Rahul Lakkireddy [Fri, 8 Dec 2017 04:18:38 +0000 (09:48 +0530)]
cxgb4: collect HMA memory dump
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rahul Lakkireddy [Fri, 8 Dec 2017 04:18:37 +0000 (09:48 +0530)]
cxgb4: collect MC memory dump
Use meminfo to get base address and size of MC memory. Also use same
meminfo for EDC memory dumps.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Rahul Lakkireddy [Fri, 8 Dec 2017 04:18:36 +0000 (09:48 +0530)]
cxgb4: collect on-chip memory information
Collect memory layout of various on-chip memory regions. Move code
for collecting on-chip memory information to cudbg_lib.c and update
cxgb4_debugfs.c to use the common function. Also include
cudbg_entity.h before cudbg_lib.h to avoid adding cudbg entity
structure forward declarations in cudbg_lib.h.
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Fri, 8 Dec 2017 19:23:00 +0000 (14:23 -0500)]
Merge branch 'veth-and-GSO-maximums'
Stephen Hemminger says:
====================
veth and GSO maximums
This is the more general way to solving the issue of GSO limits
not being set correctly for containers on Azure. If a GSO packet
is sent to host that exceeds the limit (reported by NDIS), then
the host is forced to do segmentation in software which has noticeable
performance impact.
The core rtnetlink infrastructure already has the messages and
infrastructure to allow changing gso limits. With an updated iproute2
the following already works:
# ip li set dev dummy0 gso_max_size 30000
These patches are about making it easier with veth.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Stephen Hemminger [Thu, 7 Dec 2017 23:40:20 +0000 (15:40 -0800)]
veth: set peer GSO values
When new veth is created, and GSO values have been configured
on one device, clone those values to the peer.
For example:
# ip link add dev vm1 gso_max_size 65530 type veth peer name vm2
This should create vm1 <--> vm2 with both having GSO maximum
size set to 65530.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stephen Hemminger [Thu, 7 Dec 2017 23:40:19 +0000 (15:40 -0800)]
rtnetlink: allow GSO maximums to be set on device creation
Netlink device already allows changing GSO sizes with
ip set command. The part that is missing is allowing overriding
GSO settings on device creation.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Niklas Cassel [Thu, 7 Dec 2017 22:56:10 +0000 (23:56 +0100)]
net: stmmac: fix broken dma_interrupt handling for multi-queues
There is nothing that says that number of TX queues == number of RX
queues. E.g. the ARTPEC-6 SoC has 2 TX queues and 1 RX queue.
This code is obviously wrong:
for (chan = 0; chan < tx_channel_count; chan++) {
struct stmmac_rx_queue *rx_q = &priv->rx_queue[chan];
priv->rx_queue has size MTL_MAX_RX_QUEUES, so this will send an
uninitialized napi_struct to __napi_schedule(), causing us to
crash in net_rx_action(), because napi_struct->poll is zero.
[12846.759880] Unable to handle kernel NULL pointer dereference at virtual address
00000000
[12846.768014] pgd = (ptrval)
[12846.770742] [
00000000] *pgd=
39ec7831, *pte=
00000000, *ppte=
00000000
[12846.777023] Internal error: Oops:
80000007 [#1] PREEMPT SMP ARM
[12846.782942] Modules linked in:
[12846.785998] CPU: 0 PID: 161 Comm: dropbear Not tainted
4.15.0-rc2-00285-gf5fb5f2f39a7 #36
[12846.794177] Hardware name: Axis ARTPEC-6 Platform
[12846.798879] task: (ptrval) task.stack: (ptrval)
[12846.803407] PC is at 0x0
[12846.805942] LR is at net_rx_action+0x274/0x43c
[12846.810383] pc : [<
00000000>] lr : [<
80bff064>] psr:
200e0113
[12846.816648] sp :
b90d9ae8 ip :
b90d9ae8 fp :
b90d9b44
[12846.821871] r10:
00000008 r9 :
0013250e r8 :
00000100
[12846.827094] r7 :
0000012c r6 :
00000000 r5 :
00000001 r4 :
bac84900
[12846.833619] r3 :
00000000 r2 :
b90d9b08 r1 :
00000000 r0 :
bac84900
Since each DMA channel can be used for rx and tx simultaneously,
the current code should probably be rewritten so that napi_struct is
embedded in a new struct stmmac_channel.
That way, stmmac_poll() can call stmmac_tx_clean() on just the tx queue
where we got the IRQ, instead of looping through all tx queues.
This is also how the xgbe driver does it (another driver for this IP).
Fixes: c22a3f48ef99 ("net: stmmac: adding multiple napi mechanism")
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Egil Hjelmeland [Thu, 7 Dec 2017 18:56:04 +0000 (19:56 +0100)]
net: dsa: lan9303: Protect ALR operations with mutex
ALR table operations are a sequence of related register operations which
should be protected from concurrent access. The alr_cache should also be
protected. Add alr_mutex doing that.
Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jiri Pirko [Fri, 8 Dec 2017 18:27:27 +0000 (19:27 +0100)]
net: sched: fix use-after-free in tcf_block_put_ext
Since the block is freed with last chain being put, once we reach the
end of iteration of list_for_each_entry_safe, the block may be
already freed. I'm hitting this only by creating and deleting clsact:
[ 202.171952] ==================================================================
[ 202.180182] BUG: KASAN: use-after-free in tcf_block_put_ext+0x240/0x390
[ 202.187590] Read of size 8 at addr
ffff880225539a80 by task tc/796
[ 202.194508]
[ 202.196185] CPU: 0 PID: 796 Comm: tc Not tainted 4.15.0-rc2jiri+ #5
[ 202.203200] Hardware name: Mellanox Technologies Ltd. "MSN2100-CB2F"/"SA001017", BIOS 5.6.5 06/07/2016
[ 202.213613] Call Trace:
[ 202.216369] dump_stack+0xda/0x169
[ 202.220192] ? dma_virt_map_sg+0x147/0x147
[ 202.224790] ? show_regs_print_info+0x54/0x54
[ 202.229691] ? tcf_chain_destroy+0x1dc/0x250
[ 202.234494] print_address_description+0x83/0x3d0
[ 202.239781] ? tcf_block_put_ext+0x240/0x390
[ 202.244575] kasan_report+0x1ba/0x460
[ 202.248707] ? tcf_block_put_ext+0x240/0x390
[ 202.253518] tcf_block_put_ext+0x240/0x390
[ 202.258117] ? tcf_chain_flush+0x290/0x290
[ 202.262708] ? qdisc_hash_del+0x82/0x1a0
[ 202.267111] ? qdisc_hash_add+0x50/0x50
[ 202.271411] ? __lock_is_held+0x5f/0x1a0
[ 202.275843] clsact_destroy+0x3d/0x80 [sch_ingress]
[ 202.281323] qdisc_destroy+0xcb/0x240
[ 202.285445] qdisc_graft+0x216/0x7b0
[ 202.289497] tc_get_qdisc+0x260/0x560
Fix this by holding the block also by chain 0 and put chain 0
explicitly, out of the list_for_each_entry_safe loop at the very
end of tcf_block_put_ext.
