After moving the EQ ownership to software effectively destroying it, call
synchronize_irq() to ensure that any handler routines running on other CPU
cores finish execution. Only then free the EQ buffer.
The same thing is done when we destroy a CQ which is one of the sources
generating interrupts. In the case of CQ we want to avoid completion handlers
on a CQ that was destroyed. In the case we do the same to avoid receiving
asynchronous events after the EQ has been destroyed and its buffers freed.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After destroying the EQ, the object responsible for generating interrupts, call
synchronize_irq() to ensure that any handler routines running on other CPU
cores finish execution. Only then free the EQ buffer. This patch solves a very
rare case when we get panic on driver unload.
The same thing is done when we destroy a CQ which is one of the sources
generating interrupts. In the case of CQ we want to avoid completion handlers
on a CQ that was destroyed. In the case we do the same to avoid receiving
asynchronous events after the EQ has been destroyed and its buffers freed.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c: In function ‘xgene_enet_ecc_init’:
drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c:126: warning: ‘data’ may be used uninitialized in this function

Depending on the arbitrary value on the stack, the loop may terminate
too early, and cause a bogus -ENODEV failure.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

We accidentally mask by the _SHIFT variable.  It means that "event" is
always zero.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Tested-by: Jim Young <jamesx.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We need to cancel the work queue after rcu grace period,
otherwise it can be rescheduled by incoming packets.

We need to purge queue if some skbs are still in it.

We can use __skb_queue_head_init() variant in
macvlan_process_broadcast()
Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 412ca155 ("macvlan: Move broadcasts into a work queue")
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

percpu tcp_md5sig_pool contains memory blobs that ultimately
go through sg_set_buf().

-> sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));

This requires that whole area is in a physically contiguous portion
of memory. And that @buf is not backed by vmalloc().

Given that alloc_percpu() can use vmalloc() areas, this does not
fit the requirements.

Replace alloc_percpu() by a static DEFINE_PER_CPU() as tcp_md5sig_pool
is small anyway, there is no gain to dynamically allocate it.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 765cf997 ("tcp: md5: remove one indirection level in tcp_md5sig_pool")
Reported-by: Crestez Dan Leonard <cdleonard@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

David Vrabel says:

====================
xen-netback: guest Rx queue drain and stall fixes

This series fixes two critical xen-netback bugs.

1. Netback may consume all of host memory by queuing an unlimited
   number of skb on the internal guest Rx queue.  This behaviour is
   guest triggerable.

2. Carrier flapping under high traffic rates which reduces
   performance.

The first patch is a prerequite.  Removing support for frontends with
feature-rx-notify makes it easier to reason about the correctness of
netback since it no longer has to support this outdated and broken
mode.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

If a frontend not receiving packets it is useful to detect this and
turn off the carrier so packets are dropped early instead of being
queued and drained when they expire.

A to-guest queue is stalled if it doesn't have enough free slots for a
an extended period of time (default 60 s).

If at least one queue is stalled, the carrier is turned off (in the
expectation that the other queues will soon stall as well).  The
carrier is only turned on once all queues are ready.

When the frontend connects, all the queues start in the stalled state
and only become ready once the frontend queues enough Rx requests.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Netback needs to discard old to-guest skb's (guest Rx queue drain) and
it needs detect guest Rx stalls (to disable the carrier so packets are
discarded earlier), but the current implementation is very broken.

1. The check in hard_start_xmit of the slot availability did not
   consider the number of packets that were already in the guest Rx
   queue.  This could allow the queue to grow without bound.

   The guest stops consuming packets and the ring was allowed to fill
   leaving S slot free.  Netback queues a packet requiring more than S
   slots (ensuring that the ring stays with S slots free).  Netback
   queue indefinately packets provided that then require S or fewer
   slots.

2. The Rx stall detection is not triggered in this case since the
   (host) Tx queue is not stopped.

3. If the Tx queue is stopped and a guest Rx interrupt occurs, netback
   will consider this an Rx purge event which may result in it taking
   the carrier down unnecessarily.  It also considers a queue with
   only 1 slot free as unstalled (even though the next packet might
   not fit in this).

The internal guest Rx queue is limited by a byte length (to 512 Kib,
enough for half the ring).  The (host) Tx queue is stopped and started
based on this limit.  This sets an upper bound on the amount of memory
used by packets on the internal queue.

