[PATCH v13 03/22] crypto: iaa - Simplify, consistency of function parameters, minor stats bug fix.

[Kanchana P Sridhar <kanchana.p.sridhar@intel.com>]

This patch further simplifies the code in some places and makes it more
consistent and readable:

1) Change iaa_compress_verify() @dlen parameter to be a value instead of
   a pointer, because @dlen's value is only read, not modified by this
   procedure.

2) Simplify the success/error return paths in iaa_compress(),
   iaa_decompress() and iaa_compress_verify().

3) Delete dev_dbg() statements to make the code more readable.

4) Change return value from descriptor allocation failures to be
   -ENODEV, for better maintainability.

5) Fix a minor statistics bug in iaa_decompress(), with the
   decomp_bytes getting updated in case of errors.

Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
---
 drivers/crypto/intel/iaa/iaa_crypto_main.c | 107 +++++----------------
 1 file changed, 22 insertions(+), 85 deletions(-)

diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c b/drivers/crypto/intel/iaa/iaa_crypto_main.c
index 9de7a8a4d7a8..44d4e2494bf3 100644
--- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
+++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
@@ -1596,7 +1596,7 @@ static int iaa_remap_for_verify(struct device *dev, struct iaa_wq *iaa_wq,
 static int iaa_compress_verify(struct crypto_tfm *tfm, struct acomp_req *req,
 			       struct idxd_wq *wq,
 			       dma_addr_t src_addr, unsigned int slen,
-			       dma_addr_t dst_addr, unsigned int *dlen)
+			       dma_addr_t dst_addr, unsigned int dlen)
 {
 	struct iaa_device_compression_mode *active_compression_mode;
 	struct iaa_compression_ctx *ctx = crypto_tfm_ctx(tfm);
@@ -1620,10 +1620,8 @@ static int iaa_compress_verify(struct crypto_tfm *tfm, struct acomp_req *req,
 
 	idxd_desc = idxd_alloc_desc(wq, IDXD_OP_BLOCK);
 	if (IS_ERR(idxd_desc)) {
-		dev_dbg(dev, "idxd descriptor allocation failed\n");
-		dev_dbg(dev, "iaa compress failed: ret=%ld\n",
-			PTR_ERR(idxd_desc));
-		return PTR_ERR(idxd_desc);
+		dev_dbg(dev, "iaa compress_verify failed: idxd descriptor allocation failure: ret=%ld\n", PTR_ERR(idxd_desc));
+		return -ENODEV;
 	}
 	desc = idxd_desc->iax_hw;
 
@@ -1635,19 +1633,11 @@ static int iaa_compress_verify(struct crypto_tfm *tfm, struct acomp_req *req,
 	desc->priv = 0;
 
 	desc->src1_addr = (u64)dst_addr;
-	desc->src1_size = *dlen;
+	desc->src1_size = dlen;
 	desc->dst_addr = (u64)src_addr;
 	desc->max_dst_size = slen;
 	desc->completion_addr = idxd_desc->compl_dma;
 
-	dev_dbg(dev, "(verify) compression mode %s,"
-		" desc->src1_addr %llx, desc->src1_size %d,"
-		" desc->dst_addr %llx, desc->max_dst_size %d,"
-		" desc->src2_addr %llx, desc->src2_size %d\n",
-		active_compression_mode->name,
-		desc->src1_addr, desc->src1_size, desc->dst_addr,
-		desc->max_dst_size, desc->src2_addr, desc->src2_size);
-
 	ret = idxd_submit_desc(wq, idxd_desc);
 	if (ret) {
 		dev_dbg(dev, "submit_desc (verify) failed ret=%d\n", ret);
@@ -1670,14 +1660,10 @@ static int iaa_compress_verify(struct crypto_tfm *tfm, struct acomp_req *req,
 		goto err;
 	}
 
-	idxd_free_desc(wq, idxd_desc);
-out:
-	return ret;
 err:
 	idxd_free_desc(wq, idxd_desc);
-	dev_dbg(dev, "iaa compress failed: ret=%d\n", ret);
 
-	goto out;
+	return ret;
 }
 
 static void iaa_desc_complete(struct idxd_desc *idxd_desc,
@@ -1757,7 +1743,7 @@ static void iaa_desc_complete(struct idxd_desc *idxd_desc,
 		}
 
 		ret = iaa_compress_verify(ctx->tfm, ctx->req, iaa_wq->wq, src_addr,
-					  ctx->req->slen, dst_addr, &ctx->req->dlen);
+					  ctx->req->slen, dst_addr, ctx->req->dlen);
 		if (ret) {
 			dev_dbg(dev, "%s: compress verify failed ret=%d\n", __func__, ret);
 			err = -EIO;
@@ -1783,7 +1769,7 @@ static void iaa_desc_complete(struct idxd_desc *idxd_desc,
 	iaa_wq_put(idxd_desc->wq);
 }
 
-static int iaa_compress(struct crypto_tfm *tfm,	struct acomp_req *req,
+static int iaa_compress(struct crypto_tfm *tfm, struct acomp_req *req,
 			struct idxd_wq *wq,
 			dma_addr_t src_addr, unsigned int slen,
 			dma_addr_t dst_addr, unsigned int *dlen)
@@ -1810,9 +1796,9 @@ static int iaa_compress(struct crypto_tfm *tfm,	struct acomp_req *req,
 
 	idxd_desc = idxd_alloc_desc(wq, IDXD_OP_BLOCK);
 	if (IS_ERR(idxd_desc)) {
-		dev_dbg(dev, "idxd descriptor allocation failed\n");
-		dev_dbg(dev, "iaa compress failed: ret=%ld\n", PTR_ERR(idxd_desc));
-		return PTR_ERR(idxd_desc);
+		dev_dbg(dev, "iaa compress failed: idxd descriptor allocation failure: ret=%ld\n",
+			PTR_ERR(idxd_desc));
+		return -ENODEV;
 	}
 	desc = idxd_desc->iax_hw;
 
@@ -1838,21 +1824,8 @@ static int iaa_compress(struct crypto_tfm *tfm,	struct acomp_req *req,
 		idxd_desc->crypto.src_addr = src_addr;
 		idxd_desc->crypto.dst_addr = dst_addr;
 		idxd_desc->crypto.compress = true;
-
-		dev_dbg(dev, "%s use_async_irq: compression mode %s,"
-			" src_addr %llx, dst_addr %llx\n", __func__,
-			active_compression_mode->name,
-			src_addr, dst_addr);
 	}
 
-	dev_dbg(dev, "%s: compression mode %s,"
-		" desc->src1_addr %llx, desc->src1_size %d,"
-		" desc->dst_addr %llx, desc->max_dst_size %d,"
-		" desc->src2_addr %llx, desc->src2_size %d\n", __func__,
-		active_compression_mode->name,
-		desc->src1_addr, desc->src1_size, desc->dst_addr,
-		desc->max_dst_size, desc->src2_addr, desc->src2_size);
-
 	ret = idxd_submit_desc(wq, idxd_desc);
 	if (ret) {
 		dev_dbg(dev, "submit_desc failed ret=%d\n", ret);
@@ -1865,7 +1838,6 @@ static int iaa_compress(struct crypto_tfm *tfm,	struct acomp_req *req,
 
 	if (ctx->async_mode) {
 		ret = -EINPROGRESS;
-		dev_dbg(dev, "%s: returning -EINPROGRESS\n", __func__);
 		goto out;
 	}
 
@@ -1883,15 +1855,10 @@ static int iaa_compress(struct crypto_tfm *tfm,	struct acomp_req *req,
 
 	*compression_crc = idxd_desc->iax_completion->crc;
 
-	if (!ctx->async_mode)
-		idxd_free_desc(wq, idxd_desc);
-out:
-	return ret;
 err:
 	idxd_free_desc(wq, idxd_desc);
-	dev_dbg(dev, "iaa compress failed: ret=%d\n", ret);
-
-	goto out;
+out:
+	return ret;
 }
 
 static int iaa_decompress(struct crypto_tfm *tfm, struct acomp_req *req,
@@ -1920,10 +1887,10 @@ static int iaa_decompress(struct crypto_tfm *tfm, struct acomp_req *req,
 
 	idxd_desc = idxd_alloc_desc(wq, IDXD_OP_BLOCK);
 	if (IS_ERR(idxd_desc)) {
-		dev_dbg(dev, "idxd descriptor allocation failed\n");
-		dev_dbg(dev, "iaa decompress failed: ret=%ld\n",
+		ret = -ENODEV;
+		dev_dbg(dev, "%s: idxd descriptor allocation failed: ret=%ld\n", __func__,
 			PTR_ERR(idxd_desc));
-		return PTR_ERR(idxd_desc);
+		return ret;
 	}
 	desc = idxd_desc->iax_hw;
 
@@ -1947,21 +1914,8 @@ static int iaa_decompress(struct crypto_tfm *tfm, struct acomp_req *req,
 		idxd_desc->crypto.src_addr = src_addr;
 		idxd_desc->crypto.dst_addr = dst_addr;
 		idxd_desc->crypto.compress = false;
-
-		dev_dbg(dev, "%s: use_async_irq compression mode %s,"
-			" src_addr %llx, dst_addr %llx\n", __func__,
-			active_compression_mode->name,
-			src_addr, dst_addr);
 	}
 
