From: Jedrzej Jagielski Date: Tue, 14 Dec 2021 10:08:22 +0000 (+0000) Subject: i40e: Fix reset bw limit when DCB enabled with 1 TC X-Git-Tag: v5.15.73~7399 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=047fc3396cc65cc70124e2951576175b8ad9929c;p=platform%2Fkernel%2Flinux-rpi.git i40e: Fix reset bw limit when DCB enabled with 1 TC commit 3d2504663c41104b4359a15f35670cfa82de1bbf upstream. There was an AQ error I40E_AQ_RC_EINVAL when trying to reset bw limit as part of bw allocation setup. This was caused by trying to reset bw limit with DCB enabled. Bw limit should not be reset when DCB is enabled. The code was relying on the pf->flags to check if DCB is enabled but if only 1 TC is available this flag will not be set even though DCB is enabled. Add a check for number of TC and if it is 1 don't try to reset bw limit even if pf->flags shows DCB as disabled. Fixes: fa38e30ac73f ("i40e: Fix for Tx timeouts when interface is brought up if DCB is enabled") Suggested-by: Alexander Lobakin # Flatten the condition Signed-off-by: Sylwester Dziedziuch Signed-off-by: Jedrzej Jagielski Reviewed-by: Alexander Lobakin Tested-by: Imam Hassan Reza Biswas Signed-off-by: Tony Nguyen Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 20c8c0231e2c..b2a53d24dec5 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -5372,7 +5372,15 @@ static int i40e_vsi_configure_bw_alloc(struct i40e_vsi *vsi, u8 enabled_tc, /* There is no need to reset BW when mqprio mode is on. */ if (pf->flags & I40E_FLAG_TC_MQPRIO) return 0; - if (!vsi->mqprio_qopt.qopt.hw && !(pf->flags & I40E_FLAG_DCB_ENABLED)) { + + if (!vsi->mqprio_qopt.qopt.hw) { + if (pf->flags & I40E_FLAG_DCB_ENABLED) + goto skip_reset; + + if (IS_ENABLED(CONFIG_I40E_DCB) && + i40e_dcb_hw_get_num_tc(&pf->hw) == 1) + goto skip_reset; + ret = i40e_set_bw_limit(vsi, vsi->seid, 0); if (ret) dev_info(&pf->pdev->dev, @@ -5380,6 +5388,8 @@ static int i40e_vsi_configure_bw_alloc(struct i40e_vsi *vsi, u8 enabled_tc, vsi->seid); return ret; } + +skip_reset: memset(&bw_data, 0, sizeof(bw_data)); bw_data.tc_valid_bits = enabled_tc; for (i = 0; i < I40E_MAX_TRAFFIC_CLASS; i++)