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crypto: mv_cesa - Make the copy-back of data optional

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Make the copy-back of data optional (not done in hashing requests)

Signed-off-by: Uri Simchoni <uri@jdland.co.il>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Uri Simchoni 2010-04-08 19:31:48 +03:00 • committed by Herbert Xu
parent a58094ac5f
commit f0d03deaad
1 changed files with 27 additions and 22 deletions
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49
drivers/crypto/mv_cesa.c
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@ -40,6 +40,7 @@ enum engine_status {
* @src_start: offset to add to src start position (scatter list) * @src_start: offset to add to src start position (scatter list)
* @crypt_len: length of current crypt process * @crypt_len: length of current crypt process
* @hw_nbytes: total bytes to process in hw for this request * @hw_nbytes: total bytes to process in hw for this request
* @copy_back: whether to copy data back (crypt) or not (hash)
* @sg_dst_left: bytes left dst to process in this scatter list * @sg_dst_left: bytes left dst to process in this scatter list
* @dst_start: offset to add to dst start position (scatter list) * @dst_start: offset to add to dst start position (scatter list)
* @hw_processed_bytes: number of bytes processed by hw (request). * @hw_processed_bytes: number of bytes processed by hw (request).
@ -60,6 +61,7 @@ struct req_progress {
int crypt_len; int crypt_len;
int hw_nbytes; int hw_nbytes;
/* dst mostly */ /* dst mostly */
int copy_back;
int sg_dst_left; int sg_dst_left;
int dst_start; int dst_start;
int hw_processed_bytes; int hw_processed_bytes;
@ -267,33 +269,35 @@ static void dequeue_complete_req(void)
struct crypto_async_request *req = cpg->cur_req; struct crypto_async_request *req = cpg->cur_req;
void *buf; void *buf;
int ret; int ret;
int need_copy_len = cpg->p.crypt_len;
int sram_offset = 0;
cpg->p.hw_processed_bytes += cpg->p.crypt_len; cpg->p.hw_processed_bytes += cpg->p.crypt_len;
do { if (cpg->p.copy_back) {
int dst_copy; int need_copy_len = cpg->p.crypt_len;
int sram_offset = 0;
do {
int dst_copy;
if (!cpg->p.sg_dst_left) { if (!cpg->p.sg_dst_left) {
ret = sg_miter_next(&cpg->p.dst_sg_it); ret = sg_miter_next(&cpg->p.dst_sg_it);
BUG_ON(!ret); BUG_ON(!ret);
cpg->p.sg_dst_left = cpg->p.dst_sg_it.length; cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
cpg->p.dst_start = 0; cpg->p.dst_start = 0;
} }
buf = cpg->p.dst_sg_it.addr; buf = cpg->p.dst_sg_it.addr;
buf += cpg->p.dst_start; buf += cpg->p.dst_start;
dst_copy = min(need_copy_len, cpg->p.sg_dst_left); dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
memcpy(buf,
cpg->sram + SRAM_DATA_OUT_START + sram_offset,
dst_copy);
sram_offset += dst_copy;
cpg->p.sg_dst_left -= dst_copy;
need_copy_len -= dst_copy;
cpg->p.dst_start += dst_copy;
} while (need_copy_len > 0);
}
memcpy(buf,
cpg->sram + SRAM_DATA_OUT_START + sram_offset,
dst_copy);
sram_offset += dst_copy;
cpg->p.sg_dst_left -= dst_copy;
need_copy_len -= dst_copy;
cpg->p.dst_start += dst_copy;
} while (need_copy_len > 0);
BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE); BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) { if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) {
@ -336,6 +340,7 @@ static void mv_enqueue_new_req(struct ablkcipher_request *req)
p->hw_nbytes = req->nbytes; p->hw_nbytes = req->nbytes;
p->complete = mv_crypto_algo_completion; p->complete = mv_crypto_algo_completion;
p->process = mv_process_current_q; p->process = mv_process_current_q;
p->copy_back = 1;
num_sgs = count_sgs(req->src, req->nbytes); num_sgs = count_sgs(req->src, req->nbytes);
sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG); sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);