[PATCH 1/5] crypto/openssl: fix GCM and CCM thread unsafe ctxs

[Jack Bond-Preston <jack.bond-preston@foss.arm.com>]

Commit 67ab783b5d70 ("crypto/openssl: use local copy for session
contexts") introduced a fix for concurrency bugs which could occur when
using one OpenSSL PMD session across multiple cores simultaneously. The
solution was to clone the EVP contexts per-buffer to avoid them being
used concurrently.

However, part of commit 75adf1eae44f ("crypto/openssl: update HMAC
routine with 3.0 EVP API") reverted this fix, only for combined ops
(AES-GCM and AES-CCM), with no explanation. This commit fixes the issue
again, essentially reverting this part of the commit.

Throughput performance uplift measurements for AES-GCM-128 encrypt on
Ampere Altra Max platform:
1 worker lcore
|   buffer sz (B) |   prev (Gbps) |   optimised (Gbps) |   uplift |
|-----------------+---------------+--------------------+----------|
|              64 |          2.60 |               1.31 |   -49.5% |
|             256 |          7.69 |               4.45 |   -42.1% |
|            1024 |         15.33 |              11.30 |   -26.3% |
|            2048 |         18.74 |              15.37 |   -18.0% |
|            4096 |         21.11 |              18.80 |   -10.9% |

8 worker lcores
|   buffer sz (B) |   prev (Gbps) |   optimised (Gbps) |   uplift |
|-----------------+---------------+--------------------+----------|
|              64 |         19.94 |               2.83 |   -85.8% |
|             256 |         58.84 |              11.00 |   -81.3% |
|            1024 |        119.71 |              42.46 |   -64.5% |
|            2048 |        147.69 |              80.91 |   -45.2% |
|            4096 |        167.39 |             121.25 |   -27.6% |

Fixes: 75adf1eae44f ("crypto/openssl: update HMAC routine with 3.0 EVP API")
Cc: stable@dpdk.org
Signed-off-by: Jack Bond-Preston <jack.bond-preston@foss.arm.com>
Reviewed-by: Wathsala Vithanage <wathsala.vithanage@arm.com>
---
 drivers/crypto/openssl/rte_openssl_pmd.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/openssl/rte_openssl_pmd.c b/drivers/crypto/openssl/rte_openssl_pmd.c
index e8cb09defc..ca7ed30ec4 100644
--- a/drivers/crypto/openssl/rte_openssl_pmd.c
+++ b/drivers/crypto/openssl/rte_openssl_pmd.c
@@ -1590,6 +1590,9 @@ process_openssl_combined_op
 		return;
 	}
 
+	EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
+	EVP_CIPHER_CTX_copy(ctx, sess->cipher.ctx);
+
 	iv = rte_crypto_op_ctod_offset(op, uint8_t *,
 			sess->iv.offset);
 	if (sess->auth.algo == RTE_CRYPTO_AUTH_AES_GMAC) {
@@ -1623,12 +1626,12 @@ process_openssl_combined_op
 			status = process_openssl_auth_encryption_gcm(
 					mbuf_src, offset, srclen,
 					aad, aadlen, iv,
-					dst, tag, sess->cipher.ctx);
+					dst, tag, ctx);
 		else
 			status = process_openssl_auth_encryption_ccm(
 					mbuf_src, offset, srclen,
 					aad, aadlen, iv,
-					dst, tag, taglen, sess->cipher.ctx);
+					dst, tag, taglen, ctx);
 
 	} else {
 		if (sess->auth.algo == RTE_CRYPTO_AUTH_AES_GMAC ||
@@ -1636,14 +1639,16 @@ process_openssl_combined_op
 			status = process_openssl_auth_decryption_gcm(
 					mbuf_src, offset, srclen,
 					aad, aadlen, iv,
-					dst, tag, sess->cipher.ctx);
+					dst, tag, ctx);
 		else
 			status = process_openssl_auth_decryption_ccm(
 					mbuf_src, offset, srclen,
 					aad, aadlen, iv,
-					dst, tag, taglen, sess->cipher.ctx);
+					dst, tag, taglen, ctx);
 	}
 
+	EVP_CIPHER_CTX_free(ctx);
+
 	if (status != 0) {
 		if (status == (-EFAULT) &&
 				sess->auth.operation ==
-- 
2.34.1