This allows the estimatation of the number of slots for an skb to be
removed (it wasn't a very good estimate anyway).  Instead, the guest
Rx thread just waits for enough free slots for a maximum sized packet.

skbs queued on the internal queue have an 'expires' time (set to the
current time plus the drain timeout).  The guest Rx thread will detect
when the skb at the head of the queue has expired and discard expired
skbs.  This sets a clear upper bound on the length of time an skb can
be queued for.  For a guest being destroyed the maximum time needed to
wait for all the packets it sent to be dropped is still the drain
timeout (10 s) since it will not be sending new packets.

Rx stall detection is reintroduced in a later commit.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Frontends that do not provide feature-rx-notify may stall because
netback depends on the notification from frontend to wake the guest Rx
thread (even if can_queue is false).

This could be fixed but feature-rx-notify was introduced in 2006 and I
am not aware of any frontends that do not implement this.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch brings back the makefile called testptp.mk which was removed
in commit adb19fb6 (Documentation: add makefiles for more targets).

While the idea of that commit was to improve build coverage of the
examples, the new Makefile is unable to cross compile the testptp program.
In contrast, the deleted makefile was able to do this just fine.

This patch fixes the regression by restoring the original makefile.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Peter Foley <pefoley2@pefoley.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

total_data_buflen is used by netvsc_send() to decide if a packet can be put
into send buffer. It should also include the size of RNDIS message before the
Ethernet frame. Otherwise, a messge with total size bigger than send_section_size
may be copied into the send buffer, and cause data corruption.

[Request to include this patch to the Stable branches]
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Tom Lendacky says:

====================
amd-xgbe: AMD XGBE driver fixes 2014-10-22

The following series of patches includes fixes to the driver.

- Properly handle feature changes via ethtool by using correctly sized
  variables
- Perform proper napi packet counting and budget checking

This patch series is based on net.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently the amd-xgbe driver increments the packets processed counter
each time a descriptor is processed.  Since a packet can be represented
by more than one descriptor incrementing the counter in this way is not
appropriate.  Also, since multiple descriptors cause the budget check
to be short circuited, sometimes the returned value from the poll
function would be larger than the budget value resulting in a WARN_ONCE
being triggered.

Update the polling logic to properly account for the number of packets
processed and exit when the budget value is reached.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The ndo_set_features callback function was improperly using an unsigned
int to save the current feature value for features such as NETIF_F_RXCSUM.
Since that feature is in the upper 32 bits of a 64 bit variable the
result was always 0 making it not possible to actually turn off the
hardware RX checksum support.  Change the unsigned int type to the
netdev_features_t type in order to properly capture the current value
and perform the proper operation.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Since commit 278d2404 (net: fec: ptp: Enable PPS output based on ptp clock)
fec_enet_interrupt calls fec_ptp_check_pps_event unconditionally, which calls
into ptp_clock_event. If fep->ptp_clock is NULL, ptp_clock_event tries to
dereference the NULL pointer.
Since on i.MX53 fep->bufdesc_ex is not set, fec_ptp_init is never called,
and fep->ptp_clock is NULL, which reliably causes a kernel panic.

This patch adds a check for fep->ptp_clock == NULL in fec_enet_interrupt.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

The commit "net: Save TX flow hash in sock and set in skbuf on xmit"
introduced the inet_set_txhash() and ip6_set_txhash() routines to calculate
and record flow hash(sk_txhash) in the socket structure. sk_txhash is used
to set skb->hash which is used to spread flows across multiple TXQs.

But, the above routines are invoked before the source port of the connection
is created. Because of this all outgoing connections that just differ in the
source port get hashed into the same TXQ.

This patch fixes this problem for IPv4/6 by invoking the the above routines
after the source port is available for the socket.

Fixes: b73c3d0e("net: Save TX flow hash in sock and set in skbuf on xmit")
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

pskb_may_pull() maybe change skb->data and make nh and exthdr pointer
oboslete, so recompute the nd and exthdr
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After interface restart (eg: after link disconnection/reconnection), the bridge
function doesn't work anymore. This is due to the promiscuous mode being cleared
by the restart.

The mac-fcc already includes code to set the promiscuous mode back during the restart.
This patch adds the same handling to mac-fec and mac-scc.

