Root/target/linux/generic-2.6/files/crypto/ocf/ixp4xx/ixp4xx.c

1/*
2 * An OCF module that uses Intels IXP CryptACC API to do the crypto.
3 * This driver requires the IXP400 Access Library that is available
4 * from Intel in order to operate (or compile).
5 *
6 * Written by David McCullough <david_mccullough@securecomputing.com>
7 * Copyright (C) 2006-2007 David McCullough
8 * Copyright (C) 2004-2005 Intel Corporation.
9 *
10 * LICENSE TERMS
11 *
12 * The free distribution and use of this software in both source and binary
13 * form is allowed (with or without changes) provided that:
14 *
15 * 1. distributions of this source code include the above copyright
16 * notice, this list of conditions and the following disclaimer;
17 *
18 * 2. distributions in binary form include the above copyright
19 * notice, this list of conditions and the following disclaimer
20 * in the documentation and/or other associated materials;
21 *
22 * 3. the copyright holder's name is not used to endorse products
23 * built using this software without specific written permission.
24 *
25 * ALTERNATIVELY, provided that this notice is retained in full, this product
26 * may be distributed under the terms of the GNU General Public License (GPL),
27 * in which case the provisions of the GPL apply INSTEAD OF those given above.
28 *
29 * DISCLAIMER
30 *
31 * This software is provided 'as is' with no explicit or implied warranties
32 * in respect of its properties, including, but not limited to, correctness
33 * and/or fitness for purpose.
34 */
35
36#ifndef AUTOCONF_INCLUDED
37#include <linux/config.h>
38#endif
39#include <linux/module.h>
40#include <linux/init.h>
41#include <linux/list.h>
42#include <linux/slab.h>
43#include <linux/sched.h>
44#include <linux/wait.h>
45#include <linux/crypto.h>
46#include <linux/interrupt.h>
47#include <asm/scatterlist.h>
48
49#include <IxTypes.h>
50#include <IxOsBuffMgt.h>
51#include <IxNpeDl.h>
52#include <IxCryptoAcc.h>
53#include <IxQMgr.h>
54#include <IxOsServices.h>
55#include <IxOsCacheMMU.h>
56
57#include <cryptodev.h>
58#include <uio.h>
59
60#ifndef IX_MBUF_PRIV
61#define IX_MBUF_PRIV(x) ((x)->priv)
62#endif
63
64struct ixp_data;
65
66struct ixp_q {
67    struct list_head ixp_q_list;
68    struct ixp_data *ixp_q_data;
69    struct cryptop *ixp_q_crp;
70    struct cryptodesc *ixp_q_ccrd;
71    struct cryptodesc *ixp_q_acrd;
72    IX_MBUF ixp_q_mbuf;
73    UINT8 *ixp_hash_dest; /* Location for hash in client buffer */
74    UINT8 *ixp_hash_src; /* Location of hash in internal buffer */
75    unsigned char ixp_q_iv_data[IX_CRYPTO_ACC_MAX_CIPHER_IV_LENGTH];
76    unsigned char *ixp_q_iv;
77};
78
79struct ixp_data {
80    int ixp_registered; /* is the context registered */
81    int ixp_crd_flags; /* detect direction changes */
82
83    int ixp_cipher_alg;
84    int ixp_auth_alg;
85
86    UINT32 ixp_ctx_id;
87    UINT32 ixp_hash_key_id; /* used when hashing */
88    IxCryptoAccCtx ixp_ctx;
89    IX_MBUF ixp_pri_mbuf;
90    IX_MBUF ixp_sec_mbuf;
91
92    struct work_struct ixp_pending_work;
93    struct work_struct ixp_registration_work;
94    struct list_head ixp_q; /* unprocessed requests */
95};
96
97#ifdef __ixp46X
98
99#define MAX_IOP_SIZE 64 /* words */
100#define MAX_OOP_SIZE 128
101
102#define MAX_PARAMS 3
103
104struct ixp_pkq {
105    struct list_head pkq_list;
106    struct cryptkop *pkq_krp;
107
108    IxCryptoAccPkeEauInOperands pkq_op;
109    IxCryptoAccPkeEauOpResult pkq_result;
110
111    UINT32 pkq_ibuf0[MAX_IOP_SIZE];
112    UINT32 pkq_ibuf1[MAX_IOP_SIZE];
113    UINT32 pkq_ibuf2[MAX_IOP_SIZE];
114    UINT32 pkq_obuf[MAX_OOP_SIZE];
115};
116
117static LIST_HEAD(ixp_pkq); /* current PK wait list */
118static struct ixp_pkq *ixp_pk_cur;
119static spinlock_t ixp_pkq_lock;
120
121#endif /* __ixp46X */
122
123static int ixp_blocked = 0;
124
125static int32_t ixp_id = -1;
126static struct ixp_data **ixp_sessions = NULL;
127static u_int32_t ixp_sesnum = 0;
128
129static int ixp_process(device_t, struct cryptop *, int);
130static int ixp_newsession(device_t, u_int32_t *, struct cryptoini *);
131static int ixp_freesession(device_t, u_int64_t);
132#ifdef __ixp46X
133static int ixp_kprocess(device_t, struct cryptkop *krp, int hint);
134#endif
135
136#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
137static kmem_cache_t *qcache;
138#else
139static struct kmem_cache *qcache;
140#endif
141
142#define debug ixp_debug
143static int ixp_debug = 0;
144module_param(ixp_debug, int, 0644);
145MODULE_PARM_DESC(ixp_debug, "Enable debug");
146
147static int ixp_init_crypto = 1;
148module_param(ixp_init_crypto, int, 0444); /* RO after load/boot */
149MODULE_PARM_DESC(ixp_init_crypto, "Call ixCryptoAccInit (default is 1)");
150
151static void ixp_process_pending(void *arg);
152static void ixp_registration(void *arg);
153#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
154static void ixp_process_pending_wq(struct work_struct *work);
155static void ixp_registration_wq(struct work_struct *work);
156#endif
157
158/*
159 * dummy device structure
160 */
161
162static struct {
163    softc_device_decl sc_dev;
164} ixpdev;
165
166static device_method_t ixp_methods = {
167    /* crypto device methods */
168    DEVMETHOD(cryptodev_newsession, ixp_newsession),
169    DEVMETHOD(cryptodev_freesession,ixp_freesession),
170    DEVMETHOD(cryptodev_process, ixp_process),
171#ifdef __ixp46X
172    DEVMETHOD(cryptodev_kprocess, ixp_kprocess),
173#endif
174};
175
176/*
177 * Generate a new software session.
