util: Set thread name via pthreads in set_subprogram_name().

This makes "top" and "ps" output more readable on FreeBSD at least, and
the names are also visible in debuggers.

Suggested-by: Ed Maste <emaste@freebsd.org>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>
Tested-by: Andy Zhou <azhou@nicira.com>
meta-flow: Be pickier about format of Ethernet addresses.

Otherwise, input with invalid trailing data was accepted, such as input
that had 7 colon-separated segments instead of 6.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>
ovs-thread: Add wrappers for "destroy" functions too.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
dpif-linux: Make port change notification thread-safe.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
dpif-linux: Make use of channels thread-safe.

This seems to be the last remaining thread-unsafe code in dpif-linux.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
dpif-netdev: Make internally thread-safe by introducing a global mutex.

This can be improved later but it is the simple thing to do for now.

I marked a couple of races with XXX.  I don't have a really good solution
for these, but I hope to find one.  They may be harmless in practice.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
dpif: Make dpifs thread-safe, and document it.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
.gitignore: ignore temporary _debian packaging content

Signed-off-by: Mark Hamilton <mhamilton@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath: Use correct type while allocating flex array.

Flex array is used to allocate hash buckets which is type struct
hlist_head, but we use `struct hlist_head *` to calculate
array size.  Since hlist_head is of size pointer it works fine.

Following patch use correct type.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
datapath: Use non rcu hlist_del() flow table entry.

Flow table destroy is done in rcu call-back context.  Therefore
there is no need to use rcu variant of hlist_del().

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@niciria.com>
ofp-util: Fix port and queue stat counting for OpenFlow 1.3.

OpenFlow 1.0, 1.1, and 1.2 all have the same struct size for port and
queue stats.  OpenFlow 1.3 has larger structs, but the ofp-util code didn't
realize that.  This fixes the problem.

It appears that the only consequence of this problem would have been
printing the wrong count in ofp-print output.

Signed-off-by: Ben Pfaff <blp@nicira.com>
Implement OpenFlow 1.3 queue stats duration feature.

Signed-off-by: Ben Pfaff <blp@nicira.com>
datapath: list: Fix double fetch of pointer in hlist_entry_safe()

Following patch backports commit f65846a1800ef8c48d (list: Fix double
fetch of pointer in hlist_entry_safe()) from upstream kernel.
This patch fixes following panic. Thanks to Jesse for helping to
debug this issue.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000118
[129608.216422] IP: [<ffffffffa02436da>] ovs_masked_flow_lookup+0xda/0x140 [openvswitch]
[129608.216918] PGD 11500a067 PUD 120851067 PMD 0
[129608.216994] Oops: 0000 [#1] SMP
[129608.217049] CPU 0
[129608.218697]
[129608.218726] Pid: 0, comm: swapper/0 Tainted: G           O
3.2.39-server-nn21 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop
Reference Platform
[129608.219288] RIP: 0010:[<ffffffffa02436da>]  [<ffffffffa02436da>]
ovs_masked_flow_lookup+0xda/0x140 [openvswitch]
[129608.219454] RSP: 0018:ffff88013fc03b60  EFLAGS: 00010282
[129608.219536] RAX: 0000000000000020 RBX: ffff880123087100 RCX:
ffff88012098e000
[129608.219719] RDX: ffff8800b3b0ca30 RSI: 000000000000010a RDI:
ffff88011df8c000
[129608.220121] RBP: ffff88013fc03c30 R08: 0000000000000001 R09:
0000000020069825
[129608.220287] R10: 0000000000000020 R11: 0000000000000001 R12:
ffff880036e1c6c0
[129608.220451] R13: ffff88013fc03b98 R14: 0000000000000024 R15:
ffffffffffffffe0
[129608.220618] FS:  0000000000000000(0000) GS:ffff88013fc00000(0000)
knlGS:0000000000000000
[129608.220794] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[129608.220911] CR2: 0000000000000118 CR3: 00000001190c9000 CR4:
00000000000406f0
[129608.221122] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[129608.221320] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[129608.221488] Process swapper/0 (pid: 0, threadinfo ffffffff81c00000,
task ffffffff81c0d020)
[129608.221669] Stack:
[129608.221725]  0000000000000044 0000000000000020 ffff88013fc03c60
0000000000000000
[129608.221906]  0000000000000000 0000000000000000 0000000000000000
f014232200000002
[129608.222069]  1973f0142322015a 0000000600080000 1973f0140579f414
000000002f1dc7ec
[129608.222211] Call Trace:
[129608.222264]  <IRQ>
[129608.222316]  [<ffffffffa02445bd>] ovs_flow_lookup+0x5d/0x70
[openvswitch]
[129608.222411]  [<ffffffffa0242550>] ovs_dp_process_received_packet+0x70/0x110 [openvswitch]
[129608.222541]  [<ffffffff8104d6ec>] ? resched_task+0x2c/0x80
[129608.222644]  [<ffffffffa0249b20>] ? netdev_create+0x120/0x120
[openvswitch]
[129608.222743]  [<ffffffffa02483f8>] ovs_vport_receive+0x38/0x40
[openvswitch]
[129608.222838]  [<ffffffffa0249bc3>] netdev_frame_hook+0xa3/0xf0
[openvswitch]
[129608.222933]  [<ffffffffa0249b20>] ? netdev_create+0x120/0x120
[openvswitch]
[129608.223029]  [<ffffffff81539318>] __netif_receive_skb+0x1c8/0x620
[129608.223114]  [<ffffffff81325740>] ? map_single+0x60/0x60
[129608.223192]  [<ffffffff81539b71>] process_backlog+0xb1/0x190
[129608.223274]  [<ffffffff8153ae64>] net_rx_action+0x134/0x290
[129608.223355]  [<ffffffff8106e1a8>] __do_softirq+0xa8/0x210
[129608.223433]  [<ffffffff816458de>] ? _raw_spin_lock+0xe/0x20
[129608.223513]  [<ffffffff8164fcac>] call_softirq+0x1c/0x30
[129608.223590]  [<ffffffff81016215>] do_softirq+0x65/0xa0
[129608.223665]  [<ffffffff8106e58e>] irq_exit+0x8e/0xb0
[129608.223738]  [<ffffffff81650573>] do_IRQ+0x63/0xe0
[129608.223808]  [<ffffffff81645d6e>] common_interrupt+0x6e/0x6e
[129608.223887]  <EOI>
[129608.223933]  [<ffffffff8103ced6>] ? native_safe_halt+0x6/0x10
[129608.224014]  [<ffffffff8101c6a3>] default_idle+0x53/0x1d0
[129608.224092]  [<ffffffff81013236>] cpu_idle+0xd6/0x120
[129608.224167]  [<ffffffff8161785e>] rest_init+0x72/0x74
[129608.224252]  [<ffffffff81cfcbaa>] start_kernel+0x3b5/0x3c2
[129608.224331]  [<ffffffff81cfc347>]
x86_64_start_reservations+0x132/0x136
[129608.224421]  [<ffffffff81cfc140>] ? early_idt_handlers+0x140/0x140
[129608.224506]  [<ffffffff81cfc44d>] x86_64_start_kernel+0x102/0x111
[129608.224589] Code: 25 48 63 53 28 48 8d 42 01 48 c1 e0 04 49 01 c7 49
8b 07 48 85 c0 74 61 4d 8b 3f 48 c1 e2 04 48 83 c2 10 49 29 d7 4d 85 ff
74 26 <4d> 39 a7 38 01 00 00 75 cd 48 8b 95 38 ff ff ff 4c 89 ee 49 8d
[129608.224949] RIP  [<ffffffffa02436da>] ovs_masked_flow_lookup+0xda/0x140 [openvswitch]

Original commit msg:

list: Fix double fetch of pointer in hlist_entry_safe()

The current version of hlist_entry_safe() fetches the pointer twice,
once to test for NULL and the other to compute the offset back to the
enclosing structure.  This is OK for normal lock-based use because in
that case, the pointer cannot change.  However, when the pointer is
protected by RCU (as in "rcu_dereference(p)"), then the pointer can
change at any time.  This use case can result in the following sequence
of events:

1.  CPU 0 invokes hlist_entry_safe(), fetches the RCU-protected
    pointer as sees that it is non-NULL.

2.  CPU 1 invokes hlist_del_rcu(), deleting the entry that CPU 0
    just fetched a pointer to.  Because this is the last entry
    in the list, the pointer fetched by CPU 0 is now NULL.

3.  CPU 0 refetches the pointer, obtains NULL, and then gets a
    NULL-pointer crash.

This commit therefore applies gcc's "({ })" statement expression to
create a temporary variable so that the specified pointer is fetched
only once, avoiding the above sequence of events.  Please note that
it is the caller's responsibility to use rcu_dereference() as needed.
This allows RCU-protected uses to work correctly without imposing
any additional overhead on the non-RCU case.

Many thanks to Eric Dumazet for spotting root cause!

Reported-by: CAI Qian <caiqian@redhat.com>
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Li Zefan <lizefan@huawei.com>

Bug #17099

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
datapath: fix a bug in SF_FLOW_KEY_PUT macro

This bug will cause mask values to corrupt the flow key value. So far
the bug has not showed up because we don't write mask value when
there is no mask Netlink attributes.  However, it needs to be fixed for
the next and future commits where we will start to set default
values for key and mask for missing Netlink attributes.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
ovs-dev.py: Rely on configure for warning options.

Both -Wall and -Wextra are handled by autoconf, so there's no longer a
need for ovs-dev.py to pass them through CFLAGS.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
ovs-dev.py: Add support for clang builds.

Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
datapath: Fix missing VLAN netlink attribute handling

Missing VLAN netlink attribute should be interpreted as exact match
of no VLAN tag, instead of wildcarded match for all VLAN tags.

Bug #18736.

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
ofproto-dpif: Correctly refresh all ports on ENOBUFS from dpif_port_poll().

dpif_port_poll() is allowed to return ENOBUFS if something might have
changed, but the specific change isn't easily reportable.  type_run()
didn't handle this case, so it wouldn't notice any changes when this
happened.

dpif-netdev (including dpif-dummy) uses ENOBUFS exclusively to report
changes, so this fixes a problem there.  dpif-linux rarely uses ENOBUFS but
it can do so if a kernel-to-user Netlink buffer overflows.

Signed-off-by: Ben Pfaff <blp@nicira.com>
ofproto-dpif: Tolerate spontaneous changes in datapath port numbers.

This can happen on ESX.

Also adds a test to make sure this works.

Bug #17634.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Tested-by: Guolin Yang <gyang@vmware.com>
Avoid C preprocessor trick where macro has the same name as a function.

In C, one can do preprocessor tricks by making a macro expansion include
the macro's own name.  We actually used this in the tree to automatically
provide function arguments, e.g.:

    int f(int x, const char *file, int line);
    #define f(x) f(x, __FILE__, __LINE__)

...

    f(1);    /* Expands to a call like f(1, __FILE__, __LINE__); */

However it's somewhat confusing, so this commit stops using that trick.

Reported-by: Ed Maste <emaste@freebsd.org>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ed Maste <emaste@freebsd.org>