crypto: caam - add Derived Key Protocol (DKP) support

Offload split key generation in CAAM engine, using DKP.
DKP is supported starting with Era 6.

Note that the way assoclen is transmitted from the job descriptor
to the shared descriptor changes - DPOVRD register is used instead
of MATH3 (where available), since DKP protocol thrashes the MATH
registers.

The replacement of MDHA split key generation with DKP has the side
effect of the crypto engine writing the authentication key, and thus
the DMA mapping direction for the buffer holding the key has to change
from DMA_TO_DEVICE to DMA_BIDIRECTIONAL.
There are two cases:
-key is inlined in descriptor - descriptor buffer mapping changes
-key is referenced - key buffer mapping changes

Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 107 insertions, 69 deletions

diff --git a/drivers/crypto/caam/caamalg_desc.c b/drivers/crypto/caam/caamalg_desc.c
index 2db9e85bf81c..ceb93fbb76e6 100644
--- a/drivers/crypto/caam/caamalg_desc.c
+++ b/drivers/crypto/caam/caamalg_desc.c
@@ -45,16 +45,16 @@ static inline void append_dec_op1(u32 *desc, u32 type)
  * cnstr_shdsc_aead_null_encap - IPSec ESP encapsulation shared descriptor
  *                               (non-protocol) with no (null) encryption.
  * @desc: pointer to buffer used for descriptor construction
- * @adata: pointer to authentication transform definitions. Note that since a
- *         split key is to be used, the size of the split key itself is
- *         specified. Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1,
- *         SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case. Valid algorithm values - one of
+ *         OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed
+ *         with OP_ALG_AAI_HMAC_PRECOMP.
  * @icvsize: integrity check value (ICV) size (truncated or full)
- *
- * Note: Requires an MDHA split key.
+ * @era: SEC Era
  */
 void cnstr_shdsc_aead_null_encap(u32 * const desc, struct alginfo *adata,
-				 unsigned int icvsize)
+				 unsigned int icvsize, int era)
 {
 	u32 *key_jump_cmd, *read_move_cmd, *write_move_cmd;
 
@@ -63,13 +63,18 @@ void cnstr_shdsc_aead_null_encap(u32 * const desc, struct alginfo *adata,
 	/* Skip if already shared */
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
-	if (adata->key_inline)
-		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
-				  adata->keylen, CLASS_2 | KEY_DEST_MDHA_SPLIT |
-				  KEY_ENC);
-	else
-		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
-			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	if (era < 6) {
+		if (adata->key_inline)
+			append_key_as_imm(desc, adata->key_virt,
+					  adata->keylen_pad, adata->keylen,
+					  CLASS_2 | KEY_DEST_MDHA_SPLIT |
+					  KEY_ENC);
+		else
+			append_key(desc, adata->key_dma, adata->keylen,
+				   CLASS_2 | KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	} else {
+		append_proto_dkp(desc, adata);
+	}
 	set_jump_tgt_here(desc, key_jump_cmd);
 
 	/* assoclen + cryptlen = seqinlen */
@@ -121,16 +126,16 @@ EXPORT_SYMBOL(cnstr_shdsc_aead_null_encap);
  * cnstr_shdsc_aead_null_decap - IPSec ESP decapsulation shared descriptor
  *                               (non-protocol) with no (null) decryption.
  * @desc: pointer to buffer used for descriptor construction
- * @adata: pointer to authentication transform definitions. Note that since a
- *         split key is to be used, the size of the split key itself is
- *         specified. Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1,
- *         SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case. Valid algorithm values - one of
+ *         OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed
+ *         with OP_ALG_AAI_HMAC_PRECOMP.
  * @icvsize: integrity check value (ICV) size (truncated or full)
- *
- * Note: Requires an MDHA split key.
+ * @era: SEC Era
  */
 void cnstr_shdsc_aead_null_decap(u32 * const desc, struct alginfo *adata,
-				 unsigned int icvsize)
+				 unsigned int icvsize, int era)
 {
 	u32 *key_jump_cmd, *read_move_cmd, *write_move_cmd, *jump_cmd;
 
@@ -139,13 +144,18 @@ void cnstr_shdsc_aead_null_decap(u32 * const desc, struct alginfo *adata,
 	/* Skip if already shared */
 	key_jump_cmd = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
 				   JUMP_COND_SHRD);
-	if (adata->key_inline)
-		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
-				  adata->keylen, CLASS_2 |
-				  KEY_DEST_MDHA_SPLIT | KEY_ENC);
-	else
-		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
-			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	if (era < 6) {
+		if (adata->key_inline)
+			append_key_as_imm(desc, adata->key_virt,
+					  adata->keylen_pad, adata->keylen,
+					  CLASS_2 | KEY_DEST_MDHA_SPLIT |
+					  KEY_ENC);
+		else
+			append_key(desc, adata->key_dma, adata->keylen,
+				   CLASS_2 | KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	} else {
+		append_proto_dkp(desc, adata);
+	}
 	set_jump_tgt_here(desc, key_jump_cmd);
 
 	/* Class 2 operation */
@@ -204,7 +214,7 @@ EXPORT_SYMBOL(cnstr_shdsc_aead_null_decap);
 static void init_sh_desc_key_aead(u32 * const desc,
 				  struct alginfo * const cdata,
 				  struct alginfo * const adata,
-				  const bool is_rfc3686, u32 *nonce)
+				  const bool is_rfc3686, u32 *nonce, int era)
 {
 	u32 *key_jump_cmd;
 	unsigned int enckeylen = cdata->keylen;
@@ -224,13 +234,18 @@ static void init_sh_desc_key_aead(u32 * const desc,
 	if (is_rfc3686)
 		enckeylen -= CTR_RFC3686_NONCE_SIZE;
 
-	if (adata->key_inline)
-		append_key_as_imm(desc, adata->key_virt, adata->keylen_pad,
-				  adata->keylen, CLASS_2 |
-				  KEY_DEST_MDHA_SPLIT | KEY_ENC);
-	else
-		append_key(desc, adata->key_dma, adata->keylen, CLASS_2 |
-			   KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	if (era < 6) {
+		if (adata->key_inline)
+			append_key_as_imm(desc, adata->key_virt,
+					  adata->keylen_pad, adata->keylen,
+					  CLASS_2 | KEY_DEST_MDHA_SPLIT |
+					  KEY_ENC);
+		else
+			append_key(desc, adata->key_dma, adata->keylen,
+				   CLASS_2 | KEY_DEST_MDHA_SPLIT | KEY_ENC);
+	} else {
+		append_proto_dkp(desc, adata);
+	}
 
 	if (cdata->key_inline)
 		append_key_as_imm(desc, cdata->key_virt, enckeylen,
@@ -261,26 +276,27 @@ static void init_sh_desc_key_aead(u32 * const desc,
  * @cdata: pointer to block cipher transform definitions
  *         Valid algorithm values - one of OP_ALG_ALGSEL_{AES, DES, 3DES} ANDed
  *         with OP_ALG_AAI_CBC or OP_ALG_AAI_CTR_MOD128.
- * @adata: pointer to authentication transform definitions. Note that since a
- *         split key is to be used, the size of the split key itself is
- *         specified. Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1,
- *         SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case. Valid algorithm values - one of
+ *         OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed
+ *         with OP_ALG_AAI_HMAC_PRECOMP.
  * @ivsize: initialization vector size
  * @icvsize: integrity check value (ICV) size (truncated or full)
  * @is_rfc3686: true when ctr(aes) is wrapped by rfc3686 template
  * @nonce: pointer to rfc3686 nonce
  * @ctx1_iv_off: IV offset in CONTEXT1 register
  * @is_qi: true when called from caam/qi
- *
- * Note: Requires an MDHA split key.
+ * @era: SEC Era
  */
 void cnstr_shdsc_aead_encap(u32 * const desc, struct alginfo *cdata,
 			    struct alginfo *adata, unsigned int ivsize,
 			    unsigned int icvsize, const bool is_rfc3686,
-			    u32 *nonce, const u32 ctx1_iv_off, const bool is_qi)
+			    u32 *nonce, const u32 ctx1_iv_off, const bool is_qi,
+			    int era)
 {
 	/* Note: Context registers are saved. */
-	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce);
+	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce, era);
 
 	/* Class 2 operation */
 	append_operation(desc, adata->algtype | OP_ALG_AS_INITFINAL |
@@ -306,8 +322,13 @@ void cnstr_shdsc_aead_encap(u32 * const desc, struct alginfo *cdata,
 	}
 
 	/* Read and write assoclen bytes */
-	append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
-	append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
+	if (is_qi || era < 3) {
+		append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
+		append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
+	} else {
+		append_math_add(desc, VARSEQINLEN, ZERO, DPOVRD, CAAM_CMD_SZ);
+		append_math_add(desc, VARSEQOUTLEN, ZERO, DPOVRD, CAAM_CMD_SZ);
+	}
 
 	/* Skip assoc data */
 	append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);
@@ -350,27 +371,27 @@ EXPORT_SYMBOL(cnstr_shdsc_aead_encap);
  * @cdata: pointer to block cipher transform definitions
  *         Valid algorithm values - one of OP_ALG_ALGSEL_{AES, DES, 3DES} ANDed
  *         with OP_ALG_AAI_CBC or OP_ALG_AAI_CTR_MOD128.
- * @adata: pointer to authentication transform definitions. Note that since a
- *         split key is to be used, the size of the split key itself is
- *         specified. Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1,
- *         SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case. Valid algorithm values - one of
+ *         OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed
+ *         with OP_ALG_AAI_HMAC_PRECOMP.
  * @ivsize: initialization vector size
  * @icvsize: integrity check value (ICV) size (truncated or full)
  * @is_rfc3686: true when ctr(aes) is wrapped by rfc3686 template
  * @nonce: pointer to rfc3686 nonce
  * @ctx1_iv_off: IV offset in CONTEXT1 register
  * @is_qi: true when called from caam/qi
- *
- * Note: Requires an MDHA split key.
+ * @era: SEC Era
  */
 void cnstr_shdsc_aead_decap(u32 * const desc, struct alginfo *cdata,
 			    struct alginfo *adata, unsigned int ivsize,
 			    unsigned int icvsize, const bool geniv,
 			    const bool is_rfc3686, u32 *nonce,
-			    const u32 ctx1_iv_off, const bool is_qi)
+			    const u32 ctx1_iv_off, const bool is_qi, int era)
 {
 	/* Note: Context registers are saved. */
-	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce);
+	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce, era);
 
 	/* Class 2 operation */
 	append_operation(desc, adata->algtype | OP_ALG_AS_INITFINAL |
@@ -397,11 +418,23 @@ void cnstr_shdsc_aead_decap(u32 * const desc, struct alginfo *cdata,
 	}
 
 	/* Read and write assoclen bytes */
-	append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
-	if (geniv)
-		append_math_add_imm_u32(desc, VARSEQOUTLEN, REG3, IMM, ivsize);
-	else
-		append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
+	if (is_qi || era < 3) {
+		append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
+		if (geniv)
+			append_math_add_imm_u32(desc, VARSEQOUTLEN, REG3, IMM,
+						ivsize);
+		else
+			append_math_add(desc, VARSEQOUTLEN, ZERO, REG3,
+					CAAM_CMD_SZ);
+	} else {
+		append_math_add(desc, VARSEQINLEN, ZERO, DPOVRD, CAAM_CMD_SZ);
+		if (geniv)
+			append_math_add_imm_u32(desc, VARSEQOUTLEN, DPOVRD, IMM,
+						ivsize);
+		else
+			append_math_add(desc, VARSEQOUTLEN, ZERO, DPOVRD,
+					CAAM_CMD_SZ);
+	}
 
 	/* Skip assoc data */
 	append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);
@@ -456,29 +489,29 @@ EXPORT_SYMBOL(cnstr_shdsc_aead_decap);
  * @cdata: pointer to block cipher transform definitions
  *         Valid algorithm values - one of OP_ALG_ALGSEL_{AES, DES, 3DES} ANDed
  *         with OP_ALG_AAI_CBC or OP_ALG_AAI_CTR_MOD128.
- * @adata: pointer to authentication transform definitions. Note that since a
- *         split key is to be used, the size of the split key itself is
- *         specified. Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1,
- *         SHA224, SHA256, SHA384, SHA512} ANDed with OP_ALG_AAI_HMAC_PRECOMP.
+ * @adata: pointer to authentication transform definitions.
+ *         A split key is required for SEC Era < 6; the size of the split key
+ *         is specified in this case. Valid algorithm values - one of
+ *         OP_ALG_ALGSEL_{MD5, SHA1, SHA224, SHA256, SHA384, SHA512} ANDed
+ *         with OP_ALG_AAI_HMAC_PRECOMP.
  * @ivsize: initialization vector size
  * @icvsize: integrity check value (ICV) size (truncated or full)
  * @is_rfc3686: true when ctr(aes) is wrapped by rfc3686 template
  * @nonce: pointer to rfc3686 nonce
  * @ctx1_iv_off: IV offset in CONTEXT1 register
  * @is_qi: true when called from caam/qi
- *
- * Note: Requires an MDHA split key.
+ * @era: SEC Era
  */
 void cnstr_shdsc_aead_givencap(u32 * const desc, struct alginfo *cdata,
 			       struct alginfo *adata, unsigned int ivsize,
 			       unsigned int icvsize, const bool is_rfc3686,
 			       u32 *nonce, const u32 ctx1_iv_off,
-			       const bool is_qi)
+			       const bool is_qi, int era)
 {
 	u32 geniv, moveiv;
 
 	/* Note: Context registers are saved. */
-	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce);
+	init_sh_desc_key_aead(desc, cdata, adata, is_rfc3686, nonce, era);
 
 	if (is_qi) {
 		u32 *wait_load_cmd;
@@ -528,8 +561,13 @@ copy_iv:
 			 OP_ALG_ENCRYPT);
 
 	/* Read and write assoclen bytes */
-	append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
-	append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
+	if (is_qi || era < 3) {
+		append_math_add(desc, VARSEQINLEN, ZERO, REG3, CAAM_CMD_SZ);
+		append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);
+	} else {
+		append_math_add(desc, VARSEQINLEN, ZERO, DPOVRD, CAAM_CMD_SZ);
+		append_math_add(desc, VARSEQOUTLEN, ZERO, DPOVRD, CAAM_CMD_SZ);
+	}
 
 	/* Skip assoc data */
 	append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);