178 */
179static int
180ixp_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
181{
182    struct ixp_data *ixp;
183    u_int32_t i;
184#define AUTH_LEN(cri, def) \
185    (cri->cri_mlen ? cri->cri_mlen : (def))
186
187    dprintk("%s():alg %d\n", __FUNCTION__,cri->cri_alg);
188    if (sid == NULL || cri == NULL) {
189        dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
190        return EINVAL;
191    }
192
193    if (ixp_sessions) {
194        for (i = 1; i < ixp_sesnum; i++)
195            if (ixp_sessions[i] == NULL)
196                break;
197    } else
198        i = 1; /* NB: to silence compiler warning */
199
200    if (ixp_sessions == NULL || i == ixp_sesnum) {
201        struct ixp_data **ixpd;
202
203        if (ixp_sessions == NULL) {
204            i = 1; /* We leave ixp_sessions[0] empty */
205            ixp_sesnum = CRYPTO_SW_SESSIONS;
206        } else
207            ixp_sesnum *= 2;
208
209        ixpd = kmalloc(ixp_sesnum * sizeof(struct ixp_data *), SLAB_ATOMIC);
210        if (ixpd == NULL) {
211            /* Reset session number */
212            if (ixp_sesnum == CRYPTO_SW_SESSIONS)
213                ixp_sesnum = 0;
214            else
215                ixp_sesnum /= 2;
216            dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
217            return ENOBUFS;
218        }
219        memset(ixpd, 0, ixp_sesnum * sizeof(struct ixp_data *));
220
221        /* Copy existing sessions */
222        if (ixp_sessions) {
223            memcpy(ixpd, ixp_sessions,
224                (ixp_sesnum / 2) * sizeof(struct ixp_data *));
225            kfree(ixp_sessions);
226        }
227
228        ixp_sessions = ixpd;
229    }
230
231    ixp_sessions[i] = (struct ixp_data *) kmalloc(sizeof(struct ixp_data),
232            SLAB_ATOMIC);
233    if (ixp_sessions[i] == NULL) {
234        ixp_freesession(NULL, i);
235        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
236        return ENOBUFS;
237    }
238
239    *sid = i;
240
241    ixp = ixp_sessions[i];
242    memset(ixp, 0, sizeof(*ixp));
243
244    ixp->ixp_cipher_alg = -1;
245    ixp->ixp_auth_alg = -1;
246    ixp->ixp_ctx_id = -1;
247    INIT_LIST_HEAD(&ixp->ixp_q);
248
249    ixp->ixp_ctx.useDifferentSrcAndDestMbufs = 0;
250
251    while (cri) {
252        switch (cri->cri_alg) {
253        case CRYPTO_DES_CBC:
254            ixp->ixp_cipher_alg = cri->cri_alg;
255            ixp->ixp_ctx.cipherCtx.cipherAlgo = IX_CRYPTO_ACC_CIPHER_DES;
256            ixp->ixp_ctx.cipherCtx.cipherMode = IX_CRYPTO_ACC_MODE_CBC;
257            ixp->ixp_ctx.cipherCtx.cipherKeyLen = (cri->cri_klen + 7) / 8;
258            ixp->ixp_ctx.cipherCtx.cipherBlockLen = IX_CRYPTO_ACC_DES_BLOCK_64;
259            ixp->ixp_ctx.cipherCtx.cipherInitialVectorLen =
260                        IX_CRYPTO_ACC_DES_IV_64;
261            memcpy(ixp->ixp_ctx.cipherCtx.key.cipherKey,
262                    cri->cri_key, (cri->cri_klen + 7) / 8);
263            break;
264
265        case CRYPTO_3DES_CBC:
266            ixp->ixp_cipher_alg = cri->cri_alg;
267            ixp->ixp_ctx.cipherCtx.cipherAlgo = IX_CRYPTO_ACC_CIPHER_3DES;
268            ixp->ixp_ctx.cipherCtx.cipherMode = IX_CRYPTO_ACC_MODE_CBC;
269            ixp->ixp_ctx.cipherCtx.cipherKeyLen = (cri->cri_klen + 7) / 8;
270            ixp->ixp_ctx.cipherCtx.cipherBlockLen = IX_CRYPTO_ACC_DES_BLOCK_64;
271            ixp->ixp_ctx.cipherCtx.cipherInitialVectorLen =
272                        IX_CRYPTO_ACC_DES_IV_64;
273            memcpy(ixp->ixp_ctx.cipherCtx.key.cipherKey,
274                    cri->cri_key, (cri->cri_klen + 7) / 8);
275            break;
276
277        case CRYPTO_RIJNDAEL128_CBC:
278            ixp->ixp_cipher_alg = cri->cri_alg;
279            ixp->ixp_ctx.cipherCtx.cipherAlgo = IX_CRYPTO_ACC_CIPHER_AES;
280            ixp->ixp_ctx.cipherCtx.cipherMode = IX_CRYPTO_ACC_MODE_CBC;
281            ixp->ixp_ctx.cipherCtx.cipherKeyLen = (cri->cri_klen + 7) / 8;
282            ixp->ixp_ctx.cipherCtx.cipherBlockLen = 16;
283            ixp->ixp_ctx.cipherCtx.cipherInitialVectorLen = 16;
284            memcpy(ixp->ixp_ctx.cipherCtx.key.cipherKey,
285                    cri->cri_key, (cri->cri_klen + 7) / 8);
286            break;
287
288        case CRYPTO_MD5:
289        case CRYPTO_MD5_HMAC:
290            ixp->ixp_auth_alg = cri->cri_alg;
291            ixp->ixp_ctx.authCtx.authAlgo = IX_CRYPTO_ACC_AUTH_MD5;
292            ixp->ixp_ctx.authCtx.authDigestLen = AUTH_LEN(cri, MD5_HASH_LEN);
293            ixp->ixp_ctx.authCtx.aadLen = 0;
294            /* Only MD5_HMAC needs a key */
295            if (cri->cri_alg == CRYPTO_MD5_HMAC) {
296                ixp->ixp_ctx.authCtx.authKeyLen = (cri->cri_klen + 7) / 8;
297                if (ixp->ixp_ctx.authCtx.authKeyLen >
298                        sizeof(ixp->ixp_ctx.authCtx.key.authKey)) {
299                    printk(
300                        "ixp4xx: Invalid key length for MD5_HMAC - %d bits\n",
301                            cri->cri_klen);
302                    ixp_freesession(NULL, i);
303                    return EINVAL;
304                }
305                memcpy(ixp->ixp_ctx.authCtx.key.authKey,
306                        cri->cri_key, (cri->cri_klen + 7) / 8);
307            }
308            break;
309
310        case CRYPTO_SHA1:
311        case CRYPTO_SHA1_HMAC:
312            ixp->ixp_auth_alg = cri->cri_alg;
313            ixp->ixp_ctx.authCtx.authAlgo = IX_CRYPTO_ACC_AUTH_SHA1;
314            ixp->ixp_ctx.authCtx.authDigestLen = AUTH_LEN(cri, SHA1_HASH_LEN);
315            ixp->ixp_ctx.authCtx.aadLen = 0;
316            /* Only SHA1_HMAC needs a key */
