igb: dont drop packets if rx flow control is enabled

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If Rx flow control has been enabled (via autoneg or forced), packets
should not be dropped due to Rx descriptor ring exhaustion. Instead
pause frames should be used to apply back pressure. This only applies
if VFs are not in use.

Move SRRCTL setup to its own function for easy reuse and only set drop
enable bit if Rx flow control is not enabled.

Since v1: always enable dropping of packets if VFs in use.

Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

...

This commit is contained in:

Robert Beckett 2019-10-22 16:31:41 +01:00 • committed by Jeff Kirsher

parent 9e860947d8

commit 6506f52dcb

3 changed files with 42 additions and 14 deletions

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1

drivers/net/ethernet/intel/igb/igb.h

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8

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

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47

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

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