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  1. 29 Apr, 2016 26 commits
  3. 28 Apr, 2016 14 commits
    • Mahesh Bandewar's avatar
      ipvlan: Fix failure path in dev registration during link creation · 494e8489
      Mahesh Bandewar authored 
      When newlink creation fails at device-registration, the port->count
is decremented twice. Francesco Ruggeri (fruggeri@arista.com) found
this issue in Macvlan and the same exists in IPvlan driver too.

While fixing this issue I noticed another issue of missing unregister
in case of failure, so adding it to the fix which is similar to the
macvlan fix by Francesco in commit 30837960 ("macvlan: fix failure
during registration v3")
Reported-by: default avatarFrancesco Ruggeri <fruggeri@arista.com>
Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
CC: Eric Dumazet <edumazet@google.com>
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      494e8489
    • françois romieu's avatar
      pch_gbe: replace private tx ring lock with common netif_tx_lock · 222e4d0b
      françois romieu authored 
      pch_gbe_tx_ring.tx_lock is only used in the hard_xmit handler and
in the transmit completion reaper called from NAPI context.

Compile-tested only. Potential victims Cced.

Someone more knowledgeable may check if pch_gbe_tx_queue could
have some use for a mmiowb.
Signed-off-by: default avatarFrancois Romieu <romieu@fr.zoreil.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Andy Cress <andy.cress@us.kontron.com>
Cc: bryan@fossetcon.org
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      222e4d0b
    • Florian Fainelli's avatar
      net: dsa: Provide CPU port statistics to master netdev · badf3ada
      Florian Fainelli authored 
      This patch overloads the DSA master netdev, aka CPU Ethernet MAC to also
include switch-side statistics, which is useful for debugging purposes,
when the switch is not properly connected to the Ethernet MAC (duplex
mismatch, (RG)MII electrical issues etc.).

We accomplish this by retaining the original copy of the master netdev's
ethtool_ops, and just overload the 3 operations we care about:
get_sset_count, get_strings and get_ethtool_stats so as to intercept
these calls and call into the original master_netdev ethtool_ops, plus
our own.

We take this approach as opposed to providing a set of DSA helper
functions that would retrive the CPU port's statistics, because the
entire purpose of DSA is to allow unmodified Ethernet MAC drivers to be
used as CPU conduit interfaces, therefore, statistics overlay in such
drivers would simply not scale.

The new ethtool -S <iface> output would therefore look like this now:
<iface> statistics
p<2 digits cpu port number>_<switch MIB counter names>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      badf3ada
    • Eric Dumazet's avatar
      tcp: give prequeue mode some care · 0cef6a4c
      Eric Dumazet authored 
      TCP prequeue goal is to defer processing of incoming packets
to user space thread currently blocked in a recvmsg() system call.

Intent is to spend less time processing these packets on behalf
of softirq handler, as softirq handler is unfair to normal process
scheduler decisions, as it might interrupt threads that do not
even use networking.

Current prequeue implementation has following issues :

1) It only checks size of the prequeue against sk_rcvbuf

   It was fine 15 years ago when sk_rcvbuf was in the 64KB vicinity.
   But we now have ~8MB values to cope with modern networking needs.
   We have to add sk_rmem_alloc in the equation, since out of order
   packets can definitely use up to sk_rcvbuf memory themselves.

2) Even with a fixed memory truesize check, prequeue can be filled
   by thousands of packets. When prequeue needs to be flushed, either
   from sofirq context (in tcp_prequeue() or timer code), or process
   context (in tcp_prequeue_process()), this adds a latency spike
   which is often not desirable.
   I added a fixed limit of 32 packets, as this translated to a max
   flush time of 60 us on my test hosts.

   Also note that all packets in prequeue are not accounted for tcp_mem,
   since they are not charged against sk_forward_alloc at this point.
   This is probably not a big deal.

Note that this might increase LINUX_MIB_TCPPREQUEUEDROPPED counts,
which is misnamed, as packets are not dropped at all, but rather pushed
to the stack (where they can be either consumed or dropped)
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0cef6a4c
    • Michal Kazior's avatar
      fq: split out backlog update logic · b43e7199
      Michal Kazior authored 
      mac80211 (which will be the first user of the
fq.h) recently started to support software A-MSDU
aggregation. It glues skbuffs together into a
single one so the backlog accounting needs to be
more fine-grained.