317            if (cri->cri_alg == CRYPTO_SHA1_HMAC) {
318                ixp->ixp_ctx.authCtx.authKeyLen = (cri->cri_klen + 7) / 8;
319                if (ixp->ixp_ctx.authCtx.authKeyLen >
320                        sizeof(ixp->ixp_ctx.authCtx.key.authKey)) {
321                    printk(
322                        "ixp4xx: Invalid key length for SHA1_HMAC - %d bits\n",
323                            cri->cri_klen);
324                    ixp_freesession(NULL, i);
325                    return EINVAL;
326                }
327                memcpy(ixp->ixp_ctx.authCtx.key.authKey,
328                        cri->cri_key, (cri->cri_klen + 7) / 8);
329            }
330            break;
331
332        default:
333            printk("ixp: unknown algo 0x%x\n", cri->cri_alg);
334            ixp_freesession(NULL, i);
335            return EINVAL;
336        }
337        cri = cri->cri_next;
338    }
339
340#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
341    INIT_WORK(&ixp->ixp_pending_work, ixp_process_pending_wq);
342    INIT_WORK(&ixp->ixp_registration_work, ixp_registration_wq);
343#else
344    INIT_WORK(&ixp->ixp_pending_work, ixp_process_pending, ixp);
345    INIT_WORK(&ixp->ixp_registration_work, ixp_registration, ixp);
346#endif
347
348    return 0;
349}
350
351
352/*
353 * Free a session.
354 */
355static int
356ixp_freesession(device_t dev, u_int64_t tid)
357{
358    u_int32_t sid = CRYPTO_SESID2LID(tid);
359
360    dprintk("%s()\n", __FUNCTION__);
361    if (sid > ixp_sesnum || ixp_sessions == NULL ||
362            ixp_sessions[sid] == NULL) {
363        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
364        return EINVAL;
365    }
366
367    /* Silently accept and return */
368    if (sid == 0)
369        return 0;
370
371    if (ixp_sessions[sid]) {
372        if (ixp_sessions[sid]->ixp_ctx_id != -1) {
373            ixCryptoAccCtxUnregister(ixp_sessions[sid]->ixp_ctx_id);
374            ixp_sessions[sid]->ixp_ctx_id = -1;
375        }
376
377        flush_scheduled_work();
378
379        kfree(ixp_sessions[sid]);
380    }
381    ixp_sessions[sid] = NULL;
382    if (ixp_blocked) {
383        ixp_blocked = 0;
384        crypto_unblock(ixp_id, CRYPTO_SYMQ);
385    }
386    return 0;
387}
388
389
390/*
391 * callback for when hash processing is complete
392 */
393
394static void
395ixp_hash_perform_cb(
396    UINT32 hash_key_id,
397    IX_MBUF *bufp,
398    IxCryptoAccStatus status)
399{
400    struct ixp_q *q;
401
402    dprintk("%s(%u, %p, 0x%x)\n", __FUNCTION__, hash_key_id, bufp, status);
403
404    if (bufp == NULL) {
405        printk("ixp: NULL buf in %s\n", __FUNCTION__);
406        return;
407    }
408
409    q = IX_MBUF_PRIV(bufp);
410    if (q == NULL) {
411        printk("ixp: NULL priv in %s\n", __FUNCTION__);
412        return;
413    }
414
415    if (status == IX_CRYPTO_ACC_STATUS_SUCCESS) {
416        /* On success, need to copy hash back into original client buffer */
417        memcpy(q->ixp_hash_dest, q->ixp_hash_src,
418                (q->ixp_q_data->ixp_auth_alg == CRYPTO_SHA1) ?
419                    SHA1_HASH_LEN : MD5_HASH_LEN);
420    }
421    else {
422        printk("ixp: hash perform failed status=%d\n", status);
423        q->ixp_q_crp->crp_etype = EINVAL;
424    }
425
426    /* Free internal buffer used for hashing */
427    kfree(IX_MBUF_MDATA(&q->ixp_q_mbuf));
428
429    crypto_done(q->ixp_q_crp);
430    kmem_cache_free(qcache, q);
431}
432
433/*
434 * setup a request and perform it
435 */
436static void
437ixp_q_process(struct ixp_q *q)
438{
439    IxCryptoAccStatus status;
440    struct ixp_data *ixp = q->ixp_q_data;
441    int auth_off = 0;
442    int auth_len = 0;
443    int crypt_off = 0;
444    int crypt_len = 0;
445    int icv_off = 0;
446    char *crypt_func;
447
448    dprintk("%s(%p)\n", __FUNCTION__, q);
449
450    if (q->ixp_q_ccrd) {
451        if (q->ixp_q_ccrd->crd_flags & CRD_F_IV_EXPLICIT) {
452            q->ixp_q_iv = q->ixp_q_ccrd->crd_iv;
453        } else {
454            q->ixp_q_iv = q->ixp_q_iv_data;
455            crypto_copydata(q->ixp_q_crp->crp_flags, q->ixp_q_crp->crp_buf,
456                    q->ixp_q_ccrd->crd_inject,
457                    ixp->ixp_ctx.cipherCtx.cipherInitialVectorLen,
458                    (caddr_t) q->ixp_q_iv);
459        }
460
461        if (q->ixp_q_acrd) {
462            auth_off = q->ixp_q_acrd->crd_skip;
463            auth_len = q->ixp_q_acrd->crd_len;
464            icv_off = q->ixp_q_acrd->crd_inject;
465        }
466
467        crypt_off = q->ixp_q_ccrd->crd_skip;
468        crypt_len = q->ixp_q_ccrd->crd_len;
469    } else { /* if (q->ixp_q_acrd) */
470        auth_off = q->ixp_q_acrd->crd_skip;
471        auth_len = q->ixp_q_acrd->crd_len;
472        icv_off = q->ixp_q_acrd->crd_inject;
473    }
474
475    if (q->ixp_q_crp->crp_flags & CRYPTO_F_SKBUF) {
476        struct sk_buff *skb = (struct sk_buff *) q->ixp_q_crp->crp_buf;
477        if (skb_shinfo(skb)->nr_frags) {
478            /*
479             * DAVIDM fix this limitation one day by using
480             * a buffer pool and chaining, it is not currently
481             * needed for current user/kernel space acceleration
482             */
483            printk("ixp: Cannot handle fragmented skb's yet !\n");
484            q->ixp_q_crp->crp_etype = ENOENT;
485            goto done;
486        }
487        IX_MBUF_MLEN(&q->ixp_q_mbuf) =
488                IX_MBUF_PKT_LEN(&q->ixp_q_mbuf) = skb->len;
489        IX_MBUF_MDATA(&q->ixp_q_mbuf) = skb->data;
490    } else if (q->ixp_q_crp->crp_flags & CRYPTO_F_IOV) {
