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Subject[PATCH 7/8] Replacing spinlocks by nx_copy_ctx on NX-AES-XCBC
Replaces spinlock usage by a simple copy of the crypto context, avoiding
possible bottlenecks.

Signed-off-by: Leonidas Da Silva Barbosa <leosilva@linux.vnet.ibm.com>
---
drivers/crypto/nx/nx-aes-xcbc.c | 51 ++++++++++++++++++++++----------------
1 files changed, 29 insertions(+), 22 deletions(-)

diff --git a/drivers/crypto/nx/nx-aes-xcbc.c b/drivers/crypto/nx/nx-aes-xcbc.c
index 03c4bf5..d8a5bdb 100644
--- a/drivers/crypto/nx/nx-aes-xcbc.c
+++ b/drivers/crypto/nx/nx-aes-xcbc.c
@@ -161,11 +161,14 @@ static int nx_xcbc_update(struct shash_desc *desc,
struct nx_sg *in_sg;
u32 to_process, leftover, total;
u32 max_sg_len;
- unsigned long irq_flags;
int rc = 0;

- spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+ struct nx_crypto_ctx curr_nx_ctx;

+ if (nx_copy_ctx(&curr_nx_ctx, nx_ctx))
+ return -ENOMEM;
+
+ csbcpb = curr_nx_ctx.csbcpb;

total = sctx->count + len;

@@ -179,15 +182,15 @@ static int nx_xcbc_update(struct shash_desc *desc,
goto out;
}

- in_sg = nx_ctx->in_sg;
+ in_sg = curr_nx_ctx.in_sg;
max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
- nx_ctx->ap->sglen);
+ curr_nx_ctx.ap->sglen);

do {

/* to_process: the AES_BLOCK_SIZE data chunk to process in this
* update */
- to_process = min_t(u64, total, nx_ctx->ap->databytelen);
+ to_process = min_t(u64, total, curr_nx_ctx.ap->databytelen);
to_process = min_t(u64, to_process,
NX_PAGE_SIZE * (max_sg_len - 1));
to_process = to_process & ~(AES_BLOCK_SIZE - 1);
@@ -204,7 +207,7 @@ static int nx_xcbc_update(struct shash_desc *desc,
}

if (sctx->count) {
- in_sg = nx_build_sg_list(nx_ctx->in_sg,
+ in_sg = nx_build_sg_list(curr_nx_ctx.in_sg,
(u8 *) sctx->buffer,
sctx->count,
max_sg_len);
@@ -213,7 +216,7 @@ static int nx_xcbc_update(struct shash_desc *desc,
(u8 *) data,
to_process - sctx->count,
max_sg_len);
- nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
+ nx_ctx->op.inlen = (curr_nx_ctx.in_sg - in_sg) *
sizeof(struct nx_sg);

/* we've hit the nx chip previously and we're updating again,
@@ -225,12 +228,12 @@ static int nx_xcbc_update(struct shash_desc *desc,
}

NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
- if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
+ if (!curr_nx_ctx.op.inlen || !curr_nx_ctx.op.outlen) {
rc = -EINVAL;
goto out;
}

- rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
+ rc = nx_hcall_sync(&curr_nx_ctx, &curr_nx_ctx.op,
desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
@@ -243,7 +246,7 @@ static int nx_xcbc_update(struct shash_desc *desc,
total -= to_process;
data += to_process - sctx->count;
sctx->count = 0;
- in_sg = nx_ctx->in_sg;
+ in_sg = curr_nx_ctx.in_sg;
} while (leftover > AES_BLOCK_SIZE);

/* copy the leftover back into the state struct */
@@ -251,7 +254,7 @@ static int nx_xcbc_update(struct shash_desc *desc,
sctx->count = leftover;

out:
- spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
+ kmem_cache_free(nx_driver.slab, curr_nx_ctx.kmem);
return rc;
}

@@ -261,10 +264,14 @@ static int nx_xcbc_final(struct shash_desc *desc, u8 *out)
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
struct nx_sg *in_sg, *out_sg;
- unsigned long irq_flags;
int rc = 0;

- spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+ struct nx_crypto_ctx curr_nx_ctx;
+
+ if (nx_copy_ctx(&curr_nx_ctx, nx_ctx))
+ return -ENOMEM;
+
+ csbcpb = curr_nx_ctx.csbcpb;

if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
/* we've hit the nx chip previously, now we're finalizing,
@@ -285,20 +292,20 @@ static int nx_xcbc_final(struct shash_desc *desc, u8 *out)
* this is not an intermediate operation */
NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE;

- in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)sctx->buffer,
- sctx->count, nx_ctx->ap->sglen);
- out_sg = nx_build_sg_list(nx_ctx->out_sg, out, AES_BLOCK_SIZE,
- nx_ctx->ap->sglen);
+ in_sg = nx_build_sg_list(curr_nx_ctx.in_sg, (u8 *)sctx->buffer,
+ sctx->count, curr_nx_ctx.ap->sglen);
+ out_sg = nx_build_sg_list(curr_nx_ctx.out_sg, out, AES_BLOCK_SIZE,
+ curr_nx_ctx.ap->sglen);

- nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg);
- nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
+ curr_nx_ctx.op.inlen = (curr_nx_ctx.in_sg - in_sg) * sizeof(struct nx_sg);
+ curr_nx_ctx.op.outlen = (curr_nx_ctx.out_sg - out_sg) * sizeof(struct nx_sg);

- if (!nx_ctx->op.outlen) {
+ if (!curr_nx_ctx.op.outlen) {
rc = -EINVAL;
goto out;
}

- rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
+ rc = nx_hcall_sync(&curr_nx_ctx, &curr_nx_ctx.op,
desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
@@ -307,7 +314,7 @@ static int nx_xcbc_final(struct shash_desc *desc, u8 *out)

memcpy(out, csbcpb->cpb.aes_xcbc.out_cv_mac, AES_BLOCK_SIZE);
out:
- spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
+ kmem_cache_free(nx_driver.slab, curr_nx_ctx.kmem);
return rc;
}

--
1.7.1


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