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Subject[PATCH 5/8] Replacing spinlocks by nx_copy_ctx on NX-AES-ECB
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-ecb.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/crypto/nx/nx-aes-ecb.c b/drivers/crypto/nx/nx-aes-ecb.c
index 85a8d23..fcf190c 100644
--- a/drivers/crypto/nx/nx-aes-ecb.c
+++ b/drivers/crypto/nx/nx-aes-ecb.c
@@ -70,15 +70,19 @@ static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
{
struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
- unsigned long irq_flags;
unsigned int processed = 0, to_process;
u32 max_sg_len;
int rc;

- 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;

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);

if (enc)
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
@@ -87,22 +91,22 @@ static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,

do {
to_process = min_t(u64, nbytes - processed,
- nx_ctx->ap->databytelen);
+ 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);

- rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,
+ rc = nx_build_sg_lists(&curr_nx_ctx, desc, dst, src, to_process,
processed, NULL);
if (rc)
goto out;

- 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;
@@ -115,7 +119,7 @@ static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
} while (processed < nbytes);

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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