491        struct uio *uiop = (struct uio *) q->ixp_q_crp->crp_buf;
492        if (uiop->uio_iovcnt != 1) {
493            /*
494             * DAVIDM fix this limitation one day by using
495             * a buffer pool and chaining, it is not currently
496             * needed for current user/kernel space acceleration
497             */
498            printk("ixp: Cannot handle more than 1 iovec yet !\n");
499            q->ixp_q_crp->crp_etype = ENOENT;
500            goto done;
501        }
502        IX_MBUF_MLEN(&q->ixp_q_mbuf) =
503                IX_MBUF_PKT_LEN(&q->ixp_q_mbuf) = uiop->uio_iov[0].iov_len;
504        IX_MBUF_MDATA(&q->ixp_q_mbuf) = uiop->uio_iov[0].iov_base;
505    } else /* contig buffer */ {
506        IX_MBUF_MLEN(&q->ixp_q_mbuf) =
507                IX_MBUF_PKT_LEN(&q->ixp_q_mbuf) = q->ixp_q_crp->crp_ilen;
508        IX_MBUF_MDATA(&q->ixp_q_mbuf) = q->ixp_q_crp->crp_buf;
509    }
510
511    IX_MBUF_PRIV(&q->ixp_q_mbuf) = q;
512
513    if (ixp->ixp_auth_alg == CRYPTO_SHA1 || ixp->ixp_auth_alg == CRYPTO_MD5) {
514        /*
515         * For SHA1 and MD5 hash, need to create an internal buffer that is big
516         * enough to hold the original data + the appropriate padding for the
517         * hash algorithm.
518         */
519        UINT8 *tbuf = NULL;
520
521        IX_MBUF_MLEN(&q->ixp_q_mbuf) = IX_MBUF_PKT_LEN(&q->ixp_q_mbuf) =
522            ((IX_MBUF_MLEN(&q->ixp_q_mbuf) * 8) + 72 + 511) / 8;
523        tbuf = kmalloc(IX_MBUF_MLEN(&q->ixp_q_mbuf), SLAB_ATOMIC);
524        
525        if (IX_MBUF_MDATA(&q->ixp_q_mbuf) == NULL) {
526            printk("ixp: kmalloc(%u, SLAB_ATOMIC) failed\n",
527                    IX_MBUF_MLEN(&q->ixp_q_mbuf));
528            q->ixp_q_crp->crp_etype = ENOMEM;
529            goto done;
530        }
531        memcpy(tbuf, &(IX_MBUF_MDATA(&q->ixp_q_mbuf))[auth_off], auth_len);
532
533        /* Set location in client buffer to copy hash into */
534        q->ixp_hash_dest =
535            &(IX_MBUF_MDATA(&q->ixp_q_mbuf))[auth_off + auth_len];
536
537        IX_MBUF_MDATA(&q->ixp_q_mbuf) = tbuf;
538
539        /* Set location in internal buffer for where hash starts */
540        q->ixp_hash_src = &(IX_MBUF_MDATA(&q->ixp_q_mbuf))[auth_len];
541
542        crypt_func = "ixCryptoAccHashPerform";
543        status = ixCryptoAccHashPerform(ixp->ixp_ctx.authCtx.authAlgo,
544                &q->ixp_q_mbuf, ixp_hash_perform_cb, 0, auth_len, auth_len,
545                &ixp->ixp_hash_key_id);
546    }
547    else {
548        crypt_func = "ixCryptoAccAuthCryptPerform";
549        status = ixCryptoAccAuthCryptPerform(ixp->ixp_ctx_id, &q->ixp_q_mbuf,
550            NULL, auth_off, auth_len, crypt_off, crypt_len, icv_off,
551            q->ixp_q_iv);
552    }
553
554    if (IX_CRYPTO_ACC_STATUS_SUCCESS == status)
555        return;
556
557    if (IX_CRYPTO_ACC_STATUS_QUEUE_FULL == status) {
558        q->ixp_q_crp->crp_etype = ENOMEM;
559        goto done;
560    }
561
562    printk("ixp: %s failed %u\n", crypt_func, status);
563    q->ixp_q_crp->crp_etype = EINVAL;
564
565done:
566    crypto_done(q->ixp_q_crp);
567    kmem_cache_free(qcache, q);
568}
569
570
571/*
572 * because we cannot process the Q from the Register callback
573 * we do it here on a task Q.
574 */
575
576static void
577ixp_process_pending(void *arg)
578{
579    struct ixp_data *ixp = arg;
580    struct ixp_q *q = NULL;
581
582    dprintk("%s(%p)\n", __FUNCTION__, arg);
583
584    if (!ixp)
585        return;
586
587    while (!list_empty(&ixp->ixp_q)) {
588        q = list_entry(ixp->ixp_q.next, struct ixp_q, ixp_q_list);
589        list_del(&q->ixp_q_list);
590        ixp_q_process(q);
591    }
592}
593
594#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
595static void
596ixp_process_pending_wq(struct work_struct *work)
597{
598    struct ixp_data *ixp = container_of(work, struct ixp_data,
599                                ixp_pending_work);
600    ixp_process_pending(ixp);
601}
602#endif
603
604/*
605 * callback for when context registration is complete
606 */
607
608static void
609ixp_register_cb(UINT32 ctx_id, IX_MBUF *bufp, IxCryptoAccStatus status)
610{
611    int i;
612    struct ixp_data *ixp;
613    struct ixp_q *q;
614
615    dprintk("%s(%d, %p, %d)\n", __FUNCTION__, ctx_id, bufp, status);
616
617    /*
618     * free any buffer passed in to this routine
619     */
620    if (bufp) {
621        IX_MBUF_MLEN(bufp) = IX_MBUF_PKT_LEN(bufp) = 0;
622        kfree(IX_MBUF_MDATA(bufp));
623        IX_MBUF_MDATA(bufp) = NULL;
624    }
625
626    for (i = 0; i < ixp_sesnum; i++) {
627        ixp = ixp_sessions[i];
628        if (ixp && ixp->ixp_ctx_id == ctx_id)
629            break;
630    }
631    if (i >= ixp_sesnum) {
632        printk("ixp: invalid context id %d\n", ctx_id);
633        return;
634    }
635
636    if (IX_CRYPTO_ACC_STATUS_WAIT == status) {
637        /* this is normal to free the first of two buffers */
638        dprintk("ixp: register not finished yet.\n");
639        return;
640    }
641
642    if (IX_CRYPTO_ACC_STATUS_SUCCESS != status) {
643        printk("ixp: register failed 0x%x\n", status);
644        while (!list_empty(&ixp->ixp_q)) {
645            q = list_entry(ixp->ixp_q.next, struct ixp_q, ixp_q_list);
646            list_del(&q->ixp_q_list);
647            q->ixp_q_crp->crp_etype = EINVAL;
648            crypto_done(q->ixp_q_crp);
649            kmem_cache_free(qcache, q);
650        }
651        return;
652    }
653
654    /*
655     * we are now registered, we cannot start processing the Q here
656     * or we get strange errors with AES (DES/3DES seem to be ok).
