2 files changed, 206 insertions, 43 deletions

diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c
index 181d42c2deed..0ca92d414667 100644
--- a/drivers/crypto/geode-aes.c
+++ b/drivers/crypto/geode-aes.c
@@ -113,18 +113,103 @@ geode_aes_crypt(struct geode_aes_op *op)
 
 /* CRYPTO-API Functions */
 
-static int
-geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len)
+static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
+                unsigned int len)
 {
         struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+        unsigned int ret;
+
+        op->keylen = len;
+
+        if (len == AES_KEYSIZE_128) {
+                memcpy(op->key, key, len);
+                return 0;
+        }
 
-        if (len != AES_KEY_LENGTH) {
+        if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
+                /* not supported at all */
                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
                 return -EINVAL;
         }
 
-        memcpy(op->key, key, len);
-        return 0;
+        /*
+         * The requested key size is not supported by HW, do a fallback
+         */
+        op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
+        op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
+
+        ret = crypto_cipher_setkey(op->fallback.cip, key, len);
+        if (ret) {
+                tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+                tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
+        }
+        return ret;
+}
+
+static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
+                unsigned int len)
+{
+        struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+        unsigned int ret;
+
+        op->keylen = len;
+
+        if (len == AES_KEYSIZE_128) {
+                memcpy(op->key, key, len);
+                return 0;
+        }
+
+        if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
+                /* not supported at all */
+                tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
+                return -EINVAL;
+        }
+
+        /*
+         * The requested key size is not supported by HW, do a fallback
+         */
+        op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
+        op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
+
+        ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
+        if (ret) {
+                tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
+                tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
+        }
+        return ret;
+}
+
+static int fallback_blk_dec(struct blkcipher_desc *desc,
+                struct scatterlist *dst, struct scatterlist *src,
+                unsigned int nbytes)
+{
+        unsigned int ret;
+        struct crypto_blkcipher *tfm;
+        struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
+
+        tfm = desc->tfm;
+        desc->tfm = op->fallback.blk;
+
+        ret = crypto_blkcipher_decrypt(desc, dst, src, nbytes);
+
+        desc->tfm = tfm;
+        return ret;
+}
+static int fallback_blk_enc(struct blkcipher_desc *desc,
+                struct scatterlist *dst, struct scatterlist *src,
+                unsigned int nbytes)
+{
+        unsigned int ret;
+        struct crypto_blkcipher *tfm;
+        struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
+
+        tfm = desc->tfm;
+        desc->tfm = op->fallback.blk;
+
+        ret = crypto_blkcipher_encrypt(desc, dst, src, nbytes);
+
+        desc->tfm = tfm;
+        return ret;
 }
 
 static void
@@ -132,8 +217,10 @@ geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
         struct geode_aes_op *op = crypto_tfm_ctx(tfm);
 
-        if ((out == NULL) || (in == NULL))
+        if (unlikely(op->keylen != AES_KEYSIZE_128)) {
+                crypto_cipher_encrypt_one(op->fallback.cip, out, in);
                 return;
+        }
 
         op->src = (void *) in;
         op->dst = (void *) out;
@@ -151,8 +238,10 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
         struct geode_aes_op *op = crypto_tfm_ctx(tfm);
 
-        if ((out == NULL) || (in == NULL))
+        if (unlikely(op->keylen != AES_KEYSIZE_128)) {
+                crypto_cipher_decrypt_one(op->fallback.cip, out, in);
                 return;
+        }
 
         op->src = (void *) in;
         op->dst = (void *) out;
@@ -164,24 +253,50 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
         geode_aes_crypt(op);
 }
 
+static int fallback_init_cip(struct crypto_tfm *tfm)
+{
+        const char *name = tfm->__crt_alg->cra_name;
+        struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+
+        op->fallback.cip = crypto_alloc_cipher(name, 0,
+                                CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+
+        if (IS_ERR(op->fallback.cip)) {
+                printk(KERN_ERR "Error allocating fallback algo %s\n", name);
+                return PTR_ERR(op->fallback.blk);
+        }
+
+        return 0;
+}
+
+static void fallback_exit_cip(struct crypto_tfm *tfm)
+{
+        struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+
+        crypto_free_cipher(op->fallback.cip);
+        op->fallback.cip = NULL;
+}
 
 static struct crypto_alg geode_alg = {
-        .cra_name               =       "aes",
-        .cra_driver_name        =       "geode-aes-128",
-        .cra_priority           =       300,
-        .cra_alignmask          =       15,
-        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
+        .cra_name                       =       "aes",
+        .cra_driver_name        =       "geode-aes",
+        .cra_priority           =       300,
+        .cra_alignmask          =       15,
+        .cra_flags                      =       CRYPTO_ALG_TYPE_CIPHER |
+                                                        CRYPTO_ALG_NEED_FALLBACK,
+        .cra_init                       =       fallback_init_cip,
+        .cra_exit                       =       fallback_exit_cip,
         .cra_blocksize          =       AES_MIN_BLOCK_SIZE,
         .cra_ctxsize            =       sizeof(struct geode_aes_op),
-        .cra_module             =       THIS_MODULE,
-        .cra_list               =       LIST_HEAD_INIT(geode_alg.cra_list),
-        .cra_u                  =       {
-                .cipher = {
-                        .cia_min_keysize        =  AES_KEY_LENGTH,
-                        .cia_max_keysize        =  AES_KEY_LENGTH,
-                        .cia_setkey             =  geode_setkey,
-                        .cia_encrypt            =  geode_encrypt,
-                        .cia_decrypt            =  geode_decrypt
+        .cra_module                     =       THIS_MODULE,
+        .cra_list                       =       LIST_HEAD_INIT(geode_alg.cra_list),
+        .cra_u                          =       {
+                .cipher =       {
+                        .cia_min_keysize        =       AES_MIN_KEY_SIZE,
+                        .cia_max_keysize        =       AES_MAX_KEY_SIZE,
+                        .cia_setkey                     =       geode_setkey_cip,
+                        .cia_encrypt            =       geode_encrypt,
+                        .cia_decrypt            =       geode_decrypt
                 }
         }
 };
@@ -195,6 +310,9 @@ geode_cbc_decrypt(struct blkcipher_desc *desc,
         struct blkcipher_walk walk;
         int err, ret;
 
+        if (unlikely(op->keylen != AES_KEYSIZE_128))
+                return fallback_blk_dec(desc, dst, src, nbytes);
+
         blkcipher_walk_init(&walk, dst, src, nbytes);
         err = blkcipher_walk_virt(desc, &walk);
         memcpy(op->iv, walk.iv, AES_IV_LENGTH);
@@ -225,6 +343,9 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
         struct blkcipher_walk walk;
         int err, ret;
 
+        if (unlikely(op->keylen != AES_KEYSIZE_128))
+                return fallback_blk_enc(desc, dst, src, nbytes);
+
         blkcipher_walk_init(&walk, dst, src, nbytes);
         err = blkcipher_walk_virt(desc, &walk);
         memcpy(op->iv, walk.iv, AES_IV_LENGTH);
@@ -245,22 +366,49 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
         return err;
 }
 
+static int fallback_init_blk(struct crypto_tfm *tfm)
+{
+        const char *name = tfm->__crt_alg->cra_name;
+        struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+
+        op->fallback.blk = crypto_alloc_blkcipher(name, 0,
+                        CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
+
+        if (IS_ERR(op->fallback.blk)) {
+                printk(KERN_ERR "Error allocating fallback algo %s\n", name);
+                return PTR_ERR(op->fallback.blk);
+        }
+
+        return 0;
+}
+
+static void fallback_exit_blk(struct crypto_tfm *tfm)
+{
+        struct geode_aes_op *op = crypto_tfm_ctx(tfm);
+
+        crypto_free_blkcipher(op->fallback.blk);
+        op->fallback.blk = NULL;
+}
+
 static struct crypto_alg geode_cbc_alg = {
         .cra_name               =       "cbc(aes)",
-        .cra_driver_name        =       "cbc-aes-geode-128",
+        .cra_driver_name        =       "cbc-aes-geode",
         .cra_priority           =       400,
-        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
+        .cra_flags                      =       CRYPTO_ALG_TYPE_BLKCIPHER |
+                                                        CRYPTO_ALG_NEED_FALLBACK,
+        .cra_init                       =       fallback_init_blk,
+        .cra_exit                       =       fallback_exit_blk,
         .cra_blocksize          =       AES_MIN_BLOCK_SIZE,
         .cra_ctxsize            =       sizeof(struct geode_aes_op),
         .cra_alignmask          =       15,
-        .cra_type               =       &crypto_blkcipher_type,
-        .cra_module             =       THIS_MODULE,
-        .cra_list               =       LIST_HEAD_INIT(geode_cbc_alg.cra_list),
-        .cra_u                  =       {
-                .blkcipher = {
-                        .min_keysize            =       AES_KEY_LENGTH,
-                        .max_keysize            =       AES_KEY_LENGTH,
-                        .setkey                 =       geode_setkey,
+        .cra_type                       =       &crypto_blkcipher_type,
+        .cra_module                     =       THIS_MODULE,
+        .cra_list                       =       LIST_HEAD_INIT(geode_cbc_alg.cra_list),
+        .cra_u                          =       {
+                .blkcipher      =       {
+                        .min_keysize    =       AES_MIN_KEY_SIZE,
+                        .max_keysize    =       AES_MAX_KEY_SIZE,
+                        .setkey                 =       geode_setkey_blk,
                         .encrypt                =       geode_cbc_encrypt,
                         .decrypt                =       geode_cbc_decrypt,
                         .ivsize                 =       AES_IV_LENGTH,
@@ -277,6 +425,9 @@ geode_ecb_decrypt(struct blkcipher_desc *desc,
         struct blkcipher_walk walk;
         int err, ret;
 
+        if (unlikely(op->keylen != AES_KEYSIZE_128))
+                return fallback_blk_dec(desc, dst, src, nbytes);
+
         blkcipher_walk_init(&walk, dst, src, nbytes);
         err = blkcipher_walk_virt(desc, &walk);
 
@@ -304,6 +455,9 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
         struct blkcipher_walk walk;
         int err, ret;
 
+        if (unlikely(op->keylen != AES_KEYSIZE_128))
+                return fallback_blk_enc(desc, dst, src, nbytes);
+
         blkcipher_walk_init(&walk, dst, src, nbytes);
         err = blkcipher_walk_virt(desc, &walk);
 
@@ -323,21 +477,24 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
 }
 
 static struct crypto_alg geode_ecb_alg = {
-        .cra_name               =       "ecb(aes)",
-        .cra_driver_name        =       "ecb-aes-geode-128",
+        .cra_name                       =       "ecb(aes)",
+        .cra_driver_name        =       "ecb-aes-geode",
         .cra_priority           =       400,
-        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
+        .cra_flags                      =       CRYPTO_ALG_TYPE_BLKCIPHER |
+                                                        CRYPTO_ALG_NEED_FALLBACK,
+        .cra_init                       =       fallback_init_blk,
+        .cra_exit                       =       fallback_exit_blk,
         .cra_blocksize          =       AES_MIN_BLOCK_SIZE,
         .cra_ctxsize            =       sizeof(struct geode_aes_op),
         .cra_alignmask          =       15,
-        .cra_type               =       &crypto_blkcipher_type,
-        .cra_module             =       THIS_MODULE,
-        .cra_list               =       LIST_HEAD_INIT(geode_ecb_alg.cra_list),
-        .cra_u                  =       {
-                .blkcipher = {
-                        .min_keysize            =       AES_KEY_LENGTH,
-                        .max_keysize            =       AES_KEY_LENGTH,
-                        .setkey                 =       geode_setkey,
+        .cra_type                       =       &crypto_blkcipher_type,
+        .cra_module                     =       THIS_MODULE,
+        .cra_list                       =       LIST_HEAD_INIT(geode_ecb_alg.cra_list),
+        .cra_u                          =       {
+                .blkcipher      =       {
+                        .min_keysize    =       AES_MIN_KEY_SIZE,
+                        .max_keysize    =       AES_MAX_KEY_SIZE,
+                        .setkey                 =       geode_setkey_blk,
                         .encrypt                =       geode_ecb_encrypt,
                         .decrypt                =       geode_ecb_decrypt,
                 }
@@ -367,7 +524,7 @@ geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
         if ((ret = pci_enable_device(dev)))
                 return ret;
 
-        if ((ret = pci_request_regions(dev, "geode-aes-128")))
+        if ((ret = pci_request_regions(dev, "geode-aes")))
                 goto eenable;
 
         _iobase = pci_iomap(dev, 0, 0);
diff --git a/drivers/crypto/geode-aes.h b/drivers/crypto/geode-aes.h
index 2f1d55982aac..14cc763da1e4 100644
--- a/drivers/crypto/geode-aes.h
+++ b/drivers/crypto/geode-aes.h
@@ -66,6 +66,12 @@ struct geode_aes_op {
 
         u8 key[AES_KEY_LENGTH];
         u8 iv[AES_IV_LENGTH];
+
+        union {
+                struct crypto_blkcipher *blk;
+                struct crypto_cipher *cip;
+        } fallback;
+        u32 keylen;
 };
 
 #endif