Tested with bridge function on MPC885 with FEC.
Reported-by: Germain Montoies <germain.montoies@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

The crafted header start address is from a driver supplied buffer, which
one can reasonably expect to be aligned on a 4-bytes boundary.
However ATM the TSO helper API is only used by ethernet drivers and
the tcp header will then be aligned to a 2-bytes only boundary from the
header start address.
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

write_count and insert_count can wrap around, making > check invalid.

Fixes: 70b33fb0 ("sfc: add support for
 skb->xmit_more").
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use netdev_alloc_pcpu_stats to allocate percpu stats and initialize syncp.

Fixes: 22e0f8b9 "net: sched: make bstats per cpu and estimator RCU safe"
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

while comparing for verifier state equivalency the comparison
was missing a check for uninitialized register.
Make sure it does so and add a testcase.

Fixes: f1bca824 ("bpf: add search pruning optimization to verifier")
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The synchronize_rcu() in netlink_release() introduces unacceptable
latency. Reintroduce minimal lookup so we can drop the
synchronize_rcu() until socket destruction has been RCUfied.

Cc: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Reported-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Reported-and-tested-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

When running tipcTC&tipcTS test suite, below lockdep unsafe locking
scenario is reported:

[ 1109.997854]
[ 1109.997988] =================================
[ 1109.998290] [ INFO: inconsistent lock state ]
[ 1109.998575] 3.17.0-rc1+ #113 Not tainted
[ 1109.998762] ---------------------------------
[ 1109.998762] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
[ 1109.998762] swapper/7/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[ 1109.998762]  (slock-AF_TIPC){+.?...}, at: [<ffffffffa0011969>] tipc_sk_rcv+0x49/0x2b0 [tipc]
[ 1109.998762] {SOFTIRQ-ON-W} state was registered at:
[ 1109.998762]   [<ffffffff810a4770>] __lock_acquire+0x6a0/0x1d80
[ 1109.998762]   [<ffffffff810a6555>] lock_acquire+0x95/0x1e0
[ 1109.998762]   [<ffffffff81a2d1ce>] _raw_spin_lock+0x3e/0x80
[ 1109.998762]   [<ffffffffa0011969>] tipc_sk_rcv+0x49/0x2b0 [tipc]
[ 1109.998762]   [<ffffffffa0004fe8>] tipc_link_xmit+0xa8/0xc0 [tipc]
[ 1109.998762]   [<ffffffffa000ec6f>] tipc_sendmsg+0x15f/0x550 [tipc]
[ 1109.998762]   [<ffffffffa000f165>] tipc_connect+0x105/0x140 [tipc]
[ 1109.998762]   [<ffffffff817676ee>] SYSC_connect+0xae/0xc0
[ 1109.998762]   [<ffffffff81767b7e>] SyS_connect+0xe/0x10
[ 1109.998762]   [<ffffffff817a9788>] compat_SyS_socketcall+0xb8/0x200
[ 1109.998762]   [<ffffffff81a306e5>] sysenter_dispatch+0x7/0x1f
[ 1109.998762] irq event stamp: 241060
[ 1109.998762] hardirqs last  enabled at (241060): [<ffffffff8105a4ad>] __local_bh_enable_ip+0x6d/0xd0
[ 1109.998762] hardirqs last disabled at (241059): [<ffffffff8105a46f>] __local_bh_enable_ip+0x2f/0xd0
[ 1109.998762] softirqs last  enabled at (241020): [<ffffffff81059a52>] _local_bh_enable+0x22/0x50
[ 1109.998762] softirqs last disabled at (241021): [<ffffffff8105a626>] irq_exit+0x96/0xc0
[ 1109.998762]
[ 1109.998762] other info that might help us debug this:
[ 1109.998762]  Possible unsafe locking scenario:
[ 1109.998762]
[ 1109.998762]        CPU0
[ 1109.998762]        ----
[ 1109.998762]   lock(slock-AF_TIPC);
[ 1109.998762]   <Interrupt>
[ 1109.998762]     lock(slock-AF_TIPC);
[ 1109.998762]
