crypto: sha-mb - multibuffer crypto infrastructure

This patch introduces the multi-buffer crypto daemon which is responsible
for submitting crypto jobs in a work queue to the responsible multi-buffer
crypto algorithm.  The idea of the multi-buffer algorihtm is to put
data streams from multiple jobs in a wide (AVX2) register and then
take advantage of SIMD instructions to do crypto computation on several
buffers simultaneously.

The multi-buffer crypto daemon is also responsbile for flushing the
remaining buffers to complete the computation if no new buffers arrive
for a while.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 736 insertions, 0 deletions

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 00b5906f57b7..86dc81f80bc5 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -158,6 +158,20 @@ config CRYPTO_CRYPTD
           converts an arbitrary synchronous software crypto algorithm
           into an asynchronous algorithm that executes in a kernel thread.
 
+config CRYPTO_MCRYPTD
+        tristate "Software async multi-buffer crypto daemon"
+        select CRYPTO_BLKCIPHER
+        select CRYPTO_HASH
+        select CRYPTO_MANAGER
+        select CRYPTO_WORKQUEUE
+        help
+          This is a generic software asynchronous crypto daemon that
+          provides the kernel thread to assist multi-buffer crypto
+          algorithms for submitting jobs and flushing jobs in multi-buffer
+          crypto algorithms.  Multi-buffer crypto algorithms are executed
+          in the context of this kernel thread and drivers can post
+          their crypto request asyncrhously and process by this daemon.
+
 config CRYPTO_AUTHENC
         tristate "Authenc support"
         select CRYPTO_AEAD
@@ -559,6 +573,22 @@ config CRYPTO_SHA1_PPC
           This is the powerpc hardware accelerated implementation of the
           SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
 
+config CRYPTO_SHA1_MB
+        tristate "SHA1 digest algorithm (x86_64 Multi-Buffer, Experimental)"
+        depends on X86 && 64BIT
+        select CRYPTO_SHA1
+        select CRYPTO_HASH
+        select CRYPTO_MCRYPTD
+        help
+          SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2) implemented
+          using multi-buffer technique.  This algorithm computes on
+          multiple data lanes concurrently with SIMD instructions for
+          better throughput.  It should not be enabled by default but
+          used when there is significant amount of work to keep the keep
+          the data lanes filled to get performance benefit.  If the data
+          lanes remain unfilled, a flush operation will be initiated to
+          process the crypto jobs, adding a slight latency.
+
 config CRYPTO_SHA256
         tristate "SHA224 and SHA256 digest algorithm"
         select CRYPTO_HASH
diff --git a/crypto/Makefile b/crypto/Makefile
index cfa57b3f5a4d..1445b9100c05 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_CRYPTO_GCM) += gcm.o
 obj-$(CONFIG_CRYPTO_CCM) += ccm.o
 obj-$(CONFIG_CRYPTO_PCRYPT) += pcrypt.o
 obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
+obj-$(CONFIG_CRYPTO_MCRYPTD) += mcryptd.o
 obj-$(CONFIG_CRYPTO_DES) += des_generic.o
 obj-$(CONFIG_CRYPTO_FCRYPT) += fcrypt.o
 obj-$(CONFIG_CRYPTO_BLOWFISH) += blowfish_generic.o
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
new file mode 100644
index 000000000000..dbc20d1f9381
--- /dev/null
+++ b/crypto/mcryptd.c
@@ -0,0 +1,705 @@
+/*
+ * Software multibuffer async crypto daemon.
