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  1. 19 Aug, 2016 12 commits
    • Jiri Kosina's avatar
      net: sched: fix handling of singleton qdiscs with qdisc_hash · 69012ae4
      Jiri Kosina authored 
      qdisc_match_from_root() is now iterating over per-netdevice qdisc
hashtable instead of going through a linked-list of qdiscs (independently
on the actual underlying netdev), which was the case before the switch to
hashtable for qdiscs.

For singleton qdiscs, there is no underlying netdev associated though, and
therefore dumping a singleton qdisc will panic, as qdisc_dev(root) will
always be NULL.

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000410
 IP: [<ffffffff8167efac>] qdisc_match_from_root+0x2c/0x70
 PGD 1aceba067 PUD 1aceb7067 PMD 0
 Oops: 0000 [#1] PREEMPT SMP
[ ... ]
 task: ffff8801ec996e00 task.stack: ffff8801ec934000
 RIP: 0010:[<ffffffff8167efac>]  [<ffffffff8167efac>] qdisc_match_from_root+0x2c/0x70
 RSP: 0018:ffff8801ec937ab0  EFLAGS: 00010203
 RAX: 0000000000000408 RBX: ffff88025e612000 RCX: ffffffffffffffd8
 RDX: 0000000000000000 RSI: 00000000ffff0000 RDI: ffffffff81cf8100
 RBP: ffff8801ec937ab0 R08: 000000000001c160 R09: ffff8802668032c0
 R10: ffffffff81cf8100 R11: 0000000000000030 R12: 00000000ffff0000
 R13: ffff88025e612000 R14: ffffffff81cf3140 R15: 0000000000000000
 FS:  00007f24b9af6740(0000) GS:ffff88026f280000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000410 CR3: 00000001aceec000 CR4: 00000000001406e0
 Stack:
  ffff8801ec937ad0 ffffffff81681210 ffff88025dd51a00 00000000fffffff1
  ffff8801ec937b88 ffffffff81681e4e ffffffff81c42bc0 ffff880262431500
  ffffffff81cf3140 ffff88025dd51a10 ffff88025dd51a24 00000000ec937b38
 Call Trace:
  [<ffffffff81681210>] qdisc_lookup+0x40/0x50
  [<ffffffff81681e4e>] tc_modify_qdisc+0x21e/0x550
  [<ffffffff8166ae25>] rtnetlink_rcv_msg+0x95/0x220
  [<ffffffff81209602>] ? __kmalloc_track_caller+0x172/0x230
  [<ffffffff8166ad90>] ? rtnl_newlink+0x870/0x870
  [<ffffffff816897b7>] netlink_rcv_skb+0xa7/0xc0
  [<ffffffff816657c8>] rtnetlink_rcv+0x28/0x30
  [<ffffffff8168919b>] netlink_unicast+0x15b/0x210
  [<ffffffff81689569>] netlink_sendmsg+0x319/0x390
  [<ffffffff816379f8>] sock_sendmsg+0x38/0x50
  [<ffffffff81638296>] ___sys_sendmsg+0x256/0x260
  [<ffffffff811b1275>] ? __pagevec_lru_add_fn+0x135/0x280
  [<ffffffff811b1a90>] ? pagevec_lru_move_fn+0xd0/0xf0
  [<ffffffff811b1140>] ? trace_event_raw_event_mm_lru_insertion+0x180/0x180
  [<ffffffff811b1b85>] ? __lru_cache_add+0x75/0xb0
  [<ffffffff817708a6>] ? _raw_spin_unlock+0x16/0x40
  [<ffffffff811d8dff>] ? handle_mm_fault+0x39f/0x1160
  [<ffffffff81638b15>] __sys_sendmsg+0x45/0x80
  [<ffffffff81638b62>] SyS_sendmsg+0x12/0x20
  [<ffffffff810038e7>] do_syscall_64+0x57/0xb0

Fix this by special-casing singleton qdiscs (those that don't have
underlying netdevice) and introduce immediate handling of those rather
than trying to go over an underlying netdevice. We're in the same
situation in tc_dump_qdisc_root() and tc_dump_tclass_root().

Ultimately, this will have to be slightly reworked so that we are actually
able to show singleton qdiscs (noop) in the dump properly; but we're not
currently doing that anyway, so no regression there, and better do this in
a gradual manner.

