Revision ab0fd1debe730ec9998678a0c53caefbd121ed10 authored by Tejun Heo on 03 July 2009, 10:56:18 UTC, committed by Jens Axboe on 03 July 2009, 19:06:45 UTC
Block layer used to merge requests and bios with different failfast settings. This caused regular IOs to fail prematurely when they were merged into failfast requests for readahead. Niel Lambrechts could trigger the problem semi-reliably on ext4 when resuming from STR. ext4 uses readahead when reading inodes and combined with the deterministic extra SATA PHY exception cycle during resume on the specific configuration, non-readahead inode read would fail causing ext4 errors. Please read the following thread for details. http://lkml.org/lkml/2009/5/23/21 This patch makes block layer reject merging if the failfast settings don't match. This is correct but likely to lower IO performance by preventing regular IOs from mingling into surrounding readahead requests. Changes to allow such mixed merges and handle errors correctly will be added later. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Niel Lambrechts <niel.lambrechts@gmail.com> Cc: Theodore Tso <tytso@mit.edu> Signed-off-by: Jens Axboe <axboe@carl.(none)>
1 parent b59e64d
gf128mul.c
/* gf128mul.c - GF(2^128) multiplication functions
*
* Copyright (c) 2003, Dr Brian Gladman, Worcester, UK.
* Copyright (c) 2006, Rik Snel <rsnel@cube.dyndns.org>
*
* Based on Dr Brian Gladman's (GPL'd) work published at
* http://gladman.plushost.co.uk/oldsite/cryptography_technology/index.php
* See the original copyright notice below.
*
* 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.
*/
/*
---------------------------------------------------------------------------
Copyright (c) 2003, Dr Brian Gladman, Worcester, UK. All rights reserved.
LICENSE TERMS
The free distribution and use of this software in both source and binary
form is allowed (with or without changes) provided that:
1. distributions of this source code include the above copyright
notice, this list of conditions and the following disclaimer;
2. distributions in binary form include the above copyright
notice, this list of conditions and the following disclaimer
in the documentation and/or other associated materials;
3. the copyright holder's name is not used to endorse products
built using this software without specific written permission.
ALTERNATIVELY, provided that this notice is retained in full, this product
may be distributed under the terms of the GNU General Public License (GPL),
in which case the provisions of the GPL apply INSTEAD OF those given above.
DISCLAIMER
This software is provided 'as is' with no explicit or implied warranties
in respect of its properties, including, but not limited to, correctness
and/or fitness for purpose.
---------------------------------------------------------------------------
Issue 31/01/2006
This file provides fast multiplication in GF(128) as required by several
cryptographic authentication modes
*/
#include <crypto/gf128mul.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#define gf128mul_dat(q) { \
q(0x00), q(0x01), q(0x02), q(0x03), q(0x04), q(0x05), q(0x06), q(0x07),\
q(0x08), q(0x09), q(0x0a), q(0x0b), q(0x0c), q(0x0d), q(0x0e), q(0x0f),\
q(0x10), q(0x11), q(0x12), q(0x13), q(0x14), q(0x15), q(0x16), q(0x17),\
q(0x18), q(0x19), q(0x1a), q(0x1b), q(0x1c), q(0x1d), q(0x1e), q(0x1f),\
q(0x20), q(0x21), q(0x22), q(0x23), q(0x24), q(0x25), q(0x26), q(0x27),\