657     */
658    ixp->ixp_registered = 1;
659    schedule_work(&ixp->ixp_pending_work);
660}
661
662
663/*
664 * callback for when data processing is complete
665 */
666
667static void
668ixp_perform_cb(
669    UINT32 ctx_id,
670    IX_MBUF *sbufp,
671    IX_MBUF *dbufp,
672    IxCryptoAccStatus status)
673{
674    struct ixp_q *q;
675
676    dprintk("%s(%d, %p, %p, 0x%x)\n", __FUNCTION__, ctx_id, sbufp,
677            dbufp, status);
678
679    if (sbufp == NULL) {
680        printk("ixp: NULL sbuf in ixp_perform_cb\n");
681        return;
682    }
683
684    q = IX_MBUF_PRIV(sbufp);
685    if (q == NULL) {
686        printk("ixp: NULL priv in ixp_perform_cb\n");
687        return;
688    }
689
690    if (status != IX_CRYPTO_ACC_STATUS_SUCCESS) {
691        printk("ixp: perform failed status=%d\n", status);
692        q->ixp_q_crp->crp_etype = EINVAL;
693    }
694
695    crypto_done(q->ixp_q_crp);
696    kmem_cache_free(qcache, q);
697}
698
699
700/*
701 * registration is not callable at IRQ time, so we defer
702 * to a task queue, this routines completes the registration for us
703 * when the task queue runs
704 *
705 * Unfortunately this means we cannot tell OCF that the driver is blocked,
706 * we do that on the next request.
707 */
708
709static void
710ixp_registration(void *arg)
711{
712    struct ixp_data *ixp = arg;
713    struct ixp_q *q = NULL;
714    IX_MBUF *pri = NULL, *sec = NULL;
715    int status = IX_CRYPTO_ACC_STATUS_SUCCESS;
716
717    if (!ixp) {
718        printk("ixp: ixp_registration with no arg\n");
719        return;
720    }
721
722    if (ixp->ixp_ctx_id != -1) {
723        ixCryptoAccCtxUnregister(ixp->ixp_ctx_id);
724        ixp->ixp_ctx_id = -1;
725    }
726
727    if (list_empty(&ixp->ixp_q)) {
728        printk("ixp: ixp_registration with no Q\n");
729        return;
730    }
731
732    /*
733     * setup the primary and secondary buffers
734     */
735    q = list_entry(ixp->ixp_q.next, struct ixp_q, ixp_q_list);
736    if (q->ixp_q_acrd) {
737        pri = &ixp->ixp_pri_mbuf;
738        sec = &ixp->ixp_sec_mbuf;
739        IX_MBUF_MLEN(pri) = IX_MBUF_PKT_LEN(pri) = 128;
740        IX_MBUF_MDATA(pri) = (unsigned char *) kmalloc(128, SLAB_ATOMIC);
741        IX_MBUF_MLEN(sec) = IX_MBUF_PKT_LEN(sec) = 128;
742        IX_MBUF_MDATA(sec) = (unsigned char *) kmalloc(128, SLAB_ATOMIC);
743    }
744
745    /* Only need to register if a crypt op or HMAC op */
746    if (!(ixp->ixp_auth_alg == CRYPTO_SHA1 ||
747                ixp->ixp_auth_alg == CRYPTO_MD5)) {
748        status = ixCryptoAccCtxRegister(
749                    &ixp->ixp_ctx,
750                    pri, sec,
751                    ixp_register_cb,
752                    ixp_perform_cb,
753                    &ixp->ixp_ctx_id);
754    }
755    else {
756        /* Otherwise we start processing pending q */
757        schedule_work(&ixp->ixp_pending_work);
758    }
759
760    if (IX_CRYPTO_ACC_STATUS_SUCCESS == status)
761        return;
762
763    if (IX_CRYPTO_ACC_STATUS_EXCEED_MAX_TUNNELS == status) {
764        printk("ixp: ixCryptoAccCtxRegister failed (out of tunnels)\n");
765        ixp_blocked = 1;
766        /* perhaps we should return EGAIN on queued ops ? */
767        return;
768    }
769
770    printk("ixp: ixCryptoAccCtxRegister failed %d\n", status);
771    ixp->ixp_ctx_id = -1;
772
773    /*
774     * everything waiting is toasted
775     */
776    while (!list_empty(&ixp->ixp_q)) {
777        q = list_entry(ixp->ixp_q.next, struct ixp_q, ixp_q_list);
778        list_del(&q->ixp_q_list);
779        q->ixp_q_crp->crp_etype = ENOENT;
780        crypto_done(q->ixp_q_crp);
781        kmem_cache_free(qcache, q);
782    }
783}
784
785#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
786static void
787ixp_registration_wq(struct work_struct *work)
788{
789    struct ixp_data *ixp = container_of(work, struct ixp_data,
790                                ixp_registration_work);
791    ixp_registration(ixp);
792}
793#endif
794
795/*
796 * Process a request.
