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linux/arch/powerpc/lib/checksum_32.S

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powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
/*
* This file contains assembly-language implementations
* of IP-style 1's complement checksum routines.
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Severely hacked about by Paul Mackerras (paulus@cs.anu.edu.au).
*/
#include <linux/sys.h>
#include <asm/processor.h>
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
#include <asm/cache.h>
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
#include <asm/errno.h>
#include <asm/ppc_asm.h>
ppc: move exports to definitions Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-13 23:33:46 -05:00
#include <asm/export.h>
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
.text
/*
* computes the checksum of a memory block at buff, length len,
* and adds in "sum" (32-bit)
*
powerpc: optimise csum_partial() call when len is constant csum_partial is often called for small fixed length packets for which it is suboptimal to use the generic csum_partial() function. For instance, in my configuration, I got: * One place calling it with constant len 4 * Seven places calling it with constant len 8 * Three places calling it with constant len 14 * One place calling it with constant len 20 * One place calling it with constant len 24 * One place calling it with constant len 32 This patch renames csum_partial() to __csum_partial() and implements csum_partial() as a wrapper inline function which * uses csum_add() for small 16bits multiple constant length * uses ip_fast_csum() for other 32bits multiple constant * uses __csum_partial() in all other cases Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2016-03-07 18:44:37 +01:00
* __csum_partial(buff, len, sum)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
*/
powerpc: optimise csum_partial() call when len is constant csum_partial is often called for small fixed length packets for which it is suboptimal to use the generic csum_partial() function. For instance, in my configuration, I got: * One place calling it with constant len 4 * Seven places calling it with constant len 8 * Three places calling it with constant len 14 * One place calling it with constant len 20 * One place calling it with constant len 24 * One place calling it with constant len 32 This patch renames csum_partial() to __csum_partial() and implements csum_partial() as a wrapper inline function which * uses csum_add() for small 16bits multiple constant length * uses ip_fast_csum() for other 32bits multiple constant * uses __csum_partial() in all other cases Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2016-03-07 18:44:37 +01:00
_GLOBAL(__csum_partial)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
subi r3,r3,4
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
srawi. r6,r4,2 /* Divide len by 4 and also clear carry */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
beq 3f /* if we're doing < 4 bytes */
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
andi. r0,r3,2 /* Align buffer to longword boundary */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
beq+ 1f
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
lhz r0,4(r3) /* do 2 bytes to get aligned */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
subi r4,r4,2
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
addi r3,r3,2
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
srwi. r6,r4,2 /* # words to do */
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
adde r5,r5,r0
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
beq 3f
powerpc32: optimise csum_partial() loop On the 8xx, load latency is 2 cycles and taking branches also takes 2 cycles. So let's unroll the loop. This patch improves csum_partial() speed by around 10% on both: * 8xx (single issue processor with parallel execution) * 83xx (superscalar 6xx processor with dual instruction fetch and parallel execution) Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:32 +02:00
1: andi. r6,r6,3 /* Prepare to handle words 4 by 4 */
beq 21f
mtctr r6
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
2: lwzu r0,4(r3)
adde r5,r5,r0
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
bdnz 2b
powerpc32: optimise csum_partial() loop On the 8xx, load latency is 2 cycles and taking branches also takes 2 cycles. So let's unroll the loop. This patch improves csum_partial() speed by around 10% on both: * 8xx (single issue processor with parallel execution) * 83xx (superscalar 6xx processor with dual instruction fetch and parallel execution) Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:32 +02:00
21: srwi. r6,r4,4 /* # blocks of 4 words to do */
beq 3f
mtctr r6
22: lwz r0,4(r3)
lwz r6,8(r3)
lwz r7,12(r3)
lwzu r8,16(r3)
adde r5,r5,r0
adde r5,r5,r6
adde r5,r5,r7
adde r5,r5,r8
bdnz 22b
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
3: andi. r0,r4,2
beq+ 4f
lhz r0,4(r3)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
addi r3,r3,2
powerpc32: optimise a few instructions in csum_partial() r5 does contain the value to be updated, so lets use r5 all way long for that. It makes the code more readable. To avoid confusion, it is better to use adde instead of addc The first addition is useless. Its only purpose is to clear carry. As r4 is a signed int that is always positive, this can be done by using srawi instead of srwi Let's also remove the comment about bdnz having no overhead as it is not correct on all powerpc, at least on MPC8xx In the last part, in our situation, the remaining quantity of bytes to be proceeded is between 0 and 3. Therefore, we can base that part on the value of bit 31 and bit 30 of r4 instead of anding r4 with 3 then proceding on comparisons and substractions. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:29 +02:00
adde r5,r5,r0
4: andi. r0,r4,1
beq+ 5f
lbz r0,4(r3)
slwi r0,r0,8 /* Upper byte of word */
adde r5,r5,r0
5: addze r3,r5 /* add in final carry */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
blr
ppc: move exports to definitions Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-13 23:33:46 -05:00
EXPORT_SYMBOL(__csum_partial)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
/*
* Computes the checksum of a memory block at src, length len,
* and adds in "sum" (32-bit), while copying the block to dst.
