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crypto: marvell/cesa - rearrange handling for sw padded hashes 

Rearrange the last request handling for hashes which require software
padding.

We prepare the padding to be appended, and then append as much of the
padding to any existing data that's already queued up, adding an
operation block and launching the operation.

Any remainder is then appended as a separate operation.

This ensures that the hardware only ever sees multiples of the hash
block size to be operated on for software padded hashes, thus ensuring
that the engine always indicates that it has finished the calculation.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Russell King 2015-10-18 17:24:47 +01:00 committed by Herbert Xu
parent aee84a7e6e
commit ab270e7055
1 changed files with 18 additions and 26 deletions
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44
drivers/crypto/marvell/hash.c
View File

@ -559,39 +559,31 @@ mv_cesa_ahash_dma_last_req(struct mv_cesa_tdma_chain *chain,
trailerlen = mv_cesa_ahash_pad_req(creq, ahashdreq->padding);
if (frag_len) {
op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl, frag_len,
flags);
if (IS_ERR(op))
return op;
} else {
op = NULL;
}
if (op) {
len = min(CESA_SA_SRAM_PAYLOAD_SIZE - dma_iter->base.op_len,
trailerlen);
if (len) {
ret = mv_cesa_dma_add_data_transfer(chain,
len = min(CESA_SA_SRAM_PAYLOAD_SIZE - frag_len, trailerlen);
if (len) {
ret = mv_cesa_dma_add_data_transfer(chain,
CESA_SA_DATA_SRAM_OFFSET +
dma_iter->base.op_len,
frag_len,
ahashdreq->padding_dma,
len, CESA_TDMA_DST_IN_SRAM,
flags);
if (ret)
return ERR_PTR(ret);
if (ret)
return ERR_PTR(ret);
mv_cesa_update_op_cfg(op, CESA_SA_DESC_CFG_MID_FRAG,
CESA_SA_DESC_CFG_FRAG_MSK);
mv_cesa_set_mac_op_frag_len(op,
dma_iter->base.op_len + len);
padoff += len;
}
op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl, frag_len + len,
flags);
if (IS_ERR(op))
return op;
mv_cesa_update_op_cfg(op, CESA_SA_DESC_CFG_MID_FRAG,
CESA_SA_DESC_CFG_FRAG_MSK);
if (len == trailerlen)
return op;
padoff += len;
}
if (padoff >= trailerlen)
return op;
if (!mv_cesa_mac_op_is_first_frag(&creq->op_tmpl))
mv_cesa_update_op_cfg(&creq->op_tmpl,
CESA_SA_DESC_CFG_MID_FRAG,