797 */
798static int
799ixp_process(device_t dev, struct cryptop *crp, int hint)
800{
801    struct ixp_data *ixp;
802    unsigned int lid;
803    struct ixp_q *q = NULL;
804    int status;
805
806    dprintk("%s()\n", __FUNCTION__);
807
808    /* Sanity check */
809    if (crp == NULL) {
810        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
811        return EINVAL;
812    }
813
814    crp->crp_etype = 0;
815
816    if (ixp_blocked)
817        return ERESTART;
818
819    if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
820        dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
821        crp->crp_etype = EINVAL;
822        goto done;
823    }
824
825    /*
826     * find the session we are using
827     */
828
829    lid = crp->crp_sid & 0xffffffff;
830    if (lid >= ixp_sesnum || lid == 0 || ixp_sessions == NULL ||
831            ixp_sessions[lid] == NULL) {
832        crp->crp_etype = ENOENT;
833        dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
834        goto done;
835    }
836    ixp = ixp_sessions[lid];
837
838    /*
839     * setup a new request ready for queuing
840     */
841    q = kmem_cache_alloc(qcache, SLAB_ATOMIC);
842    if (q == NULL) {
843        dprintk("%s,%d: ENOMEM\n", __FILE__, __LINE__);
844        crp->crp_etype = ENOMEM;
845        goto done;
846    }
847    /*
848     * save some cycles by only zeroing the important bits
849     */
850    memset(&q->ixp_q_mbuf, 0, sizeof(q->ixp_q_mbuf));
851    q->ixp_q_ccrd = NULL;
852    q->ixp_q_acrd = NULL;
853    q->ixp_q_crp = crp;
854    q->ixp_q_data = ixp;
855
856    /*
857     * point the cipher and auth descriptors appropriately
858     * check that we have something to do
859     */
860    if (crp->crp_desc->crd_alg == ixp->ixp_cipher_alg)
861        q->ixp_q_ccrd = crp->crp_desc;
862    else if (crp->crp_desc->crd_alg == ixp->ixp_auth_alg)
863        q->ixp_q_acrd = crp->crp_desc;
864    else {
865        crp->crp_etype = ENOENT;
866        dprintk("%s,%d: bad desc match: ENOENT\n", __FILE__, __LINE__);
867        goto done;
868    }
869    if (crp->crp_desc->crd_next) {
870        if (crp->crp_desc->crd_next->crd_alg == ixp->ixp_cipher_alg)
871            q->ixp_q_ccrd = crp->crp_desc->crd_next;
872        else if (crp->crp_desc->crd_next->crd_alg == ixp->ixp_auth_alg)
873            q->ixp_q_acrd = crp->crp_desc->crd_next;
874        else {
875            crp->crp_etype = ENOENT;
876            dprintk("%s,%d: bad desc match: ENOENT\n", __FILE__, __LINE__);
877            goto done;
878        }
879    }
880
881    /*
882     * If there is a direction change for this context then we mark it as
883     * unregistered and re-register is for the new direction. This is not
884     * a very expensive operation and currently only tends to happen when
885     * user-space application are doing benchmarks
886     *
887     * DM - we should be checking for pending requests before unregistering.
888     */
889    if (q->ixp_q_ccrd && ixp->ixp_registered &&
890            ixp->ixp_crd_flags != (q->ixp_q_ccrd->crd_flags & CRD_F_ENCRYPT)) {
891        dprintk("%s - detected direction change on session\n", __FUNCTION__);
892        ixp->ixp_registered = 0;
893    }
894
895    /*
896     * if we are registered, call straight into the perform code
897     */
898    if (ixp->ixp_registered) {
899        ixp_q_process(q);
900        return 0;
901    }
902
903    /*
904     * the only part of the context not set in newsession is the direction
905     * dependent parts
906     */
907    if (q->ixp_q_ccrd) {
908        ixp->ixp_crd_flags = (q->ixp_q_ccrd->crd_flags & CRD_F_ENCRYPT);
909        if (q->ixp_q_ccrd->crd_flags & CRD_F_ENCRYPT) {
910            ixp->ixp_ctx.operation = q->ixp_q_acrd ?
911                    IX_CRYPTO_ACC_OP_ENCRYPT_AUTH : IX_CRYPTO_ACC_OP_ENCRYPT;
912        } else {
913            ixp->ixp_ctx.operation = q->ixp_q_acrd ?
914                    IX_CRYPTO_ACC_OP_AUTH_DECRYPT : IX_CRYPTO_ACC_OP_DECRYPT;
915        }
916    } else {
917        /* q->ixp_q_acrd must be set if we are here */
918        ixp->ixp_ctx.operation = IX_CRYPTO_ACC_OP_AUTH_CALC;
919    }
920
921    status = list_empty(&ixp->ixp_q);
922    list_add_tail(&q->ixp_q_list, &ixp->ixp_q);
923    if (status)
924        schedule_work(&ixp->ixp_registration_work);
925    return 0;
926
927done:
928    if (q)
929        kmem_cache_free(qcache, q);
930    crypto_done(crp);
931    return 0;
932}
933
934
935#ifdef __ixp46X
936/*
937 * key processing support for the ixp465
938 */
939
940
941/*
942 * copy a BN (LE) into a buffer (BE) an fill out the op appropriately
943 * assume zeroed and only copy bits that are significant
944 */
945
946static int
947ixp_copy_ibuf(struct crparam *p, IxCryptoAccPkeEauOperand *op, UINT32 *buf)
948{
949    unsigned char *src = (unsigned char *) p->crp_p;
950    unsigned char *dst;
951    int len, bits = p->crp_nbits;
952
953    dprintk("%s()\n", __FUNCTION__);
954
955    if (bits > MAX_IOP_SIZE * sizeof(UINT32) * 8) {
956        dprintk("%s - ibuf too big (%d > %d)\n", __FUNCTION__,
957                bits, MAX_IOP_SIZE * sizeof(UINT32) * 8);
958        return -1;
959    }
960
961    len = (bits + 31) / 32; /* the number UINT32's needed */
962
963    dst = (unsigned char *) &buf[len];
964    dst--;
965
966    while (bits > 0) {
967        *dst-- = *src++;
968        bits -= 8;
969    }
970
971#if 0 /* no need to zero remaining bits as it is done during request alloc */
972    while (dst > (unsigned char *) buf)
973        *dst-- = '\0';
974#endif
975
976    op->pData = buf;
977    op->dataLen = len;
978    return 0;
979}
980
981/*
982 * copy out the result, be as forgiving as we can about small output buffers
983 */
984
985static int
986ixp_copy_obuf(struct crparam *p, IxCryptoAccPkeEauOpResult *op, UINT32 *buf)
987{
988    unsigned char *dst = (unsigned char *) p->crp_p;