+ *
+ * Copyright (c) 2014 Tim Chen <tim.c.chen@linux.intel.com>
+ *
+ * Adapted from crypto daemon.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/internal/hash.h>
+#include <crypto/internal/aead.h>
+#include <crypto/mcryptd.h>
+#include <crypto/crypto_wq.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/hardirq.h>
+
+#define MCRYPTD_MAX_CPU_QLEN 100
+#define MCRYPTD_BATCH 9
+
+static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
+                                   unsigned int tail);
+
+struct mcryptd_flush_list {
+        struct list_head list;
+        struct mutex lock;
+};
+
+struct mcryptd_flush_list __percpu *mcryptd_flist;
+
+struct hashd_instance_ctx {
+        struct crypto_shash_spawn spawn;
+        struct mcryptd_queue *queue;
+};
+
+static void mcryptd_queue_worker(struct work_struct *work);
+
+void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay)
+{
+        struct mcryptd_flush_list *flist;
+
+        if (!cstate->flusher_engaged) {
+                /* put the flusher on the flush list */
+                flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
+                mutex_lock(&flist->lock);
+                list_add_tail(&cstate->flush_list, &flist->list);
+                cstate->flusher_engaged = true;
+                cstate->next_flush = jiffies + delay;
+                queue_delayed_work_on(smp_processor_id(), kcrypto_wq,
+                        &cstate->flush, delay);
+                mutex_unlock(&flist->lock);
+        }
+}
+EXPORT_SYMBOL(mcryptd_arm_flusher);
+
+static int mcryptd_init_queue(struct mcryptd_queue *queue,
+                             unsigned int max_cpu_qlen)
+{
+        int cpu;
+        struct mcryptd_cpu_queue *cpu_queue;
+
+        queue->cpu_queue = alloc_percpu(struct mcryptd_cpu_queue);
+        pr_debug("mqueue:%p mcryptd_cpu_queue %p\n", queue, queue->cpu_queue);
+        if (!queue->cpu_queue)
+                return -ENOMEM;
+        for_each_possible_cpu(cpu) {
+                cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+                pr_debug("cpu_queue #%d %p\n", cpu, queue->cpu_queue);
+                crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
+                INIT_WORK(&cpu_queue->work, mcryptd_queue_worker);
+        }
+        return 0;
+}
+
+static void mcryptd_fini_queue(struct mcryptd_queue *queue)
+{
+        int cpu;
+        struct mcryptd_cpu_queue *cpu_queue;
+
+        for_each_possible_cpu(cpu) {
+                cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+                BUG_ON(cpu_queue->queue.qlen);
+        }
+        free_percpu(queue->cpu_queue);
+}
+
+static int mcryptd_enqueue_request(struct mcryptd_queue *queue,
+                                  struct crypto_async_request *request,
+                                  struct mcryptd_hash_request_ctx *rctx)
+{
+        int cpu, err;
+        struct mcryptd_cpu_queue *cpu_queue;
+
+        cpu = get_cpu();
+        cpu_queue = this_cpu_ptr(queue->cpu_queue);
+        rctx->tag.cpu = cpu;
+
+        err = crypto_enqueue_request(&cpu_queue->queue, request);
+        pr_debug("enqueue request: cpu %d cpu_queue %p request %p\n",
+                 cpu, cpu_queue, request);
+        queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
+        put_cpu();
+
+        return err;
+}
+
+/*
+ * Try to opportunisticlly flush the partially completed jobs if
+ * crypto daemon is the only task running.
+ */
+static void mcryptd_opportunistic_flush(void)
+{
+        struct mcryptd_flush_list *flist;
+        struct mcryptd_alg_cstate *cstate;
+
+        flist = per_cpu_ptr(mcryptd_flist, smp_processor_id());
+        while (single_task_running()) {
+                mutex_lock(&flist->lock);
+                if (list_empty(&flist->list)) {
+                        mutex_unlock(&flist->lock);
+                        return;
+                }
+                cstate = list_entry(flist->list.next,
+                                struct mcryptd_alg_cstate, flush_list);
+                if (!cstate->flusher_engaged) {
+                        mutex_unlock(&flist->lock);
+                        return;
+                }
+                list_del(&cstate->flush_list);
+                cstate->flusher_engaged = false;
+                mutex_unlock(&flist->lock);
+                cstate->alg_state->flusher(cstate);
+        }
+}
+
+/*
+ * Called in workqueue context, do one real cryption work (via
+ * req->complete) and reschedule itself if there are more work to
+ * do.
+ */
+static void mcryptd_queue_worker(struct work_struct *work)
+{
+        struct mcryptd_cpu_queue *cpu_queue;
+        struct crypto_async_request *req, *backlog;
+        int i;
+
+        /*
+         * Need to loop through more than once for multi-buffer to
+         * be effective.
