[dpdk-dev] [PATCH 2/2] crypto/aesni_gcm: allow device init if no AES-NI is present

[Pablo de Lara <pablo.de.lara.guarch@intel.com>]

The IPSec Multi buffer library does not require AES-NI
instructions to be supported by the CPU, as it can emulate these
instructions in software (adding a big performance penalty when
using AES algorithms).

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
---
 drivers/crypto/aesni_gcm/aesni_gcm_pmd.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c b/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
index 1006a5c..0c4efa6 100644
--- a/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
+++ b/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
@@ -491,11 +491,6 @@ aesni_gcm_create(const char *name,
 	enum aesni_gcm_vector_mode vector_mode;
 	MB_MGR *mb_mgr;
 
-	/* Check CPU for support for AES instruction set */
-	if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_AES)) {
-		AESNI_GCM_LOG(ERR, "AES instructions not supported by CPU");
-		return -EFAULT;
-	}
 	dev = rte_cryptodev_pmd_create(name, &vdev->device, init_params);
 	if (dev == NULL) {
 		AESNI_GCM_LOG(ERR, "driver %s: create failed",
@@ -522,10 +517,15 @@ aesni_gcm_create(const char *name,
 
 	dev->feature_flags = RTE_CRYPTODEV_FF_SYMMETRIC_CRYPTO |
 			RTE_CRYPTODEV_FF_SYM_OPERATION_CHAINING |
-			RTE_CRYPTODEV_FF_CPU_AESNI |
 			RTE_CRYPTODEV_FF_OOP_SGL_IN_LB_OUT |
 			RTE_CRYPTODEV_FF_OOP_LB_IN_LB_OUT;
 
+	/* Check CPU for support for AES instruction set */
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AES))
+		dev->feature_flags |= RTE_CRYPTODEV_FF_CPU_AESNI;
+        else
+		AESNI_GCM_LOG(WARNING, "AES instructions not supported by CPU");
+
 	mb_mgr = alloc_mb_mgr(0);
 	if (mb_mgr == NULL)
 		return -ENOMEM;
-- 
2.7.5