q(0x28), q(0x29), q(0x2a), q(0x2b), q(0x2c), q(0x2d), q(0x2e), q(0x2f),\
q(0x30), q(0x31), q(0x32), q(0x33), q(0x34), q(0x35), q(0x36), q(0x37),\
q(0x38), q(0x39), q(0x3a), q(0x3b), q(0x3c), q(0x3d), q(0x3e), q(0x3f),\
q(0x40), q(0x41), q(0x42), q(0x43), q(0x44), q(0x45), q(0x46), q(0x47),\
q(0x48), q(0x49), q(0x4a), q(0x4b), q(0x4c), q(0x4d), q(0x4e), q(0x4f),\
q(0x50), q(0x51), q(0x52), q(0x53), q(0x54), q(0x55), q(0x56), q(0x57),\
q(0x58), q(0x59), q(0x5a), q(0x5b), q(0x5c), q(0x5d), q(0x5e), q(0x5f),\
q(0x60), q(0x61), q(0x62), q(0x63), q(0x64), q(0x65), q(0x66), q(0x67),\
q(0x68), q(0x69), q(0x6a), q(0x6b), q(0x6c), q(0x6d), q(0x6e), q(0x6f),\
q(0x70), q(0x71), q(0x72), q(0x73), q(0x74), q(0x75), q(0x76), q(0x77),\
q(0x78), q(0x79), q(0x7a), q(0x7b), q(0x7c), q(0x7d), q(0x7e), q(0x7f),\
q(0x80), q(0x81), q(0x82), q(0x83), q(0x84), q(0x85), q(0x86), q(0x87),\
q(0x88), q(0x89), q(0x8a), q(0x8b), q(0x8c), q(0x8d), q(0x8e), q(0x8f),\
q(0x90), q(0x91), q(0x92), q(0x93), q(0x94), q(0x95), q(0x96), q(0x97),\
q(0x98), q(0x99), q(0x9a), q(0x9b), q(0x9c), q(0x9d), q(0x9e), q(0x9f),\
q(0xa0), q(0xa1), q(0xa2), q(0xa3), q(0xa4), q(0xa5), q(0xa6), q(0xa7),\
q(0xa8), q(0xa9), q(0xaa), q(0xab), q(0xac), q(0xad), q(0xae), q(0xaf),\
q(0xb0), q(0xb1), q(0xb2), q(0xb3), q(0xb4), q(0xb5), q(0xb6), q(0xb7),\
q(0xb8), q(0xb9), q(0xba), q(0xbb), q(0xbc), q(0xbd), q(0xbe), q(0xbf),\
q(0xc0), q(0xc1), q(0xc2), q(0xc3), q(0xc4), q(0xc5), q(0xc6), q(0xc7),\
q(0xc8), q(0xc9), q(0xca), q(0xcb), q(0xcc), q(0xcd), q(0xce), q(0xcf),\
q(0xd0), q(0xd1), q(0xd2), q(0xd3), q(0xd4), q(0xd5), q(0xd6), q(0xd7),\
q(0xd8), q(0xd9), q(0xda), q(0xdb), q(0xdc), q(0xdd), q(0xde), q(0xdf),\
q(0xe0), q(0xe1), q(0xe2), q(0xe3), q(0xe4), q(0xe5), q(0xe6), q(0xe7),\
q(0xe8), q(0xe9), q(0xea), q(0xeb), q(0xec), q(0xed), q(0xee), q(0xef),\
q(0xf0), q(0xf1), q(0xf2), q(0xf3), q(0xf4), q(0xf5), q(0xf6), q(0xf7),\
q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) \
}
/* Given the value i in 0..255 as the byte overflow when a field element
in GHASH is multipled by x^8, this function will return the values that
are generated in the lo 16-bit word of the field value by applying the
modular polynomial. The values lo_byte and hi_byte are returned via the
macro xp_fun(lo_byte, hi_byte) so that the values can be assembled into
memory as required by a suitable definition of this macro operating on
the table above
*/
#define xx(p, q) 0x##p##q
#define xda_bbe(i) ( \
(i & 0x80 ? xx(43, 80) : 0) ^ (i & 0x40 ? xx(21, c0) : 0) ^ \
(i & 0x20 ? xx(10, e0) : 0) ^ (i & 0x10 ? xx(08, 70) : 0) ^ \
(i & 0x08 ? xx(04, 38) : 0) ^ (i & 0x04 ? xx(02, 1c) : 0) ^ \
(i & 0x02 ? xx(01, 0e) : 0) ^ (i & 0x01 ? xx(00, 87) : 0) \
)
#define xda_lle(i) ( \
(i & 0x80 ? xx(e1, 00) : 0) ^ (i & 0x40 ? xx(70, 80) : 0) ^ \
(i & 0x20 ? xx(38, 40) : 0) ^ (i & 0x10 ? xx(1c, 20) : 0) ^ \
(i & 0x08 ? xx(0e, 10) : 0) ^ (i & 0x04 ? xx(07, 08) : 0) ^ \
(i & 0x02 ? xx(03, 84) : 0) ^ (i & 0x01 ? xx(01, c2) : 0) \
)
static const u16 gf128mul_table_lle[256] = gf128mul_dat(xda_lle);
static const u16 gf128mul_table_bbe[256] = gf128mul_dat(xda_bbe);
/* These functions multiply a field element by x, by x^4 and by x^8
* in the polynomial field representation. It uses 32-bit word operations
* to gain speed but compensates for machine endianess and hence works
* correctly on both styles of machine.