To avoid backlog sorting logic duplication split
it up for re-use.
Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b43e7199
    • Dan Carpenter's avatar
      tipc: remove an unnecessary NULL check · b4358657
      Dan Carpenter authored 
      This is never called with a NULL "buf" and anyway, we dereference 's' on
the lines before so it would Oops before we reach the check.
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b4358657
    • Arnd Bergmann's avatar
      net/mlx5e: avoid stack overflow in mlx5e_open_channels · 6b87663f
      Arnd Bergmann authored 
      struct mlx5e_channel_param is a large structure that is allocated
on the stack of mlx5e_open_channels, and with a recent change
it has grown beyond the warning size for the maximum stack
that a single function should use:

mellanox/mlx5/core/en_main.c: In function 'mlx5e_open_channels':
mellanox/mlx5/core/en_main.c:1325:1: error: the frame size of 1072 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

The function is already using dynamic allocation and is not in
a fast path, so the easiest workaround is to use another kzalloc
for allocating the channel parameters.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Fixes: d3c9bc27 ("net/mlx5e: Added ICO SQs")
Acked-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6b87663f
    • Jason Wang's avatar
      tuntap: calculate rps hash only when needed · 3df97ba8
      Jason Wang authored 
      There's no need to calculate rps hash if it was not enabled. So this
patch export rps_needed and check it before trying to get rps
hash. Tests (using pktgen to inject packets to guest) shows this can
improve pps about 13% (when rps is disabled).

Before:
~1150000 pps
After:
~1300000 pps

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
----
Changes from V1:
- Fix build when CONFIG_RPS is not set
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3df97ba8
    • David S. Miller's avatar
      Merge branch 'tcp-eor' · f345c9a5
      David S. Miller authored 
      Martin KaFai Lau says:

====================
tcp: Make use of MSG_EOR in tcp_sendmsg

v4:
~ Do not set eor bit in do_tcp_sendpages() since there is
  no way to pass MSG_EOR from the userland now.
~ Avoid rmw by testing MSG_EOR first in tcp_sendmsg().
~ Move TCP_SKB_CB(skb)->eor test to a new helper
  tcp_skb_can_collapse_to() (suggested by Soheil).
~ Add some packetdrill tests.

v3:
~ Separate EOR marking from the SKBTX_ANY_TSTAMP logic.
~ Move the eor bit test back to the loop in tcp_sendmsg and
  tcp_sendpage because there could be >1 threads doing
  sendmsg.
~ Thanks to Eric Dumazet's suggestions on v2.
~ The TCP timestamp bug fixes are separated into other threads.

v2:
~ Rework based on the recent work
  "add TX timestamping via cmsg" by
  Soheil Hassas Yeganeh <soheil.kdev@gmail.com>
~ This version takes the MSG_EOR bit as a signal of
  end-of-response-message and leave the selective
  timestamping job to the cmsg
~ Changes based on the v1 feedback (like avoid
  unlikely check in a loop and adding tcp_sendpage
  support)
~ The first 3 patches are bug fixes.  The fixes in this
  series depend on the newly introduced txstamp_ack in
  net-next.  I will make relevant patches against net after
  getting some feedback.
~ The test results are based on the recently posted net fix:
  "tcp: Fix SOF_TIMESTAMPING_TX_ACK when handling dup acks"

One potential use case is to use MSG_EOR with
SOF_TIMESTAMPING_TX_ACK to get a more accurate
TCP ack timestamping on application protocol with
multiple outgoing response messages (e.g. HTTP2).

One of our use case is at the webserver.  The webserver tracks
the HTTP2 response latency by measuring when the webserver sends
the first byte to the socket till the TCP ACK of the last byte
is received.  In the cases where we don't have client side
measurement, measuring from the server side is the only option.
In the cases we have the client side measurement, the server side
data can also be used to justify/cross-check-with the client
side data.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f345c9a5
    • Martin KaFai Lau's avatar
      tcp: Handle eor bit when fragmenting a skb · a166140e
      Martin KaFai Lau authored 
      When fragmenting a skb, the next_skb should carry
the eor from prev_skb.  The eor of prev_skb should
also be reset.

Packetdrill script for testing:
~~~~~~
+0 `sysctl -q -w net.ipv4.tcp_min_tso_segs=10`
+0 `sysctl -q -w net.ipv4.tcp_no_metrics_save=1`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0

0.100 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
0.100 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 7>
0.200 < . 1:1(0) ack 1 win 257
0.200 accept(3, ..., ...) = 4
+0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0

0.200 sendto(4, ..., 15330, MSG_EOR, ..., ...) = 15330
0.200 sendto(4, ..., 730, 0, ..., ...) = 730

0.200 > .  1:7301(7300) ack 1
0.200 > . 7301:14601(7300) ack 1

0.300 < . 1:1(0) ack 14601 win 257
0.300 > P. 14601:15331(730) ack 1
0.300 > P. 15331:16061(730) ack 1

0.400 < . 1:1(0) ack 16061 win 257
0.400 close(4) = 0
0.400 > F. 16061:16061(0) ack 1
0.400 < F. 1:1(0) ack 16062 win 257
0.400 > . 16062:16062(0) ack 2
Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a166140e
    • Martin KaFai Lau's avatar
      tcp: Handle eor bit when coalescing skb · a643b5d4
      Martin KaFai Lau authored 
      This patch:
1. Prevent next_skb from coalescing to the prev_skb if
   TCP_SKB_CB(prev_skb)->eor is set
2. Update the TCP_SKB_CB(prev_skb)->eor if coalescing is
   allowed

Packetdrill script for testing:
~~~~~~
+0 `sysctl -q -w net.ipv4.tcp_min_tso_segs=10`
+0 `sysctl -q -w net.ipv4.tcp_no_metrics_save=1`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0