[ 1109.998762]  *** DEADLOCK ***
[ 1109.998762]
[ 1109.998762] 2 locks held by swapper/7/0:
[ 1109.998762]  #0:  (rcu_read_lock){......}, at: [<ffffffff81782dc9>] __netif_receive_skb_core+0x69/0xb70
[ 1109.998762]  #1:  (rcu_read_lock){......}, at: [<ffffffffa0001c90>] tipc_l2_rcv_msg+0x40/0x260 [tipc]
[ 1109.998762]
[ 1109.998762] stack backtrace:
[ 1109.998762] CPU: 7 PID: 0 Comm: swapper/7 Not tainted 3.17.0-rc1+ #113
[ 1109.998762] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
[ 1109.998762]  ffffffff82745830 ffff880016c03828 ffffffff81a209eb 0000000000000007
[ 1109.998762]  ffff880017b3cac0 ffff880016c03888 ffffffff81a1c5ef 0000000000000001
[ 1109.998762]  ffff880000000001 ffff880000000000 ffffffff81012d4f 0000000000000000
[ 1109.998762] Call Trace:
[ 1109.998762]  <IRQ>  [<ffffffff81a209eb>] dump_stack+0x4e/0x68
[ 1109.998762]  [<ffffffff81a1c5ef>] print_usage_bug+0x1f1/0x202
[ 1109.998762]  [<ffffffff81012d4f>] ? save_stack_trace+0x2f/0x50
[ 1109.998762]  [<ffffffff810a406c>] mark_lock+0x28c/0x2f0
[ 1109.998762]  [<ffffffff810a3440>] ? print_irq_inversion_bug.part.46+0x1f0/0x1f0
[ 1109.998762]  [<ffffffff810a467d>] __lock_acquire+0x5ad/0x1d80
[ 1109.998762]  [<ffffffff810a70dd>] ? trace_hardirqs_on+0xd/0x10
[ 1109.998762]  [<ffffffff8108ace8>] ? sched_clock_cpu+0x98/0xc0
[ 1109.998762]  [<ffffffff8108ad2b>] ? local_clock+0x1b/0x30
[ 1109.998762]  [<ffffffff810a10dc>] ? lock_release_holdtime.part.29+0x1c/0x1a0
[ 1109.998762]  [<ffffffff8108aa05>] ? sched_clock_local+0x25/0x90
[ 1109.998762]  [<ffffffffa000dec0>] ? tipc_sk_get+0x60/0x80 [tipc]
[ 1109.998762]  [<ffffffff810a6555>] lock_acquire+0x95/0x1e0
[ 1109.998762]  [<ffffffffa0011969>] ? tipc_sk_rcv+0x49/0x2b0 [tipc]
[ 1109.998762]  [<ffffffff810a6fb6>] ? trace_hardirqs_on_caller+0xa6/0x1c0
[ 1109.998762]  [<ffffffff81a2d1ce>] _raw_spin_lock+0x3e/0x80
[ 1109.998762]  [<ffffffffa0011969>] ? tipc_sk_rcv+0x49/0x2b0 [tipc]
[ 1109.998762]  [<ffffffffa000dec0>] ? tipc_sk_get+0x60/0x80 [tipc]
[ 1109.998762]  [<ffffffffa0011969>] tipc_sk_rcv+0x49/0x2b0 [tipc]
[ 1109.998762]  [<ffffffffa00076bd>] tipc_rcv+0x5ed/0x960 [tipc]
[ 1109.998762]  [<ffffffffa0001d1c>] tipc_l2_rcv_msg+0xcc/0x260 [tipc]
[ 1109.998762]  [<ffffffffa0001c90>] ? tipc_l2_rcv_msg+0x40/0x260 [tipc]
[ 1109.998762]  [<ffffffff81783345>] __netif_receive_skb_core+0x5e5/0xb70
[ 1109.998762]  [<ffffffff81782dc9>] ? __netif_receive_skb_core+0x69/0xb70
[ 1109.998762]  [<ffffffff81784eb9>] ? dev_gro_receive+0x259/0x4e0
[ 1109.998762]  [<ffffffff817838f6>] __netif_receive_skb+0x26/0x70
[ 1109.998762]  [<ffffffff81783acd>] netif_receive_skb_internal+0x2d/0x1f0
[ 1109.998762]  [<ffffffff81785518>] napi_gro_receive+0xd8/0x240
[ 1109.998762]  [<ffffffff815bf854>] e1000_clean_rx_irq+0x2c4/0x530
[ 1109.998762]  [<ffffffff815c1a46>] e1000_clean+0x266/0x9c0
[ 1109.998762]  [<ffffffff8108ad2b>] ? local_clock+0x1b/0x30
[ 1109.998762]  [<ffffffff8108aa05>] ? sched_clock_local+0x25/0x90
[ 1109.998762]  [<ffffffff817842b1>] net_rx_action+0x141/0x310
[ 1109.998762]  [<ffffffff810bd710>] ? handle_fasteoi_irq+0xe0/0x150
[ 1109.998762]  [<ffffffff81059fa6>] __do_softirq+0x116/0x4d0
[ 1109.998762]  [<ffffffff8105a626>] irq_exit+0x96/0xc0
[ 1109.998762]  [<ffffffff81a30d07>] do_IRQ+0x67/0x110
[ 1109.998762]  [<ffffffff81a2ee2f>] common_interrupt+0x6f/0x6f
[ 1109.998762]  <EOI>  [<ffffffff8100d2b7>] ? default_idle+0x37/0x250
[ 1109.998762]  [<ffffffff8100d2b5>] ? default_idle+0x35/0x250
[ 1109.998762]  [<ffffffff8100dd1f>] arch_cpu_idle+0xf/0x20
[ 1109.998762]  [<ffffffff810999fd>] cpu_startup_entry+0x27d/0x4d0
[ 1109.998762]  [<ffffffff81034c78>] start_secondary+0x188/0x1f0