*/
static void gf128mul_x_lle(be128 *r, const be128 *x)
{
u64 a = be64_to_cpu(x->a);
u64 b = be64_to_cpu(x->b);
u64 _tt = gf128mul_table_lle[(b << 7) & 0xff];
r->b = cpu_to_be64((b >> 1) | (a << 63));
r->a = cpu_to_be64((a >> 1) ^ (_tt << 48));
}
static void gf128mul_x_bbe(be128 *r, const be128 *x)
{
u64 a = be64_to_cpu(x->a);
u64 b = be64_to_cpu(x->b);
u64 _tt = gf128mul_table_bbe[a >> 63];
r->a = cpu_to_be64((a << 1) | (b >> 63));
r->b = cpu_to_be64((b << 1) ^ _tt);
}
void gf128mul_x_ble(be128 *r, const be128 *x)
{
u64 a = le64_to_cpu(x->a);
u64 b = le64_to_cpu(x->b);
u64 _tt = gf128mul_table_bbe[b >> 63];
r->a = cpu_to_le64((a << 1) ^ _tt);
r->b = cpu_to_le64((b << 1) | (a >> 63));
}
EXPORT_SYMBOL(gf128mul_x_ble);
static void gf128mul_x8_lle(be128 *x)
{
u64 a = be64_to_cpu(x->a);
u64 b = be64_to_cpu(x->b);
u64 _tt = gf128mul_table_lle[b & 0xff];
x->b = cpu_to_be64((b >> 8) | (a << 56));
x->a = cpu_to_be64((a >> 8) ^ (_tt << 48));
}
static void gf128mul_x8_bbe(be128 *x)
{
u64 a = be64_to_cpu(x->a);
u64 b = be64_to_cpu(x->b);
u64 _tt = gf128mul_table_bbe[a >> 56];
x->a = cpu_to_be64((a << 8) | (b >> 56));
x->b = cpu_to_be64((b << 8) ^ _tt);
}
void gf128mul_lle(be128 *r, const be128 *b)
{
be128 p[8];
int i;
p[0] = *r;
for (i = 0; i < 7; ++i)
gf128mul_x_lle(&p[i + 1], &p[i]);
memset(r, 0, sizeof(r));
for (i = 0;;) {
u8 ch = ((u8 *)b)[15 - i];
if (ch & 0x80)
be128_xor(r, r, &p[0]);
if (ch & 0x40)
be128_xor(r, r, &p[1]);
if (ch & 0x20)
be128_xor(r, r, &p[2]);
if (ch & 0x10)
be128_xor(r, r, &p[3]);
if (ch & 0x08)
be128_xor(r, r, &p[4]);
if (ch & 0x04)
be128_xor(r, r, &p[5]);
if (ch & 0x02)
be128_xor(r, r, &p[6]);
if (ch & 0x01)
be128_xor(r, r, &p[7]);
if (++i >= 16)
break;
gf128mul_x8_lle(r);
}
}
EXPORT_SYMBOL(gf128mul_lle);
void gf128mul_bbe(be128 *r, const be128 *b)
{
be128 p[8];
int i;
p[0] = *r;
for (i = 0; i < 7; ++i)
gf128mul_x_bbe(&p[i + 1], &p[i]);
memset(r, 0, sizeof(r));
for (i = 0;;) {
u8 ch = ((u8 *)b)[i];
if (ch & 0x80)
be128_xor(r, r, &p[7]);
if (ch & 0x40)
be128_xor(r, r, &p[6]);
if (ch & 0x20)
be128_xor(r, r, &p[5]);
if (ch & 0x10)
be128_xor(r, r, &p[4]);
if (ch & 0x08)
be128_xor(r, r, &p[3]);
if (ch & 0x04)
be128_xor(r, r, &p[2]);
if (ch & 0x02)
be128_xor(r, r, &p[1]);
if (ch & 0x01)
be128_xor(r, r, &p[0]);
if (++i >= 16)
break;
gf128mul_x8_bbe(r);
}
}
EXPORT_SYMBOL(gf128mul_bbe);
/* This version uses 64k bytes of table space.
A 16 byte buffer has to be multiplied by a 16 byte key
value in GF(128). If we consider a GF(128) value in
the buffer's lowest byte, we can construct a table of
the 256 16 byte values that result from the 256 values
of this byte. This requires 4096 bytes. But we also
need tables for each of the 16 higher bytes in the
buffer as well, which makes 64 kbytes in total.
*/
/* additional explanation
* t[0][BYTE] contains g*BYTE
* t[1][BYTE] contains g*x^8*BYTE
* ..
* t[15][BYTE] contains g*x^120*BYTE */
struct gf128mul_64k *gf128mul_init_64k_lle(const be128 *g)
{
struct gf128mul_64k *t;
int i, j, k;
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
goto out;
for (i = 0; i < 16; i++) {
t->t[i] = kzalloc(sizeof(*t->t[i]), GFP_KERNEL);
if (!t->t[i]) {
gf128mul_free_64k(t);
t = NULL;
goto out;
}
}
t->t[0]->t[128] = *g;
for (j = 64; j > 0; j >>= 1)
gf128mul_x_lle(&t->t[0]->t[j], &t->t[0]->t[j + j]);
for (i = 0;;) {
for (j = 2; j < 256; j += j)
for (k = 1; k < j; ++k)
be128_xor(&t->t[i]->t[j + k],
&t->t[i]->t[j], &t->t[i]->t[k]);
if (++i >= 16)
break;
for (j = 128; j > 0; j >>= 1) {
t->t[i]->t[j] = t->t[i - 1]->t[j];
gf128mul_x8_lle(&t->t[i]->t[j]);
}
}
out:
return t;
}
EXPORT_SYMBOL(gf128mul_init_64k_lle);
struct gf128mul_64k *gf128mul_init_64k_bbe(const be128 *g)
{
struct gf128mul_64k *t;
int i, j, k;
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
goto out;
for (i = 0; i < 16; i++) {
t->t[i] = kzalloc(sizeof(*t->t[i]), GFP_KERNEL);
if (!t->t[i]) {
gf128mul_free_64k(t);
t = NULL;
goto out;
}
}
t->t[0]->t[1] = *g;
for (j = 1; j <= 64; j <<= 1)
gf128mul_x_bbe(&t->t[0]->t[j + j], &t->t[0]->t[j]);
for (i = 0;;) {
for (j = 2; j < 256; j += j)
for (k = 1; k < j; ++k)
be128_xor(&t->t[i]->t[j + k],
&t->t[i]->t[j], &t->t[i]->t[k]);
if (++i >= 16)
break;
for (j = 128; j > 0; j >>= 1) {
t->t[i]->t[j] = t->t[i - 1]->t[j];
gf128mul_x8_bbe(&t->t[i]->t[j]);
}
}
out:
return t;
}
EXPORT_SYMBOL(gf128mul_init_64k_bbe);
void gf128mul_free_64k(struct gf128mul_64k *t)
{
int i;
for (i = 0; i < 16; i++)
kfree(t->t[i]);
kfree(t);
}
EXPORT_SYMBOL(gf128mul_free_64k);
void gf128mul_64k_lle(be128 *a, struct gf128mul_64k *t)
{
u8 *ap = (u8 *)a;
be128 r[1];
int i;
*r = t->t[0]->t[ap[0]];
for (i = 1; i < 16; ++i)
be128_xor(r, r, &t->t[i]->t[ap[i]]);
*a = *r;
}
EXPORT_SYMBOL(gf128mul_64k_lle);
void gf128mul_64k_bbe(be128 *a, struct gf128mul_64k *t)
{
u8 *ap = (u8 *)a;
be128 r[1];
