From patchwork Sat Oct 26 12:53:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Puranjay Mohan X-Patchwork-Id: 13852221 X-Patchwork-Delegate: bpf@iogearbox.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1CFEB1D6DBF; Sat, 26 Oct 2024 12:54:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729947250; cv=none; b=SDdLwB7oyYIf3XhehYVWm9NpuF2duFYGBBXhaZavOdNPDp9V5K1ESiX7YmiaOobWN7zAhbkHI1EAeNcaObgWbEP6xJQmrWj/YU2nE1+3F2s76f46uzWLdG9j69rjoIsA8N000wmq00nx5jPGC8535pk94sD/VKNGrhslzqLmZlI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729947250; c=relaxed/simple; bh=ewTQi8vvMjY2tDN+rwCGUkIKwCDc2H1+fYWUrCoOJYU=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=ncgHk06cV58p4AnL3/HjEa+igmtDt+/svlXR3F6KY9YA5UVtyXu6J1gYmo4njYAwX9EaFIGMKo45A+5zvVYdCOifw2IU7B+mT1HPTQHOCPNoaZ+ejhtz2IkOsiKiZ1huYPy2tLWIgDGsr7qX7txFrqbTp8OZxL6fTe/3TyBNk/o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WbAamJzl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WbAamJzl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CAC0C4CEC6; Sat, 26 Oct 2024 12:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729947249; bh=ewTQi8vvMjY2tDN+rwCGUkIKwCDc2H1+fYWUrCoOJYU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=WbAamJzlwTxPsjFngruaSdwNUN8no6/j4LEN5OV4dI/QGgP/6trmtHB3MO+Zvmjsw 8froMnzAAN+MGW+Tx65nSRHajrYxCHL+sG/EpvlUSG9+KTvDONQtLqJBzhKnQU5Qp8 fco5pc+WYDFq/9afUOsapsPzVlJ39aywhnrVX/w94J6krs5ELKACKwbsL6y29AMyJo XbtP5ym70corM9xx9gJoy3zbbJGNlMgrtYY4I67x/vgGqs7DZg1qJLhLFG7afLdJFP GXahRnyftxP7M8goAMPSD3m/7ehtyiolzjvOklrfB0eCYtlebr5J3tvjTO81ulzdOt Xi0kjKXwh634Q== From: Puranjay Mohan To: Albert Ou , Alexei Starovoitov , Andrew Morton , Andrii Nakryiko , bpf@vger.kernel.org, Daniel Borkmann , "David S. Miller" , Eduard Zingerman , Eric Dumazet , Hao Luo , Helge Deller , Jakub Kicinski , "James E.J. Bottomley" , Jiri Olsa , John Fastabend , KP Singh , linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, Martin KaFai Lau , Mykola Lysenko , netdev@vger.kernel.org, Palmer Dabbelt , Paolo Abeni , Paul Walmsley , Puranjay Mohan , Puranjay Mohan , Shuah Khan , Song Liu , Stanislav Fomichev , Yonghong Song Subject: [PATCH bpf-next v3 1/4] net: checksum: move from32to16() to generic header Date: Sat, 26 Oct 2024 12:53:36 +0000 Message-Id: <20241026125339.26459-2-puranjay@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20241026125339.26459-1-puranjay@kernel.org> References: <20241026125339.26459-1-puranjay@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net from32to16() is used by lib/checksum.c and also by arch/parisc/lib/checksum.c. The next patch will use it in the bpf_csum_diff helper. Move from32to16() to the include/net/checksum.h as csum_from32to16() and remove other implementations. Signed-off-by: Puranjay Mohan Acked-by: Daniel Borkmann Reviewed-by: Toke Høiland-Jørgensen --- arch/parisc/lib/checksum.c | 13 ++----------- include/net/checksum.h | 6 ++++++ lib/checksum.c | 11 +---------- 3 files changed, 9 insertions(+), 21 deletions(-) diff --git a/arch/parisc/lib/checksum.c b/arch/parisc/lib/checksum.c index 4818f3db84a5c..59d8c15d81bd0 100644 --- a/arch/parisc/lib/checksum.c +++ b/arch/parisc/lib/checksum.c @@ -25,15 +25,6 @@ : "=r"(_t) \ : "r"(_r), "0"(_t)); -static inline unsigned short from32to16(unsigned int x) -{ - /* 32 bits --> 16 bits + carry */ - x = (x & 0xffff) + (x >> 16); - /* 16 bits + carry --> 16 bits including carry */ - x = (x & 0xffff) + (x >> 16); - return (unsigned short)x; -} - static inline unsigned int do_csum(const unsigned char * buff, int len) { int odd, count; @@ -85,7 +76,7 @@ static inline unsigned int do_csum(const unsigned char * buff, int len) } if (len & 1) result += le16_to_cpu(*buff); - result = from32to16(result); + result = csum_from32to16(result); if (odd) result = swab16(result); out: @@ -102,7 +93,7 @@ __wsum csum_partial(const void *buff, int len, __wsum sum) { unsigned int result = do_csum(buff, len); addc(result, sum); - return (__force __wsum)from32to16(result); + return (__force __wsum)csum_from32to16(result); } EXPORT_SYMBOL(csum_partial); diff --git a/include/net/checksum.h b/include/net/checksum.h index 1338cb92c8e72..243f972267b8d 100644 --- a/include/net/checksum.h +++ b/include/net/checksum.h @@ -151,6 +151,12 @@ static inline void csum_replace(__wsum *csum, __wsum old, __wsum new) *csum = csum_add(csum_sub(*csum, old), new); } +static inline unsigned short csum_from32to16(unsigned int sum) +{ + sum += (sum >> 16) | (sum << 16); + return (unsigned short)(sum >> 16); +} + struct sk_buff; void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, __be32 from, __be32 to, bool pseudohdr); diff --git a/lib/checksum.c b/lib/checksum.c index 6860d6b05a171..025ba546e1ec6 100644 --- a/lib/checksum.c +++ b/lib/checksum.c @@ -34,15 +34,6 @@ #include #ifndef do_csum -static inline unsigned short from32to16(unsigned int x) -{ - /* add up 16-bit and 16-bit for 16+c bit */ - x = (x & 0xffff) + (x >> 16); - /* add up carry.. */ - x = (x & 0xffff) + (x >> 16); - return x; -} - static unsigned int do_csum(const unsigned char *buff, int len) { int odd; @@ -90,7 +81,7 @@ static unsigned int do_csum(const unsigned char *buff, int len) #else result += (*buff << 8); #endif - result = from32to16(result); + result = csum_from32to16(result); if (odd) result = ((result >> 8) & 0xff) | ((result & 0xff) << 8); out: