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crypto: arm/crct10dif - Macroify PMULL asm code
To allow an alternative version to be created of the PMULL based CRC-T10DIF algorithm, turn the bulk of it into a macro, except for the final reduction, which will only be used by the existing version. Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
fcf27785ae
commit
802d8d110c
@ -112,48 +112,42 @@
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FOLD_CONST_L .req q10l
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FOLD_CONST_H .req q10h
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.macro pmull16x64_p64, v16, v64
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vmull.p64 q11, \v64\()l, \v16\()_L
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vmull.p64 \v64, \v64\()h, \v16\()_H
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veor \v64, \v64, q11
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.endm
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// Fold reg1, reg2 into the next 32 data bytes, storing the result back
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// into reg1, reg2.
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.macro fold_32_bytes, reg1, reg2
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vld1.64 {q11-q12}, [buf]!
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.macro fold_32_bytes, reg1, reg2, p
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vld1.64 {q8-q9}, [buf]!
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vmull.p64 q8, \reg1\()h, FOLD_CONST_H
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vmull.p64 \reg1, \reg1\()l, FOLD_CONST_L
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vmull.p64 q9, \reg2\()h, FOLD_CONST_H
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vmull.p64 \reg2, \reg2\()l, FOLD_CONST_L
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pmull16x64_\p FOLD_CONST, \reg1
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pmull16x64_\p FOLD_CONST, \reg2
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CPU_LE( vrev64.8 q11, q11 )
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CPU_LE( vrev64.8 q12, q12 )
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vswp q11l, q11h
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vswp q12l, q12h
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CPU_LE( vrev64.8 q8, q8 )
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CPU_LE( vrev64.8 q9, q9 )
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vswp q8l, q8h
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vswp q9l, q9h
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veor.8 \reg1, \reg1, q8
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veor.8 \reg2, \reg2, q9
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veor.8 \reg1, \reg1, q11
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veor.8 \reg2, \reg2, q12
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.endm
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// Fold src_reg into dst_reg, optionally loading the next fold constants
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.macro fold_16_bytes, src_reg, dst_reg, load_next_consts
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vmull.p64 q8, \src_reg\()l, FOLD_CONST_L
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vmull.p64 \src_reg, \src_reg\()h, FOLD_CONST_H
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.macro fold_16_bytes, src_reg, dst_reg, p, load_next_consts
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pmull16x64_\p FOLD_CONST, \src_reg
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.ifnb \load_next_consts
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vld1.64 {FOLD_CONSTS}, [fold_consts_ptr, :128]!
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.endif
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veor.8 \dst_reg, \dst_reg, q8
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veor.8 \dst_reg, \dst_reg, \src_reg
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.endm
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//
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// u16 crc_t10dif_pmull(u16 init_crc, const u8 *buf, size_t len);
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//
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// Assumes len >= 16.
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//
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ENTRY(crc_t10dif_pmull)
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.macro crct10dif, p
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// For sizes less than 256 bytes, we can't fold 128 bytes at a time.
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cmp len, #256
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blt .Lless_than_256_bytes
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blt .Lless_than_256_bytes\@
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mov_l fold_consts_ptr, .Lfold_across_128_bytes_consts
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@ -194,27 +188,27 @@ CPU_LE( vrev64.8 q7, q7 )
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// While >= 128 data bytes remain (not counting q0-q7), fold the 128
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// bytes q0-q7 into them, storing the result back into q0-q7.
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.Lfold_128_bytes_loop:
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fold_32_bytes q0, q1
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fold_32_bytes q2, q3
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fold_32_bytes q4, q5
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fold_32_bytes q6, q7
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.Lfold_128_bytes_loop\@:
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fold_32_bytes q0, q1, \p
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fold_32_bytes q2, q3, \p
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fold_32_bytes q4, q5, \p
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fold_32_bytes q6, q7, \p
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subs len, len, #128
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bge .Lfold_128_bytes_loop
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bge .Lfold_128_bytes_loop\@
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// Now fold the 112 bytes in q0-q6 into the 16 bytes in q7.
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// Fold across 64 bytes.
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vld1.64 {FOLD_CONSTS}, [fold_consts_ptr, :128]!
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fold_16_bytes q0, q4
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fold_16_bytes q1, q5
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fold_16_bytes q2, q6
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fold_16_bytes q3, q7, 1
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fold_16_bytes q0, q4, \p
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fold_16_bytes q1, q5, \p
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fold_16_bytes q2, q6, \p
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fold_16_bytes q3, q7, \p, 1
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// Fold across 32 bytes.
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fold_16_bytes q4, q6
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fold_16_bytes q5, q7, 1
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fold_16_bytes q4, q6, \p
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fold_16_bytes q5, q7, \p, 1
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// Fold across 16 bytes.
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fold_16_bytes q6, q7
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fold_16_bytes q6, q7, \p
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// Add 128 to get the correct number of data bytes remaining in 0...127
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// (not counting q7), following the previous extra subtraction by 128.
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@ -224,25 +218,23 @@ CPU_LE( vrev64.8 q7, q7 )
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// While >= 16 data bytes remain (not counting q7), fold the 16 bytes q7
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// into them, storing the result back into q7.
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blt .Lfold_16_bytes_loop_done
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.Lfold_16_bytes_loop:
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vmull.p64 q8, q7l, FOLD_CONST_L
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vmull.p64 q7, q7h, FOLD_CONST_H
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veor.8 q7, q7, q8
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blt .Lfold_16_bytes_loop_done\@
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.Lfold_16_bytes_loop\@:
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pmull16x64_\p FOLD_CONST, q7
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vld1.64 {q0}, [buf]!
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CPU_LE( vrev64.8 q0, q0 )
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vswp q0l, q0h
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veor.8 q7, q7, q0
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subs len, len, #16
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bge .Lfold_16_bytes_loop
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bge .Lfold_16_bytes_loop\@
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.Lfold_16_bytes_loop_done:
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.Lfold_16_bytes_loop_done\@:
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// Add 16 to get the correct number of data bytes remaining in 0...15
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// (not counting q7), following the previous extra subtraction by 16.
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adds len, len, #16
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beq .Lreduce_final_16_bytes
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beq .Lreduce_final_16_bytes\@
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.Lhandle_partial_segment:
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.Lhandle_partial_segment\@:
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// Reduce the last '16 + len' bytes where 1 <= len <= 15 and the first
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// 16 bytes are in q7 and the rest are the remaining data in 'buf'. To
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// do this without needing a fold constant for each possible 'len',
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@ -277,12 +269,46 @@ CPU_LE( vrev64.8 q0, q0 )
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vbsl.8 q2, q1, q0
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// Fold the first chunk into the second chunk, storing the result in q7.
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vmull.p64 q0, q3l, FOLD_CONST_L
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vmull.p64 q7, q3h, FOLD_CONST_H
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veor.8 q7, q7, q0
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veor.8 q7, q7, q2
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pmull16x64_\p FOLD_CONST, q3
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veor.8 q7, q3, q2
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b .Lreduce_final_16_bytes\@
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.Lless_than_256_bytes\@:
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// Checksumming a buffer of length 16...255 bytes
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mov_l fold_consts_ptr, .Lfold_across_16_bytes_consts
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// Load the first 16 data bytes.
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vld1.64 {q7}, [buf]!
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CPU_LE( vrev64.8 q7, q7 )
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vswp q7l, q7h
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// XOR the first 16 data *bits* with the initial CRC value.
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vmov.i8 q0h, #0
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vmov.u16 q0h[3], init_crc
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veor.8 q7h, q7h, q0h
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// Load the fold-across-16-bytes constants.
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vld1.64 {FOLD_CONSTS}, [fold_consts_ptr, :128]!
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cmp len, #16
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beq .Lreduce_final_16_bytes\@ // len == 16
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subs len, len, #32
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addlt len, len, #16
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blt .Lhandle_partial_segment\@ // 17 <= len <= 31
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b .Lfold_16_bytes_loop\@ // 32 <= len <= 255
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.Lreduce_final_16_bytes\@:
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.endm
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//
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// u16 crc_t10dif_pmull(u16 init_crc, const u8 *buf, size_t len);
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//
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// Assumes len >= 16.
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//
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ENTRY(crc_t10dif_pmull64)
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crct10dif p64
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.Lreduce_final_16_bytes:
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// Reduce the 128-bit value M(x), stored in q7, to the final 16-bit CRC.
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// Load 'x^48 * (x^48 mod G(x))' and 'x^48 * (x^80 mod G(x))'.
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@ -316,31 +342,7 @@ CPU_LE( vrev64.8 q0, q0 )
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vmov.u16 r0, q0l[0]
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bx lr
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.Lless_than_256_bytes:
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// Checksumming a buffer of length 16...255 bytes
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mov_l fold_consts_ptr, .Lfold_across_16_bytes_consts
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// Load the first 16 data bytes.
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vld1.64 {q7}, [buf]!
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CPU_LE( vrev64.8 q7, q7 )
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vswp q7l, q7h
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// XOR the first 16 data *bits* with the initial CRC value.
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vmov.i8 q0h, #0
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vmov.u16 q0h[3], init_crc
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veor.8 q7h, q7h, q0h
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// Load the fold-across-16-bytes constants.
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vld1.64 {FOLD_CONSTS}, [fold_consts_ptr, :128]!
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cmp len, #16
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beq .Lreduce_final_16_bytes // len == 16
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subs len, len, #32
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addlt len, len, #16
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blt .Lhandle_partial_segment // 17 <= len <= 31
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b .Lfold_16_bytes_loop // 32 <= len <= 255
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ENDPROC(crc_t10dif_pmull)
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ENDPROC(crc_t10dif_pmull64)
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.section ".rodata", "a"
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.align 4
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@ -19,7 +19,7 @@
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#define CRC_T10DIF_PMULL_CHUNK_SIZE 16U
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asmlinkage u16 crc_t10dif_pmull(u16 init_crc, const u8 *buf, size_t len);
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asmlinkage u16 crc_t10dif_pmull64(u16 init_crc, const u8 *buf, size_t len);
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static int crct10dif_init(struct shash_desc *desc)
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{
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@ -29,14 +29,14 @@ static int crct10dif_init(struct shash_desc *desc)
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return 0;
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}
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static int crct10dif_update(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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static int crct10dif_update_ce(struct shash_desc *desc, const u8 *data,
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unsigned int length)
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{
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u16 *crc = shash_desc_ctx(desc);
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if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
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kernel_neon_begin();
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*crc = crc_t10dif_pmull(*crc, data, length);
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*crc = crc_t10dif_pmull64(*crc, data, length);
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kernel_neon_end();
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} else {
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*crc = crc_t10dif_generic(*crc, data, length);
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@ -56,7 +56,7 @@ static int crct10dif_final(struct shash_desc *desc, u8 *out)
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static struct shash_alg crc_t10dif_alg = {
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.digestsize = CRC_T10DIF_DIGEST_SIZE,
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.init = crct10dif_init,
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.update = crct10dif_update,
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.update = crct10dif_update_ce,
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.final = crct10dif_final,
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.descsize = CRC_T10DIF_DIGEST_SIZE,
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