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Date: Fri, 6 May 2022 08:46:05 +0000
From: "Gonglei (Arei)" <arei.gonglei@...wei.com>
To: zhenwei pi <pizhenwei@...edance.com>,
"mst@...hat.com" <mst@...hat.com>
CC: "jasowang@...hat.com" <jasowang@...hat.com>,
"herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
"helei.sig11@...edance.com" <helei.sig11@...edance.com>,
"davem@...emloft.net" <davem@...emloft.net>
Subject: RE: [PATCH v5 1/5] virtio-crypto: change code style
> -----Original Message-----
> From: zhenwei pi [mailto:pizhenwei@...edance.com]
> Sent: Thursday, May 5, 2022 5:24 PM
> To: Gonglei (Arei) <arei.gonglei@...wei.com>; mst@...hat.com
> Cc: jasowang@...hat.com; herbert@...dor.apana.org.au;
> linux-kernel@...r.kernel.org; virtualization@...ts.linux-foundation.org;
> linux-crypto@...r.kernel.org; helei.sig11@...edance.com;
> pizhenwei@...edance.com; davem@...emloft.net
> Subject: [PATCH v5 1/5] virtio-crypto: change code style
>
> Use temporary variable to make code easy to read and maintain.
> /* Pad cipher's parameters */
> vcrypto->ctrl.u.sym_create_session.op_type =
> cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
> vcrypto->ctrl.header.algo;
> vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
> cpu_to_le32(keylen);
> vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
> cpu_to_le32(op);
> -->
> sym_create_session = &ctrl->u.sym_create_session;
> sym_create_session->op_type =
> cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> sym_create_session->u.cipher.para.algo = ctrl->header.algo;
> sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
> sym_create_session->u.cipher.para.op = cpu_to_le32(op);
>
> The new style shows more obviously:
> - the variable we want to operate.
> - an assignment statement in a single line.
>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Gonglei <arei.gonglei@...wei.com>
> Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
> ---
> .../virtio/virtio_crypto_akcipher_algs.c | 40 ++++++-----
> .../virtio/virtio_crypto_skcipher_algs.c | 72 +++++++++----------
> 2 files changed, 59 insertions(+), 53 deletions(-)
>
Reviewed-by: Gonglei <arei.gonglei@...wei.com>
Regards,
-Gonglei
> diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
> b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
> index f3ec9420215e..20901a263fc8 100644
> --- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
> +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
> @@ -106,23 +106,27 @@ static int
> virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
> unsigned int inlen;
> int err;
> unsigned int num_out = 0, num_in = 0;
> + struct virtio_crypto_op_ctrl_req *ctrl;
> + struct virtio_crypto_session_input *input;
>
> pkey = kmemdup(key, keylen, GFP_ATOMIC);
> if (!pkey)
> return -ENOMEM;
>
> spin_lock(&vcrypto->ctrl_lock);
> - memcpy(&vcrypto->ctrl.header, header, sizeof(vcrypto->ctrl.header));
> - memcpy(&vcrypto->ctrl.u, para, sizeof(vcrypto->ctrl.u));
> - vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
> + ctrl = &vcrypto->ctrl;
> + memcpy(&ctrl->header, header, sizeof(ctrl->header));
> + memcpy(&ctrl->u, para, sizeof(ctrl->u));
> + input = &vcrypto->input;
> + input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
>
> - sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> + sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
> sgs[num_out++] = &outhdr_sg;
>
> sg_init_one(&key_sg, pkey, keylen);
> sgs[num_out++] = &key_sg;
>
> - sg_init_one(&inhdr_sg, &vcrypto->input, sizeof(vcrypto->input));
> + sg_init_one(&inhdr_sg, input, sizeof(*input));
> sgs[num_out + num_in++] = &inhdr_sg;
>
> err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
> GFP_ATOMIC); @@ -134,12 +138,12 @@ static int
> virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
> !virtqueue_is_broken(vcrypto->ctrl_vq))
> cpu_relax();
>
> - if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
> + if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
> err = -EINVAL;
> goto out;
> }
>
> - ctx->session_id = le64_to_cpu(vcrypto->input.session_id);