int i;
*r = t->t[0]->t[ap[15]];
for (i = 1; i < 16; ++i)
be128_xor(r, r, &t->t[i]->t[ap[15 - i]]);
*a = *r;
}
EXPORT_SYMBOL(gf128mul_64k_bbe);
/* This version uses 4k bytes of table space.
A 16 byte buffer has to be multiplied by a 16 byte key
value in GF(128). If we consider a GF(128) value in a
single byte, we can construct a table of the 256 16 byte
values that result from the 256 values of this byte.
This requires 4096 bytes. If we take the highest byte in
the buffer and use this table to get the result, we then
have to multiply by x^120 to get the final value. For the
next highest byte the result has to be multiplied by x^112
and so on. But we can do this by accumulating the result
in an accumulator starting with the result for the top
byte. We repeatedly multiply the accumulator value by
x^8 and then add in (i.e. xor) the 16 bytes of the next
lower byte in the buffer, stopping when we reach the
lowest byte. This requires a 4096 byte table.
*/
struct gf128mul_4k *gf128mul_init_4k_lle(const be128 *g)
{
struct gf128mul_4k *t;
int j, k;
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
goto out;
t->t[128] = *g;
for (j = 64; j > 0; j >>= 1)
gf128mul_x_lle(&t->t[j], &t->t[j+j]);
for (j = 2; j < 256; j += j)
for (k = 1; k < j; ++k)
be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);
out:
return t;
}
EXPORT_SYMBOL(gf128mul_init_4k_lle);
struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g)
{
struct gf128mul_4k *t;
int j, k;
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
goto out;
t->t[1] = *g;
for (j = 1; j <= 64; j <<= 1)
gf128mul_x_bbe(&t->t[j + j], &t->t[j]);
for (j = 2; j < 256; j += j)
for (k = 1; k < j; ++k)
be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);
out:
return t;
}
EXPORT_SYMBOL(gf128mul_init_4k_bbe);
void gf128mul_4k_lle(be128 *a, struct gf128mul_4k *t)
{
u8 *ap = (u8 *)a;
be128 r[1];
int i = 15;
*r = t->t[ap[15]];
while (i--) {
gf128mul_x8_lle(r);
be128_xor(r, r, &t->t[ap[i]]);
}
*a = *r;
}
EXPORT_SYMBOL(gf128mul_4k_lle);
void gf128mul_4k_bbe(be128 *a, struct gf128mul_4k *t)
{
u8 *ap = (u8 *)a;
be128 r[1];
int i = 0;
*r = t->t[ap[0]];
while (++i < 16) {
gf128mul_x8_bbe(r);
be128_xor(r, r, &t->t[ap[i]]);
}
*a = *r;
}
EXPORT_SYMBOL(gf128mul_4k_bbe);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Functions for multiplying elements of GF(2^128)");
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