linux-kernel - [PATCH v2 3/9] crypto: virtio: Add algo pointer in virtio_crypto_skcipher

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Message-Id: <20251204112227.2659404-4-maobibo@loongson.cn>
Date: Thu,  4 Dec 2025 19:22:20 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Gonglei <arei.gonglei@...wei.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Cc: virtualization@...ts.linux.dev,
	linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/9] crypto: virtio: Add algo pointer in virtio_crypto_skcipher_ctx

Structure virtio_crypto_skcipher_ctx is allocated together with
crypto_skcipher, and skcipher_alg is set in strucutre crypto_skcipher
when it is created.

Here add virtio_crypto_algo pointer in virtio_crypto_skcipher_ctx and
set it in function virtio_crypto_skcipher_init(). So crypto service
and algo can be acquired from virtio_crypto_algo pointer.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 20 ++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 1b3fb21a2a7d..d42c7a77cdbb 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -15,9 +15,11 @@
 #include "virtio_crypto_common.h"
 
 
+struct virtio_crypto_algo;
 struct virtio_crypto_skcipher_ctx {
 	struct virtio_crypto *vcrypto;
 
+	struct virtio_crypto_algo *alg;
 	struct virtio_crypto_sym_session_info enc_sess_info;
 	struct virtio_crypto_sym_session_info dec_sess_info;
 };
@@ -108,9 +110,7 @@ virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
 
 static int virtio_crypto_alg_skcipher_init_session(
 		struct virtio_crypto_skcipher_ctx *ctx,
-		uint32_t alg, const uint8_t *key,
-		unsigned int keylen,
-		int encrypt)
+		const uint8_t *key, unsigned int keylen, int encrypt)
 {
 	struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
@@ -140,7 +140,7 @@ static int virtio_crypto_alg_skcipher_init_session(
 	/* Pad ctrl header */
 	ctrl = &vc_ctrl_req->ctrl;
 	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
-	ctrl->header.algo = cpu_to_le32(alg);
+	ctrl->header.algo = cpu_to_le32(ctx->alg->algonum);
 	/* Set the default dataqueue id to 0 */
 	ctrl->header.queue_id = 0;
 
@@ -261,13 +261,11 @@ static int virtio_crypto_alg_skcipher_init_sessions(
 		return -EINVAL;
 
 	/* Create encryption session */
-	ret = virtio_crypto_alg_skcipher_init_session(ctx,
-			alg, key, keylen, 1);
+	ret = virtio_crypto_alg_skcipher_init_session(ctx, key, keylen, 1);
 	if (ret)
 		return ret;
 	/* Create decryption session */
-	ret = virtio_crypto_alg_skcipher_init_session(ctx,
-			alg, key, keylen, 0);
+	ret = virtio_crypto_alg_skcipher_init_session(ctx, key, keylen, 0);
 	if (ret) {
 		virtio_crypto_alg_skcipher_close_session(ctx, 1);
 		return ret;
@@ -293,7 +291,7 @@ static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
 		int node = virtio_crypto_get_current_node();
 		struct virtio_crypto *vcrypto =
 				      virtcrypto_get_dev_node(node,
-				      VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
+				      ctx->alg->service, ctx->alg->algonum);
 		if (!vcrypto) {
 			pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
 			return -ENODEV;
@@ -509,7 +507,11 @@ static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
 
 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
 {
+	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+
 	crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
+	ctx->alg = container_of(alg, struct virtio_crypto_algo, algo.base);
 
 	return 0;
 }
-- 
2.39.3