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Commit d28a43ed authored by Iuliana Prodan's avatar Iuliana Prodan Committed by Herbert Xu
Browse files

crypto: caam - update rfc4106 sh desc to support zero length input 



Update share descriptor for rfc4106 to skip instructions in case
cryptlen is zero. If no instructions are jumped the DECO hangs and a
timeout error is thrown.

Signed-off-by: default avatarIuliana Prodan <iuliana.prodan@nxp.com>
Reviewed-by: default avatarHoria Geanta <horia.geanta@nxp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 31bb2f0d

drivers/crypto/caam/caamalg_desc.c

+32 −15
Original line number Diff line number Diff line
@@ -852,13 +852,16 @@ EXPORT_SYMBOL(cnstr_shdsc_gcm_decap); 
 * @ivsize: initialization vector size

 * @icvsize: integrity check value (ICV) size (truncated or full)

 * @is_qi: true when called from caam/qi

 *

 * Input sequence: AAD | PTXT

 * Output sequence: AAD | CTXT | ICV

 * AAD length (assoclen), which includes the IV length, is available in Math3.

 */

void cnstr_shdsc_rfc4106_encap(u32 * const desc, struct alginfo *cdata,

			       unsigned int ivsize, unsigned int icvsize,

			       const bool is_qi)

{

	u32 *key_jump_cmd;



	u32 *key_jump_cmd, *zero_cryptlen_jump_cmd, *skip_instructions;

	init_sh_desc(desc, HDR_SHARE_SERIAL);



	/* Skip key loading if it is loaded due to sharing */
@@ -901,24 +904,26 @@ void cnstr_shdsc_rfc4106_encap(u32 * const desc, struct alginfo *cdata, 
	append_math_sub_imm_u32(desc, VARSEQINLEN, REG3, IMM, ivsize);

	append_math_add(desc, VARSEQOUTLEN, ZERO, REG3, CAAM_CMD_SZ);



	/* Read assoc data */

	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |

			     FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);

	/* Skip AAD */

	append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);



	/* Skip IV */

	append_seq_fifo_load(desc, ivsize, FIFOLD_CLASS_SKIP);

	/* Read cryptlen and set this value into VARSEQOUTLEN */

	append_math_sub(desc, VARSEQOUTLEN, SEQINLEN, REG3, CAAM_CMD_SZ);



	/* Will read cryptlen bytes */

	append_math_sub(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);

	/* If cryptlen is ZERO jump to AAD command */

	zero_cryptlen_jump_cmd = append_jump(desc, JUMP_TEST_ALL |

					    JUMP_COND_MATH_Z);



	/* Workaround for erratum A-005473 (simultaneous SEQ FIFO skips) */

	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_MSG);

	/* Read AAD data */

	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |

			     FIFOLD_TYPE_AAD | FIFOLD_TYPE_FLUSH1);



	/* Skip assoc data */

	append_seq_fifo_store(desc, 0, FIFOST_TYPE_SKIP | FIFOLDST_VLF);

	/* Workaround for erratum A-005473 (simultaneous SEQ FIFO skips) */

	append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA);



	/* cryptlen = seqoutlen - assoclen */

	append_math_sub(desc, VARSEQOUTLEN, VARSEQINLEN, REG0, CAAM_CMD_SZ);

	/* Skip IV */

	append_seq_fifo_load(desc, ivsize, FIFOLD_CLASS_SKIP);

	append_math_add(desc, VARSEQINLEN, VARSEQOUTLEN, REG0, CAAM_CMD_SZ);



	/* Write encrypted data */

	append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA | FIFOLDST_VLF);
@@ -927,6 +932,18 @@ void cnstr_shdsc_rfc4106_encap(u32 * const desc, struct alginfo *cdata, 
	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |

			     FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST1);



	/* Jump instructions to avoid double reading of AAD */

	skip_instructions = append_jump(desc, JUMP_TEST_ALL);



	/* There is no input data, cryptlen = 0 */

	set_jump_tgt_here(desc, zero_cryptlen_jump_cmd);



	/* Read AAD */

	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLDST_VLF |

			     FIFOLD_TYPE_AAD | FIFOLD_TYPE_LAST1);



	set_jump_tgt_here(desc, skip_instructions);



	/* Write ICV */

	append_seq_store(desc, icvsize, LDST_CLASS_1_CCB |

			 LDST_SRCDST_BYTE_CONTEXT);

drivers/crypto/caam/caamalg_desc.h

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ 
#define DESC_QI_GCM_DEC_LEN		(DESC_GCM_DEC_LEN + 3 * CAAM_CMD_SZ)



#define DESC_RFC4106_BASE		(3 * CAAM_CMD_SZ)

#define DESC_RFC4106_ENC_LEN		(DESC_RFC4106_BASE + 13 * CAAM_CMD_SZ)

#define DESC_RFC4106_ENC_LEN		(DESC_RFC4106_BASE + 16 * CAAM_CMD_SZ)

#define DESC_RFC4106_DEC_LEN		(DESC_RFC4106_BASE + 13 * CAAM_CMD_SZ)

#define DESC_QI_RFC4106_ENC_LEN		(DESC_RFC4106_ENC_LEN + 5 * CAAM_CMD_SZ)

#define DESC_QI_RFC4106_DEC_LEN		(DESC_RFC4106_DEC_LEN + 5 * CAAM_CMD_SZ)