[{"id":3688157,"web_url":"http://patchwork.ozlabs.org/comment/3688157/","msgid":"","list_archive_url":null,"date":"2026-05-08T04:44:13","subject":"Re: [Intel-wired-lan] [PATCH iwl-next 3/8] ixgbe: prevent adding\n duplicate FDIR perfect filter rules","submitter":{"id":85252,"url":"http://patchwork.ozlabs.org/api/people/85252/","name":"Przemek Kitszel","email":"przemyslaw.kitszel@intel.com"},"content":"On 5/8/26 05:12, Aleksandr Loktionov wrote:\n> From: Piotr Skajewski \n> \n> When the same flow specification is added twice (same 5-tuple with\n> different sw_idx values), ixgbe_add_ethtool_fdir_entry() silently\n> programs the duplicate into hardware using a second FDIR table slot.\n> This wastes a scarce FDIR entry and can cause confusing behaviour\n> when deleting rules.\n> \n> Add a helper ixgbe_match_ethtool_fdir_entry() that walks the in-kernel\n> filter list before programming hardware. If an entry with an\n> identical filter (excluding the sw_idx) already exists, the new add\n> request is rejected with -EEXIST.\n> \n> Signed-off-by: Piotr Skajewski \n> Signed-off-by: Aleksandr Loktionov \n> ---\n> .../net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 27 +++++++++++++++++--\n> 1 file changed, 25 insertions(+), 2 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c\n> index ba049b3..a2009df 100644\n> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c\n> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c\n> @@ -2938,6 +2938,23 @@ static int ixgbe_flowspec_to_flow_type(struct ethtool_rx_flow_spec *fsp,\n> \treturn 1;\n> }\n> \n> +static bool ixgbe_match_ethtool_fdir_entry(struct ixgbe_adapter *adapter,\n> +\t\t\t\t\t struct ixgbe_fdir_filter *input)\n> +{\n> +\tstruct ixgbe_fdir_filter *rule = NULL;\n> +\n> +\thlist_for_each_entry(rule, &adapter->fdir_filter_list, fdir_node) {\n> +\t\tif (rule->sw_idx == input->sw_idx)\n> +\t\t\tcontinue;\n\nthis if makes it possible to add rule with the same filter AND the same\nsw_idx\n\n> +\t\tif (!memcmp(&rule->filter, &input->filter,\n> +\t\t\t sizeof(rule->filter))) {\n> +\t\t\te_warn(drv, \"FDIR filter already exists\\n\");\n\nreturn code of -EEXIST returned to the user is enough,\nno need for a warning here\n\nif you really want a dmesg entry, then make it info and of not alarming\nwording\n\n> +\t\t\treturn true;\n> +\t\t}\n> +\t}\n> +\treturn false;\n> +}\n> +\n> static int ixgbe_add_ethtool_fdir_entry(struct ixgbe_adapter *adapter,\n> \t\t\t\t\tstruct ethtool_rxnfc *cmd)\n> {\n> @@ -2947,7 +2964,7 @@ static int ixgbe_add_ethtool_fdir_entry(struct ixgbe_adapter *adapter,\n> \tstruct ixgbe_fdir_filter *input;\n> \tunion ixgbe_atr_input mask;\n> \tu8 queue;\n> -\tint err;\n> +\tint err = -EINVAL;\n\nRCT\n\n> \n> \tif (!(adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE))\n> \t\treturn -EOPNOTSUPP;\n> @@ -3050,6 +3067,12 @@ static int ixgbe_add_ethtool_fdir_entry(struct ixgbe_adapter *adapter,\n> \t/* apply mask and compute/store hash */\n> \tixgbe_atr_compute_perfect_hash_82599(&input->filter, &mask);\n> \n> +\t/* check for a duplicate filter */\n> +\tif (ixgbe_match_ethtool_fdir_entry(adapter, input)) {\n> +\t\terr = -EEXIST;\n> +\t\tgoto err_out_w_lock;\n> +\t}\n> +\n> \t/* program filters to filter memory */\n> \terr = ixgbe_fdir_write_perfect_filter_82599(hw,\n> \t\t\t\t&input->filter, input->sw_idx, queue);\n> @@ -3065,7 +3088,7 @@ static int ixgbe_add_ethtool_fdir_entry(struct ixgbe_adapter *adapter,\n> \tspin_unlock(&adapter->fdir_perfect_lock);\n> err_out:\n> \tkfree(input);\n> -\treturn -EINVAL;\n> +\treturn err;\n> }\n> \n> static int ixgbe_del_ethtool_fdir_entry(struct ixgbe_adapter *adapter,","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=lw/RlS3N;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.138; 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