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author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-04-16 20:48:54 +1000 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2007-05-02 14:38:31 +1000 |
commit | b5b7f08869340aa8cfa23303f7d195f161479592 (patch) | |
tree | dd1f3f00165e7ca31e29a52d64909439cdfab8fd /crypto/algapi.c | |
parent | ebc610e5bc76df073221e64e86c3f7533a09ea40 (diff) | |
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[CRYPTO] api: Add async blkcipher type
This patch adds the mid-level interface for asynchronous block ciphers.
It also includes a generic queueing mechanism that can be used by other
asynchronous crypto operations in future.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r-- | crypto/algapi.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c index 491205e..1c2185b 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -507,6 +507,68 @@ err_free_inst: } EXPORT_SYMBOL_GPL(crypto_alloc_instance); +void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen) +{ + INIT_LIST_HEAD(&queue->list); + queue->backlog = &queue->list; + queue->qlen = 0; + queue->max_qlen = max_qlen; +} +EXPORT_SYMBOL_GPL(crypto_init_queue); + +int crypto_enqueue_request(struct crypto_queue *queue, + struct crypto_async_request *request) +{ + int err = -EINPROGRESS; + + if (unlikely(queue->qlen >= queue->max_qlen)) { + err = -EBUSY; + if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) + goto out; + if (queue->backlog == &queue->list) + queue->backlog = &request->list; + } + + queue->qlen++; + list_add_tail(&request->list, &queue->list); + +out: + return err; +} +EXPORT_SYMBOL_GPL(crypto_enqueue_request); + +struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue) +{ + struct list_head *request; + + if (unlikely(!queue->qlen)) + return NULL; + + queue->qlen--; + + if (queue->backlog != &queue->list) + queue->backlog = queue->backlog->next; + + request = queue->list.next; + list_del(request); + + return list_entry(request, struct crypto_async_request, list); +} +EXPORT_SYMBOL_GPL(crypto_dequeue_request); + +int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm) +{ + struct crypto_async_request *req; + + list_for_each_entry(req, &queue->list, list) { + if (req->tfm == tfm) + return 1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(crypto_tfm_in_queue); + static int __init crypto_algapi_init(void) { crypto_init_proc(); |