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  1. 21 5月, 2005 17 次提交
  3. 20 5月, 2005 17 次提交
  5. 19 5月, 2005 6 次提交
    • L
      [PATCH] prevent NULL mmap in topdown model · 49a43876
      由 Linus Torvalds 提交于 
      Prevent the topdown allocator from allocating mmap areas all the way
down to address zero.

We still allow a MAP_FIXED mapping of page 0 (needed for various things,
ranging from Wine and DOSEMU to people who want to allow speculative
loads off a NULL pointer).

Tested by Chris Wright.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      49a43876
    • H
      [IPV4/IPV6] Ensure all frag_list members have NULL sk · 2fdba6b0
      由 Herbert Xu 提交于 
      Having frag_list members which holds wmem of an sk leads to nightmares
with partially cloned frag skb's.  The reason is that once you unleash
a skb with a frag_list that has individual sk ownerships into the stack
you can never undo those ownerships safely as they may have been cloned
by things like netfilter.  Since we have to undo them in order to make
skb_linearize happy this approach leads to a dead-end.

So let's go the other way and make this an invariant:

	For any skb on a frag_list, skb->sk must be NULL.

That is, the socket ownership always belongs to the head skb.
It turns out that the implementation is actually pretty simple.

The above invariant is actually violated in the following patch
for a short duration inside ip_fragment.  This is OK because the
offending frag_list member is either destroyed at the end of the
slow path without being sent anywhere, or it is detached from
the frag_list before being sent.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2fdba6b0
    • E
      [XFRM]: skb_cow_data() does not set proper owner for new skbs. · d4810200
      由 Evgeniy Polyakov 提交于 
      It looks like skb_cow_data() does not set 
proper owner for newly created skb.

If we have several fragments for skb and some of them
are shared(?) or cloned (like in async IPsec) there 
might be a situation when we require recreating skb and 
thus using skb_copy() for it.
Newly created skb has neither a destructor nor a socket
assotiated with it, which must be copied from the old skb.
As far as I can see, current code sets destructor and socket
for the first one skb only and uses truesize of the first skb
only to increment sk_wmem_alloc value.

If above "analysis" is correct then attached patch fixes that.
Signed-off-by: NEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Acked-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      d4810200
    • D
      [TG3]: In tg3_poll(), resample status_tag after doing work. · f7383c22
      由 David S. Miller 提交于 
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      f7383c22
    • D
      [TG3]: Refine DMA boundary setting. · 59e6b434
      由 David S. Miller 提交于 
      Extract DMA boundary bit selection into a seperate
function, tg3_calc_dma_bndry().  Call this from
tg3_test_dma().

Make DMA test more reliable by using no DMA boundry
setting during the test.  If the test passes, then
use the setting we selected before the test.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NMichael Chan <mchan@broadcom.com>
      59e6b434
    • D
      [TG3]: Set minimal hw interrupt mitigation. · 15f9850d
      由 David S. Miller 提交于 
      Even though we do software interrupt mitigation
via NAPI, it still helps to have some minimal
hw assisted mitigation.

This helps, particularly, on systems where register
I/O overhead is much greater than the CPU horsepower.

For example, it helps on NUMA systems.  In such cases
the PIO overhead to disable interrupts for NAPI accounts
for the majority of the packet processing cost.  The
CPU is fast enough such that only a single packet is
processed by each NAPI poll call.

Thanks to Michael Chan for reviewing this patch.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      15f9850d