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sfc: Use TX PIO for sufficiently small packets

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Sufficiently small linear packets can be copied into the PIO buffer
with a single call to memcpy_toio().  Non-linear packets require an
intermediate cache-line-sized buffer.

[bwh: I wrote the first version of this, but Jon did the hard work to
 handle non-linear packets.]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Jon Cooper
2013-09-02 18:24:29 +01:00
committed by Ben Hutchings
parent 0fe5565b64
commit ee45fd92c7
4 changed files with 155 additions and 0 deletions
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2
drivers/net/ethernet/sfc/net_driver.h
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@ -212,6 +212,7 @@ struct efx_tx_buffer {
* blocks
* @tso_packets: Number of packets via the TSO xmit path
* @pushes: Number of times the TX push feature has been used
* @pio_packets: Number of times the TX PIO feature has been used
* @empty_read_count: If the completion path has seen the queue as empty
* and the transmission path has not yet checked this, the value of
* @read_count bitwise-added to %EFX_EMPTY_COUNT_VALID; otherwise 0.
@ -243,6 +244,7 @@ struct efx_tx_queue {
unsigned int tso_long_headers;
unsigned int tso_packets;
unsigned int pushes;
unsigned int pio_packets;
/* Members shared between paths and sometimes updated */
unsigned int empty_read_count ____cacheline_aligned_in_smp;