Re: [PATCH v2 5/5] crypto: hisilicon/sec2 - Add pbuffer mode for SEC driver

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Hi,
On 2020/3/2 20:49, Jonathan Cameron wrote:
On Mon, 2 Mar 2020 14:15:16 +0800
Zaibo Xu <xuzaibo@xxxxxxxxxx> wrote:

From: liulongfang <liulongfang@xxxxxxxxxx>

In the scenario of SMMU translation, the SEC performance of short messages
(<512Bytes) cannot meet our expectations. To avoid this, we reserve the
plat buffer (PBUF) memory for small packets when creating TFM.

Signed-off-by: liulongfang <liulongfang@xxxxxxxxxx>
Signed-off-by: Zaibo Xu <xuzaibo@xxxxxxxxxx>
Hmm. I guess we pay the price for this performance trick in memory usage.
Oh well, if it becomes a problem we can always look at more clever solutions.

Looks good to me.  Fix up liulongfang's sign off..

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Okay. And we have done the performance test with DMA pool, which show worse performance.
About -5.5% income at 512 bytes packets with 16 kthreads.

---
  drivers/crypto/hisilicon/sec2/sec.h        |   4 +
  drivers/crypto/hisilicon/sec2/sec_crypto.c | 173 ++++++++++++++++++++++++++++-
  2 files changed, 172 insertions(+), 5 deletions(-)

