Re: [PATCH 06/12] crypto: caam - change return code in caam_jr_enqueue function

From: Bastian Krause
Date: Tue Dec 10 2019 - 06:56:53 EST

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Hi,

On 11/17/19 11:30 PM, Iuliana Prodan wrote:
> Change the return code of caam_jr_enqueue function to -EINPROGRESS, in
> case of success, -ENOSPC in case the CAAM is busy (has no space left
> in job ring queue), -EIO if it cannot map the caller's descriptor.
>
> Update, also, the cases for resource-freeing for each algorithm type.
>
> Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
> Reviewed-by: Horia GeantÄ <horia.geanta@xxxxxxx>
> ---
> drivers/crypto/caam/caamalg.c | 16 ++++------------
> drivers/crypto/caam/caamhash.c | 34 +++++++++++-----------------------
> drivers/crypto/caam/caampkc.c | 16 ++++++++--------
> drivers/crypto/caam/caamrng.c | 4 ++--
> drivers/crypto/caam/jr.c | 8 ++++----
> drivers/crypto/caam/key_gen.c | 2 +-
> 6 files changed, 30 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c
> index 6e021692..21b6172 100644
> --- a/drivers/crypto/caam/caamalg.c
> +++ b/drivers/crypto/caam/caamalg.c
> @@ -1417,9 +1417,7 @@ static inline int chachapoly_crypt(struct aead_request *req, bool encrypt)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> aead_unmap(jrdev, edesc, req);
> kfree(edesc);
> }
> @@ -1462,9 +1460,7 @@ static inline int aead_crypt(struct aead_request *req, bool encrypt)
>
> desc = edesc->hw_desc;
> ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> aead_unmap(jrdev, edesc, req);
> kfree(edesc);
> }
> @@ -1507,9 +1503,7 @@ static inline int gcm_crypt(struct aead_request *req, bool encrypt)
>
> desc = edesc->hw_desc;
> ret = caam_jr_enqueue(jrdev, desc, aead_crypt_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> aead_unmap(jrdev, edesc, req);
> kfree(edesc);
> }
> @@ -1725,9 +1719,7 @@ static inline int skcipher_crypt(struct skcipher_request *req, bool encrypt)
> desc = edesc->hw_desc;
> ret = caam_jr_enqueue(jrdev, desc, skcipher_crypt_done, req);
>
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> skcipher_unmap(jrdev, edesc, req);
> kfree(edesc);
> }
> diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c
> index 5f9f16c..baf4ab1 100644
> --- a/drivers/crypto/caam/caamhash.c
> +++ b/drivers/crypto/caam/caamhash.c
> @@ -422,7 +422,7 @@ static int hash_digest_key(struct caam_hash_ctx *ctx, u32 *keylen, u8 *key,
> init_completion(&result.completion);
>
> ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
> - if (!ret) {
> + if (ret == -EINPROGRESS) {
> /* in progress */
> wait_for_completion(&result.completion);
> ret = result.err;
> @@ -858,10 +858,8 @@ static int ahash_update_ctx(struct ahash_request *req)
> desc_bytes(desc), 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done_bi, req);
> - if (ret)
> + if (ret != -EINPROGRESS)
> goto unmap_ctx;
> -
> - ret = -EINPROGRESS;
> } else if (*next_buflen) {
> scatterwalk_map_and_copy(buf + *buflen, req->src, 0,
> req->nbytes, 0);
> @@ -936,10 +934,9 @@ static int ahash_final_ctx(struct ahash_request *req)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_src, req);
> - if (ret)
> - goto unmap_ctx;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> - return -EINPROGRESS;
> unmap_ctx:
> ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_BIDIRECTIONAL);
> kfree(edesc);
> @@ -1013,10 +1010,9 @@ static int ahash_finup_ctx(struct ahash_request *req)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_src, req);
> - if (ret)
> - goto unmap_ctx;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> - return -EINPROGRESS;
> unmap_ctx:
> ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_BIDIRECTIONAL);
> kfree(edesc);
> @@ -1086,9 +1082,7 @@ static int ahash_digest(struct ahash_request *req)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
> kfree(edesc);
> }
> @@ -1138,9 +1132,7 @@ static int ahash_final_no_ctx(struct ahash_request *req)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
> kfree(edesc);
> }
> @@ -1258,10 +1250,9 @@ static int ahash_update_no_ctx(struct ahash_request *req)
> desc_bytes(desc), 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_dst, req);
> - if (ret)
> + if (ret != -EINPROGRESS)
> goto unmap_ctx;
>
> - ret = -EINPROGRESS;
> state->update = ahash_update_ctx;
> state->finup = ahash_finup_ctx;
> state->final = ahash_final_ctx;
> @@ -1353,9 +1344,7 @@ static int ahash_finup_no_ctx(struct ahash_request *req)
> 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done, req);
> - if (!ret) {
> - ret = -EINPROGRESS;
> - } else {
> + if (ret != -EINPROGRESS) {
> ahash_unmap_ctx(jrdev, edesc, req, digestsize, DMA_FROM_DEVICE);
> kfree(edesc);
> }
> @@ -1452,10 +1441,9 @@ static int ahash_update_first(struct ahash_request *req)
> desc_bytes(desc), 1);
>
> ret = caam_jr_enqueue(jrdev, desc, ahash_done_ctx_dst, req);
> - if (ret)
> + if (ret != -EINPROGRESS)
> goto unmap_ctx;
>
> - ret = -EINPROGRESS;
> state->update = ahash_update_ctx;
> state->finup = ahash_finup_ctx;
> state->final = ahash_final_ctx;
> diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c
> index ebf1677..7f7ea32 100644
> --- a/drivers/crypto/caam/caampkc.c
> +++ b/drivers/crypto/caam/caampkc.c
> @@ -634,8 +634,8 @@ static int caam_rsa_enc(struct akcipher_request *req)
> init_rsa_pub_desc(edesc->hw_desc, &edesc->pdb.pub);
>
> ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_pub_done, req);
> - if (!ret)
> - return -EINPROGRESS;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> rsa_pub_unmap(jrdev, edesc, req);
>
> @@ -667,8 +667,8 @@ static int caam_rsa_dec_priv_f1(struct akcipher_request *req)
> init_rsa_priv_f1_desc(edesc->hw_desc, &edesc->pdb.priv_f1);
>
> ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
> - if (!ret)
> - return -EINPROGRESS;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> rsa_priv_f1_unmap(jrdev, edesc, req);
>
> @@ -700,8 +700,8 @@ static int caam_rsa_dec_priv_f2(struct akcipher_request *req)
> init_rsa_priv_f2_desc(edesc->hw_desc, &edesc->pdb.priv_f2);
>
> ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
> - if (!ret)
> - return -EINPROGRESS;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> rsa_priv_f2_unmap(jrdev, edesc, req);
>
> @@ -733,8 +733,8 @@ static int caam_rsa_dec_priv_f3(struct akcipher_request *req)
> init_rsa_priv_f3_desc(edesc->hw_desc, &edesc->pdb.priv_f3);
>
> ret = caam_jr_enqueue(jrdev, edesc->hw_desc, rsa_priv_f_done, req);
> - if (!ret)
> - return -EINPROGRESS;
> + if (ret == -EINPROGRESS)
> + return ret;
>
> rsa_priv_f3_unmap(jrdev, edesc, req);
>
> diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
> index e8baaca..e3e4bf2 100644
> --- a/drivers/crypto/caam/caamrng.c
> +++ b/drivers/crypto/caam/caamrng.c
> @@ -133,7 +133,7 @@ static inline int submit_job(struct caam_rng_ctx *ctx, int to_current)
> dev_dbg(jrdev, "submitting job %d\n", !(to_current ^ ctx->current_buf));
> init_completion(&bd->filled);
> err = caam_jr_enqueue(jrdev, desc, rng_done, ctx);
> - if (err)
> + if (err != EINPROGRESS)

Shouldn't this be -EINPROGRESS ?

> complete(&bd->filled); /* don't wait on failed job*/
> else
> atomic_inc(&bd->empty); /* note if pending */
> @@ -153,7 +153,7 @@ static int caam_read(struct hwrng *rng, void *data, size_t max, bool wait)
> if (atomic_read(&bd->empty) == BUF_EMPTY) {
> err = submit_job(ctx, 1);
> /* if can't submit job, can't even wait */
> - if (err)
> + if (err != EINPROGRESS)

And here the same?

Regards,
Bastian

> return 0;
> }
> /* no immediate data, so exit if not waiting */
> diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c
> index fc97cde..df2a050 100644
> --- a/drivers/crypto/caam/jr.c
> +++ b/drivers/crypto/caam/jr.c
> @@ -324,8 +324,8 @@ void caam_jr_free(struct device *rdev)
> EXPORT_SYMBOL(caam_jr_free);
>
> /**
> - * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
> - * -EBUSY if the queue is full, -EIO if it cannot map the caller's
> + * caam_jr_enqueue() - Enqueue a job descriptor head. Returns -EINPROGRESS
> + * if OK, -ENOSPC if the queue is full, -EIO if it cannot map the caller's
> * descriptor.
> * @dev: device of the job ring to be used. This device should have
> * been assigned prior by caam_jr_register().
> @@ -377,7 +377,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
> CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
> spin_unlock_bh(&jrp->inplock);
> dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
> - return -EBUSY;
> + return -ENOSPC;
> }
>
> head_entry = &jrp->entinfo[head];
> @@ -414,7 +414,7 @@ int caam_jr_enqueue(struct device *dev, u32 *desc,
>
> spin_unlock_bh(&jrp->inplock);
>
> - return 0;
> + return -EINPROGRESS;
> }
> EXPORT_SYMBOL(caam_jr_enqueue);
>
> diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c
> index 5a851dd..b0e8a49 100644
> --- a/drivers/crypto/caam/key_gen.c
> +++ b/drivers/crypto/caam/key_gen.c
> @@ -108,7 +108,7 @@ int gen_split_key(struct device *jrdev, u8 *key_out,
> init_completion(&result.completion);
>
> ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
> - if (!ret) {
> + if (ret == -EINPROGRESS) {
> /* in progress */
> wait_for_completion(&result.completion);
> ret = result.err;
>

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Next message: Nicholas Johnson: "Re: Linux v5.5 serious PCI bug"
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Next in thread: Iuliana Prodan: "Re: [PATCH 06/12] crypto: caam - change return code in caam_jr_enqueue function"
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