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  1. 17 5月, 2011 1 次提交
  3. 12 5月, 2011 1 次提交
    • B
      sfc: Always map MCDI shared memory as uncacheable · 747df225
      由 Ben Hutchings 提交于 
      We enabled write-combining for memory-mapped registers in commit
65f0b417, but inhibited it for the
MCDI shared memory where this is not supported.  However,
write-combining mappings also allow read-reordering, which may also
be a problem.

I found that when an SFC9000-family controller is connected to an
Intel 3000 chipset, and write-combining is enabled, the controller
stops responding to PCIe read requests during driver initialisation
while the driver is polling for completion of an MCDI command.  This
results in an NMI and system hang.  Adding read memory barriers
between all reads to the shared memory area appears to reduce but not
eliminate the probability of this.

We have not yet established whether this is a bug in our BIU or in the
PCIe bridge.  For now, work around by mapping the shared memory area
separately.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      747df225
  5. 13 4月, 2011 1 次提交
    • N
      sfc: Use rmb() to ensure reads occur in order · fcfa0604
      由 Neil Turton 提交于 
      Enabling write-combining may also enable read reordering.  The BIU is
only guaranteed to read from a 128-bit CSR or 64-bit SRAM word when
the host reads from its lowest address; otherwise the BIU may use the
latched value.  Therefore we need to reinstate the read memory
barriers after the first read operation for each CSR or SRAM word.

Signed-off-by; Ben Hutchings <bhutchings@solarflare.com>
      fcfa0604
  7. 12 4月, 2011 2 次提交
    • B
      sfc: Do not use efx_process_channel_now() in online self-test · d4fabcc8
      由 Ben Hutchings 提交于 
      During self-tests we use efx_process_channel_now() to handle
completion and other events synchronously.  This disables interrupts
and NAPI processing for the channel in question, but it may still be
interrupted by another channel.  A single socket may receive packets
from multiple net devices or even multiple channels of the same net
device, so this can result in deadlock on a socket lock.

Receiving packets in process context will also result in incorrect
classification by the network cgroup classifier.

Therefore, we must only use efx_process_channel_now() in the offline
loopback tests (which never deliver packets up the stack) and not for
the online interrupt and event tests.

For the interrupt test, there is no reason to process events.  We
only care that an interrupt is raised.

For the event test, we want to know whether events have been received,
and there may be many events ahead of the one we inject.  Therefore
remove efx_channel::magic_count and instead test whether
efx_channel::eventq_read_ptr advances.  This is currently an event
queue index and might wrap around to exactly the same value, resulting
in a false negative.  Therefore move the masking to efx_event() and
efx_nic_eventq_read_ack() so that it cannot wrap within the time of
the test.

The event test also tries to diagnose failures by checking whether an
event was delivered without causing an interrupt.  Add and use a
helper function that only does this.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      d4fabcc8
    • N
      sfc: Stop the TX queues during loopback self-tests · 9d1aea62
      由 Neil Turton 提交于 
      If the TX queues are running during loopback self tests, host
traffic gets looped back which causes the test to fail.  Avoid
restarting the TX queues after the port reset so that any packets
sent by the host get held back until after the tests have completed.

[bwh: Also wake all TX queues at the end of self-tests.]
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      9d1aea62
  9. 31 3月, 2011 1 次提交
  11. 23 3月, 2011 1 次提交
  13. 05 3月, 2011 1 次提交
    • B
      sfc: Use write-combining to reduce TX latency · 65f0b417
      由 Ben Hutchings 提交于 
      Based on work by Neil Turton <nturton@solarflare.com> and
Kieran Mansley <kmansley@solarflare.com>.

The BIU has now been verified to handle 3- and 4-dword writes within a
single 128-bit register correctly.  This means we can enable write-
combining and only insert write barriers between writes to distinct
registers.

This has been observed to save about 0.5 us when pushing a TX
descriptor to an empty TX queue.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      65f0b417
  15. 01 3月, 2011 8 次提交
  17. 23 2月, 2011 1 次提交
  19. 18 2月, 2011 1 次提交
    • B
      sfc: Implement hardware acceleration of RFS · 64d8ad6d
      由 Ben Hutchings 提交于 
      Use the existing filter management functions to insert TCP/IPv4 and
UDP/IPv4 4-tuple filters for Receive Flow Steering.

For each channel, track how many RFS filters are being added during
processing of received packets and scan the corresponding number of
table entries for filters that may be reclaimed.  Do this in batches
to reduce lock overhead.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      64d8ad6d
  21. 17 2月, 2011 1 次提交
  23. 16 2月, 2011 3 次提交
    • B
      sfc: Add TX queues for high-priority traffic · 94b274bf
      由 Ben Hutchings 提交于 
      Implement the ndo_setup_tc() operation with 2 traffic classes.

Current Solarstorm controllers do not implement TX queue priority, but
they do allow queues to be 'paced' with an enforced delay between
packets.  Paced and unpaced queues are scheduled in round-robin within
two separate hardware bins (paced queues with a large delay may be
placed into a third bin temporarily, but we won't use that).  If there
are queues in both bins, the TX scheduler will alternate between them.

If we make high-priority queues unpaced and best-effort queues paced,
and high-priority queues are mostly empty, a single high-priority queue
can then instantly take 50% of the packet rate regardless of how many
of the best-effort queues have descriptors outstanding.

We do not actually want an enforced delay between packets on best-
effort queues, so we set the pace value to a reserved value that
actually results in a delay of 0.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      94b274bf
    • B
      sfc: Distinguish queue lookup from test for queue existence · 525da907
      由 Ben Hutchings 提交于 
      efx_channel_get_{rx,tx}_queue() currently return NULL if the channel
isn't used for traffic in that direction.  In most cases this is a
bug, but some callers rely on it as an existence test.

Add existence test functions efx_channel_has_{rx_queue,tx_queues}()
and use them as appropriate.

Change efx_channel_get_{rx,tx}_queue() to assert that the requested
queue exists.

Remove now-redundant initialisation from efx_set_channels().
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      525da907
    • B
      sfc: Move TX queue core queue mapping into tx.c · 60031fcc
      由 Ben Hutchings 提交于 
      efx_hard_start_xmit() needs to implement a mapping which is the
inverse of tx_queue::core_txq.  Move the initialisation of
tx_queue::core_txq next to efx_hard_start_xmit() to make the
connection more obvious.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      60031fcc
  25. 25 1月, 2011 1 次提交
  27. 14 1月, 2011 2 次提交
  29. 24 12月, 2010 1 次提交
  31. 11 12月, 2010 4 次提交
  33. 08 12月, 2010 5 次提交
  35. 07 12月, 2010 5 次提交