diff --git a/drivers/crypto/hisilicon/sec2/sec.h b/drivers/crypto/hisilicon/sec2/sec.h
index e67b416..a73d82c 100644
--- a/drivers/crypto/hisilicon/sec2/sec.h
+++ b/drivers/crypto/hisilicon/sec2/sec.h
@@ -11,6 +11,8 @@
/* Algorithm resource per hardware SEC queue */
  struct sec_alg_res {
+	u8 *pbuf;
+	dma_addr_t pbuf_dma;
  	u8 *c_ivin;
  	dma_addr_t c_ivin_dma;
  	u8 *out_mac;
@@ -50,6 +52,7 @@ struct sec_req {
/* Status of the SEC request */
  	bool fake_busy;
+	bool use_pbuf;
  };
/**
@@ -130,6 +133,7 @@ struct sec_ctx {
  	atomic_t dec_qcyclic;
enum sec_alg_type alg_type;
+	bool pbuf_supported;
  	struct sec_cipher_ctx c_ctx;
  	struct sec_auth_ctx a_ctx;
  };
diff --git a/drivers/crypto/hisilicon/sec2/sec_crypto.c b/drivers/crypto/hisilicon/sec2/sec_crypto.c
index 1eeaa74..3136ada 100644
--- a/drivers/crypto/hisilicon/sec2/sec_crypto.c
+++ b/drivers/crypto/hisilicon/sec2/sec_crypto.c
@@ -48,6 +48,19 @@
  #define SEC_MAX_MAC_LEN		64
  #define SEC_MAX_AAD_LEN		65535
  #define SEC_TOTAL_MAC_SZ	(SEC_MAX_MAC_LEN * QM_Q_DEPTH)
+
+#define SEC_PBUF_SZ			512
+#define SEC_PBUF_IV_OFFSET		SEC_PBUF_SZ
+#define SEC_PBUF_MAC_OFFSET		(SEC_PBUF_SZ + SEC_IV_SIZE)
+#define SEC_PBUF_PKG		(SEC_PBUF_SZ + SEC_IV_SIZE +	\
+			SEC_MAX_MAC_LEN * 2)
+#define SEC_PBUF_NUM		(PAGE_SIZE / SEC_PBUF_PKG)
+#define SEC_PBUF_PAGE_NUM	(QM_Q_DEPTH / SEC_PBUF_NUM)
+#define SEC_PBUF_LEFT_SZ	(SEC_PBUF_PKG * (QM_Q_DEPTH -	\
+			SEC_PBUF_PAGE_NUM * SEC_PBUF_NUM))
+#define SEC_TOTAL_PBUF_SZ	(PAGE_SIZE * SEC_PBUF_PAGE_NUM +	\
+			SEC_PBUF_LEFT_SZ)
+
  #define SEC_SQE_LEN_RATE	4
  #define SEC_SQE_CFLAG		2
  #define SEC_SQE_AEAD_FLAG	3
@@ -246,6 +259,50 @@ static void sec_free_mac_resource(struct device *dev, struct sec_alg_res *res)
  				  res->out_mac, res->out_mac_dma);
  }
+static void sec_free_pbuf_resource(struct device *dev, struct sec_alg_res *res)
+{
+	if (res->pbuf)
+		dma_free_coherent(dev, SEC_TOTAL_PBUF_SZ,
+				  res->pbuf, res->pbuf_dma);
+}
+
+/*
+ * To improve performance, pbuffer is used for
+ * small packets (< 512Bytes) as IOMMU translation using.
+ */
+static int sec_alloc_pbuf_resource(struct device *dev, struct sec_alg_res *res)
+{
+	int pbuf_page_offset;
+	int i, j, k;
+
+	res->pbuf = dma_alloc_coherent(dev, SEC_TOTAL_PBUF_SZ,
+				&res->pbuf_dma, GFP_KERNEL);
+	if (!res->pbuf)
+		return -ENOMEM;
+
+	/*
+	 * SEC_PBUF_PKG contains data pbuf, iv and
+	 * out_mac : <SEC_PBUF|SEC_IV|SEC_MAC>
+	 * Every PAGE contains six SEC_PBUF_PKG
+	 * The sec_qp_ctx contains QM_Q_DEPTH numbers of SEC_PBUF_PKG
+	 * So we need SEC_PBUF_PAGE_NUM numbers of PAGE
+	 * for the SEC_TOTAL_PBUF_SZ
+	 */
+	for (i = 0; i <= SEC_PBUF_PAGE_NUM; i++) {
+		pbuf_page_offset = PAGE_SIZE * i;
+		for (j = 0; j < SEC_PBUF_NUM; j++) {
+			k = i * SEC_PBUF_NUM + j;
+			if (k == QM_Q_DEPTH)
+				break;
+			res[k].pbuf = res->pbuf +
+				j * SEC_PBUF_PKG + pbuf_page_offset;
+			res[k].pbuf_dma = res->pbuf_dma +
+				j * SEC_PBUF_PKG + pbuf_page_offset;
+		}
+	}
+	return 0;
+}
+
  static int sec_alg_resource_alloc(struct sec_ctx *ctx,
  				  struct sec_qp_ctx *qp_ctx)
  {
@@ -262,6 +319,13 @@ static int sec_alg_resource_alloc(struct sec_ctx *ctx,
  		if (ret)
  			goto alloc_fail;
  	}
+	if (ctx->pbuf_supported) {
+		ret = sec_alloc_pbuf_resource(dev, res);
+		if (ret) {
+			dev_err(dev, "fail to alloc pbuf dma resource!\n");
+			goto alloc_fail;
+		}
+	}
return 0;
  alloc_fail:
@@ -279,6 +343,8 @@ static void sec_alg_resource_free(struct sec_ctx *ctx,
if (ctx->alg_type == SEC_AEAD)
  		sec_free_mac_resource(dev, qp_ctx->res);
+	if (ctx->pbuf_supported)
+		sec_free_pbuf_resource(dev, qp_ctx->res);
Is the ordering right here?  Seems like this is allocated after the mac_resource
so should be freed before it.

I would prefer specific gotos for resource_alloc failure cases to make it clear
that different cleanup is needed if we fail allocating this from doing the
mac_resource allocation.
Yes, agree. 'sec_alg_resource_alloc' also has a problem.

Cheers,
Zaibo

.

  }
static int sec_create_qp_ctx(struct hisi_qm *qm, struct sec_ctx *ctx,
@@ -369,6 +435,8 @@ static int sec_ctx_base_init(struct sec_ctx *ctx)
  	ctx->sec = sec;
  	ctx->hlf_q_num = sec->ctx_q_num >> 1;
+ ctx->pbuf_supported = ctx->sec->iommu_used;
+
  	/* Half of queue depth is taken as fake requests limit in the queue. */
  	ctx->fake_req_limit = QM_Q_DEPTH >> 1;
  	ctx->qp_ctx = kcalloc(sec->ctx_q_num, sizeof(struct sec_qp_ctx),
@@ -591,6 +659,66 @@ GEN_SEC_SETKEY_FUNC(3des_cbc, SEC_CALG_3DES, SEC_CMODE_CBC)
  GEN_SEC_SETKEY_FUNC(sm4_xts, SEC_CALG_SM4, SEC_CMODE_XTS)
  GEN_SEC_SETKEY_FUNC(sm4_cbc, SEC_CALG_SM4, SEC_CMODE_CBC)
+static int sec_cipher_pbuf_map(struct sec_ctx *ctx, struct sec_req *req,
+			struct scatterlist *src)
+{
+	struct aead_request *aead_req = req->aead_req.aead_req;
+	struct sec_cipher_req *c_req = &req->c_req;
+	struct sec_qp_ctx *qp_ctx = req->qp_ctx;
+	struct device *dev = SEC_CTX_DEV(ctx);
+	int copy_size, pbuf_length;
+	int req_id = req->req_id;
+
+	if (ctx->alg_type == SEC_AEAD)
+		copy_size = aead_req->cryptlen + aead_req->assoclen;
+	else
+		copy_size = c_req->c_len;
+
+	pbuf_length = sg_copy_to_buffer(src, sg_nents(src),
+				qp_ctx->res[req_id].pbuf,
+				copy_size);
+
+	if (unlikely(pbuf_length != copy_size)) {
+		dev_err(dev, "copy src data to pbuf error!\n");
+		return -EINVAL;
+	}
+
+	c_req->c_in_dma = qp_ctx->res[req_id].pbuf_dma;
+
+	if (!c_req->c_in_dma) {
+		dev_err(dev, "fail to set pbuffer address!\n");
+		return -ENOMEM;
+	}
+
+	c_req->c_out_dma = c_req->c_in_dma;
+
+	return 0;
+}
+
+static void sec_cipher_pbuf_unmap(struct sec_ctx *ctx, struct sec_req *req,
+			struct scatterlist *dst)
+{
+	struct aead_request *aead_req = req->aead_req.aead_req;
+	struct sec_cipher_req *c_req = &req->c_req;
+	struct sec_qp_ctx *qp_ctx = req->qp_ctx;
+	struct device *dev = SEC_CTX_DEV(ctx);
+	int copy_size, pbuf_length;
+	int req_id = req->req_id;
+
+	if (ctx->alg_type == SEC_AEAD)
+		copy_size = c_req->c_len + aead_req->assoclen;
+	else
+		copy_size = c_req->c_len;
+
+	pbuf_length = sg_copy_from_buffer(dst, sg_nents(dst),
+				qp_ctx->res[req_id].pbuf,
+				copy_size);
+
+	if (unlikely(pbuf_length != copy_size))
+		dev_err(dev, "copy pbuf data to dst error!\n");
+
+}
+
  static int sec_cipher_map(struct sec_ctx *ctx, struct sec_req *req,
  			  struct scatterlist *src, struct scatterlist *dst)
  {
@@ -599,7 +727,20 @@ static int sec_cipher_map(struct sec_ctx *ctx, struct sec_req *req,
  	struct sec_qp_ctx *qp_ctx = req->qp_ctx;
  	struct sec_alg_res *res = &qp_ctx->res[req->req_id];
  	struct device *dev = SEC_CTX_DEV(ctx);
+	int ret;
+
+	if (req->use_pbuf) {
+		ret = sec_cipher_pbuf_map(ctx, req, src);
+		c_req->c_ivin = res->pbuf + SEC_PBUF_IV_OFFSET;