Fixes: 59cc1f61 ("net: sched: convert qdisc linked list to hashtable")
Reported-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Tested-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Reported-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Tested-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      69012ae4
    • David S. Miller's avatar
      Merge branch 'tipc-next' · e951f145
      David S. Miller authored 
      Jon Maloy says:

====================
tipc: bearer and link improvements

The first commit makes it possible to set and check the 'blocked' state
of a bearer from the generic bearer layer. The second commit is a small
improvement to the link congestion mechanism.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e951f145
    • Jon Paul Maloy's avatar
      tipc: ensure that link congestion and wakeup use same criteria · 5a0950c2
      Jon Paul Maloy authored 
      When a link is attempted woken up after congestion, it uses a different,
more generous criteria than when it was originally declared congested.
This has the effect that the link, and the sending process, sometimes
will be woken up unnecessarily, just to immediately return to congestion
when it turns out there is not not enough space in its send queue to
host the pending message. This is a waste of CPU cycles.

We now change the function link_prepare_wakeup() to use exactly the same
criteria as tipc_link_xmit(). However, since we are now excluding the
window limit from the wakeup calculation, and the current backlog limit
for the lowest level is too small to house even a single maximum-size
message, we have to expand this limit. We do this by evaluating an
alternative, minimum value during the setting of the importance limits.
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5a0950c2
    • Jon Paul Maloy's avatar
      tipc: make bearer packet filtering generic · 0d051bf9
      Jon Paul Maloy authored 
      In commit 5b7066c3 ("tipc: stricter filtering of packets in bearer
layer") we introduced a method of filtering out messages while a bearer
is being reset, to avoid that links may be re-created and come back in
working state while we are still in the process of shutting them down.

This solution works well, but is limited to only work with L2 media, which
is insufficient with the increasing use of UDP as carrier media.

We now replace this solution with a more generic one, by introducing a
new flag "up" in the generic struct tipc_bearer. This field will be set
and reset at the same locations as with the previous solution, while
the packet filtering is moved to the generic code for the sending side.
On the receiving side, the filtering is still done in media specific
code, but now including the UDP bearer.
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0d051bf9
    • David S. Miller's avatar
      Merge branch 'qed-next' · 37bd91d1
      David S. Miller authored 
      Sudarsana Reddy Kalluru says:

====================
qed*: Add support for additional statistics.

The patch series adds qed/qede support for new statistics.
Patch (1) adds couple of statistcs for "ethtool -S" display.
Patch (2) adds support for per-queue statistics to ethtool display.
Patch (3) adds qed support for NCSI statistics.

Please consider applying this to 'net-next' branch.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      37bd91d1
    • Sudarsana Reddy Kalluru's avatar
      qed: Add support for NCSI statistics. · 6c754246
      Sudarsana Reddy Kalluru authored 
      The patch adds driver support for sending the NCSI statistics to the
MFW. This is an asynchronous request from MFW. Upon receiving this, driver
populates the required data and send it to MFW.
Signed-off-by: default avatarSudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6c754246
    • Sudarsana Reddy Kalluru's avatar
      qede: Add support for per-queue stats. · 68db9ec2
      Sudarsana Reddy Kalluru authored 
      Signed-off-by: default avatarSudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      68db9ec2
    • Sudarsana Reddy Kalluru's avatar
      qede: Add support for capturing additional stats in ethtool-stats display. · 1a5a366f
      Sudarsana Reddy Kalluru authored 
      The patch adds driver support for capturing stats ttl0_discard and
packet_too_big_discard in "ethtool -S" display.
Signed-off-by: default avatarSudarsana Reddy Kalluru <sudarsana.kalluru@qlogic.com>
Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1a5a366f
    • Colin Ian King's avatar
      net: atm: remove redundant null pointer check on dev->name · 0d135e4f
      Colin Ian King authored 
      dev->name is a char array of IFNAMSIZ elements, hence can never be
null, so the null pointer check is redundant. Remove it.
Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0d135e4f
    • Appana Durga Kedareswara Rao's avatar
      net: phy: Update copyright info · e202d4c6
      Appana Durga Kedareswara Rao authored 
      For implementing this driver most of the inputs is
provided by Andrew Lunn.

Updating the driver with Andrew Copy right.
Signed-off-by: default avatarKedareswara rao Appana <appanad@xilinx.com>
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e202d4c6
    • shubhrajyoti.datta@xilinx.com's avatar
      net: ethernet: macb: Add support for rx_clk · aead88bd
      shubhrajyoti.datta@xilinx.com authored 
      Some of the platforms like zynqmp ultrascale+ has a
separate clock gate for the rx clock. Add an optional
rx_clk so that the clock can be enabled.
Signed-off-by: default avatarShubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aead88bd
    • David S. Miller's avatar
      Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue · d52bfbda
      David S. Miller authored 
      Jeff Kirsher says:

====================
40GbE Intel Wired LAN Driver Updates 2016-08-18

This series contains updates to i40e and i40evf only.

Wei Yongjun updates i40e to use list_move() instead of list_del() &
list_add() operations.

Anjali fixes an issue where the client->open call was not protected with
the client instance mutex, which allowed client->close to be called before
the open all completed.

Catherine makes sure that the VLAN count (and stats) gets reset to 0
after reset.

Jake provides two patches, first adds the needed rtnl lock around
i40evf_set_interrupt_capability() since i40evf_init_task() does not
hold the rtnl_lock.  Second fixes an issue where users could reduce
the number of channels (queues) below the current flow director
filter rules targets.

Dave fixes a problem where a static analysis tool generates a warning
so eliminating the irrelevant check and redundant assignment for the
value of enabled_tc.

Avinash fixes an sync issue where the iWARP device open is called
before the PCI register writes are completed, so ensure the register
writes complete before exiting the setup function.

Alan fixes a bug which causes RSS to continue to work after being
disabled.

Carolyn implements a feature change which allows using ethtool to set
RDD hash options using less than four parameters if desired.

Dan Carpenter cleans up a stray unlock.

Sridhar exposes the "trust" flag to userspace via ndo_get_vf_config().
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d52bfbda
  3. 18 Aug, 2016 17 commits
  5. 17 Aug, 2016 11 commits
    • David S. Miller's avatar
      Merge branch 'strparser' · 48433419
      David S. Miller authored 
      Tom Herbert says:

====================
strp: Stream parser for messages

This patch set introduces a utility for parsing application layer
protocol messages in a TCP stream. This is a generalization of the
mechanism implemented of Kernel Connection Multiplexor.

This patch set adapts KCM to use the strparser. We expect that kTLS
can use this mechanism also. RDS would probably be another candidate
to use a common stream parsing mechanism.

The API includes a context structure, a set of callbacks, utility
functions, and a data ready function. The callbacks include
a parse_msg function that is called to perform parsing (e.g.
BPF parsing in case of KCM), and a rcv_msg function that is called
when a full message has been completed.

For strparser we specify the return codes from the parser to allow
the backend to indicate that control of the socket should be
transferred back to userspace to handle some exceptions in the
stream: The return values are:

      >0 : indicates length of successfully parsed message
       0  : indicates more data must be received to parse the message
       -ESTRPIPE : current message should not be processed by the
          kernel, return control of the socket to userspace which
          can proceed to read the messages itself
       other < 0 : Error is parsing, give control back to userspace
          assuming that synchronization is lost and the stream
          is unrecoverable (application expected to close TCP socket)

There is one issue I haven't been able to fully resolve. If parse_msg
returns ESTRPIPE (wants control back to userspace) the parser may
already have consumed some bytes of the message. There is no way to
put bytes back into the TCP receive queue and tcp_read_sock does not
allow an easy way to peek messages. In lieu of a better solution, we
return ENODATA on the socket to indicate that the data stream is
unrecoverable (application needs to close socket). This condition
should only happen if an application layer message header is split
across two skbuffs and parsing just the first skbuff wasn't sufficient
to determine the that transfer to userspace is needed.

This patch set contains:

  - strparser implementation
  - changes to kcm to use strparser
  - strparser.txt documentation

v2:
  - Add copyright notice to C files
  - Remove GPL module license from strparser.c
  - Add report of rxpause

v3:
  - Restore GPL module license
  - Use EXPORT_SYMBOL_GPL

v4:
  - Removed unused function, changed another to be static as suggested
    by davem
  - Rewoked data_ready to be called from upper layer, no longer requires
    taking over socket data_ready callback as suggested by Lance Chao

Tested:
  - Ran a KCM thrash test for 24 hours. No behavioral or performance
    differences observed.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      48433419
    • Tom Herbert's avatar
      strparser: Documentation · adcce4d5
      Tom Herbert authored 
      Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      adcce4d5
    • Tom Herbert's avatar
      kcm: Use stream parser · 9b73896a
      Tom Herbert authored 
      Adapt KCM to use the stream parser. This mostly involves removing
the RX handling and setting up the strparser using the interface.
Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9b73896a
    • Tom Herbert's avatar
      strparser: Stream parser for messages · 43a0c675
      Tom Herbert authored 
      This patch introduces a utility for parsing application layer protocol
messages in a TCP stream. This is a generalization of the mechanism
implemented of Kernel Connection Multiplexor.

The API includes a context structure, a set of callbacks, utility
functions, and a data ready function.

A stream parser instance is defined by a strparse structure that
is bound to a TCP socket. The function to initialize the structure
is:

int strp_init(struct strparser *strp, struct sock *csk,
              struct strp_callbacks *cb);

csk is the TCP socket being bound to and cb are the parser callbacks.

The upper layer calls strp_tcp_data_ready when data is ready on the lower
socket for strparser to process. This should be called from a data_ready
callback that is set on the socket:

void strp_tcp_data_ready(struct strparser *strp);

A parser is bound to a TCP socket by setting data_ready function to
strp_tcp_data_ready so that all receive indications on the socket
go through the parser. This is assumes that sk_user_data is set to
the strparser structure.

