[PATCH v2 12/15] crypto/cnxk: add support for packets with cipher len zero

[Tejasree Kondoj]

From: Aakash Sasidharan <asasidha...@marvell.com>

For cipher only zero length packets, submit it to CPT with
passthrough opcode.

Signed-off-by: Aakash Sasidharan <asasidha...@marvell.com>
---
 drivers/crypto/cnxk/cnxk_se.h | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/cnxk/cnxk_se.h b/drivers/crypto/cnxk/cnxk_se.h
index 1fbae54c76..f6884be5ad 100644
--- a/drivers/crypto/cnxk/cnxk_se.h
+++ b/drivers/crypto/cnxk/cnxk_se.h
@@ -45,7 +45,8 @@ struct cnxk_se_sess {
        uint8_t is_sm3 : 1;
        uint8_t passthrough : 1;
        uint8_t is_sm4 : 1;
-       uint8_t rsvd : 2;
+       uint8_t cipher_only : 1;
+       uint8_t rsvd : 1;
        uint8_t cpt_op : 4;
        uint8_t zsk_flag : 4;
        uint8_t zs_cipher : 4;
@@ -2192,6 +2193,7 @@ fill_sess_cipher(struct rte_crypto_sym_xform *xform, 
struct cnxk_se_sess *sess)
                }
        }
 
+       sess->cipher_only = 1;
        sess->zsk_flag = zsk_flag;
        sess->zs_cipher = zs_cipher;
        sess->aes_gcm = 0;
@@ -3308,9 +3310,19 @@ static __rte_always_inline int __rte_hot
 cpt_sym_inst_fill(struct cnxk_cpt_qp *qp, struct rte_crypto_op *op, struct 
cnxk_se_sess *sess,
                  struct cpt_inflight_req *infl_req, struct cpt_inst_s *inst, 
const bool is_sg_ver2)
 {
+       enum cpt_dp_thread_type dp_thr_type;
        int ret;
 
-       switch (sess->dp_thr_type) {
+       dp_thr_type = sess->dp_thr_type;
+
+       /*
+        * With cipher only, microcode expects that cipher length is non-zero. 
To accept such
+        * instructions, send to CPT as passthrough.
+        */
+       if (unlikely(sess->cipher_only && op->sym->cipher.data.length == 0))
+               dp_thr_type = CPT_DP_THREAD_TYPE_PT;
+
+       switch (dp_thr_type) {
        case CPT_DP_THREAD_TYPE_PT:
                ret = fill_passthrough_params(op, inst);
                break;
-- 
2.25.1