+         */
+
+        cpu_queue = container_of(work, struct mcryptd_cpu_queue, work);
+        i = 0;
+        while (i < MCRYPTD_BATCH || single_task_running()) {
+                /*
+                 * preempt_disable/enable is used to prevent
+                 * being preempted by mcryptd_enqueue_request()
+                 */
+                local_bh_disable();
+                preempt_disable();
+                backlog = crypto_get_backlog(&cpu_queue->queue);
+                req = crypto_dequeue_request(&cpu_queue->queue);
+                preempt_enable();
+                local_bh_enable();
+
+                if (!req) {
+                        mcryptd_opportunistic_flush();
+                        return;
+                }
+
+                if (backlog)
+                        backlog->complete(backlog, -EINPROGRESS);
+                req->complete(req, 0);
+                if (!cpu_queue->queue.qlen)
+                        return;
+                ++i;
+        }
+        if (cpu_queue->queue.qlen)
+                queue_work(kcrypto_wq, &cpu_queue->work);
+}
+
+void mcryptd_flusher(struct work_struct *__work)
+{
+        struct  mcryptd_alg_cstate      *alg_cpu_state;
+        struct  mcryptd_alg_state       *alg_state;
+        struct  mcryptd_flush_list      *flist;
+        int     cpu;
+
+        cpu = smp_processor_id();
+        alg_cpu_state = container_of(to_delayed_work(__work),
+                                     struct mcryptd_alg_cstate, flush);
+        alg_state = alg_cpu_state->alg_state;
+        if (alg_cpu_state->cpu != cpu)
+                pr_debug("mcryptd error: work on cpu %d, should be cpu %d\n",
+                                cpu, alg_cpu_state->cpu);
+
+        if (alg_cpu_state->flusher_engaged) {
+                flist = per_cpu_ptr(mcryptd_flist, cpu);
+                mutex_lock(&flist->lock);
+                list_del(&alg_cpu_state->flush_list);
+                alg_cpu_state->flusher_engaged = false;
+                mutex_unlock(&flist->lock);
+                alg_state->flusher(alg_cpu_state);
+        }
+}
+EXPORT_SYMBOL_GPL(mcryptd_flusher);
+
+static inline struct mcryptd_queue *mcryptd_get_queue(struct crypto_tfm *tfm)
+{
+        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
+        struct mcryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
+
+        return ictx->queue;
+}
+
+static void *mcryptd_alloc_instance(struct crypto_alg *alg, unsigned int head,
+                                   unsigned int tail)
+{
+        char *p;
+        struct crypto_instance *inst;
+        int err;
+
+        p = kzalloc(head + sizeof(*inst) + tail, GFP_KERNEL);
+        if (!p)
+                return ERR_PTR(-ENOMEM);
+
+        inst = (void *)(p + head);
+
+        err = -ENAMETOOLONG;
+        if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+                    "mcryptd(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+                goto out_free_inst;
+
+        memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
+
+        inst->alg.cra_priority = alg->cra_priority + 50;
+        inst->alg.cra_blocksize = alg->cra_blocksize;
+        inst->alg.cra_alignmask = alg->cra_alignmask;
+
+out:
+        return p;
+
+out_free_inst:
+        kfree(p);
+        p = ERR_PTR(err);
+        goto out;
+}
+
+static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
+{
+        struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
+        struct hashd_instance_ctx *ictx = crypto_instance_ctx(inst);
+        struct crypto_shash_spawn *spawn = &ictx->spawn;
+        struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
+        struct crypto_shash *hash;
+
+        hash = crypto_spawn_shash(spawn);
+        if (IS_ERR(hash))
+                return PTR_ERR(hash);
+
+        ctx->child = hash;
+        crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+                                 sizeof(struct mcryptd_hash_request_ctx) +
+                                 crypto_shash_descsize(hash));
+        return 0;
+}
+
+static void mcryptd_hash_exit_tfm(struct crypto_tfm *tfm)
+{
+        struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
+
+        crypto_free_shash(ctx->child);
+}
+
