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
  17 struct mcryptd_ahash {
  18         struct crypto_ahash base;
  19 };
  20
  21 static inline struct mcryptd_ahash *__mcryptd_ahash_cast(
  22         struct crypto_ahash *tfm)
  23 {
  24         return (struct mcryptd_ahash *)tfm;
  25 }
  26
  27 struct mcryptd_cpu_queue {
  28         struct crypto_queue queue;
  29         spinlock_t q_lock;
  30         struct work_struct work;
  31 };
  32
  33 struct mcryptd_queue {
  34         struct mcryptd_cpu_queue __percpu *cpu_queue;
  35 };
  36
  37 struct mcryptd_instance_ctx {
  38         struct crypto_spawn spawn;
  39         struct mcryptd_queue *queue;
  40 };
  41
  42 struct mcryptd_hash_ctx {
  43         struct crypto_ahash *child;
  44         struct mcryptd_alg_state *alg_state;
  45 };
  46
  47 struct mcryptd_tag {
  48         /* seq number of request */
  49         unsigned seq_num;
  50         /* arrival time of request */
  51         unsigned long arrival;
  52         unsigned long expire;
  53         int     cpu;
  54 };
  55
  56 struct mcryptd_hash_request_ctx {
  57         struct list_head waiter;
  58         crypto_completion_t complete;
  59         struct mcryptd_tag tag;
  60         struct crypto_hash_walk walk;
  61         u8 *out;
  62         int flag;
  63         struct ahash_request areq;
  64 };
  65
  66 struct mcryptd_ahash *mcryptd_alloc_ahash(const char *alg_name,
  67                                         u32 type, u32 mask);
  68 struct crypto_ahash *mcryptd_ahash_child(struct mcryptd_ahash *tfm);
  69 struct ahash_request *mcryptd_ahash_desc(struct ahash_request *req);
  70 void mcryptd_free_ahash(struct mcryptd_ahash *tfm);
  71 void mcryptd_flusher(struct work_struct *work);
  72
  73 enum mcryptd_req_type {
  74         MCRYPTD_NONE,
  75         MCRYPTD_UPDATE,
  76         MCRYPTD_FINUP,
  77         MCRYPTD_DIGEST,
  78         MCRYPTD_FINAL
  79 };
  80
  81 struct mcryptd_alg_cstate {
  82         unsigned long next_flush;
  83         unsigned next_seq_num;
  84         bool    flusher_engaged;
  85         struct  delayed_work flush;
  86         int     cpu;
  87         struct  mcryptd_alg_state *alg_state;
  88         void    *mgr;
  89         spinlock_t work_lock;
  90         struct list_head work_list;
  91         struct list_head flush_list;
  92 };
  93
  94 struct mcryptd_alg_state {
  95         struct mcryptd_alg_cstate __percpu *alg_cstate;
  96         unsigned long (*flusher)(struct mcryptd_alg_cstate *cstate);
  97 };
  98
  99 /* return delay in jiffies from current time */
 100 static inline unsigned long get_delay(unsigned long t)
 101 {
 102         long delay;
 103
 104         delay = (long) t - (long) jiffies;
 105         if (delay <= 0)
 106                 return 0;
 107         else
 108                 return (unsigned long) delay;
 109 }
 110
 111 void mcryptd_arm_flusher(struct mcryptd_alg_cstate *cstate, unsigned long delay);
 112
 113 #endif