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  1. 08 10月, 2008 6 次提交
  3. 23 7月, 2008 1 次提交
  5. 18 7月, 2008 8 次提交
  7. 06 7月, 2008 3 次提交
  9. 17 6月, 2008 1 次提交
    • P
      netns: introduce the net_hash_mix "salt" for hashes · 0b441916
      由 Pavel Emelyanov 提交于 
      There are many possible ways to add this "salt", thus I made this
patch to be the last in the series to change it if required.

Currently I propose to use the struct net pointer itself as this 
salt, but since this pointer is most often cache-line aligned, shift 
this right to eliminate the bits, that are most often zeroed.

After this, simply add this mix to prepared hashfn-s.

For CONFIG_NET_NS=n case this salt is 0 and no changes in hashfn
appear.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      0b441916
  11. 10 6月, 2008 2 次提交
  13. 15 4月, 2008 1 次提交
    • P
      [NETNS]: The generic per-net pointers. · dec827d1
      由 Pavel Emelyanov 提交于 
      Add the elastic array of void * pointer to the struct net.
The access rules are simple:

 1. register the ops with register_pernet_gen_device to get
    the id of your private pointer
 2. call net_assign_generic() to put the private data on the
    struct net (most preferably this should be done in the
    ->init callback of the ops registered)
 3. do not store any private reference on the net_generic array;
 4. do not change this pointer while the net is alive;
 5. use the net_generic() to get the pointer.

When adding a new pointer, I copy the old array, replace it
with a new one and schedule the old for kfree after an RCU
grace period.

Since the net_generic explores the net->gen array inside rcu
read section and once set the net->gen->ptr[x] pointer never 
changes, this grants us a safe access to generic pointers.

Quoting Paul: "... RCU is protecting -only- the net_generic 
structure that net_generic() is traversing, and the [pointer]
returned by net_generic() is protected by a reference counter 
in the upper-level struct net."
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      dec827d1
  15. 14 4月, 2008 3 次提交
  17. 04 4月, 2008 1 次提交
  19. 01 4月, 2008 2 次提交
  21. 26 3月, 2008 2 次提交
  23. 08 3月, 2008 3 次提交
  25. 05 3月, 2008 3 次提交
  27. 04 3月, 2008 4 次提交