Fixes: efbf78973978 ("net_sched: get rid of rcu_barrier() in tcf_block_put_ext()")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Fri, 8 Dec 2017 18:32:27 +0000 (13:32 -0500)]
Merge branch 'lockless-qdisc-series'
John Fastabend says:
====================
lockless qdisc series
This series adds support for building lockless qdiscs. This is
the result of noticing the qdisc lock is a common hot-spot in
perf analysis of the Linux network stack, especially when testing
with high packet per second rates. However, nothing is free and
most qdiscs rely on the qdisc lock for their data structures so
each qdisc must be converted on a case by case basis. In this
series, to kick things off, we make pfifo_fast, mq, and mqprio
lockless. Follow up series can address additional qdiscs as needed.
For example sch_tbf might be useful. To allow this the lockless
design is an opt-in flag. In some future utopia we convert all
qdiscs and we get to drop this case analysis, but in order to
make progress we live in the real-world.
There are also a handful of optimizations I have behind this
series and a few code cleanups that I couldn't figure out how
to fit neatly into this series with out increasing the patch
count. Once this is in additional patches can address this. The
most notable is in skb_dequeue we can push the consumer lock
out a bit and consume multiple skbs off the skb_array in pfifo
fast per iteration. Ideally we could push arrays of packets at
drivers as well but we would need the infrastructure for this.
The other notable improvement is to do less locking in the
overrun cases where bad tx queue list and gso_skb are being
hit. Although, nice in theory in practice this is the error
case and I haven't found a benchmark where this matters yet.
For testing...
My first test case uses multiple containers (via cilium) where
multiple client containers use 'wrk' to benchmark connections with
a server container running lighttpd. Where lighttpd is configured
to use multiple threads, one per core. Additionally this test has
a proxy agent running so all traffic takes an extra hop through a
proxy container. In these cases each TCP packet traverses the egress
qdisc layer at least four times and the ingress qdisc layer an
additional four times. This makes for a good stress test IMO, perf
details below.
The other micro-benchmark I run is injecting packets directly into
qdisc layer using pktgen. This uses the benchmark script,
./pktgen_bench_xmit_mode_queue_xmit.sh
Benchmarks taken in two cases, "base" running latest net-next no
changes to qdisc layer and "qdisc" tests run with qdisc lockless
updates. Numbers reported in req/sec. All virtual 'veth' devices
run with pfifo_fast in the qdisc test case.
`wrk -t16 -c $conns -d30 "http://[$SERVER_IP4]:80"`
conns 16 32 64 1024
-----------------------------------------------
base: 18831 20201 21393 29151
qdisc: 19309 21063 23899 29265
notice in all cases we see performance improvement when running
with qdisc case.
Microbenchmarks using pktgen are as follows,
`pktgen_bench_xmit_mode_queue_xmit.sh -t 1 -i eth2 -c
20000000
base(mq): 2.1Mpps
base(pfifo_fast): 2.1Mpps
qdisc(mq): 2.6Mpps
qdisc(pfifo_fast): 2.6Mpps
notice numbers are the same for mq and pfifo_fast because only
testing a single thread here. In both tests we see a nice bump
in performance gain. The key with 'mq' is it is already per
txq ring so contention is minimal in the above cases. Qdiscs
such as tbf or htb which have more contention will likely show
larger gains when/if lockless versions are implemented.
Thanks to everyone who helped with this work especially Daniel
Borkmann, Eric Dumazet and Willem de Bruijn for discussing the
design and reviewing versions of the code.
Changes from the RFC: dropped a couple patches off the end,
fixed a bug with skb_queue_walk_safe not unlinking skb in all
cases, fixed a lockdep splat with pfifo_fast_destroy not calling
*_bh lock variant, addressed _most_ of Willem's comments, there
was a bug in the bulk locking (final patch) of the RFC series.
@Willem, I left out lockdep annotation for a follow on series
to add lockdep more completely, rather than just in code I
touched.
Comments and feedback welcome.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:58:19 +0000 (09:58 -0800)]
net: sched: pfifo_fast use skb_array
This converts the pfifo_fast qdisc to use the skb_array data structure
and set the lockless qdisc bit. pfifo_fast is the first qdisc to support
the lockless bit that can be a child of a qdisc requiring locking. So
we add logic to clear the lock bit on initialization in these cases when
the qdisc graft operation occurs.
This also removes the logic used to pick the next band to dequeue from
and instead just checks a per priority array for packets from top priority
to lowest. This might need to be a bit more clever but seems to work
for now.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:57:59 +0000 (09:57 -0800)]
net: skb_array: expose peek API
This adds a peek routine to skb_array.h for use with qdisc.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:57:39 +0000 (09:57 -0800)]
net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mqprio
The sch_mqprio qdisc creates a sub-qdisc per tx queue which are then
called independently for enqueue and dequeue operations. However
statistics are aggregated and pushed up to the "master" qdisc.
This patch adds support for any of the sub-qdiscs to be per cpu
statistic qdiscs. To handle this case add a check when calculating
stats and aggregate the per cpu stats if needed.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:57:20 +0000 (09:57 -0800)]
net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mq
The sch_mq qdisc creates a sub-qdisc per tx queue which are then
called independently for enqueue and dequeue operations. However
statistics are aggregated and pushed up to the "master" qdisc.
This patch adds support for any of the sub-qdiscs to be per cpu
statistic qdiscs. To handle this case add a check when calculating
stats and aggregate the per cpu stats if needed.
Also exports __gnet_stats_copy_queue() to use as a helper function.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:57:00 +0000 (09:57 -0800)]
net: sched: helpers to sum qlen and qlen for per cpu logic
Add qdisc qlen helper routines for lockless qdiscs to use.
The qdisc qlen is no longer used in the hotpath but it is reported
via stats query on the qdisc so it still needs to be tracked. This
adds the per cpu operations needed along with a helper to return
the summation of per cpu stats.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:56:42 +0000 (09:56 -0800)]
net: sched: check for frozen queue before skb_bad_txq check
I can not think of any reason to pull the bad txq skb off the qdisc if
the txq we plan to send this on is still frozen. So check for frozen
queue first and abort before dequeuing either skb_bad_txq skb or
normal qdisc dequeue() skb.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:56:23 +0000 (09:56 -0800)]
net: sched: use skb list for skb_bad_tx
Similar to how gso is handled use skb list for skb_bad_tx this is
required with lockless qdiscs because we may have multiple cores
attempting to push skbs into skb_bad_tx concurrently
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:56:04 +0000 (09:56 -0800)]
net: sched: drop qdisc_reset from dev_graft_qdisc
In qdisc_graft_qdisc a "new" qdisc is attached and the 'qdisc_destroy'
operation is called on the old qdisc. The destroy operation will wait
a rcu grace period and call qdisc_rcu_free(). At which point
gso_cpu_skb is free'd along with all stats so no need to zero stats
and gso_cpu_skb from the graft operation itself.