There are four callbacks.
 - parse_msg is called to parse the message (returns length or error).
 - rcv_msg is called when a complete message has been received
 - read_sock_done is called when data_ready function exits
 - abort_parser is called to abort the parser

The input to parse_msg is an skbuff which contains next message under
construction. The backend processing of parse_msg will parse the
application layer protocol headers to determine the length of
the message in the stream. The possible return values are:

   >0 : indicates length of successfully parsed message
   0  : indicates more data must be received to parse the message
   -ESTRPIPE : current message should not be processed by the
      kernel, return control of the socket to userspace which
      can proceed to read the messages itself
   other < 0 : Error is parsing, give control back to userspace
      assuming that synchronzation is lost and the stream
      is unrecoverable (application expected to close TCP socket)

In the case of error return (< 0) strparse will stop the parser
and report and error to userspace. The application must deal
with the error. To handle the error the strparser is unbound
from the TCP socket. If the error indicates that the stream
TCP socket is at recoverable point (ESTRPIPE) then the application
can read the TCP socket to process the stream. Once the application
has dealt with the exceptions in the stream, it may again bind the
socket to a strparser to continue data operations.

Note that ENODATA may be returned to the application. In this case
parse_msg returned -ESTRPIPE, however strparser was unable to maintain
synchronization of the stream (i.e. some of the message in question
was already read by the parser).

strp_pause and strp_unpause are used to provide flow control. For
instance, if rcv_msg is called but the upper layer can't immediately
consume the message it can hold the message and pause strparser.
Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      43a0c675
    • Thierry Reding's avatar
      net: ipconfig: Fix more use after free · d2d371ae
      Thierry Reding authored 
      While commit 9c706a49 ("net: ipconfig: fix use after free") avoids
the use after free, the resulting code still ends up calling both the
ic_setup_if() and ic_setup_routes() after calling ic_close_devs(), and
access to the device is still required.

Move the call to ic_close_devs() to the very end of the function.
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d2d371ae
    • David S. Miller's avatar
      Merge branch 'tc_action-fixes' · b96c22c0
      David S. Miller authored 
      Cong Wang says:

====================
net_sched: tc action fixes and updates

This patchset fixes a few regressions caused by the previous
code refactor and more. Thanks to Jamal for catching them!

Note, patch 3/7 and 4/7 are not strictly necessary for this patchset,
I just want to carry them together.

---
v4: adjust an indention for Jamal
    add two more patches

v3: avoid list for fast path, suggested by Jamal

v2: replace flex_array with regular dynamic array
    keep tcf_action_stats_update() in act_api.h
    fix macro typos found by Amir
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b96c22c0
    • Roman Mashak's avatar
      net_sched: allow flushing tc police actions · b5ac8518
      Roman Mashak authored 
      The act_police uses its own code to walk the
action hashtable, which leads to that we could
not flush standalone tc police actions, so just
switch to tcf_generic_walker() like other actions.

(Joint work from Roman and Cong.)
Signed-off-by: default avatarRoman Mashak <mrv@mojatatu.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b5ac8518
    • WANG Cong's avatar
      net_sched: unify the init logic for act_police · 0852e455
      WANG Cong authored 
      Jamal reported a crash when we create a police action
with a specific index, this is because the init logic
is not correct, we should always create one for this
case. Just unify the logic with other tc actions.

Fixes: a03e6fe5 ("act_police: fix a crash during removal")
Reported-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0852e455
    • WANG Cong's avatar
      net_sched: convert tcf_exts from list to pointer array · 22dc13c8
      WANG Cong authored 
      As pointed out by Jamal, an action could be shared by
multiple filters, so we can't use list to chain them
any more after we get rid of the original tc_action.
Instead, we could just save pointers to these actions
in tcf_exts, since they are refcount'ed, so convert
the list to an array of pointers.

The "ugly" part is the action API still accepts list
as a parameter, I just introduce a helper function to
convert the array of pointers to a list, instead of
relying on the C99 feature to iterate the array.

Fixes: a85a970a ("net_sched: move tc_action into tcf_common")
Reported-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      22dc13c8
    • WANG Cong's avatar
      net_sched: move tc offload macros to pkt_cls.h · 2734437e
      WANG Cong authored 
      struct tcf_exts belongs to filters, should not be visible
to plain tc actions.

Cc: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2734437e
    • WANG Cong's avatar
      net_sched: fix a typo in tc_for_each_action() · 0c23c3e7
      WANG Cong authored 
      It is harmless because all users pass 'a' to this macro.

Fixes: 00175aec ("net/sched: Macro instead of CONFIG_NET_CLS_ACT ifdef")
Cc: Amir Vadai <amir@vadai.me>
Signed-off-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Acked-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0c23c3e7
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