989    unsigned char *src = (unsigned char *) buf;
990    int len, z, bits = p->crp_nbits;
991
992    dprintk("%s()\n", __FUNCTION__);
993
994    len = op->dataLen * sizeof(UINT32);
995
996    /* skip leading zeroes to be small buffer friendly */
997    z = 0;
998    while (z < len && src[z] == '\0')
999        z++;
1000
1001    src += len;
1002    src--;
1003    len -= z;
1004
1005    while (len > 0 && bits > 0) {
1006        *dst++ = *src--;
1007        len--;
1008        bits -= 8;
1009    }
1010
1011    while (bits > 0) {
1012        *dst++ = '\0';
1013        bits -= 8;
1014    }
1015
1016    if (len > 0) {
1017        dprintk("%s - obuf is %d (z=%d, ob=%d) bytes too small\n",
1018                __FUNCTION__, len, z, p->crp_nbits / 8);
1019        return -1;
1020    }
1021
1022    return 0;
1023}
1024
1025
1026/*
1027 * the parameter offsets for exp_mod
1028 */
1029
1030#define IXP_PARAM_BASE 0
1031#define IXP_PARAM_EXP 1
1032#define IXP_PARAM_MOD 2
1033#define IXP_PARAM_RES 3
1034
1035/*
1036 * key processing complete callback, is also used to start processing
1037 * by passing a NULL for pResult
1038 */
1039
1040static void
1041ixp_kperform_cb(
1042    IxCryptoAccPkeEauOperation operation,
1043    IxCryptoAccPkeEauOpResult *pResult,
1044    BOOL carryOrBorrow,
1045    IxCryptoAccStatus status)
1046{
1047    struct ixp_pkq *q, *tmp;
1048    unsigned long flags;
1049
1050    dprintk("%s(0x%x, %p, %d, 0x%x)\n", __FUNCTION__, operation, pResult,
1051            carryOrBorrow, status);
1052
1053    /* handle a completed request */
1054    if (pResult) {
1055        if (ixp_pk_cur && &ixp_pk_cur->pkq_result == pResult) {
1056            q = ixp_pk_cur;
1057            if (status != IX_CRYPTO_ACC_STATUS_SUCCESS) {
1058                dprintk("%s() - op failed 0x%x\n", __FUNCTION__, status);
1059                q->pkq_krp->krp_status = ERANGE; /* could do better */
1060            } else {
1061                /* copy out the result */
1062                if (ixp_copy_obuf(&q->pkq_krp->krp_param[IXP_PARAM_RES],
1063                        &q->pkq_result, q->pkq_obuf))
1064                    q->pkq_krp->krp_status = ERANGE;
1065            }
1066            crypto_kdone(q->pkq_krp);
1067            kfree(q);
1068            ixp_pk_cur = NULL;
1069        } else
1070            printk("%s - callback with invalid result pointer\n", __FUNCTION__);
1071    }
1072
1073    spin_lock_irqsave(&ixp_pkq_lock, flags);
1074    if (ixp_pk_cur || list_empty(&ixp_pkq)) {
1075        spin_unlock_irqrestore(&ixp_pkq_lock, flags);
1076        return;
1077    }
1078
1079    list_for_each_entry_safe(q, tmp, &ixp_pkq, pkq_list) {
1080
1081        list_del(&q->pkq_list);
1082        ixp_pk_cur = q;
1083
1084        spin_unlock_irqrestore(&ixp_pkq_lock, flags);
1085
1086        status = ixCryptoAccPkeEauPerform(
1087                IX_CRYPTO_ACC_OP_EAU_MOD_EXP,
1088                &q->pkq_op,
1089                ixp_kperform_cb,
1090                &q->pkq_result);
1091    
1092        if (status == IX_CRYPTO_ACC_STATUS_SUCCESS) {
1093            dprintk("%s() - ixCryptoAccPkeEauPerform SUCCESS\n", __FUNCTION__);
1094            return; /* callback will return here for callback */
1095        } else if (status == IX_CRYPTO_ACC_STATUS_RETRY) {
1096            printk("%s() - ixCryptoAccPkeEauPerform RETRY\n", __FUNCTION__);
1097        } else {
1098            printk("%s() - ixCryptoAccPkeEauPerform failed %d\n",
1099                    __FUNCTION__, status);
1100        }
1101        q->pkq_krp->krp_status = ERANGE; /* could do better */
1102        crypto_kdone(q->pkq_krp);
1103        kfree(q);
1104        spin_lock_irqsave(&ixp_pkq_lock, flags);
1105    }
1106    spin_unlock_irqrestore(&ixp_pkq_lock, flags);
1107}
1108
1109
1110static int
1111ixp_kprocess(device_t dev, struct cryptkop *krp, int hint)
1112{
1113    struct ixp_pkq *q;
1114    int rc = 0;
1115    unsigned long flags;
1116
1117    dprintk("%s l1=%d l2=%d l3=%d l4=%d\n", __FUNCTION__,
1118            krp->krp_param[IXP_PARAM_BASE].crp_nbits,
1119            krp->krp_param[IXP_PARAM_EXP].crp_nbits,
1120            krp->krp_param[IXP_PARAM_MOD].crp_nbits,
1121            krp->krp_param[IXP_PARAM_RES].crp_nbits);
1122
1123
1124    if (krp->krp_op != CRK_MOD_EXP) {
1125        krp->krp_status = EOPNOTSUPP;
1126        goto err;
1127    }
1128
1129    q = (struct ixp_pkq *) kmalloc(sizeof(*q), GFP_KERNEL);
1130    if (q == NULL) {
1131        krp->krp_status = ENOMEM;
1132        goto err;
1133    }
1134
1135    /*
1136     * The PKE engine does not appear to zero the output buffer
1137     * appropriately, so we need to do it all here.
1138     */
1139    memset(q, 0, sizeof(*q));
1140
1141    q->pkq_krp = krp;
1142    INIT_LIST_HEAD(&q->pkq_list);
1143
1144    if (ixp_copy_ibuf(&krp->krp_param[IXP_PARAM_BASE], &q->pkq_op.modExpOpr.M,
1145            q->pkq_ibuf0))
1146        rc = 1;
1147    if (!rc && ixp_copy_ibuf(&krp->krp_param[IXP_PARAM_EXP],
1148                &q->pkq_op.modExpOpr.e, q->pkq_ibuf1))
1149        rc = 2;
1150    if (!rc && ixp_copy_ibuf(&krp->krp_param[IXP_PARAM_MOD],
1151                &q->pkq_op.modExpOpr.N, q->pkq_ibuf2))
1152        rc = 3;
1153
1154    if (rc) {
1155        kfree(q);
1156        krp->krp_status = ERANGE;
1157        goto err;
1158    }
1159
1160    q->pkq_result.pData = q->pkq_obuf;
1161    q->pkq_result.dataLen =
1162            (krp->krp_param[IXP_PARAM_RES].crp_nbits + 31) / 32;
1163
1164    spin_lock_irqsave(&ixp_pkq_lock, flags);
1165    list_add_tail(&q->pkq_list, &ixp_pkq);
1166    spin_unlock_irqrestore(&ixp_pkq_lock, flags);
1167
1168    if (!ixp_pk_cur)
1169        ixp_kperform_cb(0, NULL, 0, 0);
1170    return (0);
1171
1172err:
1173    crypto_kdone(krp);
1174    return (0);
1175}
1176
1177
1178
1179#ifdef CONFIG_OCF_RANDOMHARVEST
1180/*
1181 * We run the random number generator output through SHA so that it
1182 * is FIPS compliant.
