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crypto: nx - fix limits to sg lists for AES-XCBC 

This patch updates the NX driver to perform several hyper calls when necessary
so that the length limits of scatter/gather lists are respected.

Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Reviewed-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Fionnuala Gunter <fin@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Fionnuala Gunter 2013-08-29 11:36:36 -03:00 committed by Herbert Xu
parent 799804348d
commit 9d6f1a82d3
1 changed files with 63 additions and 44 deletions
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107
drivers/crypto/nx/nx-aes-xcbc.c
View File

@ -88,78 +88,97 @@ static int nx_xcbc_update(struct shash_desc *desc,
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(&desc->tfm->base);
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
struct nx_sg *in_sg;
u32 to_process, leftover;
u32 to_process, leftover, total;
u32 max_sg_len;
unsigned long irq_flags;
int rc = 0;
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
/* we've hit the nx chip previously and we're updating again,
* so copy over the partial digest */
memcpy(csbcpb->cpb.aes_xcbc.cv,
csbcpb->cpb.aes_xcbc.out_cv_mac, AES_BLOCK_SIZE);
}
total = sctx->count + len;
/* 2 cases for total data len:
* 1: <= AES_BLOCK_SIZE: copy into state, return 0
* 2: > AES_BLOCK_SIZE: process X blocks, copy in leftover
*/
if (len + sctx->count <= AES_BLOCK_SIZE) {
if (total <= AES_BLOCK_SIZE) {
memcpy(sctx->buffer + sctx->count, data, len);
sctx->count += len;
goto out;
}
/* to_process: the AES_BLOCK_SIZE data chunk to process in this
* update */
to_process = (sctx->count + len) & ~(AES_BLOCK_SIZE - 1);
leftover = (sctx->count + len) & (AES_BLOCK_SIZE - 1);
in_sg = nx_ctx->in_sg;
max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
nx_ctx->ap->sglen);
/* the hardware will not accept a 0 byte operation for this algorithm
* and the operation MUST be finalized to be correct. So if we happen
* to get an update that falls on a block sized boundary, we must
* save off the last block to finalize with later. */
if (!leftover) {
to_process -= AES_BLOCK_SIZE;
leftover = AES_BLOCK_SIZE;
}
do {
if (sctx->count) {
in_sg = nx_build_sg_list(nx_ctx->in_sg, sctx->buffer,
sctx->count, nx_ctx->ap->sglen);
in_sg = nx_build_sg_list(in_sg, (u8 *)data,
to_process - sctx->count,
nx_ctx->ap->sglen);
/* 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, to_process,
NX_PAGE_SIZE * (max_sg_len - 1));
to_process = to_process & ~(AES_BLOCK_SIZE - 1);
leftover = total - to_process;
/* the hardware will not accept a 0 byte operation for this
* algorithm and the operation MUST be finalized to be correct.
* So if we happen to get an update that falls on a block sized
* boundary, we must save off the last block to finalize with
* later. */
if (!leftover) {
to_process -= AES_BLOCK_SIZE;
leftover = AES_BLOCK_SIZE;
}
if (sctx->count) {
in_sg = nx_build_sg_list(nx_ctx->in_sg,
(u8 *) sctx->buffer,
sctx->count,
max_sg_len);
}
in_sg = nx_build_sg_list(in_sg,
(u8 *) data,
to_process - sctx->count,
max_sg_len);
nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
sizeof(struct nx_sg);
} else {
in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *)data, to_process,
nx_ctx->ap->sglen);
nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) *
sizeof(struct nx_sg);
}
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
/* we've hit the nx chip previously and we're updating again,
* so copy over the partial digest */
if (NX_CPB_FDM(csbcpb) & NX_FDM_CONTINUATION) {
memcpy(csbcpb->cpb.aes_xcbc.cv,
csbcpb->cpb.aes_xcbc.out_cv_mac,
AES_BLOCK_SIZE);
}
if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
rc = -EINVAL;
goto out;
}
NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE;
if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
rc = -EINVAL;
goto out;
}
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
if (rc)
goto out;
if (rc)
goto out;
atomic_inc(&(nx_ctx->stats->aes_ops));
atomic_inc(&(nx_ctx->stats->aes_ops));
/* everything after the first update is continuation */
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
total -= to_process;
data += to_process - sctx->count;
sctx->count = 0;
in_sg = nx_ctx->in_sg;
} while (leftover > AES_BLOCK_SIZE);
/* copy the leftover back into the state struct */
memcpy(sctx->buffer, data + len - leftover, leftover);
memcpy(sctx->buffer, data, leftover);
sctx->count = leftover;
/* everything after the first update is continuation */
NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION;
out:
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
return rc;