From d8ec98646483a9e1c0c9f511236ce8b933deed17 Mon Sep 17 00:00:00 2001 From: Alan Brady Date: Wed, 27 Jul 2016 12:02:38 -0700 Subject: [PATCH] i40e: fix lookup table when RSS disabled/enabled This patch fixes the bug which causes RSS to continue to work after being disabled. After disabling RSS, traffic would continue to be assigned to different queues instead of falling back to a single queue. Without this patch, attempting to disable RSS would not work as expected. This patch fixes the bug by clearing the lookup table used by RSS such that all traffic is assigned to a single queue. This patch also addresses the issue of reinstating the lookup table should RSS then be re-enabled. Change-ID: Ib20c7c6a7e9f1f772bb787370f8a8c664796b141 Signed-off-by: Alan Brady Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40e/i40e_main.c | 28 +++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 8c68ac1886d8..704cd7da52c7 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -8690,6 +8690,28 @@ bool i40e_set_ntuple(struct i40e_pf *pf, netdev_features_t features) return need_reset; } +/** + * i40e_clear_rss_lut - clear the rx hash lookup table + * @vsi: the VSI being configured + **/ +static void i40e_clear_rss_lut(struct i40e_vsi *vsi) +{ + struct i40e_pf *pf = vsi->back; + struct i40e_hw *hw = &pf->hw; + u16 vf_id = vsi->vf_id; + u8 i; + + if (vsi->type == I40E_VSI_MAIN) { + for (i = 0; i <= I40E_PFQF_HLUT_MAX_INDEX; i++) + wr32(hw, I40E_PFQF_HLUT(i), 0); + } else if (vsi->type == I40E_VSI_SRIOV) { + for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) + i40e_write_rx_ctl(hw, I40E_VFQF_HLUT1(i, vf_id), 0); + } else { + dev_err(&pf->pdev->dev, "Cannot set RSS LUT - invalid VSI type\n"); + } +} + /** * i40e_set_features - set the netdev feature flags * @netdev: ptr to the netdev being adjusted @@ -8703,6 +8725,12 @@ static int i40e_set_features(struct net_device *netdev, struct i40e_pf *pf = vsi->back; bool need_reset; + if (features & NETIF_F_RXHASH && !(netdev->features & NETIF_F_RXHASH)) + i40e_pf_config_rss(pf); + else if (!(features & NETIF_F_RXHASH) && + netdev->features & NETIF_F_RXHASH) + i40e_clear_rss_lut(vsi); + if (features & NETIF_F_HW_VLAN_CTAG_RX) i40e_vlan_stripping_enable(vsi); else -- 2.30.2