From d8a87856607ebcc5456feb96f6a639b2b0fd746f Mon Sep 17 00:00:00 2001 From: Mitch Williams Date: Mon, 18 Dec 2017 05:17:42 -0500 Subject: [PATCH] i40e: check for invalid DCB config The driver (and the entire netdev layer for that matter) assumes that TC0 will always be present in our DCB configuration. Unfortunately, this isn't always the case. Rather than fail to configure the VSI, let's go ahead and try to make it work, even though DCB will end up being disabled by the kernel. If the driver fails to configure DCB, the driver queries what's valid, then writes that back to the hardware, always forcing TC0. This fixes a bug where the driver could fail to adhere to ETS BW allocations if 8 TCs were configured on the switch. Signed-off-by: Mitch Williams Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_main.c | 34 ++++++++++++++++++++++++++++- 1 file changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 69d15560fdf9..d66470d75601 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -5244,6 +5244,8 @@ static void i40e_vsi_update_queue_map(struct i40e_vsi *vsi, static int i40e_vsi_config_tc(struct i40e_vsi *vsi, u8 enabled_tc) { u8 bw_share[I40E_MAX_TRAFFIC_CLASS] = {0}; + struct i40e_pf *pf = vsi->back; + struct i40e_hw *hw = &pf->hw; struct i40e_vsi_context ctxt; int ret = 0; int i; @@ -5261,10 +5263,40 @@ static int i40e_vsi_config_tc(struct i40e_vsi *vsi, u8 enabled_tc) ret = i40e_vsi_configure_bw_alloc(vsi, enabled_tc, bw_share); if (ret) { + struct i40e_aqc_query_vsi_bw_config_resp bw_config = {0}; + dev_info(&vsi->back->pdev->dev, "Failed configuring TC map %d for VSI %d\n", enabled_tc, vsi->seid); - goto out; + ret = i40e_aq_query_vsi_bw_config(hw, vsi->seid, + &bw_config, NULL); + if (ret) { + dev_info(&pf->pdev->dev, + "Failed querying vsi bw info, err %s aq_err %s\n", + i40e_stat_str(hw, ret), + i40e_aq_str(hw, hw->aq.asq_last_status)); + goto out; + } + if ((bw_config.tc_valid_bits & enabled_tc) != enabled_tc) { + u8 valid_tc = bw_config.tc_valid_bits & enabled_tc; + + if (!valid_tc) + valid_tc = bw_config.tc_valid_bits; + /* Always enable TC0, no matter what */ + valid_tc |= 1; + dev_info(&pf->pdev->dev, + "Requested tc 0x%x, but FW reports 0x%x as valid. Attempting to use 0x%x.\n", + enabled_tc, bw_config.tc_valid_bits, valid_tc); + enabled_tc = valid_tc; + } + + ret = i40e_vsi_configure_bw_alloc(vsi, enabled_tc, bw_share); + if (ret) { + dev_err(&pf->pdev->dev, + "Unable to configure TC map %d for VSI %d\n", + enabled_tc, vsi->seid); + goto out; + } } /* Update Queue Pairs Mapping for currently enabled UPs */ -- 2.11.0