*/
#include <crypto/algapi.h>
+#include <crypto/internal/hash.h>
+#include <crypto/cryptd.h>
+#include <crypto/crypto_wq.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
-#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/module.h>
-#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
-#include <linux/spinlock.h>
-#define CRYPTD_MAX_QLEN 100
+#define CRYPTD_MAX_CPU_QLEN 100
-struct cryptd_state {
- spinlock_t lock;
- struct mutex mutex;
+struct cryptd_cpu_queue {
struct crypto_queue queue;
- struct task_struct *task;
+ struct work_struct work;
+};
+
+struct cryptd_queue {
+ struct cryptd_cpu_queue *cpu_queue;
};
struct cryptd_instance_ctx {
struct crypto_spawn spawn;
- struct cryptd_state *state;
+ struct cryptd_queue *queue;
};
struct cryptd_blkcipher_ctx {
crypto_completion_t complete;
};
-static inline struct cryptd_state *cryptd_get_state(struct crypto_tfm *tfm)
+static void cryptd_queue_worker(struct work_struct *work);
+
+static int cryptd_init_queue(struct cryptd_queue *queue,
+ unsigned int max_cpu_qlen)
+{
+ int cpu;
+ struct cryptd_cpu_queue *cpu_queue;
+
+ queue->cpu_queue = alloc_percpu(struct cryptd_cpu_queue);
+ if (!queue->cpu_queue)
+ return -ENOMEM;
+ for_each_possible_cpu(cpu) {
+ cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+ crypto_init_queue(&cpu_queue->queue, max_cpu_qlen);
+ INIT_WORK(&cpu_queue->work, cryptd_queue_worker);
+ }
+ return 0;
+}
+
+static void cryptd_fini_queue(struct cryptd_queue *queue)
+{
+ int cpu;
+ struct cryptd_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 cryptd_enqueue_request(struct cryptd_queue *queue,
+ struct crypto_async_request *request)
+{
+ int cpu, err;
+ struct cryptd_cpu_queue *cpu_queue;
+
+ cpu = get_cpu();
+ cpu_queue = per_cpu_ptr(queue->cpu_queue, cpu);
+ err = crypto_enqueue_request(&cpu_queue->queue, request);
+ queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
+ put_cpu();
+
+ return err;
+}
+
+/* Called in workqueue context, do one real cryption work (via
+ * req->complete) and reschedule itself if there are more work to
+ * do. */
+static void cryptd_queue_worker(struct work_struct *work)
+{
+ struct cryptd_cpu_queue *cpu_queue;
+ struct crypto_async_request *req, *backlog;
+
+ cpu_queue = container_of(work, struct cryptd_cpu_queue, work);
+ /* Only handle one request at a time to avoid hogging crypto
+ * workqueue. preempt_disable/enable is used to prevent
+ * being preempted by cryptd_enqueue_request() */
+ preempt_disable();
+ backlog = crypto_get_backlog(&cpu_queue->queue);
+ req = crypto_dequeue_request(&cpu_queue->queue);
+ preempt_enable();
+
+ if (!req)
+ return;
+
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+ req->complete(req, 0);
+
+ if (cpu_queue->queue.qlen)
+ queue_work(kcrypto_wq, &cpu_queue->work);
+}
+
+static inline struct cryptd_queue *cryptd_get_queue(struct crypto_tfm *tfm)
{
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
struct cryptd_instance_ctx *ictx = crypto_instance_ctx(inst);
- return ictx->state;
+ return ictx->queue;
}
static int cryptd_blkcipher_setkey(struct crypto_ablkcipher *parent,
{
struct cryptd_blkcipher_request_ctx *rctx = ablkcipher_request_ctx(req);
struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
- struct cryptd_state *state =
- cryptd_get_state(crypto_ablkcipher_tfm(tfm));
- int err;
+ struct cryptd_queue *queue;
+ queue = cryptd_get_queue(crypto_ablkcipher_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = complete;
- spin_lock_bh(&state->lock);
- err = ablkcipher_enqueue_request(&state->queue, req);
- spin_unlock_bh(&state->lock);
-
- wake_up_process(state->task);
- return err;
+ return cryptd_enqueue_request(queue, &req->base);
}
static int cryptd_blkcipher_encrypt_enqueue(struct ablkcipher_request *req)
static void cryptd_blkcipher_exit_tfm(struct crypto_tfm *tfm)
{
struct cryptd_blkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
- struct cryptd_state *state = cryptd_get_state(tfm);
- int active;
-
- mutex_lock(&state->mutex);
- active = ablkcipher_tfm_in_queue(&state->queue,
- __crypto_ablkcipher_cast(tfm));
- mutex_unlock(&state->mutex);
-
- BUG_ON(active);
crypto_free_blkcipher(ctx->child);
}
static struct crypto_instance *cryptd_alloc_instance(struct crypto_alg *alg,
- struct cryptd_state *state)
+ struct cryptd_queue *queue)
{
struct crypto_instance *inst;
struct cryptd_instance_ctx *ctx;
if (err)
goto out_free_inst;
- ctx->state = state;
+ ctx->queue = queue;
memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
}
static struct crypto_instance *cryptd_alloc_blkcipher(
- struct rtattr **tb, struct cryptd_state *state)
+ struct rtattr **tb, struct cryptd_queue *queue)
{
struct crypto_instance *inst;
