Commit d8f45be0 authored by Vinicius Costa Gomes's avatar Vinicius Costa Gomes Committed by Tony Nguyen
Browse files

igc: Use strict cycles for Qbv scheduling 



Configuring strict cycle mode in the controller forces more well
behaved transmissions when taprio is offloaded.

When set this strict_cycle and strict_end, transmission is not
enabled if the whole packet cannot be completed before end of
the Qbv cycle.

Fixes: 82faa9b7 ("igc: Add support for ETF offloading")
Signed-off-by: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: default avatarAravindhan Gunasekaran <aravindhan.gunasekaran@intel.com>
Signed-off-by: default avatarMuhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Tested-by: default avatarNaama Meir <naamax.meir@linux.intel.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent db0b124f

drivers/net/ethernet/intel/igc/igc_tsn.c

+2 −9
Original line number Diff line number Diff line
@@ -140,15 +140,8 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter) 
		wr32(IGC_STQT(i), ring->start_time);

		wr32(IGC_ENDQT(i), ring->end_time);



		if (adapter->base_time) {

			/* If we have a base_time we are in "taprio"

			 * mode and we need to be strict about the

			 * cycles: only transmit a packet if it can be

			 * completed during that cycle.

			 */

		txqctl |= IGC_TXQCTL_STRICT_CYCLE |

			IGC_TXQCTL_STRICT_END;

		}



		if (ring->launchtime_enable)

			txqctl |= IGC_TXQCTL_QUEUE_MODE_LAUNCHT;