[{"id":3683243,"web_url":"http://patchwork.ozlabs.org/comment/3683243/","msgid":"","list_archive_url":null,"date":"2026-04-28T08:34:32","subject":"Re: [Intel-wired-lan] [PATCH iwl-net v1 2/2] ice: use\n NETIF_F_HW_CSUM instead of IP/IPV6","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/people/75597/","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"content":"> -----Original Message-----\n> From: Michal Swiatkowski \n> Sent: Tuesday, April 28, 2026 9:07 AM\n> To: intel-wired-lan@lists.osuosl.org\n> Cc: netdev@vger.kernel.org; jramaseu@redhat.com; Nguyen, Anthony L\n> ; Kitszel, Przemyslaw\n> ; Loktionov, Aleksandr\n> ; Michal Swiatkowski\n> \n> Subject: [PATCH iwl-net v1 2/2] ice: use NETIF_F_HW_CSUM instead of\n> IP/IPV6\n> \n> The hardware is capable of calculating checksum for IPV6 packets with\n> extension header. To not drop such packets switch from IP/IPV6\n> checksum to HW_CSUM.\nI'd recommend \"To not drop\" -> \"To avoid dropping\"\n\n> \n> HW_CSUM is also used in previous generation (i40e).\n> \n> Previously HW_CSUM was used to indicate that hardware supports general\n> checksum. Drop it assuming that if the hardware supports it, it is\n> used.\n> \n> Disabling offload for E830 in case of TSO isn't needed anymore as the\n> check for TSO is done in Tx path just before preparation of the\n> special GCS descriptor.\n> \n> The commit from Fixes didn't introduce a bug, it just shown that the\n> driver is doing sth wrong with the checksum features.\n> \n\n\nExcept commit message nits\nReviewed-by: Aleksandr Loktionov \n\n> Suggested-by: Jakub Ramaseuski \n> Reviewed-by: Przemek Kitszel \n> Fixes: 04c20a9356f2 (\"net: skip offload for NETIF_F_IPV6_CSUM if ipv6\n> header contains extension\")\n> Signed-off-by: Michal Swiatkowski \n> ---\n> drivers/net/ethernet/intel/ice/ice_main.c | 21 +--------------------\n> 1 file changed, 1 insertion(+), 20 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c\n> b/drivers/net/ethernet/intel/ice/ice_main.c\n> index 15550216fbf0..0f2f949af536 100644\n> --- a/drivers/net/ethernet/intel/ice/ice_main.c\n> +++ b/drivers/net/ethernet/intel/ice/ice_main.c\n> @@ -3500,9 +3500,8 @@ void ice_set_netdev_features(struct net_device\n> *netdev)\n> \t\t\tNETIF_F_RXHASH;\n> \n> \tcsumo_features = NETIF_F_RXCSUM\t |\n> -\t\t\t NETIF_F_IP_CSUM |\n> \t\t\t NETIF_F_SCTP_CRC |\n> -\t\t\t NETIF_F_IPV6_CSUM;\n> +\t\t\t NETIF_F_HW_CSUM;\n> \n> \tvlano_features = NETIF_F_HW_VLAN_CTAG_FILTER |\n> \t\t\t NETIF_F_HW_VLAN_CTAG_TX |\n> @@ -3564,12 +3563,6 @@ void ice_set_netdev_features(struct net_device\n> *netdev)\n> \t/* Allow core to manage IRQs affinity */\n> \tnetif_set_affinity_auto(netdev);\n> \n> -\t/* Mutual exclusivity for TSO and GCS is enforced by the set\n> features\n> -\t * ndo callback.\n> -\t */\n> -\tif (ice_is_feature_supported(pf, ICE_F_GCS))\n> -\t\tnetdev->hw_features |= NETIF_F_HW_CSUM;\n> -\n> \tnetif_set_tso_max_size(netdev, ICE_MAX_TSO_SIZE); }\n> \n> @@ -6489,18 +6482,6 @@ ice_set_features(struct net_device *netdev,\n> netdev_features_t features)\n> \tif (changed & NETIF_F_LOOPBACK)\n> \t\tret = ice_set_loopback(vsi, !!(features &\n> NETIF_F_LOOPBACK));\n> \n> -\t/* Due to E830 hardware limitations, TSO (NETIF_F_ALL_TSO) with\n> GCS\n> -\t * (NETIF_F_HW_CSUM) is not supported.\n> -\t */\n> -\tif (ice_is_feature_supported(pf, ICE_F_GCS) &&\n> -\t ((features & NETIF_F_HW_CSUM) && (features &\n> NETIF_F_ALL_TSO))) {\n> -\t\tif (netdev->features & NETIF_F_HW_CSUM)\n> -\t\t\tdev_err(ice_pf_to_dev(pf), \"To enable TSO, you\n> must first disable HW checksum.\\n\");\n> -\t\telse\n> -\t\t\tdev_err(ice_pf_to_dev(pf), \"To enable HW\n> checksum, you must first disable TSO.\\n\");\n> -\t\treturn -EIO;\n> -\t}\n> -\n> \treturn ret;\n> }\n> \n> --\n> 2.49.0","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=LPxm/Lng;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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