+		c_req->c_ivin_dma = res->pbuf_dma + SEC_PBUF_IV_OFFSET;
+		if (ctx->alg_type == SEC_AEAD) {
+			a_req->out_mac = res->pbuf + SEC_PBUF_MAC_OFFSET;
+			a_req->out_mac_dma = res->pbuf_dma +
+					SEC_PBUF_MAC_OFFSET;
+		}
+ return ret;
+	}
  	c_req->c_ivin = res->c_ivin;
  	c_req->c_ivin_dma = res->c_ivin_dma;
  	if (ctx->alg_type == SEC_AEAD) {
@@ -642,10 +783,14 @@ static void sec_cipher_unmap(struct sec_ctx *ctx, struct sec_req *req,
  	struct sec_cipher_req *c_req = &req->c_req;
  	struct device *dev = SEC_CTX_DEV(ctx);
- if (dst != src)
-		hisi_acc_sg_buf_unmap(dev, src, c_req->c_in);
+	if (req->use_pbuf) {
+		sec_cipher_pbuf_unmap(ctx, req, dst);
+	} else {
+		if (dst != src)
+			hisi_acc_sg_buf_unmap(dev, src, c_req->c_in);
- hisi_acc_sg_buf_unmap(dev, dst, c_req->c_out);
+		hisi_acc_sg_buf_unmap(dev, dst, c_req->c_out);
+	}
  }
static int sec_skcipher_sgl_map(struct sec_ctx *ctx, struct sec_req *req)
@@ -844,7 +989,10 @@ static int sec_skcipher_bd_fill(struct sec_ctx *ctx, struct sec_req *req)
  		cipher = SEC_CIPHER_DEC << SEC_CIPHER_OFFSET;
  	sec_sqe->type_cipher_auth = bd_type | cipher;
- sa_type = SEC_SGL << SEC_SRC_SGL_OFFSET;
+	if (req->use_pbuf)
+		sa_type = SEC_PBUF << SEC_SRC_SGL_OFFSET;
+	else
+		sa_type = SEC_SGL << SEC_SRC_SGL_OFFSET;
  	scene = SEC_COMM_SCENE << SEC_SCENE_OFFSET;
  	if (c_req->c_in_dma != c_req->c_out_dma)
  		de = 0x1 << SEC_DE_OFFSET;
@@ -852,7 +1000,10 @@ static int sec_skcipher_bd_fill(struct sec_ctx *ctx, struct sec_req *req)
  	sec_sqe->sds_sa_type = (de | scene | sa_type);
/* Just set DST address type */
-	da_type = SEC_SGL << SEC_DST_SGL_OFFSET;
+	if (req->use_pbuf)
+		da_type = SEC_PBUF << SEC_DST_SGL_OFFSET;
+	else
+		da_type = SEC_SGL << SEC_DST_SGL_OFFSET;
  	sec_sqe->sdm_addr_type |= da_type;
sec_sqe->type2.clen_ivhlen |= cpu_to_le32(c_req->c_len);
@@ -1215,6 +1366,12 @@ static int sec_skcipher_param_check(struct sec_ctx *ctx, struct sec_req *sreq)
  		return -EINVAL;
  	}
  	sreq->c_req.c_len = sk_req->cryptlen;
+
+	if (ctx->pbuf_supported && sk_req->cryptlen <= SEC_PBUF_SZ)
+		sreq->use_pbuf = true;
+	else
+		sreq->use_pbuf = false;
+
  	if (c_alg == SEC_CALG_3DES) {
  		if (unlikely(sk_req->cryptlen & (DES3_EDE_BLOCK_SIZE - 1))) {
  			dev_err(dev, "skcipher 3des input length error!\n");
@@ -1334,6 +1491,12 @@ static int sec_aead_param_check(struct sec_ctx *ctx, struct sec_req *sreq)
  		return -EINVAL;
  	}
+ if (ctx->pbuf_supported && (req->cryptlen + req->assoclen) <=
+		SEC_PBUF_SZ)
+		sreq->use_pbuf = true;
+	else
+		sreq->use_pbuf = false;
+
  	/* Support AES only */
  	if (unlikely(c_alg != SEC_CALG_AES)) {
  		dev_err(SEC_CTX_DEV(ctx), "aead crypto alg error!\n");

.






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