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crypto: omap-sham - set sw fallback to 240 bytes

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Adds software fallback support for small crypto requests. In these cases,
it is undesirable to use DMA, as setting it up itself is rather heavy
operation. Gives about 40% extra performance in ipsec usecase.

Signed-off-by: Bin Liu <b-liu@ti.com>
[t-kristo@ti.com: dropped the extra traces, updated some comments
 on the code]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Bin Liu 2016-06-22 16:23:37 +03:00 committed by Herbert Xu
parent b973eaab68
commit 85e0687f8f
1 changed files with 8 additions and 4 deletions
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12
drivers/crypto/omap-sham.c
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@ -1095,7 +1095,7 @@ static int omap_sham_update(struct ahash_request *req)
ctx->offset = 0;
if (ctx->flags & BIT(FLAGS_FINUP)) {
if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 240) {
/*
* OMAP HW accel works only with buffers >= 9
* will switch to bypass in final()
@ -1151,9 +1151,13 @@ static int omap_sham_final(struct ahash_request *req)
if (ctx->flags & BIT(FLAGS_ERROR))
return 0; /* uncompleted hash is not needed */
/* OMAP HW accel works only with buffers >= 9 */
/* HMAC is always >= 9 because ipad == block size */
if ((ctx->digcnt + ctx->bufcnt) < 9)
/*
* OMAP HW accel works only with buffers >= 9.
* HMAC is always >= 9 because ipad == block size.
* If buffersize is less than 240, we use fallback SW encoding,
* as using DMA + HW in this case doesn't provide any benefit.
*/
if ((ctx->digcnt + ctx->bufcnt) < 240)
return omap_sham_final_shash(req);
else if (ctx->bufcnt)
return omap_sham_enqueue(req, OP_FINAL);