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  1. 08 Dec, 2018 8 commits
    • Willem de Bruijn's avatar
      ip: silence udp zerocopy smatch false positive · 97ef7b4c
      Willem de Bruijn authored 
      extra_uref is used in __ip(6)_append_data only if uarg is set.

Smatch sees that the variable is passed to sock_zerocopy_put_abort.
This function accesses it only when uarg is set, but smatch cannot
infer this.

Make this dependency explicit.

Fixes: 52900d22 ("udp: elide zerocopy operation in hot path")
Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      97ef7b4c
    • David S. Miller's avatar
      Merge branch 'tc-testing-next' · 83af01ba
      David S. Miller authored 
      Lucas Bates says:

====================
tc-testing: implement command timeouts and better results tracking

Patch 1 adds a timeout feature for any command tdc launches in a subshell.
This prevents tdc from hanging indefinitely.

Patches 2-4 introduce a new method for tracking and generating test case
results, and implements it across the core script and all applicable
plugins.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83af01ba
    • Lucas Bates's avatar
      tc-testing: gitignore, ignore generated test results · 8d189159
      Lucas Bates authored 
      Ignore any .tap or .xml test result files generated by tdc.

Additionally, ignore plugin symlinks.
Signed-off-by: default avatarLucas Bates <lucasb@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d189159
    • Lucas Bates's avatar
      tc-testing: Implement the TdcResults module in tdc · 915c158d
      Lucas Bates authored 
      In tdc and the valgrind plugin, begin using the TdcResults module
to track executed test cases.
Signed-off-by: default avatarLucas Bates <lucasb@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      915c158d
    • Lucas Bates's avatar
      tc-testing: Add new TdcResults module · dfe465d3
      Lucas Bates authored 
      This module includes new classes for tdc to use in keeping track
of test case results, instead of generating and tracking a lengthy
string.

The new module can be extended to support multiple formal
test result formats to be friendlier to automation.
Signed-off-by: default avatarLucas Bates <lucasb@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      dfe465d3
    • Lucas Bates's avatar
      tc-testing: Add command timeout feature to tdc · d37e56df
      Lucas Bates authored 
      Using an attribute set in the tdc_config.py file, limit the
amount of time tdc will wait for an executed command to
complete and prevent the script from hanging entirely.

This timeout will be applied to all executed commands.
Signed-off-by: default avatarLucas Bates <lucasb@mojatatu.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d37e56df
    • yupeng's avatar
      net: call sk_dst_reset when set SO_DONTROUTE · 0fbe82e6
      yupeng authored 
      after set SO_DONTROUTE to 1, the IP layer should not route packets if
the dest IP address is not in link scope. But if the socket has cached
the dst_entry, such packets would be routed until the sk_dst_cache
expires. So we should clean the sk_dst_cache when a user set
SO_DONTROUTE option. Below are server/client python scripts which
could reprodue this issue:

server side code:

==========================================================================
import socket
import struct
import time

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('0.0.0.0', 9000))
s.listen(1)
sock, addr = s.accept()
sock.setsockopt(socket.SOL_SOCKET, socket.SO_DONTROUTE, struct.pack('i', 1))
while True:
    sock.send(b'foo')
    time.sleep(1)
==========================================================================

client side code:
==========================================================================
import socket
import time

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(('server_address', 9000))
while True:
    data = s.recv(1024)
    print(data)
==========================================================================
Signed-off-by: default avataryupeng <yupeng0921@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0fbe82e6
    • David Ahern's avatar
      neighbor: Improve garbage collection · 58956317
      David Ahern authored 
      The existing garbage collection algorithm has a number of problems:

1. The gc algorithm will not evict PERMANENT entries as those entries
   are managed by userspace, yet the existing algorithm walks the entire
   hash table which means it always considers PERMANENT entries when
   looking for entries to evict. In some use cases (e.g., EVPN) there
   can be tens of thousands of PERMANENT entries leading to wasted
   CPU cycles when gc kicks in. As an example, with 32k permanent
   entries, neigh_alloc has been observed taking more than 4 msec per
   invocation.

2. Currently, when the number of neighbor entries hits gc_thresh2 and
   the last flush for the table was more than 5 seconds ago gc kicks in
   walks the entire hash table evicting *all* entries not in PERMANENT
   or REACHABLE state and not marked as externally learned. There is no
   discriminator on when the neigh entry was created or if it just moved
   from REACHABLE to another NUD_VALID state (e.g., NUD_STALE).

   It is possible for entries to be created or for established neighbor
   entries to be moved to STALE (e.g., an external node sends an ARP
   request) right before the 5 second window lapses:

        -----|---------x|----------|-----
            t-5         t         t+5

   If that happens those entries are evicted during gc causing unnecessary
   thrashing on neighbor entries and userspace caches trying to track them.

   Further, this contradicts the description of gc_thresh2 which says
   "Entries older than 5 seconds will be cleared".

   One workaround is to make gc_thresh2 == gc_thresh3 but that negates the
   whole point of having separate thresholds.

3. Clearing *all* neigh non-PERMANENT/REACHABLE/externally learned entries
   when gc_thresh2 is exceeded is over kill and contributes to trashing
   especially during startup.

This patch addresses these problems as follows:

1. Use of a separate list_head to track entries that can be garbage
   collected along with a separate counter. PERMANENT entries are not
   added to this list.

   The gc_thresh parameters are only compared to the new counter, not the
   total entries in the table. The forced_gc function is updated to only
   walk this new gc_list looking for entries to evict.

2. Entries are added to the list head at the tail and removed from the
   front.

3. Entries are only evicted if they were last updated more than 5 seconds
   ago, adhering to the original intent of gc_thresh2.

4. Forced gc is stopped once the number of gc_entries drops below
   gc_thresh2.

5. Since gc checks do not apply to PERMANENT entries, gc levels are skipped
   when allocating a new neighbor for a PERMANENT entry. By extension this
   means there are no explicit limits on the number of PERMANENT entries
   that can be created, but this is no different than FIB entries or FDB
   entries.
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      58956317
  3. 07 Dec, 2018 32 commits
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