From 1c1c373943d81b9a8f5613dfec0f900d5eb0f563 Mon Sep 17 00:00:00 2001 From: Rui Salvaterra Date: Fri, 28 Mar 2025 16:00:39 +0000 Subject: [PATCH] kernel: backport igc hw vlan patch to 24.10 Fix an abysmal out-of-the-box performance issue with igc-supported Ethernet controllers and 802.1Q. Signed-off-by: Rui Salvaterra --- ...an-tag-insertion-stripping-by-defaul.patch | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 target/linux/generic/backport-6.6/792-v6.16-igc-enable-HW-vlan-tag-insertion-stripping-by-defaul.patch diff --git a/target/linux/generic/backport-6.6/792-v6.16-igc-enable-HW-vlan-tag-insertion-stripping-by-defaul.patch b/target/linux/generic/backport-6.6/792-v6.16-igc-enable-HW-vlan-tag-insertion-stripping-by-defaul.patch new file mode 100644 index 0000000000..0ca219457c --- /dev/null +++ b/target/linux/generic/backport-6.6/792-v6.16-igc-enable-HW-vlan-tag-insertion-stripping-by-defaul.patch @@ -0,0 +1,32 @@ +From 8cae5a0d91fea01d90ce7c1827e26934a22ca2fa Mon Sep 17 00:00:00 2001 +From: Rui Salvaterra +Date: Wed, 5 Mar 2025 11:53:56 +0000 +Subject: [PATCH] igc: enable HW vlan tag insertion/stripping by default + +This is enabled by default in other Intel drivers I've checked (e1000, e1000e, +iavf, igb and ice). Fixes an out-of-the-box performance issue when running +OpenWrt on typical mini-PCs with igc-supported Ethernet controllers and 802.1Q +VLAN configurations, as ethtool isn't part of the default packages and sane +defaults are expected. + +In my specific case, with an Intel N100-based machine with four I226-V Ethernet +controllers, my upload performance increased from under 30 Mb/s to the expected +~1 Gb/s. + +Signed-off-by: Rui Salvaterra +--- + drivers/net/ethernet/intel/igc/igc_main.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/drivers/net/ethernet/intel/igc/igc_main.c ++++ b/drivers/net/ethernet/intel/igc/igc_main.c +@@ -6850,6 +6850,9 @@ static int igc_probe(struct pci_dev *pde + netdev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT | + NETDEV_XDP_ACT_XSK_ZEROCOPY; + ++ /* enable HW vlan tag insertion/stripping by default */ ++ netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX; ++ + /* MTU range: 68 - 9216 */ + netdev->min_mtu = ETH_MIN_MTU; + netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE; -- 2.30.2