When intra-node messages are delivered from one process to another
process, tipc_link_xmit() doesn't disable BH before it directly calls
tipc_sk_rcv() on process context to forward messages to destination
socket. Meanwhile, if messages delivered by remote node arrive at the
node and their destinations are also the same socket, tipc_sk_rcv()
running on process context might be preempted by tipc_sk_rcv() running
BH context. As a result, the latter cannot obtain the socket lock as
the lock was obtained by the former, however, the former has no chance
to be run as the latter is owning the CPU now, so headlock happens. To
avoid it, BH should be always disabled in tipc_sk_rcv().
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Locking dependency detected below possible unsafe locking scenario:

           CPU0                          CPU1
T0:  tipc_named_rcv()                tipc_rcv()
T1:  [grab nametble write lock]*     [grab node lock]*
T2:  tipc_update_nametbl()           tipc_node_link_up()
T3:  tipc_nodesub_subscribe()        tipc_nametbl_publish()
T4:  [grab node lock]*               [grab nametble write lock]*

The opposite order of holding nametbl write lock and node lock on
above two different paths may result in a deadlock. If we move the
the updating of the name table after link state named out of node
lock, the reverse order of holding locks will be eliminated, and
as a result, the deadlock risk.
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Govindarajulu Varadarajan says:

====================
enic: Bug fixes

This series fixes the following problem.

Please apply this to net.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

In enic_stop, we disable preemption using local_bh_disable(). We disable
preemption to wait for busy_poll to finish.

napi_disable should not be called here as it might sleep.

Moving napi_disable() call out side of local_bh_disable.

BUG: sleeping function called from invalid context at include/linux/netdevice.h:477
in_atomic(): 1, irqs_disabled(): 0, pid: 443, name: ifconfig
INFO: lockdep is turned off.
Preemption disabled at:[<ffffffffa029c5c4>] enic_rfs_flw_tbl_free+0x34/0xd0 [enic]

