From patchwork Thu Oct 24 11:18:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Johannes Berg X-Patchwork-Id: 13848795 X-Patchwork-Delegate: kuba@kernel.org Received: from sipsolutions.net (s3.sipsolutions.net [168.119.38.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 82F431CBA01; Thu, 24 Oct 2024 11:18:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=168.119.38.16 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729768698; cv=none; b=qf1mxiOKZARYAZvCWtSg1C2rfKVX+gYWnV8MFhVYFtCJKqNJrP9er7IxRF9Edpe9EV8ctj14MSYylXpU5uan8wRi8J3AXUffzJzJNU3mygp7ZzcCbJxmVpWAs0HOtQyBk8Rb2Gmnjn7Uw5BF1ohK7vlpBW04h76C5HjUuFK2Sm0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729768698; c=relaxed/simple; bh=59jHo68Y6SScJHLi3K2HIU9q5D4tmFms/qpVNyiNu94=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=OkHVjGWuL//H+NO8qRwHUPNgX5VmQemdVNcMwyfW47v8ALY/YTCPKuduaWTfMxOXX4OvEd7CBjQ+Y4kQ0sS2Bz541VFPq7J8PAp0MXWyy63wQBFP+mWs1K6TZPV/XKDGUuEqjVMVjG1UnmU4YtQ3Zl7Inz20lnt7l7khopt4uOs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net; spf=pass smtp.mailfrom=sipsolutions.net; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b=NWg9/jo+; arc=none smtp.client-ip=168.119.38.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b="NWg9/jo+" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=Content-Transfer-Encoding:MIME-Version: Message-ID:Date:Subject:Cc:To:From:Content-Type:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-To:Resent-Cc: Resent-Message-ID:In-Reply-To:References; bh=P29q5KJfDcxk3PgYOr8w6GLSS5HSQNSBPFbyVcSvwW0=; t=1729768696; x=1730978296; b=NWg9/jo+1tk96Hk4bGsYj/qh3guMxXyudcrIAt/YHW+Mxlkd4kVEDYWqG3dkbvrbOaGcAu0srjt 0wzvtCmXVwvOg9ThXtuwPcQEe78ulnTnVZyWDNFAxbpkU+7WouI34QX9TcYUs8tk+1jJptQonsLoD 7UKXk/AyFfWjpkw5kkr+gv2URz569uSWiULiBt/1F42khFBJc7WnrMCQTKBZBut3lEjpRZycdE2Xg 2bF+5TwkIpD48aa24X9Ba5e7VMpd7rKnNzcCuxweMHb6HKETASj1M9u5klCYk+f5pGjGyHxt1cmfY xsH8xqIN+VF24h2w9EclrRrutYLmnhvCdorA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.98) (envelope-from ) id 1t3vr0-00000003bsi-1cE2; Thu, 24 Oct 2024 13:18:10 +0200 From: Johannes Berg To: linux-wireless@vger.kernel.org, netdev@vger.kernel.org Cc: Johannes Berg Subject: [RFC PATCH 1/2] net: netlink: add nla_get_*_default() accessors Date: Thu, 24 Oct 2024 13:18:06 +0200 Message-ID: <20241024131807.0a6c07355832.I3df6aac71d38a5baa1c0a03d0c7e82d4395c030e@changeid> X-Mailer: git-send-email 2.47.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC From: Johannes Berg There are quite a number of places that use patterns such as if (attr) val = nla_get_u16(attr); else val = DEFAULT; Add nla_get_u16_default() and friends like that to not have to type this out all the time. Signed-off-by: Johannes Berg Acked-by: Toke Høiland-Jørgensen Acked-by: Jakub Kicinski --- include/net/netlink.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/include/net/netlink.h b/include/net/netlink.h index db6af207287c..b15bd0437945 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -142,6 +142,8 @@ * nla_get_flag(nla) return 1 if flag is true * nla_get_msecs(nla) get payload for a msecs attribute * + * The same functions also exist with _default(). + * * Attribute Misc: * nla_memcpy(dest, nla, count) copy attribute into memory * nla_memcmp(nla, data, size) compare attribute with memory area @@ -1867,6 +1869,31 @@ static inline unsigned long nla_get_msecs(const struct nlattr *nla) return msecs_to_jiffies((unsigned long) msecs); } +#define MAKE_NLA_GET_DEFAULT(tp, fn) \ +static inline tp fn##_default(const struct nlattr *nla, \ + tp defvalue) \ +{ \ + if (!nla) \ + return defvalue; \ + return n(nla); \ +} + +MAKE_NLA_GET_DEFAULT(u8, nla_get_u8); +MAKE_NLA_GET_DEFAULT(u16, nla_get_u16); +MAKE_NLA_GET_DEFAULT(u32, nla_get_u32); +MAKE_NLA_GET_DEFAULT(u64, nla_get_u64); +MAKE_NLA_GET_DEFAULT(unsigned long, nla_get_msecs); +MAKE_NLA_GET_DEFAULT(s8, nla_get_s8); +MAKE_NLA_GET_DEFAULT(s16, nla_get_s16); +MAKE_NLA_GET_DEFAULT(s32, nla_get_s32); +MAKE_NLA_GET_DEFAULT(s64, nla_get_s64); +MAKE_NLA_GET_DEFAULT(s16, nla_get_le16); +MAKE_NLA_GET_DEFAULT(s32, nla_get_le32); +MAKE_NLA_GET_DEFAULT(s64, nla_get_le64); +MAKE_NLA_GET_DEFAULT(s16, nla_get_be16); +MAKE_NLA_GET_DEFAULT(s32, nla_get_be32); +MAKE_NLA_GET_DEFAULT(s64, nla_get_be64); + /** * nla_get_in_addr - return payload of IPv4 address attribute * @nla: IPv4 address netlink attribute