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  1. 12 4月, 2011 1 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
  3. 31 3月, 2011 1 次提交
  5. 01 3月, 2011 4 次提交
  7. 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
  9. 16 2月, 2011 2 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
  11. 25 1月, 2011 1 次提交
  13. 14 1月, 2011 1 次提交
  15. 11 12月, 2010 2 次提交
    • B
      sfc: Remove ancient support for nesting of TX stop · c04bfc6b
      由 Ben Hutchings 提交于 
      Long before this driver went into mainline, it had support for
multiple TX queues per port, with lockless TX enabled.  Since Linux
did not know anything of this, filling up any hardware TX queue would
stop the core TX queue and multiple hardware TX queues could fill up
before the scheduler reacted.  Thus it was necessary to keep a count
of how many TX queues were stopped and to wake the core TX queue only
when all had free space again.

The driver also previously (ab)used the per-hardware-queue stopped
flag as a counter to deal with various things that can inhibit TX, but
it no longer does that.

Remove the per-channel tx_stop_count, tx_stop_lock and
per-hardware-queue stopped count and just use the networking core
queue state directly.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      c04bfc6b
    • B
      sfc: Remove unused field and comment on a previously removed field · 6ecfd0c7
      由 Ben Hutchings 提交于 
      Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      6ecfd0c7
  17. 08 12月, 2010 1 次提交
    • B
      sfc: Fix crash in legacy onterrupt handler during ring reallocation · 94dec6a2
      由 Ben Hutchings 提交于 
      If we are using a legacy interrupt, our IRQ may be shared and our
interrupt handler may be called even though interrupts are disabled on
the NIC. When we change ring sizes, we reallocate the event queue and
the interrupt handler may use an invalid pointer when called for
another device's interrupt.

Maintain a legacy_irq_enabled flag and test that at the top of the
interrupt handler.  Note that this problem results from the need to
work around broken INT_ISR0 reads, and does not affect the legacy
interrupt handler for Falcon A1.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      94dec6a2
  19. 07 12月, 2010 2 次提交
    • B
      sfc: Use TX push whenever adding descriptors to an empty queue · cd38557d
      由 Ben Hutchings 提交于 
      Whenever we add DMA descriptors to a TX ring and update the ring
pointer, the TX DMA engine must first read the new DMA descriptors and
then start reading packet data.  However, all released Solarflare 10G
controllers have a 'TX push' feature that allows us to reduce latency
by writing the first new DMA descriptor along with the pointer update.
This is only useful when the queue is empty.  The hardware should
ignore the pushed descriptor if the queue is not empty, but this check
is buggy, so we must do it in software.

In order to tell whether a TX queue is empty, we need to compare the
previous transmission count (write_count) and completion count
(read_count).  However, if we do that every time we update the ring
pointer then read_count may ping-pong between the caches of two CPUs
running the transmission and completion paths for the queue.
Therefore, we split the check for an empty queue between the
completion path and the transmission path:

- Add an empty_read_count field representing a point at which the
  completion path saw the TX queue as empty.
- Add an old_write_count field for use on the completion path.
- On the completion path, whenever read_count reaches or passes
  old_write_count the TX queue may be empty.  We then read
  write_count, set empty_read_count if read_count == write_count,
  and update old_write_count.
- On the transmission path, we read empty_read_count.  If it's set, we
  compare it with the value of write_count before the current set of
  descriptors was added.  If they match, the queue really is empty and
  we can use TX push.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      cd38557d
    • B
      sfc: Reorder struct efx_nic to separate fields by volatility · ab28c12a
      由 Ben Hutchings 提交于 
      Place the regularly updated fields (locks, MAC stats, etc.) on a
separate cache-line from fields which are mostly constant.  This
should reduce cache misses for access to the latter on the data path.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
      ab28c12a
  21. 04 12月, 2010 6 次提交
  23. 21 10月, 2010 1 次提交
  25. 27 9月, 2010 1 次提交
  27. 23 9月, 2010 1 次提交
  29. 22 9月, 2010 2 次提交
  31. 14 9月, 2010 1 次提交
  33. 11 9月, 2010 5 次提交
  35. 09 7月, 2010 1 次提交
  37. 01 7月, 2010 1 次提交
  39. 26 6月, 2010 1 次提交
  41. 25 6月, 2010 3 次提交
  43. 03 6月, 2010 1 次提交