ice: Only bump Rx tail and release buffers once per napi_poll

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Currently we bump the Rx tail and release/give buffers to hardware every
16 descriptors. This causes us to bump Rx tail up to 4 times per
napi_poll call. Also we are always bumping tail on an odd index and this
is a problem because hardware ignores the lower 3 bits in the QRX_TAIL
register. This is making it so hardware sees tail bumps only every 8
descriptors. Instead lets only bump Rx tail once per napi_poll if
the value aligns with hardware's expectations of the lower 3 bits being
cleared. Also only release/give Rx buffers once per napi_poll call.

Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Brett Creeley 2019-06-26 02:20:19 -07:00 • committed by Jeff Kirsher

parent c7aeb4d1b9

commit cb7db35641

1 changed files with 27 additions and 15 deletions

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drivers/net/ethernet/intel/ice/ice_txrx.c

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