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crypto: arm64/aes-ghash - yield NEON after every block of input
Avoid excessive scheduling delays under a preemptible kernel by yielding the NEON after every block of input. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel
Herbert Xu
parent
20ab633258
commit
7c50136a8a
@ -213,22 +213,31 @@
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.endm
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.macro __pmull_ghash, pn
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ld1 {SHASH.2d}, [x3]
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ld1 {XL.2d}, [x1]
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frame_push 5
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mov x19, x0
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mov x20, x1
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mov x21, x2
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mov x22, x3
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mov x23, x4
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0: ld1 {SHASH.2d}, [x22]
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ld1 {XL.2d}, [x20]
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ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
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eor SHASH2.16b, SHASH2.16b, SHASH.16b
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__pmull_pre_\pn
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/* do the head block first, if supplied */
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cbz x4, 0f
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ld1 {T1.2d}, [x4]
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b 1f
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cbz x23, 1f
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ld1 {T1.2d}, [x23]
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mov x23, xzr
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b 2f
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0: ld1 {T1.2d}, [x2], #16
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sub w0, w0, #1
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1: ld1 {T1.2d}, [x21], #16
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sub w19, w19, #1
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1: /* multiply XL by SHASH in GF(2^128) */
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2: /* multiply XL by SHASH in GF(2^128) */
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CPU_LE( rev64 T1.16b, T1.16b )
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ext T2.16b, XL.16b, XL.16b, #8
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@ -250,9 +259,18 @@ CPU_LE( rev64 T1.16b, T1.16b )
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eor T2.16b, T2.16b, XH.16b
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eor XL.16b, XL.16b, T2.16b
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cbnz w0, 0b
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cbz w19, 3f
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st1 {XL.2d}, [x1]
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if_will_cond_yield_neon
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st1 {XL.2d}, [x20]
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do_cond_yield_neon
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b 0b
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endif_yield_neon
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b 1b
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3: st1 {XL.2d}, [x20]
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frame_pop
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ret
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.endm
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@ -304,38 +322,55 @@ ENDPROC(pmull_ghash_update_p8)
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.endm
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.macro pmull_gcm_do_crypt, enc
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ld1 {SHASH.2d}, [x4]
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ld1 {XL.2d}, [x1]
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ldr x8, [x5, #8] // load lower counter
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frame_push 10
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mov x19, x0
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mov x20, x1
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mov x21, x2
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mov x22, x3
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mov x23, x4
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mov x24, x5
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mov x25, x6
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mov x26, x7
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.if \enc == 1
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ldr x27, [sp, #96] // first stacked arg
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.endif
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ldr x28, [x24, #8] // load lower counter
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CPU_LE( rev x28, x28 )
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0: mov x0, x25
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load_round_keys w26, x0
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ld1 {SHASH.2d}, [x23]
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ld1 {XL.2d}, [x20]
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movi MASK.16b, #0xe1
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ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
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CPU_LE( rev x8, x8 )
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shl MASK.2d, MASK.2d, #57
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eor SHASH2.16b, SHASH2.16b, SHASH.16b
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.if \enc == 1
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ld1 {KS.16b}, [x7]
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ld1 {KS.16b}, [x27]
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.endif
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0: ld1 {CTR.8b}, [x5] // load upper counter
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ld1 {INP.16b}, [x3], #16
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rev x9, x8
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add x8, x8, #1
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sub w0, w0, #1
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1: ld1 {CTR.8b}, [x24] // load upper counter
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ld1 {INP.16b}, [x22], #16
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rev x9, x28
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add x28, x28, #1
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sub w19, w19, #1
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ins CTR.d[1], x9 // set lower counter
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.if \enc == 1
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eor INP.16b, INP.16b, KS.16b // encrypt input
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st1 {INP.16b}, [x2], #16
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st1 {INP.16b}, [x21], #16
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.endif
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rev64 T1.16b, INP.16b
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cmp w6, #12
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b.ge 2f // AES-192/256?
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cmp w26, #12
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b.ge 4f // AES-192/256?
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1: enc_round CTR, v21
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2: enc_round CTR, v21
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ext T2.16b, XL.16b, XL.16b, #8
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ext IN1.16b, T1.16b, T1.16b, #8
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@ -390,27 +425,39 @@ CPU_LE( rev x8, x8 )
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.if \enc == 0
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eor INP.16b, INP.16b, KS.16b
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st1 {INP.16b}, [x2], #16
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st1 {INP.16b}, [x21], #16
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.endif
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cbnz w0, 0b
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CPU_LE( rev x8, x8 )
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st1 {XL.2d}, [x1]
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str x8, [x5, #8] // store lower counter
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cbz w19, 3f
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if_will_cond_yield_neon
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st1 {XL.2d}, [x20]
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.if \enc == 1
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st1 {KS.16b}, [x7]
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st1 {KS.16b}, [x27]
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.endif
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do_cond_yield_neon
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b 0b
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endif_yield_neon
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b 1b
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3: st1 {XL.2d}, [x20]
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.if \enc == 1
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st1 {KS.16b}, [x27]
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.endif
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CPU_LE( rev x28, x28 )
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str x28, [x24, #8] // store lower counter
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frame_pop
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ret
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2: b.eq 3f // AES-192?
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4: b.eq 5f // AES-192?
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enc_round CTR, v17
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enc_round CTR, v18
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3: enc_round CTR, v19
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5: enc_round CTR, v19
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enc_round CTR, v20
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b 1b
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b 2b
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.endm
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/*
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@ -63,11 +63,12 @@ static void (*pmull_ghash_update)(int blocks, u64 dg[], const char *src,
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asmlinkage void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[],
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const u8 src[], struct ghash_key const *k,
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u8 ctr[], int rounds, u8 ks[]);
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u8 ctr[], u32 const rk[], int rounds,
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u8 ks[]);
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asmlinkage void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[],
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const u8 src[], struct ghash_key const *k,
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u8 ctr[], int rounds);
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u8 ctr[], u32 const rk[], int rounds);
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asmlinkage void pmull_gcm_encrypt_block(u8 dst[], u8 const src[],
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u32 const rk[], int rounds);
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@ -368,26 +369,29 @@ static int gcm_encrypt(struct aead_request *req)
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pmull_gcm_encrypt_block(ks, iv, NULL,
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num_rounds(&ctx->aes_key));
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put_unaligned_be32(3, iv + GCM_IV_SIZE);
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kernel_neon_end();
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err = skcipher_walk_aead_encrypt(&walk, req, true);
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err = skcipher_walk_aead_encrypt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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int blocks = walk.nbytes / AES_BLOCK_SIZE;
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kernel_neon_begin();
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pmull_gcm_encrypt(blocks, dg, walk.dst.virt.addr,
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walk.src.virt.addr, &ctx->ghash_key,
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iv, num_rounds(&ctx->aes_key), ks);
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iv, ctx->aes_key.key_enc,
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num_rounds(&ctx->aes_key), ks);
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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walk.nbytes % AES_BLOCK_SIZE);
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}
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kernel_neon_end();
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} else {
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__aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv,
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num_rounds(&ctx->aes_key));
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put_unaligned_be32(2, iv + GCM_IV_SIZE);
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err = skcipher_walk_aead_encrypt(&walk, req, true);
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err = skcipher_walk_aead_encrypt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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int blocks = walk.nbytes / AES_BLOCK_SIZE;
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@ -467,15 +471,19 @@ static int gcm_decrypt(struct aead_request *req)
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pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc,
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num_rounds(&ctx->aes_key));
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put_unaligned_be32(2, iv + GCM_IV_SIZE);
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kernel_neon_end();
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err = skcipher_walk_aead_decrypt(&walk, req, true);
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err = skcipher_walk_aead_decrypt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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int blocks = walk.nbytes / AES_BLOCK_SIZE;
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kernel_neon_begin();
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pmull_gcm_decrypt(blocks, dg, walk.dst.virt.addr,
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walk.src.virt.addr, &ctx->ghash_key,
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iv, num_rounds(&ctx->aes_key));
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iv, ctx->aes_key.key_enc,
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num_rounds(&ctx->aes_key));
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kernel_neon_end();
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err = skcipher_walk_done(&walk,
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walk.nbytes % AES_BLOCK_SIZE);
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@ -483,14 +491,12 @@ static int gcm_decrypt(struct aead_request *req)
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if (walk.nbytes)
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pmull_gcm_encrypt_block(iv, iv, NULL,
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num_rounds(&ctx->aes_key));
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kernel_neon_end();
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} else {
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__aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv,
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num_rounds(&ctx->aes_key));
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put_unaligned_be32(2, iv + GCM_IV_SIZE);
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err = skcipher_walk_aead_decrypt(&walk, req, true);
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err = skcipher_walk_aead_decrypt(&walk, req, false);
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while (walk.nbytes >= AES_BLOCK_SIZE) {
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int blocks = walk.nbytes / AES_BLOCK_SIZE;
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