From patchwork Wed Jul 20 18:34:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Keller X-Patchwork-Id: 12924386 X-Patchwork-Delegate: dsahern@gmail.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC705C433EF for ; Wed, 20 Jul 2022 18:35:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231183AbiGTSfF (ORCPT ); Wed, 20 Jul 2022 14:35:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234599AbiGTSfC (ORCPT ); Wed, 20 Jul 2022 14:35:02 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 019D271BE8 for ; Wed, 20 Jul 2022 11:34:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1658342099; x=1689878099; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=/DbLDxdU8oHRtgWd+kF8AfuKz6dLM/ogY++Th6kdzbU=; b=IleYIHkbreZFVaPXdoBZxI7U+rW/t8Wb6kH3rEzjF/24Fj1dLUTemkwG 9kkPlG5s3l5moyNYrDmJkfcJOgQz/dwT8CvjOamHqdGOf3hALNp4Tp6mv nt2pdZK9yCKTQ43toAPLLFDxmlaU1AeintyjQq0x/MCxVJlFKyRJVYGYi UJHNdfOjmJ5NkQ+O3S9QJVH2/qA4baTBQiJnnk7IFAqYSRGWMyo3W3gVn k641+bCVpMZfa3RhWyRJdI2jIYeD4hF1OSJVYf/s11dl80nMcpl0IzhTQ em6FOlfg9PmZuw+rKdF871Um/gnaw/cwMs+MqB3nzIHoDFCp653E98cmg w==; X-IronPort-AV: E=McAfee;i="6400,9594,10414"; a="285620855" X-IronPort-AV: E=Sophos;i="5.92,287,1650956400"; d="scan'208";a="285620855" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2022 11:34:58 -0700 X-IronPort-AV: E=Sophos;i="5.92,287,1650956400"; d="scan'208";a="925337491" Received: from jekeller-desk.amr.corp.intel.com ([10.166.241.7]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2022 11:34:57 -0700 From: Jacob Keller To: netdev@vger.kernel.org Cc: Jakub Kicinski , Jacob Keller Subject: [iproute2-next PATCH 2/3] mnlg: add function to get CTRL_ATTR_MAXATTR value Date: Wed, 20 Jul 2022 11:34:48 -0700 Message-Id: <20220720183449.2070222-3-jacob.e.keller@intel.com> X-Mailer: git-send-email 2.35.1.456.ga9c7032d4631 In-Reply-To: <20220720183449.2070222-1-jacob.e.keller@intel.com> References: <20220720183449.2070222-1-jacob.e.keller@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: dsahern@gmail.com Add a new function to extract the CTRL_ATTR_MAXATTR attribute of the CTRL_CMD_GETFAMILY request. This will be used to allow reading the maximum supported devlink attribute of the running kernel in an upcoming change. Signed-off-by: Jacob Keller --- devlink/mnlg.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++ devlink/mnlg.h | 1 + 2 files changed, 57 insertions(+) diff --git a/devlink/mnlg.c b/devlink/mnlg.c index e6d92742c150..348c3ff5c959 100644 --- a/devlink/mnlg.c +++ b/devlink/mnlg.c @@ -41,6 +41,10 @@ struct group_info { const char *name; }; +struct family_info { + uint32_t max_attr; +}; + static int parse_mc_grps_cb(const struct nlattr *attr, void *data) { const struct nlattr **tb = data; @@ -149,6 +153,58 @@ int mnlg_socket_group_add(struct mnlu_gen_socket *nlg, const char *group_name) return 0; } +static int get_family_attr_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, CTRL_ATTR_MAX) < 0) + return MNL_CB_ERROR; + + tb[type] = attr; + return MNL_CB_OK; +} + +static int get_family_cb(const struct nlmsghdr *nlh, void *data) +{ + struct family_info *family = data; + struct nlattr *tb[CTRL_ATTR_MAX + 1] = {}; + struct genlmsghdr *genl = mnl_nlmsg_get_payload(nlh); + + mnl_attr_parse(nlh, sizeof(*genl), get_family_attr_cb, tb); + if (!tb[CTRL_ATTR_MAXATTR]) + return MNL_CB_ERROR; + + family->max_attr = mnl_attr_get_u32(tb[CTRL_ATTR_MAXATTR]); + + return MNL_CB_OK; +} + +int mnlg_socket_get_max_attr(struct mnlu_gen_socket *nlg, uint32_t *max_attr) +{ + struct nlmsghdr *nlh; + struct family_info family; + int err; + + nlh = _mnlu_gen_socket_cmd_prepare(nlg, CTRL_CMD_GETFAMILY, + NLM_F_REQUEST | NLM_F_ACK, + GENL_ID_CTRL, 1); + + mnl_attr_put_u16(nlh, CTRL_ATTR_FAMILY_ID, nlg->family); + + err = mnlg_socket_send(nlg, nlh); + if (err < 0) + return err; + + err = mnlu_gen_socket_recv_run(nlg, get_family_cb, &family); + if (err < 0) + return err; + + *max_attr = family.max_attr; + + return 0; +} + int mnlg_socket_get_fd(struct mnlu_gen_socket *nlg) { return mnl_socket_get_fd(nlg->nl); diff --git a/devlink/mnlg.h b/devlink/mnlg.h index 24aa17566a9b..6348ad45ed26 100644 --- a/devlink/mnlg.h +++ b/devlink/mnlg.h @@ -18,6 +18,7 @@ struct mnlu_gen_socket; int mnlg_socket_send(struct mnlu_gen_socket *nlg, const struct nlmsghdr *nlh); int mnlg_socket_group_add(struct mnlu_gen_socket *nlg, const char *group_name); +int mnlg_socket_get_max_attr(struct mnlu_gen_socket *nlg, uint32_t *max_attr); int mnlg_socket_get_fd(struct mnlu_gen_socket *nlg); #endif /* _MNLG_H_ */