CPU: 31 PID: 443 Comm: ifconfig Not tainted 3.17.0-netnext-05504-g59f35b81 #268
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 ffff8800dac10000 ffff88020b8dfcb8 ffffffff8148a57c 0000000000000000
 ffff88020b8dfcd0 ffffffff8107e253 ffff8800dac12a40 ffff88020b8dfd10
 ffffffffa029305b ffff88020b8dfd48 ffff8800dac10000 ffff88020b8dfd48
Call Trace:
 [<ffffffff8148a57c>] dump_stack+0x4e/0x7a
 [<ffffffff8107e253>] __might_sleep+0x123/0x1a0
 [<ffffffffa029305b>] enic_stop+0xdb/0x4d0 [enic]
 [<ffffffff8138ed7d>] __dev_close_many+0x9d/0xf0
 [<ffffffff8138ef81>] __dev_close+0x31/0x50
 [<ffffffff813974a8>] __dev_change_flags+0x98/0x160
 [<ffffffff81397594>] dev_change_flags+0x24/0x60
 [<ffffffff814085fd>] devinet_ioctl+0x63d/0x710
 [<ffffffff81139c16>] ? might_fault+0x56/0xc0
 [<ffffffff81409ef5>] inet_ioctl+0x65/0x90
 [<ffffffff813768e0>] sock_do_ioctl+0x20/0x50
 [<ffffffff81376ebb>] sock_ioctl+0x20b/0x2e0
 [<ffffffff81197250>] do_vfs_ioctl+0x2e0/0x500
 [<ffffffff81492619>] ? sysret_check+0x22/0x5d
 [<ffffffff81285f23>] ? __this_cpu_preempt_check+0x13/0x20
 [<ffffffff8109fe19>] ? trace_hardirqs_on_caller+0x119/0x270
 [<ffffffff811974ac>] SyS_ioctl+0x3c/0x80
 [<ffffffff814925ed>] system_call_fastpath+0x1a/0x1f
Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The following warning is shown when spinlock debug is enabled.

This occurs when enic_flow_may_expire timer function is running and
enic_stop is called on same CPU.

Fix this by using spink_lock_bh().

=================================
[ INFO: inconsistent lock state ]
3.17.0-netnext-05504-g59f35b81 #268 Not tainted
---------------------------------
inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
ifconfig/443 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&(&enic->rfs_h.lock)->rlock){+.?...}, at:
enic_rfs_flw_tbl_free+0x34/0xd0 [enic]
{IN-SOFTIRQ-W} state was registered at:
  [<ffffffff810a25af>] __lock_acquire+0x83f/0x21c0
  [<ffffffff810a45f2>] lock_acquire+0xa2/0xd0
  [<ffffffff814913fc>] _raw_spin_lock+0x3c/0x80
  [<ffffffffa029c3d5>] enic_flow_may_expire+0x25/0x130[enic]
  [<ffffffff810bcd07>] call_timer_fn+0x77/0x100
  [<ffffffff810bd8e3>] run_timer_softirq+0x1e3/0x270
  [<ffffffff8105f9ae>] __do_softirq+0x14e/0x280
  [<ffffffff8105fdae>] irq_exit+0x8e/0xb0
  [<ffffffff8103da0f>] smp_apic_timer_interrupt+0x3f/0x50
  [<ffffffff81493742>] apic_timer_interrupt+0x72/0x80
  [<ffffffff81018143>] default_idle+0x13/0x20
  [<ffffffff81018a6a>] arch_cpu_idle+0xa/0x10
  [<ffffffff81097676>] cpu_startup_entry+0x2c6/0x330
  [<ffffffff8103b7ad>] start_secondary+0x21d/0x290
irq event stamp: 2997
hardirqs last  enabled at (2997): [<ffffffff81491865>] _raw_spin_unlock_irqrestore+0x65/0x90
hardirqs last disabled at (2996): [<ffffffff814915e6>] _raw_spin_lock_irqsave+0x26/0x90
softirqs last  enabled at (2968): [<ffffffff813b57a3>] dev_deactivate_many+0x213/0x260
softirqs last disabled at (2966): [<ffffffff813b5783>] dev_deactivate_many+0x1f3/0x260

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&(&enic->rfs_h.lock)->rlock);
  <Interrupt>
    lock(&(&enic->rfs_h.lock)->rlock);

 *** DEADLOCK ***
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Florian Westphal says:

====================
net: minor gso encapsulation fixes

The following series fixes a minor bug in the gso segmentation handlers
when encapsulation offload is used.

Theoretically this could cause kernel panic when the stack tries
to software-segment such a GRE offload packet, but it looks like there
is only one affected call site (tbf scheduler) and it handles NULL
return value.

I've included a followup patch to add IS_ERR_OR_NULL checks where needed.

While looking into this, I also found that size computation of the individual
segments is incorrect if skb->encapsulation is set.

Please see individual patches for delta vs. v1.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

if ->encapsulation is set we have to use inner_tcp_hdrlen and add the
size of the inner network headers too.

