2 files changed, 213 insertions, 8 deletions

diff --git a/crypto/chainiv.c b/crypto/chainiv.c
index 38868d160b47..d17fa0454dc3 100644
--- a/crypto/chainiv.c
+++ b/crypto/chainiv.c
@@ -16,16 +16,34 @@
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/random.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
+#include <linux/workqueue.h>
+
+enum {
+        CHAINIV_STATE_INUSE = 0,
+};
 
 struct chainiv_ctx {
         spinlock_t lock;
         char iv[];
 };
 
+struct async_chainiv_ctx {
+        unsigned long state;
+
+        spinlock_t lock;
+        int err;
+
+        struct crypto_queue queue;
+        struct work_struct postponed;
+
+        char iv[];
+};
+
 static int chainiv_givencrypt(struct skcipher_givcrypt_request *req)
 {
         struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
@@ -80,26 +98,187 @@ unlock:
         return chainiv_givencrypt(req);
 }
 
+static int chainiv_init_common(struct crypto_tfm *tfm)
+{
+        tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
+
+        return skcipher_geniv_init(tfm);
+}
+
 static int chainiv_init(struct crypto_tfm *tfm)
 {
-        struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm);
-        struct chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
+        struct chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
 
         spin_lock_init(&ctx->lock);
 
-        tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request);
+        return chainiv_init_common(tfm);
+}
 
-        return skcipher_geniv_init(tfm);
+static int async_chainiv_schedule_work(struct async_chainiv_ctx *ctx)
+{
+        int queued;
+
+        if (!ctx->queue.qlen) {
+                smp_mb__before_clear_bit();
+                clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
+
+                if (!ctx->queue.qlen ||
+                    test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
+                        goto out;
+        }
+
+        queued = schedule_work(&ctx->postponed);
+        BUG_ON(!queued);
+
+out:
+        return ctx->err;
+}
+
+static int async_chainiv_postpone_request(struct skcipher_givcrypt_request *req)
+{
+        struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
+        struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
+        int err;
+
+        spin_lock_bh(&ctx->lock);
+        err = skcipher_enqueue_givcrypt(&ctx->queue, req);
+        spin_unlock_bh(&ctx->lock);
+
+        if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
+                return err;
+
+        ctx->err = err;
+        return async_chainiv_schedule_work(ctx);
+}
+
+static int async_chainiv_givencrypt_tail(struct skcipher_givcrypt_request *req)
+{
+        struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
+        struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
+        struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
+        unsigned int ivsize = crypto_ablkcipher_ivsize(geniv);
+
+        memcpy(req->giv, ctx->iv, ivsize);
+        memcpy(subreq->info, ctx->iv, ivsize);
+
+        ctx->err = crypto_ablkcipher_encrypt(subreq);
+        if (ctx->err)
+                goto out;
+
+        memcpy(ctx->iv, subreq->info, ivsize);
+
+out:
+        return async_chainiv_schedule_work(ctx);
+}
+
+static int async_chainiv_givencrypt(struct skcipher_givcrypt_request *req)
+{
+        struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
+        struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
+        struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req);
+
+        ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv));
+        ablkcipher_request_set_callback(subreq, req->creq.base.flags,
+                                        req->creq.base.complete,
+                                        req->creq.base.data);
+        ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst,
+                                     req->creq.nbytes, req->creq.info);
+
+        if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
+                goto postpone;
+
+        if (ctx->queue.qlen) {
+                clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
+                goto postpone;
+        }
+
+        return async_chainiv_givencrypt_tail(req);
+
+postpone:
+        return async_chainiv_postpone_request(req);
+}
+
+static int async_chainiv_givencrypt_first(struct skcipher_givcrypt_request *req)
+{
+        struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req);
+        struct async_chainiv_ctx *ctx = crypto_ablkcipher_ctx(geniv);
+
+        if (test_and_set_bit(CHAINIV_STATE_INUSE, &ctx->state))
+                goto out;
+
+        if (crypto_ablkcipher_crt(geniv)->givencrypt !=
+            async_chainiv_givencrypt_first)
+                goto unlock;
+
+        crypto_ablkcipher_crt(geniv)->givencrypt = async_chainiv_givencrypt;
+        get_random_bytes(ctx->iv, crypto_ablkcipher_ivsize(geniv));
+
+unlock:
+        clear_bit(CHAINIV_STATE_INUSE, &ctx->state);
+
+out:
+        return async_chainiv_givencrypt(req);
+}
+
+static void async_chainiv_do_postponed(struct work_struct *work)
+{
+        struct async_chainiv_ctx *ctx = container_of(work,
+                                                     struct async_chainiv_ctx,
+                                                     postponed);
+        struct skcipher_givcrypt_request *req;
+        struct ablkcipher_request *subreq;
+
+        /* Only handle one request at a time to avoid hogging keventd. */
+        spin_lock_bh(&ctx->lock);
+        req = skcipher_dequeue_givcrypt(&ctx->queue);
+        spin_unlock_bh(&ctx->lock);
+
+        if (!req) {
+                async_chainiv_schedule_work(ctx);
+                return;
+        }
+
+        subreq = skcipher_givcrypt_reqctx(req);
+        subreq->base.flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
+
+        async_chainiv_givencrypt_tail(req);
+}
+
+static int async_chainiv_init(struct crypto_tfm *tfm)
+{
+        struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        spin_lock_init(&ctx->lock);
+
+        crypto_init_queue(&ctx->queue, 100);
+        INIT_WORK(&ctx->postponed, async_chainiv_do_postponed);
+
+        return chainiv_init_common(tfm);
+}
+
+static void async_chainiv_exit(struct crypto_tfm *tfm)
+{
+        struct async_chainiv_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        BUG_ON(test_bit(CHAINIV_STATE_INUSE, &ctx->state) || ctx->queue.qlen);
+
+        skcipher_geniv_exit(tfm);
 }
 
