i40evf: enforce descriptor write-back mechanism for VF

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The current driver mode is to use a write-back mechanism for the head
register which indicates transmit completions. The VF driver needs to be
able to work on hardware that exclusively uses descriptor write-back, so
change the default driver mode of operation to descriptor write-back for
VF. In our analysis, performance wasn't significantly different with
either write-back method.

Change-ID: Ia92e4ec77c2df8dc4515c71d53746d57d77759af
Signed-off-by: Preethi Banala <preethi.banala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Preethi Banala 2017-03-10 12:22:00 -08:00 • committed by Jeff Kirsher

parent 0e42c72195

commit b1cb07db6e

3 changed files with 7 additions and 75 deletions

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64

drivers/net/ethernet/intel/i40evf/i40e_txrx.c

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14

drivers/net/ethernet/intel/i40evf/i40e_txrx.h

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4

drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c

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