[PATCH v1] drivers/crypto: cipher buffer alignment check

[Sivaramakrishnan VenkatX <venkatx.sivaramakrishnan@intel.com>]

Cipher length alignment checked for 3DES-CBC and AES-CBC to avoid slice
hang error in QAT CPM1.8

Signed-off-by: Sivaramakrishnan VenkatX <venkatx.sivaramakrishnan@intel.com>
---
 drivers/crypto/qat/dev/qat_crypto_pmd_gens.h | 21 ++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h b/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
index cab7e214c0..98504d925f 100644
--- a/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
+++ b/drivers/crypto/qat/dev/qat_crypto_pmd_gens.h
@@ -10,6 +10,13 @@
 #include "qat_sym_session.h"
 #include "qat_sym.h"
 
+#define AES_OR_3DES_MISALIGNED (ctx->qat_mode == ICP_QAT_HW_CIPHER_CBC_MODE && \
+			((((ctx->qat_cipher_alg == ICP_QAT_HW_CIPHER_ALGO_AES128) || \
+			(ctx->qat_cipher_alg == ICP_QAT_HW_CIPHER_ALGO_AES192) || \
+			(ctx->qat_cipher_alg == ICP_QAT_HW_CIPHER_ALGO_AES256)) && \
+			(cipher_param->cipher_length % ICP_QAT_HW_AES_BLK_SZ)) || \
+			((ctx->qat_cipher_alg == ICP_QAT_HW_CIPHER_ALGO_3DES) && \
+			(cipher_param->cipher_length % ICP_QAT_HW_3DES_BLK_SZ))))
 #define QAT_SYM_DP_GET_MAX_ENQ(q, c, n) \
 	RTE_MIN((q->max_inflights - q->enqueued + q->dequeued - c), n)
 
@@ -699,6 +706,20 @@ enqueue_one_chain_job_gen1(struct qat_sym_session *ctx,
 
 	cipher_param->cipher_offset = ofs.ofs.cipher.head;
 	cipher_param->cipher_length = cipher_len;
+	/* Input cipher length alignment requirement for 3DES-CBC and AES-CBC.
+	 * For 3DES-CBC cipher algo, ESP Payload size requires 8 Byte aligned.
+	 * For AES-CBC cipher algo, ESP Payload size requires 16 Byte aligned.
+	 * The alignment should be guaranteed by the ESP package padding field
+	 * according to the RFC4303. Under this condition, QAT will pass through
+	 * chain job as NULL cipher and NULL auth operation and report misalignment
+	 * error detected.
+	 */
+	if (AES_OR_3DES_MISALIGNED) {
+		QAT_LOG(ERR, "Input cipher length alignment error detected.\n");
+		ctx->qat_cipher_alg = ICP_QAT_HW_CIPHER_ALGO_NULL;
+		ctx->qat_hash_alg = ICP_QAT_HW_AUTH_ALGO_NULL;
+		cipher_param->cipher_length = 0;
+	}
 	qat_set_cipher_iv(cipher_param, cipher_iv, ctx->cipher_iv.length, req);
 
 	auth_param->auth_off = ofs.ofs.auth.head;
-- 
2.25.1