From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailhub1.si.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by lists.ozlabs.org (Postfix) with ESMTP id 888741A08B3 for ; Fri, 19 Sep 2014 23:57:59 +1000 (EST) From: Christophe Leroy To: Benjamin Herrenschmidt , Paul Mackerras , scottwood@freescale.com Subject: [PATCH 2/2] powerpc32: add support for csum_add() Message-Id: <20140919135756.A060D1AB26D@localhost.localdomain> Date: Fri, 19 Sep 2014 15:57:56 +0200 (CEST) Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The C version of csum_add() as defined in include/net/checksum.h gives the following assembly: 0: 7c 04 1a 14 add r0,r4,r3 4: 7c 64 00 10 subfc r3,r4,r0 8: 7c 63 19 10 subfe r3,r3,r3 c: 7c 63 00 50 subf r3,r3,r0 include/net/checksum.h also offers the possibility to define an arch specific function. This patch provides a ppc32 specific csum_add() inline function. Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/checksum.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h index cfe806a..a13aa1f 100644 --- a/arch/powerpc/include/asm/checksum.h +++ b/arch/powerpc/include/asm/checksum.h @@ -141,6 +141,19 @@ static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, { return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); } + +#define HAVE_ARCH_CSUM_ADD +static inline __wsum csum_add(__wsum csum, __wsum addend) +{ + __asm__("\n\ + addc %0,%0,%1 \n\ + addze %0,%0 \n\ + " + : "=r" (csum) + : "r" (addend), "0"(csum)); + return csum; +} + #endif #endif #endif /* __KERNEL__ */ -- 2.1.0