* If an access exception occurs on src or dst, it stores -EFAULT
* to *src_err or *dst_err respectively, and (for an error on
* src) zeroes the rest of dst.
*
* csum_partial_copy_generic(src, dst, len, sum, src_err, dst_err)
*/
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
#define CSUM_COPY_16_BYTES_WITHEX(n) \
8 ## n ## 0: \
lwz r7,4(r4); \
8 ## n ## 1: \
lwz r8,8(r4); \
8 ## n ## 2: \
lwz r9,12(r4); \
8 ## n ## 3: \
lwzu r10,16(r4); \
8 ## n ## 4: \
stw r7,4(r6); \
adde r12,r12,r7; \
8 ## n ## 5: \
stw r8,8(r6); \
adde r12,r12,r8; \
8 ## n ## 6: \
stw r9,12(r6); \
adde r12,r12,r9; \
8 ## n ## 7: \
stwu r10,16(r6); \
adde r12,r12,r10
#define CSUM_COPY_16_BYTES_EXCODE(n) \
powerpc: EX_TABLE macro for exception tables This macro is taken from s390, and allows more flexibility in changing exception table format. mpe: Put it in ppc_asm.h and only define one version using stringinfy_in_c(). Add some empty definitions and headers to keep the selftests happy. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-10-13 16:42:53 +11:00
EX_TABLE(8 ## n ## 0b, src_error); \
EX_TABLE(8 ## n ## 1b, src_error); \
EX_TABLE(8 ## n ## 2b, src_error); \
EX_TABLE(8 ## n ## 3b, src_error); \
EX_TABLE(8 ## n ## 4b, dst_error); \
EX_TABLE(8 ## n ## 5b, dst_error); \
EX_TABLE(8 ## n ## 6b, dst_error); \
EX_TABLE(8 ## n ## 7b, dst_error);
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
.text
.stabs "arch/powerpc/lib/",N_SO,0,0,0f
.stabs "checksum_32.S",N_SO,0,0,0f
0:
CACHELINE_BYTES = L1_CACHE_BYTES
LG_CACHELINE_BYTES = L1_CACHE_SHIFT
CACHELINE_MASK = (L1_CACHE_BYTES-1)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
_GLOBAL(csum_partial_copy_generic)
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
stwu r1,-16(r1)
stw r7,12(r1)
stw r8,8(r1)
addic r12,r6,0
addi r6,r4,-4
neg r0,r4
addi r4,r3,-4
andi. r0,r0,CACHELINE_MASK /* # bytes to start of cache line */
powerpc/32: Fix again csum_partial_copy_generic() Commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") introduced a bug when destination address is odd and len is lower than cacheline size. In that case the resulting csum value doesn't have to be rotated one byte because the cache-aligned copy part is skipped so no alignment is performed. Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") Cc: stable@vger.kernel.org # v4.6+ Reported-by: Alessio Igor Bogani <alessio.bogani@elettra.eu> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Tested-by: Alessio Igor Bogani <alessio.bogani@elettra.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-08-26 16:45:13 +02:00
crset 4*cr7+eq
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
beq 58f
cmplw 0,r5,r0 /* is this more than total to do? */
blt 63f /* if not much to do */
powerpc/32: Fix again csum_partial_copy_generic() Commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") introduced a bug when destination address is odd and len is lower than cacheline size. In that case the resulting csum value doesn't have to be rotated one byte because the cache-aligned copy part is skipped so no alignment is performed. Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") Cc: stable@vger.kernel.org # v4.6+ Reported-by: Alessio Igor Bogani <alessio.bogani@elettra.eu> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Tested-by: Alessio Igor Bogani <alessio.bogani@elettra.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-08-26 16:45:13 +02:00
rlwinm r7,r6,3,0x8
rlwnm r12,r12,r7,0,31 /* odd destination address: rotate one byte */
cmplwi cr7,r7,0 /* is destination address even ? */
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
andi. r8,r0,3 /* get it word-aligned first */
mtctr r8
beq+ 61f
li r3,0
70: lbz r9,4(r4) /* do some bytes */
addi r4,r4,1
slwi r3,r3,8
rlwimi r3,r9,0,24,31
71: stb r9,4(r6)
addi r6,r6,1
bdnz 70b
adde r12,r12,r3
61: subf r5,r0,r5
srwi. r0,r0,2
mtctr r0
beq 58f
72: lwzu r9,4(r4) /* do some words */
adde r12,r12,r9
73: stwu r9,4(r6)
bdnz 72b
58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
clrlwi r5,r5,32-LG_CACHELINE_BYTES
li r11,4
beq 63f
/* Here we decide how far ahead to prefetch the source */
li r3,4
cmpwi r0,1
li r7,0
ble 114f
li r7,1
#if MAX_COPY_PREFETCH > 1
/* Heuristically, for large transfers we prefetch
MAX_COPY_PREFETCH cachelines ahead. For small transfers
we prefetch 1 cacheline ahead. */
cmpwi r0,MAX_COPY_PREFETCH
ble 112f
li r7,MAX_COPY_PREFETCH
112: mtctr r7
111: dcbt r3,r4
addi r3,r3,CACHELINE_BYTES
bdnz 111b
#else
dcbt r3,r4
addi r3,r3,CACHELINE_BYTES
#endif /* MAX_COPY_PREFETCH > 1 */
114: subf r8,r7,r0
mr r0,r7
mtctr r8
53: dcbt r3,r4
54: dcbz r11,r6
/* the main body of the cacheline loop */
CSUM_COPY_16_BYTES_WITHEX(0)
#if L1_CACHE_BYTES >= 32
CSUM_COPY_16_BYTES_WITHEX(1)
#if L1_CACHE_BYTES >= 64
CSUM_COPY_16_BYTES_WITHEX(2)
CSUM_COPY_16_BYTES_WITHEX(3)
#if L1_CACHE_BYTES >= 128
CSUM_COPY_16_BYTES_WITHEX(4)
CSUM_COPY_16_BYTES_WITHEX(5)
CSUM_COPY_16_BYTES_WITHEX(6)
CSUM_COPY_16_BYTES_WITHEX(7)
#endif
#endif
#endif
bdnz 53b
cmpwi r0,0
li r3,4
li r7,0
bne 114b
63: srwi. r0,r5,2
mtctr r0
beq 64f
30: lwzu r0,4(r4)
adde r12,r12,r0
31: stwu r0,4(r6)
bdnz 30b
64: andi. r0,r5,2
beq+ 65f
40: lhz r0,4(r4)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
addi r4,r4,2
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
41: sth r0,4(r6)
adde r12,r12,r0
addi r6,r6,2
65: andi. r0,r5,1
beq+ 66f
50: lbz r0,4(r4)
51: stb r0,4(r6)
slwi r0,r0,8
adde r12,r12,r0
66: addze r3,r12
addi r1,r1,16
beqlr+ cr7
powerpc/32: Fix csum_partial_copy_generic() Commit 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") introduced a bug when destination address is odd and initial csum is not null In that (rare) case the initial csum value has to be rotated one byte as well as the resulting value is This patch also fixes related comments Fixes: 7aef4136566b0 ("powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user()") Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-08-02 10:07:05 +02:00
rlwinm r3,r3,8,0,31 /* odd destination address: rotate one byte */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
blr
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
/* read fault */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
src_error:
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
lwz r7,12(r1)
addi r1,r1,16
cmpwi cr0,r7,0
beqlr
li r0,-EFAULT
stw r0,0(r7)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
blr
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
/* write fault */
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
dst_error:
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
lwz r8,8(r1)
addi r1,r1,16
cmpwi cr0,r8,0
beqlr
li r0,-EFAULT
stw r0,0(r8)
