netdev - [PATCH net-next 2/2] nfp: add support CHACHA20-POLY1305 offload for ipsec

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Date: Wed, 19 Jul 2023 11:18:30 +0200
From: Louis Peens <louis.peens@...igine.com>
To: David Miller <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Leon Romanovsky <leon@...nel.org>,
	Simon Horman <simon.horman@...igine.com>,
	Shihong Wang <shihong.wang@...igine.com>,
	netdev@...r.kernel.org,
	oss-drivers@...igine.com
Subject: [PATCH net-next 2/2] nfp: add support CHACHA20-POLY1305 offload for ipsec

From: Shihong Wang <shihong.wang@...igine.com>

Add the configuration of CHACHA20-POLY1305 to the driver and send the
message to hardware so that the NIC supports the algorithm.

Signed-off-by: Shihong Wang <shihong.wang@...igine.com>
Acked-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Louis Peens <louis.peens@...igine.com>
---
 .../net/ethernet/netronome/nfp/crypto/ipsec.c | 42 +++++++++++++++++--
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/crypto/ipsec.c b/drivers/net/ethernet/netronome/nfp/crypto/ipsec.c
index b1f026b81dea..6b8a1874e4fc 100644
--- a/drivers/net/ethernet/netronome/nfp/crypto/ipsec.c
+++ b/drivers/net/ethernet/netronome/nfp/crypto/ipsec.c
@@ -421,12 +421,38 @@ static int nfp_net_xfrm_add_state(struct xfrm_state *x,
 			return -EINVAL;
 		}
 		break;
+	case SADB_X_EALG_CHACHA20_POLY1305:
+		if (nn->pdev->device != PCI_DEVICE_ID_NFP3800) {
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported encryption algorithm for offload");
+			return -EINVAL;
+		}
+		if (!x->aead) {
+			NL_SET_ERR_MSG_MOD(extack, "Invalid CHACHA20 key data");
+			return -EINVAL;
+		}
+		if (x->aead->alg_icv_len != 128) {
+			NL_SET_ERR_MSG_MOD(extack,
+					   "ICV must be 128bit with SADB_X_EALG_CHACHA20_POLY1305");
+			return -EINVAL;
+		}
+
+		/* Aead->alg_key_len includes 32-bit salt */
+		if (x->aead->alg_key_len - 32 != 256) {
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported CHACHA20 key length");
+			return -EINVAL;
+		}
+
+		/* The CHACHA20's mode is not configured */
+		cfg->ctrl_word.hash = NFP_IPSEC_HASH_POLY1305_128;
+		cfg->ctrl_word.cipher = NFP_IPSEC_CIPHER_CHACHA20;
+		break;
 	default:
 		NL_SET_ERR_MSG_MOD(extack, "Unsupported encryption algorithm for offload");
 		return -EINVAL;
 	}
 
 	if (x->aead) {
+		int key_offset = 0;
 		int salt_len = 4;
 
 		key_len = DIV_ROUND_UP(x->aead->alg_key_len, BITS_PER_BYTE);
@@ -437,9 +463,19 @@ static int nfp_net_xfrm_add_state(struct xfrm_state *x,
 			return -EINVAL;
 		}
 
-		for (i = 0; i < key_len / sizeof(cfg->ciph_key[0]) ; i++)
-			cfg->ciph_key[i] = get_unaligned_be32(x->aead->alg_key +
-							      sizeof(cfg->ciph_key[0]) * i);
+		/* The CHACHA20's key order needs to be adjusted based on hardware design.
+		 * Other's key order: {K0, K1, K2, K3, K4, K5, K6, K7}
+		 * CHACHA20's key order: {K4, K5, K6, K7, K0, K1, K2, K3}
+		 */
+		if (x->props.ealgo == SADB_X_EALG_CHACHA20_POLY1305)
+			key_offset = key_len / sizeof(cfg->ciph_key[0]) >> 1;
+
+		for (i = 0; i < key_len / sizeof(cfg->ciph_key[0]); i++) {
+			int index = (i + key_offset) % (key_len / sizeof(cfg->ciph_key[0]));
+
+			cfg->ciph_key[index] = get_unaligned_be32(x->aead->alg_key +
+								  sizeof(cfg->ciph_key[0]) * i);
+		}
 
 		/* Load up the salt */
 		cfg->aesgcm_fields.salt = get_unaligned_be32(x->aead->alg_key + key_len);
-- 
2.34.1