> + ctx->session_id = le64_to_cpu(input->session_id);
> ctx->session_valid = true;
> err = 0;
>
> @@ -149,7 +153,7 @@ static int
> virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
>
> if (err < 0)
> pr_err("virtio_crypto: Create session failed status: %u\n",
> - le32_to_cpu(vcrypto->input.status));
> + le32_to_cpu(input->status));
>
> return err;
> }
> @@ -161,23 +165,27 @@ static int
> virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
> struct virtio_crypto *vcrypto = ctx->vcrypto;
> unsigned int num_out = 0, num_in = 0, inlen;
> int err;
> + struct virtio_crypto_op_ctrl_req *ctrl;
> + struct virtio_crypto_inhdr *ctrl_status;
>
> spin_lock(&vcrypto->ctrl_lock);
> if (!ctx->session_valid) {
> err = 0;
> goto out;
> }
> - vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
> - vcrypto->ctrl.header.opcode =
> cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
> - vcrypto->ctrl.header.queue_id = 0;
> + ctrl_status = &vcrypto->ctrl_status;
> + ctrl_status->status = VIRTIO_CRYPTO_ERR;
> + ctrl = &vcrypto->ctrl;
> + ctrl->header.opcode =
> cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
> + ctrl->header.queue_id = 0;
>
> - destroy_session = &vcrypto->ctrl.u.destroy_session;
> + destroy_session = &ctrl->u.destroy_session;
> destroy_session->session_id = cpu_to_le64(ctx->session_id);
>
> - sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> + sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
> sgs[num_out++] = &outhdr_sg;
>
> - sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status,
> sizeof(vcrypto->ctrl_status.status));
> + sg_init_one(&inhdr_sg, &ctrl_status->status,
> +sizeof(ctrl_status->status));
> sgs[num_out + num_in++] = &inhdr_sg;
>
> err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
> GFP_ATOMIC); @@ -189,7 +197,7 @@ static int
> virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
> !virtqueue_is_broken(vcrypto->ctrl_vq))
> cpu_relax();
>
> - if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
> + if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
> err = -EINVAL;
> goto out;
> }
> @@ -201,7 +209,7 @@ static int
> virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
> spin_unlock(&vcrypto->ctrl_lock);
> if (err < 0) {
> pr_err("virtio_crypto: Close session failed status: %u, session_id:
> 0x%llx\n",
> - vcrypto->ctrl_status.status, destroy_session->session_id);
> + ctrl_status->status, destroy_session->session_id);
> }
>
> return err;
> diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
> b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
> index a618c46a52b8..e3c5bc8d6112 100644
> --- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
> +++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
> @@ -123,6 +123,9 @@ static int virtio_crypto_alg_skcipher_init_session(
> int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT :
> VIRTIO_CRYPTO_OP_DECRYPT;
> int err;
> unsigned int num_out = 0, num_in = 0;
> + struct virtio_crypto_op_ctrl_req *ctrl;
> + struct virtio_crypto_session_input *input;
> + struct virtio_crypto_sym_create_session_req *sym_create_session;
>
> /*
> * Avoid to do DMA from the stack, switch to using @@ -135,24 +138,22
> @@ static int virtio_crypto_alg_skcipher_init_session(
>
> spin_lock(&vcrypto->ctrl_lock);
> /* Pad ctrl header */
> - vcrypto->ctrl.header.opcode =
> - cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
> - vcrypto->ctrl.header.algo = cpu_to_le32(alg);
> + ctrl = &vcrypto->ctrl;
> + ctrl->header.opcode =
> cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
> + ctrl->header.algo = cpu_to_le32(alg);
> /* Set the default dataqueue id to 0 */
> - vcrypto->ctrl.header.queue_id = 0;
> + ctrl->header.queue_id = 0;
>
> - vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
> + input = &vcrypto->input;
> + input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
> /* Pad cipher's parameters */
> - vcrypto->ctrl.u.sym_create_session.op_type =
> - cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> - vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
> - vcrypto->ctrl.header.algo;
> - vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