struct crypto_alg *alg;
if (IS_ERR(alg))
return ERR_CAST(alg);
- inst = cryptd_alloc_instance(alg, state);
+ inst = cryptd_alloc_instance(alg, queue);
if (IS_ERR(inst))
goto out_put_alg;
static void cryptd_hash_exit_tfm(struct crypto_tfm *tfm)
{
struct cryptd_hash_ctx *ctx = crypto_tfm_ctx(tfm);
- struct cryptd_state *state = cryptd_get_state(tfm);
- int active;
-
- mutex_lock(&state->mutex);
- active = ahash_tfm_in_queue(&state->queue,
- __crypto_ahash_cast(tfm));
- mutex_unlock(&state->mutex);
-
- BUG_ON(active);
crypto_free_hash(ctx->child);
}
{
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
- struct cryptd_state *state =
- cryptd_get_state(crypto_ahash_tfm(tfm));
- int err;
+ struct cryptd_queue *queue =
+ cryptd_get_queue(crypto_ahash_tfm(tfm));
rctx->complete = req->base.complete;
req->base.complete = complete;
- spin_lock_bh(&state->lock);
- err = ahash_enqueue_request(&state->queue, req);
- spin_unlock_bh(&state->lock);
-
- wake_up_process(state->task);
- return err;
+ return cryptd_enqueue_request(queue, &req->base);
}
static void cryptd_hash_init(struct crypto_async_request *req_async, int err)
}
static struct crypto_instance *cryptd_alloc_hash(
- struct rtattr **tb, struct cryptd_state *state)
+ struct rtattr **tb, struct cryptd_queue *queue)
{
struct crypto_instance *inst;
struct crypto_alg *alg;
if (IS_ERR(alg))
return ERR_PTR(PTR_ERR(alg));
- inst = cryptd_alloc_instance(alg, state);
+ inst = cryptd_alloc_instance(alg, queue);
if (IS_ERR(inst))
goto out_put_alg;
return inst;
}
-static struct cryptd_state state;
+static struct cryptd_queue queue;
static struct crypto_instance *cryptd_alloc(struct rtattr **tb)
{
switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_BLKCIPHER:
- return cryptd_alloc_blkcipher(tb, &state);
+ return cryptd_alloc_blkcipher(tb, &queue);
case CRYPTO_ALG_TYPE_DIGEST:
- return cryptd_alloc_hash(tb, &state);
+ return cryptd_alloc_hash(tb, &queue);
}
return ERR_PTR(-EINVAL);
.module = THIS_MODULE,
};
-static inline int cryptd_create_thread(struct cryptd_state *state,
- int (*fn)(void *data), const char *name)
-{
- spin_lock_init(&state->lock);
- mutex_init(&state->mutex);
- crypto_init_queue(&state->queue, CRYPTD_MAX_QLEN);
-
- state->task = kthread_run(fn, state, name);
- if (IS_ERR(state->task))
- return PTR_ERR(state->task);
+struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
+ u32 type, u32 mask)
+{
+ char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];
+ struct crypto_ablkcipher *tfm;
+
+ if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
+ "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-EINVAL);
+ tfm = crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);
+ if (IS_ERR(tfm))
+ return ERR_CAST(tfm);
+ if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {
+ crypto_free_ablkcipher(tfm);
+ return ERR_PTR(-EINVAL);
+ }
- return 0;
+ return __cryptd_ablkcipher_cast(tfm);
}
+EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);
-static inline void cryptd_stop_thread(struct cryptd_state *state)
+struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)
{
- BUG_ON(state->queue.qlen);
- kthread_stop(state->task);
+ struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);
+ return ctx->child;
}
+EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);
-static int cryptd_thread(void *data)
+void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)
{
- struct cryptd_state *state = data;
- int stop;
-
- current->flags |= PF_NOFREEZE;
-
- do {
- struct crypto_async_request *req, *backlog;
-
- mutex_lock(&state->mutex);
- __set_current_state(TASK_INTERRUPTIBLE);
-
- spin_lock_bh(&state->lock);
- backlog = crypto_get_backlog(&state->queue);
- req = crypto_dequeue_request(&state->queue);
- spin_unlock_bh(&state->lock);
-
- stop = kthread_should_stop();
-
- if (stop || req) {
- __set_current_state(TASK_RUNNING);
- if (req) {
- if (backlog)
- backlog->complete(backlog,
- -EINPROGRESS);
- req->complete(req, 0);
- }
- }
-
- mutex_unlock(&state->mutex);
-
- schedule();
- } while (!stop);
-
- return 0;
+ crypto_free_ablkcipher(&tfm->base);
}
+EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);
static int __init cryptd_init(void)
{
int err;
- err = cryptd_create_thread(&state, cryptd_thread, "cryptd");
+ err = cryptd_init_queue(&queue, CRYPTD_MAX_CPU_QLEN);
if (err)
return err;
err = crypto_register_template(&cryptd_tmpl);
if (err)
- kthread_stop(state.task);
+ cryptd_fini_queue(&queue);
return err;
}
static void __exit cryptd_exit(void)
{
- cryptd_stop_thread(&state);
+ cryptd_fini_queue(&queue);
crypto_unregister_template(&cryptd_tmpl);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff