[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>

1 files changed, 62 insertions, 0 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 491205e11cbe..1c2185b5b005 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();