LXR linux/include/crypto/mcryptd.h

   1/*
   2 * Software async multibuffer crypto daemon headers
   3 *
   4 *    Author:
   5 *             Tim Chen <tim.c.chen@linux.intel.com>
   6 *
   7 *    Copyright (c) 2014, Intel Corporation.
   8 */
   9
  10#ifndef _CRYPTO_MCRYPT_H
  11#define _CRYPTO_MCRYPT_H
  12
  13#include <linux/crypto.h>
  14#include <linux/kernel.h>
  15#include <crypto/hash.h>
  16
  17struct mcryptd_ahash {
  18        struct crypto_ahash base;
  19};
  20
  21static inline struct mcryptd_ahash *__mcryptd_ahash_cast(
  22        struct crypto_ahash *tfm)
  23{
  24        return (struct mcryptd_ahash *)tfm;
  25}
  26
  27struct mcryptd_cpu_queue {
  28        struct crypto_queue queue;
  29        struct work_struct work;
  30};
  31
  32struct mcryptd_queue {
  33        struct mcryptd_cpu_queue __percpu *cpu_queue;
  34};
  35
  36struct mcryptd_instance_ctx {
  37        struct crypto_spawn spawn;
  38        struct mcryptd_queue *queue;
  39};
  40
  41struct mcryptd_hash_ctx {
  42        struct crypto_shash *child;
  43        struct mcryptd_alg_state *alg_state;
  44};
  45
  46struct mcryptd_tag {
  47        /* seq number of request */
  48        unsigned seq_num;
  49        /* arrival time of request */
  50        unsigned long arrival;
  51        unsigned long expire;
  52        int     cpu;
  53};
  54
  55struct mcryptd_hash_request_ctx {
  56        struct list_head waiter;
  57        crypto_completion_t complete;
  58        struct mcryptd_tag tag;
  59        struct crypto_hash_walk walk;
  60        u8 *out;
  61        int flag;
  62        struct shash_desc desc;
  63};
  64
  65struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
  66                                        u32 type, u32 mask);
  67struct crypto_shash *mcryptd_ahash_child(struct mcryptd_ahash *tfm);
  68struct shash_desc *mcryptd_shash_desc(struct ahash_request *req);
  69void mcryptd_free_ahash(struct mcryptd_ahash *tfm);
  70void mcryptd_flusher(struct work_struct *work);
  71
  72enum mcryptd_req_type {
  73        MCRYPTD_NONE,
  74        MCRYPTD_UPDATE,
  75        MCRYPTD_FINUP,
  76        MCRYPTD_DIGEST,
  77        MCRYPTD_FINAL
  78};
  79
  80struct mcryptd_alg_cstate {
  81        unsigned long next_flush;
  82        unsigned next_seq_num;
  83        bool    flusher_engaged;
  84        struct  delayed_work flush;
  85        int     cpu;
  86        struct  mcryptd_alg_state *alg_state;
  87        void    *mgr;
  88        spinlock_t work_lock;
  89        struct list_head work_list;
  90        struct list_head flush_list;
  91};
  92
  93struct mcryptd_alg_state {
  94        struct mcryptd_alg_cstate __percpu *alg_cstate;
  95        unsigned long (*flusher)(struct mcryptd_alg_cstate *cstate);
  96};
  97
  98/* return delay in jiffies from current time */
  99static inline unsigned long get_delay(unsigned long t)
 100{
 101        long delay;
 102
 103        delay = (long) t - (long) jiffies;
 104        if (delay <= 0)
 105                return 0;
 106        else
 107                return (unsigned long) delay;
 108}
 109
 110void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay);
 111
 112#endif
 113