0000000000000000 0000000000000000 0000000000000000
GPR08: 0000000000000000 b000000000001033 0000000000000001 0000000000000000
GPR12: 0000000000000000 c000000002926400 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 00003ffff98cadd0 00003ffff98cb470 0000000000000000
GPR28: 900000034280f033 c0000000fceb7ea0 0000000000000001 c0000000fce390d0
[12045.223535] NIP [c000000000050a40] tm_restore_sprs+0xc/0x1c
[12045.223584] LR [c0000000000163bc] tm_recheckpoint+0x5c/0xa0
[12045.223630] Call Trace:
[12045.223655] [c0000000fceb7d80] [c000000000026e74] sys_rt_sigreturn+0x494/0x6c0
[12045.223738] [c0000000fceb7e30] [c0000000000092e0] system_call+0x38/0x108
[12045.223806] Instruction dump:
[12045.223841] 7c800164 4e800020 7c0022a6 f80304a8 7c0222a6 f80304b0 7c0122a6 f80304b8
[12045.223955] 4e800020 e80304a8 7c0023a6 e80304b0 <7c0223a6e80304b8 7c0123a6 4e800020
[12045.224074] ---[ end trace cb8002ee240bae76 ]---

It isn't clear exactly if there is really a use case for userspace
returning with a suspended transaction, however, doing so doesn't (on
its own) constitute a bad frame. As such, this patch simply discards
the transactional state of the context calling the sigreturn and
continues.

Reported-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Tested-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Reviewed-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Acked-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>