+static int mcryptd_hash_setkey(struct crypto_ahash *parent,
+                                   const u8 *key, unsigned int keylen)
+{
+        struct mcryptd_hash_ctx *ctx   = crypto_ahash_ctx(parent);
+        struct crypto_shash *child = ctx->child;
+        int err;
+
+        crypto_shash_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+        crypto_shash_set_flags(child, crypto_ahash_get_flags(parent) &
+                                      CRYPTO_TFM_REQ_MASK);
+        err = crypto_shash_setkey(child, key, keylen);
+        crypto_ahash_set_flags(parent, crypto_shash_get_flags(child) &
+                                       CRYPTO_TFM_RES_MASK);
+        return err;
+}
+
+static int mcryptd_hash_enqueue(struct ahash_request *req,
+                                crypto_completion_t complete)
+{
+        int ret;
+
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+        struct mcryptd_queue *queue =
+                mcryptd_get_queue(crypto_ahash_tfm(tfm));
+
+        rctx->complete = req->base.complete;
+        req->base.complete = complete;
+
+        ret = mcryptd_enqueue_request(queue, &req->base, rctx);
+
+        return ret;
+}
+
+static void mcryptd_hash_init(struct crypto_async_request *req_async, int err)
+{
+        struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+        struct crypto_shash *child = ctx->child;
+        struct ahash_request *req = ahash_request_cast(req_async);
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+        struct shash_desc *desc = &rctx->desc;
+
+        if (unlikely(err == -EINPROGRESS))
+                goto out;
+
+        desc->tfm = child;
+        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+        err = crypto_shash_init(desc);
+
+        req->base.complete = rctx->complete;
+
+out:
+        local_bh_disable();
+        rctx->complete(&req->base, err);
+        local_bh_enable();
+}
+
+static int mcryptd_hash_init_enqueue(struct ahash_request *req)
+{
+        return mcryptd_hash_enqueue(req, mcryptd_hash_init);
+}
+
+static void mcryptd_hash_update(struct crypto_async_request *req_async, int err)
+{
+        struct ahash_request *req = ahash_request_cast(req_async);
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+        if (unlikely(err == -EINPROGRESS))
+                goto out;
+
+        err = shash_ahash_mcryptd_update(req, &rctx->desc);
+        if (err) {
+                req->base.complete = rctx->complete;
+                goto out;
+        }
+
+        return;
+out:
+        local_bh_disable();
+        rctx->complete(&req->base, err);
+        local_bh_enable();
+}
+
+static int mcryptd_hash_update_enqueue(struct ahash_request *req)
+{
+        return mcryptd_hash_enqueue(req, mcryptd_hash_update);
+}
+
+static void mcryptd_hash_final(struct crypto_async_request *req_async, int err)
+{
+        struct ahash_request *req = ahash_request_cast(req_async);
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+        if (unlikely(err == -EINPROGRESS))
+                goto out;
+
+        err = shash_ahash_mcryptd_final(req, &rctx->desc);
+        if (err) {
+                req->base.complete = rctx->complete;
+                goto out;
+        }
+
+        return;
+out:
+        local_bh_disable();
+        rctx->complete(&req->base, err);
+        local_bh_enable();
+}
+
+static int mcryptd_hash_final_enqueue(struct ahash_request *req)
+{
+        return mcryptd_hash_enqueue(req, mcryptd_hash_final);
+}
+
+static void mcryptd_hash_finup(struct crypto_async_request *req_async, int err)
+{
+        struct ahash_request *req = ahash_request_cast(req_async);
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+        if (unlikely(err == -EINPROGRESS))
+                goto out;
+
+        err = shash_ahash_mcryptd_finup(req, &rctx->desc);
+
+        if (err) {
+                req->base.complete = rctx->complete;
+                goto out;
+        }
+
+        return;
+out:
+        local_bh_disable();
+        rctx->complete(&req->base, err);
+        local_bh_enable();
+}
+
+static int mcryptd_hash_finup_enqueue(struct ahash_request *req)
+{
+        return mcryptd_hash_enqueue(req, mcryptd_hash_finup);
+}
+
+static void mcryptd_hash_digest(struct crypto_async_request *req_async, int err)
+{
