> From: netdev-ow...@vger.kernel.org [mailto:netdev- > ow...@vger.kernel.org] On Behalf Of Vinicius Costa Gomes > Sent: Friday, March 30, 2018 5:07 PM > To: intel-wired-...@lists.osuosl.org > Cc: Gomes, Vinicius <vinicius.go...@intel.com>; Kirsher, Jeffrey T > <jeffrey.t.kirs...@intel.com>; netdev@vger.kernel.org; Sanchez-Palencia, > Jesus <jesus.sanchez-palen...@intel.com>; Guedes, Andre > <andre.gue...@intel.com> > Subject: [next-queue PATCH] igb: Fix the transmission mode of queue 0 for > Qav mode > > When Qav mode is enabled, queue 0 should be kept on Stream Reservation > mode. From the i210 datasheet, section 8.12.19: > > "Note: Queue0 QueueMode must be set to 1b when TransmitMode is set to > Qav." ("QueueMode 1b" represents the Stream Reservation mode) > > The solution is to give queue 0 the all the credits it might need, so > it has priority over queue 1. > > A situation where this can happen is when cbs is "installed" only on > queue 1, leaving queue 0 alone. For example: > > $ tc qdisc replace dev enp2s0 handle 100: parent root mqprio num_tc 3 \ > map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@0 1@1 2@2 hw 0 > > $ tc qdisc replace dev enp2s0 parent 100:2 cbs locredit -1470 \ > hicredit 30 sendslope -980000 idleslope 20000 offload 1 > > Signed-off-by: Vinicius Costa Gomes <vinicius.go...@intel.com> > --- > drivers/net/ethernet/intel/igb/igb_main.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) >
Tested by: Aaron Brown <aaron.f.br...@intel.com>