This is 'mostly harmless'; tbf might send skb that is slightly over
quota or drop skb even if it would have fit.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

skb_gso_segment has three possible return values:
1. a pointer to the first segmented skb
2. an errno value (IS_ERR())
3. NULL.  This can happen when GSO is used for header verification.

However, several callers currently test IS_ERR instead of IS_ERR_OR_NULL
and would oops when NULL is returned.

Note that these call sites should never actually see such a NULL return
value; all callers mask out the GSO bits in the feature argument.

However, there have been issues with some protocol handlers erronously not
respecting the specified feature mask in some cases.

It is preferable to get 'have to turn off hw offloading, else slow' reports
rather than 'kernel crashes'.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

skb_gso_segment() has a 'features' argument representing offload features
available to the output path.

A few handlers, e.g. GRE, instead re-fetch the features of skb->dev and use
those instead of the provided ones when handing encapsulation/tunnels.

Depending on dev->hw_enc_features of the output device skb_gso_segment() can
then return NULL even when the caller has disabled all GSO feature bits,
as segmentation of inner header thinks device will take care of segmentation.

This e.g. affects the tbf scheduler, which will silently drop GRE-encap GSO skbs
that did not fit the remaining token quota as the segmentation does not work
when device supports corresponding hw offload capabilities.

Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pablo Neira Ayuso says:

====================
netfilter fixes for net

The following patchset contains netfilter fixes for your net tree,
they are:

1) Fix missing MODULE_LICENSE() in the new nf_reject_ipv{4,6} modules.

2) Restrict nat and masq expressions to the nat chain type. Otherwise,
   users may crash their kernel if they attach a nat/masq rule to a non
   nat chain.

3) Fix hook validation in nft_compat when non-base chains are used.
   Basically, initialize hook_mask to zero.

4) Make sure you use match/targets in nft_compat from the right chain
   type. The existing validation relies on the table name which can be
   avoided by

5) Better netlink attribute validation in nft_nat. This expression has
   to reject the configuration when no address and proto configurations
   are specified.

6) Interpret NFTA_NAT_REG_*_MAX if only if NFTA_NAT_REG_*_MIN is set.
   Yet another sanity check to reject incorrect configurations from
   userspace.

7) Conditional NAT attribute dumping depending on the existing
   configuration.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The following patch fixes a bug which causes the ax88179_178a driver to be
incapable of being added to a bond.

When I brought up the issue with the bonding maintainers, they indicated
that the real problem was with the NIC driver which must return zero for
success (of setting the MAC address). I see that several other NIC drivers
follow that pattern by either simply always returing zero, or by passing
through a negative (error) result while rewriting any positive return code
to zero. With that same philisophy applied to the ax88179_178a driver, it
allows it to work correctly with the bonding driver.

I believe this is suitable for queuing in -stable, as it's a small, simple,
and obvious fix that corrects a defect with no other known workaround.

This patch is against vanilla 3.17(.0).
Signed-off-by: Ian Morgan <imorgan@primordial.ca>

 drivers/net/usb/ax88179_178a.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull ntb (non-transparent bridge) updates from Jon Mason:
 "Add support for Haswell NTB split BARs, a debugfs entry for basic
  debugging info, and some code clean-ups"

* tag 'ntb-3.18' of git://github.com/jonmason/ntb:
  ntb: Adding split BAR support for Haswell platforms
  ntb: use errata flag set via DID to implement workaround
  ntb: conslidate reading of PPD to move platform detection earlier
  ntb: move platform detection to separate function
  NTB: debugfs device entry

Pull i2c updates from Wolfram Sang:
 "Highlights from the I2C subsystem for 3.18:

   - new drivers for Axxia AM55xx, and Hisilicon hix5hd2 SoC.

