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crypto: aesni - fix counter overflow handling in "by8" variant 

The "by8" CTR AVX implementation fails to propperly handle counter
overflows. That was the reason it got disabled in commit 7da4b29d49
("crypto: aesni - disable "by8" AVX CTR optimization").

Fix the overflow handling by incrementing the counter block as a double
quad word, i.e. a 128 bit, and testing for overflows afterwards. We need
to use VPTEST to do so as VPADD* does not set the flags itself and
silently drops the carry bit.

As this change adds branches to the hot path, minor performance
regressions  might be a side effect. But, OTOH, we now have a conforming
implementation -- the preferable goal.

A tcrypt test on a SandyBridge system (i7-2620M) showed almost identical
numbers for the old and this version with differences within the noise
range. A dm-crypt test with the fixed version gave even slightly better
results for this version. So the performance impact might not be as big
as expected.

Tested-by: Romain Francoise <romain@orebokech.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mathias Krause 2014-09-28 22:23:59 +02:00 committed by Herbert Xu
parent 7a1ae9c0ce
commit 80dca4734b
1 changed files with 15 additions and 2 deletions
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17
arch/x86/crypto/aes_ctrby8_avx-x86_64.S
View File

@ -108,6 +108,10 @@
byteswap_const:
.octa 0x000102030405060708090A0B0C0D0E0F
ddq_low_msk:
.octa 0x0000000000000000FFFFFFFFFFFFFFFF
ddq_high_add_1:
.octa 0x00000000000000010000000000000000
ddq_add_1:
.octa 0x00000000000000000000000000000001
ddq_add_2:
@ -169,7 +173,12 @@ ddq_add_8:
.rept (by - 1)
club DDQ_DATA, i
club XDATA, i
vpaddd var_ddq_add(%rip), xcounter, var_xdata
vpaddq var_ddq_add(%rip), xcounter, var_xdata
vptest ddq_low_msk(%rip), var_xdata
jnz 1f
vpaddq ddq_high_add_1(%rip), var_xdata, var_xdata
vpaddq ddq_high_add_1(%rip), xcounter, xcounter
1:
vpshufb xbyteswap, var_xdata, var_xdata
.set i, (i +1)
.endr
@ -178,7 +187,11 @@ ddq_add_8:
vpxor xkey0, xdata0, xdata0
club DDQ_DATA, by
vpaddd var_ddq_add(%rip), xcounter, xcounter
vpaddq var_ddq_add(%rip), xcounter, xcounter
vptest ddq_low_msk(%rip), xcounter
jnz 1f
vpaddq ddq_high_add_1(%rip), xcounter, xcounter
1:
.set i, 1
.rept (by - 1)