Further after dropping the qdisc locks we can not continue to call
qdisc_reset before waiting an rcu grace period so that the qdisc is
detached from all cpus. By removing the qdisc_reset() here we get
the correct property of waiting an rcu grace period and letting the
qdisc_destroy operation clean up the qdisc correctly.
Note, a refcnt greater than 1 would cause the destroy operation to
be aborted however if this ever happened the reference to the qdisc
would be lost and we would have a memory leak.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:55:45 +0000 (09:55 -0800)]
net: sched: explicit locking in gso_cpu fallback
This work is preparing the qdisc layer to support egress lockless
qdiscs. If we are running the egress qdisc lockless in the case we
overrun the netdev, for whatever reason, the netdev returns a busy
error code and the skb is parked on the gso_skb pointer. With many
cores all hitting this case at once its possible to have multiple
sk_buffs here so we turn gso_skb into a queue.
This should be the edge case and if we see this frequently then
the netdev/qdisc layer needs to back off.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:55:26 +0000 (09:55 -0800)]
net: sched: a dflt qdisc may be used with per cpu stats
Enable dflt qdisc support for per cpu stats before this patch a dflt
qdisc was required to use the global statistics qstats and bstats.
This adds a static flags field to qdisc_ops that is propagated
into qdisc->flags in qdisc allocate call. This allows the allocation
block to completely allocate the qdisc object so we don't have
dangling allocations after qdisc init.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:55:07 +0000 (09:55 -0800)]
net: sched: provide per cpu qstat helpers
The per cpu qstats support was added with per cpu bstat support which
is currently used by the ingress qdisc. This patch adds a set of
helpers needed to make other qdiscs that use qstats per cpu as well.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:54:47 +0000 (09:54 -0800)]
net: sched: remove remaining uses for qdisc_qlen in xmit path
sch_direct_xmit() uses qdisc_qlen as a return value but all call sites
of the routine only check if it is zero or not. Simplify the logic so
that we don't need to return an actual queue length value.
This introduces a case now where sch_direct_xmit would have returned
a qlen of zero but now it returns true. However in this case all
call sites of sch_direct_xmit will implement a dequeue() and get
a null skb and abort. This trades tracking qlen in the hotpath for
an extra dequeue operation. Overall this seems to be good for
performance.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:54:25 +0000 (09:54 -0800)]
net: sched: allow qdiscs to handle locking
This patch adds a flag for queueing disciplines to indicate the stack
does not need to use the qdisc lock to protect operations. This can
be used to build lockless scheduling algorithms and improving
performance.
The flag is checked in the tx path and the qdisc lock is only taken
if it is not set. For now use a conditional if statement. Later we
could be more aggressive if it proves worthwhile and use a static key
or wrap this in a likely().
Also the lockless case drops the TCQ_F_CAN_BYPASS logic. The reason
for this is synchronizing a qlen counter across threads proves to
cost more than doing the enqueue/dequeue operations when tested with
pktgen.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
John Fastabend [Thu, 7 Dec 2017 17:54:06 +0000 (09:54 -0800)]
net: sched: cleanup qdisc_run and __qdisc_run semantics
Currently __qdisc_run calls qdisc_run_end() but does not call
qdisc_run_begin(). This makes it hard to track pairs of
qdisc_run_{begin,end} across function calls.
To simplify reading these code paths this patch moves begin/end calls
into qdisc_run().
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Toshiaki Makita [Thu, 7 Dec 2017 04:15:15 +0000 (13:15 +0900)]
virtio_net: Disable interrupts if napi_complete_done rescheduled napi
Since commit
39e6c8208d7b ("net: solve a NAPI race") napi has been able
to be rescheduled within napi_complete_done() even in non-busypoll case,
but virtnet_poll() always enabled interrupts before complete, and when
napi was rescheduled within napi_complete_done() it did not disable
interrupts.
This caused more interrupts when event idx is disabled.
According to commit
cbdadbbf0c79 ("virtio_net: fix race in RX VQ
processing") we cannot place virtqueue_enable_cb_prepare() after
NAPI_STATE_SCHED is cleared, so disable interrupts again if
napi_complete_done() returned false.
Tested with vhost-user of OVS 2.7 on host, which does not have the event
idx feature.
* Before patch:
$ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 1472 60.00
32763206 0 6430.32
212992 60.00
23384299 4589.56
Interrupts on guest:
9872369
Packets/interrupt: 2.37
* After patch
$ netperf -t UDP_STREAM -H 192.168.150.253 -l 60 -- -m 1472
MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.150.253 () port 0 AF_INET
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
212992 1472 60.00
32794646 0 6436.49
212992 60.00
32793501 6436.27
Interrupts on guest:
4941299
Packets/interrupt: 6.64
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Fri, 8 Dec 2017 15:48:25 +0000 (10:48 -0500)]
Merge git://git./linux/kernel/git/bpf/bpf-next
Alexei Starovoitov says:
====================
pull-request: bpf-next 2017-12-07
The following pull-request contains BPF updates for your net-next tree.
The main changes are:
1) Detailed documentation of BPF development process from Daniel.
2) Addition of is_fullsock, snd_cwnd and srtt_us fields to bpf_sock_ops
from Lawrence.
3) Minor follow up for bpf_skb_set_tunnel_key() from William.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Jason Wang [Fri, 8 Dec 2017 04:02:30 +0000 (12:02 +0800)]
tuntap: fix possible deadlock when fail to register netdev
Private destructor could be called when register_netdev() fail with
rtnl lock held. This will lead deadlock in tun_free_netdev() who tries
to hold rtnl_lock. Fixing this by switching to use spinlock to
synchronize.
Fixes: 96f84061620c ("tun: add eBPF based queue selection method")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Thu, 7 Dec 2017 20:03:13 +0000 (15:03 -0500)]
Merge branch 'smc-fixes-next'
Ursula Braun says:
====================
smc: fixes 2017-12-07
here are some smc-patches. The initial 4 patches are cleanups.
Patch 5 gets rid of ib_post_sends in tasklet context to avoid peer drops due
to out-of-order receivals.
Patch 6 makes sure, the Linux SMC code understands variable sized CLC proposal
messages built according to RFC7609.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:49 +0000 (13:38 +0100)]
smc: support variable CLC proposal messages
According to RFC7609 [1] the CLC proposal message contains an area of
unknown length for future growth. Additionally it may contain up to
8 IPv6 prefixes. The current version of the SMC-code does not
understand CLC proposal messages using these variable length fields and,
thus, is incompatible with SMC implementations in other operating
systems.
This patch makes sure, SMC understands incoming CLC proposals
* with arbitrary length values for future growth
* with up to 8 IPv6 prefixes
[1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:48 +0000 (13:38 +0100)]
smc: no consumer update in tasklet context
The SMC protocol requires to send a separate consumer cursor update,
if it cannot be piggybacked to updates of the producer cursor.
When receiving a blocked signal from the sender, this update is sent
already in tasklet context. In addition consumer cursor updates are
sent after data receival.
Sending of cursor updates is controlled by sequence numbers.
Assuming receiving stray messages the receiver drops updates with older
sequence numbers than an already received cursor update with a higher
sequence number.
Sending consumer cursor updates in tasklet context may result in
wrong order sends and its corresponding drops at the receiver. Since
it is sufficient to send consumer cursor updates once the data is
received, this patch gets rid of the consumer cursor update in tasklet
context to guarantee in-sequence arrival of cursor updates.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:47 +0000 (13:38 +0100)]
smc: cleanup close checking during data receival
When waiting for data to be received it must be checked if the
peer signals shutdown. The SMC code uses two different checks
for this purpose, even though just one check is sufficient.
This patch removes the superfluous test for SOCK_DONE.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:46 +0000 (13:38 +0100)]
smc: no update for unused sk_write_pending
The smc code never checks the sk_write_pending sock field.
Thus there is no need to update it.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:45 +0000 (13:38 +0100)]
smc: improve smc_clc_send_decline() error handling
Let smc_clc_send_decline() return with an error, if the amount
sent is smaller than the length of an smc decline message.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Ursula Braun [Thu, 7 Dec 2017 12:38:44 +0000 (13:38 +0100)]
smc: make smc_close_active_abort() static
smc_close_active_abort() is used in smc_close.c only.
Make it static.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Florian Fainelli [Wed, 6 Dec 2017 23:03:33 +0000 (15:03 -0800)]
net: dsa: Allow compiling out legacy support
Introduce a configuration option: CONFIG_NET_DSA_LEGACY allowing to compile out
support for the old platform device and Device Tree binding registration.
Support for these configurations is scheduled to be removed in 4.17.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Michael Chan [Wed, 6 Dec 2017 22:31:22 +0000 (17:31 -0500)]
bnxt_en: Don't print "Link speed -1 no longer supported" messages.
On some dual port NICs, the 2 ports have to be configured with compatible
link speeds. Under some conditions, a port's configured speed may no
longer be supported. The firmware will send a message to the driver
when this happens.
Improve this logic that prints out the warning by only printing it if
we can determine the link speed that is no longer supported. If the
speed is unknown or it is in autoneg mode, skip the warning message.
Reported-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Tested-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Alexei Starovoitov [Wed, 6 Dec 2017 22:33:56 +0000 (14:33 -0800)]
Merge branch 'bpf-devel-doc'
Daniel Borkmann says:
====================
Few BPF doc updates
Two changes, i) add BPF trees into maintainers file, and ii) add
a BPF doc around the development process, similarly as we have
with netdev FAQ, but just describing BPF specifics. Thanks!
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Daniel Borkmann [Wed, 6 Dec 2017 00:12:41 +0000 (01:12 +0100)]
bpf, doc: add faq about bpf development process
In the same spirit of netdev FAQ, start a BPF FAQ as a collection
of expectations and/or workflow details in the context of BPF patch
processing.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Daniel Borkmann [Wed, 6 Dec 2017 00:12:40 +0000 (01:12 +0100)]
bpf, doc: add bpf trees and tps to maintainers entry
i) Add the bpf and bpf-next trees to the maintainers entry
so they can be found easily and picked up by test bots
etc that would integrate all trees from maintainers file.
Suggested by Stephen while integrating the trees into
linux-next.
ii) Add the two headers defining BPF/XDP tracepoints to the
list of files as well.
Suggested-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Gao Feng [Wed, 6 Dec 2017 11:04:26 +0000 (19:04 +0800)]
ipvlan: Eliminate duplicated codes with existing function
The recv flow of ipvlan l2 mode performs as same as l3 mode for
non-multicast packet, so use the existing func ipvlan_handle_mode_l3
instead of these duplicated statements in non-multicast case.
Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jiri Pirko [Wed, 6 Dec 2017 08:41:12 +0000 (09:41 +0100)]
mlxsw: spectrum: handle NETIF_F_HW_TC changes correctly
Currently, whenever the NETIF_F_HW_TC feature changes, we silently
always allow it, but we actually do not disable the flows in HW
on disable. That breaks user's expectations. So just forbid
the feature disable in case there are any filters offloaded.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Willem de Bruijn [Wed, 6 Dec 2017 03:11:17 +0000 (22:11 -0500)]
tun: avoid unnecessary READ_ONCE in tun_net_xmit
The statement no longer serves a purpose.
Commit
fa35864e0bb7 ("tuntap: Fix for a race in accessing numqueues")
added the ACCESS_ONCE to avoid a race condition with skb_queue_len.
Commit
436accebb530 ("tuntap: remove unnecessary sk_receive_queue
length check during xmit") removed the affected skb_queue_len check.
Commit
96f84061620c ("tun: add eBPF based queue selection method")
split the function, reading the field a second time in the callee.
The temp variable is now only read once, so just remove it.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Prashant Bhole [Wed, 6 Dec 2017 01:47:04 +0000 (10:47 +0900)]
rds: debug: fix null check on static array
t_name cannot be NULL since it is an array field of a struct.
Replacing null check on static array with string length check using
strnlen()
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cong Wang [Wed, 6 Dec 2017 00:17:27 +0000 (16:17 -0800)]
act_mirred: get rid of mirred_list_lock spinlock
TC actions are no longer freed in RCU callbacks and we should
always have RTNL lock, so this spinlock is no longer needed.
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cong Wang [Wed, 6 Dec 2017 00:17:26 +0000 (16:17 -0800)]
act_mirred: get rid of tcfm_ifindex from struct tcf_mirred
tcfm_dev always points to the correct netdev and we already
hold a refcnt, so no need to use tcfm_ifindex to lookup again.
If we would support moving target netdev across netns, using
pointer would be better than ifindex.
This also fixes dumping obsolete ifindex, now after the
target device is gone we just dump 0 as ifindex.