   - designware driver gained AMD support, exynos gained exynos7 support

  The rest is usual driver stuff.  Hopefully no lowlights this time"

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: i801: Add Device IDs for Intel Sunrise Point PCH
  i2c: hix5hd2: add i2c controller driver
  i2c-imx: Disable the clock on probe failure
  i2c: designware: Add support for AMD I2C controller
  i2c: designware: Rework probe() to get clock a bit later
  i2c: designware: Default to fast mode in case of ACPI
  i2c: axxia: Add I2C driver for AXM55xx
  i2c: exynos: add support for HSI2C module on Exynos7
  i2c: mxs: detect No Slave Ack on SELECT in PIO mode
  i2c: cros_ec: Remove EC_I2C_FLAG_10BIT
  i2c: cros-ec-tunnel: Add of match table
  i2c: rcar: remove sign-compare flaw
  i2c: ismt: Use minimum descriptor size
  i2c: imx: Add arbitration lost check
  i2c: rk3x: Remove unlikely() annotations
  i2c: rcar: check for no IRQ in rcar_i2c_irq()
  i2c: rcar: make rcar_i2c_prepare_msg() *void*
  i2c: rcar: simplify check for last message
  i2c: designware: add support of platform data to set I2C mode
  i2c: designware: add support of I2C standard mode

Pull sound fixes from Takashi Iwai:
 "Here are a collection of small fixes after 3.18 merge.

  The urgent one is the fix for kernel panics with linked PCM substream
  triggered by the recent nonatomic PCM ops support.  Other two fixes
  (emu10k1 and bebob) are stable fixes, and one easy PCI ID addition for
  a new Intel HD-audio controller"

* tag 'sound-fix-3.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda_intel: Add Device IDs for Intel Sunrise Point PCH
  ALSA: emu10k1: Fix deadlock in synth voice lookup
  ALSA: pcm: Fix referred substream in snd_pcm_action_group() unlock loop
  ALSA: bebob: Fix failure to detect source of clock for Terratec Phase 88

Pull second round of input updates from Dmitry Torokhov:
 "Mostly simple bug fixes, although we do have one brand new driver for
  Microchip AR1021 i2c touchscreen.

  Also there is the change to stop trying to use i8042 active
  multiplexing by default (it is still possible to activate it via
  i8042.nomux=0 on boxes that implement it)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: xpad - add Thrustmaster as Xbox 360 controller vendor
  Input: xpad - add USB ID for Thrustmaster Ferrari 458 Racing Wheel
  Input: max77693-haptic - fix state check in imax77693_haptic_disable()
  Input: xen-kbdfront - free grant table entry in xenkbd_disconnect_backend
  Input: alps - fix v4 button press recognition
  Input: i8042 - disable active multiplexing by default
  Input: i8042 - add noloop quirk for Asus X750LN
  Input: synaptics - gate forcepad support by DMI check
  Input: Add Microchip AR1021 i2c touchscreen
  Input: cros_ec_keyb - add of match table
  Input: serio - avoid negative serio device numbers
  Input: avoid negative input device numbers
  Input: automatically set EV_ABS bit in input_set_abs_params
  Input: adp5588-keys - cancel workqueue in failure path
  Input: opencores-kbd - switch to using managed resources
  Input: evdev - fix EVIOCG{type} ioctl

Pull infiniband/RDMA updates from Roland Dreier:
 - large set of iSER initiator improvements
 - hardware driver fixes for cxgb4, mlx5 and ocrdma
 - small fixes to core midlayer

* tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband: (47 commits)
  RDMA/cxgb4: Fix ntuple calculation for ipv6 and remove duplicate line
  RDMA/cxgb4: Add missing neigh_release in find_route
  RDMA/cxgb4: Take IPv6 into account for best_mtu and set_emss
  RDMA/cxgb4: Make c4iw_wr_log_size_order static
  IB/core: Fix XRC race condition in ib_uverbs_open_qp
  IB/core: Clear AH attr variable to prevent garbage data
  RDMA/ocrdma: Save the bit environment, spare unncessary parenthesis
  RDMA/ocrdma: The kernel has a perfectly good BIT() macro - use it
  RDMA/ocrdma: Don't memset() buffers we just allocated with kzalloc()
  RDMA/ocrdma: Remove a unused-label warning
  RDMA/ocrdma: Convert kernel VA to PA for mmap in user
  RDMA/ocrdma: Get vlan tag from ib_qp_attrs
  RDMA/ocrdma: Add default GID at index 0
  IB/mlx5, iser, isert: Add Signature API additions
  Target/iser: Centralize ib_sig_domain setting
  IB/iser: Centralize ib_sig_domain settings
  IB/mlx5: Use extended internal signature layout
  IB/iser: Set IP_CSUM as default guard type
  IB/iser: Remove redundant assignment
  IB/mlx5: Use enumerations for PI copy mask
  ...