linux-kernel - [PATCH 4/4 v2] crypto: octeontx2: Fix address alignment on CN10KB and CN10KA-B0

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Message-ID: <20250520130737.4181994-5-bbhushan2@marvell.com>
Date: Tue, 20 May 2025 18:37:37 +0530
From: Bharat Bhushan <bbhushan2@...vell.com>
To: <bbrezillon@...nel.org>, <schalla@...vell.com>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <giovanni.cabiddu@...el.com>, <linux@...blig.org>,
        <bharatb.linux@...il.com>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Bharat Bhushan <bbhushan2@...vell.com>, <stable@...r.kernel.org>
Subject: [PATCH 4/4 v2] crypto: octeontx2: Fix address alignment on CN10KB and CN10KA-B0

octeontx2 crypto driver allocates memory using kmalloc/kzalloc,
and uses this memory for dma (does dma_map_single()). It assumes
that kmalloc/kzalloc will return 128-byte aligned address. But
kmalloc/kzalloc returns 8-byte aligned address after below changes:
  "9382bc44b5f5 arm64: allow kmalloc() caches aligned to the
   smaller cache_line_size()

Memory allocated are used for following purpose:
 - Input data or scatter list address - 8-Byte alignment
 - Output data or gather list address - 8-Byte alignment
 - Completion address - 32-Byte alignment.

This patch ensures all addresses are aligned as mentioned above.

Signed-off-by: Bharat Bhushan <bbhushan2@...vell.com>
Cc: <stable@...r.kernel.org> #v6.8+
---
v1->v2:
 - Fixed memory padding size calculation as per review comment 

 .../marvell/octeontx2/otx2_cpt_reqmgr.h       | 59 ++++++++++++++-----
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/drivers/crypto/marvell/octeontx2/otx2_cpt_reqmgr.h b/drivers/crypto/marvell/octeontx2/otx2_cpt_reqmgr.h
index bb4e067ae826..766fa63fb075 100644
--- a/drivers/crypto/marvell/octeontx2/otx2_cpt_reqmgr.h
+++ b/drivers/crypto/marvell/octeontx2/otx2_cpt_reqmgr.h
@@ -350,22 +350,47 @@ static inline struct otx2_cpt_inst_info *
 cn10k_sgv2_info_create(struct pci_dev *pdev, struct otx2_cpt_req_info *req,
 		       gfp_t gfp)
 {
-	u32 dlen = 0, g_len, sg_len, info_len;
-	int align = OTX2_CPT_DMA_MINALIGN;
+	u32 dlen = 0, g_len, s_len, sg_len, info_len;
 	struct otx2_cpt_inst_info *info;
-	u16 g_sz_bytes, s_sz_bytes;
 	u32 total_mem_len;
 	int i;
 
-	g_sz_bytes = ((req->in_cnt + 2) / 3) *
-		      sizeof(struct cn10kb_cpt_sglist_component);
-	s_sz_bytes = ((req->out_cnt + 2) / 3) *
-		      sizeof(struct cn10kb_cpt_sglist_component);
+	/* Allocate memory to meet below alignment requirement:
+	 *  ----------------------------------
+	 * |    struct otx2_cpt_inst_info     |
+	 * |    (No alignment required)       |
+	 * |     -----------------------------|
+	 * |    | padding for 8B alignment    |
+	 * |----------------------------------|
+	 * |    SG List Gather/Input memory   |
+	 * |    Length = multiple of 32Bytes  |
+	 * |    Alignment = 8Byte             |
+	 * |----------------------------------|
+	 * |    SG List Scatter/Output memory |
+	 * |    Length = multiple of 32Bytes  |
+	 * |    Alignment = 8Byte             |
+	 * |    (padding for below alignment) |
+	 * |     -----------------------------|
+	 * |    | padding for 32B alignment   |
+	 * |----------------------------------|
+	 * |    Result response memory        |
+	 *  ----------------------------------
+	 */
 
-	g_len = ALIGN(g_sz_bytes, align);
-	sg_len = ALIGN(g_len + s_sz_bytes, align);
-	info_len = ALIGN(sizeof(*info), align);
-	total_mem_len = sg_len + info_len + sizeof(union otx2_cpt_res_s);
+	info_len = sizeof(*info);
+
+	g_len = ((req->in_cnt + 2) / 3) *
+		 sizeof(struct cn10kb_cpt_sglist_component);
+	s_len = ((req->out_cnt + 2) / 3) *
+		 sizeof(struct cn10kb_cpt_sglist_component);
+	sg_len = g_len + s_len;
+
+	/* Allocate extra memory for SG and response address alignment */
+	total_mem_len = ALIGN(info_len, OTX2_CPT_DPTR_RPTR_ALIGN) + sg_len;
+	total_mem_len = ALIGN(total_mem_len, OTX2_CPT_DPTR_RPTR_ALIGN);
+	total_mem_len += (OTX2_CPT_RES_ADDR_ALIGN - 1) &
+			  ~(OTX2_CPT_DPTR_RPTR_ALIGN - 1);
+	total_mem_len += sizeof(union otx2_cpt_res_s);
 
 	info = kzalloc(total_mem_len, gfp);
 	if (unlikely(!info))
@@ -375,7 +400,9 @@ cn10k_sgv2_info_create(struct pci_dev *pdev, struct otx2_cpt_req_info *req,
 		dlen += req->in[i].size;
 
 	info->dlen = dlen;
-	info->in_buffer = (u8 *)info + info_len;
+	info->in_buffer = PTR_ALIGN((u8 *)info + info_len,
+				    OTX2_CPT_DPTR_RPTR_ALIGN);
+	info->out_buffer = info->in_buffer + g_len;
 	info->gthr_sz = req->in_cnt;
 	info->sctr_sz = req->out_cnt;
 
@@ -387,7 +414,7 @@ cn10k_sgv2_info_create(struct pci_dev *pdev, struct otx2_cpt_req_info *req,
 	}
 
 	if (sgv2io_components_setup(pdev, req->out, req->out_cnt,
-				    &info->in_buffer[g_len])) {
+				    info->out_buffer)) {
 		dev_err(&pdev->dev, "Failed to setup scatter list\n");
 		goto destroy_info;
 	}
@@ -404,8 +431,10 @@ cn10k_sgv2_info_create(struct pci_dev *pdev, struct otx2_cpt_req_info *req,
 	 * Get buffer for union otx2_cpt_res_s response
 	 * structure and its physical address
 	 */
-	info->completion_addr = info->in_buffer + sg_len;
-	info->comp_baddr = info->dptr_baddr + sg_len;
+	info->completion_addr = PTR_ALIGN((info->in_buffer + sg_len),
+					  OTX2_CPT_RES_ADDR_ALIGN);
+	info->comp_baddr = ALIGN((info->dptr_baddr + sg_len),
+				 OTX2_CPT_RES_ADDR_ALIGN);
 
 	return info;
 
-- 
2.34.1