提交 · a461103ba2e22cbb70771588b36f40df39a50f46 · openanolis / cloud-kernel

01 3月, 2011 2 次提交

sfc: Reduce size of efx_rx_buffer further by removing data member · a526f140

由 Steve Hodgson 提交于 2月 24, 2011

Instead calculate the KVA of receive data. It's not like it's a hard sum.

[bwh: Fixed to work with GRO.]
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>

a526f140

S
sfc: Reduce size of efx_rx_buffer by unionising skb and page · 8ba5366a
由 Steve Hodgson 提交于 2月 24, 2011
```
[bwh: Forward-ported to net-next-2.6.]
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
```
8ba5366a

18 2月, 2011 1 次提交

sfc: Implement hardware acceleration of RFS · 64d8ad6d

由 Ben Hutchings 提交于 1月 05, 2011

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

16 2月, 2011 2 次提交

sfc: Add TX queues for high-priority traffic · 94b274bf

由 Ben Hutchings 提交于 1月 10, 2011

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

sfc: Distinguish queue lookup from test for queue existence · 525da907

由 Ben Hutchings 提交于 2月 07, 2011

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

25 1月, 2011 1 次提交

net: change netdev->features to u32 · 04ed3e74

由 Michał Mirosław 提交于 1月 24, 2011

Quoting Ben Hutchings: we presumably won't be defining features that
can only be enabled on 64-bit architectures.

Occurences found by `grep -r` on net/, drivers/net, include/

[ Move features and vlan_features next to each other in
  struct netdev, as per Eric Dumazet's suggestion -DaveM ]
Signed-off-by: NMichał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

04ed3e74

14 1月, 2011 1 次提交
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  sfc: Make efx_get_tx_queue() an inline function · 97653431
  由 Ben Hutchings 提交于 1月 12, 2011
```
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
```
  97653431
11 12月, 2010 2 次提交

sfc: Remove ancient support for nesting of TX stop · c04bfc6b

由 Ben Hutchings 提交于 12月 10, 2010

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 12月 10, 2010
```
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
```
6ecfd0c7

08 12月, 2010 1 次提交

sfc: Fix crash in legacy onterrupt handler during ring reallocation · 94dec6a2

由 Ben Hutchings 提交于 12月 07, 2010

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

07 12月, 2010 2 次提交

sfc: Use TX push whenever adding descriptors to an empty queue · cd38557d

由 Ben Hutchings 提交于 11月 15, 2010

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

sfc: Reorder struct efx_nic to separate fields by volatility · ab28c12a

由 Ben Hutchings 提交于 12月 06, 2010

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

04 12月, 2010 6 次提交

sfc: Store MAC address from NVRAM in net_device::perm_addr · 7e300bc8