+        struct mcryptd_hash_ctx *ctx = crypto_tfm_ctx(req_async->tfm);
+        struct crypto_shash *child = ctx->child;
+        struct ahash_request *req = ahash_request_cast(req_async);
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+        struct shash_desc *desc = &rctx->desc;
+
+        if (unlikely(err == -EINPROGRESS))
+                goto out;
+
+        desc->tfm = child;
+        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;  /* check this again */
+
+        err = shash_ahash_mcryptd_digest(req, desc);
+
+        if (err) {
+                req->base.complete = rctx->complete;
+                goto out;
+        }
+
+        return;
+out:
+        local_bh_disable();
+        rctx->complete(&req->base, err);
+        local_bh_enable();
+}
+
+static int mcryptd_hash_digest_enqueue(struct ahash_request *req)
+{
+        return mcryptd_hash_enqueue(req, mcryptd_hash_digest);
+}
+
+static int mcryptd_hash_export(struct ahash_request *req, void *out)
+{
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+        return crypto_shash_export(&rctx->desc, out);
+}
+
+static int mcryptd_hash_import(struct ahash_request *req, const void *in)
+{
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+
+        return crypto_shash_import(&rctx->desc, in);
+}
+
+static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
+                              struct mcryptd_queue *queue)
+{
+        struct hashd_instance_ctx *ctx;
+        struct ahash_instance *inst;
+        struct shash_alg *salg;
+        struct crypto_alg *alg;
+        int err;
+
+        salg = shash_attr_alg(tb[1], 0, 0);
+        if (IS_ERR(salg))
+                return PTR_ERR(salg);
+
+        alg = &salg->base;
+        pr_debug("crypto: mcryptd hash alg: %s\n", alg->cra_name);
+        inst = mcryptd_alloc_instance(alg, ahash_instance_headroom(),
+                                        sizeof(*ctx));
+        err = PTR_ERR(inst);
+        if (IS_ERR(inst))
+                goto out_put_alg;
+
+        ctx = ahash_instance_ctx(inst);
+        ctx->queue = queue;
+
+        err = crypto_init_shash_spawn(&ctx->spawn, salg,
+                                      ahash_crypto_instance(inst));
+        if (err)
+                goto out_free_inst;
+
+        inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC;
+
+        inst->alg.halg.digestsize = salg->digestsize;
+        inst->alg.halg.base.cra_ctxsize = sizeof(struct mcryptd_hash_ctx);
+
+        inst->alg.halg.base.cra_init = mcryptd_hash_init_tfm;
+        inst->alg.halg.base.cra_exit = mcryptd_hash_exit_tfm;
+
+        inst->alg.init   = mcryptd_hash_init_enqueue;
+        inst->alg.update = mcryptd_hash_update_enqueue;
+        inst->alg.final  = mcryptd_hash_final_enqueue;
+        inst->alg.finup  = mcryptd_hash_finup_enqueue;
+        inst->alg.export = mcryptd_hash_export;
+        inst->alg.import = mcryptd_hash_import;
+        inst->alg.setkey = mcryptd_hash_setkey;
+        inst->alg.digest = mcryptd_hash_digest_enqueue;
+
+        err = ahash_register_instance(tmpl, inst);
+        if (err) {
+                crypto_drop_shash(&ctx->spawn);
+out_free_inst:
+                kfree(inst);
+        }
+
+out_put_alg:
+        crypto_mod_put(alg);
+        return err;
+}
+
+static struct mcryptd_queue mqueue;
+
+static int mcryptd_create(struct crypto_template *tmpl, struct rtattr **tb)
+{
+        struct crypto_attr_type *algt;
+
+        algt = crypto_get_attr_type(tb);
+        if (IS_ERR(algt))
+                return PTR_ERR(algt);
+
+        switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
+        case CRYPTO_ALG_TYPE_DIGEST:
+                return mcryptd_create_hash(tmpl, tb, &mqueue);
+        break;
+        }
+
+        return -EINVAL;
+}
+
+static void mcryptd_free(struct crypto_instance *inst)
+{
+        struct mcryptd_instance_ctx *ctx = crypto_instance_ctx(inst);
+        struct hashd_instance_ctx *hctx = crypto_instance_ctx(inst);
+
+        switch (inst->alg.cra_flags & CRYPTO_ALG_TYPE_MASK) {
+        case CRYPTO_ALG_TYPE_AHASH:
+                crypto_drop_shash(&hctx->spawn);
+                kfree(ahash_instance(inst));
+                return;
+        default:
+                crypto_drop_spawn(&ctx->spawn);
+                kfree(inst);