 static struct crypto_template chainiv_tmpl;
 
 static struct crypto_instance *chainiv_alloc(struct rtattr **tb)
 {
+        struct crypto_attr_type *algt;
         struct crypto_instance *inst;
+        int err;
 
-        inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0,
-                                    CRYPTO_ALG_ASYNC);
+        algt = crypto_get_attr_type(tb);
+        err = PTR_ERR(algt);
+        if (IS_ERR(algt))
+                return ERR_PTR(err);
+
+        inst = skcipher_geniv_alloc(&chainiv_tmpl, tb, 0, 0);
         if (IS_ERR(inst))
                 goto out;
 
@@ -108,8 +287,21 @@ static struct crypto_instance *chainiv_alloc(struct rtattr **tb)
         inst->alg.cra_init = chainiv_init;
         inst->alg.cra_exit = skcipher_geniv_exit;
 
-        inst->alg.cra_ctxsize = sizeof(struct chainiv_ctx) +
-                                inst->alg.cra_ablkcipher.ivsize;
+        inst->alg.cra_ctxsize = sizeof(struct chainiv_ctx);
+
+        if (!crypto_requires_sync(algt->type, algt->mask)) {
+                inst->alg.cra_flags |= CRYPTO_ALG_ASYNC;
+
+                inst->alg.cra_ablkcipher.givencrypt =
+                        async_chainiv_givencrypt_first;
+
+                inst->alg.cra_init = async_chainiv_init;
+                inst->alg.cra_exit = async_chainiv_exit;
+
+                inst->alg.cra_ctxsize = sizeof(struct async_chainiv_ctx);
+        }
+
+        inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize;
 
 out:
         return inst;
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 0053f34764ff..2ba42cd7d6aa 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -70,6 +70,19 @@ static inline struct crypto_ablkcipher *skcipher_geniv_cipher(
         return crypto_ablkcipher_crt(geniv)->base;
 }
 
+static inline int skcipher_enqueue_givcrypt(
+        struct crypto_queue *queue, struct skcipher_givcrypt_request *request)
+{
+        return ablkcipher_enqueue_request(queue, &request->creq);
+}
+
+static inline struct skcipher_givcrypt_request *skcipher_dequeue_givcrypt(
+        struct crypto_queue *queue)
+{
+        return container_of(ablkcipher_dequeue_request(queue),
+                            struct skcipher_givcrypt_request, creq);
+}
+
 static inline void *skcipher_givcrypt_reqctx(
         struct skcipher_givcrypt_request *req)
 {