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crypto: sun8i-ss - use sg_nents_for_len 

When testing with some large SG list, the sun8i-ss drivers always
fallback even if it can handle it.
So use sg_nents_for_len() which permits to see less SGs than needed.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Corentin Labbe 2022-05-02 20:19:18 +00:00 committed by Herbert Xu
parent d86e3f37a6
commit 4d867bebdc
1 changed files with 10 additions and 13 deletions
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23
drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
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@ -29,7 +29,8 @@ static bool sun8i_ss_need_fallback(struct skcipher_request *areq)
if (areq->cryptlen == 0 || areq->cryptlen % 16)
return true;
if (sg_nents(areq->src) > 8 || sg_nents(areq->dst) > 8)
if (sg_nents_for_len(areq->src, areq->cryptlen) > 8 ||
sg_nents_for_len(areq->dst, areq->cryptlen) > 8)
return true;
sg = areq->src;
@ -169,6 +170,8 @@ static int sun8i_ss_cipher(struct skcipher_request *areq)
int nr_sgs = 0;
int nr_sgd = 0;
int err = 0;
int nsgs = sg_nents_for_len(areq->src, areq->cryptlen);
int nsgd = sg_nents_for_len(areq->dst, areq->cryptlen);
int i;
algt = container_of(alg, struct sun8i_ss_alg_template, alg.skcipher);
@ -201,8 +204,7 @@ static int sun8i_ss_cipher(struct skcipher_request *areq)
goto theend_key;
}
if (areq->src == areq->dst) {
nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
DMA_BIDIRECTIONAL);
nr_sgs = dma_map_sg(ss->dev, areq->src, nsgs, DMA_BIDIRECTIONAL);
if (nr_sgs <= 0 || nr_sgs > 8) {
dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
err = -EINVAL;
@ -210,15 +212,13 @@ static int sun8i_ss_cipher(struct skcipher_request *areq)
}
nr_sgd = nr_sgs;
} else {
nr_sgs = dma_map_sg(ss->dev, areq->src, sg_nents(areq->src),
DMA_TO_DEVICE);
nr_sgs = dma_map_sg(ss->dev, areq->src, nsgs, DMA_TO_DEVICE);
if (nr_sgs <= 0 || nr_sgs > 8) {
dev_err(ss->dev, "Invalid sg number %d\n", nr_sgs);
err = -EINVAL;
goto theend_iv;
}
nr_sgd = dma_map_sg(ss->dev, areq->dst, sg_nents(areq->dst),
DMA_FROM_DEVICE);
nr_sgd = dma_map_sg(ss->dev, areq->dst, nsgd, DMA_FROM_DEVICE);
if (nr_sgd <= 0 || nr_sgd > 8) {
dev_err(ss->dev, "Invalid sg number %d\n", nr_sgd);
err = -EINVAL;
@ -274,13 +274,10 @@ sgd_next:
theend_sgs:
if (areq->src == areq->dst) {
dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
DMA_BIDIRECTIONAL);
dma_unmap_sg(ss->dev, areq->src, nsgs, DMA_BIDIRECTIONAL);
} else {
dma_unmap_sg(ss->dev, areq->src, sg_nents(areq->src),
DMA_TO_DEVICE);
dma_unmap_sg(ss->dev, areq->dst, sg_nents(areq->dst),
DMA_FROM_DEVICE);
dma_unmap_sg(ss->dev, areq->src, nsgs, DMA_TO_DEVICE);
dma_unmap_sg(ss->dev, areq->dst, nsgd, DMA_FROM_DEVICE);
}
theend_iv: