drivers/crypto/ixp4xx_crypto.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel IXP4xx NPE-C crypto driver
   4  *
   5  * Copyright (C) 2008 Christian Hohnstaedt <chohnstaedt@innominate.com>
   6  */
   7
   8 #include <linux/platform_device.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/crypto.h>
  12 #include <linux/kernel.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/gfp.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19
  20 #include <crypto/ctr.h>
  21 #include <crypto/internal/des.h>
  22 #include <crypto/aes.h>
  23 #include <crypto/hmac.h>
  24 #include <crypto/sha1.h>
  25 #include <crypto/algapi.h>
  26 #include <crypto/internal/aead.h>
  27 #include <crypto/internal/skcipher.h>
  28 #include <crypto/authenc.h>
  29 #include <crypto/scatterwalk.h>
  30
  31 #include <linux/soc/ixp4xx/npe.h>
  32 #include <linux/soc/ixp4xx/qmgr.h>
  33
  34 /* Intermittent includes, delete this after v5.14-rc1 */
  35 #include <linux/soc/ixp4xx/cpu.h>
  36
  37 #define MAX_KEYLEN 32
  38
  39 /* hash: cfgword + 2 * digestlen; crypt: keylen + cfgword */
  40 #define NPE_CTX_LEN 80
  41 #define AES_BLOCK128 16
  42
  43 #define NPE_OP_HASH_VERIFY   0x01
  44 #define NPE_OP_CCM_ENABLE    0x04
  45 #define NPE_OP_CRYPT_ENABLE  0x08
  46 #define NPE_OP_HASH_ENABLE   0x10
  47 #define NPE_OP_NOT_IN_PLACE  0x20
  48 #define NPE_OP_HMAC_DISABLE  0x40
  49 #define NPE_OP_CRYPT_ENCRYPT 0x80
  50
  51 #define NPE_OP_CCM_GEN_MIC   0xcc
  52 #define NPE_OP_HASH_GEN_ICV  0x50
  53 #define NPE_OP_ENC_GEN_KEY   0xc9
  54
  55 #define MOD_ECB     0x0000
  56 #define MOD_CTR     0x1000
  57 #define MOD_CBC_ENC 0x2000
  58 #define MOD_CBC_DEC 0x3000
  59 #define MOD_CCM_ENC 0x4000
  60 #define MOD_CCM_DEC 0x5000
  61
  62 #define KEYLEN_128  4
  63 #define KEYLEN_192  6
  64 #define KEYLEN_256  8
  65
  66 #define CIPH_DECR   0x0000
  67 #define CIPH_ENCR   0x0400
  68
  69 #define MOD_DES     0x0000
  70 #define MOD_TDEA2   0x0100
  71 #define MOD_3DES   0x0200
  72 #define MOD_AES     0x0800
  73 #define MOD_AES128  (0x0800 | KEYLEN_128)
  74 #define MOD_AES192  (0x0900 | KEYLEN_192)
  75 #define MOD_AES256  (0x0a00 | KEYLEN_256)
  76
  77 #define MAX_IVLEN   16
  78 #define NPE_QLEN    16
  79 /* Space for registering when the first
  80  * NPE_QLEN crypt_ctl are busy */
  81 #define NPE_QLEN_TOTAL 64
  82
  83 #define CTL_FLAG_UNUSED         0x0000
  84 #define CTL_FLAG_USED           0x1000
  85 #define CTL_FLAG_PERFORM_ABLK   0x0001
  86 #define CTL_FLAG_GEN_ICV        0x0002
  87 #define CTL_FLAG_GEN_REVAES     0x0004
  88 #define CTL_FLAG_PERFORM_AEAD   0x0008
  89 #define CTL_FLAG_MASK           0x000f
  90
  91 #define HMAC_PAD_BLOCKLEN SHA1_BLOCK_SIZE
  92
  93 #define MD5_DIGEST_SIZE   16
  94
  95 struct buffer_desc {
  96         u32 phys_next;
  97 #ifdef __ARMEB__
  98         u16 buf_len;
  99         u16 pkt_len;
 100 #else
 101         u16 pkt_len;
 102         u16 buf_len;
 103 #endif
 104         dma_addr_t phys_addr;
 105         u32 __reserved[4];
 106         struct buffer_desc *next;
 107         enum dma_data_direction dir;
 108 };
 109
 110 struct crypt_ctl {
 111 #ifdef __ARMEB__
 112         u8 mode;                /* NPE_OP_*  operation mode */
 113         u8 init_len;
 114         u16 reserved;
 115 #else
 116         u16 reserved;
 117         u8 init_len;
 118         u8 mode;                /* NPE_OP_*  operation mode */
 119 #endif
 120         u8 iv[MAX_IVLEN];       /* IV for CBC mode or CTR IV for CTR mode */
 121         dma_addr_t icv_rev_aes; /* icv or rev aes */
 122         dma_addr_t src_buf;
 123         dma_addr_t dst_buf;
 124 #ifdef __ARMEB__
 125         u16 auth_offs;          /* Authentication start offset */
 126         u16 auth_len;           /* Authentication data length */
 127         u16 crypt_offs;         /* Cryption start offset */
 128         u16 crypt_len;          /* Cryption data length */
 129 #else
 130         u16 auth_len;           /* Authentication data length */
 131         u16 auth_offs;          /* Authentication start offset */
 132         u16 crypt_len;          /* Cryption data length */
 133         u16 crypt_offs;         /* Cryption start offset */
 134 #endif
 135         u32 aadAddr;            /* Additional Auth Data Addr for CCM mode */
 136         u32 crypto_ctx;         /* NPE Crypto Param structure address */
 137
 138         /* Used by Host: 4*4 bytes*/
 139         unsigned int ctl_flags;
 140         union {
 141                 struct skcipher_request *ablk_req;
 142                 struct aead_request *aead_req;
 143                 struct crypto_tfm *tfm;
 144         } data;
 145         struct buffer_desc *regist_buf;
 146         u8 *regist_ptr;
 147 };
 148
 149 struct ablk_ctx {
 150         struct buffer_desc *src;
 151         struct buffer_desc *dst;
 152         u8 iv[MAX_IVLEN];
 153         bool encrypt;
 154         struct skcipher_request fallback_req;   // keep at the end
 155 };
 156
 157 struct aead_ctx {
 158         struct buffer_desc *src;
 159         struct buffer_desc *dst;
 160         struct scatterlist ivlist;
 161         /* used when the hmac is not on one sg entry */
 162         u8 *hmac_virt;
 163         int encrypt;
 164 };
 165
 166 struct ix_hash_algo {
 167         u32 cfgword;
 168         unsigned char *icv;
 169 };
 170
 171 struct ix_sa_dir {
 172         unsigned char *npe_ctx;
 173         dma_addr_t npe_ctx_phys;
 174         int npe_ctx_idx;
 175         u8 npe_mode;
 176 };
 177
 178 struct ixp_ctx {
 179         struct ix_sa_dir encrypt;
 180         struct ix_sa_dir decrypt;
 181         int authkey_len;
 182         u8 authkey[MAX_KEYLEN];
 183         int enckey_len;
 184         u8 enckey[MAX_KEYLEN];
 185         u8 salt[MAX_IVLEN];
 186         u8 nonce[CTR_RFC3686_NONCE_SIZE];
 187         unsigned int salted;
 188         atomic_t configuring;
 189         struct completion completion;
 190         struct crypto_skcipher *fallback_tfm;
 191 };
 192
 193 struct ixp_alg {
 194         struct skcipher_alg crypto;
 195         const struct ix_hash_algo *hash;
 196         u32 cfg_enc;
 197         u32 cfg_dec;
 198
 199         int registered;
 200 };
 201
 202 struct ixp_aead_alg {
 203         struct aead_alg crypto;
 204         const struct ix_hash_algo *hash;
 205         u32 cfg_enc;
 206         u32 cfg_dec;
 207
 208         int registered;
 209 };
 210
 211 static const struct ix_hash_algo hash_alg_md5 = {
 212         .cfgword        = 0xAA010004,
 213         .icv            = "\x01\x23\x45\x67\x89\xAB\xCD\xEF"
 214                           "\xFE\xDC\xBA\x98\x76\x54\x32\x10",
 215 };
 216
 217 static const struct ix_hash_algo hash_alg_sha1 = {
 218         .cfgword        = 0x00000005,
 219         .icv            = "\x67\x45\x23\x01\xEF\xCD\xAB\x89\x98\xBA"
 220                           "\xDC\xFE\x10\x32\x54\x76\xC3\xD2\xE1\xF0",
 221 };
 222
 223 static struct npe *npe_c;
 224
 225 static unsigned int send_qid;
 226 static unsigned int recv_qid;
 227 static struct dma_pool *buffer_pool;
 228 static struct dma_pool *ctx_pool;
 229
 230 static struct crypt_ctl *crypt_virt;
 231 static dma_addr_t crypt_phys;
 232
 233 static int support_aes = 1;
 234
 235 static struct platform_device *pdev;
 236
 237 static inline dma_addr_t crypt_virt2phys(struct crypt_ctl *virt)
 238 {
 239         return crypt_phys + (virt - crypt_virt) * sizeof(struct crypt_ctl);
 240 }
 241
 242 static inline struct crypt_ctl *crypt_phys2virt(dma_addr_t phys)
 243 {
 244         return crypt_virt + (phys - crypt_phys) / sizeof(struct crypt_ctl);
 245 }
 246
 247 static inline u32 cipher_cfg_enc(struct crypto_tfm *tfm)
 248 {
 249         return container_of(tfm->__crt_alg, struct ixp_alg, crypto.base)->cfg_enc;
 250 }
 251
 252 static inline u32 cipher_cfg_dec(struct crypto_tfm *tfm)
 253 {
 254         return container_of(tfm->__crt_alg, struct ixp_alg, crypto.base)->cfg_dec;
 255 }
 256
 257 static inline const struct ix_hash_algo *ix_hash(struct crypto_tfm *tfm)
 258 {
 259         return container_of(tfm->__crt_alg, struct ixp_alg, crypto.base)->hash;
 260 }
 261
 262 static int setup_crypt_desc(void)
 263 {
 264         struct device *dev = &pdev->dev;
 265
 266         BUILD_BUG_ON(sizeof(struct crypt_ctl) != 64);
 267         crypt_virt = dma_alloc_coherent(dev,
 268                                         NPE_QLEN * sizeof(struct crypt_ctl),
 269                                         &crypt_phys, GFP_ATOMIC);
 270         if (!crypt_virt)
 271                 return -ENOMEM;
 272         return 0;
 273 }
 274
 275 static DEFINE_SPINLOCK(desc_lock);
 276 static struct crypt_ctl *get_crypt_desc(void)
 277 {
 278         int i;
 279         static int idx;
 280         unsigned long flags;
 281
 282         spin_lock_irqsave(&desc_lock, flags);
 283
 284         if (unlikely(!crypt_virt))
 285                 setup_crypt_desc();
 286         if (unlikely(!crypt_virt)) {
 287                 spin_unlock_irqrestore(&desc_lock, flags);
 288                 return NULL;
 289         }
 290         i = idx;
 291         if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
 292                 if (++idx >= NPE_QLEN)
 293                         idx = 0;
 294                 crypt_virt[i].ctl_flags = CTL_FLAG_USED;
 295                 spin_unlock_irqrestore(&desc_lock, flags);
 296                 return crypt_virt + i;
 297         } else {
 298                 spin_unlock_irqrestore(&desc_lock, flags);
 299                 return NULL;
 300         }
 301 }
 302
 303 static DEFINE_SPINLOCK(emerg_lock);
 304 static struct crypt_ctl *get_crypt_desc_emerg(void)
 305 {
 306         int i;
 307         static int idx = NPE_QLEN;
 308         struct crypt_ctl *desc;
 309         unsigned long flags;
 310
 311         desc = get_crypt_desc();
 312         if (desc)
 313                 return desc;
 314         if (unlikely(!crypt_virt))
 315                 return NULL;
 316
 317         spin_lock_irqsave(&emerg_lock, flags);
 318         i = idx;
 319         if (crypt_virt[i].ctl_flags == CTL_FLAG_UNUSED) {
 320                 if (++idx >= NPE_QLEN_TOTAL)
 321                         idx = NPE_QLEN;
 322                 crypt_virt[i].ctl_flags = CTL_FLAG_USED;
 323                 spin_unlock_irqrestore(&emerg_lock, flags);
 324                 return crypt_virt + i;
 325         } else {
 326                 spin_unlock_irqrestore(&emerg_lock, flags);
 327                 return NULL;
 328         }
 329 }
 330
 331 static void free_buf_chain(struct device *dev, struct buffer_desc *buf,
 332                            dma_addr_t phys)
 333 {
 334         while (buf) {
 335                 struct buffer_desc *buf1;
 336                 u32 phys1;
 337
 338                 buf1 = buf->next;
 339                 phys1 = buf->phys_next;
 340                 dma_unmap_single(dev, buf->phys_addr, buf->buf_len, buf->dir);
 341                 dma_pool_free(buffer_pool, buf, phys);
 342                 buf = buf1;
 343                 phys = phys1;
 344         }
 345 }
 346
 347 static struct tasklet_struct crypto_done_tasklet;
 348
 349 static void finish_scattered_hmac(struct crypt_ctl *crypt)
 350 {
 351         struct aead_request *req = crypt->data.aead_req;
 352         struct aead_ctx *req_ctx = aead_request_ctx(req);
 353         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 354         int authsize = crypto_aead_authsize(tfm);
 355         int decryptlen = req->assoclen + req->cryptlen - authsize;
 356
 357         if (req_ctx->encrypt) {
 358                 scatterwalk_map_and_copy(req_ctx->hmac_virt, req->dst,
 359                                          decryptlen, authsize, 1);
 360         }
 361         dma_pool_free(buffer_pool, req_ctx->hmac_virt, crypt->icv_rev_aes);
 362 }
 363
 364 static void one_packet(dma_addr_t phys)
 365 {
 366         struct device *dev = &pdev->dev;
 367         struct crypt_ctl *crypt;
 368         struct ixp_ctx *ctx;
 369         int failed;
 370
 371         failed = phys & 0x1 ? -EBADMSG : 0;
 372         phys &= ~0x3;
 373         crypt = crypt_phys2virt(phys);
 374
 375         switch (crypt->ctl_flags & CTL_FLAG_MASK) {
 376         case CTL_FLAG_PERFORM_AEAD: {
 377                 struct aead_request *req = crypt->data.aead_req;
 378                 struct aead_ctx *req_ctx = aead_request_ctx(req);
 379
 380                 free_buf_chain(dev, req_ctx->src, crypt->src_buf);
 381                 free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
 382                 if (req_ctx->hmac_virt)
 383                         finish_scattered_hmac(crypt);
 384
 385                 aead_request_complete(req, failed);
 386                 break;
 387         }
 388         case CTL_FLAG_PERFORM_ABLK: {
 389                 struct skcipher_request *req = crypt->data.ablk_req;
 390                 struct ablk_ctx *req_ctx = skcipher_request_ctx(req);
 391                 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 392                 unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 393                 unsigned int offset;
 394
 395                 if (ivsize > 0) {
 396                         offset = req->cryptlen - ivsize;
 397                         if (req_ctx->encrypt) {
 398                                 scatterwalk_map_and_copy(req->iv, req->dst,
 399                                                          offset, ivsize, 0);
 400                         } else {
 401                                 memcpy(req->iv, req_ctx->iv, ivsize);
 402                                 memzero_explicit(req_ctx->iv, ivsize);
 403                         }
 404                 }
 405
 406                 if (req_ctx->dst)
 407                         free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
 408
 409                 free_buf_chain(dev, req_ctx->src, crypt->src_buf);
 410                 skcipher_request_complete(req, failed);
 411                 break;
 412         }
 413         case CTL_FLAG_GEN_ICV:
 414                 ctx = crypto_tfm_ctx(crypt->data.tfm);
 415                 dma_pool_free(ctx_pool, crypt->regist_ptr,
 416                               crypt->regist_buf->phys_addr);
 417                 dma_pool_free(buffer_pool, crypt->regist_buf, crypt->src_buf);
 418                 if (atomic_dec_and_test(&ctx->configuring))
 419                         complete(&ctx->completion);
 420                 break;
 421         case CTL_FLAG_GEN_REVAES:
 422                 ctx = crypto_tfm_ctx(crypt->data.tfm);
 423                 *(__be32 *)ctx->decrypt.npe_ctx &= cpu_to_be32(~CIPH_ENCR);
 424                 if (atomic_dec_and_test(&ctx->configuring))
 425                         complete(&ctx->completion);
 426                 break;
 427         default:
 428                 BUG();
 429         }
 430         crypt->ctl_flags = CTL_FLAG_UNUSED;
 431 }
 432
 433 static void irqhandler(void *_unused)
 434 {
 435         tasklet_schedule(&crypto_done_tasklet);
 436 }
 437
 438 static void crypto_done_action(unsigned long arg)
 439 {
 440         int i;
 441
 442         for (i = 0; i < 4; i++) {
 443                 dma_addr_t phys = qmgr_get_entry(recv_qid);
 444                 if (!phys)
 445                         return;
 446                 one_packet(phys);
 447         }
 448         tasklet_schedule(&crypto_done_tasklet);
 449 }
 450
 451 static int init_ixp_crypto(struct device *dev)
 452 {
 453         struct device_node *np = dev->of_node;
 454         u32 msg[2] = { 0, 0 };
 455         int ret = -ENODEV;
 456         u32 npe_id;
 457
 458         dev_info(dev, "probing...\n");
 459
 460         /* Locate the NPE and queue manager to use from device tree */
 461         if (IS_ENABLED(CONFIG_OF) && np) {
 462                 struct of_phandle_args queue_spec;
 463                 struct of_phandle_args npe_spec;
 464
 465                 ret = of_parse_phandle_with_fixed_args(np, "intel,npe-handle",
 466                                                        1, 0, &npe_spec);
 467                 if (ret) {
 468                         dev_err(dev, "no NPE engine specified\n");
 469                         return -ENODEV;
 470                 }
 471                 npe_id = npe_spec.args[0];
 472
 473                 ret = of_parse_phandle_with_fixed_args(np, "queue-rx", 1, 0,
 474                                                        &queue_spec);
 475                 if (ret) {
 476                         dev_err(dev, "no rx queue phandle\n");
 477                         return -ENODEV;
 478                 }
 479                 recv_qid = queue_spec.args[0];
 480
 481                 ret = of_parse_phandle_with_fixed_args(np, "queue-txready", 1, 0,
 482                                                        &queue_spec);
 483                 if (ret) {
 484                         dev_err(dev, "no txready queue phandle\n");
 485                         return -ENODEV;
 486                 }
 487                 send_qid = queue_spec.args[0];
 488         } else {
 489                 /*
 490                  * Hardcoded engine when using platform data, this goes away
 491                  * when we switch to using DT only.
 492                  */
 493                 npe_id = 2;
 494                 send_qid = 29;
 495                 recv_qid = 30;
 496         }
 497
 498         npe_c = npe_request(npe_id);
 499         if (!npe_c)
 500                 return ret;
 501
 502         if (!npe_running(npe_c)) {
 503                 ret = npe_load_firmware(npe_c, npe_name(npe_c), dev);
 504                 if (ret)
 505                         goto npe_release;
 506                 if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
 507                         goto npe_error;
 508         } else {
 509                 if (npe_send_message(npe_c, msg, "STATUS_MSG"))
 510                         goto npe_error;
 511
 512                 if (npe_recv_message(npe_c, msg, "STATUS_MSG"))
 513                         goto npe_error;
 514         }
 515
 516         switch ((msg[1] >> 16) & 0xff) {
 517         case 3:
 518                 dev_warn(dev, "Firmware of %s lacks AES support\n", npe_name(npe_c));
 519                 support_aes = 0;
 520                 break;
 521         case 4:
 522         case 5:
 523                 support_aes = 1;
 524                 break;
 525         default:
 526                 dev_err(dev, "Firmware of %s lacks crypto support\n", npe_name(npe_c));
 527                 ret = -ENODEV;
 528                 goto npe_release;
 529         }
 530         /* buffer_pool will also be used to sometimes store the hmac,
 531          * so assure it is large enough
 532          */
 533         BUILD_BUG_ON(SHA1_DIGEST_SIZE > sizeof(struct buffer_desc));
 534         buffer_pool = dma_pool_create("buffer", dev, sizeof(struct buffer_desc),
 535                                       32, 0);
 536         ret = -ENOMEM;
 537         if (!buffer_pool)
 538                 goto err;
 539
 540         ctx_pool = dma_pool_create("context", dev, NPE_CTX_LEN, 16, 0);
 541         if (!ctx_pool)
 542                 goto err;
 543
 544         ret = qmgr_request_queue(send_qid, NPE_QLEN_TOTAL, 0, 0,
 545                                  "ixp_crypto:out", NULL);
 546         if (ret)
 547                 goto err;
 548         ret = qmgr_request_queue(recv_qid, NPE_QLEN, 0, 0,
 549                                  "ixp_crypto:in", NULL);
 550         if (ret) {
 551                 qmgr_release_queue(send_qid);
 552                 goto err;
 553         }
 554         qmgr_set_irq(recv_qid, QUEUE_IRQ_SRC_NOT_EMPTY, irqhandler, NULL);
 555         tasklet_init(&crypto_done_tasklet, crypto_done_action, 0);
 556
 557         qmgr_enable_irq(recv_qid);
 558         return 0;
 559
 560 npe_error:
 561         dev_err(dev, "%s not responding\n", npe_name(npe_c));
 562         ret = -EIO;
 563 err:
 564         dma_pool_destroy(ctx_pool);
 565         dma_pool_destroy(buffer_pool);
 566 npe_release:
 567         npe_release(npe_c);
 568         return ret;
 569 }
 570
 571 static void release_ixp_crypto(struct device *dev)
 572 {
 573         qmgr_disable_irq(recv_qid);
 574         tasklet_kill(&crypto_done_tasklet);
 575
 576         qmgr_release_queue(send_qid);
 577         qmgr_release_queue(recv_qid);
 578
 579         dma_pool_destroy(ctx_pool);
 580         dma_pool_destroy(buffer_pool);
 581
 582         npe_release(npe_c);
 583
 584         if (crypt_virt)
 585                 dma_free_coherent(dev, NPE_QLEN * sizeof(struct crypt_ctl),
 586                                   crypt_virt, crypt_phys);
 587 }
 588
 589 static void reset_sa_dir(struct ix_sa_dir *dir)
 590 {
 591         memset(dir->npe_ctx, 0, NPE_CTX_LEN);
 592         dir->npe_ctx_idx = 0;
 593         dir->npe_mode = 0;
 594 }
 595
 596 static int init_sa_dir(struct ix_sa_dir *dir)
 597 {
 598         dir->npe_ctx = dma_pool_alloc(ctx_pool, GFP_KERNEL, &dir->npe_ctx_phys);
 599         if (!dir->npe_ctx)
 600                 return -ENOMEM;
 601
 602         reset_sa_dir(dir);
 603         return 0;
 604 }
 605
 606 static void free_sa_dir(struct ix_sa_dir *dir)
 607 {
 608         memset(dir->npe_ctx, 0, NPE_CTX_LEN);
 609         dma_pool_free(ctx_pool, dir->npe_ctx, dir->npe_ctx_phys);
 610 }
 611
 612 static int init_tfm(struct crypto_tfm *tfm)
 613 {
 614         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 615         int ret;
 616
 617         atomic_set(&ctx->configuring, 0);
 618         ret = init_sa_dir(&ctx->encrypt);
 619         if (ret)
 620                 return ret;
 621         ret = init_sa_dir(&ctx->decrypt);
 622         if (ret)
 623                 free_sa_dir(&ctx->encrypt);
 624
 625         return ret;
 626 }
 627
 628 static int init_tfm_ablk(struct crypto_skcipher *tfm)
 629 {
 630         struct crypto_tfm *ctfm = crypto_skcipher_tfm(tfm);
 631         struct ixp_ctx *ctx = crypto_tfm_ctx(ctfm);
 632         const char *name = crypto_tfm_alg_name(ctfm);
 633
 634         ctx->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 635         if (IS_ERR(ctx->fallback_tfm)) {
 636                 pr_err("ERROR: Cannot allocate fallback for %s %ld\n",
 637                         name, PTR_ERR(ctx->fallback_tfm));
 638                 return PTR_ERR(ctx->fallback_tfm);
 639         }
 640
 641         pr_info("Fallback for %s is %s\n",
 642                  crypto_tfm_alg_driver_name(&tfm->base),
 643                  crypto_tfm_alg_driver_name(crypto_skcipher_tfm(ctx->fallback_tfm))
 644                  );
 645
 646         crypto_skcipher_set_reqsize(tfm, sizeof(struct ablk_ctx) + crypto_skcipher_reqsize(ctx->fallback_tfm));
 647         return init_tfm(crypto_skcipher_tfm(tfm));
 648 }
 649
 650 static int init_tfm_aead(struct crypto_aead *tfm)
 651 {
 652         crypto_aead_set_reqsize(tfm, sizeof(struct aead_ctx));
 653         return init_tfm(crypto_aead_tfm(tfm));
 654 }
 655
 656 static void exit_tfm(struct crypto_tfm *tfm)
 657 {
 658         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 659
 660         free_sa_dir(&ctx->encrypt);
 661         free_sa_dir(&ctx->decrypt);
 662 }
 663
 664 static void exit_tfm_ablk(struct crypto_skcipher *tfm)
 665 {
 666         struct crypto_tfm *ctfm = crypto_skcipher_tfm(tfm);
 667         struct ixp_ctx *ctx = crypto_tfm_ctx(ctfm);
 668
 669         crypto_free_skcipher(ctx->fallback_tfm);
 670         exit_tfm(crypto_skcipher_tfm(tfm));
 671 }
 672
 673 static void exit_tfm_aead(struct crypto_aead *tfm)
 674 {
 675         exit_tfm(crypto_aead_tfm(tfm));
 676 }
 677
 678 static int register_chain_var(struct crypto_tfm *tfm, u8 xpad, u32 target,
 679                               int init_len, u32 ctx_addr, const u8 *key,
 680                               int key_len)
 681 {
 682         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 683         struct crypt_ctl *crypt;
 684         struct buffer_desc *buf;
 685         int i;
 686         u8 *pad;
 687         dma_addr_t pad_phys, buf_phys;
 688
 689         BUILD_BUG_ON(NPE_CTX_LEN < HMAC_PAD_BLOCKLEN);
 690         pad = dma_pool_alloc(ctx_pool, GFP_KERNEL, &pad_phys);
 691         if (!pad)
 692                 return -ENOMEM;
 693         buf = dma_pool_alloc(buffer_pool, GFP_KERNEL, &buf_phys);
 694         if (!buf) {
 695                 dma_pool_free(ctx_pool, pad, pad_phys);
 696                 return -ENOMEM;
 697         }
 698         crypt = get_crypt_desc_emerg();
 699         if (!crypt) {
 700                 dma_pool_free(ctx_pool, pad, pad_phys);
 701                 dma_pool_free(buffer_pool, buf, buf_phys);
 702                 return -EAGAIN;
 703         }
 704
 705         memcpy(pad, key, key_len);
 706         memset(pad + key_len, 0, HMAC_PAD_BLOCKLEN - key_len);
 707         for (i = 0; i < HMAC_PAD_BLOCKLEN; i++)
 708                 pad[i] ^= xpad;
 709
 710         crypt->data.tfm = tfm;
 711         crypt->regist_ptr = pad;
 712         crypt->regist_buf = buf;
 713
 714         crypt->auth_offs = 0;
 715         crypt->auth_len = HMAC_PAD_BLOCKLEN;
 716         crypt->crypto_ctx = ctx_addr;
 717         crypt->src_buf = buf_phys;
 718         crypt->icv_rev_aes = target;
 719         crypt->mode = NPE_OP_HASH_GEN_ICV;
 720         crypt->init_len = init_len;
 721         crypt->ctl_flags |= CTL_FLAG_GEN_ICV;
 722
 723         buf->next = NULL;
 724         buf->buf_len = HMAC_PAD_BLOCKLEN;
 725         buf->pkt_len = 0;
 726         buf->phys_addr = pad_phys;
 727
 728         atomic_inc(&ctx->configuring);
 729         qmgr_put_entry(send_qid, crypt_virt2phys(crypt));
 730         BUG_ON(qmgr_stat_overflow(send_qid));
 731         return 0;
 732 }
 733
 734 static int setup_auth(struct crypto_tfm *tfm, int encrypt, unsigned int authsize,
 735                       const u8 *key, int key_len, unsigned int digest_len)
 736 {
 737         u32 itarget, otarget, npe_ctx_addr;
 738         unsigned char *cinfo;
 739         int init_len, ret = 0;
 740         u32 cfgword;
 741         struct ix_sa_dir *dir;
 742         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 743         const struct ix_hash_algo *algo;
 744
 745         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 746         cinfo = dir->npe_ctx + dir->npe_ctx_idx;
 747         algo = ix_hash(tfm);
 748
 749         /* write cfg word to cryptinfo */
 750         cfgword = algo->cfgword | (authsize << 6); /* (authsize/4) << 8 */
 751 #ifndef __ARMEB__
 752         cfgword ^= 0xAA000000; /* change the "byte swap" flags */
 753 #endif
 754         *(__be32 *)cinfo = cpu_to_be32(cfgword);
 755         cinfo += sizeof(cfgword);
 756
 757         /* write ICV to cryptinfo */
 758         memcpy(cinfo, algo->icv, digest_len);
 759         cinfo += digest_len;
 760
 761         itarget = dir->npe_ctx_phys + dir->npe_ctx_idx
 762                                 + sizeof(algo->cfgword);
 763         otarget = itarget + digest_len;
 764         init_len = cinfo - (dir->npe_ctx + dir->npe_ctx_idx);
 765         npe_ctx_addr = dir->npe_ctx_phys + dir->npe_ctx_idx;
 766
 767         dir->npe_ctx_idx += init_len;
 768         dir->npe_mode |= NPE_OP_HASH_ENABLE;
 769
 770         if (!encrypt)
 771                 dir->npe_mode |= NPE_OP_HASH_VERIFY;
 772
 773         ret = register_chain_var(tfm, HMAC_OPAD_VALUE, otarget,
 774                                  init_len, npe_ctx_addr, key, key_len);
 775         if (ret)
 776                 return ret;
 777         return register_chain_var(tfm, HMAC_IPAD_VALUE, itarget,
 778                                   init_len, npe_ctx_addr, key, key_len);
 779 }
 780
 781 static int gen_rev_aes_key(struct crypto_tfm *tfm)
 782 {
 783         struct crypt_ctl *crypt;
 784         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 785         struct ix_sa_dir *dir = &ctx->decrypt;
 786
 787         crypt = get_crypt_desc_emerg();
 788         if (!crypt)
 789                 return -EAGAIN;
 790
 791         *(__be32 *)dir->npe_ctx |= cpu_to_be32(CIPH_ENCR);
 792
 793         crypt->data.tfm = tfm;
 794         crypt->crypt_offs = 0;
 795         crypt->crypt_len = AES_BLOCK128;
 796         crypt->src_buf = 0;
 797         crypt->crypto_ctx = dir->npe_ctx_phys;
 798         crypt->icv_rev_aes = dir->npe_ctx_phys + sizeof(u32);
 799         crypt->mode = NPE_OP_ENC_GEN_KEY;
 800         crypt->init_len = dir->npe_ctx_idx;
 801         crypt->ctl_flags |= CTL_FLAG_GEN_REVAES;
 802
 803         atomic_inc(&ctx->configuring);
 804         qmgr_put_entry(send_qid, crypt_virt2phys(crypt));
 805         BUG_ON(qmgr_stat_overflow(send_qid));
 806         return 0;
 807 }
 808
 809 static int setup_cipher(struct crypto_tfm *tfm, int encrypt, const u8 *key,
 810                         int key_len)
 811 {
 812         u8 *cinfo;
 813         u32 cipher_cfg;
 814         u32 keylen_cfg = 0;
 815         struct ix_sa_dir *dir;
 816         struct ixp_ctx *ctx = crypto_tfm_ctx(tfm);
 817         int err;
 818
 819         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 820         cinfo = dir->npe_ctx;
 821
 822         if (encrypt) {
 823                 cipher_cfg = cipher_cfg_enc(tfm);
 824                 dir->npe_mode |= NPE_OP_CRYPT_ENCRYPT;
 825         } else {
 826                 cipher_cfg = cipher_cfg_dec(tfm);
 827         }
 828         if (cipher_cfg & MOD_AES) {
 829                 switch (key_len) {
 830                 case 16:
 831                         keylen_cfg = MOD_AES128;
 832                         break;
 833                 case 24:
 834                         keylen_cfg = MOD_AES192;
 835                         break;
 836                 case 32:
 837                         keylen_cfg = MOD_AES256;
 838                         break;
 839                 default:
 840                         return -EINVAL;
 841                 }
 842                 cipher_cfg |= keylen_cfg;
 843         } else {
 844                 err = crypto_des_verify_key(tfm, key);
 845                 if (err)
 846                         return err;
 847         }
 848         /* write cfg word to cryptinfo */
 849         *(__be32 *)cinfo = cpu_to_be32(cipher_cfg);
 850         cinfo += sizeof(cipher_cfg);
 851
 852         /* write cipher key to cryptinfo */
 853         memcpy(cinfo, key, key_len);
 854         /* NPE wants keylen set to DES3_EDE_KEY_SIZE even for single DES */
 855         if (key_len < DES3_EDE_KEY_SIZE && !(cipher_cfg & MOD_AES)) {
 856                 memset(cinfo + key_len, 0, DES3_EDE_KEY_SIZE - key_len);
 857                 key_len = DES3_EDE_KEY_SIZE;
 858         }
 859         dir->npe_ctx_idx = sizeof(cipher_cfg) + key_len;
 860         dir->npe_mode |= NPE_OP_CRYPT_ENABLE;
 861         if ((cipher_cfg & MOD_AES) && !encrypt)
 862                 return gen_rev_aes_key(tfm);
 863
 864         return 0;
 865 }
 866
 867 static struct buffer_desc *chainup_buffers(struct device *dev,
 868                 struct scatterlist *sg, unsigned int nbytes,
 869                 struct buffer_desc *buf, gfp_t flags,
 870                 enum dma_data_direction dir)
 871 {
 872         for (; nbytes > 0; sg = sg_next(sg)) {
 873                 unsigned int len = min(nbytes, sg->length);
 874                 struct buffer_desc *next_buf;
 875                 dma_addr_t next_buf_phys;
 876                 void *ptr;
 877
 878                 nbytes -= len;
 879                 ptr = sg_virt(sg);
 880                 next_buf = dma_pool_alloc(buffer_pool, flags, &next_buf_phys);
 881                 if (!next_buf) {
 882                         buf = NULL;
 883                         break;
 884                 }
 885                 sg_dma_address(sg) = dma_map_single(dev, ptr, len, dir);
 886                 buf->next = next_buf;
 887                 buf->phys_next = next_buf_phys;
 888                 buf = next_buf;
 889
 890                 buf->phys_addr = sg_dma_address(sg);
 891                 buf->buf_len = len;
 892                 buf->dir = dir;
 893         }
 894         buf->next = NULL;
 895         buf->phys_next = 0;
 896         return buf;
 897 }
 898
 899 static int ablk_setkey(struct crypto_skcipher *tfm, const u8 *key,
 900                        unsigned int key_len)
 901 {
 902         struct ixp_ctx *ctx = crypto_skcipher_ctx(tfm);
 903         int ret;
 904
 905         init_completion(&ctx->completion);
 906         atomic_inc(&ctx->configuring);
 907
 908         reset_sa_dir(&ctx->encrypt);
 909         reset_sa_dir(&ctx->decrypt);
 910
 911         ctx->encrypt.npe_mode = NPE_OP_HMAC_DISABLE;
 912         ctx->decrypt.npe_mode = NPE_OP_HMAC_DISABLE;
 913
 914         ret = setup_cipher(&tfm->base, 0, key, key_len);
 915         if (ret)
 916                 goto out;
 917         ret = setup_cipher(&tfm->base, 1, key, key_len);
 918 out:
 919         if (!atomic_dec_and_test(&ctx->configuring))
 920                 wait_for_completion(&ctx->completion);
 921         if (ret)
 922                 return ret;
 923         crypto_skcipher_clear_flags(ctx->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 924         crypto_skcipher_set_flags(ctx->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 925
 926         return crypto_skcipher_setkey(ctx->fallback_tfm, key, key_len);
 927 }
 928
 929 static int ablk_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
 930                             unsigned int key_len)
 931 {
 932         return verify_skcipher_des3_key(tfm, key) ?:
 933                ablk_setkey(tfm, key, key_len);
 934 }
 935
 936 static int ablk_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key,
 937                                unsigned int key_len)
 938 {
 939         struct ixp_ctx *ctx = crypto_skcipher_ctx(tfm);
 940
 941         /* the nonce is stored in bytes at end of key */
 942         if (key_len < CTR_RFC3686_NONCE_SIZE)
 943                 return -EINVAL;
 944
 945         memcpy(ctx->nonce, key + (key_len - CTR_RFC3686_NONCE_SIZE),
 946                CTR_RFC3686_NONCE_SIZE);
 947
 948         key_len -= CTR_RFC3686_NONCE_SIZE;
 949         return ablk_setkey(tfm, key, key_len);
 950 }
 951
 952 static int ixp4xx_cipher_fallback(struct skcipher_request *areq, int encrypt)
 953 {
 954         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 955         struct ixp_ctx *op = crypto_skcipher_ctx(tfm);
 956         struct ablk_ctx *rctx = skcipher_request_ctx(areq);
 957         int err;
 958
 959         skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
 960         skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
 961                                       areq->base.complete, areq->base.data);
 962         skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
 963                                    areq->cryptlen, areq->iv);
 964         if (encrypt)
 965                 err = crypto_skcipher_encrypt(&rctx->fallback_req);
 966         else
 967                 err = crypto_skcipher_decrypt(&rctx->fallback_req);
 968         return err;
 969 }
 970
 971 static int ablk_perform(struct skcipher_request *req, int encrypt)
 972 {
 973         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 974         struct ixp_ctx *ctx = crypto_skcipher_ctx(tfm);
 975         unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 976         struct ix_sa_dir *dir;
 977         struct crypt_ctl *crypt;
 978         unsigned int nbytes = req->cryptlen;
 979         enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;
 980         struct ablk_ctx *req_ctx = skcipher_request_ctx(req);
 981         struct buffer_desc src_hook;
 982         struct device *dev = &pdev->dev;
 983         unsigned int offset;
 984         gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
 985                                 GFP_KERNEL : GFP_ATOMIC;
 986
 987         if (sg_nents(req->src) > 1 || sg_nents(req->dst) > 1)
 988                 return ixp4xx_cipher_fallback(req, encrypt);
 989
 990         if (qmgr_stat_full(send_qid))
 991                 return -EAGAIN;
 992         if (atomic_read(&ctx->configuring))
 993                 return -EAGAIN;
 994
 995         dir = encrypt ? &ctx->encrypt : &ctx->decrypt;
 996         req_ctx->encrypt = encrypt;
 997
 998         crypt = get_crypt_desc();
 999         if (!crypt)
1000                 return -ENOMEM;
1001
1002         crypt->data.ablk_req = req;
1003         crypt->crypto_ctx = dir->npe_ctx_phys;
1004         crypt->mode = dir->npe_mode;
1005         crypt->init_len = dir->npe_ctx_idx;
1006
1007         crypt->crypt_offs = 0;
1008         crypt->crypt_len = nbytes;
1009
1010         BUG_ON(ivsize && !req->iv);
1011         memcpy(crypt->iv, req->iv, ivsize);
1012         if (ivsize > 0 && !encrypt) {
1013                 offset = req->cryptlen - ivsize;
1014                 scatterwalk_map_and_copy(req_ctx->iv, req->src, offset, ivsize, 0);
1015         }
1016         if (req->src != req->dst) {
1017                 struct buffer_desc dst_hook;
1018
1019                 crypt->mode |= NPE_OP_NOT_IN_PLACE;
1020                 /* This was never tested by Intel
1021                  * for more than one dst buffer, I think. */
1022                 req_ctx->dst = NULL;
1023                 if (!chainup_buffers(dev, req->dst, nbytes, &dst_hook,
1024                                      flags, DMA_FROM_DEVICE))
1025                         goto free_buf_dest;
1026                 src_direction = DMA_TO_DEVICE;
1027                 req_ctx->dst = dst_hook.next;
1028                 crypt->dst_buf = dst_hook.phys_next;
1029         } else {
1030                 req_ctx->dst = NULL;
1031         }
1032         req_ctx->src = NULL;
1033         if (!chainup_buffers(dev, req->src, nbytes, &src_hook, flags,
1034                              src_direction))
1035                 goto free_buf_src;
1036
1037         req_ctx->src = src_hook.next;
1038         crypt->src_buf = src_hook.phys_next;
1039         crypt->ctl_flags |= CTL_FLAG_PERFORM_ABLK;
1040         qmgr_put_entry(send_qid, crypt_virt2phys(crypt));
1041         BUG_ON(qmgr_stat_overflow(send_qid));
1042         return -EINPROGRESS;
1043
1044 free_buf_src:
1045         free_buf_chain(dev, req_ctx->src, crypt->src_buf);
1046 free_buf_dest:
1047         if (req->src != req->dst)
1048                 free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
1049
1050         crypt->ctl_flags = CTL_FLAG_UNUSED;
1051         return -ENOMEM;
1052 }
1053
1054 static int ablk_encrypt(struct skcipher_request *req)
1055 {
1056         return ablk_perform(req, 1);
1057 }
1058
1059 static int ablk_decrypt(struct skcipher_request *req)
1060 {
1061         return ablk_perform(req, 0);
1062 }
1063
1064 static int ablk_rfc3686_crypt(struct skcipher_request *req)
1065 {
1066         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
1067         struct ixp_ctx *ctx = crypto_skcipher_ctx(tfm);
1068         u8 iv[CTR_RFC3686_BLOCK_SIZE];
1069         u8 *info = req->iv;
1070         int ret;
1071
1072         /* set up counter block */
1073         memcpy(iv, ctx->nonce, CTR_RFC3686_NONCE_SIZE);
1074         memcpy(iv + CTR_RFC3686_NONCE_SIZE, info, CTR_RFC3686_IV_SIZE);
1075
1076         /* initialize counter portion of counter block */
1077         *(__be32 *)(iv + CTR_RFC3686_NONCE_SIZE + CTR_RFC3686_IV_SIZE) =
1078                 cpu_to_be32(1);
1079
1080         req->iv = iv;
1081         ret = ablk_perform(req, 1);
1082         req->iv = info;
1083         return ret;
1084 }
1085
1086 static int aead_perform(struct aead_request *req, int encrypt,
1087                         int cryptoffset, int eff_cryptlen, u8 *iv)
1088 {
1089         struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1090         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1091         unsigned int ivsize = crypto_aead_ivsize(tfm);
1092         unsigned int authsize = crypto_aead_authsize(tfm);
1093         struct ix_sa_dir *dir;
1094         struct crypt_ctl *crypt;
1095         unsigned int cryptlen;
1096         struct buffer_desc *buf, src_hook;
1097         struct aead_ctx *req_ctx = aead_request_ctx(req);
1098         struct device *dev = &pdev->dev;
1099         gfp_t flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
1100                                 GFP_KERNEL : GFP_ATOMIC;
1101         enum dma_data_direction src_direction = DMA_BIDIRECTIONAL;
1102         unsigned int lastlen;
1103
1104         if (qmgr_stat_full(send_qid))
1105                 return -EAGAIN;
1106         if (atomic_read(&ctx->configuring))
1107                 return -EAGAIN;
1108
1109         if (encrypt) {
1110                 dir = &ctx->encrypt;
1111                 cryptlen = req->cryptlen;
1112         } else {
1113                 dir = &ctx->decrypt;
1114                 /* req->cryptlen includes the authsize when decrypting */
1115                 cryptlen = req->cryptlen - authsize;
1116                 eff_cryptlen -= authsize;
1117         }
1118         crypt = get_crypt_desc();
1119         if (!crypt)
1120                 return -ENOMEM;
1121
1122         crypt->data.aead_req = req;
1123         crypt->crypto_ctx = dir->npe_ctx_phys;
1124         crypt->mode = dir->npe_mode;
1125         crypt->init_len = dir->npe_ctx_idx;
1126
1127         crypt->crypt_offs = cryptoffset;
1128         crypt->crypt_len = eff_cryptlen;
1129
1130         crypt->auth_offs = 0;
1131         crypt->auth_len = req->assoclen + cryptlen;
1132         BUG_ON(ivsize && !req->iv);
1133         memcpy(crypt->iv, req->iv, ivsize);
1134
1135         buf = chainup_buffers(dev, req->src, crypt->auth_len,
1136                               &src_hook, flags, src_direction);
1137         req_ctx->src = src_hook.next;
1138         crypt->src_buf = src_hook.phys_next;
1139         if (!buf)
1140                 goto free_buf_src;
1141
1142         lastlen = buf->buf_len;
1143         if (lastlen >= authsize)
1144                 crypt->icv_rev_aes = buf->phys_addr +
1145                                      buf->buf_len - authsize;
1146
1147         req_ctx->dst = NULL;
1148
1149         if (req->src != req->dst) {
1150                 struct buffer_desc dst_hook;
1151
1152                 crypt->mode |= NPE_OP_NOT_IN_PLACE;
1153                 src_direction = DMA_TO_DEVICE;
1154
1155                 buf = chainup_buffers(dev, req->dst, crypt->auth_len,
1156                                       &dst_hook, flags, DMA_FROM_DEVICE);
1157                 req_ctx->dst = dst_hook.next;
1158                 crypt->dst_buf = dst_hook.phys_next;
1159
1160                 if (!buf)
1161                         goto free_buf_dst;
1162
1163                 if (encrypt) {
1164                         lastlen = buf->buf_len;
1165                         if (lastlen >= authsize)
1166                                 crypt->icv_rev_aes = buf->phys_addr +
1167                                                      buf->buf_len - authsize;
1168                 }
1169         }
1170
1171         if (unlikely(lastlen < authsize)) {
1172                 /* The 12 hmac bytes are scattered,
1173                  * we need to copy them into a safe buffer */
1174                 req_ctx->hmac_virt = dma_pool_alloc(buffer_pool, flags,
1175                                                     &crypt->icv_rev_aes);
1176                 if (unlikely(!req_ctx->hmac_virt))
1177                         goto free_buf_dst;
1178                 if (!encrypt) {
1179                         scatterwalk_map_and_copy(req_ctx->hmac_virt,
1180                                                  req->src, cryptlen, authsize, 0);
1181                 }
1182                 req_ctx->encrypt = encrypt;
1183         } else {
1184                 req_ctx->hmac_virt = NULL;
1185         }
1186
1187         crypt->ctl_flags |= CTL_FLAG_PERFORM_AEAD;
1188         qmgr_put_entry(send_qid, crypt_virt2phys(crypt));
1189         BUG_ON(qmgr_stat_overflow(send_qid));
1190         return -EINPROGRESS;
1191
1192 free_buf_dst:
1193         free_buf_chain(dev, req_ctx->dst, crypt->dst_buf);
1194 free_buf_src:
1195         free_buf_chain(dev, req_ctx->src, crypt->src_buf);
1196         crypt->ctl_flags = CTL_FLAG_UNUSED;
1197         return -ENOMEM;
1198 }
1199
1200 static int aead_setup(struct crypto_aead *tfm, unsigned int authsize)
1201 {
1202         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1203         unsigned int digest_len = crypto_aead_maxauthsize(tfm);
1204         int ret;
1205
1206         if (!ctx->enckey_len && !ctx->authkey_len)
1207                 return 0;
1208         init_completion(&ctx->completion);
1209         atomic_inc(&ctx->configuring);
1210
1211         reset_sa_dir(&ctx->encrypt);
1212         reset_sa_dir(&ctx->decrypt);
1213
1214         ret = setup_cipher(&tfm->base, 0, ctx->enckey, ctx->enckey_len);
1215         if (ret)
1216                 goto out;
1217         ret = setup_cipher(&tfm->base, 1, ctx->enckey, ctx->enckey_len);
1218         if (ret)
1219                 goto out;
1220         ret = setup_auth(&tfm->base, 0, authsize, ctx->authkey,
1221                          ctx->authkey_len, digest_len);
1222         if (ret)
1223                 goto out;
1224         ret = setup_auth(&tfm->base, 1, authsize,  ctx->authkey,
1225                          ctx->authkey_len, digest_len);
1226 out:
1227         if (!atomic_dec_and_test(&ctx->configuring))
1228                 wait_for_completion(&ctx->completion);
1229         return ret;
1230 }
1231
1232 static int aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
1233 {
1234         int max = crypto_aead_maxauthsize(tfm) >> 2;
1235
1236         if ((authsize >> 2) < 1 || (authsize >> 2) > max || (authsize & 3))
1237                 return -EINVAL;
1238         return aead_setup(tfm, authsize);
1239 }
1240
1241 static int aead_setkey(struct crypto_aead *tfm, const u8 *key,
1242                        unsigned int keylen)
1243 {
1244         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1245         struct crypto_authenc_keys keys;
1246
1247         if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
1248                 goto badkey;
1249
1250         if (keys.authkeylen > sizeof(ctx->authkey))
1251                 goto badkey;
1252
1253         if (keys.enckeylen > sizeof(ctx->enckey))
1254                 goto badkey;
1255
1256         memcpy(ctx->authkey, keys.authkey, keys.authkeylen);
1257         memcpy(ctx->enckey, keys.enckey, keys.enckeylen);
1258         ctx->authkey_len = keys.authkeylen;
1259         ctx->enckey_len = keys.enckeylen;
1260
1261         memzero_explicit(&keys, sizeof(keys));
1262         return aead_setup(tfm, crypto_aead_authsize(tfm));
1263 badkey:
1264         memzero_explicit(&keys, sizeof(keys));
1265         return -EINVAL;
1266 }
1267
1268 static int des3_aead_setkey(struct crypto_aead *tfm, const u8 *key,
1269                             unsigned int keylen)
1270 {
1271         struct ixp_ctx *ctx = crypto_aead_ctx(tfm);
1272         struct crypto_authenc_keys keys;
1273         int err;
1274
1275         err = crypto_authenc_extractkeys(&keys, key, keylen);
1276         if (unlikely(err))
1277                 goto badkey;
1278
1279         err = -EINVAL;
1280         if (keys.authkeylen > sizeof(ctx->authkey))
1281                 goto badkey;
1282
1283         err = verify_aead_des3_key(tfm, keys.enckey, keys.enckeylen);
1284         if (err)
1285                 goto badkey;
1286
1287         memcpy(ctx->authkey, keys.authkey, keys.authkeylen);
1288         memcpy(ctx->enckey, keys.enckey, keys.enckeylen);
1289         ctx->authkey_len = keys.authkeylen;
1290         ctx->enckey_len = keys.enckeylen;
1291
1292         memzero_explicit(&keys, sizeof(keys));
1293         return aead_setup(tfm, crypto_aead_authsize(tfm));
1294 badkey:
1295         memzero_explicit(&keys, sizeof(keys));
1296         return err;
1297 }
1298
1299 static int aead_encrypt(struct aead_request *req)
1300 {
1301         return aead_perform(req, 1, req->assoclen, req->cryptlen, req->iv);
1302 }
1303
1304 static int aead_decrypt(struct aead_request *req)
1305 {
1306         return aead_perform(req, 0, req->assoclen, req->cryptlen, req->iv);
1307 }
1308
1309 static struct ixp_alg ixp4xx_algos[] = {
1310 {
1311         .crypto = {
1312                 .base.cra_name          = "cbc(des)",
1313                 .base.cra_blocksize     = DES_BLOCK_SIZE,
1314
1315                 .min_keysize            = DES_KEY_SIZE,
1316                 .max_keysize            = DES_KEY_SIZE,
1317                 .ivsize                 = DES_BLOCK_SIZE,
1318         },
1319         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1320         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1321
1322 }, {
1323         .crypto = {
1324                 .base.cra_name          = "ecb(des)",
1325                 .base.cra_blocksize     = DES_BLOCK_SIZE,
1326                 .min_keysize            = DES_KEY_SIZE,
1327                 .max_keysize            = DES_KEY_SIZE,
1328         },
1329         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_ECB | KEYLEN_192,
1330         .cfg_dec = CIPH_DECR | MOD_DES | MOD_ECB | KEYLEN_192,
1331 }, {
1332         .crypto = {
1333                 .base.cra_name          = "cbc(des3_ede)",
1334                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
1335
1336                 .min_keysize            = DES3_EDE_KEY_SIZE,
1337                 .max_keysize            = DES3_EDE_KEY_SIZE,
1338                 .ivsize                 = DES3_EDE_BLOCK_SIZE,
1339                 .setkey                 = ablk_des3_setkey,
1340         },
1341         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1342         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1343 }, {
1344         .crypto = {
1345                 .base.cra_name          = "ecb(des3_ede)",
1346                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
1347
1348                 .min_keysize            = DES3_EDE_KEY_SIZE,
1349                 .max_keysize            = DES3_EDE_KEY_SIZE,
1350                 .setkey                 = ablk_des3_setkey,
1351         },
1352         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_ECB | KEYLEN_192,
1353         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_ECB | KEYLEN_192,
1354 }, {
1355         .crypto = {
1356                 .base.cra_name          = "cbc(aes)",
1357                 .base.cra_blocksize     = AES_BLOCK_SIZE,
1358
1359                 .min_keysize            = AES_MIN_KEY_SIZE,
1360                 .max_keysize            = AES_MAX_KEY_SIZE,
1361                 .ivsize                 = AES_BLOCK_SIZE,
1362         },
1363         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1364         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1365 }, {
1366         .crypto = {
1367                 .base.cra_name          = "ecb(aes)",
1368                 .base.cra_blocksize     = AES_BLOCK_SIZE,
1369
1370                 .min_keysize            = AES_MIN_KEY_SIZE,
1371                 .max_keysize            = AES_MAX_KEY_SIZE,
1372         },
1373         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_ECB,
1374         .cfg_dec = CIPH_DECR | MOD_AES | MOD_ECB,
1375 }, {
1376         .crypto = {
1377                 .base.cra_name          = "ctr(aes)",
1378                 .base.cra_blocksize     = 1,
1379
1380                 .min_keysize            = AES_MIN_KEY_SIZE,
1381                 .max_keysize            = AES_MAX_KEY_SIZE,
1382                 .ivsize                 = AES_BLOCK_SIZE,
1383         },
1384         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
1385         .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
1386 }, {
1387         .crypto = {
1388                 .base.cra_name          = "rfc3686(ctr(aes))",
1389                 .base.cra_blocksize     = 1,
1390
1391                 .min_keysize            = AES_MIN_KEY_SIZE,
1392                 .max_keysize            = AES_MAX_KEY_SIZE,
1393                 .ivsize                 = AES_BLOCK_SIZE,
1394                 .setkey                 = ablk_rfc3686_setkey,
1395                 .encrypt                = ablk_rfc3686_crypt,
1396                 .decrypt                = ablk_rfc3686_crypt,
1397         },
1398         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CTR,
1399         .cfg_dec = CIPH_ENCR | MOD_AES | MOD_CTR,
1400 } };
1401
1402 static struct ixp_aead_alg ixp4xx_aeads[] = {
1403 {
1404         .crypto = {
1405                 .base = {
1406                         .cra_name       = "authenc(hmac(md5),cbc(des))",
1407                         .cra_blocksize  = DES_BLOCK_SIZE,
1408                 },
1409                 .ivsize         = DES_BLOCK_SIZE,
1410                 .maxauthsize    = MD5_DIGEST_SIZE,
1411         },
1412         .hash = &hash_alg_md5,
1413         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1414         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1415 }, {
1416         .crypto = {
1417                 .base = {
1418                         .cra_name       = "authenc(hmac(md5),cbc(des3_ede))",
1419                         .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1420                 },
1421                 .ivsize         = DES3_EDE_BLOCK_SIZE,
1422                 .maxauthsize    = MD5_DIGEST_SIZE,
1423                 .setkey         = des3_aead_setkey,
1424         },
1425         .hash = &hash_alg_md5,
1426         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1427         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1428 }, {
1429         .crypto = {
1430                 .base = {
1431                         .cra_name       = "authenc(hmac(sha1),cbc(des))",
1432                         .cra_blocksize  = DES_BLOCK_SIZE,
1433                 },
1434                         .ivsize         = DES_BLOCK_SIZE,
1435                         .maxauthsize    = SHA1_DIGEST_SIZE,
1436         },
1437         .hash = &hash_alg_sha1,
1438         .cfg_enc = CIPH_ENCR | MOD_DES | MOD_CBC_ENC | KEYLEN_192,
1439         .cfg_dec = CIPH_DECR | MOD_DES | MOD_CBC_DEC | KEYLEN_192,
1440 }, {
1441         .crypto = {
1442                 .base = {
1443                         .cra_name       = "authenc(hmac(sha1),cbc(des3_ede))",
1444                         .cra_blocksize  = DES3_EDE_BLOCK_SIZE,
1445                 },
1446                 .ivsize         = DES3_EDE_BLOCK_SIZE,
1447                 .maxauthsize    = SHA1_DIGEST_SIZE,
1448                 .setkey         = des3_aead_setkey,
1449         },
1450         .hash = &hash_alg_sha1,
1451         .cfg_enc = CIPH_ENCR | MOD_3DES | MOD_CBC_ENC | KEYLEN_192,
1452         .cfg_dec = CIPH_DECR | MOD_3DES | MOD_CBC_DEC | KEYLEN_192,
1453 }, {
1454         .crypto = {
1455                 .base = {
1456                         .cra_name       = "authenc(hmac(md5),cbc(aes))",
1457                         .cra_blocksize  = AES_BLOCK_SIZE,
1458                 },
1459                 .ivsize         = AES_BLOCK_SIZE,
1460                 .maxauthsize    = MD5_DIGEST_SIZE,
1461         },
1462         .hash = &hash_alg_md5,
1463         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1464         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1465 }, {
1466         .crypto = {
1467                 .base = {
1468                         .cra_name       = "authenc(hmac(sha1),cbc(aes))",
1469                         .cra_blocksize  = AES_BLOCK_SIZE,
1470                 },
1471                 .ivsize         = AES_BLOCK_SIZE,
1472                 .maxauthsize    = SHA1_DIGEST_SIZE,
1473         },
1474         .hash = &hash_alg_sha1,
1475         .cfg_enc = CIPH_ENCR | MOD_AES | MOD_CBC_ENC,
1476         .cfg_dec = CIPH_DECR | MOD_AES | MOD_CBC_DEC,
1477 } };
1478
1479 #define IXP_POSTFIX "-ixp4xx"
1480
1481 static int ixp_crypto_probe(struct platform_device *_pdev)
1482 {
1483         struct device *dev = &_pdev->dev;
1484         int num = ARRAY_SIZE(ixp4xx_algos);
1485         int i, err;
1486
1487         pdev = _pdev;
1488
1489         err = init_ixp_crypto(dev);
1490         if (err)
1491                 return err;
1492
1493         for (i = 0; i < num; i++) {
1494                 struct skcipher_alg *cra = &ixp4xx_algos[i].crypto;
1495
1496                 if (snprintf(cra->base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1497                              "%s"IXP_POSTFIX, cra->base.cra_name) >=
1498                              CRYPTO_MAX_ALG_NAME)
1499                         continue;
1500                 if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES))
1501                         continue;
1502
1503                 /* block ciphers */
1504                 cra->base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
1505                                       CRYPTO_ALG_ASYNC |
1506                                       CRYPTO_ALG_ALLOCATES_MEMORY |
1507                                       CRYPTO_ALG_NEED_FALLBACK;
1508                 if (!cra->setkey)
1509                         cra->setkey = ablk_setkey;
1510                 if (!cra->encrypt)
1511                         cra->encrypt = ablk_encrypt;
1512                 if (!cra->decrypt)
1513                         cra->decrypt = ablk_decrypt;
1514                 cra->init = init_tfm_ablk;
1515                 cra->exit = exit_tfm_ablk;
1516
1517                 cra->base.cra_ctxsize = sizeof(struct ixp_ctx);
1518                 cra->base.cra_module = THIS_MODULE;
1519                 cra->base.cra_alignmask = 3;
1520                 cra->base.cra_priority = 300;
1521                 if (crypto_register_skcipher(cra))
1522                         dev_err(&pdev->dev, "Failed to register '%s'\n",
1523                                 cra->base.cra_name);
1524                 else
1525                         ixp4xx_algos[i].registered = 1;
1526         }
1527
1528         for (i = 0; i < ARRAY_SIZE(ixp4xx_aeads); i++) {
1529                 struct aead_alg *cra = &ixp4xx_aeads[i].crypto;
1530
1531                 if (snprintf(cra->base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1532                              "%s"IXP_POSTFIX, cra->base.cra_name) >=
1533                     CRYPTO_MAX_ALG_NAME)
1534                         continue;
1535                 if (!support_aes && (ixp4xx_algos[i].cfg_enc & MOD_AES))
1536                         continue;
1537
1538                 /* authenc */
1539                 cra->base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
1540                                       CRYPTO_ALG_ASYNC |
1541                                       CRYPTO_ALG_ALLOCATES_MEMORY;
1542                 cra->setkey = cra->setkey ?: aead_setkey;
1543                 cra->setauthsize = aead_setauthsize;
1544                 cra->encrypt = aead_encrypt;
1545                 cra->decrypt = aead_decrypt;
1546                 cra->init = init_tfm_aead;
1547                 cra->exit = exit_tfm_aead;
1548
1549                 cra->base.cra_ctxsize = sizeof(struct ixp_ctx);
1550                 cra->base.cra_module = THIS_MODULE;
1551                 cra->base.cra_alignmask = 3;
1552                 cra->base.cra_priority = 300;
1553
1554                 if (crypto_register_aead(cra))
1555                         dev_err(&pdev->dev, "Failed to register '%s'\n",
1556                                 cra->base.cra_driver_name);
1557                 else
1558                         ixp4xx_aeads[i].registered = 1;
1559         }
1560         return 0;
1561 }
1562
1563 static int ixp_crypto_remove(struct platform_device *pdev)
1564 {
1565         int num = ARRAY_SIZE(ixp4xx_algos);
1566         int i;
1567
1568         for (i = 0; i < ARRAY_SIZE(ixp4xx_aeads); i++) {
1569                 if (ixp4xx_aeads[i].registered)
1570                         crypto_unregister_aead(&ixp4xx_aeads[i].crypto);
1571         }
1572
1573         for (i = 0; i < num; i++) {
1574                 if (ixp4xx_algos[i].registered)
1575                         crypto_unregister_skcipher(&ixp4xx_algos[i].crypto);
1576         }
1577         release_ixp_crypto(&pdev->dev);
1578
1579         return 0;
1580 }
1581 static const struct of_device_id ixp4xx_crypto_of_match[] = {
1582         {
1583                 .compatible = "intel,ixp4xx-crypto",
1584         },
1585         {},
1586 };
1587
1588 static struct platform_driver ixp_crypto_driver = {
1589         .probe = ixp_crypto_probe,
1590         .remove = ixp_crypto_remove,
1591         .driver = {
1592                 .name = "ixp4xx_crypto",
1593                 .of_match_table = ixp4xx_crypto_of_match,
1594         },
1595 };
1596 module_platform_driver(ixp_crypto_driver);
1597
1598 MODULE_LICENSE("GPL");
1599 MODULE_AUTHOR("Christian Hohnstaedt <chohnstaedt@innominate.com>");
1600 MODULE_DESCRIPTION("IXP4xx hardware crypto");
1601