igb: Only change Tx arbitration when CBS is on

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Currently the data transmission arbitration algorithm - DataTranARB
field on TQAVCTRL reg - is always set to CBS when the Tx mode is
changed from legacy to 'Qav' mode.

Make that configuration a bit more granular in preparation for the
upcoming Launchtime enabling patches, since CBS and Launchtime can be
enabled separately. That is achieved by moving the DataTranARB setup
to igb_config_tx_modes() instead.

Similarly, when disabling CBS we must check if it has been disabled
for all queues, and clear the DataTranARB accordingly.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Jesus Sanchez-Palencia 2018-07-03 15:42:56 -07:00 • committed by David S. Miller

parent 91db364236

commit 0364a0d0e7

1 changed files with 33 additions and 16 deletions

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49

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

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