+        }
+}
+
+static struct crypto_template mcryptd_tmpl = {
+        .name = "mcryptd",
+        .create = mcryptd_create,
+        .free = mcryptd_free,
+        .module = THIS_MODULE,
+};
+
+struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
+                                        u32 type, u32 mask)
+{
+        char mcryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+        struct crypto_ahash *tfm;
+
+        if (snprintf(mcryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+                     "mcryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+                return ERR_PTR(-EINVAL);
+        tfm = crypto_alloc_ahash(mcryptd_alg_name, type, mask);
+        if (IS_ERR(tfm))
+                return ERR_CAST(tfm);
+        if (tfm->base.__crt_alg->cra_module != THIS_MODULE) {
+                crypto_free_ahash(tfm);
+                return ERR_PTR(-EINVAL);
+        }
+
+        return __mcryptd_ahash_cast(tfm);
+}
+EXPORT_SYMBOL_GPL(mcryptd_alloc_ahash);
+
+int shash_ahash_mcryptd_digest(struct ahash_request *req,
+                               struct shash_desc *desc)
+{
+        int err;
+
+        err = crypto_shash_init(desc) ?:
+              shash_ahash_mcryptd_finup(req, desc);
+
+        return err;
+}
+EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_digest);
+
+int shash_ahash_mcryptd_update(struct ahash_request *req,
+                               struct shash_desc *desc)
+{
+        struct crypto_shash *tfm = desc->tfm;
+        struct shash_alg *shash = crypto_shash_alg(tfm);
+
+        /* alignment is to be done by multi-buffer crypto algorithm if needed */
+
+        return shash->update(desc, NULL, 0);
+}
+EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_update);
+
+int shash_ahash_mcryptd_finup(struct ahash_request *req,
+                              struct shash_desc *desc)
+{
+        struct crypto_shash *tfm = desc->tfm;
+        struct shash_alg *shash = crypto_shash_alg(tfm);
+
+        /* alignment is to be done by multi-buffer crypto algorithm if needed */
+
+        return shash->finup(desc, NULL, 0, req->result);
+}
+EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_finup);
+
+int shash_ahash_mcryptd_final(struct ahash_request *req,
+                              struct shash_desc *desc)
+{
+        struct crypto_shash *tfm = desc->tfm;
+        struct shash_alg *shash = crypto_shash_alg(tfm);
+
+        /* alignment is to be done by multi-buffer crypto algorithm if needed */
+
+        return shash->final(desc, req->result);
+}
+EXPORT_SYMBOL_GPL(shash_ahash_mcryptd_final);
+
+struct crypto_shash *mcryptd_ahash_child(struct mcryptd_ahash *tfm)
+{
+        struct mcryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);
+
+        return ctx->child;
+}
+EXPORT_SYMBOL_GPL(mcryptd_ahash_child);
+
+struct shash_desc *mcryptd_shash_desc(struct ahash_request *req)
+{
+        struct mcryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+        return &rctx->desc;
+}
+EXPORT_SYMBOL_GPL(mcryptd_shash_desc);
+
+void mcryptd_free_ahash(struct mcryptd_ahash *tfm)
+{
+        crypto_free_ahash(&tfm->base);
+}
+EXPORT_SYMBOL_GPL(mcryptd_free_ahash);
+
+
+static int __init mcryptd_init(void)
+{
+        int err, cpu;
+        struct mcryptd_flush_list *flist;
+
+        mcryptd_flist = alloc_percpu(struct mcryptd_flush_list);
+        for_each_possible_cpu(cpu) {
+                flist = per_cpu_ptr(mcryptd_flist, cpu);
+                INIT_LIST_HEAD(&flist->list);
+                mutex_init(&flist->lock);
+        }
+
+        err = mcryptd_init_queue(&mqueue, MCRYPTD_MAX_CPU_QLEN);
+        if (err) {
+                free_percpu(mcryptd_flist);
+                return err;
+        }
+
+        err = crypto_register_template(&mcryptd_tmpl);
+        if (err) {
+                mcryptd_fini_queue(&mqueue);
+                free_percpu(mcryptd_flist);
+        }
+
+        return err;
+}
+
+static void __exit mcryptd_exit(void)
+{
+        mcryptd_fini_queue(&mqueue);
+        crypto_unregister_template(&mcryptd_tmpl);
+        free_percpu(mcryptd_flist);
+}
+
+subsys_initcall(mcryptd_init);
+module_exit(mcryptd_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Software async multibuffer crypto daemon");