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Wed, 6 Dec 2017 19:45:29 +0000 (14:45 -0500)]
Merge branch 'ipv6-add-ip6erspan-collect_md-mode'
William Tu says:
====================
ipv6: add ip6erspan collect_md mode
Similar to erspan collect_md mode in ipv4, the first patch adds
support for ip6erspan collect metadata mode. The second patch
adds the test case using bpf_skb_[gs]et_tunnel_key helpers.
The corresponding iproute2 patch:
https://marc.info/?l=linux-netdev&m=
151251545410047&w=2
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
William Tu [Tue, 5 Dec 2017 23:15:45 +0000 (15:15 -0800)]
samples/bpf: add ip6erspan sample code
Extend the existing tests for ip6erspan.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
William Tu [Tue, 5 Dec 2017 23:15:44 +0000 (15:15 -0800)]
ip6_gre: add ip6 erspan collect_md mode
Similar to ip6 gretap and ip4 gretap, the patch allows
erspan tunnel to operate in collect metadata mode.
bpf_skb_[gs]et_tunnel_key() helpers can make use of
it right away.
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Dan Carpenter [Tue, 5 Dec 2017 14:37:52 +0000 (17:37 +0300)]
bnxt_en: Uninitialized variable in bnxt_tc_parse_actions()
Smatch warns that:
drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c:160 bnxt_tc_parse_actions()
error: uninitialized symbol 'rc'.
"rc" is either uninitialized or set to zero here so we can just remove
the check.
Fixes: 8c95f773b4a3 ("bnxt_en: add support for Flower based vxlan encap/decap offload")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Wed, 6 Dec 2017 01:08:04 +0000 (20:08 -0500)]
Merge branch 'macb-rx-filter-cleanups'
Julia Cartwright says:
====================
macb rx filter cleanups
Here's a proper patchset based on net-next.
v1 -> v2:
- Rebased on net-next
- Add Nicolas's Acks
- Reorder commits, putting the list_empty() cleanups prior to the
others.
- Added commit reverting the GFP_ATOMIC change.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Julia Cartwright [Wed, 6 Dec 2017 00:02:50 +0000 (18:02 -0600)]
net: macb: change GFP_ATOMIC to GFP_KERNEL
Now that the rx_fs_lock is no longer held across allocation, it's safe
to use GFP_KERNEL for allocating new entries.
This reverts commit
81da3bf6e3f88 ("net: macb: change GFP_KERNEL to
GFP_ATOMIC").
Cc: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Julia Cartwright [Wed, 6 Dec 2017 00:02:49 +0000 (18:02 -0600)]
net: macb: reduce scope of rx_fs_lock-protected regions
Commit
ae8223de3df5 ("net: macb: Added support for RX filtering")
introduces a lock, rx_fs_lock which is intended to protect the list of
rx_flow items and synchronize access to the hardware rx filtering
registers.
However, the region protected by this lock is overscoped, unnecessarily
including things like slab allocation. Reduce this lock scope to only
include operations which must be performed atomically: list traversal,
addition, and removal, and hitting the macb filtering registers.
This fixes the use of kmalloc w/ GFP_KERNEL in atomic context.
Fixes: ae8223de3df5 ("net: macb: Added support for RX filtering")
Cc: Rafal Ozieblo <rafalo@cadence.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Julia Cartwright [Wed, 6 Dec 2017 00:02:48 +0000 (18:02 -0600)]
net: macb: kill useless use of list_empty()
The list_for_each_entry() macro already handles the case where the list
is empty (by not executing the loop body). It's not necessary to handle
this case specially, so stop doing so.
Cc: Rafal Ozieblo <rafalo@cadence.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cong Wang [Tue, 5 Dec 2017 20:53:07 +0000 (12:53 -0800)]
net_sched: remove unused parameter from act cleanup ops
No one actually uses it.
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 23:01:34 +0000 (18:01 -0500)]
Merge branch 'dsa-use-per-port-upstream-port'
Vivien Didelot says:
====================
net: dsa: use per-port upstream port
An upstream port is a local switch port used to reach a CPU port.
DSA still considers a unique CPU port in the whole switch fabric and
thus return a unique upstream port for a given switch. This is wrong in
a multiple CPU ports environment.
We are now switching to using the dedicated CPU port assigned to each
port in order to get rid of the deprecated unique tree CPU port.
This patchset makes the dsa_upstream_port() helper take a port argument
and goes one step closer complete support for multiple CPU ports.
Changes in v2:
- reverse-christmas-tree-fy variables
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Vivien Didelot [Tue, 5 Dec 2017 20:34:13 +0000 (15:34 -0500)]
net: dsa: return per-port upstream port
The current dsa_upstream_port() helper still assumes a unique CPU port
in the whole switch fabric. This is becoming wrong, as every port in the
fabric has its dedicated CPU port, thus every port has an upstream port.
Add a port argument to the dsa_upstream_port() helper and fetch its CPU
port instead of the deprecated unique fabric CPU port. A CPU or unused
port has no dedicated CPU port, so return itself in this case.
At the same time, change the return value from u8 to unsigned int since
there is no need to limit the size here.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vivien Didelot [Tue, 5 Dec 2017 20:34:12 +0000 (15:34 -0500)]
net: dsa: assign a CPU port to DSA port
DSA ports also need to have a dedicated CPU port assigned to them,
because they need to know where to egress frames targeting the CPU,
e.g. To_Cpu frames received on a Marvell Tag port.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vivien Didelot [Tue, 5 Dec 2017 20:34:11 +0000 (15:34 -0500)]
net: dsa: mv88e6xxx: setup global upstream port
Move the setup of the global upstream port within the
mv88e6xxx_setup_upstream_port function.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vivien Didelot [Tue, 5 Dec 2017 20:34:10 +0000 (15:34 -0500)]
net: dsa: mv88e6xxx: helper to setup upstream port
Add a helper function to setup the upstream port of a given port.
This is the port used to reach the dedicated CPU port. This function
will be extended later to setup the global upstream port as well.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Vivien Didelot [Tue, 5 Dec 2017 20:34:09 +0000 (15:34 -0500)]
net: dsa: mv88e6xxx: egress floods all DSA ports
The mv88e6xxx driver currently assumes a single CPU port in the fabric
and thus floods frames with unknown DA on a single DSA port, the one
that is one hop closer to the CPU port.
With multiple CPU ports in mind, this isn't true anymore because CPU
ports could be found behind both DSA ports of a device in-between
others.
For example in a A <-> B <-> C fabric, both A and C having CPU ports,
device B will have to flood such frame to its two DSA ports.
This patch considers both CPU and DSA ports of a device as upstream
ports, where to flood frames with unknown DA addresses.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 20:04:27 +0000 (15:04 -0500)]
Merge branch 'sch_api-style'
Alexander Aring says:
====================
net: sched: sch_api: fix coding style issues for extack
this patch prepares to handle extack for qdiscs and fixes checkpatch
issues.