1183 */
1184
1185static volatile int sha_done = 0;
1186static unsigned char sha_digest[20];
1187
1188static void
1189ixp_hash_cb(UINT8 *digest, IxCryptoAccStatus status)
1190{
1191    dprintk("%s(%p, %d)\n", __FUNCTION__, digest, status);
1192    if (sha_digest != digest)
1193        printk("digest error\n");
1194    if (IX_CRYPTO_ACC_STATUS_SUCCESS == status)
1195        sha_done = 1;
1196    else
1197        sha_done = -status;
1198}
1199
1200static int
1201ixp_read_random(void *arg, u_int32_t *buf, int maxwords)
1202{
1203    IxCryptoAccStatus status;
1204    int i, n, rc;
1205
1206    dprintk("%s(%p, %d)\n", __FUNCTION__, buf, maxwords);
1207    memset(buf, 0, maxwords * sizeof(*buf));
1208    status = ixCryptoAccPkePseudoRandomNumberGet(maxwords, buf);
1209    if (status != IX_CRYPTO_ACC_STATUS_SUCCESS) {
1210        dprintk("%s: ixCryptoAccPkePseudoRandomNumberGet failed %d\n",
1211                __FUNCTION__, status);
1212        return 0;
1213    }
1214
1215    /*
1216     * run the random data through SHA to make it look more random
1217     */
1218
1219    n = sizeof(sha_digest); /* process digest bytes at a time */
1220
1221    rc = 0;
1222    for (i = 0; i < maxwords; i += n / sizeof(*buf)) {
1223        if ((maxwords - i) * sizeof(*buf) < n)
1224            n = (maxwords - i) * sizeof(*buf);
1225        sha_done = 0;
1226        status = ixCryptoAccPkeHashPerform(IX_CRYPTO_ACC_AUTH_SHA1,
1227                (UINT8 *) &buf[i], n, ixp_hash_cb, sha_digest);
1228        if (status != IX_CRYPTO_ACC_STATUS_SUCCESS) {
1229            dprintk("ixCryptoAccPkeHashPerform failed %d\n", status);
1230            return -EIO;
1231        }
1232        while (!sha_done)
1233            schedule();
1234        if (sha_done < 0) {
1235            dprintk("ixCryptoAccPkeHashPerform failed CB %d\n", -sha_done);
1236            return 0;
1237        }
1238        memcpy(&buf[i], sha_digest, n);
1239        rc += n / sizeof(*buf);;
1240    }
1241
1242    return rc;
1243}
1244#endif /* CONFIG_OCF_RANDOMHARVEST */
1245
1246#endif /* __ixp46X */
1247
1248
1249
1250/*
1251 * our driver startup and shutdown routines
1252 */
1253
1254static int
1255ixp_init(void)
1256{
1257    dprintk("%s(%p)\n", __FUNCTION__, ixp_init);
1258
1259    if (ixp_init_crypto && ixCryptoAccInit() != IX_CRYPTO_ACC_STATUS_SUCCESS)
1260        printk("ixCryptoAccInit failed, assuming already initialised!\n");
1261
1262    qcache = kmem_cache_create("ixp4xx_q", sizeof(struct ixp_q), 0,
1263                SLAB_HWCACHE_ALIGN, NULL
1264#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1265                , NULL
1266#endif
1267                  );
1268    if (!qcache) {
1269        printk("failed to create Qcache\n");
1270        return -ENOENT;
1271    }
1272
1273    memset(&ixpdev, 0, sizeof(ixpdev));
1274    softc_device_init(&ixpdev, "ixp4xx", 0, ixp_methods);
1275
1276    ixp_id = crypto_get_driverid(softc_get_device(&ixpdev),
1277                CRYPTOCAP_F_HARDWARE);
1278    if (ixp_id < 0)
1279        panic("IXP/OCF crypto device cannot initialize!");
1280
1281#define REGISTER(alg) \
1282    crypto_register(ixp_id,alg,0,0)
1283
1284    REGISTER(CRYPTO_DES_CBC);
1285    REGISTER(CRYPTO_3DES_CBC);
1286    REGISTER(CRYPTO_RIJNDAEL128_CBC);
1287#ifdef CONFIG_OCF_IXP4XX_SHA1_MD5
1288    REGISTER(CRYPTO_MD5);
1289    REGISTER(CRYPTO_SHA1);
1290#endif
1291    REGISTER(CRYPTO_MD5_HMAC);
1292    REGISTER(CRYPTO_SHA1_HMAC);
1293#undef REGISTER
1294
1295#ifdef __ixp46X
1296    spin_lock_init(&ixp_pkq_lock);
1297    /*
1298     * we do not enable the go fast options here as they can potentially
1299     * allow timing based attacks
1300     *
1301     * http://www.openssl.org/news/secadv_20030219.txt
1302     */
1303    ixCryptoAccPkeEauExpConfig(0, 0);
1304    crypto_kregister(ixp_id, CRK_MOD_EXP, 0);
1305#ifdef CONFIG_OCF_RANDOMHARVEST
1306    crypto_rregister(ixp_id, ixp_read_random, NULL);
1307#endif
1308#endif
1309
1310    return 0;
1311}
1312
1313static void
1314ixp_exit(void)
1315{
1316    dprintk("%s()\n", __FUNCTION__);
1317    crypto_unregister_all(ixp_id);
1318    ixp_id = -1;
1319    kmem_cache_destroy(qcache);
1320    qcache = NULL;
1321}
1322
1323module_init(ixp_init);
1324module_exit(ixp_exit);
1325
1326MODULE_LICENSE("Dual BSD/GPL");
1327MODULE_AUTHOR("David McCullough <dmccullough@cyberguard.com>");
1328MODULE_DESCRIPTION("ixp (OCF module for IXP4xx crypto)");
1329

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