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igc: Use strict cycles for Qbv scheduling

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[ Upstream commit d8f45be01dd9381065a3778a579385249ed011dc ]

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: 82faa9b799 ("igc: Add support for ETF offloading")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Aravindhan Gunasekaran <aravindhan.gunasekaran@intel.com>
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vinicius Costa Gomes
2022-12-09 12:15:18 +08:00
committed by Greg Kroah-Hartman
parent 413fe82420
commit a0e2295c2a
1 changed files with 2 additions and 9 deletions
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11
drivers/net/ethernet/intel/igc/igc_tsn.c
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@@ -92,15 +92,8 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
wr32(IGC_STQT(i), ring->start_time); wr32(IGC_STQT(i), ring->start_time);
wr32(IGC_ENDQT(i), ring->end_time); wr32(IGC_ENDQT(i), ring->end_time);
if (adapter->base_time) { txqctl |= IGC_TXQCTL_STRICT_CYCLE |
/* If we have a base_time we are in "taprio" IGC_TXQCTL_STRICT_END;
* 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) if (ring->launchtime_enable)
txqctl |= IGC_TXQCTL_QUEUE_MODE_LAUNCHT; txqctl |= IGC_TXQCTL_QUEUE_MODE_LAUNCHT;