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  1. 27 1月, 2012 2 次提交
  3. 25 1月, 2012 3 次提交
  5. 23 1月, 2012 2 次提交
    • S
      tcp: md5: using remote adress for md5 lookup in rst packet · 8a622e71
      由 shawnlu 提交于 
      md5 key is added in socket through remote address.
remote address should be used in finding md5 key when
sending out reset packet.
Signed-off-by: Nshawnlu <shawn.lu@ericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      8a622e71
    • Y
      tcp: detect loss above high_seq in recovery · 974c1236
      由 Yuchung Cheng 提交于 
      Correctly implement a loss detection heuristic: New sequences (above
high_seq) sent during the fast recovery are deemed lost when higher
sequences are SACKed.

Current code does not catch these losses, because tcp_mark_head_lost()
does not check packets beyond high_seq. The fix is straight-forward by
checking packets until the highest sacked packet. In addition, all the
FLAG_DATA_LOST logic are in-effective and redundant and can be removed.

Update the loss heuristic comments. The algorithm above is documented
as heuristic B, but it is redundant too because heuristic A already
covers B.

Note that this change only marks some forward-retransmitted packets LOST.
It does NOT forbid TCP performing further CWR on new losses. A potential
follow-up patch under preparation is to perform another CWR on "new"
losses such as
1) sequence above high_seq is lost (by resetting high_seq to snd_nxt)
2) retransmission is lost.
Signed-off-by: NYuchung Cheng <ycheng@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      974c1236
  7. 21 1月, 2012 2 次提交
    • N
      tcp: fix undo after RTO for CUBIC · 5a45f008
      由 Neal Cardwell 提交于 
      This patch fixes CUBIC so that cwnd reductions made during RTOs can be
undone (just as they already can be undone when using the default/Reno
behavior).

When undoing cwnd reductions, BIC-derived congestion control modules
were restoring the cwnd from last_max_cwnd. There were two problems
with using last_max_cwnd to restore a cwnd during undo:

(a) last_max_cwnd was set to 0 on state transitions into TCP_CA_Loss
(by calling the module's reset() functions), so cwnd reductions from
RTOs could not be undone.

(b) when fast_covergence is enabled (which it is by default)
last_max_cwnd does not actually hold the value of snd_cwnd before the
loss; instead, it holds a scaled-down version of snd_cwnd.

This patch makes the following changes:

(1) upon undo, revert snd_cwnd to ca->loss_cwnd, which is already, as
the existing comment notes, the "congestion window at last loss"

(2) stop forgetting ca->loss_cwnd on TCP_CA_Loss events

(3) use ca->last_max_cwnd to check if we're in slow start
Signed-off-by: NNeal Cardwell <ncardwell@google.com>
Acked-by: NStephen Hemminger <shemminger@vyatta.com>
Acked-by: NSangtae Ha <sangtae.ha@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5a45f008
    • N
      tcp: fix undo after RTO for BIC · fc16dcd8
      由 Neal Cardwell 提交于 
      This patch fixes BIC so that cwnd reductions made during RTOs can be
undone (just as they already can be undone when using the default/Reno
behavior).

When undoing cwnd reductions, BIC-derived congestion control modules
were restoring the cwnd from last_max_cwnd. There were two problems
with using last_max_cwnd to restore a cwnd during undo:

(a) last_max_cwnd was set to 0 on state transitions into TCP_CA_Loss
(by calling the module's reset() functions), so cwnd reductions from
RTOs could not be undone.

(b) when fast_covergence is enabled (which it is by default)
last_max_cwnd does not actually hold the value of snd_cwnd before the
loss; instead, it holds a scaled-down version of snd_cwnd.

This patch makes the following changes:

(1) upon undo, revert snd_cwnd to ca->loss_cwnd, which is already, as
the existing comment notes, the "congestion window at last loss"

(2) stop forgetting ca->loss_cwnd on TCP_CA_Loss events

(3) use ca->last_max_cwnd to check if we're in slow start
Signed-off-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      fc16dcd8
  9. 18 1月, 2012 1 次提交
  11. 17 1月, 2012 2 次提交
  13. 13 1月, 2012 2 次提交
  15. 12 1月, 2012 2 次提交
  17. 10 1月, 2012 1 次提交
  19. 08 1月, 2012 1 次提交
  21. 06 1月, 2012 1 次提交
  23. 31 12月, 2011 1 次提交
  25. 29 12月, 2011 1 次提交
  27. 28 12月, 2011 2 次提交
  29. 23 12月, 2011 9 次提交
  31. 22 12月, 2011 1 次提交
  33. 21 12月, 2011 2 次提交
  35. 20 12月, 2011 2 次提交
  37. 17 12月, 2011 2 次提交
  39. 16 12月, 2011 1 次提交