0.100 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
0.100 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 7>
0.200 < . 1:1(0) ack 1 win 257
0.200 accept(3, ..., ...) = 4
+0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0

0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730
0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730
0.200 write(4, ..., 11680) = 11680

0.200 > P. 1:731(730) ack 1
0.200 > P. 731:1461(730) ack 1
0.200 > . 1461:8761(7300) ack 1
0.200 > P. 8761:13141(4380) ack 1

0.300 < . 1:1(0) ack 1 win 257 <sack 1461:13141,nop,nop>
0.300 > P. 1:731(730) ack 1
0.300 > P. 731:1461(730) ack 1
0.400 < . 1:1(0) ack 13141 win 257

0.400 close(4) = 0
0.400 > F. 13141:13141(0) ack 1
0.500 < F. 1:1(0) ack 13142 win 257
0.500 > . 13142:13142(0) ack 2
Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a643b5d4
    • Martin KaFai Lau's avatar
      tcp: Make use of MSG_EOR in tcp_sendmsg · c134ecb8
      Martin KaFai Lau authored 
      This patch adds an eor bit to the TCP_SKB_CB.  When MSG_EOR
is passed to tcp_sendmsg, the eor bit will be set at the skb
containing the last byte of the userland's msg.  The eor bit
will prevent data from appending to that skb in the future.

The change in do_tcp_sendpages is to honor the eor set
during the previous tcp_sendmsg(MSG_EOR) call.

This patch handles the tcp_sendmsg case.  The followup patches
will handle other skb coalescing and fragment cases.

One potential use case is to use MSG_EOR with
SOF_TIMESTAMPING_TX_ACK to get a more accurate
TCP ack timestamping on application protocol with
multiple outgoing response messages (e.g. HTTP2).

Packetdrill script for testing:
~~~~~~
+0 `sysctl -q -w net.ipv4.tcp_min_tso_segs=10`
+0 `sysctl -q -w net.ipv4.tcp_no_metrics_save=1`
+0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0

0.100 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
0.100 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 7>
0.200 < . 1:1(0) ack 1 win 257
0.200 accept(3, ..., ...) = 4
+0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0

0.200 write(4, ..., 14600) = 14600
0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730
0.200 sendto(4, ..., 730, MSG_EOR, ..., ...) = 730

0.200 > .  1:7301(7300) ack 1
0.200 > P. 7301:14601(7300) ack 1

0.300 < . 1:1(0) ack 14601 win 257
0.300 > P. 14601:15331(730) ack 1
0.300 > P. 15331:16061(730) ack 1

0.400 < . 1:1(0) ack 16061 win 257
0.400 close(4) = 0
0.400 > F. 16061:16061(0) ack 1
0.400 < F. 1:1(0) ack 16062 win 257
0.400 > . 16062:16062(0) ack 2
Signed-off-by: default avatarMartin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Soheil Hassas Yeganeh <soheil@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Suggested-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c134ecb8
    • David S. Miller's avatar
      Merge branch 'tcp-redundant-checks' · 2a9e8438
      David S. Miller authored 
      Soheil Hassas Yeganeh says:

====================
tcp: simplify ack tx timestamps

v2:
- Fully remove SKBTX_ACK_TSTAMP, as suggested by Willem de Bruijn.

This patch series aims at removing redundant checks and fields
for ack timestamps for TCP.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2a9e8438
    • Soheil Hassas Yeganeh's avatar
      tcp: remove SKBTX_ACK_TSTAMP since it is redundant · 0a2cf20c
      Soheil Hassas Yeganeh authored 
      The SKBTX_ACK_TSTAMP flag is set in skb_shinfo->tx_flags when
the timestamp of the TCP acknowledgement should be reported on
error queue. Since accessing skb_shinfo is likely to incur a
cache-line miss at the time of receiving the ack, the
txstamp_ack bit was added in tcp_skb_cb, which is set iff
the SKBTX_ACK_TSTAMP flag is set for an skb. This makes
SKBTX_ACK_TSTAMP flag redundant.

Remove the SKBTX_ACK_TSTAMP and instead use the txstamp_ack bit
everywhere.

Note that this frees one bit in shinfo->tx_flags.
Signed-off-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
Suggested-by: default avatarWillem de Bruijn <willemb@google.com>
Acked-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0a2cf20c
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