-	dev_dbg(dev, "%s: decompression mode %s,"
-		" desc->src1_addr %llx, desc->src1_size %d,"
-		" desc->dst_addr %llx, desc->max_dst_size %d,"
-		" desc->src2_addr %llx, desc->src2_size %d\n", __func__,
-		active_compression_mode->name,
-		desc->src1_addr, desc->src1_size, desc->dst_addr,
-		desc->max_dst_size, desc->src2_addr, desc->src2_size);
-
 	ret = idxd_submit_desc(wq, idxd_desc);
 	if (ret) {
 		dev_dbg(dev, "submit_desc failed ret=%d\n", ret);
@@ -1974,7 +1928,6 @@ static int iaa_decompress(struct crypto_tfm *tfm, struct acomp_req *req,
 
 	if (ctx->async_mode) {
 		ret = -EINPROGRESS;
-		dev_dbg(dev, "%s: returning -EINPROGRESS\n", __func__);
 		goto out;
 	}
 
@@ -1996,23 +1949,19 @@ static int iaa_decompress(struct crypto_tfm *tfm, struct acomp_req *req,
 		}
 	} else {
 		req->dlen = idxd_desc->iax_completion->output_size;
+
+		/* Update stats */
+		update_total_decomp_bytes_in(slen);
+		update_wq_decomp_bytes(wq, slen);
 	}
 
 	*dlen = req->dlen;
 
-	if (!ctx->async_mode)
+err:
+	if (idxd_desc)
 		idxd_free_desc(wq, idxd_desc);
-
-	/* Update stats */
-	update_total_decomp_bytes_in(slen);
-	update_wq_decomp_bytes(wq, slen);
 out:
 	return ret;
-err:
-	idxd_free_desc(wq, idxd_desc);
-	dev_dbg(dev, "iaa decompress failed: ret=%d\n", ret);
-
-	goto out;
 }
 
 static int iaa_comp_acompress(struct acomp_req *req)
@@ -2059,9 +2008,6 @@ static int iaa_comp_acompress(struct acomp_req *req)
 		goto out;
 	}
 	src_addr = sg_dma_address(req->src);
-	dev_dbg(dev, "dma_map_sg, src_addr %llx, nr_sgs %d, req->src %p,"
-		" req->slen %d, sg_dma_len(sg) %d\n", src_addr, nr_sgs,
-		req->src, req->slen, sg_dma_len(req->src));
 
 	nr_sgs = dma_map_sg(dev, req->dst, sg_nents(req->dst), DMA_FROM_DEVICE);
 	if (nr_sgs <= 0 || nr_sgs > 1) {
@@ -2072,9 +2018,6 @@ static int iaa_comp_acompress(struct acomp_req *req)
 		goto err_map_dst;
 	}
 	dst_addr = sg_dma_address(req->dst);
-	dev_dbg(dev, "dma_map_sg, dst_addr %llx, nr_sgs %d, req->dst %p,"
-		" req->dlen %d, sg_dma_len(sg) %d\n", dst_addr, nr_sgs,
-		req->dst, req->dlen, sg_dma_len(req->dst));
 
 	ret = iaa_compress(tfm, req, wq, src_addr, req->slen, dst_addr,
 			   &req->dlen);
@@ -2089,7 +2032,7 @@ static int iaa_comp_acompress(struct acomp_req *req)
 		}
 
 		ret = iaa_compress_verify(tfm, req, wq, src_addr, req->slen,
-					  dst_addr, &req->dlen);
+					  dst_addr, req->dlen);
 		if (ret)
 			dev_dbg(dev, "asynchronous compress verification failed ret=%d\n", ret);
 
@@ -2152,9 +2095,6 @@ static int iaa_comp_adecompress(struct acomp_req *req)
 		goto out;
 	}
 	src_addr = sg_dma_address(req->src);
-	dev_dbg(dev, "dma_map_sg, src_addr %llx, nr_sgs %d, req->src %p,"
-		" req->slen %d, sg_dma_len(sg) %d\n", src_addr, nr_sgs,
-		req->src, req->slen, sg_dma_len(req->src));
 
 	nr_sgs = dma_map_sg(dev, req->dst, sg_nents(req->dst), DMA_FROM_DEVICE);
 	if (nr_sgs <= 0 || nr_sgs > 1) {
@@ -2165,9 +2105,6 @@ static int iaa_comp_adecompress(struct acomp_req *req)
 		goto err_map_dst;
 	}
 	dst_addr = sg_dma_address(req->dst);
-	dev_dbg(dev, "dma_map_sg, dst_addr %llx, nr_sgs %d, req->dst %p,"
-		" req->dlen %d, sg_dma_len(sg) %d\n", dst_addr, nr_sgs,
-		req->dst, req->dlen, sg_dma_len(req->dst));
 
 	ret = iaa_decompress(tfm, req, wq, src_addr, req->slen,
 			     dst_addr, &req->dlen);
-- 
2.27.0