igb: Use dma_wmb() instead of wmb() before doorbell writes

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igb writes to doorbells to post transmit and receive descriptors;
after writing descriptors to memory but before writing to doorbells,
use dma_wmb() rather than wmb(). wmb() is more heavyweight than
necessary before doorbell writes.

On x86, this avoids SFENCEs before doorbell writes in both the
tx and rx refill paths.

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Venkatesh Srinivas 2018-05-25 00:13:21 -04:00 • committed by Jeff Kirsher

parent 2a83fba6ca

commit 73017f4e05

1 changed files with 2 additions and 2 deletions

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drivers/net/ethernet/intel/igb/igb_main.c

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