kernel/linux.git/arch/powerpc/include/asm/checksum.h, branch linux-4.4.y

powerpc: add support for csum_add()

2015-08-08T03:59:19+00:00

The C version of csum_add() as defined in include/net/checksum.h gives the following assembly in ppc32: 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 and the following in ppc64: 0xc000000000001af8 <+0>: add r3,r3,r4 0xc000000000001afc <+4>: cmplw cr7,r3,r4 0xc000000000001b00 <+8>: mfcr r4 0xc000000000001b04 <+12>: rlwinm r4,r4,29,31,31 0xc000000000001b08 <+16>: add r3,r4,r3 0xc000000000001b0c <+20>: clrldi r3,r3,32 0xc000000000001b10 <+24>: blr include/net/checksum.h also offers the possibility to define an arch specific function. This patch provides a specific csum_add() inline function. Signed-off-by: Christophe Leroy Signed-off-by: Scott Wood

powerpc: put csum_tcpudp_magic inline

2015-08-08T03:59:19+00:00

csum_tcpudp_magic() is only a few instructions, and does modify really few registers. So it is not worth having it as a separate function and suffer function branching and saving of volatile registers. This patch makes it inline by use of the already existing csum_tcpudp_nofold() function. Signed-off-by: Christophe Leroy Signed-off-by: Scott Wood

powerpc: Use generic checksum code in little endian

2013-10-11T05:48:39+00:00

We need to fix some endian issues in our checksum code. For now just enable the generic checksum routines for little endian builds. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc: Add 64bit csum_and_copy_to_user

2010-09-02T04:07:30+00:00

This adds the equivalent of csum_and_copy_from_user for the receive side so we can copy and checksum in one pass. It is modelled on the generic checksum routine. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc: Optimise 64bit csum_partial_copy_generic and add csum_and_copy_from_user

2010-09-02T04:07:30+00:00

We use the same core loop as the new csum_partial, adding in the stores and exception handling code. To keep things simple we do all the exception fixup in csum_and_copy_from_user. This wrapper function is modelled on the generic checksum code and is careful to always calculate a complete checksum even if we only copied part of the data to userspace. To test this I forced checksumming on over loopback and ran socklib (a simple TCP benchmark). On a POWER6 575 throughput improved by 19% with this patch. If I forced both the sender and receiver onto the same cpu (with the hope of shifting the benchmark from being cache bandwidth limited to cpu limited), adding this patch improved performance by 55% Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt

powerpc: Move include files to arch/powerpc/include/asm

2008-08-04T02:02:00+00:00

from include/asm-powerpc. This is the result of a mkdir arch/powerpc/include/asm git mv include/asm-powerpc/* arch/powerpc/include/asm Followed by a few documentation/comment fixups and a couple of places where was being used explicitly. Of the latter only one was outside the arch code and it is a driver only built for powerpc. Signed-off-by: Stephen Rothwell Signed-off-by: Paul Mackerras