There are a bunch of warnings issued by checkpatch which bothered me.
This first patchset is to get rid of those warnings to make way for
the next patchsets.
I plan to followup with qdiscs, classifiers and actions after this.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Alexander Aring [Mon, 4 Dec 2017 23:40:00 +0000 (18:40 -0500)]
net: sched: sch_api: rearrange init handling
This patch fixes the following checkpatch error:
ERROR: do not use assignment in if condition
by rearranging the if condition to execute init callback only if init
callback exists. The whole setup afterwards is called in any case,
doesn't matter if init callback is set or not. This patch has the same
behaviour as before, just without assign err variable in if condition.
It also makes the code easier to read.
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Alexander Aring [Mon, 4 Dec 2017 23:39:59 +0000 (18:39 -0500)]
net: sched: sch_api: fix code style issues
This patch fix checkpatch issues for upcomming patches according to the
sched api file. It changes checking on null pointer, remove unnecessary
brackets, add variable names for parameters and adjust 80 char width.
Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 20:01:03 +0000 (15:01 -0500)]
Merge branch 'nfp-enhanced-debug-dump-via-ethtool'
Simon Horman says:
====================
nfp: enhanced debug dump via ethtool
Add debug dump implementation to the NFP driver. This makes use of
existing ethtool infrastructure. ethtool -W is used to select the dump
level and ethtool -w is used to dump NFP state.
The existing behaviour of dump level 0, dumping the arm.diag resource, is
preserved. Dump levels greater than 0 are implemented by this patchset and
optionally supported by firmware providing a _abi_dump_spec rtsym. This
rtsym provides a specification, in TLV format, of the information to be
dumped from the NFP at each supported dump level.
Dumps are also structured using a TLVs. They consist a prolog and the data
described int he corresponding dump.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:21 +0000 (23:34 +0100)]
nfp: dump indirect ME CSRs
- The spec defines CSR address ranges for indirect ME CSRs. For Each TLV
chunk in the spec, dump a chunk that includes the spec and the data
over the defined address range.
- Each indirect CSR has 8 contexts. To read one context, first write the
context to a specific derived address, read it back, and then read the
register value.
- For each address, read and dump all 8 contexts in this manner.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:20 +0000 (23:34 +0100)]
nfp: dump CPP, XPB and direct ME CSRs
- The spec defines CSR address ranges for these types.
- Dump each TLV chunk in the spec as a chunk that includes the spec and
the data over the defined address range.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:19 +0000 (23:34 +0100)]
nfp: dump firmware name
Dump FW name as TLV, based on dump specification.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:18 +0000 (23:34 +0100)]
nfp: dump single hwinfo field by key
- Add spec TLV for hwinfo field, containing key string as data.
- Add dump TLV for hwinfo field, with data being key and value as packed
zero-terminated strings.
- If specified hwinfo field is not found, dump the spec TLV as -ENOENT
error.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:17 +0000 (23:34 +0100)]
nfp: dump all hwinfo
- Dump hwinfo as separate TLV chunk, in a packed format containing
zero-separated key and value strings.
- This provides additional debug context, if requested by the dumpspec.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:16 +0000 (23:34 +0100)]
nfp: dump rtsyms
- Support rtsym TLVs.
- If specified rtsym is not found, dump the spec TLV as -ENOENT error.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:15 +0000 (23:34 +0100)]
nfp: dumpspec TLV traversal
- Perform dumpspec traversals for calculating size and populating the
dump.
- Initially, wrap all spec TLVs in dump error TLVs (changed by later
patches in the series).
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:14 +0000 (23:34 +0100)]
nfp: dump prolog
- Use a TLV structure, with the typed chunks aligned to 8-byte sizes.
- Dump numeric fields as big-endian.
- Prolog contains the dump level.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:13 +0000 (23:34 +0100)]
nfp: load debug dump spec
Load the TLV-based binary specification of what needs to be included in
a dump, from the "_abi_dump_spec" rtsymbol. If the symbol is not defined,
then dumps for levels >= 1 are not supported.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Carl Heymann [Mon, 4 Dec 2017 22:34:12 +0000 (23:34 +0100)]
nfp: debug dump ethtool ops
- Skeleton code to perform a binary debug dump via ethtoolops
"set_dump", "get_dump_flags" and "get_dump_data", i.e. the ethtool
-W/w mechanism.
- Skeleton functions for debugdump operations provided.
- An integer "dump level" can be specified, this is stored between
ethtool invocations. Dump level 0 is still the "arm.diag" resource for
backward compatibility. Other dump levels each define a set of state
information to include in the dump, driven by a spec from FW.
Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cong Wang [Mon, 4 Dec 2017 18:48:18 +0000 (10:48 -0800)]
net_sched: get rid of rcu_barrier() in tcf_block_put_ext()
Both Eric and Paolo noticed the rcu_barrier() we use in
tcf_block_put_ext() could be a performance bottleneck when
we have a lot of tc classes.
Paolo provided the following to demonstrate the issue:
tc qdisc add dev lo root htb
for I in `seq 1 1000`; do
tc class add dev lo parent 1: classid 1:$I htb rate 100kbit
tc qdisc add dev lo parent 1:$I handle $((I + 1)): htb
for J in `seq 1 10`; do
tc filter add dev lo parent $((I + 1)): u32 match ip src 1.1.1.$J
done
done
time tc qdisc del dev root
real 0m54.764s
user 0m0.023s
sys 0m0.000s
The rcu_barrier() there is to ensure we free the block after all chains
are gone, that is, to queue tcf_block_put_final() at the tail of workqueue.
We can achieve this ordering requirement by refcnt'ing tcf block instead,
that is, the tcf block is freed only when the last chain in this block is
gone. This also simplifies the code.
Paolo reported after this patch we get:
real 0m0.017s
user 0m0.000s
sys 0m0.017s
Tested-by: Paolo Abeni <pabeni@redhat.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 19:45:02 +0000 (14:45 -0500)]
Merge branch 'ieee802154-for-davem-2017-12-04' of git://git./linux/kernel/git/sschmidt/wpan-next
Stefan Schmidt says:
====================
pull-request: ieee802154-next 2017-12-04
Some update from ieee802154 to *net-next*
Jian-Hong Pan updated our docs to match the APIs in code.
Michael Hennerichs enhanced the
adf7242 driver to work with
adf7241
devices and reworked the IRQ and packet handling in the driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Colin Ian King [Mon, 4 Dec 2017 12:56:09 +0000 (12:56 +0000)]
netdevsim: make functions nsim_bpf_create_prog and nsim_bpf_destroy_prog static
Functions nsim_bpf_create_prog and nsim_bpf_destroy_prog are local to the
source and do not need to be in global scope, so make them static.
Cleans up sparse warnings:
symbol 'nsim_bpf_create_prog' was not declared. Should it be static?
symbol 'nsim_bpf_destroy_prog' was not declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 17:51:20 +0000 (12:51 -0500)]
Merge branch 'phylib-hard-resetting-devices'
Geert Uytterhoeven says:
====================
Teach phylib hard-resetting devices
This patch series adds optional PHY reset support to phylib.
The first two patches are destined for David's net-next tree. They add
core PHY reset code, and update a driver that currently uses its own
reset code.
The last two patches are destined for Simon's renesas tree. They add
properties to describe the EthernetAVB PHY reset topology to the common
Salvator-X/XS and ULCB DTS files, which solves two issues:
1. On Salvator-XS, the enable pin of the regulator providing PHY power
is connected to PRESETn, and PSCI powers down the SoC during system
suspend. Hence a PHY reset is needed to restore network
functionality after system resume.
2. Linux should not rely on the boot loader having reset the PHY, but
should reset the PHY during driver probe.
Changes compared to v3:
- Remove Florian's Acked-by,
- Add missing #include <linux/gpio/consumer.h>,
- Re-add the gpiod check, as the dummy gpiod_set_value() for !GPIOLIB
does not ignore NULL, and calls WARN_ON(1),
- Do not reassert the reset signal if {mdio,phy}_probe() or
phy_device_register() succeeded, as that may destroy initial setup,
- Do not deassert the reset signal in {mdio,phy}_remove(), as it
should already be deasserted,
- Bring the PHY back into reset state in phy_device_remove(),
- Move/consolidate GPIO descriptor acquiring code from
of_mdiobus_register_phy() and of_mdiobus_register_device() to
mdiobus_register_device().
Note that this changes behavior slightly, in that the reset signal
is now also asserted when called from of_mdiobus_register_device().
- Add Reviewed-by,
Changes compared to v2, as sent by Sergei Shtylyov:
- Fix fwnode_get_named_gpiod() call due to added parameters (which
allowed to eliminate the gpiod_direction_output() call),
- Rebased, refreshed, reworded,
- Take over from Sergei,
- Add Acked-by,
- Remove unneeded gpiod check, as gpiod_set_value() handles NULL fine,
- Handle fwnode_get_named_gpiod() errors correctly:
- -ENOENT is ignored (the GPIO is optional), and turned into NULL,
which allowed to remove all later !IS_ERR() checks,
- Other errors (incl. -EPROBE_DEFER) are propagated,
- Extract DTS patches from series "[PATCH 0/4] ravb: Add PHY reset
support" (https://www.spinics.net/lists/netdev/msg457308.html), and
incorporate in this series, after moving reset-gpios from the
ethernet to the ethernet-phy node.
Given (1) the new reset-gpios DT property in the PHY node follows
established practises, (2) the DT binding change in the first patch has
been acked by Rob, and (3) the DTS patch does not cause any regressions
if it is applied before the PHY driver patches, the DTS patches can be
applied independently.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Sergei Shtylyov [Mon, 4 Dec 2017 10:34:50 +0000 (11:34 +0100)]
macb: Kill PHY reset code
With the phylib now being aware of the "reset-gpios" PHY node property,
there should be no need to frob the PHY reset in this driver anymore...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
Sergei Shtylyov [Mon, 4 Dec 2017 12:35:05 +0000 (13:35 +0100)]
phylib: Add device reset GPIO support
The PHY devices sometimes do have their reset signal (maybe even power
supply?) tied to some GPIO and sometimes it also does happen that a boot
loader does not leave it deasserted. So far this issue has been attacked
from (as I believe) a wrong angle: by teaching the MAC driver to manipulate
the GPIO in question; that solution, when applied to the device trees, led
to adding the PHY reset GPIO properties to the MAC device node, with one
exception: Cadence MACB driver which could handle the "reset-gpios" prop
in a PHY device subnode. I believe that the correct approach is to teach
the 'phylib' to get the MDIO device reset GPIO from the device tree node
corresponding to this device -- which this patch is doing...
Note that I had to modify the AT803x PHY driver as it would stop working
otherwise -- it made use of the reset GPIO for its own purposes...
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Rob Herring <robh@kernel.org>
[geert: Propagate actual errors from fwnode_get_named_gpiod()]
[geert: Avoid destroying initial setup]
[geert: Consolidate GPIO descriptor acquiring code]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Simon Horman [Mon, 4 Dec 2017 10:31:48 +0000 (11:31 +0100)]
flow_dissector: dissect tunnel info outside __skb_flow_dissect()
Move dissection of tunnel info to outside of the main flow dissection
function, __skb_flow_dissect(). The sole user of this feature, the flower
classifier, is updated to call tunnel info dissection directly, using
skb_flow_dissect_tunnel_info().
This results in a slightly less complex implementation of
__skb_flow_dissect(), in particular removing logic from that call path
which is not used by the majority of users. The expense of this is borne by
the flower classifier which now has to make an extra call for tunnel info
dissection.
This patch should not result in any behavioural change.
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Jason Wang [Mon, 4 Dec 2017 09:31:23 +0000 (17:31 +0800)]
tun: add eBPF based queue selection method
This patch introduces an eBPF based queue selection method. With this,
the policy could be offloaded to userspace completely through a new
ioctl TUNSETSTEERINGEBPF.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 16:45:18 +0000 (11:45 -0500)]
Merge branch 'hns3-reset-refactor'
Salil Mehta says:
====================
net: hns3: Refactors "reset" handling code in HCLGE layer of HNS3 driver
This patch refactors the code of the reset feature in HCLGE layer
of HNS3 PF driver. Prime motivation to do this change is:
1. To reduce the time for which common miscellaneous Vector 0
interrupt is disabled because of the reset. Simplification
of the common miscellaneous interrupt handler routine(for
Vector 0) used to handle reset and other sources of Vector
0 interrupt.
2. Separate the task for handling the reset
3. Simplification of reset request submission and pending reset
logic.
To achieve above below few things have been done:
1. Interrupt is disabled while common miscellaneous interrupt
handler is entered and re-enabled before it is exit. This
reduces the interrupt handling latency as compared to older
interrupt handling scheme where interrupt was being disabled
in interrupt handler context and re-enabled in task context
some time later. Made Miscellaneous interrupt handler more
generic to handle all sources including reset interrupt source.
2. New reset service task has been introduced to service the
reset handling.
3. Introduces new reset service task for honoring software reset
requests like from network stack related to timeout and serving
the pending reset request(to reset the driver and associated
clients).
