This patch updates the nx-aes-ctr implementation to perform several
hyper calls if needed in order to always respect the length limits for
scatter/gather lists.
Two different limits are considered:
- "ibm,max-sg-len": maximum number of bytes of each scatter/gather
list.
- "ibm,max-sync-cop":
- The total number of bytes that a scatter/gather list can hold.
- The maximum number of elements that a scatter/gather list can have.
Reviewed-by: Joy Latten <jmlatten@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Marcelo Cerri <mhcerri@xxxxxxxxxxxxxxxxxx>
---
drivers/crypto/nx/nx-aes-ctr.c | 50 ++++++++++++++++++++++++++----------------
1 file changed, 31 insertions(+), 19 deletions(-)
diff --git a/drivers/crypto/nx/nx-aes-ctr.c b/drivers/crypto/nx/nx-aes-ctr.c
index 80dee8d..a37d009 100644
--- a/drivers/crypto/nx/nx-aes-ctr.c
+++ b/drivers/crypto/nx/nx-aes-ctr.c
@@ -89,33 +89,45 @@ static int ctr_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);
- if (nbytes > nx_ctx->ap->databytelen) {
- rc = -EINVAL;
- goto out;
- }
+ max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
+ nx_ctx->ap->sglen);
- rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes, 0,
- csbcpb->cpb.aes_ctr.iv);
- if (rc)
- goto out;
+ do {
+ to_process = min_t(u64, nbytes - processed,
+ 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);
- if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
- rc = -EINVAL;
- goto out;
- }
+ rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,
+ processed, csbcpb->cpb.aes_ctr.iv);
+ if (rc)
+ goto out;
- rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
- desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
- if (rc)
- goto out;
+ if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
+ rc = -EINVAL;
+ goto out;
+ }
- atomic_inc(&(nx_ctx->stats->aes_ops));
- atomic64_add(csbcpb->csb.processed_byte_count,
- &(nx_ctx->stats->aes_bytes));
+ rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
+ desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+ if (rc)
+ goto out;
+
+ memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
+
+ atomic_inc(&(nx_ctx->stats->aes_ops));
+ atomic64_add(csbcpb->csb.processed_byte_count,
+ &(nx_ctx->stats->aes_bytes));
+
+ processed += to_process;
+ } while (processed < nbytes);
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return rc;
--
1.7.12
--
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