powerpc: Merge enough to start building in arch/powerpc. This creates the directory structure under arch/powerpc and a bunch of Kconfig files. It does a first-cut merge of arch/powerpc/mm, arch/powerpc/lib and arch/powerpc/platforms/powermac. This is enough to build a 32-bit powermac kernel with ARCH=powerpc. For now we are getting some unmerged files from arch/ppc/kernel and arch/ppc/syslib, or arch/ppc64/kernel. This makes some minor changes to files in those directories and files outside arch/powerpc. The boot directory is still not merged. That's going to be interesting. Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-09-26 16:04:21 +10:00
blr
powerpc: EX_TABLE macro for exception tables This macro is taken from s390, and allows more flexibility in changing exception table format. mpe: Put it in ppc_asm.h and only define one version using stringinfy_in_c(). Add some empty definitions and headers to keep the selftests happy. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-10-13 16:42:53 +11:00
EX_TABLE(70b, src_error);
EX_TABLE(71b, dst_error);
EX_TABLE(72b, src_error);
EX_TABLE(73b, dst_error);
EX_TABLE(54b, dst_error);
powerpc32: rewrite csum_partial_copy_generic() based on copy_tofrom_user() csum_partial_copy_generic() does the same as copy_tofrom_user and also calculates the checksum during the copy. Unlike copy_tofrom_user(), the existing version of csum_partial_copy_generic() doesn't take benefit of the cache. This patch is a rewrite of csum_partial_copy_generic() based on copy_tofrom_user(). The previous version of csum_partial_copy_generic() was handling errors. Now we have the checksum wrapper functions to handle the error case like in powerpc64 so we can make the error case simple: just return -EFAULT. copy_tofrom_user() only has r12 available => we use it for the checksum r7 and r8 which contains pointers to error feedback are used, so we stack them. On a TCP benchmark using socklib on the loopback interface on which checksum offload and scatter/gather have been deactivated, we get about 20% performance increase. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
2015-09-22 16:34:27 +02:00
/*
* this stuff handles faults in the cacheline loop and branches to either
* src_error (if in read part) or dst_error (if in write part)
*/
CSUM_COPY_16_BYTES_EXCODE(0)
#if L1_CACHE_BYTES >= 32
CSUM_COPY_16_BYTES_EXCODE(1)
#if L1_CACHE_BYTES >= 64
CSUM_COPY_16_BYTES_EXCODE(2)
CSUM_COPY_16_BYTES_EXCODE(3)
#if L1_CACHE_BYTES >= 128
CSUM_COPY_16_BYTES_EXCODE(4)
CSUM_COPY_16_BYTES_EXCODE(5)
CSUM_COPY_16_BYTES_EXCODE(6)
CSUM_COPY_16_BYTES_EXCODE(7)
#endif
#endif
#endif
powerpc: EX_TABLE macro for exception tables This macro is taken from s390, and allows more flexibility in changing exception table format. mpe: Put it in ppc_asm.h and only define one version using stringinfy_in_c(). Add some empty definitions and headers to keep the selftests happy. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-10-13 16:42:53 +11:00
EX_TABLE(30b, src_error);
EX_TABLE(31b, dst_error);
EX_TABLE(40b, src_error);
EX_TABLE(41b, dst_error);
EX_TABLE(50b, src_error);
EX_TABLE(51b, dst_error);
ppc: move exports to definitions Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-13 23:33:46 -05:00
EXPORT_SYMBOL(csum_partial_copy_generic)
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