Change Log:
Patch V2: Addressed comment by Andrew Lunn
Link: https://lkml.org/lkml/2017/12/1/366
Patch V1: Initial Submit
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Salil Mehta [Mon, 4 Dec 2017 01:29:55 +0000 (01:29 +0000)]
net: hns3: Refactors the requested reset & pending reset handling code
In exisiting code, the way to detect if driver/client reset should
be executed or if hardware should be be soft resetted was overly
complex.
Existing code use to read the interrupt status register from task
context to figure out if the interrupt source event was reset and
then use clear the interrupt source for reset while waiting for the
hardware to finish the reset. This behaviour again was confusing
and overly complex in terms of the flow.
This patch simplifies the handling of the requested reset and the
pending reset(i.e. reset which have already been asserted by the
software and hardware has acknowledged back to driver that it is
processing the hardware reset through interrupt)
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Salil Mehta [Mon, 4 Dec 2017 01:29:54 +0000 (01:29 +0000)]
net: hns3: Add reset service task for handling reset requests
Existing common service task was being used to service the reset
requests. This patch tries to make the handling of reset cleaner
by separating task to handle the reset requests. This might in
turn help in adapting similar handling approach for other
interrupt events like mailbox, sharing vector 0 interrupt.
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Salil Mehta [Mon, 4 Dec 2017 01:29:53 +0000 (01:29 +0000)]
net: hns3: Refactor of the reset interrupt handling logic
The reset interrupt event shares common miscellaneous interrupt
Vector 0. In the existing reset interrupt handling we disable
the Vector 0 interrupt in misc interrupt handler and re-enable
them later in context to common service task.
This also means other event sources like mailbox would also be
deferred or if the interrupt event was due to mailbox(which shall
be supported for VF soon), it could delay the reset handling.
This patch reorganizes the reset interrupt handling logic and
makes it more fair to other events.
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Julia Lawall [Sat, 2 Dec 2017 07:01:21 +0000 (08:01 +0100)]
net: macb: change GFP_KERNEL to GFP_ATOMIC
Function gem_add_flow_filter called on line 2958 inside lock on line 2949
but uses GFP_KERNEL
Generated by: scripts/coccinelle/locks/call_kern.cocci
Fixes: ae8223de3df5 ("net: macb: Added support for RX filtering")
CC: Rafal Ozieblo <rafalo@cadence.com>
Signed-off-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
David S. Miller [Tue, 5 Dec 2017 16:16:20 +0000 (11:16 -0500)]
Merge branch 'SFP-phylink-updates'
Russell King says:
====================
SFP/phylink updates
This series, which follows on from the fixes posted earlier, improves
the phylink/sfp support. Changes included here are:
- Merge 802.3z and SGMII modes into one "in-band" mode, using the
PHY_INTERFACE_MODE_xxx definition to determine which should be used.
This allows more flexibility as more interface modes become
available.
- Allow 2500base-X and 10GBASE-KR to be requested from SFP.
- Remove unused and unnecessary phylink_init_eee()
- Restart 802.3z autonegotiation when starting the network device to
ensure that the negotiated parameters are always correct. It has
been observed on mvneta that this is not always the case without
this change.
- Add kerneldoc documentation for phylink and sfp upstream facing APIs
and link it in to the networking documentation.
- Resolve a sparse warning in sfp-bus.c
- Convert phylink/sfp to use fwnode rather than DT so that other firmware
systems can take advantage of this - I have received a request for it
to be usable with ACPI. The exception to this is our interactions with
phylib, as phylib itself does not yet support fwnode.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:25:09 +0000 (10:25 +0000)]
phylink: convert to fwnode
Convert phylink to fwnode, switching phylink_create() from taking a
device_node to taking a fwnode_handle. This will allow other firmware
systems to take advantage of sfp/phylink support.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:25:03 +0000 (10:25 +0000)]
sfp: convert to fwnode
Convert sfp-bus to use fwnode rather than device_node internally, so
we can support more than just device tree firmware.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:58 +0000 (10:24 +0000)]
sfp: fix sparse warning
drivers/net/phy/sfp-bus.c:298:13: warning: context imbalance in 'sfp_bus_release' - wrong count at exit
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:53 +0000 (10:24 +0000)]
sfp: add documentation for kernel APIs
Add kernel-doc documentation for sfp kernel APIs, and link it into the
networking kapi documentation under "Network device support".
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:47 +0000 (10:24 +0000)]
phylink: add documentation for kernel APIs
Add kernel-doc documentation for phylink kernel APIs, and link it into
the networking kapi documentation under "Network device support".
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:42 +0000 (10:24 +0000)]
phylink: restart 802.3z negotiation when starting net device
Restart 802.3z negotiation when the net device is brought up to ensure
that the link partner has our current link modes.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:37 +0000 (10:24 +0000)]
phylink: remove phylink_init_eee()
phylink_init_eee() serves no purpose, remove it.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:32 +0000 (10:24 +0000)]
phylink: add support for 2500baseX and 10GbaseKR
Add support for handling the faster 2.5G and 10G link modes when used
with SFP modules.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:26 +0000 (10:24 +0000)]
phylink: get rid of separate Cisco SGMII and 802.3z modes
Since the handling of SGMII and 802.3z is now the same, combine the
MLO_AN_xxx constants into a single MLO_AN_INBAND, and use the PHY
interface mode to distinguish between Cisco SGMII and 802.3z.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:21 +0000 (10:24 +0000)]
phylink: merge SGMII and 802.3z handling
The code handling SGMII and 802.3z is essentially the same, except that
we assume 802.3z has no PHY. Re-organise the code such that these cases
are merged, and exclude 802.3z mode from having a PHY attached. This
results in the same link handling behaviour as before.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Russell King [Fri, 1 Dec 2017 10:24:16 +0000 (10:24 +0000)]
phy: add phy_interface_mode_is_8023z() helper
Add and use phy_interface_mode_is_8023z() helper to identify the
interface modes that use 802.3z negotiation. Use it in phylink's
phylink_mac_an_restart().
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Florian Westphal [Mon, 4 Dec 2017 21:42:30 +0000 (22:42 +0100)]
rtnetlink: fix rtnl_link msghandler rcu annotations
Incorrect/missing annotations caused a few sparse warnings:
rtnetlink.c:155:15: incompatible types .. (different address spaces)
rtnetlink.c:157:23: incompatible types .. (different address spaces)
rtnetlink.c:185:15: incompatible types .. (different address spaces)
rtnetlink.c:285:15: incompatible types .. (different address spaces)
rtnetlink.c:317:9: incompatible types .. (different address spaces)
rtnetlink.c:3054:23: incompatible types .. (different address spaces)
no change in generated code.
Fixes: addf9b90de22f7 ("net: rtnetlink: use rcu to free rtnl message handlers")
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>