> - cpu_to_le32(keylen);
> - vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
> - cpu_to_le32(op);
> -
> - sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> + sym_create_session = &ctrl->u.sym_create_session;
> + sym_create_session->op_type =
> cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> + sym_create_session->u.cipher.para.algo = ctrl->header.algo;
> + sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
> + sym_create_session->u.cipher.para.op = cpu_to_le32(op);
> +
> + sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
> sgs[num_out++] = &outhdr;
>
> /* Set key */
> @@ -160,7 +161,7 @@ static int virtio_crypto_alg_skcipher_init_session(
> sgs[num_out++] = &key_sg;
>
> /* Return status and session id back */
> - sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
> + sg_init_one(&inhdr, input, sizeof(*input));
> sgs[num_out + num_in++] = &inhdr;
>
> err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, @@ -180,20
> +181,18 @@ static int virtio_crypto_alg_skcipher_init_session(
> !virtqueue_is_broken(vcrypto->ctrl_vq))
> cpu_relax();
>
> - if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
> + if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
> spin_unlock(&vcrypto->ctrl_lock);
> pr_err("virtio_crypto: Create session failed status: %u\n",
> - le32_to_cpu(vcrypto->input.status));
> + le32_to_cpu(input->status));
> kfree_sensitive(cipher_key);
> return -EINVAL;
> }
>
> if (encrypt)
> - ctx->enc_sess_info.session_id =
> - le64_to_cpu(vcrypto->input.session_id);
> + ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
> else
> - ctx->dec_sess_info.session_id =
> - le64_to_cpu(vcrypto->input.session_id);
> + ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
>
> spin_unlock(&vcrypto->ctrl_lock);
>
> @@ -211,30 +210,30 @@ static int virtio_crypto_alg_skcipher_close_session(
> struct virtio_crypto *vcrypto = ctx->vcrypto;
> int err;
> unsigned int num_out = 0, num_in = 0;
> + struct virtio_crypto_op_ctrl_req *ctrl;
> + struct virtio_crypto_inhdr *ctrl_status;
>
> spin_lock(&vcrypto->ctrl_lock);
> - vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
> + ctrl_status = &vcrypto->ctrl_status;
> + ctrl_status->status = VIRTIO_CRYPTO_ERR;
> /* Pad ctrl header */
> - vcrypto->ctrl.header.opcode =
> - cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
> + ctrl = &vcrypto->ctrl;
> + ctrl->header.opcode =
> +cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
> /* Set the default virtqueue id to 0 */
> - vcrypto->ctrl.header.queue_id = 0;
> + ctrl->header.queue_id = 0;
>
> - destroy_session = &vcrypto->ctrl.u.destroy_session;
> + destroy_session = &ctrl->u.destroy_session;
>
> if (encrypt)
> - destroy_session->session_id =
> - cpu_to_le64(ctx->enc_sess_info.session_id);
> + destroy_session->session_id =
> +cpu_to_le64(ctx->enc_sess_info.session_id);
> else
> - destroy_session->session_id =
> - cpu_to_le64(ctx->dec_sess_info.session_id);
> + destroy_session->session_id =
> +cpu_to_le64(ctx->dec_sess_info.session_id);
>
> - sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> + sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
> sgs[num_out++] = &outhdr;
>
> /* Return status and session id back */
> - sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
> - sizeof(vcrypto->ctrl_status.status));
> + sg_init_one(&status_sg, &ctrl_status->status,
> +sizeof(ctrl_status->status));
> sgs[num_out + num_in++] = &status_sg;
>
> err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, @@ -249,11
> +248,10 @@ static int virtio_crypto_alg_skcipher_close_session(
> !virtqueue_is_broken(vcrypto->ctrl_vq))
> cpu_relax();
>
> - if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
> + if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
> spin_unlock(&vcrypto->ctrl_lock);
> pr_err("virtio_crypto: Close session failed status: %u, session_id:
> 0x%llx\n",
> - vcrypto->ctrl_status.status,
> - destroy_session->session_id);
> + ctrl_status->status, destroy_session->session_id);
>
> return -EINVAL;
> }
> --
> 2.20.1
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